Commit | Line | Data |
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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> |
6bed05bc | 9 | * Holger Dengler <hd@linux.vnet.ibm.com> |
1534c382 MS |
10 | * |
11 | * Adjunct processor bus. | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2, or (at your option) | |
16 | * any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | */ | |
27 | ||
136f7a1c MS |
28 | #define KMSG_COMPONENT "ap" |
29 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
30 | ||
62d146ff | 31 | #include <linux/kernel_stat.h> |
1534c382 MS |
32 | #include <linux/module.h> |
33 | #include <linux/init.h> | |
34 | #include <linux/delay.h> | |
35 | #include <linux/err.h> | |
36 | #include <linux/interrupt.h> | |
37 | #include <linux/workqueue.h> | |
5a0e3ad6 | 38 | #include <linux/slab.h> |
1534c382 MS |
39 | #include <linux/notifier.h> |
40 | #include <linux/kthread.h> | |
41 | #include <linux/mutex.h> | |
85eca850 | 42 | #include <asm/reset.h> |
cb17a636 | 43 | #include <asm/airq.h> |
60063497 | 44 | #include <linux/atomic.h> |
cb17a636 FB |
45 | #include <asm/system.h> |
46 | #include <asm/isc.h> | |
fe137230 FB |
47 | #include <linux/hrtimer.h> |
48 | #include <linux/ktime.h> | |
1534c382 MS |
49 | |
50 | #include "ap_bus.h" | |
51 | ||
52 | /* Some prototypes. */ | |
4927b3f7 | 53 | static void ap_scan_bus(struct work_struct *); |
1534c382 | 54 | static void ap_poll_all(unsigned long); |
fe137230 | 55 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *); |
1534c382 MS |
56 | static int ap_poll_thread_start(void); |
57 | static void ap_poll_thread_stop(void); | |
af512ed0 | 58 | static void ap_request_timeout(unsigned long); |
cb17a636 | 59 | static inline void ap_schedule_poll_timer(void); |
772f5472 FB |
60 | static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags); |
61 | static int ap_device_remove(struct device *dev); | |
62 | static int ap_device_probe(struct device *dev); | |
63 | static void ap_interrupt_handler(void *unused1, void *unused2); | |
64 | static void ap_reset(struct ap_device *ap_dev); | |
65 | static void ap_config_timeout(unsigned long ptr); | |
5314af69 | 66 | static int ap_select_domain(void); |
1534c382 | 67 | |
1749a81d | 68 | /* |
1534c382 MS |
69 | * Module description. |
70 | */ | |
71 | MODULE_AUTHOR("IBM Corporation"); | |
72 | MODULE_DESCRIPTION("Adjunct Processor Bus driver, " | |
73 | "Copyright 2006 IBM Corporation"); | |
74 | MODULE_LICENSE("GPL"); | |
75 | ||
1749a81d | 76 | /* |
1534c382 MS |
77 | * Module parameter |
78 | */ | |
79 | int ap_domain_index = -1; /* Adjunct Processor Domain Index */ | |
80 | module_param_named(domain, ap_domain_index, int, 0000); | |
81 | MODULE_PARM_DESC(domain, "domain index for ap devices"); | |
82 | EXPORT_SYMBOL(ap_domain_index); | |
83 | ||
b90b34c6 | 84 | static int ap_thread_flag = 0; |
1534c382 | 85 | module_param_named(poll_thread, ap_thread_flag, int, 0000); |
b90b34c6 | 86 | MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); |
1534c382 MS |
87 | |
88 | static struct device *ap_root_device = NULL; | |
43c207e6 | 89 | static DEFINE_SPINLOCK(ap_device_list_lock); |
cf352ce0 | 90 | static LIST_HEAD(ap_device_list); |
1534c382 | 91 | |
1749a81d | 92 | /* |
1534c382 MS |
93 | * Workqueue & timer for bus rescan. |
94 | */ | |
95 | static struct workqueue_struct *ap_work_queue; | |
96 | static struct timer_list ap_config_timer; | |
97 | static int ap_config_time = AP_CONFIG_TIME; | |
4927b3f7 | 98 | static DECLARE_WORK(ap_config_work, ap_scan_bus); |
1534c382 | 99 | |
1749a81d | 100 | /* |
cb17a636 | 101 | * Tasklet & timer for AP request polling and interrupts |
1534c382 | 102 | */ |
1534c382 MS |
103 | static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0); |
104 | static atomic_t ap_poll_requests = ATOMIC_INIT(0); | |
105 | static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); | |
106 | static struct task_struct *ap_poll_kthread = NULL; | |
107 | static DEFINE_MUTEX(ap_poll_thread_mutex); | |
93521314 | 108 | static DEFINE_SPINLOCK(ap_poll_timer_lock); |
cb17a636 | 109 | static void *ap_interrupt_indicator; |
fe137230 FB |
110 | static struct hrtimer ap_poll_timer; |
111 | /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. | |
112 | * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ | |
113 | static unsigned long long poll_timeout = 250000; | |
1534c382 | 114 | |
772f5472 FB |
115 | /* Suspend flag */ |
116 | static int ap_suspend_flag; | |
5314af69 FB |
117 | /* Flag to check if domain was set through module parameter domain=. This is |
118 | * important when supsend and resume is done in a z/VM environment where the | |
119 | * domain might change. */ | |
120 | static int user_set_domain = 0; | |
772f5472 FB |
121 | static struct bus_type ap_bus_type; |
122 | ||
cb17a636 FB |
123 | /** |
124 | * ap_using_interrupts() - Returns non-zero if interrupt support is | |
125 | * available. | |
126 | */ | |
127 | static inline int ap_using_interrupts(void) | |
128 | { | |
129 | return ap_interrupt_indicator != NULL; | |
130 | } | |
131 | ||
1534c382 | 132 | /** |
1749a81d | 133 | * ap_intructions_available() - Test if AP instructions are available. |
1534c382 | 134 | * |
1749a81d | 135 | * Returns 0 if the AP instructions are installed. |
1534c382 MS |
136 | */ |
137 | static inline int ap_instructions_available(void) | |
138 | { | |
139 | register unsigned long reg0 asm ("0") = AP_MKQID(0,0); | |
140 | register unsigned long reg1 asm ("1") = -ENODEV; | |
141 | register unsigned long reg2 asm ("2") = 0UL; | |
142 | ||
143 | asm volatile( | |
144 | " .long 0xb2af0000\n" /* PQAP(TAPQ) */ | |
145 | "0: la %1,0\n" | |
146 | "1:\n" | |
147 | EX_TABLE(0b, 1b) | |
148 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" ); | |
149 | return reg1; | |
150 | } | |
151 | ||
cb17a636 FB |
152 | /** |
153 | * ap_interrupts_available(): Test if AP interrupts are available. | |
154 | * | |
155 | * Returns 1 if AP interrupts are available. | |
156 | */ | |
157 | static int ap_interrupts_available(void) | |
158 | { | |
53ec24b1 | 159 | return test_facility(2) && test_facility(65); |
cb17a636 FB |
160 | } |
161 | ||
1534c382 | 162 | /** |
1749a81d FB |
163 | * ap_test_queue(): Test adjunct processor queue. |
164 | * @qid: The AP queue number | |
165 | * @queue_depth: Pointer to queue depth value | |
166 | * @device_type: Pointer to device type value | |
1534c382 | 167 | * |
1749a81d | 168 | * Returns AP queue status structure. |
1534c382 MS |
169 | */ |
170 | static inline struct ap_queue_status | |
171 | ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
172 | { | |
173 | register unsigned long reg0 asm ("0") = qid; | |
174 | register struct ap_queue_status reg1 asm ("1"); | |
175 | register unsigned long reg2 asm ("2") = 0UL; | |
176 | ||
177 | asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */ | |
178 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
179 | *device_type = (int) (reg2 >> 24); | |
180 | *queue_depth = (int) (reg2 & 0xff); | |
181 | return reg1; | |
182 | } | |
183 | ||
184 | /** | |
1749a81d FB |
185 | * ap_reset_queue(): Reset adjunct processor queue. |
186 | * @qid: The AP queue number | |
1534c382 | 187 | * |
1749a81d | 188 | * Returns AP queue status structure. |
1534c382 MS |
189 | */ |
190 | static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) | |
191 | { | |
192 | register unsigned long reg0 asm ("0") = qid | 0x01000000UL; | |
193 | register struct ap_queue_status reg1 asm ("1"); | |
194 | register unsigned long reg2 asm ("2") = 0UL; | |
195 | ||
196 | asm volatile( | |
197 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
198 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
199 | return reg1; | |
200 | } | |
201 | ||
cb17a636 FB |
202 | #ifdef CONFIG_64BIT |
203 | /** | |
204 | * ap_queue_interruption_control(): Enable interruption for a specific AP. | |
205 | * @qid: The AP queue number | |
206 | * @ind: The notification indicator byte | |
207 | * | |
208 | * Returns AP queue status. | |
209 | */ | |
210 | static inline struct ap_queue_status | |
211 | ap_queue_interruption_control(ap_qid_t qid, void *ind) | |
212 | { | |
213 | register unsigned long reg0 asm ("0") = qid | 0x03000000UL; | |
214 | register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC; | |
215 | register struct ap_queue_status reg1_out asm ("1"); | |
216 | register void *reg2 asm ("2") = ind; | |
217 | asm volatile( | |
218 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
219 | : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) | |
220 | : | |
221 | : "cc" ); | |
222 | return reg1_out; | |
223 | } | |
224 | #endif | |
225 | ||
6bed05bc HD |
226 | #ifdef CONFIG_64BIT |
227 | static inline struct ap_queue_status | |
228 | __ap_query_functions(ap_qid_t qid, unsigned int *functions) | |
b1f933da FB |
229 | { |
230 | register unsigned long reg0 asm ("0") = 0UL | qid | (1UL << 23); | |
6bed05bc HD |
231 | register struct ap_queue_status reg1 asm ("1") = AP_QUEUE_STATUS_INVALID; |
232 | register unsigned long reg2 asm ("2"); | |
b1f933da FB |
233 | |
234 | asm volatile( | |
235 | ".long 0xb2af0000\n" | |
6bed05bc HD |
236 | "0:\n" |
237 | EX_TABLE(0b, 0b) | |
238 | : "+d" (reg0), "+d" (reg1), "=d" (reg2) | |
b1f933da FB |
239 | : |
240 | : "cc"); | |
241 | ||
6bed05bc | 242 | *functions = (unsigned int)(reg2 >> 32); |
b1f933da FB |
243 | return reg1; |
244 | } | |
6bed05bc | 245 | #endif |
b1f933da FB |
246 | |
247 | /** | |
6bed05bc | 248 | * ap_query_functions(): Query supported functions. |
b1f933da | 249 | * @qid: The AP queue number |
6bed05bc | 250 | * @functions: Pointer to functions field. |
b1f933da | 251 | * |
6bed05bc HD |
252 | * Returns |
253 | * 0 on success. | |
254 | * -ENODEV if queue not valid. | |
255 | * -EBUSY if device busy. | |
256 | * -EINVAL if query function is not supported | |
b1f933da | 257 | */ |
6bed05bc | 258 | static int ap_query_functions(ap_qid_t qid, unsigned int *functions) |
b1f933da | 259 | { |
6bed05bc | 260 | #ifdef CONFIG_64BIT |
b1f933da | 261 | struct ap_queue_status status; |
6bed05bc HD |
262 | int i; |
263 | status = __ap_query_functions(qid, functions); | |
b1f933da FB |
264 | |
265 | for (i = 0; i < AP_MAX_RESET; i++) { | |
6bed05bc HD |
266 | if (ap_queue_status_invalid_test(&status)) |
267 | return -ENODEV; | |
268 | ||
b1f933da FB |
269 | switch (status.response_code) { |
270 | case AP_RESPONSE_NORMAL: | |
6bed05bc | 271 | return 0; |
b1f933da FB |
272 | case AP_RESPONSE_RESET_IN_PROGRESS: |
273 | case AP_RESPONSE_BUSY: | |
274 | break; | |
275 | case AP_RESPONSE_Q_NOT_AVAIL: | |
276 | case AP_RESPONSE_DECONFIGURED: | |
277 | case AP_RESPONSE_CHECKSTOPPED: | |
278 | case AP_RESPONSE_INVALID_ADDRESS: | |
6bed05bc | 279 | return -ENODEV; |
b1f933da FB |
280 | case AP_RESPONSE_OTHERWISE_CHANGED: |
281 | break; | |
282 | default: | |
283 | break; | |
284 | } | |
285 | if (i < AP_MAX_RESET - 1) { | |
286 | udelay(5); | |
6bed05bc | 287 | status = __ap_query_functions(qid, functions); |
b1f933da FB |
288 | } |
289 | } | |
6bed05bc HD |
290 | return -EBUSY; |
291 | #else | |
292 | return -EINVAL; | |
293 | #endif | |
294 | } | |
295 | ||
296 | /** | |
297 | * ap_4096_commands_availablen(): Check for availability of 4096 bit RSA | |
298 | * support. | |
299 | * @qid: The AP queue number | |
300 | * | |
301 | * Returns 1 if 4096 bit RSA keys are support fo the AP, returns 0 if not. | |
302 | */ | |
303 | int ap_4096_commands_available(ap_qid_t qid) | |
304 | { | |
305 | unsigned int functions; | |
306 | ||
307 | if (ap_query_functions(qid, &functions)) | |
308 | return 0; | |
309 | ||
310 | return test_ap_facility(functions, 1) && | |
311 | test_ap_facility(functions, 2); | |
b1f933da FB |
312 | } |
313 | EXPORT_SYMBOL(ap_4096_commands_available); | |
314 | ||
cb17a636 FB |
315 | /** |
316 | * ap_queue_enable_interruption(): Enable interruption on an AP. | |
317 | * @qid: The AP queue number | |
318 | * @ind: the notification indicator byte | |
319 | * | |
320 | * Enables interruption on AP queue via ap_queue_interruption_control(). Based | |
321 | * on the return value it waits a while and tests the AP queue if interrupts | |
322 | * have been switched on using ap_test_queue(). | |
323 | */ | |
324 | static int ap_queue_enable_interruption(ap_qid_t qid, void *ind) | |
325 | { | |
326 | #ifdef CONFIG_64BIT | |
327 | struct ap_queue_status status; | |
328 | int t_depth, t_device_type, rc, i; | |
329 | ||
330 | rc = -EBUSY; | |
331 | status = ap_queue_interruption_control(qid, ind); | |
332 | ||
333 | for (i = 0; i < AP_MAX_RESET; i++) { | |
334 | switch (status.response_code) { | |
335 | case AP_RESPONSE_NORMAL: | |
336 | if (status.int_enabled) | |
337 | return 0; | |
338 | break; | |
339 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
340 | case AP_RESPONSE_BUSY: | |
341 | break; | |
342 | case AP_RESPONSE_Q_NOT_AVAIL: | |
343 | case AP_RESPONSE_DECONFIGURED: | |
344 | case AP_RESPONSE_CHECKSTOPPED: | |
345 | case AP_RESPONSE_INVALID_ADDRESS: | |
346 | return -ENODEV; | |
347 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
348 | if (status.int_enabled) | |
349 | return 0; | |
350 | break; | |
351 | default: | |
352 | break; | |
353 | } | |
354 | if (i < AP_MAX_RESET - 1) { | |
355 | udelay(5); | |
356 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
357 | } | |
358 | } | |
359 | return rc; | |
360 | #else | |
361 | return -EINVAL; | |
362 | #endif | |
363 | } | |
364 | ||
1534c382 | 365 | /** |
1749a81d FB |
366 | * __ap_send(): Send message to adjunct processor queue. |
367 | * @qid: The AP queue number | |
368 | * @psmid: The program supplied message identifier | |
369 | * @msg: The message text | |
370 | * @length: The message length | |
a6a5d73a | 371 | * @special: Special Bit |
1534c382 | 372 | * |
1749a81d | 373 | * Returns AP queue status structure. |
1534c382 | 374 | * Condition code 1 on NQAP can't happen because the L bit is 1. |
1534c382 MS |
375 | * Condition code 2 on NQAP also means the send is incomplete, |
376 | * because a segment boundary was reached. The NQAP is repeated. | |
377 | */ | |
378 | static inline struct ap_queue_status | |
a6a5d73a FB |
379 | __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length, |
380 | unsigned int special) | |
1534c382 MS |
381 | { |
382 | typedef struct { char _[length]; } msgblock; | |
383 | register unsigned long reg0 asm ("0") = qid | 0x40000000UL; | |
384 | register struct ap_queue_status reg1 asm ("1"); | |
385 | register unsigned long reg2 asm ("2") = (unsigned long) msg; | |
386 | register unsigned long reg3 asm ("3") = (unsigned long) length; | |
387 | register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32); | |
388 | register unsigned long reg5 asm ("5") = (unsigned int) psmid; | |
389 | ||
a6a5d73a FB |
390 | if (special == 1) |
391 | reg0 |= 0x400000UL; | |
392 | ||
1534c382 MS |
393 | asm volatile ( |
394 | "0: .long 0xb2ad0042\n" /* DQAP */ | |
395 | " brc 2,0b" | |
396 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) | |
397 | : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) | |
398 | : "cc" ); | |
399 | return reg1; | |
400 | } | |
401 | ||
402 | int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
403 | { | |
404 | struct ap_queue_status status; | |
405 | ||
a6a5d73a | 406 | status = __ap_send(qid, psmid, msg, length, 0); |
1534c382 MS |
407 | switch (status.response_code) { |
408 | case AP_RESPONSE_NORMAL: | |
409 | return 0; | |
410 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 411 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 | 412 | return -EBUSY; |
a6a5d73a FB |
413 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
414 | return -EINVAL; | |
1534c382 MS |
415 | default: /* Device is gone. */ |
416 | return -ENODEV; | |
417 | } | |
418 | } | |
419 | EXPORT_SYMBOL(ap_send); | |
420 | ||
1749a81d FB |
421 | /** |
422 | * __ap_recv(): Receive message from adjunct processor queue. | |
423 | * @qid: The AP queue number | |
424 | * @psmid: Pointer to program supplied message identifier | |
425 | * @msg: The message text | |
426 | * @length: The message length | |
1534c382 | 427 | * |
1749a81d | 428 | * Returns AP queue status structure. |
1534c382 MS |
429 | * Condition code 1 on DQAP means the receive has taken place |
430 | * but only partially. The response is incomplete, hence the | |
431 | * DQAP is repeated. | |
1534c382 MS |
432 | * Condition code 2 on DQAP also means the receive is incomplete, |
433 | * this time because a segment boundary was reached. Again, the | |
434 | * DQAP is repeated. | |
1534c382 MS |
435 | * Note that gpr2 is used by the DQAP instruction to keep track of |
436 | * any 'residual' length, in case the instruction gets interrupted. | |
437 | * Hence it gets zeroed before the instruction. | |
438 | */ | |
439 | static inline struct ap_queue_status | |
440 | __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
441 | { | |
442 | typedef struct { char _[length]; } msgblock; | |
443 | register unsigned long reg0 asm("0") = qid | 0x80000000UL; | |
444 | register struct ap_queue_status reg1 asm ("1"); | |
445 | register unsigned long reg2 asm("2") = 0UL; | |
446 | register unsigned long reg4 asm("4") = (unsigned long) msg; | |
447 | register unsigned long reg5 asm("5") = (unsigned long) length; | |
448 | register unsigned long reg6 asm("6") = 0UL; | |
449 | register unsigned long reg7 asm("7") = 0UL; | |
450 | ||
451 | ||
452 | asm volatile( | |
453 | "0: .long 0xb2ae0064\n" | |
454 | " brc 6,0b\n" | |
455 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), | |
456 | "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), | |
457 | "=m" (*(msgblock *) msg) : : "cc" ); | |
458 | *psmid = (((unsigned long long) reg6) << 32) + reg7; | |
459 | return reg1; | |
460 | } | |
461 | ||
462 | int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
463 | { | |
464 | struct ap_queue_status status; | |
465 | ||
466 | status = __ap_recv(qid, psmid, msg, length); | |
467 | switch (status.response_code) { | |
468 | case AP_RESPONSE_NORMAL: | |
469 | return 0; | |
470 | case AP_RESPONSE_NO_PENDING_REPLY: | |
471 | if (status.queue_empty) | |
472 | return -ENOENT; | |
473 | return -EBUSY; | |
af512ed0 RW |
474 | case AP_RESPONSE_RESET_IN_PROGRESS: |
475 | return -EBUSY; | |
1534c382 MS |
476 | default: |
477 | return -ENODEV; | |
478 | } | |
479 | } | |
480 | EXPORT_SYMBOL(ap_recv); | |
481 | ||
482 | /** | |
1749a81d FB |
483 | * ap_query_queue(): Check if an AP queue is available. |
484 | * @qid: The AP queue number | |
485 | * @queue_depth: Pointer to queue depth value | |
486 | * @device_type: Pointer to device type value | |
487 | * | |
488 | * The test is repeated for AP_MAX_RESET times. | |
1534c382 MS |
489 | */ |
490 | static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
491 | { | |
492 | struct ap_queue_status status; | |
493 | int t_depth, t_device_type, rc, i; | |
494 | ||
495 | rc = -EBUSY; | |
496 | for (i = 0; i < AP_MAX_RESET; i++) { | |
497 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
498 | switch (status.response_code) { | |
499 | case AP_RESPONSE_NORMAL: | |
500 | *queue_depth = t_depth + 1; | |
501 | *device_type = t_device_type; | |
502 | rc = 0; | |
503 | break; | |
504 | case AP_RESPONSE_Q_NOT_AVAIL: | |
505 | rc = -ENODEV; | |
506 | break; | |
507 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
508 | break; | |
509 | case AP_RESPONSE_DECONFIGURED: | |
510 | rc = -ENODEV; | |
511 | break; | |
512 | case AP_RESPONSE_CHECKSTOPPED: | |
513 | rc = -ENODEV; | |
514 | break; | |
cb17a636 FB |
515 | case AP_RESPONSE_INVALID_ADDRESS: |
516 | rc = -ENODEV; | |
517 | break; | |
518 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
519 | break; | |
1534c382 MS |
520 | case AP_RESPONSE_BUSY: |
521 | break; | |
522 | default: | |
523 | BUG(); | |
524 | } | |
525 | if (rc != -EBUSY) | |
526 | break; | |
527 | if (i < AP_MAX_RESET - 1) | |
528 | udelay(5); | |
529 | } | |
530 | return rc; | |
531 | } | |
532 | ||
533 | /** | |
1749a81d FB |
534 | * ap_init_queue(): Reset an AP queue. |
535 | * @qid: The AP queue number | |
536 | * | |
1534c382 | 537 | * Reset an AP queue and wait for it to become available again. |
1534c382 MS |
538 | */ |
539 | static int ap_init_queue(ap_qid_t qid) | |
540 | { | |
541 | struct ap_queue_status status; | |
542 | int rc, dummy, i; | |
543 | ||
544 | rc = -ENODEV; | |
545 | status = ap_reset_queue(qid); | |
546 | for (i = 0; i < AP_MAX_RESET; i++) { | |
547 | switch (status.response_code) { | |
548 | case AP_RESPONSE_NORMAL: | |
549 | if (status.queue_empty) | |
550 | rc = 0; | |
551 | break; | |
552 | case AP_RESPONSE_Q_NOT_AVAIL: | |
553 | case AP_RESPONSE_DECONFIGURED: | |
554 | case AP_RESPONSE_CHECKSTOPPED: | |
555 | i = AP_MAX_RESET; /* return with -ENODEV */ | |
556 | break; | |
557 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
af512ed0 | 558 | rc = -EBUSY; |
1534c382 MS |
559 | case AP_RESPONSE_BUSY: |
560 | default: | |
561 | break; | |
562 | } | |
af512ed0 | 563 | if (rc != -ENODEV && rc != -EBUSY) |
1534c382 MS |
564 | break; |
565 | if (i < AP_MAX_RESET - 1) { | |
566 | udelay(5); | |
567 | status = ap_test_queue(qid, &dummy, &dummy); | |
568 | } | |
569 | } | |
cb17a636 FB |
570 | if (rc == 0 && ap_using_interrupts()) { |
571 | rc = ap_queue_enable_interruption(qid, ap_interrupt_indicator); | |
572 | /* If interruption mode is supported by the machine, | |
573 | * but an AP can not be enabled for interruption then | |
574 | * the AP will be discarded. */ | |
575 | if (rc) | |
576 | pr_err("Registering adapter interrupts for " | |
577 | "AP %d failed\n", AP_QID_DEVICE(qid)); | |
578 | } | |
1534c382 MS |
579 | return rc; |
580 | } | |
581 | ||
af512ed0 | 582 | /** |
1749a81d FB |
583 | * ap_increase_queue_count(): Arm request timeout. |
584 | * @ap_dev: Pointer to an AP device. | |
585 | * | |
586 | * Arm request timeout if an AP device was idle and a new request is submitted. | |
af512ed0 RW |
587 | */ |
588 | static void ap_increase_queue_count(struct ap_device *ap_dev) | |
589 | { | |
590 | int timeout = ap_dev->drv->request_timeout; | |
591 | ||
592 | ap_dev->queue_count++; | |
593 | if (ap_dev->queue_count == 1) { | |
594 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
595 | ap_dev->reset = AP_RESET_ARMED; | |
596 | } | |
597 | } | |
598 | ||
599 | /** | |
1749a81d FB |
600 | * ap_decrease_queue_count(): Decrease queue count. |
601 | * @ap_dev: Pointer to an AP device. | |
602 | * | |
603 | * If AP device is still alive, re-schedule request timeout if there are still | |
af512ed0 RW |
604 | * pending requests. |
605 | */ | |
606 | static void ap_decrease_queue_count(struct ap_device *ap_dev) | |
607 | { | |
608 | int timeout = ap_dev->drv->request_timeout; | |
609 | ||
610 | ap_dev->queue_count--; | |
611 | if (ap_dev->queue_count > 0) | |
612 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
613 | else | |
1749a81d | 614 | /* |
af512ed0 RW |
615 | * The timeout timer should to be disabled now - since |
616 | * del_timer_sync() is very expensive, we just tell via the | |
617 | * reset flag to ignore the pending timeout timer. | |
618 | */ | |
619 | ap_dev->reset = AP_RESET_IGNORE; | |
620 | } | |
621 | ||
1749a81d | 622 | /* |
1534c382 MS |
623 | * AP device related attributes. |
624 | */ | |
625 | static ssize_t ap_hwtype_show(struct device *dev, | |
626 | struct device_attribute *attr, char *buf) | |
627 | { | |
628 | struct ap_device *ap_dev = to_ap_dev(dev); | |
629 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); | |
630 | } | |
1534c382 | 631 | |
43c207e6 | 632 | static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); |
1534c382 MS |
633 | static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr, |
634 | char *buf) | |
635 | { | |
636 | struct ap_device *ap_dev = to_ap_dev(dev); | |
637 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth); | |
638 | } | |
1534c382 | 639 | |
43c207e6 | 640 | static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); |
1534c382 MS |
641 | static ssize_t ap_request_count_show(struct device *dev, |
642 | struct device_attribute *attr, | |
643 | char *buf) | |
644 | { | |
645 | struct ap_device *ap_dev = to_ap_dev(dev); | |
646 | int rc; | |
647 | ||
648 | spin_lock_bh(&ap_dev->lock); | |
649 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count); | |
650 | spin_unlock_bh(&ap_dev->lock); | |
651 | return rc; | |
652 | } | |
653 | ||
654 | static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); | |
655 | ||
656 | static ssize_t ap_modalias_show(struct device *dev, | |
657 | struct device_attribute *attr, char *buf) | |
658 | { | |
659 | return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type); | |
660 | } | |
661 | ||
662 | static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); | |
663 | ||
664 | static struct attribute *ap_dev_attrs[] = { | |
665 | &dev_attr_hwtype.attr, | |
666 | &dev_attr_depth.attr, | |
667 | &dev_attr_request_count.attr, | |
668 | &dev_attr_modalias.attr, | |
669 | NULL | |
670 | }; | |
671 | static struct attribute_group ap_dev_attr_group = { | |
672 | .attrs = ap_dev_attrs | |
673 | }; | |
674 | ||
675 | /** | |
1749a81d FB |
676 | * ap_bus_match() |
677 | * @dev: Pointer to device | |
678 | * @drv: Pointer to device_driver | |
679 | * | |
1534c382 MS |
680 | * AP bus driver registration/unregistration. |
681 | */ | |
682 | static int ap_bus_match(struct device *dev, struct device_driver *drv) | |
683 | { | |
684 | struct ap_device *ap_dev = to_ap_dev(dev); | |
685 | struct ap_driver *ap_drv = to_ap_drv(drv); | |
686 | struct ap_device_id *id; | |
687 | ||
1749a81d | 688 | /* |
1534c382 MS |
689 | * Compare device type of the device with the list of |
690 | * supported types of the device_driver. | |
691 | */ | |
692 | for (id = ap_drv->ids; id->match_flags; id++) { | |
693 | if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) && | |
694 | (id->dev_type != ap_dev->device_type)) | |
695 | continue; | |
696 | return 1; | |
697 | } | |
698 | return 0; | |
699 | } | |
700 | ||
701 | /** | |
1749a81d FB |
702 | * ap_uevent(): Uevent function for AP devices. |
703 | * @dev: Pointer to device | |
704 | * @env: Pointer to kobj_uevent_env | |
705 | * | |
706 | * It sets up a single environment variable DEV_TYPE which contains the | |
707 | * hardware device type. | |
1534c382 | 708 | */ |
7eff2e7a | 709 | static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) |
1534c382 MS |
710 | { |
711 | struct ap_device *ap_dev = to_ap_dev(dev); | |
7eff2e7a | 712 | int retval = 0; |
1534c382 MS |
713 | |
714 | if (!ap_dev) | |
715 | return -ENODEV; | |
716 | ||
717 | /* Set up DEV_TYPE environment variable. */ | |
7eff2e7a | 718 | retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); |
bf62456e ER |
719 | if (retval) |
720 | return retval; | |
721 | ||
66a4263b | 722 | /* Add MODALIAS= */ |
7eff2e7a | 723 | retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); |
bf62456e | 724 | |
bf62456e | 725 | return retval; |
1534c382 MS |
726 | } |
727 | ||
772f5472 FB |
728 | static int ap_bus_suspend(struct device *dev, pm_message_t state) |
729 | { | |
730 | struct ap_device *ap_dev = to_ap_dev(dev); | |
731 | unsigned long flags; | |
732 | ||
733 | if (!ap_suspend_flag) { | |
734 | ap_suspend_flag = 1; | |
735 | ||
736 | /* Disable scanning for devices, thus we do not want to scan | |
737 | * for them after removing. | |
738 | */ | |
739 | del_timer_sync(&ap_config_timer); | |
740 | if (ap_work_queue != NULL) { | |
741 | destroy_workqueue(ap_work_queue); | |
742 | ap_work_queue = NULL; | |
743 | } | |
5314af69 | 744 | |
772f5472 FB |
745 | tasklet_disable(&ap_tasklet); |
746 | } | |
747 | /* Poll on the device until all requests are finished. */ | |
748 | do { | |
749 | flags = 0; | |
95f1556c | 750 | spin_lock_bh(&ap_dev->lock); |
772f5472 | 751 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 752 | spin_unlock_bh(&ap_dev->lock); |
772f5472 FB |
753 | } while ((flags & 1) || (flags & 2)); |
754 | ||
5314af69 FB |
755 | spin_lock_bh(&ap_dev->lock); |
756 | ap_dev->unregistered = 1; | |
757 | spin_unlock_bh(&ap_dev->lock); | |
758 | ||
772f5472 FB |
759 | return 0; |
760 | } | |
761 | ||
762 | static int ap_bus_resume(struct device *dev) | |
763 | { | |
764 | int rc = 0; | |
765 | struct ap_device *ap_dev = to_ap_dev(dev); | |
766 | ||
767 | if (ap_suspend_flag) { | |
768 | ap_suspend_flag = 0; | |
769 | if (!ap_interrupts_available()) | |
770 | ap_interrupt_indicator = NULL; | |
5314af69 FB |
771 | if (!user_set_domain) { |
772 | ap_domain_index = -1; | |
773 | ap_select_domain(); | |
774 | } | |
772f5472 FB |
775 | init_timer(&ap_config_timer); |
776 | ap_config_timer.function = ap_config_timeout; | |
777 | ap_config_timer.data = 0; | |
778 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
779 | add_timer(&ap_config_timer); | |
780 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
781 | if (!ap_work_queue) | |
782 | return -ENOMEM; | |
783 | tasklet_enable(&ap_tasklet); | |
784 | if (!ap_using_interrupts()) | |
785 | ap_schedule_poll_timer(); | |
786 | else | |
787 | tasklet_schedule(&ap_tasklet); | |
788 | if (ap_thread_flag) | |
789 | rc = ap_poll_thread_start(); | |
772f5472 | 790 | } |
5314af69 FB |
791 | if (AP_QID_QUEUE(ap_dev->qid) != ap_domain_index) { |
792 | spin_lock_bh(&ap_dev->lock); | |
793 | ap_dev->qid = AP_MKQID(AP_QID_DEVICE(ap_dev->qid), | |
794 | ap_domain_index); | |
795 | spin_unlock_bh(&ap_dev->lock); | |
796 | } | |
797 | queue_work(ap_work_queue, &ap_config_work); | |
772f5472 FB |
798 | |
799 | return rc; | |
800 | } | |
801 | ||
1534c382 MS |
802 | static struct bus_type ap_bus_type = { |
803 | .name = "ap", | |
804 | .match = &ap_bus_match, | |
805 | .uevent = &ap_uevent, | |
772f5472 FB |
806 | .suspend = ap_bus_suspend, |
807 | .resume = ap_bus_resume | |
1534c382 MS |
808 | }; |
809 | ||
810 | static int ap_device_probe(struct device *dev) | |
811 | { | |
812 | struct ap_device *ap_dev = to_ap_dev(dev); | |
813 | struct ap_driver *ap_drv = to_ap_drv(dev->driver); | |
814 | int rc; | |
815 | ||
816 | ap_dev->drv = ap_drv; | |
817 | rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; | |
faa582ca | 818 | if (!rc) { |
43c207e6 | 819 | spin_lock_bh(&ap_device_list_lock); |
faa582ca | 820 | list_add(&ap_dev->list, &ap_device_list); |
43c207e6 | 821 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca | 822 | } |
1534c382 MS |
823 | return rc; |
824 | } | |
825 | ||
826 | /** | |
1749a81d FB |
827 | * __ap_flush_queue(): Flush requests. |
828 | * @ap_dev: Pointer to the AP device | |
829 | * | |
1534c382 | 830 | * Flush all requests from the request/pending queue of an AP device. |
1534c382 | 831 | */ |
4d284cac | 832 | static void __ap_flush_queue(struct ap_device *ap_dev) |
1534c382 MS |
833 | { |
834 | struct ap_message *ap_msg, *next; | |
835 | ||
836 | list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) { | |
837 | list_del_init(&ap_msg->list); | |
838 | ap_dev->pendingq_count--; | |
839 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
840 | } | |
841 | list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) { | |
842 | list_del_init(&ap_msg->list); | |
843 | ap_dev->requestq_count--; | |
844 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
845 | } | |
846 | } | |
847 | ||
848 | void ap_flush_queue(struct ap_device *ap_dev) | |
849 | { | |
850 | spin_lock_bh(&ap_dev->lock); | |
851 | __ap_flush_queue(ap_dev); | |
852 | spin_unlock_bh(&ap_dev->lock); | |
853 | } | |
854 | EXPORT_SYMBOL(ap_flush_queue); | |
855 | ||
856 | static int ap_device_remove(struct device *dev) | |
857 | { | |
858 | struct ap_device *ap_dev = to_ap_dev(dev); | |
859 | struct ap_driver *ap_drv = ap_dev->drv; | |
860 | ||
4e56296d | 861 | ap_flush_queue(ap_dev); |
af512ed0 | 862 | del_timer_sync(&ap_dev->timeout); |
43c207e6 | 863 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 864 | list_del_init(&ap_dev->list); |
43c207e6 | 865 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca RW |
866 | if (ap_drv->remove) |
867 | ap_drv->remove(ap_dev); | |
e675c0d2 RW |
868 | spin_lock_bh(&ap_dev->lock); |
869 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
870 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
871 | return 0; |
872 | } | |
873 | ||
874 | int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, | |
875 | char *name) | |
876 | { | |
877 | struct device_driver *drv = &ap_drv->driver; | |
878 | ||
879 | drv->bus = &ap_bus_type; | |
880 | drv->probe = ap_device_probe; | |
881 | drv->remove = ap_device_remove; | |
882 | drv->owner = owner; | |
883 | drv->name = name; | |
884 | return driver_register(drv); | |
885 | } | |
886 | EXPORT_SYMBOL(ap_driver_register); | |
887 | ||
888 | void ap_driver_unregister(struct ap_driver *ap_drv) | |
889 | { | |
890 | driver_unregister(&ap_drv->driver); | |
891 | } | |
892 | EXPORT_SYMBOL(ap_driver_unregister); | |
893 | ||
1749a81d | 894 | /* |
1534c382 MS |
895 | * AP bus attributes. |
896 | */ | |
897 | static ssize_t ap_domain_show(struct bus_type *bus, char *buf) | |
898 | { | |
899 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); | |
900 | } | |
901 | ||
902 | static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL); | |
903 | ||
904 | static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) | |
905 | { | |
906 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); | |
907 | } | |
908 | ||
cb17a636 FB |
909 | static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) |
910 | { | |
911 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
912 | ap_using_interrupts() ? 1 : 0); | |
913 | } | |
914 | ||
915 | static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); | |
916 | ||
1534c382 MS |
917 | static ssize_t ap_config_time_store(struct bus_type *bus, |
918 | const char *buf, size_t count) | |
919 | { | |
920 | int time; | |
921 | ||
922 | if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) | |
923 | return -EINVAL; | |
924 | ap_config_time = time; | |
925 | if (!timer_pending(&ap_config_timer) || | |
926 | !mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) { | |
927 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
928 | add_timer(&ap_config_timer); | |
929 | } | |
930 | return count; | |
931 | } | |
932 | ||
933 | static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); | |
934 | ||
935 | static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) | |
936 | { | |
937 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); | |
938 | } | |
939 | ||
940 | static ssize_t ap_poll_thread_store(struct bus_type *bus, | |
941 | const char *buf, size_t count) | |
942 | { | |
943 | int flag, rc; | |
944 | ||
945 | if (sscanf(buf, "%d\n", &flag) != 1) | |
946 | return -EINVAL; | |
947 | if (flag) { | |
948 | rc = ap_poll_thread_start(); | |
949 | if (rc) | |
950 | return rc; | |
951 | } | |
952 | else | |
953 | ap_poll_thread_stop(); | |
954 | return count; | |
955 | } | |
956 | ||
957 | static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); | |
958 | ||
fe137230 FB |
959 | static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) |
960 | { | |
961 | return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); | |
962 | } | |
963 | ||
964 | static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, | |
965 | size_t count) | |
966 | { | |
967 | unsigned long long time; | |
968 | ktime_t hr_time; | |
969 | ||
970 | /* 120 seconds = maximum poll interval */ | |
cb17a636 FB |
971 | if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || |
972 | time > 120000000000ULL) | |
fe137230 FB |
973 | return -EINVAL; |
974 | poll_timeout = time; | |
975 | hr_time = ktime_set(0, poll_timeout); | |
976 | ||
977 | if (!hrtimer_is_queued(&ap_poll_timer) || | |
6c644eae AV |
978 | !hrtimer_forward(&ap_poll_timer, hrtimer_get_expires(&ap_poll_timer), hr_time)) { |
979 | hrtimer_set_expires(&ap_poll_timer, hr_time); | |
980 | hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); | |
fe137230 FB |
981 | } |
982 | return count; | |
983 | } | |
984 | ||
985 | static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); | |
986 | ||
1534c382 MS |
987 | static struct bus_attribute *const ap_bus_attrs[] = { |
988 | &bus_attr_ap_domain, | |
989 | &bus_attr_config_time, | |
990 | &bus_attr_poll_thread, | |
cb17a636 | 991 | &bus_attr_ap_interrupts, |
fe137230 FB |
992 | &bus_attr_poll_timeout, |
993 | NULL, | |
1534c382 MS |
994 | }; |
995 | ||
996 | /** | |
1749a81d FB |
997 | * ap_select_domain(): Select an AP domain. |
998 | * | |
999 | * Pick one of the 16 AP domains. | |
1534c382 | 1000 | */ |
4d284cac | 1001 | static int ap_select_domain(void) |
1534c382 MS |
1002 | { |
1003 | int queue_depth, device_type, count, max_count, best_domain; | |
1004 | int rc, i, j; | |
1005 | ||
1749a81d | 1006 | /* |
1534c382 MS |
1007 | * We want to use a single domain. Either the one specified with |
1008 | * the "domain=" parameter or the domain with the maximum number | |
1009 | * of devices. | |
1010 | */ | |
1011 | if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS) | |
1012 | /* Domain has already been selected. */ | |
1013 | return 0; | |
1014 | best_domain = -1; | |
1015 | max_count = 0; | |
1016 | for (i = 0; i < AP_DOMAINS; i++) { | |
1017 | count = 0; | |
1018 | for (j = 0; j < AP_DEVICES; j++) { | |
1019 | ap_qid_t qid = AP_MKQID(j, i); | |
1020 | rc = ap_query_queue(qid, &queue_depth, &device_type); | |
1021 | if (rc) | |
1022 | continue; | |
1023 | count++; | |
1024 | } | |
1025 | if (count > max_count) { | |
1026 | max_count = count; | |
1027 | best_domain = i; | |
1028 | } | |
1029 | } | |
1030 | if (best_domain >= 0){ | |
1031 | ap_domain_index = best_domain; | |
1032 | return 0; | |
1033 | } | |
1034 | return -ENODEV; | |
1035 | } | |
1036 | ||
1037 | /** | |
1749a81d | 1038 | * ap_probe_device_type(): Find the device type of an AP. |
1534c382 | 1039 | * @ap_dev: pointer to the AP device. |
1749a81d FB |
1040 | * |
1041 | * Find the device type if query queue returned a device type of 0. | |
1534c382 MS |
1042 | */ |
1043 | static int ap_probe_device_type(struct ap_device *ap_dev) | |
1044 | { | |
1045 | static unsigned char msg[] = { | |
1046 | 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00, | |
1047 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1048 | 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00, | |
1049 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1050 | 0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50, | |
1051 | 0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01, | |
1052 | 0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00, | |
1053 | 0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00, | |
1054 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1055 | 0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00, | |
1056 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1057 | 0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00, | |
1058 | 0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00, | |
1059 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1060 | 0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00, | |
1061 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1062 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1063 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1064 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1065 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1066 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1067 | 0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00, | |
1068 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1069 | 0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00, | |
1070 | 0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20, | |
1071 | 0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53, | |
1072 | 0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22, | |
1073 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
1074 | 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88, | |
1075 | 0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66, | |
1076 | 0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44, | |
1077 | 0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22, | |
1078 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
1079 | 0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77, | |
1080 | 0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00, | |
1081 | 0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00, | |
1082 | 0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01, | |
1083 | 0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c, | |
1084 | 0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68, | |
1085 | 0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66, | |
1086 | 0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0, | |
1087 | 0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8, | |
1088 | 0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04, | |
1089 | 0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57, | |
1090 | 0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d, | |
1091 | }; | |
1092 | struct ap_queue_status status; | |
1093 | unsigned long long psmid; | |
1094 | char *reply; | |
1095 | int rc, i; | |
1096 | ||
1097 | reply = (void *) get_zeroed_page(GFP_KERNEL); | |
1098 | if (!reply) { | |
1099 | rc = -ENOMEM; | |
1100 | goto out; | |
1101 | } | |
1102 | ||
1103 | status = __ap_send(ap_dev->qid, 0x0102030405060708ULL, | |
a6a5d73a | 1104 | msg, sizeof(msg), 0); |
1534c382 MS |
1105 | if (status.response_code != AP_RESPONSE_NORMAL) { |
1106 | rc = -ENODEV; | |
1107 | goto out_free; | |
1108 | } | |
1109 | ||
1110 | /* Wait for the test message to complete. */ | |
1111 | for (i = 0; i < 6; i++) { | |
1112 | mdelay(300); | |
1113 | status = __ap_recv(ap_dev->qid, &psmid, reply, 4096); | |
1114 | if (status.response_code == AP_RESPONSE_NORMAL && | |
1115 | psmid == 0x0102030405060708ULL) | |
1116 | break; | |
1117 | } | |
1118 | if (i < 6) { | |
1119 | /* Got an answer. */ | |
1120 | if (reply[0] == 0x00 && reply[1] == 0x86) | |
1121 | ap_dev->device_type = AP_DEVICE_TYPE_PCICC; | |
1122 | else | |
1123 | ap_dev->device_type = AP_DEVICE_TYPE_PCICA; | |
1124 | rc = 0; | |
1125 | } else | |
1126 | rc = -ENODEV; | |
1127 | ||
1128 | out_free: | |
1129 | free_page((unsigned long) reply); | |
1130 | out: | |
1131 | return rc; | |
1132 | } | |
1133 | ||
cb17a636 FB |
1134 | static void ap_interrupt_handler(void *unused1, void *unused2) |
1135 | { | |
62d146ff | 1136 | kstat_cpu(smp_processor_id()).irqs[IOINT_APB]++; |
cb17a636 FB |
1137 | tasklet_schedule(&ap_tasklet); |
1138 | } | |
1139 | ||
1534c382 | 1140 | /** |
1749a81d FB |
1141 | * __ap_scan_bus(): Scan the AP bus. |
1142 | * @dev: Pointer to device | |
1143 | * @data: Pointer to data | |
1144 | * | |
1145 | * Scan the AP bus for new devices. | |
1534c382 MS |
1146 | */ |
1147 | static int __ap_scan_bus(struct device *dev, void *data) | |
1148 | { | |
1149 | return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data; | |
1150 | } | |
1151 | ||
1152 | static void ap_device_release(struct device *dev) | |
1153 | { | |
1154 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1155 | ||
1156 | kfree(ap_dev); | |
1157 | } | |
1158 | ||
4927b3f7 | 1159 | static void ap_scan_bus(struct work_struct *unused) |
1534c382 MS |
1160 | { |
1161 | struct ap_device *ap_dev; | |
1162 | struct device *dev; | |
1163 | ap_qid_t qid; | |
1164 | int queue_depth, device_type; | |
6bed05bc | 1165 | unsigned int device_functions; |
1534c382 MS |
1166 | int rc, i; |
1167 | ||
1168 | if (ap_select_domain() != 0) | |
1169 | return; | |
1170 | for (i = 0; i < AP_DEVICES; i++) { | |
1171 | qid = AP_MKQID(i, ap_domain_index); | |
1172 | dev = bus_find_device(&ap_bus_type, NULL, | |
1173 | (void *)(unsigned long)qid, | |
1174 | __ap_scan_bus); | |
f3b017d8 | 1175 | rc = ap_query_queue(qid, &queue_depth, &device_type); |
c6a48264 | 1176 | if (dev) { |
af512ed0 RW |
1177 | if (rc == -EBUSY) { |
1178 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1179 | schedule_timeout(AP_RESET_TIMEOUT); | |
1180 | rc = ap_query_queue(qid, &queue_depth, | |
1181 | &device_type); | |
1182 | } | |
c6a48264 RW |
1183 | ap_dev = to_ap_dev(dev); |
1184 | spin_lock_bh(&ap_dev->lock); | |
1185 | if (rc || ap_dev->unregistered) { | |
1186 | spin_unlock_bh(&ap_dev->lock); | |
5314af69 FB |
1187 | if (ap_dev->unregistered) |
1188 | i--; | |
c6a48264 | 1189 | device_unregister(dev); |
af512ed0 | 1190 | put_device(dev); |
c6a48264 | 1191 | continue; |
af512ed0 RW |
1192 | } |
1193 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
1194 | put_device(dev); |
1195 | continue; | |
1196 | } | |
1534c382 MS |
1197 | if (rc) |
1198 | continue; | |
1199 | rc = ap_init_queue(qid); | |
1200 | if (rc) | |
1201 | continue; | |
1202 | ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL); | |
1203 | if (!ap_dev) | |
1204 | break; | |
1205 | ap_dev->qid = qid; | |
1206 | ap_dev->queue_depth = queue_depth; | |
4e56296d | 1207 | ap_dev->unregistered = 1; |
1534c382 MS |
1208 | spin_lock_init(&ap_dev->lock); |
1209 | INIT_LIST_HEAD(&ap_dev->pendingq); | |
1210 | INIT_LIST_HEAD(&ap_dev->requestq); | |
cf352ce0 | 1211 | INIT_LIST_HEAD(&ap_dev->list); |
af512ed0 RW |
1212 | setup_timer(&ap_dev->timeout, ap_request_timeout, |
1213 | (unsigned long) ap_dev); | |
6bed05bc HD |
1214 | switch (device_type) { |
1215 | case 0: | |
cf2d007b HD |
1216 | if (ap_probe_device_type(ap_dev)) { |
1217 | kfree(ap_dev); | |
1218 | continue; | |
1219 | } | |
6bed05bc HD |
1220 | break; |
1221 | case 10: | |
1222 | if (ap_query_functions(qid, &device_functions)) { | |
1223 | kfree(ap_dev); | |
1224 | continue; | |
1225 | } | |
1226 | if (test_ap_facility(device_functions, 3)) | |
1227 | ap_dev->device_type = AP_DEVICE_TYPE_CEX3C; | |
1228 | else if (test_ap_facility(device_functions, 4)) | |
1229 | ap_dev->device_type = AP_DEVICE_TYPE_CEX3A; | |
1230 | else { | |
1231 | kfree(ap_dev); | |
1232 | continue; | |
1233 | } | |
1234 | break; | |
1235 | default: | |
1534c382 | 1236 | ap_dev->device_type = device_type; |
6bed05bc | 1237 | } |
1534c382 MS |
1238 | |
1239 | ap_dev->device.bus = &ap_bus_type; | |
1240 | ap_dev->device.parent = ap_root_device; | |
edc44fa0 FB |
1241 | if (dev_set_name(&ap_dev->device, "card%02x", |
1242 | AP_QID_DEVICE(ap_dev->qid))) { | |
1243 | kfree(ap_dev); | |
1244 | continue; | |
1245 | } | |
1534c382 MS |
1246 | ap_dev->device.release = ap_device_release; |
1247 | rc = device_register(&ap_dev->device); | |
1248 | if (rc) { | |
c6304933 | 1249 | put_device(&ap_dev->device); |
1534c382 MS |
1250 | continue; |
1251 | } | |
1252 | /* Add device attributes. */ | |
1253 | rc = sysfs_create_group(&ap_dev->device.kobj, | |
1254 | &ap_dev_attr_group); | |
4e56296d RW |
1255 | if (!rc) { |
1256 | spin_lock_bh(&ap_dev->lock); | |
1257 | ap_dev->unregistered = 0; | |
1258 | spin_unlock_bh(&ap_dev->lock); | |
1259 | } | |
1260 | else | |
1534c382 MS |
1261 | device_unregister(&ap_dev->device); |
1262 | } | |
1263 | } | |
1264 | ||
1265 | static void | |
1266 | ap_config_timeout(unsigned long ptr) | |
1267 | { | |
1268 | queue_work(ap_work_queue, &ap_config_work); | |
1269 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1270 | add_timer(&ap_config_timer); | |
1271 | } | |
1272 | ||
1273 | /** | |
1749a81d FB |
1274 | * ap_schedule_poll_timer(): Schedule poll timer. |
1275 | * | |
1534c382 MS |
1276 | * Set up the timer to run the poll tasklet |
1277 | */ | |
1278 | static inline void ap_schedule_poll_timer(void) | |
1279 | { | |
8d406c6d | 1280 | ktime_t hr_time; |
93521314 FB |
1281 | |
1282 | spin_lock_bh(&ap_poll_timer_lock); | |
772f5472 | 1283 | if (ap_using_interrupts() || ap_suspend_flag) |
93521314 | 1284 | goto out; |
fe137230 | 1285 | if (hrtimer_is_queued(&ap_poll_timer)) |
93521314 | 1286 | goto out; |
8d406c6d FB |
1287 | if (ktime_to_ns(hrtimer_expires_remaining(&ap_poll_timer)) <= 0) { |
1288 | hr_time = ktime_set(0, poll_timeout); | |
1289 | hrtimer_forward_now(&ap_poll_timer, hr_time); | |
1290 | hrtimer_restart(&ap_poll_timer); | |
1291 | } | |
93521314 FB |
1292 | out: |
1293 | spin_unlock_bh(&ap_poll_timer_lock); | |
1534c382 MS |
1294 | } |
1295 | ||
1296 | /** | |
1749a81d | 1297 | * ap_poll_read(): Receive pending reply messages from an AP device. |
1534c382 MS |
1298 | * @ap_dev: pointer to the AP device |
1299 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1300 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1301 | * |
1534c382 MS |
1302 | * Returns 0 if the device is still present, -ENODEV if not. |
1303 | */ | |
4d284cac | 1304 | static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1305 | { |
1306 | struct ap_queue_status status; | |
1307 | struct ap_message *ap_msg; | |
1308 | ||
1309 | if (ap_dev->queue_count <= 0) | |
1310 | return 0; | |
1311 | status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid, | |
1312 | ap_dev->reply->message, ap_dev->reply->length); | |
1313 | switch (status.response_code) { | |
1314 | case AP_RESPONSE_NORMAL: | |
1315 | atomic_dec(&ap_poll_requests); | |
af512ed0 | 1316 | ap_decrease_queue_count(ap_dev); |
1534c382 MS |
1317 | list_for_each_entry(ap_msg, &ap_dev->pendingq, list) { |
1318 | if (ap_msg->psmid != ap_dev->reply->psmid) | |
1319 | continue; | |
1320 | list_del_init(&ap_msg->list); | |
1321 | ap_dev->pendingq_count--; | |
1322 | ap_dev->drv->receive(ap_dev, ap_msg, ap_dev->reply); | |
1323 | break; | |
1324 | } | |
1325 | if (ap_dev->queue_count > 0) | |
1326 | *flags |= 1; | |
1327 | break; | |
1328 | case AP_RESPONSE_NO_PENDING_REPLY: | |
1329 | if (status.queue_empty) { | |
1330 | /* The card shouldn't forget requests but who knows. */ | |
e675c0d2 | 1331 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); |
1534c382 MS |
1332 | ap_dev->queue_count = 0; |
1333 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1334 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1335 | ap_dev->pendingq_count = 0; | |
1336 | } else | |
1337 | *flags |= 2; | |
1338 | break; | |
1339 | default: | |
1340 | return -ENODEV; | |
1341 | } | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | /** | |
1749a81d | 1346 | * ap_poll_write(): Send messages from the request queue to an AP device. |
1534c382 MS |
1347 | * @ap_dev: pointer to the AP device |
1348 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1349 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1350 | * |
1534c382 MS |
1351 | * Returns 0 if the device is still present, -ENODEV if not. |
1352 | */ | |
4d284cac | 1353 | static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1354 | { |
1355 | struct ap_queue_status status; | |
1356 | struct ap_message *ap_msg; | |
1357 | ||
1358 | if (ap_dev->requestq_count <= 0 || | |
1359 | ap_dev->queue_count >= ap_dev->queue_depth) | |
1360 | return 0; | |
1361 | /* Start the next request on the queue. */ | |
1362 | ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list); | |
1363 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
a6a5d73a | 1364 | ap_msg->message, ap_msg->length, ap_msg->special); |
1534c382 MS |
1365 | switch (status.response_code) { |
1366 | case AP_RESPONSE_NORMAL: | |
1367 | atomic_inc(&ap_poll_requests); | |
af512ed0 | 1368 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1369 | list_move_tail(&ap_msg->list, &ap_dev->pendingq); |
1370 | ap_dev->requestq_count--; | |
1371 | ap_dev->pendingq_count++; | |
1372 | if (ap_dev->queue_count < ap_dev->queue_depth && | |
1373 | ap_dev->requestq_count > 0) | |
1374 | *flags |= 1; | |
1375 | *flags |= 2; | |
1376 | break; | |
1377 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1378 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1379 | *flags |= 2; |
1380 | break; | |
1381 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
a6a5d73a | 1382 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
1534c382 MS |
1383 | return -EINVAL; |
1384 | default: | |
1385 | return -ENODEV; | |
1386 | } | |
1387 | return 0; | |
1388 | } | |
1389 | ||
1390 | /** | |
1749a81d | 1391 | * ap_poll_queue(): Poll AP device for pending replies and send new messages. |
1534c382 MS |
1392 | * @ap_dev: pointer to the bus device |
1393 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1394 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d FB |
1395 | * |
1396 | * Poll AP device for pending replies and send new messages. If either | |
1397 | * ap_poll_read or ap_poll_write returns -ENODEV unregister the device. | |
1534c382 MS |
1398 | * Returns 0. |
1399 | */ | |
1400 | static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags) | |
1401 | { | |
1402 | int rc; | |
1403 | ||
1404 | rc = ap_poll_read(ap_dev, flags); | |
1405 | if (rc) | |
1406 | return rc; | |
1407 | return ap_poll_write(ap_dev, flags); | |
1408 | } | |
1409 | ||
1410 | /** | |
1749a81d | 1411 | * __ap_queue_message(): Queue a message to a device. |
1534c382 MS |
1412 | * @ap_dev: pointer to the AP device |
1413 | * @ap_msg: the message to be queued | |
1749a81d FB |
1414 | * |
1415 | * Queue a message to a device. Returns 0 if successful. | |
1534c382 MS |
1416 | */ |
1417 | static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1418 | { | |
1419 | struct ap_queue_status status; | |
1420 | ||
1421 | if (list_empty(&ap_dev->requestq) && | |
1422 | ap_dev->queue_count < ap_dev->queue_depth) { | |
1423 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
a6a5d73a FB |
1424 | ap_msg->message, ap_msg->length, |
1425 | ap_msg->special); | |
1534c382 MS |
1426 | switch (status.response_code) { |
1427 | case AP_RESPONSE_NORMAL: | |
1428 | list_add_tail(&ap_msg->list, &ap_dev->pendingq); | |
1429 | atomic_inc(&ap_poll_requests); | |
1430 | ap_dev->pendingq_count++; | |
af512ed0 | 1431 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1432 | ap_dev->total_request_count++; |
1433 | break; | |
1434 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1435 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1436 | list_add_tail(&ap_msg->list, &ap_dev->requestq); |
1437 | ap_dev->requestq_count++; | |
1438 | ap_dev->total_request_count++; | |
1439 | return -EBUSY; | |
a6a5d73a | 1440 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
1534c382 MS |
1441 | case AP_RESPONSE_MESSAGE_TOO_BIG: |
1442 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL)); | |
1443 | return -EINVAL; | |
1444 | default: /* Device is gone. */ | |
1445 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
1446 | return -ENODEV; | |
1447 | } | |
1448 | } else { | |
1449 | list_add_tail(&ap_msg->list, &ap_dev->requestq); | |
1450 | ap_dev->requestq_count++; | |
1451 | ap_dev->total_request_count++; | |
1452 | return -EBUSY; | |
1453 | } | |
1454 | ap_schedule_poll_timer(); | |
1455 | return 0; | |
1456 | } | |
1457 | ||
1458 | void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1459 | { | |
1460 | unsigned long flags; | |
1461 | int rc; | |
1462 | ||
1463 | spin_lock_bh(&ap_dev->lock); | |
1464 | if (!ap_dev->unregistered) { | |
1465 | /* Make room on the queue by polling for finished requests. */ | |
1466 | rc = ap_poll_queue(ap_dev, &flags); | |
1467 | if (!rc) | |
1468 | rc = __ap_queue_message(ap_dev, ap_msg); | |
1469 | if (!rc) | |
1470 | wake_up(&ap_poll_wait); | |
4e56296d RW |
1471 | if (rc == -ENODEV) |
1472 | ap_dev->unregistered = 1; | |
1534c382 MS |
1473 | } else { |
1474 | ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); | |
c6a48264 | 1475 | rc = -ENODEV; |
1534c382 MS |
1476 | } |
1477 | spin_unlock_bh(&ap_dev->lock); | |
1478 | if (rc == -ENODEV) | |
1479 | device_unregister(&ap_dev->device); | |
1480 | } | |
1481 | EXPORT_SYMBOL(ap_queue_message); | |
1482 | ||
1483 | /** | |
1749a81d FB |
1484 | * ap_cancel_message(): Cancel a crypto request. |
1485 | * @ap_dev: The AP device that has the message queued | |
1486 | * @ap_msg: The message that is to be removed | |
1487 | * | |
1534c382 | 1488 | * Cancel a crypto request. This is done by removing the request |
1749a81d | 1489 | * from the device pending or request queue. Note that the |
1534c382 MS |
1490 | * request stays on the AP queue. When it finishes the message |
1491 | * reply will be discarded because the psmid can't be found. | |
1534c382 MS |
1492 | */ |
1493 | void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1494 | { | |
1495 | struct ap_message *tmp; | |
1496 | ||
1497 | spin_lock_bh(&ap_dev->lock); | |
1498 | if (!list_empty(&ap_msg->list)) { | |
1499 | list_for_each_entry(tmp, &ap_dev->pendingq, list) | |
1500 | if (tmp->psmid == ap_msg->psmid) { | |
1501 | ap_dev->pendingq_count--; | |
1502 | goto found; | |
1503 | } | |
1504 | ap_dev->requestq_count--; | |
1505 | found: | |
1506 | list_del_init(&ap_msg->list); | |
1507 | } | |
1508 | spin_unlock_bh(&ap_dev->lock); | |
1509 | } | |
1510 | EXPORT_SYMBOL(ap_cancel_message); | |
1511 | ||
1512 | /** | |
1749a81d | 1513 | * ap_poll_timeout(): AP receive polling for finished AP requests. |
fe137230 | 1514 | * @unused: Unused pointer. |
1749a81d | 1515 | * |
fe137230 | 1516 | * Schedules the AP tasklet using a high resolution timer. |
1534c382 | 1517 | */ |
fe137230 | 1518 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) |
1534c382 MS |
1519 | { |
1520 | tasklet_schedule(&ap_tasklet); | |
fe137230 | 1521 | return HRTIMER_NORESTART; |
1534c382 MS |
1522 | } |
1523 | ||
af512ed0 | 1524 | /** |
1749a81d FB |
1525 | * ap_reset(): Reset a not responding AP device. |
1526 | * @ap_dev: Pointer to the AP device | |
1527 | * | |
af512ed0 RW |
1528 | * Reset a not responding AP device and move all requests from the |
1529 | * pending queue to the request queue. | |
1530 | */ | |
1531 | static void ap_reset(struct ap_device *ap_dev) | |
1532 | { | |
1533 | int rc; | |
1534 | ||
1535 | ap_dev->reset = AP_RESET_IGNORE; | |
1536 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
1537 | ap_dev->queue_count = 0; | |
1538 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1539 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1540 | ap_dev->pendingq_count = 0; | |
1541 | rc = ap_init_queue(ap_dev->qid); | |
1542 | if (rc == -ENODEV) | |
1543 | ap_dev->unregistered = 1; | |
1544 | } | |
1545 | ||
43c207e6 | 1546 | static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 | 1547 | { |
1534c382 | 1548 | if (!ap_dev->unregistered) { |
c6a48264 | 1549 | if (ap_poll_queue(ap_dev, flags)) |
4e56296d | 1550 | ap_dev->unregistered = 1; |
af512ed0 RW |
1551 | if (ap_dev->reset == AP_RESET_DO) |
1552 | ap_reset(ap_dev); | |
c6a48264 | 1553 | } |
1534c382 MS |
1554 | return 0; |
1555 | } | |
1556 | ||
1749a81d FB |
1557 | /** |
1558 | * ap_poll_all(): Poll all AP devices. | |
1559 | * @dummy: Unused variable | |
1560 | * | |
1561 | * Poll all AP devices on the bus in a round robin fashion. Continue | |
1562 | * polling until bit 2^0 of the control flags is not set. If bit 2^1 | |
1563 | * of the control flags has been set arm the poll timer. | |
1564 | */ | |
1534c382 MS |
1565 | static void ap_poll_all(unsigned long dummy) |
1566 | { | |
1567 | unsigned long flags; | |
cf352ce0 | 1568 | struct ap_device *ap_dev; |
1534c382 | 1569 | |
cb17a636 FB |
1570 | /* Reset the indicator if interrupts are used. Thus new interrupts can |
1571 | * be received. Doing it in the beginning of the tasklet is therefor | |
1572 | * important that no requests on any AP get lost. | |
1573 | */ | |
1574 | if (ap_using_interrupts()) | |
1575 | xchg((u8 *)ap_interrupt_indicator, 0); | |
1534c382 MS |
1576 | do { |
1577 | flags = 0; | |
43c207e6 | 1578 | spin_lock(&ap_device_list_lock); |
cf352ce0 | 1579 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
95f1556c | 1580 | spin_lock(&ap_dev->lock); |
43c207e6 | 1581 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 1582 | spin_unlock(&ap_dev->lock); |
cf352ce0 | 1583 | } |
43c207e6 | 1584 | spin_unlock(&ap_device_list_lock); |
1534c382 MS |
1585 | } while (flags & 1); |
1586 | if (flags & 2) | |
1587 | ap_schedule_poll_timer(); | |
1588 | } | |
1589 | ||
1590 | /** | |
1749a81d FB |
1591 | * ap_poll_thread(): Thread that polls for finished requests. |
1592 | * @data: Unused pointer | |
1593 | * | |
1534c382 MS |
1594 | * AP bus poll thread. The purpose of this thread is to poll for |
1595 | * finished requests in a loop if there is a "free" cpu - that is | |
1596 | * a cpu that doesn't have anything better to do. The polling stops | |
1597 | * as soon as there is another task or if all messages have been | |
1598 | * delivered. | |
1599 | */ | |
1600 | static int ap_poll_thread(void *data) | |
1601 | { | |
1602 | DECLARE_WAITQUEUE(wait, current); | |
1603 | unsigned long flags; | |
1604 | int requests; | |
cf352ce0 | 1605 | struct ap_device *ap_dev; |
1534c382 | 1606 | |
d83682b3 | 1607 | set_user_nice(current, 19); |
1534c382 | 1608 | while (1) { |
772f5472 FB |
1609 | if (ap_suspend_flag) |
1610 | return 0; | |
1534c382 MS |
1611 | if (need_resched()) { |
1612 | schedule(); | |
1613 | continue; | |
1614 | } | |
1615 | add_wait_queue(&ap_poll_wait, &wait); | |
1616 | set_current_state(TASK_INTERRUPTIBLE); | |
1617 | if (kthread_should_stop()) | |
1618 | break; | |
1619 | requests = atomic_read(&ap_poll_requests); | |
1620 | if (requests <= 0) | |
1621 | schedule(); | |
1622 | set_current_state(TASK_RUNNING); | |
1623 | remove_wait_queue(&ap_poll_wait, &wait); | |
1624 | ||
1534c382 | 1625 | flags = 0; |
43c207e6 | 1626 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 1627 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
95f1556c | 1628 | spin_lock(&ap_dev->lock); |
43c207e6 | 1629 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 1630 | spin_unlock(&ap_dev->lock); |
cf352ce0 | 1631 | } |
43c207e6 | 1632 | spin_unlock_bh(&ap_device_list_lock); |
1534c382 MS |
1633 | } |
1634 | set_current_state(TASK_RUNNING); | |
1635 | remove_wait_queue(&ap_poll_wait, &wait); | |
1636 | return 0; | |
1637 | } | |
1638 | ||
1639 | static int ap_poll_thread_start(void) | |
1640 | { | |
1641 | int rc; | |
1642 | ||
772f5472 | 1643 | if (ap_using_interrupts() || ap_suspend_flag) |
cb17a636 | 1644 | return 0; |
1534c382 MS |
1645 | mutex_lock(&ap_poll_thread_mutex); |
1646 | if (!ap_poll_kthread) { | |
1647 | ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); | |
1648 | rc = IS_ERR(ap_poll_kthread) ? PTR_ERR(ap_poll_kthread) : 0; | |
1649 | if (rc) | |
1650 | ap_poll_kthread = NULL; | |
1651 | } | |
1652 | else | |
1653 | rc = 0; | |
1654 | mutex_unlock(&ap_poll_thread_mutex); | |
1655 | return rc; | |
1656 | } | |
1657 | ||
1658 | static void ap_poll_thread_stop(void) | |
1659 | { | |
1660 | mutex_lock(&ap_poll_thread_mutex); | |
1661 | if (ap_poll_kthread) { | |
1662 | kthread_stop(ap_poll_kthread); | |
1663 | ap_poll_kthread = NULL; | |
1664 | } | |
1665 | mutex_unlock(&ap_poll_thread_mutex); | |
1666 | } | |
1667 | ||
af512ed0 | 1668 | /** |
1749a81d FB |
1669 | * ap_request_timeout(): Handling of request timeouts |
1670 | * @data: Holds the AP device. | |
1671 | * | |
1672 | * Handles request timeouts. | |
af512ed0 RW |
1673 | */ |
1674 | static void ap_request_timeout(unsigned long data) | |
1675 | { | |
1676 | struct ap_device *ap_dev = (struct ap_device *) data; | |
1677 | ||
cb17a636 | 1678 | if (ap_dev->reset == AP_RESET_ARMED) { |
af512ed0 | 1679 | ap_dev->reset = AP_RESET_DO; |
cb17a636 FB |
1680 | |
1681 | if (ap_using_interrupts()) | |
1682 | tasklet_schedule(&ap_tasklet); | |
1683 | } | |
af512ed0 RW |
1684 | } |
1685 | ||
13e742ba RW |
1686 | static void ap_reset_domain(void) |
1687 | { | |
1688 | int i; | |
1689 | ||
39aa7cf6 RW |
1690 | if (ap_domain_index != -1) |
1691 | for (i = 0; i < AP_DEVICES; i++) | |
1692 | ap_reset_queue(AP_MKQID(i, ap_domain_index)); | |
13e742ba RW |
1693 | } |
1694 | ||
1695 | static void ap_reset_all(void) | |
85eca850 RW |
1696 | { |
1697 | int i, j; | |
1698 | ||
1699 | for (i = 0; i < AP_DOMAINS; i++) | |
1700 | for (j = 0; j < AP_DEVICES; j++) | |
1701 | ap_reset_queue(AP_MKQID(j, i)); | |
1702 | } | |
1703 | ||
1704 | static struct reset_call ap_reset_call = { | |
13e742ba | 1705 | .fn = ap_reset_all, |
85eca850 RW |
1706 | }; |
1707 | ||
1534c382 | 1708 | /** |
1749a81d FB |
1709 | * ap_module_init(): The module initialization code. |
1710 | * | |
1711 | * Initializes the module. | |
1534c382 MS |
1712 | */ |
1713 | int __init ap_module_init(void) | |
1714 | { | |
1715 | int rc, i; | |
1716 | ||
1717 | if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) { | |
136f7a1c MS |
1718 | pr_warning("%d is not a valid cryptographic domain\n", |
1719 | ap_domain_index); | |
1534c382 MS |
1720 | return -EINVAL; |
1721 | } | |
5314af69 FB |
1722 | /* In resume callback we need to know if the user had set the domain. |
1723 | * If so, we can not just reset it. | |
1724 | */ | |
1725 | if (ap_domain_index >= 0) | |
1726 | user_set_domain = 1; | |
1727 | ||
1534c382 | 1728 | if (ap_instructions_available() != 0) { |
136f7a1c MS |
1729 | pr_warning("The hardware system does not support " |
1730 | "AP instructions\n"); | |
1534c382 MS |
1731 | return -ENODEV; |
1732 | } | |
cb17a636 FB |
1733 | if (ap_interrupts_available()) { |
1734 | isc_register(AP_ISC); | |
1735 | ap_interrupt_indicator = s390_register_adapter_interrupt( | |
1736 | &ap_interrupt_handler, NULL, AP_ISC); | |
1737 | if (IS_ERR(ap_interrupt_indicator)) { | |
1738 | ap_interrupt_indicator = NULL; | |
1739 | isc_unregister(AP_ISC); | |
1740 | } | |
1741 | } | |
1742 | ||
85eca850 | 1743 | register_reset_call(&ap_reset_call); |
1534c382 MS |
1744 | |
1745 | /* Create /sys/bus/ap. */ | |
1746 | rc = bus_register(&ap_bus_type); | |
1747 | if (rc) | |
1748 | goto out; | |
1749 | for (i = 0; ap_bus_attrs[i]; i++) { | |
1750 | rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); | |
1751 | if (rc) | |
1752 | goto out_bus; | |
1753 | } | |
1754 | ||
1755 | /* Create /sys/devices/ap. */ | |
035da16f | 1756 | ap_root_device = root_device_register("ap"); |
1534c382 MS |
1757 | rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0; |
1758 | if (rc) | |
1759 | goto out_bus; | |
1760 | ||
1761 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
1762 | if (!ap_work_queue) { | |
1763 | rc = -ENOMEM; | |
1764 | goto out_root; | |
1765 | } | |
1766 | ||
1767 | if (ap_select_domain() == 0) | |
1768 | ap_scan_bus(NULL); | |
1769 | ||
1749a81d | 1770 | /* Setup the AP bus rescan timer. */ |
1534c382 MS |
1771 | init_timer(&ap_config_timer); |
1772 | ap_config_timer.function = ap_config_timeout; | |
1773 | ap_config_timer.data = 0; | |
1774 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1775 | add_timer(&ap_config_timer); | |
1776 | ||
fe137230 FB |
1777 | /* Setup the high resultion poll timer. |
1778 | * If we are running under z/VM adjust polling to z/VM polling rate. | |
1779 | */ | |
1780 | if (MACHINE_IS_VM) | |
1781 | poll_timeout = 1500000; | |
93521314 | 1782 | spin_lock_init(&ap_poll_timer_lock); |
fe137230 FB |
1783 | hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
1784 | ap_poll_timer.function = ap_poll_timeout; | |
1785 | ||
1534c382 MS |
1786 | /* Start the low priority AP bus poll thread. */ |
1787 | if (ap_thread_flag) { | |
1788 | rc = ap_poll_thread_start(); | |
1789 | if (rc) | |
1790 | goto out_work; | |
1791 | } | |
1792 | ||
1793 | return 0; | |
1794 | ||
1795 | out_work: | |
1796 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1797 | hrtimer_cancel(&ap_poll_timer); |
1534c382 MS |
1798 | destroy_workqueue(ap_work_queue); |
1799 | out_root: | |
035da16f | 1800 | root_device_unregister(ap_root_device); |
1534c382 MS |
1801 | out_bus: |
1802 | while (i--) | |
1803 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1804 | bus_unregister(&ap_bus_type); | |
1805 | out: | |
85eca850 | 1806 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1807 | if (ap_using_interrupts()) { |
1808 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1809 | isc_unregister(AP_ISC); | |
1810 | } | |
1534c382 MS |
1811 | return rc; |
1812 | } | |
1813 | ||
1814 | static int __ap_match_all(struct device *dev, void *data) | |
1815 | { | |
1816 | return 1; | |
1817 | } | |
1818 | ||
1819 | /** | |
1749a81d FB |
1820 | * ap_modules_exit(): The module termination code |
1821 | * | |
1822 | * Terminates the module. | |
1534c382 MS |
1823 | */ |
1824 | void ap_module_exit(void) | |
1825 | { | |
1826 | int i; | |
1827 | struct device *dev; | |
1828 | ||
13e742ba | 1829 | ap_reset_domain(); |
1534c382 MS |
1830 | ap_poll_thread_stop(); |
1831 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1832 | hrtimer_cancel(&ap_poll_timer); |
1534c382 | 1833 | destroy_workqueue(ap_work_queue); |
13e742ba | 1834 | tasklet_kill(&ap_tasklet); |
035da16f | 1835 | root_device_unregister(ap_root_device); |
1534c382 MS |
1836 | while ((dev = bus_find_device(&ap_bus_type, NULL, NULL, |
1837 | __ap_match_all))) | |
1838 | { | |
1839 | device_unregister(dev); | |
1840 | put_device(dev); | |
1841 | } | |
1842 | for (i = 0; ap_bus_attrs[i]; i++) | |
1843 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1844 | bus_unregister(&ap_bus_type); | |
85eca850 | 1845 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1846 | if (ap_using_interrupts()) { |
1847 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1848 | isc_unregister(AP_ISC); | |
1849 | } | |
1534c382 MS |
1850 | } |
1851 | ||
1852 | #ifndef CONFIG_ZCRYPT_MONOLITHIC | |
1853 | module_init(ap_module_init); | |
1854 | module_exit(ap_module_exit); | |
1855 | #endif |