1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IUCV base infrastructure.
4 *
5 * Copyright IBM Corp. 2001, 2009
6 *
7 * Author(s):
8 * Original source:
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>
15 * PM functions:
16 * Ursula Braun (ursula.braun@de.ibm.com)
17 *
18 * Documentation used:
19 * The original source
20 * CP Programming Service, IBM document # SC24-5760
21 */
22
23 #define KMSG_COMPONENT "iucv"
24 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
25
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>
43 #include <asm/io.h>
44 #include <asm/irq.h>
45 #include <asm/smp.h>
46
47 /*
48 * FLAGS:
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.
57 */
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
64
iucv_bus_match(struct device * dev,struct device_driver * drv)65 static int iucv_bus_match(struct device *dev, struct device_driver *drv)
66 {
67 return 0;
68 }
69
70 struct bus_type iucv_bus = {
71 .name = "iucv",
72 .match = iucv_bus_match,
73 };
74 EXPORT_SYMBOL(iucv_bus);
75
76 struct device *iucv_root;
77 EXPORT_SYMBOL(iucv_root);
78
79 static int iucv_available;
80
81 /* General IUCV interrupt structure */
82 struct iucv_irq_data {
83 u16 ippathid;
84 u8 ipflags1;
85 u8 iptype;
86 u32 res2[8];
87 };
88
89 struct iucv_irq_list {
90 struct list_head list;
91 struct iucv_irq_data data;
92 };
93
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 };
97
98 /*
99 * Queue of interrupt buffers lock for delivery via the tasklet
100 * (fast but can't call smp_call_function).
101 */
102 static LIST_HEAD(iucv_task_queue);
103
104 /*
105 * The tasklet for fast delivery of iucv interrupts.
106 */
107 static void iucv_tasklet_fn(unsigned long);
108 static DECLARE_TASKLET_OLD(iucv_tasklet, iucv_tasklet_fn);
109
110 /*
111 * Queue of interrupt buffers for delivery via a work queue
112 * (slower but can call smp_call_function).
113 */
114 static LIST_HEAD(iucv_work_queue);
115
116 /*
117 * The work element to deliver path pending interrupts.
118 */
119 static void iucv_work_fn(struct work_struct *work);
120 static DECLARE_WORK(iucv_work, iucv_work_fn);
121
122 /*
123 * Spinlock protecting task and work queue.
124 */
125 static DEFINE_SPINLOCK(iucv_queue_lock);
126
127 enum iucv_command_codes {
128 IUCV_QUERY = 0,
129 IUCV_RETRIEVE_BUFFER = 2,
130 IUCV_SEND = 4,
131 IUCV_RECEIVE = 5,
132 IUCV_REPLY = 6,
133 IUCV_REJECT = 8,
134 IUCV_PURGE = 9,
135 IUCV_ACCEPT = 10,
136 IUCV_CONNECT = 11,
137 IUCV_DECLARE_BUFFER = 12,
138 IUCV_QUIESCE = 13,
139 IUCV_RESUME = 14,
140 IUCV_SEVER = 15,
141 IUCV_SETMASK = 16,
142 IUCV_SETCONTROLMASK = 17,
143 };
144
145 /*
146 * Error messages that are used with the iucv_sever function. They get
147 * converted to EBCDIC.
148 */
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";
152
153 /*
154 * iucv_handler_list: List of registered handlers.
155 */
156 static LIST_HEAD(iucv_handler_list);
157
158 /*
159 * iucv_path_table: an array of iucv_path structures.
160 */
161 static struct iucv_path **iucv_path_table;
162 static unsigned long iucv_max_pathid;
163
164 /*
165 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
166 */
167 static DEFINE_SPINLOCK(iucv_table_lock);
168
169 /*
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.
172 */
173 static int iucv_active_cpu = -1;
174
175 /*
176 * Mutex and wait queue for iucv_register/iucv_unregister.
177 */
178 static DEFINE_MUTEX(iucv_register_mutex);
179
180 /*
181 * Counter for number of non-smp capable handlers.
182 */
183 static int iucv_nonsmp_handler;
184
185 /*
186 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
187 * iucv_path_quiesce and iucv_path_sever.
188 */
189 struct iucv_cmd_control {
190 u16 ippathid;
191 u8 ipflags1;
192 u8 iprcode;
193 u16 ipmsglim;
194 u16 res1;
195 u8 ipvmid[8];
196 u8 ipuser[16];
197 u8 iptarget[8];
198 } __attribute__ ((packed,aligned(8)));
199
200 /*
201 * Data in parameter list iucv structure. Used by iucv_message_send,
202 * iucv_message_send2way and iucv_message_reply.
203 */
204 struct iucv_cmd_dpl {
205 u16 ippathid;
206 u8 ipflags1;
207 u8 iprcode;
208 u32 ipmsgid;
209 u32 iptrgcls;
210 u8 iprmmsg[8];
211 u32 ipsrccls;
212 u32 ipmsgtag;
213 u32 ipbfadr2;
214 u32 ipbfln2f;
215 u32 res;
216 } __attribute__ ((packed,aligned(8)));
217
218 /*
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.
222 */
223 struct iucv_cmd_db {
224 u16 ippathid;
225 u8 ipflags1;
226 u8 iprcode;
227 u32 ipmsgid;
228 u32 iptrgcls;
229 u32 ipbfadr1;
230 u32 ipbfln1f;
231 u32 ipsrccls;
232 u32 ipmsgtag;
233 u32 ipbfadr2;
234 u32 ipbfln2f;
235 u32 res;
236 } __attribute__ ((packed,aligned(8)));
237
238 /*
239 * Purge message iucv structure. Used by iucv_message_purge.
240 */
241 struct iucv_cmd_purge {
242 u16 ippathid;
243 u8 ipflags1;
244 u8 iprcode;
245 u32 ipmsgid;
246 u8 ipaudit[3];
247 u8 res1[5];
248 u32 res2;
249 u32 ipsrccls;
250 u32 ipmsgtag;
251 u32 res3[3];
252 } __attribute__ ((packed,aligned(8)));
253
254 /*
255 * Set mask iucv structure. Used by iucv_enable_cpu.
256 */
257 struct iucv_cmd_set_mask {
258 u8 ipmask;
259 u8 res1[2];
260 u8 iprcode;
261 u32 res2[9];
262 } __attribute__ ((packed,aligned(8)));
263
264 union iucv_param {
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;
270 };
271
272 /*
273 * Anchor for per-cpu IUCV command parameter block.
274 */
275 static union iucv_param *iucv_param[NR_CPUS];
276 static union iucv_param *iucv_param_irq[NR_CPUS];
277
278 /**
279 * iucv_call_b2f0
280 * @code: identifier of IUCV call to CP.
281 * @parm: pointer to a struct iucv_parm block
282 *
283 * Calls CP to execute IUCV commands.
284 *
285 * Returns the result of the CP IUCV call.
286 */
__iucv_call_b2f0(int command,union iucv_param * parm)287 static inline int __iucv_call_b2f0(int command, union iucv_param *parm)
288 {
289 register unsigned long reg0 asm ("0");
290 register unsigned long reg1 asm ("1");
291 int ccode;
292
293 reg0 = command;
294 reg1 = (unsigned long)parm;
295 asm volatile(
296 " .long 0xb2f01000\n"
297 " ipm %0\n"
298 " srl %0,28\n"
299 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
300 : "m" (*parm) : "cc");
301 return ccode;
302 }
303
iucv_call_b2f0(int command,union iucv_param * parm)304 static inline int iucv_call_b2f0(int command, union iucv_param *parm)
305 {
306 int ccode;
307
308 ccode = __iucv_call_b2f0(command, parm);
309 return ccode == 1 ? parm->ctrl.iprcode : ccode;
310 }
311
312 /**
313 * iucv_query_maxconn
314 *
315 * Determines the maximum number of connections that may be established.
316 *
317 * Returns the maximum number of connections or -EPERM is IUCV is not
318 * available.
319 */
__iucv_query_maxconn(void * param,unsigned long * max_pathid)320 static int __iucv_query_maxconn(void *param, unsigned long *max_pathid)
321 {
322 register unsigned long reg0 asm ("0");
323 register unsigned long reg1 asm ("1");
324 int ccode;
325
326 reg0 = IUCV_QUERY;
327 reg1 = (unsigned long) param;
328 asm volatile (
329 " .long 0xb2f01000\n"
330 " ipm %0\n"
331 " srl %0,28\n"
332 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
333 *max_pathid = reg1;
334 return ccode;
335 }
336
iucv_query_maxconn(void)337 static int iucv_query_maxconn(void)
338 {
339 unsigned long max_pathid;
340 void *param;
341 int ccode;
342
343 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA);
344 if (!param)
345 return -ENOMEM;
346 ccode = __iucv_query_maxconn(param, &max_pathid);
347 if (ccode == 0)
348 iucv_max_pathid = max_pathid;
349 kfree(param);
350 return ccode ? -EPERM : 0;
351 }
352
353 /**
354 * iucv_allow_cpu
355 * @data: unused
356 *
357 * Allow iucv interrupts on this cpu.
358 */
iucv_allow_cpu(void * data)359 static void iucv_allow_cpu(void *data)
360 {
361 int cpu = smp_processor_id();
362 union iucv_param *parm;
363
364 /*
365 * Enable all iucv interrupts.
366 * ipmask contains bits for the different interrupts
367 * 0x80 - Flag to allow nonpriority message pending interrupts
368 * 0x40 - Flag to allow priority message pending interrupts
369 * 0x20 - Flag to allow nonpriority message completion interrupts
370 * 0x10 - Flag to allow priority message completion interrupts
371 * 0x08 - Flag to allow IUCV control interrupts
372 */
373 parm = iucv_param_irq[cpu];
374 memset(parm, 0, sizeof(union iucv_param));
375 parm->set_mask.ipmask = 0xf8;
376 iucv_call_b2f0(IUCV_SETMASK, parm);
377
378 /*
379 * Enable all iucv control interrupts.
380 * ipmask contains bits for the different interrupts
381 * 0x80 - Flag to allow pending connections interrupts
382 * 0x40 - Flag to allow connection complete interrupts
383 * 0x20 - Flag to allow connection severed interrupts
384 * 0x10 - Flag to allow connection quiesced interrupts
385 * 0x08 - Flag to allow connection resumed interrupts
386 */
387 memset(parm, 0, sizeof(union iucv_param));
388 parm->set_mask.ipmask = 0xf8;
389 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
390 /* Set indication that iucv interrupts are allowed for this cpu. */
391 cpumask_set_cpu(cpu, &iucv_irq_cpumask);
392 }
393
394 /**
395 * iucv_block_cpu
396 * @data: unused
397 *
398 * Block iucv interrupts on this cpu.
399 */
iucv_block_cpu(void * data)400 static void iucv_block_cpu(void *data)
401 {
402 int cpu = smp_processor_id();
403 union iucv_param *parm;
404
405 /* Disable all iucv interrupts. */
406 parm = iucv_param_irq[cpu];
407 memset(parm, 0, sizeof(union iucv_param));
408 iucv_call_b2f0(IUCV_SETMASK, parm);
409
410 /* Clear indication that iucv interrupts are allowed for this cpu. */
411 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
412 }
413
414 /**
415 * iucv_declare_cpu
416 * @data: unused
417 *
418 * Declare a interrupt buffer on this cpu.
419 */
iucv_declare_cpu(void * data)420 static void iucv_declare_cpu(void *data)
421 {
422 int cpu = smp_processor_id();
423 union iucv_param *parm;
424 int rc;
425
426 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
427 return;
428
429 /* Declare interrupt buffer. */
430 parm = iucv_param_irq[cpu];
431 memset(parm, 0, sizeof(union iucv_param));
432 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
433 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
434 if (rc) {
435 char *err = "Unknown";
436 switch (rc) {
437 case 0x03:
438 err = "Directory error";
439 break;
440 case 0x0a:
441 err = "Invalid length";
442 break;
443 case 0x13:
444 err = "Buffer already exists";
445 break;
446 case 0x3e:
447 err = "Buffer overlap";
448 break;
449 case 0x5c:
450 err = "Paging or storage error";
451 break;
452 }
453 pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n",
454 cpu, rc, err);
455 return;
456 }
457
458 /* Set indication that an iucv buffer exists for this cpu. */
459 cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
460
461 if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
462 /* Enable iucv interrupts on this cpu. */
463 iucv_allow_cpu(NULL);
464 else
465 /* Disable iucv interrupts on this cpu. */
466 iucv_block_cpu(NULL);
467 }
468
469 /**
470 * iucv_retrieve_cpu
471 * @data: unused
472 *
473 * Retrieve interrupt buffer on this cpu.
474 */
iucv_retrieve_cpu(void * data)475 static void iucv_retrieve_cpu(void *data)
476 {
477 int cpu = smp_processor_id();
478 union iucv_param *parm;
479
480 if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
481 return;
482
483 /* Block iucv interrupts. */
484 iucv_block_cpu(NULL);
485
486 /* Retrieve interrupt buffer. */
487 parm = iucv_param_irq[cpu];
488 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
489
490 /* Clear indication that an iucv buffer exists for this cpu. */
491 cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
492 }
493
494 /**
495 * iucv_setmask_smp
496 *
497 * Allow iucv interrupts on all cpus.
498 */
iucv_setmask_mp(void)499 static void iucv_setmask_mp(void)
500 {
501 int cpu;
502
503 get_online_cpus();
504 for_each_online_cpu(cpu)
505 /* Enable all cpus with a declared buffer. */
506 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
507 !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
508 smp_call_function_single(cpu, iucv_allow_cpu,
509 NULL, 1);
510 put_online_cpus();
511 }
512
513 /**
514 * iucv_setmask_up
515 *
516 * Allow iucv interrupts on a single cpu.
517 */
iucv_setmask_up(void)518 static void iucv_setmask_up(void)
519 {
520 cpumask_t cpumask;
521 int cpu;
522
523 /* Disable all cpu but the first in cpu_irq_cpumask. */
524 cpumask_copy(&cpumask, &iucv_irq_cpumask);
525 cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
526 for_each_cpu(cpu, &cpumask)
527 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
528 }
529
530 /**
531 * iucv_enable
532 *
533 * This function makes iucv ready for use. It allocates the pathid
534 * table, declares an iucv interrupt buffer and enables the iucv
535 * interrupts. Called when the first user has registered an iucv
536 * handler.
537 */
iucv_enable(void)538 static int iucv_enable(void)
539 {
540 size_t alloc_size;
541 int cpu, rc;
542
543 get_online_cpus();
544 rc = -ENOMEM;
545 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
546 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
547 if (!iucv_path_table)
548 goto out;
549 /* Declare per cpu buffers. */
550 rc = -EIO;
551 for_each_online_cpu(cpu)
552 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
553 if (cpumask_empty(&iucv_buffer_cpumask))
554 /* No cpu could declare an iucv buffer. */
555 goto out;
556 put_online_cpus();
557 return 0;
558 out:
559 kfree(iucv_path_table);
560 iucv_path_table = NULL;
561 put_online_cpus();
562 return rc;
563 }
564
565 /**
566 * iucv_disable
567 *
568 * This function shuts down iucv. It disables iucv interrupts, retrieves
569 * the iucv interrupt buffer and frees the pathid table. Called after the
570 * last user unregister its iucv handler.
571 */
iucv_disable(void)572 static void iucv_disable(void)
573 {
574 get_online_cpus();
575 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
576 kfree(iucv_path_table);
577 iucv_path_table = NULL;
578 put_online_cpus();
579 }
580
iucv_cpu_dead(unsigned int cpu)581 static int iucv_cpu_dead(unsigned int cpu)
582 {
583 kfree(iucv_param_irq[cpu]);
584 iucv_param_irq[cpu] = NULL;
585 kfree(iucv_param[cpu]);
586 iucv_param[cpu] = NULL;
587 kfree(iucv_irq_data[cpu]);
588 iucv_irq_data[cpu] = NULL;
589 return 0;
590 }
591
iucv_cpu_prepare(unsigned int cpu)592 static int iucv_cpu_prepare(unsigned int cpu)
593 {
594 /* Note: GFP_DMA used to get memory below 2G */
595 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
596 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
597 if (!iucv_irq_data[cpu])
598 goto out_free;
599
600 /* Allocate parameter blocks. */
601 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
602 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
603 if (!iucv_param[cpu])
604 goto out_free;
605
606 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
607 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
608 if (!iucv_param_irq[cpu])
609 goto out_free;
610
611 return 0;
612
613 out_free:
614 iucv_cpu_dead(cpu);
615 return -ENOMEM;
616 }
617
iucv_cpu_online(unsigned int cpu)618 static int iucv_cpu_online(unsigned int cpu)
619 {
620 if (!iucv_path_table)
621 return 0;
622 iucv_declare_cpu(NULL);
623 return 0;
624 }
625
iucv_cpu_down_prep(unsigned int cpu)626 static int iucv_cpu_down_prep(unsigned int cpu)
627 {
628 cpumask_t cpumask;
629
630 if (!iucv_path_table)
631 return 0;
632
633 cpumask_copy(&cpumask, &iucv_buffer_cpumask);
634 cpumask_clear_cpu(cpu, &cpumask);
635 if (cpumask_empty(&cpumask))
636 /* Can't offline last IUCV enabled cpu. */
637 return -EINVAL;
638
639 iucv_retrieve_cpu(NULL);
640 if (!cpumask_empty(&iucv_irq_cpumask))
641 return 0;
642 smp_call_function_single(cpumask_first(&iucv_buffer_cpumask),
643 iucv_allow_cpu, NULL, 1);
644 return 0;
645 }
646
647 /**
648 * iucv_sever_pathid
649 * @pathid: path identification number.
650 * @userdata: 16-bytes of user data.
651 *
652 * Sever an iucv path to free up the pathid. Used internally.
653 */
iucv_sever_pathid(u16 pathid,u8 * userdata)654 static int iucv_sever_pathid(u16 pathid, u8 *userdata)
655 {
656 union iucv_param *parm;
657
658 parm = iucv_param_irq[smp_processor_id()];
659 memset(parm, 0, sizeof(union iucv_param));
660 if (userdata)
661 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
662 parm->ctrl.ippathid = pathid;
663 return iucv_call_b2f0(IUCV_SEVER, parm);
664 }
665
666 /**
667 * __iucv_cleanup_queue
668 * @dummy: unused dummy argument
669 *
670 * Nop function called via smp_call_function to force work items from
671 * pending external iucv interrupts to the work queue.
672 */
__iucv_cleanup_queue(void * dummy)673 static void __iucv_cleanup_queue(void *dummy)
674 {
675 }
676
677 /**
678 * iucv_cleanup_queue
679 *
680 * Function called after a path has been severed to find all remaining
681 * work items for the now stale pathid. The caller needs to hold the
682 * iucv_table_lock.
683 */
iucv_cleanup_queue(void)684 static void iucv_cleanup_queue(void)
685 {
686 struct iucv_irq_list *p, *n;
687
688 /*
689 * When a path is severed, the pathid can be reused immediately
690 * on a iucv connect or a connection pending interrupt. Remove
691 * all entries from the task queue that refer to a stale pathid
692 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
693 * or deliver the connection pending interrupt. To get all the
694 * pending interrupts force them to the work queue by calling
695 * an empty function on all cpus.
696 */
697 smp_call_function(__iucv_cleanup_queue, NULL, 1);
698 spin_lock_irq(&iucv_queue_lock);
699 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
700 /* Remove stale work items from the task queue. */
701 if (iucv_path_table[p->data.ippathid] == NULL) {
702 list_del(&p->list);
703 kfree(p);
704 }
705 }
706 spin_unlock_irq(&iucv_queue_lock);
707 }
708
709 /**
710 * iucv_register:
711 * @handler: address of iucv handler structure
712 * @smp: != 0 indicates that the handler can deal with out of order messages
713 *
714 * Registers a driver with IUCV.
715 *
716 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
717 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
718 */
iucv_register(struct iucv_handler * handler,int smp)719 int iucv_register(struct iucv_handler *handler, int smp)
720 {
721 int rc;
722
723 if (!iucv_available)
724 return -ENOSYS;
725 mutex_lock(&iucv_register_mutex);
726 if (!smp)
727 iucv_nonsmp_handler++;
728 if (list_empty(&iucv_handler_list)) {
729 rc = iucv_enable();
730 if (rc)
731 goto out_mutex;
732 } else if (!smp && iucv_nonsmp_handler == 1)
733 iucv_setmask_up();
734 INIT_LIST_HEAD(&handler->paths);
735
736 spin_lock_bh(&iucv_table_lock);
737 list_add_tail(&handler->list, &iucv_handler_list);
738 spin_unlock_bh(&iucv_table_lock);
739 rc = 0;
740 out_mutex:
741 mutex_unlock(&iucv_register_mutex);
742 return rc;
743 }
744 EXPORT_SYMBOL(iucv_register);
745
746 /**
747 * iucv_unregister
748 * @handler: address of iucv handler structure
749 * @smp: != 0 indicates that the handler can deal with out of order messages
750 *
751 * Unregister driver from IUCV.
752 */
iucv_unregister(struct iucv_handler * handler,int smp)753 void iucv_unregister(struct iucv_handler *handler, int smp)
754 {
755 struct iucv_path *p, *n;
756
757 mutex_lock(&iucv_register_mutex);
758 spin_lock_bh(&iucv_table_lock);
759 /* Remove handler from the iucv_handler_list. */
760 list_del_init(&handler->list);
761 /* Sever all pathids still referring to the handler. */
762 list_for_each_entry_safe(p, n, &handler->paths, list) {
763 iucv_sever_pathid(p->pathid, NULL);
764 iucv_path_table[p->pathid] = NULL;
765 list_del(&p->list);
766 iucv_path_free(p);
767 }
768 spin_unlock_bh(&iucv_table_lock);
769 if (!smp)
770 iucv_nonsmp_handler--;
771 if (list_empty(&iucv_handler_list))
772 iucv_disable();
773 else if (!smp && iucv_nonsmp_handler == 0)
774 iucv_setmask_mp();
775 mutex_unlock(&iucv_register_mutex);
776 }
777 EXPORT_SYMBOL(iucv_unregister);
778
iucv_reboot_event(struct notifier_block * this,unsigned long event,void * ptr)779 static int iucv_reboot_event(struct notifier_block *this,
780 unsigned long event, void *ptr)
781 {
782 int i;
783
784 if (cpumask_empty(&iucv_irq_cpumask))
785 return NOTIFY_DONE;
786
787 get_online_cpus();
788 on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
789 preempt_disable();
790 for (i = 0; i < iucv_max_pathid; i++) {
791 if (iucv_path_table[i])
792 iucv_sever_pathid(i, NULL);
793 }
794 preempt_enable();
795 put_online_cpus();
796 iucv_disable();
797 return NOTIFY_DONE;
798 }
799
800 static struct notifier_block iucv_reboot_notifier = {
801 .notifier_call = iucv_reboot_event,
802 };
803
804 /**
805 * iucv_path_accept
806 * @path: address of iucv path structure
807 * @handler: address of iucv handler structure
808 * @userdata: 16 bytes of data reflected to the communication partner
809 * @private: private data passed to interrupt handlers for this path
810 *
811 * This function is issued after the user received a connection pending
812 * external interrupt and now wishes to complete the IUCV communication path.
813 *
814 * Returns the result of the CP IUCV call.
815 */
iucv_path_accept(struct iucv_path * path,struct iucv_handler * handler,u8 * userdata,void * private)816 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
817 u8 *userdata, void *private)
818 {
819 union iucv_param *parm;
820 int rc;
821
822 local_bh_disable();
823 if (cpumask_empty(&iucv_buffer_cpumask)) {
824 rc = -EIO;
825 goto out;
826 }
827 /* Prepare parameter block. */
828 parm = iucv_param[smp_processor_id()];
829 memset(parm, 0, sizeof(union iucv_param));
830 parm->ctrl.ippathid = path->pathid;
831 parm->ctrl.ipmsglim = path->msglim;
832 if (userdata)
833 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
834 parm->ctrl.ipflags1 = path->flags;
835
836 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
837 if (!rc) {
838 path->private = private;
839 path->msglim = parm->ctrl.ipmsglim;
840 path->flags = parm->ctrl.ipflags1;
841 }
842 out:
843 local_bh_enable();
844 return rc;
845 }
846 EXPORT_SYMBOL(iucv_path_accept);
847
848 /**
849 * iucv_path_connect
850 * @path: address of iucv path structure
851 * @handler: address of iucv handler structure
852 * @userid: 8-byte user identification
853 * @system: 8-byte target system identification
854 * @userdata: 16 bytes of data reflected to the communication partner
855 * @private: private data passed to interrupt handlers for this path
856 *
857 * This function establishes an IUCV path. Although the connect may complete
858 * successfully, you are not able to use the path until you receive an IUCV
859 * Connection Complete external interrupt.
860 *
861 * Returns the result of the CP IUCV call.
862 */
iucv_path_connect(struct iucv_path * path,struct iucv_handler * handler,u8 * userid,u8 * system,u8 * userdata,void * private)863 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
864 u8 *userid, u8 *system, u8 *userdata,
865 void *private)
866 {
867 union iucv_param *parm;
868 int rc;
869
870 spin_lock_bh(&iucv_table_lock);
871 iucv_cleanup_queue();
872 if (cpumask_empty(&iucv_buffer_cpumask)) {
873 rc = -EIO;
874 goto out;
875 }
876 parm = iucv_param[smp_processor_id()];
877 memset(parm, 0, sizeof(union iucv_param));
878 parm->ctrl.ipmsglim = path->msglim;
879 parm->ctrl.ipflags1 = path->flags;
880 if (userid) {
881 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
882 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
883 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
884 }
885 if (system) {
886 memcpy(parm->ctrl.iptarget, system,
887 sizeof(parm->ctrl.iptarget));
888 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
889 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
890 }
891 if (userdata)
892 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
893
894 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
895 if (!rc) {
896 if (parm->ctrl.ippathid < iucv_max_pathid) {
897 path->pathid = parm->ctrl.ippathid;
898 path->msglim = parm->ctrl.ipmsglim;
899 path->flags = parm->ctrl.ipflags1;
900 path->handler = handler;
901 path->private = private;
902 list_add_tail(&path->list, &handler->paths);
903 iucv_path_table[path->pathid] = path;
904 } else {
905 iucv_sever_pathid(parm->ctrl.ippathid,
906 iucv_error_pathid);
907 rc = -EIO;
908 }
909 }
910 out:
911 spin_unlock_bh(&iucv_table_lock);
912 return rc;
913 }
914 EXPORT_SYMBOL(iucv_path_connect);
915
916 /**
917 * iucv_path_quiesce:
918 * @path: address of iucv path structure
919 * @userdata: 16 bytes of data reflected to the communication partner
920 *
921 * This function temporarily suspends incoming messages on an IUCV path.
922 * You can later reactivate the path by invoking the iucv_resume function.
923 *
924 * Returns the result from the CP IUCV call.
925 */
iucv_path_quiesce(struct iucv_path * path,u8 * userdata)926 int iucv_path_quiesce(struct iucv_path *path, u8 *userdata)
927 {
928 union iucv_param *parm;
929 int rc;
930
931 local_bh_disable();
932 if (cpumask_empty(&iucv_buffer_cpumask)) {
933 rc = -EIO;
934 goto out;
935 }
936 parm = iucv_param[smp_processor_id()];
937 memset(parm, 0, sizeof(union iucv_param));
938 if (userdata)
939 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
940 parm->ctrl.ippathid = path->pathid;
941 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
942 out:
943 local_bh_enable();
944 return rc;
945 }
946 EXPORT_SYMBOL(iucv_path_quiesce);
947
948 /**
949 * iucv_path_resume:
950 * @path: address of iucv path structure
951 * @userdata: 16 bytes of data reflected to the communication partner
952 *
953 * This function resumes incoming messages on an IUCV path that has
954 * been stopped with iucv_path_quiesce.
955 *
956 * Returns the result from the CP IUCV call.
957 */
iucv_path_resume(struct iucv_path * path,u8 * userdata)958 int iucv_path_resume(struct iucv_path *path, u8 *userdata)
959 {
960 union iucv_param *parm;
961 int rc;
962
963 local_bh_disable();
964 if (cpumask_empty(&iucv_buffer_cpumask)) {
965 rc = -EIO;
966 goto out;
967 }
968 parm = iucv_param[smp_processor_id()];
969 memset(parm, 0, sizeof(union iucv_param));
970 if (userdata)
971 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
972 parm->ctrl.ippathid = path->pathid;
973 rc = iucv_call_b2f0(IUCV_RESUME, parm);
974 out:
975 local_bh_enable();
976 return rc;
977 }
978
979 /**
980 * iucv_path_sever
981 * @path: address of iucv path structure
982 * @userdata: 16 bytes of data reflected to the communication partner
983 *
984 * This function terminates an IUCV path.
985 *
986 * Returns the result from the CP IUCV call.
987 */
iucv_path_sever(struct iucv_path * path,u8 * userdata)988 int iucv_path_sever(struct iucv_path *path, u8 *userdata)
989 {
990 int rc;
991
992 preempt_disable();
993 if (cpumask_empty(&iucv_buffer_cpumask)) {
994 rc = -EIO;
995 goto out;
996 }
997 if (iucv_active_cpu != smp_processor_id())
998 spin_lock_bh(&iucv_table_lock);
999 rc = iucv_sever_pathid(path->pathid, userdata);
1000 iucv_path_table[path->pathid] = NULL;
1001 list_del_init(&path->list);
1002 if (iucv_active_cpu != smp_processor_id())
1003 spin_unlock_bh(&iucv_table_lock);
1004 out:
1005 preempt_enable();
1006 return rc;
1007 }
1008 EXPORT_SYMBOL(iucv_path_sever);
1009
1010 /**
1011 * iucv_message_purge
1012 * @path: address of iucv path structure
1013 * @msg: address of iucv msg structure
1014 * @srccls: source class of message
1015 *
1016 * Cancels a message you have sent.
1017 *
1018 * Returns the result from the CP IUCV call.
1019 */
iucv_message_purge(struct iucv_path * path,struct iucv_message * msg,u32 srccls)1020 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1021 u32 srccls)
1022 {
1023 union iucv_param *parm;
1024 int rc;
1025
1026 local_bh_disable();
1027 if (cpumask_empty(&iucv_buffer_cpumask)) {
1028 rc = -EIO;
1029 goto out;
1030 }
1031 parm = iucv_param[smp_processor_id()];
1032 memset(parm, 0, sizeof(union iucv_param));
1033 parm->purge.ippathid = path->pathid;
1034 parm->purge.ipmsgid = msg->id;
1035 parm->purge.ipsrccls = srccls;
1036 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1037 rc = iucv_call_b2f0(IUCV_PURGE, parm);
1038 if (!rc) {
1039 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1040 msg->tag = parm->purge.ipmsgtag;
1041 }
1042 out:
1043 local_bh_enable();
1044 return rc;
1045 }
1046 EXPORT_SYMBOL(iucv_message_purge);
1047
1048 /**
1049 * iucv_message_receive_iprmdata
1050 * @path: address of iucv path structure
1051 * @msg: address of iucv msg structure
1052 * @flags: how the message is received (IUCV_IPBUFLST)
1053 * @buffer: address of data buffer or address of struct iucv_array
1054 * @size: length of data buffer
1055 * @residual:
1056 *
1057 * Internal function used by iucv_message_receive and __iucv_message_receive
1058 * to receive RMDATA data stored in struct iucv_message.
1059 */
iucv_message_receive_iprmdata(struct iucv_path * path,struct iucv_message * msg,u8 flags,void * buffer,size_t size,size_t * residual)1060 static int iucv_message_receive_iprmdata(struct iucv_path *path,
1061 struct iucv_message *msg,
1062 u8 flags, void *buffer,
1063 size_t size, size_t *residual)
1064 {
1065 struct iucv_array *array;
1066 u8 *rmmsg;
1067 size_t copy;
1068
1069 /*
1070 * Message is 8 bytes long and has been stored to the
1071 * message descriptor itself.
1072 */
1073 if (residual)
1074 *residual = abs(size - 8);
1075 rmmsg = msg->rmmsg;
1076 if (flags & IUCV_IPBUFLST) {
1077 /* Copy to struct iucv_array. */
1078 size = (size < 8) ? size : 8;
1079 for (array = buffer; size > 0; array++) {
1080 copy = min_t(size_t, size, array->length);
1081 memcpy((u8 *)(addr_t) array->address,
1082 rmmsg, copy);
1083 rmmsg += copy;
1084 size -= copy;
1085 }
1086 } else {
1087 /* Copy to direct buffer. */
1088 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1089 }
1090 return 0;
1091 }
1092
1093 /**
1094 * __iucv_message_receive
1095 * @path: address of iucv path structure
1096 * @msg: address of iucv msg structure
1097 * @flags: how the message is received (IUCV_IPBUFLST)
1098 * @buffer: address of data buffer or address of struct iucv_array
1099 * @size: length of data buffer
1100 * @residual:
1101 *
1102 * This function receives messages that are being sent to you over
1103 * established paths. This function will deal with RMDATA messages
1104 * embedded in struct iucv_message as well.
1105 *
1106 * Locking: no locking
1107 *
1108 * Returns the result from the CP IUCV call.
1109 */
__iucv_message_receive(struct iucv_path * path,struct iucv_message * msg,u8 flags,void * buffer,size_t size,size_t * residual)1110 int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1111 u8 flags, void *buffer, size_t size, size_t *residual)
1112 {
1113 union iucv_param *parm;
1114 int rc;
1115
1116 if (msg->flags & IUCV_IPRMDATA)
1117 return iucv_message_receive_iprmdata(path, msg, flags,
1118 buffer, size, residual);
1119 if (cpumask_empty(&iucv_buffer_cpumask))
1120 return -EIO;
1121
1122 parm = iucv_param[smp_processor_id()];
1123 memset(parm, 0, sizeof(union iucv_param));
1124 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1125 parm->db.ipbfln1f = (u32) size;
1126 parm->db.ipmsgid = msg->id;
1127 parm->db.ippathid = path->pathid;
1128 parm->db.iptrgcls = msg->class;
1129 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1130 IUCV_IPFGMID | IUCV_IPTRGCLS);
1131 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1132 if (!rc || rc == 5) {
1133 msg->flags = parm->db.ipflags1;
1134 if (residual)
1135 *residual = parm->db.ipbfln1f;
1136 }
1137 return rc;
1138 }
1139 EXPORT_SYMBOL(__iucv_message_receive);
1140
1141 /**
1142 * iucv_message_receive
1143 * @path: address of iucv path structure
1144 * @msg: address of iucv msg structure
1145 * @flags: how the message is received (IUCV_IPBUFLST)
1146 * @buffer: address of data buffer or address of struct iucv_array
1147 * @size: length of data buffer
1148 * @residual:
1149 *
1150 * This function receives messages that are being sent to you over
1151 * established paths. This function will deal with RMDATA messages
1152 * embedded in struct iucv_message as well.
1153 *
1154 * Locking: local_bh_enable/local_bh_disable
1155 *
1156 * Returns the result from the CP IUCV call.
1157 */
iucv_message_receive(struct iucv_path * path,struct iucv_message * msg,u8 flags,void * buffer,size_t size,size_t * residual)1158 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1159 u8 flags, void *buffer, size_t size, size_t *residual)
1160 {
1161 int rc;
1162
1163 if (msg->flags & IUCV_IPRMDATA)
1164 return iucv_message_receive_iprmdata(path, msg, flags,
1165 buffer, size, residual);
1166 local_bh_disable();
1167 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1168 local_bh_enable();
1169 return rc;
1170 }
1171 EXPORT_SYMBOL(iucv_message_receive);
1172
1173 /**
1174 * iucv_message_reject
1175 * @path: address of iucv path structure
1176 * @msg: address of iucv msg structure
1177 *
1178 * The reject function refuses a specified message. Between the time you
1179 * are notified of a message and the time that you complete the message,
1180 * the message may be rejected.
1181 *
1182 * Returns the result from the CP IUCV call.
1183 */
iucv_message_reject(struct iucv_path * path,struct iucv_message * msg)1184 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1185 {
1186 union iucv_param *parm;
1187 int rc;
1188
1189 local_bh_disable();
1190 if (cpumask_empty(&iucv_buffer_cpumask)) {
1191 rc = -EIO;
1192 goto out;
1193 }
1194 parm = iucv_param[smp_processor_id()];
1195 memset(parm, 0, sizeof(union iucv_param));
1196 parm->db.ippathid = path->pathid;
1197 parm->db.ipmsgid = msg->id;
1198 parm->db.iptrgcls = msg->class;
1199 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1200 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1201 out:
1202 local_bh_enable();
1203 return rc;
1204 }
1205 EXPORT_SYMBOL(iucv_message_reject);
1206
1207 /**
1208 * iucv_message_reply
1209 * @path: address of iucv path structure
1210 * @msg: address of iucv msg structure
1211 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1212 * @reply: address of reply data buffer or address of struct iucv_array
1213 * @size: length of reply data buffer
1214 *
1215 * This function responds to the two-way messages that you receive. You
1216 * must identify completely the message to which you wish to reply. ie,
1217 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1218 * the parameter list.
1219 *
1220 * Returns the result from the CP IUCV call.
1221 */
iucv_message_reply(struct iucv_path * path,struct iucv_message * msg,u8 flags,void * reply,size_t size)1222 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1223 u8 flags, void *reply, size_t size)
1224 {
1225 union iucv_param *parm;
1226 int rc;
1227
1228 local_bh_disable();
1229 if (cpumask_empty(&iucv_buffer_cpumask)) {
1230 rc = -EIO;
1231 goto out;
1232 }
1233 parm = iucv_param[smp_processor_id()];
1234 memset(parm, 0, sizeof(union iucv_param));
1235 if (flags & IUCV_IPRMDATA) {
1236 parm->dpl.ippathid = path->pathid;
1237 parm->dpl.ipflags1 = flags;
1238 parm->dpl.ipmsgid = msg->id;
1239 parm->dpl.iptrgcls = msg->class;
1240 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1241 } else {
1242 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1243 parm->db.ipbfln1f = (u32) size;
1244 parm->db.ippathid = path->pathid;
1245 parm->db.ipflags1 = flags;
1246 parm->db.ipmsgid = msg->id;
1247 parm->db.iptrgcls = msg->class;
1248 }
1249 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1250 out:
1251 local_bh_enable();
1252 return rc;
1253 }
1254 EXPORT_SYMBOL(iucv_message_reply);
1255
1256 /**
1257 * __iucv_message_send
1258 * @path: address of iucv path structure
1259 * @msg: address of iucv msg structure
1260 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1261 * @srccls: source class of message
1262 * @buffer: address of send buffer or address of struct iucv_array
1263 * @size: length of send buffer
1264 *
1265 * This function transmits data to another application. Data to be
1266 * transmitted is in a buffer and this is a one-way message and the
1267 * receiver will not reply to the message.
1268 *
1269 * Locking: no locking
1270 *
1271 * Returns the result from the CP IUCV call.
1272 */
__iucv_message_send(struct iucv_path * path,struct iucv_message * msg,u8 flags,u32 srccls,void * buffer,size_t size)1273 int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1274 u8 flags, u32 srccls, void *buffer, size_t size)
1275 {
1276 union iucv_param *parm;
1277 int rc;
1278
1279 if (cpumask_empty(&iucv_buffer_cpumask)) {
1280 rc = -EIO;
1281 goto out;
1282 }
1283 parm = iucv_param[smp_processor_id()];
1284 memset(parm, 0, sizeof(union iucv_param));
1285 if (flags & IUCV_IPRMDATA) {
1286 /* Message of 8 bytes can be placed into the parameter list. */
1287 parm->dpl.ippathid = path->pathid;
1288 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1289 parm->dpl.iptrgcls = msg->class;
1290 parm->dpl.ipsrccls = srccls;
1291 parm->dpl.ipmsgtag = msg->tag;
1292 memcpy(parm->dpl.iprmmsg, buffer, 8);
1293 } else {
1294 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1295 parm->db.ipbfln1f = (u32) size;
1296 parm->db.ippathid = path->pathid;
1297 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1298 parm->db.iptrgcls = msg->class;
1299 parm->db.ipsrccls = srccls;
1300 parm->db.ipmsgtag = msg->tag;
1301 }
1302 rc = iucv_call_b2f0(IUCV_SEND, parm);
1303 if (!rc)
1304 msg->id = parm->db.ipmsgid;
1305 out:
1306 return rc;
1307 }
1308 EXPORT_SYMBOL(__iucv_message_send);
1309
1310 /**
1311 * iucv_message_send
1312 * @path: address of iucv path structure
1313 * @msg: address of iucv msg structure
1314 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1315 * @srccls: source class of message
1316 * @buffer: address of send buffer or address of struct iucv_array
1317 * @size: length of send buffer
1318 *
1319 * This function transmits data to another application. Data to be
1320 * transmitted is in a buffer and this is a one-way message and the
1321 * receiver will not reply to the message.
1322 *
1323 * Locking: local_bh_enable/local_bh_disable
1324 *
1325 * Returns the result from the CP IUCV call.
1326 */
iucv_message_send(struct iucv_path * path,struct iucv_message * msg,u8 flags,u32 srccls,void * buffer,size_t size)1327 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1328 u8 flags, u32 srccls, void *buffer, size_t size)
1329 {
1330 int rc;
1331
1332 local_bh_disable();
1333 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1334 local_bh_enable();
1335 return rc;
1336 }
1337 EXPORT_SYMBOL(iucv_message_send);
1338
1339 /**
1340 * iucv_message_send2way
1341 * @path: address of iucv path structure
1342 * @msg: address of iucv msg structure
1343 * @flags: how the message is sent and the reply is received
1344 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1345 * @srccls: source class of message
1346 * @buffer: address of send buffer or address of struct iucv_array
1347 * @size: length of send buffer
1348 * @ansbuf: address of answer buffer or address of struct iucv_array
1349 * @asize: size of reply buffer
1350 *
1351 * This function transmits data to another application. Data to be
1352 * transmitted is in a buffer. The receiver of the send is expected to
1353 * reply to the message and a buffer is provided into which IUCV moves
1354 * the reply to this message.
1355 *
1356 * Returns the result from the CP IUCV call.
1357 */
iucv_message_send2way(struct iucv_path * path,struct iucv_message * msg,u8 flags,u32 srccls,void * buffer,size_t size,void * answer,size_t asize,size_t * residual)1358 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1359 u8 flags, u32 srccls, void *buffer, size_t size,
1360 void *answer, size_t asize, size_t *residual)
1361 {
1362 union iucv_param *parm;
1363 int rc;
1364
1365 local_bh_disable();
1366 if (cpumask_empty(&iucv_buffer_cpumask)) {
1367 rc = -EIO;
1368 goto out;
1369 }
1370 parm = iucv_param[smp_processor_id()];
1371 memset(parm, 0, sizeof(union iucv_param));
1372 if (flags & IUCV_IPRMDATA) {
1373 parm->dpl.ippathid = path->pathid;
1374 parm->dpl.ipflags1 = path->flags; /* priority message */
1375 parm->dpl.iptrgcls = msg->class;
1376 parm->dpl.ipsrccls = srccls;
1377 parm->dpl.ipmsgtag = msg->tag;
1378 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1379 parm->dpl.ipbfln2f = (u32) asize;
1380 memcpy(parm->dpl.iprmmsg, buffer, 8);
1381 } else {
1382 parm->db.ippathid = path->pathid;
1383 parm->db.ipflags1 = path->flags; /* priority message */
1384 parm->db.iptrgcls = msg->class;
1385 parm->db.ipsrccls = srccls;
1386 parm->db.ipmsgtag = msg->tag;
1387 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1388 parm->db.ipbfln1f = (u32) size;
1389 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1390 parm->db.ipbfln2f = (u32) asize;
1391 }
1392 rc = iucv_call_b2f0(IUCV_SEND, parm);
1393 if (!rc)
1394 msg->id = parm->db.ipmsgid;
1395 out:
1396 local_bh_enable();
1397 return rc;
1398 }
1399 EXPORT_SYMBOL(iucv_message_send2way);
1400
1401 /**
1402 * iucv_path_pending
1403 * @data: Pointer to external interrupt buffer
1404 *
1405 * Process connection pending work item. Called from tasklet while holding
1406 * iucv_table_lock.
1407 */
1408 struct iucv_path_pending {
1409 u16 ippathid;
1410 u8 ipflags1;
1411 u8 iptype;
1412 u16 ipmsglim;
1413 u16 res1;
1414 u8 ipvmid[8];
1415 u8 ipuser[16];
1416 u32 res3;
1417 u8 ippollfg;
1418 u8 res4[3];
1419 } __packed;
1420
iucv_path_pending(struct iucv_irq_data * data)1421 static void iucv_path_pending(struct iucv_irq_data *data)
1422 {
1423 struct iucv_path_pending *ipp = (void *) data;
1424 struct iucv_handler *handler;
1425 struct iucv_path *path;
1426 char *error;
1427
1428 BUG_ON(iucv_path_table[ipp->ippathid]);
1429 /* New pathid, handler found. Create a new path struct. */
1430 error = iucv_error_no_memory;
1431 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1432 if (!path)
1433 goto out_sever;
1434 path->pathid = ipp->ippathid;
1435 iucv_path_table[path->pathid] = path;
1436 EBCASC(ipp->ipvmid, 8);
1437
1438 /* Call registered handler until one is found that wants the path. */
1439 list_for_each_entry(handler, &iucv_handler_list, list) {
1440 if (!handler->path_pending)
1441 continue;
1442 /*
1443 * Add path to handler to allow a call to iucv_path_sever
1444 * inside the path_pending function. If the handler returns
1445 * an error remove the path from the handler again.
1446 */
1447 list_add(&path->list, &handler->paths);
1448 path->handler = handler;
1449 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1450 return;
1451 list_del(&path->list);
1452 path->handler = NULL;
1453 }
1454 /* No handler wanted the path. */
1455 iucv_path_table[path->pathid] = NULL;
1456 iucv_path_free(path);
1457 error = iucv_error_no_listener;
1458 out_sever:
1459 iucv_sever_pathid(ipp->ippathid, error);
1460 }
1461
1462 /**
1463 * iucv_path_complete
1464 * @data: Pointer to external interrupt buffer
1465 *
1466 * Process connection complete work item. Called from tasklet while holding
1467 * iucv_table_lock.
1468 */
1469 struct iucv_path_complete {
1470 u16 ippathid;
1471 u8 ipflags1;
1472 u8 iptype;
1473 u16 ipmsglim;
1474 u16 res1;
1475 u8 res2[8];
1476 u8 ipuser[16];
1477 u32 res3;
1478 u8 ippollfg;
1479 u8 res4[3];
1480 } __packed;
1481
iucv_path_complete(struct iucv_irq_data * data)1482 static void iucv_path_complete(struct iucv_irq_data *data)
1483 {
1484 struct iucv_path_complete *ipc = (void *) data;
1485 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1486
1487 if (path)
1488 path->flags = ipc->ipflags1;
1489 if (path && path->handler && path->handler->path_complete)
1490 path->handler->path_complete(path, ipc->ipuser);
1491 }
1492
1493 /**
1494 * iucv_path_severed
1495 * @data: Pointer to external interrupt buffer
1496 *
1497 * Process connection severed work item. Called from tasklet while holding
1498 * iucv_table_lock.
1499 */
1500 struct iucv_path_severed {
1501 u16 ippathid;
1502 u8 res1;
1503 u8 iptype;
1504 u32 res2;
1505 u8 res3[8];
1506 u8 ipuser[16];
1507 u32 res4;
1508 u8 ippollfg;
1509 u8 res5[3];
1510 } __packed;
1511
iucv_path_severed(struct iucv_irq_data * data)1512 static void iucv_path_severed(struct iucv_irq_data *data)
1513 {
1514 struct iucv_path_severed *ips = (void *) data;
1515 struct iucv_path *path = iucv_path_table[ips->ippathid];
1516
1517 if (!path || !path->handler) /* Already severed */
1518 return;
1519 if (path->handler->path_severed)
1520 path->handler->path_severed(path, ips->ipuser);
1521 else {
1522 iucv_sever_pathid(path->pathid, NULL);
1523 iucv_path_table[path->pathid] = NULL;
1524 list_del(&path->list);
1525 iucv_path_free(path);
1526 }
1527 }
1528
1529 /**
1530 * iucv_path_quiesced
1531 * @data: Pointer to external interrupt buffer
1532 *
1533 * Process connection quiesced work item. Called from tasklet while holding
1534 * iucv_table_lock.
1535 */
1536 struct iucv_path_quiesced {
1537 u16 ippathid;
1538 u8 res1;
1539 u8 iptype;
1540 u32 res2;
1541 u8 res3[8];
1542 u8 ipuser[16];
1543 u32 res4;
1544 u8 ippollfg;
1545 u8 res5[3];
1546 } __packed;
1547
iucv_path_quiesced(struct iucv_irq_data * data)1548 static void iucv_path_quiesced(struct iucv_irq_data *data)
1549 {
1550 struct iucv_path_quiesced *ipq = (void *) data;
1551 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1552
1553 if (path && path->handler && path->handler->path_quiesced)
1554 path->handler->path_quiesced(path, ipq->ipuser);
1555 }
1556
1557 /**
1558 * iucv_path_resumed
1559 * @data: Pointer to external interrupt buffer
1560 *
1561 * Process connection resumed work item. Called from tasklet while holding
1562 * iucv_table_lock.
1563 */
1564 struct iucv_path_resumed {
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;
1575
iucv_path_resumed(struct iucv_irq_data * data)1576 static void iucv_path_resumed(struct iucv_irq_data *data)
1577 {
1578 struct iucv_path_resumed *ipr = (void *) data;
1579 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1580
1581 if (path && path->handler && path->handler->path_resumed)
1582 path->handler->path_resumed(path, ipr->ipuser);
1583 }
1584
1585 /**
1586 * iucv_message_complete
1587 * @data: Pointer to external interrupt buffer
1588 *
1589 * Process message complete work item. Called from tasklet while holding
1590 * iucv_table_lock.
1591 */
1592 struct iucv_message_complete {
1593 u16 ippathid;
1594 u8 ipflags1;
1595 u8 iptype;
1596 u32 ipmsgid;
1597 u32 ipaudit;
1598 u8 iprmmsg[8];
1599 u32 ipsrccls;
1600 u32 ipmsgtag;
1601 u32 res;
1602 u32 ipbfln2f;
1603 u8 ippollfg;
1604 u8 res2[3];
1605 } __packed;
1606
iucv_message_complete(struct iucv_irq_data * data)1607 static void iucv_message_complete(struct iucv_irq_data *data)
1608 {
1609 struct iucv_message_complete *imc = (void *) data;
1610 struct iucv_path *path = iucv_path_table[imc->ippathid];
1611 struct iucv_message msg;
1612
1613 if (path && path->handler && path->handler->message_complete) {
1614 msg.flags = imc->ipflags1;
1615 msg.id = imc->ipmsgid;
1616 msg.audit = imc->ipaudit;
1617 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1618 msg.class = imc->ipsrccls;
1619 msg.tag = imc->ipmsgtag;
1620 msg.length = imc->ipbfln2f;
1621 path->handler->message_complete(path, &msg);
1622 }
1623 }
1624
1625 /**
1626 * iucv_message_pending
1627 * @data: Pointer to external interrupt buffer
1628 *
1629 * Process message pending work item. Called from tasklet while holding
1630 * iucv_table_lock.
1631 */
1632 struct iucv_message_pending {
1633 u16 ippathid;
1634 u8 ipflags1;
1635 u8 iptype;
1636 u32 ipmsgid;
1637 u32 iptrgcls;
1638 union {
1639 u32 iprmmsg1_u32;
1640 u8 iprmmsg1[4];
1641 } ln1msg1;
1642 union {
1643 u32 ipbfln1f;
1644 u8 iprmmsg2[4];
1645 } ln1msg2;
1646 u32 res1[3];
1647 u32 ipbfln2f;
1648 u8 ippollfg;
1649 u8 res2[3];
1650 } __packed;
1651
iucv_message_pending(struct iucv_irq_data * data)1652 static void iucv_message_pending(struct iucv_irq_data *data)
1653 {
1654 struct iucv_message_pending *imp = (void *) data;
1655 struct iucv_path *path = iucv_path_table[imp->ippathid];
1656 struct iucv_message msg;
1657
1658 if (path && path->handler && path->handler->message_pending) {
1659 msg.flags = imp->ipflags1;
1660 msg.id = imp->ipmsgid;
1661 msg.class = imp->iptrgcls;
1662 if (imp->ipflags1 & IUCV_IPRMDATA) {
1663 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1664 msg.length = 8;
1665 } else
1666 msg.length = imp->ln1msg2.ipbfln1f;
1667 msg.reply_size = imp->ipbfln2f;
1668 path->handler->message_pending(path, &msg);
1669 }
1670 }
1671
1672 /**
1673 * iucv_tasklet_fn:
1674 *
1675 * This tasklet loops over the queue of irq buffers created by
1676 * iucv_external_interrupt, calls the appropriate action handler
1677 * and then frees the buffer.
1678 */
iucv_tasklet_fn(unsigned long ignored)1679 static void iucv_tasklet_fn(unsigned long ignored)
1680 {
1681 typedef void iucv_irq_fn(struct iucv_irq_data *);
1682 static iucv_irq_fn *irq_fn[] = {
1683 [0x02] = iucv_path_complete,
1684 [0x03] = iucv_path_severed,
1685 [0x04] = iucv_path_quiesced,
1686 [0x05] = iucv_path_resumed,
1687 [0x06] = iucv_message_complete,
1688 [0x07] = iucv_message_complete,
1689 [0x08] = iucv_message_pending,
1690 [0x09] = iucv_message_pending,
1691 };
1692 LIST_HEAD(task_queue);
1693 struct iucv_irq_list *p, *n;
1694
1695 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1696 if (!spin_trylock(&iucv_table_lock)) {
1697 tasklet_schedule(&iucv_tasklet);
1698 return;
1699 }
1700 iucv_active_cpu = smp_processor_id();
1701
1702 spin_lock_irq(&iucv_queue_lock);
1703 list_splice_init(&iucv_task_queue, &task_queue);
1704 spin_unlock_irq(&iucv_queue_lock);
1705
1706 list_for_each_entry_safe(p, n, &task_queue, list) {
1707 list_del_init(&p->list);
1708 irq_fn[p->data.iptype](&p->data);
1709 kfree(p);
1710 }
1711
1712 iucv_active_cpu = -1;
1713 spin_unlock(&iucv_table_lock);
1714 }
1715
1716 /**
1717 * iucv_work_fn:
1718 *
1719 * This work function loops over the queue of path pending irq blocks
1720 * created by iucv_external_interrupt, calls the appropriate action
1721 * handler and then frees the buffer.
1722 */
iucv_work_fn(struct work_struct * work)1723 static void iucv_work_fn(struct work_struct *work)
1724 {
1725 LIST_HEAD(work_queue);
1726 struct iucv_irq_list *p, *n;
1727
1728 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1729 spin_lock_bh(&iucv_table_lock);
1730 iucv_active_cpu = smp_processor_id();
1731
1732 spin_lock_irq(&iucv_queue_lock);
1733 list_splice_init(&iucv_work_queue, &work_queue);
1734 spin_unlock_irq(&iucv_queue_lock);
1735
1736 iucv_cleanup_queue();
1737 list_for_each_entry_safe(p, n, &work_queue, list) {
1738 list_del_init(&p->list);
1739 iucv_path_pending(&p->data);
1740 kfree(p);
1741 }
1742
1743 iucv_active_cpu = -1;
1744 spin_unlock_bh(&iucv_table_lock);
1745 }
1746
1747 /**
1748 * iucv_external_interrupt
1749 * @code: irq code
1750 *
1751 * Handles external interrupts coming in from CP.
1752 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1753 */
iucv_external_interrupt(struct ext_code ext_code,unsigned int param32,unsigned long param64)1754 static void iucv_external_interrupt(struct ext_code ext_code,
1755 unsigned int param32, unsigned long param64)
1756 {
1757 struct iucv_irq_data *p;
1758 struct iucv_irq_list *work;
1759
1760 inc_irq_stat(IRQEXT_IUC);
1761 p = iucv_irq_data[smp_processor_id()];
1762 if (p->ippathid >= iucv_max_pathid) {
1763 WARN_ON(p->ippathid >= iucv_max_pathid);
1764 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1765 return;
1766 }
1767 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
1768 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1769 if (!work) {
1770 pr_warn("iucv_external_interrupt: out of memory\n");
1771 return;
1772 }
1773 memcpy(&work->data, p, sizeof(work->data));
1774 spin_lock(&iucv_queue_lock);
1775 if (p->iptype == 0x01) {
1776 /* Path pending interrupt. */
1777 list_add_tail(&work->list, &iucv_work_queue);
1778 schedule_work(&iucv_work);
1779 } else {
1780 /* The other interrupts. */
1781 list_add_tail(&work->list, &iucv_task_queue);
1782 tasklet_schedule(&iucv_tasklet);
1783 }
1784 spin_unlock(&iucv_queue_lock);
1785 }
1786
1787 struct iucv_interface iucv_if = {
1788 .message_receive = iucv_message_receive,
1789 .__message_receive = __iucv_message_receive,
1790 .message_reply = iucv_message_reply,
1791 .message_reject = iucv_message_reject,
1792 .message_send = iucv_message_send,
1793 .__message_send = __iucv_message_send,
1794 .message_send2way = iucv_message_send2way,
1795 .message_purge = iucv_message_purge,
1796 .path_accept = iucv_path_accept,
1797 .path_connect = iucv_path_connect,
1798 .path_quiesce = iucv_path_quiesce,
1799 .path_resume = iucv_path_resume,
1800 .path_sever = iucv_path_sever,
1801 .iucv_register = iucv_register,
1802 .iucv_unregister = iucv_unregister,
1803 .bus = NULL,
1804 .root = NULL,
1805 };
1806 EXPORT_SYMBOL(iucv_if);
1807
1808 static enum cpuhp_state iucv_online;
1809 /**
1810 * iucv_init
1811 *
1812 * Allocates and initializes various data structures.
1813 */
iucv_init(void)1814 static int __init iucv_init(void)
1815 {
1816 int rc;
1817
1818 if (!MACHINE_IS_VM) {
1819 rc = -EPROTONOSUPPORT;
1820 goto out;
1821 }
1822 ctl_set_bit(0, 1);
1823 rc = iucv_query_maxconn();
1824 if (rc)
1825 goto out_ctl;
1826 rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1827 if (rc)
1828 goto out_ctl;
1829 iucv_root = root_device_register("iucv");
1830 if (IS_ERR(iucv_root)) {
1831 rc = PTR_ERR(iucv_root);
1832 goto out_int;
1833 }
1834
1835 rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare",
1836 iucv_cpu_prepare, iucv_cpu_dead);
1837 if (rc)
1838 goto out_dev;
1839 rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online",
1840 iucv_cpu_online, iucv_cpu_down_prep);
1841 if (rc < 0)
1842 goto out_prep;
1843 iucv_online = rc;
1844
1845 rc = register_reboot_notifier(&iucv_reboot_notifier);
1846 if (rc)
1847 goto out_remove_hp;
1848 ASCEBC(iucv_error_no_listener, 16);
1849 ASCEBC(iucv_error_no_memory, 16);
1850 ASCEBC(iucv_error_pathid, 16);
1851 iucv_available = 1;
1852 rc = bus_register(&iucv_bus);
1853 if (rc)
1854 goto out_reboot;
1855 iucv_if.root = iucv_root;
1856 iucv_if.bus = &iucv_bus;
1857 return 0;
1858
1859 out_reboot:
1860 unregister_reboot_notifier(&iucv_reboot_notifier);
1861 out_remove_hp:
1862 cpuhp_remove_state(iucv_online);
1863 out_prep:
1864 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
1865 out_dev:
1866 root_device_unregister(iucv_root);
1867 out_int:
1868 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1869 out_ctl:
1870 ctl_clear_bit(0, 1);
1871 out:
1872 return rc;
1873 }
1874
1875 /**
1876 * iucv_exit
1877 *
1878 * Frees everything allocated from iucv_init.
1879 */
iucv_exit(void)1880 static void __exit iucv_exit(void)
1881 {
1882 struct iucv_irq_list *p, *n;
1883
1884 spin_lock_irq(&iucv_queue_lock);
1885 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1886 kfree(p);
1887 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1888 kfree(p);
1889 spin_unlock_irq(&iucv_queue_lock);
1890 unregister_reboot_notifier(&iucv_reboot_notifier);
1891
1892 cpuhp_remove_state_nocalls(iucv_online);
1893 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
1894 root_device_unregister(iucv_root);
1895 bus_unregister(&iucv_bus);
1896 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1897 }
1898
1899 subsys_initcall(iucv_init);
1900 module_exit(iucv_exit);
1901
1902 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1903 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1904 MODULE_LICENSE("GPL");
1905