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e28d2af4 IT |
1 | /* |
2 | * Copyright IBM Corp. 2016 | |
3 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> | |
4 | * | |
5 | * Adjunct processor bus, queue related code. | |
6 | */ | |
7 | ||
8 | #define KMSG_COMPONENT "ap" | |
9 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
10 | ||
11 | #include <linux/init.h> | |
12 | #include <linux/slab.h> | |
13 | #include <asm/facility.h> | |
14 | ||
15 | #include "ap_bus.h" | |
16 | #include "ap_asm.h" | |
17 | ||
18 | /** | |
19 | * ap_queue_enable_interruption(): Enable interruption on an AP queue. | |
20 | * @qid: The AP queue number | |
21 | * @ind: the notification indicator byte | |
22 | * | |
23 | * Enables interruption on AP queue via ap_aqic(). Based on the return | |
24 | * value it waits a while and tests the AP queue if interrupts | |
25 | * have been switched on using ap_test_queue(). | |
26 | */ | |
27 | static int ap_queue_enable_interruption(struct ap_queue *aq, void *ind) | |
28 | { | |
29 | struct ap_queue_status status; | |
30 | ||
31 | status = ap_aqic(aq->qid, ind); | |
32 | switch (status.response_code) { | |
33 | case AP_RESPONSE_NORMAL: | |
34 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
35 | return 0; | |
36 | case AP_RESPONSE_Q_NOT_AVAIL: | |
37 | case AP_RESPONSE_DECONFIGURED: | |
38 | case AP_RESPONSE_CHECKSTOPPED: | |
39 | case AP_RESPONSE_INVALID_ADDRESS: | |
40 | pr_err("Registering adapter interrupts for AP device %02x.%04x failed\n", | |
41 | AP_QID_CARD(aq->qid), | |
42 | AP_QID_QUEUE(aq->qid)); | |
43 | return -EOPNOTSUPP; | |
44 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
45 | case AP_RESPONSE_BUSY: | |
46 | default: | |
47 | return -EBUSY; | |
48 | } | |
49 | } | |
50 | ||
51 | /** | |
52 | * __ap_send(): Send message to adjunct processor queue. | |
53 | * @qid: The AP queue number | |
54 | * @psmid: The program supplied message identifier | |
55 | * @msg: The message text | |
56 | * @length: The message length | |
57 | * @special: Special Bit | |
58 | * | |
59 | * Returns AP queue status structure. | |
60 | * Condition code 1 on NQAP can't happen because the L bit is 1. | |
61 | * Condition code 2 on NQAP also means the send is incomplete, | |
62 | * because a segment boundary was reached. The NQAP is repeated. | |
63 | */ | |
64 | static inline struct ap_queue_status | |
65 | __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length, | |
66 | unsigned int special) | |
67 | { | |
68 | if (special == 1) | |
69 | qid |= 0x400000UL; | |
70 | return ap_nqap(qid, psmid, msg, length); | |
71 | } | |
72 | ||
73 | int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
74 | { | |
75 | struct ap_queue_status status; | |
76 | ||
77 | status = __ap_send(qid, psmid, msg, length, 0); | |
78 | switch (status.response_code) { | |
79 | case AP_RESPONSE_NORMAL: | |
80 | return 0; | |
81 | case AP_RESPONSE_Q_FULL: | |
82 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
83 | return -EBUSY; | |
84 | case AP_RESPONSE_REQ_FAC_NOT_INST: | |
85 | return -EINVAL; | |
86 | default: /* Device is gone. */ | |
87 | return -ENODEV; | |
88 | } | |
89 | } | |
90 | EXPORT_SYMBOL(ap_send); | |
91 | ||
92 | int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
93 | { | |
94 | struct ap_queue_status status; | |
95 | ||
96 | if (msg == NULL) | |
97 | return -EINVAL; | |
98 | status = ap_dqap(qid, psmid, msg, length); | |
99 | switch (status.response_code) { | |
100 | case AP_RESPONSE_NORMAL: | |
101 | return 0; | |
102 | case AP_RESPONSE_NO_PENDING_REPLY: | |
103 | if (status.queue_empty) | |
104 | return -ENOENT; | |
105 | return -EBUSY; | |
106 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
107 | return -EBUSY; | |
108 | default: | |
109 | return -ENODEV; | |
110 | } | |
111 | } | |
112 | EXPORT_SYMBOL(ap_recv); | |
113 | ||
114 | /* State machine definitions and helpers */ | |
115 | ||
116 | static enum ap_wait ap_sm_nop(struct ap_queue *aq) | |
117 | { | |
118 | return AP_WAIT_NONE; | |
119 | } | |
120 | ||
121 | /** | |
122 | * ap_sm_recv(): Receive pending reply messages from an AP queue but do | |
123 | * not change the state of the device. | |
124 | * @aq: pointer to the AP queue | |
125 | * | |
126 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
127 | */ | |
128 | static struct ap_queue_status ap_sm_recv(struct ap_queue *aq) | |
129 | { | |
130 | struct ap_queue_status status; | |
131 | struct ap_message *ap_msg; | |
132 | ||
133 | status = ap_dqap(aq->qid, &aq->reply->psmid, | |
134 | aq->reply->message, aq->reply->length); | |
135 | switch (status.response_code) { | |
136 | case AP_RESPONSE_NORMAL: | |
137 | aq->queue_count--; | |
138 | if (aq->queue_count > 0) | |
139 | mod_timer(&aq->timeout, | |
140 | jiffies + aq->request_timeout); | |
141 | list_for_each_entry(ap_msg, &aq->pendingq, list) { | |
142 | if (ap_msg->psmid != aq->reply->psmid) | |
143 | continue; | |
144 | list_del_init(&ap_msg->list); | |
145 | aq->pendingq_count--; | |
146 | ap_msg->receive(aq, ap_msg, aq->reply); | |
147 | break; | |
148 | } | |
149 | case AP_RESPONSE_NO_PENDING_REPLY: | |
150 | if (!status.queue_empty || aq->queue_count <= 0) | |
151 | break; | |
152 | /* The card shouldn't forget requests but who knows. */ | |
153 | aq->queue_count = 0; | |
154 | list_splice_init(&aq->pendingq, &aq->requestq); | |
155 | aq->requestq_count += aq->pendingq_count; | |
156 | aq->pendingq_count = 0; | |
157 | break; | |
158 | default: | |
159 | break; | |
160 | } | |
161 | return status; | |
162 | } | |
163 | ||
164 | /** | |
165 | * ap_sm_read(): Receive pending reply messages from an AP queue. | |
166 | * @aq: pointer to the AP queue | |
167 | * | |
168 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
169 | */ | |
170 | static enum ap_wait ap_sm_read(struct ap_queue *aq) | |
171 | { | |
172 | struct ap_queue_status status; | |
173 | ||
174 | if (!aq->reply) | |
175 | return AP_WAIT_NONE; | |
176 | status = ap_sm_recv(aq); | |
177 | switch (status.response_code) { | |
178 | case AP_RESPONSE_NORMAL: | |
179 | if (aq->queue_count > 0) { | |
180 | aq->state = AP_STATE_WORKING; | |
181 | return AP_WAIT_AGAIN; | |
182 | } | |
183 | aq->state = AP_STATE_IDLE; | |
184 | return AP_WAIT_NONE; | |
185 | case AP_RESPONSE_NO_PENDING_REPLY: | |
186 | if (aq->queue_count > 0) | |
187 | return AP_WAIT_INTERRUPT; | |
188 | aq->state = AP_STATE_IDLE; | |
189 | return AP_WAIT_NONE; | |
190 | default: | |
191 | aq->state = AP_STATE_BORKED; | |
192 | return AP_WAIT_NONE; | |
193 | } | |
194 | } | |
195 | ||
196 | /** | |
197 | * ap_sm_suspend_read(): Receive pending reply messages from an AP queue | |
198 | * without changing the device state in between. In suspend mode we don't | |
199 | * allow sending new requests, therefore just fetch pending replies. | |
200 | * @aq: pointer to the AP queue | |
201 | * | |
202 | * Returns AP_WAIT_NONE or AP_WAIT_AGAIN | |
203 | */ | |
204 | static enum ap_wait ap_sm_suspend_read(struct ap_queue *aq) | |
205 | { | |
206 | struct ap_queue_status status; | |
207 | ||
208 | if (!aq->reply) | |
209 | return AP_WAIT_NONE; | |
210 | status = ap_sm_recv(aq); | |
211 | switch (status.response_code) { | |
212 | case AP_RESPONSE_NORMAL: | |
213 | if (aq->queue_count > 0) | |
214 | return AP_WAIT_AGAIN; | |
215 | /* fall through */ | |
216 | default: | |
217 | return AP_WAIT_NONE; | |
218 | } | |
219 | } | |
220 | ||
221 | /** | |
222 | * ap_sm_write(): Send messages from the request queue to an AP queue. | |
223 | * @aq: pointer to the AP queue | |
224 | * | |
225 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
226 | */ | |
227 | static enum ap_wait ap_sm_write(struct ap_queue *aq) | |
228 | { | |
229 | struct ap_queue_status status; | |
230 | struct ap_message *ap_msg; | |
231 | ||
232 | if (aq->requestq_count <= 0) | |
233 | return AP_WAIT_NONE; | |
234 | /* Start the next request on the queue. */ | |
235 | ap_msg = list_entry(aq->requestq.next, struct ap_message, list); | |
236 | status = __ap_send(aq->qid, ap_msg->psmid, | |
237 | ap_msg->message, ap_msg->length, ap_msg->special); | |
238 | switch (status.response_code) { | |
239 | case AP_RESPONSE_NORMAL: | |
240 | aq->queue_count++; | |
241 | if (aq->queue_count == 1) | |
242 | mod_timer(&aq->timeout, jiffies + aq->request_timeout); | |
243 | list_move_tail(&ap_msg->list, &aq->pendingq); | |
244 | aq->requestq_count--; | |
245 | aq->pendingq_count++; | |
246 | if (aq->queue_count < aq->card->queue_depth) { | |
247 | aq->state = AP_STATE_WORKING; | |
248 | return AP_WAIT_AGAIN; | |
249 | } | |
250 | /* fall through */ | |
251 | case AP_RESPONSE_Q_FULL: | |
252 | aq->state = AP_STATE_QUEUE_FULL; | |
253 | return AP_WAIT_INTERRUPT; | |
254 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
255 | aq->state = AP_STATE_RESET_WAIT; | |
256 | return AP_WAIT_TIMEOUT; | |
257 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
258 | case AP_RESPONSE_REQ_FAC_NOT_INST: | |
259 | list_del_init(&ap_msg->list); | |
260 | aq->requestq_count--; | |
261 | ap_msg->rc = -EINVAL; | |
262 | ap_msg->receive(aq, ap_msg, NULL); | |
263 | return AP_WAIT_AGAIN; | |
264 | default: | |
265 | aq->state = AP_STATE_BORKED; | |
266 | return AP_WAIT_NONE; | |
267 | } | |
268 | } | |
269 | ||
270 | /** | |
271 | * ap_sm_read_write(): Send and receive messages to/from an AP queue. | |
272 | * @aq: pointer to the AP queue | |
273 | * | |
274 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
275 | */ | |
276 | static enum ap_wait ap_sm_read_write(struct ap_queue *aq) | |
277 | { | |
278 | return min(ap_sm_read(aq), ap_sm_write(aq)); | |
279 | } | |
280 | ||
281 | /** | |
282 | * ap_sm_reset(): Reset an AP queue. | |
283 | * @qid: The AP queue number | |
284 | * | |
285 | * Submit the Reset command to an AP queue. | |
286 | */ | |
287 | static enum ap_wait ap_sm_reset(struct ap_queue *aq) | |
288 | { | |
289 | struct ap_queue_status status; | |
290 | ||
291 | status = ap_rapq(aq->qid); | |
292 | switch (status.response_code) { | |
293 | case AP_RESPONSE_NORMAL: | |
294 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
295 | aq->state = AP_STATE_RESET_WAIT; | |
296 | aq->interrupt = AP_INTR_DISABLED; | |
297 | return AP_WAIT_TIMEOUT; | |
298 | case AP_RESPONSE_BUSY: | |
299 | return AP_WAIT_TIMEOUT; | |
300 | case AP_RESPONSE_Q_NOT_AVAIL: | |
301 | case AP_RESPONSE_DECONFIGURED: | |
302 | case AP_RESPONSE_CHECKSTOPPED: | |
303 | default: | |
304 | aq->state = AP_STATE_BORKED; | |
305 | return AP_WAIT_NONE; | |
306 | } | |
307 | } | |
308 | ||
309 | /** | |
310 | * ap_sm_reset_wait(): Test queue for completion of the reset operation | |
311 | * @aq: pointer to the AP queue | |
312 | * | |
313 | * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0. | |
314 | */ | |
315 | static enum ap_wait ap_sm_reset_wait(struct ap_queue *aq) | |
316 | { | |
317 | struct ap_queue_status status; | |
318 | void *lsi_ptr; | |
319 | ||
320 | if (aq->queue_count > 0 && aq->reply) | |
321 | /* Try to read a completed message and get the status */ | |
322 | status = ap_sm_recv(aq); | |
323 | else | |
324 | /* Get the status with TAPQ */ | |
325 | status = ap_tapq(aq->qid, NULL); | |
326 | ||
327 | switch (status.response_code) { | |
328 | case AP_RESPONSE_NORMAL: | |
329 | lsi_ptr = ap_airq_ptr(); | |
330 | if (lsi_ptr && ap_queue_enable_interruption(aq, lsi_ptr) == 0) | |
331 | aq->state = AP_STATE_SETIRQ_WAIT; | |
332 | else | |
333 | aq->state = (aq->queue_count > 0) ? | |
334 | AP_STATE_WORKING : AP_STATE_IDLE; | |
335 | return AP_WAIT_AGAIN; | |
336 | case AP_RESPONSE_BUSY: | |
337 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
338 | return AP_WAIT_TIMEOUT; | |
339 | case AP_RESPONSE_Q_NOT_AVAIL: | |
340 | case AP_RESPONSE_DECONFIGURED: | |
341 | case AP_RESPONSE_CHECKSTOPPED: | |
342 | default: | |
343 | aq->state = AP_STATE_BORKED; | |
344 | return AP_WAIT_NONE; | |
345 | } | |
346 | } | |
347 | ||
348 | /** | |
349 | * ap_sm_setirq_wait(): Test queue for completion of the irq enablement | |
350 | * @aq: pointer to the AP queue | |
351 | * | |
352 | * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0. | |
353 | */ | |
354 | static enum ap_wait ap_sm_setirq_wait(struct ap_queue *aq) | |
355 | { | |
356 | struct ap_queue_status status; | |
357 | ||
358 | if (aq->queue_count > 0 && aq->reply) | |
359 | /* Try to read a completed message and get the status */ | |
360 | status = ap_sm_recv(aq); | |
361 | else | |
362 | /* Get the status with TAPQ */ | |
363 | status = ap_tapq(aq->qid, NULL); | |
364 | ||
365 | if (status.int_enabled == 1) { | |
366 | /* Irqs are now enabled */ | |
367 | aq->interrupt = AP_INTR_ENABLED; | |
368 | aq->state = (aq->queue_count > 0) ? | |
369 | AP_STATE_WORKING : AP_STATE_IDLE; | |
370 | } | |
371 | ||
372 | switch (status.response_code) { | |
373 | case AP_RESPONSE_NORMAL: | |
374 | if (aq->queue_count > 0) | |
375 | return AP_WAIT_AGAIN; | |
376 | /* fallthrough */ | |
377 | case AP_RESPONSE_NO_PENDING_REPLY: | |
378 | return AP_WAIT_TIMEOUT; | |
379 | default: | |
380 | aq->state = AP_STATE_BORKED; | |
381 | return AP_WAIT_NONE; | |
382 | } | |
383 | } | |
384 | ||
385 | /* | |
386 | * AP state machine jump table | |
387 | */ | |
388 | static ap_func_t *ap_jumptable[NR_AP_STATES][NR_AP_EVENTS] = { | |
389 | [AP_STATE_RESET_START] = { | |
390 | [AP_EVENT_POLL] = ap_sm_reset, | |
391 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
392 | }, | |
393 | [AP_STATE_RESET_WAIT] = { | |
394 | [AP_EVENT_POLL] = ap_sm_reset_wait, | |
395 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
396 | }, | |
397 | [AP_STATE_SETIRQ_WAIT] = { | |
398 | [AP_EVENT_POLL] = ap_sm_setirq_wait, | |
399 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
400 | }, | |
401 | [AP_STATE_IDLE] = { | |
402 | [AP_EVENT_POLL] = ap_sm_write, | |
403 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
404 | }, | |
405 | [AP_STATE_WORKING] = { | |
406 | [AP_EVENT_POLL] = ap_sm_read_write, | |
407 | [AP_EVENT_TIMEOUT] = ap_sm_reset, | |
408 | }, | |
409 | [AP_STATE_QUEUE_FULL] = { | |
410 | [AP_EVENT_POLL] = ap_sm_read, | |
411 | [AP_EVENT_TIMEOUT] = ap_sm_reset, | |
412 | }, | |
413 | [AP_STATE_SUSPEND_WAIT] = { | |
414 | [AP_EVENT_POLL] = ap_sm_suspend_read, | |
415 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
416 | }, | |
417 | [AP_STATE_BORKED] = { | |
418 | [AP_EVENT_POLL] = ap_sm_nop, | |
419 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
420 | }, | |
421 | }; | |
422 | ||
423 | enum ap_wait ap_sm_event(struct ap_queue *aq, enum ap_event event) | |
424 | { | |
425 | return ap_jumptable[aq->state][event](aq); | |
426 | } | |
427 | ||
428 | enum ap_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_event event) | |
429 | { | |
430 | enum ap_wait wait; | |
431 | ||
432 | while ((wait = ap_sm_event(aq, event)) == AP_WAIT_AGAIN) | |
433 | ; | |
434 | return wait; | |
435 | } | |
436 | ||
437 | /* | |
438 | * Power management for queue devices | |
439 | */ | |
440 | void ap_queue_suspend(struct ap_device *ap_dev) | |
441 | { | |
442 | struct ap_queue *aq = to_ap_queue(&ap_dev->device); | |
443 | ||
444 | /* Poll on the device until all requests are finished. */ | |
445 | spin_lock_bh(&aq->lock); | |
446 | aq->state = AP_STATE_SUSPEND_WAIT; | |
447 | while (ap_sm_event(aq, AP_EVENT_POLL) != AP_WAIT_NONE) | |
448 | ; | |
449 | aq->state = AP_STATE_BORKED; | |
450 | spin_unlock_bh(&aq->lock); | |
451 | } | |
452 | EXPORT_SYMBOL(ap_queue_suspend); | |
453 | ||
454 | void ap_queue_resume(struct ap_device *ap_dev) | |
455 | { | |
456 | } | |
457 | EXPORT_SYMBOL(ap_queue_resume); | |
458 | ||
459 | /* | |
460 | * AP queue related attributes. | |
461 | */ | |
d0360d7b HF |
462 | static ssize_t ap_req_count_show(struct device *dev, |
463 | struct device_attribute *attr, | |
464 | char *buf) | |
e28d2af4 IT |
465 | { |
466 | struct ap_queue *aq = to_ap_queue(dev); | |
467 | unsigned int req_cnt; | |
468 | ||
469 | spin_lock_bh(&aq->lock); | |
470 | req_cnt = aq->total_request_count; | |
471 | spin_unlock_bh(&aq->lock); | |
472 | return snprintf(buf, PAGE_SIZE, "%d\n", req_cnt); | |
473 | } | |
474 | ||
d0360d7b HF |
475 | static ssize_t ap_req_count_store(struct device *dev, |
476 | struct device_attribute *attr, | |
477 | const char *buf, size_t count) | |
478 | { | |
479 | struct ap_queue *aq = to_ap_queue(dev); | |
480 | ||
481 | spin_lock_bh(&aq->lock); | |
482 | aq->total_request_count = 0; | |
483 | spin_unlock_bh(&aq->lock); | |
484 | ||
485 | return count; | |
486 | } | |
487 | ||
488 | static DEVICE_ATTR(request_count, 0644, ap_req_count_show, ap_req_count_store); | |
e28d2af4 IT |
489 | |
490 | static ssize_t ap_requestq_count_show(struct device *dev, | |
491 | struct device_attribute *attr, char *buf) | |
492 | { | |
493 | struct ap_queue *aq = to_ap_queue(dev); | |
494 | unsigned int reqq_cnt = 0; | |
495 | ||
496 | spin_lock_bh(&aq->lock); | |
497 | reqq_cnt = aq->requestq_count; | |
498 | spin_unlock_bh(&aq->lock); | |
499 | return snprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt); | |
500 | } | |
501 | ||
502 | static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL); | |
503 | ||
504 | static ssize_t ap_pendingq_count_show(struct device *dev, | |
505 | struct device_attribute *attr, char *buf) | |
506 | { | |
507 | struct ap_queue *aq = to_ap_queue(dev); | |
508 | unsigned int penq_cnt = 0; | |
509 | ||
510 | spin_lock_bh(&aq->lock); | |
511 | penq_cnt = aq->pendingq_count; | |
512 | spin_unlock_bh(&aq->lock); | |
513 | return snprintf(buf, PAGE_SIZE, "%d\n", penq_cnt); | |
514 | } | |
515 | ||
516 | static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL); | |
517 | ||
518 | static ssize_t ap_reset_show(struct device *dev, | |
519 | struct device_attribute *attr, char *buf) | |
520 | { | |
521 | struct ap_queue *aq = to_ap_queue(dev); | |
522 | int rc = 0; | |
523 | ||
524 | spin_lock_bh(&aq->lock); | |
525 | switch (aq->state) { | |
526 | case AP_STATE_RESET_START: | |
527 | case AP_STATE_RESET_WAIT: | |
528 | rc = snprintf(buf, PAGE_SIZE, "Reset in progress.\n"); | |
529 | break; | |
530 | case AP_STATE_WORKING: | |
531 | case AP_STATE_QUEUE_FULL: | |
532 | rc = snprintf(buf, PAGE_SIZE, "Reset Timer armed.\n"); | |
533 | break; | |
534 | default: | |
535 | rc = snprintf(buf, PAGE_SIZE, "No Reset Timer set.\n"); | |
536 | } | |
537 | spin_unlock_bh(&aq->lock); | |
538 | return rc; | |
539 | } | |
540 | ||
541 | static DEVICE_ATTR(reset, 0444, ap_reset_show, NULL); | |
542 | ||
543 | static ssize_t ap_interrupt_show(struct device *dev, | |
544 | struct device_attribute *attr, char *buf) | |
545 | { | |
546 | struct ap_queue *aq = to_ap_queue(dev); | |
547 | int rc = 0; | |
548 | ||
549 | spin_lock_bh(&aq->lock); | |
550 | if (aq->state == AP_STATE_SETIRQ_WAIT) | |
551 | rc = snprintf(buf, PAGE_SIZE, "Enable Interrupt pending.\n"); | |
552 | else if (aq->interrupt == AP_INTR_ENABLED) | |
553 | rc = snprintf(buf, PAGE_SIZE, "Interrupts enabled.\n"); | |
554 | else | |
555 | rc = snprintf(buf, PAGE_SIZE, "Interrupts disabled.\n"); | |
556 | spin_unlock_bh(&aq->lock); | |
557 | return rc; | |
558 | } | |
559 | ||
560 | static DEVICE_ATTR(interrupt, 0444, ap_interrupt_show, NULL); | |
561 | ||
562 | static struct attribute *ap_queue_dev_attrs[] = { | |
563 | &dev_attr_request_count.attr, | |
564 | &dev_attr_requestq_count.attr, | |
565 | &dev_attr_pendingq_count.attr, | |
566 | &dev_attr_reset.attr, | |
567 | &dev_attr_interrupt.attr, | |
568 | NULL | |
569 | }; | |
570 | ||
571 | static struct attribute_group ap_queue_dev_attr_group = { | |
572 | .attrs = ap_queue_dev_attrs | |
573 | }; | |
574 | ||
575 | static const struct attribute_group *ap_queue_dev_attr_groups[] = { | |
576 | &ap_queue_dev_attr_group, | |
577 | NULL | |
578 | }; | |
579 | ||
227374b1 | 580 | static struct device_type ap_queue_type = { |
e28d2af4 IT |
581 | .name = "ap_queue", |
582 | .groups = ap_queue_dev_attr_groups, | |
583 | }; | |
584 | ||
585 | static void ap_queue_device_release(struct device *dev) | |
586 | { | |
587 | kfree(to_ap_queue(dev)); | |
588 | } | |
589 | ||
590 | struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type) | |
591 | { | |
592 | struct ap_queue *aq; | |
593 | ||
594 | aq = kzalloc(sizeof(*aq), GFP_KERNEL); | |
595 | if (!aq) | |
596 | return NULL; | |
597 | aq->ap_dev.device.release = ap_queue_device_release; | |
598 | aq->ap_dev.device.type = &ap_queue_type; | |
599 | aq->ap_dev.device_type = device_type; | |
600 | /* CEX6 toleration: map to CEX5 */ | |
601 | if (device_type == AP_DEVICE_TYPE_CEX6) | |
602 | aq->ap_dev.device_type = AP_DEVICE_TYPE_CEX5; | |
603 | aq->qid = qid; | |
604 | aq->state = AP_STATE_RESET_START; | |
605 | aq->interrupt = AP_INTR_DISABLED; | |
606 | spin_lock_init(&aq->lock); | |
607 | INIT_LIST_HEAD(&aq->pendingq); | |
608 | INIT_LIST_HEAD(&aq->requestq); | |
609 | setup_timer(&aq->timeout, ap_request_timeout, (unsigned long) aq); | |
610 | ||
611 | return aq; | |
612 | } | |
613 | ||
614 | void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *reply) | |
615 | { | |
616 | aq->reply = reply; | |
617 | ||
618 | spin_lock_bh(&aq->lock); | |
619 | ap_wait(ap_sm_event(aq, AP_EVENT_POLL)); | |
620 | spin_unlock_bh(&aq->lock); | |
621 | } | |
622 | EXPORT_SYMBOL(ap_queue_init_reply); | |
623 | ||
624 | /** | |
625 | * ap_queue_message(): Queue a request to an AP device. | |
626 | * @aq: The AP device to queue the message to | |
627 | * @ap_msg: The message that is to be added | |
628 | */ | |
629 | void ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg) | |
630 | { | |
631 | /* For asynchronous message handling a valid receive-callback | |
632 | * is required. | |
633 | */ | |
634 | BUG_ON(!ap_msg->receive); | |
635 | ||
636 | spin_lock_bh(&aq->lock); | |
637 | /* Queue the message. */ | |
638 | list_add_tail(&ap_msg->list, &aq->requestq); | |
639 | aq->requestq_count++; | |
640 | aq->total_request_count++; | |
e47de21d | 641 | atomic_inc(&aq->card->total_request_count); |
e28d2af4 IT |
642 | /* Send/receive as many request from the queue as possible. */ |
643 | ap_wait(ap_sm_event_loop(aq, AP_EVENT_POLL)); | |
644 | spin_unlock_bh(&aq->lock); | |
645 | } | |
646 | EXPORT_SYMBOL(ap_queue_message); | |
647 | ||
648 | /** | |
649 | * ap_cancel_message(): Cancel a crypto request. | |
650 | * @aq: The AP device that has the message queued | |
651 | * @ap_msg: The message that is to be removed | |
652 | * | |
653 | * Cancel a crypto request. This is done by removing the request | |
654 | * from the device pending or request queue. Note that the | |
655 | * request stays on the AP queue. When it finishes the message | |
656 | * reply will be discarded because the psmid can't be found. | |
657 | */ | |
658 | void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg) | |
659 | { | |
660 | struct ap_message *tmp; | |
661 | ||
662 | spin_lock_bh(&aq->lock); | |
663 | if (!list_empty(&ap_msg->list)) { | |
664 | list_for_each_entry(tmp, &aq->pendingq, list) | |
665 | if (tmp->psmid == ap_msg->psmid) { | |
666 | aq->pendingq_count--; | |
667 | goto found; | |
668 | } | |
669 | aq->requestq_count--; | |
670 | found: | |
671 | list_del_init(&ap_msg->list); | |
672 | } | |
673 | spin_unlock_bh(&aq->lock); | |
674 | } | |
675 | EXPORT_SYMBOL(ap_cancel_message); | |
676 | ||
677 | /** | |
678 | * __ap_flush_queue(): Flush requests. | |
679 | * @aq: Pointer to the AP queue | |
680 | * | |
681 | * Flush all requests from the request/pending queue of an AP device. | |
682 | */ | |
683 | static void __ap_flush_queue(struct ap_queue *aq) | |
684 | { | |
685 | struct ap_message *ap_msg, *next; | |
686 | ||
687 | list_for_each_entry_safe(ap_msg, next, &aq->pendingq, list) { | |
688 | list_del_init(&ap_msg->list); | |
689 | aq->pendingq_count--; | |
690 | ap_msg->rc = -EAGAIN; | |
691 | ap_msg->receive(aq, ap_msg, NULL); | |
692 | } | |
693 | list_for_each_entry_safe(ap_msg, next, &aq->requestq, list) { | |
694 | list_del_init(&ap_msg->list); | |
695 | aq->requestq_count--; | |
696 | ap_msg->rc = -EAGAIN; | |
697 | ap_msg->receive(aq, ap_msg, NULL); | |
698 | } | |
699 | } | |
700 | ||
701 | void ap_flush_queue(struct ap_queue *aq) | |
702 | { | |
703 | spin_lock_bh(&aq->lock); | |
704 | __ap_flush_queue(aq); | |
705 | spin_unlock_bh(&aq->lock); | |
706 | } | |
707 | EXPORT_SYMBOL(ap_flush_queue); | |
708 | ||
709 | void ap_queue_remove(struct ap_queue *aq) | |
710 | { | |
711 | ap_flush_queue(aq); | |
712 | del_timer_sync(&aq->timeout); | |
713 | } | |
714 | EXPORT_SYMBOL(ap_queue_remove); |