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1534c382 | 1 | /* |
75014550 | 2 | * Copyright IBM Corp. 2006, 2012 |
1534c382 MS |
3 | * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> |
4 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
5 | * Ralph Wuerthner <rwuerthn@de.ibm.com> | |
cb17a636 | 6 | * Felix Beck <felix.beck@de.ibm.com> |
6bed05bc | 7 | * Holger Dengler <hd@linux.vnet.ibm.com> |
1534c382 MS |
8 | * |
9 | * Adjunct processor bus. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | */ | |
25 | ||
136f7a1c MS |
26 | #define KMSG_COMPONENT "ap" |
27 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
28 | ||
62d146ff | 29 | #include <linux/kernel_stat.h> |
50a0d46c | 30 | #include <linux/moduleparam.h> |
1534c382 MS |
31 | #include <linux/init.h> |
32 | #include <linux/delay.h> | |
33 | #include <linux/err.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/workqueue.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1534c382 MS |
37 | #include <linux/notifier.h> |
38 | #include <linux/kthread.h> | |
39 | #include <linux/mutex.h> | |
83e9d5d2 | 40 | #include <linux/suspend.h> |
85eca850 | 41 | #include <asm/reset.h> |
cb17a636 | 42 | #include <asm/airq.h> |
60063497 | 43 | #include <linux/atomic.h> |
cb17a636 | 44 | #include <asm/isc.h> |
fe137230 FB |
45 | #include <linux/hrtimer.h> |
46 | #include <linux/ktime.h> | |
a0616cde | 47 | #include <asm/facility.h> |
5d26a105 | 48 | #include <linux/crypto.h> |
e28d2af4 | 49 | #include <linux/mod_devicetable.h> |
cccd85bf | 50 | #include <linux/debugfs.h> |
1534c382 MS |
51 | |
52 | #include "ap_bus.h" | |
0db78559 | 53 | #include "ap_asm.h" |
cccd85bf | 54 | #include "ap_debug.h" |
1534c382 | 55 | |
1749a81d | 56 | /* |
50a0d46c | 57 | * Module parameters; note though this file itself isn't modular. |
1534c382 MS |
58 | */ |
59 | int ap_domain_index = -1; /* Adjunct Processor Domain Index */ | |
fc1d3f02 | 60 | static DEFINE_SPINLOCK(ap_domain_lock); |
c1a42f49 | 61 | module_param_named(domain, ap_domain_index, int, S_IRUSR|S_IRGRP); |
1534c382 MS |
62 | MODULE_PARM_DESC(domain, "domain index for ap devices"); |
63 | EXPORT_SYMBOL(ap_domain_index); | |
64 | ||
b90b34c6 | 65 | static int ap_thread_flag = 0; |
c1a42f49 | 66 | module_param_named(poll_thread, ap_thread_flag, int, S_IRUSR|S_IRGRP); |
b90b34c6 | 67 | MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); |
1534c382 | 68 | |
e28d2af4 IT |
69 | static struct device *ap_root_device; |
70 | ||
71 | DEFINE_SPINLOCK(ap_list_lock); | |
72 | LIST_HEAD(ap_card_list); | |
73 | ||
75014550 | 74 | static struct ap_config_info *ap_configuration; |
e387753c | 75 | static bool initialised; |
1534c382 | 76 | |
cccd85bf HF |
77 | /* |
78 | * AP bus related debug feature things. | |
79 | */ | |
cccd85bf HF |
80 | debug_info_t *ap_dbf_info; |
81 | ||
1749a81d | 82 | /* |
8139b89d | 83 | * Workqueue timer for bus rescan. |
1534c382 | 84 | */ |
1534c382 MS |
85 | static struct timer_list ap_config_timer; |
86 | static int ap_config_time = AP_CONFIG_TIME; | |
3f3007af | 87 | static void ap_scan_bus(struct work_struct *); |
8139b89d | 88 | static DECLARE_WORK(ap_scan_work, ap_scan_bus); |
1534c382 | 89 | |
1749a81d | 90 | /* |
cb17a636 | 91 | * Tasklet & timer for AP request polling and interrupts |
1534c382 | 92 | */ |
3f3007af MS |
93 | static void ap_tasklet_fn(unsigned long); |
94 | static DECLARE_TASKLET(ap_tasklet, ap_tasklet_fn, 0); | |
1534c382 MS |
95 | static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); |
96 | static struct task_struct *ap_poll_kthread = NULL; | |
97 | static DEFINE_MUTEX(ap_poll_thread_mutex); | |
93521314 | 98 | static DEFINE_SPINLOCK(ap_poll_timer_lock); |
fe137230 FB |
99 | static struct hrtimer ap_poll_timer; |
100 | /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. | |
101 | * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ | |
102 | static unsigned long long poll_timeout = 250000; | |
1534c382 | 103 | |
772f5472 FB |
104 | /* Suspend flag */ |
105 | static int ap_suspend_flag; | |
889875a1 MS |
106 | /* Maximum domain id */ |
107 | static int ap_max_domain_id; | |
5314af69 FB |
108 | /* Flag to check if domain was set through module parameter domain=. This is |
109 | * important when supsend and resume is done in a z/VM environment where the | |
110 | * domain might change. */ | |
111 | static int user_set_domain = 0; | |
772f5472 FB |
112 | static struct bus_type ap_bus_type; |
113 | ||
f4eae94f | 114 | /* Adapter interrupt definitions */ |
3f3007af MS |
115 | static void ap_interrupt_handler(struct airq_struct *airq); |
116 | ||
f4eae94f MS |
117 | static int ap_airq_flag; |
118 | ||
119 | static struct airq_struct ap_airq = { | |
120 | .handler = ap_interrupt_handler, | |
121 | .isc = AP_ISC, | |
122 | }; | |
123 | ||
cb17a636 FB |
124 | /** |
125 | * ap_using_interrupts() - Returns non-zero if interrupt support is | |
126 | * available. | |
127 | */ | |
128 | static inline int ap_using_interrupts(void) | |
129 | { | |
f4eae94f | 130 | return ap_airq_flag; |
cb17a636 FB |
131 | } |
132 | ||
e28d2af4 IT |
133 | /** |
134 | * ap_airq_ptr() - Get the address of the adapter interrupt indicator | |
135 | * | |
136 | * Returns the address of the local-summary-indicator of the adapter | |
137 | * interrupt handler for AP, or NULL if adapter interrupts are not | |
138 | * available. | |
139 | */ | |
140 | void *ap_airq_ptr(void) | |
141 | { | |
142 | if (ap_using_interrupts()) | |
143 | return ap_airq.lsi_ptr; | |
144 | return NULL; | |
145 | } | |
146 | ||
cb17a636 FB |
147 | /** |
148 | * ap_interrupts_available(): Test if AP interrupts are available. | |
149 | * | |
150 | * Returns 1 if AP interrupts are available. | |
151 | */ | |
152 | static int ap_interrupts_available(void) | |
153 | { | |
86cd741b | 154 | return test_facility(65); |
cb17a636 FB |
155 | } |
156 | ||
75014550 HD |
157 | /** |
158 | * ap_configuration_available(): Test if AP configuration | |
159 | * information is available. | |
160 | * | |
161 | * Returns 1 if AP configuration information is available. | |
162 | */ | |
163 | static int ap_configuration_available(void) | |
164 | { | |
86cd741b | 165 | return test_facility(12); |
75014550 HD |
166 | } |
167 | ||
e7fc5146 TK |
168 | /** |
169 | * ap_apft_available(): Test if AP facilities test (APFT) | |
170 | * facility is available. | |
171 | * | |
172 | * Returns 1 if APFT is is available. | |
173 | */ | |
174 | static int ap_apft_available(void) | |
175 | { | |
176 | return test_facility(15); | |
177 | } | |
178 | ||
9a564108 HF |
179 | /* |
180 | * ap_qact_available(): Test if the PQAP(QACT) subfunction is available. | |
181 | * | |
182 | * Returns 1 if the QACT subfunction is available. | |
183 | */ | |
184 | static inline int ap_qact_available(void) | |
185 | { | |
186 | if (ap_configuration) | |
187 | return ap_configuration->qact; | |
188 | return 0; | |
189 | } | |
190 | ||
1534c382 | 191 | /** |
1749a81d FB |
192 | * ap_test_queue(): Test adjunct processor queue. |
193 | * @qid: The AP queue number | |
e7fc5146 | 194 | * @tbit: Test facilities bit |
6acbe21f | 195 | * @info: Pointer to queue descriptor |
1534c382 | 196 | * |
1749a81d | 197 | * Returns AP queue status structure. |
1534c382 | 198 | */ |
e7fc5146 TK |
199 | struct ap_queue_status ap_test_queue(ap_qid_t qid, |
200 | int tbit, | |
201 | unsigned long *info) | |
1534c382 | 202 | { |
e7fc5146 TK |
203 | if (tbit) |
204 | qid |= 1UL << 23; /* set T bit*/ | |
0db78559 | 205 | return ap_tapq(qid, info); |
75014550 | 206 | } |
e7fc5146 | 207 | EXPORT_SYMBOL(ap_test_queue); |
75014550 | 208 | |
050349b5 HF |
209 | /* |
210 | * ap_query_configuration(): Fetch cryptographic config info | |
211 | * | |
212 | * Returns the ap configuration info fetched via PQAP(QCI). | |
213 | * On success 0 is returned, on failure a negative errno | |
214 | * is returned, e.g. if the PQAP(QCI) instruction is not | |
215 | * available, the return value will be -EOPNOTSUPP. | |
216 | */ | |
217 | int ap_query_configuration(struct ap_config_info *info) | |
11d37673 | 218 | { |
050349b5 | 219 | if (!ap_configuration_available()) |
11d37673 | 220 | return -EOPNOTSUPP; |
050349b5 HF |
221 | if (!info) |
222 | return -EINVAL; | |
223 | return ap_qci(info); | |
11d37673 | 224 | } |
050349b5 | 225 | EXPORT_SYMBOL(ap_query_configuration); |
11d37673 | 226 | |
889875a1 MS |
227 | /** |
228 | * ap_init_configuration(): Allocate and query configuration array. | |
229 | */ | |
230 | static void ap_init_configuration(void) | |
231 | { | |
232 | if (!ap_configuration_available()) | |
233 | return; | |
234 | ||
235 | ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL); | |
236 | if (!ap_configuration) | |
237 | return; | |
050349b5 | 238 | if (ap_query_configuration(ap_configuration) != 0) { |
889875a1 MS |
239 | kfree(ap_configuration); |
240 | ap_configuration = NULL; | |
241 | return; | |
242 | } | |
243 | } | |
244 | ||
245 | /* | |
246 | * ap_test_config(): helper function to extract the nrth bit | |
247 | * within the unsigned int array field. | |
248 | */ | |
249 | static inline int ap_test_config(unsigned int *field, unsigned int nr) | |
250 | { | |
251 | return ap_test_bit((field + (nr >> 5)), (nr & 0x1f)); | |
252 | } | |
253 | ||
254 | /* | |
255 | * ap_test_config_card_id(): Test, whether an AP card ID is configured. | |
256 | * @id AP card ID | |
257 | * | |
258 | * Returns 0 if the card is not configured | |
259 | * 1 if the card is configured or | |
260 | * if the configuration information is not available | |
261 | */ | |
262 | static inline int ap_test_config_card_id(unsigned int id) | |
263 | { | |
264 | if (!ap_configuration) /* QCI not supported */ | |
265 | return 1; | |
266 | return ap_test_config(ap_configuration->apm, id); | |
267 | } | |
268 | ||
269 | /* | |
270 | * ap_test_config_domain(): Test, whether an AP usage domain is configured. | |
271 | * @domain AP usage domain ID | |
272 | * | |
273 | * Returns 0 if the usage domain is not configured | |
274 | * 1 if the usage domain is configured or | |
275 | * if the configuration information is not available | |
276 | */ | |
277 | static inline int ap_test_config_domain(unsigned int domain) | |
278 | { | |
279 | if (!ap_configuration) /* QCI not supported */ | |
280 | return domain < 16; | |
281 | return ap_test_config(ap_configuration->aqm, domain); | |
282 | } | |
283 | ||
1534c382 | 284 | /** |
1749a81d FB |
285 | * ap_query_queue(): Check if an AP queue is available. |
286 | * @qid: The AP queue number | |
287 | * @queue_depth: Pointer to queue depth value | |
288 | * @device_type: Pointer to device type value | |
6acbe21f | 289 | * @facilities: Pointer to facility indicator |
1534c382 | 290 | */ |
6acbe21f MS |
291 | static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type, |
292 | unsigned int *facilities) | |
1534c382 MS |
293 | { |
294 | struct ap_queue_status status; | |
6acbe21f | 295 | unsigned long info; |
889875a1 MS |
296 | int nd; |
297 | ||
e28d2af4 | 298 | if (!ap_test_config_card_id(AP_QID_CARD(qid))) |
889875a1 | 299 | return -ENODEV; |
1534c382 | 300 | |
e7fc5146 | 301 | status = ap_test_queue(qid, ap_apft_available(), &info); |
c50a160c IT |
302 | switch (status.response_code) { |
303 | case AP_RESPONSE_NORMAL: | |
6acbe21f MS |
304 | *queue_depth = (int)(info & 0xff); |
305 | *device_type = (int)((info >> 24) & 0xff); | |
306 | *facilities = (unsigned int)(info >> 32); | |
889875a1 MS |
307 | /* Update maximum domain id */ |
308 | nd = (info >> 16) & 0xff; | |
c1c1368d | 309 | /* if N bit is available, z13 and newer */ |
889875a1 MS |
310 | if ((info & (1UL << 57)) && nd > 0) |
311 | ap_max_domain_id = nd; | |
c1c1368d IT |
312 | else /* older machine types */ |
313 | ap_max_domain_id = 15; | |
14878424 HF |
314 | switch (*device_type) { |
315 | /* For CEX2 and CEX3 the available functions | |
316 | * are not refrected by the facilities bits. | |
317 | * Instead it is coded into the type. So here | |
318 | * modify the function bits based on the type. | |
319 | */ | |
320 | case AP_DEVICE_TYPE_CEX2A: | |
321 | case AP_DEVICE_TYPE_CEX3A: | |
322 | *facilities |= 0x08000000; | |
323 | break; | |
324 | case AP_DEVICE_TYPE_CEX2C: | |
325 | case AP_DEVICE_TYPE_CEX3C: | |
326 | *facilities |= 0x10000000; | |
327 | break; | |
328 | default: | |
329 | break; | |
330 | } | |
c50a160c IT |
331 | return 0; |
332 | case AP_RESPONSE_Q_NOT_AVAIL: | |
333 | case AP_RESPONSE_DECONFIGURED: | |
334 | case AP_RESPONSE_CHECKSTOPPED: | |
335 | case AP_RESPONSE_INVALID_ADDRESS: | |
336 | return -ENODEV; | |
337 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
338 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
339 | case AP_RESPONSE_BUSY: | |
340 | return -EBUSY; | |
341 | default: | |
342 | BUG(); | |
1534c382 | 343 | } |
1534c382 MS |
344 | } |
345 | ||
e28d2af4 | 346 | void ap_wait(enum ap_wait wait) |
3f3007af MS |
347 | { |
348 | ktime_t hr_time; | |
349 | ||
350 | switch (wait) { | |
351 | case AP_WAIT_AGAIN: | |
352 | case AP_WAIT_INTERRUPT: | |
353 | if (ap_using_interrupts()) | |
354 | break; | |
355 | if (ap_poll_kthread) { | |
356 | wake_up(&ap_poll_wait); | |
357 | break; | |
358 | } | |
359 | /* Fall through */ | |
360 | case AP_WAIT_TIMEOUT: | |
361 | spin_lock_bh(&ap_poll_timer_lock); | |
362 | if (!hrtimer_is_queued(&ap_poll_timer)) { | |
8b0e1953 | 363 | hr_time = poll_timeout; |
3f3007af MS |
364 | hrtimer_forward_now(&ap_poll_timer, hr_time); |
365 | hrtimer_restart(&ap_poll_timer); | |
366 | } | |
367 | spin_unlock_bh(&ap_poll_timer_lock); | |
368 | break; | |
369 | case AP_WAIT_NONE: | |
370 | default: | |
371 | break; | |
372 | } | |
373 | } | |
374 | ||
3f3007af MS |
375 | /** |
376 | * ap_request_timeout(): Handling of request timeouts | |
cefbeb5d | 377 | * @t: timer making this callback |
3f3007af MS |
378 | * |
379 | * Handles request timeouts. | |
380 | */ | |
cefbeb5d | 381 | void ap_request_timeout(struct timer_list *t) |
3f3007af | 382 | { |
cefbeb5d | 383 | struct ap_queue *aq = from_timer(aq, t, timeout); |
3f3007af MS |
384 | |
385 | if (ap_suspend_flag) | |
386 | return; | |
e28d2af4 IT |
387 | spin_lock_bh(&aq->lock); |
388 | ap_wait(ap_sm_event(aq, AP_EVENT_TIMEOUT)); | |
389 | spin_unlock_bh(&aq->lock); | |
3f3007af MS |
390 | } |
391 | ||
392 | /** | |
393 | * ap_poll_timeout(): AP receive polling for finished AP requests. | |
394 | * @unused: Unused pointer. | |
395 | * | |
396 | * Schedules the AP tasklet using a high resolution timer. | |
397 | */ | |
398 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) | |
399 | { | |
400 | if (!ap_suspend_flag) | |
401 | tasklet_schedule(&ap_tasklet); | |
402 | return HRTIMER_NORESTART; | |
403 | } | |
404 | ||
405 | /** | |
406 | * ap_interrupt_handler() - Schedule ap_tasklet on interrupt | |
407 | * @airq: pointer to adapter interrupt descriptor | |
408 | */ | |
409 | static void ap_interrupt_handler(struct airq_struct *airq) | |
410 | { | |
411 | inc_irq_stat(IRQIO_APB); | |
412 | if (!ap_suspend_flag) | |
413 | tasklet_schedule(&ap_tasklet); | |
414 | } | |
415 | ||
416 | /** | |
417 | * ap_tasklet_fn(): Tasklet to poll all AP devices. | |
418 | * @dummy: Unused variable | |
419 | * | |
420 | * Poll all AP devices on the bus. | |
421 | */ | |
422 | static void ap_tasklet_fn(unsigned long dummy) | |
423 | { | |
e28d2af4 IT |
424 | struct ap_card *ac; |
425 | struct ap_queue *aq; | |
3f3007af MS |
426 | enum ap_wait wait = AP_WAIT_NONE; |
427 | ||
428 | /* Reset the indicator if interrupts are used. Thus new interrupts can | |
429 | * be received. Doing it in the beginning of the tasklet is therefor | |
430 | * important that no requests on any AP get lost. | |
431 | */ | |
432 | if (ap_using_interrupts()) | |
433 | xchg(ap_airq.lsi_ptr, 0); | |
434 | ||
e28d2af4 IT |
435 | spin_lock_bh(&ap_list_lock); |
436 | for_each_ap_card(ac) { | |
437 | for_each_ap_queue(aq, ac) { | |
438 | spin_lock_bh(&aq->lock); | |
439 | wait = min(wait, ap_sm_event_loop(aq, AP_EVENT_POLL)); | |
440 | spin_unlock_bh(&aq->lock); | |
441 | } | |
3f3007af | 442 | } |
e28d2af4 IT |
443 | spin_unlock_bh(&ap_list_lock); |
444 | ||
445 | ap_wait(wait); | |
af512ed0 RW |
446 | } |
447 | ||
9af3e04e MS |
448 | static int ap_pending_requests(void) |
449 | { | |
e28d2af4 IT |
450 | struct ap_card *ac; |
451 | struct ap_queue *aq; | |
452 | ||
453 | spin_lock_bh(&ap_list_lock); | |
454 | for_each_ap_card(ac) { | |
455 | for_each_ap_queue(aq, ac) { | |
456 | if (aq->queue_count == 0) | |
457 | continue; | |
458 | spin_unlock_bh(&ap_list_lock); | |
459 | return 1; | |
9af3e04e | 460 | } |
9af3e04e | 461 | } |
e28d2af4 IT |
462 | spin_unlock_bh(&ap_list_lock); |
463 | return 0; | |
9af3e04e MS |
464 | } |
465 | ||
83e9d5d2 MS |
466 | /** |
467 | * ap_poll_thread(): Thread that polls for finished requests. | |
468 | * @data: Unused pointer | |
469 | * | |
470 | * AP bus poll thread. The purpose of this thread is to poll for | |
471 | * finished requests in a loop if there is a "free" cpu - that is | |
472 | * a cpu that doesn't have anything better to do. The polling stops | |
473 | * as soon as there is another task or if all messages have been | |
474 | * delivered. | |
475 | */ | |
476 | static int ap_poll_thread(void *data) | |
477 | { | |
478 | DECLARE_WAITQUEUE(wait, current); | |
83e9d5d2 MS |
479 | |
480 | set_user_nice(current, MAX_NICE); | |
481 | set_freezable(); | |
482 | while (!kthread_should_stop()) { | |
483 | add_wait_queue(&ap_poll_wait, &wait); | |
484 | set_current_state(TASK_INTERRUPTIBLE); | |
9af3e04e | 485 | if (ap_suspend_flag || !ap_pending_requests()) { |
83e9d5d2 MS |
486 | schedule(); |
487 | try_to_freeze(); | |
488 | } | |
489 | set_current_state(TASK_RUNNING); | |
490 | remove_wait_queue(&ap_poll_wait, &wait); | |
83e9d5d2 MS |
491 | if (need_resched()) { |
492 | schedule(); | |
493 | try_to_freeze(); | |
494 | continue; | |
495 | } | |
3f3007af | 496 | ap_tasklet_fn(0); |
9af3e04e MS |
497 | } |
498 | ||
83e9d5d2 MS |
499 | return 0; |
500 | } | |
501 | ||
502 | static int ap_poll_thread_start(void) | |
503 | { | |
504 | int rc; | |
505 | ||
506 | if (ap_using_interrupts() || ap_poll_kthread) | |
507 | return 0; | |
508 | mutex_lock(&ap_poll_thread_mutex); | |
509 | ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); | |
510 | rc = PTR_RET(ap_poll_kthread); | |
511 | if (rc) | |
512 | ap_poll_kthread = NULL; | |
513 | mutex_unlock(&ap_poll_thread_mutex); | |
514 | return rc; | |
515 | } | |
516 | ||
517 | static void ap_poll_thread_stop(void) | |
518 | { | |
519 | if (!ap_poll_kthread) | |
520 | return; | |
521 | mutex_lock(&ap_poll_thread_mutex); | |
522 | kthread_stop(ap_poll_kthread); | |
523 | ap_poll_kthread = NULL; | |
524 | mutex_unlock(&ap_poll_thread_mutex); | |
525 | } | |
526 | ||
e28d2af4 IT |
527 | #define is_card_dev(x) ((x)->parent == ap_root_device) |
528 | #define is_queue_dev(x) ((x)->parent != ap_root_device) | |
1534c382 MS |
529 | |
530 | /** | |
1749a81d FB |
531 | * ap_bus_match() |
532 | * @dev: Pointer to device | |
533 | * @drv: Pointer to device_driver | |
534 | * | |
1534c382 MS |
535 | * AP bus driver registration/unregistration. |
536 | */ | |
537 | static int ap_bus_match(struct device *dev, struct device_driver *drv) | |
538 | { | |
1534c382 MS |
539 | struct ap_driver *ap_drv = to_ap_drv(drv); |
540 | struct ap_device_id *id; | |
541 | ||
1749a81d | 542 | /* |
1534c382 MS |
543 | * Compare device type of the device with the list of |
544 | * supported types of the device_driver. | |
545 | */ | |
546 | for (id = ap_drv->ids; id->match_flags; id++) { | |
e28d2af4 IT |
547 | if (is_card_dev(dev) && |
548 | id->match_flags & AP_DEVICE_ID_MATCH_CARD_TYPE && | |
549 | id->dev_type == to_ap_dev(dev)->device_type) | |
550 | return 1; | |
551 | if (is_queue_dev(dev) && | |
552 | id->match_flags & AP_DEVICE_ID_MATCH_QUEUE_TYPE && | |
553 | id->dev_type == to_ap_dev(dev)->device_type) | |
554 | return 1; | |
1534c382 MS |
555 | } |
556 | return 0; | |
557 | } | |
558 | ||
559 | /** | |
1749a81d FB |
560 | * ap_uevent(): Uevent function for AP devices. |
561 | * @dev: Pointer to device | |
562 | * @env: Pointer to kobj_uevent_env | |
563 | * | |
564 | * It sets up a single environment variable DEV_TYPE which contains the | |
565 | * hardware device type. | |
1534c382 | 566 | */ |
7eff2e7a | 567 | static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) |
1534c382 MS |
568 | { |
569 | struct ap_device *ap_dev = to_ap_dev(dev); | |
7eff2e7a | 570 | int retval = 0; |
1534c382 MS |
571 | |
572 | if (!ap_dev) | |
573 | return -ENODEV; | |
574 | ||
575 | /* Set up DEV_TYPE environment variable. */ | |
7eff2e7a | 576 | retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); |
bf62456e ER |
577 | if (retval) |
578 | return retval; | |
579 | ||
66a4263b | 580 | /* Add MODALIAS= */ |
7eff2e7a | 581 | retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); |
bf62456e | 582 | |
bf62456e | 583 | return retval; |
1534c382 MS |
584 | } |
585 | ||
3e488c95 | 586 | static int ap_dev_suspend(struct device *dev) |
772f5472 FB |
587 | { |
588 | struct ap_device *ap_dev = to_ap_dev(dev); | |
772f5472 | 589 | |
e28d2af4 IT |
590 | if (ap_dev->drv && ap_dev->drv->suspend) |
591 | ap_dev->drv->suspend(ap_dev); | |
592 | return 0; | |
593 | } | |
594 | ||
595 | static int ap_dev_resume(struct device *dev) | |
596 | { | |
597 | struct ap_device *ap_dev = to_ap_dev(dev); | |
598 | ||
599 | if (ap_dev->drv && ap_dev->drv->resume) | |
600 | ap_dev->drv->resume(ap_dev); | |
83e9d5d2 MS |
601 | return 0; |
602 | } | |
5314af69 | 603 | |
83e9d5d2 MS |
604 | static void ap_bus_suspend(void) |
605 | { | |
cccd85bf HF |
606 | AP_DBF(DBF_DEBUG, "ap_bus_suspend running\n"); |
607 | ||
83e9d5d2 MS |
608 | ap_suspend_flag = 1; |
609 | /* | |
610 | * Disable scanning for devices, thus we do not want to scan | |
611 | * for them after removing. | |
612 | */ | |
8139b89d | 613 | flush_work(&ap_scan_work); |
83e9d5d2 MS |
614 | tasklet_disable(&ap_tasklet); |
615 | } | |
616 | ||
e28d2af4 IT |
617 | static int __ap_card_devices_unregister(struct device *dev, void *dummy) |
618 | { | |
619 | if (is_card_dev(dev)) | |
620 | device_unregister(dev); | |
621 | return 0; | |
622 | } | |
623 | ||
624 | static int __ap_queue_devices_unregister(struct device *dev, void *dummy) | |
625 | { | |
626 | if (is_queue_dev(dev)) | |
627 | device_unregister(dev); | |
628 | return 0; | |
629 | } | |
630 | ||
631 | static int __ap_queue_devices_with_id_unregister(struct device *dev, void *data) | |
83e9d5d2 | 632 | { |
e28d2af4 IT |
633 | if (is_queue_dev(dev) && |
634 | AP_QID_CARD(to_ap_queue(dev)->qid) == (int)(long) data) | |
635 | device_unregister(dev); | |
83e9d5d2 MS |
636 | return 0; |
637 | } | |
638 | ||
639 | static void ap_bus_resume(void) | |
772f5472 | 640 | { |
f4eae94f | 641 | int rc; |
772f5472 | 642 | |
cccd85bf HF |
643 | AP_DBF(DBF_DEBUG, "ap_bus_resume running\n"); |
644 | ||
e28d2af4 IT |
645 | /* remove all queue devices */ |
646 | bus_for_each_dev(&ap_bus_type, NULL, NULL, | |
647 | __ap_queue_devices_unregister); | |
648 | /* remove all card devices */ | |
649 | bus_for_each_dev(&ap_bus_type, NULL, NULL, | |
650 | __ap_card_devices_unregister); | |
651 | ||
83e9d5d2 MS |
652 | /* Reset thin interrupt setting */ |
653 | if (ap_interrupts_available() && !ap_using_interrupts()) { | |
654 | rc = register_adapter_interrupt(&ap_airq); | |
655 | ap_airq_flag = (rc == 0); | |
5314af69 | 656 | } |
83e9d5d2 MS |
657 | if (!ap_interrupts_available() && ap_using_interrupts()) { |
658 | unregister_adapter_interrupt(&ap_airq); | |
659 | ap_airq_flag = 0; | |
660 | } | |
661 | /* Reset domain */ | |
662 | if (!user_set_domain) | |
663 | ap_domain_index = -1; | |
664 | /* Get things going again */ | |
665 | ap_suspend_flag = 0; | |
666 | if (ap_airq_flag) | |
667 | xchg(ap_airq.lsi_ptr, 0); | |
668 | tasklet_enable(&ap_tasklet); | |
8139b89d | 669 | queue_work(system_long_wq, &ap_scan_work); |
83e9d5d2 | 670 | } |
772f5472 | 671 | |
83e9d5d2 MS |
672 | static int ap_power_event(struct notifier_block *this, unsigned long event, |
673 | void *ptr) | |
674 | { | |
675 | switch (event) { | |
676 | case PM_HIBERNATION_PREPARE: | |
677 | case PM_SUSPEND_PREPARE: | |
678 | ap_bus_suspend(); | |
679 | break; | |
680 | case PM_POST_HIBERNATION: | |
681 | case PM_POST_SUSPEND: | |
682 | ap_bus_resume(); | |
683 | break; | |
684 | default: | |
685 | break; | |
686 | } | |
687 | return NOTIFY_DONE; | |
772f5472 | 688 | } |
83e9d5d2 MS |
689 | static struct notifier_block ap_power_notifier = { |
690 | .notifier_call = ap_power_event, | |
691 | }; | |
772f5472 | 692 | |
e28d2af4 | 693 | static SIMPLE_DEV_PM_OPS(ap_bus_pm_ops, ap_dev_suspend, ap_dev_resume); |
3e488c95 | 694 | |
1534c382 MS |
695 | static struct bus_type ap_bus_type = { |
696 | .name = "ap", | |
697 | .match = &ap_bus_match, | |
698 | .uevent = &ap_uevent, | |
3e488c95 | 699 | .pm = &ap_bus_pm_ops, |
1534c382 MS |
700 | }; |
701 | ||
702 | static int ap_device_probe(struct device *dev) | |
703 | { | |
704 | struct ap_device *ap_dev = to_ap_dev(dev); | |
3f3007af MS |
705 | struct ap_driver *ap_drv = to_ap_drv(dev->driver); |
706 | int rc; | |
666e68e0 | 707 | |
e3850508 HF |
708 | /* Add queue/card to list of active queues/cards */ |
709 | spin_lock_bh(&ap_list_lock); | |
710 | if (is_card_dev(dev)) | |
711 | list_add(&to_ap_card(dev)->list, &ap_card_list); | |
712 | else | |
713 | list_add(&to_ap_queue(dev)->list, | |
714 | &to_ap_queue(dev)->card->queues); | |
715 | spin_unlock_bh(&ap_list_lock); | |
716 | ||
3f3007af | 717 | ap_dev->drv = ap_drv; |
1534c382 | 718 | rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; |
e3850508 HF |
719 | |
720 | if (rc) { | |
721 | spin_lock_bh(&ap_list_lock); | |
722 | if (is_card_dev(dev)) | |
723 | list_del_init(&to_ap_card(dev)->list); | |
724 | else | |
725 | list_del_init(&to_ap_queue(dev)->list); | |
726 | spin_unlock_bh(&ap_list_lock); | |
3f3007af | 727 | ap_dev->drv = NULL; |
e3850508 HF |
728 | } |
729 | ||
1534c382 MS |
730 | return rc; |
731 | } | |
732 | ||
1534c382 MS |
733 | static int ap_device_remove(struct device *dev) |
734 | { | |
735 | struct ap_device *ap_dev = to_ap_dev(dev); | |
736 | struct ap_driver *ap_drv = ap_dev->drv; | |
737 | ||
e3850508 HF |
738 | if (ap_drv->remove) |
739 | ap_drv->remove(ap_dev); | |
740 | ||
741 | /* Remove queue/card from list of active queues/cards */ | |
e28d2af4 IT |
742 | spin_lock_bh(&ap_list_lock); |
743 | if (is_card_dev(dev)) | |
744 | list_del_init(&to_ap_card(dev)->list); | |
745 | else | |
746 | list_del_init(&to_ap_queue(dev)->list); | |
747 | spin_unlock_bh(&ap_list_lock); | |
e3850508 | 748 | |
1534c382 MS |
749 | return 0; |
750 | } | |
751 | ||
752 | int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, | |
753 | char *name) | |
754 | { | |
755 | struct device_driver *drv = &ap_drv->driver; | |
756 | ||
e387753c SS |
757 | if (!initialised) |
758 | return -ENODEV; | |
759 | ||
1534c382 MS |
760 | drv->bus = &ap_bus_type; |
761 | drv->probe = ap_device_probe; | |
762 | drv->remove = ap_device_remove; | |
763 | drv->owner = owner; | |
764 | drv->name = name; | |
765 | return driver_register(drv); | |
766 | } | |
767 | EXPORT_SYMBOL(ap_driver_register); | |
768 | ||
769 | void ap_driver_unregister(struct ap_driver *ap_drv) | |
770 | { | |
771 | driver_unregister(&ap_drv->driver); | |
772 | } | |
773 | EXPORT_SYMBOL(ap_driver_unregister); | |
774 | ||
dabecb29 HD |
775 | void ap_bus_force_rescan(void) |
776 | { | |
83e9d5d2 MS |
777 | if (ap_suspend_flag) |
778 | return; | |
56bbe686 | 779 | /* processing a asynchronous bus rescan */ |
fcd0d1f6 | 780 | del_timer(&ap_config_timer); |
8139b89d MS |
781 | queue_work(system_long_wq, &ap_scan_work); |
782 | flush_work(&ap_scan_work); | |
dabecb29 HD |
783 | } |
784 | EXPORT_SYMBOL(ap_bus_force_rescan); | |
785 | ||
1749a81d | 786 | /* |
1534c382 MS |
787 | * AP bus attributes. |
788 | */ | |
789 | static ssize_t ap_domain_show(struct bus_type *bus, char *buf) | |
790 | { | |
791 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); | |
792 | } | |
793 | ||
fc1d3f02 IT |
794 | static ssize_t ap_domain_store(struct bus_type *bus, |
795 | const char *buf, size_t count) | |
796 | { | |
797 | int domain; | |
798 | ||
799 | if (sscanf(buf, "%i\n", &domain) != 1 || | |
800 | domain < 0 || domain > ap_max_domain_id) | |
801 | return -EINVAL; | |
802 | spin_lock_bh(&ap_domain_lock); | |
803 | ap_domain_index = domain; | |
804 | spin_unlock_bh(&ap_domain_lock); | |
cccd85bf | 805 | |
ac994e80 | 806 | AP_DBF(DBF_DEBUG, "stored new default domain=%d\n", domain); |
cccd85bf | 807 | |
fc1d3f02 IT |
808 | return count; |
809 | } | |
810 | ||
811 | static BUS_ATTR(ap_domain, 0644, ap_domain_show, ap_domain_store); | |
1534c382 | 812 | |
91f3e3ea IT |
813 | static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf) |
814 | { | |
889875a1 MS |
815 | if (!ap_configuration) /* QCI not supported */ |
816 | return snprintf(buf, PAGE_SIZE, "not supported\n"); | |
e28d2af4 | 817 | |
889875a1 MS |
818 | return snprintf(buf, PAGE_SIZE, |
819 | "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", | |
91f3e3ea IT |
820 | ap_configuration->adm[0], ap_configuration->adm[1], |
821 | ap_configuration->adm[2], ap_configuration->adm[3], | |
822 | ap_configuration->adm[4], ap_configuration->adm[5], | |
823 | ap_configuration->adm[6], ap_configuration->adm[7]); | |
91f3e3ea IT |
824 | } |
825 | ||
826 | static BUS_ATTR(ap_control_domain_mask, 0444, | |
827 | ap_control_domain_mask_show, NULL); | |
828 | ||
e28d2af4 IT |
829 | static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf) |
830 | { | |
831 | if (!ap_configuration) /* QCI not supported */ | |
832 | return snprintf(buf, PAGE_SIZE, "not supported\n"); | |
833 | ||
834 | return snprintf(buf, PAGE_SIZE, | |
835 | "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", | |
836 | ap_configuration->aqm[0], ap_configuration->aqm[1], | |
837 | ap_configuration->aqm[2], ap_configuration->aqm[3], | |
838 | ap_configuration->aqm[4], ap_configuration->aqm[5], | |
839 | ap_configuration->aqm[6], ap_configuration->aqm[7]); | |
840 | } | |
841 | ||
842 | static BUS_ATTR(ap_usage_domain_mask, 0444, | |
843 | ap_usage_domain_mask_show, NULL); | |
844 | ||
1534c382 MS |
845 | static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) |
846 | { | |
847 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); | |
848 | } | |
849 | ||
cb17a636 FB |
850 | static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) |
851 | { | |
852 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
853 | ap_using_interrupts() ? 1 : 0); | |
854 | } | |
855 | ||
856 | static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); | |
857 | ||
1534c382 MS |
858 | static ssize_t ap_config_time_store(struct bus_type *bus, |
859 | const char *buf, size_t count) | |
860 | { | |
861 | int time; | |
862 | ||
863 | if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) | |
864 | return -EINVAL; | |
865 | ap_config_time = time; | |
fcd0d1f6 | 866 | mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); |
1534c382 MS |
867 | return count; |
868 | } | |
869 | ||
870 | static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); | |
871 | ||
872 | static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) | |
873 | { | |
874 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); | |
875 | } | |
876 | ||
877 | static ssize_t ap_poll_thread_store(struct bus_type *bus, | |
878 | const char *buf, size_t count) | |
879 | { | |
880 | int flag, rc; | |
881 | ||
882 | if (sscanf(buf, "%d\n", &flag) != 1) | |
883 | return -EINVAL; | |
884 | if (flag) { | |
885 | rc = ap_poll_thread_start(); | |
886 | if (rc) | |
83e9d5d2 MS |
887 | count = rc; |
888 | } else | |
1534c382 MS |
889 | ap_poll_thread_stop(); |
890 | return count; | |
891 | } | |
892 | ||
893 | static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); | |
894 | ||
fe137230 FB |
895 | static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) |
896 | { | |
897 | return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); | |
898 | } | |
899 | ||
900 | static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, | |
901 | size_t count) | |
902 | { | |
903 | unsigned long long time; | |
904 | ktime_t hr_time; | |
905 | ||
906 | /* 120 seconds = maximum poll interval */ | |
cb17a636 FB |
907 | if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || |
908 | time > 120000000000ULL) | |
fe137230 FB |
909 | return -EINVAL; |
910 | poll_timeout = time; | |
8b0e1953 | 911 | hr_time = poll_timeout; |
fe137230 | 912 | |
8cc2af7c IT |
913 | spin_lock_bh(&ap_poll_timer_lock); |
914 | hrtimer_cancel(&ap_poll_timer); | |
915 | hrtimer_set_expires(&ap_poll_timer, hr_time); | |
916 | hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); | |
917 | spin_unlock_bh(&ap_poll_timer_lock); | |
918 | ||
fe137230 FB |
919 | return count; |
920 | } | |
921 | ||
922 | static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); | |
923 | ||
5bc334bf IT |
924 | static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf) |
925 | { | |
889875a1 MS |
926 | int max_domain_id; |
927 | ||
928 | if (ap_configuration) | |
929 | max_domain_id = ap_max_domain_id ? : -1; | |
930 | else | |
5bc334bf | 931 | max_domain_id = 15; |
5bc334bf IT |
932 | return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id); |
933 | } | |
934 | ||
935 | static BUS_ATTR(ap_max_domain_id, 0444, ap_max_domain_id_show, NULL); | |
936 | ||
1534c382 MS |
937 | static struct bus_attribute *const ap_bus_attrs[] = { |
938 | &bus_attr_ap_domain, | |
91f3e3ea | 939 | &bus_attr_ap_control_domain_mask, |
e28d2af4 | 940 | &bus_attr_ap_usage_domain_mask, |
1534c382 MS |
941 | &bus_attr_config_time, |
942 | &bus_attr_poll_thread, | |
cb17a636 | 943 | &bus_attr_ap_interrupts, |
fe137230 | 944 | &bus_attr_poll_timeout, |
5bc334bf | 945 | &bus_attr_ap_max_domain_id, |
fe137230 | 946 | NULL, |
1534c382 MS |
947 | }; |
948 | ||
949 | /** | |
1749a81d FB |
950 | * ap_select_domain(): Select an AP domain. |
951 | * | |
952 | * Pick one of the 16 AP domains. | |
1534c382 | 953 | */ |
4d284cac | 954 | static int ap_select_domain(void) |
1534c382 | 955 | { |
6acbe21f MS |
956 | int count, max_count, best_domain; |
957 | struct ap_queue_status status; | |
958 | int i, j; | |
1534c382 | 959 | |
1749a81d | 960 | /* |
1534c382 MS |
961 | * We want to use a single domain. Either the one specified with |
962 | * the "domain=" parameter or the domain with the maximum number | |
963 | * of devices. | |
964 | */ | |
fc1d3f02 IT |
965 | spin_lock_bh(&ap_domain_lock); |
966 | if (ap_domain_index >= 0) { | |
1534c382 | 967 | /* Domain has already been selected. */ |
fc1d3f02 | 968 | spin_unlock_bh(&ap_domain_lock); |
1534c382 | 969 | return 0; |
fc1d3f02 | 970 | } |
1534c382 MS |
971 | best_domain = -1; |
972 | max_count = 0; | |
973 | for (i = 0; i < AP_DOMAINS; i++) { | |
75014550 HD |
974 | if (!ap_test_config_domain(i)) |
975 | continue; | |
1534c382 MS |
976 | count = 0; |
977 | for (j = 0; j < AP_DEVICES; j++) { | |
75014550 HD |
978 | if (!ap_test_config_card_id(j)) |
979 | continue; | |
e7fc5146 TK |
980 | status = ap_test_queue(AP_MKQID(j, i), |
981 | ap_apft_available(), | |
982 | NULL); | |
6acbe21f | 983 | if (status.response_code != AP_RESPONSE_NORMAL) |
1534c382 MS |
984 | continue; |
985 | count++; | |
986 | } | |
987 | if (count > max_count) { | |
988 | max_count = count; | |
989 | best_domain = i; | |
990 | } | |
991 | } | |
992 | if (best_domain >= 0){ | |
993 | ap_domain_index = best_domain; | |
ac994e80 | 994 | AP_DBF(DBF_DEBUG, "new ap_domain_index=%d\n", ap_domain_index); |
fc1d3f02 | 995 | spin_unlock_bh(&ap_domain_lock); |
1534c382 MS |
996 | return 0; |
997 | } | |
fc1d3f02 | 998 | spin_unlock_bh(&ap_domain_lock); |
1534c382 MS |
999 | return -ENODEV; |
1000 | } | |
1001 | ||
9a564108 HF |
1002 | /* |
1003 | * This function checks the type and returns either 0 for not | |
1004 | * supported or the highest compatible type value (which may | |
1005 | * include the input type value). | |
1006 | */ | |
1007 | static int ap_get_compatible_type(ap_qid_t qid, int rawtype, unsigned int func) | |
1008 | { | |
1009 | int comp_type = 0; | |
1010 | ||
1011 | /* < CEX2A is not supported */ | |
1012 | if (rawtype < AP_DEVICE_TYPE_CEX2A) | |
1013 | return 0; | |
1014 | /* up to CEX6 known and fully supported */ | |
1015 | if (rawtype <= AP_DEVICE_TYPE_CEX6) | |
1016 | return rawtype; | |
1017 | /* | |
1018 | * unknown new type > CEX6, check for compatibility | |
1019 | * to the highest known and supported type which is | |
1020 | * currently CEX6 with the help of the QACT function. | |
1021 | */ | |
1022 | if (ap_qact_available()) { | |
1023 | struct ap_queue_status status; | |
56c5c683 | 1024 | union ap_qact_ap_info apinfo = {0}; |
9a564108 HF |
1025 | |
1026 | apinfo.mode = (func >> 26) & 0x07; | |
1027 | apinfo.cat = AP_DEVICE_TYPE_CEX6; | |
1028 | status = ap_qact(qid, 0, &apinfo); | |
1029 | if (status.response_code == AP_RESPONSE_NORMAL | |
1030 | && apinfo.cat >= AP_DEVICE_TYPE_CEX2A | |
1031 | && apinfo.cat <= AP_DEVICE_TYPE_CEX6) | |
1032 | comp_type = apinfo.cat; | |
1033 | } | |
1034 | if (!comp_type) | |
1035 | AP_DBF(DBF_WARN, "queue=%02x.%04x unable to map type %d\n", | |
1036 | AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype); | |
1037 | else if (comp_type != rawtype) | |
1038 | AP_DBF(DBF_INFO, "queue=%02x.%04x map type %d to %d\n", | |
1039 | AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype, comp_type); | |
1040 | return comp_type; | |
1041 | } | |
1042 | ||
e28d2af4 IT |
1043 | /* |
1044 | * helper function to be used with bus_find_dev | |
1045 | * matches for the card device with the given id | |
1534c382 | 1046 | */ |
e28d2af4 | 1047 | static int __match_card_device_with_id(struct device *dev, void *data) |
1534c382 | 1048 | { |
e28d2af4 | 1049 | return is_card_dev(dev) && to_ap_card(dev)->id == (int)(long) data; |
1534c382 MS |
1050 | } |
1051 | ||
e28d2af4 IT |
1052 | /* helper function to be used with bus_find_dev |
1053 | * matches for the queue device with a given qid | |
1054 | */ | |
1055 | static int __match_queue_device_with_qid(struct device *dev, void *data) | |
1056 | { | |
1057 | return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long) data; | |
1058 | } | |
1059 | ||
1060 | /** | |
1061 | * ap_scan_bus(): Scan the AP bus for new devices | |
1062 | * Runs periodically, workqueue timer (ap_config_time) | |
1063 | */ | |
4927b3f7 | 1064 | static void ap_scan_bus(struct work_struct *unused) |
1534c382 | 1065 | { |
e28d2af4 IT |
1066 | struct ap_queue *aq; |
1067 | struct ap_card *ac; | |
1534c382 MS |
1068 | struct device *dev; |
1069 | ap_qid_t qid; | |
9a564108 HF |
1070 | int comp_type, depth = 0, type = 0; |
1071 | unsigned int func = 0; | |
ac994e80 | 1072 | int rc, id, dom, borked, domains, defdomdevs = 0; |
1534c382 | 1073 | |
cccd85bf HF |
1074 | AP_DBF(DBF_DEBUG, "ap_scan_bus running\n"); |
1075 | ||
050349b5 | 1076 | ap_query_configuration(ap_configuration); |
83e9d5d2 | 1077 | if (ap_select_domain() != 0) |
fcd0d1f6 | 1078 | goto out; |
889875a1 | 1079 | |
e28d2af4 IT |
1080 | for (id = 0; id < AP_DEVICES; id++) { |
1081 | /* check if device is registered */ | |
1534c382 | 1082 | dev = bus_find_device(&ap_bus_type, NULL, |
e28d2af4 IT |
1083 | (void *)(long) id, |
1084 | __match_card_device_with_id); | |
1085 | ac = dev ? to_ap_card(dev) : NULL; | |
1086 | if (!ap_test_config_card_id(id)) { | |
1087 | if (dev) { | |
1088 | /* Card device has been removed from | |
1089 | * configuration, remove the belonging | |
1090 | * queue devices. | |
1091 | */ | |
1092 | bus_for_each_dev(&ap_bus_type, NULL, | |
1093 | (void *)(long) id, | |
1094 | __ap_queue_devices_with_id_unregister); | |
1095 | /* now remove the card device */ | |
3f3007af | 1096 | device_unregister(dev); |
e28d2af4 IT |
1097 | put_device(dev); |
1098 | } | |
1534c382 MS |
1099 | continue; |
1100 | } | |
e28d2af4 IT |
1101 | /* According to the configuration there should be a card |
1102 | * device, so check if there is at least one valid queue | |
1103 | * and maybe create queue devices and the card device. | |
1104 | */ | |
1105 | domains = 0; | |
1106 | for (dom = 0; dom < AP_DOMAINS; dom++) { | |
1107 | qid = AP_MKQID(id, dom); | |
1108 | dev = bus_find_device(&ap_bus_type, NULL, | |
1109 | (void *)(long) qid, | |
1110 | __match_queue_device_with_qid); | |
1111 | aq = dev ? to_ap_queue(dev) : NULL; | |
1112 | if (!ap_test_config_domain(dom)) { | |
1113 | if (dev) { | |
1114 | /* Queue device exists but has been | |
1115 | * removed from configuration. | |
1116 | */ | |
1117 | device_unregister(dev); | |
1118 | put_device(dev); | |
1119 | } | |
1120 | continue; | |
1121 | } | |
9a564108 | 1122 | rc = ap_query_queue(qid, &depth, &type, &func); |
e28d2af4 IT |
1123 | if (dev) { |
1124 | spin_lock_bh(&aq->lock); | |
1125 | if (rc == -ENODEV || | |
1126 | /* adapter reconfiguration */ | |
9a564108 | 1127 | (ac && ac->functions != func)) |
e28d2af4 IT |
1128 | aq->state = AP_STATE_BORKED; |
1129 | borked = aq->state == AP_STATE_BORKED; | |
1130 | spin_unlock_bh(&aq->lock); | |
1131 | if (borked) /* Remove broken device */ | |
1132 | device_unregister(dev); | |
1133 | put_device(dev); | |
1134 | if (!borked) { | |
1135 | domains++; | |
ac994e80 HF |
1136 | if (dom == ap_domain_index) |
1137 | defdomdevs++; | |
e28d2af4 IT |
1138 | continue; |
1139 | } | |
1140 | } | |
1141 | if (rc) | |
1142 | continue; | |
9a564108 HF |
1143 | /* a new queue device is needed, check out comp type */ |
1144 | comp_type = ap_get_compatible_type(qid, type, func); | |
1145 | if (!comp_type) | |
1146 | continue; | |
1147 | /* maybe a card device needs to be created first */ | |
e28d2af4 | 1148 | if (!ac) { |
9a564108 HF |
1149 | ac = ap_card_create(id, depth, type, |
1150 | comp_type, func); | |
e28d2af4 IT |
1151 | if (!ac) |
1152 | continue; | |
1153 | ac->ap_dev.device.bus = &ap_bus_type; | |
1154 | ac->ap_dev.device.parent = ap_root_device; | |
1155 | dev_set_name(&ac->ap_dev.device, | |
1156 | "card%02x", id); | |
1157 | /* Register card with AP bus */ | |
1158 | rc = device_register(&ac->ap_dev.device); | |
1159 | if (rc) { | |
1160 | put_device(&ac->ap_dev.device); | |
1161 | ac = NULL; | |
1162 | break; | |
1163 | } | |
1164 | /* get it and thus adjust reference counter */ | |
1165 | get_device(&ac->ap_dev.device); | |
e28d2af4 IT |
1166 | } |
1167 | /* now create the new queue device */ | |
9a564108 | 1168 | aq = ap_queue_create(qid, comp_type); |
e28d2af4 IT |
1169 | if (!aq) |
1170 | continue; | |
1171 | aq->card = ac; | |
1172 | aq->ap_dev.device.bus = &ap_bus_type; | |
1173 | aq->ap_dev.device.parent = &ac->ap_dev.device; | |
1174 | dev_set_name(&aq->ap_dev.device, | |
1175 | "%02x.%04x", id, dom); | |
e28d2af4 IT |
1176 | /* Start with a device reset */ |
1177 | spin_lock_bh(&aq->lock); | |
1178 | ap_wait(ap_sm_event(aq, AP_EVENT_POLL)); | |
1179 | spin_unlock_bh(&aq->lock); | |
1180 | /* Register device */ | |
1181 | rc = device_register(&aq->ap_dev.device); | |
1182 | if (rc) { | |
e28d2af4 IT |
1183 | put_device(&aq->ap_dev.device); |
1184 | continue; | |
1185 | } | |
1186 | domains++; | |
ac994e80 HF |
1187 | if (dom == ap_domain_index) |
1188 | defdomdevs++; | |
e28d2af4 IT |
1189 | } /* end domain loop */ |
1190 | if (ac) { | |
1191 | /* remove card dev if there are no queue devices */ | |
1192 | if (!domains) | |
1193 | device_unregister(&ac->ap_dev.device); | |
1194 | put_device(&ac->ap_dev.device); | |
3f3007af | 1195 | } |
e28d2af4 | 1196 | } /* end device loop */ |
ac994e80 HF |
1197 | |
1198 | if (defdomdevs < 1) | |
1199 | AP_DBF(DBF_INFO, "no queue device with default domain %d available\n", | |
1200 | ap_domain_index); | |
1201 | ||
fcd0d1f6 MS |
1202 | out: |
1203 | mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); | |
1534c382 MS |
1204 | } |
1205 | ||
cefbeb5d | 1206 | static void ap_config_timeout(struct timer_list *unused) |
1534c382 | 1207 | { |
83e9d5d2 MS |
1208 | if (ap_suspend_flag) |
1209 | return; | |
8139b89d | 1210 | queue_work(system_long_wq, &ap_scan_work); |
1534c382 | 1211 | } |
13e742ba RW |
1212 | |
1213 | static void ap_reset_all(void) | |
85eca850 RW |
1214 | { |
1215 | int i, j; | |
1216 | ||
170387a8 IT |
1217 | for (i = 0; i < AP_DOMAINS; i++) { |
1218 | if (!ap_test_config_domain(i)) | |
1219 | continue; | |
1220 | for (j = 0; j < AP_DEVICES; j++) { | |
1221 | if (!ap_test_config_card_id(j)) | |
1222 | continue; | |
0db78559 | 1223 | ap_rapq(AP_MKQID(j, i)); |
170387a8 IT |
1224 | } |
1225 | } | |
85eca850 RW |
1226 | } |
1227 | ||
1228 | static struct reset_call ap_reset_call = { | |
13e742ba | 1229 | .fn = ap_reset_all, |
85eca850 RW |
1230 | }; |
1231 | ||
cccd85bf HF |
1232 | int __init ap_debug_init(void) |
1233 | { | |
cccd85bf HF |
1234 | ap_dbf_info = debug_register("ap", 1, 1, |
1235 | DBF_MAX_SPRINTF_ARGS * sizeof(long)); | |
1236 | debug_register_view(ap_dbf_info, &debug_sprintf_view); | |
1237 | debug_set_level(ap_dbf_info, DBF_ERR); | |
1238 | ||
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | void ap_debug_exit(void) | |
1243 | { | |
cccd85bf HF |
1244 | debug_unregister(ap_dbf_info); |
1245 | } | |
1246 | ||
1534c382 | 1247 | /** |
1749a81d FB |
1248 | * ap_module_init(): The module initialization code. |
1249 | * | |
1250 | * Initializes the module. | |
1534c382 MS |
1251 | */ |
1252 | int __init ap_module_init(void) | |
1253 | { | |
889875a1 | 1254 | int max_domain_id; |
1534c382 MS |
1255 | int rc, i; |
1256 | ||
cccd85bf HF |
1257 | rc = ap_debug_init(); |
1258 | if (rc) | |
1259 | return rc; | |
1260 | ||
889875a1 MS |
1261 | if (ap_instructions_available() != 0) { |
1262 | pr_warn("The hardware system does not support AP instructions\n"); | |
1263 | return -ENODEV; | |
1264 | } | |
1265 | ||
1266 | /* Get AP configuration data if available */ | |
1267 | ap_init_configuration(); | |
1268 | ||
1269 | if (ap_configuration) | |
ac994e80 HF |
1270 | max_domain_id = |
1271 | ap_max_domain_id ? ap_max_domain_id : AP_DOMAINS - 1; | |
889875a1 MS |
1272 | else |
1273 | max_domain_id = 15; | |
1274 | if (ap_domain_index < -1 || ap_domain_index > max_domain_id) { | |
1275 | pr_warn("%d is not a valid cryptographic domain\n", | |
1276 | ap_domain_index); | |
ac994e80 | 1277 | ap_domain_index = -1; |
1534c382 | 1278 | } |
5314af69 FB |
1279 | /* In resume callback we need to know if the user had set the domain. |
1280 | * If so, we can not just reset it. | |
1281 | */ | |
1282 | if (ap_domain_index >= 0) | |
1283 | user_set_domain = 1; | |
1284 | ||
cb17a636 | 1285 | if (ap_interrupts_available()) { |
f4eae94f MS |
1286 | rc = register_adapter_interrupt(&ap_airq); |
1287 | ap_airq_flag = (rc == 0); | |
cb17a636 FB |
1288 | } |
1289 | ||
85eca850 | 1290 | register_reset_call(&ap_reset_call); |
1534c382 MS |
1291 | |
1292 | /* Create /sys/bus/ap. */ | |
1293 | rc = bus_register(&ap_bus_type); | |
1294 | if (rc) | |
1295 | goto out; | |
1296 | for (i = 0; ap_bus_attrs[i]; i++) { | |
1297 | rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); | |
1298 | if (rc) | |
1299 | goto out_bus; | |
1300 | } | |
1301 | ||
1302 | /* Create /sys/devices/ap. */ | |
035da16f | 1303 | ap_root_device = root_device_register("ap"); |
ba8da213 | 1304 | rc = PTR_RET(ap_root_device); |
1534c382 MS |
1305 | if (rc) |
1306 | goto out_bus; | |
1307 | ||
1749a81d | 1308 | /* Setup the AP bus rescan timer. */ |
cefbeb5d | 1309 | timer_setup(&ap_config_timer, ap_config_timeout, 0); |
1534c382 | 1310 | |
3f3007af MS |
1311 | /* |
1312 | * Setup the high resultion poll timer. | |
fe137230 FB |
1313 | * If we are running under z/VM adjust polling to z/VM polling rate. |
1314 | */ | |
1315 | if (MACHINE_IS_VM) | |
1316 | poll_timeout = 1500000; | |
93521314 | 1317 | spin_lock_init(&ap_poll_timer_lock); |
fe137230 FB |
1318 | hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
1319 | ap_poll_timer.function = ap_poll_timeout; | |
1320 | ||
1534c382 MS |
1321 | /* Start the low priority AP bus poll thread. */ |
1322 | if (ap_thread_flag) { | |
1323 | rc = ap_poll_thread_start(); | |
1324 | if (rc) | |
1325 | goto out_work; | |
1326 | } | |
1327 | ||
83e9d5d2 MS |
1328 | rc = register_pm_notifier(&ap_power_notifier); |
1329 | if (rc) | |
1330 | goto out_pm; | |
1331 | ||
8139b89d | 1332 | queue_work(system_long_wq, &ap_scan_work); |
e387753c | 1333 | initialised = true; |
3f3007af | 1334 | |
1534c382 MS |
1335 | return 0; |
1336 | ||
83e9d5d2 MS |
1337 | out_pm: |
1338 | ap_poll_thread_stop(); | |
1534c382 | 1339 | out_work: |
fe137230 | 1340 | hrtimer_cancel(&ap_poll_timer); |
035da16f | 1341 | root_device_unregister(ap_root_device); |
1534c382 MS |
1342 | out_bus: |
1343 | while (i--) | |
1344 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1345 | bus_unregister(&ap_bus_type); | |
1346 | out: | |
85eca850 | 1347 | unregister_reset_call(&ap_reset_call); |
f4eae94f MS |
1348 | if (ap_using_interrupts()) |
1349 | unregister_adapter_interrupt(&ap_airq); | |
889875a1 | 1350 | kfree(ap_configuration); |
1534c382 MS |
1351 | return rc; |
1352 | } | |
50a0d46c | 1353 | device_initcall(ap_module_init); |