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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> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1534c382 MS |
37 | #include <linux/notifier.h> |
38 | #include <linux/kthread.h> | |
39 | #include <linux/mutex.h> | |
85eca850 | 40 | #include <asm/reset.h> |
cb17a636 FB |
41 | #include <asm/airq.h> |
42 | #include <asm/atomic.h> | |
43 | #include <asm/system.h> | |
44 | #include <asm/isc.h> | |
fe137230 FB |
45 | #include <linux/hrtimer.h> |
46 | #include <linux/ktime.h> | |
1534c382 MS |
47 | |
48 | #include "ap_bus.h" | |
49 | ||
50 | /* Some prototypes. */ | |
4927b3f7 | 51 | static void ap_scan_bus(struct work_struct *); |
1534c382 | 52 | static void ap_poll_all(unsigned long); |
fe137230 | 53 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *); |
1534c382 MS |
54 | static int ap_poll_thread_start(void); |
55 | static void ap_poll_thread_stop(void); | |
af512ed0 | 56 | static void ap_request_timeout(unsigned long); |
cb17a636 | 57 | static inline void ap_schedule_poll_timer(void); |
772f5472 FB |
58 | static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags); |
59 | static int ap_device_remove(struct device *dev); | |
60 | static int ap_device_probe(struct device *dev); | |
61 | static void ap_interrupt_handler(void *unused1, void *unused2); | |
62 | static void ap_reset(struct ap_device *ap_dev); | |
63 | static void ap_config_timeout(unsigned long ptr); | |
5314af69 | 64 | static int ap_select_domain(void); |
1534c382 | 65 | |
1749a81d | 66 | /* |
1534c382 MS |
67 | * Module description. |
68 | */ | |
69 | MODULE_AUTHOR("IBM Corporation"); | |
70 | MODULE_DESCRIPTION("Adjunct Processor Bus driver, " | |
71 | "Copyright 2006 IBM Corporation"); | |
72 | MODULE_LICENSE("GPL"); | |
73 | ||
1749a81d | 74 | /* |
1534c382 MS |
75 | * Module parameter |
76 | */ | |
77 | int ap_domain_index = -1; /* Adjunct Processor Domain Index */ | |
78 | module_param_named(domain, ap_domain_index, int, 0000); | |
79 | MODULE_PARM_DESC(domain, "domain index for ap devices"); | |
80 | EXPORT_SYMBOL(ap_domain_index); | |
81 | ||
b90b34c6 | 82 | static int ap_thread_flag = 0; |
1534c382 | 83 | module_param_named(poll_thread, ap_thread_flag, int, 0000); |
b90b34c6 | 84 | MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); |
1534c382 MS |
85 | |
86 | static struct device *ap_root_device = NULL; | |
43c207e6 | 87 | static DEFINE_SPINLOCK(ap_device_list_lock); |
cf352ce0 | 88 | static LIST_HEAD(ap_device_list); |
1534c382 | 89 | |
1749a81d | 90 | /* |
1534c382 MS |
91 | * Workqueue & timer for bus rescan. |
92 | */ | |
93 | static struct workqueue_struct *ap_work_queue; | |
94 | static struct timer_list ap_config_timer; | |
95 | static int ap_config_time = AP_CONFIG_TIME; | |
4927b3f7 | 96 | static DECLARE_WORK(ap_config_work, ap_scan_bus); |
1534c382 | 97 | |
1749a81d | 98 | /* |
cb17a636 | 99 | * Tasklet & timer for AP request polling and interrupts |
1534c382 | 100 | */ |
1534c382 MS |
101 | static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0); |
102 | static atomic_t ap_poll_requests = ATOMIC_INIT(0); | |
103 | static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); | |
104 | static struct task_struct *ap_poll_kthread = NULL; | |
105 | static DEFINE_MUTEX(ap_poll_thread_mutex); | |
93521314 | 106 | static DEFINE_SPINLOCK(ap_poll_timer_lock); |
cb17a636 | 107 | static void *ap_interrupt_indicator; |
fe137230 FB |
108 | static struct hrtimer ap_poll_timer; |
109 | /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. | |
110 | * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ | |
111 | static unsigned long long poll_timeout = 250000; | |
1534c382 | 112 | |
772f5472 FB |
113 | /* Suspend flag */ |
114 | static int ap_suspend_flag; | |
5314af69 FB |
115 | /* Flag to check if domain was set through module parameter domain=. This is |
116 | * important when supsend and resume is done in a z/VM environment where the | |
117 | * domain might change. */ | |
118 | static int user_set_domain = 0; | |
772f5472 FB |
119 | static struct bus_type ap_bus_type; |
120 | ||
cb17a636 FB |
121 | /** |
122 | * ap_using_interrupts() - Returns non-zero if interrupt support is | |
123 | * available. | |
124 | */ | |
125 | static inline int ap_using_interrupts(void) | |
126 | { | |
127 | return ap_interrupt_indicator != NULL; | |
128 | } | |
129 | ||
1534c382 | 130 | /** |
1749a81d | 131 | * ap_intructions_available() - Test if AP instructions are available. |
1534c382 | 132 | * |
1749a81d | 133 | * Returns 0 if the AP instructions are installed. |
1534c382 MS |
134 | */ |
135 | static inline int ap_instructions_available(void) | |
136 | { | |
137 | register unsigned long reg0 asm ("0") = AP_MKQID(0,0); | |
138 | register unsigned long reg1 asm ("1") = -ENODEV; | |
139 | register unsigned long reg2 asm ("2") = 0UL; | |
140 | ||
141 | asm volatile( | |
142 | " .long 0xb2af0000\n" /* PQAP(TAPQ) */ | |
143 | "0: la %1,0\n" | |
144 | "1:\n" | |
145 | EX_TABLE(0b, 1b) | |
146 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" ); | |
147 | return reg1; | |
148 | } | |
149 | ||
cb17a636 FB |
150 | /** |
151 | * ap_interrupts_available(): Test if AP interrupts are available. | |
152 | * | |
153 | * Returns 1 if AP interrupts are available. | |
154 | */ | |
155 | static int ap_interrupts_available(void) | |
156 | { | |
157 | unsigned long long facility_bits[2]; | |
158 | ||
159 | if (stfle(facility_bits, 2) <= 1) | |
160 | return 0; | |
161 | if (!(facility_bits[0] & (1ULL << 61)) || | |
162 | !(facility_bits[1] & (1ULL << 62))) | |
163 | return 0; | |
164 | return 1; | |
165 | } | |
166 | ||
1534c382 | 167 | /** |
1749a81d FB |
168 | * ap_test_queue(): Test adjunct processor queue. |
169 | * @qid: The AP queue number | |
170 | * @queue_depth: Pointer to queue depth value | |
171 | * @device_type: Pointer to device type value | |
1534c382 | 172 | * |
1749a81d | 173 | * Returns AP queue status structure. |
1534c382 MS |
174 | */ |
175 | static inline struct ap_queue_status | |
176 | ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
177 | { | |
178 | register unsigned long reg0 asm ("0") = qid; | |
179 | register struct ap_queue_status reg1 asm ("1"); | |
180 | register unsigned long reg2 asm ("2") = 0UL; | |
181 | ||
182 | asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */ | |
183 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
184 | *device_type = (int) (reg2 >> 24); | |
185 | *queue_depth = (int) (reg2 & 0xff); | |
186 | return reg1; | |
187 | } | |
188 | ||
189 | /** | |
1749a81d FB |
190 | * ap_reset_queue(): Reset adjunct processor queue. |
191 | * @qid: The AP queue number | |
1534c382 | 192 | * |
1749a81d | 193 | * Returns AP queue status structure. |
1534c382 MS |
194 | */ |
195 | static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) | |
196 | { | |
197 | register unsigned long reg0 asm ("0") = qid | 0x01000000UL; | |
198 | register struct ap_queue_status reg1 asm ("1"); | |
199 | register unsigned long reg2 asm ("2") = 0UL; | |
200 | ||
201 | asm volatile( | |
202 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
203 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
204 | return reg1; | |
205 | } | |
206 | ||
cb17a636 FB |
207 | #ifdef CONFIG_64BIT |
208 | /** | |
209 | * ap_queue_interruption_control(): Enable interruption for a specific AP. | |
210 | * @qid: The AP queue number | |
211 | * @ind: The notification indicator byte | |
212 | * | |
213 | * Returns AP queue status. | |
214 | */ | |
215 | static inline struct ap_queue_status | |
216 | ap_queue_interruption_control(ap_qid_t qid, void *ind) | |
217 | { | |
218 | register unsigned long reg0 asm ("0") = qid | 0x03000000UL; | |
219 | register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC; | |
220 | register struct ap_queue_status reg1_out asm ("1"); | |
221 | register void *reg2 asm ("2") = ind; | |
222 | asm volatile( | |
223 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
224 | : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) | |
225 | : | |
226 | : "cc" ); | |
227 | return reg1_out; | |
228 | } | |
229 | #endif | |
230 | ||
231 | /** | |
232 | * ap_queue_enable_interruption(): Enable interruption on an AP. | |
233 | * @qid: The AP queue number | |
234 | * @ind: the notification indicator byte | |
235 | * | |
236 | * Enables interruption on AP queue via ap_queue_interruption_control(). Based | |
237 | * on the return value it waits a while and tests the AP queue if interrupts | |
238 | * have been switched on using ap_test_queue(). | |
239 | */ | |
240 | static int ap_queue_enable_interruption(ap_qid_t qid, void *ind) | |
241 | { | |
242 | #ifdef CONFIG_64BIT | |
243 | struct ap_queue_status status; | |
244 | int t_depth, t_device_type, rc, i; | |
245 | ||
246 | rc = -EBUSY; | |
247 | status = ap_queue_interruption_control(qid, ind); | |
248 | ||
249 | for (i = 0; i < AP_MAX_RESET; i++) { | |
250 | switch (status.response_code) { | |
251 | case AP_RESPONSE_NORMAL: | |
252 | if (status.int_enabled) | |
253 | return 0; | |
254 | break; | |
255 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
256 | case AP_RESPONSE_BUSY: | |
257 | break; | |
258 | case AP_RESPONSE_Q_NOT_AVAIL: | |
259 | case AP_RESPONSE_DECONFIGURED: | |
260 | case AP_RESPONSE_CHECKSTOPPED: | |
261 | case AP_RESPONSE_INVALID_ADDRESS: | |
262 | return -ENODEV; | |
263 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
264 | if (status.int_enabled) | |
265 | return 0; | |
266 | break; | |
267 | default: | |
268 | break; | |
269 | } | |
270 | if (i < AP_MAX_RESET - 1) { | |
271 | udelay(5); | |
272 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
273 | } | |
274 | } | |
275 | return rc; | |
276 | #else | |
277 | return -EINVAL; | |
278 | #endif | |
279 | } | |
280 | ||
1534c382 | 281 | /** |
1749a81d FB |
282 | * __ap_send(): Send message to adjunct processor queue. |
283 | * @qid: The AP queue number | |
284 | * @psmid: The program supplied message identifier | |
285 | * @msg: The message text | |
286 | * @length: The message length | |
a6a5d73a | 287 | * @special: Special Bit |
1534c382 | 288 | * |
1749a81d | 289 | * Returns AP queue status structure. |
1534c382 | 290 | * Condition code 1 on NQAP can't happen because the L bit is 1. |
1534c382 MS |
291 | * Condition code 2 on NQAP also means the send is incomplete, |
292 | * because a segment boundary was reached. The NQAP is repeated. | |
293 | */ | |
294 | static inline struct ap_queue_status | |
a6a5d73a FB |
295 | __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length, |
296 | unsigned int special) | |
1534c382 MS |
297 | { |
298 | typedef struct { char _[length]; } msgblock; | |
299 | register unsigned long reg0 asm ("0") = qid | 0x40000000UL; | |
300 | register struct ap_queue_status reg1 asm ("1"); | |
301 | register unsigned long reg2 asm ("2") = (unsigned long) msg; | |
302 | register unsigned long reg3 asm ("3") = (unsigned long) length; | |
303 | register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32); | |
304 | register unsigned long reg5 asm ("5") = (unsigned int) psmid; | |
305 | ||
a6a5d73a FB |
306 | if (special == 1) |
307 | reg0 |= 0x400000UL; | |
308 | ||
1534c382 MS |
309 | asm volatile ( |
310 | "0: .long 0xb2ad0042\n" /* DQAP */ | |
311 | " brc 2,0b" | |
312 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) | |
313 | : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) | |
314 | : "cc" ); | |
315 | return reg1; | |
316 | } | |
317 | ||
318 | int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
319 | { | |
320 | struct ap_queue_status status; | |
321 | ||
a6a5d73a | 322 | status = __ap_send(qid, psmid, msg, length, 0); |
1534c382 MS |
323 | switch (status.response_code) { |
324 | case AP_RESPONSE_NORMAL: | |
325 | return 0; | |
326 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 327 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 | 328 | return -EBUSY; |
a6a5d73a FB |
329 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
330 | return -EINVAL; | |
1534c382 MS |
331 | default: /* Device is gone. */ |
332 | return -ENODEV; | |
333 | } | |
334 | } | |
335 | EXPORT_SYMBOL(ap_send); | |
336 | ||
1749a81d FB |
337 | /** |
338 | * __ap_recv(): Receive message from adjunct processor queue. | |
339 | * @qid: The AP queue number | |
340 | * @psmid: Pointer to program supplied message identifier | |
341 | * @msg: The message text | |
342 | * @length: The message length | |
1534c382 | 343 | * |
1749a81d | 344 | * Returns AP queue status structure. |
1534c382 MS |
345 | * Condition code 1 on DQAP means the receive has taken place |
346 | * but only partially. The response is incomplete, hence the | |
347 | * DQAP is repeated. | |
1534c382 MS |
348 | * Condition code 2 on DQAP also means the receive is incomplete, |
349 | * this time because a segment boundary was reached. Again, the | |
350 | * DQAP is repeated. | |
1534c382 MS |
351 | * Note that gpr2 is used by the DQAP instruction to keep track of |
352 | * any 'residual' length, in case the instruction gets interrupted. | |
353 | * Hence it gets zeroed before the instruction. | |
354 | */ | |
355 | static inline struct ap_queue_status | |
356 | __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
357 | { | |
358 | typedef struct { char _[length]; } msgblock; | |
359 | register unsigned long reg0 asm("0") = qid | 0x80000000UL; | |
360 | register struct ap_queue_status reg1 asm ("1"); | |
361 | register unsigned long reg2 asm("2") = 0UL; | |
362 | register unsigned long reg4 asm("4") = (unsigned long) msg; | |
363 | register unsigned long reg5 asm("5") = (unsigned long) length; | |
364 | register unsigned long reg6 asm("6") = 0UL; | |
365 | register unsigned long reg7 asm("7") = 0UL; | |
366 | ||
367 | ||
368 | asm volatile( | |
369 | "0: .long 0xb2ae0064\n" | |
370 | " brc 6,0b\n" | |
371 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), | |
372 | "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), | |
373 | "=m" (*(msgblock *) msg) : : "cc" ); | |
374 | *psmid = (((unsigned long long) reg6) << 32) + reg7; | |
375 | return reg1; | |
376 | } | |
377 | ||
378 | int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
379 | { | |
380 | struct ap_queue_status status; | |
381 | ||
382 | status = __ap_recv(qid, psmid, msg, length); | |
383 | switch (status.response_code) { | |
384 | case AP_RESPONSE_NORMAL: | |
385 | return 0; | |
386 | case AP_RESPONSE_NO_PENDING_REPLY: | |
387 | if (status.queue_empty) | |
388 | return -ENOENT; | |
389 | return -EBUSY; | |
af512ed0 RW |
390 | case AP_RESPONSE_RESET_IN_PROGRESS: |
391 | return -EBUSY; | |
1534c382 MS |
392 | default: |
393 | return -ENODEV; | |
394 | } | |
395 | } | |
396 | EXPORT_SYMBOL(ap_recv); | |
397 | ||
398 | /** | |
1749a81d FB |
399 | * ap_query_queue(): Check if an AP queue is available. |
400 | * @qid: The AP queue number | |
401 | * @queue_depth: Pointer to queue depth value | |
402 | * @device_type: Pointer to device type value | |
403 | * | |
404 | * The test is repeated for AP_MAX_RESET times. | |
1534c382 MS |
405 | */ |
406 | static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
407 | { | |
408 | struct ap_queue_status status; | |
409 | int t_depth, t_device_type, rc, i; | |
410 | ||
411 | rc = -EBUSY; | |
412 | for (i = 0; i < AP_MAX_RESET; i++) { | |
413 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
414 | switch (status.response_code) { | |
415 | case AP_RESPONSE_NORMAL: | |
416 | *queue_depth = t_depth + 1; | |
417 | *device_type = t_device_type; | |
418 | rc = 0; | |
419 | break; | |
420 | case AP_RESPONSE_Q_NOT_AVAIL: | |
421 | rc = -ENODEV; | |
422 | break; | |
423 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
424 | break; | |
425 | case AP_RESPONSE_DECONFIGURED: | |
426 | rc = -ENODEV; | |
427 | break; | |
428 | case AP_RESPONSE_CHECKSTOPPED: | |
429 | rc = -ENODEV; | |
430 | break; | |
cb17a636 FB |
431 | case AP_RESPONSE_INVALID_ADDRESS: |
432 | rc = -ENODEV; | |
433 | break; | |
434 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
435 | break; | |
1534c382 MS |
436 | case AP_RESPONSE_BUSY: |
437 | break; | |
438 | default: | |
439 | BUG(); | |
440 | } | |
441 | if (rc != -EBUSY) | |
442 | break; | |
443 | if (i < AP_MAX_RESET - 1) | |
444 | udelay(5); | |
445 | } | |
446 | return rc; | |
447 | } | |
448 | ||
449 | /** | |
1749a81d FB |
450 | * ap_init_queue(): Reset an AP queue. |
451 | * @qid: The AP queue number | |
452 | * | |
1534c382 | 453 | * Reset an AP queue and wait for it to become available again. |
1534c382 MS |
454 | */ |
455 | static int ap_init_queue(ap_qid_t qid) | |
456 | { | |
457 | struct ap_queue_status status; | |
458 | int rc, dummy, i; | |
459 | ||
460 | rc = -ENODEV; | |
461 | status = ap_reset_queue(qid); | |
462 | for (i = 0; i < AP_MAX_RESET; i++) { | |
463 | switch (status.response_code) { | |
464 | case AP_RESPONSE_NORMAL: | |
465 | if (status.queue_empty) | |
466 | rc = 0; | |
467 | break; | |
468 | case AP_RESPONSE_Q_NOT_AVAIL: | |
469 | case AP_RESPONSE_DECONFIGURED: | |
470 | case AP_RESPONSE_CHECKSTOPPED: | |
471 | i = AP_MAX_RESET; /* return with -ENODEV */ | |
472 | break; | |
473 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
af512ed0 | 474 | rc = -EBUSY; |
1534c382 MS |
475 | case AP_RESPONSE_BUSY: |
476 | default: | |
477 | break; | |
478 | } | |
af512ed0 | 479 | if (rc != -ENODEV && rc != -EBUSY) |
1534c382 MS |
480 | break; |
481 | if (i < AP_MAX_RESET - 1) { | |
482 | udelay(5); | |
483 | status = ap_test_queue(qid, &dummy, &dummy); | |
484 | } | |
485 | } | |
cb17a636 FB |
486 | if (rc == 0 && ap_using_interrupts()) { |
487 | rc = ap_queue_enable_interruption(qid, ap_interrupt_indicator); | |
488 | /* If interruption mode is supported by the machine, | |
489 | * but an AP can not be enabled for interruption then | |
490 | * the AP will be discarded. */ | |
491 | if (rc) | |
492 | pr_err("Registering adapter interrupts for " | |
493 | "AP %d failed\n", AP_QID_DEVICE(qid)); | |
494 | } | |
1534c382 MS |
495 | return rc; |
496 | } | |
497 | ||
af512ed0 | 498 | /** |
1749a81d FB |
499 | * ap_increase_queue_count(): Arm request timeout. |
500 | * @ap_dev: Pointer to an AP device. | |
501 | * | |
502 | * Arm request timeout if an AP device was idle and a new request is submitted. | |
af512ed0 RW |
503 | */ |
504 | static void ap_increase_queue_count(struct ap_device *ap_dev) | |
505 | { | |
506 | int timeout = ap_dev->drv->request_timeout; | |
507 | ||
508 | ap_dev->queue_count++; | |
509 | if (ap_dev->queue_count == 1) { | |
510 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
511 | ap_dev->reset = AP_RESET_ARMED; | |
512 | } | |
513 | } | |
514 | ||
515 | /** | |
1749a81d FB |
516 | * ap_decrease_queue_count(): Decrease queue count. |
517 | * @ap_dev: Pointer to an AP device. | |
518 | * | |
519 | * If AP device is still alive, re-schedule request timeout if there are still | |
af512ed0 RW |
520 | * pending requests. |
521 | */ | |
522 | static void ap_decrease_queue_count(struct ap_device *ap_dev) | |
523 | { | |
524 | int timeout = ap_dev->drv->request_timeout; | |
525 | ||
526 | ap_dev->queue_count--; | |
527 | if (ap_dev->queue_count > 0) | |
528 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
529 | else | |
1749a81d | 530 | /* |
af512ed0 RW |
531 | * The timeout timer should to be disabled now - since |
532 | * del_timer_sync() is very expensive, we just tell via the | |
533 | * reset flag to ignore the pending timeout timer. | |
534 | */ | |
535 | ap_dev->reset = AP_RESET_IGNORE; | |
536 | } | |
537 | ||
1749a81d | 538 | /* |
1534c382 MS |
539 | * AP device related attributes. |
540 | */ | |
541 | static ssize_t ap_hwtype_show(struct device *dev, | |
542 | struct device_attribute *attr, char *buf) | |
543 | { | |
544 | struct ap_device *ap_dev = to_ap_dev(dev); | |
545 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); | |
546 | } | |
1534c382 | 547 | |
43c207e6 | 548 | static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); |
1534c382 MS |
549 | static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr, |
550 | char *buf) | |
551 | { | |
552 | struct ap_device *ap_dev = to_ap_dev(dev); | |
553 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth); | |
554 | } | |
1534c382 | 555 | |
43c207e6 | 556 | static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); |
1534c382 MS |
557 | static ssize_t ap_request_count_show(struct device *dev, |
558 | struct device_attribute *attr, | |
559 | char *buf) | |
560 | { | |
561 | struct ap_device *ap_dev = to_ap_dev(dev); | |
562 | int rc; | |
563 | ||
564 | spin_lock_bh(&ap_dev->lock); | |
565 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count); | |
566 | spin_unlock_bh(&ap_dev->lock); | |
567 | return rc; | |
568 | } | |
569 | ||
570 | static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); | |
571 | ||
572 | static ssize_t ap_modalias_show(struct device *dev, | |
573 | struct device_attribute *attr, char *buf) | |
574 | { | |
575 | return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type); | |
576 | } | |
577 | ||
578 | static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); | |
579 | ||
580 | static struct attribute *ap_dev_attrs[] = { | |
581 | &dev_attr_hwtype.attr, | |
582 | &dev_attr_depth.attr, | |
583 | &dev_attr_request_count.attr, | |
584 | &dev_attr_modalias.attr, | |
585 | NULL | |
586 | }; | |
587 | static struct attribute_group ap_dev_attr_group = { | |
588 | .attrs = ap_dev_attrs | |
589 | }; | |
590 | ||
591 | /** | |
1749a81d FB |
592 | * ap_bus_match() |
593 | * @dev: Pointer to device | |
594 | * @drv: Pointer to device_driver | |
595 | * | |
1534c382 MS |
596 | * AP bus driver registration/unregistration. |
597 | */ | |
598 | static int ap_bus_match(struct device *dev, struct device_driver *drv) | |
599 | { | |
600 | struct ap_device *ap_dev = to_ap_dev(dev); | |
601 | struct ap_driver *ap_drv = to_ap_drv(drv); | |
602 | struct ap_device_id *id; | |
603 | ||
1749a81d | 604 | /* |
1534c382 MS |
605 | * Compare device type of the device with the list of |
606 | * supported types of the device_driver. | |
607 | */ | |
608 | for (id = ap_drv->ids; id->match_flags; id++) { | |
609 | if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) && | |
610 | (id->dev_type != ap_dev->device_type)) | |
611 | continue; | |
612 | return 1; | |
613 | } | |
614 | return 0; | |
615 | } | |
616 | ||
617 | /** | |
1749a81d FB |
618 | * ap_uevent(): Uevent function for AP devices. |
619 | * @dev: Pointer to device | |
620 | * @env: Pointer to kobj_uevent_env | |
621 | * | |
622 | * It sets up a single environment variable DEV_TYPE which contains the | |
623 | * hardware device type. | |
1534c382 | 624 | */ |
7eff2e7a | 625 | static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) |
1534c382 MS |
626 | { |
627 | struct ap_device *ap_dev = to_ap_dev(dev); | |
7eff2e7a | 628 | int retval = 0; |
1534c382 MS |
629 | |
630 | if (!ap_dev) | |
631 | return -ENODEV; | |
632 | ||
633 | /* Set up DEV_TYPE environment variable. */ | |
7eff2e7a | 634 | retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); |
bf62456e ER |
635 | if (retval) |
636 | return retval; | |
637 | ||
66a4263b | 638 | /* Add MODALIAS= */ |
7eff2e7a | 639 | retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); |
bf62456e | 640 | |
bf62456e | 641 | return retval; |
1534c382 MS |
642 | } |
643 | ||
772f5472 FB |
644 | static int ap_bus_suspend(struct device *dev, pm_message_t state) |
645 | { | |
646 | struct ap_device *ap_dev = to_ap_dev(dev); | |
647 | unsigned long flags; | |
648 | ||
649 | if (!ap_suspend_flag) { | |
650 | ap_suspend_flag = 1; | |
651 | ||
652 | /* Disable scanning for devices, thus we do not want to scan | |
653 | * for them after removing. | |
654 | */ | |
655 | del_timer_sync(&ap_config_timer); | |
656 | if (ap_work_queue != NULL) { | |
657 | destroy_workqueue(ap_work_queue); | |
658 | ap_work_queue = NULL; | |
659 | } | |
5314af69 | 660 | |
772f5472 FB |
661 | tasklet_disable(&ap_tasklet); |
662 | } | |
663 | /* Poll on the device until all requests are finished. */ | |
664 | do { | |
665 | flags = 0; | |
95f1556c | 666 | spin_lock_bh(&ap_dev->lock); |
772f5472 | 667 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 668 | spin_unlock_bh(&ap_dev->lock); |
772f5472 FB |
669 | } while ((flags & 1) || (flags & 2)); |
670 | ||
5314af69 FB |
671 | spin_lock_bh(&ap_dev->lock); |
672 | ap_dev->unregistered = 1; | |
673 | spin_unlock_bh(&ap_dev->lock); | |
674 | ||
772f5472 FB |
675 | return 0; |
676 | } | |
677 | ||
678 | static int ap_bus_resume(struct device *dev) | |
679 | { | |
680 | int rc = 0; | |
681 | struct ap_device *ap_dev = to_ap_dev(dev); | |
682 | ||
683 | if (ap_suspend_flag) { | |
684 | ap_suspend_flag = 0; | |
685 | if (!ap_interrupts_available()) | |
686 | ap_interrupt_indicator = NULL; | |
5314af69 FB |
687 | if (!user_set_domain) { |
688 | ap_domain_index = -1; | |
689 | ap_select_domain(); | |
690 | } | |
772f5472 FB |
691 | init_timer(&ap_config_timer); |
692 | ap_config_timer.function = ap_config_timeout; | |
693 | ap_config_timer.data = 0; | |
694 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
695 | add_timer(&ap_config_timer); | |
696 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
697 | if (!ap_work_queue) | |
698 | return -ENOMEM; | |
699 | tasklet_enable(&ap_tasklet); | |
700 | if (!ap_using_interrupts()) | |
701 | ap_schedule_poll_timer(); | |
702 | else | |
703 | tasklet_schedule(&ap_tasklet); | |
704 | if (ap_thread_flag) | |
705 | rc = ap_poll_thread_start(); | |
772f5472 | 706 | } |
5314af69 FB |
707 | if (AP_QID_QUEUE(ap_dev->qid) != ap_domain_index) { |
708 | spin_lock_bh(&ap_dev->lock); | |
709 | ap_dev->qid = AP_MKQID(AP_QID_DEVICE(ap_dev->qid), | |
710 | ap_domain_index); | |
711 | spin_unlock_bh(&ap_dev->lock); | |
712 | } | |
713 | queue_work(ap_work_queue, &ap_config_work); | |
772f5472 FB |
714 | |
715 | return rc; | |
716 | } | |
717 | ||
1534c382 MS |
718 | static struct bus_type ap_bus_type = { |
719 | .name = "ap", | |
720 | .match = &ap_bus_match, | |
721 | .uevent = &ap_uevent, | |
772f5472 FB |
722 | .suspend = ap_bus_suspend, |
723 | .resume = ap_bus_resume | |
1534c382 MS |
724 | }; |
725 | ||
726 | static int ap_device_probe(struct device *dev) | |
727 | { | |
728 | struct ap_device *ap_dev = to_ap_dev(dev); | |
729 | struct ap_driver *ap_drv = to_ap_drv(dev->driver); | |
730 | int rc; | |
731 | ||
732 | ap_dev->drv = ap_drv; | |
733 | rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; | |
faa582ca | 734 | if (!rc) { |
43c207e6 | 735 | spin_lock_bh(&ap_device_list_lock); |
faa582ca | 736 | list_add(&ap_dev->list, &ap_device_list); |
43c207e6 | 737 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca | 738 | } |
1534c382 MS |
739 | return rc; |
740 | } | |
741 | ||
742 | /** | |
1749a81d FB |
743 | * __ap_flush_queue(): Flush requests. |
744 | * @ap_dev: Pointer to the AP device | |
745 | * | |
1534c382 | 746 | * Flush all requests from the request/pending queue of an AP device. |
1534c382 | 747 | */ |
4d284cac | 748 | static void __ap_flush_queue(struct ap_device *ap_dev) |
1534c382 MS |
749 | { |
750 | struct ap_message *ap_msg, *next; | |
751 | ||
752 | list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) { | |
753 | list_del_init(&ap_msg->list); | |
754 | ap_dev->pendingq_count--; | |
755 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
756 | } | |
757 | list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) { | |
758 | list_del_init(&ap_msg->list); | |
759 | ap_dev->requestq_count--; | |
760 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
761 | } | |
762 | } | |
763 | ||
764 | void ap_flush_queue(struct ap_device *ap_dev) | |
765 | { | |
766 | spin_lock_bh(&ap_dev->lock); | |
767 | __ap_flush_queue(ap_dev); | |
768 | spin_unlock_bh(&ap_dev->lock); | |
769 | } | |
770 | EXPORT_SYMBOL(ap_flush_queue); | |
771 | ||
772 | static int ap_device_remove(struct device *dev) | |
773 | { | |
774 | struct ap_device *ap_dev = to_ap_dev(dev); | |
775 | struct ap_driver *ap_drv = ap_dev->drv; | |
776 | ||
4e56296d | 777 | ap_flush_queue(ap_dev); |
af512ed0 | 778 | del_timer_sync(&ap_dev->timeout); |
43c207e6 | 779 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 780 | list_del_init(&ap_dev->list); |
43c207e6 | 781 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca RW |
782 | if (ap_drv->remove) |
783 | ap_drv->remove(ap_dev); | |
e675c0d2 RW |
784 | spin_lock_bh(&ap_dev->lock); |
785 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
786 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
787 | return 0; |
788 | } | |
789 | ||
790 | int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, | |
791 | char *name) | |
792 | { | |
793 | struct device_driver *drv = &ap_drv->driver; | |
794 | ||
795 | drv->bus = &ap_bus_type; | |
796 | drv->probe = ap_device_probe; | |
797 | drv->remove = ap_device_remove; | |
798 | drv->owner = owner; | |
799 | drv->name = name; | |
800 | return driver_register(drv); | |
801 | } | |
802 | EXPORT_SYMBOL(ap_driver_register); | |
803 | ||
804 | void ap_driver_unregister(struct ap_driver *ap_drv) | |
805 | { | |
806 | driver_unregister(&ap_drv->driver); | |
807 | } | |
808 | EXPORT_SYMBOL(ap_driver_unregister); | |
809 | ||
1749a81d | 810 | /* |
1534c382 MS |
811 | * AP bus attributes. |
812 | */ | |
813 | static ssize_t ap_domain_show(struct bus_type *bus, char *buf) | |
814 | { | |
815 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); | |
816 | } | |
817 | ||
818 | static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL); | |
819 | ||
820 | static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) | |
821 | { | |
822 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); | |
823 | } | |
824 | ||
cb17a636 FB |
825 | static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) |
826 | { | |
827 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
828 | ap_using_interrupts() ? 1 : 0); | |
829 | } | |
830 | ||
831 | static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); | |
832 | ||
1534c382 MS |
833 | static ssize_t ap_config_time_store(struct bus_type *bus, |
834 | const char *buf, size_t count) | |
835 | { | |
836 | int time; | |
837 | ||
838 | if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) | |
839 | return -EINVAL; | |
840 | ap_config_time = time; | |
841 | if (!timer_pending(&ap_config_timer) || | |
842 | !mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) { | |
843 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
844 | add_timer(&ap_config_timer); | |
845 | } | |
846 | return count; | |
847 | } | |
848 | ||
849 | static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); | |
850 | ||
851 | static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) | |
852 | { | |
853 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); | |
854 | } | |
855 | ||
856 | static ssize_t ap_poll_thread_store(struct bus_type *bus, | |
857 | const char *buf, size_t count) | |
858 | { | |
859 | int flag, rc; | |
860 | ||
861 | if (sscanf(buf, "%d\n", &flag) != 1) | |
862 | return -EINVAL; | |
863 | if (flag) { | |
864 | rc = ap_poll_thread_start(); | |
865 | if (rc) | |
866 | return rc; | |
867 | } | |
868 | else | |
869 | ap_poll_thread_stop(); | |
870 | return count; | |
871 | } | |
872 | ||
873 | static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); | |
874 | ||
fe137230 FB |
875 | static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) |
876 | { | |
877 | return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); | |
878 | } | |
879 | ||
880 | static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, | |
881 | size_t count) | |
882 | { | |
883 | unsigned long long time; | |
884 | ktime_t hr_time; | |
885 | ||
886 | /* 120 seconds = maximum poll interval */ | |
cb17a636 FB |
887 | if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || |
888 | time > 120000000000ULL) | |
fe137230 FB |
889 | return -EINVAL; |
890 | poll_timeout = time; | |
891 | hr_time = ktime_set(0, poll_timeout); | |
892 | ||
893 | if (!hrtimer_is_queued(&ap_poll_timer) || | |
6c644eae AV |
894 | !hrtimer_forward(&ap_poll_timer, hrtimer_get_expires(&ap_poll_timer), hr_time)) { |
895 | hrtimer_set_expires(&ap_poll_timer, hr_time); | |
896 | hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); | |
fe137230 FB |
897 | } |
898 | return count; | |
899 | } | |
900 | ||
901 | static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); | |
902 | ||
1534c382 MS |
903 | static struct bus_attribute *const ap_bus_attrs[] = { |
904 | &bus_attr_ap_domain, | |
905 | &bus_attr_config_time, | |
906 | &bus_attr_poll_thread, | |
cb17a636 | 907 | &bus_attr_ap_interrupts, |
fe137230 FB |
908 | &bus_attr_poll_timeout, |
909 | NULL, | |
1534c382 MS |
910 | }; |
911 | ||
912 | /** | |
1749a81d FB |
913 | * ap_select_domain(): Select an AP domain. |
914 | * | |
915 | * Pick one of the 16 AP domains. | |
1534c382 | 916 | */ |
4d284cac | 917 | static int ap_select_domain(void) |
1534c382 MS |
918 | { |
919 | int queue_depth, device_type, count, max_count, best_domain; | |
920 | int rc, i, j; | |
921 | ||
1749a81d | 922 | /* |
1534c382 MS |
923 | * We want to use a single domain. Either the one specified with |
924 | * the "domain=" parameter or the domain with the maximum number | |
925 | * of devices. | |
926 | */ | |
927 | if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS) | |
928 | /* Domain has already been selected. */ | |
929 | return 0; | |
930 | best_domain = -1; | |
931 | max_count = 0; | |
932 | for (i = 0; i < AP_DOMAINS; i++) { | |
933 | count = 0; | |
934 | for (j = 0; j < AP_DEVICES; j++) { | |
935 | ap_qid_t qid = AP_MKQID(j, i); | |
936 | rc = ap_query_queue(qid, &queue_depth, &device_type); | |
937 | if (rc) | |
938 | continue; | |
939 | count++; | |
940 | } | |
941 | if (count > max_count) { | |
942 | max_count = count; | |
943 | best_domain = i; | |
944 | } | |
945 | } | |
946 | if (best_domain >= 0){ | |
947 | ap_domain_index = best_domain; | |
948 | return 0; | |
949 | } | |
950 | return -ENODEV; | |
951 | } | |
952 | ||
953 | /** | |
1749a81d | 954 | * ap_probe_device_type(): Find the device type of an AP. |
1534c382 | 955 | * @ap_dev: pointer to the AP device. |
1749a81d FB |
956 | * |
957 | * Find the device type if query queue returned a device type of 0. | |
1534c382 MS |
958 | */ |
959 | static int ap_probe_device_type(struct ap_device *ap_dev) | |
960 | { | |
961 | static unsigned char msg[] = { | |
962 | 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00, | |
963 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
964 | 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00, | |
965 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
966 | 0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50, | |
967 | 0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01, | |
968 | 0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00, | |
969 | 0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00, | |
970 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
971 | 0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00, | |
972 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
973 | 0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00, | |
974 | 0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00, | |
975 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
976 | 0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00, | |
977 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
978 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
979 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
980 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
981 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
982 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
983 | 0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00, | |
984 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
985 | 0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00, | |
986 | 0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20, | |
987 | 0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53, | |
988 | 0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22, | |
989 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
990 | 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88, | |
991 | 0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66, | |
992 | 0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44, | |
993 | 0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22, | |
994 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
995 | 0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77, | |
996 | 0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00, | |
997 | 0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00, | |
998 | 0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01, | |
999 | 0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c, | |
1000 | 0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68, | |
1001 | 0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66, | |
1002 | 0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0, | |
1003 | 0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8, | |
1004 | 0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04, | |
1005 | 0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57, | |
1006 | 0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d, | |
1007 | }; | |
1008 | struct ap_queue_status status; | |
1009 | unsigned long long psmid; | |
1010 | char *reply; | |
1011 | int rc, i; | |
1012 | ||
1013 | reply = (void *) get_zeroed_page(GFP_KERNEL); | |
1014 | if (!reply) { | |
1015 | rc = -ENOMEM; | |
1016 | goto out; | |
1017 | } | |
1018 | ||
1019 | status = __ap_send(ap_dev->qid, 0x0102030405060708ULL, | |
a6a5d73a | 1020 | msg, sizeof(msg), 0); |
1534c382 MS |
1021 | if (status.response_code != AP_RESPONSE_NORMAL) { |
1022 | rc = -ENODEV; | |
1023 | goto out_free; | |
1024 | } | |
1025 | ||
1026 | /* Wait for the test message to complete. */ | |
1027 | for (i = 0; i < 6; i++) { | |
1028 | mdelay(300); | |
1029 | status = __ap_recv(ap_dev->qid, &psmid, reply, 4096); | |
1030 | if (status.response_code == AP_RESPONSE_NORMAL && | |
1031 | psmid == 0x0102030405060708ULL) | |
1032 | break; | |
1033 | } | |
1034 | if (i < 6) { | |
1035 | /* Got an answer. */ | |
1036 | if (reply[0] == 0x00 && reply[1] == 0x86) | |
1037 | ap_dev->device_type = AP_DEVICE_TYPE_PCICC; | |
1038 | else | |
1039 | ap_dev->device_type = AP_DEVICE_TYPE_PCICA; | |
1040 | rc = 0; | |
1041 | } else | |
1042 | rc = -ENODEV; | |
1043 | ||
1044 | out_free: | |
1045 | free_page((unsigned long) reply); | |
1046 | out: | |
1047 | return rc; | |
1048 | } | |
1049 | ||
cb17a636 FB |
1050 | static void ap_interrupt_handler(void *unused1, void *unused2) |
1051 | { | |
1052 | tasklet_schedule(&ap_tasklet); | |
1053 | } | |
1054 | ||
1534c382 | 1055 | /** |
1749a81d FB |
1056 | * __ap_scan_bus(): Scan the AP bus. |
1057 | * @dev: Pointer to device | |
1058 | * @data: Pointer to data | |
1059 | * | |
1060 | * Scan the AP bus for new devices. | |
1534c382 MS |
1061 | */ |
1062 | static int __ap_scan_bus(struct device *dev, void *data) | |
1063 | { | |
1064 | return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data; | |
1065 | } | |
1066 | ||
1067 | static void ap_device_release(struct device *dev) | |
1068 | { | |
1069 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1070 | ||
1071 | kfree(ap_dev); | |
1072 | } | |
1073 | ||
4927b3f7 | 1074 | static void ap_scan_bus(struct work_struct *unused) |
1534c382 MS |
1075 | { |
1076 | struct ap_device *ap_dev; | |
1077 | struct device *dev; | |
1078 | ap_qid_t qid; | |
1079 | int queue_depth, device_type; | |
1080 | int rc, i; | |
1081 | ||
1082 | if (ap_select_domain() != 0) | |
1083 | return; | |
1084 | for (i = 0; i < AP_DEVICES; i++) { | |
1085 | qid = AP_MKQID(i, ap_domain_index); | |
1086 | dev = bus_find_device(&ap_bus_type, NULL, | |
1087 | (void *)(unsigned long)qid, | |
1088 | __ap_scan_bus); | |
f3b017d8 | 1089 | rc = ap_query_queue(qid, &queue_depth, &device_type); |
c6a48264 | 1090 | if (dev) { |
af512ed0 RW |
1091 | if (rc == -EBUSY) { |
1092 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1093 | schedule_timeout(AP_RESET_TIMEOUT); | |
1094 | rc = ap_query_queue(qid, &queue_depth, | |
1095 | &device_type); | |
1096 | } | |
c6a48264 RW |
1097 | ap_dev = to_ap_dev(dev); |
1098 | spin_lock_bh(&ap_dev->lock); | |
1099 | if (rc || ap_dev->unregistered) { | |
1100 | spin_unlock_bh(&ap_dev->lock); | |
5314af69 FB |
1101 | if (ap_dev->unregistered) |
1102 | i--; | |
c6a48264 | 1103 | device_unregister(dev); |
af512ed0 | 1104 | put_device(dev); |
c6a48264 | 1105 | continue; |
af512ed0 RW |
1106 | } |
1107 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
1108 | put_device(dev); |
1109 | continue; | |
1110 | } | |
1534c382 MS |
1111 | if (rc) |
1112 | continue; | |
1113 | rc = ap_init_queue(qid); | |
1114 | if (rc) | |
1115 | continue; | |
1116 | ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL); | |
1117 | if (!ap_dev) | |
1118 | break; | |
1119 | ap_dev->qid = qid; | |
1120 | ap_dev->queue_depth = queue_depth; | |
4e56296d | 1121 | ap_dev->unregistered = 1; |
1534c382 MS |
1122 | spin_lock_init(&ap_dev->lock); |
1123 | INIT_LIST_HEAD(&ap_dev->pendingq); | |
1124 | INIT_LIST_HEAD(&ap_dev->requestq); | |
cf352ce0 | 1125 | INIT_LIST_HEAD(&ap_dev->list); |
af512ed0 RW |
1126 | setup_timer(&ap_dev->timeout, ap_request_timeout, |
1127 | (unsigned long) ap_dev); | |
1534c382 MS |
1128 | if (device_type == 0) |
1129 | ap_probe_device_type(ap_dev); | |
1130 | else | |
1131 | ap_dev->device_type = device_type; | |
1132 | ||
1133 | ap_dev->device.bus = &ap_bus_type; | |
1134 | ap_dev->device.parent = ap_root_device; | |
edc44fa0 FB |
1135 | if (dev_set_name(&ap_dev->device, "card%02x", |
1136 | AP_QID_DEVICE(ap_dev->qid))) { | |
1137 | kfree(ap_dev); | |
1138 | continue; | |
1139 | } | |
1534c382 MS |
1140 | ap_dev->device.release = ap_device_release; |
1141 | rc = device_register(&ap_dev->device); | |
1142 | if (rc) { | |
c6304933 | 1143 | put_device(&ap_dev->device); |
1534c382 MS |
1144 | continue; |
1145 | } | |
1146 | /* Add device attributes. */ | |
1147 | rc = sysfs_create_group(&ap_dev->device.kobj, | |
1148 | &ap_dev_attr_group); | |
4e56296d RW |
1149 | if (!rc) { |
1150 | spin_lock_bh(&ap_dev->lock); | |
1151 | ap_dev->unregistered = 0; | |
1152 | spin_unlock_bh(&ap_dev->lock); | |
1153 | } | |
1154 | else | |
1534c382 MS |
1155 | device_unregister(&ap_dev->device); |
1156 | } | |
1157 | } | |
1158 | ||
1159 | static void | |
1160 | ap_config_timeout(unsigned long ptr) | |
1161 | { | |
1162 | queue_work(ap_work_queue, &ap_config_work); | |
1163 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1164 | add_timer(&ap_config_timer); | |
1165 | } | |
1166 | ||
1167 | /** | |
1749a81d FB |
1168 | * ap_schedule_poll_timer(): Schedule poll timer. |
1169 | * | |
1534c382 MS |
1170 | * Set up the timer to run the poll tasklet |
1171 | */ | |
1172 | static inline void ap_schedule_poll_timer(void) | |
1173 | { | |
8d406c6d | 1174 | ktime_t hr_time; |
93521314 FB |
1175 | |
1176 | spin_lock_bh(&ap_poll_timer_lock); | |
772f5472 | 1177 | if (ap_using_interrupts() || ap_suspend_flag) |
93521314 | 1178 | goto out; |
fe137230 | 1179 | if (hrtimer_is_queued(&ap_poll_timer)) |
93521314 | 1180 | goto out; |
8d406c6d FB |
1181 | if (ktime_to_ns(hrtimer_expires_remaining(&ap_poll_timer)) <= 0) { |
1182 | hr_time = ktime_set(0, poll_timeout); | |
1183 | hrtimer_forward_now(&ap_poll_timer, hr_time); | |
1184 | hrtimer_restart(&ap_poll_timer); | |
1185 | } | |
93521314 FB |
1186 | out: |
1187 | spin_unlock_bh(&ap_poll_timer_lock); | |
1534c382 MS |
1188 | } |
1189 | ||
1190 | /** | |
1749a81d | 1191 | * ap_poll_read(): Receive pending reply messages from an AP device. |
1534c382 MS |
1192 | * @ap_dev: pointer to the AP device |
1193 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1194 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1195 | * |
1534c382 MS |
1196 | * Returns 0 if the device is still present, -ENODEV if not. |
1197 | */ | |
4d284cac | 1198 | static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1199 | { |
1200 | struct ap_queue_status status; | |
1201 | struct ap_message *ap_msg; | |
1202 | ||
1203 | if (ap_dev->queue_count <= 0) | |
1204 | return 0; | |
1205 | status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid, | |
1206 | ap_dev->reply->message, ap_dev->reply->length); | |
1207 | switch (status.response_code) { | |
1208 | case AP_RESPONSE_NORMAL: | |
1209 | atomic_dec(&ap_poll_requests); | |
af512ed0 | 1210 | ap_decrease_queue_count(ap_dev); |
1534c382 MS |
1211 | list_for_each_entry(ap_msg, &ap_dev->pendingq, list) { |
1212 | if (ap_msg->psmid != ap_dev->reply->psmid) | |
1213 | continue; | |
1214 | list_del_init(&ap_msg->list); | |
1215 | ap_dev->pendingq_count--; | |
1216 | ap_dev->drv->receive(ap_dev, ap_msg, ap_dev->reply); | |
1217 | break; | |
1218 | } | |
1219 | if (ap_dev->queue_count > 0) | |
1220 | *flags |= 1; | |
1221 | break; | |
1222 | case AP_RESPONSE_NO_PENDING_REPLY: | |
1223 | if (status.queue_empty) { | |
1224 | /* The card shouldn't forget requests but who knows. */ | |
e675c0d2 | 1225 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); |
1534c382 MS |
1226 | ap_dev->queue_count = 0; |
1227 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1228 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1229 | ap_dev->pendingq_count = 0; | |
1230 | } else | |
1231 | *flags |= 2; | |
1232 | break; | |
1233 | default: | |
1234 | return -ENODEV; | |
1235 | } | |
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | /** | |
1749a81d | 1240 | * ap_poll_write(): Send messages from the request queue to an AP device. |
1534c382 MS |
1241 | * @ap_dev: pointer to the AP device |
1242 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1243 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1244 | * |
1534c382 MS |
1245 | * Returns 0 if the device is still present, -ENODEV if not. |
1246 | */ | |
4d284cac | 1247 | static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1248 | { |
1249 | struct ap_queue_status status; | |
1250 | struct ap_message *ap_msg; | |
1251 | ||
1252 | if (ap_dev->requestq_count <= 0 || | |
1253 | ap_dev->queue_count >= ap_dev->queue_depth) | |
1254 | return 0; | |
1255 | /* Start the next request on the queue. */ | |
1256 | ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list); | |
1257 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
a6a5d73a | 1258 | ap_msg->message, ap_msg->length, ap_msg->special); |
1534c382 MS |
1259 | switch (status.response_code) { |
1260 | case AP_RESPONSE_NORMAL: | |
1261 | atomic_inc(&ap_poll_requests); | |
af512ed0 | 1262 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1263 | list_move_tail(&ap_msg->list, &ap_dev->pendingq); |
1264 | ap_dev->requestq_count--; | |
1265 | ap_dev->pendingq_count++; | |
1266 | if (ap_dev->queue_count < ap_dev->queue_depth && | |
1267 | ap_dev->requestq_count > 0) | |
1268 | *flags |= 1; | |
1269 | *flags |= 2; | |
1270 | break; | |
1271 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1272 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1273 | *flags |= 2; |
1274 | break; | |
1275 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
a6a5d73a | 1276 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
1534c382 MS |
1277 | return -EINVAL; |
1278 | default: | |
1279 | return -ENODEV; | |
1280 | } | |
1281 | return 0; | |
1282 | } | |
1283 | ||
1284 | /** | |
1749a81d | 1285 | * ap_poll_queue(): Poll AP device for pending replies and send new messages. |
1534c382 MS |
1286 | * @ap_dev: pointer to the bus device |
1287 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1288 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d FB |
1289 | * |
1290 | * Poll AP device for pending replies and send new messages. If either | |
1291 | * ap_poll_read or ap_poll_write returns -ENODEV unregister the device. | |
1534c382 MS |
1292 | * Returns 0. |
1293 | */ | |
1294 | static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags) | |
1295 | { | |
1296 | int rc; | |
1297 | ||
1298 | rc = ap_poll_read(ap_dev, flags); | |
1299 | if (rc) | |
1300 | return rc; | |
1301 | return ap_poll_write(ap_dev, flags); | |
1302 | } | |
1303 | ||
1304 | /** | |
1749a81d | 1305 | * __ap_queue_message(): Queue a message to a device. |
1534c382 MS |
1306 | * @ap_dev: pointer to the AP device |
1307 | * @ap_msg: the message to be queued | |
1749a81d FB |
1308 | * |
1309 | * Queue a message to a device. Returns 0 if successful. | |
1534c382 MS |
1310 | */ |
1311 | static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1312 | { | |
1313 | struct ap_queue_status status; | |
1314 | ||
1315 | if (list_empty(&ap_dev->requestq) && | |
1316 | ap_dev->queue_count < ap_dev->queue_depth) { | |
1317 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
a6a5d73a FB |
1318 | ap_msg->message, ap_msg->length, |
1319 | ap_msg->special); | |
1534c382 MS |
1320 | switch (status.response_code) { |
1321 | case AP_RESPONSE_NORMAL: | |
1322 | list_add_tail(&ap_msg->list, &ap_dev->pendingq); | |
1323 | atomic_inc(&ap_poll_requests); | |
1324 | ap_dev->pendingq_count++; | |
af512ed0 | 1325 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1326 | ap_dev->total_request_count++; |
1327 | break; | |
1328 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1329 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1330 | list_add_tail(&ap_msg->list, &ap_dev->requestq); |
1331 | ap_dev->requestq_count++; | |
1332 | ap_dev->total_request_count++; | |
1333 | return -EBUSY; | |
a6a5d73a | 1334 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
1534c382 MS |
1335 | case AP_RESPONSE_MESSAGE_TOO_BIG: |
1336 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL)); | |
1337 | return -EINVAL; | |
1338 | default: /* Device is gone. */ | |
1339 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
1340 | return -ENODEV; | |
1341 | } | |
1342 | } else { | |
1343 | list_add_tail(&ap_msg->list, &ap_dev->requestq); | |
1344 | ap_dev->requestq_count++; | |
1345 | ap_dev->total_request_count++; | |
1346 | return -EBUSY; | |
1347 | } | |
1348 | ap_schedule_poll_timer(); | |
1349 | return 0; | |
1350 | } | |
1351 | ||
1352 | void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1353 | { | |
1354 | unsigned long flags; | |
1355 | int rc; | |
1356 | ||
1357 | spin_lock_bh(&ap_dev->lock); | |
1358 | if (!ap_dev->unregistered) { | |
1359 | /* Make room on the queue by polling for finished requests. */ | |
1360 | rc = ap_poll_queue(ap_dev, &flags); | |
1361 | if (!rc) | |
1362 | rc = __ap_queue_message(ap_dev, ap_msg); | |
1363 | if (!rc) | |
1364 | wake_up(&ap_poll_wait); | |
4e56296d RW |
1365 | if (rc == -ENODEV) |
1366 | ap_dev->unregistered = 1; | |
1534c382 MS |
1367 | } else { |
1368 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
c6a48264 | 1369 | rc = -ENODEV; |
1534c382 MS |
1370 | } |
1371 | spin_unlock_bh(&ap_dev->lock); | |
1372 | if (rc == -ENODEV) | |
1373 | device_unregister(&ap_dev->device); | |
1374 | } | |
1375 | EXPORT_SYMBOL(ap_queue_message); | |
1376 | ||
1377 | /** | |
1749a81d FB |
1378 | * ap_cancel_message(): Cancel a crypto request. |
1379 | * @ap_dev: The AP device that has the message queued | |
1380 | * @ap_msg: The message that is to be removed | |
1381 | * | |
1534c382 | 1382 | * Cancel a crypto request. This is done by removing the request |
1749a81d | 1383 | * from the device pending or request queue. Note that the |
1534c382 MS |
1384 | * request stays on the AP queue. When it finishes the message |
1385 | * reply will be discarded because the psmid can't be found. | |
1534c382 MS |
1386 | */ |
1387 | void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1388 | { | |
1389 | struct ap_message *tmp; | |
1390 | ||
1391 | spin_lock_bh(&ap_dev->lock); | |
1392 | if (!list_empty(&ap_msg->list)) { | |
1393 | list_for_each_entry(tmp, &ap_dev->pendingq, list) | |
1394 | if (tmp->psmid == ap_msg->psmid) { | |
1395 | ap_dev->pendingq_count--; | |
1396 | goto found; | |
1397 | } | |
1398 | ap_dev->requestq_count--; | |
1399 | found: | |
1400 | list_del_init(&ap_msg->list); | |
1401 | } | |
1402 | spin_unlock_bh(&ap_dev->lock); | |
1403 | } | |
1404 | EXPORT_SYMBOL(ap_cancel_message); | |
1405 | ||
1406 | /** | |
1749a81d | 1407 | * ap_poll_timeout(): AP receive polling for finished AP requests. |
fe137230 | 1408 | * @unused: Unused pointer. |
1749a81d | 1409 | * |
fe137230 | 1410 | * Schedules the AP tasklet using a high resolution timer. |
1534c382 | 1411 | */ |
fe137230 | 1412 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) |
1534c382 MS |
1413 | { |
1414 | tasklet_schedule(&ap_tasklet); | |
fe137230 | 1415 | return HRTIMER_NORESTART; |
1534c382 MS |
1416 | } |
1417 | ||
af512ed0 | 1418 | /** |
1749a81d FB |
1419 | * ap_reset(): Reset a not responding AP device. |
1420 | * @ap_dev: Pointer to the AP device | |
1421 | * | |
af512ed0 RW |
1422 | * Reset a not responding AP device and move all requests from the |
1423 | * pending queue to the request queue. | |
1424 | */ | |
1425 | static void ap_reset(struct ap_device *ap_dev) | |
1426 | { | |
1427 | int rc; | |
1428 | ||
1429 | ap_dev->reset = AP_RESET_IGNORE; | |
1430 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
1431 | ap_dev->queue_count = 0; | |
1432 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1433 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1434 | ap_dev->pendingq_count = 0; | |
1435 | rc = ap_init_queue(ap_dev->qid); | |
1436 | if (rc == -ENODEV) | |
1437 | ap_dev->unregistered = 1; | |
1438 | } | |
1439 | ||
43c207e6 | 1440 | static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 | 1441 | { |
1534c382 | 1442 | if (!ap_dev->unregistered) { |
c6a48264 | 1443 | if (ap_poll_queue(ap_dev, flags)) |
4e56296d | 1444 | ap_dev->unregistered = 1; |
af512ed0 RW |
1445 | if (ap_dev->reset == AP_RESET_DO) |
1446 | ap_reset(ap_dev); | |
c6a48264 | 1447 | } |
1534c382 MS |
1448 | return 0; |
1449 | } | |
1450 | ||
1749a81d FB |
1451 | /** |
1452 | * ap_poll_all(): Poll all AP devices. | |
1453 | * @dummy: Unused variable | |
1454 | * | |
1455 | * Poll all AP devices on the bus in a round robin fashion. Continue | |
1456 | * polling until bit 2^0 of the control flags is not set. If bit 2^1 | |
1457 | * of the control flags has been set arm the poll timer. | |
1458 | */ | |
1534c382 MS |
1459 | static void ap_poll_all(unsigned long dummy) |
1460 | { | |
1461 | unsigned long flags; | |
cf352ce0 | 1462 | struct ap_device *ap_dev; |
1534c382 | 1463 | |
cb17a636 FB |
1464 | /* Reset the indicator if interrupts are used. Thus new interrupts can |
1465 | * be received. Doing it in the beginning of the tasklet is therefor | |
1466 | * important that no requests on any AP get lost. | |
1467 | */ | |
1468 | if (ap_using_interrupts()) | |
1469 | xchg((u8 *)ap_interrupt_indicator, 0); | |
1534c382 MS |
1470 | do { |
1471 | flags = 0; | |
43c207e6 | 1472 | spin_lock(&ap_device_list_lock); |
cf352ce0 | 1473 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
95f1556c | 1474 | spin_lock(&ap_dev->lock); |
43c207e6 | 1475 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 1476 | spin_unlock(&ap_dev->lock); |
cf352ce0 | 1477 | } |
43c207e6 | 1478 | spin_unlock(&ap_device_list_lock); |
1534c382 MS |
1479 | } while (flags & 1); |
1480 | if (flags & 2) | |
1481 | ap_schedule_poll_timer(); | |
1482 | } | |
1483 | ||
1484 | /** | |
1749a81d FB |
1485 | * ap_poll_thread(): Thread that polls for finished requests. |
1486 | * @data: Unused pointer | |
1487 | * | |
1534c382 MS |
1488 | * AP bus poll thread. The purpose of this thread is to poll for |
1489 | * finished requests in a loop if there is a "free" cpu - that is | |
1490 | * a cpu that doesn't have anything better to do. The polling stops | |
1491 | * as soon as there is another task or if all messages have been | |
1492 | * delivered. | |
1493 | */ | |
1494 | static int ap_poll_thread(void *data) | |
1495 | { | |
1496 | DECLARE_WAITQUEUE(wait, current); | |
1497 | unsigned long flags; | |
1498 | int requests; | |
cf352ce0 | 1499 | struct ap_device *ap_dev; |
1534c382 | 1500 | |
d83682b3 | 1501 | set_user_nice(current, 19); |
1534c382 | 1502 | while (1) { |
772f5472 FB |
1503 | if (ap_suspend_flag) |
1504 | return 0; | |
1534c382 MS |
1505 | if (need_resched()) { |
1506 | schedule(); | |
1507 | continue; | |
1508 | } | |
1509 | add_wait_queue(&ap_poll_wait, &wait); | |
1510 | set_current_state(TASK_INTERRUPTIBLE); | |
1511 | if (kthread_should_stop()) | |
1512 | break; | |
1513 | requests = atomic_read(&ap_poll_requests); | |
1514 | if (requests <= 0) | |
1515 | schedule(); | |
1516 | set_current_state(TASK_RUNNING); | |
1517 | remove_wait_queue(&ap_poll_wait, &wait); | |
1518 | ||
1534c382 | 1519 | flags = 0; |
43c207e6 | 1520 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 1521 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
95f1556c | 1522 | spin_lock(&ap_dev->lock); |
43c207e6 | 1523 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 1524 | spin_unlock(&ap_dev->lock); |
cf352ce0 | 1525 | } |
43c207e6 | 1526 | spin_unlock_bh(&ap_device_list_lock); |
1534c382 MS |
1527 | } |
1528 | set_current_state(TASK_RUNNING); | |
1529 | remove_wait_queue(&ap_poll_wait, &wait); | |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | static int ap_poll_thread_start(void) | |
1534 | { | |
1535 | int rc; | |
1536 | ||
772f5472 | 1537 | if (ap_using_interrupts() || ap_suspend_flag) |
cb17a636 | 1538 | return 0; |
1534c382 MS |
1539 | mutex_lock(&ap_poll_thread_mutex); |
1540 | if (!ap_poll_kthread) { | |
1541 | ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); | |
1542 | rc = IS_ERR(ap_poll_kthread) ? PTR_ERR(ap_poll_kthread) : 0; | |
1543 | if (rc) | |
1544 | ap_poll_kthread = NULL; | |
1545 | } | |
1546 | else | |
1547 | rc = 0; | |
1548 | mutex_unlock(&ap_poll_thread_mutex); | |
1549 | return rc; | |
1550 | } | |
1551 | ||
1552 | static void ap_poll_thread_stop(void) | |
1553 | { | |
1554 | mutex_lock(&ap_poll_thread_mutex); | |
1555 | if (ap_poll_kthread) { | |
1556 | kthread_stop(ap_poll_kthread); | |
1557 | ap_poll_kthread = NULL; | |
1558 | } | |
1559 | mutex_unlock(&ap_poll_thread_mutex); | |
1560 | } | |
1561 | ||
af512ed0 | 1562 | /** |
1749a81d FB |
1563 | * ap_request_timeout(): Handling of request timeouts |
1564 | * @data: Holds the AP device. | |
1565 | * | |
1566 | * Handles request timeouts. | |
af512ed0 RW |
1567 | */ |
1568 | static void ap_request_timeout(unsigned long data) | |
1569 | { | |
1570 | struct ap_device *ap_dev = (struct ap_device *) data; | |
1571 | ||
cb17a636 | 1572 | if (ap_dev->reset == AP_RESET_ARMED) { |
af512ed0 | 1573 | ap_dev->reset = AP_RESET_DO; |
cb17a636 FB |
1574 | |
1575 | if (ap_using_interrupts()) | |
1576 | tasklet_schedule(&ap_tasklet); | |
1577 | } | |
af512ed0 RW |
1578 | } |
1579 | ||
13e742ba RW |
1580 | static void ap_reset_domain(void) |
1581 | { | |
1582 | int i; | |
1583 | ||
39aa7cf6 RW |
1584 | if (ap_domain_index != -1) |
1585 | for (i = 0; i < AP_DEVICES; i++) | |
1586 | ap_reset_queue(AP_MKQID(i, ap_domain_index)); | |
13e742ba RW |
1587 | } |
1588 | ||
1589 | static void ap_reset_all(void) | |
85eca850 RW |
1590 | { |
1591 | int i, j; | |
1592 | ||
1593 | for (i = 0; i < AP_DOMAINS; i++) | |
1594 | for (j = 0; j < AP_DEVICES; j++) | |
1595 | ap_reset_queue(AP_MKQID(j, i)); | |
1596 | } | |
1597 | ||
1598 | static struct reset_call ap_reset_call = { | |
13e742ba | 1599 | .fn = ap_reset_all, |
85eca850 RW |
1600 | }; |
1601 | ||
1534c382 | 1602 | /** |
1749a81d FB |
1603 | * ap_module_init(): The module initialization code. |
1604 | * | |
1605 | * Initializes the module. | |
1534c382 MS |
1606 | */ |
1607 | int __init ap_module_init(void) | |
1608 | { | |
1609 | int rc, i; | |
1610 | ||
1611 | if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) { | |
136f7a1c MS |
1612 | pr_warning("%d is not a valid cryptographic domain\n", |
1613 | ap_domain_index); | |
1534c382 MS |
1614 | return -EINVAL; |
1615 | } | |
5314af69 FB |
1616 | /* In resume callback we need to know if the user had set the domain. |
1617 | * If so, we can not just reset it. | |
1618 | */ | |
1619 | if (ap_domain_index >= 0) | |
1620 | user_set_domain = 1; | |
1621 | ||
1534c382 | 1622 | if (ap_instructions_available() != 0) { |
136f7a1c MS |
1623 | pr_warning("The hardware system does not support " |
1624 | "AP instructions\n"); | |
1534c382 MS |
1625 | return -ENODEV; |
1626 | } | |
cb17a636 FB |
1627 | if (ap_interrupts_available()) { |
1628 | isc_register(AP_ISC); | |
1629 | ap_interrupt_indicator = s390_register_adapter_interrupt( | |
1630 | &ap_interrupt_handler, NULL, AP_ISC); | |
1631 | if (IS_ERR(ap_interrupt_indicator)) { | |
1632 | ap_interrupt_indicator = NULL; | |
1633 | isc_unregister(AP_ISC); | |
1634 | } | |
1635 | } | |
1636 | ||
85eca850 | 1637 | register_reset_call(&ap_reset_call); |
1534c382 MS |
1638 | |
1639 | /* Create /sys/bus/ap. */ | |
1640 | rc = bus_register(&ap_bus_type); | |
1641 | if (rc) | |
1642 | goto out; | |
1643 | for (i = 0; ap_bus_attrs[i]; i++) { | |
1644 | rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); | |
1645 | if (rc) | |
1646 | goto out_bus; | |
1647 | } | |
1648 | ||
1649 | /* Create /sys/devices/ap. */ | |
035da16f | 1650 | ap_root_device = root_device_register("ap"); |
1534c382 MS |
1651 | rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0; |
1652 | if (rc) | |
1653 | goto out_bus; | |
1654 | ||
1655 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
1656 | if (!ap_work_queue) { | |
1657 | rc = -ENOMEM; | |
1658 | goto out_root; | |
1659 | } | |
1660 | ||
1661 | if (ap_select_domain() == 0) | |
1662 | ap_scan_bus(NULL); | |
1663 | ||
1749a81d | 1664 | /* Setup the AP bus rescan timer. */ |
1534c382 MS |
1665 | init_timer(&ap_config_timer); |
1666 | ap_config_timer.function = ap_config_timeout; | |
1667 | ap_config_timer.data = 0; | |
1668 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1669 | add_timer(&ap_config_timer); | |
1670 | ||
fe137230 FB |
1671 | /* Setup the high resultion poll timer. |
1672 | * If we are running under z/VM adjust polling to z/VM polling rate. | |
1673 | */ | |
1674 | if (MACHINE_IS_VM) | |
1675 | poll_timeout = 1500000; | |
93521314 | 1676 | spin_lock_init(&ap_poll_timer_lock); |
fe137230 FB |
1677 | hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
1678 | ap_poll_timer.function = ap_poll_timeout; | |
1679 | ||
1534c382 MS |
1680 | /* Start the low priority AP bus poll thread. */ |
1681 | if (ap_thread_flag) { | |
1682 | rc = ap_poll_thread_start(); | |
1683 | if (rc) | |
1684 | goto out_work; | |
1685 | } | |
1686 | ||
1687 | return 0; | |
1688 | ||
1689 | out_work: | |
1690 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1691 | hrtimer_cancel(&ap_poll_timer); |
1534c382 MS |
1692 | destroy_workqueue(ap_work_queue); |
1693 | out_root: | |
035da16f | 1694 | root_device_unregister(ap_root_device); |
1534c382 MS |
1695 | out_bus: |
1696 | while (i--) | |
1697 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1698 | bus_unregister(&ap_bus_type); | |
1699 | out: | |
85eca850 | 1700 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1701 | if (ap_using_interrupts()) { |
1702 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1703 | isc_unregister(AP_ISC); | |
1704 | } | |
1534c382 MS |
1705 | return rc; |
1706 | } | |
1707 | ||
1708 | static int __ap_match_all(struct device *dev, void *data) | |
1709 | { | |
1710 | return 1; | |
1711 | } | |
1712 | ||
1713 | /** | |
1749a81d FB |
1714 | * ap_modules_exit(): The module termination code |
1715 | * | |
1716 | * Terminates the module. | |
1534c382 MS |
1717 | */ |
1718 | void ap_module_exit(void) | |
1719 | { | |
1720 | int i; | |
1721 | struct device *dev; | |
1722 | ||
13e742ba | 1723 | ap_reset_domain(); |
1534c382 MS |
1724 | ap_poll_thread_stop(); |
1725 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1726 | hrtimer_cancel(&ap_poll_timer); |
1534c382 | 1727 | destroy_workqueue(ap_work_queue); |
13e742ba | 1728 | tasklet_kill(&ap_tasklet); |
035da16f | 1729 | root_device_unregister(ap_root_device); |
1534c382 MS |
1730 | while ((dev = bus_find_device(&ap_bus_type, NULL, NULL, |
1731 | __ap_match_all))) | |
1732 | { | |
1733 | device_unregister(dev); | |
1734 | put_device(dev); | |
1735 | } | |
1736 | for (i = 0; ap_bus_attrs[i]; i++) | |
1737 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1738 | bus_unregister(&ap_bus_type); | |
85eca850 | 1739 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1740 | if (ap_using_interrupts()) { |
1741 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1742 | isc_unregister(AP_ISC); | |
1743 | } | |
1534c382 MS |
1744 | } |
1745 | ||
1746 | #ifndef CONFIG_ZCRYPT_MONOLITHIC | |
1747 | module_init(ap_module_init); | |
1748 | module_exit(ap_module_exit); | |
1749 | #endif |