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1534c382 MS |
1 | /* |
2 | * linux/drivers/s390/crypto/ap_bus.c | |
3 | * | |
4 | * Copyright (C) 2006 IBM Corporation | |
5 | * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Ralph Wuerthner <rwuerthn@de.ibm.com> | |
cb17a636 | 8 | * Felix Beck <felix.beck@de.ibm.com> |
1534c382 MS |
9 | * |
10 | * Adjunct processor bus. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2, or (at your option) | |
15 | * any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | */ | |
26 | ||
136f7a1c MS |
27 | #define KMSG_COMPONENT "ap" |
28 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
29 | ||
1534c382 MS |
30 | #include <linux/module.h> |
31 | #include <linux/init.h> | |
32 | #include <linux/delay.h> | |
33 | #include <linux/err.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/workqueue.h> | |
36 | #include <linux/notifier.h> | |
37 | #include <linux/kthread.h> | |
38 | #include <linux/mutex.h> | |
85eca850 | 39 | #include <asm/reset.h> |
cb17a636 FB |
40 | #include <asm/airq.h> |
41 | #include <asm/atomic.h> | |
42 | #include <asm/system.h> | |
43 | #include <asm/isc.h> | |
fe137230 FB |
44 | #include <linux/hrtimer.h> |
45 | #include <linux/ktime.h> | |
1534c382 MS |
46 | |
47 | #include "ap_bus.h" | |
48 | ||
49 | /* Some prototypes. */ | |
4927b3f7 | 50 | static void ap_scan_bus(struct work_struct *); |
1534c382 | 51 | static void ap_poll_all(unsigned long); |
fe137230 | 52 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *); |
1534c382 MS |
53 | static int ap_poll_thread_start(void); |
54 | static void ap_poll_thread_stop(void); | |
af512ed0 | 55 | static void ap_request_timeout(unsigned long); |
cb17a636 | 56 | static inline void ap_schedule_poll_timer(void); |
772f5472 FB |
57 | static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags); |
58 | static int ap_device_remove(struct device *dev); | |
59 | static int ap_device_probe(struct device *dev); | |
60 | static void ap_interrupt_handler(void *unused1, void *unused2); | |
61 | static void ap_reset(struct ap_device *ap_dev); | |
62 | static void ap_config_timeout(unsigned long ptr); | |
5314af69 | 63 | static int ap_select_domain(void); |
1534c382 | 64 | |
1749a81d | 65 | /* |
1534c382 MS |
66 | * Module description. |
67 | */ | |
68 | MODULE_AUTHOR("IBM Corporation"); | |
69 | MODULE_DESCRIPTION("Adjunct Processor Bus driver, " | |
70 | "Copyright 2006 IBM Corporation"); | |
71 | MODULE_LICENSE("GPL"); | |
72 | ||
1749a81d | 73 | /* |
1534c382 MS |
74 | * Module parameter |
75 | */ | |
76 | int ap_domain_index = -1; /* Adjunct Processor Domain Index */ | |
77 | module_param_named(domain, ap_domain_index, int, 0000); | |
78 | MODULE_PARM_DESC(domain, "domain index for ap devices"); | |
79 | EXPORT_SYMBOL(ap_domain_index); | |
80 | ||
b90b34c6 | 81 | static int ap_thread_flag = 0; |
1534c382 | 82 | module_param_named(poll_thread, ap_thread_flag, int, 0000); |
b90b34c6 | 83 | MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); |
1534c382 MS |
84 | |
85 | static struct device *ap_root_device = NULL; | |
43c207e6 | 86 | static DEFINE_SPINLOCK(ap_device_list_lock); |
cf352ce0 | 87 | static LIST_HEAD(ap_device_list); |
1534c382 | 88 | |
1749a81d | 89 | /* |
1534c382 MS |
90 | * Workqueue & timer for bus rescan. |
91 | */ | |
92 | static struct workqueue_struct *ap_work_queue; | |
93 | static struct timer_list ap_config_timer; | |
94 | static int ap_config_time = AP_CONFIG_TIME; | |
4927b3f7 | 95 | static DECLARE_WORK(ap_config_work, ap_scan_bus); |
1534c382 | 96 | |
1749a81d | 97 | /* |
cb17a636 | 98 | * Tasklet & timer for AP request polling and interrupts |
1534c382 | 99 | */ |
1534c382 MS |
100 | static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0); |
101 | static atomic_t ap_poll_requests = ATOMIC_INIT(0); | |
102 | static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); | |
103 | static struct task_struct *ap_poll_kthread = NULL; | |
104 | static DEFINE_MUTEX(ap_poll_thread_mutex); | |
93521314 | 105 | static DEFINE_SPINLOCK(ap_poll_timer_lock); |
cb17a636 | 106 | static void *ap_interrupt_indicator; |
fe137230 FB |
107 | static struct hrtimer ap_poll_timer; |
108 | /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. | |
109 | * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ | |
110 | static unsigned long long poll_timeout = 250000; | |
1534c382 | 111 | |
772f5472 FB |
112 | /* Suspend flag */ |
113 | static int ap_suspend_flag; | |
5314af69 FB |
114 | /* Flag to check if domain was set through module parameter domain=. This is |
115 | * important when supsend and resume is done in a z/VM environment where the | |
116 | * domain might change. */ | |
117 | static int user_set_domain = 0; | |
772f5472 FB |
118 | static struct bus_type ap_bus_type; |
119 | ||
cb17a636 FB |
120 | /** |
121 | * ap_using_interrupts() - Returns non-zero if interrupt support is | |
122 | * available. | |
123 | */ | |
124 | static inline int ap_using_interrupts(void) | |
125 | { | |
126 | return ap_interrupt_indicator != NULL; | |
127 | } | |
128 | ||
1534c382 | 129 | /** |
1749a81d | 130 | * ap_intructions_available() - Test if AP instructions are available. |
1534c382 | 131 | * |
1749a81d | 132 | * Returns 0 if the AP instructions are installed. |
1534c382 MS |
133 | */ |
134 | static inline int ap_instructions_available(void) | |
135 | { | |
136 | register unsigned long reg0 asm ("0") = AP_MKQID(0,0); | |
137 | register unsigned long reg1 asm ("1") = -ENODEV; | |
138 | register unsigned long reg2 asm ("2") = 0UL; | |
139 | ||
140 | asm volatile( | |
141 | " .long 0xb2af0000\n" /* PQAP(TAPQ) */ | |
142 | "0: la %1,0\n" | |
143 | "1:\n" | |
144 | EX_TABLE(0b, 1b) | |
145 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" ); | |
146 | return reg1; | |
147 | } | |
148 | ||
cb17a636 FB |
149 | /** |
150 | * ap_interrupts_available(): Test if AP interrupts are available. | |
151 | * | |
152 | * Returns 1 if AP interrupts are available. | |
153 | */ | |
154 | static int ap_interrupts_available(void) | |
155 | { | |
156 | unsigned long long facility_bits[2]; | |
157 | ||
158 | if (stfle(facility_bits, 2) <= 1) | |
159 | return 0; | |
160 | if (!(facility_bits[0] & (1ULL << 61)) || | |
161 | !(facility_bits[1] & (1ULL << 62))) | |
162 | return 0; | |
163 | return 1; | |
164 | } | |
165 | ||
1534c382 | 166 | /** |
1749a81d FB |
167 | * ap_test_queue(): Test adjunct processor queue. |
168 | * @qid: The AP queue number | |
169 | * @queue_depth: Pointer to queue depth value | |
170 | * @device_type: Pointer to device type value | |
1534c382 | 171 | * |
1749a81d | 172 | * Returns AP queue status structure. |
1534c382 MS |
173 | */ |
174 | static inline struct ap_queue_status | |
175 | ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
176 | { | |
177 | register unsigned long reg0 asm ("0") = qid; | |
178 | register struct ap_queue_status reg1 asm ("1"); | |
179 | register unsigned long reg2 asm ("2") = 0UL; | |
180 | ||
181 | asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */ | |
182 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
183 | *device_type = (int) (reg2 >> 24); | |
184 | *queue_depth = (int) (reg2 & 0xff); | |
185 | return reg1; | |
186 | } | |
187 | ||
188 | /** | |
1749a81d FB |
189 | * ap_reset_queue(): Reset adjunct processor queue. |
190 | * @qid: The AP queue number | |
1534c382 | 191 | * |
1749a81d | 192 | * Returns AP queue status structure. |
1534c382 MS |
193 | */ |
194 | static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) | |
195 | { | |
196 | register unsigned long reg0 asm ("0") = qid | 0x01000000UL; | |
197 | register struct ap_queue_status reg1 asm ("1"); | |
198 | register unsigned long reg2 asm ("2") = 0UL; | |
199 | ||
200 | asm volatile( | |
201 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
202 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
203 | return reg1; | |
204 | } | |
205 | ||
cb17a636 FB |
206 | #ifdef CONFIG_64BIT |
207 | /** | |
208 | * ap_queue_interruption_control(): Enable interruption for a specific AP. | |
209 | * @qid: The AP queue number | |
210 | * @ind: The notification indicator byte | |
211 | * | |
212 | * Returns AP queue status. | |
213 | */ | |
214 | static inline struct ap_queue_status | |
215 | ap_queue_interruption_control(ap_qid_t qid, void *ind) | |
216 | { | |
217 | register unsigned long reg0 asm ("0") = qid | 0x03000000UL; | |
218 | register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC; | |
219 | register struct ap_queue_status reg1_out asm ("1"); | |
220 | register void *reg2 asm ("2") = ind; | |
221 | asm volatile( | |
222 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
223 | : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) | |
224 | : | |
225 | : "cc" ); | |
226 | return reg1_out; | |
227 | } | |
228 | #endif | |
229 | ||
230 | /** | |
231 | * ap_queue_enable_interruption(): Enable interruption on an AP. | |
232 | * @qid: The AP queue number | |
233 | * @ind: the notification indicator byte | |
234 | * | |
235 | * Enables interruption on AP queue via ap_queue_interruption_control(). Based | |
236 | * on the return value it waits a while and tests the AP queue if interrupts | |
237 | * have been switched on using ap_test_queue(). | |
238 | */ | |
239 | static int ap_queue_enable_interruption(ap_qid_t qid, void *ind) | |
240 | { | |
241 | #ifdef CONFIG_64BIT | |
242 | struct ap_queue_status status; | |
243 | int t_depth, t_device_type, rc, i; | |
244 | ||
245 | rc = -EBUSY; | |
246 | status = ap_queue_interruption_control(qid, ind); | |
247 | ||
248 | for (i = 0; i < AP_MAX_RESET; i++) { | |
249 | switch (status.response_code) { | |
250 | case AP_RESPONSE_NORMAL: | |
251 | if (status.int_enabled) | |
252 | return 0; | |
253 | break; | |
254 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
255 | case AP_RESPONSE_BUSY: | |
256 | break; | |
257 | case AP_RESPONSE_Q_NOT_AVAIL: | |
258 | case AP_RESPONSE_DECONFIGURED: | |
259 | case AP_RESPONSE_CHECKSTOPPED: | |
260 | case AP_RESPONSE_INVALID_ADDRESS: | |
261 | return -ENODEV; | |
262 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
263 | if (status.int_enabled) | |
264 | return 0; | |
265 | break; | |
266 | default: | |
267 | break; | |
268 | } | |
269 | if (i < AP_MAX_RESET - 1) { | |
270 | udelay(5); | |
271 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
272 | } | |
273 | } | |
274 | return rc; | |
275 | #else | |
276 | return -EINVAL; | |
277 | #endif | |
278 | } | |
279 | ||
1534c382 | 280 | /** |
1749a81d FB |
281 | * __ap_send(): Send message to adjunct processor queue. |
282 | * @qid: The AP queue number | |
283 | * @psmid: The program supplied message identifier | |
284 | * @msg: The message text | |
285 | * @length: The message length | |
a6a5d73a | 286 | * @special: Special Bit |
1534c382 | 287 | * |
1749a81d | 288 | * Returns AP queue status structure. |
1534c382 | 289 | * Condition code 1 on NQAP can't happen because the L bit is 1. |
1534c382 MS |
290 | * Condition code 2 on NQAP also means the send is incomplete, |
291 | * because a segment boundary was reached. The NQAP is repeated. | |
292 | */ | |
293 | static inline struct ap_queue_status | |
a6a5d73a FB |
294 | __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length, |
295 | unsigned int special) | |
1534c382 MS |
296 | { |
297 | typedef struct { char _[length]; } msgblock; | |
298 | register unsigned long reg0 asm ("0") = qid | 0x40000000UL; | |
299 | register struct ap_queue_status reg1 asm ("1"); | |
300 | register unsigned long reg2 asm ("2") = (unsigned long) msg; | |
301 | register unsigned long reg3 asm ("3") = (unsigned long) length; | |
302 | register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32); | |
303 | register unsigned long reg5 asm ("5") = (unsigned int) psmid; | |
304 | ||
a6a5d73a FB |
305 | if (special == 1) |
306 | reg0 |= 0x400000UL; | |
307 | ||
1534c382 MS |
308 | asm volatile ( |
309 | "0: .long 0xb2ad0042\n" /* DQAP */ | |
310 | " brc 2,0b" | |
311 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) | |
312 | : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) | |
313 | : "cc" ); | |
314 | return reg1; | |
315 | } | |
316 | ||
317 | int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
318 | { | |
319 | struct ap_queue_status status; | |
320 | ||
a6a5d73a | 321 | status = __ap_send(qid, psmid, msg, length, 0); |
1534c382 MS |
322 | switch (status.response_code) { |
323 | case AP_RESPONSE_NORMAL: | |
324 | return 0; | |
325 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 326 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 | 327 | return -EBUSY; |
a6a5d73a FB |
328 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
329 | return -EINVAL; | |
1534c382 MS |
330 | default: /* Device is gone. */ |
331 | return -ENODEV; | |
332 | } | |
333 | } | |
334 | EXPORT_SYMBOL(ap_send); | |
335 | ||
1749a81d FB |
336 | /** |
337 | * __ap_recv(): Receive message from adjunct processor queue. | |
338 | * @qid: The AP queue number | |
339 | * @psmid: Pointer to program supplied message identifier | |
340 | * @msg: The message text | |
341 | * @length: The message length | |
1534c382 | 342 | * |
1749a81d | 343 | * Returns AP queue status structure. |
1534c382 MS |
344 | * Condition code 1 on DQAP means the receive has taken place |
345 | * but only partially. The response is incomplete, hence the | |
346 | * DQAP is repeated. | |
1534c382 MS |
347 | * Condition code 2 on DQAP also means the receive is incomplete, |
348 | * this time because a segment boundary was reached. Again, the | |
349 | * DQAP is repeated. | |
1534c382 MS |
350 | * Note that gpr2 is used by the DQAP instruction to keep track of |
351 | * any 'residual' length, in case the instruction gets interrupted. | |
352 | * Hence it gets zeroed before the instruction. | |
353 | */ | |
354 | static inline struct ap_queue_status | |
355 | __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
356 | { | |
357 | typedef struct { char _[length]; } msgblock; | |
358 | register unsigned long reg0 asm("0") = qid | 0x80000000UL; | |
359 | register struct ap_queue_status reg1 asm ("1"); | |
360 | register unsigned long reg2 asm("2") = 0UL; | |
361 | register unsigned long reg4 asm("4") = (unsigned long) msg; | |
362 | register unsigned long reg5 asm("5") = (unsigned long) length; | |
363 | register unsigned long reg6 asm("6") = 0UL; | |
364 | register unsigned long reg7 asm("7") = 0UL; | |
365 | ||
366 | ||
367 | asm volatile( | |
368 | "0: .long 0xb2ae0064\n" | |
369 | " brc 6,0b\n" | |
370 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), | |
371 | "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), | |
372 | "=m" (*(msgblock *) msg) : : "cc" ); | |
373 | *psmid = (((unsigned long long) reg6) << 32) + reg7; | |
374 | return reg1; | |
375 | } | |
376 | ||
377 | int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
378 | { | |
379 | struct ap_queue_status status; | |
380 | ||
381 | status = __ap_recv(qid, psmid, msg, length); | |
382 | switch (status.response_code) { | |
383 | case AP_RESPONSE_NORMAL: | |
384 | return 0; | |
385 | case AP_RESPONSE_NO_PENDING_REPLY: | |
386 | if (status.queue_empty) | |
387 | return -ENOENT; | |
388 | return -EBUSY; | |
af512ed0 RW |
389 | case AP_RESPONSE_RESET_IN_PROGRESS: |
390 | return -EBUSY; | |
1534c382 MS |
391 | default: |
392 | return -ENODEV; | |
393 | } | |
394 | } | |
395 | EXPORT_SYMBOL(ap_recv); | |
396 | ||
397 | /** | |
1749a81d FB |
398 | * ap_query_queue(): Check if an AP queue is available. |
399 | * @qid: The AP queue number | |
400 | * @queue_depth: Pointer to queue depth value | |
401 | * @device_type: Pointer to device type value | |
402 | * | |
403 | * The test is repeated for AP_MAX_RESET times. | |
1534c382 MS |
404 | */ |
405 | static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
406 | { | |
407 | struct ap_queue_status status; | |
408 | int t_depth, t_device_type, rc, i; | |
409 | ||
410 | rc = -EBUSY; | |
411 | for (i = 0; i < AP_MAX_RESET; i++) { | |
412 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
413 | switch (status.response_code) { | |
414 | case AP_RESPONSE_NORMAL: | |
415 | *queue_depth = t_depth + 1; | |
416 | *device_type = t_device_type; | |
417 | rc = 0; | |
418 | break; | |
419 | case AP_RESPONSE_Q_NOT_AVAIL: | |
420 | rc = -ENODEV; | |
421 | break; | |
422 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
423 | break; | |
424 | case AP_RESPONSE_DECONFIGURED: | |
425 | rc = -ENODEV; | |
426 | break; | |
427 | case AP_RESPONSE_CHECKSTOPPED: | |
428 | rc = -ENODEV; | |
429 | break; | |
cb17a636 FB |
430 | case AP_RESPONSE_INVALID_ADDRESS: |
431 | rc = -ENODEV; | |
432 | break; | |
433 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
434 | break; | |
1534c382 MS |
435 | case AP_RESPONSE_BUSY: |
436 | break; | |
437 | default: | |
438 | BUG(); | |
439 | } | |
440 | if (rc != -EBUSY) | |
441 | break; | |
442 | if (i < AP_MAX_RESET - 1) | |
443 | udelay(5); | |
444 | } | |
445 | return rc; | |
446 | } | |
447 | ||
448 | /** | |
1749a81d FB |
449 | * ap_init_queue(): Reset an AP queue. |
450 | * @qid: The AP queue number | |
451 | * | |
1534c382 | 452 | * Reset an AP queue and wait for it to become available again. |
1534c382 MS |
453 | */ |
454 | static int ap_init_queue(ap_qid_t qid) | |
455 | { | |
456 | struct ap_queue_status status; | |
457 | int rc, dummy, i; | |
458 | ||
459 | rc = -ENODEV; | |
460 | status = ap_reset_queue(qid); | |
461 | for (i = 0; i < AP_MAX_RESET; i++) { | |
462 | switch (status.response_code) { | |
463 | case AP_RESPONSE_NORMAL: | |
464 | if (status.queue_empty) | |
465 | rc = 0; | |
466 | break; | |
467 | case AP_RESPONSE_Q_NOT_AVAIL: | |
468 | case AP_RESPONSE_DECONFIGURED: | |
469 | case AP_RESPONSE_CHECKSTOPPED: | |
470 | i = AP_MAX_RESET; /* return with -ENODEV */ | |
471 | break; | |
472 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
af512ed0 | 473 | rc = -EBUSY; |
1534c382 MS |
474 | case AP_RESPONSE_BUSY: |
475 | default: | |
476 | break; | |
477 | } | |
af512ed0 | 478 | if (rc != -ENODEV && rc != -EBUSY) |
1534c382 MS |
479 | break; |
480 | if (i < AP_MAX_RESET - 1) { | |
481 | udelay(5); | |
482 | status = ap_test_queue(qid, &dummy, &dummy); | |
483 | } | |
484 | } | |
cb17a636 FB |
485 | if (rc == 0 && ap_using_interrupts()) { |
486 | rc = ap_queue_enable_interruption(qid, ap_interrupt_indicator); | |
487 | /* If interruption mode is supported by the machine, | |
488 | * but an AP can not be enabled for interruption then | |
489 | * the AP will be discarded. */ | |
490 | if (rc) | |
491 | pr_err("Registering adapter interrupts for " | |
492 | "AP %d failed\n", AP_QID_DEVICE(qid)); | |
493 | } | |
1534c382 MS |
494 | return rc; |
495 | } | |
496 | ||
af512ed0 | 497 | /** |
1749a81d FB |
498 | * ap_increase_queue_count(): Arm request timeout. |
499 | * @ap_dev: Pointer to an AP device. | |
500 | * | |
501 | * Arm request timeout if an AP device was idle and a new request is submitted. | |
af512ed0 RW |
502 | */ |
503 | static void ap_increase_queue_count(struct ap_device *ap_dev) | |
504 | { | |
505 | int timeout = ap_dev->drv->request_timeout; | |
506 | ||
507 | ap_dev->queue_count++; | |
508 | if (ap_dev->queue_count == 1) { | |
509 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
510 | ap_dev->reset = AP_RESET_ARMED; | |
511 | } | |
512 | } | |
513 | ||
514 | /** | |
1749a81d FB |
515 | * ap_decrease_queue_count(): Decrease queue count. |
516 | * @ap_dev: Pointer to an AP device. | |
517 | * | |
518 | * If AP device is still alive, re-schedule request timeout if there are still | |
af512ed0 RW |
519 | * pending requests. |
520 | */ | |
521 | static void ap_decrease_queue_count(struct ap_device *ap_dev) | |
522 | { | |
523 | int timeout = ap_dev->drv->request_timeout; | |
524 | ||
525 | ap_dev->queue_count--; | |
526 | if (ap_dev->queue_count > 0) | |
527 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
528 | else | |
1749a81d | 529 | /* |
af512ed0 RW |
530 | * The timeout timer should to be disabled now - since |
531 | * del_timer_sync() is very expensive, we just tell via the | |
532 | * reset flag to ignore the pending timeout timer. | |
533 | */ | |
534 | ap_dev->reset = AP_RESET_IGNORE; | |
535 | } | |
536 | ||
1749a81d | 537 | /* |
1534c382 MS |
538 | * AP device related attributes. |
539 | */ | |
540 | static ssize_t ap_hwtype_show(struct device *dev, | |
541 | struct device_attribute *attr, char *buf) | |
542 | { | |
543 | struct ap_device *ap_dev = to_ap_dev(dev); | |
544 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); | |
545 | } | |
1534c382 | 546 | |
43c207e6 | 547 | static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); |
1534c382 MS |
548 | static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr, |
549 | char *buf) | |
550 | { | |
551 | struct ap_device *ap_dev = to_ap_dev(dev); | |
552 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth); | |
553 | } | |
1534c382 | 554 | |
43c207e6 | 555 | static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); |
1534c382 MS |
556 | static ssize_t ap_request_count_show(struct device *dev, |
557 | struct device_attribute *attr, | |
558 | char *buf) | |
559 | { | |
560 | struct ap_device *ap_dev = to_ap_dev(dev); | |
561 | int rc; | |
562 | ||
563 | spin_lock_bh(&ap_dev->lock); | |
564 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count); | |
565 | spin_unlock_bh(&ap_dev->lock); | |
566 | return rc; | |
567 | } | |
568 | ||
569 | static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); | |
570 | ||
571 | static ssize_t ap_modalias_show(struct device *dev, | |
572 | struct device_attribute *attr, char *buf) | |
573 | { | |
574 | return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type); | |
575 | } | |
576 | ||
577 | static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); | |
578 | ||
579 | static struct attribute *ap_dev_attrs[] = { | |
580 | &dev_attr_hwtype.attr, | |
581 | &dev_attr_depth.attr, | |
582 | &dev_attr_request_count.attr, | |
583 | &dev_attr_modalias.attr, | |
584 | NULL | |
585 | }; | |
586 | static struct attribute_group ap_dev_attr_group = { | |
587 | .attrs = ap_dev_attrs | |
588 | }; | |
589 | ||
590 | /** | |
1749a81d FB |
591 | * ap_bus_match() |
592 | * @dev: Pointer to device | |
593 | * @drv: Pointer to device_driver | |
594 | * | |
1534c382 MS |
595 | * AP bus driver registration/unregistration. |
596 | */ | |
597 | static int ap_bus_match(struct device *dev, struct device_driver *drv) | |
598 | { | |
599 | struct ap_device *ap_dev = to_ap_dev(dev); | |
600 | struct ap_driver *ap_drv = to_ap_drv(drv); | |
601 | struct ap_device_id *id; | |
602 | ||
1749a81d | 603 | /* |
1534c382 MS |
604 | * Compare device type of the device with the list of |
605 | * supported types of the device_driver. | |
606 | */ | |
607 | for (id = ap_drv->ids; id->match_flags; id++) { | |
608 | if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) && | |
609 | (id->dev_type != ap_dev->device_type)) | |
610 | continue; | |
611 | return 1; | |
612 | } | |
613 | return 0; | |
614 | } | |
615 | ||
616 | /** | |
1749a81d FB |
617 | * ap_uevent(): Uevent function for AP devices. |
618 | * @dev: Pointer to device | |
619 | * @env: Pointer to kobj_uevent_env | |
620 | * | |
621 | * It sets up a single environment variable DEV_TYPE which contains the | |
622 | * hardware device type. | |
1534c382 | 623 | */ |
7eff2e7a | 624 | static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) |
1534c382 MS |
625 | { |
626 | struct ap_device *ap_dev = to_ap_dev(dev); | |
7eff2e7a | 627 | int retval = 0; |
1534c382 MS |
628 | |
629 | if (!ap_dev) | |
630 | return -ENODEV; | |
631 | ||
632 | /* Set up DEV_TYPE environment variable. */ | |
7eff2e7a | 633 | retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); |
bf62456e ER |
634 | if (retval) |
635 | return retval; | |
636 | ||
66a4263b | 637 | /* Add MODALIAS= */ |
7eff2e7a | 638 | retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); |
bf62456e | 639 | |
bf62456e | 640 | return retval; |
1534c382 MS |
641 | } |
642 | ||
772f5472 FB |
643 | static int ap_bus_suspend(struct device *dev, pm_message_t state) |
644 | { | |
645 | struct ap_device *ap_dev = to_ap_dev(dev); | |
646 | unsigned long flags; | |
647 | ||
648 | if (!ap_suspend_flag) { | |
649 | ap_suspend_flag = 1; | |
650 | ||
651 | /* Disable scanning for devices, thus we do not want to scan | |
652 | * for them after removing. | |
653 | */ | |
654 | del_timer_sync(&ap_config_timer); | |
655 | if (ap_work_queue != NULL) { | |
656 | destroy_workqueue(ap_work_queue); | |
657 | ap_work_queue = NULL; | |
658 | } | |
5314af69 | 659 | |
772f5472 FB |
660 | tasklet_disable(&ap_tasklet); |
661 | } | |
662 | /* Poll on the device until all requests are finished. */ | |
663 | do { | |
664 | flags = 0; | |
95f1556c | 665 | spin_lock_bh(&ap_dev->lock); |
772f5472 | 666 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 667 | spin_unlock_bh(&ap_dev->lock); |
772f5472 FB |
668 | } while ((flags & 1) || (flags & 2)); |
669 | ||
5314af69 FB |
670 | spin_lock_bh(&ap_dev->lock); |
671 | ap_dev->unregistered = 1; | |
672 | spin_unlock_bh(&ap_dev->lock); | |
673 | ||
772f5472 FB |
674 | return 0; |
675 | } | |
676 | ||
677 | static int ap_bus_resume(struct device *dev) | |
678 | { | |
679 | int rc = 0; | |
680 | struct ap_device *ap_dev = to_ap_dev(dev); | |
681 | ||
682 | if (ap_suspend_flag) { | |
683 | ap_suspend_flag = 0; | |
684 | if (!ap_interrupts_available()) | |
685 | ap_interrupt_indicator = NULL; | |
5314af69 FB |
686 | if (!user_set_domain) { |
687 | ap_domain_index = -1; | |
688 | ap_select_domain(); | |
689 | } | |
772f5472 FB |
690 | init_timer(&ap_config_timer); |
691 | ap_config_timer.function = ap_config_timeout; | |
692 | ap_config_timer.data = 0; | |
693 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
694 | add_timer(&ap_config_timer); | |
695 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
696 | if (!ap_work_queue) | |
697 | return -ENOMEM; | |
698 | tasklet_enable(&ap_tasklet); | |
699 | if (!ap_using_interrupts()) | |
700 | ap_schedule_poll_timer(); | |
701 | else | |
702 | tasklet_schedule(&ap_tasklet); | |
703 | if (ap_thread_flag) | |
704 | rc = ap_poll_thread_start(); | |
772f5472 | 705 | } |
5314af69 FB |
706 | if (AP_QID_QUEUE(ap_dev->qid) != ap_domain_index) { |
707 | spin_lock_bh(&ap_dev->lock); | |
708 | ap_dev->qid = AP_MKQID(AP_QID_DEVICE(ap_dev->qid), | |
709 | ap_domain_index); | |
710 | spin_unlock_bh(&ap_dev->lock); | |
711 | } | |
712 | queue_work(ap_work_queue, &ap_config_work); | |
772f5472 FB |
713 | |
714 | return rc; | |
715 | } | |
716 | ||
1534c382 MS |
717 | static struct bus_type ap_bus_type = { |
718 | .name = "ap", | |
719 | .match = &ap_bus_match, | |
720 | .uevent = &ap_uevent, | |
772f5472 FB |
721 | .suspend = ap_bus_suspend, |
722 | .resume = ap_bus_resume | |
1534c382 MS |
723 | }; |
724 | ||
725 | static int ap_device_probe(struct device *dev) | |
726 | { | |
727 | struct ap_device *ap_dev = to_ap_dev(dev); | |
728 | struct ap_driver *ap_drv = to_ap_drv(dev->driver); | |
729 | int rc; | |
730 | ||
731 | ap_dev->drv = ap_drv; | |
732 | rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; | |
faa582ca | 733 | if (!rc) { |
43c207e6 | 734 | spin_lock_bh(&ap_device_list_lock); |
faa582ca | 735 | list_add(&ap_dev->list, &ap_device_list); |
43c207e6 | 736 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca | 737 | } |
1534c382 MS |
738 | return rc; |
739 | } | |
740 | ||
741 | /** | |
1749a81d FB |
742 | * __ap_flush_queue(): Flush requests. |
743 | * @ap_dev: Pointer to the AP device | |
744 | * | |
1534c382 | 745 | * Flush all requests from the request/pending queue of an AP device. |
1534c382 | 746 | */ |
4d284cac | 747 | static void __ap_flush_queue(struct ap_device *ap_dev) |
1534c382 MS |
748 | { |
749 | struct ap_message *ap_msg, *next; | |
750 | ||
751 | list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) { | |
752 | list_del_init(&ap_msg->list); | |
753 | ap_dev->pendingq_count--; | |
754 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
755 | } | |
756 | list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) { | |
757 | list_del_init(&ap_msg->list); | |
758 | ap_dev->requestq_count--; | |
759 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
760 | } | |
761 | } | |
762 | ||
763 | void ap_flush_queue(struct ap_device *ap_dev) | |
764 | { | |
765 | spin_lock_bh(&ap_dev->lock); | |
766 | __ap_flush_queue(ap_dev); | |
767 | spin_unlock_bh(&ap_dev->lock); | |
768 | } | |
769 | EXPORT_SYMBOL(ap_flush_queue); | |
770 | ||
771 | static int ap_device_remove(struct device *dev) | |
772 | { | |
773 | struct ap_device *ap_dev = to_ap_dev(dev); | |
774 | struct ap_driver *ap_drv = ap_dev->drv; | |
775 | ||
4e56296d | 776 | ap_flush_queue(ap_dev); |
af512ed0 | 777 | del_timer_sync(&ap_dev->timeout); |
43c207e6 | 778 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 779 | list_del_init(&ap_dev->list); |
43c207e6 | 780 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca RW |
781 | if (ap_drv->remove) |
782 | ap_drv->remove(ap_dev); | |
e675c0d2 RW |
783 | spin_lock_bh(&ap_dev->lock); |
784 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
785 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
786 | return 0; |
787 | } | |
788 | ||
789 | int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, | |
790 | char *name) | |
791 | { | |
792 | struct device_driver *drv = &ap_drv->driver; | |
793 | ||
794 | drv->bus = &ap_bus_type; | |
795 | drv->probe = ap_device_probe; | |
796 | drv->remove = ap_device_remove; | |
797 | drv->owner = owner; | |
798 | drv->name = name; | |
799 | return driver_register(drv); | |
800 | } | |
801 | EXPORT_SYMBOL(ap_driver_register); | |
802 | ||
803 | void ap_driver_unregister(struct ap_driver *ap_drv) | |
804 | { | |
805 | driver_unregister(&ap_drv->driver); | |
806 | } | |
807 | EXPORT_SYMBOL(ap_driver_unregister); | |
808 | ||
1749a81d | 809 | /* |
1534c382 MS |
810 | * AP bus attributes. |
811 | */ | |
812 | static ssize_t ap_domain_show(struct bus_type *bus, char *buf) | |
813 | { | |
814 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); | |
815 | } | |
816 | ||
817 | static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL); | |
818 | ||
819 | static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) | |
820 | { | |
821 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); | |
822 | } | |
823 | ||
cb17a636 FB |
824 | static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) |
825 | { | |
826 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
827 | ap_using_interrupts() ? 1 : 0); | |
828 | } | |
829 | ||
830 | static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); | |
831 | ||
1534c382 MS |
832 | static ssize_t ap_config_time_store(struct bus_type *bus, |
833 | const char *buf, size_t count) | |
834 | { | |
835 | int time; | |
836 | ||
837 | if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) | |
838 | return -EINVAL; | |
839 | ap_config_time = time; | |
840 | if (!timer_pending(&ap_config_timer) || | |
841 | !mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) { | |
842 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
843 | add_timer(&ap_config_timer); | |
844 | } | |
845 | return count; | |
846 | } | |
847 | ||
848 | static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); | |
849 | ||
850 | static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) | |
851 | { | |
852 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); | |
853 | } | |
854 | ||
855 | static ssize_t ap_poll_thread_store(struct bus_type *bus, | |
856 | const char *buf, size_t count) | |
857 | { | |
858 | int flag, rc; | |
859 | ||
860 | if (sscanf(buf, "%d\n", &flag) != 1) | |
861 | return -EINVAL; | |
862 | if (flag) { | |
863 | rc = ap_poll_thread_start(); | |
864 | if (rc) | |
865 | return rc; | |
866 | } | |
867 | else | |
868 | ap_poll_thread_stop(); | |
869 | return count; | |
870 | } | |
871 | ||
872 | static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); | |
873 | ||
fe137230 FB |
874 | static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) |
875 | { | |
876 | return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); | |
877 | } | |
878 | ||
879 | static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, | |
880 | size_t count) | |
881 | { | |
882 | unsigned long long time; | |
883 | ktime_t hr_time; | |
884 | ||
885 | /* 120 seconds = maximum poll interval */ | |
cb17a636 FB |
886 | if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || |
887 | time > 120000000000ULL) | |
fe137230 FB |
888 | return -EINVAL; |
889 | poll_timeout = time; | |
890 | hr_time = ktime_set(0, poll_timeout); | |
891 | ||
892 | if (!hrtimer_is_queued(&ap_poll_timer) || | |
6c644eae AV |
893 | !hrtimer_forward(&ap_poll_timer, hrtimer_get_expires(&ap_poll_timer), hr_time)) { |
894 | hrtimer_set_expires(&ap_poll_timer, hr_time); | |
895 | hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); | |
fe137230 FB |
896 | } |
897 | return count; | |
898 | } | |
899 | ||
900 | static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); | |
901 | ||
1534c382 MS |
902 | static struct bus_attribute *const ap_bus_attrs[] = { |
903 | &bus_attr_ap_domain, | |
904 | &bus_attr_config_time, | |
905 | &bus_attr_poll_thread, | |
cb17a636 | 906 | &bus_attr_ap_interrupts, |
fe137230 FB |
907 | &bus_attr_poll_timeout, |
908 | NULL, | |
1534c382 MS |
909 | }; |
910 | ||
911 | /** | |
1749a81d FB |
912 | * ap_select_domain(): Select an AP domain. |
913 | * | |
914 | * Pick one of the 16 AP domains. | |
1534c382 | 915 | */ |
4d284cac | 916 | static int ap_select_domain(void) |
1534c382 MS |
917 | { |
918 | int queue_depth, device_type, count, max_count, best_domain; | |
919 | int rc, i, j; | |
920 | ||
1749a81d | 921 | /* |
1534c382 MS |
922 | * We want to use a single domain. Either the one specified with |
923 | * the "domain=" parameter or the domain with the maximum number | |
924 | * of devices. | |
925 | */ | |
926 | if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS) | |
927 | /* Domain has already been selected. */ | |
928 | return 0; | |
929 | best_domain = -1; | |
930 | max_count = 0; | |
931 | for (i = 0; i < AP_DOMAINS; i++) { | |
932 | count = 0; | |
933 | for (j = 0; j < AP_DEVICES; j++) { | |
934 | ap_qid_t qid = AP_MKQID(j, i); | |
935 | rc = ap_query_queue(qid, &queue_depth, &device_type); | |
936 | if (rc) | |
937 | continue; | |
938 | count++; | |
939 | } | |
940 | if (count > max_count) { | |
941 | max_count = count; | |
942 | best_domain = i; | |
943 | } | |
944 | } | |
945 | if (best_domain >= 0){ | |
946 | ap_domain_index = best_domain; | |
947 | return 0; | |
948 | } | |
949 | return -ENODEV; | |
950 | } | |
951 | ||
952 | /** | |
1749a81d | 953 | * ap_probe_device_type(): Find the device type of an AP. |
1534c382 | 954 | * @ap_dev: pointer to the AP device. |
1749a81d FB |
955 | * |
956 | * Find the device type if query queue returned a device type of 0. | |
1534c382 MS |
957 | */ |
958 | static int ap_probe_device_type(struct ap_device *ap_dev) | |
959 | { | |
960 | static unsigned char msg[] = { | |
961 | 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00, | |
962 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
963 | 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00, | |
964 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
965 | 0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50, | |
966 | 0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01, | |
967 | 0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00, | |
968 | 0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00, | |
969 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
970 | 0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00, | |
971 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
972 | 0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00, | |
973 | 0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00, | |
974 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
975 | 0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00, | |
976 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
977 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
978 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
979 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
980 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
981 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
982 | 0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00, | |
983 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
984 | 0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00, | |
985 | 0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20, | |
986 | 0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53, | |
987 | 0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22, | |
988 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
989 | 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88, | |
990 | 0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66, | |
991 | 0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44, | |
992 | 0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22, | |
993 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
994 | 0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77, | |
995 | 0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00, | |
996 | 0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00, | |
997 | 0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01, | |
998 | 0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c, | |
999 | 0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68, | |
1000 | 0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66, | |
1001 | 0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0, | |
1002 | 0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8, | |
1003 | 0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04, | |
1004 | 0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57, | |
1005 | 0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d, | |
1006 | }; | |
1007 | struct ap_queue_status status; | |
1008 | unsigned long long psmid; | |
1009 | char *reply; | |
1010 | int rc, i; | |
1011 | ||
1012 | reply = (void *) get_zeroed_page(GFP_KERNEL); | |
1013 | if (!reply) { | |
1014 | rc = -ENOMEM; | |
1015 | goto out; | |
1016 | } | |
1017 | ||
1018 | status = __ap_send(ap_dev->qid, 0x0102030405060708ULL, | |
a6a5d73a | 1019 | msg, sizeof(msg), 0); |
1534c382 MS |
1020 | if (status.response_code != AP_RESPONSE_NORMAL) { |
1021 | rc = -ENODEV; | |
1022 | goto out_free; | |
1023 | } | |
1024 | ||
1025 | /* Wait for the test message to complete. */ | |
1026 | for (i = 0; i < 6; i++) { | |
1027 | mdelay(300); | |
1028 | status = __ap_recv(ap_dev->qid, &psmid, reply, 4096); | |
1029 | if (status.response_code == AP_RESPONSE_NORMAL && | |
1030 | psmid == 0x0102030405060708ULL) | |
1031 | break; | |
1032 | } | |
1033 | if (i < 6) { | |
1034 | /* Got an answer. */ | |
1035 | if (reply[0] == 0x00 && reply[1] == 0x86) | |
1036 | ap_dev->device_type = AP_DEVICE_TYPE_PCICC; | |
1037 | else | |
1038 | ap_dev->device_type = AP_DEVICE_TYPE_PCICA; | |
1039 | rc = 0; | |
1040 | } else | |
1041 | rc = -ENODEV; | |
1042 | ||
1043 | out_free: | |
1044 | free_page((unsigned long) reply); | |
1045 | out: | |
1046 | return rc; | |
1047 | } | |
1048 | ||
cb17a636 FB |
1049 | static void ap_interrupt_handler(void *unused1, void *unused2) |
1050 | { | |
1051 | tasklet_schedule(&ap_tasklet); | |
1052 | } | |
1053 | ||
1534c382 | 1054 | /** |
1749a81d FB |
1055 | * __ap_scan_bus(): Scan the AP bus. |
1056 | * @dev: Pointer to device | |
1057 | * @data: Pointer to data | |
1058 | * | |
1059 | * Scan the AP bus for new devices. | |
1534c382 MS |
1060 | */ |
1061 | static int __ap_scan_bus(struct device *dev, void *data) | |
1062 | { | |
1063 | return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data; | |
1064 | } | |
1065 | ||
1066 | static void ap_device_release(struct device *dev) | |
1067 | { | |
1068 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1069 | ||
1070 | kfree(ap_dev); | |
1071 | } | |
1072 | ||
4927b3f7 | 1073 | static void ap_scan_bus(struct work_struct *unused) |
1534c382 MS |
1074 | { |
1075 | struct ap_device *ap_dev; | |
1076 | struct device *dev; | |
1077 | ap_qid_t qid; | |
1078 | int queue_depth, device_type; | |
1079 | int rc, i; | |
1080 | ||
1081 | if (ap_select_domain() != 0) | |
1082 | return; | |
1083 | for (i = 0; i < AP_DEVICES; i++) { | |
1084 | qid = AP_MKQID(i, ap_domain_index); | |
1085 | dev = bus_find_device(&ap_bus_type, NULL, | |
1086 | (void *)(unsigned long)qid, | |
1087 | __ap_scan_bus); | |
f3b017d8 | 1088 | rc = ap_query_queue(qid, &queue_depth, &device_type); |
c6a48264 | 1089 | if (dev) { |
af512ed0 RW |
1090 | if (rc == -EBUSY) { |
1091 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1092 | schedule_timeout(AP_RESET_TIMEOUT); | |
1093 | rc = ap_query_queue(qid, &queue_depth, | |
1094 | &device_type); | |
1095 | } | |
c6a48264 RW |
1096 | ap_dev = to_ap_dev(dev); |
1097 | spin_lock_bh(&ap_dev->lock); | |
1098 | if (rc || ap_dev->unregistered) { | |
1099 | spin_unlock_bh(&ap_dev->lock); | |
5314af69 FB |
1100 | if (ap_dev->unregistered) |
1101 | i--; | |
c6a48264 | 1102 | device_unregister(dev); |
af512ed0 | 1103 | put_device(dev); |
c6a48264 | 1104 | continue; |
af512ed0 RW |
1105 | } |
1106 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
1107 | put_device(dev); |
1108 | continue; | |
1109 | } | |
1534c382 MS |
1110 | if (rc) |
1111 | continue; | |
1112 | rc = ap_init_queue(qid); | |
1113 | if (rc) | |
1114 | continue; | |
1115 | ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL); | |
1116 | if (!ap_dev) | |
1117 | break; | |
1118 | ap_dev->qid = qid; | |
1119 | ap_dev->queue_depth = queue_depth; | |
4e56296d | 1120 | ap_dev->unregistered = 1; |
1534c382 MS |
1121 | spin_lock_init(&ap_dev->lock); |
1122 | INIT_LIST_HEAD(&ap_dev->pendingq); | |
1123 | INIT_LIST_HEAD(&ap_dev->requestq); | |
cf352ce0 | 1124 | INIT_LIST_HEAD(&ap_dev->list); |
af512ed0 RW |
1125 | setup_timer(&ap_dev->timeout, ap_request_timeout, |
1126 | (unsigned long) ap_dev); | |
1534c382 MS |
1127 | if (device_type == 0) |
1128 | ap_probe_device_type(ap_dev); | |
1129 | else | |
1130 | ap_dev->device_type = device_type; | |
1131 | ||
1132 | ap_dev->device.bus = &ap_bus_type; | |
1133 | ap_dev->device.parent = ap_root_device; | |
edc44fa0 FB |
1134 | if (dev_set_name(&ap_dev->device, "card%02x", |
1135 | AP_QID_DEVICE(ap_dev->qid))) { | |
1136 | kfree(ap_dev); | |
1137 | continue; | |
1138 | } | |
1534c382 MS |
1139 | ap_dev->device.release = ap_device_release; |
1140 | rc = device_register(&ap_dev->device); | |
1141 | if (rc) { | |
c6304933 | 1142 | put_device(&ap_dev->device); |
1534c382 MS |
1143 | continue; |
1144 | } | |
1145 | /* Add device attributes. */ | |
1146 | rc = sysfs_create_group(&ap_dev->device.kobj, | |
1147 | &ap_dev_attr_group); | |
4e56296d RW |
1148 | if (!rc) { |
1149 | spin_lock_bh(&ap_dev->lock); | |
1150 | ap_dev->unregistered = 0; | |
1151 | spin_unlock_bh(&ap_dev->lock); | |
1152 | } | |
1153 | else | |
1534c382 MS |
1154 | device_unregister(&ap_dev->device); |
1155 | } | |
1156 | } | |
1157 | ||
1158 | static void | |
1159 | ap_config_timeout(unsigned long ptr) | |
1160 | { | |
1161 | queue_work(ap_work_queue, &ap_config_work); | |
1162 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1163 | add_timer(&ap_config_timer); | |
1164 | } | |
1165 | ||
1166 | /** | |
1749a81d FB |
1167 | * ap_schedule_poll_timer(): Schedule poll timer. |
1168 | * | |
1534c382 MS |
1169 | * Set up the timer to run the poll tasklet |
1170 | */ | |
1171 | static inline void ap_schedule_poll_timer(void) | |
1172 | { | |
8d406c6d | 1173 | ktime_t hr_time; |
93521314 FB |
1174 | |
1175 | spin_lock_bh(&ap_poll_timer_lock); | |
772f5472 | 1176 | if (ap_using_interrupts() || ap_suspend_flag) |
93521314 | 1177 | goto out; |
fe137230 | 1178 | if (hrtimer_is_queued(&ap_poll_timer)) |
93521314 | 1179 | goto out; |
8d406c6d FB |
1180 | if (ktime_to_ns(hrtimer_expires_remaining(&ap_poll_timer)) <= 0) { |
1181 | hr_time = ktime_set(0, poll_timeout); | |
1182 | hrtimer_forward_now(&ap_poll_timer, hr_time); | |
1183 | hrtimer_restart(&ap_poll_timer); | |
1184 | } | |
93521314 FB |
1185 | out: |
1186 | spin_unlock_bh(&ap_poll_timer_lock); | |
1534c382 MS |
1187 | } |
1188 | ||
1189 | /** | |
1749a81d | 1190 | * ap_poll_read(): Receive pending reply messages from an AP device. |
1534c382 MS |
1191 | * @ap_dev: pointer to the AP device |
1192 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1193 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1194 | * |
1534c382 MS |
1195 | * Returns 0 if the device is still present, -ENODEV if not. |
1196 | */ | |
4d284cac | 1197 | static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1198 | { |
1199 | struct ap_queue_status status; | |
1200 | struct ap_message *ap_msg; | |
1201 | ||
1202 | if (ap_dev->queue_count <= 0) | |
1203 | return 0; | |
1204 | status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid, | |
1205 | ap_dev->reply->message, ap_dev->reply->length); | |
1206 | switch (status.response_code) { | |
1207 | case AP_RESPONSE_NORMAL: | |
1208 | atomic_dec(&ap_poll_requests); | |
af512ed0 | 1209 | ap_decrease_queue_count(ap_dev); |
1534c382 MS |
1210 | list_for_each_entry(ap_msg, &ap_dev->pendingq, list) { |
1211 | if (ap_msg->psmid != ap_dev->reply->psmid) | |
1212 | continue; | |
1213 | list_del_init(&ap_msg->list); | |
1214 | ap_dev->pendingq_count--; | |
1215 | ap_dev->drv->receive(ap_dev, ap_msg, ap_dev->reply); | |
1216 | break; | |
1217 | } | |
1218 | if (ap_dev->queue_count > 0) | |
1219 | *flags |= 1; | |
1220 | break; | |
1221 | case AP_RESPONSE_NO_PENDING_REPLY: | |
1222 | if (status.queue_empty) { | |
1223 | /* The card shouldn't forget requests but who knows. */ | |
e675c0d2 | 1224 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); |
1534c382 MS |
1225 | ap_dev->queue_count = 0; |
1226 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1227 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1228 | ap_dev->pendingq_count = 0; | |
1229 | } else | |
1230 | *flags |= 2; | |
1231 | break; | |
1232 | default: | |
1233 | return -ENODEV; | |
1234 | } | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | /** | |
1749a81d | 1239 | * ap_poll_write(): Send messages from the request queue to an AP device. |
1534c382 MS |
1240 | * @ap_dev: pointer to the AP device |
1241 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1242 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1243 | * |
1534c382 MS |
1244 | * Returns 0 if the device is still present, -ENODEV if not. |
1245 | */ | |
4d284cac | 1246 | static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1247 | { |
1248 | struct ap_queue_status status; | |
1249 | struct ap_message *ap_msg; | |
1250 | ||
1251 | if (ap_dev->requestq_count <= 0 || | |
1252 | ap_dev->queue_count >= ap_dev->queue_depth) | |
1253 | return 0; | |
1254 | /* Start the next request on the queue. */ | |
1255 | ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list); | |
1256 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
a6a5d73a | 1257 | ap_msg->message, ap_msg->length, ap_msg->special); |
1534c382 MS |
1258 | switch (status.response_code) { |
1259 | case AP_RESPONSE_NORMAL: | |
1260 | atomic_inc(&ap_poll_requests); | |
af512ed0 | 1261 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1262 | list_move_tail(&ap_msg->list, &ap_dev->pendingq); |
1263 | ap_dev->requestq_count--; | |
1264 | ap_dev->pendingq_count++; | |
1265 | if (ap_dev->queue_count < ap_dev->queue_depth && | |
1266 | ap_dev->requestq_count > 0) | |
1267 | *flags |= 1; | |
1268 | *flags |= 2; | |
1269 | break; | |
1270 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1271 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1272 | *flags |= 2; |
1273 | break; | |
1274 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
a6a5d73a | 1275 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
1534c382 MS |
1276 | return -EINVAL; |
1277 | default: | |
1278 | return -ENODEV; | |
1279 | } | |
1280 | return 0; | |
1281 | } | |
1282 | ||
1283 | /** | |
1749a81d | 1284 | * ap_poll_queue(): Poll AP device for pending replies and send new messages. |
1534c382 MS |
1285 | * @ap_dev: pointer to the bus device |
1286 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1287 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d FB |
1288 | * |
1289 | * Poll AP device for pending replies and send new messages. If either | |
1290 | * ap_poll_read or ap_poll_write returns -ENODEV unregister the device. | |
1534c382 MS |
1291 | * Returns 0. |
1292 | */ | |
1293 | static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags) | |
1294 | { | |
1295 | int rc; | |
1296 | ||
1297 | rc = ap_poll_read(ap_dev, flags); | |
1298 | if (rc) | |
1299 | return rc; | |
1300 | return ap_poll_write(ap_dev, flags); | |
1301 | } | |
1302 | ||
1303 | /** | |
1749a81d | 1304 | * __ap_queue_message(): Queue a message to a device. |
1534c382 MS |
1305 | * @ap_dev: pointer to the AP device |
1306 | * @ap_msg: the message to be queued | |
1749a81d FB |
1307 | * |
1308 | * Queue a message to a device. Returns 0 if successful. | |
1534c382 MS |
1309 | */ |
1310 | static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1311 | { | |
1312 | struct ap_queue_status status; | |
1313 | ||
1314 | if (list_empty(&ap_dev->requestq) && | |
1315 | ap_dev->queue_count < ap_dev->queue_depth) { | |
1316 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
a6a5d73a FB |
1317 | ap_msg->message, ap_msg->length, |
1318 | ap_msg->special); | |
1534c382 MS |
1319 | switch (status.response_code) { |
1320 | case AP_RESPONSE_NORMAL: | |
1321 | list_add_tail(&ap_msg->list, &ap_dev->pendingq); | |
1322 | atomic_inc(&ap_poll_requests); | |
1323 | ap_dev->pendingq_count++; | |
af512ed0 | 1324 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1325 | ap_dev->total_request_count++; |
1326 | break; | |
1327 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1328 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1329 | list_add_tail(&ap_msg->list, &ap_dev->requestq); |
1330 | ap_dev->requestq_count++; | |
1331 | ap_dev->total_request_count++; | |
1332 | return -EBUSY; | |
a6a5d73a | 1333 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
1534c382 MS |
1334 | case AP_RESPONSE_MESSAGE_TOO_BIG: |
1335 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL)); | |
1336 | return -EINVAL; | |
1337 | default: /* Device is gone. */ | |
1338 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
1339 | return -ENODEV; | |
1340 | } | |
1341 | } else { | |
1342 | list_add_tail(&ap_msg->list, &ap_dev->requestq); | |
1343 | ap_dev->requestq_count++; | |
1344 | ap_dev->total_request_count++; | |
1345 | return -EBUSY; | |
1346 | } | |
1347 | ap_schedule_poll_timer(); | |
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1352 | { | |
1353 | unsigned long flags; | |
1354 | int rc; | |
1355 | ||
1356 | spin_lock_bh(&ap_dev->lock); | |
1357 | if (!ap_dev->unregistered) { | |
1358 | /* Make room on the queue by polling for finished requests. */ | |
1359 | rc = ap_poll_queue(ap_dev, &flags); | |
1360 | if (!rc) | |
1361 | rc = __ap_queue_message(ap_dev, ap_msg); | |
1362 | if (!rc) | |
1363 | wake_up(&ap_poll_wait); | |
4e56296d RW |
1364 | if (rc == -ENODEV) |
1365 | ap_dev->unregistered = 1; | |
1534c382 MS |
1366 | } else { |
1367 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
c6a48264 | 1368 | rc = -ENODEV; |
1534c382 MS |
1369 | } |
1370 | spin_unlock_bh(&ap_dev->lock); | |
1371 | if (rc == -ENODEV) | |
1372 | device_unregister(&ap_dev->device); | |
1373 | } | |
1374 | EXPORT_SYMBOL(ap_queue_message); | |
1375 | ||
1376 | /** | |
1749a81d FB |
1377 | * ap_cancel_message(): Cancel a crypto request. |
1378 | * @ap_dev: The AP device that has the message queued | |
1379 | * @ap_msg: The message that is to be removed | |
1380 | * | |
1534c382 | 1381 | * Cancel a crypto request. This is done by removing the request |
1749a81d | 1382 | * from the device pending or request queue. Note that the |
1534c382 MS |
1383 | * request stays on the AP queue. When it finishes the message |
1384 | * reply will be discarded because the psmid can't be found. | |
1534c382 MS |
1385 | */ |
1386 | void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1387 | { | |
1388 | struct ap_message *tmp; | |
1389 | ||
1390 | spin_lock_bh(&ap_dev->lock); | |
1391 | if (!list_empty(&ap_msg->list)) { | |
1392 | list_for_each_entry(tmp, &ap_dev->pendingq, list) | |
1393 | if (tmp->psmid == ap_msg->psmid) { | |
1394 | ap_dev->pendingq_count--; | |
1395 | goto found; | |
1396 | } | |
1397 | ap_dev->requestq_count--; | |
1398 | found: | |
1399 | list_del_init(&ap_msg->list); | |
1400 | } | |
1401 | spin_unlock_bh(&ap_dev->lock); | |
1402 | } | |
1403 | EXPORT_SYMBOL(ap_cancel_message); | |
1404 | ||
1405 | /** | |
1749a81d | 1406 | * ap_poll_timeout(): AP receive polling for finished AP requests. |
fe137230 | 1407 | * @unused: Unused pointer. |
1749a81d | 1408 | * |
fe137230 | 1409 | * Schedules the AP tasklet using a high resolution timer. |
1534c382 | 1410 | */ |
fe137230 | 1411 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) |
1534c382 MS |
1412 | { |
1413 | tasklet_schedule(&ap_tasklet); | |
fe137230 | 1414 | return HRTIMER_NORESTART; |
1534c382 MS |
1415 | } |
1416 | ||
af512ed0 | 1417 | /** |
1749a81d FB |
1418 | * ap_reset(): Reset a not responding AP device. |
1419 | * @ap_dev: Pointer to the AP device | |
1420 | * | |
af512ed0 RW |
1421 | * Reset a not responding AP device and move all requests from the |
1422 | * pending queue to the request queue. | |
1423 | */ | |
1424 | static void ap_reset(struct ap_device *ap_dev) | |
1425 | { | |
1426 | int rc; | |
1427 | ||
1428 | ap_dev->reset = AP_RESET_IGNORE; | |
1429 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
1430 | ap_dev->queue_count = 0; | |
1431 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1432 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1433 | ap_dev->pendingq_count = 0; | |
1434 | rc = ap_init_queue(ap_dev->qid); | |
1435 | if (rc == -ENODEV) | |
1436 | ap_dev->unregistered = 1; | |
1437 | } | |
1438 | ||
43c207e6 | 1439 | static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 | 1440 | { |
1534c382 | 1441 | if (!ap_dev->unregistered) { |
c6a48264 | 1442 | if (ap_poll_queue(ap_dev, flags)) |
4e56296d | 1443 | ap_dev->unregistered = 1; |
af512ed0 RW |
1444 | if (ap_dev->reset == AP_RESET_DO) |
1445 | ap_reset(ap_dev); | |
c6a48264 | 1446 | } |
1534c382 MS |
1447 | return 0; |
1448 | } | |
1449 | ||
1749a81d FB |
1450 | /** |
1451 | * ap_poll_all(): Poll all AP devices. | |
1452 | * @dummy: Unused variable | |
1453 | * | |
1454 | * Poll all AP devices on the bus in a round robin fashion. Continue | |
1455 | * polling until bit 2^0 of the control flags is not set. If bit 2^1 | |
1456 | * of the control flags has been set arm the poll timer. | |
1457 | */ | |
1534c382 MS |
1458 | static void ap_poll_all(unsigned long dummy) |
1459 | { | |
1460 | unsigned long flags; | |
cf352ce0 | 1461 | struct ap_device *ap_dev; |
1534c382 | 1462 | |
cb17a636 FB |
1463 | /* Reset the indicator if interrupts are used. Thus new interrupts can |
1464 | * be received. Doing it in the beginning of the tasklet is therefor | |
1465 | * important that no requests on any AP get lost. | |
1466 | */ | |
1467 | if (ap_using_interrupts()) | |
1468 | xchg((u8 *)ap_interrupt_indicator, 0); | |
1534c382 MS |
1469 | do { |
1470 | flags = 0; | |
43c207e6 | 1471 | spin_lock(&ap_device_list_lock); |
cf352ce0 | 1472 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
95f1556c | 1473 | spin_lock(&ap_dev->lock); |
43c207e6 | 1474 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 1475 | spin_unlock(&ap_dev->lock); |
cf352ce0 | 1476 | } |
43c207e6 | 1477 | spin_unlock(&ap_device_list_lock); |
1534c382 MS |
1478 | } while (flags & 1); |
1479 | if (flags & 2) | |
1480 | ap_schedule_poll_timer(); | |
1481 | } | |
1482 | ||
1483 | /** | |
1749a81d FB |
1484 | * ap_poll_thread(): Thread that polls for finished requests. |
1485 | * @data: Unused pointer | |
1486 | * | |
1534c382 MS |
1487 | * AP bus poll thread. The purpose of this thread is to poll for |
1488 | * finished requests in a loop if there is a "free" cpu - that is | |
1489 | * a cpu that doesn't have anything better to do. The polling stops | |
1490 | * as soon as there is another task or if all messages have been | |
1491 | * delivered. | |
1492 | */ | |
1493 | static int ap_poll_thread(void *data) | |
1494 | { | |
1495 | DECLARE_WAITQUEUE(wait, current); | |
1496 | unsigned long flags; | |
1497 | int requests; | |
cf352ce0 | 1498 | struct ap_device *ap_dev; |
1534c382 | 1499 | |
d83682b3 | 1500 | set_user_nice(current, 19); |
1534c382 | 1501 | while (1) { |
772f5472 FB |
1502 | if (ap_suspend_flag) |
1503 | return 0; | |
1534c382 MS |
1504 | if (need_resched()) { |
1505 | schedule(); | |
1506 | continue; | |
1507 | } | |
1508 | add_wait_queue(&ap_poll_wait, &wait); | |
1509 | set_current_state(TASK_INTERRUPTIBLE); | |
1510 | if (kthread_should_stop()) | |
1511 | break; | |
1512 | requests = atomic_read(&ap_poll_requests); | |
1513 | if (requests <= 0) | |
1514 | schedule(); | |
1515 | set_current_state(TASK_RUNNING); | |
1516 | remove_wait_queue(&ap_poll_wait, &wait); | |
1517 | ||
1534c382 | 1518 | flags = 0; |
43c207e6 | 1519 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 1520 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
95f1556c | 1521 | spin_lock(&ap_dev->lock); |
43c207e6 | 1522 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 1523 | spin_unlock(&ap_dev->lock); |
cf352ce0 | 1524 | } |
43c207e6 | 1525 | spin_unlock_bh(&ap_device_list_lock); |
1534c382 MS |
1526 | } |
1527 | set_current_state(TASK_RUNNING); | |
1528 | remove_wait_queue(&ap_poll_wait, &wait); | |
1529 | return 0; | |
1530 | } | |
1531 | ||
1532 | static int ap_poll_thread_start(void) | |
1533 | { | |
1534 | int rc; | |
1535 | ||
772f5472 | 1536 | if (ap_using_interrupts() || ap_suspend_flag) |
cb17a636 | 1537 | return 0; |
1534c382 MS |
1538 | mutex_lock(&ap_poll_thread_mutex); |
1539 | if (!ap_poll_kthread) { | |
1540 | ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); | |
1541 | rc = IS_ERR(ap_poll_kthread) ? PTR_ERR(ap_poll_kthread) : 0; | |
1542 | if (rc) | |
1543 | ap_poll_kthread = NULL; | |
1544 | } | |
1545 | else | |
1546 | rc = 0; | |
1547 | mutex_unlock(&ap_poll_thread_mutex); | |
1548 | return rc; | |
1549 | } | |
1550 | ||
1551 | static void ap_poll_thread_stop(void) | |
1552 | { | |
1553 | mutex_lock(&ap_poll_thread_mutex); | |
1554 | if (ap_poll_kthread) { | |
1555 | kthread_stop(ap_poll_kthread); | |
1556 | ap_poll_kthread = NULL; | |
1557 | } | |
1558 | mutex_unlock(&ap_poll_thread_mutex); | |
1559 | } | |
1560 | ||
af512ed0 | 1561 | /** |
1749a81d FB |
1562 | * ap_request_timeout(): Handling of request timeouts |
1563 | * @data: Holds the AP device. | |
1564 | * | |
1565 | * Handles request timeouts. | |
af512ed0 RW |
1566 | */ |
1567 | static void ap_request_timeout(unsigned long data) | |
1568 | { | |
1569 | struct ap_device *ap_dev = (struct ap_device *) data; | |
1570 | ||
cb17a636 | 1571 | if (ap_dev->reset == AP_RESET_ARMED) { |
af512ed0 | 1572 | ap_dev->reset = AP_RESET_DO; |
cb17a636 FB |
1573 | |
1574 | if (ap_using_interrupts()) | |
1575 | tasklet_schedule(&ap_tasklet); | |
1576 | } | |
af512ed0 RW |
1577 | } |
1578 | ||
13e742ba RW |
1579 | static void ap_reset_domain(void) |
1580 | { | |
1581 | int i; | |
1582 | ||
39aa7cf6 RW |
1583 | if (ap_domain_index != -1) |
1584 | for (i = 0; i < AP_DEVICES; i++) | |
1585 | ap_reset_queue(AP_MKQID(i, ap_domain_index)); | |
13e742ba RW |
1586 | } |
1587 | ||
1588 | static void ap_reset_all(void) | |
85eca850 RW |
1589 | { |
1590 | int i, j; | |
1591 | ||
1592 | for (i = 0; i < AP_DOMAINS; i++) | |
1593 | for (j = 0; j < AP_DEVICES; j++) | |
1594 | ap_reset_queue(AP_MKQID(j, i)); | |
1595 | } | |
1596 | ||
1597 | static struct reset_call ap_reset_call = { | |
13e742ba | 1598 | .fn = ap_reset_all, |
85eca850 RW |
1599 | }; |
1600 | ||
1534c382 | 1601 | /** |
1749a81d FB |
1602 | * ap_module_init(): The module initialization code. |
1603 | * | |
1604 | * Initializes the module. | |
1534c382 MS |
1605 | */ |
1606 | int __init ap_module_init(void) | |
1607 | { | |
1608 | int rc, i; | |
1609 | ||
1610 | if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) { | |
136f7a1c MS |
1611 | pr_warning("%d is not a valid cryptographic domain\n", |
1612 | ap_domain_index); | |
1534c382 MS |
1613 | return -EINVAL; |
1614 | } | |
5314af69 FB |
1615 | /* In resume callback we need to know if the user had set the domain. |
1616 | * If so, we can not just reset it. | |
1617 | */ | |
1618 | if (ap_domain_index >= 0) | |
1619 | user_set_domain = 1; | |
1620 | ||
1534c382 | 1621 | if (ap_instructions_available() != 0) { |
136f7a1c MS |
1622 | pr_warning("The hardware system does not support " |
1623 | "AP instructions\n"); | |
1534c382 MS |
1624 | return -ENODEV; |
1625 | } | |
cb17a636 FB |
1626 | if (ap_interrupts_available()) { |
1627 | isc_register(AP_ISC); | |
1628 | ap_interrupt_indicator = s390_register_adapter_interrupt( | |
1629 | &ap_interrupt_handler, NULL, AP_ISC); | |
1630 | if (IS_ERR(ap_interrupt_indicator)) { | |
1631 | ap_interrupt_indicator = NULL; | |
1632 | isc_unregister(AP_ISC); | |
1633 | } | |
1634 | } | |
1635 | ||
85eca850 | 1636 | register_reset_call(&ap_reset_call); |
1534c382 MS |
1637 | |
1638 | /* Create /sys/bus/ap. */ | |
1639 | rc = bus_register(&ap_bus_type); | |
1640 | if (rc) | |
1641 | goto out; | |
1642 | for (i = 0; ap_bus_attrs[i]; i++) { | |
1643 | rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); | |
1644 | if (rc) | |
1645 | goto out_bus; | |
1646 | } | |
1647 | ||
1648 | /* Create /sys/devices/ap. */ | |
035da16f | 1649 | ap_root_device = root_device_register("ap"); |
1534c382 MS |
1650 | rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0; |
1651 | if (rc) | |
1652 | goto out_bus; | |
1653 | ||
1654 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
1655 | if (!ap_work_queue) { | |
1656 | rc = -ENOMEM; | |
1657 | goto out_root; | |
1658 | } | |
1659 | ||
1660 | if (ap_select_domain() == 0) | |
1661 | ap_scan_bus(NULL); | |
1662 | ||
1749a81d | 1663 | /* Setup the AP bus rescan timer. */ |
1534c382 MS |
1664 | init_timer(&ap_config_timer); |
1665 | ap_config_timer.function = ap_config_timeout; | |
1666 | ap_config_timer.data = 0; | |
1667 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1668 | add_timer(&ap_config_timer); | |
1669 | ||
fe137230 FB |
1670 | /* Setup the high resultion poll timer. |
1671 | * If we are running under z/VM adjust polling to z/VM polling rate. | |
1672 | */ | |
1673 | if (MACHINE_IS_VM) | |
1674 | poll_timeout = 1500000; | |
93521314 | 1675 | spin_lock_init(&ap_poll_timer_lock); |
fe137230 FB |
1676 | hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
1677 | ap_poll_timer.function = ap_poll_timeout; | |
1678 | ||
1534c382 MS |
1679 | /* Start the low priority AP bus poll thread. */ |
1680 | if (ap_thread_flag) { | |
1681 | rc = ap_poll_thread_start(); | |
1682 | if (rc) | |
1683 | goto out_work; | |
1684 | } | |
1685 | ||
1686 | return 0; | |
1687 | ||
1688 | out_work: | |
1689 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1690 | hrtimer_cancel(&ap_poll_timer); |
1534c382 MS |
1691 | destroy_workqueue(ap_work_queue); |
1692 | out_root: | |
035da16f | 1693 | root_device_unregister(ap_root_device); |
1534c382 MS |
1694 | out_bus: |
1695 | while (i--) | |
1696 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1697 | bus_unregister(&ap_bus_type); | |
1698 | out: | |
85eca850 | 1699 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1700 | if (ap_using_interrupts()) { |
1701 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1702 | isc_unregister(AP_ISC); | |
1703 | } | |
1534c382 MS |
1704 | return rc; |
1705 | } | |
1706 | ||
1707 | static int __ap_match_all(struct device *dev, void *data) | |
1708 | { | |
1709 | return 1; | |
1710 | } | |
1711 | ||
1712 | /** | |
1749a81d FB |
1713 | * ap_modules_exit(): The module termination code |
1714 | * | |
1715 | * Terminates the module. | |
1534c382 MS |
1716 | */ |
1717 | void ap_module_exit(void) | |
1718 | { | |
1719 | int i; | |
1720 | struct device *dev; | |
1721 | ||
13e742ba | 1722 | ap_reset_domain(); |
1534c382 MS |
1723 | ap_poll_thread_stop(); |
1724 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1725 | hrtimer_cancel(&ap_poll_timer); |
1534c382 | 1726 | destroy_workqueue(ap_work_queue); |
13e742ba | 1727 | tasklet_kill(&ap_tasklet); |
035da16f | 1728 | root_device_unregister(ap_root_device); |
1534c382 MS |
1729 | while ((dev = bus_find_device(&ap_bus_type, NULL, NULL, |
1730 | __ap_match_all))) | |
1731 | { | |
1732 | device_unregister(dev); | |
1733 | put_device(dev); | |
1734 | } | |
1735 | for (i = 0; ap_bus_attrs[i]; i++) | |
1736 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1737 | bus_unregister(&ap_bus_type); | |
85eca850 | 1738 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1739 | if (ap_using_interrupts()) { |
1740 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1741 | isc_unregister(AP_ISC); | |
1742 | } | |
1534c382 MS |
1743 | } |
1744 | ||
1745 | #ifndef CONFIG_ZCRYPT_MONOLITHIC | |
1746 | module_init(ap_module_init); | |
1747 | module_exit(ap_module_exit); | |
1748 | #endif |