android_kernel_xiaomi_sm8350/net/iucv/iucv.c
Rafael J. Wysocki 8bb7844286 Add suspend-related notifications for CPU hotplug
Since nonboot CPUs are now disabled after tasks and devices have been
frozen and the CPU hotplug infrastructure is used for this purpose, we need
special CPU hotplug notifications that will help the CPU-hotplug-aware
subsystems distinguish normal CPU hotplug events from CPU hotplug events
related to a system-wide suspend or resume operation in progress.  This
patch introduces such notifications and causes them to be used during
suspend and resume transitions.  It also changes all of the
CPU-hotplug-aware subsystems to take these notifications into consideration
(for now they are handled in the same way as the corresponding "normal"
ones).

[oleg@tv-sign.ru: cleanups]
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-09 12:30:56 -07:00

1678 lines
43 KiB
C

/*
* IUCV base infrastructure.
*
* Copyright 2001, 2006 IBM Deutschland Entwicklung GmbH, IBM Corporation
* 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>
*
* 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.
*/
#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 <net/iucv/iucv.h>
#include <asm/atomic.h>
#include <asm/ebcdic.h>
#include <asm/io.h>
#include <asm/s390_ext.h>
#include <asm/s390_rdev.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;
static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
static cpumask_t iucv_irq_cpumask = CPU_MASK_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,
};
/*
* 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;
/**
* 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 = virt_to_phys(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 == 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)
{
register unsigned long reg0 asm ("0");
register unsigned long reg1 asm ("1");
void *param;
int ccode;
param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
if (!param)
return -ENOMEM;
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");
if (ccode == 0)
iucv_max_pathid = reg0;
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 = percpu_ptr(iucv_param, smp_processor_id());
memset(parm, 0, sizeof(union iucv_param));
parm->set_mask.ipmask = 0xf8;
iucv_call_b2f0(IUCV_SETMASK, parm);
/* Set indication that iucv interrupts are allowed for this cpu. */
cpu_set(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 = percpu_ptr(iucv_param, smp_processor_id());
memset(parm, 0, sizeof(union iucv_param));
iucv_call_b2f0(IUCV_SETMASK, parm);
/* Clear indication that iucv interrupts are allowed for this cpu. */
cpu_clear(cpu, iucv_irq_cpumask);
}
/**
* iucv_declare_cpu
* @data: unused
*
* Declare a interupt buffer on this cpu.
*/
static void iucv_declare_cpu(void *data)
{
int cpu = smp_processor_id();
union iucv_param *parm;
int rc;
if (cpu_isset(cpu, iucv_buffer_cpumask))
return;
/* Declare interrupt buffer. */
parm = percpu_ptr(iucv_param, cpu);
memset(parm, 0, sizeof(union iucv_param));
parm->db.ipbfadr1 = virt_to_phys(percpu_ptr(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;
}
printk(KERN_WARNING "iucv_register: iucv_declare_buffer "
"on cpu %i returned error 0x%02x (%s)\n", cpu, rc, err);
return;
}
/* Set indication that an iucv buffer exists for this cpu. */
cpu_set(cpu, iucv_buffer_cpumask);
if (iucv_nonsmp_handler == 0 || cpus_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 (!cpu_isset(cpu, iucv_buffer_cpumask))
return;
/* Block iucv interrupts. */
iucv_block_cpu(NULL);
/* Retrieve interrupt buffer. */
parm = percpu_ptr(iucv_param, cpu);
iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
/* Clear indication that an iucv buffer exists for this cpu. */
cpu_clear(cpu, iucv_buffer_cpumask);
}
/**
* iucv_setmask_smp
*
* Allow iucv interrupts on all cpus.
*/
static void iucv_setmask_mp(void)
{
int cpu;
preempt_disable();
for_each_online_cpu(cpu)
/* Enable all cpus with a declared buffer. */
if (cpu_isset(cpu, iucv_buffer_cpumask) &&
!cpu_isset(cpu, iucv_irq_cpumask))
smp_call_function_on(iucv_allow_cpu, NULL, 0, 1, cpu);
preempt_enable();
}
/**
* 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 = iucv_irq_cpumask;
cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
for_each_cpu_mask(cpu, cpumask)
smp_call_function_on(iucv_block_cpu, NULL, 0, 1, cpu);
}
/**
* 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;
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;
preempt_disable();
for_each_online_cpu(cpu)
smp_call_function_on(iucv_declare_cpu, NULL, 0, 1, cpu);
preempt_enable();
if (cpus_empty(iucv_buffer_cpumask))
/* No cpu could declare an iucv buffer. */
goto out_path;
return 0;
out_path:
kfree(iucv_path_table);
out:
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)
{
on_each_cpu(iucv_retrieve_cpu, NULL, 0, 1);
kfree(iucv_path_table);
}
static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
cpumask_t cpumask;
long cpu = (long) hcpu;
switch (action) {
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
if (!percpu_populate(iucv_irq_data,
sizeof(struct iucv_irq_data),
GFP_KERNEL|GFP_DMA, cpu))
return NOTIFY_BAD;
if (!percpu_populate(iucv_param, sizeof(union iucv_param),
GFP_KERNEL|GFP_DMA, cpu)) {
percpu_depopulate(iucv_irq_data, cpu);
return NOTIFY_BAD;
}
break;
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
case CPU_DEAD:
case CPU_DEAD_FROZEN:
percpu_depopulate(iucv_param, cpu);
percpu_depopulate(iucv_irq_data, cpu);
break;
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
smp_call_function_on(iucv_declare_cpu, NULL, 0, 1, cpu);
break;
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
cpumask = iucv_buffer_cpumask;
cpu_clear(cpu, cpumask);
if (cpus_empty(cpumask))
/* Can't offline last IUCV enabled cpu. */
return NOTIFY_BAD;
smp_call_function_on(iucv_retrieve_cpu, NULL, 0, 1, cpu);
if (cpus_empty(iucv_irq_cpumask))
smp_call_function_on(iucv_allow_cpu, NULL, 0, 1,
first_cpu(iucv_buffer_cpumask));
break;
}
return NOTIFY_OK;
}
static struct notifier_block __cpuinitdata iucv_cpu_notifier = {
.notifier_call = iucv_cpu_notify,
};
/**
* 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[16])
{
union iucv_param *parm;
parm = percpu_ptr(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 = pathid;
return iucv_call_b2f0(IUCV_SEVER, parm);
}
#ifdef CONFIG_SMP
/**
* __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)
{
}
#endif
/**
* 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 immediatly
* 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, 0, 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_irq(&iucv_table_lock);
list_add_tail(&handler->list, &iucv_handler_list);
spin_unlock_irq(&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 refering 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);
/**
* 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[16], void *private)
{
union iucv_param *parm;
int rc;
local_bh_disable();
/* Prepare parameter block. */
parm = percpu_ptr(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;
}
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[8], u8 system[8], u8 userdata[16],
void *private)
{
union iucv_param *parm;
int rc;
BUG_ON(in_atomic());
spin_lock_bh(&iucv_table_lock);
iucv_cleanup_queue();
parm = percpu_ptr(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;
}
}
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[16])
{
union iucv_param *parm;
int rc;
local_bh_disable();
parm = percpu_ptr(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);
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[16])
{
union iucv_param *parm;
int rc;
local_bh_disable();
parm = percpu_ptr(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);
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[16])
{
int rc;
preempt_disable();
if (iucv_active_cpu != smp_processor_id())
spin_lock_bh(&iucv_table_lock);
rc = iucv_sever_pathid(path->pathid, userdata);
if (!rc) {
iucv_path_table[path->pathid] = NULL;
list_del_init(&path->list);
}
if (iucv_active_cpu != smp_processor_id())
spin_unlock_bh(&iucv_table_lock);
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();
parm = percpu_ptr(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;
}
local_bh_enable();
return rc;
}
EXPORT_SYMBOL(iucv_message_purge);
/**
* 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.
*
* 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;
struct iucv_array *array;
u8 *rmmsg;
size_t copy;
int rc;
if (msg->flags & IUCV_IPRMDATA) {
/*
* Message is 8 bytes long and has been stored to the
* message descriptor itself.
*/
rc = (size < 8) ? 5 : 0;
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;
}
local_bh_disable();
parm = percpu_ptr(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;
}
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();
parm = percpu_ptr(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);
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();
parm = percpu_ptr(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);
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.
*
* 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;
local_bh_disable();
parm = percpu_ptr(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;
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();
parm = percpu_ptr(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;
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];
} __attribute__ ((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];
} __attribute__ ((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->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];
} __attribute__ ((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_init(&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];
} __attribute__ ((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];
} __attribute__ ((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];
} __attribute__ ((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];
} __attribute__ ((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,
};
struct list_head task_queue = LIST_HEAD_INIT(task_queue);
struct iucv_irq_list *p, *n;
/* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
spin_lock(&iucv_table_lock);
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)
{
typedef void iucv_irq_fn(struct iucv_irq_data *);
struct list_head work_queue = LIST_HEAD_INIT(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(u16 code)
{
struct iucv_irq_data *p;
struct iucv_irq_list *work;
p = percpu_ptr(iucv_irq_data, smp_processor_id());
if (p->ippathid >= iucv_max_pathid) {
printk(KERN_WARNING "iucv_do_int: Got interrupt with "
"pathid %d > max_connections (%ld)\n",
p->ippathid, iucv_max_pathid - 1);
iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
return;
}
if (p->iptype < 0x01 || p->iptype > 0x09) {
printk(KERN_ERR "iucv_do_int: unknown iucv interrupt\n");
return;
}
work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
if (!work) {
printk(KERN_WARNING "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);
}
/**
* iucv_init
*
* Allocates and initializes various data structures.
*/
static int __init iucv_init(void)
{
int rc;
if (!MACHINE_IS_VM) {
rc = -EPROTONOSUPPORT;
goto out;
}
rc = iucv_query_maxconn();
if (rc)
goto out;
rc = register_external_interrupt(0x4000, iucv_external_interrupt);
if (rc)
goto out;
rc = bus_register(&iucv_bus);
if (rc)
goto out_int;
iucv_root = s390_root_dev_register("iucv");
if (IS_ERR(iucv_root)) {
rc = PTR_ERR(iucv_root);
goto out_bus;
}
/* Note: GFP_DMA used to get memory below 2G */
iucv_irq_data = percpu_alloc(sizeof(struct iucv_irq_data),
GFP_KERNEL|GFP_DMA);
if (!iucv_irq_data) {
rc = -ENOMEM;
goto out_root;
}
/* Allocate parameter blocks. */
iucv_param = percpu_alloc(sizeof(union iucv_param),
GFP_KERNEL|GFP_DMA);
if (!iucv_param) {
rc = -ENOMEM;
goto out_extint;
}
register_hotcpu_notifier(&iucv_cpu_notifier);
ASCEBC(iucv_error_no_listener, 16);
ASCEBC(iucv_error_no_memory, 16);
ASCEBC(iucv_error_pathid, 16);
iucv_available = 1;
return 0;
out_extint:
percpu_free(iucv_irq_data);
out_root:
s390_root_dev_unregister(iucv_root);
out_bus:
bus_unregister(&iucv_bus);
out_int:
unregister_external_interrupt(0x4000, iucv_external_interrupt);
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_hotcpu_notifier(&iucv_cpu_notifier);
percpu_free(iucv_param);
percpu_free(iucv_irq_data);
s390_root_dev_unregister(iucv_root);
bus_unregister(&iucv_bus);
unregister_external_interrupt(0x4000, 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");