v4.19.13 snapshot.
diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c
new file mode 100644
index 0000000..340b44d
--- /dev/null
+++ b/drivers/misc/sgi-xp/xpc_uv.c
@@ -0,0 +1,1813 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2008-2009 Silicon Graphics, Inc. All Rights Reserved.
+ */
+
+/*
+ * Cross Partition Communication (XPC) uv-based functions.
+ *
+ * Architecture specific implementation of common functions.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/cpu.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <asm/uv/uv_hub.h>
+#if defined CONFIG_X86_64
+#include <asm/uv/bios.h>
+#include <asm/uv/uv_irq.h>
+#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
+#include <asm/sn/intr.h>
+#include <asm/sn/sn_sal.h>
+#endif
+#include "../sgi-gru/gru.h"
+#include "../sgi-gru/grukservices.h"
+#include "xpc.h"
+
+#if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
+struct uv_IO_APIC_route_entry {
+ __u64 vector : 8,
+ delivery_mode : 3,
+ dest_mode : 1,
+ delivery_status : 1,
+ polarity : 1,
+ __reserved_1 : 1,
+ trigger : 1,
+ mask : 1,
+ __reserved_2 : 15,
+ dest : 32;
+};
+#endif
+
+static struct xpc_heartbeat_uv *xpc_heartbeat_uv;
+
+#define XPC_ACTIVATE_MSG_SIZE_UV (1 * GRU_CACHE_LINE_BYTES)
+#define XPC_ACTIVATE_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
+ XPC_ACTIVATE_MSG_SIZE_UV)
+#define XPC_ACTIVATE_IRQ_NAME "xpc_activate"
+
+#define XPC_NOTIFY_MSG_SIZE_UV (2 * GRU_CACHE_LINE_BYTES)
+#define XPC_NOTIFY_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
+ XPC_NOTIFY_MSG_SIZE_UV)
+#define XPC_NOTIFY_IRQ_NAME "xpc_notify"
+
+static int xpc_mq_node = -1;
+
+static struct xpc_gru_mq_uv *xpc_activate_mq_uv;
+static struct xpc_gru_mq_uv *xpc_notify_mq_uv;
+
+static int
+xpc_setup_partitions_uv(void)
+{
+ short partid;
+ struct xpc_partition_uv *part_uv;
+
+ for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
+ part_uv = &xpc_partitions[partid].sn.uv;
+
+ mutex_init(&part_uv->cached_activate_gru_mq_desc_mutex);
+ spin_lock_init(&part_uv->flags_lock);
+ part_uv->remote_act_state = XPC_P_AS_INACTIVE;
+ }
+ return 0;
+}
+
+static void
+xpc_teardown_partitions_uv(void)
+{
+ short partid;
+ struct xpc_partition_uv *part_uv;
+ unsigned long irq_flags;
+
+ for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
+ part_uv = &xpc_partitions[partid].sn.uv;
+
+ if (part_uv->cached_activate_gru_mq_desc != NULL) {
+ mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
+ spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
+ part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
+ spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
+ kfree(part_uv->cached_activate_gru_mq_desc);
+ part_uv->cached_activate_gru_mq_desc = NULL;
+ mutex_unlock(&part_uv->
+ cached_activate_gru_mq_desc_mutex);
+ }
+ }
+}
+
+static int
+xpc_get_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq, int cpu, char *irq_name)
+{
+ int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
+
+#if defined CONFIG_X86_64
+ mq->irq = uv_setup_irq(irq_name, cpu, mq->mmr_blade, mq->mmr_offset,
+ UV_AFFINITY_CPU);
+ if (mq->irq < 0)
+ return mq->irq;
+
+ mq->mmr_value = uv_read_global_mmr64(mmr_pnode, mq->mmr_offset);
+
+#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
+ if (strcmp(irq_name, XPC_ACTIVATE_IRQ_NAME) == 0)
+ mq->irq = SGI_XPC_ACTIVATE;
+ else if (strcmp(irq_name, XPC_NOTIFY_IRQ_NAME) == 0)
+ mq->irq = SGI_XPC_NOTIFY;
+ else
+ return -EINVAL;
+
+ mq->mmr_value = (unsigned long)cpu_physical_id(cpu) << 32 | mq->irq;
+ uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mq->mmr_value);
+#else
+ #error not a supported configuration
+#endif
+
+ return 0;
+}
+
+static void
+xpc_release_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq)
+{
+#if defined CONFIG_X86_64
+ uv_teardown_irq(mq->irq);
+
+#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
+ int mmr_pnode;
+ unsigned long mmr_value;
+
+ mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
+ mmr_value = 1UL << 16;
+
+ uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mmr_value);
+#else
+ #error not a supported configuration
+#endif
+}
+
+static int
+xpc_gru_mq_watchlist_alloc_uv(struct xpc_gru_mq_uv *mq)
+{
+ int ret;
+
+#if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
+ int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
+
+ ret = sn_mq_watchlist_alloc(mmr_pnode, (void *)uv_gpa(mq->address),
+ mq->order, &mq->mmr_offset);
+ if (ret < 0) {
+ dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
+ ret);
+ return -EBUSY;
+ }
+#elif defined CONFIG_X86_64
+ ret = uv_bios_mq_watchlist_alloc(uv_gpa(mq->address),
+ mq->order, &mq->mmr_offset);
+ if (ret < 0) {
+ dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
+ "ret=%d\n", ret);
+ return ret;
+ }
+#else
+ #error not a supported configuration
+#endif
+
+ mq->watchlist_num = ret;
+ return 0;
+}
+
+static void
+xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
+{
+ int ret;
+ int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
+
+#if defined CONFIG_X86_64
+ ret = uv_bios_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
+ BUG_ON(ret != BIOS_STATUS_SUCCESS);
+#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
+ ret = sn_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
+ BUG_ON(ret != SALRET_OK);
+#else
+ #error not a supported configuration
+#endif
+}
+
+static struct xpc_gru_mq_uv *
+xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
+ irq_handler_t irq_handler)
+{
+ enum xp_retval xp_ret;
+ int ret;
+ int nid;
+ int nasid;
+ int pg_order;
+ struct page *page;
+ struct xpc_gru_mq_uv *mq;
+ struct uv_IO_APIC_route_entry *mmr_value;
+
+ mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
+ if (mq == NULL) {
+ dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
+ "a xpc_gru_mq_uv structure\n");
+ ret = -ENOMEM;
+ goto out_0;
+ }
+
+ mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
+ GFP_KERNEL);
+ if (mq->gru_mq_desc == NULL) {
+ dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
+ "a gru_message_queue_desc structure\n");
+ ret = -ENOMEM;
+ goto out_1;
+ }
+
+ pg_order = get_order(mq_size);
+ mq->order = pg_order + PAGE_SHIFT;
+ mq_size = 1UL << mq->order;
+
+ mq->mmr_blade = uv_cpu_to_blade_id(cpu);
+
+ nid = cpu_to_node(cpu);
+ page = __alloc_pages_node(nid,
+ GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE,
+ pg_order);
+ if (page == NULL) {
+ dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
+ "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
+ ret = -ENOMEM;
+ goto out_2;
+ }
+ mq->address = page_address(page);
+
+ /* enable generation of irq when GRU mq operation occurs to this mq */
+ ret = xpc_gru_mq_watchlist_alloc_uv(mq);
+ if (ret != 0)
+ goto out_3;
+
+ ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
+ if (ret != 0)
+ goto out_4;
+
+ ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
+ if (ret != 0) {
+ dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
+ mq->irq, -ret);
+ goto out_5;
+ }
+
+ nasid = UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpu));
+
+ mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
+ ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
+ nasid, mmr_value->vector, mmr_value->dest);
+ if (ret != 0) {
+ dev_err(xpc_part, "gru_create_message_queue() returned "
+ "error=%d\n", ret);
+ ret = -EINVAL;
+ goto out_6;
+ }
+
+ /* allow other partitions to access this GRU mq */
+ xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
+ if (xp_ret != xpSuccess) {
+ ret = -EACCES;
+ goto out_6;
+ }
+
+ return mq;
+
+ /* something went wrong */
+out_6:
+ free_irq(mq->irq, NULL);
+out_5:
+ xpc_release_gru_mq_irq_uv(mq);
+out_4:
+ xpc_gru_mq_watchlist_free_uv(mq);
+out_3:
+ free_pages((unsigned long)mq->address, pg_order);
+out_2:
+ kfree(mq->gru_mq_desc);
+out_1:
+ kfree(mq);
+out_0:
+ return ERR_PTR(ret);
+}
+
+static void
+xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
+{
+ unsigned int mq_size;
+ int pg_order;
+ int ret;
+
+ /* disallow other partitions to access GRU mq */
+ mq_size = 1UL << mq->order;
+ ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
+ BUG_ON(ret != xpSuccess);
+
+ /* unregister irq handler and release mq irq/vector mapping */
+ free_irq(mq->irq, NULL);
+ xpc_release_gru_mq_irq_uv(mq);
+
+ /* disable generation of irq when GRU mq op occurs to this mq */
+ xpc_gru_mq_watchlist_free_uv(mq);
+
+ pg_order = mq->order - PAGE_SHIFT;
+ free_pages((unsigned long)mq->address, pg_order);
+
+ kfree(mq);
+}
+
+static enum xp_retval
+xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
+ size_t msg_size)
+{
+ enum xp_retval xp_ret;
+ int ret;
+
+ while (1) {
+ ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
+ if (ret == MQE_OK) {
+ xp_ret = xpSuccess;
+ break;
+ }
+
+ if (ret == MQE_QUEUE_FULL) {
+ dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
+ "error=MQE_QUEUE_FULL\n");
+ /* !!! handle QLimit reached; delay & try again */
+ /* ??? Do we add a limit to the number of retries? */
+ (void)msleep_interruptible(10);
+ } else if (ret == MQE_CONGESTION) {
+ dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
+ "error=MQE_CONGESTION\n");
+ /* !!! handle LB Overflow; simply try again */
+ /* ??? Do we add a limit to the number of retries? */
+ } else {
+ /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
+ dev_err(xpc_chan, "gru_send_message_gpa() returned "
+ "error=%d\n", ret);
+ xp_ret = xpGruSendMqError;
+ break;
+ }
+ }
+ return xp_ret;
+}
+
+static void
+xpc_process_activate_IRQ_rcvd_uv(void)
+{
+ unsigned long irq_flags;
+ short partid;
+ struct xpc_partition *part;
+ u8 act_state_req;
+
+ DBUG_ON(xpc_activate_IRQ_rcvd == 0);
+
+ spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+ for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
+ part = &xpc_partitions[partid];
+
+ if (part->sn.uv.act_state_req == 0)
+ continue;
+
+ xpc_activate_IRQ_rcvd--;
+ BUG_ON(xpc_activate_IRQ_rcvd < 0);
+
+ act_state_req = part->sn.uv.act_state_req;
+ part->sn.uv.act_state_req = 0;
+ spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+ if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
+ if (part->act_state == XPC_P_AS_INACTIVE)
+ xpc_activate_partition(part);
+ else if (part->act_state == XPC_P_AS_DEACTIVATING)
+ XPC_DEACTIVATE_PARTITION(part, xpReactivating);
+
+ } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
+ if (part->act_state == XPC_P_AS_INACTIVE)
+ xpc_activate_partition(part);
+ else
+ XPC_DEACTIVATE_PARTITION(part, xpReactivating);
+
+ } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
+ XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
+
+ } else {
+ BUG();
+ }
+
+ spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+ if (xpc_activate_IRQ_rcvd == 0)
+ break;
+ }
+ spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+}
+
+static void
+xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
+ struct xpc_activate_mq_msghdr_uv *msg_hdr,
+ int part_setup,
+ int *wakeup_hb_checker)
+{
+ unsigned long irq_flags;
+ struct xpc_partition_uv *part_uv = &part->sn.uv;
+ struct xpc_openclose_args *args;
+
+ part_uv->remote_act_state = msg_hdr->act_state;
+
+ switch (msg_hdr->type) {
+ case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
+ /* syncing of remote_act_state was just done above */
+ break;
+
+ case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
+ struct xpc_activate_mq_msg_activate_req_uv *msg;
+
+ /*
+ * ??? Do we deal here with ts_jiffies being different
+ * ??? if act_state != XPC_P_AS_INACTIVE instead of
+ * ??? below?
+ */
+ msg = container_of(msg_hdr, struct
+ xpc_activate_mq_msg_activate_req_uv, hdr);
+
+ spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+ if (part_uv->act_state_req == 0)
+ xpc_activate_IRQ_rcvd++;
+ part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
+ part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
+ part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
+ part_uv->heartbeat_gpa = msg->heartbeat_gpa;
+
+ if (msg->activate_gru_mq_desc_gpa !=
+ part_uv->activate_gru_mq_desc_gpa) {
+ spin_lock(&part_uv->flags_lock);
+ part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
+ spin_unlock(&part_uv->flags_lock);
+ part_uv->activate_gru_mq_desc_gpa =
+ msg->activate_gru_mq_desc_gpa;
+ }
+ spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+ (*wakeup_hb_checker)++;
+ break;
+ }
+ case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
+ struct xpc_activate_mq_msg_deactivate_req_uv *msg;
+
+ msg = container_of(msg_hdr, struct
+ xpc_activate_mq_msg_deactivate_req_uv, hdr);
+
+ spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+ if (part_uv->act_state_req == 0)
+ xpc_activate_IRQ_rcvd++;
+ part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
+ part_uv->reason = msg->reason;
+ spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+ (*wakeup_hb_checker)++;
+ return;
+ }
+ case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
+ struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
+
+ if (!part_setup)
+ break;
+
+ msg = container_of(msg_hdr, struct
+ xpc_activate_mq_msg_chctl_closerequest_uv,
+ hdr);
+ args = &part->remote_openclose_args[msg->ch_number];
+ args->reason = msg->reason;
+
+ spin_lock_irqsave(&part->chctl_lock, irq_flags);
+ part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
+ spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+ xpc_wakeup_channel_mgr(part);
+ break;
+ }
+ case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
+ struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
+
+ if (!part_setup)
+ break;
+
+ msg = container_of(msg_hdr, struct
+ xpc_activate_mq_msg_chctl_closereply_uv,
+ hdr);
+
+ spin_lock_irqsave(&part->chctl_lock, irq_flags);
+ part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
+ spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+ xpc_wakeup_channel_mgr(part);
+ break;
+ }
+ case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
+ struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
+
+ if (!part_setup)
+ break;
+
+ msg = container_of(msg_hdr, struct
+ xpc_activate_mq_msg_chctl_openrequest_uv,
+ hdr);
+ args = &part->remote_openclose_args[msg->ch_number];
+ args->entry_size = msg->entry_size;
+ args->local_nentries = msg->local_nentries;
+
+ spin_lock_irqsave(&part->chctl_lock, irq_flags);
+ part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
+ spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+ xpc_wakeup_channel_mgr(part);
+ break;
+ }
+ case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
+ struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
+
+ if (!part_setup)
+ break;
+
+ msg = container_of(msg_hdr, struct
+ xpc_activate_mq_msg_chctl_openreply_uv, hdr);
+ args = &part->remote_openclose_args[msg->ch_number];
+ args->remote_nentries = msg->remote_nentries;
+ args->local_nentries = msg->local_nentries;
+ args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
+
+ spin_lock_irqsave(&part->chctl_lock, irq_flags);
+ part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
+ spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+ xpc_wakeup_channel_mgr(part);
+ break;
+ }
+ case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
+ struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
+
+ if (!part_setup)
+ break;
+
+ msg = container_of(msg_hdr, struct
+ xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
+ spin_lock_irqsave(&part->chctl_lock, irq_flags);
+ part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
+ spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+ xpc_wakeup_channel_mgr(part);
+ }
+ case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
+ spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
+ part_uv->flags |= XPC_P_ENGAGED_UV;
+ spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
+ break;
+
+ case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
+ spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
+ part_uv->flags &= ~XPC_P_ENGAGED_UV;
+ spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
+ break;
+
+ default:
+ dev_err(xpc_part, "received unknown activate_mq msg type=%d "
+ "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
+
+ /* get hb checker to deactivate from the remote partition */
+ spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+ if (part_uv->act_state_req == 0)
+ xpc_activate_IRQ_rcvd++;
+ part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
+ part_uv->reason = xpBadMsgType;
+ spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+ (*wakeup_hb_checker)++;
+ return;
+ }
+
+ if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
+ part->remote_rp_ts_jiffies != 0) {
+ /*
+ * ??? Does what we do here need to be sensitive to
+ * ??? act_state or remote_act_state?
+ */
+ spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+ if (part_uv->act_state_req == 0)
+ xpc_activate_IRQ_rcvd++;
+ part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
+ spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+ (*wakeup_hb_checker)++;
+ }
+}
+
+static irqreturn_t
+xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
+{
+ struct xpc_activate_mq_msghdr_uv *msg_hdr;
+ short partid;
+ struct xpc_partition *part;
+ int wakeup_hb_checker = 0;
+ int part_referenced;
+
+ while (1) {
+ msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
+ if (msg_hdr == NULL)
+ break;
+
+ partid = msg_hdr->partid;
+ if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
+ dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
+ "received invalid partid=0x%x in message\n",
+ partid);
+ } else {
+ part = &xpc_partitions[partid];
+
+ part_referenced = xpc_part_ref(part);
+ xpc_handle_activate_mq_msg_uv(part, msg_hdr,
+ part_referenced,
+ &wakeup_hb_checker);
+ if (part_referenced)
+ xpc_part_deref(part);
+ }
+
+ gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
+ }
+
+ if (wakeup_hb_checker)
+ wake_up_interruptible(&xpc_activate_IRQ_wq);
+
+ return IRQ_HANDLED;
+}
+
+static enum xp_retval
+xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
+ unsigned long gru_mq_desc_gpa)
+{
+ enum xp_retval ret;
+
+ ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
+ sizeof(struct gru_message_queue_desc));
+ if (ret == xpSuccess)
+ gru_mq_desc->mq = NULL;
+
+ return ret;
+}
+
+static enum xp_retval
+xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
+ int msg_type)
+{
+ struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
+ struct xpc_partition_uv *part_uv = &part->sn.uv;
+ struct gru_message_queue_desc *gru_mq_desc;
+ unsigned long irq_flags;
+ enum xp_retval ret;
+
+ DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
+
+ msg_hdr->type = msg_type;
+ msg_hdr->partid = xp_partition_id;
+ msg_hdr->act_state = part->act_state;
+ msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
+
+ mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
+again:
+ if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
+ gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
+ if (gru_mq_desc == NULL) {
+ gru_mq_desc = kmalloc(sizeof(struct
+ gru_message_queue_desc),
+ GFP_KERNEL);
+ if (gru_mq_desc == NULL) {
+ ret = xpNoMemory;
+ goto done;
+ }
+ part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
+ }
+
+ ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
+ part_uv->
+ activate_gru_mq_desc_gpa);
+ if (ret != xpSuccess)
+ goto done;
+
+ spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
+ part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
+ spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
+ }
+
+ /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
+ ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
+ msg_size);
+ if (ret != xpSuccess) {
+ smp_rmb(); /* ensure a fresh copy of part_uv->flags */
+ if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
+ goto again;
+ }
+done:
+ mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
+ return ret;
+}
+
+static void
+xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
+ size_t msg_size, int msg_type)
+{
+ enum xp_retval ret;
+
+ ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
+ if (unlikely(ret != xpSuccess))
+ XPC_DEACTIVATE_PARTITION(part, ret);
+}
+
+static void
+xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
+ void *msg, size_t msg_size, int msg_type)
+{
+ struct xpc_partition *part = &xpc_partitions[ch->partid];
+ enum xp_retval ret;
+
+ ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
+ if (unlikely(ret != xpSuccess)) {
+ if (irq_flags != NULL)
+ spin_unlock_irqrestore(&ch->lock, *irq_flags);
+
+ XPC_DEACTIVATE_PARTITION(part, ret);
+
+ if (irq_flags != NULL)
+ spin_lock_irqsave(&ch->lock, *irq_flags);
+ }
+}
+
+static void
+xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
+{
+ unsigned long irq_flags;
+ struct xpc_partition_uv *part_uv = &part->sn.uv;
+
+ /*
+ * !!! Make our side think that the remote partition sent an activate
+ * !!! mq message our way by doing what the activate IRQ handler would
+ * !!! do had one really been sent.
+ */
+
+ spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+ if (part_uv->act_state_req == 0)
+ xpc_activate_IRQ_rcvd++;
+ part_uv->act_state_req = act_state_req;
+ spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+ wake_up_interruptible(&xpc_activate_IRQ_wq);
+}
+
+static enum xp_retval
+xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
+ size_t *len)
+{
+ s64 status;
+ enum xp_retval ret;
+
+#if defined CONFIG_X86_64
+ status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
+ (u64 *)len);
+ if (status == BIOS_STATUS_SUCCESS)
+ ret = xpSuccess;
+ else if (status == BIOS_STATUS_MORE_PASSES)
+ ret = xpNeedMoreInfo;
+ else
+ ret = xpBiosError;
+
+#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
+ status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
+ if (status == SALRET_OK)
+ ret = xpSuccess;
+ else if (status == SALRET_MORE_PASSES)
+ ret = xpNeedMoreInfo;
+ else
+ ret = xpSalError;
+
+#else
+ #error not a supported configuration
+#endif
+
+ return ret;
+}
+
+static int
+xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
+{
+ xpc_heartbeat_uv =
+ &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
+ rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
+ rp->sn.uv.activate_gru_mq_desc_gpa =
+ uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
+ return 0;
+}
+
+static void
+xpc_allow_hb_uv(short partid)
+{
+}
+
+static void
+xpc_disallow_hb_uv(short partid)
+{
+}
+
+static void
+xpc_disallow_all_hbs_uv(void)
+{
+}
+
+static void
+xpc_increment_heartbeat_uv(void)
+{
+ xpc_heartbeat_uv->value++;
+}
+
+static void
+xpc_offline_heartbeat_uv(void)
+{
+ xpc_increment_heartbeat_uv();
+ xpc_heartbeat_uv->offline = 1;
+}
+
+static void
+xpc_online_heartbeat_uv(void)
+{
+ xpc_increment_heartbeat_uv();
+ xpc_heartbeat_uv->offline = 0;
+}
+
+static void
+xpc_heartbeat_init_uv(void)
+{
+ xpc_heartbeat_uv->value = 1;
+ xpc_heartbeat_uv->offline = 0;
+}
+
+static void
+xpc_heartbeat_exit_uv(void)
+{
+ xpc_offline_heartbeat_uv();
+}
+
+static enum xp_retval
+xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
+{
+ struct xpc_partition_uv *part_uv = &part->sn.uv;
+ enum xp_retval ret;
+
+ ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
+ part_uv->heartbeat_gpa,
+ sizeof(struct xpc_heartbeat_uv));
+ if (ret != xpSuccess)
+ return ret;
+
+ if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
+ !part_uv->cached_heartbeat.offline) {
+
+ ret = xpNoHeartbeat;
+ } else {
+ part->last_heartbeat = part_uv->cached_heartbeat.value;
+ }
+ return ret;
+}
+
+static void
+xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
+ unsigned long remote_rp_gpa, int nasid)
+{
+ short partid = remote_rp->SAL_partid;
+ struct xpc_partition *part = &xpc_partitions[partid];
+ struct xpc_activate_mq_msg_activate_req_uv msg;
+
+ part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
+ part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
+ part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
+ part->sn.uv.activate_gru_mq_desc_gpa =
+ remote_rp->sn.uv.activate_gru_mq_desc_gpa;
+
+ /*
+ * ??? Is it a good idea to make this conditional on what is
+ * ??? potentially stale state information?
+ */
+ if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
+ msg.rp_gpa = uv_gpa(xpc_rsvd_page);
+ msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
+ msg.activate_gru_mq_desc_gpa =
+ xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
+ xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
+ }
+
+ if (part->act_state == XPC_P_AS_INACTIVE)
+ xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
+}
+
+static void
+xpc_request_partition_reactivation_uv(struct xpc_partition *part)
+{
+ xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
+}
+
+static void
+xpc_request_partition_deactivation_uv(struct xpc_partition *part)
+{
+ struct xpc_activate_mq_msg_deactivate_req_uv msg;
+
+ /*
+ * ??? Is it a good idea to make this conditional on what is
+ * ??? potentially stale state information?
+ */
+ if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
+ part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
+
+ msg.reason = part->reason;
+ xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
+ }
+}
+
+static void
+xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
+{
+ /* nothing needs to be done */
+ return;
+}
+
+static void
+xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
+{
+ head->first = NULL;
+ head->last = NULL;
+ spin_lock_init(&head->lock);
+ head->n_entries = 0;
+}
+
+static void *
+xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
+{
+ unsigned long irq_flags;
+ struct xpc_fifo_entry_uv *first;
+
+ spin_lock_irqsave(&head->lock, irq_flags);
+ first = head->first;
+ if (head->first != NULL) {
+ head->first = first->next;
+ if (head->first == NULL)
+ head->last = NULL;
+
+ head->n_entries--;
+ BUG_ON(head->n_entries < 0);
+
+ first->next = NULL;
+ }
+ spin_unlock_irqrestore(&head->lock, irq_flags);
+ return first;
+}
+
+static void
+xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
+ struct xpc_fifo_entry_uv *last)
+{
+ unsigned long irq_flags;
+
+ last->next = NULL;
+ spin_lock_irqsave(&head->lock, irq_flags);
+ if (head->last != NULL)
+ head->last->next = last;
+ else
+ head->first = last;
+ head->last = last;
+ head->n_entries++;
+ spin_unlock_irqrestore(&head->lock, irq_flags);
+}
+
+static int
+xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
+{
+ return head->n_entries;
+}
+
+/*
+ * Setup the channel structures that are uv specific.
+ */
+static enum xp_retval
+xpc_setup_ch_structures_uv(struct xpc_partition *part)
+{
+ struct xpc_channel_uv *ch_uv;
+ int ch_number;
+
+ for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
+ ch_uv = &part->channels[ch_number].sn.uv;
+
+ xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
+ xpc_init_fifo_uv(&ch_uv->recv_msg_list);
+ }
+
+ return xpSuccess;
+}
+
+/*
+ * Teardown the channel structures that are uv specific.
+ */
+static void
+xpc_teardown_ch_structures_uv(struct xpc_partition *part)
+{
+ /* nothing needs to be done */
+ return;
+}
+
+static enum xp_retval
+xpc_make_first_contact_uv(struct xpc_partition *part)
+{
+ struct xpc_activate_mq_msg_uv msg;
+
+ /*
+ * We send a sync msg to get the remote partition's remote_act_state
+ * updated to our current act_state which at this point should
+ * be XPC_P_AS_ACTIVATING.
+ */
+ xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
+
+ while (!((part->sn.uv.remote_act_state == XPC_P_AS_ACTIVATING) ||
+ (part->sn.uv.remote_act_state == XPC_P_AS_ACTIVE))) {
+
+ dev_dbg(xpc_part, "waiting to make first contact with "
+ "partition %d\n", XPC_PARTID(part));
+
+ /* wait a 1/4 of a second or so */
+ (void)msleep_interruptible(250);
+
+ if (part->act_state == XPC_P_AS_DEACTIVATING)
+ return part->reason;
+ }
+
+ return xpSuccess;
+}
+
+static u64
+xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
+{
+ unsigned long irq_flags;
+ union xpc_channel_ctl_flags chctl;
+
+ spin_lock_irqsave(&part->chctl_lock, irq_flags);
+ chctl = part->chctl;
+ if (chctl.all_flags != 0)
+ part->chctl.all_flags = 0;
+
+ spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+ return chctl.all_flags;
+}
+
+static enum xp_retval
+xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
+{
+ struct xpc_channel_uv *ch_uv = &ch->sn.uv;
+ struct xpc_send_msg_slot_uv *msg_slot;
+ unsigned long irq_flags;
+ int nentries;
+ int entry;
+ size_t nbytes;
+
+ for (nentries = ch->local_nentries; nentries > 0; nentries--) {
+ nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
+ ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
+ if (ch_uv->send_msg_slots == NULL)
+ continue;
+
+ for (entry = 0; entry < nentries; entry++) {
+ msg_slot = &ch_uv->send_msg_slots[entry];
+
+ msg_slot->msg_slot_number = entry;
+ xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
+ &msg_slot->next);
+ }
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ if (nentries < ch->local_nentries)
+ ch->local_nentries = nentries;
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return xpSuccess;
+ }
+
+ return xpNoMemory;
+}
+
+static enum xp_retval
+xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
+{
+ struct xpc_channel_uv *ch_uv = &ch->sn.uv;
+ struct xpc_notify_mq_msg_uv *msg_slot;
+ unsigned long irq_flags;
+ int nentries;
+ int entry;
+ size_t nbytes;
+
+ for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
+ nbytes = nentries * ch->entry_size;
+ ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
+ if (ch_uv->recv_msg_slots == NULL)
+ continue;
+
+ for (entry = 0; entry < nentries; entry++) {
+ msg_slot = ch_uv->recv_msg_slots +
+ entry * ch->entry_size;
+
+ msg_slot->hdr.msg_slot_number = entry;
+ }
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ if (nentries < ch->remote_nentries)
+ ch->remote_nentries = nentries;
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return xpSuccess;
+ }
+
+ return xpNoMemory;
+}
+
+/*
+ * Allocate msg_slots associated with the channel.
+ */
+static enum xp_retval
+xpc_setup_msg_structures_uv(struct xpc_channel *ch)
+{
+ static enum xp_retval ret;
+ struct xpc_channel_uv *ch_uv = &ch->sn.uv;
+
+ DBUG_ON(ch->flags & XPC_C_SETUP);
+
+ ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
+ gru_message_queue_desc),
+ GFP_KERNEL);
+ if (ch_uv->cached_notify_gru_mq_desc == NULL)
+ return xpNoMemory;
+
+ ret = xpc_allocate_send_msg_slot_uv(ch);
+ if (ret == xpSuccess) {
+
+ ret = xpc_allocate_recv_msg_slot_uv(ch);
+ if (ret != xpSuccess) {
+ kfree(ch_uv->send_msg_slots);
+ xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
+ }
+ }
+ return ret;
+}
+
+/*
+ * Free up msg_slots and clear other stuff that were setup for the specified
+ * channel.
+ */
+static void
+xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
+{
+ struct xpc_channel_uv *ch_uv = &ch->sn.uv;
+
+ DBUG_ON(!spin_is_locked(&ch->lock));
+
+ kfree(ch_uv->cached_notify_gru_mq_desc);
+ ch_uv->cached_notify_gru_mq_desc = NULL;
+
+ if (ch->flags & XPC_C_SETUP) {
+ xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
+ kfree(ch_uv->send_msg_slots);
+ xpc_init_fifo_uv(&ch_uv->recv_msg_list);
+ kfree(ch_uv->recv_msg_slots);
+ }
+}
+
+static void
+xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
+
+ msg.ch_number = ch->number;
+ msg.reason = ch->reason;
+ xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
+}
+
+static void
+xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ struct xpc_activate_mq_msg_chctl_closereply_uv msg;
+
+ msg.ch_number = ch->number;
+ xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
+}
+
+static void
+xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
+
+ msg.ch_number = ch->number;
+ msg.entry_size = ch->entry_size;
+ msg.local_nentries = ch->local_nentries;
+ xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
+}
+
+static void
+xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ struct xpc_activate_mq_msg_chctl_openreply_uv msg;
+
+ msg.ch_number = ch->number;
+ msg.local_nentries = ch->local_nentries;
+ msg.remote_nentries = ch->remote_nentries;
+ msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
+ xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
+}
+
+static void
+xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
+
+ msg.ch_number = ch->number;
+ xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
+}
+
+static void
+xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
+{
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&part->chctl_lock, irq_flags);
+ part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
+ spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+ xpc_wakeup_channel_mgr(part);
+}
+
+static enum xp_retval
+xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
+ unsigned long gru_mq_desc_gpa)
+{
+ struct xpc_channel_uv *ch_uv = &ch->sn.uv;
+
+ DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
+ return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
+ gru_mq_desc_gpa);
+}
+
+static void
+xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
+{
+ struct xpc_activate_mq_msg_uv msg;
+
+ xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
+}
+
+static void
+xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
+{
+ struct xpc_activate_mq_msg_uv msg;
+
+ xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
+}
+
+static void
+xpc_assume_partition_disengaged_uv(short partid)
+{
+ struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
+ part_uv->flags &= ~XPC_P_ENGAGED_UV;
+ spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
+}
+
+static int
+xpc_partition_engaged_uv(short partid)
+{
+ return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
+}
+
+static int
+xpc_any_partition_engaged_uv(void)
+{
+ struct xpc_partition_uv *part_uv;
+ short partid;
+
+ for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
+ part_uv = &xpc_partitions[partid].sn.uv;
+ if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
+ return 1;
+ }
+ return 0;
+}
+
+static enum xp_retval
+xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
+ struct xpc_send_msg_slot_uv **address_of_msg_slot)
+{
+ enum xp_retval ret;
+ struct xpc_send_msg_slot_uv *msg_slot;
+ struct xpc_fifo_entry_uv *entry;
+
+ while (1) {
+ entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
+ if (entry != NULL)
+ break;
+
+ if (flags & XPC_NOWAIT)
+ return xpNoWait;
+
+ ret = xpc_allocate_msg_wait(ch);
+ if (ret != xpInterrupted && ret != xpTimeout)
+ return ret;
+ }
+
+ msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
+ *address_of_msg_slot = msg_slot;
+ return xpSuccess;
+}
+
+static void
+xpc_free_msg_slot_uv(struct xpc_channel *ch,
+ struct xpc_send_msg_slot_uv *msg_slot)
+{
+ xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
+
+ /* wakeup anyone waiting for a free msg slot */
+ if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
+ wake_up(&ch->msg_allocate_wq);
+}
+
+static void
+xpc_notify_sender_uv(struct xpc_channel *ch,
+ struct xpc_send_msg_slot_uv *msg_slot,
+ enum xp_retval reason)
+{
+ xpc_notify_func func = msg_slot->func;
+
+ if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
+
+ atomic_dec(&ch->n_to_notify);
+
+ dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
+ "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
+ msg_slot->msg_slot_number, ch->partid, ch->number);
+
+ func(reason, ch->partid, ch->number, msg_slot->key);
+
+ dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
+ "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
+ msg_slot->msg_slot_number, ch->partid, ch->number);
+ }
+}
+
+static void
+xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
+ struct xpc_notify_mq_msg_uv *msg)
+{
+ struct xpc_send_msg_slot_uv *msg_slot;
+ int entry = msg->hdr.msg_slot_number % ch->local_nentries;
+
+ msg_slot = &ch->sn.uv.send_msg_slots[entry];
+
+ BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
+ msg_slot->msg_slot_number += ch->local_nentries;
+
+ if (msg_slot->func != NULL)
+ xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
+
+ xpc_free_msg_slot_uv(ch, msg_slot);
+}
+
+static void
+xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
+ struct xpc_notify_mq_msg_uv *msg)
+{
+ struct xpc_partition_uv *part_uv = &part->sn.uv;
+ struct xpc_channel *ch;
+ struct xpc_channel_uv *ch_uv;
+ struct xpc_notify_mq_msg_uv *msg_slot;
+ unsigned long irq_flags;
+ int ch_number = msg->hdr.ch_number;
+
+ if (unlikely(ch_number >= part->nchannels)) {
+ dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
+ "channel number=0x%x in message from partid=%d\n",
+ ch_number, XPC_PARTID(part));
+
+ /* get hb checker to deactivate from the remote partition */
+ spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+ if (part_uv->act_state_req == 0)
+ xpc_activate_IRQ_rcvd++;
+ part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
+ part_uv->reason = xpBadChannelNumber;
+ spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+ wake_up_interruptible(&xpc_activate_IRQ_wq);
+ return;
+ }
+
+ ch = &part->channels[ch_number];
+ xpc_msgqueue_ref(ch);
+
+ if (!(ch->flags & XPC_C_CONNECTED)) {
+ xpc_msgqueue_deref(ch);
+ return;
+ }
+
+ /* see if we're really dealing with an ACK for a previously sent msg */
+ if (msg->hdr.size == 0) {
+ xpc_handle_notify_mq_ack_uv(ch, msg);
+ xpc_msgqueue_deref(ch);
+ return;
+ }
+
+ /* we're dealing with a normal message sent via the notify_mq */
+ ch_uv = &ch->sn.uv;
+
+ msg_slot = ch_uv->recv_msg_slots +
+ (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
+
+ BUG_ON(msg_slot->hdr.size != 0);
+
+ memcpy(msg_slot, msg, msg->hdr.size);
+
+ xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
+
+ if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
+ /*
+ * If there is an existing idle kthread get it to deliver
+ * the payload, otherwise we'll have to get the channel mgr
+ * for this partition to create a kthread to do the delivery.
+ */
+ if (atomic_read(&ch->kthreads_idle) > 0)
+ wake_up_nr(&ch->idle_wq, 1);
+ else
+ xpc_send_chctl_local_msgrequest_uv(part, ch->number);
+ }
+ xpc_msgqueue_deref(ch);
+}
+
+static irqreturn_t
+xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
+{
+ struct xpc_notify_mq_msg_uv *msg;
+ short partid;
+ struct xpc_partition *part;
+
+ while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
+ NULL) {
+
+ partid = msg->hdr.partid;
+ if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
+ dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
+ "invalid partid=0x%x in message\n", partid);
+ } else {
+ part = &xpc_partitions[partid];
+
+ if (xpc_part_ref(part)) {
+ xpc_handle_notify_mq_msg_uv(part, msg);
+ xpc_part_deref(part);
+ }
+ }
+
+ gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int
+xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
+{
+ return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
+}
+
+static void
+xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
+{
+ struct xpc_channel *ch = &part->channels[ch_number];
+ int ndeliverable_payloads;
+
+ xpc_msgqueue_ref(ch);
+
+ ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
+
+ if (ndeliverable_payloads > 0 &&
+ (ch->flags & XPC_C_CONNECTED) &&
+ (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
+
+ xpc_activate_kthreads(ch, ndeliverable_payloads);
+ }
+
+ xpc_msgqueue_deref(ch);
+}
+
+static enum xp_retval
+xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
+ u16 payload_size, u8 notify_type, xpc_notify_func func,
+ void *key)
+{
+ enum xp_retval ret = xpSuccess;
+ struct xpc_send_msg_slot_uv *msg_slot = NULL;
+ struct xpc_notify_mq_msg_uv *msg;
+ u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
+ size_t msg_size;
+
+ DBUG_ON(notify_type != XPC_N_CALL);
+
+ msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
+ if (msg_size > ch->entry_size)
+ return xpPayloadTooBig;
+
+ xpc_msgqueue_ref(ch);
+
+ if (ch->flags & XPC_C_DISCONNECTING) {
+ ret = ch->reason;
+ goto out_1;
+ }
+ if (!(ch->flags & XPC_C_CONNECTED)) {
+ ret = xpNotConnected;
+ goto out_1;
+ }
+
+ ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
+ if (ret != xpSuccess)
+ goto out_1;
+
+ if (func != NULL) {
+ atomic_inc(&ch->n_to_notify);
+
+ msg_slot->key = key;
+ smp_wmb(); /* a non-NULL func must hit memory after the key */
+ msg_slot->func = func;
+
+ if (ch->flags & XPC_C_DISCONNECTING) {
+ ret = ch->reason;
+ goto out_2;
+ }
+ }
+
+ msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
+ msg->hdr.partid = xp_partition_id;
+ msg->hdr.ch_number = ch->number;
+ msg->hdr.size = msg_size;
+ msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
+ memcpy(&msg->payload, payload, payload_size);
+
+ ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
+ msg_size);
+ if (ret == xpSuccess)
+ goto out_1;
+
+ XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
+out_2:
+ if (func != NULL) {
+ /*
+ * Try to NULL the msg_slot's func field. If we fail, then
+ * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
+ * case we need to pretend we succeeded to send the message
+ * since the user will get a callout for the disconnect error
+ * by xpc_notify_senders_of_disconnect_uv(), and to also get an
+ * error returned here will confuse them. Additionally, since
+ * in this case the channel is being disconnected we don't need
+ * to put the the msg_slot back on the free list.
+ */
+ if (cmpxchg(&msg_slot->func, func, NULL) != func) {
+ ret = xpSuccess;
+ goto out_1;
+ }
+
+ msg_slot->key = NULL;
+ atomic_dec(&ch->n_to_notify);
+ }
+ xpc_free_msg_slot_uv(ch, msg_slot);
+out_1:
+ xpc_msgqueue_deref(ch);
+ return ret;
+}
+
+/*
+ * Tell the callers of xpc_send_notify() that the status of their payloads
+ * is unknown because the channel is now disconnecting.
+ *
+ * We don't worry about putting these msg_slots on the free list since the
+ * msg_slots themselves are about to be kfree'd.
+ */
+static void
+xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
+{
+ struct xpc_send_msg_slot_uv *msg_slot;
+ int entry;
+
+ DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
+
+ for (entry = 0; entry < ch->local_nentries; entry++) {
+
+ if (atomic_read(&ch->n_to_notify) == 0)
+ break;
+
+ msg_slot = &ch->sn.uv.send_msg_slots[entry];
+ if (msg_slot->func != NULL)
+ xpc_notify_sender_uv(ch, msg_slot, ch->reason);
+ }
+}
+
+/*
+ * Get the next deliverable message's payload.
+ */
+static void *
+xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
+{
+ struct xpc_fifo_entry_uv *entry;
+ struct xpc_notify_mq_msg_uv *msg;
+ void *payload = NULL;
+
+ if (!(ch->flags & XPC_C_DISCONNECTING)) {
+ entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
+ if (entry != NULL) {
+ msg = container_of(entry, struct xpc_notify_mq_msg_uv,
+ hdr.u.next);
+ payload = &msg->payload;
+ }
+ }
+ return payload;
+}
+
+static void
+xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
+{
+ struct xpc_notify_mq_msg_uv *msg;
+ enum xp_retval ret;
+
+ msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
+
+ /* return an ACK to the sender of this message */
+
+ msg->hdr.partid = xp_partition_id;
+ msg->hdr.size = 0; /* size of zero indicates this is an ACK */
+
+ ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
+ sizeof(struct xpc_notify_mq_msghdr_uv));
+ if (ret != xpSuccess)
+ XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
+}
+
+static struct xpc_arch_operations xpc_arch_ops_uv = {
+ .setup_partitions = xpc_setup_partitions_uv,
+ .teardown_partitions = xpc_teardown_partitions_uv,
+ .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
+ .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
+ .setup_rsvd_page = xpc_setup_rsvd_page_uv,
+
+ .allow_hb = xpc_allow_hb_uv,
+ .disallow_hb = xpc_disallow_hb_uv,
+ .disallow_all_hbs = xpc_disallow_all_hbs_uv,
+ .increment_heartbeat = xpc_increment_heartbeat_uv,
+ .offline_heartbeat = xpc_offline_heartbeat_uv,
+ .online_heartbeat = xpc_online_heartbeat_uv,
+ .heartbeat_init = xpc_heartbeat_init_uv,
+ .heartbeat_exit = xpc_heartbeat_exit_uv,
+ .get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
+
+ .request_partition_activation =
+ xpc_request_partition_activation_uv,
+ .request_partition_reactivation =
+ xpc_request_partition_reactivation_uv,
+ .request_partition_deactivation =
+ xpc_request_partition_deactivation_uv,
+ .cancel_partition_deactivation_request =
+ xpc_cancel_partition_deactivation_request_uv,
+
+ .setup_ch_structures = xpc_setup_ch_structures_uv,
+ .teardown_ch_structures = xpc_teardown_ch_structures_uv,
+
+ .make_first_contact = xpc_make_first_contact_uv,
+
+ .get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
+ .send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
+ .send_chctl_closereply = xpc_send_chctl_closereply_uv,
+ .send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
+ .send_chctl_openreply = xpc_send_chctl_openreply_uv,
+ .send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
+ .process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
+
+ .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
+
+ .setup_msg_structures = xpc_setup_msg_structures_uv,
+ .teardown_msg_structures = xpc_teardown_msg_structures_uv,
+
+ .indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
+ .indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
+ .assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
+ .partition_engaged = xpc_partition_engaged_uv,
+ .any_partition_engaged = xpc_any_partition_engaged_uv,
+
+ .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
+ .send_payload = xpc_send_payload_uv,
+ .get_deliverable_payload = xpc_get_deliverable_payload_uv,
+ .received_payload = xpc_received_payload_uv,
+ .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
+};
+
+static int
+xpc_init_mq_node(int nid)
+{
+ int cpu;
+
+ get_online_cpus();
+
+ for_each_cpu(cpu, cpumask_of_node(nid)) {
+ xpc_activate_mq_uv =
+ xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, nid,
+ XPC_ACTIVATE_IRQ_NAME,
+ xpc_handle_activate_IRQ_uv);
+ if (!IS_ERR(xpc_activate_mq_uv))
+ break;
+ }
+ if (IS_ERR(xpc_activate_mq_uv)) {
+ put_online_cpus();
+ return PTR_ERR(xpc_activate_mq_uv);
+ }
+
+ for_each_cpu(cpu, cpumask_of_node(nid)) {
+ xpc_notify_mq_uv =
+ xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, nid,
+ XPC_NOTIFY_IRQ_NAME,
+ xpc_handle_notify_IRQ_uv);
+ if (!IS_ERR(xpc_notify_mq_uv))
+ break;
+ }
+ if (IS_ERR(xpc_notify_mq_uv)) {
+ xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
+ put_online_cpus();
+ return PTR_ERR(xpc_notify_mq_uv);
+ }
+
+ put_online_cpus();
+ return 0;
+}
+
+int
+xpc_init_uv(void)
+{
+ int nid;
+ int ret = 0;
+
+ xpc_arch_ops = xpc_arch_ops_uv;
+
+ if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
+ dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
+ XPC_MSG_HDR_MAX_SIZE);
+ return -E2BIG;
+ }
+
+ if (xpc_mq_node < 0)
+ for_each_online_node(nid) {
+ ret = xpc_init_mq_node(nid);
+
+ if (!ret)
+ break;
+ }
+ else
+ ret = xpc_init_mq_node(xpc_mq_node);
+
+ if (ret < 0)
+ dev_err(xpc_part, "xpc_init_mq_node() returned error=%d\n",
+ -ret);
+
+ return ret;
+}
+
+void
+xpc_exit_uv(void)
+{
+ xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
+ xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
+}
+
+module_param(xpc_mq_node, int, 0);
+MODULE_PARM_DESC(xpc_mq_node, "Node number on which to allocate message queues.");