v4.19.13 snapshot.
diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
new file mode 100644
index 0000000..eb502c6
--- /dev/null
+++ b/net/iucv/iucv.c
@@ -0,0 +1,2107 @@
+/*
+ * IUCV base infrastructure.
+ *
+ * Copyright IBM Corp. 2001, 2009
+ *
+ * Author(s):
+ * Original source:
+ * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
+ * Xenia Tkatschow (xenia@us.ibm.com)
+ * 2Gb awareness and general cleanup:
+ * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
+ * Rewritten for af_iucv:
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * PM functions:
+ * Ursula Braun (ursula.braun@de.ibm.com)
+ *
+ * Documentation used:
+ * The original source
+ * CP Programming Service, IBM document # SC24-5760
+ *
+ * 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define KMSG_COMPONENT "iucv"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/spinlock.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/cpu.h>
+#include <linux/reboot.h>
+#include <net/iucv/iucv.h>
+#include <linux/atomic.h>
+#include <asm/ebcdic.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/smp.h>
+
+/*
+ * FLAGS:
+ * All flags are defined in the field IPFLAGS1 of each function
+ * and can be found in CP Programming Services.
+ * IPSRCCLS - Indicates you have specified a source class.
+ * IPTRGCLS - Indicates you have specified a target class.
+ * IPFGPID - Indicates you have specified a pathid.
+ * IPFGMID - Indicates you have specified a message ID.
+ * IPNORPY - Indicates a one-way message. No reply expected.
+ * IPALL - Indicates that all paths are affected.
+ */
+#define IUCV_IPSRCCLS 0x01
+#define IUCV_IPTRGCLS 0x01
+#define IUCV_IPFGPID 0x02
+#define IUCV_IPFGMID 0x04
+#define IUCV_IPNORPY 0x10
+#define IUCV_IPALL 0x80
+
+static int iucv_bus_match(struct device *dev, struct device_driver *drv)
+{
+ return 0;
+}
+
+enum iucv_pm_states {
+ IUCV_PM_INITIAL = 0,
+ IUCV_PM_FREEZING = 1,
+ IUCV_PM_THAWING = 2,
+ IUCV_PM_RESTORING = 3,
+};
+static enum iucv_pm_states iucv_pm_state;
+
+static int iucv_pm_prepare(struct device *);
+static void iucv_pm_complete(struct device *);
+static int iucv_pm_freeze(struct device *);
+static int iucv_pm_thaw(struct device *);
+static int iucv_pm_restore(struct device *);
+
+static const struct dev_pm_ops iucv_pm_ops = {
+ .prepare = iucv_pm_prepare,
+ .complete = iucv_pm_complete,
+ .freeze = iucv_pm_freeze,
+ .thaw = iucv_pm_thaw,
+ .restore = iucv_pm_restore,
+};
+
+struct bus_type iucv_bus = {
+ .name = "iucv",
+ .match = iucv_bus_match,
+ .pm = &iucv_pm_ops,
+};
+EXPORT_SYMBOL(iucv_bus);
+
+struct device *iucv_root;
+EXPORT_SYMBOL(iucv_root);
+
+static int iucv_available;
+
+/* General IUCV interrupt structure */
+struct iucv_irq_data {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u32 res2[8];
+};
+
+struct iucv_irq_list {
+ struct list_head list;
+ struct iucv_irq_data data;
+};
+
+static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
+static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE };
+static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE };
+
+/*
+ * Queue of interrupt buffers lock for delivery via the tasklet
+ * (fast but can't call smp_call_function).
+ */
+static LIST_HEAD(iucv_task_queue);
+
+/*
+ * The tasklet for fast delivery of iucv interrupts.
+ */
+static void iucv_tasklet_fn(unsigned long);
+static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
+
+/*
+ * Queue of interrupt buffers for delivery via a work queue
+ * (slower but can call smp_call_function).
+ */
+static LIST_HEAD(iucv_work_queue);
+
+/*
+ * The work element to deliver path pending interrupts.
+ */
+static void iucv_work_fn(struct work_struct *work);
+static DECLARE_WORK(iucv_work, iucv_work_fn);
+
+/*
+ * Spinlock protecting task and work queue.
+ */
+static DEFINE_SPINLOCK(iucv_queue_lock);
+
+enum iucv_command_codes {
+ IUCV_QUERY = 0,
+ IUCV_RETRIEVE_BUFFER = 2,
+ IUCV_SEND = 4,
+ IUCV_RECEIVE = 5,
+ IUCV_REPLY = 6,
+ IUCV_REJECT = 8,
+ IUCV_PURGE = 9,
+ IUCV_ACCEPT = 10,
+ IUCV_CONNECT = 11,
+ IUCV_DECLARE_BUFFER = 12,
+ IUCV_QUIESCE = 13,
+ IUCV_RESUME = 14,
+ IUCV_SEVER = 15,
+ IUCV_SETMASK = 16,
+ IUCV_SETCONTROLMASK = 17,
+};
+
+/*
+ * Error messages that are used with the iucv_sever function. They get
+ * converted to EBCDIC.
+ */
+static char iucv_error_no_listener[16] = "NO LISTENER";
+static char iucv_error_no_memory[16] = "NO MEMORY";
+static char iucv_error_pathid[16] = "INVALID PATHID";
+
+/*
+ * iucv_handler_list: List of registered handlers.
+ */
+static LIST_HEAD(iucv_handler_list);
+
+/*
+ * iucv_path_table: an array of iucv_path structures.
+ */
+static struct iucv_path **iucv_path_table;
+static unsigned long iucv_max_pathid;
+
+/*
+ * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
+ */
+static DEFINE_SPINLOCK(iucv_table_lock);
+
+/*
+ * iucv_active_cpu: contains the number of the cpu executing the tasklet
+ * or the work handler. Needed for iucv_path_sever called from tasklet.
+ */
+static int iucv_active_cpu = -1;
+
+/*
+ * Mutex and wait queue for iucv_register/iucv_unregister.
+ */
+static DEFINE_MUTEX(iucv_register_mutex);
+
+/*
+ * Counter for number of non-smp capable handlers.
+ */
+static int iucv_nonsmp_handler;
+
+/*
+ * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
+ * iucv_path_quiesce and iucv_path_sever.
+ */
+struct iucv_cmd_control {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u16 ipmsglim;
+ u16 res1;
+ u8 ipvmid[8];
+ u8 ipuser[16];
+ u8 iptarget[8];
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Data in parameter list iucv structure. Used by iucv_message_send,
+ * iucv_message_send2way and iucv_message_reply.
+ */
+struct iucv_cmd_dpl {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u32 ipmsgid;
+ u32 iptrgcls;
+ u8 iprmmsg[8];
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 ipbfadr2;
+ u32 ipbfln2f;
+ u32 res;
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Data in buffer iucv structure. Used by iucv_message_receive,
+ * iucv_message_reject, iucv_message_send, iucv_message_send2way
+ * and iucv_declare_cpu.
+ */
+struct iucv_cmd_db {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u32 ipmsgid;
+ u32 iptrgcls;
+ u32 ipbfadr1;
+ u32 ipbfln1f;
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 ipbfadr2;
+ u32 ipbfln2f;
+ u32 res;
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Purge message iucv structure. Used by iucv_message_purge.
+ */
+struct iucv_cmd_purge {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u32 ipmsgid;
+ u8 ipaudit[3];
+ u8 res1[5];
+ u32 res2;
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 res3[3];
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Set mask iucv structure. Used by iucv_enable_cpu.
+ */
+struct iucv_cmd_set_mask {
+ u8 ipmask;
+ u8 res1[2];
+ u8 iprcode;
+ u32 res2[9];
+} __attribute__ ((packed,aligned(8)));
+
+union iucv_param {
+ struct iucv_cmd_control ctrl;
+ struct iucv_cmd_dpl dpl;
+ struct iucv_cmd_db db;
+ struct iucv_cmd_purge purge;
+ struct iucv_cmd_set_mask set_mask;
+};
+
+/*
+ * Anchor for per-cpu IUCV command parameter block.
+ */
+static union iucv_param *iucv_param[NR_CPUS];
+static union iucv_param *iucv_param_irq[NR_CPUS];
+
+/**
+ * iucv_call_b2f0
+ * @code: identifier of IUCV call to CP.
+ * @parm: pointer to a struct iucv_parm block
+ *
+ * Calls CP to execute IUCV commands.
+ *
+ * Returns the result of the CP IUCV call.
+ */
+static inline int __iucv_call_b2f0(int command, union iucv_param *parm)
+{
+ register unsigned long reg0 asm ("0");
+ register unsigned long reg1 asm ("1");
+ int ccode;
+
+ reg0 = command;
+ reg1 = (unsigned long)parm;
+ asm volatile(
+ " .long 0xb2f01000\n"
+ " ipm %0\n"
+ " srl %0,28\n"
+ : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
+ : "m" (*parm) : "cc");
+ return ccode;
+}
+
+static inline int iucv_call_b2f0(int command, union iucv_param *parm)
+{
+ int ccode;
+
+ ccode = __iucv_call_b2f0(command, parm);
+ return ccode == 1 ? parm->ctrl.iprcode : ccode;
+}
+
+/**
+ * iucv_query_maxconn
+ *
+ * Determines the maximum number of connections that may be established.
+ *
+ * Returns the maximum number of connections or -EPERM is IUCV is not
+ * available.
+ */
+static int __iucv_query_maxconn(void *param, unsigned long *max_pathid)
+{
+ register unsigned long reg0 asm ("0");
+ register unsigned long reg1 asm ("1");
+ int ccode;
+
+ reg0 = IUCV_QUERY;
+ reg1 = (unsigned long) param;
+ asm volatile (
+ " .long 0xb2f01000\n"
+ " ipm %0\n"
+ " srl %0,28\n"
+ : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
+ *max_pathid = reg1;
+ return ccode;
+}
+
+static int iucv_query_maxconn(void)
+{
+ unsigned long max_pathid;
+ void *param;
+ int ccode;
+
+ param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA);
+ if (!param)
+ return -ENOMEM;
+ ccode = __iucv_query_maxconn(param, &max_pathid);
+ if (ccode == 0)
+ iucv_max_pathid = max_pathid;
+ kfree(param);
+ return ccode ? -EPERM : 0;
+}
+
+/**
+ * iucv_allow_cpu
+ * @data: unused
+ *
+ * Allow iucv interrupts on this cpu.
+ */
+static void iucv_allow_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+
+ /*
+ * Enable all iucv interrupts.
+ * ipmask contains bits for the different interrupts
+ * 0x80 - Flag to allow nonpriority message pending interrupts
+ * 0x40 - Flag to allow priority message pending interrupts
+ * 0x20 - Flag to allow nonpriority message completion interrupts
+ * 0x10 - Flag to allow priority message completion interrupts
+ * 0x08 - Flag to allow IUCV control interrupts
+ */
+ parm = iucv_param_irq[cpu];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->set_mask.ipmask = 0xf8;
+ iucv_call_b2f0(IUCV_SETMASK, parm);
+
+ /*
+ * Enable all iucv control interrupts.
+ * ipmask contains bits for the different interrupts
+ * 0x80 - Flag to allow pending connections interrupts
+ * 0x40 - Flag to allow connection complete interrupts
+ * 0x20 - Flag to allow connection severed interrupts
+ * 0x10 - Flag to allow connection quiesced interrupts
+ * 0x08 - Flag to allow connection resumed interrupts
+ */
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->set_mask.ipmask = 0xf8;
+ iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
+ /* Set indication that iucv interrupts are allowed for this cpu. */
+ cpumask_set_cpu(cpu, &iucv_irq_cpumask);
+}
+
+/**
+ * iucv_block_cpu
+ * @data: unused
+ *
+ * Block iucv interrupts on this cpu.
+ */
+static void iucv_block_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+
+ /* Disable all iucv interrupts. */
+ parm = iucv_param_irq[cpu];
+ memset(parm, 0, sizeof(union iucv_param));
+ iucv_call_b2f0(IUCV_SETMASK, parm);
+
+ /* Clear indication that iucv interrupts are allowed for this cpu. */
+ cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
+}
+
+/**
+ * iucv_block_cpu_almost
+ * @data: unused
+ *
+ * Allow connection-severed interrupts only on this cpu.
+ */
+static void iucv_block_cpu_almost(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+
+ /* Allow iucv control interrupts only */
+ parm = iucv_param_irq[cpu];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->set_mask.ipmask = 0x08;
+ iucv_call_b2f0(IUCV_SETMASK, parm);
+ /* Allow iucv-severed interrupt only */
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->set_mask.ipmask = 0x20;
+ iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
+
+ /* Clear indication that iucv interrupts are allowed for this cpu. */
+ cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
+}
+
+/**
+ * iucv_declare_cpu
+ * @data: unused
+ *
+ * Declare a interrupt buffer on this cpu.
+ */
+static void iucv_declare_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+ int rc;
+
+ if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
+ return;
+
+ /* Declare interrupt buffer. */
+ parm = iucv_param_irq[cpu];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
+ rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
+ if (rc) {
+ char *err = "Unknown";
+ switch (rc) {
+ case 0x03:
+ err = "Directory error";
+ break;
+ case 0x0a:
+ err = "Invalid length";
+ break;
+ case 0x13:
+ err = "Buffer already exists";
+ break;
+ case 0x3e:
+ err = "Buffer overlap";
+ break;
+ case 0x5c:
+ err = "Paging or storage error";
+ break;
+ }
+ pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n",
+ cpu, rc, err);
+ return;
+ }
+
+ /* Set indication that an iucv buffer exists for this cpu. */
+ cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
+
+ if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
+ /* Enable iucv interrupts on this cpu. */
+ iucv_allow_cpu(NULL);
+ else
+ /* Disable iucv interrupts on this cpu. */
+ iucv_block_cpu(NULL);
+}
+
+/**
+ * iucv_retrieve_cpu
+ * @data: unused
+ *
+ * Retrieve interrupt buffer on this cpu.
+ */
+static void iucv_retrieve_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+
+ if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
+ return;
+
+ /* Block iucv interrupts. */
+ iucv_block_cpu(NULL);
+
+ /* Retrieve interrupt buffer. */
+ parm = iucv_param_irq[cpu];
+ iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
+
+ /* Clear indication that an iucv buffer exists for this cpu. */
+ cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
+}
+
+/**
+ * iucv_setmask_smp
+ *
+ * Allow iucv interrupts on all cpus.
+ */
+static void iucv_setmask_mp(void)
+{
+ int cpu;
+
+ get_online_cpus();
+ for_each_online_cpu(cpu)
+ /* Enable all cpus with a declared buffer. */
+ if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
+ !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
+ smp_call_function_single(cpu, iucv_allow_cpu,
+ NULL, 1);
+ put_online_cpus();
+}
+
+/**
+ * iucv_setmask_up
+ *
+ * Allow iucv interrupts on a single cpu.
+ */
+static void iucv_setmask_up(void)
+{
+ cpumask_t cpumask;
+ int cpu;
+
+ /* Disable all cpu but the first in cpu_irq_cpumask. */
+ cpumask_copy(&cpumask, &iucv_irq_cpumask);
+ cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
+ for_each_cpu(cpu, &cpumask)
+ smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
+}
+
+/**
+ * iucv_enable
+ *
+ * This function makes iucv ready for use. It allocates the pathid
+ * table, declares an iucv interrupt buffer and enables the iucv
+ * interrupts. Called when the first user has registered an iucv
+ * handler.
+ */
+static int iucv_enable(void)
+{
+ size_t alloc_size;
+ int cpu, rc;
+
+ get_online_cpus();
+ rc = -ENOMEM;
+ alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
+ iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
+ if (!iucv_path_table)
+ goto out;
+ /* Declare per cpu buffers. */
+ rc = -EIO;
+ for_each_online_cpu(cpu)
+ smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
+ if (cpumask_empty(&iucv_buffer_cpumask))
+ /* No cpu could declare an iucv buffer. */
+ goto out;
+ put_online_cpus();
+ return 0;
+out:
+ kfree(iucv_path_table);
+ iucv_path_table = NULL;
+ put_online_cpus();
+ return rc;
+}
+
+/**
+ * iucv_disable
+ *
+ * This function shuts down iucv. It disables iucv interrupts, retrieves
+ * the iucv interrupt buffer and frees the pathid table. Called after the
+ * last user unregister its iucv handler.
+ */
+static void iucv_disable(void)
+{
+ get_online_cpus();
+ on_each_cpu(iucv_retrieve_cpu, NULL, 1);
+ kfree(iucv_path_table);
+ iucv_path_table = NULL;
+ put_online_cpus();
+}
+
+static int iucv_cpu_dead(unsigned int cpu)
+{
+ kfree(iucv_param_irq[cpu]);
+ iucv_param_irq[cpu] = NULL;
+ kfree(iucv_param[cpu]);
+ iucv_param[cpu] = NULL;
+ kfree(iucv_irq_data[cpu]);
+ iucv_irq_data[cpu] = NULL;
+ return 0;
+}
+
+static int iucv_cpu_prepare(unsigned int cpu)
+{
+ /* Note: GFP_DMA used to get memory below 2G */
+ iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
+ GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+ if (!iucv_irq_data[cpu])
+ goto out_free;
+
+ /* Allocate parameter blocks. */
+ iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
+ GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+ if (!iucv_param[cpu])
+ goto out_free;
+
+ iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
+ GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+ if (!iucv_param_irq[cpu])
+ goto out_free;
+
+ return 0;
+
+out_free:
+ iucv_cpu_dead(cpu);
+ return -ENOMEM;
+}
+
+static int iucv_cpu_online(unsigned int cpu)
+{
+ if (!iucv_path_table)
+ return 0;
+ iucv_declare_cpu(NULL);
+ return 0;
+}
+
+static int iucv_cpu_down_prep(unsigned int cpu)
+{
+ cpumask_t cpumask;
+
+ if (!iucv_path_table)
+ return 0;
+
+ cpumask_copy(&cpumask, &iucv_buffer_cpumask);
+ cpumask_clear_cpu(cpu, &cpumask);
+ if (cpumask_empty(&cpumask))
+ /* Can't offline last IUCV enabled cpu. */
+ return -EINVAL;
+
+ iucv_retrieve_cpu(NULL);
+ if (!cpumask_empty(&iucv_irq_cpumask))
+ return 0;
+ smp_call_function_single(cpumask_first(&iucv_buffer_cpumask),
+ iucv_allow_cpu, NULL, 1);
+ return 0;
+}
+
+/**
+ * iucv_sever_pathid
+ * @pathid: path identification number.
+ * @userdata: 16-bytes of user data.
+ *
+ * Sever an iucv path to free up the pathid. Used internally.
+ */
+static int iucv_sever_pathid(u16 pathid, u8 *userdata)
+{
+ union iucv_param *parm;
+
+ parm = iucv_param_irq[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ippathid = pathid;
+ return iucv_call_b2f0(IUCV_SEVER, parm);
+}
+
+/**
+ * __iucv_cleanup_queue
+ * @dummy: unused dummy argument
+ *
+ * Nop function called via smp_call_function to force work items from
+ * pending external iucv interrupts to the work queue.
+ */
+static void __iucv_cleanup_queue(void *dummy)
+{
+}
+
+/**
+ * iucv_cleanup_queue
+ *
+ * Function called after a path has been severed to find all remaining
+ * work items for the now stale pathid. The caller needs to hold the
+ * iucv_table_lock.
+ */
+static void iucv_cleanup_queue(void)
+{
+ struct iucv_irq_list *p, *n;
+
+ /*
+ * When a path is severed, the pathid can be reused immediately
+ * on a iucv connect or a connection pending interrupt. Remove
+ * all entries from the task queue that refer to a stale pathid
+ * (iucv_path_table[ix] == NULL). Only then do the iucv connect
+ * or deliver the connection pending interrupt. To get all the
+ * pending interrupts force them to the work queue by calling
+ * an empty function on all cpus.
+ */
+ smp_call_function(__iucv_cleanup_queue, NULL, 1);
+ spin_lock_irq(&iucv_queue_lock);
+ list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
+ /* Remove stale work items from the task queue. */
+ if (iucv_path_table[p->data.ippathid] == NULL) {
+ list_del(&p->list);
+ kfree(p);
+ }
+ }
+ spin_unlock_irq(&iucv_queue_lock);
+}
+
+/**
+ * iucv_register:
+ * @handler: address of iucv handler structure
+ * @smp: != 0 indicates that the handler can deal with out of order messages
+ *
+ * Registers a driver with IUCV.
+ *
+ * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
+ * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
+ */
+int iucv_register(struct iucv_handler *handler, int smp)
+{
+ int rc;
+
+ if (!iucv_available)
+ return -ENOSYS;
+ mutex_lock(&iucv_register_mutex);
+ if (!smp)
+ iucv_nonsmp_handler++;
+ if (list_empty(&iucv_handler_list)) {
+ rc = iucv_enable();
+ if (rc)
+ goto out_mutex;
+ } else if (!smp && iucv_nonsmp_handler == 1)
+ iucv_setmask_up();
+ INIT_LIST_HEAD(&handler->paths);
+
+ spin_lock_bh(&iucv_table_lock);
+ list_add_tail(&handler->list, &iucv_handler_list);
+ spin_unlock_bh(&iucv_table_lock);
+ rc = 0;
+out_mutex:
+ mutex_unlock(&iucv_register_mutex);
+ return rc;
+}
+EXPORT_SYMBOL(iucv_register);
+
+/**
+ * iucv_unregister
+ * @handler: address of iucv handler structure
+ * @smp: != 0 indicates that the handler can deal with out of order messages
+ *
+ * Unregister driver from IUCV.
+ */
+void iucv_unregister(struct iucv_handler *handler, int smp)
+{
+ struct iucv_path *p, *n;
+
+ mutex_lock(&iucv_register_mutex);
+ spin_lock_bh(&iucv_table_lock);
+ /* Remove handler from the iucv_handler_list. */
+ list_del_init(&handler->list);
+ /* Sever all pathids still referring to the handler. */
+ list_for_each_entry_safe(p, n, &handler->paths, list) {
+ iucv_sever_pathid(p->pathid, NULL);
+ iucv_path_table[p->pathid] = NULL;
+ list_del(&p->list);
+ iucv_path_free(p);
+ }
+ spin_unlock_bh(&iucv_table_lock);
+ if (!smp)
+ iucv_nonsmp_handler--;
+ if (list_empty(&iucv_handler_list))
+ iucv_disable();
+ else if (!smp && iucv_nonsmp_handler == 0)
+ iucv_setmask_mp();
+ mutex_unlock(&iucv_register_mutex);
+}
+EXPORT_SYMBOL(iucv_unregister);
+
+static int iucv_reboot_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ int i;
+
+ if (cpumask_empty(&iucv_irq_cpumask))
+ return NOTIFY_DONE;
+
+ get_online_cpus();
+ on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
+ preempt_disable();
+ for (i = 0; i < iucv_max_pathid; i++) {
+ if (iucv_path_table[i])
+ iucv_sever_pathid(i, NULL);
+ }
+ preempt_enable();
+ put_online_cpus();
+ iucv_disable();
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block iucv_reboot_notifier = {
+ .notifier_call = iucv_reboot_event,
+};
+
+/**
+ * iucv_path_accept
+ * @path: address of iucv path structure
+ * @handler: address of iucv handler structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ * @private: private data passed to interrupt handlers for this path
+ *
+ * This function is issued after the user received a connection pending
+ * external interrupt and now wishes to complete the IUCV communication path.
+ *
+ * Returns the result of the CP IUCV call.
+ */
+int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
+ u8 *userdata, void *private)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ /* Prepare parameter block. */
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->ctrl.ippathid = path->pathid;
+ parm->ctrl.ipmsglim = path->msglim;
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ipflags1 = path->flags;
+
+ rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
+ if (!rc) {
+ path->private = private;
+ path->msglim = parm->ctrl.ipmsglim;
+ path->flags = parm->ctrl.ipflags1;
+ }
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_path_accept);
+
+/**
+ * iucv_path_connect
+ * @path: address of iucv path structure
+ * @handler: address of iucv handler structure
+ * @userid: 8-byte user identification
+ * @system: 8-byte target system identification
+ * @userdata: 16 bytes of data reflected to the communication partner
+ * @private: private data passed to interrupt handlers for this path
+ *
+ * This function establishes an IUCV path. Although the connect may complete
+ * successfully, you are not able to use the path until you receive an IUCV
+ * Connection Complete external interrupt.
+ *
+ * Returns the result of the CP IUCV call.
+ */
+int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
+ u8 *userid, u8 *system, u8 *userdata,
+ void *private)
+{
+ union iucv_param *parm;
+ int rc;
+
+ spin_lock_bh(&iucv_table_lock);
+ iucv_cleanup_queue();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->ctrl.ipmsglim = path->msglim;
+ parm->ctrl.ipflags1 = path->flags;
+ if (userid) {
+ memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
+ ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
+ EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
+ }
+ if (system) {
+ memcpy(parm->ctrl.iptarget, system,
+ sizeof(parm->ctrl.iptarget));
+ ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
+ EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
+ }
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+
+ rc = iucv_call_b2f0(IUCV_CONNECT, parm);
+ if (!rc) {
+ if (parm->ctrl.ippathid < iucv_max_pathid) {
+ path->pathid = parm->ctrl.ippathid;
+ path->msglim = parm->ctrl.ipmsglim;
+ path->flags = parm->ctrl.ipflags1;
+ path->handler = handler;
+ path->private = private;
+ list_add_tail(&path->list, &handler->paths);
+ iucv_path_table[path->pathid] = path;
+ } else {
+ iucv_sever_pathid(parm->ctrl.ippathid,
+ iucv_error_pathid);
+ rc = -EIO;
+ }
+ }
+out:
+ spin_unlock_bh(&iucv_table_lock);
+ return rc;
+}
+EXPORT_SYMBOL(iucv_path_connect);
+
+/**
+ * iucv_path_quiesce:
+ * @path: address of iucv path structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ *
+ * This function temporarily suspends incoming messages on an IUCV path.
+ * You can later reactivate the path by invoking the iucv_resume function.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_path_quiesce(struct iucv_path *path, u8 *userdata)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ippathid = path->pathid;
+ rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_path_quiesce);
+
+/**
+ * iucv_path_resume:
+ * @path: address of iucv path structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ *
+ * This function resumes incoming messages on an IUCV path that has
+ * been stopped with iucv_path_quiesce.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_path_resume(struct iucv_path *path, u8 *userdata)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ippathid = path->pathid;
+ rc = iucv_call_b2f0(IUCV_RESUME, parm);
+out:
+ local_bh_enable();
+ return rc;
+}
+
+/**
+ * iucv_path_sever
+ * @path: address of iucv path structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ *
+ * This function terminates an IUCV path.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_path_sever(struct iucv_path *path, u8 *userdata)
+{
+ int rc;
+
+ preempt_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ if (iucv_active_cpu != smp_processor_id())
+ spin_lock_bh(&iucv_table_lock);
+ rc = iucv_sever_pathid(path->pathid, userdata);
+ iucv_path_table[path->pathid] = NULL;
+ list_del_init(&path->list);
+ if (iucv_active_cpu != smp_processor_id())
+ spin_unlock_bh(&iucv_table_lock);
+out:
+ preempt_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_path_sever);
+
+/**
+ * iucv_message_purge
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @srccls: source class of message
+ *
+ * Cancels a message you have sent.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
+ u32 srccls)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->purge.ippathid = path->pathid;
+ parm->purge.ipmsgid = msg->id;
+ parm->purge.ipsrccls = srccls;
+ parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
+ rc = iucv_call_b2f0(IUCV_PURGE, parm);
+ if (!rc) {
+ msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
+ msg->tag = parm->purge.ipmsgtag;
+ }
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_purge);
+
+/**
+ * iucv_message_receive_iprmdata
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is received (IUCV_IPBUFLST)
+ * @buffer: address of data buffer or address of struct iucv_array
+ * @size: length of data buffer
+ * @residual:
+ *
+ * Internal function used by iucv_message_receive and __iucv_message_receive
+ * to receive RMDATA data stored in struct iucv_message.
+ */
+static int iucv_message_receive_iprmdata(struct iucv_path *path,
+ struct iucv_message *msg,
+ u8 flags, void *buffer,
+ size_t size, size_t *residual)
+{
+ struct iucv_array *array;
+ u8 *rmmsg;
+ size_t copy;
+
+ /*
+ * Message is 8 bytes long and has been stored to the
+ * message descriptor itself.
+ */
+ if (residual)
+ *residual = abs(size - 8);
+ rmmsg = msg->rmmsg;
+ if (flags & IUCV_IPBUFLST) {
+ /* Copy to struct iucv_array. */
+ size = (size < 8) ? size : 8;
+ for (array = buffer; size > 0; array++) {
+ copy = min_t(size_t, size, array->length);
+ memcpy((u8 *)(addr_t) array->address,
+ rmmsg, copy);
+ rmmsg += copy;
+ size -= copy;
+ }
+ } else {
+ /* Copy to direct buffer. */
+ memcpy(buffer, rmmsg, min_t(size_t, size, 8));
+ }
+ return 0;
+}
+
+/**
+ * __iucv_message_receive
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is received (IUCV_IPBUFLST)
+ * @buffer: address of data buffer or address of struct iucv_array
+ * @size: length of data buffer
+ * @residual:
+ *
+ * This function receives messages that are being sent to you over
+ * established paths. This function will deal with RMDATA messages
+ * embedded in struct iucv_message as well.
+ *
+ * Locking: no locking
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, void *buffer, size_t size, size_t *residual)
+{
+ union iucv_param *parm;
+ int rc;
+
+ if (msg->flags & IUCV_IPRMDATA)
+ return iucv_message_receive_iprmdata(path, msg, flags,
+ buffer, size, residual);
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->db.ipbfadr1 = (u32)(addr_t) buffer;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ipmsgid = msg->id;
+ parm->db.ippathid = path->pathid;
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipflags1 = (flags | IUCV_IPFGPID |
+ IUCV_IPFGMID | IUCV_IPTRGCLS);
+ rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
+ if (!rc || rc == 5) {
+ msg->flags = parm->db.ipflags1;
+ if (residual)
+ *residual = parm->db.ipbfln1f;
+ }
+out:
+ return rc;
+}
+EXPORT_SYMBOL(__iucv_message_receive);
+
+/**
+ * iucv_message_receive
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is received (IUCV_IPBUFLST)
+ * @buffer: address of data buffer or address of struct iucv_array
+ * @size: length of data buffer
+ * @residual:
+ *
+ * This function receives messages that are being sent to you over
+ * established paths. This function will deal with RMDATA messages
+ * embedded in struct iucv_message as well.
+ *
+ * Locking: local_bh_enable/local_bh_disable
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, void *buffer, size_t size, size_t *residual)
+{
+ int rc;
+
+ if (msg->flags & IUCV_IPRMDATA)
+ return iucv_message_receive_iprmdata(path, msg, flags,
+ buffer, size, residual);
+ local_bh_disable();
+ rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_receive);
+
+/**
+ * iucv_message_reject
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ *
+ * The reject function refuses a specified message. Between the time you
+ * are notified of a message and the time that you complete the message,
+ * the message may be rejected.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->db.ippathid = path->pathid;
+ parm->db.ipmsgid = msg->id;
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
+ rc = iucv_call_b2f0(IUCV_REJECT, parm);
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_reject);
+
+/**
+ * iucv_message_reply
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
+ * @reply: address of reply data buffer or address of struct iucv_array
+ * @size: length of reply data buffer
+ *
+ * This function responds to the two-way messages that you receive. You
+ * must identify completely the message to which you wish to reply. ie,
+ * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
+ * the parameter list.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, void *reply, size_t size)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (flags & IUCV_IPRMDATA) {
+ parm->dpl.ippathid = path->pathid;
+ parm->dpl.ipflags1 = flags;
+ parm->dpl.ipmsgid = msg->id;
+ parm->dpl.iptrgcls = msg->class;
+ memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
+ } else {
+ parm->db.ipbfadr1 = (u32)(addr_t) reply;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ippathid = path->pathid;
+ parm->db.ipflags1 = flags;
+ parm->db.ipmsgid = msg->id;
+ parm->db.iptrgcls = msg->class;
+ }
+ rc = iucv_call_b2f0(IUCV_REPLY, parm);
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_reply);
+
+/**
+ * __iucv_message_send
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
+ * @srccls: source class of message
+ * @buffer: address of send buffer or address of struct iucv_array
+ * @size: length of send buffer
+ *
+ * This function transmits data to another application. Data to be
+ * transmitted is in a buffer and this is a one-way message and the
+ * receiver will not reply to the message.
+ *
+ * Locking: no locking
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, u32 srccls, void *buffer, size_t size)
+{
+ union iucv_param *parm;
+ int rc;
+
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (flags & IUCV_IPRMDATA) {
+ /* Message of 8 bytes can be placed into the parameter list. */
+ parm->dpl.ippathid = path->pathid;
+ parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
+ parm->dpl.iptrgcls = msg->class;
+ parm->dpl.ipsrccls = srccls;
+ parm->dpl.ipmsgtag = msg->tag;
+ memcpy(parm->dpl.iprmmsg, buffer, 8);
+ } else {
+ parm->db.ipbfadr1 = (u32)(addr_t) buffer;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ippathid = path->pathid;
+ parm->db.ipflags1 = flags | IUCV_IPNORPY;
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipsrccls = srccls;
+ parm->db.ipmsgtag = msg->tag;
+ }
+ rc = iucv_call_b2f0(IUCV_SEND, parm);
+ if (!rc)
+ msg->id = parm->db.ipmsgid;
+out:
+ return rc;
+}
+EXPORT_SYMBOL(__iucv_message_send);
+
+/**
+ * iucv_message_send
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
+ * @srccls: source class of message
+ * @buffer: address of send buffer or address of struct iucv_array
+ * @size: length of send buffer
+ *
+ * This function transmits data to another application. Data to be
+ * transmitted is in a buffer and this is a one-way message and the
+ * receiver will not reply to the message.
+ *
+ * Locking: local_bh_enable/local_bh_disable
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, u32 srccls, void *buffer, size_t size)
+{
+ int rc;
+
+ local_bh_disable();
+ rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_send);
+
+/**
+ * iucv_message_send2way
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is sent and the reply is received
+ * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
+ * @srccls: source class of message
+ * @buffer: address of send buffer or address of struct iucv_array
+ * @size: length of send buffer
+ * @ansbuf: address of answer buffer or address of struct iucv_array
+ * @asize: size of reply buffer
+ *
+ * This function transmits data to another application. Data to be
+ * transmitted is in a buffer. The receiver of the send is expected to
+ * reply to the message and a buffer is provided into which IUCV moves
+ * the reply to this message.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, u32 srccls, void *buffer, size_t size,
+ void *answer, size_t asize, size_t *residual)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (flags & IUCV_IPRMDATA) {
+ parm->dpl.ippathid = path->pathid;
+ parm->dpl.ipflags1 = path->flags; /* priority message */
+ parm->dpl.iptrgcls = msg->class;
+ parm->dpl.ipsrccls = srccls;
+ parm->dpl.ipmsgtag = msg->tag;
+ parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
+ parm->dpl.ipbfln2f = (u32) asize;
+ memcpy(parm->dpl.iprmmsg, buffer, 8);
+ } else {
+ parm->db.ippathid = path->pathid;
+ parm->db.ipflags1 = path->flags; /* priority message */
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipsrccls = srccls;
+ parm->db.ipmsgtag = msg->tag;
+ parm->db.ipbfadr1 = (u32)(addr_t) buffer;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ipbfadr2 = (u32)(addr_t) answer;
+ parm->db.ipbfln2f = (u32) asize;
+ }
+ rc = iucv_call_b2f0(IUCV_SEND, parm);
+ if (!rc)
+ msg->id = parm->db.ipmsgid;
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_send2way);
+
+/**
+ * iucv_path_pending
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection pending work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_pending {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u16 ipmsglim;
+ u16 res1;
+ u8 ipvmid[8];
+ u8 ipuser[16];
+ u32 res3;
+ u8 ippollfg;
+ u8 res4[3];
+} __packed;
+
+static void iucv_path_pending(struct iucv_irq_data *data)
+{
+ struct iucv_path_pending *ipp = (void *) data;
+ struct iucv_handler *handler;
+ struct iucv_path *path;
+ char *error;
+
+ BUG_ON(iucv_path_table[ipp->ippathid]);
+ /* New pathid, handler found. Create a new path struct. */
+ error = iucv_error_no_memory;
+ path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
+ if (!path)
+ goto out_sever;
+ path->pathid = ipp->ippathid;
+ iucv_path_table[path->pathid] = path;
+ EBCASC(ipp->ipvmid, 8);
+
+ /* Call registered handler until one is found that wants the path. */
+ list_for_each_entry(handler, &iucv_handler_list, list) {
+ if (!handler->path_pending)
+ continue;
+ /*
+ * Add path to handler to allow a call to iucv_path_sever
+ * inside the path_pending function. If the handler returns
+ * an error remove the path from the handler again.
+ */
+ list_add(&path->list, &handler->paths);
+ path->handler = handler;
+ if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
+ return;
+ list_del(&path->list);
+ path->handler = NULL;
+ }
+ /* No handler wanted the path. */
+ iucv_path_table[path->pathid] = NULL;
+ iucv_path_free(path);
+ error = iucv_error_no_listener;
+out_sever:
+ iucv_sever_pathid(ipp->ippathid, error);
+}
+
+/**
+ * iucv_path_complete
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection complete work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_complete {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u16 ipmsglim;
+ u16 res1;
+ u8 res2[8];
+ u8 ipuser[16];
+ u32 res3;
+ u8 ippollfg;
+ u8 res4[3];
+} __packed;
+
+static void iucv_path_complete(struct iucv_irq_data *data)
+{
+ struct iucv_path_complete *ipc = (void *) data;
+ struct iucv_path *path = iucv_path_table[ipc->ippathid];
+
+ if (path)
+ path->flags = ipc->ipflags1;
+ if (path && path->handler && path->handler->path_complete)
+ path->handler->path_complete(path, ipc->ipuser);
+}
+
+/**
+ * iucv_path_severed
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection severed work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_severed {
+ u16 ippathid;
+ u8 res1;
+ u8 iptype;
+ u32 res2;
+ u8 res3[8];
+ u8 ipuser[16];
+ u32 res4;
+ u8 ippollfg;
+ u8 res5[3];
+} __packed;
+
+static void iucv_path_severed(struct iucv_irq_data *data)
+{
+ struct iucv_path_severed *ips = (void *) data;
+ struct iucv_path *path = iucv_path_table[ips->ippathid];
+
+ if (!path || !path->handler) /* Already severed */
+ return;
+ if (path->handler->path_severed)
+ path->handler->path_severed(path, ips->ipuser);
+ else {
+ iucv_sever_pathid(path->pathid, NULL);
+ iucv_path_table[path->pathid] = NULL;
+ list_del(&path->list);
+ iucv_path_free(path);
+ }
+}
+
+/**
+ * iucv_path_quiesced
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection quiesced work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_quiesced {
+ u16 ippathid;
+ u8 res1;
+ u8 iptype;
+ u32 res2;
+ u8 res3[8];
+ u8 ipuser[16];
+ u32 res4;
+ u8 ippollfg;
+ u8 res5[3];
+} __packed;
+
+static void iucv_path_quiesced(struct iucv_irq_data *data)
+{
+ struct iucv_path_quiesced *ipq = (void *) data;
+ struct iucv_path *path = iucv_path_table[ipq->ippathid];
+
+ if (path && path->handler && path->handler->path_quiesced)
+ path->handler->path_quiesced(path, ipq->ipuser);
+}
+
+/**
+ * iucv_path_resumed
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection resumed work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_resumed {
+ u16 ippathid;
+ u8 res1;
+ u8 iptype;
+ u32 res2;
+ u8 res3[8];
+ u8 ipuser[16];
+ u32 res4;
+ u8 ippollfg;
+ u8 res5[3];
+} __packed;
+
+static void iucv_path_resumed(struct iucv_irq_data *data)
+{
+ struct iucv_path_resumed *ipr = (void *) data;
+ struct iucv_path *path = iucv_path_table[ipr->ippathid];
+
+ if (path && path->handler && path->handler->path_resumed)
+ path->handler->path_resumed(path, ipr->ipuser);
+}
+
+/**
+ * iucv_message_complete
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process message complete work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_message_complete {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u32 ipmsgid;
+ u32 ipaudit;
+ u8 iprmmsg[8];
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 res;
+ u32 ipbfln2f;
+ u8 ippollfg;
+ u8 res2[3];
+} __packed;
+
+static void iucv_message_complete(struct iucv_irq_data *data)
+{
+ struct iucv_message_complete *imc = (void *) data;
+ struct iucv_path *path = iucv_path_table[imc->ippathid];
+ struct iucv_message msg;
+
+ if (path && path->handler && path->handler->message_complete) {
+ msg.flags = imc->ipflags1;
+ msg.id = imc->ipmsgid;
+ msg.audit = imc->ipaudit;
+ memcpy(msg.rmmsg, imc->iprmmsg, 8);
+ msg.class = imc->ipsrccls;
+ msg.tag = imc->ipmsgtag;
+ msg.length = imc->ipbfln2f;
+ path->handler->message_complete(path, &msg);
+ }
+}
+
+/**
+ * iucv_message_pending
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process message pending work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_message_pending {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u32 ipmsgid;
+ u32 iptrgcls;
+ union {
+ u32 iprmmsg1_u32;
+ u8 iprmmsg1[4];
+ } ln1msg1;
+ union {
+ u32 ipbfln1f;
+ u8 iprmmsg2[4];
+ } ln1msg2;
+ u32 res1[3];
+ u32 ipbfln2f;
+ u8 ippollfg;
+ u8 res2[3];
+} __packed;
+
+static void iucv_message_pending(struct iucv_irq_data *data)
+{
+ struct iucv_message_pending *imp = (void *) data;
+ struct iucv_path *path = iucv_path_table[imp->ippathid];
+ struct iucv_message msg;
+
+ if (path && path->handler && path->handler->message_pending) {
+ msg.flags = imp->ipflags1;
+ msg.id = imp->ipmsgid;
+ msg.class = imp->iptrgcls;
+ if (imp->ipflags1 & IUCV_IPRMDATA) {
+ memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
+ msg.length = 8;
+ } else
+ msg.length = imp->ln1msg2.ipbfln1f;
+ msg.reply_size = imp->ipbfln2f;
+ path->handler->message_pending(path, &msg);
+ }
+}
+
+/**
+ * iucv_tasklet_fn:
+ *
+ * This tasklet loops over the queue of irq buffers created by
+ * iucv_external_interrupt, calls the appropriate action handler
+ * and then frees the buffer.
+ */
+static void iucv_tasklet_fn(unsigned long ignored)
+{
+ typedef void iucv_irq_fn(struct iucv_irq_data *);
+ static iucv_irq_fn *irq_fn[] = {
+ [0x02] = iucv_path_complete,
+ [0x03] = iucv_path_severed,
+ [0x04] = iucv_path_quiesced,
+ [0x05] = iucv_path_resumed,
+ [0x06] = iucv_message_complete,
+ [0x07] = iucv_message_complete,
+ [0x08] = iucv_message_pending,
+ [0x09] = iucv_message_pending,
+ };
+ LIST_HEAD(task_queue);
+ struct iucv_irq_list *p, *n;
+
+ /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
+ if (!spin_trylock(&iucv_table_lock)) {
+ tasklet_schedule(&iucv_tasklet);
+ return;
+ }
+ iucv_active_cpu = smp_processor_id();
+
+ spin_lock_irq(&iucv_queue_lock);
+ list_splice_init(&iucv_task_queue, &task_queue);
+ spin_unlock_irq(&iucv_queue_lock);
+
+ list_for_each_entry_safe(p, n, &task_queue, list) {
+ list_del_init(&p->list);
+ irq_fn[p->data.iptype](&p->data);
+ kfree(p);
+ }
+
+ iucv_active_cpu = -1;
+ spin_unlock(&iucv_table_lock);
+}
+
+/**
+ * iucv_work_fn:
+ *
+ * This work function loops over the queue of path pending irq blocks
+ * created by iucv_external_interrupt, calls the appropriate action
+ * handler and then frees the buffer.
+ */
+static void iucv_work_fn(struct work_struct *work)
+{
+ LIST_HEAD(work_queue);
+ struct iucv_irq_list *p, *n;
+
+ /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
+ spin_lock_bh(&iucv_table_lock);
+ iucv_active_cpu = smp_processor_id();
+
+ spin_lock_irq(&iucv_queue_lock);
+ list_splice_init(&iucv_work_queue, &work_queue);
+ spin_unlock_irq(&iucv_queue_lock);
+
+ iucv_cleanup_queue();
+ list_for_each_entry_safe(p, n, &work_queue, list) {
+ list_del_init(&p->list);
+ iucv_path_pending(&p->data);
+ kfree(p);
+ }
+
+ iucv_active_cpu = -1;
+ spin_unlock_bh(&iucv_table_lock);
+}
+
+/**
+ * iucv_external_interrupt
+ * @code: irq code
+ *
+ * Handles external interrupts coming in from CP.
+ * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
+ */
+static void iucv_external_interrupt(struct ext_code ext_code,
+ unsigned int param32, unsigned long param64)
+{
+ struct iucv_irq_data *p;
+ struct iucv_irq_list *work;
+
+ inc_irq_stat(IRQEXT_IUC);
+ p = iucv_irq_data[smp_processor_id()];
+ if (p->ippathid >= iucv_max_pathid) {
+ WARN_ON(p->ippathid >= iucv_max_pathid);
+ iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
+ return;
+ }
+ BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
+ work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
+ if (!work) {
+ pr_warn("iucv_external_interrupt: out of memory\n");
+ return;
+ }
+ memcpy(&work->data, p, sizeof(work->data));
+ spin_lock(&iucv_queue_lock);
+ if (p->iptype == 0x01) {
+ /* Path pending interrupt. */
+ list_add_tail(&work->list, &iucv_work_queue);
+ schedule_work(&iucv_work);
+ } else {
+ /* The other interrupts. */
+ list_add_tail(&work->list, &iucv_task_queue);
+ tasklet_schedule(&iucv_tasklet);
+ }
+ spin_unlock(&iucv_queue_lock);
+}
+
+static int iucv_pm_prepare(struct device *dev)
+{
+ int rc = 0;
+
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_INFO "iucv_pm_prepare\n");
+#endif
+ if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
+ rc = dev->driver->pm->prepare(dev);
+ return rc;
+}
+
+static void iucv_pm_complete(struct device *dev)
+{
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_INFO "iucv_pm_complete\n");
+#endif
+ if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
+ dev->driver->pm->complete(dev);
+}
+
+/**
+ * iucv_path_table_empty() - determine if iucv path table is empty
+ *
+ * Returns 0 if there are still iucv pathes defined
+ * 1 if there are no iucv pathes defined
+ */
+static int iucv_path_table_empty(void)
+{
+ int i;
+
+ for (i = 0; i < iucv_max_pathid; i++) {
+ if (iucv_path_table[i])
+ return 0;
+ }
+ return 1;
+}
+
+/**
+ * iucv_pm_freeze() - Freeze PM callback
+ * @dev: iucv-based device
+ *
+ * disable iucv interrupts
+ * invoke callback function of the iucv-based driver
+ * shut down iucv, if no iucv-pathes are established anymore
+ */
+static int iucv_pm_freeze(struct device *dev)
+{
+ int cpu;
+ struct iucv_irq_list *p, *n;
+ int rc = 0;
+
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "iucv_pm_freeze\n");
+#endif
+ if (iucv_pm_state != IUCV_PM_FREEZING) {
+ for_each_cpu(cpu, &iucv_irq_cpumask)
+ smp_call_function_single(cpu, iucv_block_cpu_almost,
+ NULL, 1);
+ cancel_work_sync(&iucv_work);
+ list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
+ list_del_init(&p->list);
+ iucv_sever_pathid(p->data.ippathid,
+ iucv_error_no_listener);
+ kfree(p);
+ }
+ }
+ iucv_pm_state = IUCV_PM_FREEZING;
+ if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
+ rc = dev->driver->pm->freeze(dev);
+ if (iucv_path_table_empty())
+ iucv_disable();
+ return rc;
+}
+
+/**
+ * iucv_pm_thaw() - Thaw PM callback
+ * @dev: iucv-based device
+ *
+ * make iucv ready for use again: allocate path table, declare interrupt buffers
+ * and enable iucv interrupts
+ * invoke callback function of the iucv-based driver
+ */
+static int iucv_pm_thaw(struct device *dev)
+{
+ int rc = 0;
+
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "iucv_pm_thaw\n");
+#endif
+ iucv_pm_state = IUCV_PM_THAWING;
+ if (!iucv_path_table) {
+ rc = iucv_enable();
+ if (rc)
+ goto out;
+ }
+ if (cpumask_empty(&iucv_irq_cpumask)) {
+ if (iucv_nonsmp_handler)
+ /* enable interrupts on one cpu */
+ iucv_allow_cpu(NULL);
+ else
+ /* enable interrupts on all cpus */
+ iucv_setmask_mp();
+ }
+ if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
+ rc = dev->driver->pm->thaw(dev);
+out:
+ return rc;
+}
+
+/**
+ * iucv_pm_restore() - Restore PM callback
+ * @dev: iucv-based device
+ *
+ * make iucv ready for use again: allocate path table, declare interrupt buffers
+ * and enable iucv interrupts
+ * invoke callback function of the iucv-based driver
+ */
+static int iucv_pm_restore(struct device *dev)
+{
+ int rc = 0;
+
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
+#endif
+ if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
+ pr_warn("Suspending Linux did not completely close all IUCV connections\n");
+ iucv_pm_state = IUCV_PM_RESTORING;
+ if (cpumask_empty(&iucv_irq_cpumask)) {
+ rc = iucv_query_maxconn();
+ rc = iucv_enable();
+ if (rc)
+ goto out;
+ }
+ if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
+ rc = dev->driver->pm->restore(dev);
+out:
+ return rc;
+}
+
+struct iucv_interface iucv_if = {
+ .message_receive = iucv_message_receive,
+ .__message_receive = __iucv_message_receive,
+ .message_reply = iucv_message_reply,
+ .message_reject = iucv_message_reject,
+ .message_send = iucv_message_send,
+ .__message_send = __iucv_message_send,
+ .message_send2way = iucv_message_send2way,
+ .message_purge = iucv_message_purge,
+ .path_accept = iucv_path_accept,
+ .path_connect = iucv_path_connect,
+ .path_quiesce = iucv_path_quiesce,
+ .path_resume = iucv_path_resume,
+ .path_sever = iucv_path_sever,
+ .iucv_register = iucv_register,
+ .iucv_unregister = iucv_unregister,
+ .bus = NULL,
+ .root = NULL,
+};
+EXPORT_SYMBOL(iucv_if);
+
+static enum cpuhp_state iucv_online;
+/**
+ * iucv_init
+ *
+ * Allocates and initializes various data structures.
+ */
+static int __init iucv_init(void)
+{
+ int rc;
+
+ if (!MACHINE_IS_VM) {
+ rc = -EPROTONOSUPPORT;
+ goto out;
+ }
+ ctl_set_bit(0, 1);
+ rc = iucv_query_maxconn();
+ if (rc)
+ goto out_ctl;
+ rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
+ if (rc)
+ goto out_ctl;
+ iucv_root = root_device_register("iucv");
+ if (IS_ERR(iucv_root)) {
+ rc = PTR_ERR(iucv_root);
+ goto out_int;
+ }
+
+ rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare",
+ iucv_cpu_prepare, iucv_cpu_dead);
+ if (rc)
+ goto out_dev;
+ rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online",
+ iucv_cpu_online, iucv_cpu_down_prep);
+ if (rc < 0)
+ goto out_prep;
+ iucv_online = rc;
+
+ rc = register_reboot_notifier(&iucv_reboot_notifier);
+ if (rc)
+ goto out_remove_hp;
+ ASCEBC(iucv_error_no_listener, 16);
+ ASCEBC(iucv_error_no_memory, 16);
+ ASCEBC(iucv_error_pathid, 16);
+ iucv_available = 1;
+ rc = bus_register(&iucv_bus);
+ if (rc)
+ goto out_reboot;
+ iucv_if.root = iucv_root;
+ iucv_if.bus = &iucv_bus;
+ return 0;
+
+out_reboot:
+ unregister_reboot_notifier(&iucv_reboot_notifier);
+out_remove_hp:
+ cpuhp_remove_state(iucv_online);
+out_prep:
+ cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
+out_dev:
+ root_device_unregister(iucv_root);
+out_int:
+ unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
+out_ctl:
+ ctl_clear_bit(0, 1);
+out:
+ return rc;
+}
+
+/**
+ * iucv_exit
+ *
+ * Frees everything allocated from iucv_init.
+ */
+static void __exit iucv_exit(void)
+{
+ struct iucv_irq_list *p, *n;
+
+ spin_lock_irq(&iucv_queue_lock);
+ list_for_each_entry_safe(p, n, &iucv_task_queue, list)
+ kfree(p);
+ list_for_each_entry_safe(p, n, &iucv_work_queue, list)
+ kfree(p);
+ spin_unlock_irq(&iucv_queue_lock);
+ unregister_reboot_notifier(&iucv_reboot_notifier);
+
+ cpuhp_remove_state_nocalls(iucv_online);
+ cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
+ root_device_unregister(iucv_root);
+ bus_unregister(&iucv_bus);
+ unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
+}
+
+subsys_initcall(iucv_init);
+module_exit(iucv_exit);
+
+MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
+MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
+MODULE_LICENSE("GPL");