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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); | |
1534c382 | 63 | |
1749a81d | 64 | /* |
1534c382 MS |
65 | * Module description. |
66 | */ | |
67 | MODULE_AUTHOR("IBM Corporation"); | |
68 | MODULE_DESCRIPTION("Adjunct Processor Bus driver, " | |
69 | "Copyright 2006 IBM Corporation"); | |
70 | MODULE_LICENSE("GPL"); | |
71 | ||
1749a81d | 72 | /* |
1534c382 MS |
73 | * Module parameter |
74 | */ | |
75 | int ap_domain_index = -1; /* Adjunct Processor Domain Index */ | |
76 | module_param_named(domain, ap_domain_index, int, 0000); | |
77 | MODULE_PARM_DESC(domain, "domain index for ap devices"); | |
78 | EXPORT_SYMBOL(ap_domain_index); | |
79 | ||
b90b34c6 | 80 | static int ap_thread_flag = 0; |
1534c382 | 81 | module_param_named(poll_thread, ap_thread_flag, int, 0000); |
b90b34c6 | 82 | MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); |
1534c382 MS |
83 | |
84 | static struct device *ap_root_device = NULL; | |
43c207e6 | 85 | static DEFINE_SPINLOCK(ap_device_list_lock); |
cf352ce0 | 86 | static LIST_HEAD(ap_device_list); |
1534c382 | 87 | |
1749a81d | 88 | /* |
1534c382 MS |
89 | * Workqueue & timer for bus rescan. |
90 | */ | |
91 | static struct workqueue_struct *ap_work_queue; | |
92 | static struct timer_list ap_config_timer; | |
93 | static int ap_config_time = AP_CONFIG_TIME; | |
4927b3f7 | 94 | static DECLARE_WORK(ap_config_work, ap_scan_bus); |
1534c382 | 95 | |
1749a81d | 96 | /* |
cb17a636 | 97 | * Tasklet & timer for AP request polling and interrupts |
1534c382 | 98 | */ |
1534c382 MS |
99 | static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0); |
100 | static atomic_t ap_poll_requests = ATOMIC_INIT(0); | |
101 | static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); | |
102 | static struct task_struct *ap_poll_kthread = NULL; | |
103 | static DEFINE_MUTEX(ap_poll_thread_mutex); | |
cb17a636 | 104 | static void *ap_interrupt_indicator; |
fe137230 FB |
105 | static struct hrtimer ap_poll_timer; |
106 | /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. | |
107 | * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ | |
108 | static unsigned long long poll_timeout = 250000; | |
1534c382 | 109 | |
772f5472 FB |
110 | /* Suspend flag */ |
111 | static int ap_suspend_flag; | |
112 | static struct bus_type ap_bus_type; | |
113 | ||
cb17a636 FB |
114 | /** |
115 | * ap_using_interrupts() - Returns non-zero if interrupt support is | |
116 | * available. | |
117 | */ | |
118 | static inline int ap_using_interrupts(void) | |
119 | { | |
120 | return ap_interrupt_indicator != NULL; | |
121 | } | |
122 | ||
1534c382 | 123 | /** |
1749a81d | 124 | * ap_intructions_available() - Test if AP instructions are available. |
1534c382 | 125 | * |
1749a81d | 126 | * Returns 0 if the AP instructions are installed. |
1534c382 MS |
127 | */ |
128 | static inline int ap_instructions_available(void) | |
129 | { | |
130 | register unsigned long reg0 asm ("0") = AP_MKQID(0,0); | |
131 | register unsigned long reg1 asm ("1") = -ENODEV; | |
132 | register unsigned long reg2 asm ("2") = 0UL; | |
133 | ||
134 | asm volatile( | |
135 | " .long 0xb2af0000\n" /* PQAP(TAPQ) */ | |
136 | "0: la %1,0\n" | |
137 | "1:\n" | |
138 | EX_TABLE(0b, 1b) | |
139 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" ); | |
140 | return reg1; | |
141 | } | |
142 | ||
cb17a636 FB |
143 | /** |
144 | * ap_interrupts_available(): Test if AP interrupts are available. | |
145 | * | |
146 | * Returns 1 if AP interrupts are available. | |
147 | */ | |
148 | static int ap_interrupts_available(void) | |
149 | { | |
150 | unsigned long long facility_bits[2]; | |
151 | ||
152 | if (stfle(facility_bits, 2) <= 1) | |
153 | return 0; | |
154 | if (!(facility_bits[0] & (1ULL << 61)) || | |
155 | !(facility_bits[1] & (1ULL << 62))) | |
156 | return 0; | |
157 | return 1; | |
158 | } | |
159 | ||
1534c382 | 160 | /** |
1749a81d FB |
161 | * ap_test_queue(): Test adjunct processor queue. |
162 | * @qid: The AP queue number | |
163 | * @queue_depth: Pointer to queue depth value | |
164 | * @device_type: Pointer to device type value | |
1534c382 | 165 | * |
1749a81d | 166 | * Returns AP queue status structure. |
1534c382 MS |
167 | */ |
168 | static inline struct ap_queue_status | |
169 | ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
170 | { | |
171 | register unsigned long reg0 asm ("0") = qid; | |
172 | register struct ap_queue_status reg1 asm ("1"); | |
173 | register unsigned long reg2 asm ("2") = 0UL; | |
174 | ||
175 | asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */ | |
176 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
177 | *device_type = (int) (reg2 >> 24); | |
178 | *queue_depth = (int) (reg2 & 0xff); | |
179 | return reg1; | |
180 | } | |
181 | ||
182 | /** | |
1749a81d FB |
183 | * ap_reset_queue(): Reset adjunct processor queue. |
184 | * @qid: The AP queue number | |
1534c382 | 185 | * |
1749a81d | 186 | * Returns AP queue status structure. |
1534c382 MS |
187 | */ |
188 | static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) | |
189 | { | |
190 | register unsigned long reg0 asm ("0") = qid | 0x01000000UL; | |
191 | register struct ap_queue_status reg1 asm ("1"); | |
192 | register unsigned long reg2 asm ("2") = 0UL; | |
193 | ||
194 | asm volatile( | |
195 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
196 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
197 | return reg1; | |
198 | } | |
199 | ||
cb17a636 FB |
200 | #ifdef CONFIG_64BIT |
201 | /** | |
202 | * ap_queue_interruption_control(): Enable interruption for a specific AP. | |
203 | * @qid: The AP queue number | |
204 | * @ind: The notification indicator byte | |
205 | * | |
206 | * Returns AP queue status. | |
207 | */ | |
208 | static inline struct ap_queue_status | |
209 | ap_queue_interruption_control(ap_qid_t qid, void *ind) | |
210 | { | |
211 | register unsigned long reg0 asm ("0") = qid | 0x03000000UL; | |
212 | register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC; | |
213 | register struct ap_queue_status reg1_out asm ("1"); | |
214 | register void *reg2 asm ("2") = ind; | |
215 | asm volatile( | |
216 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
217 | : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) | |
218 | : | |
219 | : "cc" ); | |
220 | return reg1_out; | |
221 | } | |
222 | #endif | |
223 | ||
224 | /** | |
225 | * ap_queue_enable_interruption(): Enable interruption on an AP. | |
226 | * @qid: The AP queue number | |
227 | * @ind: the notification indicator byte | |
228 | * | |
229 | * Enables interruption on AP queue via ap_queue_interruption_control(). Based | |
230 | * on the return value it waits a while and tests the AP queue if interrupts | |
231 | * have been switched on using ap_test_queue(). | |
232 | */ | |
233 | static int ap_queue_enable_interruption(ap_qid_t qid, void *ind) | |
234 | { | |
235 | #ifdef CONFIG_64BIT | |
236 | struct ap_queue_status status; | |
237 | int t_depth, t_device_type, rc, i; | |
238 | ||
239 | rc = -EBUSY; | |
240 | status = ap_queue_interruption_control(qid, ind); | |
241 | ||
242 | for (i = 0; i < AP_MAX_RESET; i++) { | |
243 | switch (status.response_code) { | |
244 | case AP_RESPONSE_NORMAL: | |
245 | if (status.int_enabled) | |
246 | return 0; | |
247 | break; | |
248 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
249 | case AP_RESPONSE_BUSY: | |
250 | break; | |
251 | case AP_RESPONSE_Q_NOT_AVAIL: | |
252 | case AP_RESPONSE_DECONFIGURED: | |
253 | case AP_RESPONSE_CHECKSTOPPED: | |
254 | case AP_RESPONSE_INVALID_ADDRESS: | |
255 | return -ENODEV; | |
256 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
257 | if (status.int_enabled) | |
258 | return 0; | |
259 | break; | |
260 | default: | |
261 | break; | |
262 | } | |
263 | if (i < AP_MAX_RESET - 1) { | |
264 | udelay(5); | |
265 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
266 | } | |
267 | } | |
268 | return rc; | |
269 | #else | |
270 | return -EINVAL; | |
271 | #endif | |
272 | } | |
273 | ||
1534c382 | 274 | /** |
1749a81d FB |
275 | * __ap_send(): Send message to adjunct processor queue. |
276 | * @qid: The AP queue number | |
277 | * @psmid: The program supplied message identifier | |
278 | * @msg: The message text | |
279 | * @length: The message length | |
1534c382 | 280 | * |
1749a81d | 281 | * Returns AP queue status structure. |
1534c382 | 282 | * Condition code 1 on NQAP can't happen because the L bit is 1. |
1534c382 MS |
283 | * Condition code 2 on NQAP also means the send is incomplete, |
284 | * because a segment boundary was reached. The NQAP is repeated. | |
285 | */ | |
286 | static inline struct ap_queue_status | |
287 | __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
288 | { | |
289 | typedef struct { char _[length]; } msgblock; | |
290 | register unsigned long reg0 asm ("0") = qid | 0x40000000UL; | |
291 | register struct ap_queue_status reg1 asm ("1"); | |
292 | register unsigned long reg2 asm ("2") = (unsigned long) msg; | |
293 | register unsigned long reg3 asm ("3") = (unsigned long) length; | |
294 | register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32); | |
295 | register unsigned long reg5 asm ("5") = (unsigned int) psmid; | |
296 | ||
297 | asm volatile ( | |
298 | "0: .long 0xb2ad0042\n" /* DQAP */ | |
299 | " brc 2,0b" | |
300 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) | |
301 | : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) | |
302 | : "cc" ); | |
303 | return reg1; | |
304 | } | |
305 | ||
306 | int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
307 | { | |
308 | struct ap_queue_status status; | |
309 | ||
310 | status = __ap_send(qid, psmid, msg, length); | |
311 | switch (status.response_code) { | |
312 | case AP_RESPONSE_NORMAL: | |
313 | return 0; | |
314 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 315 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
316 | return -EBUSY; |
317 | default: /* Device is gone. */ | |
318 | return -ENODEV; | |
319 | } | |
320 | } | |
321 | EXPORT_SYMBOL(ap_send); | |
322 | ||
1749a81d FB |
323 | /** |
324 | * __ap_recv(): Receive message from adjunct processor queue. | |
325 | * @qid: The AP queue number | |
326 | * @psmid: Pointer to program supplied message identifier | |
327 | * @msg: The message text | |
328 | * @length: The message length | |
1534c382 | 329 | * |
1749a81d | 330 | * Returns AP queue status structure. |
1534c382 MS |
331 | * Condition code 1 on DQAP means the receive has taken place |
332 | * but only partially. The response is incomplete, hence the | |
333 | * DQAP is repeated. | |
1534c382 MS |
334 | * Condition code 2 on DQAP also means the receive is incomplete, |
335 | * this time because a segment boundary was reached. Again, the | |
336 | * DQAP is repeated. | |
1534c382 MS |
337 | * Note that gpr2 is used by the DQAP instruction to keep track of |
338 | * any 'residual' length, in case the instruction gets interrupted. | |
339 | * Hence it gets zeroed before the instruction. | |
340 | */ | |
341 | static inline struct ap_queue_status | |
342 | __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
343 | { | |
344 | typedef struct { char _[length]; } msgblock; | |
345 | register unsigned long reg0 asm("0") = qid | 0x80000000UL; | |
346 | register struct ap_queue_status reg1 asm ("1"); | |
347 | register unsigned long reg2 asm("2") = 0UL; | |
348 | register unsigned long reg4 asm("4") = (unsigned long) msg; | |
349 | register unsigned long reg5 asm("5") = (unsigned long) length; | |
350 | register unsigned long reg6 asm("6") = 0UL; | |
351 | register unsigned long reg7 asm("7") = 0UL; | |
352 | ||
353 | ||
354 | asm volatile( | |
355 | "0: .long 0xb2ae0064\n" | |
356 | " brc 6,0b\n" | |
357 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), | |
358 | "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), | |
359 | "=m" (*(msgblock *) msg) : : "cc" ); | |
360 | *psmid = (((unsigned long long) reg6) << 32) + reg7; | |
361 | return reg1; | |
362 | } | |
363 | ||
364 | int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
365 | { | |
366 | struct ap_queue_status status; | |
367 | ||
368 | status = __ap_recv(qid, psmid, msg, length); | |
369 | switch (status.response_code) { | |
370 | case AP_RESPONSE_NORMAL: | |
371 | return 0; | |
372 | case AP_RESPONSE_NO_PENDING_REPLY: | |
373 | if (status.queue_empty) | |
374 | return -ENOENT; | |
375 | return -EBUSY; | |
af512ed0 RW |
376 | case AP_RESPONSE_RESET_IN_PROGRESS: |
377 | return -EBUSY; | |
1534c382 MS |
378 | default: |
379 | return -ENODEV; | |
380 | } | |
381 | } | |
382 | EXPORT_SYMBOL(ap_recv); | |
383 | ||
384 | /** | |
1749a81d FB |
385 | * ap_query_queue(): Check if an AP queue is available. |
386 | * @qid: The AP queue number | |
387 | * @queue_depth: Pointer to queue depth value | |
388 | * @device_type: Pointer to device type value | |
389 | * | |
390 | * The test is repeated for AP_MAX_RESET times. | |
1534c382 MS |
391 | */ |
392 | static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
393 | { | |
394 | struct ap_queue_status status; | |
395 | int t_depth, t_device_type, rc, i; | |
396 | ||
397 | rc = -EBUSY; | |
398 | for (i = 0; i < AP_MAX_RESET; i++) { | |
399 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
400 | switch (status.response_code) { | |
401 | case AP_RESPONSE_NORMAL: | |
402 | *queue_depth = t_depth + 1; | |
403 | *device_type = t_device_type; | |
404 | rc = 0; | |
405 | break; | |
406 | case AP_RESPONSE_Q_NOT_AVAIL: | |
407 | rc = -ENODEV; | |
408 | break; | |
409 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
410 | break; | |
411 | case AP_RESPONSE_DECONFIGURED: | |
412 | rc = -ENODEV; | |
413 | break; | |
414 | case AP_RESPONSE_CHECKSTOPPED: | |
415 | rc = -ENODEV; | |
416 | break; | |
cb17a636 FB |
417 | case AP_RESPONSE_INVALID_ADDRESS: |
418 | rc = -ENODEV; | |
419 | break; | |
420 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
421 | break; | |
1534c382 MS |
422 | case AP_RESPONSE_BUSY: |
423 | break; | |
424 | default: | |
425 | BUG(); | |
426 | } | |
427 | if (rc != -EBUSY) | |
428 | break; | |
429 | if (i < AP_MAX_RESET - 1) | |
430 | udelay(5); | |
431 | } | |
432 | return rc; | |
433 | } | |
434 | ||
435 | /** | |
1749a81d FB |
436 | * ap_init_queue(): Reset an AP queue. |
437 | * @qid: The AP queue number | |
438 | * | |
1534c382 | 439 | * Reset an AP queue and wait for it to become available again. |
1534c382 MS |
440 | */ |
441 | static int ap_init_queue(ap_qid_t qid) | |
442 | { | |
443 | struct ap_queue_status status; | |
444 | int rc, dummy, i; | |
445 | ||
446 | rc = -ENODEV; | |
447 | status = ap_reset_queue(qid); | |
448 | for (i = 0; i < AP_MAX_RESET; i++) { | |
449 | switch (status.response_code) { | |
450 | case AP_RESPONSE_NORMAL: | |
451 | if (status.queue_empty) | |
452 | rc = 0; | |
453 | break; | |
454 | case AP_RESPONSE_Q_NOT_AVAIL: | |
455 | case AP_RESPONSE_DECONFIGURED: | |
456 | case AP_RESPONSE_CHECKSTOPPED: | |
457 | i = AP_MAX_RESET; /* return with -ENODEV */ | |
458 | break; | |
459 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
af512ed0 | 460 | rc = -EBUSY; |
1534c382 MS |
461 | case AP_RESPONSE_BUSY: |
462 | default: | |
463 | break; | |
464 | } | |
af512ed0 | 465 | if (rc != -ENODEV && rc != -EBUSY) |
1534c382 MS |
466 | break; |
467 | if (i < AP_MAX_RESET - 1) { | |
468 | udelay(5); | |
469 | status = ap_test_queue(qid, &dummy, &dummy); | |
470 | } | |
471 | } | |
cb17a636 FB |
472 | if (rc == 0 && ap_using_interrupts()) { |
473 | rc = ap_queue_enable_interruption(qid, ap_interrupt_indicator); | |
474 | /* If interruption mode is supported by the machine, | |
475 | * but an AP can not be enabled for interruption then | |
476 | * the AP will be discarded. */ | |
477 | if (rc) | |
478 | pr_err("Registering adapter interrupts for " | |
479 | "AP %d failed\n", AP_QID_DEVICE(qid)); | |
480 | } | |
1534c382 MS |
481 | return rc; |
482 | } | |
483 | ||
af512ed0 | 484 | /** |
1749a81d FB |
485 | * ap_increase_queue_count(): Arm request timeout. |
486 | * @ap_dev: Pointer to an AP device. | |
487 | * | |
488 | * Arm request timeout if an AP device was idle and a new request is submitted. | |
af512ed0 RW |
489 | */ |
490 | static void ap_increase_queue_count(struct ap_device *ap_dev) | |
491 | { | |
492 | int timeout = ap_dev->drv->request_timeout; | |
493 | ||
494 | ap_dev->queue_count++; | |
495 | if (ap_dev->queue_count == 1) { | |
496 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
497 | ap_dev->reset = AP_RESET_ARMED; | |
498 | } | |
499 | } | |
500 | ||
501 | /** | |
1749a81d FB |
502 | * ap_decrease_queue_count(): Decrease queue count. |
503 | * @ap_dev: Pointer to an AP device. | |
504 | * | |
505 | * If AP device is still alive, re-schedule request timeout if there are still | |
af512ed0 RW |
506 | * pending requests. |
507 | */ | |
508 | static void ap_decrease_queue_count(struct ap_device *ap_dev) | |
509 | { | |
510 | int timeout = ap_dev->drv->request_timeout; | |
511 | ||
512 | ap_dev->queue_count--; | |
513 | if (ap_dev->queue_count > 0) | |
514 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
515 | else | |
1749a81d | 516 | /* |
af512ed0 RW |
517 | * The timeout timer should to be disabled now - since |
518 | * del_timer_sync() is very expensive, we just tell via the | |
519 | * reset flag to ignore the pending timeout timer. | |
520 | */ | |
521 | ap_dev->reset = AP_RESET_IGNORE; | |
522 | } | |
523 | ||
1749a81d | 524 | /* |
1534c382 MS |
525 | * AP device related attributes. |
526 | */ | |
527 | static ssize_t ap_hwtype_show(struct device *dev, | |
528 | struct device_attribute *attr, char *buf) | |
529 | { | |
530 | struct ap_device *ap_dev = to_ap_dev(dev); | |
531 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); | |
532 | } | |
1534c382 | 533 | |
43c207e6 | 534 | static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); |
1534c382 MS |
535 | static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr, |
536 | char *buf) | |
537 | { | |
538 | struct ap_device *ap_dev = to_ap_dev(dev); | |
539 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth); | |
540 | } | |
1534c382 | 541 | |
43c207e6 | 542 | static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); |
1534c382 MS |
543 | static ssize_t ap_request_count_show(struct device *dev, |
544 | struct device_attribute *attr, | |
545 | char *buf) | |
546 | { | |
547 | struct ap_device *ap_dev = to_ap_dev(dev); | |
548 | int rc; | |
549 | ||
550 | spin_lock_bh(&ap_dev->lock); | |
551 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count); | |
552 | spin_unlock_bh(&ap_dev->lock); | |
553 | return rc; | |
554 | } | |
555 | ||
556 | static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); | |
557 | ||
558 | static ssize_t ap_modalias_show(struct device *dev, | |
559 | struct device_attribute *attr, char *buf) | |
560 | { | |
561 | return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type); | |
562 | } | |
563 | ||
564 | static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); | |
565 | ||
566 | static struct attribute *ap_dev_attrs[] = { | |
567 | &dev_attr_hwtype.attr, | |
568 | &dev_attr_depth.attr, | |
569 | &dev_attr_request_count.attr, | |
570 | &dev_attr_modalias.attr, | |
571 | NULL | |
572 | }; | |
573 | static struct attribute_group ap_dev_attr_group = { | |
574 | .attrs = ap_dev_attrs | |
575 | }; | |
576 | ||
577 | /** | |
1749a81d FB |
578 | * ap_bus_match() |
579 | * @dev: Pointer to device | |
580 | * @drv: Pointer to device_driver | |
581 | * | |
1534c382 MS |
582 | * AP bus driver registration/unregistration. |
583 | */ | |
584 | static int ap_bus_match(struct device *dev, struct device_driver *drv) | |
585 | { | |
586 | struct ap_device *ap_dev = to_ap_dev(dev); | |
587 | struct ap_driver *ap_drv = to_ap_drv(drv); | |
588 | struct ap_device_id *id; | |
589 | ||
1749a81d | 590 | /* |
1534c382 MS |
591 | * Compare device type of the device with the list of |
592 | * supported types of the device_driver. | |
593 | */ | |
594 | for (id = ap_drv->ids; id->match_flags; id++) { | |
595 | if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) && | |
596 | (id->dev_type != ap_dev->device_type)) | |
597 | continue; | |
598 | return 1; | |
599 | } | |
600 | return 0; | |
601 | } | |
602 | ||
603 | /** | |
1749a81d FB |
604 | * ap_uevent(): Uevent function for AP devices. |
605 | * @dev: Pointer to device | |
606 | * @env: Pointer to kobj_uevent_env | |
607 | * | |
608 | * It sets up a single environment variable DEV_TYPE which contains the | |
609 | * hardware device type. | |
1534c382 | 610 | */ |
7eff2e7a | 611 | static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) |
1534c382 MS |
612 | { |
613 | struct ap_device *ap_dev = to_ap_dev(dev); | |
7eff2e7a | 614 | int retval = 0; |
1534c382 MS |
615 | |
616 | if (!ap_dev) | |
617 | return -ENODEV; | |
618 | ||
619 | /* Set up DEV_TYPE environment variable. */ | |
7eff2e7a | 620 | retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); |
bf62456e ER |
621 | if (retval) |
622 | return retval; | |
623 | ||
66a4263b | 624 | /* Add MODALIAS= */ |
7eff2e7a | 625 | retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); |
bf62456e | 626 | |
bf62456e | 627 | return retval; |
1534c382 MS |
628 | } |
629 | ||
772f5472 FB |
630 | static int ap_bus_suspend(struct device *dev, pm_message_t state) |
631 | { | |
632 | struct ap_device *ap_dev = to_ap_dev(dev); | |
633 | unsigned long flags; | |
634 | ||
635 | if (!ap_suspend_flag) { | |
636 | ap_suspend_flag = 1; | |
637 | ||
638 | /* Disable scanning for devices, thus we do not want to scan | |
639 | * for them after removing. | |
640 | */ | |
641 | del_timer_sync(&ap_config_timer); | |
642 | if (ap_work_queue != NULL) { | |
643 | destroy_workqueue(ap_work_queue); | |
644 | ap_work_queue = NULL; | |
645 | } | |
646 | tasklet_disable(&ap_tasklet); | |
647 | } | |
648 | /* Poll on the device until all requests are finished. */ | |
649 | do { | |
650 | flags = 0; | |
651 | __ap_poll_device(ap_dev, &flags); | |
652 | } while ((flags & 1) || (flags & 2)); | |
653 | ||
654 | ap_device_remove(dev); | |
655 | return 0; | |
656 | } | |
657 | ||
658 | static int ap_bus_resume(struct device *dev) | |
659 | { | |
660 | int rc = 0; | |
661 | struct ap_device *ap_dev = to_ap_dev(dev); | |
662 | ||
663 | if (ap_suspend_flag) { | |
664 | ap_suspend_flag = 0; | |
665 | if (!ap_interrupts_available()) | |
666 | ap_interrupt_indicator = NULL; | |
667 | ap_device_probe(dev); | |
668 | ap_reset(ap_dev); | |
669 | setup_timer(&ap_dev->timeout, ap_request_timeout, | |
670 | (unsigned long) ap_dev); | |
671 | ap_scan_bus(NULL); | |
672 | init_timer(&ap_config_timer); | |
673 | ap_config_timer.function = ap_config_timeout; | |
674 | ap_config_timer.data = 0; | |
675 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
676 | add_timer(&ap_config_timer); | |
677 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
678 | if (!ap_work_queue) | |
679 | return -ENOMEM; | |
680 | tasklet_enable(&ap_tasklet); | |
681 | if (!ap_using_interrupts()) | |
682 | ap_schedule_poll_timer(); | |
683 | else | |
684 | tasklet_schedule(&ap_tasklet); | |
685 | if (ap_thread_flag) | |
686 | rc = ap_poll_thread_start(); | |
687 | } else { | |
688 | ap_device_probe(dev); | |
689 | ap_reset(ap_dev); | |
690 | setup_timer(&ap_dev->timeout, ap_request_timeout, | |
691 | (unsigned long) ap_dev); | |
692 | } | |
693 | ||
694 | return rc; | |
695 | } | |
696 | ||
1534c382 MS |
697 | static struct bus_type ap_bus_type = { |
698 | .name = "ap", | |
699 | .match = &ap_bus_match, | |
700 | .uevent = &ap_uevent, | |
772f5472 FB |
701 | .suspend = ap_bus_suspend, |
702 | .resume = ap_bus_resume | |
1534c382 MS |
703 | }; |
704 | ||
705 | static int ap_device_probe(struct device *dev) | |
706 | { | |
707 | struct ap_device *ap_dev = to_ap_dev(dev); | |
708 | struct ap_driver *ap_drv = to_ap_drv(dev->driver); | |
709 | int rc; | |
710 | ||
711 | ap_dev->drv = ap_drv; | |
712 | rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; | |
faa582ca | 713 | if (!rc) { |
43c207e6 | 714 | spin_lock_bh(&ap_device_list_lock); |
faa582ca | 715 | list_add(&ap_dev->list, &ap_device_list); |
43c207e6 | 716 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca | 717 | } |
1534c382 MS |
718 | return rc; |
719 | } | |
720 | ||
721 | /** | |
1749a81d FB |
722 | * __ap_flush_queue(): Flush requests. |
723 | * @ap_dev: Pointer to the AP device | |
724 | * | |
1534c382 | 725 | * Flush all requests from the request/pending queue of an AP device. |
1534c382 | 726 | */ |
4d284cac | 727 | static void __ap_flush_queue(struct ap_device *ap_dev) |
1534c382 MS |
728 | { |
729 | struct ap_message *ap_msg, *next; | |
730 | ||
731 | list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) { | |
732 | list_del_init(&ap_msg->list); | |
733 | ap_dev->pendingq_count--; | |
734 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
735 | } | |
736 | list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) { | |
737 | list_del_init(&ap_msg->list); | |
738 | ap_dev->requestq_count--; | |
739 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
740 | } | |
741 | } | |
742 | ||
743 | void ap_flush_queue(struct ap_device *ap_dev) | |
744 | { | |
745 | spin_lock_bh(&ap_dev->lock); | |
746 | __ap_flush_queue(ap_dev); | |
747 | spin_unlock_bh(&ap_dev->lock); | |
748 | } | |
749 | EXPORT_SYMBOL(ap_flush_queue); | |
750 | ||
751 | static int ap_device_remove(struct device *dev) | |
752 | { | |
753 | struct ap_device *ap_dev = to_ap_dev(dev); | |
754 | struct ap_driver *ap_drv = ap_dev->drv; | |
755 | ||
4e56296d | 756 | ap_flush_queue(ap_dev); |
af512ed0 | 757 | del_timer_sync(&ap_dev->timeout); |
43c207e6 | 758 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 759 | list_del_init(&ap_dev->list); |
43c207e6 | 760 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca RW |
761 | if (ap_drv->remove) |
762 | ap_drv->remove(ap_dev); | |
e675c0d2 RW |
763 | spin_lock_bh(&ap_dev->lock); |
764 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
765 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
766 | return 0; |
767 | } | |
768 | ||
769 | int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, | |
770 | char *name) | |
771 | { | |
772 | struct device_driver *drv = &ap_drv->driver; | |
773 | ||
774 | drv->bus = &ap_bus_type; | |
775 | drv->probe = ap_device_probe; | |
776 | drv->remove = ap_device_remove; | |
777 | drv->owner = owner; | |
778 | drv->name = name; | |
779 | return driver_register(drv); | |
780 | } | |
781 | EXPORT_SYMBOL(ap_driver_register); | |
782 | ||
783 | void ap_driver_unregister(struct ap_driver *ap_drv) | |
784 | { | |
785 | driver_unregister(&ap_drv->driver); | |
786 | } | |
787 | EXPORT_SYMBOL(ap_driver_unregister); | |
788 | ||
1749a81d | 789 | /* |
1534c382 MS |
790 | * AP bus attributes. |
791 | */ | |
792 | static ssize_t ap_domain_show(struct bus_type *bus, char *buf) | |
793 | { | |
794 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); | |
795 | } | |
796 | ||
797 | static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL); | |
798 | ||
799 | static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) | |
800 | { | |
801 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); | |
802 | } | |
803 | ||
cb17a636 FB |
804 | static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) |
805 | { | |
806 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
807 | ap_using_interrupts() ? 1 : 0); | |
808 | } | |
809 | ||
810 | static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); | |
811 | ||
1534c382 MS |
812 | static ssize_t ap_config_time_store(struct bus_type *bus, |
813 | const char *buf, size_t count) | |
814 | { | |
815 | int time; | |
816 | ||
817 | if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) | |
818 | return -EINVAL; | |
819 | ap_config_time = time; | |
820 | if (!timer_pending(&ap_config_timer) || | |
821 | !mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) { | |
822 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
823 | add_timer(&ap_config_timer); | |
824 | } | |
825 | return count; | |
826 | } | |
827 | ||
828 | static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); | |
829 | ||
830 | static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) | |
831 | { | |
832 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); | |
833 | } | |
834 | ||
835 | static ssize_t ap_poll_thread_store(struct bus_type *bus, | |
836 | const char *buf, size_t count) | |
837 | { | |
838 | int flag, rc; | |
839 | ||
840 | if (sscanf(buf, "%d\n", &flag) != 1) | |
841 | return -EINVAL; | |
842 | if (flag) { | |
843 | rc = ap_poll_thread_start(); | |
844 | if (rc) | |
845 | return rc; | |
846 | } | |
847 | else | |
848 | ap_poll_thread_stop(); | |
849 | return count; | |
850 | } | |
851 | ||
852 | static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); | |
853 | ||
fe137230 FB |
854 | static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) |
855 | { | |
856 | return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); | |
857 | } | |
858 | ||
859 | static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, | |
860 | size_t count) | |
861 | { | |
862 | unsigned long long time; | |
863 | ktime_t hr_time; | |
864 | ||
865 | /* 120 seconds = maximum poll interval */ | |
cb17a636 FB |
866 | if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || |
867 | time > 120000000000ULL) | |
fe137230 FB |
868 | return -EINVAL; |
869 | poll_timeout = time; | |
870 | hr_time = ktime_set(0, poll_timeout); | |
871 | ||
872 | if (!hrtimer_is_queued(&ap_poll_timer) || | |
6c644eae AV |
873 | !hrtimer_forward(&ap_poll_timer, hrtimer_get_expires(&ap_poll_timer), hr_time)) { |
874 | hrtimer_set_expires(&ap_poll_timer, hr_time); | |
875 | hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); | |
fe137230 FB |
876 | } |
877 | return count; | |
878 | } | |
879 | ||
880 | static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); | |
881 | ||
1534c382 MS |
882 | static struct bus_attribute *const ap_bus_attrs[] = { |
883 | &bus_attr_ap_domain, | |
884 | &bus_attr_config_time, | |
885 | &bus_attr_poll_thread, | |
cb17a636 | 886 | &bus_attr_ap_interrupts, |
fe137230 FB |
887 | &bus_attr_poll_timeout, |
888 | NULL, | |
1534c382 MS |
889 | }; |
890 | ||
891 | /** | |
1749a81d FB |
892 | * ap_select_domain(): Select an AP domain. |
893 | * | |
894 | * Pick one of the 16 AP domains. | |
1534c382 | 895 | */ |
4d284cac | 896 | static int ap_select_domain(void) |
1534c382 MS |
897 | { |
898 | int queue_depth, device_type, count, max_count, best_domain; | |
899 | int rc, i, j; | |
900 | ||
1749a81d | 901 | /* |
1534c382 MS |
902 | * We want to use a single domain. Either the one specified with |
903 | * the "domain=" parameter or the domain with the maximum number | |
904 | * of devices. | |
905 | */ | |
906 | if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS) | |
907 | /* Domain has already been selected. */ | |
908 | return 0; | |
909 | best_domain = -1; | |
910 | max_count = 0; | |
911 | for (i = 0; i < AP_DOMAINS; i++) { | |
912 | count = 0; | |
913 | for (j = 0; j < AP_DEVICES; j++) { | |
914 | ap_qid_t qid = AP_MKQID(j, i); | |
915 | rc = ap_query_queue(qid, &queue_depth, &device_type); | |
916 | if (rc) | |
917 | continue; | |
918 | count++; | |
919 | } | |
920 | if (count > max_count) { | |
921 | max_count = count; | |
922 | best_domain = i; | |
923 | } | |
924 | } | |
925 | if (best_domain >= 0){ | |
926 | ap_domain_index = best_domain; | |
927 | return 0; | |
928 | } | |
929 | return -ENODEV; | |
930 | } | |
931 | ||
932 | /** | |
1749a81d | 933 | * ap_probe_device_type(): Find the device type of an AP. |
1534c382 | 934 | * @ap_dev: pointer to the AP device. |
1749a81d FB |
935 | * |
936 | * Find the device type if query queue returned a device type of 0. | |
1534c382 MS |
937 | */ |
938 | static int ap_probe_device_type(struct ap_device *ap_dev) | |
939 | { | |
940 | static unsigned char msg[] = { | |
941 | 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00, | |
942 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
943 | 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00, | |
944 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
945 | 0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50, | |
946 | 0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01, | |
947 | 0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00, | |
948 | 0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00, | |
949 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
950 | 0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00, | |
951 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
952 | 0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00, | |
953 | 0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00, | |
954 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
955 | 0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00, | |
956 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
957 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
958 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
959 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
960 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
961 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
962 | 0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00, | |
963 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
964 | 0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00, | |
965 | 0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20, | |
966 | 0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53, | |
967 | 0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22, | |
968 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
969 | 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88, | |
970 | 0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66, | |
971 | 0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44, | |
972 | 0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22, | |
973 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
974 | 0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77, | |
975 | 0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00, | |
976 | 0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00, | |
977 | 0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01, | |
978 | 0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c, | |
979 | 0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68, | |
980 | 0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66, | |
981 | 0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0, | |
982 | 0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8, | |
983 | 0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04, | |
984 | 0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57, | |
985 | 0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d, | |
986 | }; | |
987 | struct ap_queue_status status; | |
988 | unsigned long long psmid; | |
989 | char *reply; | |
990 | int rc, i; | |
991 | ||
992 | reply = (void *) get_zeroed_page(GFP_KERNEL); | |
993 | if (!reply) { | |
994 | rc = -ENOMEM; | |
995 | goto out; | |
996 | } | |
997 | ||
998 | status = __ap_send(ap_dev->qid, 0x0102030405060708ULL, | |
999 | msg, sizeof(msg)); | |
1000 | if (status.response_code != AP_RESPONSE_NORMAL) { | |
1001 | rc = -ENODEV; | |
1002 | goto out_free; | |
1003 | } | |
1004 | ||
1005 | /* Wait for the test message to complete. */ | |
1006 | for (i = 0; i < 6; i++) { | |
1007 | mdelay(300); | |
1008 | status = __ap_recv(ap_dev->qid, &psmid, reply, 4096); | |
1009 | if (status.response_code == AP_RESPONSE_NORMAL && | |
1010 | psmid == 0x0102030405060708ULL) | |
1011 | break; | |
1012 | } | |
1013 | if (i < 6) { | |
1014 | /* Got an answer. */ | |
1015 | if (reply[0] == 0x00 && reply[1] == 0x86) | |
1016 | ap_dev->device_type = AP_DEVICE_TYPE_PCICC; | |
1017 | else | |
1018 | ap_dev->device_type = AP_DEVICE_TYPE_PCICA; | |
1019 | rc = 0; | |
1020 | } else | |
1021 | rc = -ENODEV; | |
1022 | ||
1023 | out_free: | |
1024 | free_page((unsigned long) reply); | |
1025 | out: | |
1026 | return rc; | |
1027 | } | |
1028 | ||
cb17a636 FB |
1029 | static void ap_interrupt_handler(void *unused1, void *unused2) |
1030 | { | |
1031 | tasklet_schedule(&ap_tasklet); | |
1032 | } | |
1033 | ||
1534c382 | 1034 | /** |
1749a81d FB |
1035 | * __ap_scan_bus(): Scan the AP bus. |
1036 | * @dev: Pointer to device | |
1037 | * @data: Pointer to data | |
1038 | * | |
1039 | * Scan the AP bus for new devices. | |
1534c382 MS |
1040 | */ |
1041 | static int __ap_scan_bus(struct device *dev, void *data) | |
1042 | { | |
1043 | return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data; | |
1044 | } | |
1045 | ||
1046 | static void ap_device_release(struct device *dev) | |
1047 | { | |
1048 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1049 | ||
1050 | kfree(ap_dev); | |
1051 | } | |
1052 | ||
4927b3f7 | 1053 | static void ap_scan_bus(struct work_struct *unused) |
1534c382 MS |
1054 | { |
1055 | struct ap_device *ap_dev; | |
1056 | struct device *dev; | |
1057 | ap_qid_t qid; | |
1058 | int queue_depth, device_type; | |
1059 | int rc, i; | |
1060 | ||
1061 | if (ap_select_domain() != 0) | |
1062 | return; | |
1063 | for (i = 0; i < AP_DEVICES; i++) { | |
1064 | qid = AP_MKQID(i, ap_domain_index); | |
1065 | dev = bus_find_device(&ap_bus_type, NULL, | |
1066 | (void *)(unsigned long)qid, | |
1067 | __ap_scan_bus); | |
f3b017d8 | 1068 | rc = ap_query_queue(qid, &queue_depth, &device_type); |
c6a48264 | 1069 | if (dev) { |
af512ed0 RW |
1070 | if (rc == -EBUSY) { |
1071 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1072 | schedule_timeout(AP_RESET_TIMEOUT); | |
1073 | rc = ap_query_queue(qid, &queue_depth, | |
1074 | &device_type); | |
1075 | } | |
c6a48264 RW |
1076 | ap_dev = to_ap_dev(dev); |
1077 | spin_lock_bh(&ap_dev->lock); | |
1078 | if (rc || ap_dev->unregistered) { | |
1079 | spin_unlock_bh(&ap_dev->lock); | |
c6a48264 | 1080 | device_unregister(dev); |
af512ed0 | 1081 | put_device(dev); |
c6a48264 | 1082 | continue; |
af512ed0 RW |
1083 | } |
1084 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
1085 | put_device(dev); |
1086 | continue; | |
1087 | } | |
1534c382 MS |
1088 | if (rc) |
1089 | continue; | |
1090 | rc = ap_init_queue(qid); | |
1091 | if (rc) | |
1092 | continue; | |
1093 | ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL); | |
1094 | if (!ap_dev) | |
1095 | break; | |
1096 | ap_dev->qid = qid; | |
1097 | ap_dev->queue_depth = queue_depth; | |
4e56296d | 1098 | ap_dev->unregistered = 1; |
1534c382 MS |
1099 | spin_lock_init(&ap_dev->lock); |
1100 | INIT_LIST_HEAD(&ap_dev->pendingq); | |
1101 | INIT_LIST_HEAD(&ap_dev->requestq); | |
cf352ce0 | 1102 | INIT_LIST_HEAD(&ap_dev->list); |
af512ed0 RW |
1103 | setup_timer(&ap_dev->timeout, ap_request_timeout, |
1104 | (unsigned long) ap_dev); | |
1534c382 MS |
1105 | if (device_type == 0) |
1106 | ap_probe_device_type(ap_dev); | |
1107 | else | |
1108 | ap_dev->device_type = device_type; | |
1109 | ||
1110 | ap_dev->device.bus = &ap_bus_type; | |
1111 | ap_dev->device.parent = ap_root_device; | |
1bf5b285 CH |
1112 | dev_set_name(&ap_dev->device, "card%02x", |
1113 | AP_QID_DEVICE(ap_dev->qid)); | |
1534c382 MS |
1114 | ap_dev->device.release = ap_device_release; |
1115 | rc = device_register(&ap_dev->device); | |
1116 | if (rc) { | |
1117 | kfree(ap_dev); | |
1118 | continue; | |
1119 | } | |
1120 | /* Add device attributes. */ | |
1121 | rc = sysfs_create_group(&ap_dev->device.kobj, | |
1122 | &ap_dev_attr_group); | |
4e56296d RW |
1123 | if (!rc) { |
1124 | spin_lock_bh(&ap_dev->lock); | |
1125 | ap_dev->unregistered = 0; | |
1126 | spin_unlock_bh(&ap_dev->lock); | |
1127 | } | |
1128 | else | |
1534c382 MS |
1129 | device_unregister(&ap_dev->device); |
1130 | } | |
1131 | } | |
1132 | ||
1133 | static void | |
1134 | ap_config_timeout(unsigned long ptr) | |
1135 | { | |
1136 | queue_work(ap_work_queue, &ap_config_work); | |
1137 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1138 | add_timer(&ap_config_timer); | |
1139 | } | |
1140 | ||
1141 | /** | |
1749a81d FB |
1142 | * ap_schedule_poll_timer(): Schedule poll timer. |
1143 | * | |
1534c382 MS |
1144 | * Set up the timer to run the poll tasklet |
1145 | */ | |
1146 | static inline void ap_schedule_poll_timer(void) | |
1147 | { | |
772f5472 | 1148 | if (ap_using_interrupts() || ap_suspend_flag) |
cb17a636 | 1149 | return; |
fe137230 | 1150 | if (hrtimer_is_queued(&ap_poll_timer)) |
1534c382 | 1151 | return; |
fe137230 FB |
1152 | hrtimer_start(&ap_poll_timer, ktime_set(0, poll_timeout), |
1153 | HRTIMER_MODE_ABS); | |
1534c382 MS |
1154 | } |
1155 | ||
1156 | /** | |
1749a81d | 1157 | * ap_poll_read(): Receive pending reply messages from an AP device. |
1534c382 MS |
1158 | * @ap_dev: pointer to the AP device |
1159 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1160 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1161 | * |
1534c382 MS |
1162 | * Returns 0 if the device is still present, -ENODEV if not. |
1163 | */ | |
4d284cac | 1164 | static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1165 | { |
1166 | struct ap_queue_status status; | |
1167 | struct ap_message *ap_msg; | |
1168 | ||
1169 | if (ap_dev->queue_count <= 0) | |
1170 | return 0; | |
1171 | status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid, | |
1172 | ap_dev->reply->message, ap_dev->reply->length); | |
1173 | switch (status.response_code) { | |
1174 | case AP_RESPONSE_NORMAL: | |
1175 | atomic_dec(&ap_poll_requests); | |
af512ed0 | 1176 | ap_decrease_queue_count(ap_dev); |
1534c382 MS |
1177 | list_for_each_entry(ap_msg, &ap_dev->pendingq, list) { |
1178 | if (ap_msg->psmid != ap_dev->reply->psmid) | |
1179 | continue; | |
1180 | list_del_init(&ap_msg->list); | |
1181 | ap_dev->pendingq_count--; | |
1182 | ap_dev->drv->receive(ap_dev, ap_msg, ap_dev->reply); | |
1183 | break; | |
1184 | } | |
1185 | if (ap_dev->queue_count > 0) | |
1186 | *flags |= 1; | |
1187 | break; | |
1188 | case AP_RESPONSE_NO_PENDING_REPLY: | |
1189 | if (status.queue_empty) { | |
1190 | /* The card shouldn't forget requests but who knows. */ | |
e675c0d2 | 1191 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); |
1534c382 MS |
1192 | ap_dev->queue_count = 0; |
1193 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1194 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1195 | ap_dev->pendingq_count = 0; | |
1196 | } else | |
1197 | *flags |= 2; | |
1198 | break; | |
1199 | default: | |
1200 | return -ENODEV; | |
1201 | } | |
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | /** | |
1749a81d | 1206 | * ap_poll_write(): Send messages from the request queue to an AP device. |
1534c382 MS |
1207 | * @ap_dev: pointer to the AP device |
1208 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1209 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1210 | * |
1534c382 MS |
1211 | * Returns 0 if the device is still present, -ENODEV if not. |
1212 | */ | |
4d284cac | 1213 | static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1214 | { |
1215 | struct ap_queue_status status; | |
1216 | struct ap_message *ap_msg; | |
1217 | ||
1218 | if (ap_dev->requestq_count <= 0 || | |
1219 | ap_dev->queue_count >= ap_dev->queue_depth) | |
1220 | return 0; | |
1221 | /* Start the next request on the queue. */ | |
1222 | ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list); | |
1223 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
1224 | ap_msg->message, ap_msg->length); | |
1225 | switch (status.response_code) { | |
1226 | case AP_RESPONSE_NORMAL: | |
1227 | atomic_inc(&ap_poll_requests); | |
af512ed0 | 1228 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1229 | list_move_tail(&ap_msg->list, &ap_dev->pendingq); |
1230 | ap_dev->requestq_count--; | |
1231 | ap_dev->pendingq_count++; | |
1232 | if (ap_dev->queue_count < ap_dev->queue_depth && | |
1233 | ap_dev->requestq_count > 0) | |
1234 | *flags |= 1; | |
1235 | *flags |= 2; | |
1236 | break; | |
1237 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1238 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1239 | *flags |= 2; |
1240 | break; | |
1241 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
1242 | return -EINVAL; | |
1243 | default: | |
1244 | return -ENODEV; | |
1245 | } | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | /** | |
1749a81d | 1250 | * ap_poll_queue(): Poll AP device for pending replies and send new messages. |
1534c382 MS |
1251 | * @ap_dev: pointer to the bus device |
1252 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1253 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d FB |
1254 | * |
1255 | * Poll AP device for pending replies and send new messages. If either | |
1256 | * ap_poll_read or ap_poll_write returns -ENODEV unregister the device. | |
1534c382 MS |
1257 | * Returns 0. |
1258 | */ | |
1259 | static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags) | |
1260 | { | |
1261 | int rc; | |
1262 | ||
1263 | rc = ap_poll_read(ap_dev, flags); | |
1264 | if (rc) | |
1265 | return rc; | |
1266 | return ap_poll_write(ap_dev, flags); | |
1267 | } | |
1268 | ||
1269 | /** | |
1749a81d | 1270 | * __ap_queue_message(): Queue a message to a device. |
1534c382 MS |
1271 | * @ap_dev: pointer to the AP device |
1272 | * @ap_msg: the message to be queued | |
1749a81d FB |
1273 | * |
1274 | * Queue a message to a device. Returns 0 if successful. | |
1534c382 MS |
1275 | */ |
1276 | static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1277 | { | |
1278 | struct ap_queue_status status; | |
1279 | ||
1280 | if (list_empty(&ap_dev->requestq) && | |
1281 | ap_dev->queue_count < ap_dev->queue_depth) { | |
1282 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
1283 | ap_msg->message, ap_msg->length); | |
1284 | switch (status.response_code) { | |
1285 | case AP_RESPONSE_NORMAL: | |
1286 | list_add_tail(&ap_msg->list, &ap_dev->pendingq); | |
1287 | atomic_inc(&ap_poll_requests); | |
1288 | ap_dev->pendingq_count++; | |
af512ed0 | 1289 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1290 | ap_dev->total_request_count++; |
1291 | break; | |
1292 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1293 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1294 | list_add_tail(&ap_msg->list, &ap_dev->requestq); |
1295 | ap_dev->requestq_count++; | |
1296 | ap_dev->total_request_count++; | |
1297 | return -EBUSY; | |
1298 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
1299 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL)); | |
1300 | return -EINVAL; | |
1301 | default: /* Device is gone. */ | |
1302 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
1303 | return -ENODEV; | |
1304 | } | |
1305 | } else { | |
1306 | list_add_tail(&ap_msg->list, &ap_dev->requestq); | |
1307 | ap_dev->requestq_count++; | |
1308 | ap_dev->total_request_count++; | |
1309 | return -EBUSY; | |
1310 | } | |
1311 | ap_schedule_poll_timer(); | |
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1316 | { | |
1317 | unsigned long flags; | |
1318 | int rc; | |
1319 | ||
1320 | spin_lock_bh(&ap_dev->lock); | |
1321 | if (!ap_dev->unregistered) { | |
1322 | /* Make room on the queue by polling for finished requests. */ | |
1323 | rc = ap_poll_queue(ap_dev, &flags); | |
1324 | if (!rc) | |
1325 | rc = __ap_queue_message(ap_dev, ap_msg); | |
1326 | if (!rc) | |
1327 | wake_up(&ap_poll_wait); | |
4e56296d RW |
1328 | if (rc == -ENODEV) |
1329 | ap_dev->unregistered = 1; | |
1534c382 MS |
1330 | } else { |
1331 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
c6a48264 | 1332 | rc = -ENODEV; |
1534c382 MS |
1333 | } |
1334 | spin_unlock_bh(&ap_dev->lock); | |
1335 | if (rc == -ENODEV) | |
1336 | device_unregister(&ap_dev->device); | |
1337 | } | |
1338 | EXPORT_SYMBOL(ap_queue_message); | |
1339 | ||
1340 | /** | |
1749a81d FB |
1341 | * ap_cancel_message(): Cancel a crypto request. |
1342 | * @ap_dev: The AP device that has the message queued | |
1343 | * @ap_msg: The message that is to be removed | |
1344 | * | |
1534c382 | 1345 | * Cancel a crypto request. This is done by removing the request |
1749a81d | 1346 | * from the device pending or request queue. Note that the |
1534c382 MS |
1347 | * request stays on the AP queue. When it finishes the message |
1348 | * reply will be discarded because the psmid can't be found. | |
1534c382 MS |
1349 | */ |
1350 | void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1351 | { | |
1352 | struct ap_message *tmp; | |
1353 | ||
1354 | spin_lock_bh(&ap_dev->lock); | |
1355 | if (!list_empty(&ap_msg->list)) { | |
1356 | list_for_each_entry(tmp, &ap_dev->pendingq, list) | |
1357 | if (tmp->psmid == ap_msg->psmid) { | |
1358 | ap_dev->pendingq_count--; | |
1359 | goto found; | |
1360 | } | |
1361 | ap_dev->requestq_count--; | |
1362 | found: | |
1363 | list_del_init(&ap_msg->list); | |
1364 | } | |
1365 | spin_unlock_bh(&ap_dev->lock); | |
1366 | } | |
1367 | EXPORT_SYMBOL(ap_cancel_message); | |
1368 | ||
1369 | /** | |
1749a81d | 1370 | * ap_poll_timeout(): AP receive polling for finished AP requests. |
fe137230 | 1371 | * @unused: Unused pointer. |
1749a81d | 1372 | * |
fe137230 | 1373 | * Schedules the AP tasklet using a high resolution timer. |
1534c382 | 1374 | */ |
fe137230 | 1375 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) |
1534c382 MS |
1376 | { |
1377 | tasklet_schedule(&ap_tasklet); | |
fe137230 | 1378 | return HRTIMER_NORESTART; |
1534c382 MS |
1379 | } |
1380 | ||
af512ed0 | 1381 | /** |
1749a81d FB |
1382 | * ap_reset(): Reset a not responding AP device. |
1383 | * @ap_dev: Pointer to the AP device | |
1384 | * | |
af512ed0 RW |
1385 | * Reset a not responding AP device and move all requests from the |
1386 | * pending queue to the request queue. | |
1387 | */ | |
1388 | static void ap_reset(struct ap_device *ap_dev) | |
1389 | { | |
1390 | int rc; | |
1391 | ||
1392 | ap_dev->reset = AP_RESET_IGNORE; | |
1393 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
1394 | ap_dev->queue_count = 0; | |
1395 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1396 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1397 | ap_dev->pendingq_count = 0; | |
1398 | rc = ap_init_queue(ap_dev->qid); | |
1399 | if (rc == -ENODEV) | |
1400 | ap_dev->unregistered = 1; | |
1401 | } | |
1402 | ||
43c207e6 | 1403 | static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 | 1404 | { |
1534c382 MS |
1405 | spin_lock(&ap_dev->lock); |
1406 | if (!ap_dev->unregistered) { | |
c6a48264 | 1407 | if (ap_poll_queue(ap_dev, flags)) |
4e56296d | 1408 | ap_dev->unregistered = 1; |
af512ed0 RW |
1409 | if (ap_dev->reset == AP_RESET_DO) |
1410 | ap_reset(ap_dev); | |
c6a48264 | 1411 | } |
1534c382 | 1412 | spin_unlock(&ap_dev->lock); |
1534c382 MS |
1413 | return 0; |
1414 | } | |
1415 | ||
1749a81d FB |
1416 | /** |
1417 | * ap_poll_all(): Poll all AP devices. | |
1418 | * @dummy: Unused variable | |
1419 | * | |
1420 | * Poll all AP devices on the bus in a round robin fashion. Continue | |
1421 | * polling until bit 2^0 of the control flags is not set. If bit 2^1 | |
1422 | * of the control flags has been set arm the poll timer. | |
1423 | */ | |
1534c382 MS |
1424 | static void ap_poll_all(unsigned long dummy) |
1425 | { | |
1426 | unsigned long flags; | |
cf352ce0 | 1427 | struct ap_device *ap_dev; |
1534c382 | 1428 | |
cb17a636 FB |
1429 | /* Reset the indicator if interrupts are used. Thus new interrupts can |
1430 | * be received. Doing it in the beginning of the tasklet is therefor | |
1431 | * important that no requests on any AP get lost. | |
1432 | */ | |
1433 | if (ap_using_interrupts()) | |
1434 | xchg((u8 *)ap_interrupt_indicator, 0); | |
1534c382 MS |
1435 | do { |
1436 | flags = 0; | |
43c207e6 | 1437 | spin_lock(&ap_device_list_lock); |
cf352ce0 | 1438 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
43c207e6 | 1439 | __ap_poll_device(ap_dev, &flags); |
cf352ce0 | 1440 | } |
43c207e6 | 1441 | spin_unlock(&ap_device_list_lock); |
1534c382 MS |
1442 | } while (flags & 1); |
1443 | if (flags & 2) | |
1444 | ap_schedule_poll_timer(); | |
1445 | } | |
1446 | ||
1447 | /** | |
1749a81d FB |
1448 | * ap_poll_thread(): Thread that polls for finished requests. |
1449 | * @data: Unused pointer | |
1450 | * | |
1534c382 MS |
1451 | * AP bus poll thread. The purpose of this thread is to poll for |
1452 | * finished requests in a loop if there is a "free" cpu - that is | |
1453 | * a cpu that doesn't have anything better to do. The polling stops | |
1454 | * as soon as there is another task or if all messages have been | |
1455 | * delivered. | |
1456 | */ | |
1457 | static int ap_poll_thread(void *data) | |
1458 | { | |
1459 | DECLARE_WAITQUEUE(wait, current); | |
1460 | unsigned long flags; | |
1461 | int requests; | |
cf352ce0 | 1462 | struct ap_device *ap_dev; |
1534c382 | 1463 | |
d83682b3 | 1464 | set_user_nice(current, 19); |
1534c382 | 1465 | while (1) { |
772f5472 FB |
1466 | if (ap_suspend_flag) |
1467 | return 0; | |
1534c382 MS |
1468 | if (need_resched()) { |
1469 | schedule(); | |
1470 | continue; | |
1471 | } | |
1472 | add_wait_queue(&ap_poll_wait, &wait); | |
1473 | set_current_state(TASK_INTERRUPTIBLE); | |
1474 | if (kthread_should_stop()) | |
1475 | break; | |
1476 | requests = atomic_read(&ap_poll_requests); | |
1477 | if (requests <= 0) | |
1478 | schedule(); | |
1479 | set_current_state(TASK_RUNNING); | |
1480 | remove_wait_queue(&ap_poll_wait, &wait); | |
1481 | ||
1534c382 | 1482 | flags = 0; |
43c207e6 | 1483 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 1484 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
43c207e6 | 1485 | __ap_poll_device(ap_dev, &flags); |
cf352ce0 | 1486 | } |
43c207e6 | 1487 | spin_unlock_bh(&ap_device_list_lock); |
1534c382 MS |
1488 | } |
1489 | set_current_state(TASK_RUNNING); | |
1490 | remove_wait_queue(&ap_poll_wait, &wait); | |
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | static int ap_poll_thread_start(void) | |
1495 | { | |
1496 | int rc; | |
1497 | ||
772f5472 | 1498 | if (ap_using_interrupts() || ap_suspend_flag) |
cb17a636 | 1499 | return 0; |
1534c382 MS |
1500 | mutex_lock(&ap_poll_thread_mutex); |
1501 | if (!ap_poll_kthread) { | |
1502 | ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); | |
1503 | rc = IS_ERR(ap_poll_kthread) ? PTR_ERR(ap_poll_kthread) : 0; | |
1504 | if (rc) | |
1505 | ap_poll_kthread = NULL; | |
1506 | } | |
1507 | else | |
1508 | rc = 0; | |
1509 | mutex_unlock(&ap_poll_thread_mutex); | |
1510 | return rc; | |
1511 | } | |
1512 | ||
1513 | static void ap_poll_thread_stop(void) | |
1514 | { | |
1515 | mutex_lock(&ap_poll_thread_mutex); | |
1516 | if (ap_poll_kthread) { | |
1517 | kthread_stop(ap_poll_kthread); | |
1518 | ap_poll_kthread = NULL; | |
1519 | } | |
1520 | mutex_unlock(&ap_poll_thread_mutex); | |
1521 | } | |
1522 | ||
af512ed0 | 1523 | /** |
1749a81d FB |
1524 | * ap_request_timeout(): Handling of request timeouts |
1525 | * @data: Holds the AP device. | |
1526 | * | |
1527 | * Handles request timeouts. | |
af512ed0 RW |
1528 | */ |
1529 | static void ap_request_timeout(unsigned long data) | |
1530 | { | |
1531 | struct ap_device *ap_dev = (struct ap_device *) data; | |
1532 | ||
cb17a636 | 1533 | if (ap_dev->reset == AP_RESET_ARMED) { |
af512ed0 | 1534 | ap_dev->reset = AP_RESET_DO; |
cb17a636 FB |
1535 | |
1536 | if (ap_using_interrupts()) | |
1537 | tasklet_schedule(&ap_tasklet); | |
1538 | } | |
af512ed0 RW |
1539 | } |
1540 | ||
13e742ba RW |
1541 | static void ap_reset_domain(void) |
1542 | { | |
1543 | int i; | |
1544 | ||
39aa7cf6 RW |
1545 | if (ap_domain_index != -1) |
1546 | for (i = 0; i < AP_DEVICES; i++) | |
1547 | ap_reset_queue(AP_MKQID(i, ap_domain_index)); | |
13e742ba RW |
1548 | } |
1549 | ||
1550 | static void ap_reset_all(void) | |
85eca850 RW |
1551 | { |
1552 | int i, j; | |
1553 | ||
1554 | for (i = 0; i < AP_DOMAINS; i++) | |
1555 | for (j = 0; j < AP_DEVICES; j++) | |
1556 | ap_reset_queue(AP_MKQID(j, i)); | |
1557 | } | |
1558 | ||
1559 | static struct reset_call ap_reset_call = { | |
13e742ba | 1560 | .fn = ap_reset_all, |
85eca850 RW |
1561 | }; |
1562 | ||
1534c382 | 1563 | /** |
1749a81d FB |
1564 | * ap_module_init(): The module initialization code. |
1565 | * | |
1566 | * Initializes the module. | |
1534c382 MS |
1567 | */ |
1568 | int __init ap_module_init(void) | |
1569 | { | |
1570 | int rc, i; | |
1571 | ||
1572 | if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) { | |
136f7a1c MS |
1573 | pr_warning("%d is not a valid cryptographic domain\n", |
1574 | ap_domain_index); | |
1534c382 MS |
1575 | return -EINVAL; |
1576 | } | |
1577 | if (ap_instructions_available() != 0) { | |
136f7a1c MS |
1578 | pr_warning("The hardware system does not support " |
1579 | "AP instructions\n"); | |
1534c382 MS |
1580 | return -ENODEV; |
1581 | } | |
cb17a636 FB |
1582 | if (ap_interrupts_available()) { |
1583 | isc_register(AP_ISC); | |
1584 | ap_interrupt_indicator = s390_register_adapter_interrupt( | |
1585 | &ap_interrupt_handler, NULL, AP_ISC); | |
1586 | if (IS_ERR(ap_interrupt_indicator)) { | |
1587 | ap_interrupt_indicator = NULL; | |
1588 | isc_unregister(AP_ISC); | |
1589 | } | |
1590 | } | |
1591 | ||
85eca850 | 1592 | register_reset_call(&ap_reset_call); |
1534c382 MS |
1593 | |
1594 | /* Create /sys/bus/ap. */ | |
1595 | rc = bus_register(&ap_bus_type); | |
1596 | if (rc) | |
1597 | goto out; | |
1598 | for (i = 0; ap_bus_attrs[i]; i++) { | |
1599 | rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); | |
1600 | if (rc) | |
1601 | goto out_bus; | |
1602 | } | |
1603 | ||
1604 | /* Create /sys/devices/ap. */ | |
035da16f | 1605 | ap_root_device = root_device_register("ap"); |
1534c382 MS |
1606 | rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0; |
1607 | if (rc) | |
1608 | goto out_bus; | |
1609 | ||
1610 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
1611 | if (!ap_work_queue) { | |
1612 | rc = -ENOMEM; | |
1613 | goto out_root; | |
1614 | } | |
1615 | ||
1616 | if (ap_select_domain() == 0) | |
1617 | ap_scan_bus(NULL); | |
1618 | ||
1749a81d | 1619 | /* Setup the AP bus rescan timer. */ |
1534c382 MS |
1620 | init_timer(&ap_config_timer); |
1621 | ap_config_timer.function = ap_config_timeout; | |
1622 | ap_config_timer.data = 0; | |
1623 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1624 | add_timer(&ap_config_timer); | |
1625 | ||
fe137230 FB |
1626 | /* Setup the high resultion poll timer. |
1627 | * If we are running under z/VM adjust polling to z/VM polling rate. | |
1628 | */ | |
1629 | if (MACHINE_IS_VM) | |
1630 | poll_timeout = 1500000; | |
1631 | hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
1632 | ap_poll_timer.function = ap_poll_timeout; | |
1633 | ||
1534c382 MS |
1634 | /* Start the low priority AP bus poll thread. */ |
1635 | if (ap_thread_flag) { | |
1636 | rc = ap_poll_thread_start(); | |
1637 | if (rc) | |
1638 | goto out_work; | |
1639 | } | |
1640 | ||
1641 | return 0; | |
1642 | ||
1643 | out_work: | |
1644 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1645 | hrtimer_cancel(&ap_poll_timer); |
1534c382 MS |
1646 | destroy_workqueue(ap_work_queue); |
1647 | out_root: | |
035da16f | 1648 | root_device_unregister(ap_root_device); |
1534c382 MS |
1649 | out_bus: |
1650 | while (i--) | |
1651 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1652 | bus_unregister(&ap_bus_type); | |
1653 | out: | |
85eca850 | 1654 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1655 | if (ap_using_interrupts()) { |
1656 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1657 | isc_unregister(AP_ISC); | |
1658 | } | |
1534c382 MS |
1659 | return rc; |
1660 | } | |
1661 | ||
1662 | static int __ap_match_all(struct device *dev, void *data) | |
1663 | { | |
1664 | return 1; | |
1665 | } | |
1666 | ||
1667 | /** | |
1749a81d FB |
1668 | * ap_modules_exit(): The module termination code |
1669 | * | |
1670 | * Terminates the module. | |
1534c382 MS |
1671 | */ |
1672 | void ap_module_exit(void) | |
1673 | { | |
1674 | int i; | |
1675 | struct device *dev; | |
1676 | ||
13e742ba | 1677 | ap_reset_domain(); |
1534c382 MS |
1678 | ap_poll_thread_stop(); |
1679 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1680 | hrtimer_cancel(&ap_poll_timer); |
1534c382 | 1681 | destroy_workqueue(ap_work_queue); |
13e742ba | 1682 | tasklet_kill(&ap_tasklet); |
035da16f | 1683 | root_device_unregister(ap_root_device); |
1534c382 MS |
1684 | while ((dev = bus_find_device(&ap_bus_type, NULL, NULL, |
1685 | __ap_match_all))) | |
1686 | { | |
1687 | device_unregister(dev); | |
1688 | put_device(dev); | |
1689 | } | |
1690 | for (i = 0; ap_bus_attrs[i]; i++) | |
1691 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1692 | bus_unregister(&ap_bus_type); | |
85eca850 | 1693 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1694 | if (ap_using_interrupts()) { |
1695 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1696 | isc_unregister(AP_ISC); | |
1697 | } | |
1534c382 MS |
1698 | } |
1699 | ||
1700 | #ifndef CONFIG_ZCRYPT_MONOLITHIC | |
1701 | module_init(ap_module_init); | |
1702 | module_exit(ap_module_exit); | |
1703 | #endif |