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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 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/workqueue.h> | |
33 | #include <linux/notifier.h> | |
34 | #include <linux/kthread.h> | |
35 | #include <linux/mutex.h> | |
36 | #include <asm/s390_rdev.h> | |
85eca850 | 37 | #include <asm/reset.h> |
cb17a636 FB |
38 | #include <asm/airq.h> |
39 | #include <asm/atomic.h> | |
40 | #include <asm/system.h> | |
41 | #include <asm/isc.h> | |
fe137230 FB |
42 | #include <linux/hrtimer.h> |
43 | #include <linux/ktime.h> | |
1534c382 MS |
44 | |
45 | #include "ap_bus.h" | |
46 | ||
47 | /* Some prototypes. */ | |
4927b3f7 | 48 | static void ap_scan_bus(struct work_struct *); |
1534c382 | 49 | static void ap_poll_all(unsigned long); |
fe137230 | 50 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *); |
1534c382 MS |
51 | static int ap_poll_thread_start(void); |
52 | static void ap_poll_thread_stop(void); | |
af512ed0 | 53 | static void ap_request_timeout(unsigned long); |
cb17a636 | 54 | static inline void ap_schedule_poll_timer(void); |
1534c382 | 55 | |
1749a81d | 56 | /* |
1534c382 MS |
57 | * Module description. |
58 | */ | |
59 | MODULE_AUTHOR("IBM Corporation"); | |
60 | MODULE_DESCRIPTION("Adjunct Processor Bus driver, " | |
61 | "Copyright 2006 IBM Corporation"); | |
62 | MODULE_LICENSE("GPL"); | |
63 | ||
1749a81d | 64 | /* |
1534c382 MS |
65 | * Module parameter |
66 | */ | |
67 | int ap_domain_index = -1; /* Adjunct Processor Domain Index */ | |
68 | module_param_named(domain, ap_domain_index, int, 0000); | |
69 | MODULE_PARM_DESC(domain, "domain index for ap devices"); | |
70 | EXPORT_SYMBOL(ap_domain_index); | |
71 | ||
b90b34c6 | 72 | static int ap_thread_flag = 0; |
1534c382 | 73 | module_param_named(poll_thread, ap_thread_flag, int, 0000); |
b90b34c6 | 74 | MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); |
1534c382 MS |
75 | |
76 | static struct device *ap_root_device = NULL; | |
cf352ce0 RW |
77 | static DEFINE_SPINLOCK(ap_device_lock); |
78 | static LIST_HEAD(ap_device_list); | |
1534c382 | 79 | |
1749a81d | 80 | /* |
1534c382 MS |
81 | * Workqueue & timer for bus rescan. |
82 | */ | |
83 | static struct workqueue_struct *ap_work_queue; | |
84 | static struct timer_list ap_config_timer; | |
85 | static int ap_config_time = AP_CONFIG_TIME; | |
4927b3f7 | 86 | static DECLARE_WORK(ap_config_work, ap_scan_bus); |
1534c382 | 87 | |
1749a81d | 88 | /* |
cb17a636 | 89 | * Tasklet & timer for AP request polling and interrupts |
1534c382 | 90 | */ |
1534c382 MS |
91 | static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0); |
92 | static atomic_t ap_poll_requests = ATOMIC_INIT(0); | |
93 | static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); | |
94 | static struct task_struct *ap_poll_kthread = NULL; | |
95 | static DEFINE_MUTEX(ap_poll_thread_mutex); | |
cb17a636 | 96 | static void *ap_interrupt_indicator; |
fe137230 FB |
97 | static struct hrtimer ap_poll_timer; |
98 | /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. | |
99 | * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ | |
100 | static unsigned long long poll_timeout = 250000; | |
1534c382 | 101 | |
cb17a636 FB |
102 | /** |
103 | * ap_using_interrupts() - Returns non-zero if interrupt support is | |
104 | * available. | |
105 | */ | |
106 | static inline int ap_using_interrupts(void) | |
107 | { | |
108 | return ap_interrupt_indicator != NULL; | |
109 | } | |
110 | ||
1534c382 | 111 | /** |
1749a81d | 112 | * ap_intructions_available() - Test if AP instructions are available. |
1534c382 | 113 | * |
1749a81d | 114 | * Returns 0 if the AP instructions are installed. |
1534c382 MS |
115 | */ |
116 | static inline int ap_instructions_available(void) | |
117 | { | |
118 | register unsigned long reg0 asm ("0") = AP_MKQID(0,0); | |
119 | register unsigned long reg1 asm ("1") = -ENODEV; | |
120 | register unsigned long reg2 asm ("2") = 0UL; | |
121 | ||
122 | asm volatile( | |
123 | " .long 0xb2af0000\n" /* PQAP(TAPQ) */ | |
124 | "0: la %1,0\n" | |
125 | "1:\n" | |
126 | EX_TABLE(0b, 1b) | |
127 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" ); | |
128 | return reg1; | |
129 | } | |
130 | ||
cb17a636 FB |
131 | /** |
132 | * ap_interrupts_available(): Test if AP interrupts are available. | |
133 | * | |
134 | * Returns 1 if AP interrupts are available. | |
135 | */ | |
136 | static int ap_interrupts_available(void) | |
137 | { | |
138 | unsigned long long facility_bits[2]; | |
139 | ||
140 | if (stfle(facility_bits, 2) <= 1) | |
141 | return 0; | |
142 | if (!(facility_bits[0] & (1ULL << 61)) || | |
143 | !(facility_bits[1] & (1ULL << 62))) | |
144 | return 0; | |
145 | return 1; | |
146 | } | |
147 | ||
1534c382 | 148 | /** |
1749a81d FB |
149 | * ap_test_queue(): Test adjunct processor queue. |
150 | * @qid: The AP queue number | |
151 | * @queue_depth: Pointer to queue depth value | |
152 | * @device_type: Pointer to device type value | |
1534c382 | 153 | * |
1749a81d | 154 | * Returns AP queue status structure. |
1534c382 MS |
155 | */ |
156 | static inline struct ap_queue_status | |
157 | ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
158 | { | |
159 | register unsigned long reg0 asm ("0") = qid; | |
160 | register struct ap_queue_status reg1 asm ("1"); | |
161 | register unsigned long reg2 asm ("2") = 0UL; | |
162 | ||
163 | asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */ | |
164 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
165 | *device_type = (int) (reg2 >> 24); | |
166 | *queue_depth = (int) (reg2 & 0xff); | |
167 | return reg1; | |
168 | } | |
169 | ||
170 | /** | |
1749a81d FB |
171 | * ap_reset_queue(): Reset adjunct processor queue. |
172 | * @qid: The AP queue number | |
1534c382 | 173 | * |
1749a81d | 174 | * Returns AP queue status structure. |
1534c382 MS |
175 | */ |
176 | static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) | |
177 | { | |
178 | register unsigned long reg0 asm ("0") = qid | 0x01000000UL; | |
179 | register struct ap_queue_status reg1 asm ("1"); | |
180 | register unsigned long reg2 asm ("2") = 0UL; | |
181 | ||
182 | asm volatile( | |
183 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
184 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
185 | return reg1; | |
186 | } | |
187 | ||
cb17a636 FB |
188 | #ifdef CONFIG_64BIT |
189 | /** | |
190 | * ap_queue_interruption_control(): Enable interruption for a specific AP. | |
191 | * @qid: The AP queue number | |
192 | * @ind: The notification indicator byte | |
193 | * | |
194 | * Returns AP queue status. | |
195 | */ | |
196 | static inline struct ap_queue_status | |
197 | ap_queue_interruption_control(ap_qid_t qid, void *ind) | |
198 | { | |
199 | register unsigned long reg0 asm ("0") = qid | 0x03000000UL; | |
200 | register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC; | |
201 | register struct ap_queue_status reg1_out asm ("1"); | |
202 | register void *reg2 asm ("2") = ind; | |
203 | asm volatile( | |
204 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
205 | : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) | |
206 | : | |
207 | : "cc" ); | |
208 | return reg1_out; | |
209 | } | |
210 | #endif | |
211 | ||
212 | /** | |
213 | * ap_queue_enable_interruption(): Enable interruption on an AP. | |
214 | * @qid: The AP queue number | |
215 | * @ind: the notification indicator byte | |
216 | * | |
217 | * Enables interruption on AP queue via ap_queue_interruption_control(). Based | |
218 | * on the return value it waits a while and tests the AP queue if interrupts | |
219 | * have been switched on using ap_test_queue(). | |
220 | */ | |
221 | static int ap_queue_enable_interruption(ap_qid_t qid, void *ind) | |
222 | { | |
223 | #ifdef CONFIG_64BIT | |
224 | struct ap_queue_status status; | |
225 | int t_depth, t_device_type, rc, i; | |
226 | ||
227 | rc = -EBUSY; | |
228 | status = ap_queue_interruption_control(qid, ind); | |
229 | ||
230 | for (i = 0; i < AP_MAX_RESET; i++) { | |
231 | switch (status.response_code) { | |
232 | case AP_RESPONSE_NORMAL: | |
233 | if (status.int_enabled) | |
234 | return 0; | |
235 | break; | |
236 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
237 | case AP_RESPONSE_BUSY: | |
238 | break; | |
239 | case AP_RESPONSE_Q_NOT_AVAIL: | |
240 | case AP_RESPONSE_DECONFIGURED: | |
241 | case AP_RESPONSE_CHECKSTOPPED: | |
242 | case AP_RESPONSE_INVALID_ADDRESS: | |
243 | return -ENODEV; | |
244 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
245 | if (status.int_enabled) | |
246 | return 0; | |
247 | break; | |
248 | default: | |
249 | break; | |
250 | } | |
251 | if (i < AP_MAX_RESET - 1) { | |
252 | udelay(5); | |
253 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
254 | } | |
255 | } | |
256 | return rc; | |
257 | #else | |
258 | return -EINVAL; | |
259 | #endif | |
260 | } | |
261 | ||
1534c382 | 262 | /** |
1749a81d FB |
263 | * __ap_send(): Send message to adjunct processor queue. |
264 | * @qid: The AP queue number | |
265 | * @psmid: The program supplied message identifier | |
266 | * @msg: The message text | |
267 | * @length: The message length | |
1534c382 | 268 | * |
1749a81d | 269 | * Returns AP queue status structure. |
1534c382 | 270 | * Condition code 1 on NQAP can't happen because the L bit is 1. |
1534c382 MS |
271 | * Condition code 2 on NQAP also means the send is incomplete, |
272 | * because a segment boundary was reached. The NQAP is repeated. | |
273 | */ | |
274 | static inline struct ap_queue_status | |
275 | __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
276 | { | |
277 | typedef struct { char _[length]; } msgblock; | |
278 | register unsigned long reg0 asm ("0") = qid | 0x40000000UL; | |
279 | register struct ap_queue_status reg1 asm ("1"); | |
280 | register unsigned long reg2 asm ("2") = (unsigned long) msg; | |
281 | register unsigned long reg3 asm ("3") = (unsigned long) length; | |
282 | register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32); | |
283 | register unsigned long reg5 asm ("5") = (unsigned int) psmid; | |
284 | ||
285 | asm volatile ( | |
286 | "0: .long 0xb2ad0042\n" /* DQAP */ | |
287 | " brc 2,0b" | |
288 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) | |
289 | : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) | |
290 | : "cc" ); | |
291 | return reg1; | |
292 | } | |
293 | ||
294 | int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
295 | { | |
296 | struct ap_queue_status status; | |
297 | ||
298 | status = __ap_send(qid, psmid, msg, length); | |
299 | switch (status.response_code) { | |
300 | case AP_RESPONSE_NORMAL: | |
301 | return 0; | |
302 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 303 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
304 | return -EBUSY; |
305 | default: /* Device is gone. */ | |
306 | return -ENODEV; | |
307 | } | |
308 | } | |
309 | EXPORT_SYMBOL(ap_send); | |
310 | ||
1749a81d FB |
311 | /** |
312 | * __ap_recv(): Receive message from adjunct processor queue. | |
313 | * @qid: The AP queue number | |
314 | * @psmid: Pointer to program supplied message identifier | |
315 | * @msg: The message text | |
316 | * @length: The message length | |
1534c382 | 317 | * |
1749a81d | 318 | * Returns AP queue status structure. |
1534c382 MS |
319 | * Condition code 1 on DQAP means the receive has taken place |
320 | * but only partially. The response is incomplete, hence the | |
321 | * DQAP is repeated. | |
1534c382 MS |
322 | * Condition code 2 on DQAP also means the receive is incomplete, |
323 | * this time because a segment boundary was reached. Again, the | |
324 | * DQAP is repeated. | |
1534c382 MS |
325 | * Note that gpr2 is used by the DQAP instruction to keep track of |
326 | * any 'residual' length, in case the instruction gets interrupted. | |
327 | * Hence it gets zeroed before the instruction. | |
328 | */ | |
329 | static inline struct ap_queue_status | |
330 | __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
331 | { | |
332 | typedef struct { char _[length]; } msgblock; | |
333 | register unsigned long reg0 asm("0") = qid | 0x80000000UL; | |
334 | register struct ap_queue_status reg1 asm ("1"); | |
335 | register unsigned long reg2 asm("2") = 0UL; | |
336 | register unsigned long reg4 asm("4") = (unsigned long) msg; | |
337 | register unsigned long reg5 asm("5") = (unsigned long) length; | |
338 | register unsigned long reg6 asm("6") = 0UL; | |
339 | register unsigned long reg7 asm("7") = 0UL; | |
340 | ||
341 | ||
342 | asm volatile( | |
343 | "0: .long 0xb2ae0064\n" | |
344 | " brc 6,0b\n" | |
345 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), | |
346 | "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), | |
347 | "=m" (*(msgblock *) msg) : : "cc" ); | |
348 | *psmid = (((unsigned long long) reg6) << 32) + reg7; | |
349 | return reg1; | |
350 | } | |
351 | ||
352 | int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
353 | { | |
354 | struct ap_queue_status status; | |
355 | ||
356 | status = __ap_recv(qid, psmid, msg, length); | |
357 | switch (status.response_code) { | |
358 | case AP_RESPONSE_NORMAL: | |
359 | return 0; | |
360 | case AP_RESPONSE_NO_PENDING_REPLY: | |
361 | if (status.queue_empty) | |
362 | return -ENOENT; | |
363 | return -EBUSY; | |
af512ed0 RW |
364 | case AP_RESPONSE_RESET_IN_PROGRESS: |
365 | return -EBUSY; | |
1534c382 MS |
366 | default: |
367 | return -ENODEV; | |
368 | } | |
369 | } | |
370 | EXPORT_SYMBOL(ap_recv); | |
371 | ||
372 | /** | |
1749a81d FB |
373 | * ap_query_queue(): Check if an AP queue is available. |
374 | * @qid: The AP queue number | |
375 | * @queue_depth: Pointer to queue depth value | |
376 | * @device_type: Pointer to device type value | |
377 | * | |
378 | * The test is repeated for AP_MAX_RESET times. | |
1534c382 MS |
379 | */ |
380 | static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
381 | { | |
382 | struct ap_queue_status status; | |
383 | int t_depth, t_device_type, rc, i; | |
384 | ||
385 | rc = -EBUSY; | |
386 | for (i = 0; i < AP_MAX_RESET; i++) { | |
387 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
388 | switch (status.response_code) { | |
389 | case AP_RESPONSE_NORMAL: | |
390 | *queue_depth = t_depth + 1; | |
391 | *device_type = t_device_type; | |
392 | rc = 0; | |
393 | break; | |
394 | case AP_RESPONSE_Q_NOT_AVAIL: | |
395 | rc = -ENODEV; | |
396 | break; | |
397 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
398 | break; | |
399 | case AP_RESPONSE_DECONFIGURED: | |
400 | rc = -ENODEV; | |
401 | break; | |
402 | case AP_RESPONSE_CHECKSTOPPED: | |
403 | rc = -ENODEV; | |
404 | break; | |
cb17a636 FB |
405 | case AP_RESPONSE_INVALID_ADDRESS: |
406 | rc = -ENODEV; | |
407 | break; | |
408 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
409 | break; | |
1534c382 MS |
410 | case AP_RESPONSE_BUSY: |
411 | break; | |
412 | default: | |
413 | BUG(); | |
414 | } | |
415 | if (rc != -EBUSY) | |
416 | break; | |
417 | if (i < AP_MAX_RESET - 1) | |
418 | udelay(5); | |
419 | } | |
420 | return rc; | |
421 | } | |
422 | ||
423 | /** | |
1749a81d FB |
424 | * ap_init_queue(): Reset an AP queue. |
425 | * @qid: The AP queue number | |
426 | * | |
1534c382 | 427 | * Reset an AP queue and wait for it to become available again. |
1534c382 MS |
428 | */ |
429 | static int ap_init_queue(ap_qid_t qid) | |
430 | { | |
431 | struct ap_queue_status status; | |
432 | int rc, dummy, i; | |
433 | ||
434 | rc = -ENODEV; | |
435 | status = ap_reset_queue(qid); | |
436 | for (i = 0; i < AP_MAX_RESET; i++) { | |
437 | switch (status.response_code) { | |
438 | case AP_RESPONSE_NORMAL: | |
439 | if (status.queue_empty) | |
440 | rc = 0; | |
441 | break; | |
442 | case AP_RESPONSE_Q_NOT_AVAIL: | |
443 | case AP_RESPONSE_DECONFIGURED: | |
444 | case AP_RESPONSE_CHECKSTOPPED: | |
445 | i = AP_MAX_RESET; /* return with -ENODEV */ | |
446 | break; | |
447 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
af512ed0 | 448 | rc = -EBUSY; |
1534c382 MS |
449 | case AP_RESPONSE_BUSY: |
450 | default: | |
451 | break; | |
452 | } | |
af512ed0 | 453 | if (rc != -ENODEV && rc != -EBUSY) |
1534c382 MS |
454 | break; |
455 | if (i < AP_MAX_RESET - 1) { | |
456 | udelay(5); | |
457 | status = ap_test_queue(qid, &dummy, &dummy); | |
458 | } | |
459 | } | |
cb17a636 FB |
460 | if (rc == 0 && ap_using_interrupts()) { |
461 | rc = ap_queue_enable_interruption(qid, ap_interrupt_indicator); | |
462 | /* If interruption mode is supported by the machine, | |
463 | * but an AP can not be enabled for interruption then | |
464 | * the AP will be discarded. */ | |
465 | if (rc) | |
466 | pr_err("Registering adapter interrupts for " | |
467 | "AP %d failed\n", AP_QID_DEVICE(qid)); | |
468 | } | |
1534c382 MS |
469 | return rc; |
470 | } | |
471 | ||
af512ed0 | 472 | /** |
1749a81d FB |
473 | * ap_increase_queue_count(): Arm request timeout. |
474 | * @ap_dev: Pointer to an AP device. | |
475 | * | |
476 | * Arm request timeout if an AP device was idle and a new request is submitted. | |
af512ed0 RW |
477 | */ |
478 | static void ap_increase_queue_count(struct ap_device *ap_dev) | |
479 | { | |
480 | int timeout = ap_dev->drv->request_timeout; | |
481 | ||
482 | ap_dev->queue_count++; | |
483 | if (ap_dev->queue_count == 1) { | |
484 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
485 | ap_dev->reset = AP_RESET_ARMED; | |
486 | } | |
487 | } | |
488 | ||
489 | /** | |
1749a81d FB |
490 | * ap_decrease_queue_count(): Decrease queue count. |
491 | * @ap_dev: Pointer to an AP device. | |
492 | * | |
493 | * If AP device is still alive, re-schedule request timeout if there are still | |
af512ed0 RW |
494 | * pending requests. |
495 | */ | |
496 | static void ap_decrease_queue_count(struct ap_device *ap_dev) | |
497 | { | |
498 | int timeout = ap_dev->drv->request_timeout; | |
499 | ||
500 | ap_dev->queue_count--; | |
501 | if (ap_dev->queue_count > 0) | |
502 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
503 | else | |
1749a81d | 504 | /* |
af512ed0 RW |
505 | * The timeout timer should to be disabled now - since |
506 | * del_timer_sync() is very expensive, we just tell via the | |
507 | * reset flag to ignore the pending timeout timer. | |
508 | */ | |
509 | ap_dev->reset = AP_RESET_IGNORE; | |
510 | } | |
511 | ||
1749a81d | 512 | /* |
1534c382 MS |
513 | * AP device related attributes. |
514 | */ | |
515 | static ssize_t ap_hwtype_show(struct device *dev, | |
516 | struct device_attribute *attr, char *buf) | |
517 | { | |
518 | struct ap_device *ap_dev = to_ap_dev(dev); | |
519 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); | |
520 | } | |
521 | static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); | |
522 | ||
523 | static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr, | |
524 | char *buf) | |
525 | { | |
526 | struct ap_device *ap_dev = to_ap_dev(dev); | |
527 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth); | |
528 | } | |
529 | static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); | |
530 | ||
531 | static ssize_t ap_request_count_show(struct device *dev, | |
532 | struct device_attribute *attr, | |
533 | char *buf) | |
534 | { | |
535 | struct ap_device *ap_dev = to_ap_dev(dev); | |
536 | int rc; | |
537 | ||
538 | spin_lock_bh(&ap_dev->lock); | |
539 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count); | |
540 | spin_unlock_bh(&ap_dev->lock); | |
541 | return rc; | |
542 | } | |
543 | ||
544 | static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); | |
545 | ||
546 | static ssize_t ap_modalias_show(struct device *dev, | |
547 | struct device_attribute *attr, char *buf) | |
548 | { | |
549 | return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type); | |
550 | } | |
551 | ||
552 | static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); | |
553 | ||
554 | static struct attribute *ap_dev_attrs[] = { | |
555 | &dev_attr_hwtype.attr, | |
556 | &dev_attr_depth.attr, | |
557 | &dev_attr_request_count.attr, | |
558 | &dev_attr_modalias.attr, | |
559 | NULL | |
560 | }; | |
561 | static struct attribute_group ap_dev_attr_group = { | |
562 | .attrs = ap_dev_attrs | |
563 | }; | |
564 | ||
565 | /** | |
1749a81d FB |
566 | * ap_bus_match() |
567 | * @dev: Pointer to device | |
568 | * @drv: Pointer to device_driver | |
569 | * | |
1534c382 MS |
570 | * AP bus driver registration/unregistration. |
571 | */ | |
572 | static int ap_bus_match(struct device *dev, struct device_driver *drv) | |
573 | { | |
574 | struct ap_device *ap_dev = to_ap_dev(dev); | |
575 | struct ap_driver *ap_drv = to_ap_drv(drv); | |
576 | struct ap_device_id *id; | |
577 | ||
1749a81d | 578 | /* |
1534c382 MS |
579 | * Compare device type of the device with the list of |
580 | * supported types of the device_driver. | |
581 | */ | |
582 | for (id = ap_drv->ids; id->match_flags; id++) { | |
583 | if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) && | |
584 | (id->dev_type != ap_dev->device_type)) | |
585 | continue; | |
586 | return 1; | |
587 | } | |
588 | return 0; | |
589 | } | |
590 | ||
591 | /** | |
1749a81d FB |
592 | * ap_uevent(): Uevent function for AP devices. |
593 | * @dev: Pointer to device | |
594 | * @env: Pointer to kobj_uevent_env | |
595 | * | |
596 | * It sets up a single environment variable DEV_TYPE which contains the | |
597 | * hardware device type. | |
1534c382 | 598 | */ |
7eff2e7a | 599 | static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) |
1534c382 MS |
600 | { |
601 | struct ap_device *ap_dev = to_ap_dev(dev); | |
7eff2e7a | 602 | int retval = 0; |
1534c382 MS |
603 | |
604 | if (!ap_dev) | |
605 | return -ENODEV; | |
606 | ||
607 | /* Set up DEV_TYPE environment variable. */ | |
7eff2e7a | 608 | retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); |
bf62456e ER |
609 | if (retval) |
610 | return retval; | |
611 | ||
66a4263b | 612 | /* Add MODALIAS= */ |
7eff2e7a | 613 | retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); |
bf62456e | 614 | |
bf62456e | 615 | return retval; |
1534c382 MS |
616 | } |
617 | ||
618 | static struct bus_type ap_bus_type = { | |
619 | .name = "ap", | |
620 | .match = &ap_bus_match, | |
621 | .uevent = &ap_uevent, | |
622 | }; | |
623 | ||
624 | static int ap_device_probe(struct device *dev) | |
625 | { | |
626 | struct ap_device *ap_dev = to_ap_dev(dev); | |
627 | struct ap_driver *ap_drv = to_ap_drv(dev->driver); | |
628 | int rc; | |
629 | ||
630 | ap_dev->drv = ap_drv; | |
631 | rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; | |
faa582ca RW |
632 | if (!rc) { |
633 | spin_lock_bh(&ap_device_lock); | |
634 | list_add(&ap_dev->list, &ap_device_list); | |
635 | spin_unlock_bh(&ap_device_lock); | |
636 | } | |
1534c382 MS |
637 | return rc; |
638 | } | |
639 | ||
640 | /** | |
1749a81d FB |
641 | * __ap_flush_queue(): Flush requests. |
642 | * @ap_dev: Pointer to the AP device | |
643 | * | |
1534c382 | 644 | * Flush all requests from the request/pending queue of an AP device. |
1534c382 | 645 | */ |
4d284cac | 646 | static void __ap_flush_queue(struct ap_device *ap_dev) |
1534c382 MS |
647 | { |
648 | struct ap_message *ap_msg, *next; | |
649 | ||
650 | list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) { | |
651 | list_del_init(&ap_msg->list); | |
652 | ap_dev->pendingq_count--; | |
653 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
654 | } | |
655 | list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) { | |
656 | list_del_init(&ap_msg->list); | |
657 | ap_dev->requestq_count--; | |
658 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
659 | } | |
660 | } | |
661 | ||
662 | void ap_flush_queue(struct ap_device *ap_dev) | |
663 | { | |
664 | spin_lock_bh(&ap_dev->lock); | |
665 | __ap_flush_queue(ap_dev); | |
666 | spin_unlock_bh(&ap_dev->lock); | |
667 | } | |
668 | EXPORT_SYMBOL(ap_flush_queue); | |
669 | ||
670 | static int ap_device_remove(struct device *dev) | |
671 | { | |
672 | struct ap_device *ap_dev = to_ap_dev(dev); | |
673 | struct ap_driver *ap_drv = ap_dev->drv; | |
674 | ||
4e56296d | 675 | ap_flush_queue(ap_dev); |
af512ed0 | 676 | del_timer_sync(&ap_dev->timeout); |
cf352ce0 RW |
677 | spin_lock_bh(&ap_device_lock); |
678 | list_del_init(&ap_dev->list); | |
679 | spin_unlock_bh(&ap_device_lock); | |
faa582ca RW |
680 | if (ap_drv->remove) |
681 | ap_drv->remove(ap_dev); | |
e675c0d2 RW |
682 | spin_lock_bh(&ap_dev->lock); |
683 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
684 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
685 | return 0; |
686 | } | |
687 | ||
688 | int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, | |
689 | char *name) | |
690 | { | |
691 | struct device_driver *drv = &ap_drv->driver; | |
692 | ||
693 | drv->bus = &ap_bus_type; | |
694 | drv->probe = ap_device_probe; | |
695 | drv->remove = ap_device_remove; | |
696 | drv->owner = owner; | |
697 | drv->name = name; | |
698 | return driver_register(drv); | |
699 | } | |
700 | EXPORT_SYMBOL(ap_driver_register); | |
701 | ||
702 | void ap_driver_unregister(struct ap_driver *ap_drv) | |
703 | { | |
704 | driver_unregister(&ap_drv->driver); | |
705 | } | |
706 | EXPORT_SYMBOL(ap_driver_unregister); | |
707 | ||
1749a81d | 708 | /* |
1534c382 MS |
709 | * AP bus attributes. |
710 | */ | |
711 | static ssize_t ap_domain_show(struct bus_type *bus, char *buf) | |
712 | { | |
713 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); | |
714 | } | |
715 | ||
716 | static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL); | |
717 | ||
718 | static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) | |
719 | { | |
720 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); | |
721 | } | |
722 | ||
cb17a636 FB |
723 | static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) |
724 | { | |
725 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
726 | ap_using_interrupts() ? 1 : 0); | |
727 | } | |
728 | ||
729 | static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); | |
730 | ||
1534c382 MS |
731 | static ssize_t ap_config_time_store(struct bus_type *bus, |
732 | const char *buf, size_t count) | |
733 | { | |
734 | int time; | |
735 | ||
736 | if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) | |
737 | return -EINVAL; | |
738 | ap_config_time = time; | |
739 | if (!timer_pending(&ap_config_timer) || | |
740 | !mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) { | |
741 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
742 | add_timer(&ap_config_timer); | |
743 | } | |
744 | return count; | |
745 | } | |
746 | ||
747 | static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); | |
748 | ||
749 | static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) | |
750 | { | |
751 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); | |
752 | } | |
753 | ||
754 | static ssize_t ap_poll_thread_store(struct bus_type *bus, | |
755 | const char *buf, size_t count) | |
756 | { | |
757 | int flag, rc; | |
758 | ||
759 | if (sscanf(buf, "%d\n", &flag) != 1) | |
760 | return -EINVAL; | |
761 | if (flag) { | |
762 | rc = ap_poll_thread_start(); | |
763 | if (rc) | |
764 | return rc; | |
765 | } | |
766 | else | |
767 | ap_poll_thread_stop(); | |
768 | return count; | |
769 | } | |
770 | ||
771 | static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); | |
772 | ||
fe137230 FB |
773 | static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) |
774 | { | |
775 | return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); | |
776 | } | |
777 | ||
778 | static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, | |
779 | size_t count) | |
780 | { | |
781 | unsigned long long time; | |
782 | ktime_t hr_time; | |
783 | ||
784 | /* 120 seconds = maximum poll interval */ | |
cb17a636 FB |
785 | if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || |
786 | time > 120000000000ULL) | |
fe137230 FB |
787 | return -EINVAL; |
788 | poll_timeout = time; | |
789 | hr_time = ktime_set(0, poll_timeout); | |
790 | ||
791 | if (!hrtimer_is_queued(&ap_poll_timer) || | |
6c644eae AV |
792 | !hrtimer_forward(&ap_poll_timer, hrtimer_get_expires(&ap_poll_timer), hr_time)) { |
793 | hrtimer_set_expires(&ap_poll_timer, hr_time); | |
794 | hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); | |
fe137230 FB |
795 | } |
796 | return count; | |
797 | } | |
798 | ||
799 | static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); | |
800 | ||
1534c382 MS |
801 | static struct bus_attribute *const ap_bus_attrs[] = { |
802 | &bus_attr_ap_domain, | |
803 | &bus_attr_config_time, | |
804 | &bus_attr_poll_thread, | |
cb17a636 | 805 | &bus_attr_ap_interrupts, |
fe137230 FB |
806 | &bus_attr_poll_timeout, |
807 | NULL, | |
1534c382 MS |
808 | }; |
809 | ||
810 | /** | |
1749a81d FB |
811 | * ap_select_domain(): Select an AP domain. |
812 | * | |
813 | * Pick one of the 16 AP domains. | |
1534c382 | 814 | */ |
4d284cac | 815 | static int ap_select_domain(void) |
1534c382 MS |
816 | { |
817 | int queue_depth, device_type, count, max_count, best_domain; | |
818 | int rc, i, j; | |
819 | ||
1749a81d | 820 | /* |
1534c382 MS |
821 | * We want to use a single domain. Either the one specified with |
822 | * the "domain=" parameter or the domain with the maximum number | |
823 | * of devices. | |
824 | */ | |
825 | if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS) | |
826 | /* Domain has already been selected. */ | |
827 | return 0; | |
828 | best_domain = -1; | |
829 | max_count = 0; | |
830 | for (i = 0; i < AP_DOMAINS; i++) { | |
831 | count = 0; | |
832 | for (j = 0; j < AP_DEVICES; j++) { | |
833 | ap_qid_t qid = AP_MKQID(j, i); | |
834 | rc = ap_query_queue(qid, &queue_depth, &device_type); | |
835 | if (rc) | |
836 | continue; | |
837 | count++; | |
838 | } | |
839 | if (count > max_count) { | |
840 | max_count = count; | |
841 | best_domain = i; | |
842 | } | |
843 | } | |
844 | if (best_domain >= 0){ | |
845 | ap_domain_index = best_domain; | |
846 | return 0; | |
847 | } | |
848 | return -ENODEV; | |
849 | } | |
850 | ||
851 | /** | |
1749a81d | 852 | * ap_probe_device_type(): Find the device type of an AP. |
1534c382 | 853 | * @ap_dev: pointer to the AP device. |
1749a81d FB |
854 | * |
855 | * Find the device type if query queue returned a device type of 0. | |
1534c382 MS |
856 | */ |
857 | static int ap_probe_device_type(struct ap_device *ap_dev) | |
858 | { | |
859 | static unsigned char msg[] = { | |
860 | 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00, | |
861 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
862 | 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00, | |
863 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
864 | 0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50, | |
865 | 0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01, | |
866 | 0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00, | |
867 | 0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00, | |
868 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
869 | 0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00, | |
870 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
871 | 0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00, | |
872 | 0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00, | |
873 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
874 | 0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00, | |
875 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
876 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
877 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
878 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
879 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
880 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
881 | 0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00, | |
882 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
883 | 0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00, | |
884 | 0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20, | |
885 | 0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53, | |
886 | 0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22, | |
887 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
888 | 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88, | |
889 | 0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66, | |
890 | 0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44, | |
891 | 0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22, | |
892 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
893 | 0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77, | |
894 | 0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00, | |
895 | 0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00, | |
896 | 0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01, | |
897 | 0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c, | |
898 | 0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68, | |
899 | 0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66, | |
900 | 0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0, | |
901 | 0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8, | |
902 | 0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04, | |
903 | 0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57, | |
904 | 0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d, | |
905 | }; | |
906 | struct ap_queue_status status; | |
907 | unsigned long long psmid; | |
908 | char *reply; | |
909 | int rc, i; | |
910 | ||
911 | reply = (void *) get_zeroed_page(GFP_KERNEL); | |
912 | if (!reply) { | |
913 | rc = -ENOMEM; | |
914 | goto out; | |
915 | } | |
916 | ||
917 | status = __ap_send(ap_dev->qid, 0x0102030405060708ULL, | |
918 | msg, sizeof(msg)); | |
919 | if (status.response_code != AP_RESPONSE_NORMAL) { | |
920 | rc = -ENODEV; | |
921 | goto out_free; | |
922 | } | |
923 | ||
924 | /* Wait for the test message to complete. */ | |
925 | for (i = 0; i < 6; i++) { | |
926 | mdelay(300); | |
927 | status = __ap_recv(ap_dev->qid, &psmid, reply, 4096); | |
928 | if (status.response_code == AP_RESPONSE_NORMAL && | |
929 | psmid == 0x0102030405060708ULL) | |
930 | break; | |
931 | } | |
932 | if (i < 6) { | |
933 | /* Got an answer. */ | |
934 | if (reply[0] == 0x00 && reply[1] == 0x86) | |
935 | ap_dev->device_type = AP_DEVICE_TYPE_PCICC; | |
936 | else | |
937 | ap_dev->device_type = AP_DEVICE_TYPE_PCICA; | |
938 | rc = 0; | |
939 | } else | |
940 | rc = -ENODEV; | |
941 | ||
942 | out_free: | |
943 | free_page((unsigned long) reply); | |
944 | out: | |
945 | return rc; | |
946 | } | |
947 | ||
cb17a636 FB |
948 | static void ap_interrupt_handler(void *unused1, void *unused2) |
949 | { | |
950 | tasklet_schedule(&ap_tasklet); | |
951 | } | |
952 | ||
1534c382 | 953 | /** |
1749a81d FB |
954 | * __ap_scan_bus(): Scan the AP bus. |
955 | * @dev: Pointer to device | |
956 | * @data: Pointer to data | |
957 | * | |
958 | * Scan the AP bus for new devices. | |
1534c382 MS |
959 | */ |
960 | static int __ap_scan_bus(struct device *dev, void *data) | |
961 | { | |
962 | return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data; | |
963 | } | |
964 | ||
965 | static void ap_device_release(struct device *dev) | |
966 | { | |
967 | struct ap_device *ap_dev = to_ap_dev(dev); | |
968 | ||
969 | kfree(ap_dev); | |
970 | } | |
971 | ||
4927b3f7 | 972 | static void ap_scan_bus(struct work_struct *unused) |
1534c382 MS |
973 | { |
974 | struct ap_device *ap_dev; | |
975 | struct device *dev; | |
976 | ap_qid_t qid; | |
977 | int queue_depth, device_type; | |
978 | int rc, i; | |
979 | ||
980 | if (ap_select_domain() != 0) | |
981 | return; | |
982 | for (i = 0; i < AP_DEVICES; i++) { | |
983 | qid = AP_MKQID(i, ap_domain_index); | |
984 | dev = bus_find_device(&ap_bus_type, NULL, | |
985 | (void *)(unsigned long)qid, | |
986 | __ap_scan_bus); | |
f3b017d8 | 987 | rc = ap_query_queue(qid, &queue_depth, &device_type); |
c6a48264 | 988 | if (dev) { |
af512ed0 RW |
989 | if (rc == -EBUSY) { |
990 | set_current_state(TASK_UNINTERRUPTIBLE); | |
991 | schedule_timeout(AP_RESET_TIMEOUT); | |
992 | rc = ap_query_queue(qid, &queue_depth, | |
993 | &device_type); | |
994 | } | |
c6a48264 RW |
995 | ap_dev = to_ap_dev(dev); |
996 | spin_lock_bh(&ap_dev->lock); | |
997 | if (rc || ap_dev->unregistered) { | |
998 | spin_unlock_bh(&ap_dev->lock); | |
c6a48264 | 999 | device_unregister(dev); |
af512ed0 | 1000 | put_device(dev); |
c6a48264 | 1001 | continue; |
af512ed0 RW |
1002 | } |
1003 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
1004 | put_device(dev); |
1005 | continue; | |
1006 | } | |
1534c382 MS |
1007 | if (rc) |
1008 | continue; | |
1009 | rc = ap_init_queue(qid); | |
1010 | if (rc) | |
1011 | continue; | |
1012 | ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL); | |
1013 | if (!ap_dev) | |
1014 | break; | |
1015 | ap_dev->qid = qid; | |
1016 | ap_dev->queue_depth = queue_depth; | |
4e56296d | 1017 | ap_dev->unregistered = 1; |
1534c382 MS |
1018 | spin_lock_init(&ap_dev->lock); |
1019 | INIT_LIST_HEAD(&ap_dev->pendingq); | |
1020 | INIT_LIST_HEAD(&ap_dev->requestq); | |
cf352ce0 | 1021 | INIT_LIST_HEAD(&ap_dev->list); |
af512ed0 RW |
1022 | setup_timer(&ap_dev->timeout, ap_request_timeout, |
1023 | (unsigned long) ap_dev); | |
1534c382 MS |
1024 | if (device_type == 0) |
1025 | ap_probe_device_type(ap_dev); | |
1026 | else | |
1027 | ap_dev->device_type = device_type; | |
1028 | ||
1029 | ap_dev->device.bus = &ap_bus_type; | |
1030 | ap_dev->device.parent = ap_root_device; | |
1bf5b285 CH |
1031 | dev_set_name(&ap_dev->device, "card%02x", |
1032 | AP_QID_DEVICE(ap_dev->qid)); | |
1534c382 MS |
1033 | ap_dev->device.release = ap_device_release; |
1034 | rc = device_register(&ap_dev->device); | |
1035 | if (rc) { | |
1036 | kfree(ap_dev); | |
1037 | continue; | |
1038 | } | |
1039 | /* Add device attributes. */ | |
1040 | rc = sysfs_create_group(&ap_dev->device.kobj, | |
1041 | &ap_dev_attr_group); | |
4e56296d RW |
1042 | if (!rc) { |
1043 | spin_lock_bh(&ap_dev->lock); | |
1044 | ap_dev->unregistered = 0; | |
1045 | spin_unlock_bh(&ap_dev->lock); | |
1046 | } | |
1047 | else | |
1534c382 MS |
1048 | device_unregister(&ap_dev->device); |
1049 | } | |
1050 | } | |
1051 | ||
1052 | static void | |
1053 | ap_config_timeout(unsigned long ptr) | |
1054 | { | |
1055 | queue_work(ap_work_queue, &ap_config_work); | |
1056 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1057 | add_timer(&ap_config_timer); | |
1058 | } | |
1059 | ||
1060 | /** | |
1749a81d FB |
1061 | * ap_schedule_poll_timer(): Schedule poll timer. |
1062 | * | |
1534c382 MS |
1063 | * Set up the timer to run the poll tasklet |
1064 | */ | |
1065 | static inline void ap_schedule_poll_timer(void) | |
1066 | { | |
cb17a636 FB |
1067 | if (ap_using_interrupts()) |
1068 | return; | |
fe137230 | 1069 | if (hrtimer_is_queued(&ap_poll_timer)) |
1534c382 | 1070 | return; |
fe137230 FB |
1071 | hrtimer_start(&ap_poll_timer, ktime_set(0, poll_timeout), |
1072 | HRTIMER_MODE_ABS); | |
1534c382 MS |
1073 | } |
1074 | ||
1075 | /** | |
1749a81d | 1076 | * ap_poll_read(): Receive pending reply messages from an AP device. |
1534c382 MS |
1077 | * @ap_dev: pointer to the AP device |
1078 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1079 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1080 | * |
1534c382 MS |
1081 | * Returns 0 if the device is still present, -ENODEV if not. |
1082 | */ | |
4d284cac | 1083 | static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1084 | { |
1085 | struct ap_queue_status status; | |
1086 | struct ap_message *ap_msg; | |
1087 | ||
1088 | if (ap_dev->queue_count <= 0) | |
1089 | return 0; | |
1090 | status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid, | |
1091 | ap_dev->reply->message, ap_dev->reply->length); | |
1092 | switch (status.response_code) { | |
1093 | case AP_RESPONSE_NORMAL: | |
1094 | atomic_dec(&ap_poll_requests); | |
af512ed0 | 1095 | ap_decrease_queue_count(ap_dev); |
1534c382 MS |
1096 | list_for_each_entry(ap_msg, &ap_dev->pendingq, list) { |
1097 | if (ap_msg->psmid != ap_dev->reply->psmid) | |
1098 | continue; | |
1099 | list_del_init(&ap_msg->list); | |
1100 | ap_dev->pendingq_count--; | |
1101 | ap_dev->drv->receive(ap_dev, ap_msg, ap_dev->reply); | |
1102 | break; | |
1103 | } | |
1104 | if (ap_dev->queue_count > 0) | |
1105 | *flags |= 1; | |
1106 | break; | |
1107 | case AP_RESPONSE_NO_PENDING_REPLY: | |
1108 | if (status.queue_empty) { | |
1109 | /* The card shouldn't forget requests but who knows. */ | |
e675c0d2 | 1110 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); |
1534c382 MS |
1111 | ap_dev->queue_count = 0; |
1112 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1113 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1114 | ap_dev->pendingq_count = 0; | |
1115 | } else | |
1116 | *flags |= 2; | |
1117 | break; | |
1118 | default: | |
1119 | return -ENODEV; | |
1120 | } | |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | /** | |
1749a81d | 1125 | * ap_poll_write(): Send messages from the request queue to an AP device. |
1534c382 MS |
1126 | * @ap_dev: pointer to the AP device |
1127 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1128 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1129 | * |
1534c382 MS |
1130 | * Returns 0 if the device is still present, -ENODEV if not. |
1131 | */ | |
4d284cac | 1132 | static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1133 | { |
1134 | struct ap_queue_status status; | |
1135 | struct ap_message *ap_msg; | |
1136 | ||
1137 | if (ap_dev->requestq_count <= 0 || | |
1138 | ap_dev->queue_count >= ap_dev->queue_depth) | |
1139 | return 0; | |
1140 | /* Start the next request on the queue. */ | |
1141 | ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list); | |
1142 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
1143 | ap_msg->message, ap_msg->length); | |
1144 | switch (status.response_code) { | |
1145 | case AP_RESPONSE_NORMAL: | |
1146 | atomic_inc(&ap_poll_requests); | |
af512ed0 | 1147 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1148 | list_move_tail(&ap_msg->list, &ap_dev->pendingq); |
1149 | ap_dev->requestq_count--; | |
1150 | ap_dev->pendingq_count++; | |
1151 | if (ap_dev->queue_count < ap_dev->queue_depth && | |
1152 | ap_dev->requestq_count > 0) | |
1153 | *flags |= 1; | |
1154 | *flags |= 2; | |
1155 | break; | |
1156 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1157 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1158 | *flags |= 2; |
1159 | break; | |
1160 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
1161 | return -EINVAL; | |
1162 | default: | |
1163 | return -ENODEV; | |
1164 | } | |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | /** | |
1749a81d | 1169 | * ap_poll_queue(): Poll AP device for pending replies and send new messages. |
1534c382 MS |
1170 | * @ap_dev: pointer to the bus device |
1171 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1172 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d FB |
1173 | * |
1174 | * Poll AP device for pending replies and send new messages. If either | |
1175 | * ap_poll_read or ap_poll_write returns -ENODEV unregister the device. | |
1534c382 MS |
1176 | * Returns 0. |
1177 | */ | |
1178 | static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags) | |
1179 | { | |
1180 | int rc; | |
1181 | ||
1182 | rc = ap_poll_read(ap_dev, flags); | |
1183 | if (rc) | |
1184 | return rc; | |
1185 | return ap_poll_write(ap_dev, flags); | |
1186 | } | |
1187 | ||
1188 | /** | |
1749a81d | 1189 | * __ap_queue_message(): Queue a message to a device. |
1534c382 MS |
1190 | * @ap_dev: pointer to the AP device |
1191 | * @ap_msg: the message to be queued | |
1749a81d FB |
1192 | * |
1193 | * Queue a message to a device. Returns 0 if successful. | |
1534c382 MS |
1194 | */ |
1195 | static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1196 | { | |
1197 | struct ap_queue_status status; | |
1198 | ||
1199 | if (list_empty(&ap_dev->requestq) && | |
1200 | ap_dev->queue_count < ap_dev->queue_depth) { | |
1201 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
1202 | ap_msg->message, ap_msg->length); | |
1203 | switch (status.response_code) { | |
1204 | case AP_RESPONSE_NORMAL: | |
1205 | list_add_tail(&ap_msg->list, &ap_dev->pendingq); | |
1206 | atomic_inc(&ap_poll_requests); | |
1207 | ap_dev->pendingq_count++; | |
af512ed0 | 1208 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1209 | ap_dev->total_request_count++; |
1210 | break; | |
1211 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1212 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1213 | list_add_tail(&ap_msg->list, &ap_dev->requestq); |
1214 | ap_dev->requestq_count++; | |
1215 | ap_dev->total_request_count++; | |
1216 | return -EBUSY; | |
1217 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
1218 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL)); | |
1219 | return -EINVAL; | |
1220 | default: /* Device is gone. */ | |
1221 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
1222 | return -ENODEV; | |
1223 | } | |
1224 | } else { | |
1225 | list_add_tail(&ap_msg->list, &ap_dev->requestq); | |
1226 | ap_dev->requestq_count++; | |
1227 | ap_dev->total_request_count++; | |
1228 | return -EBUSY; | |
1229 | } | |
1230 | ap_schedule_poll_timer(); | |
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1235 | { | |
1236 | unsigned long flags; | |
1237 | int rc; | |
1238 | ||
1239 | spin_lock_bh(&ap_dev->lock); | |
1240 | if (!ap_dev->unregistered) { | |
1241 | /* Make room on the queue by polling for finished requests. */ | |
1242 | rc = ap_poll_queue(ap_dev, &flags); | |
1243 | if (!rc) | |
1244 | rc = __ap_queue_message(ap_dev, ap_msg); | |
1245 | if (!rc) | |
1246 | wake_up(&ap_poll_wait); | |
4e56296d RW |
1247 | if (rc == -ENODEV) |
1248 | ap_dev->unregistered = 1; | |
1534c382 MS |
1249 | } else { |
1250 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
c6a48264 | 1251 | rc = -ENODEV; |
1534c382 MS |
1252 | } |
1253 | spin_unlock_bh(&ap_dev->lock); | |
1254 | if (rc == -ENODEV) | |
1255 | device_unregister(&ap_dev->device); | |
1256 | } | |
1257 | EXPORT_SYMBOL(ap_queue_message); | |
1258 | ||
1259 | /** | |
1749a81d FB |
1260 | * ap_cancel_message(): Cancel a crypto request. |
1261 | * @ap_dev: The AP device that has the message queued | |
1262 | * @ap_msg: The message that is to be removed | |
1263 | * | |
1534c382 | 1264 | * Cancel a crypto request. This is done by removing the request |
1749a81d | 1265 | * from the device pending or request queue. Note that the |
1534c382 MS |
1266 | * request stays on the AP queue. When it finishes the message |
1267 | * reply will be discarded because the psmid can't be found. | |
1534c382 MS |
1268 | */ |
1269 | void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1270 | { | |
1271 | struct ap_message *tmp; | |
1272 | ||
1273 | spin_lock_bh(&ap_dev->lock); | |
1274 | if (!list_empty(&ap_msg->list)) { | |
1275 | list_for_each_entry(tmp, &ap_dev->pendingq, list) | |
1276 | if (tmp->psmid == ap_msg->psmid) { | |
1277 | ap_dev->pendingq_count--; | |
1278 | goto found; | |
1279 | } | |
1280 | ap_dev->requestq_count--; | |
1281 | found: | |
1282 | list_del_init(&ap_msg->list); | |
1283 | } | |
1284 | spin_unlock_bh(&ap_dev->lock); | |
1285 | } | |
1286 | EXPORT_SYMBOL(ap_cancel_message); | |
1287 | ||
1288 | /** | |
1749a81d | 1289 | * ap_poll_timeout(): AP receive polling for finished AP requests. |
fe137230 | 1290 | * @unused: Unused pointer. |
1749a81d | 1291 | * |
fe137230 | 1292 | * Schedules the AP tasklet using a high resolution timer. |
1534c382 | 1293 | */ |
fe137230 | 1294 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) |
1534c382 MS |
1295 | { |
1296 | tasklet_schedule(&ap_tasklet); | |
fe137230 | 1297 | return HRTIMER_NORESTART; |
1534c382 MS |
1298 | } |
1299 | ||
af512ed0 | 1300 | /** |
1749a81d FB |
1301 | * ap_reset(): Reset a not responding AP device. |
1302 | * @ap_dev: Pointer to the AP device | |
1303 | * | |
af512ed0 RW |
1304 | * Reset a not responding AP device and move all requests from the |
1305 | * pending queue to the request queue. | |
1306 | */ | |
1307 | static void ap_reset(struct ap_device *ap_dev) | |
1308 | { | |
1309 | int rc; | |
1310 | ||
1311 | ap_dev->reset = AP_RESET_IGNORE; | |
1312 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
1313 | ap_dev->queue_count = 0; | |
1314 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1315 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1316 | ap_dev->pendingq_count = 0; | |
1317 | rc = ap_init_queue(ap_dev->qid); | |
1318 | if (rc == -ENODEV) | |
1319 | ap_dev->unregistered = 1; | |
1320 | } | |
1321 | ||
cf352ce0 | 1322 | static int __ap_poll_all(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 | 1323 | { |
1534c382 MS |
1324 | spin_lock(&ap_dev->lock); |
1325 | if (!ap_dev->unregistered) { | |
c6a48264 | 1326 | if (ap_poll_queue(ap_dev, flags)) |
4e56296d | 1327 | ap_dev->unregistered = 1; |
af512ed0 RW |
1328 | if (ap_dev->reset == AP_RESET_DO) |
1329 | ap_reset(ap_dev); | |
c6a48264 | 1330 | } |
1534c382 | 1331 | spin_unlock(&ap_dev->lock); |
1534c382 MS |
1332 | return 0; |
1333 | } | |
1334 | ||
1749a81d FB |
1335 | /** |
1336 | * ap_poll_all(): Poll all AP devices. | |
1337 | * @dummy: Unused variable | |
1338 | * | |
1339 | * Poll all AP devices on the bus in a round robin fashion. Continue | |
1340 | * polling until bit 2^0 of the control flags is not set. If bit 2^1 | |
1341 | * of the control flags has been set arm the poll timer. | |
1342 | */ | |
1534c382 MS |
1343 | static void ap_poll_all(unsigned long dummy) |
1344 | { | |
1345 | unsigned long flags; | |
cf352ce0 | 1346 | struct ap_device *ap_dev; |
1534c382 | 1347 | |
cb17a636 FB |
1348 | /* Reset the indicator if interrupts are used. Thus new interrupts can |
1349 | * be received. Doing it in the beginning of the tasklet is therefor | |
1350 | * important that no requests on any AP get lost. | |
1351 | */ | |
1352 | if (ap_using_interrupts()) | |
1353 | xchg((u8 *)ap_interrupt_indicator, 0); | |
1534c382 MS |
1354 | do { |
1355 | flags = 0; | |
cf352ce0 RW |
1356 | spin_lock(&ap_device_lock); |
1357 | list_for_each_entry(ap_dev, &ap_device_list, list) { | |
1358 | __ap_poll_all(ap_dev, &flags); | |
1359 | } | |
1360 | spin_unlock(&ap_device_lock); | |
1534c382 MS |
1361 | } while (flags & 1); |
1362 | if (flags & 2) | |
1363 | ap_schedule_poll_timer(); | |
1364 | } | |
1365 | ||
1366 | /** | |
1749a81d FB |
1367 | * ap_poll_thread(): Thread that polls for finished requests. |
1368 | * @data: Unused pointer | |
1369 | * | |
1534c382 MS |
1370 | * AP bus poll thread. The purpose of this thread is to poll for |
1371 | * finished requests in a loop if there is a "free" cpu - that is | |
1372 | * a cpu that doesn't have anything better to do. The polling stops | |
1373 | * as soon as there is another task or if all messages have been | |
1374 | * delivered. | |
1375 | */ | |
1376 | static int ap_poll_thread(void *data) | |
1377 | { | |
1378 | DECLARE_WAITQUEUE(wait, current); | |
1379 | unsigned long flags; | |
1380 | int requests; | |
cf352ce0 | 1381 | struct ap_device *ap_dev; |
1534c382 | 1382 | |
d83682b3 | 1383 | set_user_nice(current, 19); |
1534c382 MS |
1384 | while (1) { |
1385 | if (need_resched()) { | |
1386 | schedule(); | |
1387 | continue; | |
1388 | } | |
1389 | add_wait_queue(&ap_poll_wait, &wait); | |
1390 | set_current_state(TASK_INTERRUPTIBLE); | |
1391 | if (kthread_should_stop()) | |
1392 | break; | |
1393 | requests = atomic_read(&ap_poll_requests); | |
1394 | if (requests <= 0) | |
1395 | schedule(); | |
1396 | set_current_state(TASK_RUNNING); | |
1397 | remove_wait_queue(&ap_poll_wait, &wait); | |
1398 | ||
1534c382 | 1399 | flags = 0; |
cf352ce0 RW |
1400 | spin_lock_bh(&ap_device_lock); |
1401 | list_for_each_entry(ap_dev, &ap_device_list, list) { | |
1402 | __ap_poll_all(ap_dev, &flags); | |
1403 | } | |
1404 | spin_unlock_bh(&ap_device_lock); | |
1534c382 MS |
1405 | } |
1406 | set_current_state(TASK_RUNNING); | |
1407 | remove_wait_queue(&ap_poll_wait, &wait); | |
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | static int ap_poll_thread_start(void) | |
1412 | { | |
1413 | int rc; | |
1414 | ||
cb17a636 FB |
1415 | if (ap_using_interrupts()) |
1416 | return 0; | |
1534c382 MS |
1417 | mutex_lock(&ap_poll_thread_mutex); |
1418 | if (!ap_poll_kthread) { | |
1419 | ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); | |
1420 | rc = IS_ERR(ap_poll_kthread) ? PTR_ERR(ap_poll_kthread) : 0; | |
1421 | if (rc) | |
1422 | ap_poll_kthread = NULL; | |
1423 | } | |
1424 | else | |
1425 | rc = 0; | |
1426 | mutex_unlock(&ap_poll_thread_mutex); | |
1427 | return rc; | |
1428 | } | |
1429 | ||
1430 | static void ap_poll_thread_stop(void) | |
1431 | { | |
1432 | mutex_lock(&ap_poll_thread_mutex); | |
1433 | if (ap_poll_kthread) { | |
1434 | kthread_stop(ap_poll_kthread); | |
1435 | ap_poll_kthread = NULL; | |
1436 | } | |
1437 | mutex_unlock(&ap_poll_thread_mutex); | |
1438 | } | |
1439 | ||
af512ed0 | 1440 | /** |
1749a81d FB |
1441 | * ap_request_timeout(): Handling of request timeouts |
1442 | * @data: Holds the AP device. | |
1443 | * | |
1444 | * Handles request timeouts. | |
af512ed0 RW |
1445 | */ |
1446 | static void ap_request_timeout(unsigned long data) | |
1447 | { | |
1448 | struct ap_device *ap_dev = (struct ap_device *) data; | |
1449 | ||
cb17a636 | 1450 | if (ap_dev->reset == AP_RESET_ARMED) { |
af512ed0 | 1451 | ap_dev->reset = AP_RESET_DO; |
cb17a636 FB |
1452 | |
1453 | if (ap_using_interrupts()) | |
1454 | tasklet_schedule(&ap_tasklet); | |
1455 | } | |
af512ed0 RW |
1456 | } |
1457 | ||
13e742ba RW |
1458 | static void ap_reset_domain(void) |
1459 | { | |
1460 | int i; | |
1461 | ||
39aa7cf6 RW |
1462 | if (ap_domain_index != -1) |
1463 | for (i = 0; i < AP_DEVICES; i++) | |
1464 | ap_reset_queue(AP_MKQID(i, ap_domain_index)); | |
13e742ba RW |
1465 | } |
1466 | ||
1467 | static void ap_reset_all(void) | |
85eca850 RW |
1468 | { |
1469 | int i, j; | |
1470 | ||
1471 | for (i = 0; i < AP_DOMAINS; i++) | |
1472 | for (j = 0; j < AP_DEVICES; j++) | |
1473 | ap_reset_queue(AP_MKQID(j, i)); | |
1474 | } | |
1475 | ||
1476 | static struct reset_call ap_reset_call = { | |
13e742ba | 1477 | .fn = ap_reset_all, |
85eca850 RW |
1478 | }; |
1479 | ||
1534c382 | 1480 | /** |
1749a81d FB |
1481 | * ap_module_init(): The module initialization code. |
1482 | * | |
1483 | * Initializes the module. | |
1534c382 MS |
1484 | */ |
1485 | int __init ap_module_init(void) | |
1486 | { | |
1487 | int rc, i; | |
1488 | ||
1489 | if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) { | |
1490 | printk(KERN_WARNING "Invalid param: domain = %d. " | |
1491 | " Not loading.\n", ap_domain_index); | |
1492 | return -EINVAL; | |
1493 | } | |
1494 | if (ap_instructions_available() != 0) { | |
1495 | printk(KERN_WARNING "AP instructions not installed.\n"); | |
1496 | return -ENODEV; | |
1497 | } | |
cb17a636 FB |
1498 | if (ap_interrupts_available()) { |
1499 | isc_register(AP_ISC); | |
1500 | ap_interrupt_indicator = s390_register_adapter_interrupt( | |
1501 | &ap_interrupt_handler, NULL, AP_ISC); | |
1502 | if (IS_ERR(ap_interrupt_indicator)) { | |
1503 | ap_interrupt_indicator = NULL; | |
1504 | isc_unregister(AP_ISC); | |
1505 | } | |
1506 | } | |
1507 | ||
85eca850 | 1508 | register_reset_call(&ap_reset_call); |
1534c382 MS |
1509 | |
1510 | /* Create /sys/bus/ap. */ | |
1511 | rc = bus_register(&ap_bus_type); | |
1512 | if (rc) | |
1513 | goto out; | |
1514 | for (i = 0; ap_bus_attrs[i]; i++) { | |
1515 | rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); | |
1516 | if (rc) | |
1517 | goto out_bus; | |
1518 | } | |
1519 | ||
1520 | /* Create /sys/devices/ap. */ | |
1521 | ap_root_device = s390_root_dev_register("ap"); | |
1522 | rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0; | |
1523 | if (rc) | |
1524 | goto out_bus; | |
1525 | ||
1526 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
1527 | if (!ap_work_queue) { | |
1528 | rc = -ENOMEM; | |
1529 | goto out_root; | |
1530 | } | |
1531 | ||
1532 | if (ap_select_domain() == 0) | |
1533 | ap_scan_bus(NULL); | |
1534 | ||
1749a81d | 1535 | /* Setup the AP bus rescan timer. */ |
1534c382 MS |
1536 | init_timer(&ap_config_timer); |
1537 | ap_config_timer.function = ap_config_timeout; | |
1538 | ap_config_timer.data = 0; | |
1539 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1540 | add_timer(&ap_config_timer); | |
1541 | ||
fe137230 FB |
1542 | /* Setup the high resultion poll timer. |
1543 | * If we are running under z/VM adjust polling to z/VM polling rate. | |
1544 | */ | |
1545 | if (MACHINE_IS_VM) | |
1546 | poll_timeout = 1500000; | |
1547 | hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
1548 | ap_poll_timer.function = ap_poll_timeout; | |
1549 | ||
1534c382 MS |
1550 | /* Start the low priority AP bus poll thread. */ |
1551 | if (ap_thread_flag) { | |
1552 | rc = ap_poll_thread_start(); | |
1553 | if (rc) | |
1554 | goto out_work; | |
1555 | } | |
1556 | ||
1557 | return 0; | |
1558 | ||
1559 | out_work: | |
1560 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1561 | hrtimer_cancel(&ap_poll_timer); |
1534c382 MS |
1562 | destroy_workqueue(ap_work_queue); |
1563 | out_root: | |
1564 | s390_root_dev_unregister(ap_root_device); | |
1565 | out_bus: | |
1566 | while (i--) | |
1567 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1568 | bus_unregister(&ap_bus_type); | |
1569 | out: | |
85eca850 | 1570 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1571 | if (ap_using_interrupts()) { |
1572 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1573 | isc_unregister(AP_ISC); | |
1574 | } | |
1534c382 MS |
1575 | return rc; |
1576 | } | |
1577 | ||
1578 | static int __ap_match_all(struct device *dev, void *data) | |
1579 | { | |
1580 | return 1; | |
1581 | } | |
1582 | ||
1583 | /** | |
1749a81d FB |
1584 | * ap_modules_exit(): The module termination code |
1585 | * | |
1586 | * Terminates the module. | |
1534c382 MS |
1587 | */ |
1588 | void ap_module_exit(void) | |
1589 | { | |
1590 | int i; | |
1591 | struct device *dev; | |
1592 | ||
13e742ba | 1593 | ap_reset_domain(); |
1534c382 MS |
1594 | ap_poll_thread_stop(); |
1595 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1596 | hrtimer_cancel(&ap_poll_timer); |
1534c382 | 1597 | destroy_workqueue(ap_work_queue); |
13e742ba | 1598 | tasklet_kill(&ap_tasklet); |
1534c382 MS |
1599 | s390_root_dev_unregister(ap_root_device); |
1600 | while ((dev = bus_find_device(&ap_bus_type, NULL, NULL, | |
1601 | __ap_match_all))) | |
1602 | { | |
1603 | device_unregister(dev); | |
1604 | put_device(dev); | |
1605 | } | |
1606 | for (i = 0; ap_bus_attrs[i]; i++) | |
1607 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1608 | bus_unregister(&ap_bus_type); | |
85eca850 | 1609 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1610 | if (ap_using_interrupts()) { |
1611 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1612 | isc_unregister(AP_ISC); | |
1613 | } | |
1534c382 MS |
1614 | } |
1615 | ||
1616 | #ifndef CONFIG_ZCRYPT_MONOLITHIC | |
1617 | module_init(ap_module_init); | |
1618 | module_exit(ap_module_exit); | |
1619 | #endif |