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1534c382 MS |
1 | /* |
2 | * linux/drivers/s390/crypto/ap_bus.c | |
3 | * | |
4 | * Copyright (C) 2006 IBM Corporation | |
5 | * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Ralph Wuerthner <rwuerthn@de.ibm.com> | |
cb17a636 | 8 | * Felix Beck <felix.beck@de.ibm.com> |
1534c382 MS |
9 | * |
10 | * Adjunct processor bus. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2, or (at your option) | |
15 | * any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | */ | |
26 | ||
136f7a1c MS |
27 | #define KMSG_COMPONENT "ap" |
28 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
29 | ||
1534c382 MS |
30 | #include <linux/module.h> |
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> | |
36 | #include <linux/notifier.h> | |
37 | #include <linux/kthread.h> | |
38 | #include <linux/mutex.h> | |
85eca850 | 39 | #include <asm/reset.h> |
cb17a636 FB |
40 | #include <asm/airq.h> |
41 | #include <asm/atomic.h> | |
42 | #include <asm/system.h> | |
43 | #include <asm/isc.h> | |
fe137230 FB |
44 | #include <linux/hrtimer.h> |
45 | #include <linux/ktime.h> | |
1534c382 MS |
46 | |
47 | #include "ap_bus.h" | |
48 | ||
49 | /* Some prototypes. */ | |
4927b3f7 | 50 | static void ap_scan_bus(struct work_struct *); |
1534c382 | 51 | static void ap_poll_all(unsigned long); |
fe137230 | 52 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *); |
1534c382 MS |
53 | static int ap_poll_thread_start(void); |
54 | static void ap_poll_thread_stop(void); | |
af512ed0 | 55 | static void ap_request_timeout(unsigned long); |
cb17a636 | 56 | static inline void ap_schedule_poll_timer(void); |
772f5472 FB |
57 | static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags); |
58 | static int ap_device_remove(struct device *dev); | |
59 | static int ap_device_probe(struct device *dev); | |
60 | static void ap_interrupt_handler(void *unused1, void *unused2); | |
61 | static void ap_reset(struct ap_device *ap_dev); | |
62 | static void ap_config_timeout(unsigned long ptr); | |
5314af69 | 63 | static int ap_select_domain(void); |
1534c382 | 64 | |
1749a81d | 65 | /* |
1534c382 MS |
66 | * Module description. |
67 | */ | |
68 | MODULE_AUTHOR("IBM Corporation"); | |
69 | MODULE_DESCRIPTION("Adjunct Processor Bus driver, " | |
70 | "Copyright 2006 IBM Corporation"); | |
71 | MODULE_LICENSE("GPL"); | |
72 | ||
1749a81d | 73 | /* |
1534c382 MS |
74 | * Module parameter |
75 | */ | |
76 | int ap_domain_index = -1; /* Adjunct Processor Domain Index */ | |
77 | module_param_named(domain, ap_domain_index, int, 0000); | |
78 | MODULE_PARM_DESC(domain, "domain index for ap devices"); | |
79 | EXPORT_SYMBOL(ap_domain_index); | |
80 | ||
b90b34c6 | 81 | static int ap_thread_flag = 0; |
1534c382 | 82 | module_param_named(poll_thread, ap_thread_flag, int, 0000); |
b90b34c6 | 83 | MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); |
1534c382 MS |
84 | |
85 | static struct device *ap_root_device = NULL; | |
43c207e6 | 86 | static DEFINE_SPINLOCK(ap_device_list_lock); |
cf352ce0 | 87 | static LIST_HEAD(ap_device_list); |
1534c382 | 88 | |
1749a81d | 89 | /* |
1534c382 MS |
90 | * Workqueue & timer for bus rescan. |
91 | */ | |
92 | static struct workqueue_struct *ap_work_queue; | |
93 | static struct timer_list ap_config_timer; | |
94 | static int ap_config_time = AP_CONFIG_TIME; | |
4927b3f7 | 95 | static DECLARE_WORK(ap_config_work, ap_scan_bus); |
1534c382 | 96 | |
1749a81d | 97 | /* |
cb17a636 | 98 | * Tasklet & timer for AP request polling and interrupts |
1534c382 | 99 | */ |
1534c382 MS |
100 | static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0); |
101 | static atomic_t ap_poll_requests = ATOMIC_INIT(0); | |
102 | static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); | |
103 | static struct task_struct *ap_poll_kthread = NULL; | |
104 | static DEFINE_MUTEX(ap_poll_thread_mutex); | |
cb17a636 | 105 | static void *ap_interrupt_indicator; |
fe137230 FB |
106 | static struct hrtimer ap_poll_timer; |
107 | /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. | |
108 | * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ | |
109 | static unsigned long long poll_timeout = 250000; | |
1534c382 | 110 | |
772f5472 FB |
111 | /* Suspend flag */ |
112 | static int ap_suspend_flag; | |
5314af69 FB |
113 | /* Flag to check if domain was set through module parameter domain=. This is |
114 | * important when supsend and resume is done in a z/VM environment where the | |
115 | * domain might change. */ | |
116 | static int user_set_domain = 0; | |
772f5472 FB |
117 | static struct bus_type ap_bus_type; |
118 | ||
cb17a636 FB |
119 | /** |
120 | * ap_using_interrupts() - Returns non-zero if interrupt support is | |
121 | * available. | |
122 | */ | |
123 | static inline int ap_using_interrupts(void) | |
124 | { | |
125 | return ap_interrupt_indicator != NULL; | |
126 | } | |
127 | ||
1534c382 | 128 | /** |
1749a81d | 129 | * ap_intructions_available() - Test if AP instructions are available. |
1534c382 | 130 | * |
1749a81d | 131 | * Returns 0 if the AP instructions are installed. |
1534c382 MS |
132 | */ |
133 | static inline int ap_instructions_available(void) | |
134 | { | |
135 | register unsigned long reg0 asm ("0") = AP_MKQID(0,0); | |
136 | register unsigned long reg1 asm ("1") = -ENODEV; | |
137 | register unsigned long reg2 asm ("2") = 0UL; | |
138 | ||
139 | asm volatile( | |
140 | " .long 0xb2af0000\n" /* PQAP(TAPQ) */ | |
141 | "0: la %1,0\n" | |
142 | "1:\n" | |
143 | EX_TABLE(0b, 1b) | |
144 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" ); | |
145 | return reg1; | |
146 | } | |
147 | ||
cb17a636 FB |
148 | /** |
149 | * ap_interrupts_available(): Test if AP interrupts are available. | |
150 | * | |
151 | * Returns 1 if AP interrupts are available. | |
152 | */ | |
153 | static int ap_interrupts_available(void) | |
154 | { | |
155 | unsigned long long facility_bits[2]; | |
156 | ||
157 | if (stfle(facility_bits, 2) <= 1) | |
158 | return 0; | |
159 | if (!(facility_bits[0] & (1ULL << 61)) || | |
160 | !(facility_bits[1] & (1ULL << 62))) | |
161 | return 0; | |
162 | return 1; | |
163 | } | |
164 | ||
1534c382 | 165 | /** |
1749a81d FB |
166 | * ap_test_queue(): Test adjunct processor queue. |
167 | * @qid: The AP queue number | |
168 | * @queue_depth: Pointer to queue depth value | |
169 | * @device_type: Pointer to device type value | |
1534c382 | 170 | * |
1749a81d | 171 | * Returns AP queue status structure. |
1534c382 MS |
172 | */ |
173 | static inline struct ap_queue_status | |
174 | ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
175 | { | |
176 | register unsigned long reg0 asm ("0") = qid; | |
177 | register struct ap_queue_status reg1 asm ("1"); | |
178 | register unsigned long reg2 asm ("2") = 0UL; | |
179 | ||
180 | asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */ | |
181 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
182 | *device_type = (int) (reg2 >> 24); | |
183 | *queue_depth = (int) (reg2 & 0xff); | |
184 | return reg1; | |
185 | } | |
186 | ||
187 | /** | |
1749a81d FB |
188 | * ap_reset_queue(): Reset adjunct processor queue. |
189 | * @qid: The AP queue number | |
1534c382 | 190 | * |
1749a81d | 191 | * Returns AP queue status structure. |
1534c382 MS |
192 | */ |
193 | static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) | |
194 | { | |
195 | register unsigned long reg0 asm ("0") = qid | 0x01000000UL; | |
196 | register struct ap_queue_status reg1 asm ("1"); | |
197 | register unsigned long reg2 asm ("2") = 0UL; | |
198 | ||
199 | asm volatile( | |
200 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
201 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
202 | return reg1; | |
203 | } | |
204 | ||
cb17a636 FB |
205 | #ifdef CONFIG_64BIT |
206 | /** | |
207 | * ap_queue_interruption_control(): Enable interruption for a specific AP. | |
208 | * @qid: The AP queue number | |
209 | * @ind: The notification indicator byte | |
210 | * | |
211 | * Returns AP queue status. | |
212 | */ | |
213 | static inline struct ap_queue_status | |
214 | ap_queue_interruption_control(ap_qid_t qid, void *ind) | |
215 | { | |
216 | register unsigned long reg0 asm ("0") = qid | 0x03000000UL; | |
217 | register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC; | |
218 | register struct ap_queue_status reg1_out asm ("1"); | |
219 | register void *reg2 asm ("2") = ind; | |
220 | asm volatile( | |
221 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
222 | : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) | |
223 | : | |
224 | : "cc" ); | |
225 | return reg1_out; | |
226 | } | |
227 | #endif | |
228 | ||
229 | /** | |
230 | * ap_queue_enable_interruption(): Enable interruption on an AP. | |
231 | * @qid: The AP queue number | |
232 | * @ind: the notification indicator byte | |
233 | * | |
234 | * Enables interruption on AP queue via ap_queue_interruption_control(). Based | |
235 | * on the return value it waits a while and tests the AP queue if interrupts | |
236 | * have been switched on using ap_test_queue(). | |
237 | */ | |
238 | static int ap_queue_enable_interruption(ap_qid_t qid, void *ind) | |
239 | { | |
240 | #ifdef CONFIG_64BIT | |
241 | struct ap_queue_status status; | |
242 | int t_depth, t_device_type, rc, i; | |
243 | ||
244 | rc = -EBUSY; | |
245 | status = ap_queue_interruption_control(qid, ind); | |
246 | ||
247 | for (i = 0; i < AP_MAX_RESET; i++) { | |
248 | switch (status.response_code) { | |
249 | case AP_RESPONSE_NORMAL: | |
250 | if (status.int_enabled) | |
251 | return 0; | |
252 | break; | |
253 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
254 | case AP_RESPONSE_BUSY: | |
255 | break; | |
256 | case AP_RESPONSE_Q_NOT_AVAIL: | |
257 | case AP_RESPONSE_DECONFIGURED: | |
258 | case AP_RESPONSE_CHECKSTOPPED: | |
259 | case AP_RESPONSE_INVALID_ADDRESS: | |
260 | return -ENODEV; | |
261 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
262 | if (status.int_enabled) | |
263 | return 0; | |
264 | break; | |
265 | default: | |
266 | break; | |
267 | } | |
268 | if (i < AP_MAX_RESET - 1) { | |
269 | udelay(5); | |
270 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
271 | } | |
272 | } | |
273 | return rc; | |
274 | #else | |
275 | return -EINVAL; | |
276 | #endif | |
277 | } | |
278 | ||
1534c382 | 279 | /** |
1749a81d FB |
280 | * __ap_send(): Send message to adjunct processor queue. |
281 | * @qid: The AP queue number | |
282 | * @psmid: The program supplied message identifier | |
283 | * @msg: The message text | |
284 | * @length: The message length | |
1534c382 | 285 | * |
1749a81d | 286 | * Returns AP queue status structure. |
1534c382 | 287 | * Condition code 1 on NQAP can't happen because the L bit is 1. |
1534c382 MS |
288 | * Condition code 2 on NQAP also means the send is incomplete, |
289 | * because a segment boundary was reached. The NQAP is repeated. | |
290 | */ | |
291 | static inline struct ap_queue_status | |
292 | __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
293 | { | |
294 | typedef struct { char _[length]; } msgblock; | |
295 | register unsigned long reg0 asm ("0") = qid | 0x40000000UL; | |
296 | register struct ap_queue_status reg1 asm ("1"); | |
297 | register unsigned long reg2 asm ("2") = (unsigned long) msg; | |
298 | register unsigned long reg3 asm ("3") = (unsigned long) length; | |
299 | register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32); | |
300 | register unsigned long reg5 asm ("5") = (unsigned int) psmid; | |
301 | ||
302 | asm volatile ( | |
303 | "0: .long 0xb2ad0042\n" /* DQAP */ | |
304 | " brc 2,0b" | |
305 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) | |
306 | : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) | |
307 | : "cc" ); | |
308 | return reg1; | |
309 | } | |
310 | ||
311 | int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
312 | { | |
313 | struct ap_queue_status status; | |
314 | ||
315 | status = __ap_send(qid, psmid, msg, length); | |
316 | switch (status.response_code) { | |
317 | case AP_RESPONSE_NORMAL: | |
318 | return 0; | |
319 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 320 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
321 | return -EBUSY; |
322 | default: /* Device is gone. */ | |
323 | return -ENODEV; | |
324 | } | |
325 | } | |
326 | EXPORT_SYMBOL(ap_send); | |
327 | ||
1749a81d FB |
328 | /** |
329 | * __ap_recv(): Receive message from adjunct processor queue. | |
330 | * @qid: The AP queue number | |
331 | * @psmid: Pointer to program supplied message identifier | |
332 | * @msg: The message text | |
333 | * @length: The message length | |
1534c382 | 334 | * |
1749a81d | 335 | * Returns AP queue status structure. |
1534c382 MS |
336 | * Condition code 1 on DQAP means the receive has taken place |
337 | * but only partially. The response is incomplete, hence the | |
338 | * DQAP is repeated. | |
1534c382 MS |
339 | * Condition code 2 on DQAP also means the receive is incomplete, |
340 | * this time because a segment boundary was reached. Again, the | |
341 | * DQAP is repeated. | |
1534c382 MS |
342 | * Note that gpr2 is used by the DQAP instruction to keep track of |
343 | * any 'residual' length, in case the instruction gets interrupted. | |
344 | * Hence it gets zeroed before the instruction. | |
345 | */ | |
346 | static inline struct ap_queue_status | |
347 | __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
348 | { | |
349 | typedef struct { char _[length]; } msgblock; | |
350 | register unsigned long reg0 asm("0") = qid | 0x80000000UL; | |
351 | register struct ap_queue_status reg1 asm ("1"); | |
352 | register unsigned long reg2 asm("2") = 0UL; | |
353 | register unsigned long reg4 asm("4") = (unsigned long) msg; | |
354 | register unsigned long reg5 asm("5") = (unsigned long) length; | |
355 | register unsigned long reg6 asm("6") = 0UL; | |
356 | register unsigned long reg7 asm("7") = 0UL; | |
357 | ||
358 | ||
359 | asm volatile( | |
360 | "0: .long 0xb2ae0064\n" | |
361 | " brc 6,0b\n" | |
362 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), | |
363 | "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), | |
364 | "=m" (*(msgblock *) msg) : : "cc" ); | |
365 | *psmid = (((unsigned long long) reg6) << 32) + reg7; | |
366 | return reg1; | |
367 | } | |
368 | ||
369 | int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
370 | { | |
371 | struct ap_queue_status status; | |
372 | ||
373 | status = __ap_recv(qid, psmid, msg, length); | |
374 | switch (status.response_code) { | |
375 | case AP_RESPONSE_NORMAL: | |
376 | return 0; | |
377 | case AP_RESPONSE_NO_PENDING_REPLY: | |
378 | if (status.queue_empty) | |
379 | return -ENOENT; | |
380 | return -EBUSY; | |
af512ed0 RW |
381 | case AP_RESPONSE_RESET_IN_PROGRESS: |
382 | return -EBUSY; | |
1534c382 MS |
383 | default: |
384 | return -ENODEV; | |
385 | } | |
386 | } | |
387 | EXPORT_SYMBOL(ap_recv); | |
388 | ||
389 | /** | |
1749a81d FB |
390 | * ap_query_queue(): Check if an AP queue is available. |
391 | * @qid: The AP queue number | |
392 | * @queue_depth: Pointer to queue depth value | |
393 | * @device_type: Pointer to device type value | |
394 | * | |
395 | * The test is repeated for AP_MAX_RESET times. | |
1534c382 MS |
396 | */ |
397 | static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
398 | { | |
399 | struct ap_queue_status status; | |
400 | int t_depth, t_device_type, rc, i; | |
401 | ||
402 | rc = -EBUSY; | |
403 | for (i = 0; i < AP_MAX_RESET; i++) { | |
404 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
405 | switch (status.response_code) { | |
406 | case AP_RESPONSE_NORMAL: | |
407 | *queue_depth = t_depth + 1; | |
408 | *device_type = t_device_type; | |
409 | rc = 0; | |
410 | break; | |
411 | case AP_RESPONSE_Q_NOT_AVAIL: | |
412 | rc = -ENODEV; | |
413 | break; | |
414 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
415 | break; | |
416 | case AP_RESPONSE_DECONFIGURED: | |
417 | rc = -ENODEV; | |
418 | break; | |
419 | case AP_RESPONSE_CHECKSTOPPED: | |
420 | rc = -ENODEV; | |
421 | break; | |
cb17a636 FB |
422 | case AP_RESPONSE_INVALID_ADDRESS: |
423 | rc = -ENODEV; | |
424 | break; | |
425 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
426 | break; | |
1534c382 MS |
427 | case AP_RESPONSE_BUSY: |
428 | break; | |
429 | default: | |
430 | BUG(); | |
431 | } | |
432 | if (rc != -EBUSY) | |
433 | break; | |
434 | if (i < AP_MAX_RESET - 1) | |
435 | udelay(5); | |
436 | } | |
437 | return rc; | |
438 | } | |
439 | ||
440 | /** | |
1749a81d FB |
441 | * ap_init_queue(): Reset an AP queue. |
442 | * @qid: The AP queue number | |
443 | * | |
1534c382 | 444 | * Reset an AP queue and wait for it to become available again. |
1534c382 MS |
445 | */ |
446 | static int ap_init_queue(ap_qid_t qid) | |
447 | { | |
448 | struct ap_queue_status status; | |
449 | int rc, dummy, i; | |
450 | ||
451 | rc = -ENODEV; | |
452 | status = ap_reset_queue(qid); | |
453 | for (i = 0; i < AP_MAX_RESET; i++) { | |
454 | switch (status.response_code) { | |
455 | case AP_RESPONSE_NORMAL: | |
456 | if (status.queue_empty) | |
457 | rc = 0; | |
458 | break; | |
459 | case AP_RESPONSE_Q_NOT_AVAIL: | |
460 | case AP_RESPONSE_DECONFIGURED: | |
461 | case AP_RESPONSE_CHECKSTOPPED: | |
462 | i = AP_MAX_RESET; /* return with -ENODEV */ | |
463 | break; | |
464 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
af512ed0 | 465 | rc = -EBUSY; |
1534c382 MS |
466 | case AP_RESPONSE_BUSY: |
467 | default: | |
468 | break; | |
469 | } | |
af512ed0 | 470 | if (rc != -ENODEV && rc != -EBUSY) |
1534c382 MS |
471 | break; |
472 | if (i < AP_MAX_RESET - 1) { | |
473 | udelay(5); | |
474 | status = ap_test_queue(qid, &dummy, &dummy); | |
475 | } | |
476 | } | |
cb17a636 FB |
477 | if (rc == 0 && ap_using_interrupts()) { |
478 | rc = ap_queue_enable_interruption(qid, ap_interrupt_indicator); | |
479 | /* If interruption mode is supported by the machine, | |
480 | * but an AP can not be enabled for interruption then | |
481 | * the AP will be discarded. */ | |
482 | if (rc) | |
483 | pr_err("Registering adapter interrupts for " | |
484 | "AP %d failed\n", AP_QID_DEVICE(qid)); | |
485 | } | |
1534c382 MS |
486 | return rc; |
487 | } | |
488 | ||
af512ed0 | 489 | /** |
1749a81d FB |
490 | * ap_increase_queue_count(): Arm request timeout. |
491 | * @ap_dev: Pointer to an AP device. | |
492 | * | |
493 | * Arm request timeout if an AP device was idle and a new request is submitted. | |
af512ed0 RW |
494 | */ |
495 | static void ap_increase_queue_count(struct ap_device *ap_dev) | |
496 | { | |
497 | int timeout = ap_dev->drv->request_timeout; | |
498 | ||
499 | ap_dev->queue_count++; | |
500 | if (ap_dev->queue_count == 1) { | |
501 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
502 | ap_dev->reset = AP_RESET_ARMED; | |
503 | } | |
504 | } | |
505 | ||
506 | /** | |
1749a81d FB |
507 | * ap_decrease_queue_count(): Decrease queue count. |
508 | * @ap_dev: Pointer to an AP device. | |
509 | * | |
510 | * If AP device is still alive, re-schedule request timeout if there are still | |
af512ed0 RW |
511 | * pending requests. |
512 | */ | |
513 | static void ap_decrease_queue_count(struct ap_device *ap_dev) | |
514 | { | |
515 | int timeout = ap_dev->drv->request_timeout; | |
516 | ||
517 | ap_dev->queue_count--; | |
518 | if (ap_dev->queue_count > 0) | |
519 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
520 | else | |
1749a81d | 521 | /* |
af512ed0 RW |
522 | * The timeout timer should to be disabled now - since |
523 | * del_timer_sync() is very expensive, we just tell via the | |
524 | * reset flag to ignore the pending timeout timer. | |
525 | */ | |
526 | ap_dev->reset = AP_RESET_IGNORE; | |
527 | } | |
528 | ||
1749a81d | 529 | /* |
1534c382 MS |
530 | * AP device related attributes. |
531 | */ | |
532 | static ssize_t ap_hwtype_show(struct device *dev, | |
533 | struct device_attribute *attr, char *buf) | |
534 | { | |
535 | struct ap_device *ap_dev = to_ap_dev(dev); | |
536 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); | |
537 | } | |
1534c382 | 538 | |
43c207e6 | 539 | static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); |
1534c382 MS |
540 | static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr, |
541 | char *buf) | |
542 | { | |
543 | struct ap_device *ap_dev = to_ap_dev(dev); | |
544 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth); | |
545 | } | |
1534c382 | 546 | |
43c207e6 | 547 | static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); |
1534c382 MS |
548 | static ssize_t ap_request_count_show(struct device *dev, |
549 | struct device_attribute *attr, | |
550 | char *buf) | |
551 | { | |
552 | struct ap_device *ap_dev = to_ap_dev(dev); | |
553 | int rc; | |
554 | ||
555 | spin_lock_bh(&ap_dev->lock); | |
556 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count); | |
557 | spin_unlock_bh(&ap_dev->lock); | |
558 | return rc; | |
559 | } | |
560 | ||
561 | static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); | |
562 | ||
563 | static ssize_t ap_modalias_show(struct device *dev, | |
564 | struct device_attribute *attr, char *buf) | |
565 | { | |
566 | return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type); | |
567 | } | |
568 | ||
569 | static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); | |
570 | ||
571 | static struct attribute *ap_dev_attrs[] = { | |
572 | &dev_attr_hwtype.attr, | |
573 | &dev_attr_depth.attr, | |
574 | &dev_attr_request_count.attr, | |
575 | &dev_attr_modalias.attr, | |
576 | NULL | |
577 | }; | |
578 | static struct attribute_group ap_dev_attr_group = { | |
579 | .attrs = ap_dev_attrs | |
580 | }; | |
581 | ||
582 | /** | |
1749a81d FB |
583 | * ap_bus_match() |
584 | * @dev: Pointer to device | |
585 | * @drv: Pointer to device_driver | |
586 | * | |
1534c382 MS |
587 | * AP bus driver registration/unregistration. |
588 | */ | |
589 | static int ap_bus_match(struct device *dev, struct device_driver *drv) | |
590 | { | |
591 | struct ap_device *ap_dev = to_ap_dev(dev); | |
592 | struct ap_driver *ap_drv = to_ap_drv(drv); | |
593 | struct ap_device_id *id; | |
594 | ||
1749a81d | 595 | /* |
1534c382 MS |
596 | * Compare device type of the device with the list of |
597 | * supported types of the device_driver. | |
598 | */ | |
599 | for (id = ap_drv->ids; id->match_flags; id++) { | |
600 | if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) && | |
601 | (id->dev_type != ap_dev->device_type)) | |
602 | continue; | |
603 | return 1; | |
604 | } | |
605 | return 0; | |
606 | } | |
607 | ||
608 | /** | |
1749a81d FB |
609 | * ap_uevent(): Uevent function for AP devices. |
610 | * @dev: Pointer to device | |
611 | * @env: Pointer to kobj_uevent_env | |
612 | * | |
613 | * It sets up a single environment variable DEV_TYPE which contains the | |
614 | * hardware device type. | |
1534c382 | 615 | */ |
7eff2e7a | 616 | static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) |
1534c382 MS |
617 | { |
618 | struct ap_device *ap_dev = to_ap_dev(dev); | |
7eff2e7a | 619 | int retval = 0; |
1534c382 MS |
620 | |
621 | if (!ap_dev) | |
622 | return -ENODEV; | |
623 | ||
624 | /* Set up DEV_TYPE environment variable. */ | |
7eff2e7a | 625 | retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); |
bf62456e ER |
626 | if (retval) |
627 | return retval; | |
628 | ||
66a4263b | 629 | /* Add MODALIAS= */ |
7eff2e7a | 630 | retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); |
bf62456e | 631 | |
bf62456e | 632 | return retval; |
1534c382 MS |
633 | } |
634 | ||
772f5472 FB |
635 | static int ap_bus_suspend(struct device *dev, pm_message_t state) |
636 | { | |
637 | struct ap_device *ap_dev = to_ap_dev(dev); | |
638 | unsigned long flags; | |
639 | ||
640 | if (!ap_suspend_flag) { | |
641 | ap_suspend_flag = 1; | |
642 | ||
643 | /* Disable scanning for devices, thus we do not want to scan | |
644 | * for them after removing. | |
645 | */ | |
646 | del_timer_sync(&ap_config_timer); | |
647 | if (ap_work_queue != NULL) { | |
648 | destroy_workqueue(ap_work_queue); | |
649 | ap_work_queue = NULL; | |
650 | } | |
5314af69 | 651 | |
772f5472 FB |
652 | tasklet_disable(&ap_tasklet); |
653 | } | |
654 | /* Poll on the device until all requests are finished. */ | |
655 | do { | |
656 | flags = 0; | |
95f1556c | 657 | spin_lock_bh(&ap_dev->lock); |
772f5472 | 658 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 659 | spin_unlock_bh(&ap_dev->lock); |
772f5472 FB |
660 | } while ((flags & 1) || (flags & 2)); |
661 | ||
5314af69 FB |
662 | spin_lock_bh(&ap_dev->lock); |
663 | ap_dev->unregistered = 1; | |
664 | spin_unlock_bh(&ap_dev->lock); | |
665 | ||
772f5472 FB |
666 | return 0; |
667 | } | |
668 | ||
669 | static int ap_bus_resume(struct device *dev) | |
670 | { | |
671 | int rc = 0; | |
672 | struct ap_device *ap_dev = to_ap_dev(dev); | |
673 | ||
674 | if (ap_suspend_flag) { | |
675 | ap_suspend_flag = 0; | |
676 | if (!ap_interrupts_available()) | |
677 | ap_interrupt_indicator = NULL; | |
5314af69 FB |
678 | if (!user_set_domain) { |
679 | ap_domain_index = -1; | |
680 | ap_select_domain(); | |
681 | } | |
772f5472 FB |
682 | init_timer(&ap_config_timer); |
683 | ap_config_timer.function = ap_config_timeout; | |
684 | ap_config_timer.data = 0; | |
685 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
686 | add_timer(&ap_config_timer); | |
687 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
688 | if (!ap_work_queue) | |
689 | return -ENOMEM; | |
690 | tasklet_enable(&ap_tasklet); | |
691 | if (!ap_using_interrupts()) | |
692 | ap_schedule_poll_timer(); | |
693 | else | |
694 | tasklet_schedule(&ap_tasklet); | |
695 | if (ap_thread_flag) | |
696 | rc = ap_poll_thread_start(); | |
772f5472 | 697 | } |
5314af69 FB |
698 | if (AP_QID_QUEUE(ap_dev->qid) != ap_domain_index) { |
699 | spin_lock_bh(&ap_dev->lock); | |
700 | ap_dev->qid = AP_MKQID(AP_QID_DEVICE(ap_dev->qid), | |
701 | ap_domain_index); | |
702 | spin_unlock_bh(&ap_dev->lock); | |
703 | } | |
704 | queue_work(ap_work_queue, &ap_config_work); | |
772f5472 FB |
705 | |
706 | return rc; | |
707 | } | |
708 | ||
1534c382 MS |
709 | static struct bus_type ap_bus_type = { |
710 | .name = "ap", | |
711 | .match = &ap_bus_match, | |
712 | .uevent = &ap_uevent, | |
772f5472 FB |
713 | .suspend = ap_bus_suspend, |
714 | .resume = ap_bus_resume | |
1534c382 MS |
715 | }; |
716 | ||
717 | static int ap_device_probe(struct device *dev) | |
718 | { | |
719 | struct ap_device *ap_dev = to_ap_dev(dev); | |
720 | struct ap_driver *ap_drv = to_ap_drv(dev->driver); | |
721 | int rc; | |
722 | ||
723 | ap_dev->drv = ap_drv; | |
724 | rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; | |
faa582ca | 725 | if (!rc) { |
43c207e6 | 726 | spin_lock_bh(&ap_device_list_lock); |
faa582ca | 727 | list_add(&ap_dev->list, &ap_device_list); |
43c207e6 | 728 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca | 729 | } |
1534c382 MS |
730 | return rc; |
731 | } | |
732 | ||
733 | /** | |
1749a81d FB |
734 | * __ap_flush_queue(): Flush requests. |
735 | * @ap_dev: Pointer to the AP device | |
736 | * | |
1534c382 | 737 | * Flush all requests from the request/pending queue of an AP device. |
1534c382 | 738 | */ |
4d284cac | 739 | static void __ap_flush_queue(struct ap_device *ap_dev) |
1534c382 MS |
740 | { |
741 | struct ap_message *ap_msg, *next; | |
742 | ||
743 | list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) { | |
744 | list_del_init(&ap_msg->list); | |
745 | ap_dev->pendingq_count--; | |
746 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
747 | } | |
748 | list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) { | |
749 | list_del_init(&ap_msg->list); | |
750 | ap_dev->requestq_count--; | |
751 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
752 | } | |
753 | } | |
754 | ||
755 | void ap_flush_queue(struct ap_device *ap_dev) | |
756 | { | |
757 | spin_lock_bh(&ap_dev->lock); | |
758 | __ap_flush_queue(ap_dev); | |
759 | spin_unlock_bh(&ap_dev->lock); | |
760 | } | |
761 | EXPORT_SYMBOL(ap_flush_queue); | |
762 | ||
763 | static int ap_device_remove(struct device *dev) | |
764 | { | |
765 | struct ap_device *ap_dev = to_ap_dev(dev); | |
766 | struct ap_driver *ap_drv = ap_dev->drv; | |
767 | ||
4e56296d | 768 | ap_flush_queue(ap_dev); |
af512ed0 | 769 | del_timer_sync(&ap_dev->timeout); |
43c207e6 | 770 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 771 | list_del_init(&ap_dev->list); |
43c207e6 | 772 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca RW |
773 | if (ap_drv->remove) |
774 | ap_drv->remove(ap_dev); | |
e675c0d2 RW |
775 | spin_lock_bh(&ap_dev->lock); |
776 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
777 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
778 | return 0; |
779 | } | |
780 | ||
781 | int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, | |
782 | char *name) | |
783 | { | |
784 | struct device_driver *drv = &ap_drv->driver; | |
785 | ||
786 | drv->bus = &ap_bus_type; | |
787 | drv->probe = ap_device_probe; | |
788 | drv->remove = ap_device_remove; | |
789 | drv->owner = owner; | |
790 | drv->name = name; | |
791 | return driver_register(drv); | |
792 | } | |
793 | EXPORT_SYMBOL(ap_driver_register); | |
794 | ||
795 | void ap_driver_unregister(struct ap_driver *ap_drv) | |
796 | { | |
797 | driver_unregister(&ap_drv->driver); | |
798 | } | |
799 | EXPORT_SYMBOL(ap_driver_unregister); | |
800 | ||
1749a81d | 801 | /* |
1534c382 MS |
802 | * AP bus attributes. |
803 | */ | |
804 | static ssize_t ap_domain_show(struct bus_type *bus, char *buf) | |
805 | { | |
806 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); | |
807 | } | |
808 | ||
809 | static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL); | |
810 | ||
811 | static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) | |
812 | { | |
813 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); | |
814 | } | |
815 | ||
cb17a636 FB |
816 | static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) |
817 | { | |
818 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
819 | ap_using_interrupts() ? 1 : 0); | |
820 | } | |
821 | ||
822 | static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); | |
823 | ||
1534c382 MS |
824 | static ssize_t ap_config_time_store(struct bus_type *bus, |
825 | const char *buf, size_t count) | |
826 | { | |
827 | int time; | |
828 | ||
829 | if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) | |
830 | return -EINVAL; | |
831 | ap_config_time = time; | |
832 | if (!timer_pending(&ap_config_timer) || | |
833 | !mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) { | |
834 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
835 | add_timer(&ap_config_timer); | |
836 | } | |
837 | return count; | |
838 | } | |
839 | ||
840 | static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); | |
841 | ||
842 | static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) | |
843 | { | |
844 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); | |
845 | } | |
846 | ||
847 | static ssize_t ap_poll_thread_store(struct bus_type *bus, | |
848 | const char *buf, size_t count) | |
849 | { | |
850 | int flag, rc; | |
851 | ||
852 | if (sscanf(buf, "%d\n", &flag) != 1) | |
853 | return -EINVAL; | |
854 | if (flag) { | |
855 | rc = ap_poll_thread_start(); | |
856 | if (rc) | |
857 | return rc; | |
858 | } | |
859 | else | |
860 | ap_poll_thread_stop(); | |
861 | return count; | |
862 | } | |
863 | ||
864 | static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); | |
865 | ||
fe137230 FB |
866 | static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) |
867 | { | |
868 | return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); | |
869 | } | |
870 | ||
871 | static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, | |
872 | size_t count) | |
873 | { | |
874 | unsigned long long time; | |
875 | ktime_t hr_time; | |
876 | ||
877 | /* 120 seconds = maximum poll interval */ | |
cb17a636 FB |
878 | if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || |
879 | time > 120000000000ULL) | |
fe137230 FB |
880 | return -EINVAL; |
881 | poll_timeout = time; | |
882 | hr_time = ktime_set(0, poll_timeout); | |
883 | ||
884 | if (!hrtimer_is_queued(&ap_poll_timer) || | |
6c644eae AV |
885 | !hrtimer_forward(&ap_poll_timer, hrtimer_get_expires(&ap_poll_timer), hr_time)) { |
886 | hrtimer_set_expires(&ap_poll_timer, hr_time); | |
887 | hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); | |
fe137230 FB |
888 | } |
889 | return count; | |
890 | } | |
891 | ||
892 | static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); | |
893 | ||
1534c382 MS |
894 | static struct bus_attribute *const ap_bus_attrs[] = { |
895 | &bus_attr_ap_domain, | |
896 | &bus_attr_config_time, | |
897 | &bus_attr_poll_thread, | |
cb17a636 | 898 | &bus_attr_ap_interrupts, |
fe137230 FB |
899 | &bus_attr_poll_timeout, |
900 | NULL, | |
1534c382 MS |
901 | }; |
902 | ||
903 | /** | |
1749a81d FB |
904 | * ap_select_domain(): Select an AP domain. |
905 | * | |
906 | * Pick one of the 16 AP domains. | |
1534c382 | 907 | */ |
4d284cac | 908 | static int ap_select_domain(void) |
1534c382 MS |
909 | { |
910 | int queue_depth, device_type, count, max_count, best_domain; | |
911 | int rc, i, j; | |
912 | ||
1749a81d | 913 | /* |
1534c382 MS |
914 | * We want to use a single domain. Either the one specified with |
915 | * the "domain=" parameter or the domain with the maximum number | |
916 | * of devices. | |
917 | */ | |
918 | if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS) | |
919 | /* Domain has already been selected. */ | |
920 | return 0; | |
921 | best_domain = -1; | |
922 | max_count = 0; | |
923 | for (i = 0; i < AP_DOMAINS; i++) { | |
924 | count = 0; | |
925 | for (j = 0; j < AP_DEVICES; j++) { | |
926 | ap_qid_t qid = AP_MKQID(j, i); | |
927 | rc = ap_query_queue(qid, &queue_depth, &device_type); | |
928 | if (rc) | |
929 | continue; | |
930 | count++; | |
931 | } | |
932 | if (count > max_count) { | |
933 | max_count = count; | |
934 | best_domain = i; | |
935 | } | |
936 | } | |
937 | if (best_domain >= 0){ | |
938 | ap_domain_index = best_domain; | |
939 | return 0; | |
940 | } | |
941 | return -ENODEV; | |
942 | } | |
943 | ||
944 | /** | |
1749a81d | 945 | * ap_probe_device_type(): Find the device type of an AP. |
1534c382 | 946 | * @ap_dev: pointer to the AP device. |
1749a81d FB |
947 | * |
948 | * Find the device type if query queue returned a device type of 0. | |
1534c382 MS |
949 | */ |
950 | static int ap_probe_device_type(struct ap_device *ap_dev) | |
951 | { | |
952 | static unsigned char msg[] = { | |
953 | 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00, | |
954 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
955 | 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00, | |
956 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
957 | 0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50, | |
958 | 0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01, | |
959 | 0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00, | |
960 | 0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00, | |
961 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
962 | 0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00, | |
963 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
964 | 0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00, | |
965 | 0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00, | |
966 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
967 | 0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00, | |
968 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
969 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
970 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
971 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
972 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
973 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
974 | 0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00, | |
975 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
976 | 0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00, | |
977 | 0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20, | |
978 | 0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53, | |
979 | 0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22, | |
980 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
981 | 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88, | |
982 | 0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66, | |
983 | 0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44, | |
984 | 0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22, | |
985 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
986 | 0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77, | |
987 | 0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00, | |
988 | 0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00, | |
989 | 0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01, | |
990 | 0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c, | |
991 | 0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68, | |
992 | 0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66, | |
993 | 0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0, | |
994 | 0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8, | |
995 | 0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04, | |
996 | 0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57, | |
997 | 0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d, | |
998 | }; | |
999 | struct ap_queue_status status; | |
1000 | unsigned long long psmid; | |
1001 | char *reply; | |
1002 | int rc, i; | |
1003 | ||
1004 | reply = (void *) get_zeroed_page(GFP_KERNEL); | |
1005 | if (!reply) { | |
1006 | rc = -ENOMEM; | |
1007 | goto out; | |
1008 | } | |
1009 | ||
1010 | status = __ap_send(ap_dev->qid, 0x0102030405060708ULL, | |
1011 | msg, sizeof(msg)); | |
1012 | if (status.response_code != AP_RESPONSE_NORMAL) { | |
1013 | rc = -ENODEV; | |
1014 | goto out_free; | |
1015 | } | |
1016 | ||
1017 | /* Wait for the test message to complete. */ | |
1018 | for (i = 0; i < 6; i++) { | |
1019 | mdelay(300); | |
1020 | status = __ap_recv(ap_dev->qid, &psmid, reply, 4096); | |
1021 | if (status.response_code == AP_RESPONSE_NORMAL && | |
1022 | psmid == 0x0102030405060708ULL) | |
1023 | break; | |
1024 | } | |
1025 | if (i < 6) { | |
1026 | /* Got an answer. */ | |
1027 | if (reply[0] == 0x00 && reply[1] == 0x86) | |
1028 | ap_dev->device_type = AP_DEVICE_TYPE_PCICC; | |
1029 | else | |
1030 | ap_dev->device_type = AP_DEVICE_TYPE_PCICA; | |
1031 | rc = 0; | |
1032 | } else | |
1033 | rc = -ENODEV; | |
1034 | ||
1035 | out_free: | |
1036 | free_page((unsigned long) reply); | |
1037 | out: | |
1038 | return rc; | |
1039 | } | |
1040 | ||
cb17a636 FB |
1041 | static void ap_interrupt_handler(void *unused1, void *unused2) |
1042 | { | |
1043 | tasklet_schedule(&ap_tasklet); | |
1044 | } | |
1045 | ||
1534c382 | 1046 | /** |
1749a81d FB |
1047 | * __ap_scan_bus(): Scan the AP bus. |
1048 | * @dev: Pointer to device | |
1049 | * @data: Pointer to data | |
1050 | * | |
1051 | * Scan the AP bus for new devices. | |
1534c382 MS |
1052 | */ |
1053 | static int __ap_scan_bus(struct device *dev, void *data) | |
1054 | { | |
1055 | return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data; | |
1056 | } | |
1057 | ||
1058 | static void ap_device_release(struct device *dev) | |
1059 | { | |
1060 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1061 | ||
1062 | kfree(ap_dev); | |
1063 | } | |
1064 | ||
4927b3f7 | 1065 | static void ap_scan_bus(struct work_struct *unused) |
1534c382 MS |
1066 | { |
1067 | struct ap_device *ap_dev; | |
1068 | struct device *dev; | |
1069 | ap_qid_t qid; | |
1070 | int queue_depth, device_type; | |
1071 | int rc, i; | |
1072 | ||
1073 | if (ap_select_domain() != 0) | |
1074 | return; | |
1075 | for (i = 0; i < AP_DEVICES; i++) { | |
1076 | qid = AP_MKQID(i, ap_domain_index); | |
1077 | dev = bus_find_device(&ap_bus_type, NULL, | |
1078 | (void *)(unsigned long)qid, | |
1079 | __ap_scan_bus); | |
f3b017d8 | 1080 | rc = ap_query_queue(qid, &queue_depth, &device_type); |
c6a48264 | 1081 | if (dev) { |
af512ed0 RW |
1082 | if (rc == -EBUSY) { |
1083 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1084 | schedule_timeout(AP_RESET_TIMEOUT); | |
1085 | rc = ap_query_queue(qid, &queue_depth, | |
1086 | &device_type); | |
1087 | } | |
c6a48264 RW |
1088 | ap_dev = to_ap_dev(dev); |
1089 | spin_lock_bh(&ap_dev->lock); | |
1090 | if (rc || ap_dev->unregistered) { | |
1091 | spin_unlock_bh(&ap_dev->lock); | |
5314af69 FB |
1092 | if (ap_dev->unregistered) |
1093 | i--; | |
c6a48264 | 1094 | device_unregister(dev); |
af512ed0 | 1095 | put_device(dev); |
c6a48264 | 1096 | continue; |
af512ed0 RW |
1097 | } |
1098 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
1099 | put_device(dev); |
1100 | continue; | |
1101 | } | |
1534c382 MS |
1102 | if (rc) |
1103 | continue; | |
1104 | rc = ap_init_queue(qid); | |
1105 | if (rc) | |
1106 | continue; | |
1107 | ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL); | |
1108 | if (!ap_dev) | |
1109 | break; | |
1110 | ap_dev->qid = qid; | |
1111 | ap_dev->queue_depth = queue_depth; | |
4e56296d | 1112 | ap_dev->unregistered = 1; |
1534c382 MS |
1113 | spin_lock_init(&ap_dev->lock); |
1114 | INIT_LIST_HEAD(&ap_dev->pendingq); | |
1115 | INIT_LIST_HEAD(&ap_dev->requestq); | |
cf352ce0 | 1116 | INIT_LIST_HEAD(&ap_dev->list); |
af512ed0 RW |
1117 | setup_timer(&ap_dev->timeout, ap_request_timeout, |
1118 | (unsigned long) ap_dev); | |
1534c382 MS |
1119 | if (device_type == 0) |
1120 | ap_probe_device_type(ap_dev); | |
1121 | else | |
1122 | ap_dev->device_type = device_type; | |
1123 | ||
1124 | ap_dev->device.bus = &ap_bus_type; | |
1125 | ap_dev->device.parent = ap_root_device; | |
edc44fa0 FB |
1126 | if (dev_set_name(&ap_dev->device, "card%02x", |
1127 | AP_QID_DEVICE(ap_dev->qid))) { | |
1128 | kfree(ap_dev); | |
1129 | continue; | |
1130 | } | |
1534c382 MS |
1131 | ap_dev->device.release = ap_device_release; |
1132 | rc = device_register(&ap_dev->device); | |
1133 | if (rc) { | |
c6304933 | 1134 | put_device(&ap_dev->device); |
1534c382 MS |
1135 | continue; |
1136 | } | |
1137 | /* Add device attributes. */ | |
1138 | rc = sysfs_create_group(&ap_dev->device.kobj, | |
1139 | &ap_dev_attr_group); | |
4e56296d RW |
1140 | if (!rc) { |
1141 | spin_lock_bh(&ap_dev->lock); | |
1142 | ap_dev->unregistered = 0; | |
1143 | spin_unlock_bh(&ap_dev->lock); | |
1144 | } | |
1145 | else | |
1534c382 MS |
1146 | device_unregister(&ap_dev->device); |
1147 | } | |
1148 | } | |
1149 | ||
1150 | static void | |
1151 | ap_config_timeout(unsigned long ptr) | |
1152 | { | |
1153 | queue_work(ap_work_queue, &ap_config_work); | |
1154 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1155 | add_timer(&ap_config_timer); | |
1156 | } | |
1157 | ||
1158 | /** | |
1749a81d FB |
1159 | * ap_schedule_poll_timer(): Schedule poll timer. |
1160 | * | |
1534c382 MS |
1161 | * Set up the timer to run the poll tasklet |
1162 | */ | |
1163 | static inline void ap_schedule_poll_timer(void) | |
1164 | { | |
8d406c6d | 1165 | ktime_t hr_time; |
772f5472 | 1166 | if (ap_using_interrupts() || ap_suspend_flag) |
cb17a636 | 1167 | return; |
fe137230 | 1168 | if (hrtimer_is_queued(&ap_poll_timer)) |
1534c382 | 1169 | return; |
8d406c6d FB |
1170 | if (ktime_to_ns(hrtimer_expires_remaining(&ap_poll_timer)) <= 0) { |
1171 | hr_time = ktime_set(0, poll_timeout); | |
1172 | hrtimer_forward_now(&ap_poll_timer, hr_time); | |
1173 | hrtimer_restart(&ap_poll_timer); | |
1174 | } | |
1175 | return; | |
1534c382 MS |
1176 | } |
1177 | ||
1178 | /** | |
1749a81d | 1179 | * ap_poll_read(): Receive pending reply messages from an AP device. |
1534c382 MS |
1180 | * @ap_dev: pointer to the AP device |
1181 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1182 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1183 | * |
1534c382 MS |
1184 | * Returns 0 if the device is still present, -ENODEV if not. |
1185 | */ | |
4d284cac | 1186 | static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1187 | { |
1188 | struct ap_queue_status status; | |
1189 | struct ap_message *ap_msg; | |
1190 | ||
1191 | if (ap_dev->queue_count <= 0) | |
1192 | return 0; | |
1193 | status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid, | |
1194 | ap_dev->reply->message, ap_dev->reply->length); | |
1195 | switch (status.response_code) { | |
1196 | case AP_RESPONSE_NORMAL: | |
1197 | atomic_dec(&ap_poll_requests); | |
af512ed0 | 1198 | ap_decrease_queue_count(ap_dev); |
1534c382 MS |
1199 | list_for_each_entry(ap_msg, &ap_dev->pendingq, list) { |
1200 | if (ap_msg->psmid != ap_dev->reply->psmid) | |
1201 | continue; | |
1202 | list_del_init(&ap_msg->list); | |
1203 | ap_dev->pendingq_count--; | |
1204 | ap_dev->drv->receive(ap_dev, ap_msg, ap_dev->reply); | |
1205 | break; | |
1206 | } | |
1207 | if (ap_dev->queue_count > 0) | |
1208 | *flags |= 1; | |
1209 | break; | |
1210 | case AP_RESPONSE_NO_PENDING_REPLY: | |
1211 | if (status.queue_empty) { | |
1212 | /* The card shouldn't forget requests but who knows. */ | |
e675c0d2 | 1213 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); |
1534c382 MS |
1214 | ap_dev->queue_count = 0; |
1215 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1216 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1217 | ap_dev->pendingq_count = 0; | |
1218 | } else | |
1219 | *flags |= 2; | |
1220 | break; | |
1221 | default: | |
1222 | return -ENODEV; | |
1223 | } | |
1224 | return 0; | |
1225 | } | |
1226 | ||
1227 | /** | |
1749a81d | 1228 | * ap_poll_write(): Send messages from the request queue to an AP device. |
1534c382 MS |
1229 | * @ap_dev: pointer to the AP device |
1230 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1231 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1232 | * |
1534c382 MS |
1233 | * Returns 0 if the device is still present, -ENODEV if not. |
1234 | */ | |
4d284cac | 1235 | static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1236 | { |
1237 | struct ap_queue_status status; | |
1238 | struct ap_message *ap_msg; | |
1239 | ||
1240 | if (ap_dev->requestq_count <= 0 || | |
1241 | ap_dev->queue_count >= ap_dev->queue_depth) | |
1242 | return 0; | |
1243 | /* Start the next request on the queue. */ | |
1244 | ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list); | |
1245 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
1246 | ap_msg->message, ap_msg->length); | |
1247 | switch (status.response_code) { | |
1248 | case AP_RESPONSE_NORMAL: | |
1249 | atomic_inc(&ap_poll_requests); | |
af512ed0 | 1250 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1251 | list_move_tail(&ap_msg->list, &ap_dev->pendingq); |
1252 | ap_dev->requestq_count--; | |
1253 | ap_dev->pendingq_count++; | |
1254 | if (ap_dev->queue_count < ap_dev->queue_depth && | |
1255 | ap_dev->requestq_count > 0) | |
1256 | *flags |= 1; | |
1257 | *flags |= 2; | |
1258 | break; | |
1259 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1260 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1261 | *flags |= 2; |
1262 | break; | |
1263 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
1264 | return -EINVAL; | |
1265 | default: | |
1266 | return -ENODEV; | |
1267 | } | |
1268 | return 0; | |
1269 | } | |
1270 | ||
1271 | /** | |
1749a81d | 1272 | * ap_poll_queue(): Poll AP device for pending replies and send new messages. |
1534c382 MS |
1273 | * @ap_dev: pointer to the bus device |
1274 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1275 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d FB |
1276 | * |
1277 | * Poll AP device for pending replies and send new messages. If either | |
1278 | * ap_poll_read or ap_poll_write returns -ENODEV unregister the device. | |
1534c382 MS |
1279 | * Returns 0. |
1280 | */ | |
1281 | static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags) | |
1282 | { | |
1283 | int rc; | |
1284 | ||
1285 | rc = ap_poll_read(ap_dev, flags); | |
1286 | if (rc) | |
1287 | return rc; | |
1288 | return ap_poll_write(ap_dev, flags); | |
1289 | } | |
1290 | ||
1291 | /** | |
1749a81d | 1292 | * __ap_queue_message(): Queue a message to a device. |
1534c382 MS |
1293 | * @ap_dev: pointer to the AP device |
1294 | * @ap_msg: the message to be queued | |
1749a81d FB |
1295 | * |
1296 | * Queue a message to a device. Returns 0 if successful. | |
1534c382 MS |
1297 | */ |
1298 | static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1299 | { | |
1300 | struct ap_queue_status status; | |
1301 | ||
1302 | if (list_empty(&ap_dev->requestq) && | |
1303 | ap_dev->queue_count < ap_dev->queue_depth) { | |
1304 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
1305 | ap_msg->message, ap_msg->length); | |
1306 | switch (status.response_code) { | |
1307 | case AP_RESPONSE_NORMAL: | |
1308 | list_add_tail(&ap_msg->list, &ap_dev->pendingq); | |
1309 | atomic_inc(&ap_poll_requests); | |
1310 | ap_dev->pendingq_count++; | |
af512ed0 | 1311 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1312 | ap_dev->total_request_count++; |
1313 | break; | |
1314 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1315 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1316 | list_add_tail(&ap_msg->list, &ap_dev->requestq); |
1317 | ap_dev->requestq_count++; | |
1318 | ap_dev->total_request_count++; | |
1319 | return -EBUSY; | |
1320 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
1321 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL)); | |
1322 | return -EINVAL; | |
1323 | default: /* Device is gone. */ | |
1324 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
1325 | return -ENODEV; | |
1326 | } | |
1327 | } else { | |
1328 | list_add_tail(&ap_msg->list, &ap_dev->requestq); | |
1329 | ap_dev->requestq_count++; | |
1330 | ap_dev->total_request_count++; | |
1331 | return -EBUSY; | |
1332 | } | |
1333 | ap_schedule_poll_timer(); | |
1334 | return 0; | |
1335 | } | |
1336 | ||
1337 | void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1338 | { | |
1339 | unsigned long flags; | |
1340 | int rc; | |
1341 | ||
1342 | spin_lock_bh(&ap_dev->lock); | |
1343 | if (!ap_dev->unregistered) { | |
1344 | /* Make room on the queue by polling for finished requests. */ | |
1345 | rc = ap_poll_queue(ap_dev, &flags); | |
1346 | if (!rc) | |
1347 | rc = __ap_queue_message(ap_dev, ap_msg); | |
1348 | if (!rc) | |
1349 | wake_up(&ap_poll_wait); | |
4e56296d RW |
1350 | if (rc == -ENODEV) |
1351 | ap_dev->unregistered = 1; | |
1534c382 MS |
1352 | } else { |
1353 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
c6a48264 | 1354 | rc = -ENODEV; |
1534c382 MS |
1355 | } |
1356 | spin_unlock_bh(&ap_dev->lock); | |
1357 | if (rc == -ENODEV) | |
1358 | device_unregister(&ap_dev->device); | |
1359 | } | |
1360 | EXPORT_SYMBOL(ap_queue_message); | |
1361 | ||
1362 | /** | |
1749a81d FB |
1363 | * ap_cancel_message(): Cancel a crypto request. |
1364 | * @ap_dev: The AP device that has the message queued | |
1365 | * @ap_msg: The message that is to be removed | |
1366 | * | |
1534c382 | 1367 | * Cancel a crypto request. This is done by removing the request |
1749a81d | 1368 | * from the device pending or request queue. Note that the |
1534c382 MS |
1369 | * request stays on the AP queue. When it finishes the message |
1370 | * reply will be discarded because the psmid can't be found. | |
1534c382 MS |
1371 | */ |
1372 | void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1373 | { | |
1374 | struct ap_message *tmp; | |
1375 | ||
1376 | spin_lock_bh(&ap_dev->lock); | |
1377 | if (!list_empty(&ap_msg->list)) { | |
1378 | list_for_each_entry(tmp, &ap_dev->pendingq, list) | |
1379 | if (tmp->psmid == ap_msg->psmid) { | |
1380 | ap_dev->pendingq_count--; | |
1381 | goto found; | |
1382 | } | |
1383 | ap_dev->requestq_count--; | |
1384 | found: | |
1385 | list_del_init(&ap_msg->list); | |
1386 | } | |
1387 | spin_unlock_bh(&ap_dev->lock); | |
1388 | } | |
1389 | EXPORT_SYMBOL(ap_cancel_message); | |
1390 | ||
1391 | /** | |
1749a81d | 1392 | * ap_poll_timeout(): AP receive polling for finished AP requests. |
fe137230 | 1393 | * @unused: Unused pointer. |
1749a81d | 1394 | * |
fe137230 | 1395 | * Schedules the AP tasklet using a high resolution timer. |
1534c382 | 1396 | */ |
fe137230 | 1397 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) |
1534c382 MS |
1398 | { |
1399 | tasklet_schedule(&ap_tasklet); | |
fe137230 | 1400 | return HRTIMER_NORESTART; |
1534c382 MS |
1401 | } |
1402 | ||
af512ed0 | 1403 | /** |
1749a81d FB |
1404 | * ap_reset(): Reset a not responding AP device. |
1405 | * @ap_dev: Pointer to the AP device | |
1406 | * | |
af512ed0 RW |
1407 | * Reset a not responding AP device and move all requests from the |
1408 | * pending queue to the request queue. | |
1409 | */ | |
1410 | static void ap_reset(struct ap_device *ap_dev) | |
1411 | { | |
1412 | int rc; | |
1413 | ||
1414 | ap_dev->reset = AP_RESET_IGNORE; | |
1415 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
1416 | ap_dev->queue_count = 0; | |
1417 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1418 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1419 | ap_dev->pendingq_count = 0; | |
1420 | rc = ap_init_queue(ap_dev->qid); | |
1421 | if (rc == -ENODEV) | |
1422 | ap_dev->unregistered = 1; | |
1423 | } | |
1424 | ||
43c207e6 | 1425 | static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 | 1426 | { |
1534c382 | 1427 | if (!ap_dev->unregistered) { |
c6a48264 | 1428 | if (ap_poll_queue(ap_dev, flags)) |
4e56296d | 1429 | ap_dev->unregistered = 1; |
af512ed0 RW |
1430 | if (ap_dev->reset == AP_RESET_DO) |
1431 | ap_reset(ap_dev); | |
c6a48264 | 1432 | } |
1534c382 MS |
1433 | return 0; |
1434 | } | |
1435 | ||
1749a81d FB |
1436 | /** |
1437 | * ap_poll_all(): Poll all AP devices. | |
1438 | * @dummy: Unused variable | |
1439 | * | |
1440 | * Poll all AP devices on the bus in a round robin fashion. Continue | |
1441 | * polling until bit 2^0 of the control flags is not set. If bit 2^1 | |
1442 | * of the control flags has been set arm the poll timer. | |
1443 | */ | |
1534c382 MS |
1444 | static void ap_poll_all(unsigned long dummy) |
1445 | { | |
1446 | unsigned long flags; | |
cf352ce0 | 1447 | struct ap_device *ap_dev; |
1534c382 | 1448 | |
cb17a636 FB |
1449 | /* Reset the indicator if interrupts are used. Thus new interrupts can |
1450 | * be received. Doing it in the beginning of the tasklet is therefor | |
1451 | * important that no requests on any AP get lost. | |
1452 | */ | |
1453 | if (ap_using_interrupts()) | |
1454 | xchg((u8 *)ap_interrupt_indicator, 0); | |
1534c382 MS |
1455 | do { |
1456 | flags = 0; | |
43c207e6 | 1457 | spin_lock(&ap_device_list_lock); |
cf352ce0 | 1458 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
95f1556c | 1459 | spin_lock(&ap_dev->lock); |
43c207e6 | 1460 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 1461 | spin_unlock(&ap_dev->lock); |
cf352ce0 | 1462 | } |
43c207e6 | 1463 | spin_unlock(&ap_device_list_lock); |
1534c382 MS |
1464 | } while (flags & 1); |
1465 | if (flags & 2) | |
1466 | ap_schedule_poll_timer(); | |
1467 | } | |
1468 | ||
1469 | /** | |
1749a81d FB |
1470 | * ap_poll_thread(): Thread that polls for finished requests. |
1471 | * @data: Unused pointer | |
1472 | * | |
1534c382 MS |
1473 | * AP bus poll thread. The purpose of this thread is to poll for |
1474 | * finished requests in a loop if there is a "free" cpu - that is | |
1475 | * a cpu that doesn't have anything better to do. The polling stops | |
1476 | * as soon as there is another task or if all messages have been | |
1477 | * delivered. | |
1478 | */ | |
1479 | static int ap_poll_thread(void *data) | |
1480 | { | |
1481 | DECLARE_WAITQUEUE(wait, current); | |
1482 | unsigned long flags; | |
1483 | int requests; | |
cf352ce0 | 1484 | struct ap_device *ap_dev; |
1534c382 | 1485 | |
d83682b3 | 1486 | set_user_nice(current, 19); |
1534c382 | 1487 | while (1) { |
772f5472 FB |
1488 | if (ap_suspend_flag) |
1489 | return 0; | |
1534c382 MS |
1490 | if (need_resched()) { |
1491 | schedule(); | |
1492 | continue; | |
1493 | } | |
1494 | add_wait_queue(&ap_poll_wait, &wait); | |
1495 | set_current_state(TASK_INTERRUPTIBLE); | |
1496 | if (kthread_should_stop()) | |
1497 | break; | |
1498 | requests = atomic_read(&ap_poll_requests); | |
1499 | if (requests <= 0) | |
1500 | schedule(); | |
1501 | set_current_state(TASK_RUNNING); | |
1502 | remove_wait_queue(&ap_poll_wait, &wait); | |
1503 | ||
1534c382 | 1504 | flags = 0; |
43c207e6 | 1505 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 1506 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
95f1556c | 1507 | spin_lock(&ap_dev->lock); |
43c207e6 | 1508 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 1509 | spin_unlock(&ap_dev->lock); |
cf352ce0 | 1510 | } |
43c207e6 | 1511 | spin_unlock_bh(&ap_device_list_lock); |
1534c382 MS |
1512 | } |
1513 | set_current_state(TASK_RUNNING); | |
1514 | remove_wait_queue(&ap_poll_wait, &wait); | |
1515 | return 0; | |
1516 | } | |
1517 | ||
1518 | static int ap_poll_thread_start(void) | |
1519 | { | |
1520 | int rc; | |
1521 | ||
772f5472 | 1522 | if (ap_using_interrupts() || ap_suspend_flag) |
cb17a636 | 1523 | return 0; |
1534c382 MS |
1524 | mutex_lock(&ap_poll_thread_mutex); |
1525 | if (!ap_poll_kthread) { | |
1526 | ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); | |
1527 | rc = IS_ERR(ap_poll_kthread) ? PTR_ERR(ap_poll_kthread) : 0; | |
1528 | if (rc) | |
1529 | ap_poll_kthread = NULL; | |
1530 | } | |
1531 | else | |
1532 | rc = 0; | |
1533 | mutex_unlock(&ap_poll_thread_mutex); | |
1534 | return rc; | |
1535 | } | |
1536 | ||
1537 | static void ap_poll_thread_stop(void) | |
1538 | { | |
1539 | mutex_lock(&ap_poll_thread_mutex); | |
1540 | if (ap_poll_kthread) { | |
1541 | kthread_stop(ap_poll_kthread); | |
1542 | ap_poll_kthread = NULL; | |
1543 | } | |
1544 | mutex_unlock(&ap_poll_thread_mutex); | |
1545 | } | |
1546 | ||
af512ed0 | 1547 | /** |
1749a81d FB |
1548 | * ap_request_timeout(): Handling of request timeouts |
1549 | * @data: Holds the AP device. | |
1550 | * | |
1551 | * Handles request timeouts. | |
af512ed0 RW |
1552 | */ |
1553 | static void ap_request_timeout(unsigned long data) | |
1554 | { | |
1555 | struct ap_device *ap_dev = (struct ap_device *) data; | |
1556 | ||
cb17a636 | 1557 | if (ap_dev->reset == AP_RESET_ARMED) { |
af512ed0 | 1558 | ap_dev->reset = AP_RESET_DO; |
cb17a636 FB |
1559 | |
1560 | if (ap_using_interrupts()) | |
1561 | tasklet_schedule(&ap_tasklet); | |
1562 | } | |
af512ed0 RW |
1563 | } |
1564 | ||
13e742ba RW |
1565 | static void ap_reset_domain(void) |
1566 | { | |
1567 | int i; | |
1568 | ||
39aa7cf6 RW |
1569 | if (ap_domain_index != -1) |
1570 | for (i = 0; i < AP_DEVICES; i++) | |
1571 | ap_reset_queue(AP_MKQID(i, ap_domain_index)); | |
13e742ba RW |
1572 | } |
1573 | ||
1574 | static void ap_reset_all(void) | |
85eca850 RW |
1575 | { |
1576 | int i, j; | |
1577 | ||
1578 | for (i = 0; i < AP_DOMAINS; i++) | |
1579 | for (j = 0; j < AP_DEVICES; j++) | |
1580 | ap_reset_queue(AP_MKQID(j, i)); | |
1581 | } | |
1582 | ||
1583 | static struct reset_call ap_reset_call = { | |
13e742ba | 1584 | .fn = ap_reset_all, |
85eca850 RW |
1585 | }; |
1586 | ||
1534c382 | 1587 | /** |
1749a81d FB |
1588 | * ap_module_init(): The module initialization code. |
1589 | * | |
1590 | * Initializes the module. | |
1534c382 MS |
1591 | */ |
1592 | int __init ap_module_init(void) | |
1593 | { | |
1594 | int rc, i; | |
1595 | ||
1596 | if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) { | |
136f7a1c MS |
1597 | pr_warning("%d is not a valid cryptographic domain\n", |
1598 | ap_domain_index); | |
1534c382 MS |
1599 | return -EINVAL; |
1600 | } | |
5314af69 FB |
1601 | /* In resume callback we need to know if the user had set the domain. |
1602 | * If so, we can not just reset it. | |
1603 | */ | |
1604 | if (ap_domain_index >= 0) | |
1605 | user_set_domain = 1; | |
1606 | ||
1534c382 | 1607 | if (ap_instructions_available() != 0) { |
136f7a1c MS |
1608 | pr_warning("The hardware system does not support " |
1609 | "AP instructions\n"); | |
1534c382 MS |
1610 | return -ENODEV; |
1611 | } | |
cb17a636 FB |
1612 | if (ap_interrupts_available()) { |
1613 | isc_register(AP_ISC); | |
1614 | ap_interrupt_indicator = s390_register_adapter_interrupt( | |
1615 | &ap_interrupt_handler, NULL, AP_ISC); | |
1616 | if (IS_ERR(ap_interrupt_indicator)) { | |
1617 | ap_interrupt_indicator = NULL; | |
1618 | isc_unregister(AP_ISC); | |
1619 | } | |
1620 | } | |
1621 | ||
85eca850 | 1622 | register_reset_call(&ap_reset_call); |
1534c382 MS |
1623 | |
1624 | /* Create /sys/bus/ap. */ | |
1625 | rc = bus_register(&ap_bus_type); | |
1626 | if (rc) | |
1627 | goto out; | |
1628 | for (i = 0; ap_bus_attrs[i]; i++) { | |
1629 | rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); | |
1630 | if (rc) | |
1631 | goto out_bus; | |
1632 | } | |
1633 | ||
1634 | /* Create /sys/devices/ap. */ | |
035da16f | 1635 | ap_root_device = root_device_register("ap"); |
1534c382 MS |
1636 | rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0; |
1637 | if (rc) | |
1638 | goto out_bus; | |
1639 | ||
1640 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
1641 | if (!ap_work_queue) { | |
1642 | rc = -ENOMEM; | |
1643 | goto out_root; | |
1644 | } | |
1645 | ||
1646 | if (ap_select_domain() == 0) | |
1647 | ap_scan_bus(NULL); | |
1648 | ||
1749a81d | 1649 | /* Setup the AP bus rescan timer. */ |
1534c382 MS |
1650 | init_timer(&ap_config_timer); |
1651 | ap_config_timer.function = ap_config_timeout; | |
1652 | ap_config_timer.data = 0; | |
1653 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1654 | add_timer(&ap_config_timer); | |
1655 | ||
fe137230 FB |
1656 | /* Setup the high resultion poll timer. |
1657 | * If we are running under z/VM adjust polling to z/VM polling rate. | |
1658 | */ | |
1659 | if (MACHINE_IS_VM) | |
1660 | poll_timeout = 1500000; | |
1661 | hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
1662 | ap_poll_timer.function = ap_poll_timeout; | |
1663 | ||
1534c382 MS |
1664 | /* Start the low priority AP bus poll thread. */ |
1665 | if (ap_thread_flag) { | |
1666 | rc = ap_poll_thread_start(); | |
1667 | if (rc) | |
1668 | goto out_work; | |
1669 | } | |
1670 | ||
1671 | return 0; | |
1672 | ||
1673 | out_work: | |
1674 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1675 | hrtimer_cancel(&ap_poll_timer); |
1534c382 MS |
1676 | destroy_workqueue(ap_work_queue); |
1677 | out_root: | |
035da16f | 1678 | root_device_unregister(ap_root_device); |
1534c382 MS |
1679 | out_bus: |
1680 | while (i--) | |
1681 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1682 | bus_unregister(&ap_bus_type); | |
1683 | out: | |
85eca850 | 1684 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1685 | if (ap_using_interrupts()) { |
1686 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1687 | isc_unregister(AP_ISC); | |
1688 | } | |
1534c382 MS |
1689 | return rc; |
1690 | } | |
1691 | ||
1692 | static int __ap_match_all(struct device *dev, void *data) | |
1693 | { | |
1694 | return 1; | |
1695 | } | |
1696 | ||
1697 | /** | |
1749a81d FB |
1698 | * ap_modules_exit(): The module termination code |
1699 | * | |
1700 | * Terminates the module. | |
1534c382 MS |
1701 | */ |
1702 | void ap_module_exit(void) | |
1703 | { | |
1704 | int i; | |
1705 | struct device *dev; | |
1706 | ||
13e742ba | 1707 | ap_reset_domain(); |
1534c382 MS |
1708 | ap_poll_thread_stop(); |
1709 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1710 | hrtimer_cancel(&ap_poll_timer); |
1534c382 | 1711 | destroy_workqueue(ap_work_queue); |
13e742ba | 1712 | tasklet_kill(&ap_tasklet); |
035da16f | 1713 | root_device_unregister(ap_root_device); |
1534c382 MS |
1714 | while ((dev = bus_find_device(&ap_bus_type, NULL, NULL, |
1715 | __ap_match_all))) | |
1716 | { | |
1717 | device_unregister(dev); | |
1718 | put_device(dev); | |
1719 | } | |
1720 | for (i = 0; ap_bus_attrs[i]; i++) | |
1721 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1722 | bus_unregister(&ap_bus_type); | |
85eca850 | 1723 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1724 | if (ap_using_interrupts()) { |
1725 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1726 | isc_unregister(AP_ISC); | |
1727 | } | |
1534c382 MS |
1728 | } |
1729 | ||
1730 | #ifndef CONFIG_ZCRYPT_MONOLITHIC | |
1731 | module_init(ap_module_init); | |
1732 | module_exit(ap_module_exit); | |
1733 | #endif |