1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IUCV base infrastructure.
5 * Copyright IBM Corp. 2001, 2009
9 * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
10 * Xenia Tkatschow (xenia@us.ibm.com)
11 * 2Gb awareness and general cleanup:
12 * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
13 * Rewritten for af_iucv:
14 * Martin Schwidefsky <schwidefsky@de.ibm.com>
16 * Ursula Braun (ursula.braun@de.ibm.com)
20 * CP Programming Service, IBM document # SC24-5760
23 #define KMSG_COMPONENT "iucv"
24 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
26 #include <linux/kernel_stat.h>
27 #include <linux/module.h>
28 #include <linux/moduleparam.h>
29 #include <linux/spinlock.h>
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/init.h>
33 #include <linux/interrupt.h>
34 #include <linux/list.h>
35 #include <linux/errno.h>
36 #include <linux/err.h>
37 #include <linux/device.h>
38 #include <linux/cpu.h>
39 #include <linux/reboot.h>
40 #include <net/iucv/iucv.h>
41 #include <linux/atomic.h>
42 #include <asm/ebcdic.h>
49 * All flags are defined in the field IPFLAGS1 of each function
50 * and can be found in CP Programming Services.
51 * IPSRCCLS - Indicates you have specified a source class.
52 * IPTRGCLS - Indicates you have specified a target class.
53 * IPFGPID - Indicates you have specified a pathid.
54 * IPFGMID - Indicates you have specified a message ID.
55 * IPNORPY - Indicates a one-way message. No reply expected.
56 * IPALL - Indicates that all paths are affected.
58 #define IUCV_IPSRCCLS 0x01
59 #define IUCV_IPTRGCLS 0x01
60 #define IUCV_IPFGPID 0x02
61 #define IUCV_IPFGMID 0x04
62 #define IUCV_IPNORPY 0x10
63 #define IUCV_IPALL 0x80
65 static int iucv_bus_match(struct device
*dev
, struct device_driver
*drv
)
70 struct bus_type iucv_bus
= {
72 .match
= iucv_bus_match
,
74 EXPORT_SYMBOL(iucv_bus
);
76 struct device
*iucv_root
;
77 EXPORT_SYMBOL(iucv_root
);
79 static int iucv_available
;
81 /* General IUCV interrupt structure */
82 struct iucv_irq_data
{
89 struct iucv_irq_list
{
90 struct list_head list
;
91 struct iucv_irq_data data
;
94 static struct iucv_irq_data
*iucv_irq_data
[NR_CPUS
];
95 static cpumask_t iucv_buffer_cpumask
= { CPU_BITS_NONE
};
96 static cpumask_t iucv_irq_cpumask
= { CPU_BITS_NONE
};
99 * Queue of interrupt buffers lock for delivery via the tasklet
100 * (fast but can't call smp_call_function).
102 static LIST_HEAD(iucv_task_queue
);
105 * The tasklet for fast delivery of iucv interrupts.
107 static void iucv_tasklet_fn(unsigned long);
108 static DECLARE_TASKLET_OLD(iucv_tasklet
, iucv_tasklet_fn
);
111 * Queue of interrupt buffers for delivery via a work queue
112 * (slower but can call smp_call_function).
114 static LIST_HEAD(iucv_work_queue
);
117 * The work element to deliver path pending interrupts.
119 static void iucv_work_fn(struct work_struct
*work
);
120 static DECLARE_WORK(iucv_work
, iucv_work_fn
);
123 * Spinlock protecting task and work queue.
125 static DEFINE_SPINLOCK(iucv_queue_lock
);
127 enum iucv_command_codes
{
129 IUCV_RETRIEVE_BUFFER
= 2,
137 IUCV_DECLARE_BUFFER
= 12,
142 IUCV_SETCONTROLMASK
= 17,
146 * Error messages that are used with the iucv_sever function. They get
147 * converted to EBCDIC.
149 static char iucv_error_no_listener
[16] = "NO LISTENER";
150 static char iucv_error_no_memory
[16] = "NO MEMORY";
151 static char iucv_error_pathid
[16] = "INVALID PATHID";
154 * iucv_handler_list: List of registered handlers.
156 static LIST_HEAD(iucv_handler_list
);
159 * iucv_path_table: an array of iucv_path structures.
161 static struct iucv_path
**iucv_path_table
;
162 static unsigned long iucv_max_pathid
;
165 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
167 static DEFINE_SPINLOCK(iucv_table_lock
);
170 * iucv_active_cpu: contains the number of the cpu executing the tasklet
171 * or the work handler. Needed for iucv_path_sever called from tasklet.
173 static int iucv_active_cpu
= -1;
176 * Mutex and wait queue for iucv_register/iucv_unregister.
178 static DEFINE_MUTEX(iucv_register_mutex
);
181 * Counter for number of non-smp capable handlers.
183 static int iucv_nonsmp_handler
;
186 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
187 * iucv_path_quiesce and iucv_path_sever.
189 struct iucv_cmd_control
{
198 } __attribute__ ((packed
,aligned(8)));
201 * Data in parameter list iucv structure. Used by iucv_message_send,
202 * iucv_message_send2way and iucv_message_reply.
204 struct iucv_cmd_dpl
{
216 } __attribute__ ((packed
,aligned(8)));
219 * Data in buffer iucv structure. Used by iucv_message_receive,
220 * iucv_message_reject, iucv_message_send, iucv_message_send2way
221 * and iucv_declare_cpu.
236 } __attribute__ ((packed
,aligned(8)));
239 * Purge message iucv structure. Used by iucv_message_purge.
241 struct iucv_cmd_purge
{
252 } __attribute__ ((packed
,aligned(8)));
255 * Set mask iucv structure. Used by iucv_enable_cpu.
257 struct iucv_cmd_set_mask
{
262 } __attribute__ ((packed
,aligned(8)));
265 struct iucv_cmd_control ctrl
;
266 struct iucv_cmd_dpl dpl
;
267 struct iucv_cmd_db db
;
268 struct iucv_cmd_purge purge
;
269 struct iucv_cmd_set_mask set_mask
;
273 * Anchor for per-cpu IUCV command parameter block.
275 static union iucv_param
*iucv_param
[NR_CPUS
];
276 static union iucv_param
*iucv_param_irq
[NR_CPUS
];
280 * @code: identifier of IUCV call to CP.
281 * @parm: pointer to a struct iucv_parm block
283 * Calls CP to execute IUCV commands.
285 * Returns the result of the CP IUCV call.
287 static inline int __iucv_call_b2f0(int command
, union iucv_param
*parm
)
289 register unsigned long reg0
asm ("0");
290 register unsigned long reg1
asm ("1");
294 reg1
= (unsigned long)parm
;
296 " .long 0xb2f01000\n"
299 : "=d" (ccode
), "=m" (*parm
), "+d" (reg0
), "+a" (reg1
)
300 : "m" (*parm
) : "cc");
304 static inline int iucv_call_b2f0(int command
, union iucv_param
*parm
)
308 ccode
= __iucv_call_b2f0(command
, parm
);
309 return ccode
== 1 ? parm
->ctrl
.iprcode
: ccode
;
315 * Determines the maximum number of connections that may be established.
317 * Returns the maximum number of connections or -EPERM is IUCV is not
320 static int __iucv_query_maxconn(void *param
, unsigned long *max_pathid
)
322 register unsigned long reg0
asm ("0");
323 register unsigned long reg1
asm ("1");
327 reg1
= (unsigned long) param
;
329 " .long 0xb2f01000\n"
332 : "=d" (ccode
), "+d" (reg0
), "+d" (reg1
) : : "cc");
337 static int iucv_query_maxconn(void)
339 unsigned long max_pathid
;
343 param
= kzalloc(sizeof(union iucv_param
), GFP_KERNEL
| GFP_DMA
);
346 ccode
= __iucv_query_maxconn(param
, &max_pathid
);
348 iucv_max_pathid
= max_pathid
;
350 return ccode
? -EPERM
: 0;
357 * Allow iucv interrupts on this cpu.
359 static void iucv_allow_cpu(void *data
)
361 int cpu
= smp_processor_id();
362 union iucv_param
*parm
;
365 * Enable all iucv interrupts.
366 * ipmask contains bits for the different interrupts
367 * 0x80 - Flag to allow nonpriority message pending interrupts
368 * 0x40 - Flag to allow priority message pending interrupts
369 * 0x20 - Flag to allow nonpriority message completion interrupts
370 * 0x10 - Flag to allow priority message completion interrupts
371 * 0x08 - Flag to allow IUCV control interrupts
373 parm
= iucv_param_irq
[cpu
];
374 memset(parm
, 0, sizeof(union iucv_param
));
375 parm
->set_mask
.ipmask
= 0xf8;
376 iucv_call_b2f0(IUCV_SETMASK
, parm
);
379 * Enable all iucv control interrupts.
380 * ipmask contains bits for the different interrupts
381 * 0x80 - Flag to allow pending connections interrupts
382 * 0x40 - Flag to allow connection complete interrupts
383 * 0x20 - Flag to allow connection severed interrupts
384 * 0x10 - Flag to allow connection quiesced interrupts
385 * 0x08 - Flag to allow connection resumed interrupts
387 memset(parm
, 0, sizeof(union iucv_param
));
388 parm
->set_mask
.ipmask
= 0xf8;
389 iucv_call_b2f0(IUCV_SETCONTROLMASK
, parm
);
390 /* Set indication that iucv interrupts are allowed for this cpu. */
391 cpumask_set_cpu(cpu
, &iucv_irq_cpumask
);
398 * Block iucv interrupts on this cpu.
400 static void iucv_block_cpu(void *data
)
402 int cpu
= smp_processor_id();
403 union iucv_param
*parm
;
405 /* Disable all iucv interrupts. */
406 parm
= iucv_param_irq
[cpu
];
407 memset(parm
, 0, sizeof(union iucv_param
));
408 iucv_call_b2f0(IUCV_SETMASK
, parm
);
410 /* Clear indication that iucv interrupts are allowed for this cpu. */
411 cpumask_clear_cpu(cpu
, &iucv_irq_cpumask
);
418 * Declare a interrupt buffer on this cpu.
420 static void iucv_declare_cpu(void *data
)
422 int cpu
= smp_processor_id();
423 union iucv_param
*parm
;
426 if (cpumask_test_cpu(cpu
, &iucv_buffer_cpumask
))
429 /* Declare interrupt buffer. */
430 parm
= iucv_param_irq
[cpu
];
431 memset(parm
, 0, sizeof(union iucv_param
));
432 parm
->db
.ipbfadr1
= virt_to_phys(iucv_irq_data
[cpu
]);
433 rc
= iucv_call_b2f0(IUCV_DECLARE_BUFFER
, parm
);
435 char *err
= "Unknown";
438 err
= "Directory error";
441 err
= "Invalid length";
444 err
= "Buffer already exists";
447 err
= "Buffer overlap";
450 err
= "Paging or storage error";
453 pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n",
458 /* Set indication that an iucv buffer exists for this cpu. */
459 cpumask_set_cpu(cpu
, &iucv_buffer_cpumask
);
461 if (iucv_nonsmp_handler
== 0 || cpumask_empty(&iucv_irq_cpumask
))
462 /* Enable iucv interrupts on this cpu. */
463 iucv_allow_cpu(NULL
);
465 /* Disable iucv interrupts on this cpu. */
466 iucv_block_cpu(NULL
);
473 * Retrieve interrupt buffer on this cpu.
475 static void iucv_retrieve_cpu(void *data
)
477 int cpu
= smp_processor_id();
478 union iucv_param
*parm
;
480 if (!cpumask_test_cpu(cpu
, &iucv_buffer_cpumask
))
483 /* Block iucv interrupts. */
484 iucv_block_cpu(NULL
);
486 /* Retrieve interrupt buffer. */
487 parm
= iucv_param_irq
[cpu
];
488 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER
, parm
);
490 /* Clear indication that an iucv buffer exists for this cpu. */
491 cpumask_clear_cpu(cpu
, &iucv_buffer_cpumask
);
497 * Allow iucv interrupts on all cpus.
499 static void iucv_setmask_mp(void)
504 for_each_online_cpu(cpu
)
505 /* Enable all cpus with a declared buffer. */
506 if (cpumask_test_cpu(cpu
, &iucv_buffer_cpumask
) &&
507 !cpumask_test_cpu(cpu
, &iucv_irq_cpumask
))
508 smp_call_function_single(cpu
, iucv_allow_cpu
,
516 * Allow iucv interrupts on a single cpu.
518 static void iucv_setmask_up(void)
523 /* Disable all cpu but the first in cpu_irq_cpumask. */
524 cpumask_copy(&cpumask
, &iucv_irq_cpumask
);
525 cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask
), &cpumask
);
526 for_each_cpu(cpu
, &cpumask
)
527 smp_call_function_single(cpu
, iucv_block_cpu
, NULL
, 1);
533 * This function makes iucv ready for use. It allocates the pathid
534 * table, declares an iucv interrupt buffer and enables the iucv
535 * interrupts. Called when the first user has registered an iucv
538 static int iucv_enable(void)
545 alloc_size
= iucv_max_pathid
* sizeof(struct iucv_path
);
546 iucv_path_table
= kzalloc(alloc_size
, GFP_KERNEL
);
547 if (!iucv_path_table
)
549 /* Declare per cpu buffers. */
551 for_each_online_cpu(cpu
)
552 smp_call_function_single(cpu
, iucv_declare_cpu
, NULL
, 1);
553 if (cpumask_empty(&iucv_buffer_cpumask
))
554 /* No cpu could declare an iucv buffer. */
559 kfree(iucv_path_table
);
560 iucv_path_table
= NULL
;
568 * This function shuts down iucv. It disables iucv interrupts, retrieves
569 * the iucv interrupt buffer and frees the pathid table. Called after the
570 * last user unregister its iucv handler.
572 static void iucv_disable(void)
575 on_each_cpu(iucv_retrieve_cpu
, NULL
, 1);
576 kfree(iucv_path_table
);
577 iucv_path_table
= NULL
;
581 static int iucv_cpu_dead(unsigned int cpu
)
583 kfree(iucv_param_irq
[cpu
]);
584 iucv_param_irq
[cpu
] = NULL
;
585 kfree(iucv_param
[cpu
]);
586 iucv_param
[cpu
] = NULL
;
587 kfree(iucv_irq_data
[cpu
]);
588 iucv_irq_data
[cpu
] = NULL
;
592 static int iucv_cpu_prepare(unsigned int cpu
)
594 /* Note: GFP_DMA used to get memory below 2G */
595 iucv_irq_data
[cpu
] = kmalloc_node(sizeof(struct iucv_irq_data
),
596 GFP_KERNEL
|GFP_DMA
, cpu_to_node(cpu
));
597 if (!iucv_irq_data
[cpu
])
600 /* Allocate parameter blocks. */
601 iucv_param
[cpu
] = kmalloc_node(sizeof(union iucv_param
),
602 GFP_KERNEL
|GFP_DMA
, cpu_to_node(cpu
));
603 if (!iucv_param
[cpu
])
606 iucv_param_irq
[cpu
] = kmalloc_node(sizeof(union iucv_param
),
607 GFP_KERNEL
|GFP_DMA
, cpu_to_node(cpu
));
608 if (!iucv_param_irq
[cpu
])
618 static int iucv_cpu_online(unsigned int cpu
)
620 if (!iucv_path_table
)
622 iucv_declare_cpu(NULL
);
626 static int iucv_cpu_down_prep(unsigned int cpu
)
630 if (!iucv_path_table
)
633 cpumask_copy(&cpumask
, &iucv_buffer_cpumask
);
634 cpumask_clear_cpu(cpu
, &cpumask
);
635 if (cpumask_empty(&cpumask
))
636 /* Can't offline last IUCV enabled cpu. */
639 iucv_retrieve_cpu(NULL
);
640 if (!cpumask_empty(&iucv_irq_cpumask
))
642 smp_call_function_single(cpumask_first(&iucv_buffer_cpumask
),
643 iucv_allow_cpu
, NULL
, 1);
649 * @pathid: path identification number.
650 * @userdata: 16-bytes of user data.
652 * Sever an iucv path to free up the pathid. Used internally.
654 static int iucv_sever_pathid(u16 pathid
, u8
*userdata
)
656 union iucv_param
*parm
;
658 parm
= iucv_param_irq
[smp_processor_id()];
659 memset(parm
, 0, sizeof(union iucv_param
));
661 memcpy(parm
->ctrl
.ipuser
, userdata
, sizeof(parm
->ctrl
.ipuser
));
662 parm
->ctrl
.ippathid
= pathid
;
663 return iucv_call_b2f0(IUCV_SEVER
, parm
);
667 * __iucv_cleanup_queue
668 * @dummy: unused dummy argument
670 * Nop function called via smp_call_function to force work items from
671 * pending external iucv interrupts to the work queue.
673 static void __iucv_cleanup_queue(void *dummy
)
680 * Function called after a path has been severed to find all remaining
681 * work items for the now stale pathid. The caller needs to hold the
684 static void iucv_cleanup_queue(void)
686 struct iucv_irq_list
*p
, *n
;
689 * When a path is severed, the pathid can be reused immediately
690 * on a iucv connect or a connection pending interrupt. Remove
691 * all entries from the task queue that refer to a stale pathid
692 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
693 * or deliver the connection pending interrupt. To get all the
694 * pending interrupts force them to the work queue by calling
695 * an empty function on all cpus.
697 smp_call_function(__iucv_cleanup_queue
, NULL
, 1);
698 spin_lock_irq(&iucv_queue_lock
);
699 list_for_each_entry_safe(p
, n
, &iucv_task_queue
, list
) {
700 /* Remove stale work items from the task queue. */
701 if (iucv_path_table
[p
->data
.ippathid
] == NULL
) {
706 spin_unlock_irq(&iucv_queue_lock
);
711 * @handler: address of iucv handler structure
712 * @smp: != 0 indicates that the handler can deal with out of order messages
714 * Registers a driver with IUCV.
716 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
717 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
719 int iucv_register(struct iucv_handler
*handler
, int smp
)
725 mutex_lock(&iucv_register_mutex
);
727 iucv_nonsmp_handler
++;
728 if (list_empty(&iucv_handler_list
)) {
732 } else if (!smp
&& iucv_nonsmp_handler
== 1)
734 INIT_LIST_HEAD(&handler
->paths
);
736 spin_lock_bh(&iucv_table_lock
);
737 list_add_tail(&handler
->list
, &iucv_handler_list
);
738 spin_unlock_bh(&iucv_table_lock
);
741 mutex_unlock(&iucv_register_mutex
);
744 EXPORT_SYMBOL(iucv_register
);
748 * @handler: address of iucv handler structure
749 * @smp: != 0 indicates that the handler can deal with out of order messages
751 * Unregister driver from IUCV.
753 void iucv_unregister(struct iucv_handler
*handler
, int smp
)
755 struct iucv_path
*p
, *n
;
757 mutex_lock(&iucv_register_mutex
);
758 spin_lock_bh(&iucv_table_lock
);
759 /* Remove handler from the iucv_handler_list. */
760 list_del_init(&handler
->list
);
761 /* Sever all pathids still referring to the handler. */
762 list_for_each_entry_safe(p
, n
, &handler
->paths
, list
) {
763 iucv_sever_pathid(p
->pathid
, NULL
);
764 iucv_path_table
[p
->pathid
] = NULL
;
768 spin_unlock_bh(&iucv_table_lock
);
770 iucv_nonsmp_handler
--;
771 if (list_empty(&iucv_handler_list
))
773 else if (!smp
&& iucv_nonsmp_handler
== 0)
775 mutex_unlock(&iucv_register_mutex
);
777 EXPORT_SYMBOL(iucv_unregister
);
779 static int iucv_reboot_event(struct notifier_block
*this,
780 unsigned long event
, void *ptr
)
784 if (cpumask_empty(&iucv_irq_cpumask
))
788 on_each_cpu_mask(&iucv_irq_cpumask
, iucv_block_cpu
, NULL
, 1);
790 for (i
= 0; i
< iucv_max_pathid
; i
++) {
791 if (iucv_path_table
[i
])
792 iucv_sever_pathid(i
, NULL
);
800 static struct notifier_block iucv_reboot_notifier
= {
801 .notifier_call
= iucv_reboot_event
,
806 * @path: address of iucv path structure
807 * @handler: address of iucv handler structure
808 * @userdata: 16 bytes of data reflected to the communication partner
809 * @private: private data passed to interrupt handlers for this path
811 * This function is issued after the user received a connection pending
812 * external interrupt and now wishes to complete the IUCV communication path.
814 * Returns the result of the CP IUCV call.
816 int iucv_path_accept(struct iucv_path
*path
, struct iucv_handler
*handler
,
817 u8
*userdata
, void *private)
819 union iucv_param
*parm
;
823 if (cpumask_empty(&iucv_buffer_cpumask
)) {
827 /* Prepare parameter block. */
828 parm
= iucv_param
[smp_processor_id()];
829 memset(parm
, 0, sizeof(union iucv_param
));
830 parm
->ctrl
.ippathid
= path
->pathid
;
831 parm
->ctrl
.ipmsglim
= path
->msglim
;
833 memcpy(parm
->ctrl
.ipuser
, userdata
, sizeof(parm
->ctrl
.ipuser
));
834 parm
->ctrl
.ipflags1
= path
->flags
;
836 rc
= iucv_call_b2f0(IUCV_ACCEPT
, parm
);
838 path
->private = private;
839 path
->msglim
= parm
->ctrl
.ipmsglim
;
840 path
->flags
= parm
->ctrl
.ipflags1
;
846 EXPORT_SYMBOL(iucv_path_accept
);
850 * @path: address of iucv path structure
851 * @handler: address of iucv handler structure
852 * @userid: 8-byte user identification
853 * @system: 8-byte target system identification
854 * @userdata: 16 bytes of data reflected to the communication partner
855 * @private: private data passed to interrupt handlers for this path
857 * This function establishes an IUCV path. Although the connect may complete
858 * successfully, you are not able to use the path until you receive an IUCV
859 * Connection Complete external interrupt.
861 * Returns the result of the CP IUCV call.
863 int iucv_path_connect(struct iucv_path
*path
, struct iucv_handler
*handler
,
864 u8
*userid
, u8
*system
, u8
*userdata
,
867 union iucv_param
*parm
;
870 spin_lock_bh(&iucv_table_lock
);
871 iucv_cleanup_queue();
872 if (cpumask_empty(&iucv_buffer_cpumask
)) {
876 parm
= iucv_param
[smp_processor_id()];
877 memset(parm
, 0, sizeof(union iucv_param
));
878 parm
->ctrl
.ipmsglim
= path
->msglim
;
879 parm
->ctrl
.ipflags1
= path
->flags
;
881 memcpy(parm
->ctrl
.ipvmid
, userid
, sizeof(parm
->ctrl
.ipvmid
));
882 ASCEBC(parm
->ctrl
.ipvmid
, sizeof(parm
->ctrl
.ipvmid
));
883 EBC_TOUPPER(parm
->ctrl
.ipvmid
, sizeof(parm
->ctrl
.ipvmid
));
886 memcpy(parm
->ctrl
.iptarget
, system
,
887 sizeof(parm
->ctrl
.iptarget
));
888 ASCEBC(parm
->ctrl
.iptarget
, sizeof(parm
->ctrl
.iptarget
));
889 EBC_TOUPPER(parm
->ctrl
.iptarget
, sizeof(parm
->ctrl
.iptarget
));
892 memcpy(parm
->ctrl
.ipuser
, userdata
, sizeof(parm
->ctrl
.ipuser
));
894 rc
= iucv_call_b2f0(IUCV_CONNECT
, parm
);
896 if (parm
->ctrl
.ippathid
< iucv_max_pathid
) {
897 path
->pathid
= parm
->ctrl
.ippathid
;
898 path
->msglim
= parm
->ctrl
.ipmsglim
;
899 path
->flags
= parm
->ctrl
.ipflags1
;
900 path
->handler
= handler
;
901 path
->private = private;
902 list_add_tail(&path
->list
, &handler
->paths
);
903 iucv_path_table
[path
->pathid
] = path
;
905 iucv_sever_pathid(parm
->ctrl
.ippathid
,
911 spin_unlock_bh(&iucv_table_lock
);
914 EXPORT_SYMBOL(iucv_path_connect
);
918 * @path: address of iucv path structure
919 * @userdata: 16 bytes of data reflected to the communication partner
921 * This function temporarily suspends incoming messages on an IUCV path.
922 * You can later reactivate the path by invoking the iucv_resume function.
924 * Returns the result from the CP IUCV call.
926 int iucv_path_quiesce(struct iucv_path
*path
, u8
*userdata
)
928 union iucv_param
*parm
;
932 if (cpumask_empty(&iucv_buffer_cpumask
)) {
936 parm
= iucv_param
[smp_processor_id()];
937 memset(parm
, 0, sizeof(union iucv_param
));
939 memcpy(parm
->ctrl
.ipuser
, userdata
, sizeof(parm
->ctrl
.ipuser
));
940 parm
->ctrl
.ippathid
= path
->pathid
;
941 rc
= iucv_call_b2f0(IUCV_QUIESCE
, parm
);
946 EXPORT_SYMBOL(iucv_path_quiesce
);
950 * @path: address of iucv path structure
951 * @userdata: 16 bytes of data reflected to the communication partner
953 * This function resumes incoming messages on an IUCV path that has
954 * been stopped with iucv_path_quiesce.
956 * Returns the result from the CP IUCV call.
958 int iucv_path_resume(struct iucv_path
*path
, u8
*userdata
)
960 union iucv_param
*parm
;
964 if (cpumask_empty(&iucv_buffer_cpumask
)) {
968 parm
= iucv_param
[smp_processor_id()];
969 memset(parm
, 0, sizeof(union iucv_param
));
971 memcpy(parm
->ctrl
.ipuser
, userdata
, sizeof(parm
->ctrl
.ipuser
));
972 parm
->ctrl
.ippathid
= path
->pathid
;
973 rc
= iucv_call_b2f0(IUCV_RESUME
, parm
);
981 * @path: address of iucv path structure
982 * @userdata: 16 bytes of data reflected to the communication partner
984 * This function terminates an IUCV path.
986 * Returns the result from the CP IUCV call.
988 int iucv_path_sever(struct iucv_path
*path
, u8
*userdata
)
993 if (cpumask_empty(&iucv_buffer_cpumask
)) {
997 if (iucv_active_cpu
!= smp_processor_id())
998 spin_lock_bh(&iucv_table_lock
);
999 rc
= iucv_sever_pathid(path
->pathid
, userdata
);
1000 iucv_path_table
[path
->pathid
] = NULL
;
1001 list_del_init(&path
->list
);
1002 if (iucv_active_cpu
!= smp_processor_id())
1003 spin_unlock_bh(&iucv_table_lock
);
1008 EXPORT_SYMBOL(iucv_path_sever
);
1011 * iucv_message_purge
1012 * @path: address of iucv path structure
1013 * @msg: address of iucv msg structure
1014 * @srccls: source class of message
1016 * Cancels a message you have sent.
1018 * Returns the result from the CP IUCV call.
1020 int iucv_message_purge(struct iucv_path
*path
, struct iucv_message
*msg
,
1023 union iucv_param
*parm
;
1027 if (cpumask_empty(&iucv_buffer_cpumask
)) {
1031 parm
= iucv_param
[smp_processor_id()];
1032 memset(parm
, 0, sizeof(union iucv_param
));
1033 parm
->purge
.ippathid
= path
->pathid
;
1034 parm
->purge
.ipmsgid
= msg
->id
;
1035 parm
->purge
.ipsrccls
= srccls
;
1036 parm
->purge
.ipflags1
= IUCV_IPSRCCLS
| IUCV_IPFGMID
| IUCV_IPFGPID
;
1037 rc
= iucv_call_b2f0(IUCV_PURGE
, parm
);
1039 msg
->audit
= (*(u32
*) &parm
->purge
.ipaudit
) >> 8;
1040 msg
->tag
= parm
->purge
.ipmsgtag
;
1046 EXPORT_SYMBOL(iucv_message_purge
);
1049 * iucv_message_receive_iprmdata
1050 * @path: address of iucv path structure
1051 * @msg: address of iucv msg structure
1052 * @flags: how the message is received (IUCV_IPBUFLST)
1053 * @buffer: address of data buffer or address of struct iucv_array
1054 * @size: length of data buffer
1057 * Internal function used by iucv_message_receive and __iucv_message_receive
1058 * to receive RMDATA data stored in struct iucv_message.
1060 static int iucv_message_receive_iprmdata(struct iucv_path
*path
,
1061 struct iucv_message
*msg
,
1062 u8 flags
, void *buffer
,
1063 size_t size
, size_t *residual
)
1065 struct iucv_array
*array
;
1070 * Message is 8 bytes long and has been stored to the
1071 * message descriptor itself.
1074 *residual
= abs(size
- 8);
1076 if (flags
& IUCV_IPBUFLST
) {
1077 /* Copy to struct iucv_array. */
1078 size
= (size
< 8) ? size
: 8;
1079 for (array
= buffer
; size
> 0; array
++) {
1080 copy
= min_t(size_t, size
, array
->length
);
1081 memcpy((u8
*)(addr_t
) array
->address
,
1087 /* Copy to direct buffer. */
1088 memcpy(buffer
, rmmsg
, min_t(size_t, size
, 8));
1094 * __iucv_message_receive
1095 * @path: address of iucv path structure
1096 * @msg: address of iucv msg structure
1097 * @flags: how the message is received (IUCV_IPBUFLST)
1098 * @buffer: address of data buffer or address of struct iucv_array
1099 * @size: length of data buffer
1102 * This function receives messages that are being sent to you over
1103 * established paths. This function will deal with RMDATA messages
1104 * embedded in struct iucv_message as well.
1106 * Locking: no locking
1108 * Returns the result from the CP IUCV call.
1110 int __iucv_message_receive(struct iucv_path
*path
, struct iucv_message
*msg
,
1111 u8 flags
, void *buffer
, size_t size
, size_t *residual
)
1113 union iucv_param
*parm
;
1116 if (msg
->flags
& IUCV_IPRMDATA
)
1117 return iucv_message_receive_iprmdata(path
, msg
, flags
,
1118 buffer
, size
, residual
);
1119 if (cpumask_empty(&iucv_buffer_cpumask
))
1122 parm
= iucv_param
[smp_processor_id()];
1123 memset(parm
, 0, sizeof(union iucv_param
));
1124 parm
->db
.ipbfadr1
= (u32
)(addr_t
) buffer
;
1125 parm
->db
.ipbfln1f
= (u32
) size
;
1126 parm
->db
.ipmsgid
= msg
->id
;
1127 parm
->db
.ippathid
= path
->pathid
;
1128 parm
->db
.iptrgcls
= msg
->class;
1129 parm
->db
.ipflags1
= (flags
| IUCV_IPFGPID
|
1130 IUCV_IPFGMID
| IUCV_IPTRGCLS
);
1131 rc
= iucv_call_b2f0(IUCV_RECEIVE
, parm
);
1132 if (!rc
|| rc
== 5) {
1133 msg
->flags
= parm
->db
.ipflags1
;
1135 *residual
= parm
->db
.ipbfln1f
;
1139 EXPORT_SYMBOL(__iucv_message_receive
);
1142 * iucv_message_receive
1143 * @path: address of iucv path structure
1144 * @msg: address of iucv msg structure
1145 * @flags: how the message is received (IUCV_IPBUFLST)
1146 * @buffer: address of data buffer or address of struct iucv_array
1147 * @size: length of data buffer
1150 * This function receives messages that are being sent to you over
1151 * established paths. This function will deal with RMDATA messages
1152 * embedded in struct iucv_message as well.
1154 * Locking: local_bh_enable/local_bh_disable
1156 * Returns the result from the CP IUCV call.
1158 int iucv_message_receive(struct iucv_path
*path
, struct iucv_message
*msg
,
1159 u8 flags
, void *buffer
, size_t size
, size_t *residual
)
1163 if (msg
->flags
& IUCV_IPRMDATA
)
1164 return iucv_message_receive_iprmdata(path
, msg
, flags
,
1165 buffer
, size
, residual
);
1167 rc
= __iucv_message_receive(path
, msg
, flags
, buffer
, size
, residual
);
1171 EXPORT_SYMBOL(iucv_message_receive
);
1174 * iucv_message_reject
1175 * @path: address of iucv path structure
1176 * @msg: address of iucv msg structure
1178 * The reject function refuses a specified message. Between the time you
1179 * are notified of a message and the time that you complete the message,
1180 * the message may be rejected.
1182 * Returns the result from the CP IUCV call.
1184 int iucv_message_reject(struct iucv_path
*path
, struct iucv_message
*msg
)
1186 union iucv_param
*parm
;
1190 if (cpumask_empty(&iucv_buffer_cpumask
)) {
1194 parm
= iucv_param
[smp_processor_id()];
1195 memset(parm
, 0, sizeof(union iucv_param
));
1196 parm
->db
.ippathid
= path
->pathid
;
1197 parm
->db
.ipmsgid
= msg
->id
;
1198 parm
->db
.iptrgcls
= msg
->class;
1199 parm
->db
.ipflags1
= (IUCV_IPTRGCLS
| IUCV_IPFGMID
| IUCV_IPFGPID
);
1200 rc
= iucv_call_b2f0(IUCV_REJECT
, parm
);
1205 EXPORT_SYMBOL(iucv_message_reject
);
1208 * iucv_message_reply
1209 * @path: address of iucv path structure
1210 * @msg: address of iucv msg structure
1211 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1212 * @reply: address of reply data buffer or address of struct iucv_array
1213 * @size: length of reply data buffer
1215 * This function responds to the two-way messages that you receive. You
1216 * must identify completely the message to which you wish to reply. ie,
1217 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1218 * the parameter list.
1220 * Returns the result from the CP IUCV call.
1222 int iucv_message_reply(struct iucv_path
*path
, struct iucv_message
*msg
,
1223 u8 flags
, void *reply
, size_t size
)
1225 union iucv_param
*parm
;
1229 if (cpumask_empty(&iucv_buffer_cpumask
)) {
1233 parm
= iucv_param
[smp_processor_id()];
1234 memset(parm
, 0, sizeof(union iucv_param
));
1235 if (flags
& IUCV_IPRMDATA
) {
1236 parm
->dpl
.ippathid
= path
->pathid
;
1237 parm
->dpl
.ipflags1
= flags
;
1238 parm
->dpl
.ipmsgid
= msg
->id
;
1239 parm
->dpl
.iptrgcls
= msg
->class;
1240 memcpy(parm
->dpl
.iprmmsg
, reply
, min_t(size_t, size
, 8));
1242 parm
->db
.ipbfadr1
= (u32
)(addr_t
) reply
;
1243 parm
->db
.ipbfln1f
= (u32
) size
;
1244 parm
->db
.ippathid
= path
->pathid
;
1245 parm
->db
.ipflags1
= flags
;
1246 parm
->db
.ipmsgid
= msg
->id
;
1247 parm
->db
.iptrgcls
= msg
->class;
1249 rc
= iucv_call_b2f0(IUCV_REPLY
, parm
);
1254 EXPORT_SYMBOL(iucv_message_reply
);
1257 * __iucv_message_send
1258 * @path: address of iucv path structure
1259 * @msg: address of iucv msg structure
1260 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1261 * @srccls: source class of message
1262 * @buffer: address of send buffer or address of struct iucv_array
1263 * @size: length of send buffer
1265 * This function transmits data to another application. Data to be
1266 * transmitted is in a buffer and this is a one-way message and the
1267 * receiver will not reply to the message.
1269 * Locking: no locking
1271 * Returns the result from the CP IUCV call.
1273 int __iucv_message_send(struct iucv_path
*path
, struct iucv_message
*msg
,
1274 u8 flags
, u32 srccls
, void *buffer
, size_t size
)
1276 union iucv_param
*parm
;
1279 if (cpumask_empty(&iucv_buffer_cpumask
)) {
1283 parm
= iucv_param
[smp_processor_id()];
1284 memset(parm
, 0, sizeof(union iucv_param
));
1285 if (flags
& IUCV_IPRMDATA
) {
1286 /* Message of 8 bytes can be placed into the parameter list. */
1287 parm
->dpl
.ippathid
= path
->pathid
;
1288 parm
->dpl
.ipflags1
= flags
| IUCV_IPNORPY
;
1289 parm
->dpl
.iptrgcls
= msg
->class;
1290 parm
->dpl
.ipsrccls
= srccls
;
1291 parm
->dpl
.ipmsgtag
= msg
->tag
;
1292 memcpy(parm
->dpl
.iprmmsg
, buffer
, 8);
1294 parm
->db
.ipbfadr1
= (u32
)(addr_t
) buffer
;
1295 parm
->db
.ipbfln1f
= (u32
) size
;
1296 parm
->db
.ippathid
= path
->pathid
;
1297 parm
->db
.ipflags1
= flags
| IUCV_IPNORPY
;
1298 parm
->db
.iptrgcls
= msg
->class;
1299 parm
->db
.ipsrccls
= srccls
;
1300 parm
->db
.ipmsgtag
= msg
->tag
;
1302 rc
= iucv_call_b2f0(IUCV_SEND
, parm
);
1304 msg
->id
= parm
->db
.ipmsgid
;
1308 EXPORT_SYMBOL(__iucv_message_send
);
1312 * @path: address of iucv path structure
1313 * @msg: address of iucv msg structure
1314 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1315 * @srccls: source class of message
1316 * @buffer: address of send buffer or address of struct iucv_array
1317 * @size: length of send buffer
1319 * This function transmits data to another application. Data to be
1320 * transmitted is in a buffer and this is a one-way message and the
1321 * receiver will not reply to the message.
1323 * Locking: local_bh_enable/local_bh_disable
1325 * Returns the result from the CP IUCV call.
1327 int iucv_message_send(struct iucv_path
*path
, struct iucv_message
*msg
,
1328 u8 flags
, u32 srccls
, void *buffer
, size_t size
)
1333 rc
= __iucv_message_send(path
, msg
, flags
, srccls
, buffer
, size
);
1337 EXPORT_SYMBOL(iucv_message_send
);
1340 * iucv_message_send2way
1341 * @path: address of iucv path structure
1342 * @msg: address of iucv msg structure
1343 * @flags: how the message is sent and the reply is received
1344 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1345 * @srccls: source class of message
1346 * @buffer: address of send buffer or address of struct iucv_array
1347 * @size: length of send buffer
1348 * @ansbuf: address of answer buffer or address of struct iucv_array
1349 * @asize: size of reply buffer
1351 * This function transmits data to another application. Data to be
1352 * transmitted is in a buffer. The receiver of the send is expected to
1353 * reply to the message and a buffer is provided into which IUCV moves
1354 * the reply to this message.
1356 * Returns the result from the CP IUCV call.
1358 int iucv_message_send2way(struct iucv_path
*path
, struct iucv_message
*msg
,
1359 u8 flags
, u32 srccls
, void *buffer
, size_t size
,
1360 void *answer
, size_t asize
, size_t *residual
)
1362 union iucv_param
*parm
;
1366 if (cpumask_empty(&iucv_buffer_cpumask
)) {
1370 parm
= iucv_param
[smp_processor_id()];
1371 memset(parm
, 0, sizeof(union iucv_param
));
1372 if (flags
& IUCV_IPRMDATA
) {
1373 parm
->dpl
.ippathid
= path
->pathid
;
1374 parm
->dpl
.ipflags1
= path
->flags
; /* priority message */
1375 parm
->dpl
.iptrgcls
= msg
->class;
1376 parm
->dpl
.ipsrccls
= srccls
;
1377 parm
->dpl
.ipmsgtag
= msg
->tag
;
1378 parm
->dpl
.ipbfadr2
= (u32
)(addr_t
) answer
;
1379 parm
->dpl
.ipbfln2f
= (u32
) asize
;
1380 memcpy(parm
->dpl
.iprmmsg
, buffer
, 8);
1382 parm
->db
.ippathid
= path
->pathid
;
1383 parm
->db
.ipflags1
= path
->flags
; /* priority message */
1384 parm
->db
.iptrgcls
= msg
->class;
1385 parm
->db
.ipsrccls
= srccls
;
1386 parm
->db
.ipmsgtag
= msg
->tag
;
1387 parm
->db
.ipbfadr1
= (u32
)(addr_t
) buffer
;
1388 parm
->db
.ipbfln1f
= (u32
) size
;
1389 parm
->db
.ipbfadr2
= (u32
)(addr_t
) answer
;
1390 parm
->db
.ipbfln2f
= (u32
) asize
;
1392 rc
= iucv_call_b2f0(IUCV_SEND
, parm
);
1394 msg
->id
= parm
->db
.ipmsgid
;
1399 EXPORT_SYMBOL(iucv_message_send2way
);
1403 * @data: Pointer to external interrupt buffer
1405 * Process connection pending work item. Called from tasklet while holding
1408 struct iucv_path_pending
{
1421 static void iucv_path_pending(struct iucv_irq_data
*data
)
1423 struct iucv_path_pending
*ipp
= (void *) data
;
1424 struct iucv_handler
*handler
;
1425 struct iucv_path
*path
;
1428 BUG_ON(iucv_path_table
[ipp
->ippathid
]);
1429 /* New pathid, handler found. Create a new path struct. */
1430 error
= iucv_error_no_memory
;
1431 path
= iucv_path_alloc(ipp
->ipmsglim
, ipp
->ipflags1
, GFP_ATOMIC
);
1434 path
->pathid
= ipp
->ippathid
;
1435 iucv_path_table
[path
->pathid
] = path
;
1436 EBCASC(ipp
->ipvmid
, 8);
1438 /* Call registered handler until one is found that wants the path. */
1439 list_for_each_entry(handler
, &iucv_handler_list
, list
) {
1440 if (!handler
->path_pending
)
1443 * Add path to handler to allow a call to iucv_path_sever
1444 * inside the path_pending function. If the handler returns
1445 * an error remove the path from the handler again.
1447 list_add(&path
->list
, &handler
->paths
);
1448 path
->handler
= handler
;
1449 if (!handler
->path_pending(path
, ipp
->ipvmid
, ipp
->ipuser
))
1451 list_del(&path
->list
);
1452 path
->handler
= NULL
;
1454 /* No handler wanted the path. */
1455 iucv_path_table
[path
->pathid
] = NULL
;
1456 iucv_path_free(path
);
1457 error
= iucv_error_no_listener
;
1459 iucv_sever_pathid(ipp
->ippathid
, error
);
1463 * iucv_path_complete
1464 * @data: Pointer to external interrupt buffer
1466 * Process connection complete work item. Called from tasklet while holding
1469 struct iucv_path_complete
{
1482 static void iucv_path_complete(struct iucv_irq_data
*data
)
1484 struct iucv_path_complete
*ipc
= (void *) data
;
1485 struct iucv_path
*path
= iucv_path_table
[ipc
->ippathid
];
1488 path
->flags
= ipc
->ipflags1
;
1489 if (path
&& path
->handler
&& path
->handler
->path_complete
)
1490 path
->handler
->path_complete(path
, ipc
->ipuser
);
1495 * @data: Pointer to external interrupt buffer
1497 * Process connection severed work item. Called from tasklet while holding
1500 struct iucv_path_severed
{
1512 static void iucv_path_severed(struct iucv_irq_data
*data
)
1514 struct iucv_path_severed
*ips
= (void *) data
;
1515 struct iucv_path
*path
= iucv_path_table
[ips
->ippathid
];
1517 if (!path
|| !path
->handler
) /* Already severed */
1519 if (path
->handler
->path_severed
)
1520 path
->handler
->path_severed(path
, ips
->ipuser
);
1522 iucv_sever_pathid(path
->pathid
, NULL
);
1523 iucv_path_table
[path
->pathid
] = NULL
;
1524 list_del(&path
->list
);
1525 iucv_path_free(path
);
1530 * iucv_path_quiesced
1531 * @data: Pointer to external interrupt buffer
1533 * Process connection quiesced work item. Called from tasklet while holding
1536 struct iucv_path_quiesced
{
1548 static void iucv_path_quiesced(struct iucv_irq_data
*data
)
1550 struct iucv_path_quiesced
*ipq
= (void *) data
;
1551 struct iucv_path
*path
= iucv_path_table
[ipq
->ippathid
];
1553 if (path
&& path
->handler
&& path
->handler
->path_quiesced
)
1554 path
->handler
->path_quiesced(path
, ipq
->ipuser
);
1559 * @data: Pointer to external interrupt buffer
1561 * Process connection resumed work item. Called from tasklet while holding
1564 struct iucv_path_resumed
{
1576 static void iucv_path_resumed(struct iucv_irq_data
*data
)
1578 struct iucv_path_resumed
*ipr
= (void *) data
;
1579 struct iucv_path
*path
= iucv_path_table
[ipr
->ippathid
];
1581 if (path
&& path
->handler
&& path
->handler
->path_resumed
)
1582 path
->handler
->path_resumed(path
, ipr
->ipuser
);
1586 * iucv_message_complete
1587 * @data: Pointer to external interrupt buffer
1589 * Process message complete work item. Called from tasklet while holding
1592 struct iucv_message_complete
{
1607 static void iucv_message_complete(struct iucv_irq_data
*data
)
1609 struct iucv_message_complete
*imc
= (void *) data
;
1610 struct iucv_path
*path
= iucv_path_table
[imc
->ippathid
];
1611 struct iucv_message msg
;
1613 if (path
&& path
->handler
&& path
->handler
->message_complete
) {
1614 msg
.flags
= imc
->ipflags1
;
1615 msg
.id
= imc
->ipmsgid
;
1616 msg
.audit
= imc
->ipaudit
;
1617 memcpy(msg
.rmmsg
, imc
->iprmmsg
, 8);
1618 msg
.class = imc
->ipsrccls
;
1619 msg
.tag
= imc
->ipmsgtag
;
1620 msg
.length
= imc
->ipbfln2f
;
1621 path
->handler
->message_complete(path
, &msg
);
1626 * iucv_message_pending
1627 * @data: Pointer to external interrupt buffer
1629 * Process message pending work item. Called from tasklet while holding
1632 struct iucv_message_pending
{
1652 static void iucv_message_pending(struct iucv_irq_data
*data
)
1654 struct iucv_message_pending
*imp
= (void *) data
;
1655 struct iucv_path
*path
= iucv_path_table
[imp
->ippathid
];
1656 struct iucv_message msg
;
1658 if (path
&& path
->handler
&& path
->handler
->message_pending
) {
1659 msg
.flags
= imp
->ipflags1
;
1660 msg
.id
= imp
->ipmsgid
;
1661 msg
.class = imp
->iptrgcls
;
1662 if (imp
->ipflags1
& IUCV_IPRMDATA
) {
1663 memcpy(msg
.rmmsg
, imp
->ln1msg1
.iprmmsg1
, 8);
1666 msg
.length
= imp
->ln1msg2
.ipbfln1f
;
1667 msg
.reply_size
= imp
->ipbfln2f
;
1668 path
->handler
->message_pending(path
, &msg
);
1675 * This tasklet loops over the queue of irq buffers created by
1676 * iucv_external_interrupt, calls the appropriate action handler
1677 * and then frees the buffer.
1679 static void iucv_tasklet_fn(unsigned long ignored
)
1681 typedef void iucv_irq_fn(struct iucv_irq_data
*);
1682 static iucv_irq_fn
*irq_fn
[] = {
1683 [0x02] = iucv_path_complete
,
1684 [0x03] = iucv_path_severed
,
1685 [0x04] = iucv_path_quiesced
,
1686 [0x05] = iucv_path_resumed
,
1687 [0x06] = iucv_message_complete
,
1688 [0x07] = iucv_message_complete
,
1689 [0x08] = iucv_message_pending
,
1690 [0x09] = iucv_message_pending
,
1692 LIST_HEAD(task_queue
);
1693 struct iucv_irq_list
*p
, *n
;
1695 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1696 if (!spin_trylock(&iucv_table_lock
)) {
1697 tasklet_schedule(&iucv_tasklet
);
1700 iucv_active_cpu
= smp_processor_id();
1702 spin_lock_irq(&iucv_queue_lock
);
1703 list_splice_init(&iucv_task_queue
, &task_queue
);
1704 spin_unlock_irq(&iucv_queue_lock
);
1706 list_for_each_entry_safe(p
, n
, &task_queue
, list
) {
1707 list_del_init(&p
->list
);
1708 irq_fn
[p
->data
.iptype
](&p
->data
);
1712 iucv_active_cpu
= -1;
1713 spin_unlock(&iucv_table_lock
);
1719 * This work function loops over the queue of path pending irq blocks
1720 * created by iucv_external_interrupt, calls the appropriate action
1721 * handler and then frees the buffer.
1723 static void iucv_work_fn(struct work_struct
*work
)
1725 LIST_HEAD(work_queue
);
1726 struct iucv_irq_list
*p
, *n
;
1728 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1729 spin_lock_bh(&iucv_table_lock
);
1730 iucv_active_cpu
= smp_processor_id();
1732 spin_lock_irq(&iucv_queue_lock
);
1733 list_splice_init(&iucv_work_queue
, &work_queue
);
1734 spin_unlock_irq(&iucv_queue_lock
);
1736 iucv_cleanup_queue();
1737 list_for_each_entry_safe(p
, n
, &work_queue
, list
) {
1738 list_del_init(&p
->list
);
1739 iucv_path_pending(&p
->data
);
1743 iucv_active_cpu
= -1;
1744 spin_unlock_bh(&iucv_table_lock
);
1748 * iucv_external_interrupt
1751 * Handles external interrupts coming in from CP.
1752 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1754 static void iucv_external_interrupt(struct ext_code ext_code
,
1755 unsigned int param32
, unsigned long param64
)
1757 struct iucv_irq_data
*p
;
1758 struct iucv_irq_list
*work
;
1760 inc_irq_stat(IRQEXT_IUC
);
1761 p
= iucv_irq_data
[smp_processor_id()];
1762 if (p
->ippathid
>= iucv_max_pathid
) {
1763 WARN_ON(p
->ippathid
>= iucv_max_pathid
);
1764 iucv_sever_pathid(p
->ippathid
, iucv_error_no_listener
);
1767 BUG_ON(p
->iptype
< 0x01 || p
->iptype
> 0x09);
1768 work
= kmalloc(sizeof(struct iucv_irq_list
), GFP_ATOMIC
);
1770 pr_warn("iucv_external_interrupt: out of memory\n");
1773 memcpy(&work
->data
, p
, sizeof(work
->data
));
1774 spin_lock(&iucv_queue_lock
);
1775 if (p
->iptype
== 0x01) {
1776 /* Path pending interrupt. */
1777 list_add_tail(&work
->list
, &iucv_work_queue
);
1778 schedule_work(&iucv_work
);
1780 /* The other interrupts. */
1781 list_add_tail(&work
->list
, &iucv_task_queue
);
1782 tasklet_schedule(&iucv_tasklet
);
1784 spin_unlock(&iucv_queue_lock
);
1787 struct iucv_interface iucv_if
= {
1788 .message_receive
= iucv_message_receive
,
1789 .__message_receive
= __iucv_message_receive
,
1790 .message_reply
= iucv_message_reply
,
1791 .message_reject
= iucv_message_reject
,
1792 .message_send
= iucv_message_send
,
1793 .__message_send
= __iucv_message_send
,
1794 .message_send2way
= iucv_message_send2way
,
1795 .message_purge
= iucv_message_purge
,
1796 .path_accept
= iucv_path_accept
,
1797 .path_connect
= iucv_path_connect
,
1798 .path_quiesce
= iucv_path_quiesce
,
1799 .path_resume
= iucv_path_resume
,
1800 .path_sever
= iucv_path_sever
,
1801 .iucv_register
= iucv_register
,
1802 .iucv_unregister
= iucv_unregister
,
1806 EXPORT_SYMBOL(iucv_if
);
1808 static enum cpuhp_state iucv_online
;
1812 * Allocates and initializes various data structures.
1814 static int __init
iucv_init(void)
1818 if (!MACHINE_IS_VM
) {
1819 rc
= -EPROTONOSUPPORT
;
1823 rc
= iucv_query_maxconn();
1826 rc
= register_external_irq(EXT_IRQ_IUCV
, iucv_external_interrupt
);
1829 iucv_root
= root_device_register("iucv");
1830 if (IS_ERR(iucv_root
)) {
1831 rc
= PTR_ERR(iucv_root
);
1835 rc
= cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE
, "net/iucv:prepare",
1836 iucv_cpu_prepare
, iucv_cpu_dead
);
1839 rc
= cpuhp_setup_state(CPUHP_AP_ONLINE_DYN
, "net/iucv:online",
1840 iucv_cpu_online
, iucv_cpu_down_prep
);
1845 rc
= register_reboot_notifier(&iucv_reboot_notifier
);
1848 ASCEBC(iucv_error_no_listener
, 16);
1849 ASCEBC(iucv_error_no_memory
, 16);
1850 ASCEBC(iucv_error_pathid
, 16);
1852 rc
= bus_register(&iucv_bus
);
1855 iucv_if
.root
= iucv_root
;
1856 iucv_if
.bus
= &iucv_bus
;
1860 unregister_reboot_notifier(&iucv_reboot_notifier
);
1862 cpuhp_remove_state(iucv_online
);
1864 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE
);
1866 root_device_unregister(iucv_root
);
1868 unregister_external_irq(EXT_IRQ_IUCV
, iucv_external_interrupt
);
1870 ctl_clear_bit(0, 1);
1878 * Frees everything allocated from iucv_init.
1880 static void __exit
iucv_exit(void)
1882 struct iucv_irq_list
*p
, *n
;
1884 spin_lock_irq(&iucv_queue_lock
);
1885 list_for_each_entry_safe(p
, n
, &iucv_task_queue
, list
)
1887 list_for_each_entry_safe(p
, n
, &iucv_work_queue
, list
)
1889 spin_unlock_irq(&iucv_queue_lock
);
1890 unregister_reboot_notifier(&iucv_reboot_notifier
);
1892 cpuhp_remove_state_nocalls(iucv_online
);
1893 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE
);
1894 root_device_unregister(iucv_root
);
1895 bus_unregister(&iucv_bus
);
1896 unregister_external_irq(EXT_IRQ_IUCV
, iucv_external_interrupt
);
1899 subsys_initcall(iucv_init
);
1900 module_exit(iucv_exit
);
1902 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1903 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1904 MODULE_LICENSE("GPL");