jme: Fix device PM wakeup API usage
[linux/fpc-iii.git] / net / iucv / iucv.c
blobda787930df0ab643a81bfa1f3f554efb2cd41bee
1 /*
2 * IUCV base infrastructure.
4 * Copyright IBM Corp. 2001, 2009
6 * Author(s):
7 * Original source:
8 * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
9 * Xenia Tkatschow (xenia@us.ibm.com)
10 * 2Gb awareness and general cleanup:
11 * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
12 * Rewritten for af_iucv:
13 * Martin Schwidefsky <schwidefsky@de.ibm.com>
14 * PM functions:
15 * Ursula Braun (ursula.braun@de.ibm.com)
17 * Documentation used:
18 * The original source
19 * CP Programming Service, IBM document # SC24-5760
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License as published by
23 * the Free Software Foundation; either version 2, or (at your option)
24 * any later version.
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
36 #define KMSG_COMPONENT "iucv"
37 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
39 #include <linux/kernel_stat.h>
40 #include <linux/module.h>
41 #include <linux/moduleparam.h>
42 #include <linux/spinlock.h>
43 #include <linux/kernel.h>
44 #include <linux/slab.h>
45 #include <linux/init.h>
46 #include <linux/interrupt.h>
47 #include <linux/list.h>
48 #include <linux/errno.h>
49 #include <linux/err.h>
50 #include <linux/device.h>
51 #include <linux/cpu.h>
52 #include <linux/reboot.h>
53 #include <net/iucv/iucv.h>
54 #include <linux/atomic.h>
55 #include <asm/ebcdic.h>
56 #include <asm/io.h>
57 #include <asm/irq.h>
58 #include <asm/smp.h>
61 * FLAGS:
62 * All flags are defined in the field IPFLAGS1 of each function
63 * and can be found in CP Programming Services.
64 * IPSRCCLS - Indicates you have specified a source class.
65 * IPTRGCLS - Indicates you have specified a target class.
66 * IPFGPID - Indicates you have specified a pathid.
67 * IPFGMID - Indicates you have specified a message ID.
68 * IPNORPY - Indicates a one-way message. No reply expected.
69 * IPALL - Indicates that all paths are affected.
71 #define IUCV_IPSRCCLS 0x01
72 #define IUCV_IPTRGCLS 0x01
73 #define IUCV_IPFGPID 0x02
74 #define IUCV_IPFGMID 0x04
75 #define IUCV_IPNORPY 0x10
76 #define IUCV_IPALL 0x80
78 static int iucv_bus_match(struct device *dev, struct device_driver *drv)
80 return 0;
83 enum iucv_pm_states {
84 IUCV_PM_INITIAL = 0,
85 IUCV_PM_FREEZING = 1,
86 IUCV_PM_THAWING = 2,
87 IUCV_PM_RESTORING = 3,
89 static enum iucv_pm_states iucv_pm_state;
91 static int iucv_pm_prepare(struct device *);
92 static void iucv_pm_complete(struct device *);
93 static int iucv_pm_freeze(struct device *);
94 static int iucv_pm_thaw(struct device *);
95 static int iucv_pm_restore(struct device *);
97 static const struct dev_pm_ops iucv_pm_ops = {
98 .prepare = iucv_pm_prepare,
99 .complete = iucv_pm_complete,
100 .freeze = iucv_pm_freeze,
101 .thaw = iucv_pm_thaw,
102 .restore = iucv_pm_restore,
105 struct bus_type iucv_bus = {
106 .name = "iucv",
107 .match = iucv_bus_match,
108 .pm = &iucv_pm_ops,
110 EXPORT_SYMBOL(iucv_bus);
112 struct device *iucv_root;
113 EXPORT_SYMBOL(iucv_root);
115 static int iucv_available;
117 /* General IUCV interrupt structure */
118 struct iucv_irq_data {
119 u16 ippathid;
120 u8 ipflags1;
121 u8 iptype;
122 u32 res2[8];
125 struct iucv_irq_list {
126 struct list_head list;
127 struct iucv_irq_data data;
130 static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
131 static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE };
132 static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE };
135 * Queue of interrupt buffers lock for delivery via the tasklet
136 * (fast but can't call smp_call_function).
138 static LIST_HEAD(iucv_task_queue);
141 * The tasklet for fast delivery of iucv interrupts.
143 static void iucv_tasklet_fn(unsigned long);
144 static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
147 * Queue of interrupt buffers for delivery via a work queue
148 * (slower but can call smp_call_function).
150 static LIST_HEAD(iucv_work_queue);
153 * The work element to deliver path pending interrupts.
155 static void iucv_work_fn(struct work_struct *work);
156 static DECLARE_WORK(iucv_work, iucv_work_fn);
159 * Spinlock protecting task and work queue.
161 static DEFINE_SPINLOCK(iucv_queue_lock);
163 enum iucv_command_codes {
164 IUCV_QUERY = 0,
165 IUCV_RETRIEVE_BUFFER = 2,
166 IUCV_SEND = 4,
167 IUCV_RECEIVE = 5,
168 IUCV_REPLY = 6,
169 IUCV_REJECT = 8,
170 IUCV_PURGE = 9,
171 IUCV_ACCEPT = 10,
172 IUCV_CONNECT = 11,
173 IUCV_DECLARE_BUFFER = 12,
174 IUCV_QUIESCE = 13,
175 IUCV_RESUME = 14,
176 IUCV_SEVER = 15,
177 IUCV_SETMASK = 16,
178 IUCV_SETCONTROLMASK = 17,
182 * Error messages that are used with the iucv_sever function. They get
183 * converted to EBCDIC.
185 static char iucv_error_no_listener[16] = "NO LISTENER";
186 static char iucv_error_no_memory[16] = "NO MEMORY";
187 static char iucv_error_pathid[16] = "INVALID PATHID";
190 * iucv_handler_list: List of registered handlers.
192 static LIST_HEAD(iucv_handler_list);
195 * iucv_path_table: an array of iucv_path structures.
197 static struct iucv_path **iucv_path_table;
198 static unsigned long iucv_max_pathid;
201 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
203 static DEFINE_SPINLOCK(iucv_table_lock);
206 * iucv_active_cpu: contains the number of the cpu executing the tasklet
207 * or the work handler. Needed for iucv_path_sever called from tasklet.
209 static int iucv_active_cpu = -1;
212 * Mutex and wait queue for iucv_register/iucv_unregister.
214 static DEFINE_MUTEX(iucv_register_mutex);
217 * Counter for number of non-smp capable handlers.
219 static int iucv_nonsmp_handler;
222 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
223 * iucv_path_quiesce and iucv_path_sever.
225 struct iucv_cmd_control {
226 u16 ippathid;
227 u8 ipflags1;
228 u8 iprcode;
229 u16 ipmsglim;
230 u16 res1;
231 u8 ipvmid[8];
232 u8 ipuser[16];
233 u8 iptarget[8];
234 } __attribute__ ((packed,aligned(8)));
237 * Data in parameter list iucv structure. Used by iucv_message_send,
238 * iucv_message_send2way and iucv_message_reply.
240 struct iucv_cmd_dpl {
241 u16 ippathid;
242 u8 ipflags1;
243 u8 iprcode;
244 u32 ipmsgid;
245 u32 iptrgcls;
246 u8 iprmmsg[8];
247 u32 ipsrccls;
248 u32 ipmsgtag;
249 u32 ipbfadr2;
250 u32 ipbfln2f;
251 u32 res;
252 } __attribute__ ((packed,aligned(8)));
255 * Data in buffer iucv structure. Used by iucv_message_receive,
256 * iucv_message_reject, iucv_message_send, iucv_message_send2way
257 * and iucv_declare_cpu.
259 struct iucv_cmd_db {
260 u16 ippathid;
261 u8 ipflags1;
262 u8 iprcode;
263 u32 ipmsgid;
264 u32 iptrgcls;
265 u32 ipbfadr1;
266 u32 ipbfln1f;
267 u32 ipsrccls;
268 u32 ipmsgtag;
269 u32 ipbfadr2;
270 u32 ipbfln2f;
271 u32 res;
272 } __attribute__ ((packed,aligned(8)));
275 * Purge message iucv structure. Used by iucv_message_purge.
277 struct iucv_cmd_purge {
278 u16 ippathid;
279 u8 ipflags1;
280 u8 iprcode;
281 u32 ipmsgid;
282 u8 ipaudit[3];
283 u8 res1[5];
284 u32 res2;
285 u32 ipsrccls;
286 u32 ipmsgtag;
287 u32 res3[3];
288 } __attribute__ ((packed,aligned(8)));
291 * Set mask iucv structure. Used by iucv_enable_cpu.
293 struct iucv_cmd_set_mask {
294 u8 ipmask;
295 u8 res1[2];
296 u8 iprcode;
297 u32 res2[9];
298 } __attribute__ ((packed,aligned(8)));
300 union iucv_param {
301 struct iucv_cmd_control ctrl;
302 struct iucv_cmd_dpl dpl;
303 struct iucv_cmd_db db;
304 struct iucv_cmd_purge purge;
305 struct iucv_cmd_set_mask set_mask;
309 * Anchor for per-cpu IUCV command parameter block.
311 static union iucv_param *iucv_param[NR_CPUS];
312 static union iucv_param *iucv_param_irq[NR_CPUS];
315 * iucv_call_b2f0
316 * @code: identifier of IUCV call to CP.
317 * @parm: pointer to a struct iucv_parm block
319 * Calls CP to execute IUCV commands.
321 * Returns the result of the CP IUCV call.
323 static inline int iucv_call_b2f0(int command, union iucv_param *parm)
325 register unsigned long reg0 asm ("0");
326 register unsigned long reg1 asm ("1");
327 int ccode;
329 reg0 = command;
330 reg1 = virt_to_phys(parm);
331 asm volatile(
332 " .long 0xb2f01000\n"
333 " ipm %0\n"
334 " srl %0,28\n"
335 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
336 : "m" (*parm) : "cc");
337 return (ccode == 1) ? parm->ctrl.iprcode : ccode;
341 * iucv_query_maxconn
343 * Determines the maximum number of connections that may be established.
345 * Returns the maximum number of connections or -EPERM is IUCV is not
346 * available.
348 static int iucv_query_maxconn(void)
350 register unsigned long reg0 asm ("0");
351 register unsigned long reg1 asm ("1");
352 void *param;
353 int ccode;
355 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
356 if (!param)
357 return -ENOMEM;
358 reg0 = IUCV_QUERY;
359 reg1 = (unsigned long) param;
360 asm volatile (
361 " .long 0xb2f01000\n"
362 " ipm %0\n"
363 " srl %0,28\n"
364 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
365 if (ccode == 0)
366 iucv_max_pathid = reg1;
367 kfree(param);
368 return ccode ? -EPERM : 0;
372 * iucv_allow_cpu
373 * @data: unused
375 * Allow iucv interrupts on this cpu.
377 static void iucv_allow_cpu(void *data)
379 int cpu = smp_processor_id();
380 union iucv_param *parm;
383 * Enable all iucv interrupts.
384 * ipmask contains bits for the different interrupts
385 * 0x80 - Flag to allow nonpriority message pending interrupts
386 * 0x40 - Flag to allow priority message pending interrupts
387 * 0x20 - Flag to allow nonpriority message completion interrupts
388 * 0x10 - Flag to allow priority message completion interrupts
389 * 0x08 - Flag to allow IUCV control interrupts
391 parm = iucv_param_irq[cpu];
392 memset(parm, 0, sizeof(union iucv_param));
393 parm->set_mask.ipmask = 0xf8;
394 iucv_call_b2f0(IUCV_SETMASK, parm);
397 * Enable all iucv control interrupts.
398 * ipmask contains bits for the different interrupts
399 * 0x80 - Flag to allow pending connections interrupts
400 * 0x40 - Flag to allow connection complete interrupts
401 * 0x20 - Flag to allow connection severed interrupts
402 * 0x10 - Flag to allow connection quiesced interrupts
403 * 0x08 - Flag to allow connection resumed interrupts
405 memset(parm, 0, sizeof(union iucv_param));
406 parm->set_mask.ipmask = 0xf8;
407 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
408 /* Set indication that iucv interrupts are allowed for this cpu. */
409 cpumask_set_cpu(cpu, &iucv_irq_cpumask);
413 * iucv_block_cpu
414 * @data: unused
416 * Block iucv interrupts on this cpu.
418 static void iucv_block_cpu(void *data)
420 int cpu = smp_processor_id();
421 union iucv_param *parm;
423 /* Disable all iucv interrupts. */
424 parm = iucv_param_irq[cpu];
425 memset(parm, 0, sizeof(union iucv_param));
426 iucv_call_b2f0(IUCV_SETMASK, parm);
428 /* Clear indication that iucv interrupts are allowed for this cpu. */
429 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
433 * iucv_block_cpu_almost
434 * @data: unused
436 * Allow connection-severed interrupts only on this cpu.
438 static void iucv_block_cpu_almost(void *data)
440 int cpu = smp_processor_id();
441 union iucv_param *parm;
443 /* Allow iucv control interrupts only */
444 parm = iucv_param_irq[cpu];
445 memset(parm, 0, sizeof(union iucv_param));
446 parm->set_mask.ipmask = 0x08;
447 iucv_call_b2f0(IUCV_SETMASK, parm);
448 /* Allow iucv-severed interrupt only */
449 memset(parm, 0, sizeof(union iucv_param));
450 parm->set_mask.ipmask = 0x20;
451 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
453 /* Clear indication that iucv interrupts are allowed for this cpu. */
454 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
458 * iucv_declare_cpu
459 * @data: unused
461 * Declare a interrupt buffer on this cpu.
463 static void iucv_declare_cpu(void *data)
465 int cpu = smp_processor_id();
466 union iucv_param *parm;
467 int rc;
469 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
470 return;
472 /* Declare interrupt buffer. */
473 parm = iucv_param_irq[cpu];
474 memset(parm, 0, sizeof(union iucv_param));
475 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
476 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
477 if (rc) {
478 char *err = "Unknown";
479 switch (rc) {
480 case 0x03:
481 err = "Directory error";
482 break;
483 case 0x0a:
484 err = "Invalid length";
485 break;
486 case 0x13:
487 err = "Buffer already exists";
488 break;
489 case 0x3e:
490 err = "Buffer overlap";
491 break;
492 case 0x5c:
493 err = "Paging or storage error";
494 break;
496 pr_warning("Defining an interrupt buffer on CPU %i"
497 " failed with 0x%02x (%s)\n", cpu, rc, err);
498 return;
501 /* Set indication that an iucv buffer exists for this cpu. */
502 cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
504 if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
505 /* Enable iucv interrupts on this cpu. */
506 iucv_allow_cpu(NULL);
507 else
508 /* Disable iucv interrupts on this cpu. */
509 iucv_block_cpu(NULL);
513 * iucv_retrieve_cpu
514 * @data: unused
516 * Retrieve interrupt buffer on this cpu.
518 static void iucv_retrieve_cpu(void *data)
520 int cpu = smp_processor_id();
521 union iucv_param *parm;
523 if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
524 return;
526 /* Block iucv interrupts. */
527 iucv_block_cpu(NULL);
529 /* Retrieve interrupt buffer. */
530 parm = iucv_param_irq[cpu];
531 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
533 /* Clear indication that an iucv buffer exists for this cpu. */
534 cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
538 * iucv_setmask_smp
540 * Allow iucv interrupts on all cpus.
542 static void iucv_setmask_mp(void)
544 int cpu;
546 get_online_cpus();
547 for_each_online_cpu(cpu)
548 /* Enable all cpus with a declared buffer. */
549 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
550 !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
551 smp_call_function_single(cpu, iucv_allow_cpu,
552 NULL, 1);
553 put_online_cpus();
557 * iucv_setmask_up
559 * Allow iucv interrupts on a single cpu.
561 static void iucv_setmask_up(void)
563 cpumask_t cpumask;
564 int cpu;
566 /* Disable all cpu but the first in cpu_irq_cpumask. */
567 cpumask_copy(&cpumask, &iucv_irq_cpumask);
568 cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
569 for_each_cpu(cpu, &cpumask)
570 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
574 * iucv_enable
576 * This function makes iucv ready for use. It allocates the pathid
577 * table, declares an iucv interrupt buffer and enables the iucv
578 * interrupts. Called when the first user has registered an iucv
579 * handler.
581 static int iucv_enable(void)
583 size_t alloc_size;
584 int cpu, rc;
586 get_online_cpus();
587 rc = -ENOMEM;
588 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
589 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
590 if (!iucv_path_table)
591 goto out;
592 /* Declare per cpu buffers. */
593 rc = -EIO;
594 for_each_online_cpu(cpu)
595 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
596 if (cpumask_empty(&iucv_buffer_cpumask))
597 /* No cpu could declare an iucv buffer. */
598 goto out;
599 put_online_cpus();
600 return 0;
601 out:
602 kfree(iucv_path_table);
603 iucv_path_table = NULL;
604 put_online_cpus();
605 return rc;
609 * iucv_disable
611 * This function shuts down iucv. It disables iucv interrupts, retrieves
612 * the iucv interrupt buffer and frees the pathid table. Called after the
613 * last user unregister its iucv handler.
615 static void iucv_disable(void)
617 get_online_cpus();
618 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
619 kfree(iucv_path_table);
620 iucv_path_table = NULL;
621 put_online_cpus();
624 static void free_iucv_data(int cpu)
626 kfree(iucv_param_irq[cpu]);
627 iucv_param_irq[cpu] = NULL;
628 kfree(iucv_param[cpu]);
629 iucv_param[cpu] = NULL;
630 kfree(iucv_irq_data[cpu]);
631 iucv_irq_data[cpu] = NULL;
634 static int alloc_iucv_data(int cpu)
636 /* Note: GFP_DMA used to get memory below 2G */
637 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
638 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
639 if (!iucv_irq_data[cpu])
640 goto out_free;
642 /* Allocate parameter blocks. */
643 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
644 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
645 if (!iucv_param[cpu])
646 goto out_free;
648 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
649 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
650 if (!iucv_param_irq[cpu])
651 goto out_free;
653 return 0;
655 out_free:
656 free_iucv_data(cpu);
657 return -ENOMEM;
660 static int iucv_cpu_notify(struct notifier_block *self,
661 unsigned long action, void *hcpu)
663 cpumask_t cpumask;
664 long cpu = (long) hcpu;
666 switch (action) {
667 case CPU_UP_PREPARE:
668 case CPU_UP_PREPARE_FROZEN:
669 if (alloc_iucv_data(cpu))
670 return notifier_from_errno(-ENOMEM);
671 break;
672 case CPU_UP_CANCELED:
673 case CPU_UP_CANCELED_FROZEN:
674 case CPU_DEAD:
675 case CPU_DEAD_FROZEN:
676 free_iucv_data(cpu);
677 break;
678 case CPU_ONLINE:
679 case CPU_ONLINE_FROZEN:
680 case CPU_DOWN_FAILED:
681 case CPU_DOWN_FAILED_FROZEN:
682 if (!iucv_path_table)
683 break;
684 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
685 break;
686 case CPU_DOWN_PREPARE:
687 case CPU_DOWN_PREPARE_FROZEN:
688 if (!iucv_path_table)
689 break;
690 cpumask_copy(&cpumask, &iucv_buffer_cpumask);
691 cpumask_clear_cpu(cpu, &cpumask);
692 if (cpumask_empty(&cpumask))
693 /* Can't offline last IUCV enabled cpu. */
694 return notifier_from_errno(-EINVAL);
695 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
696 if (cpumask_empty(&iucv_irq_cpumask))
697 smp_call_function_single(
698 cpumask_first(&iucv_buffer_cpumask),
699 iucv_allow_cpu, NULL, 1);
700 break;
702 return NOTIFY_OK;
705 static struct notifier_block __refdata iucv_cpu_notifier = {
706 .notifier_call = iucv_cpu_notify,
710 * iucv_sever_pathid
711 * @pathid: path identification number.
712 * @userdata: 16-bytes of user data.
714 * Sever an iucv path to free up the pathid. Used internally.
716 static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
718 union iucv_param *parm;
720 parm = iucv_param_irq[smp_processor_id()];
721 memset(parm, 0, sizeof(union iucv_param));
722 if (userdata)
723 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
724 parm->ctrl.ippathid = pathid;
725 return iucv_call_b2f0(IUCV_SEVER, parm);
729 * __iucv_cleanup_queue
730 * @dummy: unused dummy argument
732 * Nop function called via smp_call_function to force work items from
733 * pending external iucv interrupts to the work queue.
735 static void __iucv_cleanup_queue(void *dummy)
740 * iucv_cleanup_queue
742 * Function called after a path has been severed to find all remaining
743 * work items for the now stale pathid. The caller needs to hold the
744 * iucv_table_lock.
746 static void iucv_cleanup_queue(void)
748 struct iucv_irq_list *p, *n;
751 * When a path is severed, the pathid can be reused immediately
752 * on a iucv connect or a connection pending interrupt. Remove
753 * all entries from the task queue that refer to a stale pathid
754 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
755 * or deliver the connection pending interrupt. To get all the
756 * pending interrupts force them to the work queue by calling
757 * an empty function on all cpus.
759 smp_call_function(__iucv_cleanup_queue, NULL, 1);
760 spin_lock_irq(&iucv_queue_lock);
761 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
762 /* Remove stale work items from the task queue. */
763 if (iucv_path_table[p->data.ippathid] == NULL) {
764 list_del(&p->list);
765 kfree(p);
768 spin_unlock_irq(&iucv_queue_lock);
772 * iucv_register:
773 * @handler: address of iucv handler structure
774 * @smp: != 0 indicates that the handler can deal with out of order messages
776 * Registers a driver with IUCV.
778 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
779 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
781 int iucv_register(struct iucv_handler *handler, int smp)
783 int rc;
785 if (!iucv_available)
786 return -ENOSYS;
787 mutex_lock(&iucv_register_mutex);
788 if (!smp)
789 iucv_nonsmp_handler++;
790 if (list_empty(&iucv_handler_list)) {
791 rc = iucv_enable();
792 if (rc)
793 goto out_mutex;
794 } else if (!smp && iucv_nonsmp_handler == 1)
795 iucv_setmask_up();
796 INIT_LIST_HEAD(&handler->paths);
798 spin_lock_bh(&iucv_table_lock);
799 list_add_tail(&handler->list, &iucv_handler_list);
800 spin_unlock_bh(&iucv_table_lock);
801 rc = 0;
802 out_mutex:
803 mutex_unlock(&iucv_register_mutex);
804 return rc;
806 EXPORT_SYMBOL(iucv_register);
809 * iucv_unregister
810 * @handler: address of iucv handler structure
811 * @smp: != 0 indicates that the handler can deal with out of order messages
813 * Unregister driver from IUCV.
815 void iucv_unregister(struct iucv_handler *handler, int smp)
817 struct iucv_path *p, *n;
819 mutex_lock(&iucv_register_mutex);
820 spin_lock_bh(&iucv_table_lock);
821 /* Remove handler from the iucv_handler_list. */
822 list_del_init(&handler->list);
823 /* Sever all pathids still referring to the handler. */
824 list_for_each_entry_safe(p, n, &handler->paths, list) {
825 iucv_sever_pathid(p->pathid, NULL);
826 iucv_path_table[p->pathid] = NULL;
827 list_del(&p->list);
828 iucv_path_free(p);
830 spin_unlock_bh(&iucv_table_lock);
831 if (!smp)
832 iucv_nonsmp_handler--;
833 if (list_empty(&iucv_handler_list))
834 iucv_disable();
835 else if (!smp && iucv_nonsmp_handler == 0)
836 iucv_setmask_mp();
837 mutex_unlock(&iucv_register_mutex);
839 EXPORT_SYMBOL(iucv_unregister);
841 static int iucv_reboot_event(struct notifier_block *this,
842 unsigned long event, void *ptr)
844 int i;
846 if (cpumask_empty(&iucv_irq_cpumask))
847 return NOTIFY_DONE;
849 get_online_cpus();
850 on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
851 preempt_disable();
852 for (i = 0; i < iucv_max_pathid; i++) {
853 if (iucv_path_table[i])
854 iucv_sever_pathid(i, NULL);
856 preempt_enable();
857 put_online_cpus();
858 iucv_disable();
859 return NOTIFY_DONE;
862 static struct notifier_block iucv_reboot_notifier = {
863 .notifier_call = iucv_reboot_event,
867 * iucv_path_accept
868 * @path: address of iucv path structure
869 * @handler: address of iucv handler structure
870 * @userdata: 16 bytes of data reflected to the communication partner
871 * @private: private data passed to interrupt handlers for this path
873 * This function is issued after the user received a connection pending
874 * external interrupt and now wishes to complete the IUCV communication path.
876 * Returns the result of the CP IUCV call.
878 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
879 u8 userdata[16], void *private)
881 union iucv_param *parm;
882 int rc;
884 local_bh_disable();
885 if (cpumask_empty(&iucv_buffer_cpumask)) {
886 rc = -EIO;
887 goto out;
889 /* Prepare parameter block. */
890 parm = iucv_param[smp_processor_id()];
891 memset(parm, 0, sizeof(union iucv_param));
892 parm->ctrl.ippathid = path->pathid;
893 parm->ctrl.ipmsglim = path->msglim;
894 if (userdata)
895 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
896 parm->ctrl.ipflags1 = path->flags;
898 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
899 if (!rc) {
900 path->private = private;
901 path->msglim = parm->ctrl.ipmsglim;
902 path->flags = parm->ctrl.ipflags1;
904 out:
905 local_bh_enable();
906 return rc;
908 EXPORT_SYMBOL(iucv_path_accept);
911 * iucv_path_connect
912 * @path: address of iucv path structure
913 * @handler: address of iucv handler structure
914 * @userid: 8-byte user identification
915 * @system: 8-byte target system identification
916 * @userdata: 16 bytes of data reflected to the communication partner
917 * @private: private data passed to interrupt handlers for this path
919 * This function establishes an IUCV path. Although the connect may complete
920 * successfully, you are not able to use the path until you receive an IUCV
921 * Connection Complete external interrupt.
923 * Returns the result of the CP IUCV call.
925 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
926 u8 userid[8], u8 system[8], u8 userdata[16],
927 void *private)
929 union iucv_param *parm;
930 int rc;
932 spin_lock_bh(&iucv_table_lock);
933 iucv_cleanup_queue();
934 if (cpumask_empty(&iucv_buffer_cpumask)) {
935 rc = -EIO;
936 goto out;
938 parm = iucv_param[smp_processor_id()];
939 memset(parm, 0, sizeof(union iucv_param));
940 parm->ctrl.ipmsglim = path->msglim;
941 parm->ctrl.ipflags1 = path->flags;
942 if (userid) {
943 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
944 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
945 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
947 if (system) {
948 memcpy(parm->ctrl.iptarget, system,
949 sizeof(parm->ctrl.iptarget));
950 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
951 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
953 if (userdata)
954 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
956 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
957 if (!rc) {
958 if (parm->ctrl.ippathid < iucv_max_pathid) {
959 path->pathid = parm->ctrl.ippathid;
960 path->msglim = parm->ctrl.ipmsglim;
961 path->flags = parm->ctrl.ipflags1;
962 path->handler = handler;
963 path->private = private;
964 list_add_tail(&path->list, &handler->paths);
965 iucv_path_table[path->pathid] = path;
966 } else {
967 iucv_sever_pathid(parm->ctrl.ippathid,
968 iucv_error_pathid);
969 rc = -EIO;
972 out:
973 spin_unlock_bh(&iucv_table_lock);
974 return rc;
976 EXPORT_SYMBOL(iucv_path_connect);
979 * iucv_path_quiesce:
980 * @path: address of iucv path structure
981 * @userdata: 16 bytes of data reflected to the communication partner
983 * This function temporarily suspends incoming messages on an IUCV path.
984 * You can later reactivate the path by invoking the iucv_resume function.
986 * Returns the result from the CP IUCV call.
988 int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
990 union iucv_param *parm;
991 int rc;
993 local_bh_disable();
994 if (cpumask_empty(&iucv_buffer_cpumask)) {
995 rc = -EIO;
996 goto out;
998 parm = iucv_param[smp_processor_id()];
999 memset(parm, 0, sizeof(union iucv_param));
1000 if (userdata)
1001 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1002 parm->ctrl.ippathid = path->pathid;
1003 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
1004 out:
1005 local_bh_enable();
1006 return rc;
1008 EXPORT_SYMBOL(iucv_path_quiesce);
1011 * iucv_path_resume:
1012 * @path: address of iucv path structure
1013 * @userdata: 16 bytes of data reflected to the communication partner
1015 * This function resumes incoming messages on an IUCV path that has
1016 * been stopped with iucv_path_quiesce.
1018 * Returns the result from the CP IUCV call.
1020 int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
1022 union iucv_param *parm;
1023 int rc;
1025 local_bh_disable();
1026 if (cpumask_empty(&iucv_buffer_cpumask)) {
1027 rc = -EIO;
1028 goto out;
1030 parm = iucv_param[smp_processor_id()];
1031 memset(parm, 0, sizeof(union iucv_param));
1032 if (userdata)
1033 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1034 parm->ctrl.ippathid = path->pathid;
1035 rc = iucv_call_b2f0(IUCV_RESUME, parm);
1036 out:
1037 local_bh_enable();
1038 return rc;
1042 * iucv_path_sever
1043 * @path: address of iucv path structure
1044 * @userdata: 16 bytes of data reflected to the communication partner
1046 * This function terminates an IUCV path.
1048 * Returns the result from the CP IUCV call.
1050 int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
1052 int rc;
1054 preempt_disable();
1055 if (cpumask_empty(&iucv_buffer_cpumask)) {
1056 rc = -EIO;
1057 goto out;
1059 if (iucv_active_cpu != smp_processor_id())
1060 spin_lock_bh(&iucv_table_lock);
1061 rc = iucv_sever_pathid(path->pathid, userdata);
1062 iucv_path_table[path->pathid] = NULL;
1063 list_del_init(&path->list);
1064 if (iucv_active_cpu != smp_processor_id())
1065 spin_unlock_bh(&iucv_table_lock);
1066 out:
1067 preempt_enable();
1068 return rc;
1070 EXPORT_SYMBOL(iucv_path_sever);
1073 * iucv_message_purge
1074 * @path: address of iucv path structure
1075 * @msg: address of iucv msg structure
1076 * @srccls: source class of message
1078 * Cancels a message you have sent.
1080 * Returns the result from the CP IUCV call.
1082 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1083 u32 srccls)
1085 union iucv_param *parm;
1086 int rc;
1088 local_bh_disable();
1089 if (cpumask_empty(&iucv_buffer_cpumask)) {
1090 rc = -EIO;
1091 goto out;
1093 parm = iucv_param[smp_processor_id()];
1094 memset(parm, 0, sizeof(union iucv_param));
1095 parm->purge.ippathid = path->pathid;
1096 parm->purge.ipmsgid = msg->id;
1097 parm->purge.ipsrccls = srccls;
1098 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1099 rc = iucv_call_b2f0(IUCV_PURGE, parm);
1100 if (!rc) {
1101 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1102 msg->tag = parm->purge.ipmsgtag;
1104 out:
1105 local_bh_enable();
1106 return rc;
1108 EXPORT_SYMBOL(iucv_message_purge);
1111 * iucv_message_receive_iprmdata
1112 * @path: address of iucv path structure
1113 * @msg: address of iucv msg structure
1114 * @flags: how the message is received (IUCV_IPBUFLST)
1115 * @buffer: address of data buffer or address of struct iucv_array
1116 * @size: length of data buffer
1117 * @residual:
1119 * Internal function used by iucv_message_receive and __iucv_message_receive
1120 * to receive RMDATA data stored in struct iucv_message.
1122 static int iucv_message_receive_iprmdata(struct iucv_path *path,
1123 struct iucv_message *msg,
1124 u8 flags, void *buffer,
1125 size_t size, size_t *residual)
1127 struct iucv_array *array;
1128 u8 *rmmsg;
1129 size_t copy;
1132 * Message is 8 bytes long and has been stored to the
1133 * message descriptor itself.
1135 if (residual)
1136 *residual = abs(size - 8);
1137 rmmsg = msg->rmmsg;
1138 if (flags & IUCV_IPBUFLST) {
1139 /* Copy to struct iucv_array. */
1140 size = (size < 8) ? size : 8;
1141 for (array = buffer; size > 0; array++) {
1142 copy = min_t(size_t, size, array->length);
1143 memcpy((u8 *)(addr_t) array->address,
1144 rmmsg, copy);
1145 rmmsg += copy;
1146 size -= copy;
1148 } else {
1149 /* Copy to direct buffer. */
1150 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1152 return 0;
1156 * __iucv_message_receive
1157 * @path: address of iucv path structure
1158 * @msg: address of iucv msg structure
1159 * @flags: how the message is received (IUCV_IPBUFLST)
1160 * @buffer: address of data buffer or address of struct iucv_array
1161 * @size: length of data buffer
1162 * @residual:
1164 * This function receives messages that are being sent to you over
1165 * established paths. This function will deal with RMDATA messages
1166 * embedded in struct iucv_message as well.
1168 * Locking: no locking
1170 * Returns the result from the CP IUCV call.
1172 int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1173 u8 flags, void *buffer, size_t size, size_t *residual)
1175 union iucv_param *parm;
1176 int rc;
1178 if (msg->flags & IUCV_IPRMDATA)
1179 return iucv_message_receive_iprmdata(path, msg, flags,
1180 buffer, size, residual);
1181 if (cpumask_empty(&iucv_buffer_cpumask)) {
1182 rc = -EIO;
1183 goto out;
1185 parm = iucv_param[smp_processor_id()];
1186 memset(parm, 0, sizeof(union iucv_param));
1187 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1188 parm->db.ipbfln1f = (u32) size;
1189 parm->db.ipmsgid = msg->id;
1190 parm->db.ippathid = path->pathid;
1191 parm->db.iptrgcls = msg->class;
1192 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1193 IUCV_IPFGMID | IUCV_IPTRGCLS);
1194 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1195 if (!rc || rc == 5) {
1196 msg->flags = parm->db.ipflags1;
1197 if (residual)
1198 *residual = parm->db.ipbfln1f;
1200 out:
1201 return rc;
1203 EXPORT_SYMBOL(__iucv_message_receive);
1206 * iucv_message_receive
1207 * @path: address of iucv path structure
1208 * @msg: address of iucv msg structure
1209 * @flags: how the message is received (IUCV_IPBUFLST)
1210 * @buffer: address of data buffer or address of struct iucv_array
1211 * @size: length of data buffer
1212 * @residual:
1214 * This function receives messages that are being sent to you over
1215 * established paths. This function will deal with RMDATA messages
1216 * embedded in struct iucv_message as well.
1218 * Locking: local_bh_enable/local_bh_disable
1220 * Returns the result from the CP IUCV call.
1222 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1223 u8 flags, void *buffer, size_t size, size_t *residual)
1225 int rc;
1227 if (msg->flags & IUCV_IPRMDATA)
1228 return iucv_message_receive_iprmdata(path, msg, flags,
1229 buffer, size, residual);
1230 local_bh_disable();
1231 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1232 local_bh_enable();
1233 return rc;
1235 EXPORT_SYMBOL(iucv_message_receive);
1238 * iucv_message_reject
1239 * @path: address of iucv path structure
1240 * @msg: address of iucv msg structure
1242 * The reject function refuses a specified message. Between the time you
1243 * are notified of a message and the time that you complete the message,
1244 * the message may be rejected.
1246 * Returns the result from the CP IUCV call.
1248 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1250 union iucv_param *parm;
1251 int rc;
1253 local_bh_disable();
1254 if (cpumask_empty(&iucv_buffer_cpumask)) {
1255 rc = -EIO;
1256 goto out;
1258 parm = iucv_param[smp_processor_id()];
1259 memset(parm, 0, sizeof(union iucv_param));
1260 parm->db.ippathid = path->pathid;
1261 parm->db.ipmsgid = msg->id;
1262 parm->db.iptrgcls = msg->class;
1263 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1264 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1265 out:
1266 local_bh_enable();
1267 return rc;
1269 EXPORT_SYMBOL(iucv_message_reject);
1272 * iucv_message_reply
1273 * @path: address of iucv path structure
1274 * @msg: address of iucv msg structure
1275 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1276 * @reply: address of reply data buffer or address of struct iucv_array
1277 * @size: length of reply data buffer
1279 * This function responds to the two-way messages that you receive. You
1280 * must identify completely the message to which you wish to reply. ie,
1281 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1282 * the parameter list.
1284 * Returns the result from the CP IUCV call.
1286 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1287 u8 flags, void *reply, size_t size)
1289 union iucv_param *parm;
1290 int rc;
1292 local_bh_disable();
1293 if (cpumask_empty(&iucv_buffer_cpumask)) {
1294 rc = -EIO;
1295 goto out;
1297 parm = iucv_param[smp_processor_id()];
1298 memset(parm, 0, sizeof(union iucv_param));
1299 if (flags & IUCV_IPRMDATA) {
1300 parm->dpl.ippathid = path->pathid;
1301 parm->dpl.ipflags1 = flags;
1302 parm->dpl.ipmsgid = msg->id;
1303 parm->dpl.iptrgcls = msg->class;
1304 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1305 } else {
1306 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1307 parm->db.ipbfln1f = (u32) size;
1308 parm->db.ippathid = path->pathid;
1309 parm->db.ipflags1 = flags;
1310 parm->db.ipmsgid = msg->id;
1311 parm->db.iptrgcls = msg->class;
1313 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1314 out:
1315 local_bh_enable();
1316 return rc;
1318 EXPORT_SYMBOL(iucv_message_reply);
1321 * __iucv_message_send
1322 * @path: address of iucv path structure
1323 * @msg: address of iucv msg structure
1324 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1325 * @srccls: source class of message
1326 * @buffer: address of send buffer or address of struct iucv_array
1327 * @size: length of send buffer
1329 * This function transmits data to another application. Data to be
1330 * transmitted is in a buffer and this is a one-way message and the
1331 * receiver will not reply to the message.
1333 * Locking: no locking
1335 * Returns the result from the CP IUCV call.
1337 int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1338 u8 flags, u32 srccls, void *buffer, size_t size)
1340 union iucv_param *parm;
1341 int rc;
1343 if (cpumask_empty(&iucv_buffer_cpumask)) {
1344 rc = -EIO;
1345 goto out;
1347 parm = iucv_param[smp_processor_id()];
1348 memset(parm, 0, sizeof(union iucv_param));
1349 if (flags & IUCV_IPRMDATA) {
1350 /* Message of 8 bytes can be placed into the parameter list. */
1351 parm->dpl.ippathid = path->pathid;
1352 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1353 parm->dpl.iptrgcls = msg->class;
1354 parm->dpl.ipsrccls = srccls;
1355 parm->dpl.ipmsgtag = msg->tag;
1356 memcpy(parm->dpl.iprmmsg, buffer, 8);
1357 } else {
1358 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1359 parm->db.ipbfln1f = (u32) size;
1360 parm->db.ippathid = path->pathid;
1361 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1362 parm->db.iptrgcls = msg->class;
1363 parm->db.ipsrccls = srccls;
1364 parm->db.ipmsgtag = msg->tag;
1366 rc = iucv_call_b2f0(IUCV_SEND, parm);
1367 if (!rc)
1368 msg->id = parm->db.ipmsgid;
1369 out:
1370 return rc;
1372 EXPORT_SYMBOL(__iucv_message_send);
1375 * iucv_message_send
1376 * @path: address of iucv path structure
1377 * @msg: address of iucv msg structure
1378 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1379 * @srccls: source class of message
1380 * @buffer: address of send buffer or address of struct iucv_array
1381 * @size: length of send buffer
1383 * This function transmits data to another application. Data to be
1384 * transmitted is in a buffer and this is a one-way message and the
1385 * receiver will not reply to the message.
1387 * Locking: local_bh_enable/local_bh_disable
1389 * Returns the result from the CP IUCV call.
1391 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1392 u8 flags, u32 srccls, void *buffer, size_t size)
1394 int rc;
1396 local_bh_disable();
1397 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1398 local_bh_enable();
1399 return rc;
1401 EXPORT_SYMBOL(iucv_message_send);
1404 * iucv_message_send2way
1405 * @path: address of iucv path structure
1406 * @msg: address of iucv msg structure
1407 * @flags: how the message is sent and the reply is received
1408 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1409 * @srccls: source class of message
1410 * @buffer: address of send buffer or address of struct iucv_array
1411 * @size: length of send buffer
1412 * @ansbuf: address of answer buffer or address of struct iucv_array
1413 * @asize: size of reply buffer
1415 * This function transmits data to another application. Data to be
1416 * transmitted is in a buffer. The receiver of the send is expected to
1417 * reply to the message and a buffer is provided into which IUCV moves
1418 * the reply to this message.
1420 * Returns the result from the CP IUCV call.
1422 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1423 u8 flags, u32 srccls, void *buffer, size_t size,
1424 void *answer, size_t asize, size_t *residual)
1426 union iucv_param *parm;
1427 int rc;
1429 local_bh_disable();
1430 if (cpumask_empty(&iucv_buffer_cpumask)) {
1431 rc = -EIO;
1432 goto out;
1434 parm = iucv_param[smp_processor_id()];
1435 memset(parm, 0, sizeof(union iucv_param));
1436 if (flags & IUCV_IPRMDATA) {
1437 parm->dpl.ippathid = path->pathid;
1438 parm->dpl.ipflags1 = path->flags; /* priority message */
1439 parm->dpl.iptrgcls = msg->class;
1440 parm->dpl.ipsrccls = srccls;
1441 parm->dpl.ipmsgtag = msg->tag;
1442 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1443 parm->dpl.ipbfln2f = (u32) asize;
1444 memcpy(parm->dpl.iprmmsg, buffer, 8);
1445 } else {
1446 parm->db.ippathid = path->pathid;
1447 parm->db.ipflags1 = path->flags; /* priority message */
1448 parm->db.iptrgcls = msg->class;
1449 parm->db.ipsrccls = srccls;
1450 parm->db.ipmsgtag = msg->tag;
1451 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1452 parm->db.ipbfln1f = (u32) size;
1453 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1454 parm->db.ipbfln2f = (u32) asize;
1456 rc = iucv_call_b2f0(IUCV_SEND, parm);
1457 if (!rc)
1458 msg->id = parm->db.ipmsgid;
1459 out:
1460 local_bh_enable();
1461 return rc;
1463 EXPORT_SYMBOL(iucv_message_send2way);
1466 * iucv_path_pending
1467 * @data: Pointer to external interrupt buffer
1469 * Process connection pending work item. Called from tasklet while holding
1470 * iucv_table_lock.
1472 struct iucv_path_pending {
1473 u16 ippathid;
1474 u8 ipflags1;
1475 u8 iptype;
1476 u16 ipmsglim;
1477 u16 res1;
1478 u8 ipvmid[8];
1479 u8 ipuser[16];
1480 u32 res3;
1481 u8 ippollfg;
1482 u8 res4[3];
1483 } __packed;
1485 static void iucv_path_pending(struct iucv_irq_data *data)
1487 struct iucv_path_pending *ipp = (void *) data;
1488 struct iucv_handler *handler;
1489 struct iucv_path *path;
1490 char *error;
1492 BUG_ON(iucv_path_table[ipp->ippathid]);
1493 /* New pathid, handler found. Create a new path struct. */
1494 error = iucv_error_no_memory;
1495 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1496 if (!path)
1497 goto out_sever;
1498 path->pathid = ipp->ippathid;
1499 iucv_path_table[path->pathid] = path;
1500 EBCASC(ipp->ipvmid, 8);
1502 /* Call registered handler until one is found that wants the path. */
1503 list_for_each_entry(handler, &iucv_handler_list, list) {
1504 if (!handler->path_pending)
1505 continue;
1507 * Add path to handler to allow a call to iucv_path_sever
1508 * inside the path_pending function. If the handler returns
1509 * an error remove the path from the handler again.
1511 list_add(&path->list, &handler->paths);
1512 path->handler = handler;
1513 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1514 return;
1515 list_del(&path->list);
1516 path->handler = NULL;
1518 /* No handler wanted the path. */
1519 iucv_path_table[path->pathid] = NULL;
1520 iucv_path_free(path);
1521 error = iucv_error_no_listener;
1522 out_sever:
1523 iucv_sever_pathid(ipp->ippathid, error);
1527 * iucv_path_complete
1528 * @data: Pointer to external interrupt buffer
1530 * Process connection complete work item. Called from tasklet while holding
1531 * iucv_table_lock.
1533 struct iucv_path_complete {
1534 u16 ippathid;
1535 u8 ipflags1;
1536 u8 iptype;
1537 u16 ipmsglim;
1538 u16 res1;
1539 u8 res2[8];
1540 u8 ipuser[16];
1541 u32 res3;
1542 u8 ippollfg;
1543 u8 res4[3];
1544 } __packed;
1546 static void iucv_path_complete(struct iucv_irq_data *data)
1548 struct iucv_path_complete *ipc = (void *) data;
1549 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1551 if (path)
1552 path->flags = ipc->ipflags1;
1553 if (path && path->handler && path->handler->path_complete)
1554 path->handler->path_complete(path, ipc->ipuser);
1558 * iucv_path_severed
1559 * @data: Pointer to external interrupt buffer
1561 * Process connection severed work item. Called from tasklet while holding
1562 * iucv_table_lock.
1564 struct iucv_path_severed {
1565 u16 ippathid;
1566 u8 res1;
1567 u8 iptype;
1568 u32 res2;
1569 u8 res3[8];
1570 u8 ipuser[16];
1571 u32 res4;
1572 u8 ippollfg;
1573 u8 res5[3];
1574 } __packed;
1576 static void iucv_path_severed(struct iucv_irq_data *data)
1578 struct iucv_path_severed *ips = (void *) data;
1579 struct iucv_path *path = iucv_path_table[ips->ippathid];
1581 if (!path || !path->handler) /* Already severed */
1582 return;
1583 if (path->handler->path_severed)
1584 path->handler->path_severed(path, ips->ipuser);
1585 else {
1586 iucv_sever_pathid(path->pathid, NULL);
1587 iucv_path_table[path->pathid] = NULL;
1588 list_del(&path->list);
1589 iucv_path_free(path);
1594 * iucv_path_quiesced
1595 * @data: Pointer to external interrupt buffer
1597 * Process connection quiesced work item. Called from tasklet while holding
1598 * iucv_table_lock.
1600 struct iucv_path_quiesced {
1601 u16 ippathid;
1602 u8 res1;
1603 u8 iptype;
1604 u32 res2;
1605 u8 res3[8];
1606 u8 ipuser[16];
1607 u32 res4;
1608 u8 ippollfg;
1609 u8 res5[3];
1610 } __packed;
1612 static void iucv_path_quiesced(struct iucv_irq_data *data)
1614 struct iucv_path_quiesced *ipq = (void *) data;
1615 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1617 if (path && path->handler && path->handler->path_quiesced)
1618 path->handler->path_quiesced(path, ipq->ipuser);
1622 * iucv_path_resumed
1623 * @data: Pointer to external interrupt buffer
1625 * Process connection resumed work item. Called from tasklet while holding
1626 * iucv_table_lock.
1628 struct iucv_path_resumed {
1629 u16 ippathid;
1630 u8 res1;
1631 u8 iptype;
1632 u32 res2;
1633 u8 res3[8];
1634 u8 ipuser[16];
1635 u32 res4;
1636 u8 ippollfg;
1637 u8 res5[3];
1638 } __packed;
1640 static void iucv_path_resumed(struct iucv_irq_data *data)
1642 struct iucv_path_resumed *ipr = (void *) data;
1643 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1645 if (path && path->handler && path->handler->path_resumed)
1646 path->handler->path_resumed(path, ipr->ipuser);
1650 * iucv_message_complete
1651 * @data: Pointer to external interrupt buffer
1653 * Process message complete work item. Called from tasklet while holding
1654 * iucv_table_lock.
1656 struct iucv_message_complete {
1657 u16 ippathid;
1658 u8 ipflags1;
1659 u8 iptype;
1660 u32 ipmsgid;
1661 u32 ipaudit;
1662 u8 iprmmsg[8];
1663 u32 ipsrccls;
1664 u32 ipmsgtag;
1665 u32 res;
1666 u32 ipbfln2f;
1667 u8 ippollfg;
1668 u8 res2[3];
1669 } __packed;
1671 static void iucv_message_complete(struct iucv_irq_data *data)
1673 struct iucv_message_complete *imc = (void *) data;
1674 struct iucv_path *path = iucv_path_table[imc->ippathid];
1675 struct iucv_message msg;
1677 if (path && path->handler && path->handler->message_complete) {
1678 msg.flags = imc->ipflags1;
1679 msg.id = imc->ipmsgid;
1680 msg.audit = imc->ipaudit;
1681 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1682 msg.class = imc->ipsrccls;
1683 msg.tag = imc->ipmsgtag;
1684 msg.length = imc->ipbfln2f;
1685 path->handler->message_complete(path, &msg);
1690 * iucv_message_pending
1691 * @data: Pointer to external interrupt buffer
1693 * Process message pending work item. Called from tasklet while holding
1694 * iucv_table_lock.
1696 struct iucv_message_pending {
1697 u16 ippathid;
1698 u8 ipflags1;
1699 u8 iptype;
1700 u32 ipmsgid;
1701 u32 iptrgcls;
1702 union {
1703 u32 iprmmsg1_u32;
1704 u8 iprmmsg1[4];
1705 } ln1msg1;
1706 union {
1707 u32 ipbfln1f;
1708 u8 iprmmsg2[4];
1709 } ln1msg2;
1710 u32 res1[3];
1711 u32 ipbfln2f;
1712 u8 ippollfg;
1713 u8 res2[3];
1714 } __packed;
1716 static void iucv_message_pending(struct iucv_irq_data *data)
1718 struct iucv_message_pending *imp = (void *) data;
1719 struct iucv_path *path = iucv_path_table[imp->ippathid];
1720 struct iucv_message msg;
1722 if (path && path->handler && path->handler->message_pending) {
1723 msg.flags = imp->ipflags1;
1724 msg.id = imp->ipmsgid;
1725 msg.class = imp->iptrgcls;
1726 if (imp->ipflags1 & IUCV_IPRMDATA) {
1727 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1728 msg.length = 8;
1729 } else
1730 msg.length = imp->ln1msg2.ipbfln1f;
1731 msg.reply_size = imp->ipbfln2f;
1732 path->handler->message_pending(path, &msg);
1737 * iucv_tasklet_fn:
1739 * This tasklet loops over the queue of irq buffers created by
1740 * iucv_external_interrupt, calls the appropriate action handler
1741 * and then frees the buffer.
1743 static void iucv_tasklet_fn(unsigned long ignored)
1745 typedef void iucv_irq_fn(struct iucv_irq_data *);
1746 static iucv_irq_fn *irq_fn[] = {
1747 [0x02] = iucv_path_complete,
1748 [0x03] = iucv_path_severed,
1749 [0x04] = iucv_path_quiesced,
1750 [0x05] = iucv_path_resumed,
1751 [0x06] = iucv_message_complete,
1752 [0x07] = iucv_message_complete,
1753 [0x08] = iucv_message_pending,
1754 [0x09] = iucv_message_pending,
1756 LIST_HEAD(task_queue);
1757 struct iucv_irq_list *p, *n;
1759 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1760 if (!spin_trylock(&iucv_table_lock)) {
1761 tasklet_schedule(&iucv_tasklet);
1762 return;
1764 iucv_active_cpu = smp_processor_id();
1766 spin_lock_irq(&iucv_queue_lock);
1767 list_splice_init(&iucv_task_queue, &task_queue);
1768 spin_unlock_irq(&iucv_queue_lock);
1770 list_for_each_entry_safe(p, n, &task_queue, list) {
1771 list_del_init(&p->list);
1772 irq_fn[p->data.iptype](&p->data);
1773 kfree(p);
1776 iucv_active_cpu = -1;
1777 spin_unlock(&iucv_table_lock);
1781 * iucv_work_fn:
1783 * This work function loops over the queue of path pending irq blocks
1784 * created by iucv_external_interrupt, calls the appropriate action
1785 * handler and then frees the buffer.
1787 static void iucv_work_fn(struct work_struct *work)
1789 LIST_HEAD(work_queue);
1790 struct iucv_irq_list *p, *n;
1792 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1793 spin_lock_bh(&iucv_table_lock);
1794 iucv_active_cpu = smp_processor_id();
1796 spin_lock_irq(&iucv_queue_lock);
1797 list_splice_init(&iucv_work_queue, &work_queue);
1798 spin_unlock_irq(&iucv_queue_lock);
1800 iucv_cleanup_queue();
1801 list_for_each_entry_safe(p, n, &work_queue, list) {
1802 list_del_init(&p->list);
1803 iucv_path_pending(&p->data);
1804 kfree(p);
1807 iucv_active_cpu = -1;
1808 spin_unlock_bh(&iucv_table_lock);
1812 * iucv_external_interrupt
1813 * @code: irq code
1815 * Handles external interrupts coming in from CP.
1816 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1818 static void iucv_external_interrupt(struct ext_code ext_code,
1819 unsigned int param32, unsigned long param64)
1821 struct iucv_irq_data *p;
1822 struct iucv_irq_list *work;
1824 inc_irq_stat(IRQEXT_IUC);
1825 p = iucv_irq_data[smp_processor_id()];
1826 if (p->ippathid >= iucv_max_pathid) {
1827 WARN_ON(p->ippathid >= iucv_max_pathid);
1828 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1829 return;
1831 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
1832 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1833 if (!work) {
1834 pr_warning("iucv_external_interrupt: out of memory\n");
1835 return;
1837 memcpy(&work->data, p, sizeof(work->data));
1838 spin_lock(&iucv_queue_lock);
1839 if (p->iptype == 0x01) {
1840 /* Path pending interrupt. */
1841 list_add_tail(&work->list, &iucv_work_queue);
1842 schedule_work(&iucv_work);
1843 } else {
1844 /* The other interrupts. */
1845 list_add_tail(&work->list, &iucv_task_queue);
1846 tasklet_schedule(&iucv_tasklet);
1848 spin_unlock(&iucv_queue_lock);
1851 static int iucv_pm_prepare(struct device *dev)
1853 int rc = 0;
1855 #ifdef CONFIG_PM_DEBUG
1856 printk(KERN_INFO "iucv_pm_prepare\n");
1857 #endif
1858 if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1859 rc = dev->driver->pm->prepare(dev);
1860 return rc;
1863 static void iucv_pm_complete(struct device *dev)
1865 #ifdef CONFIG_PM_DEBUG
1866 printk(KERN_INFO "iucv_pm_complete\n");
1867 #endif
1868 if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1869 dev->driver->pm->complete(dev);
1873 * iucv_path_table_empty() - determine if iucv path table is empty
1875 * Returns 0 if there are still iucv pathes defined
1876 * 1 if there are no iucv pathes defined
1878 int iucv_path_table_empty(void)
1880 int i;
1882 for (i = 0; i < iucv_max_pathid; i++) {
1883 if (iucv_path_table[i])
1884 return 0;
1886 return 1;
1890 * iucv_pm_freeze() - Freeze PM callback
1891 * @dev: iucv-based device
1893 * disable iucv interrupts
1894 * invoke callback function of the iucv-based driver
1895 * shut down iucv, if no iucv-pathes are established anymore
1897 static int iucv_pm_freeze(struct device *dev)
1899 int cpu;
1900 struct iucv_irq_list *p, *n;
1901 int rc = 0;
1903 #ifdef CONFIG_PM_DEBUG
1904 printk(KERN_WARNING "iucv_pm_freeze\n");
1905 #endif
1906 if (iucv_pm_state != IUCV_PM_FREEZING) {
1907 for_each_cpu(cpu, &iucv_irq_cpumask)
1908 smp_call_function_single(cpu, iucv_block_cpu_almost,
1909 NULL, 1);
1910 cancel_work_sync(&iucv_work);
1911 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1912 list_del_init(&p->list);
1913 iucv_sever_pathid(p->data.ippathid,
1914 iucv_error_no_listener);
1915 kfree(p);
1918 iucv_pm_state = IUCV_PM_FREEZING;
1919 if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1920 rc = dev->driver->pm->freeze(dev);
1921 if (iucv_path_table_empty())
1922 iucv_disable();
1923 return rc;
1927 * iucv_pm_thaw() - Thaw PM callback
1928 * @dev: iucv-based device
1930 * make iucv ready for use again: allocate path table, declare interrupt buffers
1931 * and enable iucv interrupts
1932 * invoke callback function of the iucv-based driver
1934 static int iucv_pm_thaw(struct device *dev)
1936 int rc = 0;
1938 #ifdef CONFIG_PM_DEBUG
1939 printk(KERN_WARNING "iucv_pm_thaw\n");
1940 #endif
1941 iucv_pm_state = IUCV_PM_THAWING;
1942 if (!iucv_path_table) {
1943 rc = iucv_enable();
1944 if (rc)
1945 goto out;
1947 if (cpumask_empty(&iucv_irq_cpumask)) {
1948 if (iucv_nonsmp_handler)
1949 /* enable interrupts on one cpu */
1950 iucv_allow_cpu(NULL);
1951 else
1952 /* enable interrupts on all cpus */
1953 iucv_setmask_mp();
1955 if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1956 rc = dev->driver->pm->thaw(dev);
1957 out:
1958 return rc;
1962 * iucv_pm_restore() - Restore PM callback
1963 * @dev: iucv-based device
1965 * make iucv ready for use again: allocate path table, declare interrupt buffers
1966 * and enable iucv interrupts
1967 * invoke callback function of the iucv-based driver
1969 static int iucv_pm_restore(struct device *dev)
1971 int rc = 0;
1973 #ifdef CONFIG_PM_DEBUG
1974 printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1975 #endif
1976 if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1977 pr_warning("Suspending Linux did not completely close all IUCV "
1978 "connections\n");
1979 iucv_pm_state = IUCV_PM_RESTORING;
1980 if (cpumask_empty(&iucv_irq_cpumask)) {
1981 rc = iucv_query_maxconn();
1982 rc = iucv_enable();
1983 if (rc)
1984 goto out;
1986 if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1987 rc = dev->driver->pm->restore(dev);
1988 out:
1989 return rc;
1992 struct iucv_interface iucv_if = {
1993 .message_receive = iucv_message_receive,
1994 .__message_receive = __iucv_message_receive,
1995 .message_reply = iucv_message_reply,
1996 .message_reject = iucv_message_reject,
1997 .message_send = iucv_message_send,
1998 .__message_send = __iucv_message_send,
1999 .message_send2way = iucv_message_send2way,
2000 .message_purge = iucv_message_purge,
2001 .path_accept = iucv_path_accept,
2002 .path_connect = iucv_path_connect,
2003 .path_quiesce = iucv_path_quiesce,
2004 .path_resume = iucv_path_resume,
2005 .path_sever = iucv_path_sever,
2006 .iucv_register = iucv_register,
2007 .iucv_unregister = iucv_unregister,
2008 .bus = NULL,
2009 .root = NULL,
2011 EXPORT_SYMBOL(iucv_if);
2014 * iucv_init
2016 * Allocates and initializes various data structures.
2018 static int __init iucv_init(void)
2020 int rc;
2021 int cpu;
2023 if (!MACHINE_IS_VM) {
2024 rc = -EPROTONOSUPPORT;
2025 goto out;
2027 ctl_set_bit(0, 1);
2028 rc = iucv_query_maxconn();
2029 if (rc)
2030 goto out_ctl;
2031 rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2032 if (rc)
2033 goto out_ctl;
2034 iucv_root = root_device_register("iucv");
2035 if (IS_ERR(iucv_root)) {
2036 rc = PTR_ERR(iucv_root);
2037 goto out_int;
2040 cpu_notifier_register_begin();
2042 for_each_online_cpu(cpu) {
2043 if (alloc_iucv_data(cpu)) {
2044 rc = -ENOMEM;
2045 goto out_free;
2048 rc = __register_hotcpu_notifier(&iucv_cpu_notifier);
2049 if (rc)
2050 goto out_free;
2052 cpu_notifier_register_done();
2054 rc = register_reboot_notifier(&iucv_reboot_notifier);
2055 if (rc)
2056 goto out_cpu;
2057 ASCEBC(iucv_error_no_listener, 16);
2058 ASCEBC(iucv_error_no_memory, 16);
2059 ASCEBC(iucv_error_pathid, 16);
2060 iucv_available = 1;
2061 rc = bus_register(&iucv_bus);
2062 if (rc)
2063 goto out_reboot;
2064 iucv_if.root = iucv_root;
2065 iucv_if.bus = &iucv_bus;
2066 return 0;
2068 out_reboot:
2069 unregister_reboot_notifier(&iucv_reboot_notifier);
2070 out_cpu:
2071 cpu_notifier_register_begin();
2072 __unregister_hotcpu_notifier(&iucv_cpu_notifier);
2073 out_free:
2074 for_each_possible_cpu(cpu)
2075 free_iucv_data(cpu);
2077 cpu_notifier_register_done();
2079 root_device_unregister(iucv_root);
2080 out_int:
2081 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2082 out_ctl:
2083 ctl_clear_bit(0, 1);
2084 out:
2085 return rc;
2089 * iucv_exit
2091 * Frees everything allocated from iucv_init.
2093 static void __exit iucv_exit(void)
2095 struct iucv_irq_list *p, *n;
2096 int cpu;
2098 spin_lock_irq(&iucv_queue_lock);
2099 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2100 kfree(p);
2101 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2102 kfree(p);
2103 spin_unlock_irq(&iucv_queue_lock);
2104 unregister_reboot_notifier(&iucv_reboot_notifier);
2105 cpu_notifier_register_begin();
2106 __unregister_hotcpu_notifier(&iucv_cpu_notifier);
2107 for_each_possible_cpu(cpu)
2108 free_iucv_data(cpu);
2109 cpu_notifier_register_done();
2110 root_device_unregister(iucv_root);
2111 bus_unregister(&iucv_bus);
2112 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2115 subsys_initcall(iucv_init);
2116 module_exit(iucv_exit);
2118 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
2119 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2120 MODULE_LICENSE("GPL");