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iucv.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IUCV base infrastructure.
*
* Copyright IBM Corp. 2001, 2009
*
* Author(s):
* Original source:
* Alan Altmark ([email protected]) Sept. 2000
* Xenia Tkatschow ([email protected])
* 2Gb awareness and general cleanup:
* Fritz Elfert ([email protected], [email protected])
* Rewritten for af_iucv:
* Martin Schwidefsky <[email protected]>
* PM functions:
* Ursula Braun ([email protected])
*
* Documentation used:
* The original source
* CP Programming Service, IBM document # SC24-5760
*/
#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;
}
struct bus_type iucv_bus = {
.name = "iucv",
.match = iucv_bus_match,
};
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_OLD(iucv_tasklet, iucv_tasklet_fn);
/*
* 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_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;