v4.19.13 snapshot.
diff --git a/drivers/scsi/ibmvscsi/Makefile b/drivers/scsi/ibmvscsi/Makefile
new file mode 100644
index 0000000..3840c64
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_SCSI_IBMVSCSI) += ibmvscsi.o
+obj-$(CONFIG_SCSI_IBMVFC) += ibmvfc.o
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
new file mode 100644
index 0000000..b64ca97
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -0,0 +1,5019 @@
+/*
+ * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
+ *
+ * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
+ *
+ * Copyright (C) IBM Corporation, 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kthread.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/stringify.h>
+#include <linux/bsg-lib.h>
+#include <asm/firmware.h>
+#include <asm/irq.h>
+#include <asm/vio.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_transport_fc.h>
+#include <scsi/scsi_bsg_fc.h>
+#include "ibmvfc.h"
+
+static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
+static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
+static u64 max_lun = IBMVFC_MAX_LUN;
+static unsigned int max_targets = IBMVFC_MAX_TARGETS;
+static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
+static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
+static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
+static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
+static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
+static LIST_HEAD(ibmvfc_head);
+static DEFINE_SPINLOCK(ibmvfc_driver_lock);
+static struct scsi_transport_template *ibmvfc_transport_template;
+
+MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
+MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(IBMVFC_DRIVER_VERSION);
+
+module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
+ "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
+module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(default_timeout,
+ "Default timeout in seconds for initialization and EH commands. "
+ "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
+module_param_named(max_requests, max_requests, uint, S_IRUGO);
+MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
+ "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
+module_param_named(max_lun, max_lun, ullong, S_IRUGO);
+MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
+ "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
+module_param_named(max_targets, max_targets, uint, S_IRUGO);
+MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
+ "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
+module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
+MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
+ "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
+module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable driver debug information. "
+ "[Default=" __stringify(IBMVFC_DEBUG) "]");
+module_param_named(log_level, log_level, uint, 0);
+MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
+ "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
+module_param_named(cls3_error, cls3_error, uint, 0);
+MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
+ "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
+
+static const struct {
+ u16 status;
+ u16 error;
+ u8 result;
+ u8 retry;
+ int log;
+ char *name;
+} cmd_status [] = {
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
+ { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
+
+ { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
+ { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
+ { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
+ { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
+ { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
+ { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
+ { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
+ { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
+ { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
+ { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
+
+ { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
+ { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
+ { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
+ { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
+ { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
+ { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
+ { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
+ { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
+ { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
+ { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
+ { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
+
+ { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
+};
+
+static void ibmvfc_npiv_login(struct ibmvfc_host *);
+static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
+static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
+static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
+static void ibmvfc_npiv_logout(struct ibmvfc_host *);
+
+static const char *unknown_error = "unknown error";
+
+#ifdef CONFIG_SCSI_IBMVFC_TRACE
+/**
+ * ibmvfc_trc_start - Log a start trace entry
+ * @evt: ibmvfc event struct
+ *
+ **/
+static void ibmvfc_trc_start(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_host *vhost = evt->vhost;
+ struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
+ struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
+ struct ibmvfc_trace_entry *entry;
+
+ entry = &vhost->trace[vhost->trace_index++];
+ entry->evt = evt;
+ entry->time = jiffies;
+ entry->fmt = evt->crq.format;
+ entry->type = IBMVFC_TRC_START;
+
+ switch (entry->fmt) {
+ case IBMVFC_CMD_FORMAT:
+ entry->op_code = vfc_cmd->iu.cdb[0];
+ entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
+ entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
+ entry->tmf_flags = vfc_cmd->iu.tmf_flags;
+ entry->u.start.xfer_len = be32_to_cpu(vfc_cmd->iu.xfer_len);
+ break;
+ case IBMVFC_MAD_FORMAT:
+ entry->op_code = be32_to_cpu(mad->opcode);
+ break;
+ default:
+ break;
+ }
+}
+
+/**
+ * ibmvfc_trc_end - Log an end trace entry
+ * @evt: ibmvfc event struct
+ *
+ **/
+static void ibmvfc_trc_end(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_host *vhost = evt->vhost;
+ struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
+ struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
+ struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
+
+ entry->evt = evt;
+ entry->time = jiffies;
+ entry->fmt = evt->crq.format;
+ entry->type = IBMVFC_TRC_END;
+
+ switch (entry->fmt) {
+ case IBMVFC_CMD_FORMAT:
+ entry->op_code = vfc_cmd->iu.cdb[0];
+ entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
+ entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
+ entry->tmf_flags = vfc_cmd->iu.tmf_flags;
+ entry->u.end.status = be16_to_cpu(vfc_cmd->status);
+ entry->u.end.error = be16_to_cpu(vfc_cmd->error);
+ entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
+ entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
+ entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
+ break;
+ case IBMVFC_MAD_FORMAT:
+ entry->op_code = be32_to_cpu(mad->opcode);
+ entry->u.end.status = be16_to_cpu(mad->status);
+ break;
+ default:
+ break;
+
+ }
+}
+
+#else
+#define ibmvfc_trc_start(evt) do { } while (0)
+#define ibmvfc_trc_end(evt) do { } while (0)
+#endif
+
+/**
+ * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
+ * @status: status / error class
+ * @error: error
+ *
+ * Return value:
+ * index into cmd_status / -EINVAL on failure
+ **/
+static int ibmvfc_get_err_index(u16 status, u16 error)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
+ if ((cmd_status[i].status & status) == cmd_status[i].status &&
+ cmd_status[i].error == error)
+ return i;
+
+ return -EINVAL;
+}
+
+/**
+ * ibmvfc_get_cmd_error - Find the error description for the fcp response
+ * @status: status / error class
+ * @error: error
+ *
+ * Return value:
+ * error description string
+ **/
+static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
+{
+ int rc = ibmvfc_get_err_index(status, error);
+ if (rc >= 0)
+ return cmd_status[rc].name;
+ return unknown_error;
+}
+
+/**
+ * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
+ * @vfc_cmd: ibmvfc command struct
+ *
+ * Return value:
+ * SCSI result value to return for completed command
+ **/
+static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
+{
+ int err;
+ struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
+ int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
+
+ if ((rsp->flags & FCP_RSP_LEN_VALID) &&
+ ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
+ rsp->data.info.rsp_code))
+ return DID_ERROR << 16;
+
+ err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
+ if (err >= 0)
+ return rsp->scsi_status | (cmd_status[err].result << 16);
+ return rsp->scsi_status | (DID_ERROR << 16);
+}
+
+/**
+ * ibmvfc_retry_cmd - Determine if error status is retryable
+ * @status: status / error class
+ * @error: error
+ *
+ * Return value:
+ * 1 if error should be retried / 0 if it should not
+ **/
+static int ibmvfc_retry_cmd(u16 status, u16 error)
+{
+ int rc = ibmvfc_get_err_index(status, error);
+
+ if (rc >= 0)
+ return cmd_status[rc].retry;
+ return 1;
+}
+
+static const char *unknown_fc_explain = "unknown fc explain";
+
+static const struct {
+ u16 fc_explain;
+ char *name;
+} ls_explain [] = {
+ { 0x00, "no additional explanation" },
+ { 0x01, "service parameter error - options" },
+ { 0x03, "service parameter error - initiator control" },
+ { 0x05, "service parameter error - recipient control" },
+ { 0x07, "service parameter error - received data field size" },
+ { 0x09, "service parameter error - concurrent seq" },
+ { 0x0B, "service parameter error - credit" },
+ { 0x0D, "invalid N_Port/F_Port_Name" },
+ { 0x0E, "invalid node/Fabric Name" },
+ { 0x0F, "invalid common service parameters" },
+ { 0x11, "invalid association header" },
+ { 0x13, "association header required" },
+ { 0x15, "invalid originator S_ID" },
+ { 0x17, "invalid OX_ID-RX-ID combination" },
+ { 0x19, "command (request) already in progress" },
+ { 0x1E, "N_Port Login requested" },
+ { 0x1F, "Invalid N_Port_ID" },
+};
+
+static const struct {
+ u16 fc_explain;
+ char *name;
+} gs_explain [] = {
+ { 0x00, "no additional explanation" },
+ { 0x01, "port identifier not registered" },
+ { 0x02, "port name not registered" },
+ { 0x03, "node name not registered" },
+ { 0x04, "class of service not registered" },
+ { 0x06, "initial process associator not registered" },
+ { 0x07, "FC-4 TYPEs not registered" },
+ { 0x08, "symbolic port name not registered" },
+ { 0x09, "symbolic node name not registered" },
+ { 0x0A, "port type not registered" },
+ { 0xF0, "authorization exception" },
+ { 0xF1, "authentication exception" },
+ { 0xF2, "data base full" },
+ { 0xF3, "data base empty" },
+ { 0xF4, "processing request" },
+ { 0xF5, "unable to verify connection" },
+ { 0xF6, "devices not in a common zone" },
+};
+
+/**
+ * ibmvfc_get_ls_explain - Return the FC Explain description text
+ * @status: FC Explain status
+ *
+ * Returns:
+ * error string
+ **/
+static const char *ibmvfc_get_ls_explain(u16 status)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
+ if (ls_explain[i].fc_explain == status)
+ return ls_explain[i].name;
+
+ return unknown_fc_explain;
+}
+
+/**
+ * ibmvfc_get_gs_explain - Return the FC Explain description text
+ * @status: FC Explain status
+ *
+ * Returns:
+ * error string
+ **/
+static const char *ibmvfc_get_gs_explain(u16 status)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
+ if (gs_explain[i].fc_explain == status)
+ return gs_explain[i].name;
+
+ return unknown_fc_explain;
+}
+
+static const struct {
+ enum ibmvfc_fc_type fc_type;
+ char *name;
+} fc_type [] = {
+ { IBMVFC_FABRIC_REJECT, "fabric reject" },
+ { IBMVFC_PORT_REJECT, "port reject" },
+ { IBMVFC_LS_REJECT, "ELS reject" },
+ { IBMVFC_FABRIC_BUSY, "fabric busy" },
+ { IBMVFC_PORT_BUSY, "port busy" },
+ { IBMVFC_BASIC_REJECT, "basic reject" },
+};
+
+static const char *unknown_fc_type = "unknown fc type";
+
+/**
+ * ibmvfc_get_fc_type - Return the FC Type description text
+ * @status: FC Type error status
+ *
+ * Returns:
+ * error string
+ **/
+static const char *ibmvfc_get_fc_type(u16 status)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(fc_type); i++)
+ if (fc_type[i].fc_type == status)
+ return fc_type[i].name;
+
+ return unknown_fc_type;
+}
+
+/**
+ * ibmvfc_set_tgt_action - Set the next init action for the target
+ * @tgt: ibmvfc target struct
+ * @action: action to perform
+ *
+ **/
+static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
+ enum ibmvfc_target_action action)
+{
+ switch (tgt->action) {
+ case IBMVFC_TGT_ACTION_DEL_RPORT:
+ if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
+ tgt->action = action;
+ case IBMVFC_TGT_ACTION_DELETED_RPORT:
+ break;
+ default:
+ if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
+ tgt->add_rport = 0;
+ tgt->action = action;
+ break;
+ }
+}
+
+/**
+ * ibmvfc_set_host_state - Set the state for the host
+ * @vhost: ibmvfc host struct
+ * @state: state to set host to
+ *
+ * Returns:
+ * 0 if state changed / non-zero if not changed
+ **/
+static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
+ enum ibmvfc_host_state state)
+{
+ int rc = 0;
+
+ switch (vhost->state) {
+ case IBMVFC_HOST_OFFLINE:
+ rc = -EINVAL;
+ break;
+ default:
+ vhost->state = state;
+ break;
+ }
+
+ return rc;
+}
+
+/**
+ * ibmvfc_set_host_action - Set the next init action for the host
+ * @vhost: ibmvfc host struct
+ * @action: action to perform
+ *
+ **/
+static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
+ enum ibmvfc_host_action action)
+{
+ switch (action) {
+ case IBMVFC_HOST_ACTION_ALLOC_TGTS:
+ if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
+ vhost->action = action;
+ break;
+ case IBMVFC_HOST_ACTION_LOGO_WAIT:
+ if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
+ vhost->action = action;
+ break;
+ case IBMVFC_HOST_ACTION_INIT_WAIT:
+ if (vhost->action == IBMVFC_HOST_ACTION_INIT)
+ vhost->action = action;
+ break;
+ case IBMVFC_HOST_ACTION_QUERY:
+ switch (vhost->action) {
+ case IBMVFC_HOST_ACTION_INIT_WAIT:
+ case IBMVFC_HOST_ACTION_NONE:
+ case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
+ vhost->action = action;
+ break;
+ default:
+ break;
+ }
+ break;
+ case IBMVFC_HOST_ACTION_TGT_INIT:
+ if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
+ vhost->action = action;
+ break;
+ case IBMVFC_HOST_ACTION_INIT:
+ case IBMVFC_HOST_ACTION_TGT_DEL:
+ switch (vhost->action) {
+ case IBMVFC_HOST_ACTION_RESET:
+ case IBMVFC_HOST_ACTION_REENABLE:
+ break;
+ default:
+ vhost->action = action;
+ break;
+ }
+ break;
+ case IBMVFC_HOST_ACTION_LOGO:
+ case IBMVFC_HOST_ACTION_QUERY_TGTS:
+ case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
+ case IBMVFC_HOST_ACTION_NONE:
+ case IBMVFC_HOST_ACTION_RESET:
+ case IBMVFC_HOST_ACTION_REENABLE:
+ default:
+ vhost->action = action;
+ break;
+ }
+}
+
+/**
+ * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
+ * @vhost: ibmvfc host struct
+ *
+ * Return value:
+ * nothing
+ **/
+static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
+{
+ if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
+ if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
+ scsi_block_requests(vhost->host);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
+ }
+ } else
+ vhost->reinit = 1;
+
+ wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_link_down - Handle a link down event from the adapter
+ * @vhost: ibmvfc host struct
+ * @state: ibmvfc host state to enter
+ *
+ **/
+static void ibmvfc_link_down(struct ibmvfc_host *vhost,
+ enum ibmvfc_host_state state)
+{
+ struct ibmvfc_target *tgt;
+
+ ENTER;
+ scsi_block_requests(vhost->host);
+ list_for_each_entry(tgt, &vhost->targets, queue)
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ ibmvfc_set_host_state(vhost, state);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
+ vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
+ wake_up(&vhost->work_wait_q);
+ LEAVE;
+}
+
+/**
+ * ibmvfc_init_host - Start host initialization
+ * @vhost: ibmvfc host struct
+ *
+ * Return value:
+ * nothing
+ **/
+static void ibmvfc_init_host(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_target *tgt;
+
+ if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
+ if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
+ dev_err(vhost->dev,
+ "Host initialization retries exceeded. Taking adapter offline\n");
+ ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
+ return;
+ }
+ }
+
+ if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
+ memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
+ vhost->async_crq.cur = 0;
+
+ list_for_each_entry(tgt, &vhost->targets, queue)
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ scsi_block_requests(vhost->host);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
+ vhost->job_step = ibmvfc_npiv_login;
+ wake_up(&vhost->work_wait_q);
+ }
+}
+
+/**
+ * ibmvfc_send_crq - Send a CRQ
+ * @vhost: ibmvfc host struct
+ * @word1: the first 64 bits of the data
+ * @word2: the second 64 bits of the data
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
+{
+ struct vio_dev *vdev = to_vio_dev(vhost->dev);
+ return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
+}
+
+/**
+ * ibmvfc_send_crq_init - Send a CRQ init message
+ * @vhost: ibmvfc host struct
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
+{
+ ibmvfc_dbg(vhost, "Sending CRQ init\n");
+ return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
+}
+
+/**
+ * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
+ * @vhost: ibmvfc host struct
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
+{
+ ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
+ return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
+}
+
+/**
+ * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
+ * @vhost: ibmvfc host struct
+ *
+ * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
+ * the crq with the hypervisor.
+ **/
+static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
+{
+ long rc = 0;
+ struct vio_dev *vdev = to_vio_dev(vhost->dev);
+ struct ibmvfc_crq_queue *crq = &vhost->crq;
+
+ ibmvfc_dbg(vhost, "Releasing CRQ\n");
+ free_irq(vdev->irq, vhost);
+ tasklet_kill(&vhost->tasklet);
+ do {
+ if (rc)
+ msleep(100);
+ rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
+ } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
+
+ vhost->state = IBMVFC_NO_CRQ;
+ vhost->logged_in = 0;
+ dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
+ free_page((unsigned long)crq->msgs);
+}
+
+/**
+ * ibmvfc_reenable_crq_queue - reenables the CRQ
+ * @vhost: ibmvfc host struct
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
+{
+ int rc = 0;
+ struct vio_dev *vdev = to_vio_dev(vhost->dev);
+
+ /* Re-enable the CRQ */
+ do {
+ if (rc)
+ msleep(100);
+ rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
+ } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
+
+ if (rc)
+ dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
+
+ return rc;
+}
+
+/**
+ * ibmvfc_reset_crq - resets a crq after a failure
+ * @vhost: ibmvfc host struct
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
+{
+ int rc = 0;
+ unsigned long flags;
+ struct vio_dev *vdev = to_vio_dev(vhost->dev);
+ struct ibmvfc_crq_queue *crq = &vhost->crq;
+
+ /* Close the CRQ */
+ do {
+ if (rc)
+ msleep(100);
+ rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
+ } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ vhost->state = IBMVFC_NO_CRQ;
+ vhost->logged_in = 0;
+
+ /* Clean out the queue */
+ memset(crq->msgs, 0, PAGE_SIZE);
+ crq->cur = 0;
+
+ /* And re-open it again */
+ rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
+ crq->msg_token, PAGE_SIZE);
+
+ if (rc == H_CLOSED)
+ /* Adapter is good, but other end is not ready */
+ dev_warn(vhost->dev, "Partner adapter not ready\n");
+ else if (rc != 0)
+ dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ return rc;
+}
+
+/**
+ * ibmvfc_valid_event - Determines if event is valid.
+ * @pool: event_pool that contains the event
+ * @evt: ibmvfc event to be checked for validity
+ *
+ * Return value:
+ * 1 if event is valid / 0 if event is not valid
+ **/
+static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
+ struct ibmvfc_event *evt)
+{
+ int index = evt - pool->events;
+ if (index < 0 || index >= pool->size) /* outside of bounds */
+ return 0;
+ if (evt != pool->events + index) /* unaligned */
+ return 0;
+ return 1;
+}
+
+/**
+ * ibmvfc_free_event - Free the specified event
+ * @evt: ibmvfc_event to be freed
+ *
+ **/
+static void ibmvfc_free_event(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_host *vhost = evt->vhost;
+ struct ibmvfc_event_pool *pool = &vhost->pool;
+
+ BUG_ON(!ibmvfc_valid_event(pool, evt));
+ BUG_ON(atomic_inc_return(&evt->free) != 1);
+ list_add_tail(&evt->queue, &vhost->free);
+}
+
+/**
+ * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
+ * @evt: ibmvfc event struct
+ *
+ * This function does not setup any error status, that must be done
+ * before this function gets called.
+ **/
+static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
+{
+ struct scsi_cmnd *cmnd = evt->cmnd;
+
+ if (cmnd) {
+ scsi_dma_unmap(cmnd);
+ cmnd->scsi_done(cmnd);
+ }
+
+ if (evt->eh_comp)
+ complete(evt->eh_comp);
+
+ ibmvfc_free_event(evt);
+}
+
+/**
+ * ibmvfc_fail_request - Fail request with specified error code
+ * @evt: ibmvfc event struct
+ * @error_code: error code to fail request with
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
+{
+ if (evt->cmnd) {
+ evt->cmnd->result = (error_code << 16);
+ evt->done = ibmvfc_scsi_eh_done;
+ } else
+ evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
+
+ list_del(&evt->queue);
+ del_timer(&evt->timer);
+ ibmvfc_trc_end(evt);
+ evt->done(evt);
+}
+
+/**
+ * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
+ * @vhost: ibmvfc host struct
+ * @error_code: error code to fail requests with
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
+{
+ struct ibmvfc_event *evt, *pos;
+
+ ibmvfc_dbg(vhost, "Purging all requests\n");
+ list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
+ ibmvfc_fail_request(evt, error_code);
+}
+
+/**
+ * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
+ * @vhost: struct ibmvfc host to reset
+ **/
+static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
+{
+ ibmvfc_purge_requests(vhost, DID_ERROR);
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
+}
+
+/**
+ * __ibmvfc_reset_host - Reset the connection to the server (no locking)
+ * @vhost: struct ibmvfc host to reset
+ **/
+static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
+{
+ if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
+ !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
+ scsi_block_requests(vhost->host);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
+ vhost->job_step = ibmvfc_npiv_logout;
+ wake_up(&vhost->work_wait_q);
+ } else
+ ibmvfc_hard_reset_host(vhost);
+}
+
+/**
+ * ibmvfc_reset_host - Reset the connection to the server
+ * @vhost: ibmvfc host struct
+ **/
+static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ __ibmvfc_reset_host(vhost);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+}
+
+/**
+ * ibmvfc_retry_host_init - Retry host initialization if allowed
+ * @vhost: ibmvfc host struct
+ *
+ * Returns: 1 if init will be retried / 0 if not
+ *
+ **/
+static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
+{
+ int retry = 0;
+
+ if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
+ vhost->delay_init = 1;
+ if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
+ dev_err(vhost->dev,
+ "Host initialization retries exceeded. Taking adapter offline\n");
+ ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
+ } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
+ __ibmvfc_reset_host(vhost);
+ else {
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
+ retry = 1;
+ }
+ }
+
+ wake_up(&vhost->work_wait_q);
+ return retry;
+}
+
+/**
+ * __ibmvfc_get_target - Find the specified scsi_target (no locking)
+ * @starget: scsi target struct
+ *
+ * Return value:
+ * ibmvfc_target struct / NULL if not found
+ **/
+static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
+{
+ struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ struct ibmvfc_target *tgt;
+
+ list_for_each_entry(tgt, &vhost->targets, queue)
+ if (tgt->target_id == starget->id) {
+ kref_get(&tgt->kref);
+ return tgt;
+ }
+ return NULL;
+}
+
+/**
+ * ibmvfc_get_target - Find the specified scsi_target
+ * @starget: scsi target struct
+ *
+ * Return value:
+ * ibmvfc_target struct / NULL if not found
+ **/
+static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
+{
+ struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+ struct ibmvfc_target *tgt;
+ unsigned long flags;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ tgt = __ibmvfc_get_target(starget);
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ return tgt;
+}
+
+/**
+ * ibmvfc_get_host_speed - Get host port speed
+ * @shost: scsi host struct
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
+{
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ unsigned long flags;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ if (vhost->state == IBMVFC_ACTIVE) {
+ switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
+ case 1:
+ fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
+ break;
+ case 2:
+ fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
+ break;
+ case 4:
+ fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
+ break;
+ case 8:
+ fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
+ break;
+ case 10:
+ fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
+ break;
+ case 16:
+ fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
+ break;
+ default:
+ ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
+ be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
+ fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
+ break;
+ }
+ } else
+ fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
+ spin_unlock_irqrestore(shost->host_lock, flags);
+}
+
+/**
+ * ibmvfc_get_host_port_state - Get host port state
+ * @shost: scsi host struct
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
+{
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ unsigned long flags;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ switch (vhost->state) {
+ case IBMVFC_INITIALIZING:
+ case IBMVFC_ACTIVE:
+ fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
+ break;
+ case IBMVFC_LINK_DOWN:
+ fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
+ break;
+ case IBMVFC_LINK_DEAD:
+ case IBMVFC_HOST_OFFLINE:
+ fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
+ break;
+ case IBMVFC_HALTED:
+ fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
+ break;
+ case IBMVFC_NO_CRQ:
+ fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
+ break;
+ default:
+ ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
+ fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
+ break;
+ }
+ spin_unlock_irqrestore(shost->host_lock, flags);
+}
+
+/**
+ * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
+ * @rport: rport struct
+ * @timeout: timeout value
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
+{
+ if (timeout)
+ rport->dev_loss_tmo = timeout;
+ else
+ rport->dev_loss_tmo = 1;
+}
+
+/**
+ * ibmvfc_release_tgt - Free memory allocated for a target
+ * @kref: kref struct
+ *
+ **/
+static void ibmvfc_release_tgt(struct kref *kref)
+{
+ struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
+ kfree(tgt);
+}
+
+/**
+ * ibmvfc_get_starget_node_name - Get SCSI target's node name
+ * @starget: scsi target struct
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
+{
+ struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
+ fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
+ if (tgt)
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+}
+
+/**
+ * ibmvfc_get_starget_port_name - Get SCSI target's port name
+ * @starget: scsi target struct
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
+{
+ struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
+ fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
+ if (tgt)
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+}
+
+/**
+ * ibmvfc_get_starget_port_id - Get SCSI target's port ID
+ * @starget: scsi target struct
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
+{
+ struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
+ fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
+ if (tgt)
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+}
+
+/**
+ * ibmvfc_wait_while_resetting - Wait while the host resets
+ * @vhost: ibmvfc host struct
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
+{
+ long timeout = wait_event_timeout(vhost->init_wait_q,
+ ((vhost->state == IBMVFC_ACTIVE ||
+ vhost->state == IBMVFC_HOST_OFFLINE ||
+ vhost->state == IBMVFC_LINK_DEAD) &&
+ vhost->action == IBMVFC_HOST_ACTION_NONE),
+ (init_timeout * HZ));
+
+ return timeout ? 0 : -EIO;
+}
+
+/**
+ * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
+ * @shost: scsi host struct
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
+{
+ struct ibmvfc_host *vhost = shost_priv(shost);
+
+ dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
+ ibmvfc_reset_host(vhost);
+ return ibmvfc_wait_while_resetting(vhost);
+}
+
+/**
+ * ibmvfc_gather_partition_info - Gather info about the LPAR
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
+{
+ struct device_node *rootdn;
+ const char *name;
+ const unsigned int *num;
+
+ rootdn = of_find_node_by_path("/");
+ if (!rootdn)
+ return;
+
+ name = of_get_property(rootdn, "ibm,partition-name", NULL);
+ if (name)
+ strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
+ num = of_get_property(rootdn, "ibm,partition-no", NULL);
+ if (num)
+ vhost->partition_number = *num;
+ of_node_put(rootdn);
+}
+
+/**
+ * ibmvfc_set_login_info - Setup info for NPIV login
+ * @vhost: ibmvfc host struct
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_npiv_login *login_info = &vhost->login_info;
+ struct device_node *of_node = vhost->dev->of_node;
+ const char *location;
+
+ memset(login_info, 0, sizeof(*login_info));
+
+ login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
+ login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
+ login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
+ login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
+ login_info->partition_num = cpu_to_be32(vhost->partition_number);
+ login_info->vfc_frame_version = cpu_to_be32(1);
+ login_info->fcp_version = cpu_to_be16(3);
+ login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
+ if (vhost->client_migrated)
+ login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
+
+ login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
+ login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE);
+ login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
+ login_info->async.len = cpu_to_be32(vhost->async_crq.size * sizeof(*vhost->async_crq.msgs));
+ strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
+ strncpy(login_info->device_name,
+ dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
+
+ location = of_get_property(of_node, "ibm,loc-code", NULL);
+ location = location ? location : dev_name(vhost->dev);
+ strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
+}
+
+/**
+ * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
+ * @vhost: ibmvfc host who owns the event pool
+ *
+ * Returns zero on success.
+ **/
+static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
+{
+ int i;
+ struct ibmvfc_event_pool *pool = &vhost->pool;
+
+ ENTER;
+ pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
+ pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
+ if (!pool->events)
+ return -ENOMEM;
+
+ pool->iu_storage = dma_alloc_coherent(vhost->dev,
+ pool->size * sizeof(*pool->iu_storage),
+ &pool->iu_token, 0);
+
+ if (!pool->iu_storage) {
+ kfree(pool->events);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < pool->size; ++i) {
+ struct ibmvfc_event *evt = &pool->events[i];
+ atomic_set(&evt->free, 1);
+ evt->crq.valid = 0x80;
+ evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
+ evt->xfer_iu = pool->iu_storage + i;
+ evt->vhost = vhost;
+ evt->ext_list = NULL;
+ list_add_tail(&evt->queue, &vhost->free);
+ }
+
+ LEAVE;
+ return 0;
+}
+
+/**
+ * ibmvfc_free_event_pool - Frees memory of the event pool of a host
+ * @vhost: ibmvfc host who owns the event pool
+ *
+ **/
+static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
+{
+ int i;
+ struct ibmvfc_event_pool *pool = &vhost->pool;
+
+ ENTER;
+ for (i = 0; i < pool->size; ++i) {
+ list_del(&pool->events[i].queue);
+ BUG_ON(atomic_read(&pool->events[i].free) != 1);
+ if (pool->events[i].ext_list)
+ dma_pool_free(vhost->sg_pool,
+ pool->events[i].ext_list,
+ pool->events[i].ext_list_token);
+ }
+
+ kfree(pool->events);
+ dma_free_coherent(vhost->dev,
+ pool->size * sizeof(*pool->iu_storage),
+ pool->iu_storage, pool->iu_token);
+ LEAVE;
+}
+
+/**
+ * ibmvfc_get_event - Gets the next free event in pool
+ * @vhost: ibmvfc host struct
+ *
+ * Returns a free event from the pool.
+ **/
+static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_event *evt;
+
+ BUG_ON(list_empty(&vhost->free));
+ evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
+ atomic_set(&evt->free, 0);
+ list_del(&evt->queue);
+ return evt;
+}
+
+/**
+ * ibmvfc_init_event - Initialize fields in an event struct that are always
+ * required.
+ * @evt: The event
+ * @done: Routine to call when the event is responded to
+ * @format: SRP or MAD format
+ **/
+static void ibmvfc_init_event(struct ibmvfc_event *evt,
+ void (*done) (struct ibmvfc_event *), u8 format)
+{
+ evt->cmnd = NULL;
+ evt->sync_iu = NULL;
+ evt->crq.format = format;
+ evt->done = done;
+ evt->eh_comp = NULL;
+}
+
+/**
+ * ibmvfc_map_sg_list - Initialize scatterlist
+ * @scmd: scsi command struct
+ * @nseg: number of scatterlist segments
+ * @md: memory descriptor list to initialize
+ **/
+static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
+ struct srp_direct_buf *md)
+{
+ int i;
+ struct scatterlist *sg;
+
+ scsi_for_each_sg(scmd, sg, nseg, i) {
+ md[i].va = cpu_to_be64(sg_dma_address(sg));
+ md[i].len = cpu_to_be32(sg_dma_len(sg));
+ md[i].key = 0;
+ }
+}
+
+/**
+ * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
+ * @scmd: struct scsi_cmnd with the scatterlist
+ * @evt: ibmvfc event struct
+ * @vfc_cmd: vfc_cmd that contains the memory descriptor
+ * @dev: device for which to map dma memory
+ *
+ * Returns:
+ * 0 on success / non-zero on failure
+ **/
+static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
+ struct ibmvfc_event *evt,
+ struct ibmvfc_cmd *vfc_cmd, struct device *dev)
+{
+
+ int sg_mapped;
+ struct srp_direct_buf *data = &vfc_cmd->ioba;
+ struct ibmvfc_host *vhost = dev_get_drvdata(dev);
+
+ if (cls3_error)
+ vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
+
+ sg_mapped = scsi_dma_map(scmd);
+ if (!sg_mapped) {
+ vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
+ return 0;
+ } else if (unlikely(sg_mapped < 0)) {
+ if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
+ scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
+ return sg_mapped;
+ }
+
+ if (scmd->sc_data_direction == DMA_TO_DEVICE) {
+ vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
+ vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
+ } else {
+ vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
+ vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
+ }
+
+ if (sg_mapped == 1) {
+ ibmvfc_map_sg_list(scmd, sg_mapped, data);
+ return 0;
+ }
+
+ vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
+
+ if (!evt->ext_list) {
+ evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
+ &evt->ext_list_token);
+
+ if (!evt->ext_list) {
+ scsi_dma_unmap(scmd);
+ if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
+ scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
+ return -ENOMEM;
+ }
+ }
+
+ ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
+
+ data->va = cpu_to_be64(evt->ext_list_token);
+ data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
+ data->key = 0;
+ return 0;
+}
+
+/**
+ * ibmvfc_timeout - Internal command timeout handler
+ * @evt: struct ibmvfc_event that timed out
+ *
+ * Called when an internally generated command times out
+ **/
+static void ibmvfc_timeout(struct timer_list *t)
+{
+ struct ibmvfc_event *evt = from_timer(evt, t, timer);
+ struct ibmvfc_host *vhost = evt->vhost;
+ dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
+ ibmvfc_reset_host(vhost);
+}
+
+/**
+ * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
+ * @evt: event to be sent
+ * @vhost: ibmvfc host struct
+ * @timeout: timeout in seconds - 0 means do not time command
+ *
+ * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
+ **/
+static int ibmvfc_send_event(struct ibmvfc_event *evt,
+ struct ibmvfc_host *vhost, unsigned long timeout)
+{
+ __be64 *crq_as_u64 = (__be64 *) &evt->crq;
+ int rc;
+
+ /* Copy the IU into the transfer area */
+ *evt->xfer_iu = evt->iu;
+ if (evt->crq.format == IBMVFC_CMD_FORMAT)
+ evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
+ else if (evt->crq.format == IBMVFC_MAD_FORMAT)
+ evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
+ else
+ BUG();
+
+ list_add_tail(&evt->queue, &vhost->sent);
+ timer_setup(&evt->timer, ibmvfc_timeout, 0);
+
+ if (timeout) {
+ evt->timer.expires = jiffies + (timeout * HZ);
+ add_timer(&evt->timer);
+ }
+
+ mb();
+
+ if ((rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
+ be64_to_cpu(crq_as_u64[1])))) {
+ list_del(&evt->queue);
+ del_timer(&evt->timer);
+
+ /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
+ * Firmware will send a CRQ with a transport event (0xFF) to
+ * tell this client what has happened to the transport. This
+ * will be handled in ibmvfc_handle_crq()
+ */
+ if (rc == H_CLOSED) {
+ if (printk_ratelimit())
+ dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
+ if (evt->cmnd)
+ scsi_dma_unmap(evt->cmnd);
+ ibmvfc_free_event(evt);
+ return SCSI_MLQUEUE_HOST_BUSY;
+ }
+
+ dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
+ if (evt->cmnd) {
+ evt->cmnd->result = DID_ERROR << 16;
+ evt->done = ibmvfc_scsi_eh_done;
+ } else
+ evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
+
+ evt->done(evt);
+ } else
+ ibmvfc_trc_start(evt);
+
+ return 0;
+}
+
+/**
+ * ibmvfc_log_error - Log an error for the failed command if appropriate
+ * @evt: ibmvfc event to log
+ *
+ **/
+static void ibmvfc_log_error(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
+ struct ibmvfc_host *vhost = evt->vhost;
+ struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
+ struct scsi_cmnd *cmnd = evt->cmnd;
+ const char *err = unknown_error;
+ int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
+ int logerr = 0;
+ int rsp_code = 0;
+
+ if (index >= 0) {
+ logerr = cmd_status[index].log;
+ err = cmd_status[index].name;
+ }
+
+ if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
+ return;
+
+ if (rsp->flags & FCP_RSP_LEN_VALID)
+ rsp_code = rsp->data.info.rsp_code;
+
+ scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
+ "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
+ cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
+ rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
+}
+
+/**
+ * ibmvfc_relogin - Log back into the specified device
+ * @sdev: scsi device struct
+ *
+ **/
+static void ibmvfc_relogin(struct scsi_device *sdev)
+{
+ struct ibmvfc_host *vhost = shost_priv(sdev->host);
+ struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+ struct ibmvfc_target *tgt;
+
+ list_for_each_entry(tgt, &vhost->targets, queue) {
+ if (rport == tgt->rport) {
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ break;
+ }
+ }
+
+ ibmvfc_reinit_host(vhost);
+}
+
+/**
+ * ibmvfc_scsi_done - Handle responses from commands
+ * @evt: ibmvfc event to be handled
+ *
+ * Used as a callback when sending scsi cmds.
+ **/
+static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
+ struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
+ struct scsi_cmnd *cmnd = evt->cmnd;
+ u32 rsp_len = 0;
+ u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
+
+ if (cmnd) {
+ if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
+ scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
+ else if (rsp->flags & FCP_RESID_UNDER)
+ scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
+ else
+ scsi_set_resid(cmnd, 0);
+
+ if (vfc_cmd->status) {
+ cmnd->result = ibmvfc_get_err_result(vfc_cmd);
+
+ if (rsp->flags & FCP_RSP_LEN_VALID)
+ rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
+ if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
+ sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
+ if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
+ memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
+ if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
+ (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
+ ibmvfc_relogin(cmnd->device);
+
+ if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
+ cmnd->result = (DID_ERROR << 16);
+
+ ibmvfc_log_error(evt);
+ }
+
+ if (!cmnd->result &&
+ (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
+ cmnd->result = (DID_ERROR << 16);
+
+ scsi_dma_unmap(cmnd);
+ cmnd->scsi_done(cmnd);
+ }
+
+ if (evt->eh_comp)
+ complete(evt->eh_comp);
+
+ ibmvfc_free_event(evt);
+}
+
+/**
+ * ibmvfc_host_chkready - Check if the host can accept commands
+ * @vhost: struct ibmvfc host
+ *
+ * Returns:
+ * 1 if host can accept command / 0 if not
+ **/
+static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
+{
+ int result = 0;
+
+ switch (vhost->state) {
+ case IBMVFC_LINK_DEAD:
+ case IBMVFC_HOST_OFFLINE:
+ result = DID_NO_CONNECT << 16;
+ break;
+ case IBMVFC_NO_CRQ:
+ case IBMVFC_INITIALIZING:
+ case IBMVFC_HALTED:
+ case IBMVFC_LINK_DOWN:
+ result = DID_REQUEUE << 16;
+ break;
+ case IBMVFC_ACTIVE:
+ result = 0;
+ break;
+ }
+
+ return result;
+}
+
+/**
+ * ibmvfc_queuecommand - The queuecommand function of the scsi template
+ * @cmnd: struct scsi_cmnd to be executed
+ * @done: Callback function to be called when cmnd is completed
+ *
+ * Returns:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
+ void (*done) (struct scsi_cmnd *))
+{
+ struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
+ struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
+ struct ibmvfc_cmd *vfc_cmd;
+ struct ibmvfc_event *evt;
+ int rc;
+
+ if (unlikely((rc = fc_remote_port_chkready(rport))) ||
+ unlikely((rc = ibmvfc_host_chkready(vhost)))) {
+ cmnd->result = rc;
+ done(cmnd);
+ return 0;
+ }
+
+ cmnd->result = (DID_OK << 16);
+ evt = ibmvfc_get_event(vhost);
+ ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
+ evt->cmnd = cmnd;
+ cmnd->scsi_done = done;
+ vfc_cmd = &evt->iu.cmd;
+ memset(vfc_cmd, 0, sizeof(*vfc_cmd));
+ vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
+ vfc_cmd->resp.len = cpu_to_be32(sizeof(vfc_cmd->rsp));
+ vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
+ vfc_cmd->payload_len = cpu_to_be32(sizeof(vfc_cmd->iu));
+ vfc_cmd->resp_len = cpu_to_be32(sizeof(vfc_cmd->rsp));
+ vfc_cmd->cancel_key = cpu_to_be32((unsigned long)cmnd->device->hostdata);
+ vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
+ vfc_cmd->iu.xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
+ int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
+ memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
+
+ if (cmnd->flags & SCMD_TAGGED) {
+ vfc_cmd->task_tag = cpu_to_be64(cmnd->tag);
+ vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
+ }
+
+ if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
+ return ibmvfc_send_event(evt, vhost, 0);
+
+ ibmvfc_free_event(evt);
+ if (rc == -ENOMEM)
+ return SCSI_MLQUEUE_HOST_BUSY;
+
+ if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
+ scmd_printk(KERN_ERR, cmnd,
+ "Failed to map DMA buffer for command. rc=%d\n", rc);
+
+ cmnd->result = DID_ERROR << 16;
+ done(cmnd);
+ return 0;
+}
+
+static DEF_SCSI_QCMD(ibmvfc_queuecommand)
+
+/**
+ * ibmvfc_sync_completion - Signal that a synchronous command has completed
+ * @evt: ibmvfc event struct
+ *
+ **/
+static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
+{
+ /* copy the response back */
+ if (evt->sync_iu)
+ *evt->sync_iu = *evt->xfer_iu;
+
+ complete(&evt->comp);
+}
+
+/**
+ * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
+ * @evt: struct ibmvfc_event
+ *
+ **/
+static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_host *vhost = evt->vhost;
+
+ ibmvfc_free_event(evt);
+ vhost->aborting_passthru = 0;
+ dev_info(vhost->dev, "Passthru command cancelled\n");
+}
+
+/**
+ * ibmvfc_bsg_timeout - Handle a BSG timeout
+ * @job: struct bsg_job that timed out
+ *
+ * Returns:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_bsg_timeout(struct bsg_job *job)
+{
+ struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
+ unsigned long port_id = (unsigned long)job->dd_data;
+ struct ibmvfc_event *evt;
+ struct ibmvfc_tmf *tmf;
+ unsigned long flags;
+ int rc;
+
+ ENTER;
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
+ __ibmvfc_reset_host(vhost);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return 0;
+ }
+
+ vhost->aborting_passthru = 1;
+ evt = ibmvfc_get_event(vhost);
+ ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
+
+ tmf = &evt->iu.tmf;
+ memset(tmf, 0, sizeof(*tmf));
+ tmf->common.version = cpu_to_be32(1);
+ tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
+ tmf->common.length = cpu_to_be16(sizeof(*tmf));
+ tmf->scsi_id = cpu_to_be64(port_id);
+ tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
+ tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
+ rc = ibmvfc_send_event(evt, vhost, default_timeout);
+
+ if (rc != 0) {
+ vhost->aborting_passthru = 0;
+ dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
+ rc = -EIO;
+ } else
+ dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
+ port_id);
+
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ LEAVE;
+ return rc;
+}
+
+/**
+ * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
+ * @vhost: struct ibmvfc_host to send command
+ * @port_id: port ID to send command
+ *
+ * Returns:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
+{
+ struct ibmvfc_port_login *plogi;
+ struct ibmvfc_target *tgt;
+ struct ibmvfc_event *evt;
+ union ibmvfc_iu rsp_iu;
+ unsigned long flags;
+ int rc = 0, issue_login = 1;
+
+ ENTER;
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ list_for_each_entry(tgt, &vhost->targets, queue) {
+ if (tgt->scsi_id == port_id) {
+ issue_login = 0;
+ break;
+ }
+ }
+
+ if (!issue_login)
+ goto unlock_out;
+ if (unlikely((rc = ibmvfc_host_chkready(vhost))))
+ goto unlock_out;
+
+ evt = ibmvfc_get_event(vhost);
+ ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
+ plogi = &evt->iu.plogi;
+ memset(plogi, 0, sizeof(*plogi));
+ plogi->common.version = cpu_to_be32(1);
+ plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
+ plogi->common.length = cpu_to_be16(sizeof(*plogi));
+ plogi->scsi_id = cpu_to_be64(port_id);
+ evt->sync_iu = &rsp_iu;
+ init_completion(&evt->comp);
+
+ rc = ibmvfc_send_event(evt, vhost, default_timeout);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ if (rc)
+ return -EIO;
+
+ wait_for_completion(&evt->comp);
+
+ if (rsp_iu.plogi.common.status)
+ rc = -EIO;
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ ibmvfc_free_event(evt);
+unlock_out:
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ LEAVE;
+ return rc;
+}
+
+/**
+ * ibmvfc_bsg_request - Handle a BSG request
+ * @job: struct bsg_job to be executed
+ *
+ * Returns:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_bsg_request(struct bsg_job *job)
+{
+ struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
+ struct fc_rport *rport = fc_bsg_to_rport(job);
+ struct ibmvfc_passthru_mad *mad;
+ struct ibmvfc_event *evt;
+ union ibmvfc_iu rsp_iu;
+ unsigned long flags, port_id = -1;
+ struct fc_bsg_request *bsg_request = job->request;
+ struct fc_bsg_reply *bsg_reply = job->reply;
+ unsigned int code = bsg_request->msgcode;
+ int rc = 0, req_seg, rsp_seg, issue_login = 0;
+ u32 fc_flags, rsp_len;
+
+ ENTER;
+ bsg_reply->reply_payload_rcv_len = 0;
+ if (rport)
+ port_id = rport->port_id;
+
+ switch (code) {
+ case FC_BSG_HST_ELS_NOLOGIN:
+ port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
+ (bsg_request->rqst_data.h_els.port_id[1] << 8) |
+ bsg_request->rqst_data.h_els.port_id[2];
+ case FC_BSG_RPT_ELS:
+ fc_flags = IBMVFC_FC_ELS;
+ break;
+ case FC_BSG_HST_CT:
+ issue_login = 1;
+ port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
+ (bsg_request->rqst_data.h_ct.port_id[1] << 8) |
+ bsg_request->rqst_data.h_ct.port_id[2];
+ case FC_BSG_RPT_CT:
+ fc_flags = IBMVFC_FC_CT_IU;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ if (port_id == -1)
+ return -EINVAL;
+ if (!mutex_trylock(&vhost->passthru_mutex))
+ return -EBUSY;
+
+ job->dd_data = (void *)port_id;
+ req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
+ job->request_payload.sg_cnt, DMA_TO_DEVICE);
+
+ if (!req_seg) {
+ mutex_unlock(&vhost->passthru_mutex);
+ return -ENOMEM;
+ }
+
+ rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
+ job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
+
+ if (!rsp_seg) {
+ dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
+ job->request_payload.sg_cnt, DMA_TO_DEVICE);
+ mutex_unlock(&vhost->passthru_mutex);
+ return -ENOMEM;
+ }
+
+ if (req_seg > 1 || rsp_seg > 1) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if (issue_login)
+ rc = ibmvfc_bsg_plogi(vhost, port_id);
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+
+ if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
+ unlikely((rc = ibmvfc_host_chkready(vhost)))) {
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ goto out;
+ }
+
+ evt = ibmvfc_get_event(vhost);
+ ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
+ mad = &evt->iu.passthru;
+
+ memset(mad, 0, sizeof(*mad));
+ mad->common.version = cpu_to_be32(1);
+ mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
+ mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
+
+ mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
+ offsetof(struct ibmvfc_passthru_mad, iu));
+ mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
+
+ mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
+ mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
+ mad->iu.flags = cpu_to_be32(fc_flags);
+ mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
+
+ mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
+ mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
+ mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
+ mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
+ mad->iu.scsi_id = cpu_to_be64(port_id);
+ mad->iu.tag = cpu_to_be64((u64)evt);
+ rsp_len = be32_to_cpu(mad->iu.rsp.len);
+
+ evt->sync_iu = &rsp_iu;
+ init_completion(&evt->comp);
+ rc = ibmvfc_send_event(evt, vhost, 0);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ if (rc) {
+ rc = -EIO;
+ goto out;
+ }
+
+ wait_for_completion(&evt->comp);
+
+ if (rsp_iu.passthru.common.status)
+ rc = -EIO;
+ else
+ bsg_reply->reply_payload_rcv_len = rsp_len;
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ ibmvfc_free_event(evt);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ bsg_reply->result = rc;
+ bsg_job_done(job, bsg_reply->result,
+ bsg_reply->reply_payload_rcv_len);
+ rc = 0;
+out:
+ dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
+ job->request_payload.sg_cnt, DMA_TO_DEVICE);
+ dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
+ job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
+ mutex_unlock(&vhost->passthru_mutex);
+ LEAVE;
+ return rc;
+}
+
+/**
+ * ibmvfc_reset_device - Reset the device with the specified reset type
+ * @sdev: scsi device to reset
+ * @type: reset type
+ * @desc: reset type description for log messages
+ *
+ * Returns:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
+{
+ struct ibmvfc_host *vhost = shost_priv(sdev->host);
+ struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+ struct ibmvfc_cmd *tmf;
+ struct ibmvfc_event *evt = NULL;
+ union ibmvfc_iu rsp_iu;
+ struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
+ int rsp_rc = -EBUSY;
+ unsigned long flags;
+ int rsp_code = 0;
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ if (vhost->state == IBMVFC_ACTIVE) {
+ evt = ibmvfc_get_event(vhost);
+ ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
+
+ tmf = &evt->iu.cmd;
+ memset(tmf, 0, sizeof(*tmf));
+ tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
+ tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
+ tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
+ tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
+ tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
+ tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
+ tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
+ int_to_scsilun(sdev->lun, &tmf->iu.lun);
+ tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
+ tmf->iu.tmf_flags = type;
+ evt->sync_iu = &rsp_iu;
+
+ init_completion(&evt->comp);
+ rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
+ }
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ if (rsp_rc != 0) {
+ sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
+ desc, rsp_rc);
+ return -EIO;
+ }
+
+ sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
+ wait_for_completion(&evt->comp);
+
+ if (rsp_iu.cmd.status)
+ rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
+
+ if (rsp_code) {
+ if (fc_rsp->flags & FCP_RSP_LEN_VALID)
+ rsp_code = fc_rsp->data.info.rsp_code;
+
+ sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
+ "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
+ ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
+ rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
+ fc_rsp->scsi_status);
+ rsp_rc = -EIO;
+ } else
+ sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ ibmvfc_free_event(evt);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return rsp_rc;
+}
+
+/**
+ * ibmvfc_match_rport - Match function for specified remote port
+ * @evt: ibmvfc event struct
+ * @device: device to match (rport)
+ *
+ * Returns:
+ * 1 if event matches rport / 0 if event does not match rport
+ **/
+static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
+{
+ struct fc_rport *cmd_rport;
+
+ if (evt->cmnd) {
+ cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
+ if (cmd_rport == rport)
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * ibmvfc_match_target - Match function for specified target
+ * @evt: ibmvfc event struct
+ * @device: device to match (starget)
+ *
+ * Returns:
+ * 1 if event matches starget / 0 if event does not match starget
+ **/
+static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
+{
+ if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
+ return 1;
+ return 0;
+}
+
+/**
+ * ibmvfc_match_lun - Match function for specified LUN
+ * @evt: ibmvfc event struct
+ * @device: device to match (sdev)
+ *
+ * Returns:
+ * 1 if event matches sdev / 0 if event does not match sdev
+ **/
+static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
+{
+ if (evt->cmnd && evt->cmnd->device == device)
+ return 1;
+ return 0;
+}
+
+/**
+ * ibmvfc_wait_for_ops - Wait for ops to complete
+ * @vhost: ibmvfc host struct
+ * @device: device to match (starget or sdev)
+ * @match: match function
+ *
+ * Returns:
+ * SUCCESS / FAILED
+ **/
+static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
+ int (*match) (struct ibmvfc_event *, void *))
+{
+ struct ibmvfc_event *evt;
+ DECLARE_COMPLETION_ONSTACK(comp);
+ int wait;
+ unsigned long flags;
+ signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
+
+ ENTER;
+ do {
+ wait = 0;
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ list_for_each_entry(evt, &vhost->sent, queue) {
+ if (match(evt, device)) {
+ evt->eh_comp = ∁
+ wait++;
+ }
+ }
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ if (wait) {
+ timeout = wait_for_completion_timeout(&comp, timeout);
+
+ if (!timeout) {
+ wait = 0;
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ list_for_each_entry(evt, &vhost->sent, queue) {
+ if (match(evt, device)) {
+ evt->eh_comp = NULL;
+ wait++;
+ }
+ }
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ if (wait)
+ dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
+ LEAVE;
+ return wait ? FAILED : SUCCESS;
+ }
+ }
+ } while (wait);
+
+ LEAVE;
+ return SUCCESS;
+}
+
+/**
+ * ibmvfc_cancel_all - Cancel all outstanding commands to the device
+ * @sdev: scsi device to cancel commands
+ * @type: type of error recovery being performed
+ *
+ * This sends a cancel to the VIOS for the specified device. This does
+ * NOT send any abort to the actual device. That must be done separately.
+ *
+ * Returns:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
+{
+ struct ibmvfc_host *vhost = shost_priv(sdev->host);
+ struct scsi_target *starget = scsi_target(sdev);
+ struct fc_rport *rport = starget_to_rport(starget);
+ struct ibmvfc_tmf *tmf;
+ struct ibmvfc_event *evt, *found_evt;
+ union ibmvfc_iu rsp;
+ int rsp_rc = -EBUSY;
+ unsigned long flags;
+ u16 status;
+
+ ENTER;
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ found_evt = NULL;
+ list_for_each_entry(evt, &vhost->sent, queue) {
+ if (evt->cmnd && evt->cmnd->device == sdev) {
+ found_evt = evt;
+ break;
+ }
+ }
+
+ if (!found_evt) {
+ if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
+ sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return 0;
+ }
+
+ if (vhost->logged_in) {
+ evt = ibmvfc_get_event(vhost);
+ ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
+
+ tmf = &evt->iu.tmf;
+ memset(tmf, 0, sizeof(*tmf));
+ tmf->common.version = cpu_to_be32(1);
+ tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
+ tmf->common.length = cpu_to_be16(sizeof(*tmf));
+ tmf->scsi_id = cpu_to_be64(rport->port_id);
+ int_to_scsilun(sdev->lun, &tmf->lun);
+ if (!(be64_to_cpu(vhost->login_buf->resp.capabilities) & IBMVFC_CAN_SUPPRESS_ABTS))
+ type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
+ if (vhost->state == IBMVFC_ACTIVE)
+ tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
+ else
+ tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
+ tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
+ tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
+
+ evt->sync_iu = &rsp;
+ init_completion(&evt->comp);
+ rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
+ }
+
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ if (rsp_rc != 0) {
+ sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
+ /* If failure is received, the host adapter is most likely going
+ through reset, return success so the caller will wait for the command
+ being cancelled to get returned */
+ return 0;
+ }
+
+ sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
+
+ wait_for_completion(&evt->comp);
+ status = be16_to_cpu(rsp.mad_common.status);
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ ibmvfc_free_event(evt);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ if (status != IBMVFC_MAD_SUCCESS) {
+ sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
+ switch (status) {
+ case IBMVFC_MAD_DRIVER_FAILED:
+ case IBMVFC_MAD_CRQ_ERROR:
+ /* Host adapter most likely going through reset, return success to
+ the caller will wait for the command being cancelled to get returned */
+ return 0;
+ default:
+ return -EIO;
+ };
+ }
+
+ sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
+ return 0;
+}
+
+/**
+ * ibmvfc_match_key - Match function for specified cancel key
+ * @evt: ibmvfc event struct
+ * @key: cancel key to match
+ *
+ * Returns:
+ * 1 if event matches key / 0 if event does not match key
+ **/
+static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
+{
+ unsigned long cancel_key = (unsigned long)key;
+
+ if (evt->crq.format == IBMVFC_CMD_FORMAT &&
+ be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
+ return 1;
+ return 0;
+}
+
+/**
+ * ibmvfc_match_evt - Match function for specified event
+ * @evt: ibmvfc event struct
+ * @match: event to match
+ *
+ * Returns:
+ * 1 if event matches key / 0 if event does not match key
+ **/
+static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
+{
+ if (evt == match)
+ return 1;
+ return 0;
+}
+
+/**
+ * ibmvfc_abort_task_set - Abort outstanding commands to the device
+ * @sdev: scsi device to abort commands
+ *
+ * This sends an Abort Task Set to the VIOS for the specified device. This does
+ * NOT send any cancel to the VIOS. That must be done separately.
+ *
+ * Returns:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_abort_task_set(struct scsi_device *sdev)
+{
+ struct ibmvfc_host *vhost = shost_priv(sdev->host);
+ struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+ struct ibmvfc_cmd *tmf;
+ struct ibmvfc_event *evt, *found_evt;
+ union ibmvfc_iu rsp_iu;
+ struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
+ int rc, rsp_rc = -EBUSY;
+ unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
+ int rsp_code = 0;
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ found_evt = NULL;
+ list_for_each_entry(evt, &vhost->sent, queue) {
+ if (evt->cmnd && evt->cmnd->device == sdev) {
+ found_evt = evt;
+ break;
+ }
+ }
+
+ if (!found_evt) {
+ if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
+ sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return 0;
+ }
+
+ if (vhost->state == IBMVFC_ACTIVE) {
+ evt = ibmvfc_get_event(vhost);
+ ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
+
+ tmf = &evt->iu.cmd;
+ memset(tmf, 0, sizeof(*tmf));
+ tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
+ tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
+ tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
+ tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
+ tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
+ tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
+ tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
+ int_to_scsilun(sdev->lun, &tmf->iu.lun);
+ tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
+ tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
+ evt->sync_iu = &rsp_iu;
+
+ init_completion(&evt->comp);
+ rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
+ }
+
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ if (rsp_rc != 0) {
+ sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
+ return -EIO;
+ }
+
+ sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
+ timeout = wait_for_completion_timeout(&evt->comp, timeout);
+
+ if (!timeout) {
+ rc = ibmvfc_cancel_all(sdev, 0);
+ if (!rc) {
+ rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
+ if (rc == SUCCESS)
+ rc = 0;
+ }
+
+ if (rc) {
+ sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
+ ibmvfc_reset_host(vhost);
+ rsp_rc = -EIO;
+ rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
+
+ if (rc == SUCCESS)
+ rsp_rc = 0;
+
+ rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
+ if (rc != SUCCESS) {
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ ibmvfc_hard_reset_host(vhost);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ rsp_rc = 0;
+ }
+
+ goto out;
+ }
+ }
+
+ if (rsp_iu.cmd.status)
+ rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
+
+ if (rsp_code) {
+ if (fc_rsp->flags & FCP_RSP_LEN_VALID)
+ rsp_code = fc_rsp->data.info.rsp_code;
+
+ sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
+ "flags: %x fcp_rsp: %x, scsi_status: %x\n",
+ ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
+ rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
+ fc_rsp->scsi_status);
+ rsp_rc = -EIO;
+ } else
+ sdev_printk(KERN_INFO, sdev, "Abort successful\n");
+
+out:
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ ibmvfc_free_event(evt);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return rsp_rc;
+}
+
+/**
+ * ibmvfc_eh_abort_handler - Abort a command
+ * @cmd: scsi command to abort
+ *
+ * Returns:
+ * SUCCESS / FAST_IO_FAIL / FAILED
+ **/
+static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
+{
+ struct scsi_device *sdev = cmd->device;
+ struct ibmvfc_host *vhost = shost_priv(sdev->host);
+ int cancel_rc, block_rc;
+ int rc = FAILED;
+
+ ENTER;
+ block_rc = fc_block_scsi_eh(cmd);
+ ibmvfc_wait_while_resetting(vhost);
+ if (block_rc != FAST_IO_FAIL) {
+ cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
+ ibmvfc_abort_task_set(sdev);
+ } else
+ cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
+
+ if (!cancel_rc)
+ rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
+
+ if (block_rc == FAST_IO_FAIL && rc != FAILED)
+ rc = FAST_IO_FAIL;
+
+ LEAVE;
+ return rc;
+}
+
+/**
+ * ibmvfc_eh_device_reset_handler - Reset a single LUN
+ * @cmd: scsi command struct
+ *
+ * Returns:
+ * SUCCESS / FAST_IO_FAIL / FAILED
+ **/
+static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
+{
+ struct scsi_device *sdev = cmd->device;
+ struct ibmvfc_host *vhost = shost_priv(sdev->host);
+ int cancel_rc, block_rc, reset_rc = 0;
+ int rc = FAILED;
+
+ ENTER;
+ block_rc = fc_block_scsi_eh(cmd);
+ ibmvfc_wait_while_resetting(vhost);
+ if (block_rc != FAST_IO_FAIL) {
+ cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
+ reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
+ } else
+ cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
+
+ if (!cancel_rc && !reset_rc)
+ rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
+
+ if (block_rc == FAST_IO_FAIL && rc != FAILED)
+ rc = FAST_IO_FAIL;
+
+ LEAVE;
+ return rc;
+}
+
+/**
+ * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
+ * @sdev: scsi device struct
+ * @data: return code
+ *
+ **/
+static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
+{
+ unsigned long *rc = data;
+ *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
+}
+
+/**
+ * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
+ * @sdev: scsi device struct
+ * @data: return code
+ *
+ **/
+static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
+{
+ unsigned long *rc = data;
+ *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
+}
+
+/**
+ * ibmvfc_eh_target_reset_handler - Reset the target
+ * @cmd: scsi command struct
+ *
+ * Returns:
+ * SUCCESS / FAST_IO_FAIL / FAILED
+ **/
+static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
+{
+ struct scsi_device *sdev = cmd->device;
+ struct ibmvfc_host *vhost = shost_priv(sdev->host);
+ struct scsi_target *starget = scsi_target(sdev);
+ int block_rc;
+ int reset_rc = 0;
+ int rc = FAILED;
+ unsigned long cancel_rc = 0;
+
+ ENTER;
+ block_rc = fc_block_scsi_eh(cmd);
+ ibmvfc_wait_while_resetting(vhost);
+ if (block_rc != FAST_IO_FAIL) {
+ starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
+ reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
+ } else
+ starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
+
+ if (!cancel_rc && !reset_rc)
+ rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
+
+ if (block_rc == FAST_IO_FAIL && rc != FAILED)
+ rc = FAST_IO_FAIL;
+
+ LEAVE;
+ return rc;
+}
+
+/**
+ * ibmvfc_eh_host_reset_handler - Reset the connection to the server
+ * @cmd: struct scsi_cmnd having problems
+ *
+ **/
+static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
+{
+ int rc;
+ struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
+
+ dev_err(vhost->dev, "Resetting connection due to error recovery\n");
+ rc = ibmvfc_issue_fc_host_lip(vhost->host);
+
+ return rc ? FAILED : SUCCESS;
+}
+
+/**
+ * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
+ * @rport: rport struct
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
+{
+ struct Scsi_Host *shost = rport_to_shost(rport);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ struct fc_rport *dev_rport;
+ struct scsi_device *sdev;
+ unsigned long rc;
+
+ ENTER;
+ shost_for_each_device(sdev, shost) {
+ dev_rport = starget_to_rport(scsi_target(sdev));
+ if (dev_rport != rport)
+ continue;
+ ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
+ }
+
+ rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
+
+ if (rc == FAILED)
+ ibmvfc_issue_fc_host_lip(shost);
+ LEAVE;
+}
+
+static const struct ibmvfc_async_desc ae_desc [] = {
+ { "PLOGI", IBMVFC_AE_ELS_PLOGI, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
+ { "LOGO", IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
+ { "PRLO", IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
+ { "N-Port SCN", IBMVFC_AE_SCN_NPORT, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
+ { "Group SCN", IBMVFC_AE_SCN_GROUP, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
+ { "Domain SCN", IBMVFC_AE_SCN_DOMAIN, IBMVFC_DEFAULT_LOG_LEVEL },
+ { "Fabric SCN", IBMVFC_AE_SCN_FABRIC, IBMVFC_DEFAULT_LOG_LEVEL },
+ { "Link Up", IBMVFC_AE_LINK_UP, IBMVFC_DEFAULT_LOG_LEVEL },
+ { "Link Down", IBMVFC_AE_LINK_DOWN, IBMVFC_DEFAULT_LOG_LEVEL },
+ { "Link Dead", IBMVFC_AE_LINK_DEAD, IBMVFC_DEFAULT_LOG_LEVEL },
+ { "Halt", IBMVFC_AE_HALT, IBMVFC_DEFAULT_LOG_LEVEL },
+ { "Resume", IBMVFC_AE_RESUME, IBMVFC_DEFAULT_LOG_LEVEL },
+ { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
+};
+
+static const struct ibmvfc_async_desc unknown_ae = {
+ "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
+};
+
+/**
+ * ibmvfc_get_ae_desc - Get text description for async event
+ * @ae: async event
+ *
+ **/
+static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
+ if (ae_desc[i].ae == ae)
+ return &ae_desc[i];
+
+ return &unknown_ae;
+}
+
+static const struct {
+ enum ibmvfc_ae_link_state state;
+ const char *desc;
+} link_desc [] = {
+ { IBMVFC_AE_LS_LINK_UP, " link up" },
+ { IBMVFC_AE_LS_LINK_BOUNCED, " link bounced" },
+ { IBMVFC_AE_LS_LINK_DOWN, " link down" },
+ { IBMVFC_AE_LS_LINK_DEAD, " link dead" },
+};
+
+/**
+ * ibmvfc_get_link_state - Get text description for link state
+ * @state: link state
+ *
+ **/
+static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(link_desc); i++)
+ if (link_desc[i].state == state)
+ return link_desc[i].desc;
+
+ return "";
+}
+
+/**
+ * ibmvfc_handle_async - Handle an async event from the adapter
+ * @crq: crq to process
+ * @vhost: ibmvfc host struct
+ *
+ **/
+static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
+ struct ibmvfc_host *vhost)
+{
+ const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
+ struct ibmvfc_target *tgt;
+
+ ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
+ " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
+ be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
+ ibmvfc_get_link_state(crq->link_state));
+
+ switch (be64_to_cpu(crq->event)) {
+ case IBMVFC_AE_RESUME:
+ switch (crq->link_state) {
+ case IBMVFC_AE_LS_LINK_DOWN:
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
+ break;
+ case IBMVFC_AE_LS_LINK_DEAD:
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+ break;
+ case IBMVFC_AE_LS_LINK_UP:
+ case IBMVFC_AE_LS_LINK_BOUNCED:
+ default:
+ vhost->events_to_log |= IBMVFC_AE_LINKUP;
+ vhost->delay_init = 1;
+ __ibmvfc_reset_host(vhost);
+ break;
+ }
+
+ break;
+ case IBMVFC_AE_LINK_UP:
+ vhost->events_to_log |= IBMVFC_AE_LINKUP;
+ vhost->delay_init = 1;
+ __ibmvfc_reset_host(vhost);
+ break;
+ case IBMVFC_AE_SCN_FABRIC:
+ case IBMVFC_AE_SCN_DOMAIN:
+ vhost->events_to_log |= IBMVFC_AE_RSCN;
+ if (vhost->state < IBMVFC_HALTED) {
+ vhost->delay_init = 1;
+ __ibmvfc_reset_host(vhost);
+ }
+ break;
+ case IBMVFC_AE_SCN_NPORT:
+ case IBMVFC_AE_SCN_GROUP:
+ vhost->events_to_log |= IBMVFC_AE_RSCN;
+ ibmvfc_reinit_host(vhost);
+ break;
+ case IBMVFC_AE_ELS_LOGO:
+ case IBMVFC_AE_ELS_PRLO:
+ case IBMVFC_AE_ELS_PLOGI:
+ list_for_each_entry(tgt, &vhost->targets, queue) {
+ if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
+ break;
+ if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
+ continue;
+ if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
+ continue;
+ if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
+ continue;
+ if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
+ tgt->logo_rcvd = 1;
+ if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ ibmvfc_reinit_host(vhost);
+ }
+ }
+ break;
+ case IBMVFC_AE_LINK_DOWN:
+ case IBMVFC_AE_ADAPTER_FAILED:
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
+ break;
+ case IBMVFC_AE_LINK_DEAD:
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+ break;
+ case IBMVFC_AE_HALT:
+ ibmvfc_link_down(vhost, IBMVFC_HALTED);
+ break;
+ default:
+ dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
+ break;
+ }
+}
+
+/**
+ * ibmvfc_handle_crq - Handles and frees received events in the CRQ
+ * @crq: Command/Response queue
+ * @vhost: ibmvfc host struct
+ *
+ **/
+static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
+{
+ long rc;
+ struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
+
+ switch (crq->valid) {
+ case IBMVFC_CRQ_INIT_RSP:
+ switch (crq->format) {
+ case IBMVFC_CRQ_INIT:
+ dev_info(vhost->dev, "Partner initialized\n");
+ /* Send back a response */
+ rc = ibmvfc_send_crq_init_complete(vhost);
+ if (rc == 0)
+ ibmvfc_init_host(vhost);
+ else
+ dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
+ break;
+ case IBMVFC_CRQ_INIT_COMPLETE:
+ dev_info(vhost->dev, "Partner initialization complete\n");
+ ibmvfc_init_host(vhost);
+ break;
+ default:
+ dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
+ }
+ return;
+ case IBMVFC_CRQ_XPORT_EVENT:
+ vhost->state = IBMVFC_NO_CRQ;
+ vhost->logged_in = 0;
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
+ if (crq->format == IBMVFC_PARTITION_MIGRATED) {
+ /* We need to re-setup the interpartition connection */
+ dev_info(vhost->dev, "Re-enabling adapter\n");
+ vhost->client_migrated = 1;
+ ibmvfc_purge_requests(vhost, DID_REQUEUE);
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
+ } else {
+ dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
+ ibmvfc_purge_requests(vhost, DID_ERROR);
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
+ }
+ return;
+ case IBMVFC_CRQ_CMD_RSP:
+ break;
+ default:
+ dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
+ return;
+ }
+
+ if (crq->format == IBMVFC_ASYNC_EVENT)
+ return;
+
+ /* The only kind of payload CRQs we should get are responses to
+ * things we send. Make sure this response is to something we
+ * actually sent
+ */
+ if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
+ dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
+ crq->ioba);
+ return;
+ }
+
+ if (unlikely(atomic_read(&evt->free))) {
+ dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
+ crq->ioba);
+ return;
+ }
+
+ del_timer(&evt->timer);
+ list_del(&evt->queue);
+ ibmvfc_trc_end(evt);
+ evt->done(evt);
+}
+
+/**
+ * ibmvfc_scan_finished - Check if the device scan is done.
+ * @shost: scsi host struct
+ * @time: current elapsed time
+ *
+ * Returns:
+ * 0 if scan is not done / 1 if scan is done
+ **/
+static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
+{
+ unsigned long flags;
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ int done = 0;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ if (time >= (init_timeout * HZ)) {
+ dev_info(vhost->dev, "Scan taking longer than %d seconds, "
+ "continuing initialization\n", init_timeout);
+ done = 1;
+ }
+
+ if (vhost->scan_complete)
+ done = 1;
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ return done;
+}
+
+/**
+ * ibmvfc_slave_alloc - Setup the device's task set value
+ * @sdev: struct scsi_device device to configure
+ *
+ * Set the device's task set value so that error handling works as
+ * expected.
+ *
+ * Returns:
+ * 0 on success / -ENXIO if device does not exist
+ **/
+static int ibmvfc_slave_alloc(struct scsi_device *sdev)
+{
+ struct Scsi_Host *shost = sdev->host;
+ struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ unsigned long flags = 0;
+
+ if (!rport || fc_remote_port_chkready(rport))
+ return -ENXIO;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ return 0;
+}
+
+/**
+ * ibmvfc_target_alloc - Setup the target's task set value
+ * @starget: struct scsi_target
+ *
+ * Set the target's task set value so that error handling works as
+ * expected.
+ *
+ * Returns:
+ * 0 on success / -ENXIO if device does not exist
+ **/
+static int ibmvfc_target_alloc(struct scsi_target *starget)
+{
+ struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ starget->hostdata = (void *)(unsigned long)vhost->task_set++;
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ return 0;
+}
+
+/**
+ * ibmvfc_slave_configure - Configure the device
+ * @sdev: struct scsi_device device to configure
+ *
+ * Enable allow_restart for a device if it is a disk. Adjust the
+ * queue_depth here also.
+ *
+ * Returns:
+ * 0
+ **/
+static int ibmvfc_slave_configure(struct scsi_device *sdev)
+{
+ struct Scsi_Host *shost = sdev->host;
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ if (sdev->type == TYPE_DISK)
+ sdev->allow_restart = 1;
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ return 0;
+}
+
+/**
+ * ibmvfc_change_queue_depth - Change the device's queue depth
+ * @sdev: scsi device struct
+ * @qdepth: depth to set
+ * @reason: calling context
+ *
+ * Return value:
+ * actual depth set
+ **/
+static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
+{
+ if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
+ qdepth = IBMVFC_MAX_CMDS_PER_LUN;
+
+ return scsi_change_queue_depth(sdev, qdepth);
+}
+
+static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ vhost->login_buf->resp.partition_name);
+}
+
+static ssize_t ibmvfc_show_host_device_name(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ vhost->login_buf->resp.device_name);
+}
+
+static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ vhost->login_buf->resp.port_loc_code);
+}
+
+static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ vhost->login_buf->resp.drc_name);
+}
+
+static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
+}
+
+static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
+}
+
+/**
+ * ibmvfc_show_log_level - Show the adapter's error logging level
+ * @dev: class device struct
+ * @buf: buffer
+ *
+ * Return value:
+ * number of bytes printed to buffer
+ **/
+static ssize_t ibmvfc_show_log_level(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ unsigned long flags = 0;
+ int len;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ return len;
+}
+
+/**
+ * ibmvfc_store_log_level - Change the adapter's error logging level
+ * @dev: class device struct
+ * @buf: buffer
+ *
+ * Return value:
+ * number of bytes printed to buffer
+ **/
+static ssize_t ibmvfc_store_log_level(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ vhost->log_level = simple_strtoul(buf, NULL, 10);
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ return strlen(buf);
+}
+
+static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
+static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
+static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
+static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
+static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
+static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
+static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
+ ibmvfc_show_log_level, ibmvfc_store_log_level);
+
+#ifdef CONFIG_SCSI_IBMVFC_TRACE
+/**
+ * ibmvfc_read_trace - Dump the adapter trace
+ * @filp: open sysfs file
+ * @kobj: kobject struct
+ * @bin_attr: bin_attribute struct
+ * @buf: buffer
+ * @off: offset
+ * @count: buffer size
+ *
+ * Return value:
+ * number of bytes printed to buffer
+ **/
+static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvfc_host *vhost = shost_priv(shost);
+ unsigned long flags = 0;
+ int size = IBMVFC_TRACE_SIZE;
+ char *src = (char *)vhost->trace;
+
+ if (off > size)
+ return 0;
+ if (off + count > size) {
+ size -= off;
+ count = size;
+ }
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ memcpy(buf, &src[off], count);
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ return count;
+}
+
+static struct bin_attribute ibmvfc_trace_attr = {
+ .attr = {
+ .name = "trace",
+ .mode = S_IRUGO,
+ },
+ .size = 0,
+ .read = ibmvfc_read_trace,
+};
+#endif
+
+static struct device_attribute *ibmvfc_attrs[] = {
+ &dev_attr_partition_name,
+ &dev_attr_device_name,
+ &dev_attr_port_loc_code,
+ &dev_attr_drc_name,
+ &dev_attr_npiv_version,
+ &dev_attr_capabilities,
+ &dev_attr_log_level,
+ NULL
+};
+
+static struct scsi_host_template driver_template = {
+ .module = THIS_MODULE,
+ .name = "IBM POWER Virtual FC Adapter",
+ .proc_name = IBMVFC_NAME,
+ .queuecommand = ibmvfc_queuecommand,
+ .eh_timed_out = fc_eh_timed_out,
+ .eh_abort_handler = ibmvfc_eh_abort_handler,
+ .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
+ .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
+ .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
+ .slave_alloc = ibmvfc_slave_alloc,
+ .slave_configure = ibmvfc_slave_configure,
+ .target_alloc = ibmvfc_target_alloc,
+ .scan_finished = ibmvfc_scan_finished,
+ .change_queue_depth = ibmvfc_change_queue_depth,
+ .cmd_per_lun = 16,
+ .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
+ .this_id = -1,
+ .sg_tablesize = SG_ALL,
+ .max_sectors = IBMVFC_MAX_SECTORS,
+ .use_clustering = ENABLE_CLUSTERING,
+ .shost_attrs = ibmvfc_attrs,
+ .track_queue_depth = 1,
+};
+
+/**
+ * ibmvfc_next_async_crq - Returns the next entry in async queue
+ * @vhost: ibmvfc host struct
+ *
+ * Returns:
+ * Pointer to next entry in queue / NULL if empty
+ **/
+static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
+ struct ibmvfc_async_crq *crq;
+
+ crq = &async_crq->msgs[async_crq->cur];
+ if (crq->valid & 0x80) {
+ if (++async_crq->cur == async_crq->size)
+ async_crq->cur = 0;
+ rmb();
+ } else
+ crq = NULL;
+
+ return crq;
+}
+
+/**
+ * ibmvfc_next_crq - Returns the next entry in message queue
+ * @vhost: ibmvfc host struct
+ *
+ * Returns:
+ * Pointer to next entry in queue / NULL if empty
+ **/
+static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_crq_queue *queue = &vhost->crq;
+ struct ibmvfc_crq *crq;
+
+ crq = &queue->msgs[queue->cur];
+ if (crq->valid & 0x80) {
+ if (++queue->cur == queue->size)
+ queue->cur = 0;
+ rmb();
+ } else
+ crq = NULL;
+
+ return crq;
+}
+
+/**
+ * ibmvfc_interrupt - Interrupt handler
+ * @irq: number of irq to handle, not used
+ * @dev_instance: ibmvfc_host that received interrupt
+ *
+ * Returns:
+ * IRQ_HANDLED
+ **/
+static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
+{
+ struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
+ unsigned long flags;
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ vio_disable_interrupts(to_vio_dev(vhost->dev));
+ tasklet_schedule(&vhost->tasklet);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return IRQ_HANDLED;
+}
+
+/**
+ * ibmvfc_tasklet - Interrupt handler tasklet
+ * @data: ibmvfc host struct
+ *
+ * Returns:
+ * Nothing
+ **/
+static void ibmvfc_tasklet(void *data)
+{
+ struct ibmvfc_host *vhost = data;
+ struct vio_dev *vdev = to_vio_dev(vhost->dev);
+ struct ibmvfc_crq *crq;
+ struct ibmvfc_async_crq *async;
+ unsigned long flags;
+ int done = 0;
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ while (!done) {
+ /* Pull all the valid messages off the async CRQ */
+ while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
+ ibmvfc_handle_async(async, vhost);
+ async->valid = 0;
+ wmb();
+ }
+
+ /* Pull all the valid messages off the CRQ */
+ while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
+ ibmvfc_handle_crq(crq, vhost);
+ crq->valid = 0;
+ wmb();
+ }
+
+ vio_enable_interrupts(vdev);
+ if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
+ vio_disable_interrupts(vdev);
+ ibmvfc_handle_async(async, vhost);
+ async->valid = 0;
+ wmb();
+ } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
+ vio_disable_interrupts(vdev);
+ ibmvfc_handle_crq(crq, vhost);
+ crq->valid = 0;
+ wmb();
+ } else
+ done = 1;
+ }
+
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+}
+
+/**
+ * ibmvfc_init_tgt - Set the next init job step for the target
+ * @tgt: ibmvfc target struct
+ * @job_step: job step to perform
+ *
+ **/
+static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
+ void (*job_step) (struct ibmvfc_target *))
+{
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
+ tgt->job_step = job_step;
+ wake_up(&tgt->vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
+ * @tgt: ibmvfc target struct
+ * @job_step: initialization job step
+ *
+ * Returns: 1 if step will be retried / 0 if not
+ *
+ **/
+static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
+ void (*job_step) (struct ibmvfc_target *))
+{
+ if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ wake_up(&tgt->vhost->work_wait_q);
+ return 0;
+ } else
+ ibmvfc_init_tgt(tgt, job_step);
+ return 1;
+}
+
+/* Defined in FC-LS */
+static const struct {
+ int code;
+ int retry;
+ int logged_in;
+} prli_rsp [] = {
+ { 0, 1, 0 },
+ { 1, 0, 1 },
+ { 2, 1, 0 },
+ { 3, 1, 0 },
+ { 4, 0, 0 },
+ { 5, 0, 0 },
+ { 6, 0, 1 },
+ { 7, 0, 0 },
+ { 8, 1, 0 },
+};
+
+/**
+ * ibmvfc_get_prli_rsp - Find PRLI response index
+ * @flags: PRLI response flags
+ *
+ **/
+static int ibmvfc_get_prli_rsp(u16 flags)
+{
+ int i;
+ int code = (flags & 0x0f00) >> 8;
+
+ for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
+ if (prli_rsp[i].code == code)
+ return i;
+
+ return 0;
+}
+
+/**
+ * ibmvfc_tgt_prli_done - Completion handler for Process Login
+ * @evt: ibmvfc event struct
+ *
+ **/
+static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_target *tgt = evt->tgt;
+ struct ibmvfc_host *vhost = evt->vhost;
+ struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
+ struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
+ u32 status = be16_to_cpu(rsp->common.status);
+ int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
+
+ vhost->discovery_threads--;
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+ switch (status) {
+ case IBMVFC_MAD_SUCCESS:
+ tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
+ parms->type, parms->flags, parms->service_parms);
+
+ if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
+ index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
+ if (prli_rsp[index].logged_in) {
+ if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
+ tgt->need_login = 0;
+ tgt->ids.roles = 0;
+ if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
+ tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
+ if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
+ tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
+ tgt->add_rport = 1;
+ } else
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ } else if (prli_rsp[index].retry)
+ ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
+ else
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ } else
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ break;
+ case IBMVFC_MAD_DRIVER_FAILED:
+ break;
+ case IBMVFC_MAD_CRQ_ERROR:
+ ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
+ break;
+ case IBMVFC_MAD_FAILED:
+ default:
+ if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
+ be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
+ level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
+ else if (tgt->logo_rcvd)
+ level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
+ else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
+ level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
+ else
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+
+ tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
+ ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
+ rsp->status, rsp->error, status);
+ break;
+ }
+
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ ibmvfc_free_event(evt);
+ wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_tgt_send_prli - Send a process login
+ * @tgt: ibmvfc target struct
+ *
+ **/
+static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
+{
+ struct ibmvfc_process_login *prli;
+ struct ibmvfc_host *vhost = tgt->vhost;
+ struct ibmvfc_event *evt;
+
+ if (vhost->discovery_threads >= disc_threads)
+ return;
+
+ kref_get(&tgt->kref);
+ evt = ibmvfc_get_event(vhost);
+ vhost->discovery_threads++;
+ ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
+ evt->tgt = tgt;
+ prli = &evt->iu.prli;
+ memset(prli, 0, sizeof(*prli));
+ prli->common.version = cpu_to_be32(1);
+ prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
+ prli->common.length = cpu_to_be16(sizeof(*prli));
+ prli->scsi_id = cpu_to_be64(tgt->scsi_id);
+
+ prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
+ prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
+ prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
+ prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
+
+ if (cls3_error)
+ prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
+
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
+ if (ibmvfc_send_event(evt, vhost, default_timeout)) {
+ vhost->discovery_threads--;
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ } else
+ tgt_dbg(tgt, "Sent process login\n");
+}
+
+/**
+ * ibmvfc_tgt_plogi_done - Completion handler for Port Login
+ * @evt: ibmvfc event struct
+ *
+ **/
+static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_target *tgt = evt->tgt;
+ struct ibmvfc_host *vhost = evt->vhost;
+ struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
+ u32 status = be16_to_cpu(rsp->common.status);
+ int level = IBMVFC_DEFAULT_LOG_LEVEL;
+
+ vhost->discovery_threads--;
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+ switch (status) {
+ case IBMVFC_MAD_SUCCESS:
+ tgt_dbg(tgt, "Port Login succeeded\n");
+ if (tgt->ids.port_name &&
+ tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
+ vhost->reinit = 1;
+ tgt_dbg(tgt, "Port re-init required\n");
+ break;
+ }
+ tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
+ tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
+ tgt->ids.port_id = tgt->scsi_id;
+ memcpy(&tgt->service_parms, &rsp->service_parms,
+ sizeof(tgt->service_parms));
+ memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
+ sizeof(tgt->service_parms_change));
+ ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
+ break;
+ case IBMVFC_MAD_DRIVER_FAILED:
+ break;
+ case IBMVFC_MAD_CRQ_ERROR:
+ ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
+ break;
+ case IBMVFC_MAD_FAILED:
+ default:
+ if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
+ level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
+ else
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+
+ tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
+ ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), rsp->status, rsp->error,
+ ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), rsp->fc_type,
+ ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), rsp->fc_explain, status);
+ break;
+ }
+
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ ibmvfc_free_event(evt);
+ wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
+ * @tgt: ibmvfc target struct
+ *
+ **/
+static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
+{
+ struct ibmvfc_port_login *plogi;
+ struct ibmvfc_host *vhost = tgt->vhost;
+ struct ibmvfc_event *evt;
+
+ if (vhost->discovery_threads >= disc_threads)
+ return;
+
+ kref_get(&tgt->kref);
+ tgt->logo_rcvd = 0;
+ evt = ibmvfc_get_event(vhost);
+ vhost->discovery_threads++;
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
+ ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
+ evt->tgt = tgt;
+ plogi = &evt->iu.plogi;
+ memset(plogi, 0, sizeof(*plogi));
+ plogi->common.version = cpu_to_be32(1);
+ plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
+ plogi->common.length = cpu_to_be16(sizeof(*plogi));
+ plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
+
+ if (ibmvfc_send_event(evt, vhost, default_timeout)) {
+ vhost->discovery_threads--;
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ } else
+ tgt_dbg(tgt, "Sent port login\n");
+}
+
+/**
+ * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
+ * @evt: ibmvfc event struct
+ *
+ **/
+static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_target *tgt = evt->tgt;
+ struct ibmvfc_host *vhost = evt->vhost;
+ struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
+ u32 status = be16_to_cpu(rsp->common.status);
+
+ vhost->discovery_threads--;
+ ibmvfc_free_event(evt);
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+
+ switch (status) {
+ case IBMVFC_MAD_SUCCESS:
+ tgt_dbg(tgt, "Implicit Logout succeeded\n");
+ break;
+ case IBMVFC_MAD_DRIVER_FAILED:
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ wake_up(&vhost->work_wait_q);
+ return;
+ case IBMVFC_MAD_FAILED:
+ default:
+ tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
+ break;
+ }
+
+ if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
+ ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
+ else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
+ tgt->scsi_id != tgt->new_scsi_id)
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
+ * @tgt: ibmvfc target struct
+ *
+ **/
+static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
+{
+ struct ibmvfc_implicit_logout *mad;
+ struct ibmvfc_host *vhost = tgt->vhost;
+ struct ibmvfc_event *evt;
+
+ if (vhost->discovery_threads >= disc_threads)
+ return;
+
+ kref_get(&tgt->kref);
+ evt = ibmvfc_get_event(vhost);
+ vhost->discovery_threads++;
+ ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
+ evt->tgt = tgt;
+ mad = &evt->iu.implicit_logout;
+ memset(mad, 0, sizeof(*mad));
+ mad->common.version = cpu_to_be32(1);
+ mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
+ mad->common.length = cpu_to_be16(sizeof(*mad));
+ mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
+
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
+ if (ibmvfc_send_event(evt, vhost, default_timeout)) {
+ vhost->discovery_threads--;
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ } else
+ tgt_dbg(tgt, "Sent Implicit Logout\n");
+}
+
+/**
+ * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
+ * @mad: ibmvfc passthru mad struct
+ * @tgt: ibmvfc target struct
+ *
+ * Returns:
+ * 1 if PLOGI needed / 0 if PLOGI not needed
+ **/
+static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
+ struct ibmvfc_target *tgt)
+{
+ if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
+ return 1;
+ if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
+ return 1;
+ if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
+ return 1;
+ return 0;
+}
+
+/**
+ * ibmvfc_tgt_adisc_done - Completion handler for ADISC
+ * @evt: ibmvfc event struct
+ *
+ **/
+static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_target *tgt = evt->tgt;
+ struct ibmvfc_host *vhost = evt->vhost;
+ struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
+ u32 status = be16_to_cpu(mad->common.status);
+ u8 fc_reason, fc_explain;
+
+ vhost->discovery_threads--;
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+ del_timer(&tgt->timer);
+
+ switch (status) {
+ case IBMVFC_MAD_SUCCESS:
+ tgt_dbg(tgt, "ADISC succeeded\n");
+ if (ibmvfc_adisc_needs_plogi(mad, tgt))
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ break;
+ case IBMVFC_MAD_DRIVER_FAILED:
+ break;
+ case IBMVFC_MAD_FAILED:
+ default:
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
+ fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
+ tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
+ ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
+ mad->iu.status, mad->iu.error,
+ ibmvfc_get_fc_type(fc_reason), fc_reason,
+ ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
+ break;
+ }
+
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ ibmvfc_free_event(evt);
+ wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_init_passthru - Initialize an event struct for FC passthru
+ * @evt: ibmvfc event struct
+ *
+ **/
+static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
+
+ memset(mad, 0, sizeof(*mad));
+ mad->common.version = cpu_to_be32(1);
+ mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
+ mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
+ mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
+ offsetof(struct ibmvfc_passthru_mad, iu));
+ mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
+ mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
+ mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
+ mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
+ offsetof(struct ibmvfc_passthru_mad, fc_iu) +
+ offsetof(struct ibmvfc_passthru_fc_iu, payload));
+ mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
+ mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
+ offsetof(struct ibmvfc_passthru_mad, fc_iu) +
+ offsetof(struct ibmvfc_passthru_fc_iu, response));
+ mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
+}
+
+/**
+ * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
+ * @evt: ibmvfc event struct
+ *
+ * Just cleanup this event struct. Everything else is handled by
+ * the ADISC completion handler. If the ADISC never actually comes
+ * back, we still have the timer running on the ADISC event struct
+ * which will fire and cause the CRQ to get reset.
+ *
+ **/
+static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_host *vhost = evt->vhost;
+ struct ibmvfc_target *tgt = evt->tgt;
+
+ tgt_dbg(tgt, "ADISC cancel complete\n");
+ vhost->abort_threads--;
+ ibmvfc_free_event(evt);
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_adisc_timeout - Handle an ADISC timeout
+ * @tgt: ibmvfc target struct
+ *
+ * If an ADISC times out, send a cancel. If the cancel times
+ * out, reset the CRQ. When the ADISC comes back as cancelled,
+ * log back into the target.
+ **/
+static void ibmvfc_adisc_timeout(struct timer_list *t)
+{
+ struct ibmvfc_target *tgt = from_timer(tgt, t, timer);
+ struct ibmvfc_host *vhost = tgt->vhost;
+ struct ibmvfc_event *evt;
+ struct ibmvfc_tmf *tmf;
+ unsigned long flags;
+ int rc;
+
+ tgt_dbg(tgt, "ADISC timeout\n");
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ if (vhost->abort_threads >= disc_threads ||
+ tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
+ vhost->state != IBMVFC_INITIALIZING ||
+ vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return;
+ }
+
+ vhost->abort_threads++;
+ kref_get(&tgt->kref);
+ evt = ibmvfc_get_event(vhost);
+ ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
+
+ evt->tgt = tgt;
+ tmf = &evt->iu.tmf;
+ memset(tmf, 0, sizeof(*tmf));
+ tmf->common.version = cpu_to_be32(1);
+ tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
+ tmf->common.length = cpu_to_be16(sizeof(*tmf));
+ tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
+ tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
+
+ rc = ibmvfc_send_event(evt, vhost, default_timeout);
+
+ if (rc) {
+ tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
+ vhost->abort_threads--;
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ __ibmvfc_reset_host(vhost);
+ } else
+ tgt_dbg(tgt, "Attempting to cancel ADISC\n");
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+}
+
+/**
+ * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
+ * @tgt: ibmvfc target struct
+ *
+ * When sending an ADISC we end up with two timers running. The
+ * first timer is the timer in the ibmvfc target struct. If this
+ * fires, we send a cancel to the target. The second timer is the
+ * timer on the ibmvfc event for the ADISC, which is longer. If that
+ * fires, it means the ADISC timed out and our attempt to cancel it
+ * also failed, so we need to reset the CRQ.
+ **/
+static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
+{
+ struct ibmvfc_passthru_mad *mad;
+ struct ibmvfc_host *vhost = tgt->vhost;
+ struct ibmvfc_event *evt;
+
+ if (vhost->discovery_threads >= disc_threads)
+ return;
+
+ kref_get(&tgt->kref);
+ evt = ibmvfc_get_event(vhost);
+ vhost->discovery_threads++;
+ ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
+ evt->tgt = tgt;
+
+ ibmvfc_init_passthru(evt);
+ mad = &evt->iu.passthru;
+ mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
+ mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
+ mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
+
+ mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
+ memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
+ sizeof(vhost->login_buf->resp.port_name));
+ memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
+ sizeof(vhost->login_buf->resp.node_name));
+ mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
+
+ if (timer_pending(&tgt->timer))
+ mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
+ else {
+ tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
+ add_timer(&tgt->timer);
+ }
+
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
+ if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
+ vhost->discovery_threads--;
+ del_timer(&tgt->timer);
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ } else
+ tgt_dbg(tgt, "Sent ADISC\n");
+}
+
+/**
+ * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
+ * @evt: ibmvfc event struct
+ *
+ **/
+static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_target *tgt = evt->tgt;
+ struct ibmvfc_host *vhost = evt->vhost;
+ struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
+ u32 status = be16_to_cpu(rsp->common.status);
+ int level = IBMVFC_DEFAULT_LOG_LEVEL;
+
+ vhost->discovery_threads--;
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+ switch (status) {
+ case IBMVFC_MAD_SUCCESS:
+ tgt_dbg(tgt, "Query Target succeeded\n");
+ tgt->new_scsi_id = be64_to_cpu(rsp->scsi_id);
+ if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
+ ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
+ else
+ ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
+ break;
+ case IBMVFC_MAD_DRIVER_FAILED:
+ break;
+ case IBMVFC_MAD_CRQ_ERROR:
+ ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
+ break;
+ case IBMVFC_MAD_FAILED:
+ default:
+ if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
+ be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
+ be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+ else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
+ level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
+ else
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+
+ tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
+ ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
+ rsp->status, rsp->error, ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)),
+ rsp->fc_type, ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)),
+ rsp->fc_explain, status);
+ break;
+ }
+
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ ibmvfc_free_event(evt);
+ wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
+ * @tgt: ibmvfc target struct
+ *
+ **/
+static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
+{
+ struct ibmvfc_query_tgt *query_tgt;
+ struct ibmvfc_host *vhost = tgt->vhost;
+ struct ibmvfc_event *evt;
+
+ if (vhost->discovery_threads >= disc_threads)
+ return;
+
+ kref_get(&tgt->kref);
+ evt = ibmvfc_get_event(vhost);
+ vhost->discovery_threads++;
+ evt->tgt = tgt;
+ ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
+ query_tgt = &evt->iu.query_tgt;
+ memset(query_tgt, 0, sizeof(*query_tgt));
+ query_tgt->common.version = cpu_to_be32(1);
+ query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
+ query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
+ query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
+
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
+ if (ibmvfc_send_event(evt, vhost, default_timeout)) {
+ vhost->discovery_threads--;
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ } else
+ tgt_dbg(tgt, "Sent Query Target\n");
+}
+
+/**
+ * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
+ * @vhost: ibmvfc host struct
+ * @scsi_id: SCSI ID to allocate target for
+ *
+ * Returns:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
+{
+ struct ibmvfc_target *tgt;
+ unsigned long flags;
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ list_for_each_entry(tgt, &vhost->targets, queue) {
+ if (tgt->scsi_id == scsi_id) {
+ if (tgt->need_login)
+ ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
+ goto unlock_out;
+ }
+ }
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
+ memset(tgt, 0, sizeof(*tgt));
+ tgt->scsi_id = scsi_id;
+ tgt->new_scsi_id = scsi_id;
+ tgt->vhost = vhost;
+ tgt->need_login = 1;
+ tgt->cancel_key = vhost->task_set++;
+ timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
+ kref_init(&tgt->kref);
+ ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ list_add_tail(&tgt->queue, &vhost->targets);
+
+unlock_out:
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return 0;
+}
+
+/**
+ * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
+ * @vhost: ibmvfc host struct
+ *
+ * Returns:
+ * 0 on success / other on failure
+ **/
+static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
+{
+ int i, rc;
+
+ for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
+ rc = ibmvfc_alloc_target(vhost,
+ be32_to_cpu(vhost->disc_buf->scsi_id[i]) &
+ IBMVFC_DISC_TGT_SCSI_ID_MASK);
+
+ return rc;
+}
+
+/**
+ * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
+ * @evt: ibmvfc event struct
+ *
+ **/
+static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_host *vhost = evt->vhost;
+ struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
+ u32 mad_status = be16_to_cpu(rsp->common.status);
+ int level = IBMVFC_DEFAULT_LOG_LEVEL;
+
+ switch (mad_status) {
+ case IBMVFC_MAD_SUCCESS:
+ ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
+ vhost->num_targets = be32_to_cpu(rsp->num_written);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
+ break;
+ case IBMVFC_MAD_FAILED:
+ level += ibmvfc_retry_host_init(vhost);
+ ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
+ ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
+ rsp->status, rsp->error);
+ break;
+ case IBMVFC_MAD_DRIVER_FAILED:
+ break;
+ default:
+ dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+ break;
+ }
+
+ ibmvfc_free_event(evt);
+ wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_discover_targets - Send Discover Targets MAD
+ * @vhost: ibmvfc host struct
+ *
+ **/
+static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_discover_targets *mad;
+ struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
+
+ ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
+ mad = &evt->iu.discover_targets;
+ memset(mad, 0, sizeof(*mad));
+ mad->common.version = cpu_to_be32(1);
+ mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
+ mad->common.length = cpu_to_be16(sizeof(*mad));
+ mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
+ mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
+ mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
+
+ if (!ibmvfc_send_event(evt, vhost, default_timeout))
+ ibmvfc_dbg(vhost, "Sent discover targets\n");
+ else
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+}
+
+/**
+ * ibmvfc_npiv_login_done - Completion handler for NPIV Login
+ * @evt: ibmvfc event struct
+ *
+ **/
+static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_host *vhost = evt->vhost;
+ u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
+ struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
+ unsigned int npiv_max_sectors;
+ int level = IBMVFC_DEFAULT_LOG_LEVEL;
+
+ switch (mad_status) {
+ case IBMVFC_MAD_SUCCESS:
+ ibmvfc_free_event(evt);
+ break;
+ case IBMVFC_MAD_FAILED:
+ if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
+ level += ibmvfc_retry_host_init(vhost);
+ else
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+ ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
+ ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
+ rsp->status, rsp->error);
+ ibmvfc_free_event(evt);
+ return;
+ case IBMVFC_MAD_CRQ_ERROR:
+ ibmvfc_retry_host_init(vhost);
+ case IBMVFC_MAD_DRIVER_FAILED:
+ ibmvfc_free_event(evt);
+ return;
+ default:
+ dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+ ibmvfc_free_event(evt);
+ return;
+ }
+
+ vhost->client_migrated = 0;
+
+ if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
+ dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
+ rsp->flags);
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+ wake_up(&vhost->work_wait_q);
+ return;
+ }
+
+ if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
+ dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
+ rsp->max_cmds);
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+ wake_up(&vhost->work_wait_q);
+ return;
+ }
+
+ vhost->logged_in = 1;
+ npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
+ dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
+ rsp->partition_name, rsp->device_name, rsp->port_loc_code,
+ rsp->drc_name, npiv_max_sectors);
+
+ fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
+ fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
+ fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
+ fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
+ fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
+ fc_host_supported_classes(vhost->host) = 0;
+ if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
+ fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
+ if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
+ fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
+ if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
+ fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
+ fc_host_maxframe_size(vhost->host) =
+ be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
+
+ vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
+ vhost->host->max_sectors = npiv_max_sectors;
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
+ wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_npiv_login - Sends NPIV login
+ * @vhost: ibmvfc host struct
+ *
+ **/
+static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_npiv_login_mad *mad;
+ struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
+
+ ibmvfc_gather_partition_info(vhost);
+ ibmvfc_set_login_info(vhost);
+ ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
+
+ memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
+ mad = &evt->iu.npiv_login;
+ memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
+ mad->common.version = cpu_to_be32(1);
+ mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
+ mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
+ mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
+ mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
+
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
+
+ if (!ibmvfc_send_event(evt, vhost, default_timeout))
+ ibmvfc_dbg(vhost, "Sent NPIV login\n");
+ else
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+};
+
+/**
+ * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
+ * @vhost: ibmvfc host struct
+ *
+ **/
+static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
+{
+ struct ibmvfc_host *vhost = evt->vhost;
+ u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
+
+ ibmvfc_free_event(evt);
+
+ switch (mad_status) {
+ case IBMVFC_MAD_SUCCESS:
+ if (list_empty(&vhost->sent) &&
+ vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
+ ibmvfc_init_host(vhost);
+ return;
+ }
+ break;
+ case IBMVFC_MAD_FAILED:
+ case IBMVFC_MAD_NOT_SUPPORTED:
+ case IBMVFC_MAD_CRQ_ERROR:
+ case IBMVFC_MAD_DRIVER_FAILED:
+ default:
+ ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
+ break;
+ }
+
+ ibmvfc_hard_reset_host(vhost);
+}
+
+/**
+ * ibmvfc_npiv_logout - Issue an NPIV Logout
+ * @vhost: ibmvfc host struct
+ *
+ **/
+static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_npiv_logout_mad *mad;
+ struct ibmvfc_event *evt;
+
+ evt = ibmvfc_get_event(vhost);
+ ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
+
+ mad = &evt->iu.npiv_logout;
+ memset(mad, 0, sizeof(*mad));
+ mad->common.version = cpu_to_be32(1);
+ mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
+ mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
+
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
+
+ if (!ibmvfc_send_event(evt, vhost, default_timeout))
+ ibmvfc_dbg(vhost, "Sent NPIV logout\n");
+ else
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+}
+
+/**
+ * ibmvfc_dev_init_to_do - Is there target initialization work to do?
+ * @vhost: ibmvfc host struct
+ *
+ * Returns:
+ * 1 if work to do / 0 if not
+ **/
+static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_target *tgt;
+
+ list_for_each_entry(tgt, &vhost->targets, queue) {
+ if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
+ tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
+ return 1;
+ }
+
+ return 0;
+}
+
+/**
+ * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
+ * @vhost: ibmvfc host struct
+ *
+ * Returns:
+ * 1 if work to do / 0 if not
+ **/
+static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_target *tgt;
+
+ if (kthread_should_stop())
+ return 1;
+ switch (vhost->action) {
+ case IBMVFC_HOST_ACTION_NONE:
+ case IBMVFC_HOST_ACTION_INIT_WAIT:
+ case IBMVFC_HOST_ACTION_LOGO_WAIT:
+ return 0;
+ case IBMVFC_HOST_ACTION_TGT_INIT:
+ case IBMVFC_HOST_ACTION_QUERY_TGTS:
+ if (vhost->discovery_threads == disc_threads)
+ return 0;
+ list_for_each_entry(tgt, &vhost->targets, queue)
+ if (tgt->action == IBMVFC_TGT_ACTION_INIT)
+ return 1;
+ list_for_each_entry(tgt, &vhost->targets, queue)
+ if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
+ return 0;
+ return 1;
+ case IBMVFC_HOST_ACTION_LOGO:
+ case IBMVFC_HOST_ACTION_INIT:
+ case IBMVFC_HOST_ACTION_ALLOC_TGTS:
+ case IBMVFC_HOST_ACTION_TGT_DEL:
+ case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
+ case IBMVFC_HOST_ACTION_QUERY:
+ case IBMVFC_HOST_ACTION_RESET:
+ case IBMVFC_HOST_ACTION_REENABLE:
+ default:
+ break;
+ }
+
+ return 1;
+}
+
+/**
+ * ibmvfc_work_to_do - Is there task level work to do?
+ * @vhost: ibmvfc host struct
+ *
+ * Returns:
+ * 1 if work to do / 0 if not
+ **/
+static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
+{
+ unsigned long flags;
+ int rc;
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ rc = __ibmvfc_work_to_do(vhost);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return rc;
+}
+
+/**
+ * ibmvfc_log_ae - Log async events if necessary
+ * @vhost: ibmvfc host struct
+ * @events: events to log
+ *
+ **/
+static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
+{
+ if (events & IBMVFC_AE_RSCN)
+ fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
+ if ((events & IBMVFC_AE_LINKDOWN) &&
+ vhost->state >= IBMVFC_HALTED)
+ fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
+ if ((events & IBMVFC_AE_LINKUP) &&
+ vhost->state == IBMVFC_INITIALIZING)
+ fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
+}
+
+/**
+ * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
+ * @tgt: ibmvfc target struct
+ *
+ **/
+static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
+{
+ struct ibmvfc_host *vhost = tgt->vhost;
+ struct fc_rport *rport;
+ unsigned long flags;
+
+ tgt_dbg(tgt, "Adding rport\n");
+ rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+
+ if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
+ tgt_dbg(tgt, "Deleting rport\n");
+ list_del(&tgt->queue);
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ fc_remote_port_delete(rport);
+ del_timer_sync(&tgt->timer);
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ return;
+ } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return;
+ }
+
+ if (rport) {
+ tgt_dbg(tgt, "rport add succeeded\n");
+ tgt->rport = rport;
+ rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
+ rport->supported_classes = 0;
+ tgt->target_id = rport->scsi_target_id;
+ if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
+ rport->supported_classes |= FC_COS_CLASS1;
+ if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
+ rport->supported_classes |= FC_COS_CLASS2;
+ if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
+ rport->supported_classes |= FC_COS_CLASS3;
+ if (rport->rqst_q)
+ blk_queue_max_segments(rport->rqst_q, 1);
+ } else
+ tgt_dbg(tgt, "rport add failed\n");
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+}
+
+/**
+ * ibmvfc_do_work - Do task level work
+ * @vhost: ibmvfc host struct
+ *
+ **/
+static void ibmvfc_do_work(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_target *tgt;
+ unsigned long flags;
+ struct fc_rport *rport;
+ int rc;
+
+ ibmvfc_log_ae(vhost, vhost->events_to_log);
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ vhost->events_to_log = 0;
+ switch (vhost->action) {
+ case IBMVFC_HOST_ACTION_NONE:
+ case IBMVFC_HOST_ACTION_LOGO_WAIT:
+ case IBMVFC_HOST_ACTION_INIT_WAIT:
+ break;
+ case IBMVFC_HOST_ACTION_RESET:
+ vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ rc = ibmvfc_reset_crq(vhost);
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ if (rc == H_CLOSED)
+ vio_enable_interrupts(to_vio_dev(vhost->dev));
+ if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
+ (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+ dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
+ }
+ break;
+ case IBMVFC_HOST_ACTION_REENABLE:
+ vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ rc = ibmvfc_reenable_crq_queue(vhost);
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
+ ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+ dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
+ }
+ break;
+ case IBMVFC_HOST_ACTION_LOGO:
+ vhost->job_step(vhost);
+ break;
+ case IBMVFC_HOST_ACTION_INIT:
+ BUG_ON(vhost->state != IBMVFC_INITIALIZING);
+ if (vhost->delay_init) {
+ vhost->delay_init = 0;
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ ssleep(15);
+ return;
+ } else
+ vhost->job_step(vhost);
+ break;
+ case IBMVFC_HOST_ACTION_QUERY:
+ list_for_each_entry(tgt, &vhost->targets, queue)
+ ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
+ break;
+ case IBMVFC_HOST_ACTION_QUERY_TGTS:
+ list_for_each_entry(tgt, &vhost->targets, queue) {
+ if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
+ tgt->job_step(tgt);
+ break;
+ }
+ }
+
+ if (!ibmvfc_dev_init_to_do(vhost))
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
+ break;
+ case IBMVFC_HOST_ACTION_TGT_DEL:
+ case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
+ list_for_each_entry(tgt, &vhost->targets, queue) {
+ if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
+ tgt_dbg(tgt, "Deleting rport\n");
+ rport = tgt->rport;
+ tgt->rport = NULL;
+ list_del(&tgt->queue);
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ if (rport)
+ fc_remote_port_delete(rport);
+ del_timer_sync(&tgt->timer);
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ return;
+ }
+ }
+
+ if (vhost->state == IBMVFC_INITIALIZING) {
+ if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
+ if (vhost->reinit) {
+ vhost->reinit = 0;
+ scsi_block_requests(vhost->host);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ } else {
+ ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
+ wake_up(&vhost->init_wait_q);
+ schedule_work(&vhost->rport_add_work_q);
+ vhost->init_retries = 0;
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ scsi_unblock_requests(vhost->host);
+ }
+
+ return;
+ } else {
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
+ vhost->job_step = ibmvfc_discover_targets;
+ }
+ } else {
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ scsi_unblock_requests(vhost->host);
+ wake_up(&vhost->init_wait_q);
+ return;
+ }
+ break;
+ case IBMVFC_HOST_ACTION_ALLOC_TGTS:
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ ibmvfc_alloc_targets(vhost);
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ break;
+ case IBMVFC_HOST_ACTION_TGT_INIT:
+ list_for_each_entry(tgt, &vhost->targets, queue) {
+ if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
+ tgt->job_step(tgt);
+ break;
+ }
+ }
+
+ if (!ibmvfc_dev_init_to_do(vhost))
+ ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
+ break;
+ default:
+ break;
+ }
+
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+}
+
+/**
+ * ibmvfc_work - Do task level work
+ * @data: ibmvfc host struct
+ *
+ * Returns:
+ * zero
+ **/
+static int ibmvfc_work(void *data)
+{
+ struct ibmvfc_host *vhost = data;
+ int rc;
+
+ set_user_nice(current, MIN_NICE);
+
+ while (1) {
+ rc = wait_event_interruptible(vhost->work_wait_q,
+ ibmvfc_work_to_do(vhost));
+
+ BUG_ON(rc);
+
+ if (kthread_should_stop())
+ break;
+
+ ibmvfc_do_work(vhost);
+ }
+
+ ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
+ return 0;
+}
+
+/**
+ * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
+ * @vhost: ibmvfc host struct
+ *
+ * Allocates a page for messages, maps it for dma, and registers
+ * the crq with the hypervisor.
+ *
+ * Return value:
+ * zero on success / other on failure
+ **/
+static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
+{
+ int rc, retrc = -ENOMEM;
+ struct device *dev = vhost->dev;
+ struct vio_dev *vdev = to_vio_dev(dev);
+ struct ibmvfc_crq_queue *crq = &vhost->crq;
+
+ ENTER;
+ crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
+
+ if (!crq->msgs)
+ return -ENOMEM;
+
+ crq->size = PAGE_SIZE / sizeof(*crq->msgs);
+ crq->msg_token = dma_map_single(dev, crq->msgs,
+ PAGE_SIZE, DMA_BIDIRECTIONAL);
+
+ if (dma_mapping_error(dev, crq->msg_token))
+ goto map_failed;
+
+ retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
+ crq->msg_token, PAGE_SIZE);
+
+ if (rc == H_RESOURCE)
+ /* maybe kexecing and resource is busy. try a reset */
+ retrc = rc = ibmvfc_reset_crq(vhost);
+
+ if (rc == H_CLOSED)
+ dev_warn(dev, "Partner adapter not ready\n");
+ else if (rc) {
+ dev_warn(dev, "Error %d opening adapter\n", rc);
+ goto reg_crq_failed;
+ }
+
+ retrc = 0;
+
+ tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
+
+ if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
+ dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
+ goto req_irq_failed;
+ }
+
+ if ((rc = vio_enable_interrupts(vdev))) {
+ dev_err(dev, "Error %d enabling interrupts\n", rc);
+ goto req_irq_failed;
+ }
+
+ crq->cur = 0;
+ LEAVE;
+ return retrc;
+
+req_irq_failed:
+ tasklet_kill(&vhost->tasklet);
+ do {
+ rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
+ } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
+reg_crq_failed:
+ dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
+map_failed:
+ free_page((unsigned long)crq->msgs);
+ return retrc;
+}
+
+/**
+ * ibmvfc_free_mem - Free memory for vhost
+ * @vhost: ibmvfc host struct
+ *
+ * Return value:
+ * none
+ **/
+static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
+
+ ENTER;
+ mempool_destroy(vhost->tgt_pool);
+ kfree(vhost->trace);
+ dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
+ vhost->disc_buf_dma);
+ dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
+ vhost->login_buf, vhost->login_buf_dma);
+ dma_pool_destroy(vhost->sg_pool);
+ dma_unmap_single(vhost->dev, async_q->msg_token,
+ async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
+ free_page((unsigned long)async_q->msgs);
+ LEAVE;
+}
+
+/**
+ * ibmvfc_alloc_mem - Allocate memory for vhost
+ * @vhost: ibmvfc host struct
+ *
+ * Return value:
+ * 0 on success / non-zero on failure
+ **/
+static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
+{
+ struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
+ struct device *dev = vhost->dev;
+
+ ENTER;
+ async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
+ if (!async_q->msgs) {
+ dev_err(dev, "Couldn't allocate async queue.\n");
+ goto nomem;
+ }
+
+ async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
+ async_q->msg_token = dma_map_single(dev, async_q->msgs,
+ async_q->size * sizeof(*async_q->msgs),
+ DMA_BIDIRECTIONAL);
+
+ if (dma_mapping_error(dev, async_q->msg_token)) {
+ dev_err(dev, "Failed to map async queue\n");
+ goto free_async_crq;
+ }
+
+ vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
+ SG_ALL * sizeof(struct srp_direct_buf),
+ sizeof(struct srp_direct_buf), 0);
+
+ if (!vhost->sg_pool) {
+ dev_err(dev, "Failed to allocate sg pool\n");
+ goto unmap_async_crq;
+ }
+
+ vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
+ &vhost->login_buf_dma, GFP_KERNEL);
+
+ if (!vhost->login_buf) {
+ dev_err(dev, "Couldn't allocate NPIV login buffer\n");
+ goto free_sg_pool;
+ }
+
+ vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
+ vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
+ &vhost->disc_buf_dma, GFP_KERNEL);
+
+ if (!vhost->disc_buf) {
+ dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
+ goto free_login_buffer;
+ }
+
+ vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
+ sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
+
+ if (!vhost->trace)
+ goto free_disc_buffer;
+
+ vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
+ sizeof(struct ibmvfc_target));
+
+ if (!vhost->tgt_pool) {
+ dev_err(dev, "Couldn't allocate target memory pool\n");
+ goto free_trace;
+ }
+
+ LEAVE;
+ return 0;
+
+free_trace:
+ kfree(vhost->trace);
+free_disc_buffer:
+ dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
+ vhost->disc_buf_dma);
+free_login_buffer:
+ dma_free_coherent(dev, sizeof(*vhost->login_buf),
+ vhost->login_buf, vhost->login_buf_dma);
+free_sg_pool:
+ dma_pool_destroy(vhost->sg_pool);
+unmap_async_crq:
+ dma_unmap_single(dev, async_q->msg_token,
+ async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
+free_async_crq:
+ free_page((unsigned long)async_q->msgs);
+nomem:
+ LEAVE;
+ return -ENOMEM;
+}
+
+/**
+ * ibmvfc_rport_add_thread - Worker thread for rport adds
+ * @work: work struct
+ *
+ **/
+static void ibmvfc_rport_add_thread(struct work_struct *work)
+{
+ struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
+ rport_add_work_q);
+ struct ibmvfc_target *tgt;
+ struct fc_rport *rport;
+ unsigned long flags;
+ int did_work;
+
+ ENTER;
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ do {
+ did_work = 0;
+ if (vhost->state != IBMVFC_ACTIVE)
+ break;
+
+ list_for_each_entry(tgt, &vhost->targets, queue) {
+ if (tgt->add_rport) {
+ did_work = 1;
+ tgt->add_rport = 0;
+ kref_get(&tgt->kref);
+ rport = tgt->rport;
+ if (!rport) {
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ ibmvfc_tgt_add_rport(tgt);
+ } else if (get_device(&rport->dev)) {
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ tgt_dbg(tgt, "Setting rport roles\n");
+ fc_remote_port_rolechg(rport, tgt->ids.roles);
+ put_device(&rport->dev);
+ } else {
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ }
+
+ kref_put(&tgt->kref, ibmvfc_release_tgt);
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ break;
+ }
+ }
+ } while(did_work);
+
+ if (vhost->state == IBMVFC_ACTIVE)
+ vhost->scan_complete = 1;
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ LEAVE;
+}
+
+/**
+ * ibmvfc_probe - Adapter hot plug add entry point
+ * @vdev: vio device struct
+ * @id: vio device id struct
+ *
+ * Return value:
+ * 0 on success / non-zero on failure
+ **/
+static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
+{
+ struct ibmvfc_host *vhost;
+ struct Scsi_Host *shost;
+ struct device *dev = &vdev->dev;
+ int rc = -ENOMEM;
+
+ ENTER;
+ shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
+ if (!shost) {
+ dev_err(dev, "Couldn't allocate host data\n");
+ goto out;
+ }
+
+ shost->transportt = ibmvfc_transport_template;
+ shost->can_queue = max_requests;
+ shost->max_lun = max_lun;
+ shost->max_id = max_targets;
+ shost->max_sectors = IBMVFC_MAX_SECTORS;
+ shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
+ shost->unique_id = shost->host_no;
+
+ vhost = shost_priv(shost);
+ INIT_LIST_HEAD(&vhost->sent);
+ INIT_LIST_HEAD(&vhost->free);
+ INIT_LIST_HEAD(&vhost->targets);
+ sprintf(vhost->name, IBMVFC_NAME);
+ vhost->host = shost;
+ vhost->dev = dev;
+ vhost->partition_number = -1;
+ vhost->log_level = log_level;
+ vhost->task_set = 1;
+ strcpy(vhost->partition_name, "UNKNOWN");
+ init_waitqueue_head(&vhost->work_wait_q);
+ init_waitqueue_head(&vhost->init_wait_q);
+ INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
+ mutex_init(&vhost->passthru_mutex);
+
+ if ((rc = ibmvfc_alloc_mem(vhost)))
+ goto free_scsi_host;
+
+ vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
+ shost->host_no);
+
+ if (IS_ERR(vhost->work_thread)) {
+ dev_err(dev, "Couldn't create kernel thread: %ld\n",
+ PTR_ERR(vhost->work_thread));
+ goto free_host_mem;
+ }
+
+ if ((rc = ibmvfc_init_crq(vhost))) {
+ dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
+ goto kill_kthread;
+ }
+
+ if ((rc = ibmvfc_init_event_pool(vhost))) {
+ dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
+ goto release_crq;
+ }
+
+ if ((rc = scsi_add_host(shost, dev)))
+ goto release_event_pool;
+
+ fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
+
+ if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
+ &ibmvfc_trace_attr))) {
+ dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
+ goto remove_shost;
+ }
+
+ if (shost_to_fc_host(shost)->rqst_q)
+ blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
+ dev_set_drvdata(dev, vhost);
+ spin_lock(&ibmvfc_driver_lock);
+ list_add_tail(&vhost->queue, &ibmvfc_head);
+ spin_unlock(&ibmvfc_driver_lock);
+
+ ibmvfc_send_crq_init(vhost);
+ scsi_scan_host(shost);
+ return 0;
+
+remove_shost:
+ scsi_remove_host(shost);
+release_event_pool:
+ ibmvfc_free_event_pool(vhost);
+release_crq:
+ ibmvfc_release_crq_queue(vhost);
+kill_kthread:
+ kthread_stop(vhost->work_thread);
+free_host_mem:
+ ibmvfc_free_mem(vhost);
+free_scsi_host:
+ scsi_host_put(shost);
+out:
+ LEAVE;
+ return rc;
+}
+
+/**
+ * ibmvfc_remove - Adapter hot plug remove entry point
+ * @vdev: vio device struct
+ *
+ * Return value:
+ * 0
+ **/
+static int ibmvfc_remove(struct vio_dev *vdev)
+{
+ struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
+ unsigned long flags;
+
+ ENTER;
+ ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ ibmvfc_wait_while_resetting(vhost);
+ ibmvfc_release_crq_queue(vhost);
+ kthread_stop(vhost->work_thread);
+ fc_remove_host(vhost->host);
+ scsi_remove_host(vhost->host);
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ ibmvfc_purge_requests(vhost, DID_ERROR);
+ ibmvfc_free_event_pool(vhost);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+ ibmvfc_free_mem(vhost);
+ spin_lock(&ibmvfc_driver_lock);
+ list_del(&vhost->queue);
+ spin_unlock(&ibmvfc_driver_lock);
+ scsi_host_put(vhost->host);
+ LEAVE;
+ return 0;
+}
+
+/**
+ * ibmvfc_resume - Resume from suspend
+ * @dev: device struct
+ *
+ * We may have lost an interrupt across suspend/resume, so kick the
+ * interrupt handler
+ *
+ */
+static int ibmvfc_resume(struct device *dev)
+{
+ unsigned long flags;
+ struct ibmvfc_host *vhost = dev_get_drvdata(dev);
+ struct vio_dev *vdev = to_vio_dev(dev);
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ vio_disable_interrupts(vdev);
+ tasklet_schedule(&vhost->tasklet);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return 0;
+}
+
+/**
+ * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
+ * @vdev: vio device struct
+ *
+ * Return value:
+ * Number of bytes the driver will need to DMA map at the same time in
+ * order to perform well.
+ */
+static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
+{
+ unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
+ return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
+}
+
+static const struct vio_device_id ibmvfc_device_table[] = {
+ {"fcp", "IBM,vfc-client"},
+ { "", "" }
+};
+MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
+
+static const struct dev_pm_ops ibmvfc_pm_ops = {
+ .resume = ibmvfc_resume
+};
+
+static struct vio_driver ibmvfc_driver = {
+ .id_table = ibmvfc_device_table,
+ .probe = ibmvfc_probe,
+ .remove = ibmvfc_remove,
+ .get_desired_dma = ibmvfc_get_desired_dma,
+ .name = IBMVFC_NAME,
+ .pm = &ibmvfc_pm_ops,
+};
+
+static struct fc_function_template ibmvfc_transport_functions = {
+ .show_host_fabric_name = 1,
+ .show_host_node_name = 1,
+ .show_host_port_name = 1,
+ .show_host_supported_classes = 1,
+ .show_host_port_type = 1,
+ .show_host_port_id = 1,
+ .show_host_maxframe_size = 1,
+
+ .get_host_port_state = ibmvfc_get_host_port_state,
+ .show_host_port_state = 1,
+
+ .get_host_speed = ibmvfc_get_host_speed,
+ .show_host_speed = 1,
+
+ .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
+ .terminate_rport_io = ibmvfc_terminate_rport_io,
+
+ .show_rport_maxframe_size = 1,
+ .show_rport_supported_classes = 1,
+
+ .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
+ .show_rport_dev_loss_tmo = 1,
+
+ .get_starget_node_name = ibmvfc_get_starget_node_name,
+ .show_starget_node_name = 1,
+
+ .get_starget_port_name = ibmvfc_get_starget_port_name,
+ .show_starget_port_name = 1,
+
+ .get_starget_port_id = ibmvfc_get_starget_port_id,
+ .show_starget_port_id = 1,
+
+ .bsg_request = ibmvfc_bsg_request,
+ .bsg_timeout = ibmvfc_bsg_timeout,
+};
+
+/**
+ * ibmvfc_module_init - Initialize the ibmvfc module
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int __init ibmvfc_module_init(void)
+{
+ int rc;
+
+ if (!firmware_has_feature(FW_FEATURE_VIO))
+ return -ENODEV;
+
+ printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
+ IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
+
+ ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
+ if (!ibmvfc_transport_template)
+ return -ENOMEM;
+
+ rc = vio_register_driver(&ibmvfc_driver);
+ if (rc)
+ fc_release_transport(ibmvfc_transport_template);
+ return rc;
+}
+
+/**
+ * ibmvfc_module_exit - Teardown the ibmvfc module
+ *
+ * Return value:
+ * nothing
+ **/
+static void __exit ibmvfc_module_exit(void)
+{
+ vio_unregister_driver(&ibmvfc_driver);
+ fc_release_transport(ibmvfc_transport_template);
+}
+
+module_init(ibmvfc_module_init);
+module_exit(ibmvfc_module_exit);
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
new file mode 100644
index 0000000..b81a53c
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h
@@ -0,0 +1,776 @@
+/*
+ * ibmvfc.h -- driver for IBM Power Virtual Fibre Channel Adapter
+ *
+ * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
+ *
+ * Copyright (C) IBM Corporation, 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#ifndef _IBMVFC_H
+#define _IBMVFC_H
+
+#include <linux/list.h>
+#include <linux/types.h>
+#include <scsi/viosrp.h>
+
+#define IBMVFC_NAME "ibmvfc"
+#define IBMVFC_DRIVER_VERSION "1.0.11"
+#define IBMVFC_DRIVER_DATE "(April 12, 2013)"
+
+#define IBMVFC_DEFAULT_TIMEOUT 60
+#define IBMVFC_ADISC_CANCEL_TIMEOUT 45
+#define IBMVFC_ADISC_TIMEOUT 15
+#define IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT \
+ (IBMVFC_ADISC_TIMEOUT + IBMVFC_ADISC_CANCEL_TIMEOUT)
+#define IBMVFC_INIT_TIMEOUT 120
+#define IBMVFC_ABORT_TIMEOUT 8
+#define IBMVFC_ABORT_WAIT_TIMEOUT 40
+#define IBMVFC_MAX_REQUESTS_DEFAULT 100
+
+#define IBMVFC_DEBUG 0
+#define IBMVFC_MAX_TARGETS 1024
+#define IBMVFC_MAX_LUN 0xffffffff
+#define IBMVFC_MAX_SECTORS 0xffffu
+#define IBMVFC_MAX_DISC_THREADS 4
+#define IBMVFC_TGT_MEMPOOL_SZ 64
+#define IBMVFC_MAX_CMDS_PER_LUN 64
+#define IBMVFC_MAX_HOST_INIT_RETRIES 6
+#define IBMVFC_MAX_TGT_INIT_RETRIES 3
+#define IBMVFC_DEV_LOSS_TMO (5 * 60)
+#define IBMVFC_DEFAULT_LOG_LEVEL 2
+#define IBMVFC_MAX_CDB_LEN 16
+#define IBMVFC_CLS3_ERROR 0
+
+/*
+ * Ensure we have resources for ERP and initialization:
+ * 1 for ERP
+ * 1 for initialization
+ * 1 for NPIV Logout
+ * 2 for BSG passthru
+ * 2 for each discovery thread
+ */
+#define IBMVFC_NUM_INTERNAL_REQ (1 + 1 + 1 + 2 + (disc_threads * 2))
+
+#define IBMVFC_MAD_SUCCESS 0x00
+#define IBMVFC_MAD_NOT_SUPPORTED 0xF1
+#define IBMVFC_MAD_FAILED 0xF7
+#define IBMVFC_MAD_DRIVER_FAILED 0xEE
+#define IBMVFC_MAD_CRQ_ERROR 0xEF
+
+enum ibmvfc_crq_valid {
+ IBMVFC_CRQ_CMD_RSP = 0x80,
+ IBMVFC_CRQ_INIT_RSP = 0xC0,
+ IBMVFC_CRQ_XPORT_EVENT = 0xFF,
+};
+
+enum ibmvfc_crq_format {
+ IBMVFC_CRQ_INIT = 0x01,
+ IBMVFC_CRQ_INIT_COMPLETE = 0x02,
+ IBMVFC_PARTITION_MIGRATED = 0x06,
+};
+
+enum ibmvfc_cmd_status_flags {
+ IBMVFC_FABRIC_MAPPED = 0x0001,
+ IBMVFC_VIOS_FAILURE = 0x0002,
+ IBMVFC_FC_FAILURE = 0x0004,
+ IBMVFC_FC_SCSI_ERROR = 0x0008,
+ IBMVFC_HW_EVENT_LOGGED = 0x0010,
+ IBMVFC_VIOS_LOGGED = 0x0020,
+};
+
+enum ibmvfc_fabric_mapped_errors {
+ IBMVFC_UNABLE_TO_ESTABLISH = 0x0001,
+ IBMVFC_XPORT_FAULT = 0x0002,
+ IBMVFC_CMD_TIMEOUT = 0x0003,
+ IBMVFC_ENETDOWN = 0x0004,
+ IBMVFC_HW_FAILURE = 0x0005,
+ IBMVFC_LINK_DOWN_ERR = 0x0006,
+ IBMVFC_LINK_DEAD_ERR = 0x0007,
+ IBMVFC_UNABLE_TO_REGISTER = 0x0008,
+ IBMVFC_XPORT_BUSY = 0x000A,
+ IBMVFC_XPORT_DEAD = 0x000B,
+ IBMVFC_CONFIG_ERROR = 0x000C,
+ IBMVFC_NAME_SERVER_FAIL = 0x000D,
+ IBMVFC_LINK_HALTED = 0x000E,
+ IBMVFC_XPORT_GENERAL = 0x8000,
+};
+
+enum ibmvfc_vios_errors {
+ IBMVFC_CRQ_FAILURE = 0x0001,
+ IBMVFC_SW_FAILURE = 0x0002,
+ IBMVFC_INVALID_PARAMETER = 0x0003,
+ IBMVFC_MISSING_PARAMETER = 0x0004,
+ IBMVFC_HOST_IO_BUS = 0x0005,
+ IBMVFC_TRANS_CANCELLED = 0x0006,
+ IBMVFC_TRANS_CANCELLED_IMPLICIT = 0x0007,
+ IBMVFC_INSUFFICIENT_RESOURCE = 0x0008,
+ IBMVFC_PLOGI_REQUIRED = 0x0010,
+ IBMVFC_COMMAND_FAILED = 0x8000,
+};
+
+enum ibmvfc_mad_types {
+ IBMVFC_NPIV_LOGIN = 0x0001,
+ IBMVFC_DISC_TARGETS = 0x0002,
+ IBMVFC_PORT_LOGIN = 0x0004,
+ IBMVFC_PROCESS_LOGIN = 0x0008,
+ IBMVFC_QUERY_TARGET = 0x0010,
+ IBMVFC_IMPLICIT_LOGOUT = 0x0040,
+ IBMVFC_PASSTHRU = 0x0200,
+ IBMVFC_TMF_MAD = 0x0100,
+ IBMVFC_NPIV_LOGOUT = 0x0800,
+};
+
+struct ibmvfc_mad_common {
+ __be32 version;
+ __be32 reserved;
+ __be32 opcode;
+ __be16 status;
+ __be16 length;
+ __be64 tag;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_npiv_login_mad {
+ struct ibmvfc_mad_common common;
+ struct srp_direct_buf buffer;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_npiv_logout_mad {
+ struct ibmvfc_mad_common common;
+}__attribute__((packed, aligned (8)));
+
+#define IBMVFC_MAX_NAME 256
+
+struct ibmvfc_npiv_login {
+ __be32 ostype;
+#define IBMVFC_OS_LINUX 0x02
+ __be32 pad;
+ __be64 max_dma_len;
+ __be32 max_payload;
+ __be32 max_response;
+ __be32 partition_num;
+ __be32 vfc_frame_version;
+ __be16 fcp_version;
+ __be16 flags;
+#define IBMVFC_CLIENT_MIGRATED 0x01
+#define IBMVFC_FLUSH_ON_HALT 0x02
+ __be32 max_cmds;
+ __be64 capabilities;
+#define IBMVFC_CAN_MIGRATE 0x01
+ __be64 node_name;
+ struct srp_direct_buf async;
+ u8 partition_name[IBMVFC_MAX_NAME];
+ u8 device_name[IBMVFC_MAX_NAME];
+ u8 drc_name[IBMVFC_MAX_NAME];
+ __be64 reserved2[2];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_common_svc_parms {
+ __be16 fcph_version;
+ __be16 b2b_credit;
+ __be16 features;
+ __be16 bb_rcv_sz; /* upper nibble is BB_SC_N */
+ __be32 ratov;
+ __be32 edtov;
+}__attribute__((packed, aligned (4)));
+
+struct ibmvfc_service_parms {
+ struct ibmvfc_common_svc_parms common;
+ u8 port_name[8];
+ u8 node_name[8];
+ __be32 class1_parms[4];
+ __be32 class2_parms[4];
+ __be32 class3_parms[4];
+ __be32 obsolete[4];
+ __be32 vendor_version[4];
+ __be32 services_avail[2];
+ __be32 ext_len;
+ __be32 reserved[30];
+ __be32 clk_sync_qos[2];
+}__attribute__((packed, aligned (4)));
+
+struct ibmvfc_npiv_login_resp {
+ __be32 version;
+ __be16 status;
+ __be16 error;
+ __be32 flags;
+#define IBMVFC_NATIVE_FC 0x01
+ __be32 reserved;
+ __be64 capabilities;
+#define IBMVFC_CAN_FLUSH_ON_HALT 0x08
+#define IBMVFC_CAN_SUPPRESS_ABTS 0x10
+ __be32 max_cmds;
+ __be32 scsi_id_sz;
+ __be64 max_dma_len;
+ __be64 scsi_id;
+ __be64 port_name;
+ __be64 node_name;
+ __be64 link_speed;
+ u8 partition_name[IBMVFC_MAX_NAME];
+ u8 device_name[IBMVFC_MAX_NAME];
+ u8 port_loc_code[IBMVFC_MAX_NAME];
+ u8 drc_name[IBMVFC_MAX_NAME];
+ struct ibmvfc_service_parms service_parms;
+ __be64 reserved2;
+}__attribute__((packed, aligned (8)));
+
+union ibmvfc_npiv_login_data {
+ struct ibmvfc_npiv_login login;
+ struct ibmvfc_npiv_login_resp resp;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_discover_targets_buf {
+ __be32 scsi_id[1];
+#define IBMVFC_DISC_TGT_SCSI_ID_MASK 0x00ffffff
+};
+
+struct ibmvfc_discover_targets {
+ struct ibmvfc_mad_common common;
+ struct srp_direct_buf buffer;
+ __be32 flags;
+ __be16 status;
+ __be16 error;
+ __be32 bufflen;
+ __be32 num_avail;
+ __be32 num_written;
+ __be64 reserved[2];
+}__attribute__((packed, aligned (8)));
+
+enum ibmvfc_fc_reason {
+ IBMVFC_INVALID_ELS_CMD_CODE = 0x01,
+ IBMVFC_INVALID_VERSION = 0x02,
+ IBMVFC_LOGICAL_ERROR = 0x03,
+ IBMVFC_INVALID_CT_IU_SIZE = 0x04,
+ IBMVFC_LOGICAL_BUSY = 0x05,
+ IBMVFC_PROTOCOL_ERROR = 0x07,
+ IBMVFC_UNABLE_TO_PERFORM_REQ = 0x09,
+ IBMVFC_CMD_NOT_SUPPORTED = 0x0B,
+ IBMVFC_SERVER_NOT_AVAIL = 0x0D,
+ IBMVFC_CMD_IN_PROGRESS = 0x0E,
+ IBMVFC_VENDOR_SPECIFIC = 0xFF,
+};
+
+enum ibmvfc_fc_type {
+ IBMVFC_FABRIC_REJECT = 0x01,
+ IBMVFC_PORT_REJECT = 0x02,
+ IBMVFC_LS_REJECT = 0x03,
+ IBMVFC_FABRIC_BUSY = 0x04,
+ IBMVFC_PORT_BUSY = 0x05,
+ IBMVFC_BASIC_REJECT = 0x06,
+};
+
+enum ibmvfc_gs_explain {
+ IBMVFC_PORT_NAME_NOT_REG = 0x02,
+};
+
+struct ibmvfc_port_login {
+ struct ibmvfc_mad_common common;
+ __be64 scsi_id;
+ __be16 reserved;
+ __be16 fc_service_class;
+ __be32 blksz;
+ __be32 hdr_per_blk;
+ __be16 status;
+ __be16 error; /* also fc_reason */
+ __be16 fc_explain;
+ __be16 fc_type;
+ __be32 reserved2;
+ struct ibmvfc_service_parms service_parms;
+ struct ibmvfc_service_parms service_parms_change;
+ __be64 reserved3[2];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_prli_svc_parms {
+ u8 type;
+#define IBMVFC_SCSI_FCP_TYPE 0x08
+ u8 type_ext;
+ __be16 flags;
+#define IBMVFC_PRLI_ORIG_PA_VALID 0x8000
+#define IBMVFC_PRLI_RESP_PA_VALID 0x4000
+#define IBMVFC_PRLI_EST_IMG_PAIR 0x2000
+ __be32 orig_pa;
+ __be32 resp_pa;
+ __be32 service_parms;
+#define IBMVFC_PRLI_TASK_RETRY 0x00000200
+#define IBMVFC_PRLI_RETRY 0x00000100
+#define IBMVFC_PRLI_DATA_OVERLAY 0x00000040
+#define IBMVFC_PRLI_INITIATOR_FUNC 0x00000020
+#define IBMVFC_PRLI_TARGET_FUNC 0x00000010
+#define IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED 0x00000002
+#define IBMVFC_PRLI_WR_FCP_XFER_RDY_DISABLED 0x00000001
+}__attribute__((packed, aligned (4)));
+
+struct ibmvfc_process_login {
+ struct ibmvfc_mad_common common;
+ __be64 scsi_id;
+ struct ibmvfc_prli_svc_parms parms;
+ u8 reserved[48];
+ __be16 status;
+ __be16 error; /* also fc_reason */
+ __be32 reserved2;
+ __be64 reserved3[2];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_query_tgt {
+ struct ibmvfc_mad_common common;
+ __be64 wwpn;
+ __be64 scsi_id;
+ __be16 status;
+ __be16 error;
+ __be16 fc_explain;
+ __be16 fc_type;
+ __be64 reserved[2];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_implicit_logout {
+ struct ibmvfc_mad_common common;
+ __be64 old_scsi_id;
+ __be64 reserved[2];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_tmf {
+ struct ibmvfc_mad_common common;
+ __be64 scsi_id;
+ struct scsi_lun lun;
+ __be32 flags;
+#define IBMVFC_TMF_ABORT_TASK 0x02
+#define IBMVFC_TMF_ABORT_TASK_SET 0x04
+#define IBMVFC_TMF_LUN_RESET 0x10
+#define IBMVFC_TMF_TGT_RESET 0x20
+#define IBMVFC_TMF_LUA_VALID 0x40
+#define IBMVFC_TMF_SUPPRESS_ABTS 0x80
+ __be32 cancel_key;
+ __be32 my_cancel_key;
+ __be32 pad;
+ __be64 reserved[2];
+}__attribute__((packed, aligned (8)));
+
+enum ibmvfc_fcp_rsp_info_codes {
+ RSP_NO_FAILURE = 0x00,
+ RSP_TMF_REJECTED = 0x04,
+ RSP_TMF_FAILED = 0x05,
+ RSP_TMF_INVALID_LUN = 0x09,
+};
+
+struct ibmvfc_fcp_rsp_info {
+ u8 reserved[3];
+ u8 rsp_code;
+ u8 reserved2[4];
+}__attribute__((packed, aligned (2)));
+
+enum ibmvfc_fcp_rsp_flags {
+ FCP_BIDI_RSP = 0x80,
+ FCP_BIDI_READ_RESID_UNDER = 0x40,
+ FCP_BIDI_READ_RESID_OVER = 0x20,
+ FCP_CONF_REQ = 0x10,
+ FCP_RESID_UNDER = 0x08,
+ FCP_RESID_OVER = 0x04,
+ FCP_SNS_LEN_VALID = 0x02,
+ FCP_RSP_LEN_VALID = 0x01,
+};
+
+union ibmvfc_fcp_rsp_data {
+ struct ibmvfc_fcp_rsp_info info;
+ u8 sense[SCSI_SENSE_BUFFERSIZE + sizeof(struct ibmvfc_fcp_rsp_info)];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_fcp_rsp {
+ __be64 reserved;
+ __be16 retry_delay_timer;
+ u8 flags;
+ u8 scsi_status;
+ __be32 fcp_resid;
+ __be32 fcp_sense_len;
+ __be32 fcp_rsp_len;
+ union ibmvfc_fcp_rsp_data data;
+}__attribute__((packed, aligned (8)));
+
+enum ibmvfc_cmd_flags {
+ IBMVFC_SCATTERLIST = 0x0001,
+ IBMVFC_NO_MEM_DESC = 0x0002,
+ IBMVFC_READ = 0x0004,
+ IBMVFC_WRITE = 0x0008,
+ IBMVFC_TMF = 0x0080,
+ IBMVFC_CLASS_3_ERR = 0x0100,
+};
+
+enum ibmvfc_fc_task_attr {
+ IBMVFC_SIMPLE_TASK = 0x00,
+ IBMVFC_HEAD_OF_QUEUE = 0x01,
+ IBMVFC_ORDERED_TASK = 0x02,
+ IBMVFC_ACA_TASK = 0x04,
+};
+
+enum ibmvfc_fc_tmf_flags {
+ IBMVFC_ABORT_TASK_SET = 0x02,
+ IBMVFC_LUN_RESET = 0x10,
+ IBMVFC_TARGET_RESET = 0x20,
+};
+
+struct ibmvfc_fcp_cmd_iu {
+ struct scsi_lun lun;
+ u8 crn;
+ u8 pri_task_attr;
+ u8 tmf_flags;
+ u8 add_cdb_len;
+#define IBMVFC_RDDATA 0x02
+#define IBMVFC_WRDATA 0x01
+ u8 cdb[IBMVFC_MAX_CDB_LEN];
+ __be32 xfer_len;
+}__attribute__((packed, aligned (4)));
+
+struct ibmvfc_cmd {
+ __be64 task_tag;
+ __be32 frame_type;
+ __be32 payload_len;
+ __be32 resp_len;
+ __be32 adapter_resid;
+ __be16 status;
+ __be16 error;
+ __be16 flags;
+ __be16 response_flags;
+#define IBMVFC_ADAPTER_RESID_VALID 0x01
+ __be32 cancel_key;
+ __be32 exchange_id;
+ struct srp_direct_buf ext_func;
+ struct srp_direct_buf ioba;
+ struct srp_direct_buf resp;
+ __be64 correlation;
+ __be64 tgt_scsi_id;
+ __be64 tag;
+ __be64 reserved3[2];
+ struct ibmvfc_fcp_cmd_iu iu;
+ struct ibmvfc_fcp_rsp rsp;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_passthru_fc_iu {
+ __be32 payload[7];
+#define IBMVFC_ADISC 0x52000000
+ __be32 response[7];
+};
+
+struct ibmvfc_passthru_iu {
+ __be64 task_tag;
+ __be32 cmd_len;
+ __be32 rsp_len;
+ __be16 status;
+ __be16 error;
+ __be32 flags;
+#define IBMVFC_FC_ELS 0x01
+#define IBMVFC_FC_CT_IU 0x02
+ __be32 cancel_key;
+#define IBMVFC_PASSTHRU_CANCEL_KEY 0x80000000
+#define IBMVFC_INTERNAL_CANCEL_KEY 0x80000001
+ __be32 reserved;
+ struct srp_direct_buf cmd;
+ struct srp_direct_buf rsp;
+ __be64 correlation;
+ __be64 scsi_id;
+ __be64 tag;
+ __be64 reserved2[2];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_passthru_mad {
+ struct ibmvfc_mad_common common;
+ struct srp_direct_buf cmd_ioba;
+ struct ibmvfc_passthru_iu iu;
+ struct ibmvfc_passthru_fc_iu fc_iu;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_trace_start_entry {
+ u32 xfer_len;
+}__attribute__((packed));
+
+struct ibmvfc_trace_end_entry {
+ u16 status;
+ u16 error;
+ u8 fcp_rsp_flags;
+ u8 rsp_code;
+ u8 scsi_status;
+ u8 reserved;
+}__attribute__((packed));
+
+struct ibmvfc_trace_entry {
+ struct ibmvfc_event *evt;
+ u32 time;
+ u32 scsi_id;
+ u32 lun;
+ u8 fmt;
+ u8 op_code;
+ u8 tmf_flags;
+ u8 type;
+#define IBMVFC_TRC_START 0x00
+#define IBMVFC_TRC_END 0xff
+ union {
+ struct ibmvfc_trace_start_entry start;
+ struct ibmvfc_trace_end_entry end;
+ } u;
+}__attribute__((packed, aligned (8)));
+
+enum ibmvfc_crq_formats {
+ IBMVFC_CMD_FORMAT = 0x01,
+ IBMVFC_ASYNC_EVENT = 0x02,
+ IBMVFC_MAD_FORMAT = 0x04,
+};
+
+enum ibmvfc_async_event {
+ IBMVFC_AE_ELS_PLOGI = 0x0001,
+ IBMVFC_AE_ELS_LOGO = 0x0002,
+ IBMVFC_AE_ELS_PRLO = 0x0004,
+ IBMVFC_AE_SCN_NPORT = 0x0008,
+ IBMVFC_AE_SCN_GROUP = 0x0010,
+ IBMVFC_AE_SCN_DOMAIN = 0x0020,
+ IBMVFC_AE_SCN_FABRIC = 0x0040,
+ IBMVFC_AE_LINK_UP = 0x0080,
+ IBMVFC_AE_LINK_DOWN = 0x0100,
+ IBMVFC_AE_LINK_DEAD = 0x0200,
+ IBMVFC_AE_HALT = 0x0400,
+ IBMVFC_AE_RESUME = 0x0800,
+ IBMVFC_AE_ADAPTER_FAILED = 0x1000,
+};
+
+struct ibmvfc_async_desc {
+ const char *desc;
+ enum ibmvfc_async_event ae;
+ int log_level;
+};
+
+struct ibmvfc_crq {
+ volatile u8 valid;
+ volatile u8 format;
+ u8 reserved[6];
+ volatile __be64 ioba;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_crq_queue {
+ struct ibmvfc_crq *msgs;
+ int size, cur;
+ dma_addr_t msg_token;
+};
+
+enum ibmvfc_ae_link_state {
+ IBMVFC_AE_LS_LINK_UP = 0x01,
+ IBMVFC_AE_LS_LINK_BOUNCED = 0x02,
+ IBMVFC_AE_LS_LINK_DOWN = 0x04,
+ IBMVFC_AE_LS_LINK_DEAD = 0x08,
+};
+
+struct ibmvfc_async_crq {
+ volatile u8 valid;
+ u8 link_state;
+ u8 pad[2];
+ __be32 pad2;
+ volatile __be64 event;
+ volatile __be64 scsi_id;
+ volatile __be64 wwpn;
+ volatile __be64 node_name;
+ __be64 reserved;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_async_crq_queue {
+ struct ibmvfc_async_crq *msgs;
+ int size, cur;
+ dma_addr_t msg_token;
+};
+
+union ibmvfc_iu {
+ struct ibmvfc_mad_common mad_common;
+ struct ibmvfc_npiv_login_mad npiv_login;
+ struct ibmvfc_npiv_logout_mad npiv_logout;
+ struct ibmvfc_discover_targets discover_targets;
+ struct ibmvfc_port_login plogi;
+ struct ibmvfc_process_login prli;
+ struct ibmvfc_query_tgt query_tgt;
+ struct ibmvfc_implicit_logout implicit_logout;
+ struct ibmvfc_tmf tmf;
+ struct ibmvfc_cmd cmd;
+ struct ibmvfc_passthru_mad passthru;
+}__attribute__((packed, aligned (8)));
+
+enum ibmvfc_target_action {
+ IBMVFC_TGT_ACTION_NONE = 0,
+ IBMVFC_TGT_ACTION_INIT,
+ IBMVFC_TGT_ACTION_INIT_WAIT,
+ IBMVFC_TGT_ACTION_DEL_RPORT,
+ IBMVFC_TGT_ACTION_DELETED_RPORT,
+};
+
+struct ibmvfc_target {
+ struct list_head queue;
+ struct ibmvfc_host *vhost;
+ u64 scsi_id;
+ u64 new_scsi_id;
+ struct fc_rport *rport;
+ int target_id;
+ enum ibmvfc_target_action action;
+ int need_login;
+ int add_rport;
+ int init_retries;
+ int logo_rcvd;
+ u32 cancel_key;
+ struct ibmvfc_service_parms service_parms;
+ struct ibmvfc_service_parms service_parms_change;
+ struct fc_rport_identifiers ids;
+ void (*job_step) (struct ibmvfc_target *);
+ struct timer_list timer;
+ struct kref kref;
+};
+
+/* a unit of work for the hosting partition */
+struct ibmvfc_event {
+ struct list_head queue;
+ struct ibmvfc_host *vhost;
+ struct ibmvfc_target *tgt;
+ struct scsi_cmnd *cmnd;
+ atomic_t free;
+ union ibmvfc_iu *xfer_iu;
+ void (*done) (struct ibmvfc_event *);
+ struct ibmvfc_crq crq;
+ union ibmvfc_iu iu;
+ union ibmvfc_iu *sync_iu;
+ struct srp_direct_buf *ext_list;
+ dma_addr_t ext_list_token;
+ struct completion comp;
+ struct completion *eh_comp;
+ struct timer_list timer;
+};
+
+/* a pool of event structs for use */
+struct ibmvfc_event_pool {
+ struct ibmvfc_event *events;
+ u32 size;
+ union ibmvfc_iu *iu_storage;
+ dma_addr_t iu_token;
+};
+
+enum ibmvfc_host_action {
+ IBMVFC_HOST_ACTION_NONE = 0,
+ IBMVFC_HOST_ACTION_RESET,
+ IBMVFC_HOST_ACTION_REENABLE,
+ IBMVFC_HOST_ACTION_LOGO,
+ IBMVFC_HOST_ACTION_LOGO_WAIT,
+ IBMVFC_HOST_ACTION_INIT,
+ IBMVFC_HOST_ACTION_INIT_WAIT,
+ IBMVFC_HOST_ACTION_QUERY,
+ IBMVFC_HOST_ACTION_QUERY_TGTS,
+ IBMVFC_HOST_ACTION_TGT_DEL,
+ IBMVFC_HOST_ACTION_ALLOC_TGTS,
+ IBMVFC_HOST_ACTION_TGT_INIT,
+ IBMVFC_HOST_ACTION_TGT_DEL_FAILED,
+};
+
+enum ibmvfc_host_state {
+ IBMVFC_NO_CRQ = 0,
+ IBMVFC_INITIALIZING,
+ IBMVFC_ACTIVE,
+ IBMVFC_HALTED,
+ IBMVFC_LINK_DOWN,
+ IBMVFC_LINK_DEAD,
+ IBMVFC_HOST_OFFLINE,
+};
+
+struct ibmvfc_host {
+ char name[8];
+ struct list_head queue;
+ struct Scsi_Host *host;
+ enum ibmvfc_host_state state;
+ enum ibmvfc_host_action action;
+#define IBMVFC_NUM_TRACE_INDEX_BITS 8
+#define IBMVFC_NUM_TRACE_ENTRIES (1 << IBMVFC_NUM_TRACE_INDEX_BITS)
+#define IBMVFC_TRACE_SIZE (sizeof(struct ibmvfc_trace_entry) * IBMVFC_NUM_TRACE_ENTRIES)
+ struct ibmvfc_trace_entry *trace;
+ u32 trace_index:IBMVFC_NUM_TRACE_INDEX_BITS;
+ int num_targets;
+ struct list_head targets;
+ struct list_head sent;
+ struct list_head free;
+ struct device *dev;
+ struct ibmvfc_event_pool pool;
+ struct dma_pool *sg_pool;
+ mempool_t *tgt_pool;
+ struct ibmvfc_crq_queue crq;
+ struct ibmvfc_async_crq_queue async_crq;
+ struct ibmvfc_npiv_login login_info;
+ union ibmvfc_npiv_login_data *login_buf;
+ dma_addr_t login_buf_dma;
+ int disc_buf_sz;
+ int log_level;
+ struct ibmvfc_discover_targets_buf *disc_buf;
+ struct mutex passthru_mutex;
+ int task_set;
+ int init_retries;
+ int discovery_threads;
+ int abort_threads;
+ int client_migrated;
+ int reinit;
+ int delay_init;
+ int scan_complete;
+ int logged_in;
+ int aborting_passthru;
+ int events_to_log;
+#define IBMVFC_AE_LINKUP 0x0001
+#define IBMVFC_AE_LINKDOWN 0x0002
+#define IBMVFC_AE_RSCN 0x0004
+ dma_addr_t disc_buf_dma;
+ unsigned int partition_number;
+ char partition_name[97];
+ void (*job_step) (struct ibmvfc_host *);
+ struct task_struct *work_thread;
+ struct tasklet_struct tasklet;
+ struct work_struct rport_add_work_q;
+ wait_queue_head_t init_wait_q;
+ wait_queue_head_t work_wait_q;
+};
+
+#define DBG_CMD(CMD) do { if (ibmvfc_debug) CMD; } while (0)
+
+#define tgt_dbg(t, fmt, ...) \
+ DBG_CMD(dev_info((t)->vhost->dev, "%llX: " fmt, (t)->scsi_id, ##__VA_ARGS__))
+
+#define tgt_info(t, fmt, ...) \
+ dev_info((t)->vhost->dev, "%llX: " fmt, (t)->scsi_id, ##__VA_ARGS__)
+
+#define tgt_err(t, fmt, ...) \
+ dev_err((t)->vhost->dev, "%llX: " fmt, (t)->scsi_id, ##__VA_ARGS__)
+
+#define tgt_log(t, level, fmt, ...) \
+ do { \
+ if ((t)->vhost->log_level >= level) \
+ tgt_err(t, fmt, ##__VA_ARGS__); \
+ } while (0)
+
+#define ibmvfc_dbg(vhost, ...) \
+ DBG_CMD(dev_info((vhost)->dev, ##__VA_ARGS__))
+
+#define ibmvfc_log(vhost, level, ...) \
+ do { \
+ if ((vhost)->log_level >= level) \
+ dev_err((vhost)->dev, ##__VA_ARGS__); \
+ } while (0)
+
+#define ENTER DBG_CMD(printk(KERN_INFO IBMVFC_NAME": Entering %s\n", __func__))
+#define LEAVE DBG_CMD(printk(KERN_INFO IBMVFC_NAME": Leaving %s\n", __func__))
+
+#ifdef CONFIG_SCSI_IBMVFC_TRACE
+#define ibmvfc_create_trace_file(kobj, attr) sysfs_create_bin_file(kobj, attr)
+#define ibmvfc_remove_trace_file(kobj, attr) sysfs_remove_bin_file(kobj, attr)
+#else
+#define ibmvfc_create_trace_file(kobj, attr) 0
+#define ibmvfc_remove_trace_file(kobj, attr) do { } while (0)
+#endif
+
+#endif
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
new file mode 100644
index 0000000..9df8a1a
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -0,0 +1,2381 @@
+/* ------------------------------------------------------------
+ * ibmvscsi.c
+ * (C) Copyright IBM Corporation 1994, 2004
+ * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
+ * Santiago Leon (santil@us.ibm.com)
+ * Dave Boutcher (sleddog@us.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ *
+ * ------------------------------------------------------------
+ * Emulation of a SCSI host adapter for Virtual I/O devices
+ *
+ * This driver supports the SCSI adapter implemented by the IBM
+ * Power5 firmware. That SCSI adapter is not a physical adapter,
+ * but allows Linux SCSI peripheral drivers to directly
+ * access devices in another logical partition on the physical system.
+ *
+ * The virtual adapter(s) are present in the open firmware device
+ * tree just like real adapters.
+ *
+ * One of the capabilities provided on these systems is the ability
+ * to DMA between partitions. The architecture states that for VSCSI,
+ * the server side is allowed to DMA to and from the client. The client
+ * is never trusted to DMA to or from the server directly.
+ *
+ * Messages are sent between partitions on a "Command/Response Queue"
+ * (CRQ), which is just a buffer of 16 byte entries in the receiver's
+ * Senders cannot access the buffer directly, but send messages by
+ * making a hypervisor call and passing in the 16 bytes. The hypervisor
+ * puts the message in the next 16 byte space in round-robin fashion,
+ * turns on the high order bit of the message (the valid bit), and
+ * generates an interrupt to the receiver (if interrupts are turned on.)
+ * The receiver just turns off the valid bit when they have copied out
+ * the message.
+ *
+ * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
+ * (IU) (as defined in the T10 standard available at www.t10.org), gets
+ * a DMA address for the message, and sends it to the server as the
+ * payload of a CRQ message. The server DMAs the SRP IU and processes it,
+ * including doing any additional data transfers. When it is done, it
+ * DMAs the SRP response back to the same address as the request came from,
+ * and sends a CRQ message back to inform the client that the request has
+ * completed.
+ *
+ * TODO: This is currently pretty tied to the IBM pSeries hypervisor
+ * interfaces. It would be really nice to abstract this above an RDMA
+ * layer.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/kthread.h>
+#include <asm/firmware.h>
+#include <asm/vio.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_transport_srp.h>
+#include "ibmvscsi.h"
+
+/* The values below are somewhat arbitrary default values, but
+ * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
+ * Note that there are 3 bits of channel value, 6 bits of id, and
+ * 5 bits of LUN.
+ */
+static int max_id = 64;
+static int max_channel = 3;
+static int init_timeout = 300;
+static int login_timeout = 60;
+static int info_timeout = 30;
+static int abort_timeout = 60;
+static int reset_timeout = 60;
+static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
+static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
+static int fast_fail = 1;
+static int client_reserve = 1;
+static char partition_name[96] = "UNKNOWN";
+static unsigned int partition_number = -1;
+static LIST_HEAD(ibmvscsi_head);
+
+static struct scsi_transport_template *ibmvscsi_transport_template;
+
+#define IBMVSCSI_VERSION "1.5.9"
+
+MODULE_DESCRIPTION("IBM Virtual SCSI");
+MODULE_AUTHOR("Dave Boutcher");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(IBMVSCSI_VERSION);
+
+module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]");
+module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]");
+module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
+module_param_named(max_requests, max_requests, int, S_IRUGO);
+MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
+module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
+module_param_named(client_reserve, client_reserve, int, S_IRUGO );
+MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
+
+static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
+ struct ibmvscsi_host_data *hostdata);
+
+/* ------------------------------------------------------------
+ * Routines for managing the command/response queue
+ */
+/**
+ * ibmvscsi_handle_event: - Interrupt handler for crq events
+ * @irq: number of irq to handle, not used
+ * @dev_instance: ibmvscsi_host_data of host that received interrupt
+ *
+ * Disables interrupts and schedules srp_task
+ * Always returns IRQ_HANDLED
+ */
+static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance)
+{
+ struct ibmvscsi_host_data *hostdata =
+ (struct ibmvscsi_host_data *)dev_instance;
+ vio_disable_interrupts(to_vio_dev(hostdata->dev));
+ tasklet_schedule(&hostdata->srp_task);
+ return IRQ_HANDLED;
+}
+
+/**
+ * release_crq_queue: - Deallocates data and unregisters CRQ
+ * @queue: crq_queue to initialize and register
+ * @host_data: ibmvscsi_host_data of host
+ *
+ * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
+ * the crq with the hypervisor.
+ */
+static void ibmvscsi_release_crq_queue(struct crq_queue *queue,
+ struct ibmvscsi_host_data *hostdata,
+ int max_requests)
+{
+ long rc = 0;
+ struct vio_dev *vdev = to_vio_dev(hostdata->dev);
+ free_irq(vdev->irq, (void *)hostdata);
+ tasklet_kill(&hostdata->srp_task);
+ do {
+ if (rc)
+ msleep(100);
+ rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
+ } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
+ dma_unmap_single(hostdata->dev,
+ queue->msg_token,
+ queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
+ free_page((unsigned long)queue->msgs);
+}
+
+/**
+ * crq_queue_next_crq: - Returns the next entry in message queue
+ * @queue: crq_queue to use
+ *
+ * Returns pointer to next entry in queue, or NULL if there are no new
+ * entried in the CRQ.
+ */
+static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
+{
+ struct viosrp_crq *crq;
+ unsigned long flags;
+
+ spin_lock_irqsave(&queue->lock, flags);
+ crq = &queue->msgs[queue->cur];
+ if (crq->valid != VIOSRP_CRQ_FREE) {
+ if (++queue->cur == queue->size)
+ queue->cur = 0;
+
+ /* Ensure the read of the valid bit occurs before reading any
+ * other bits of the CRQ entry
+ */
+ rmb();
+ } else
+ crq = NULL;
+ spin_unlock_irqrestore(&queue->lock, flags);
+
+ return crq;
+}
+
+/**
+ * ibmvscsi_send_crq: - Send a CRQ
+ * @hostdata: the adapter
+ * @word1: the first 64 bits of the data
+ * @word2: the second 64 bits of the data
+ */
+static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
+ u64 word1, u64 word2)
+{
+ struct vio_dev *vdev = to_vio_dev(hostdata->dev);
+
+ /*
+ * Ensure the command buffer is flushed to memory before handing it
+ * over to the VIOS to prevent it from fetching any stale data.
+ */
+ mb();
+ return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
+}
+
+/**
+ * ibmvscsi_task: - Process srps asynchronously
+ * @data: ibmvscsi_host_data of host
+ */
+static void ibmvscsi_task(void *data)
+{
+ struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
+ struct vio_dev *vdev = to_vio_dev(hostdata->dev);
+ struct viosrp_crq *crq;
+ int done = 0;
+
+ while (!done) {
+ /* Pull all the valid messages off the CRQ */
+ while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
+ ibmvscsi_handle_crq(crq, hostdata);
+ crq->valid = VIOSRP_CRQ_FREE;
+ wmb();
+ }
+
+ vio_enable_interrupts(vdev);
+ crq = crq_queue_next_crq(&hostdata->queue);
+ if (crq != NULL) {
+ vio_disable_interrupts(vdev);
+ ibmvscsi_handle_crq(crq, hostdata);
+ crq->valid = VIOSRP_CRQ_FREE;
+ wmb();
+ } else {
+ done = 1;
+ }
+ }
+}
+
+static void gather_partition_info(void)
+{
+ const char *ppartition_name;
+ const __be32 *p_number_ptr;
+
+ /* Retrieve information about this partition */
+ if (!of_root)
+ return;
+
+ of_node_get(of_root);
+
+ ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL);
+ if (ppartition_name)
+ strlcpy(partition_name, ppartition_name,
+ sizeof(partition_name));
+ p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL);
+ if (p_number_ptr)
+ partition_number = of_read_number(p_number_ptr, 1);
+ of_node_put(of_root);
+}
+
+static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
+{
+ memset(&hostdata->madapter_info, 0x00,
+ sizeof(hostdata->madapter_info));
+
+ dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
+ strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
+
+ strncpy(hostdata->madapter_info.partition_name, partition_name,
+ sizeof(hostdata->madapter_info.partition_name));
+
+ hostdata->madapter_info.partition_number =
+ cpu_to_be32(partition_number);
+
+ hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1);
+ hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX);
+}
+
+/**
+ * reset_crq_queue: - resets a crq after a failure
+ * @queue: crq_queue to initialize and register
+ * @hostdata: ibmvscsi_host_data of host
+ *
+ */
+static int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
+ struct ibmvscsi_host_data *hostdata)
+{
+ int rc = 0;
+ struct vio_dev *vdev = to_vio_dev(hostdata->dev);
+
+ /* Close the CRQ */
+ do {
+ if (rc)
+ msleep(100);
+ rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
+ } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
+
+ /* Clean out the queue */
+ memset(queue->msgs, 0x00, PAGE_SIZE);
+ queue->cur = 0;
+
+ set_adapter_info(hostdata);
+
+ /* And re-open it again */
+ rc = plpar_hcall_norets(H_REG_CRQ,
+ vdev->unit_address,
+ queue->msg_token, PAGE_SIZE);
+ if (rc == H_CLOSED) {
+ /* Adapter is good, but other end is not ready */
+ dev_warn(hostdata->dev, "Partner adapter not ready\n");
+ } else if (rc != 0) {
+ dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
+ }
+ return rc;
+}
+
+/**
+ * initialize_crq_queue: - Initializes and registers CRQ with hypervisor
+ * @queue: crq_queue to initialize and register
+ * @hostdata: ibmvscsi_host_data of host
+ *
+ * Allocates a page for messages, maps it for dma, and registers
+ * the crq with the hypervisor.
+ * Returns zero on success.
+ */
+static int ibmvscsi_init_crq_queue(struct crq_queue *queue,
+ struct ibmvscsi_host_data *hostdata,
+ int max_requests)
+{
+ int rc;
+ int retrc;
+ struct vio_dev *vdev = to_vio_dev(hostdata->dev);
+
+ queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
+
+ if (!queue->msgs)
+ goto malloc_failed;
+ queue->size = PAGE_SIZE / sizeof(*queue->msgs);
+
+ queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
+ queue->size * sizeof(*queue->msgs),
+ DMA_BIDIRECTIONAL);
+
+ if (dma_mapping_error(hostdata->dev, queue->msg_token))
+ goto map_failed;
+
+ gather_partition_info();
+ set_adapter_info(hostdata);
+
+ retrc = rc = plpar_hcall_norets(H_REG_CRQ,
+ vdev->unit_address,
+ queue->msg_token, PAGE_SIZE);
+ if (rc == H_RESOURCE)
+ /* maybe kexecing and resource is busy. try a reset */
+ rc = ibmvscsi_reset_crq_queue(queue,
+ hostdata);
+
+ if (rc == H_CLOSED) {
+ /* Adapter is good, but other end is not ready */
+ dev_warn(hostdata->dev, "Partner adapter not ready\n");
+ retrc = 0;
+ } else if (rc != 0) {
+ dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
+ goto reg_crq_failed;
+ }
+
+ queue->cur = 0;
+ spin_lock_init(&queue->lock);
+
+ tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
+ (unsigned long)hostdata);
+
+ if (request_irq(vdev->irq,
+ ibmvscsi_handle_event,
+ 0, "ibmvscsi", (void *)hostdata) != 0) {
+ dev_err(hostdata->dev, "couldn't register irq 0x%x\n",
+ vdev->irq);
+ goto req_irq_failed;
+ }
+
+ rc = vio_enable_interrupts(vdev);
+ if (rc != 0) {
+ dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
+ goto req_irq_failed;
+ }
+
+ return retrc;
+
+ req_irq_failed:
+ tasklet_kill(&hostdata->srp_task);
+ rc = 0;
+ do {
+ if (rc)
+ msleep(100);
+ rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
+ } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
+ reg_crq_failed:
+ dma_unmap_single(hostdata->dev,
+ queue->msg_token,
+ queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
+ map_failed:
+ free_page((unsigned long)queue->msgs);
+ malloc_failed:
+ return -1;
+}
+
+/**
+ * reenable_crq_queue: - reenables a crq after
+ * @queue: crq_queue to initialize and register
+ * @hostdata: ibmvscsi_host_data of host
+ *
+ */
+static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
+ struct ibmvscsi_host_data *hostdata)
+{
+ int rc = 0;
+ struct vio_dev *vdev = to_vio_dev(hostdata->dev);
+
+ /* Re-enable the CRQ */
+ do {
+ if (rc)
+ msleep(100);
+ rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
+ } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
+
+ if (rc)
+ dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
+ return rc;
+}
+
+/* ------------------------------------------------------------
+ * Routines for the event pool and event structs
+ */
+/**
+ * initialize_event_pool: - Allocates and initializes the event pool for a host
+ * @pool: event_pool to be initialized
+ * @size: Number of events in pool
+ * @hostdata: ibmvscsi_host_data who owns the event pool
+ *
+ * Returns zero on success.
+*/
+static int initialize_event_pool(struct event_pool *pool,
+ int size, struct ibmvscsi_host_data *hostdata)
+{
+ int i;
+
+ pool->size = size;
+ pool->next = 0;
+ pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
+ if (!pool->events)
+ return -ENOMEM;
+
+ pool->iu_storage =
+ dma_alloc_coherent(hostdata->dev,
+ pool->size * sizeof(*pool->iu_storage),
+ &pool->iu_token, 0);
+ if (!pool->iu_storage) {
+ kfree(pool->events);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < pool->size; ++i) {
+ struct srp_event_struct *evt = &pool->events[i];
+ memset(&evt->crq, 0x00, sizeof(evt->crq));
+ atomic_set(&evt->free, 1);
+ evt->crq.valid = VIOSRP_CRQ_CMD_RSP;
+ evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu));
+ evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token +
+ sizeof(*evt->xfer_iu) * i);
+ evt->xfer_iu = pool->iu_storage + i;
+ evt->hostdata = hostdata;
+ evt->ext_list = NULL;
+ evt->ext_list_token = 0;
+ }
+
+ return 0;
+}
+
+/**
+ * release_event_pool: - Frees memory of an event pool of a host
+ * @pool: event_pool to be released
+ * @hostdata: ibmvscsi_host_data who owns the even pool
+ *
+ * Returns zero on success.
+*/
+static void release_event_pool(struct event_pool *pool,
+ struct ibmvscsi_host_data *hostdata)
+{
+ int i, in_use = 0;
+ for (i = 0; i < pool->size; ++i) {
+ if (atomic_read(&pool->events[i].free) != 1)
+ ++in_use;
+ if (pool->events[i].ext_list) {
+ dma_free_coherent(hostdata->dev,
+ SG_ALL * sizeof(struct srp_direct_buf),
+ pool->events[i].ext_list,
+ pool->events[i].ext_list_token);
+ }
+ }
+ if (in_use)
+ dev_warn(hostdata->dev, "releasing event pool with %d "
+ "events still in use?\n", in_use);
+ kfree(pool->events);
+ dma_free_coherent(hostdata->dev,
+ pool->size * sizeof(*pool->iu_storage),
+ pool->iu_storage, pool->iu_token);
+}
+
+/**
+ * valid_event_struct: - Determines if event is valid.
+ * @pool: event_pool that contains the event
+ * @evt: srp_event_struct to be checked for validity
+ *
+ * Returns zero if event is invalid, one otherwise.
+*/
+static int valid_event_struct(struct event_pool *pool,
+ struct srp_event_struct *evt)
+{
+ int index = evt - pool->events;
+ if (index < 0 || index >= pool->size) /* outside of bounds */
+ return 0;
+ if (evt != pool->events + index) /* unaligned */
+ return 0;
+ return 1;
+}
+
+/**
+ * ibmvscsi_free-event_struct: - Changes status of event to "free"
+ * @pool: event_pool that contains the event
+ * @evt: srp_event_struct to be modified
+ *
+*/
+static void free_event_struct(struct event_pool *pool,
+ struct srp_event_struct *evt)
+{
+ if (!valid_event_struct(pool, evt)) {
+ dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
+ "(not in pool %p)\n", evt, pool->events);
+ return;
+ }
+ if (atomic_inc_return(&evt->free) != 1) {
+ dev_err(evt->hostdata->dev, "Freeing event_struct %p "
+ "which is not in use!\n", evt);
+ return;
+ }
+}
+
+/**
+ * get_evt_struct: - Gets the next free event in pool
+ * @pool: event_pool that contains the events to be searched
+ *
+ * Returns the next event in "free" state, and NULL if none are free.
+ * Note that no synchronization is done here, we assume the host_lock
+ * will syncrhonze things.
+*/
+static struct srp_event_struct *get_event_struct(struct event_pool *pool)
+{
+ int i;
+ int poolsize = pool->size;
+ int offset = pool->next;
+
+ for (i = 0; i < poolsize; i++) {
+ offset = (offset + 1) % poolsize;
+ if (!atomic_dec_if_positive(&pool->events[offset].free)) {
+ pool->next = offset;
+ return &pool->events[offset];
+ }
+ }
+
+ printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
+ return NULL;
+}
+
+/**
+ * init_event_struct: Initialize fields in an event struct that are always
+ * required.
+ * @evt: The event
+ * @done: Routine to call when the event is responded to
+ * @format: SRP or MAD format
+ * @timeout: timeout value set in the CRQ
+ */
+static void init_event_struct(struct srp_event_struct *evt_struct,
+ void (*done) (struct srp_event_struct *),
+ u8 format,
+ int timeout)
+{
+ evt_struct->cmnd = NULL;
+ evt_struct->cmnd_done = NULL;
+ evt_struct->sync_srp = NULL;
+ evt_struct->crq.format = format;
+ evt_struct->crq.timeout = cpu_to_be16(timeout);
+ evt_struct->done = done;
+}
+
+/* ------------------------------------------------------------
+ * Routines for receiving SCSI responses from the hosting partition
+ */
+
+/**
+ * set_srp_direction: Set the fields in the srp related to data
+ * direction and number of buffers based on the direction in
+ * the scsi_cmnd and the number of buffers
+ */
+static void set_srp_direction(struct scsi_cmnd *cmd,
+ struct srp_cmd *srp_cmd,
+ int numbuf)
+{
+ u8 fmt;
+
+ if (numbuf == 0)
+ return;
+
+ if (numbuf == 1)
+ fmt = SRP_DATA_DESC_DIRECT;
+ else {
+ fmt = SRP_DATA_DESC_INDIRECT;
+ numbuf = min(numbuf, MAX_INDIRECT_BUFS);
+
+ if (cmd->sc_data_direction == DMA_TO_DEVICE)
+ srp_cmd->data_out_desc_cnt = numbuf;
+ else
+ srp_cmd->data_in_desc_cnt = numbuf;
+ }
+
+ if (cmd->sc_data_direction == DMA_TO_DEVICE)
+ srp_cmd->buf_fmt = fmt << 4;
+ else
+ srp_cmd->buf_fmt = fmt;
+}
+
+/**
+ * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
+ * @cmd: srp_cmd whose additional_data member will be unmapped
+ * @dev: device for which the memory is mapped
+ *
+*/
+static void unmap_cmd_data(struct srp_cmd *cmd,
+ struct srp_event_struct *evt_struct,
+ struct device *dev)
+{
+ u8 out_fmt, in_fmt;
+
+ out_fmt = cmd->buf_fmt >> 4;
+ in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
+
+ if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
+ return;
+
+ if (evt_struct->cmnd)
+ scsi_dma_unmap(evt_struct->cmnd);
+}
+
+static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
+ struct srp_direct_buf *md)
+{
+ int i;
+ struct scatterlist *sg;
+ u64 total_length = 0;
+
+ scsi_for_each_sg(cmd, sg, nseg, i) {
+ struct srp_direct_buf *descr = md + i;
+ descr->va = cpu_to_be64(sg_dma_address(sg));
+ descr->len = cpu_to_be32(sg_dma_len(sg));
+ descr->key = 0;
+ total_length += sg_dma_len(sg);
+ }
+ return total_length;
+}
+
+/**
+ * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
+ * @cmd: struct scsi_cmnd with the scatterlist
+ * @srp_cmd: srp_cmd that contains the memory descriptor
+ * @dev: device for which to map dma memory
+ *
+ * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
+ * Returns 1 on success.
+*/
+static int map_sg_data(struct scsi_cmnd *cmd,
+ struct srp_event_struct *evt_struct,
+ struct srp_cmd *srp_cmd, struct device *dev)
+{
+
+ int sg_mapped;
+ u64 total_length = 0;
+ struct srp_direct_buf *data =
+ (struct srp_direct_buf *) srp_cmd->add_data;
+ struct srp_indirect_buf *indirect =
+ (struct srp_indirect_buf *) data;
+
+ sg_mapped = scsi_dma_map(cmd);
+ if (!sg_mapped)
+ return 1;
+ else if (sg_mapped < 0)
+ return 0;
+
+ set_srp_direction(cmd, srp_cmd, sg_mapped);
+
+ /* special case; we can use a single direct descriptor */
+ if (sg_mapped == 1) {
+ map_sg_list(cmd, sg_mapped, data);
+ return 1;
+ }
+
+ indirect->table_desc.va = 0;
+ indirect->table_desc.len = cpu_to_be32(sg_mapped *
+ sizeof(struct srp_direct_buf));
+ indirect->table_desc.key = 0;
+
+ if (sg_mapped <= MAX_INDIRECT_BUFS) {
+ total_length = map_sg_list(cmd, sg_mapped,
+ &indirect->desc_list[0]);
+ indirect->len = cpu_to_be32(total_length);
+ return 1;
+ }
+
+ /* get indirect table */
+ if (!evt_struct->ext_list) {
+ evt_struct->ext_list = (struct srp_direct_buf *)
+ dma_alloc_coherent(dev,
+ SG_ALL * sizeof(struct srp_direct_buf),
+ &evt_struct->ext_list_token, 0);
+ if (!evt_struct->ext_list) {
+ if (!firmware_has_feature(FW_FEATURE_CMO))
+ sdev_printk(KERN_ERR, cmd->device,
+ "Can't allocate memory "
+ "for indirect table\n");
+ scsi_dma_unmap(cmd);
+ return 0;
+ }
+ }
+
+ total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
+
+ indirect->len = cpu_to_be32(total_length);
+ indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token);
+ indirect->table_desc.len = cpu_to_be32(sg_mapped *
+ sizeof(indirect->desc_list[0]));
+ memcpy(indirect->desc_list, evt_struct->ext_list,
+ MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
+ return 1;
+}
+
+/**
+ * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
+ * @cmd: struct scsi_cmnd with the memory to be mapped
+ * @srp_cmd: srp_cmd that contains the memory descriptor
+ * @dev: dma device for which to map dma memory
+ *
+ * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
+ * Returns 1 on success.
+*/
+static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
+ struct srp_event_struct *evt_struct,
+ struct srp_cmd *srp_cmd, struct device *dev)
+{
+ switch (cmd->sc_data_direction) {
+ case DMA_FROM_DEVICE:
+ case DMA_TO_DEVICE:
+ break;
+ case DMA_NONE:
+ return 1;
+ case DMA_BIDIRECTIONAL:
+ sdev_printk(KERN_ERR, cmd->device,
+ "Can't map DMA_BIDIRECTIONAL to read/write\n");
+ return 0;
+ default:
+ sdev_printk(KERN_ERR, cmd->device,
+ "Unknown data direction 0x%02x; can't map!\n",
+ cmd->sc_data_direction);
+ return 0;
+ }
+
+ return map_sg_data(cmd, evt_struct, srp_cmd, dev);
+}
+
+/**
+ * purge_requests: Our virtual adapter just shut down. purge any sent requests
+ * @hostdata: the adapter
+ */
+static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
+{
+ struct srp_event_struct *evt;
+ unsigned long flags;
+
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ while (!list_empty(&hostdata->sent)) {
+ evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
+ list_del(&evt->list);
+ del_timer(&evt->timer);
+
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ if (evt->cmnd) {
+ evt->cmnd->result = (error_code << 16);
+ unmap_cmd_data(&evt->iu.srp.cmd, evt,
+ evt->hostdata->dev);
+ if (evt->cmnd_done)
+ evt->cmnd_done(evt->cmnd);
+ } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT &&
+ evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
+ evt->done(evt);
+ free_event_struct(&evt->hostdata->pool, evt);
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ }
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+}
+
+/**
+ * ibmvscsi_reset_host - Reset the connection to the server
+ * @hostdata: struct ibmvscsi_host_data to reset
+*/
+static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
+{
+ scsi_block_requests(hostdata->host);
+ atomic_set(&hostdata->request_limit, 0);
+
+ purge_requests(hostdata, DID_ERROR);
+ hostdata->reset_crq = 1;
+ wake_up(&hostdata->work_wait_q);
+}
+
+/**
+ * ibmvscsi_timeout - Internal command timeout handler
+ * @evt_struct: struct srp_event_struct that timed out
+ *
+ * Called when an internally generated command times out
+*/
+static void ibmvscsi_timeout(struct timer_list *t)
+{
+ struct srp_event_struct *evt_struct = from_timer(evt_struct, t, timer);
+ struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
+
+ dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
+ evt_struct->iu.srp.cmd.opcode);
+
+ ibmvscsi_reset_host(hostdata);
+}
+
+
+/* ------------------------------------------------------------
+ * Routines for sending and receiving SRPs
+ */
+/**
+ * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
+ * @evt_struct: evt_struct to be sent
+ * @hostdata: ibmvscsi_host_data of host
+ * @timeout: timeout in seconds - 0 means do not time command
+ *
+ * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
+ * Note that this routine assumes that host_lock is held for synchronization
+*/
+static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
+ struct ibmvscsi_host_data *hostdata,
+ unsigned long timeout)
+{
+ __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq;
+ int request_status = 0;
+ int rc;
+ int srp_req = 0;
+
+ /* If we have exhausted our request limit, just fail this request,
+ * unless it is for a reset or abort.
+ * Note that there are rare cases involving driver generated requests
+ * (such as task management requests) that the mid layer may think we
+ * can handle more requests (can_queue) when we actually can't
+ */
+ if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
+ srp_req = 1;
+ request_status =
+ atomic_dec_if_positive(&hostdata->request_limit);
+ /* If request limit was -1 when we started, it is now even
+ * less than that
+ */
+ if (request_status < -1)
+ goto send_error;
+ /* Otherwise, we may have run out of requests. */
+ /* If request limit was 0 when we started the adapter is in the
+ * process of performing a login with the server adapter, or
+ * we may have run out of requests.
+ */
+ else if (request_status == -1 &&
+ evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
+ goto send_busy;
+ /* Abort and reset calls should make it through.
+ * Nothing except abort and reset should use the last two
+ * slots unless we had two or less to begin with.
+ */
+ else if (request_status < 2 &&
+ evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
+ /* In the case that we have less than two requests
+ * available, check the server limit as a combination
+ * of the request limit and the number of requests
+ * in-flight (the size of the send list). If the
+ * server limit is greater than 2, return busy so
+ * that the last two are reserved for reset and abort.
+ */
+ int server_limit = request_status;
+ struct srp_event_struct *tmp_evt;
+
+ list_for_each_entry(tmp_evt, &hostdata->sent, list) {
+ server_limit++;
+ }
+
+ if (server_limit > 2)
+ goto send_busy;
+ }
+ }
+
+ /* Copy the IU into the transfer area */
+ *evt_struct->xfer_iu = evt_struct->iu;
+ evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
+
+ /* Add this to the sent list. We need to do this
+ * before we actually send
+ * in case it comes back REALLY fast
+ */
+ list_add_tail(&evt_struct->list, &hostdata->sent);
+
+ timer_setup(&evt_struct->timer, ibmvscsi_timeout, 0);
+ if (timeout) {
+ evt_struct->timer.expires = jiffies + (timeout * HZ);
+ add_timer(&evt_struct->timer);
+ }
+
+ rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]),
+ be64_to_cpu(crq_as_u64[1]));
+ if (rc != 0) {
+ list_del(&evt_struct->list);
+ del_timer(&evt_struct->timer);
+
+ /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
+ * Firmware will send a CRQ with a transport event (0xFF) to
+ * tell this client what has happened to the transport. This
+ * will be handled in ibmvscsi_handle_crq()
+ */
+ if (rc == H_CLOSED) {
+ dev_warn(hostdata->dev, "send warning. "
+ "Receive queue closed, will retry.\n");
+ goto send_busy;
+ }
+ dev_err(hostdata->dev, "send error %d\n", rc);
+ if (srp_req)
+ atomic_inc(&hostdata->request_limit);
+ goto send_error;
+ }
+
+ return 0;
+
+ send_busy:
+ unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
+
+ free_event_struct(&hostdata->pool, evt_struct);
+ if (srp_req && request_status != -1)
+ atomic_inc(&hostdata->request_limit);
+ return SCSI_MLQUEUE_HOST_BUSY;
+
+ send_error:
+ unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
+
+ if (evt_struct->cmnd != NULL) {
+ evt_struct->cmnd->result = DID_ERROR << 16;
+ evt_struct->cmnd_done(evt_struct->cmnd);
+ } else if (evt_struct->done)
+ evt_struct->done(evt_struct);
+
+ free_event_struct(&hostdata->pool, evt_struct);
+ return 0;
+}
+
+/**
+ * handle_cmd_rsp: - Handle responses from commands
+ * @evt_struct: srp_event_struct to be handled
+ *
+ * Used as a callback by when sending scsi cmds.
+ * Gets called by ibmvscsi_handle_crq()
+*/
+static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
+{
+ struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
+ struct scsi_cmnd *cmnd = evt_struct->cmnd;
+
+ if (unlikely(rsp->opcode != SRP_RSP)) {
+ if (printk_ratelimit())
+ dev_warn(evt_struct->hostdata->dev,
+ "bad SRP RSP type %#02x\n", rsp->opcode);
+ }
+
+ if (cmnd) {
+ cmnd->result |= rsp->status;
+ if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
+ memcpy(cmnd->sense_buffer,
+ rsp->data,
+ be32_to_cpu(rsp->sense_data_len));
+ unmap_cmd_data(&evt_struct->iu.srp.cmd,
+ evt_struct,
+ evt_struct->hostdata->dev);
+
+ if (rsp->flags & SRP_RSP_FLAG_DOOVER)
+ scsi_set_resid(cmnd,
+ be32_to_cpu(rsp->data_out_res_cnt));
+ else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
+ scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt));
+ }
+
+ if (evt_struct->cmnd_done)
+ evt_struct->cmnd_done(cmnd);
+}
+
+/**
+ * lun_from_dev: - Returns the lun of the scsi device
+ * @dev: struct scsi_device
+ *
+*/
+static inline u16 lun_from_dev(struct scsi_device *dev)
+{
+ return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
+}
+
+/**
+ * ibmvscsi_queue: - The queuecommand function of the scsi template
+ * @cmd: struct scsi_cmnd to be executed
+ * @done: Callback function to be called when cmd is completed
+*/
+static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
+ void (*done) (struct scsi_cmnd *))
+{
+ struct srp_cmd *srp_cmd;
+ struct srp_event_struct *evt_struct;
+ struct srp_indirect_buf *indirect;
+ struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
+ u16 lun = lun_from_dev(cmnd->device);
+ u8 out_fmt, in_fmt;
+
+ cmnd->result = (DID_OK << 16);
+ evt_struct = get_event_struct(&hostdata->pool);
+ if (!evt_struct)
+ return SCSI_MLQUEUE_HOST_BUSY;
+
+ /* Set up the actual SRP IU */
+ srp_cmd = &evt_struct->iu.srp.cmd;
+ memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
+ srp_cmd->opcode = SRP_CMD;
+ memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
+ int_to_scsilun(lun, &srp_cmd->lun);
+
+ if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
+ if (!firmware_has_feature(FW_FEATURE_CMO))
+ sdev_printk(KERN_ERR, cmnd->device,
+ "couldn't convert cmd to srp_cmd\n");
+ free_event_struct(&hostdata->pool, evt_struct);
+ return SCSI_MLQUEUE_HOST_BUSY;
+ }
+
+ init_event_struct(evt_struct,
+ handle_cmd_rsp,
+ VIOSRP_SRP_FORMAT,
+ cmnd->request->timeout/HZ);
+
+ evt_struct->cmnd = cmnd;
+ evt_struct->cmnd_done = done;
+
+ /* Fix up dma address of the buffer itself */
+ indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
+ out_fmt = srp_cmd->buf_fmt >> 4;
+ in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
+ if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
+ out_fmt == SRP_DATA_DESC_INDIRECT) &&
+ indirect->table_desc.va == 0) {
+ indirect->table_desc.va =
+ cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) +
+ offsetof(struct srp_cmd, add_data) +
+ offsetof(struct srp_indirect_buf, desc_list));
+ }
+
+ return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
+}
+
+static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
+
+/* ------------------------------------------------------------
+ * Routines for driver initialization
+ */
+
+/**
+ * map_persist_bufs: - Pre-map persistent data for adapter logins
+ * @hostdata: ibmvscsi_host_data of host
+ *
+ * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
+ * Return 1 on error, 0 on success.
+ */
+static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
+{
+
+ hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
+ sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
+
+ if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
+ dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
+ return 1;
+ }
+
+ hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
+ &hostdata->madapter_info,
+ sizeof(hostdata->madapter_info),
+ DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
+ dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
+ dma_unmap_single(hostdata->dev, hostdata->caps_addr,
+ sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
+ return 1;
+ }
+
+ return 0;
+}
+
+/**
+ * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
+ * @hostdata: ibmvscsi_host_data of host
+ *
+ * Unmap the capabilities and adapter info DMA buffers
+ */
+static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
+{
+ dma_unmap_single(hostdata->dev, hostdata->caps_addr,
+ sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
+
+ dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
+ sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
+}
+
+/**
+ * login_rsp: - Handle response to SRP login request
+ * @evt_struct: srp_event_struct with the response
+ *
+ * Used as a "done" callback by when sending srp_login. Gets called
+ * by ibmvscsi_handle_crq()
+*/
+static void login_rsp(struct srp_event_struct *evt_struct)
+{
+ struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
+ switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
+ case SRP_LOGIN_RSP: /* it worked! */
+ break;
+ case SRP_LOGIN_REJ: /* refused! */
+ dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
+ evt_struct->xfer_iu->srp.login_rej.reason);
+ /* Login failed. */
+ atomic_set(&hostdata->request_limit, -1);
+ return;
+ default:
+ dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
+ evt_struct->xfer_iu->srp.login_rsp.opcode);
+ /* Login failed. */
+ atomic_set(&hostdata->request_limit, -1);
+ return;
+ }
+
+ dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
+ hostdata->client_migrated = 0;
+
+ /* Now we know what the real request-limit is.
+ * This value is set rather than added to request_limit because
+ * request_limit could have been set to -1 by this client.
+ */
+ atomic_set(&hostdata->request_limit,
+ be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta));
+
+ /* If we had any pending I/Os, kick them */
+ scsi_unblock_requests(hostdata->host);
+}
+
+/**
+ * send_srp_login: - Sends the srp login
+ * @hostdata: ibmvscsi_host_data of host
+ *
+ * Returns zero if successful.
+*/
+static int send_srp_login(struct ibmvscsi_host_data *hostdata)
+{
+ int rc;
+ unsigned long flags;
+ struct srp_login_req *login;
+ struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
+
+ BUG_ON(!evt_struct);
+ init_event_struct(evt_struct, login_rsp,
+ VIOSRP_SRP_FORMAT, login_timeout);
+
+ login = &evt_struct->iu.srp.login_req;
+ memset(login, 0, sizeof(*login));
+ login->opcode = SRP_LOGIN_REQ;
+ login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
+ login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
+ SRP_BUF_FORMAT_INDIRECT);
+
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ /* Start out with a request limit of 0, since this is negotiated in
+ * the login request we are just sending and login requests always
+ * get sent by the driver regardless of request_limit.
+ */
+ atomic_set(&hostdata->request_limit, 0);
+
+ rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ dev_info(hostdata->dev, "sent SRP login\n");
+ return rc;
+};
+
+/**
+ * capabilities_rsp: - Handle response to MAD adapter capabilities request
+ * @evt_struct: srp_event_struct with the response
+ *
+ * Used as a "done" callback by when sending adapter_info.
+ */
+static void capabilities_rsp(struct srp_event_struct *evt_struct)
+{
+ struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
+
+ if (evt_struct->xfer_iu->mad.capabilities.common.status) {
+ dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
+ evt_struct->xfer_iu->mad.capabilities.common.status);
+ } else {
+ if (hostdata->caps.migration.common.server_support !=
+ cpu_to_be16(SERVER_SUPPORTS_CAP))
+ dev_info(hostdata->dev, "Partition migration not supported\n");
+
+ if (client_reserve) {
+ if (hostdata->caps.reserve.common.server_support ==
+ cpu_to_be16(SERVER_SUPPORTS_CAP))
+ dev_info(hostdata->dev, "Client reserve enabled\n");
+ else
+ dev_info(hostdata->dev, "Client reserve not supported\n");
+ }
+ }
+
+ send_srp_login(hostdata);
+}
+
+/**
+ * send_mad_capabilities: - Sends the mad capabilities request
+ * and stores the result so it can be retrieved with
+ * @hostdata: ibmvscsi_host_data of host
+ */
+static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
+{
+ struct viosrp_capabilities *req;
+ struct srp_event_struct *evt_struct;
+ unsigned long flags;
+ struct device_node *of_node = hostdata->dev->of_node;
+ const char *location;
+
+ evt_struct = get_event_struct(&hostdata->pool);
+ BUG_ON(!evt_struct);
+
+ init_event_struct(evt_struct, capabilities_rsp,
+ VIOSRP_MAD_FORMAT, info_timeout);
+
+ req = &evt_struct->iu.mad.capabilities;
+ memset(req, 0, sizeof(*req));
+
+ hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED);
+ if (hostdata->client_migrated)
+ hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED);
+
+ strlcpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
+ sizeof(hostdata->caps.name));
+
+ location = of_get_property(of_node, "ibm,loc-code", NULL);
+ location = location ? location : dev_name(hostdata->dev);
+ strlcpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
+
+ req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE);
+ req->buffer = cpu_to_be64(hostdata->caps_addr);
+
+ hostdata->caps.migration.common.cap_type =
+ cpu_to_be32(MIGRATION_CAPABILITIES);
+ hostdata->caps.migration.common.length =
+ cpu_to_be16(sizeof(hostdata->caps.migration));
+ hostdata->caps.migration.common.server_support =
+ cpu_to_be16(SERVER_SUPPORTS_CAP);
+ hostdata->caps.migration.ecl = cpu_to_be32(1);
+
+ if (client_reserve) {
+ hostdata->caps.reserve.common.cap_type =
+ cpu_to_be32(RESERVATION_CAPABILITIES);
+ hostdata->caps.reserve.common.length =
+ cpu_to_be16(sizeof(hostdata->caps.reserve));
+ hostdata->caps.reserve.common.server_support =
+ cpu_to_be16(SERVER_SUPPORTS_CAP);
+ hostdata->caps.reserve.type =
+ cpu_to_be32(CLIENT_RESERVE_SCSI_2);
+ req->common.length =
+ cpu_to_be16(sizeof(hostdata->caps));
+ } else
+ req->common.length = cpu_to_be16(sizeof(hostdata->caps) -
+ sizeof(hostdata->caps.reserve));
+
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
+ dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+};
+
+/**
+ * fast_fail_rsp: - Handle response to MAD enable fast fail
+ * @evt_struct: srp_event_struct with the response
+ *
+ * Used as a "done" callback by when sending enable fast fail. Gets called
+ * by ibmvscsi_handle_crq()
+ */
+static void fast_fail_rsp(struct srp_event_struct *evt_struct)
+{
+ struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
+ u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status);
+
+ if (status == VIOSRP_MAD_NOT_SUPPORTED)
+ dev_err(hostdata->dev, "fast_fail not supported in server\n");
+ else if (status == VIOSRP_MAD_FAILED)
+ dev_err(hostdata->dev, "fast_fail request failed\n");
+ else if (status != VIOSRP_MAD_SUCCESS)
+ dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
+
+ send_mad_capabilities(hostdata);
+}
+
+/**
+ * init_host - Start host initialization
+ * @hostdata: ibmvscsi_host_data of host
+ *
+ * Returns zero if successful.
+ */
+static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
+{
+ int rc;
+ unsigned long flags;
+ struct viosrp_fast_fail *fast_fail_mad;
+ struct srp_event_struct *evt_struct;
+
+ if (!fast_fail) {
+ send_mad_capabilities(hostdata);
+ return 0;
+ }
+
+ evt_struct = get_event_struct(&hostdata->pool);
+ BUG_ON(!evt_struct);
+
+ init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
+
+ fast_fail_mad = &evt_struct->iu.mad.fast_fail;
+ memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
+ fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL);
+ fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad));
+
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ return rc;
+}
+
+/**
+ * adapter_info_rsp: - Handle response to MAD adapter info request
+ * @evt_struct: srp_event_struct with the response
+ *
+ * Used as a "done" callback by when sending adapter_info. Gets called
+ * by ibmvscsi_handle_crq()
+*/
+static void adapter_info_rsp(struct srp_event_struct *evt_struct)
+{
+ struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
+
+ if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
+ dev_err(hostdata->dev, "error %d getting adapter info\n",
+ evt_struct->xfer_iu->mad.adapter_info.common.status);
+ } else {
+ dev_info(hostdata->dev, "host srp version: %s, "
+ "host partition %s (%d), OS %d, max io %u\n",
+ hostdata->madapter_info.srp_version,
+ hostdata->madapter_info.partition_name,
+ be32_to_cpu(hostdata->madapter_info.partition_number),
+ be32_to_cpu(hostdata->madapter_info.os_type),
+ be32_to_cpu(hostdata->madapter_info.port_max_txu[0]));
+
+ if (hostdata->madapter_info.port_max_txu[0])
+ hostdata->host->max_sectors =
+ be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9;
+
+ if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX &&
+ strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
+ dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
+ hostdata->madapter_info.srp_version);
+ dev_err(hostdata->dev, "limiting scatterlists to %d\n",
+ MAX_INDIRECT_BUFS);
+ hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
+ }
+
+ if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) {
+ enable_fast_fail(hostdata);
+ return;
+ }
+ }
+
+ send_srp_login(hostdata);
+}
+
+/**
+ * send_mad_adapter_info: - Sends the mad adapter info request
+ * and stores the result so it can be retrieved with
+ * sysfs. We COULD consider causing a failure if the
+ * returned SRP version doesn't match ours.
+ * @hostdata: ibmvscsi_host_data of host
+ *
+ * Returns zero if successful.
+*/
+static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
+{
+ struct viosrp_adapter_info *req;
+ struct srp_event_struct *evt_struct;
+ unsigned long flags;
+
+ evt_struct = get_event_struct(&hostdata->pool);
+ BUG_ON(!evt_struct);
+
+ init_event_struct(evt_struct,
+ adapter_info_rsp,
+ VIOSRP_MAD_FORMAT,
+ info_timeout);
+
+ req = &evt_struct->iu.mad.adapter_info;
+ memset(req, 0x00, sizeof(*req));
+
+ req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE);
+ req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info));
+ req->buffer = cpu_to_be64(hostdata->adapter_info_addr);
+
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
+ dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+};
+
+/**
+ * init_adapter: Start virtual adapter initialization sequence
+ *
+ */
+static void init_adapter(struct ibmvscsi_host_data *hostdata)
+{
+ send_mad_adapter_info(hostdata);
+}
+
+/**
+ * sync_completion: Signal that a synchronous command has completed
+ * Note that after returning from this call, the evt_struct is freed.
+ * the caller waiting on this completion shouldn't touch the evt_struct
+ * again.
+ */
+static void sync_completion(struct srp_event_struct *evt_struct)
+{
+ /* copy the response back */
+ if (evt_struct->sync_srp)
+ *evt_struct->sync_srp = *evt_struct->xfer_iu;
+
+ complete(&evt_struct->comp);
+}
+
+/**
+ * ibmvscsi_abort: Abort a command...from scsi host template
+ * send this over to the server and wait synchronously for the response
+ */
+static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
+{
+ struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
+ struct srp_tsk_mgmt *tsk_mgmt;
+ struct srp_event_struct *evt;
+ struct srp_event_struct *tmp_evt, *found_evt;
+ union viosrp_iu srp_rsp;
+ int rsp_rc;
+ unsigned long flags;
+ u16 lun = lun_from_dev(cmd->device);
+ unsigned long wait_switch = 0;
+
+ /* First, find this command in our sent list so we can figure
+ * out the correct tag
+ */
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ wait_switch = jiffies + (init_timeout * HZ);
+ do {
+ found_evt = NULL;
+ list_for_each_entry(tmp_evt, &hostdata->sent, list) {
+ if (tmp_evt->cmnd == cmd) {
+ found_evt = tmp_evt;
+ break;
+ }
+ }
+
+ if (!found_evt) {
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ return SUCCESS;
+ }
+
+ evt = get_event_struct(&hostdata->pool);
+ if (evt == NULL) {
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ sdev_printk(KERN_ERR, cmd->device,
+ "failed to allocate abort event\n");
+ return FAILED;
+ }
+
+ init_event_struct(evt,
+ sync_completion,
+ VIOSRP_SRP_FORMAT,
+ abort_timeout);
+
+ tsk_mgmt = &evt->iu.srp.tsk_mgmt;
+
+ /* Set up an abort SRP command */
+ memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
+ tsk_mgmt->opcode = SRP_TSK_MGMT;
+ int_to_scsilun(lun, &tsk_mgmt->lun);
+ tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
+ tsk_mgmt->task_tag = (u64) found_evt;
+
+ evt->sync_srp = &srp_rsp;
+
+ init_completion(&evt->comp);
+ rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
+
+ if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
+ break;
+
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ msleep(10);
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ } while (time_before(jiffies, wait_switch));
+
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+
+ if (rsp_rc != 0) {
+ sdev_printk(KERN_ERR, cmd->device,
+ "failed to send abort() event. rc=%d\n", rsp_rc);
+ return FAILED;
+ }
+
+ sdev_printk(KERN_INFO, cmd->device,
+ "aborting command. lun 0x%llx, tag 0x%llx\n",
+ (((u64) lun) << 48), (u64) found_evt);
+
+ wait_for_completion(&evt->comp);
+
+ /* make sure we got a good response */
+ if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
+ if (printk_ratelimit())
+ sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
+ srp_rsp.srp.rsp.opcode);
+ return FAILED;
+ }
+
+ if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
+ rsp_rc = *((int *)srp_rsp.srp.rsp.data);
+ else
+ rsp_rc = srp_rsp.srp.rsp.status;
+
+ if (rsp_rc) {
+ if (printk_ratelimit())
+ sdev_printk(KERN_WARNING, cmd->device,
+ "abort code %d for task tag 0x%llx\n",
+ rsp_rc, tsk_mgmt->task_tag);
+ return FAILED;
+ }
+
+ /* Because we dropped the spinlock above, it's possible
+ * The event is no longer in our list. Make sure it didn't
+ * complete while we were aborting
+ */
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ found_evt = NULL;
+ list_for_each_entry(tmp_evt, &hostdata->sent, list) {
+ if (tmp_evt->cmnd == cmd) {
+ found_evt = tmp_evt;
+ break;
+ }
+ }
+
+ if (found_evt == NULL) {
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
+ tsk_mgmt->task_tag);
+ return SUCCESS;
+ }
+
+ sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
+ tsk_mgmt->task_tag);
+
+ cmd->result = (DID_ABORT << 16);
+ list_del(&found_evt->list);
+ unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
+ found_evt->hostdata->dev);
+ free_event_struct(&found_evt->hostdata->pool, found_evt);
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ atomic_inc(&hostdata->request_limit);
+ return SUCCESS;
+}
+
+/**
+ * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
+ * template send this over to the server and wait synchronously for the
+ * response
+ */
+static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
+{
+ struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
+ struct srp_tsk_mgmt *tsk_mgmt;
+ struct srp_event_struct *evt;
+ struct srp_event_struct *tmp_evt, *pos;
+ union viosrp_iu srp_rsp;
+ int rsp_rc;
+ unsigned long flags;
+ u16 lun = lun_from_dev(cmd->device);
+ unsigned long wait_switch = 0;
+
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ wait_switch = jiffies + (init_timeout * HZ);
+ do {
+ evt = get_event_struct(&hostdata->pool);
+ if (evt == NULL) {
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ sdev_printk(KERN_ERR, cmd->device,
+ "failed to allocate reset event\n");
+ return FAILED;
+ }
+
+ init_event_struct(evt,
+ sync_completion,
+ VIOSRP_SRP_FORMAT,
+ reset_timeout);
+
+ tsk_mgmt = &evt->iu.srp.tsk_mgmt;
+
+ /* Set up a lun reset SRP command */
+ memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
+ tsk_mgmt->opcode = SRP_TSK_MGMT;
+ int_to_scsilun(lun, &tsk_mgmt->lun);
+ tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
+
+ evt->sync_srp = &srp_rsp;
+
+ init_completion(&evt->comp);
+ rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
+
+ if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
+ break;
+
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ msleep(10);
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ } while (time_before(jiffies, wait_switch));
+
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+
+ if (rsp_rc != 0) {
+ sdev_printk(KERN_ERR, cmd->device,
+ "failed to send reset event. rc=%d\n", rsp_rc);
+ return FAILED;
+ }
+
+ sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
+ (((u64) lun) << 48));
+
+ wait_for_completion(&evt->comp);
+
+ /* make sure we got a good response */
+ if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
+ if (printk_ratelimit())
+ sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
+ srp_rsp.srp.rsp.opcode);
+ return FAILED;
+ }
+
+ if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
+ rsp_rc = *((int *)srp_rsp.srp.rsp.data);
+ else
+ rsp_rc = srp_rsp.srp.rsp.status;
+
+ if (rsp_rc) {
+ if (printk_ratelimit())
+ sdev_printk(KERN_WARNING, cmd->device,
+ "reset code %d for task tag 0x%llx\n",
+ rsp_rc, tsk_mgmt->task_tag);
+ return FAILED;
+ }
+
+ /* We need to find all commands for this LUN that have not yet been
+ * responded to, and fail them with DID_RESET
+ */
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
+ if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
+ if (tmp_evt->cmnd)
+ tmp_evt->cmnd->result = (DID_RESET << 16);
+ list_del(&tmp_evt->list);
+ unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
+ tmp_evt->hostdata->dev);
+ free_event_struct(&tmp_evt->hostdata->pool,
+ tmp_evt);
+ atomic_inc(&hostdata->request_limit);
+ if (tmp_evt->cmnd_done)
+ tmp_evt->cmnd_done(tmp_evt->cmnd);
+ else if (tmp_evt->done)
+ tmp_evt->done(tmp_evt);
+ }
+ }
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ return SUCCESS;
+}
+
+/**
+ * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
+ * @cmd: struct scsi_cmnd having problems
+*/
+static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
+{
+ unsigned long wait_switch = 0;
+ struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
+
+ dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
+
+ ibmvscsi_reset_host(hostdata);
+
+ for (wait_switch = jiffies + (init_timeout * HZ);
+ time_before(jiffies, wait_switch) &&
+ atomic_read(&hostdata->request_limit) < 2;) {
+
+ msleep(10);
+ }
+
+ if (atomic_read(&hostdata->request_limit) <= 0)
+ return FAILED;
+
+ return SUCCESS;
+}
+
+/**
+ * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
+ * @crq: Command/Response queue
+ * @hostdata: ibmvscsi_host_data of host
+ *
+*/
+static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
+ struct ibmvscsi_host_data *hostdata)
+{
+ long rc;
+ unsigned long flags;
+ /* The hypervisor copies our tag value here so no byteswapping */
+ struct srp_event_struct *evt_struct =
+ (__force struct srp_event_struct *)crq->IU_data_ptr;
+ switch (crq->valid) {
+ case VIOSRP_CRQ_INIT_RSP: /* initialization */
+ switch (crq->format) {
+ case VIOSRP_CRQ_INIT: /* Initialization message */
+ dev_info(hostdata->dev, "partner initialized\n");
+ /* Send back a response */
+ rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0);
+ if (rc == 0) {
+ /* Now login */
+ init_adapter(hostdata);
+ } else {
+ dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
+ }
+
+ break;
+ case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */
+ dev_info(hostdata->dev, "partner initialization complete\n");
+
+ /* Now login */
+ init_adapter(hostdata);
+ break;
+ default:
+ dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
+ }
+ return;
+ case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */
+ scsi_block_requests(hostdata->host);
+ atomic_set(&hostdata->request_limit, 0);
+ if (crq->format == 0x06) {
+ /* We need to re-setup the interpartition connection */
+ dev_info(hostdata->dev, "Re-enabling adapter!\n");
+ hostdata->client_migrated = 1;
+ hostdata->reenable_crq = 1;
+ purge_requests(hostdata, DID_REQUEUE);
+ wake_up(&hostdata->work_wait_q);
+ } else {
+ dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
+ crq->format);
+ ibmvscsi_reset_host(hostdata);
+ }
+ return;
+ case VIOSRP_CRQ_CMD_RSP: /* real payload */
+ break;
+ default:
+ dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
+ crq->valid);
+ return;
+ }
+
+ /* The only kind of payload CRQs we should get are responses to
+ * things we send. Make sure this response is to something we
+ * actually sent
+ */
+ if (!valid_event_struct(&hostdata->pool, evt_struct)) {
+ dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
+ evt_struct);
+ return;
+ }
+
+ if (atomic_read(&evt_struct->free)) {
+ dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
+ evt_struct);
+ return;
+ }
+
+ if (crq->format == VIOSRP_SRP_FORMAT)
+ atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta),
+ &hostdata->request_limit);
+
+ del_timer(&evt_struct->timer);
+
+ if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
+ evt_struct->cmnd->result = DID_ERROR << 16;
+ if (evt_struct->done)
+ evt_struct->done(evt_struct);
+ else
+ dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
+
+ /*
+ * Lock the host_lock before messing with these structures, since we
+ * are running in a task context
+ */
+ spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
+ list_del(&evt_struct->list);
+ free_event_struct(&evt_struct->hostdata->pool, evt_struct);
+ spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
+}
+
+/**
+ * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
+ * @sdev: struct scsi_device device to configure
+ *
+ * Enable allow_restart for a device if it is a disk. Adjust the
+ * queue_depth here also as is required by the documentation for
+ * struct scsi_host_template.
+ */
+static int ibmvscsi_slave_configure(struct scsi_device *sdev)
+{
+ struct Scsi_Host *shost = sdev->host;
+ unsigned long lock_flags = 0;
+
+ spin_lock_irqsave(shost->host_lock, lock_flags);
+ if (sdev->type == TYPE_DISK) {
+ sdev->allow_restart = 1;
+ blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
+ }
+ spin_unlock_irqrestore(shost->host_lock, lock_flags);
+ return 0;
+}
+
+/**
+ * ibmvscsi_change_queue_depth - Change the device's queue depth
+ * @sdev: scsi device struct
+ * @qdepth: depth to set
+ * @reason: calling context
+ *
+ * Return value:
+ * actual depth set
+ **/
+static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
+{
+ if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
+ qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
+ return scsi_change_queue_depth(sdev, qdepth);
+}
+
+/* ------------------------------------------------------------
+ * sysfs attributes
+ */
+static ssize_t show_host_vhost_loc(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvscsi_host_data *hostdata = shost_priv(shost);
+ int len;
+
+ len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
+ hostdata->caps.loc);
+ return len;
+}
+
+static struct device_attribute ibmvscsi_host_vhost_loc = {
+ .attr = {
+ .name = "vhost_loc",
+ .mode = S_IRUGO,
+ },
+ .show = show_host_vhost_loc,
+};
+
+static ssize_t show_host_vhost_name(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvscsi_host_data *hostdata = shost_priv(shost);
+ int len;
+
+ len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
+ hostdata->caps.name);
+ return len;
+}
+
+static struct device_attribute ibmvscsi_host_vhost_name = {
+ .attr = {
+ .name = "vhost_name",
+ .mode = S_IRUGO,
+ },
+ .show = show_host_vhost_name,
+};
+
+static ssize_t show_host_srp_version(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvscsi_host_data *hostdata = shost_priv(shost);
+ int len;
+
+ len = snprintf(buf, PAGE_SIZE, "%s\n",
+ hostdata->madapter_info.srp_version);
+ return len;
+}
+
+static struct device_attribute ibmvscsi_host_srp_version = {
+ .attr = {
+ .name = "srp_version",
+ .mode = S_IRUGO,
+ },
+ .show = show_host_srp_version,
+};
+
+static ssize_t show_host_partition_name(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvscsi_host_data *hostdata = shost_priv(shost);
+ int len;
+
+ len = snprintf(buf, PAGE_SIZE, "%s\n",
+ hostdata->madapter_info.partition_name);
+ return len;
+}
+
+static struct device_attribute ibmvscsi_host_partition_name = {
+ .attr = {
+ .name = "partition_name",
+ .mode = S_IRUGO,
+ },
+ .show = show_host_partition_name,
+};
+
+static ssize_t show_host_partition_number(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvscsi_host_data *hostdata = shost_priv(shost);
+ int len;
+
+ len = snprintf(buf, PAGE_SIZE, "%d\n",
+ be32_to_cpu(hostdata->madapter_info.partition_number));
+ return len;
+}
+
+static struct device_attribute ibmvscsi_host_partition_number = {
+ .attr = {
+ .name = "partition_number",
+ .mode = S_IRUGO,
+ },
+ .show = show_host_partition_number,
+};
+
+static ssize_t show_host_mad_version(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvscsi_host_data *hostdata = shost_priv(shost);
+ int len;
+
+ len = snprintf(buf, PAGE_SIZE, "%d\n",
+ be32_to_cpu(hostdata->madapter_info.mad_version));
+ return len;
+}
+
+static struct device_attribute ibmvscsi_host_mad_version = {
+ .attr = {
+ .name = "mad_version",
+ .mode = S_IRUGO,
+ },
+ .show = show_host_mad_version,
+};
+
+static ssize_t show_host_os_type(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct ibmvscsi_host_data *hostdata = shost_priv(shost);
+ int len;
+
+ len = snprintf(buf, PAGE_SIZE, "%d\n",
+ be32_to_cpu(hostdata->madapter_info.os_type));
+ return len;
+}
+
+static struct device_attribute ibmvscsi_host_os_type = {
+ .attr = {
+ .name = "os_type",
+ .mode = S_IRUGO,
+ },
+ .show = show_host_os_type,
+};
+
+static ssize_t show_host_config(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return 0;
+}
+
+static struct device_attribute ibmvscsi_host_config = {
+ .attr = {
+ .name = "config",
+ .mode = S_IRUGO,
+ },
+ .show = show_host_config,
+};
+
+static struct device_attribute *ibmvscsi_attrs[] = {
+ &ibmvscsi_host_vhost_loc,
+ &ibmvscsi_host_vhost_name,
+ &ibmvscsi_host_srp_version,
+ &ibmvscsi_host_partition_name,
+ &ibmvscsi_host_partition_number,
+ &ibmvscsi_host_mad_version,
+ &ibmvscsi_host_os_type,
+ &ibmvscsi_host_config,
+ NULL
+};
+
+/* ------------------------------------------------------------
+ * SCSI driver registration
+ */
+static struct scsi_host_template driver_template = {
+ .module = THIS_MODULE,
+ .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
+ .proc_name = "ibmvscsi",
+ .queuecommand = ibmvscsi_queuecommand,
+ .eh_timed_out = srp_timed_out,
+ .eh_abort_handler = ibmvscsi_eh_abort_handler,
+ .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
+ .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
+ .slave_configure = ibmvscsi_slave_configure,
+ .change_queue_depth = ibmvscsi_change_queue_depth,
+ .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
+ .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
+ .this_id = -1,
+ .sg_tablesize = SG_ALL,
+ .use_clustering = ENABLE_CLUSTERING,
+ .shost_attrs = ibmvscsi_attrs,
+};
+
+/**
+ * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
+ *
+ * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
+ *
+ * Return value:
+ * Number of bytes of IO data the driver will need to perform well.
+ */
+static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
+{
+ /* iu_storage data allocated in initialize_event_pool */
+ unsigned long desired_io = max_events * sizeof(union viosrp_iu);
+
+ /* add io space for sg data */
+ desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
+ IBMVSCSI_CMDS_PER_LUN_DEFAULT);
+
+ return desired_io;
+}
+
+static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
+{
+ int rc;
+ char *action = "reset";
+
+ if (hostdata->reset_crq) {
+ smp_rmb();
+ hostdata->reset_crq = 0;
+
+ rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
+ if (!rc)
+ rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
+ vio_enable_interrupts(to_vio_dev(hostdata->dev));
+ } else if (hostdata->reenable_crq) {
+ smp_rmb();
+ action = "enable";
+ rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);
+ hostdata->reenable_crq = 0;
+ if (!rc)
+ rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
+ } else
+ return;
+
+ if (rc) {
+ atomic_set(&hostdata->request_limit, -1);
+ dev_err(hostdata->dev, "error after %s\n", action);
+ }
+
+ scsi_unblock_requests(hostdata->host);
+}
+
+static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
+{
+ if (kthread_should_stop())
+ return 1;
+ else if (hostdata->reset_crq) {
+ smp_rmb();
+ return 1;
+ } else if (hostdata->reenable_crq) {
+ smp_rmb();
+ return 1;
+ }
+
+ return 0;
+}
+
+static int ibmvscsi_work(void *data)
+{
+ struct ibmvscsi_host_data *hostdata = data;
+ int rc;
+
+ set_user_nice(current, MIN_NICE);
+
+ while (1) {
+ rc = wait_event_interruptible(hostdata->work_wait_q,
+ ibmvscsi_work_to_do(hostdata));
+
+ BUG_ON(rc);
+
+ if (kthread_should_stop())
+ break;
+
+ ibmvscsi_do_work(hostdata);
+ }
+
+ return 0;
+}
+
+/**
+ * Called by bus code for each adapter
+ */
+static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
+{
+ struct ibmvscsi_host_data *hostdata;
+ struct Scsi_Host *host;
+ struct device *dev = &vdev->dev;
+ struct srp_rport_identifiers ids;
+ struct srp_rport *rport;
+ unsigned long wait_switch = 0;
+ int rc;
+
+ dev_set_drvdata(&vdev->dev, NULL);
+
+ host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
+ if (!host) {
+ dev_err(&vdev->dev, "couldn't allocate host data\n");
+ goto scsi_host_alloc_failed;
+ }
+
+ host->transportt = ibmvscsi_transport_template;
+ hostdata = shost_priv(host);
+ memset(hostdata, 0x00, sizeof(*hostdata));
+ INIT_LIST_HEAD(&hostdata->sent);
+ init_waitqueue_head(&hostdata->work_wait_q);
+ hostdata->host = host;
+ hostdata->dev = dev;
+ atomic_set(&hostdata->request_limit, -1);
+ hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
+
+ if (map_persist_bufs(hostdata)) {
+ dev_err(&vdev->dev, "couldn't map persistent buffers\n");
+ goto persist_bufs_failed;
+ }
+
+ hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",
+ "ibmvscsi", host->host_no);
+
+ if (IS_ERR(hostdata->work_thread)) {
+ dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",
+ PTR_ERR(hostdata->work_thread));
+ goto init_crq_failed;
+ }
+
+ rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events);
+ if (rc != 0 && rc != H_RESOURCE) {
+ dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
+ goto kill_kthread;
+ }
+ if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {
+ dev_err(&vdev->dev, "couldn't initialize event pool\n");
+ goto init_pool_failed;
+ }
+
+ host->max_lun = IBMVSCSI_MAX_LUN;
+ host->max_id = max_id;
+ host->max_channel = max_channel;
+ host->max_cmd_len = 16;
+
+ dev_info(dev,
+ "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n",
+ host->max_id, host->max_lun, host->max_channel);
+
+ if (scsi_add_host(hostdata->host, hostdata->dev))
+ goto add_host_failed;
+
+ /* we don't have a proper target_port_id so let's use the fake one */
+ memcpy(ids.port_id, hostdata->madapter_info.partition_name,
+ sizeof(ids.port_id));
+ ids.roles = SRP_RPORT_ROLE_TARGET;
+ rport = srp_rport_add(host, &ids);
+ if (IS_ERR(rport))
+ goto add_srp_port_failed;
+
+ /* Try to send an initialization message. Note that this is allowed
+ * to fail if the other end is not acive. In that case we don't
+ * want to scan
+ */
+ if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
+ || rc == H_RESOURCE) {
+ /*
+ * Wait around max init_timeout secs for the adapter to finish
+ * initializing. When we are done initializing, we will have a
+ * valid request_limit. We don't want Linux scanning before
+ * we are ready.
+ */
+ for (wait_switch = jiffies + (init_timeout * HZ);
+ time_before(jiffies, wait_switch) &&
+ atomic_read(&hostdata->request_limit) < 2;) {
+
+ msleep(10);
+ }
+
+ /* if we now have a valid request_limit, initiate a scan */
+ if (atomic_read(&hostdata->request_limit) > 0)
+ scsi_scan_host(host);
+ }
+
+ dev_set_drvdata(&vdev->dev, hostdata);
+ list_add_tail(&hostdata->host_list, &ibmvscsi_head);
+ return 0;
+
+ add_srp_port_failed:
+ scsi_remove_host(hostdata->host);
+ add_host_failed:
+ release_event_pool(&hostdata->pool, hostdata);
+ init_pool_failed:
+ ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);
+ kill_kthread:
+ kthread_stop(hostdata->work_thread);
+ init_crq_failed:
+ unmap_persist_bufs(hostdata);
+ persist_bufs_failed:
+ scsi_host_put(host);
+ scsi_host_alloc_failed:
+ return -1;
+}
+
+static int ibmvscsi_remove(struct vio_dev *vdev)
+{
+ struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
+ list_del(&hostdata->host_list);
+ unmap_persist_bufs(hostdata);
+ release_event_pool(&hostdata->pool, hostdata);
+ ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
+ max_events);
+
+ kthread_stop(hostdata->work_thread);
+ srp_remove_host(hostdata->host);
+ scsi_remove_host(hostdata->host);
+ scsi_host_put(hostdata->host);
+
+ return 0;
+}
+
+/**
+ * ibmvscsi_resume: Resume from suspend
+ * @dev: device struct
+ *
+ * We may have lost an interrupt across suspend/resume, so kick the
+ * interrupt handler
+ */
+static int ibmvscsi_resume(struct device *dev)
+{
+ struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
+ vio_disable_interrupts(to_vio_dev(hostdata->dev));
+ tasklet_schedule(&hostdata->srp_task);
+
+ return 0;
+}
+
+/**
+ * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
+ * support.
+ */
+static const struct vio_device_id ibmvscsi_device_table[] = {
+ {"vscsi", "IBM,v-scsi"},
+ { "", "" }
+};
+MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
+
+static const struct dev_pm_ops ibmvscsi_pm_ops = {
+ .resume = ibmvscsi_resume
+};
+
+static struct vio_driver ibmvscsi_driver = {
+ .id_table = ibmvscsi_device_table,
+ .probe = ibmvscsi_probe,
+ .remove = ibmvscsi_remove,
+ .get_desired_dma = ibmvscsi_get_desired_dma,
+ .name = "ibmvscsi",
+ .pm = &ibmvscsi_pm_ops,
+};
+
+static struct srp_function_template ibmvscsi_transport_functions = {
+};
+
+int __init ibmvscsi_module_init(void)
+{
+ int ret;
+
+ /* Ensure we have two requests to do error recovery */
+ driver_template.can_queue = max_requests;
+ max_events = max_requests + 2;
+
+ if (!firmware_has_feature(FW_FEATURE_VIO))
+ return -ENODEV;
+
+ ibmvscsi_transport_template =
+ srp_attach_transport(&ibmvscsi_transport_functions);
+ if (!ibmvscsi_transport_template)
+ return -ENOMEM;
+
+ ret = vio_register_driver(&ibmvscsi_driver);
+ if (ret)
+ srp_release_transport(ibmvscsi_transport_template);
+ return ret;
+}
+
+void __exit ibmvscsi_module_exit(void)
+{
+ vio_unregister_driver(&ibmvscsi_driver);
+ srp_release_transport(ibmvscsi_transport_template);
+}
+
+module_init(ibmvscsi_module_init);
+module_exit(ibmvscsi_module_exit);
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.h b/drivers/scsi/ibmvscsi/ibmvscsi.h
new file mode 100644
index 0000000..3a78755
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.h
@@ -0,0 +1,112 @@
+/* ------------------------------------------------------------
+ * ibmvscsi.h
+ * (C) Copyright IBM Corporation 1994, 2003
+ * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
+ * Santiago Leon (santil@us.ibm.com)
+ * Dave Boutcher (sleddog@us.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ *
+ * ------------------------------------------------------------
+ * Emulation of a SCSI host adapter for Virtual I/O devices
+ *
+ * This driver allows the Linux SCSI peripheral drivers to directly
+ * access devices in the hosting partition, either on an iSeries
+ * hypervisor system or a converged hypervisor system.
+ */
+#ifndef IBMVSCSI_H
+#define IBMVSCSI_H
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <scsi/viosrp.h>
+
+struct scsi_cmnd;
+struct Scsi_Host;
+
+/* Number of indirect bufs...the list of these has to fit in the
+ * additional data of the srp_cmd struct along with the indirect
+ * descriptor
+ */
+#define MAX_INDIRECT_BUFS 10
+
+#define IBMVSCSI_MAX_REQUESTS_DEFAULT 100
+#define IBMVSCSI_CMDS_PER_LUN_DEFAULT 16
+#define IBMVSCSI_MAX_SECTORS_DEFAULT 256 /* 32 * 8 = default max I/O 32 pages */
+#define IBMVSCSI_MAX_CMDS_PER_LUN 64
+#define IBMVSCSI_MAX_LUN 32
+
+/* ------------------------------------------------------------
+ * Data Structures
+ */
+/* an RPA command/response transport queue */
+struct crq_queue {
+ struct viosrp_crq *msgs;
+ int size, cur;
+ dma_addr_t msg_token;
+ spinlock_t lock;
+};
+
+/* a unit of work for the hosting partition */
+struct srp_event_struct {
+ union viosrp_iu *xfer_iu;
+ struct scsi_cmnd *cmnd;
+ struct list_head list;
+ void (*done) (struct srp_event_struct *);
+ struct viosrp_crq crq;
+ struct ibmvscsi_host_data *hostdata;
+ atomic_t free;
+ union viosrp_iu iu;
+ void (*cmnd_done) (struct scsi_cmnd *);
+ struct completion comp;
+ struct timer_list timer;
+ union viosrp_iu *sync_srp;
+ struct srp_direct_buf *ext_list;
+ dma_addr_t ext_list_token;
+};
+
+/* a pool of event structs for use */
+struct event_pool {
+ struct srp_event_struct *events;
+ u32 size;
+ int next;
+ union viosrp_iu *iu_storage;
+ dma_addr_t iu_token;
+};
+
+/* all driver data associated with a host adapter */
+struct ibmvscsi_host_data {
+ struct list_head host_list;
+ atomic_t request_limit;
+ int client_migrated;
+ int reset_crq;
+ int reenable_crq;
+ struct device *dev;
+ struct event_pool pool;
+ struct crq_queue queue;
+ struct tasklet_struct srp_task;
+ struct list_head sent;
+ struct Scsi_Host *host;
+ struct task_struct *work_thread;
+ wait_queue_head_t work_wait_q;
+ struct mad_adapter_info_data madapter_info;
+ struct capabilities caps;
+ dma_addr_t caps_addr;
+ dma_addr_t adapter_info_addr;
+};
+
+#endif /* IBMVSCSI_H */