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 const 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: array of pointers to 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 * @command: 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 unsigned long reg1
= virt_to_phys(parm
);
295 " .long 0xb2f01000\n"
298 : [cc
] "=&d" (cc
), "+m" (*parm
)
299 : [reg0
] "d" ((unsigned long)command
),
305 static inline int iucv_call_b2f0(int command
, union iucv_param
*parm
)
309 ccode
= __iucv_call_b2f0(command
, parm
);
310 return ccode
== 1 ? parm
->ctrl
.iprcode
: ccode
;
316 * Determines the maximum number of connections that may be established.
318 * Returns the maximum number of connections or -EPERM is IUCV is not
321 static int __iucv_query_maxconn(void *param
, unsigned long *max_pathid
)
323 unsigned long reg1
= virt_to_phys(param
);
329 " .long 0xb2f01000\n"
333 : [cc
] "=&d" (cc
), [reg1
] "+&d" (reg1
)
334 : [cmd
] "K" (IUCV_QUERY
)
340 static int iucv_query_maxconn(void)
342 unsigned long max_pathid
;
346 param
= kzalloc(sizeof(union iucv_param
), GFP_KERNEL
| GFP_DMA
);
349 ccode
= __iucv_query_maxconn(param
, &max_pathid
);
351 iucv_max_pathid
= max_pathid
;
353 return ccode
? -EPERM
: 0;
360 * Allow iucv interrupts on this cpu.
362 static void iucv_allow_cpu(void *data
)
364 int cpu
= smp_processor_id();
365 union iucv_param
*parm
;
368 * Enable all iucv interrupts.
369 * ipmask contains bits for the different interrupts
370 * 0x80 - Flag to allow nonpriority message pending interrupts
371 * 0x40 - Flag to allow priority message pending interrupts
372 * 0x20 - Flag to allow nonpriority message completion interrupts
373 * 0x10 - Flag to allow priority message completion interrupts
374 * 0x08 - Flag to allow IUCV control interrupts
376 parm
= iucv_param_irq
[cpu
];
377 memset(parm
, 0, sizeof(union iucv_param
));
378 parm
->set_mask
.ipmask
= 0xf8;
379 iucv_call_b2f0(IUCV_SETMASK
, parm
);
382 * Enable all iucv control interrupts.
383 * ipmask contains bits for the different interrupts
384 * 0x80 - Flag to allow pending connections interrupts
385 * 0x40 - Flag to allow connection complete interrupts
386 * 0x20 - Flag to allow connection severed interrupts
387 * 0x10 - Flag to allow connection quiesced interrupts
388 * 0x08 - Flag to allow connection resumed interrupts
390 memset(parm
, 0, sizeof(union iucv_param
));
391 parm
->set_mask
.ipmask
= 0xf8;
392 iucv_call_b2f0(IUCV_SETCONTROLMASK
, parm
);
393 /* Set indication that iucv interrupts are allowed for this cpu. */
394 cpumask_set_cpu(cpu
, &iucv_irq_cpumask
);
401 * Block iucv interrupts on this cpu.
403 static void iucv_block_cpu(void *data
)
405 int cpu
= smp_processor_id();
406 union iucv_param
*parm
;
408 /* Disable all iucv interrupts. */
409 parm
= iucv_param_irq
[cpu
];
410 memset(parm
, 0, sizeof(union iucv_param
));
411 iucv_call_b2f0(IUCV_SETMASK
, parm
);
413 /* Clear indication that iucv interrupts are allowed for this cpu. */
414 cpumask_clear_cpu(cpu
, &iucv_irq_cpumask
);
421 * Declare a interrupt buffer on this cpu.
423 static void iucv_declare_cpu(void *data
)
425 int cpu
= smp_processor_id();
426 union iucv_param
*parm
;
429 if (cpumask_test_cpu(cpu
, &iucv_buffer_cpumask
))
432 /* Declare interrupt buffer. */
433 parm
= iucv_param_irq
[cpu
];
434 memset(parm
, 0, sizeof(union iucv_param
));
435 parm
->db
.ipbfadr1
= virt_to_phys(iucv_irq_data
[cpu
]);
436 rc
= iucv_call_b2f0(IUCV_DECLARE_BUFFER
, parm
);
438 char *err
= "Unknown";
441 err
= "Directory error";
444 err
= "Invalid length";
447 err
= "Buffer already exists";
450 err
= "Buffer overlap";
453 err
= "Paging or storage error";
456 pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n",
461 /* Set indication that an iucv buffer exists for this cpu. */
462 cpumask_set_cpu(cpu
, &iucv_buffer_cpumask
);
464 if (iucv_nonsmp_handler
== 0 || cpumask_empty(&iucv_irq_cpumask
))
465 /* Enable iucv interrupts on this cpu. */
466 iucv_allow_cpu(NULL
);
468 /* Disable iucv interrupts on this cpu. */
469 iucv_block_cpu(NULL
);
476 * Retrieve interrupt buffer on this cpu.
478 static void iucv_retrieve_cpu(void *data
)
480 int cpu
= smp_processor_id();
481 union iucv_param
*parm
;
483 if (!cpumask_test_cpu(cpu
, &iucv_buffer_cpumask
))
486 /* Block iucv interrupts. */
487 iucv_block_cpu(NULL
);
489 /* Retrieve interrupt buffer. */
490 parm
= iucv_param_irq
[cpu
];
491 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER
, parm
);
493 /* Clear indication that an iucv buffer exists for this cpu. */
494 cpumask_clear_cpu(cpu
, &iucv_buffer_cpumask
);
500 * Allow iucv interrupts on all cpus.
502 static void iucv_setmask_mp(void)
507 for_each_online_cpu(cpu
)
508 /* Enable all cpus with a declared buffer. */
509 if (cpumask_test_cpu(cpu
, &iucv_buffer_cpumask
) &&
510 !cpumask_test_cpu(cpu
, &iucv_irq_cpumask
))
511 smp_call_function_single(cpu
, iucv_allow_cpu
,
519 * Allow iucv interrupts on a single cpu.
521 static void iucv_setmask_up(void)
526 /* Disable all cpu but the first in cpu_irq_cpumask. */
527 cpumask_copy(&cpumask
, &iucv_irq_cpumask
);
528 cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask
), &cpumask
);
529 for_each_cpu(cpu
, &cpumask
)
530 smp_call_function_single(cpu
, iucv_block_cpu
, NULL
, 1);
536 * This function makes iucv ready for use. It allocates the pathid
537 * table, declares an iucv interrupt buffer and enables the iucv
538 * interrupts. Called when the first user has registered an iucv
541 static int iucv_enable(void)
548 alloc_size
= iucv_max_pathid
* sizeof(*iucv_path_table
);
549 iucv_path_table
= kzalloc(alloc_size
, GFP_KERNEL
);
550 if (!iucv_path_table
)
552 /* Declare per cpu buffers. */
554 for_each_online_cpu(cpu
)
555 smp_call_function_single(cpu
, iucv_declare_cpu
, NULL
, 1);
556 if (cpumask_empty(&iucv_buffer_cpumask
))
557 /* No cpu could declare an iucv buffer. */
562 kfree(iucv_path_table
);
563 iucv_path_table
= NULL
;
571 * This function shuts down iucv. It disables iucv interrupts, retrieves
572 * the iucv interrupt buffer and frees the pathid table. Called after the
573 * last user unregister its iucv handler.
575 static void iucv_disable(void)
578 on_each_cpu(iucv_retrieve_cpu
, NULL
, 1);
579 kfree(iucv_path_table
);
580 iucv_path_table
= NULL
;
584 static int iucv_cpu_dead(unsigned int cpu
)
586 kfree(iucv_param_irq
[cpu
]);
587 iucv_param_irq
[cpu
] = NULL
;
588 kfree(iucv_param
[cpu
]);
589 iucv_param
[cpu
] = NULL
;
590 kfree(iucv_irq_data
[cpu
]);
591 iucv_irq_data
[cpu
] = NULL
;
595 static int iucv_cpu_prepare(unsigned int cpu
)
597 /* Note: GFP_DMA used to get memory below 2G */
598 iucv_irq_data
[cpu
] = kmalloc_node(sizeof(struct iucv_irq_data
),
599 GFP_KERNEL
|GFP_DMA
, cpu_to_node(cpu
));
600 if (!iucv_irq_data
[cpu
])
603 /* Allocate parameter blocks. */
604 iucv_param
[cpu
] = kmalloc_node(sizeof(union iucv_param
),
605 GFP_KERNEL
|GFP_DMA
, cpu_to_node(cpu
));
606 if (!iucv_param
[cpu
])
609 iucv_param_irq
[cpu
] = kmalloc_node(sizeof(union iucv_param
),
610 GFP_KERNEL
|GFP_DMA
, cpu_to_node(cpu
));
611 if (!iucv_param_irq
[cpu
])
621 static int iucv_cpu_online(unsigned int cpu
)
623 if (!iucv_path_table
)
625 iucv_declare_cpu(NULL
);
629 static int iucv_cpu_down_prep(unsigned int cpu
)
633 if (!iucv_path_table
)
636 cpumask_copy(&cpumask
, &iucv_buffer_cpumask
);
637 cpumask_clear_cpu(cpu
, &cpumask
);
638 if (cpumask_empty(&cpumask
))
639 /* Can't offline last IUCV enabled cpu. */
642 iucv_retrieve_cpu(NULL
);
643 if (!cpumask_empty(&iucv_irq_cpumask
))
645 smp_call_function_single(cpumask_first(&iucv_buffer_cpumask
),
646 iucv_allow_cpu
, NULL
, 1);
652 * @pathid: path identification number.
653 * @userdata: 16-bytes of user data.
655 * Sever an iucv path to free up the pathid. Used internally.
657 static int iucv_sever_pathid(u16 pathid
, u8
*userdata
)
659 union iucv_param
*parm
;
661 parm
= iucv_param_irq
[smp_processor_id()];
662 memset(parm
, 0, sizeof(union iucv_param
));
664 memcpy(parm
->ctrl
.ipuser
, userdata
, sizeof(parm
->ctrl
.ipuser
));
665 parm
->ctrl
.ippathid
= pathid
;
666 return iucv_call_b2f0(IUCV_SEVER
, parm
);
670 * __iucv_cleanup_queue
671 * @dummy: unused dummy argument
673 * Nop function called via smp_call_function to force work items from
674 * pending external iucv interrupts to the work queue.
676 static void __iucv_cleanup_queue(void *dummy
)
683 * Function called after a path has been severed to find all remaining
684 * work items for the now stale pathid. The caller needs to hold the
687 static void iucv_cleanup_queue(void)
689 struct iucv_irq_list
*p
, *n
;
692 * When a path is severed, the pathid can be reused immediately
693 * on a iucv connect or a connection pending interrupt. Remove
694 * all entries from the task queue that refer to a stale pathid
695 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
696 * or deliver the connection pending interrupt. To get all the
697 * pending interrupts force them to the work queue by calling
698 * an empty function on all cpus.
700 smp_call_function(__iucv_cleanup_queue
, NULL
, 1);
701 spin_lock_irq(&iucv_queue_lock
);
702 list_for_each_entry_safe(p
, n
, &iucv_task_queue
, list
) {
703 /* Remove stale work items from the task queue. */
704 if (iucv_path_table
[p
->data
.ippathid
] == NULL
) {
709 spin_unlock_irq(&iucv_queue_lock
);
714 * @handler: address of iucv handler structure
715 * @smp: != 0 indicates that the handler can deal with out of order messages
717 * Registers a driver with IUCV.
719 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
720 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
722 int iucv_register(struct iucv_handler
*handler
, int smp
)
728 mutex_lock(&iucv_register_mutex
);
730 iucv_nonsmp_handler
++;
731 if (list_empty(&iucv_handler_list
)) {
735 } else if (!smp
&& iucv_nonsmp_handler
== 1)
737 INIT_LIST_HEAD(&handler
->paths
);
739 spin_lock_bh(&iucv_table_lock
);
740 list_add_tail(&handler
->list
, &iucv_handler_list
);
741 spin_unlock_bh(&iucv_table_lock
);
744 mutex_unlock(&iucv_register_mutex
);
747 EXPORT_SYMBOL(iucv_register
);
751 * @handler: address of iucv handler structure
752 * @smp: != 0 indicates that the handler can deal with out of order messages
754 * Unregister driver from IUCV.
756 void iucv_unregister(struct iucv_handler
*handler
, int smp
)
758 struct iucv_path
*p
, *n
;
760 mutex_lock(&iucv_register_mutex
);
761 spin_lock_bh(&iucv_table_lock
);
762 /* Remove handler from the iucv_handler_list. */
763 list_del_init(&handler
->list
);
764 /* Sever all pathids still referring to the handler. */
765 list_for_each_entry_safe(p
, n
, &handler
->paths
, list
) {
766 iucv_sever_pathid(p
->pathid
, NULL
);
767 iucv_path_table
[p
->pathid
] = NULL
;
771 spin_unlock_bh(&iucv_table_lock
);
773 iucv_nonsmp_handler
--;
774 if (list_empty(&iucv_handler_list
))
776 else if (!smp
&& iucv_nonsmp_handler
== 0)
778 mutex_unlock(&iucv_register_mutex
);
780 EXPORT_SYMBOL(iucv_unregister
);
782 static int iucv_reboot_event(struct notifier_block
*this,
783 unsigned long event
, void *ptr
)
787 if (cpumask_empty(&iucv_irq_cpumask
))
791 on_each_cpu_mask(&iucv_irq_cpumask
, iucv_block_cpu
, NULL
, 1);
793 for (i
= 0; i
< iucv_max_pathid
; i
++) {
794 if (iucv_path_table
[i
])
795 iucv_sever_pathid(i
, NULL
);
803 static struct notifier_block iucv_reboot_notifier
= {
804 .notifier_call
= iucv_reboot_event
,
809 * @path: address of iucv path structure
810 * @handler: address of iucv handler structure
811 * @userdata: 16 bytes of data reflected to the communication partner
812 * @private: private data passed to interrupt handlers for this path
814 * This function is issued after the user received a connection pending
815 * external interrupt and now wishes to complete the IUCV communication path.
817 * Returns the result of the CP IUCV call.
819 int iucv_path_accept(struct iucv_path
*path
, struct iucv_handler
*handler
,
820 u8
*userdata
, void *private)
822 union iucv_param
*parm
;
826 if (cpumask_empty(&iucv_buffer_cpumask
)) {
830 /* Prepare parameter block. */
831 parm
= iucv_param
[smp_processor_id()];
832 memset(parm
, 0, sizeof(union iucv_param
));
833 parm
->ctrl
.ippathid
= path
->pathid
;
834 parm
->ctrl
.ipmsglim
= path
->msglim
;
836 memcpy(parm
->ctrl
.ipuser
, userdata
, sizeof(parm
->ctrl
.ipuser
));
837 parm
->ctrl
.ipflags1
= path
->flags
;
839 rc
= iucv_call_b2f0(IUCV_ACCEPT
, parm
);
841 path
->private = private;
842 path
->msglim
= parm
->ctrl
.ipmsglim
;
843 path
->flags
= parm
->ctrl
.ipflags1
;
849 EXPORT_SYMBOL(iucv_path_accept
);
853 * @path: address of iucv path structure
854 * @handler: address of iucv handler structure
855 * @userid: 8-byte user identification
856 * @system: 8-byte target system identification
857 * @userdata: 16 bytes of data reflected to the communication partner
858 * @private: private data passed to interrupt handlers for this path
860 * This function establishes an IUCV path. Although the connect may complete
861 * successfully, you are not able to use the path until you receive an IUCV
862 * Connection Complete external interrupt.
864 * Returns the result of the CP IUCV call.
866 int iucv_path_connect(struct iucv_path
*path
, struct iucv_handler
*handler
,
867 u8
*userid
, u8
*system
, u8
*userdata
,
870 union iucv_param
*parm
;
873 spin_lock_bh(&iucv_table_lock
);
874 iucv_cleanup_queue();
875 if (cpumask_empty(&iucv_buffer_cpumask
)) {
879 parm
= iucv_param
[smp_processor_id()];
880 memset(parm
, 0, sizeof(union iucv_param
));
881 parm
->ctrl
.ipmsglim
= path
->msglim
;
882 parm
->ctrl
.ipflags1
= path
->flags
;
884 memcpy(parm
->ctrl
.ipvmid
, userid
, sizeof(parm
->ctrl
.ipvmid
));
885 ASCEBC(parm
->ctrl
.ipvmid
, sizeof(parm
->ctrl
.ipvmid
));
886 EBC_TOUPPER(parm
->ctrl
.ipvmid
, sizeof(parm
->ctrl
.ipvmid
));
889 memcpy(parm
->ctrl
.iptarget
, system
,
890 sizeof(parm
->ctrl
.iptarget
));
891 ASCEBC(parm
->ctrl
.iptarget
, sizeof(parm
->ctrl
.iptarget
));
892 EBC_TOUPPER(parm
->ctrl
.iptarget
, sizeof(parm
->ctrl
.iptarget
));
895 memcpy(parm
->ctrl
.ipuser
, userdata
, sizeof(parm
->ctrl
.ipuser
));
897 rc
= iucv_call_b2f0(IUCV_CONNECT
, parm
);
899 if (parm
->ctrl
.ippathid
< iucv_max_pathid
) {
900 path
->pathid
= parm
->ctrl
.ippathid
;
901 path
->msglim
= parm
->ctrl
.ipmsglim
;
902 path
->flags
= parm
->ctrl
.ipflags1
;
903 path
->handler
= handler
;
904 path
->private = private;
905 list_add_tail(&path
->list
, &handler
->paths
);
906 iucv_path_table
[path
->pathid
] = path
;
908 iucv_sever_pathid(parm
->ctrl
.ippathid
,
914 spin_unlock_bh(&iucv_table_lock
);
917 EXPORT_SYMBOL(iucv_path_connect
);
921 * @path: address of iucv path structure
922 * @userdata: 16 bytes of data reflected to the communication partner
924 * This function temporarily suspends incoming messages on an IUCV path.
925 * You can later reactivate the path by invoking the iucv_resume function.
927 * Returns the result from the CP IUCV call.
929 int iucv_path_quiesce(struct iucv_path
*path
, u8
*userdata
)
931 union iucv_param
*parm
;
935 if (cpumask_empty(&iucv_buffer_cpumask
)) {
939 parm
= iucv_param
[smp_processor_id()];
940 memset(parm
, 0, sizeof(union iucv_param
));
942 memcpy(parm
->ctrl
.ipuser
, userdata
, sizeof(parm
->ctrl
.ipuser
));
943 parm
->ctrl
.ippathid
= path
->pathid
;
944 rc
= iucv_call_b2f0(IUCV_QUIESCE
, parm
);
949 EXPORT_SYMBOL(iucv_path_quiesce
);
953 * @path: address of iucv path structure
954 * @userdata: 16 bytes of data reflected to the communication partner
956 * This function resumes incoming messages on an IUCV path that has
957 * been stopped with iucv_path_quiesce.
959 * Returns the result from the CP IUCV call.
961 int iucv_path_resume(struct iucv_path
*path
, u8
*userdata
)
963 union iucv_param
*parm
;
967 if (cpumask_empty(&iucv_buffer_cpumask
)) {
971 parm
= iucv_param
[smp_processor_id()];
972 memset(parm
, 0, sizeof(union iucv_param
));
974 memcpy(parm
->ctrl
.ipuser
, userdata
, sizeof(parm
->ctrl
.ipuser
));
975 parm
->ctrl
.ippathid
= path
->pathid
;
976 rc
= iucv_call_b2f0(IUCV_RESUME
, parm
);
984 * @path: address of iucv path structure
985 * @userdata: 16 bytes of data reflected to the communication partner
987 * This function terminates an IUCV path.
989 * Returns the result from the CP IUCV call.
991 int iucv_path_sever(struct iucv_path
*path
, u8
*userdata
)
996 if (cpumask_empty(&iucv_buffer_cpumask
)) {
1000 if (iucv_active_cpu
!= smp_processor_id())
1001 spin_lock_bh(&iucv_table_lock
);
1002 rc
= iucv_sever_pathid(path
->pathid
, userdata
);
1003 iucv_path_table
[path
->pathid
] = NULL
;
1004 list_del_init(&path
->list
);
1005 if (iucv_active_cpu
!= smp_processor_id())
1006 spin_unlock_bh(&iucv_table_lock
);
1011 EXPORT_SYMBOL(iucv_path_sever
);
1014 * iucv_message_purge
1015 * @path: address of iucv path structure
1016 * @msg: address of iucv msg structure
1017 * @srccls: source class of message
1019 * Cancels a message you have sent.
1021 * Returns the result from the CP IUCV call.
1023 int iucv_message_purge(struct iucv_path
*path
, struct iucv_message
*msg
,
1026 union iucv_param
*parm
;
1030 if (cpumask_empty(&iucv_buffer_cpumask
)) {
1034 parm
= iucv_param
[smp_processor_id()];
1035 memset(parm
, 0, sizeof(union iucv_param
));
1036 parm
->purge
.ippathid
= path
->pathid
;
1037 parm
->purge
.ipmsgid
= msg
->id
;
1038 parm
->purge
.ipsrccls
= srccls
;
1039 parm
->purge
.ipflags1
= IUCV_IPSRCCLS
| IUCV_IPFGMID
| IUCV_IPFGPID
;
1040 rc
= iucv_call_b2f0(IUCV_PURGE
, parm
);
1042 msg
->audit
= (*(u32
*) &parm
->purge
.ipaudit
) >> 8;
1043 msg
->tag
= parm
->purge
.ipmsgtag
;
1049 EXPORT_SYMBOL(iucv_message_purge
);
1052 * iucv_message_receive_iprmdata
1053 * @path: address of iucv path structure
1054 * @msg: address of iucv msg structure
1055 * @flags: how the message is received (IUCV_IPBUFLST)
1056 * @buffer: address of data buffer or address of struct iucv_array
1057 * @size: length of data buffer
1060 * Internal function used by iucv_message_receive and __iucv_message_receive
1061 * to receive RMDATA data stored in struct iucv_message.
1063 static int iucv_message_receive_iprmdata(struct iucv_path
*path
,
1064 struct iucv_message
*msg
,
1065 u8 flags
, void *buffer
,
1066 size_t size
, size_t *residual
)
1068 struct iucv_array
*array
;
1073 * Message is 8 bytes long and has been stored to the
1074 * message descriptor itself.
1077 *residual
= abs(size
- 8);
1079 if (flags
& IUCV_IPBUFLST
) {
1080 /* Copy to struct iucv_array. */
1081 size
= (size
< 8) ? size
: 8;
1082 for (array
= buffer
; size
> 0; array
++) {
1083 copy
= min_t(size_t, size
, array
->length
);
1084 memcpy((u8
*)(addr_t
) array
->address
,
1090 /* Copy to direct buffer. */
1091 memcpy(buffer
, rmmsg
, min_t(size_t, size
, 8));
1097 * __iucv_message_receive
1098 * @path: address of iucv path structure
1099 * @msg: address of iucv msg structure
1100 * @flags: how the message is received (IUCV_IPBUFLST)
1101 * @buffer: address of data buffer or address of struct iucv_array
1102 * @size: length of data buffer
1105 * This function receives messages that are being sent to you over
1106 * established paths. This function will deal with RMDATA messages
1107 * embedded in struct iucv_message as well.
1109 * Locking: no locking
1111 * Returns the result from the CP IUCV call.
1113 int __iucv_message_receive(struct iucv_path
*path
, struct iucv_message
*msg
,
1114 u8 flags
, void *buffer
, size_t size
, size_t *residual
)
1116 union iucv_param
*parm
;
1119 if (msg
->flags
& IUCV_IPRMDATA
)
1120 return iucv_message_receive_iprmdata(path
, msg
, flags
,
1121 buffer
, size
, residual
);
1122 if (cpumask_empty(&iucv_buffer_cpumask
))
1125 parm
= iucv_param
[smp_processor_id()];
1126 memset(parm
, 0, sizeof(union iucv_param
));
1127 parm
->db
.ipbfadr1
= (u32
)virt_to_phys(buffer
);
1128 parm
->db
.ipbfln1f
= (u32
) size
;
1129 parm
->db
.ipmsgid
= msg
->id
;
1130 parm
->db
.ippathid
= path
->pathid
;
1131 parm
->db
.iptrgcls
= msg
->class;
1132 parm
->db
.ipflags1
= (flags
| IUCV_IPFGPID
|
1133 IUCV_IPFGMID
| IUCV_IPTRGCLS
);
1134 rc
= iucv_call_b2f0(IUCV_RECEIVE
, parm
);
1135 if (!rc
|| rc
== 5) {
1136 msg
->flags
= parm
->db
.ipflags1
;
1138 *residual
= parm
->db
.ipbfln1f
;
1142 EXPORT_SYMBOL(__iucv_message_receive
);
1145 * iucv_message_receive
1146 * @path: address of iucv path structure
1147 * @msg: address of iucv msg structure
1148 * @flags: how the message is received (IUCV_IPBUFLST)
1149 * @buffer: address of data buffer or address of struct iucv_array
1150 * @size: length of data buffer
1153 * This function receives messages that are being sent to you over
1154 * established paths. This function will deal with RMDATA messages
1155 * embedded in struct iucv_message as well.
1157 * Locking: local_bh_enable/local_bh_disable
1159 * Returns the result from the CP IUCV call.
1161 int iucv_message_receive(struct iucv_path
*path
, struct iucv_message
*msg
,
1162 u8 flags
, void *buffer
, size_t size
, size_t *residual
)
1166 if (msg
->flags
& IUCV_IPRMDATA
)
1167 return iucv_message_receive_iprmdata(path
, msg
, flags
,
1168 buffer
, size
, residual
);
1170 rc
= __iucv_message_receive(path
, msg
, flags
, buffer
, size
, residual
);
1174 EXPORT_SYMBOL(iucv_message_receive
);
1177 * iucv_message_reject
1178 * @path: address of iucv path structure
1179 * @msg: address of iucv msg structure
1181 * The reject function refuses a specified message. Between the time you
1182 * are notified of a message and the time that you complete the message,
1183 * the message may be rejected.
1185 * Returns the result from the CP IUCV call.
1187 int iucv_message_reject(struct iucv_path
*path
, struct iucv_message
*msg
)
1189 union iucv_param
*parm
;
1193 if (cpumask_empty(&iucv_buffer_cpumask
)) {
1197 parm
= iucv_param
[smp_processor_id()];
1198 memset(parm
, 0, sizeof(union iucv_param
));
1199 parm
->db
.ippathid
= path
->pathid
;
1200 parm
->db
.ipmsgid
= msg
->id
;
1201 parm
->db
.iptrgcls
= msg
->class;
1202 parm
->db
.ipflags1
= (IUCV_IPTRGCLS
| IUCV_IPFGMID
| IUCV_IPFGPID
);
1203 rc
= iucv_call_b2f0(IUCV_REJECT
, parm
);
1208 EXPORT_SYMBOL(iucv_message_reject
);
1211 * iucv_message_reply
1212 * @path: address of iucv path structure
1213 * @msg: address of iucv msg structure
1214 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1215 * @reply: address of reply data buffer or address of struct iucv_array
1216 * @size: length of reply data buffer
1218 * This function responds to the two-way messages that you receive. You
1219 * must identify completely the message to which you wish to reply. ie,
1220 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1221 * the parameter list.
1223 * Returns the result from the CP IUCV call.
1225 int iucv_message_reply(struct iucv_path
*path
, struct iucv_message
*msg
,
1226 u8 flags
, void *reply
, size_t size
)
1228 union iucv_param
*parm
;
1232 if (cpumask_empty(&iucv_buffer_cpumask
)) {
1236 parm
= iucv_param
[smp_processor_id()];
1237 memset(parm
, 0, sizeof(union iucv_param
));
1238 if (flags
& IUCV_IPRMDATA
) {
1239 parm
->dpl
.ippathid
= path
->pathid
;
1240 parm
->dpl
.ipflags1
= flags
;
1241 parm
->dpl
.ipmsgid
= msg
->id
;
1242 parm
->dpl
.iptrgcls
= msg
->class;
1243 memcpy(parm
->dpl
.iprmmsg
, reply
, min_t(size_t, size
, 8));
1245 parm
->db
.ipbfadr1
= (u32
)virt_to_phys(reply
);
1246 parm
->db
.ipbfln1f
= (u32
) size
;
1247 parm
->db
.ippathid
= path
->pathid
;
1248 parm
->db
.ipflags1
= flags
;
1249 parm
->db
.ipmsgid
= msg
->id
;
1250 parm
->db
.iptrgcls
= msg
->class;
1252 rc
= iucv_call_b2f0(IUCV_REPLY
, parm
);
1257 EXPORT_SYMBOL(iucv_message_reply
);
1260 * __iucv_message_send
1261 * @path: address of iucv path structure
1262 * @msg: address of iucv msg structure
1263 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1264 * @srccls: source class of message
1265 * @buffer: address of send buffer or address of struct iucv_array
1266 * @size: length of send buffer
1268 * This function transmits data to another application. Data to be
1269 * transmitted is in a buffer and this is a one-way message and the
1270 * receiver will not reply to the message.
1272 * Locking: no locking
1274 * Returns the result from the CP IUCV call.
1276 int __iucv_message_send(struct iucv_path
*path
, struct iucv_message
*msg
,
1277 u8 flags
, u32 srccls
, void *buffer
, size_t size
)
1279 union iucv_param
*parm
;
1282 if (cpumask_empty(&iucv_buffer_cpumask
)) {
1286 parm
= iucv_param
[smp_processor_id()];
1287 memset(parm
, 0, sizeof(union iucv_param
));
1288 if (flags
& IUCV_IPRMDATA
) {
1289 /* Message of 8 bytes can be placed into the parameter list. */
1290 parm
->dpl
.ippathid
= path
->pathid
;
1291 parm
->dpl
.ipflags1
= flags
| IUCV_IPNORPY
;
1292 parm
->dpl
.iptrgcls
= msg
->class;
1293 parm
->dpl
.ipsrccls
= srccls
;
1294 parm
->dpl
.ipmsgtag
= msg
->tag
;
1295 memcpy(parm
->dpl
.iprmmsg
, buffer
, 8);
1297 parm
->db
.ipbfadr1
= (u32
)virt_to_phys(buffer
);
1298 parm
->db
.ipbfln1f
= (u32
) size
;
1299 parm
->db
.ippathid
= path
->pathid
;
1300 parm
->db
.ipflags1
= flags
| IUCV_IPNORPY
;
1301 parm
->db
.iptrgcls
= msg
->class;
1302 parm
->db
.ipsrccls
= srccls
;
1303 parm
->db
.ipmsgtag
= msg
->tag
;
1305 rc
= iucv_call_b2f0(IUCV_SEND
, parm
);
1307 msg
->id
= parm
->db
.ipmsgid
;
1311 EXPORT_SYMBOL(__iucv_message_send
);
1315 * @path: address of iucv path structure
1316 * @msg: address of iucv msg structure
1317 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1318 * @srccls: source class of message
1319 * @buffer: address of send buffer or address of struct iucv_array
1320 * @size: length of send buffer
1322 * This function transmits data to another application. Data to be
1323 * transmitted is in a buffer and this is a one-way message and the
1324 * receiver will not reply to the message.
1326 * Locking: local_bh_enable/local_bh_disable
1328 * Returns the result from the CP IUCV call.
1330 int iucv_message_send(struct iucv_path
*path
, struct iucv_message
*msg
,
1331 u8 flags
, u32 srccls
, void *buffer
, size_t size
)
1336 rc
= __iucv_message_send(path
, msg
, flags
, srccls
, buffer
, size
);
1340 EXPORT_SYMBOL(iucv_message_send
);
1343 * iucv_message_send2way
1344 * @path: address of iucv path structure
1345 * @msg: address of iucv msg structure
1346 * @flags: how the message is sent and the reply is received
1347 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1348 * @srccls: source class of message
1349 * @buffer: address of send buffer or address of struct iucv_array
1350 * @size: length of send buffer
1351 * @answer: address of answer buffer or address of struct iucv_array
1352 * @asize: size of reply buffer
1353 * @residual: ignored
1355 * This function transmits data to another application. Data to be
1356 * transmitted is in a buffer. The receiver of the send is expected to
1357 * reply to the message and a buffer is provided into which IUCV moves
1358 * the reply to this message.
1360 * Returns the result from the CP IUCV call.
1362 int iucv_message_send2way(struct iucv_path
*path
, struct iucv_message
*msg
,
1363 u8 flags
, u32 srccls
, void *buffer
, size_t size
,
1364 void *answer
, size_t asize
, size_t *residual
)
1366 union iucv_param
*parm
;
1370 if (cpumask_empty(&iucv_buffer_cpumask
)) {
1374 parm
= iucv_param
[smp_processor_id()];
1375 memset(parm
, 0, sizeof(union iucv_param
));
1376 if (flags
& IUCV_IPRMDATA
) {
1377 parm
->dpl
.ippathid
= path
->pathid
;
1378 parm
->dpl
.ipflags1
= path
->flags
; /* priority message */
1379 parm
->dpl
.iptrgcls
= msg
->class;
1380 parm
->dpl
.ipsrccls
= srccls
;
1381 parm
->dpl
.ipmsgtag
= msg
->tag
;
1382 parm
->dpl
.ipbfadr2
= (u32
)virt_to_phys(answer
);
1383 parm
->dpl
.ipbfln2f
= (u32
) asize
;
1384 memcpy(parm
->dpl
.iprmmsg
, buffer
, 8);
1386 parm
->db
.ippathid
= path
->pathid
;
1387 parm
->db
.ipflags1
= path
->flags
; /* priority message */
1388 parm
->db
.iptrgcls
= msg
->class;
1389 parm
->db
.ipsrccls
= srccls
;
1390 parm
->db
.ipmsgtag
= msg
->tag
;
1391 parm
->db
.ipbfadr1
= (u32
)virt_to_phys(buffer
);
1392 parm
->db
.ipbfln1f
= (u32
) size
;
1393 parm
->db
.ipbfadr2
= (u32
)virt_to_phys(answer
);
1394 parm
->db
.ipbfln2f
= (u32
) asize
;
1396 rc
= iucv_call_b2f0(IUCV_SEND
, parm
);
1398 msg
->id
= parm
->db
.ipmsgid
;
1403 EXPORT_SYMBOL(iucv_message_send2way
);
1405 struct iucv_path_pending
{
1420 * @data: Pointer to external interrupt buffer
1422 * Process connection pending work item. Called from tasklet while holding
1425 static void iucv_path_pending(struct iucv_irq_data
*data
)
1427 struct iucv_path_pending
*ipp
= (void *) data
;
1428 struct iucv_handler
*handler
;
1429 struct iucv_path
*path
;
1432 BUG_ON(iucv_path_table
[ipp
->ippathid
]);
1433 /* New pathid, handler found. Create a new path struct. */
1434 error
= iucv_error_no_memory
;
1435 path
= iucv_path_alloc(ipp
->ipmsglim
, ipp
->ipflags1
, GFP_ATOMIC
);
1438 path
->pathid
= ipp
->ippathid
;
1439 iucv_path_table
[path
->pathid
] = path
;
1440 EBCASC(ipp
->ipvmid
, 8);
1442 /* Call registered handler until one is found that wants the path. */
1443 list_for_each_entry(handler
, &iucv_handler_list
, list
) {
1444 if (!handler
->path_pending
)
1447 * Add path to handler to allow a call to iucv_path_sever
1448 * inside the path_pending function. If the handler returns
1449 * an error remove the path from the handler again.
1451 list_add(&path
->list
, &handler
->paths
);
1452 path
->handler
= handler
;
1453 if (!handler
->path_pending(path
, ipp
->ipvmid
, ipp
->ipuser
))
1455 list_del(&path
->list
);
1456 path
->handler
= NULL
;
1458 /* No handler wanted the path. */
1459 iucv_path_table
[path
->pathid
] = NULL
;
1460 iucv_path_free(path
);
1461 error
= iucv_error_no_listener
;
1463 iucv_sever_pathid(ipp
->ippathid
, error
);
1466 struct iucv_path_complete
{
1480 * iucv_path_complete
1481 * @data: Pointer to external interrupt buffer
1483 * Process connection complete work item. Called from tasklet while holding
1486 static void iucv_path_complete(struct iucv_irq_data
*data
)
1488 struct iucv_path_complete
*ipc
= (void *) data
;
1489 struct iucv_path
*path
= iucv_path_table
[ipc
->ippathid
];
1492 path
->flags
= ipc
->ipflags1
;
1493 if (path
&& path
->handler
&& path
->handler
->path_complete
)
1494 path
->handler
->path_complete(path
, ipc
->ipuser
);
1497 struct iucv_path_severed
{
1511 * @data: Pointer to external interrupt buffer
1513 * Process connection severed work item. Called from tasklet while holding
1516 static void iucv_path_severed(struct iucv_irq_data
*data
)
1518 struct iucv_path_severed
*ips
= (void *) data
;
1519 struct iucv_path
*path
= iucv_path_table
[ips
->ippathid
];
1521 if (!path
|| !path
->handler
) /* Already severed */
1523 if (path
->handler
->path_severed
)
1524 path
->handler
->path_severed(path
, ips
->ipuser
);
1526 iucv_sever_pathid(path
->pathid
, NULL
);
1527 iucv_path_table
[path
->pathid
] = NULL
;
1528 list_del(&path
->list
);
1529 iucv_path_free(path
);
1533 struct iucv_path_quiesced
{
1546 * iucv_path_quiesced
1547 * @data: Pointer to external interrupt buffer
1549 * Process connection quiesced work item. Called from tasklet while holding
1552 static void iucv_path_quiesced(struct iucv_irq_data
*data
)
1554 struct iucv_path_quiesced
*ipq
= (void *) data
;
1555 struct iucv_path
*path
= iucv_path_table
[ipq
->ippathid
];
1557 if (path
&& path
->handler
&& path
->handler
->path_quiesced
)
1558 path
->handler
->path_quiesced(path
, ipq
->ipuser
);
1561 struct iucv_path_resumed
{
1575 * @data: Pointer to external interrupt buffer
1577 * Process connection resumed work item. Called from tasklet while holding
1580 static void iucv_path_resumed(struct iucv_irq_data
*data
)
1582 struct iucv_path_resumed
*ipr
= (void *) data
;
1583 struct iucv_path
*path
= iucv_path_table
[ipr
->ippathid
];
1585 if (path
&& path
->handler
&& path
->handler
->path_resumed
)
1586 path
->handler
->path_resumed(path
, ipr
->ipuser
);
1589 struct iucv_message_complete
{
1605 * iucv_message_complete
1606 * @data: Pointer to external interrupt buffer
1608 * Process message complete work item. Called from tasklet while holding
1611 static void iucv_message_complete(struct iucv_irq_data
*data
)
1613 struct iucv_message_complete
*imc
= (void *) data
;
1614 struct iucv_path
*path
= iucv_path_table
[imc
->ippathid
];
1615 struct iucv_message msg
;
1617 if (path
&& path
->handler
&& path
->handler
->message_complete
) {
1618 msg
.flags
= imc
->ipflags1
;
1619 msg
.id
= imc
->ipmsgid
;
1620 msg
.audit
= imc
->ipaudit
;
1621 memcpy(msg
.rmmsg
, imc
->iprmmsg
, 8);
1622 msg
.class = imc
->ipsrccls
;
1623 msg
.tag
= imc
->ipmsgtag
;
1624 msg
.length
= imc
->ipbfln2f
;
1625 path
->handler
->message_complete(path
, &msg
);
1629 struct iucv_message_pending
{
1652 * iucv_message_pending
1653 * @data: Pointer to external interrupt buffer
1655 * Process message pending work item. Called from tasklet while holding
1658 static void iucv_message_pending(struct iucv_irq_data
*data
)
1660 struct iucv_message_pending
*imp
= (void *) data
;
1661 struct iucv_path
*path
= iucv_path_table
[imp
->ippathid
];
1662 struct iucv_message msg
;
1664 if (path
&& path
->handler
&& path
->handler
->message_pending
) {
1665 msg
.flags
= imp
->ipflags1
;
1666 msg
.id
= imp
->ipmsgid
;
1667 msg
.class = imp
->iptrgcls
;
1668 if (imp
->ipflags1
& IUCV_IPRMDATA
) {
1669 memcpy(msg
.rmmsg
, &imp
->rmmsg
, 8);
1672 msg
.length
= imp
->rmmsg
.ln1msg2
.ipbfln1f
;
1673 msg
.reply_size
= imp
->ipbfln2f
;
1674 path
->handler
->message_pending(path
, &msg
);
1681 * This tasklet loops over the queue of irq buffers created by
1682 * iucv_external_interrupt, calls the appropriate action handler
1683 * and then frees the buffer.
1685 static void iucv_tasklet_fn(unsigned long ignored
)
1687 typedef void iucv_irq_fn(struct iucv_irq_data
*);
1688 static iucv_irq_fn
*irq_fn
[] = {
1689 [0x02] = iucv_path_complete
,
1690 [0x03] = iucv_path_severed
,
1691 [0x04] = iucv_path_quiesced
,
1692 [0x05] = iucv_path_resumed
,
1693 [0x06] = iucv_message_complete
,
1694 [0x07] = iucv_message_complete
,
1695 [0x08] = iucv_message_pending
,
1696 [0x09] = iucv_message_pending
,
1698 LIST_HEAD(task_queue
);
1699 struct iucv_irq_list
*p
, *n
;
1701 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1702 if (!spin_trylock(&iucv_table_lock
)) {
1703 tasklet_schedule(&iucv_tasklet
);
1706 iucv_active_cpu
= smp_processor_id();
1708 spin_lock_irq(&iucv_queue_lock
);
1709 list_splice_init(&iucv_task_queue
, &task_queue
);
1710 spin_unlock_irq(&iucv_queue_lock
);
1712 list_for_each_entry_safe(p
, n
, &task_queue
, list
) {
1713 list_del_init(&p
->list
);
1714 irq_fn
[p
->data
.iptype
](&p
->data
);
1718 iucv_active_cpu
= -1;
1719 spin_unlock(&iucv_table_lock
);
1725 * This work function loops over the queue of path pending irq blocks
1726 * created by iucv_external_interrupt, calls the appropriate action
1727 * handler and then frees the buffer.
1729 static void iucv_work_fn(struct work_struct
*work
)
1731 LIST_HEAD(work_queue
);
1732 struct iucv_irq_list
*p
, *n
;
1734 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1735 spin_lock_bh(&iucv_table_lock
);
1736 iucv_active_cpu
= smp_processor_id();
1738 spin_lock_irq(&iucv_queue_lock
);
1739 list_splice_init(&iucv_work_queue
, &work_queue
);
1740 spin_unlock_irq(&iucv_queue_lock
);
1742 iucv_cleanup_queue();
1743 list_for_each_entry_safe(p
, n
, &work_queue
, list
) {
1744 list_del_init(&p
->list
);
1745 iucv_path_pending(&p
->data
);
1749 iucv_active_cpu
= -1;
1750 spin_unlock_bh(&iucv_table_lock
);
1754 * iucv_external_interrupt
1756 * Handles external interrupts coming in from CP.
1757 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1759 static void iucv_external_interrupt(struct ext_code ext_code
,
1760 unsigned int param32
, unsigned long param64
)
1762 struct iucv_irq_data
*p
;
1763 struct iucv_irq_list
*work
;
1765 inc_irq_stat(IRQEXT_IUC
);
1766 p
= iucv_irq_data
[smp_processor_id()];
1767 if (p
->ippathid
>= iucv_max_pathid
) {
1768 WARN_ON(p
->ippathid
>= iucv_max_pathid
);
1769 iucv_sever_pathid(p
->ippathid
, iucv_error_no_listener
);
1772 BUG_ON(p
->iptype
< 0x01 || p
->iptype
> 0x09);
1773 work
= kmalloc(sizeof(struct iucv_irq_list
), GFP_ATOMIC
);
1775 pr_warn("iucv_external_interrupt: out of memory\n");
1778 memcpy(&work
->data
, p
, sizeof(work
->data
));
1779 spin_lock(&iucv_queue_lock
);
1780 if (p
->iptype
== 0x01) {
1781 /* Path pending interrupt. */
1782 list_add_tail(&work
->list
, &iucv_work_queue
);
1783 schedule_work(&iucv_work
);
1785 /* The other interrupts. */
1786 list_add_tail(&work
->list
, &iucv_task_queue
);
1787 tasklet_schedule(&iucv_tasklet
);
1789 spin_unlock(&iucv_queue_lock
);
1792 struct iucv_interface iucv_if
= {
1793 .message_receive
= iucv_message_receive
,
1794 .__message_receive
= __iucv_message_receive
,
1795 .message_reply
= iucv_message_reply
,
1796 .message_reject
= iucv_message_reject
,
1797 .message_send
= iucv_message_send
,
1798 .__message_send
= __iucv_message_send
,
1799 .message_send2way
= iucv_message_send2way
,
1800 .message_purge
= iucv_message_purge
,
1801 .path_accept
= iucv_path_accept
,
1802 .path_connect
= iucv_path_connect
,
1803 .path_quiesce
= iucv_path_quiesce
,
1804 .path_resume
= iucv_path_resume
,
1805 .path_sever
= iucv_path_sever
,
1806 .iucv_register
= iucv_register
,
1807 .iucv_unregister
= iucv_unregister
,
1811 EXPORT_SYMBOL(iucv_if
);
1813 static enum cpuhp_state iucv_online
;
1817 * Allocates and initializes various data structures.
1819 static int __init
iucv_init(void)
1823 if (!MACHINE_IS_VM
) {
1824 rc
= -EPROTONOSUPPORT
;
1827 system_ctl_set_bit(0, CR0_IUCV_BIT
);
1828 rc
= iucv_query_maxconn();
1831 rc
= register_external_irq(EXT_IRQ_IUCV
, iucv_external_interrupt
);
1834 iucv_root
= root_device_register("iucv");
1835 if (IS_ERR(iucv_root
)) {
1836 rc
= PTR_ERR(iucv_root
);
1840 rc
= cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE
, "net/iucv:prepare",
1841 iucv_cpu_prepare
, iucv_cpu_dead
);
1844 rc
= cpuhp_setup_state(CPUHP_AP_ONLINE_DYN
, "net/iucv:online",
1845 iucv_cpu_online
, iucv_cpu_down_prep
);
1850 rc
= register_reboot_notifier(&iucv_reboot_notifier
);
1853 ASCEBC(iucv_error_no_listener
, 16);
1854 ASCEBC(iucv_error_no_memory
, 16);
1855 ASCEBC(iucv_error_pathid
, 16);
1857 rc
= bus_register(&iucv_bus
);
1860 iucv_if
.root
= iucv_root
;
1861 iucv_if
.bus
= &iucv_bus
;
1865 unregister_reboot_notifier(&iucv_reboot_notifier
);
1867 cpuhp_remove_state(iucv_online
);
1869 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE
);
1871 root_device_unregister(iucv_root
);
1873 unregister_external_irq(EXT_IRQ_IUCV
, iucv_external_interrupt
);
1875 system_ctl_clear_bit(0, 1);
1883 * Frees everything allocated from iucv_init.
1885 static void __exit
iucv_exit(void)
1887 struct iucv_irq_list
*p
, *n
;
1889 spin_lock_irq(&iucv_queue_lock
);
1890 list_for_each_entry_safe(p
, n
, &iucv_task_queue
, list
)
1892 list_for_each_entry_safe(p
, n
, &iucv_work_queue
, list
)
1894 spin_unlock_irq(&iucv_queue_lock
);
1895 unregister_reboot_notifier(&iucv_reboot_notifier
);
1897 cpuhp_remove_state_nocalls(iucv_online
);
1898 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE
);
1899 root_device_unregister(iucv_root
);
1900 bus_unregister(&iucv_bus
);
1901 unregister_external_irq(EXT_IRQ_IUCV
, iucv_external_interrupt
);
1904 subsys_initcall(iucv_init
);
1905 module_exit(iucv_exit
);
1907 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert <felfert@millenux.com>");
1908 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1909 MODULE_LICENSE("GPL");