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1534c382 | 1 | /* |
a53c8fab | 2 | * Copyright IBM Corp. 2006 |
1534c382 MS |
3 | * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> |
4 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
5 | * Ralph Wuerthner <rwuerthn@de.ibm.com> | |
cb17a636 | 6 | * Felix Beck <felix.beck@de.ibm.com> |
6bed05bc | 7 | * Holger Dengler <hd@linux.vnet.ibm.com> |
1534c382 MS |
8 | * |
9 | * Adjunct processor bus. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | */ | |
25 | ||
136f7a1c MS |
26 | #define KMSG_COMPONENT "ap" |
27 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
28 | ||
62d146ff | 29 | #include <linux/kernel_stat.h> |
1534c382 MS |
30 | #include <linux/module.h> |
31 | #include <linux/init.h> | |
32 | #include <linux/delay.h> | |
33 | #include <linux/err.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/workqueue.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1534c382 MS |
37 | #include <linux/notifier.h> |
38 | #include <linux/kthread.h> | |
39 | #include <linux/mutex.h> | |
85eca850 | 40 | #include <asm/reset.h> |
cb17a636 | 41 | #include <asm/airq.h> |
60063497 | 42 | #include <linux/atomic.h> |
cb17a636 | 43 | #include <asm/isc.h> |
fe137230 FB |
44 | #include <linux/hrtimer.h> |
45 | #include <linux/ktime.h> | |
a0616cde | 46 | #include <asm/facility.h> |
1534c382 MS |
47 | |
48 | #include "ap_bus.h" | |
49 | ||
50 | /* Some prototypes. */ | |
4927b3f7 | 51 | static void ap_scan_bus(struct work_struct *); |
1534c382 | 52 | static void ap_poll_all(unsigned long); |
fe137230 | 53 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *); |
1534c382 MS |
54 | static int ap_poll_thread_start(void); |
55 | static void ap_poll_thread_stop(void); | |
af512ed0 | 56 | static void ap_request_timeout(unsigned long); |
cb17a636 | 57 | static inline void ap_schedule_poll_timer(void); |
772f5472 FB |
58 | static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags); |
59 | static int ap_device_remove(struct device *dev); | |
60 | static int ap_device_probe(struct device *dev); | |
61 | static void ap_interrupt_handler(void *unused1, void *unused2); | |
62 | static void ap_reset(struct ap_device *ap_dev); | |
63 | static void ap_config_timeout(unsigned long ptr); | |
5314af69 | 64 | static int ap_select_domain(void); |
1534c382 | 65 | |
1749a81d | 66 | /* |
1534c382 MS |
67 | * Module description. |
68 | */ | |
69 | MODULE_AUTHOR("IBM Corporation"); | |
70 | MODULE_DESCRIPTION("Adjunct Processor Bus driver, " | |
a53c8fab | 71 | "Copyright IBM Corp. 2006"); |
1534c382 MS |
72 | MODULE_LICENSE("GPL"); |
73 | ||
1749a81d | 74 | /* |
1534c382 MS |
75 | * Module parameter |
76 | */ | |
77 | int ap_domain_index = -1; /* Adjunct Processor Domain Index */ | |
78 | module_param_named(domain, ap_domain_index, int, 0000); | |
79 | MODULE_PARM_DESC(domain, "domain index for ap devices"); | |
80 | EXPORT_SYMBOL(ap_domain_index); | |
81 | ||
b90b34c6 | 82 | static int ap_thread_flag = 0; |
1534c382 | 83 | module_param_named(poll_thread, ap_thread_flag, int, 0000); |
b90b34c6 | 84 | MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); |
1534c382 MS |
85 | |
86 | static struct device *ap_root_device = NULL; | |
43c207e6 | 87 | static DEFINE_SPINLOCK(ap_device_list_lock); |
cf352ce0 | 88 | static LIST_HEAD(ap_device_list); |
1534c382 | 89 | |
1749a81d | 90 | /* |
1534c382 MS |
91 | * Workqueue & timer for bus rescan. |
92 | */ | |
93 | static struct workqueue_struct *ap_work_queue; | |
94 | static struct timer_list ap_config_timer; | |
95 | static int ap_config_time = AP_CONFIG_TIME; | |
4927b3f7 | 96 | static DECLARE_WORK(ap_config_work, ap_scan_bus); |
1534c382 | 97 | |
1749a81d | 98 | /* |
cb17a636 | 99 | * Tasklet & timer for AP request polling and interrupts |
1534c382 | 100 | */ |
1534c382 MS |
101 | static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0); |
102 | static atomic_t ap_poll_requests = ATOMIC_INIT(0); | |
103 | static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); | |
104 | static struct task_struct *ap_poll_kthread = NULL; | |
105 | static DEFINE_MUTEX(ap_poll_thread_mutex); | |
93521314 | 106 | static DEFINE_SPINLOCK(ap_poll_timer_lock); |
cb17a636 | 107 | static void *ap_interrupt_indicator; |
fe137230 FB |
108 | static struct hrtimer ap_poll_timer; |
109 | /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. | |
110 | * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ | |
111 | static unsigned long long poll_timeout = 250000; | |
1534c382 | 112 | |
772f5472 FB |
113 | /* Suspend flag */ |
114 | static int ap_suspend_flag; | |
5314af69 FB |
115 | /* Flag to check if domain was set through module parameter domain=. This is |
116 | * important when supsend and resume is done in a z/VM environment where the | |
117 | * domain might change. */ | |
118 | static int user_set_domain = 0; | |
772f5472 FB |
119 | static struct bus_type ap_bus_type; |
120 | ||
cb17a636 FB |
121 | /** |
122 | * ap_using_interrupts() - Returns non-zero if interrupt support is | |
123 | * available. | |
124 | */ | |
125 | static inline int ap_using_interrupts(void) | |
126 | { | |
127 | return ap_interrupt_indicator != NULL; | |
128 | } | |
129 | ||
1534c382 | 130 | /** |
1749a81d | 131 | * ap_intructions_available() - Test if AP instructions are available. |
1534c382 | 132 | * |
1749a81d | 133 | * Returns 0 if the AP instructions are installed. |
1534c382 MS |
134 | */ |
135 | static inline int ap_instructions_available(void) | |
136 | { | |
137 | register unsigned long reg0 asm ("0") = AP_MKQID(0,0); | |
138 | register unsigned long reg1 asm ("1") = -ENODEV; | |
139 | register unsigned long reg2 asm ("2") = 0UL; | |
140 | ||
141 | asm volatile( | |
142 | " .long 0xb2af0000\n" /* PQAP(TAPQ) */ | |
143 | "0: la %1,0\n" | |
144 | "1:\n" | |
145 | EX_TABLE(0b, 1b) | |
146 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" ); | |
147 | return reg1; | |
148 | } | |
149 | ||
cb17a636 FB |
150 | /** |
151 | * ap_interrupts_available(): Test if AP interrupts are available. | |
152 | * | |
153 | * Returns 1 if AP interrupts are available. | |
154 | */ | |
155 | static int ap_interrupts_available(void) | |
156 | { | |
53ec24b1 | 157 | return test_facility(2) && test_facility(65); |
cb17a636 FB |
158 | } |
159 | ||
1534c382 | 160 | /** |
1749a81d FB |
161 | * ap_test_queue(): Test adjunct processor queue. |
162 | * @qid: The AP queue number | |
163 | * @queue_depth: Pointer to queue depth value | |
164 | * @device_type: Pointer to device type value | |
1534c382 | 165 | * |
1749a81d | 166 | * Returns AP queue status structure. |
1534c382 MS |
167 | */ |
168 | static inline struct ap_queue_status | |
169 | ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
170 | { | |
171 | register unsigned long reg0 asm ("0") = qid; | |
172 | register struct ap_queue_status reg1 asm ("1"); | |
173 | register unsigned long reg2 asm ("2") = 0UL; | |
174 | ||
175 | asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */ | |
176 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
177 | *device_type = (int) (reg2 >> 24); | |
178 | *queue_depth = (int) (reg2 & 0xff); | |
179 | return reg1; | |
180 | } | |
181 | ||
182 | /** | |
1749a81d FB |
183 | * ap_reset_queue(): Reset adjunct processor queue. |
184 | * @qid: The AP queue number | |
1534c382 | 185 | * |
1749a81d | 186 | * Returns AP queue status structure. |
1534c382 MS |
187 | */ |
188 | static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) | |
189 | { | |
190 | register unsigned long reg0 asm ("0") = qid | 0x01000000UL; | |
191 | register struct ap_queue_status reg1 asm ("1"); | |
192 | register unsigned long reg2 asm ("2") = 0UL; | |
193 | ||
194 | asm volatile( | |
195 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
196 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
197 | return reg1; | |
198 | } | |
199 | ||
cb17a636 FB |
200 | #ifdef CONFIG_64BIT |
201 | /** | |
202 | * ap_queue_interruption_control(): Enable interruption for a specific AP. | |
203 | * @qid: The AP queue number | |
204 | * @ind: The notification indicator byte | |
205 | * | |
206 | * Returns AP queue status. | |
207 | */ | |
208 | static inline struct ap_queue_status | |
209 | ap_queue_interruption_control(ap_qid_t qid, void *ind) | |
210 | { | |
211 | register unsigned long reg0 asm ("0") = qid | 0x03000000UL; | |
212 | register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC; | |
213 | register struct ap_queue_status reg1_out asm ("1"); | |
214 | register void *reg2 asm ("2") = ind; | |
215 | asm volatile( | |
a7475afd | 216 | ".long 0xb2af0000" /* PQAP(AQIC) */ |
cb17a636 FB |
217 | : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) |
218 | : | |
219 | : "cc" ); | |
220 | return reg1_out; | |
221 | } | |
222 | #endif | |
223 | ||
6bed05bc HD |
224 | #ifdef CONFIG_64BIT |
225 | static inline struct ap_queue_status | |
226 | __ap_query_functions(ap_qid_t qid, unsigned int *functions) | |
b1f933da FB |
227 | { |
228 | register unsigned long reg0 asm ("0") = 0UL | qid | (1UL << 23); | |
6bed05bc HD |
229 | register struct ap_queue_status reg1 asm ("1") = AP_QUEUE_STATUS_INVALID; |
230 | register unsigned long reg2 asm ("2"); | |
b1f933da FB |
231 | |
232 | asm volatile( | |
a7475afd | 233 | ".long 0xb2af0000\n" /* PQAP(TAPQ) */ |
6bed05bc HD |
234 | "0:\n" |
235 | EX_TABLE(0b, 0b) | |
236 | : "+d" (reg0), "+d" (reg1), "=d" (reg2) | |
b1f933da FB |
237 | : |
238 | : "cc"); | |
239 | ||
6bed05bc | 240 | *functions = (unsigned int)(reg2 >> 32); |
b1f933da FB |
241 | return reg1; |
242 | } | |
6bed05bc | 243 | #endif |
b1f933da FB |
244 | |
245 | /** | |
6bed05bc | 246 | * ap_query_functions(): Query supported functions. |
b1f933da | 247 | * @qid: The AP queue number |
6bed05bc | 248 | * @functions: Pointer to functions field. |
b1f933da | 249 | * |
6bed05bc HD |
250 | * Returns |
251 | * 0 on success. | |
252 | * -ENODEV if queue not valid. | |
253 | * -EBUSY if device busy. | |
254 | * -EINVAL if query function is not supported | |
b1f933da | 255 | */ |
6bed05bc | 256 | static int ap_query_functions(ap_qid_t qid, unsigned int *functions) |
b1f933da | 257 | { |
6bed05bc | 258 | #ifdef CONFIG_64BIT |
b1f933da | 259 | struct ap_queue_status status; |
6bed05bc HD |
260 | int i; |
261 | status = __ap_query_functions(qid, functions); | |
b1f933da FB |
262 | |
263 | for (i = 0; i < AP_MAX_RESET; i++) { | |
6bed05bc HD |
264 | if (ap_queue_status_invalid_test(&status)) |
265 | return -ENODEV; | |
266 | ||
b1f933da FB |
267 | switch (status.response_code) { |
268 | case AP_RESPONSE_NORMAL: | |
6bed05bc | 269 | return 0; |
b1f933da FB |
270 | case AP_RESPONSE_RESET_IN_PROGRESS: |
271 | case AP_RESPONSE_BUSY: | |
272 | break; | |
273 | case AP_RESPONSE_Q_NOT_AVAIL: | |
274 | case AP_RESPONSE_DECONFIGURED: | |
275 | case AP_RESPONSE_CHECKSTOPPED: | |
276 | case AP_RESPONSE_INVALID_ADDRESS: | |
6bed05bc | 277 | return -ENODEV; |
b1f933da FB |
278 | case AP_RESPONSE_OTHERWISE_CHANGED: |
279 | break; | |
280 | default: | |
281 | break; | |
282 | } | |
283 | if (i < AP_MAX_RESET - 1) { | |
284 | udelay(5); | |
6bed05bc | 285 | status = __ap_query_functions(qid, functions); |
b1f933da FB |
286 | } |
287 | } | |
6bed05bc HD |
288 | return -EBUSY; |
289 | #else | |
290 | return -EINVAL; | |
291 | #endif | |
292 | } | |
293 | ||
294 | /** | |
295 | * ap_4096_commands_availablen(): Check for availability of 4096 bit RSA | |
296 | * support. | |
297 | * @qid: The AP queue number | |
298 | * | |
299 | * Returns 1 if 4096 bit RSA keys are support fo the AP, returns 0 if not. | |
300 | */ | |
301 | int ap_4096_commands_available(ap_qid_t qid) | |
302 | { | |
303 | unsigned int functions; | |
304 | ||
305 | if (ap_query_functions(qid, &functions)) | |
306 | return 0; | |
307 | ||
308 | return test_ap_facility(functions, 1) && | |
309 | test_ap_facility(functions, 2); | |
b1f933da FB |
310 | } |
311 | EXPORT_SYMBOL(ap_4096_commands_available); | |
312 | ||
cb17a636 FB |
313 | /** |
314 | * ap_queue_enable_interruption(): Enable interruption on an AP. | |
315 | * @qid: The AP queue number | |
316 | * @ind: the notification indicator byte | |
317 | * | |
318 | * Enables interruption on AP queue via ap_queue_interruption_control(). Based | |
319 | * on the return value it waits a while and tests the AP queue if interrupts | |
320 | * have been switched on using ap_test_queue(). | |
321 | */ | |
322 | static int ap_queue_enable_interruption(ap_qid_t qid, void *ind) | |
323 | { | |
324 | #ifdef CONFIG_64BIT | |
325 | struct ap_queue_status status; | |
326 | int t_depth, t_device_type, rc, i; | |
327 | ||
328 | rc = -EBUSY; | |
329 | status = ap_queue_interruption_control(qid, ind); | |
330 | ||
331 | for (i = 0; i < AP_MAX_RESET; i++) { | |
332 | switch (status.response_code) { | |
333 | case AP_RESPONSE_NORMAL: | |
334 | if (status.int_enabled) | |
335 | return 0; | |
336 | break; | |
337 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
338 | case AP_RESPONSE_BUSY: | |
8738e07d HD |
339 | if (i < AP_MAX_RESET - 1) { |
340 | udelay(5); | |
341 | status = ap_queue_interruption_control(qid, | |
342 | ind); | |
343 | continue; | |
344 | } | |
cb17a636 FB |
345 | break; |
346 | case AP_RESPONSE_Q_NOT_AVAIL: | |
347 | case AP_RESPONSE_DECONFIGURED: | |
348 | case AP_RESPONSE_CHECKSTOPPED: | |
349 | case AP_RESPONSE_INVALID_ADDRESS: | |
350 | return -ENODEV; | |
351 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
352 | if (status.int_enabled) | |
353 | return 0; | |
354 | break; | |
355 | default: | |
356 | break; | |
357 | } | |
358 | if (i < AP_MAX_RESET - 1) { | |
359 | udelay(5); | |
360 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
361 | } | |
362 | } | |
363 | return rc; | |
364 | #else | |
365 | return -EINVAL; | |
366 | #endif | |
367 | } | |
368 | ||
1534c382 | 369 | /** |
1749a81d FB |
370 | * __ap_send(): Send message to adjunct processor queue. |
371 | * @qid: The AP queue number | |
372 | * @psmid: The program supplied message identifier | |
373 | * @msg: The message text | |
374 | * @length: The message length | |
a6a5d73a | 375 | * @special: Special Bit |
1534c382 | 376 | * |
1749a81d | 377 | * Returns AP queue status structure. |
1534c382 | 378 | * Condition code 1 on NQAP can't happen because the L bit is 1. |
1534c382 MS |
379 | * Condition code 2 on NQAP also means the send is incomplete, |
380 | * because a segment boundary was reached. The NQAP is repeated. | |
381 | */ | |
382 | static inline struct ap_queue_status | |
a6a5d73a FB |
383 | __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length, |
384 | unsigned int special) | |
1534c382 MS |
385 | { |
386 | typedef struct { char _[length]; } msgblock; | |
387 | register unsigned long reg0 asm ("0") = qid | 0x40000000UL; | |
388 | register struct ap_queue_status reg1 asm ("1"); | |
389 | register unsigned long reg2 asm ("2") = (unsigned long) msg; | |
390 | register unsigned long reg3 asm ("3") = (unsigned long) length; | |
391 | register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32); | |
392 | register unsigned long reg5 asm ("5") = (unsigned int) psmid; | |
393 | ||
a6a5d73a FB |
394 | if (special == 1) |
395 | reg0 |= 0x400000UL; | |
396 | ||
1534c382 | 397 | asm volatile ( |
a7475afd | 398 | "0: .long 0xb2ad0042\n" /* NQAP */ |
1534c382 MS |
399 | " brc 2,0b" |
400 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) | |
401 | : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) | |
402 | : "cc" ); | |
403 | return reg1; | |
404 | } | |
405 | ||
406 | int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
407 | { | |
408 | struct ap_queue_status status; | |
409 | ||
a6a5d73a | 410 | status = __ap_send(qid, psmid, msg, length, 0); |
1534c382 MS |
411 | switch (status.response_code) { |
412 | case AP_RESPONSE_NORMAL: | |
413 | return 0; | |
414 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 415 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 | 416 | return -EBUSY; |
a6a5d73a FB |
417 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
418 | return -EINVAL; | |
1534c382 MS |
419 | default: /* Device is gone. */ |
420 | return -ENODEV; | |
421 | } | |
422 | } | |
423 | EXPORT_SYMBOL(ap_send); | |
424 | ||
1749a81d FB |
425 | /** |
426 | * __ap_recv(): Receive message from adjunct processor queue. | |
427 | * @qid: The AP queue number | |
428 | * @psmid: Pointer to program supplied message identifier | |
429 | * @msg: The message text | |
430 | * @length: The message length | |
1534c382 | 431 | * |
1749a81d | 432 | * Returns AP queue status structure. |
1534c382 MS |
433 | * Condition code 1 on DQAP means the receive has taken place |
434 | * but only partially. The response is incomplete, hence the | |
435 | * DQAP is repeated. | |
1534c382 MS |
436 | * Condition code 2 on DQAP also means the receive is incomplete, |
437 | * this time because a segment boundary was reached. Again, the | |
438 | * DQAP is repeated. | |
1534c382 MS |
439 | * Note that gpr2 is used by the DQAP instruction to keep track of |
440 | * any 'residual' length, in case the instruction gets interrupted. | |
441 | * Hence it gets zeroed before the instruction. | |
442 | */ | |
443 | static inline struct ap_queue_status | |
444 | __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
445 | { | |
446 | typedef struct { char _[length]; } msgblock; | |
447 | register unsigned long reg0 asm("0") = qid | 0x80000000UL; | |
448 | register struct ap_queue_status reg1 asm ("1"); | |
449 | register unsigned long reg2 asm("2") = 0UL; | |
450 | register unsigned long reg4 asm("4") = (unsigned long) msg; | |
451 | register unsigned long reg5 asm("5") = (unsigned long) length; | |
452 | register unsigned long reg6 asm("6") = 0UL; | |
453 | register unsigned long reg7 asm("7") = 0UL; | |
454 | ||
455 | ||
456 | asm volatile( | |
a7475afd | 457 | "0: .long 0xb2ae0064\n" /* DQAP */ |
1534c382 MS |
458 | " brc 6,0b\n" |
459 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), | |
460 | "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), | |
461 | "=m" (*(msgblock *) msg) : : "cc" ); | |
462 | *psmid = (((unsigned long long) reg6) << 32) + reg7; | |
463 | return reg1; | |
464 | } | |
465 | ||
466 | int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
467 | { | |
468 | struct ap_queue_status status; | |
469 | ||
470 | status = __ap_recv(qid, psmid, msg, length); | |
471 | switch (status.response_code) { | |
472 | case AP_RESPONSE_NORMAL: | |
473 | return 0; | |
474 | case AP_RESPONSE_NO_PENDING_REPLY: | |
475 | if (status.queue_empty) | |
476 | return -ENOENT; | |
477 | return -EBUSY; | |
af512ed0 RW |
478 | case AP_RESPONSE_RESET_IN_PROGRESS: |
479 | return -EBUSY; | |
1534c382 MS |
480 | default: |
481 | return -ENODEV; | |
482 | } | |
483 | } | |
484 | EXPORT_SYMBOL(ap_recv); | |
485 | ||
486 | /** | |
1749a81d FB |
487 | * ap_query_queue(): Check if an AP queue is available. |
488 | * @qid: The AP queue number | |
489 | * @queue_depth: Pointer to queue depth value | |
490 | * @device_type: Pointer to device type value | |
491 | * | |
492 | * The test is repeated for AP_MAX_RESET times. | |
1534c382 MS |
493 | */ |
494 | static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type) | |
495 | { | |
496 | struct ap_queue_status status; | |
497 | int t_depth, t_device_type, rc, i; | |
498 | ||
499 | rc = -EBUSY; | |
500 | for (i = 0; i < AP_MAX_RESET; i++) { | |
501 | status = ap_test_queue(qid, &t_depth, &t_device_type); | |
502 | switch (status.response_code) { | |
503 | case AP_RESPONSE_NORMAL: | |
504 | *queue_depth = t_depth + 1; | |
505 | *device_type = t_device_type; | |
506 | rc = 0; | |
507 | break; | |
508 | case AP_RESPONSE_Q_NOT_AVAIL: | |
509 | rc = -ENODEV; | |
510 | break; | |
511 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
512 | break; | |
513 | case AP_RESPONSE_DECONFIGURED: | |
514 | rc = -ENODEV; | |
515 | break; | |
516 | case AP_RESPONSE_CHECKSTOPPED: | |
517 | rc = -ENODEV; | |
518 | break; | |
cb17a636 FB |
519 | case AP_RESPONSE_INVALID_ADDRESS: |
520 | rc = -ENODEV; | |
521 | break; | |
522 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
523 | break; | |
1534c382 MS |
524 | case AP_RESPONSE_BUSY: |
525 | break; | |
526 | default: | |
527 | BUG(); | |
528 | } | |
529 | if (rc != -EBUSY) | |
530 | break; | |
531 | if (i < AP_MAX_RESET - 1) | |
532 | udelay(5); | |
533 | } | |
534 | return rc; | |
535 | } | |
536 | ||
537 | /** | |
1749a81d FB |
538 | * ap_init_queue(): Reset an AP queue. |
539 | * @qid: The AP queue number | |
540 | * | |
1534c382 | 541 | * Reset an AP queue and wait for it to become available again. |
1534c382 MS |
542 | */ |
543 | static int ap_init_queue(ap_qid_t qid) | |
544 | { | |
545 | struct ap_queue_status status; | |
546 | int rc, dummy, i; | |
547 | ||
548 | rc = -ENODEV; | |
549 | status = ap_reset_queue(qid); | |
550 | for (i = 0; i < AP_MAX_RESET; i++) { | |
551 | switch (status.response_code) { | |
552 | case AP_RESPONSE_NORMAL: | |
553 | if (status.queue_empty) | |
554 | rc = 0; | |
555 | break; | |
556 | case AP_RESPONSE_Q_NOT_AVAIL: | |
557 | case AP_RESPONSE_DECONFIGURED: | |
558 | case AP_RESPONSE_CHECKSTOPPED: | |
559 | i = AP_MAX_RESET; /* return with -ENODEV */ | |
560 | break; | |
561 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
af512ed0 | 562 | rc = -EBUSY; |
1534c382 MS |
563 | case AP_RESPONSE_BUSY: |
564 | default: | |
565 | break; | |
566 | } | |
af512ed0 | 567 | if (rc != -ENODEV && rc != -EBUSY) |
1534c382 MS |
568 | break; |
569 | if (i < AP_MAX_RESET - 1) { | |
570 | udelay(5); | |
571 | status = ap_test_queue(qid, &dummy, &dummy); | |
572 | } | |
573 | } | |
cb17a636 FB |
574 | if (rc == 0 && ap_using_interrupts()) { |
575 | rc = ap_queue_enable_interruption(qid, ap_interrupt_indicator); | |
576 | /* If interruption mode is supported by the machine, | |
577 | * but an AP can not be enabled for interruption then | |
578 | * the AP will be discarded. */ | |
579 | if (rc) | |
580 | pr_err("Registering adapter interrupts for " | |
581 | "AP %d failed\n", AP_QID_DEVICE(qid)); | |
582 | } | |
1534c382 MS |
583 | return rc; |
584 | } | |
585 | ||
af512ed0 | 586 | /** |
1749a81d FB |
587 | * ap_increase_queue_count(): Arm request timeout. |
588 | * @ap_dev: Pointer to an AP device. | |
589 | * | |
590 | * Arm request timeout if an AP device was idle and a new request is submitted. | |
af512ed0 RW |
591 | */ |
592 | static void ap_increase_queue_count(struct ap_device *ap_dev) | |
593 | { | |
594 | int timeout = ap_dev->drv->request_timeout; | |
595 | ||
596 | ap_dev->queue_count++; | |
597 | if (ap_dev->queue_count == 1) { | |
598 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
599 | ap_dev->reset = AP_RESET_ARMED; | |
600 | } | |
601 | } | |
602 | ||
603 | /** | |
1749a81d FB |
604 | * ap_decrease_queue_count(): Decrease queue count. |
605 | * @ap_dev: Pointer to an AP device. | |
606 | * | |
607 | * If AP device is still alive, re-schedule request timeout if there are still | |
af512ed0 RW |
608 | * pending requests. |
609 | */ | |
610 | static void ap_decrease_queue_count(struct ap_device *ap_dev) | |
611 | { | |
612 | int timeout = ap_dev->drv->request_timeout; | |
613 | ||
614 | ap_dev->queue_count--; | |
615 | if (ap_dev->queue_count > 0) | |
616 | mod_timer(&ap_dev->timeout, jiffies + timeout); | |
617 | else | |
1749a81d | 618 | /* |
af512ed0 RW |
619 | * The timeout timer should to be disabled now - since |
620 | * del_timer_sync() is very expensive, we just tell via the | |
621 | * reset flag to ignore the pending timeout timer. | |
622 | */ | |
623 | ap_dev->reset = AP_RESET_IGNORE; | |
624 | } | |
625 | ||
1749a81d | 626 | /* |
1534c382 MS |
627 | * AP device related attributes. |
628 | */ | |
629 | static ssize_t ap_hwtype_show(struct device *dev, | |
630 | struct device_attribute *attr, char *buf) | |
631 | { | |
632 | struct ap_device *ap_dev = to_ap_dev(dev); | |
633 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); | |
634 | } | |
1534c382 | 635 | |
43c207e6 | 636 | static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); |
1534c382 MS |
637 | static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr, |
638 | char *buf) | |
639 | { | |
640 | struct ap_device *ap_dev = to_ap_dev(dev); | |
641 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth); | |
642 | } | |
1534c382 | 643 | |
43c207e6 | 644 | static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); |
1534c382 MS |
645 | static ssize_t ap_request_count_show(struct device *dev, |
646 | struct device_attribute *attr, | |
647 | char *buf) | |
648 | { | |
649 | struct ap_device *ap_dev = to_ap_dev(dev); | |
650 | int rc; | |
651 | ||
652 | spin_lock_bh(&ap_dev->lock); | |
653 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count); | |
654 | spin_unlock_bh(&ap_dev->lock); | |
655 | return rc; | |
656 | } | |
657 | ||
658 | static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); | |
659 | ||
660 | static ssize_t ap_modalias_show(struct device *dev, | |
661 | struct device_attribute *attr, char *buf) | |
662 | { | |
663 | return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type); | |
664 | } | |
665 | ||
666 | static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); | |
667 | ||
668 | static struct attribute *ap_dev_attrs[] = { | |
669 | &dev_attr_hwtype.attr, | |
670 | &dev_attr_depth.attr, | |
671 | &dev_attr_request_count.attr, | |
672 | &dev_attr_modalias.attr, | |
673 | NULL | |
674 | }; | |
675 | static struct attribute_group ap_dev_attr_group = { | |
676 | .attrs = ap_dev_attrs | |
677 | }; | |
678 | ||
679 | /** | |
1749a81d FB |
680 | * ap_bus_match() |
681 | * @dev: Pointer to device | |
682 | * @drv: Pointer to device_driver | |
683 | * | |
1534c382 MS |
684 | * AP bus driver registration/unregistration. |
685 | */ | |
686 | static int ap_bus_match(struct device *dev, struct device_driver *drv) | |
687 | { | |
688 | struct ap_device *ap_dev = to_ap_dev(dev); | |
689 | struct ap_driver *ap_drv = to_ap_drv(drv); | |
690 | struct ap_device_id *id; | |
691 | ||
1749a81d | 692 | /* |
1534c382 MS |
693 | * Compare device type of the device with the list of |
694 | * supported types of the device_driver. | |
695 | */ | |
696 | for (id = ap_drv->ids; id->match_flags; id++) { | |
697 | if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) && | |
698 | (id->dev_type != ap_dev->device_type)) | |
699 | continue; | |
700 | return 1; | |
701 | } | |
702 | return 0; | |
703 | } | |
704 | ||
705 | /** | |
1749a81d FB |
706 | * ap_uevent(): Uevent function for AP devices. |
707 | * @dev: Pointer to device | |
708 | * @env: Pointer to kobj_uevent_env | |
709 | * | |
710 | * It sets up a single environment variable DEV_TYPE which contains the | |
711 | * hardware device type. | |
1534c382 | 712 | */ |
7eff2e7a | 713 | static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) |
1534c382 MS |
714 | { |
715 | struct ap_device *ap_dev = to_ap_dev(dev); | |
7eff2e7a | 716 | int retval = 0; |
1534c382 MS |
717 | |
718 | if (!ap_dev) | |
719 | return -ENODEV; | |
720 | ||
721 | /* Set up DEV_TYPE environment variable. */ | |
7eff2e7a | 722 | retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); |
bf62456e ER |
723 | if (retval) |
724 | return retval; | |
725 | ||
66a4263b | 726 | /* Add MODALIAS= */ |
7eff2e7a | 727 | retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); |
bf62456e | 728 | |
bf62456e | 729 | return retval; |
1534c382 MS |
730 | } |
731 | ||
772f5472 FB |
732 | static int ap_bus_suspend(struct device *dev, pm_message_t state) |
733 | { | |
734 | struct ap_device *ap_dev = to_ap_dev(dev); | |
735 | unsigned long flags; | |
736 | ||
737 | if (!ap_suspend_flag) { | |
738 | ap_suspend_flag = 1; | |
739 | ||
740 | /* Disable scanning for devices, thus we do not want to scan | |
741 | * for them after removing. | |
742 | */ | |
743 | del_timer_sync(&ap_config_timer); | |
744 | if (ap_work_queue != NULL) { | |
745 | destroy_workqueue(ap_work_queue); | |
746 | ap_work_queue = NULL; | |
747 | } | |
5314af69 | 748 | |
772f5472 FB |
749 | tasklet_disable(&ap_tasklet); |
750 | } | |
751 | /* Poll on the device until all requests are finished. */ | |
752 | do { | |
753 | flags = 0; | |
95f1556c | 754 | spin_lock_bh(&ap_dev->lock); |
772f5472 | 755 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 756 | spin_unlock_bh(&ap_dev->lock); |
772f5472 FB |
757 | } while ((flags & 1) || (flags & 2)); |
758 | ||
5314af69 FB |
759 | spin_lock_bh(&ap_dev->lock); |
760 | ap_dev->unregistered = 1; | |
761 | spin_unlock_bh(&ap_dev->lock); | |
762 | ||
772f5472 FB |
763 | return 0; |
764 | } | |
765 | ||
766 | static int ap_bus_resume(struct device *dev) | |
767 | { | |
768 | int rc = 0; | |
769 | struct ap_device *ap_dev = to_ap_dev(dev); | |
770 | ||
771 | if (ap_suspend_flag) { | |
772 | ap_suspend_flag = 0; | |
773 | if (!ap_interrupts_available()) | |
774 | ap_interrupt_indicator = NULL; | |
5314af69 FB |
775 | if (!user_set_domain) { |
776 | ap_domain_index = -1; | |
777 | ap_select_domain(); | |
778 | } | |
772f5472 FB |
779 | init_timer(&ap_config_timer); |
780 | ap_config_timer.function = ap_config_timeout; | |
781 | ap_config_timer.data = 0; | |
782 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
783 | add_timer(&ap_config_timer); | |
784 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
785 | if (!ap_work_queue) | |
786 | return -ENOMEM; | |
787 | tasklet_enable(&ap_tasklet); | |
788 | if (!ap_using_interrupts()) | |
789 | ap_schedule_poll_timer(); | |
790 | else | |
791 | tasklet_schedule(&ap_tasklet); | |
792 | if (ap_thread_flag) | |
793 | rc = ap_poll_thread_start(); | |
772f5472 | 794 | } |
5314af69 FB |
795 | if (AP_QID_QUEUE(ap_dev->qid) != ap_domain_index) { |
796 | spin_lock_bh(&ap_dev->lock); | |
797 | ap_dev->qid = AP_MKQID(AP_QID_DEVICE(ap_dev->qid), | |
798 | ap_domain_index); | |
799 | spin_unlock_bh(&ap_dev->lock); | |
800 | } | |
801 | queue_work(ap_work_queue, &ap_config_work); | |
772f5472 FB |
802 | |
803 | return rc; | |
804 | } | |
805 | ||
1534c382 MS |
806 | static struct bus_type ap_bus_type = { |
807 | .name = "ap", | |
808 | .match = &ap_bus_match, | |
809 | .uevent = &ap_uevent, | |
772f5472 FB |
810 | .suspend = ap_bus_suspend, |
811 | .resume = ap_bus_resume | |
1534c382 MS |
812 | }; |
813 | ||
814 | static int ap_device_probe(struct device *dev) | |
815 | { | |
816 | struct ap_device *ap_dev = to_ap_dev(dev); | |
817 | struct ap_driver *ap_drv = to_ap_drv(dev->driver); | |
818 | int rc; | |
819 | ||
820 | ap_dev->drv = ap_drv; | |
821 | rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; | |
faa582ca | 822 | if (!rc) { |
43c207e6 | 823 | spin_lock_bh(&ap_device_list_lock); |
faa582ca | 824 | list_add(&ap_dev->list, &ap_device_list); |
43c207e6 | 825 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca | 826 | } |
1534c382 MS |
827 | return rc; |
828 | } | |
829 | ||
830 | /** | |
1749a81d FB |
831 | * __ap_flush_queue(): Flush requests. |
832 | * @ap_dev: Pointer to the AP device | |
833 | * | |
1534c382 | 834 | * Flush all requests from the request/pending queue of an AP device. |
1534c382 | 835 | */ |
4d284cac | 836 | static void __ap_flush_queue(struct ap_device *ap_dev) |
1534c382 MS |
837 | { |
838 | struct ap_message *ap_msg, *next; | |
839 | ||
840 | list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) { | |
841 | list_del_init(&ap_msg->list); | |
842 | ap_dev->pendingq_count--; | |
54a8f561 | 843 | ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); |
1534c382 MS |
844 | } |
845 | list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) { | |
846 | list_del_init(&ap_msg->list); | |
847 | ap_dev->requestq_count--; | |
54a8f561 | 848 | ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); |
1534c382 MS |
849 | } |
850 | } | |
851 | ||
852 | void ap_flush_queue(struct ap_device *ap_dev) | |
853 | { | |
854 | spin_lock_bh(&ap_dev->lock); | |
855 | __ap_flush_queue(ap_dev); | |
856 | spin_unlock_bh(&ap_dev->lock); | |
857 | } | |
858 | EXPORT_SYMBOL(ap_flush_queue); | |
859 | ||
860 | static int ap_device_remove(struct device *dev) | |
861 | { | |
862 | struct ap_device *ap_dev = to_ap_dev(dev); | |
863 | struct ap_driver *ap_drv = ap_dev->drv; | |
864 | ||
4e56296d | 865 | ap_flush_queue(ap_dev); |
af512ed0 | 866 | del_timer_sync(&ap_dev->timeout); |
43c207e6 | 867 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 868 | list_del_init(&ap_dev->list); |
43c207e6 | 869 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca RW |
870 | if (ap_drv->remove) |
871 | ap_drv->remove(ap_dev); | |
e675c0d2 RW |
872 | spin_lock_bh(&ap_dev->lock); |
873 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
874 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
875 | return 0; |
876 | } | |
877 | ||
878 | int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, | |
879 | char *name) | |
880 | { | |
881 | struct device_driver *drv = &ap_drv->driver; | |
882 | ||
883 | drv->bus = &ap_bus_type; | |
884 | drv->probe = ap_device_probe; | |
885 | drv->remove = ap_device_remove; | |
886 | drv->owner = owner; | |
887 | drv->name = name; | |
888 | return driver_register(drv); | |
889 | } | |
890 | EXPORT_SYMBOL(ap_driver_register); | |
891 | ||
892 | void ap_driver_unregister(struct ap_driver *ap_drv) | |
893 | { | |
894 | driver_unregister(&ap_drv->driver); | |
895 | } | |
896 | EXPORT_SYMBOL(ap_driver_unregister); | |
897 | ||
1749a81d | 898 | /* |
1534c382 MS |
899 | * AP bus attributes. |
900 | */ | |
901 | static ssize_t ap_domain_show(struct bus_type *bus, char *buf) | |
902 | { | |
903 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); | |
904 | } | |
905 | ||
906 | static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL); | |
907 | ||
908 | static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) | |
909 | { | |
910 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); | |
911 | } | |
912 | ||
cb17a636 FB |
913 | static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) |
914 | { | |
915 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
916 | ap_using_interrupts() ? 1 : 0); | |
917 | } | |
918 | ||
919 | static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); | |
920 | ||
1534c382 MS |
921 | static ssize_t ap_config_time_store(struct bus_type *bus, |
922 | const char *buf, size_t count) | |
923 | { | |
924 | int time; | |
925 | ||
926 | if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) | |
927 | return -EINVAL; | |
928 | ap_config_time = time; | |
929 | if (!timer_pending(&ap_config_timer) || | |
930 | !mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) { | |
931 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
932 | add_timer(&ap_config_timer); | |
933 | } | |
934 | return count; | |
935 | } | |
936 | ||
937 | static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); | |
938 | ||
939 | static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) | |
940 | { | |
941 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); | |
942 | } | |
943 | ||
944 | static ssize_t ap_poll_thread_store(struct bus_type *bus, | |
945 | const char *buf, size_t count) | |
946 | { | |
947 | int flag, rc; | |
948 | ||
949 | if (sscanf(buf, "%d\n", &flag) != 1) | |
950 | return -EINVAL; | |
951 | if (flag) { | |
952 | rc = ap_poll_thread_start(); | |
953 | if (rc) | |
954 | return rc; | |
955 | } | |
956 | else | |
957 | ap_poll_thread_stop(); | |
958 | return count; | |
959 | } | |
960 | ||
961 | static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); | |
962 | ||
fe137230 FB |
963 | static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) |
964 | { | |
965 | return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); | |
966 | } | |
967 | ||
968 | static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, | |
969 | size_t count) | |
970 | { | |
971 | unsigned long long time; | |
972 | ktime_t hr_time; | |
973 | ||
974 | /* 120 seconds = maximum poll interval */ | |
cb17a636 FB |
975 | if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || |
976 | time > 120000000000ULL) | |
fe137230 FB |
977 | return -EINVAL; |
978 | poll_timeout = time; | |
979 | hr_time = ktime_set(0, poll_timeout); | |
980 | ||
981 | if (!hrtimer_is_queued(&ap_poll_timer) || | |
6c644eae AV |
982 | !hrtimer_forward(&ap_poll_timer, hrtimer_get_expires(&ap_poll_timer), hr_time)) { |
983 | hrtimer_set_expires(&ap_poll_timer, hr_time); | |
984 | hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); | |
fe137230 FB |
985 | } |
986 | return count; | |
987 | } | |
988 | ||
989 | static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); | |
990 | ||
1534c382 MS |
991 | static struct bus_attribute *const ap_bus_attrs[] = { |
992 | &bus_attr_ap_domain, | |
993 | &bus_attr_config_time, | |
994 | &bus_attr_poll_thread, | |
cb17a636 | 995 | &bus_attr_ap_interrupts, |
fe137230 FB |
996 | &bus_attr_poll_timeout, |
997 | NULL, | |
1534c382 MS |
998 | }; |
999 | ||
1000 | /** | |
1749a81d FB |
1001 | * ap_select_domain(): Select an AP domain. |
1002 | * | |
1003 | * Pick one of the 16 AP domains. | |
1534c382 | 1004 | */ |
4d284cac | 1005 | static int ap_select_domain(void) |
1534c382 MS |
1006 | { |
1007 | int queue_depth, device_type, count, max_count, best_domain; | |
1008 | int rc, i, j; | |
1009 | ||
1749a81d | 1010 | /* |
1534c382 MS |
1011 | * We want to use a single domain. Either the one specified with |
1012 | * the "domain=" parameter or the domain with the maximum number | |
1013 | * of devices. | |
1014 | */ | |
1015 | if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS) | |
1016 | /* Domain has already been selected. */ | |
1017 | return 0; | |
1018 | best_domain = -1; | |
1019 | max_count = 0; | |
1020 | for (i = 0; i < AP_DOMAINS; i++) { | |
1021 | count = 0; | |
1022 | for (j = 0; j < AP_DEVICES; j++) { | |
1023 | ap_qid_t qid = AP_MKQID(j, i); | |
1024 | rc = ap_query_queue(qid, &queue_depth, &device_type); | |
1025 | if (rc) | |
1026 | continue; | |
1027 | count++; | |
1028 | } | |
1029 | if (count > max_count) { | |
1030 | max_count = count; | |
1031 | best_domain = i; | |
1032 | } | |
1033 | } | |
1034 | if (best_domain >= 0){ | |
1035 | ap_domain_index = best_domain; | |
1036 | return 0; | |
1037 | } | |
1038 | return -ENODEV; | |
1039 | } | |
1040 | ||
1041 | /** | |
1749a81d | 1042 | * ap_probe_device_type(): Find the device type of an AP. |
1534c382 | 1043 | * @ap_dev: pointer to the AP device. |
1749a81d FB |
1044 | * |
1045 | * Find the device type if query queue returned a device type of 0. | |
1534c382 MS |
1046 | */ |
1047 | static int ap_probe_device_type(struct ap_device *ap_dev) | |
1048 | { | |
1049 | static unsigned char msg[] = { | |
1050 | 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00, | |
1051 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1052 | 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00, | |
1053 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1054 | 0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50, | |
1055 | 0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01, | |
1056 | 0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00, | |
1057 | 0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00, | |
1058 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1059 | 0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00, | |
1060 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1061 | 0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00, | |
1062 | 0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00, | |
1063 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1064 | 0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00, | |
1065 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1066 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1067 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1068 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1069 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1070 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1071 | 0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00, | |
1072 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, | |
1073 | 0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00, | |
1074 | 0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20, | |
1075 | 0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53, | |
1076 | 0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22, | |
1077 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
1078 | 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88, | |
1079 | 0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66, | |
1080 | 0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44, | |
1081 | 0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22, | |
1082 | 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, | |
1083 | 0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77, | |
1084 | 0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00, | |
1085 | 0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00, | |
1086 | 0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01, | |
1087 | 0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c, | |
1088 | 0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68, | |
1089 | 0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66, | |
1090 | 0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0, | |
1091 | 0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8, | |
1092 | 0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04, | |
1093 | 0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57, | |
1094 | 0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d, | |
1095 | }; | |
1096 | struct ap_queue_status status; | |
1097 | unsigned long long psmid; | |
1098 | char *reply; | |
1099 | int rc, i; | |
1100 | ||
1101 | reply = (void *) get_zeroed_page(GFP_KERNEL); | |
1102 | if (!reply) { | |
1103 | rc = -ENOMEM; | |
1104 | goto out; | |
1105 | } | |
1106 | ||
1107 | status = __ap_send(ap_dev->qid, 0x0102030405060708ULL, | |
a6a5d73a | 1108 | msg, sizeof(msg), 0); |
1534c382 MS |
1109 | if (status.response_code != AP_RESPONSE_NORMAL) { |
1110 | rc = -ENODEV; | |
1111 | goto out_free; | |
1112 | } | |
1113 | ||
1114 | /* Wait for the test message to complete. */ | |
1115 | for (i = 0; i < 6; i++) { | |
1116 | mdelay(300); | |
1117 | status = __ap_recv(ap_dev->qid, &psmid, reply, 4096); | |
1118 | if (status.response_code == AP_RESPONSE_NORMAL && | |
1119 | psmid == 0x0102030405060708ULL) | |
1120 | break; | |
1121 | } | |
1122 | if (i < 6) { | |
1123 | /* Got an answer. */ | |
1124 | if (reply[0] == 0x00 && reply[1] == 0x86) | |
1125 | ap_dev->device_type = AP_DEVICE_TYPE_PCICC; | |
1126 | else | |
1127 | ap_dev->device_type = AP_DEVICE_TYPE_PCICA; | |
1128 | rc = 0; | |
1129 | } else | |
1130 | rc = -ENODEV; | |
1131 | ||
1132 | out_free: | |
1133 | free_page((unsigned long) reply); | |
1134 | out: | |
1135 | return rc; | |
1136 | } | |
1137 | ||
cb17a636 FB |
1138 | static void ap_interrupt_handler(void *unused1, void *unused2) |
1139 | { | |
62d146ff | 1140 | kstat_cpu(smp_processor_id()).irqs[IOINT_APB]++; |
cb17a636 FB |
1141 | tasklet_schedule(&ap_tasklet); |
1142 | } | |
1143 | ||
1534c382 | 1144 | /** |
1749a81d FB |
1145 | * __ap_scan_bus(): Scan the AP bus. |
1146 | * @dev: Pointer to device | |
1147 | * @data: Pointer to data | |
1148 | * | |
1149 | * Scan the AP bus for new devices. | |
1534c382 MS |
1150 | */ |
1151 | static int __ap_scan_bus(struct device *dev, void *data) | |
1152 | { | |
1153 | return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data; | |
1154 | } | |
1155 | ||
1156 | static void ap_device_release(struct device *dev) | |
1157 | { | |
1158 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1159 | ||
1160 | kfree(ap_dev); | |
1161 | } | |
1162 | ||
4927b3f7 | 1163 | static void ap_scan_bus(struct work_struct *unused) |
1534c382 MS |
1164 | { |
1165 | struct ap_device *ap_dev; | |
1166 | struct device *dev; | |
1167 | ap_qid_t qid; | |
1168 | int queue_depth, device_type; | |
6bed05bc | 1169 | unsigned int device_functions; |
1534c382 MS |
1170 | int rc, i; |
1171 | ||
1172 | if (ap_select_domain() != 0) | |
1173 | return; | |
1174 | for (i = 0; i < AP_DEVICES; i++) { | |
1175 | qid = AP_MKQID(i, ap_domain_index); | |
1176 | dev = bus_find_device(&ap_bus_type, NULL, | |
1177 | (void *)(unsigned long)qid, | |
1178 | __ap_scan_bus); | |
f3b017d8 | 1179 | rc = ap_query_queue(qid, &queue_depth, &device_type); |
c6a48264 | 1180 | if (dev) { |
af512ed0 RW |
1181 | if (rc == -EBUSY) { |
1182 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1183 | schedule_timeout(AP_RESET_TIMEOUT); | |
1184 | rc = ap_query_queue(qid, &queue_depth, | |
1185 | &device_type); | |
1186 | } | |
c6a48264 RW |
1187 | ap_dev = to_ap_dev(dev); |
1188 | spin_lock_bh(&ap_dev->lock); | |
1189 | if (rc || ap_dev->unregistered) { | |
1190 | spin_unlock_bh(&ap_dev->lock); | |
5314af69 FB |
1191 | if (ap_dev->unregistered) |
1192 | i--; | |
c6a48264 | 1193 | device_unregister(dev); |
af512ed0 | 1194 | put_device(dev); |
c6a48264 | 1195 | continue; |
af512ed0 RW |
1196 | } |
1197 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
1198 | put_device(dev); |
1199 | continue; | |
1200 | } | |
1534c382 MS |
1201 | if (rc) |
1202 | continue; | |
1203 | rc = ap_init_queue(qid); | |
1204 | if (rc) | |
1205 | continue; | |
1206 | ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL); | |
1207 | if (!ap_dev) | |
1208 | break; | |
1209 | ap_dev->qid = qid; | |
1210 | ap_dev->queue_depth = queue_depth; | |
4e56296d | 1211 | ap_dev->unregistered = 1; |
1534c382 MS |
1212 | spin_lock_init(&ap_dev->lock); |
1213 | INIT_LIST_HEAD(&ap_dev->pendingq); | |
1214 | INIT_LIST_HEAD(&ap_dev->requestq); | |
cf352ce0 | 1215 | INIT_LIST_HEAD(&ap_dev->list); |
af512ed0 RW |
1216 | setup_timer(&ap_dev->timeout, ap_request_timeout, |
1217 | (unsigned long) ap_dev); | |
6bed05bc HD |
1218 | switch (device_type) { |
1219 | case 0: | |
cf2d007b HD |
1220 | if (ap_probe_device_type(ap_dev)) { |
1221 | kfree(ap_dev); | |
1222 | continue; | |
1223 | } | |
6bed05bc HD |
1224 | break; |
1225 | case 10: | |
1226 | if (ap_query_functions(qid, &device_functions)) { | |
1227 | kfree(ap_dev); | |
1228 | continue; | |
1229 | } | |
1230 | if (test_ap_facility(device_functions, 3)) | |
1231 | ap_dev->device_type = AP_DEVICE_TYPE_CEX3C; | |
1232 | else if (test_ap_facility(device_functions, 4)) | |
1233 | ap_dev->device_type = AP_DEVICE_TYPE_CEX3A; | |
1234 | else { | |
1235 | kfree(ap_dev); | |
1236 | continue; | |
1237 | } | |
1238 | break; | |
1239 | default: | |
1534c382 | 1240 | ap_dev->device_type = device_type; |
6bed05bc | 1241 | } |
1534c382 MS |
1242 | |
1243 | ap_dev->device.bus = &ap_bus_type; | |
1244 | ap_dev->device.parent = ap_root_device; | |
edc44fa0 FB |
1245 | if (dev_set_name(&ap_dev->device, "card%02x", |
1246 | AP_QID_DEVICE(ap_dev->qid))) { | |
1247 | kfree(ap_dev); | |
1248 | continue; | |
1249 | } | |
1534c382 MS |
1250 | ap_dev->device.release = ap_device_release; |
1251 | rc = device_register(&ap_dev->device); | |
1252 | if (rc) { | |
c6304933 | 1253 | put_device(&ap_dev->device); |
1534c382 MS |
1254 | continue; |
1255 | } | |
1256 | /* Add device attributes. */ | |
1257 | rc = sysfs_create_group(&ap_dev->device.kobj, | |
1258 | &ap_dev_attr_group); | |
4e56296d RW |
1259 | if (!rc) { |
1260 | spin_lock_bh(&ap_dev->lock); | |
1261 | ap_dev->unregistered = 0; | |
1262 | spin_unlock_bh(&ap_dev->lock); | |
1263 | } | |
1264 | else | |
1534c382 MS |
1265 | device_unregister(&ap_dev->device); |
1266 | } | |
1267 | } | |
1268 | ||
1269 | static void | |
1270 | ap_config_timeout(unsigned long ptr) | |
1271 | { | |
1272 | queue_work(ap_work_queue, &ap_config_work); | |
1273 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1274 | add_timer(&ap_config_timer); | |
1275 | } | |
1276 | ||
1277 | /** | |
bc615dea | 1278 | * __ap_schedule_poll_timer(): Schedule poll timer. |
1749a81d | 1279 | * |
1534c382 MS |
1280 | * Set up the timer to run the poll tasklet |
1281 | */ | |
bc615dea | 1282 | static inline void __ap_schedule_poll_timer(void) |
1534c382 | 1283 | { |
8d406c6d | 1284 | ktime_t hr_time; |
93521314 FB |
1285 | |
1286 | spin_lock_bh(&ap_poll_timer_lock); | |
bc615dea | 1287 | if (hrtimer_is_queued(&ap_poll_timer) || ap_suspend_flag) |
93521314 | 1288 | goto out; |
8d406c6d FB |
1289 | if (ktime_to_ns(hrtimer_expires_remaining(&ap_poll_timer)) <= 0) { |
1290 | hr_time = ktime_set(0, poll_timeout); | |
1291 | hrtimer_forward_now(&ap_poll_timer, hr_time); | |
1292 | hrtimer_restart(&ap_poll_timer); | |
1293 | } | |
93521314 FB |
1294 | out: |
1295 | spin_unlock_bh(&ap_poll_timer_lock); | |
1534c382 MS |
1296 | } |
1297 | ||
bc615dea HD |
1298 | /** |
1299 | * ap_schedule_poll_timer(): Schedule poll timer. | |
1300 | * | |
1301 | * Set up the timer to run the poll tasklet | |
1302 | */ | |
1303 | static inline void ap_schedule_poll_timer(void) | |
1304 | { | |
1305 | if (ap_using_interrupts()) | |
1306 | return; | |
1307 | __ap_schedule_poll_timer(); | |
1308 | } | |
1309 | ||
1534c382 | 1310 | /** |
1749a81d | 1311 | * ap_poll_read(): Receive pending reply messages from an AP device. |
1534c382 MS |
1312 | * @ap_dev: pointer to the AP device |
1313 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1314 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1315 | * |
1534c382 MS |
1316 | * Returns 0 if the device is still present, -ENODEV if not. |
1317 | */ | |
4d284cac | 1318 | static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1319 | { |
1320 | struct ap_queue_status status; | |
1321 | struct ap_message *ap_msg; | |
1322 | ||
1323 | if (ap_dev->queue_count <= 0) | |
1324 | return 0; | |
1325 | status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid, | |
1326 | ap_dev->reply->message, ap_dev->reply->length); | |
1327 | switch (status.response_code) { | |
1328 | case AP_RESPONSE_NORMAL: | |
1329 | atomic_dec(&ap_poll_requests); | |
af512ed0 | 1330 | ap_decrease_queue_count(ap_dev); |
1534c382 MS |
1331 | list_for_each_entry(ap_msg, &ap_dev->pendingq, list) { |
1332 | if (ap_msg->psmid != ap_dev->reply->psmid) | |
1333 | continue; | |
1334 | list_del_init(&ap_msg->list); | |
1335 | ap_dev->pendingq_count--; | |
54a8f561 | 1336 | ap_msg->receive(ap_dev, ap_msg, ap_dev->reply); |
1534c382 MS |
1337 | break; |
1338 | } | |
1339 | if (ap_dev->queue_count > 0) | |
1340 | *flags |= 1; | |
1341 | break; | |
1342 | case AP_RESPONSE_NO_PENDING_REPLY: | |
1343 | if (status.queue_empty) { | |
1344 | /* The card shouldn't forget requests but who knows. */ | |
e675c0d2 | 1345 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); |
1534c382 MS |
1346 | ap_dev->queue_count = 0; |
1347 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1348 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1349 | ap_dev->pendingq_count = 0; | |
1350 | } else | |
1351 | *flags |= 2; | |
1352 | break; | |
1353 | default: | |
1354 | return -ENODEV; | |
1355 | } | |
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | /** | |
1749a81d | 1360 | * ap_poll_write(): Send messages from the request queue to an AP device. |
1534c382 MS |
1361 | * @ap_dev: pointer to the AP device |
1362 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1363 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d | 1364 | * |
1534c382 MS |
1365 | * Returns 0 if the device is still present, -ENODEV if not. |
1366 | */ | |
4d284cac | 1367 | static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 MS |
1368 | { |
1369 | struct ap_queue_status status; | |
1370 | struct ap_message *ap_msg; | |
1371 | ||
1372 | if (ap_dev->requestq_count <= 0 || | |
1373 | ap_dev->queue_count >= ap_dev->queue_depth) | |
1374 | return 0; | |
1375 | /* Start the next request on the queue. */ | |
1376 | ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list); | |
1377 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
a6a5d73a | 1378 | ap_msg->message, ap_msg->length, ap_msg->special); |
1534c382 MS |
1379 | switch (status.response_code) { |
1380 | case AP_RESPONSE_NORMAL: | |
1381 | atomic_inc(&ap_poll_requests); | |
af512ed0 | 1382 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1383 | list_move_tail(&ap_msg->list, &ap_dev->pendingq); |
1384 | ap_dev->requestq_count--; | |
1385 | ap_dev->pendingq_count++; | |
1386 | if (ap_dev->queue_count < ap_dev->queue_depth && | |
1387 | ap_dev->requestq_count > 0) | |
1388 | *flags |= 1; | |
1389 | *flags |= 2; | |
1390 | break; | |
af512ed0 | 1391 | case AP_RESPONSE_RESET_IN_PROGRESS: |
bc615dea HD |
1392 | __ap_schedule_poll_timer(); |
1393 | case AP_RESPONSE_Q_FULL: | |
1534c382 MS |
1394 | *flags |= 2; |
1395 | break; | |
1396 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
a6a5d73a | 1397 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
1534c382 MS |
1398 | return -EINVAL; |
1399 | default: | |
1400 | return -ENODEV; | |
1401 | } | |
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | /** | |
1749a81d | 1406 | * ap_poll_queue(): Poll AP device for pending replies and send new messages. |
1534c382 MS |
1407 | * @ap_dev: pointer to the bus device |
1408 | * @flags: pointer to control flags, bit 2^0 is set if another poll is | |
1409 | * required, bit 2^1 is set if the poll timer needs to get armed | |
1749a81d FB |
1410 | * |
1411 | * Poll AP device for pending replies and send new messages. If either | |
1412 | * ap_poll_read or ap_poll_write returns -ENODEV unregister the device. | |
1534c382 MS |
1413 | * Returns 0. |
1414 | */ | |
1415 | static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags) | |
1416 | { | |
1417 | int rc; | |
1418 | ||
1419 | rc = ap_poll_read(ap_dev, flags); | |
1420 | if (rc) | |
1421 | return rc; | |
1422 | return ap_poll_write(ap_dev, flags); | |
1423 | } | |
1424 | ||
1425 | /** | |
1749a81d | 1426 | * __ap_queue_message(): Queue a message to a device. |
1534c382 MS |
1427 | * @ap_dev: pointer to the AP device |
1428 | * @ap_msg: the message to be queued | |
1749a81d FB |
1429 | * |
1430 | * Queue a message to a device. Returns 0 if successful. | |
1534c382 MS |
1431 | */ |
1432 | static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1433 | { | |
1434 | struct ap_queue_status status; | |
1435 | ||
1436 | if (list_empty(&ap_dev->requestq) && | |
1437 | ap_dev->queue_count < ap_dev->queue_depth) { | |
1438 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
a6a5d73a FB |
1439 | ap_msg->message, ap_msg->length, |
1440 | ap_msg->special); | |
1534c382 MS |
1441 | switch (status.response_code) { |
1442 | case AP_RESPONSE_NORMAL: | |
1443 | list_add_tail(&ap_msg->list, &ap_dev->pendingq); | |
1444 | atomic_inc(&ap_poll_requests); | |
1445 | ap_dev->pendingq_count++; | |
af512ed0 | 1446 | ap_increase_queue_count(ap_dev); |
1534c382 MS |
1447 | ap_dev->total_request_count++; |
1448 | break; | |
1449 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 1450 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 MS |
1451 | list_add_tail(&ap_msg->list, &ap_dev->requestq); |
1452 | ap_dev->requestq_count++; | |
1453 | ap_dev->total_request_count++; | |
1454 | return -EBUSY; | |
a6a5d73a | 1455 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
1534c382 | 1456 | case AP_RESPONSE_MESSAGE_TOO_BIG: |
54a8f561 | 1457 | ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL)); |
1534c382 MS |
1458 | return -EINVAL; |
1459 | default: /* Device is gone. */ | |
54a8f561 | 1460 | ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); |
1534c382 MS |
1461 | return -ENODEV; |
1462 | } | |
1463 | } else { | |
1464 | list_add_tail(&ap_msg->list, &ap_dev->requestq); | |
1465 | ap_dev->requestq_count++; | |
1466 | ap_dev->total_request_count++; | |
1467 | return -EBUSY; | |
1468 | } | |
1469 | ap_schedule_poll_timer(); | |
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1474 | { | |
1475 | unsigned long flags; | |
1476 | int rc; | |
1477 | ||
54a8f561 HD |
1478 | /* For asynchronous message handling a valid receive-callback |
1479 | * is required. */ | |
1480 | BUG_ON(!ap_msg->receive); | |
1481 | ||
1534c382 MS |
1482 | spin_lock_bh(&ap_dev->lock); |
1483 | if (!ap_dev->unregistered) { | |
1484 | /* Make room on the queue by polling for finished requests. */ | |
1485 | rc = ap_poll_queue(ap_dev, &flags); | |
1486 | if (!rc) | |
1487 | rc = __ap_queue_message(ap_dev, ap_msg); | |
1488 | if (!rc) | |
1489 | wake_up(&ap_poll_wait); | |
4e56296d RW |
1490 | if (rc == -ENODEV) |
1491 | ap_dev->unregistered = 1; | |
1534c382 | 1492 | } else { |
54a8f561 | 1493 | ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); |
c6a48264 | 1494 | rc = -ENODEV; |
1534c382 MS |
1495 | } |
1496 | spin_unlock_bh(&ap_dev->lock); | |
1497 | if (rc == -ENODEV) | |
1498 | device_unregister(&ap_dev->device); | |
1499 | } | |
1500 | EXPORT_SYMBOL(ap_queue_message); | |
1501 | ||
1502 | /** | |
1749a81d FB |
1503 | * ap_cancel_message(): Cancel a crypto request. |
1504 | * @ap_dev: The AP device that has the message queued | |
1505 | * @ap_msg: The message that is to be removed | |
1506 | * | |
1534c382 | 1507 | * Cancel a crypto request. This is done by removing the request |
1749a81d | 1508 | * from the device pending or request queue. Note that the |
1534c382 MS |
1509 | * request stays on the AP queue. When it finishes the message |
1510 | * reply will be discarded because the psmid can't be found. | |
1534c382 MS |
1511 | */ |
1512 | void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1513 | { | |
1514 | struct ap_message *tmp; | |
1515 | ||
1516 | spin_lock_bh(&ap_dev->lock); | |
1517 | if (!list_empty(&ap_msg->list)) { | |
1518 | list_for_each_entry(tmp, &ap_dev->pendingq, list) | |
1519 | if (tmp->psmid == ap_msg->psmid) { | |
1520 | ap_dev->pendingq_count--; | |
1521 | goto found; | |
1522 | } | |
1523 | ap_dev->requestq_count--; | |
1524 | found: | |
1525 | list_del_init(&ap_msg->list); | |
1526 | } | |
1527 | spin_unlock_bh(&ap_dev->lock); | |
1528 | } | |
1529 | EXPORT_SYMBOL(ap_cancel_message); | |
1530 | ||
1531 | /** | |
1749a81d | 1532 | * ap_poll_timeout(): AP receive polling for finished AP requests. |
fe137230 | 1533 | * @unused: Unused pointer. |
1749a81d | 1534 | * |
fe137230 | 1535 | * Schedules the AP tasklet using a high resolution timer. |
1534c382 | 1536 | */ |
fe137230 | 1537 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) |
1534c382 MS |
1538 | { |
1539 | tasklet_schedule(&ap_tasklet); | |
fe137230 | 1540 | return HRTIMER_NORESTART; |
1534c382 MS |
1541 | } |
1542 | ||
af512ed0 | 1543 | /** |
1749a81d FB |
1544 | * ap_reset(): Reset a not responding AP device. |
1545 | * @ap_dev: Pointer to the AP device | |
1546 | * | |
af512ed0 RW |
1547 | * Reset a not responding AP device and move all requests from the |
1548 | * pending queue to the request queue. | |
1549 | */ | |
1550 | static void ap_reset(struct ap_device *ap_dev) | |
1551 | { | |
1552 | int rc; | |
1553 | ||
1554 | ap_dev->reset = AP_RESET_IGNORE; | |
1555 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
1556 | ap_dev->queue_count = 0; | |
1557 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
1558 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
1559 | ap_dev->pendingq_count = 0; | |
1560 | rc = ap_init_queue(ap_dev->qid); | |
1561 | if (rc == -ENODEV) | |
1562 | ap_dev->unregistered = 1; | |
75464960 HD |
1563 | else |
1564 | __ap_schedule_poll_timer(); | |
af512ed0 RW |
1565 | } |
1566 | ||
43c207e6 | 1567 | static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags) |
1534c382 | 1568 | { |
1534c382 | 1569 | if (!ap_dev->unregistered) { |
c6a48264 | 1570 | if (ap_poll_queue(ap_dev, flags)) |
4e56296d | 1571 | ap_dev->unregistered = 1; |
af512ed0 RW |
1572 | if (ap_dev->reset == AP_RESET_DO) |
1573 | ap_reset(ap_dev); | |
c6a48264 | 1574 | } |
1534c382 MS |
1575 | return 0; |
1576 | } | |
1577 | ||
1749a81d FB |
1578 | /** |
1579 | * ap_poll_all(): Poll all AP devices. | |
1580 | * @dummy: Unused variable | |
1581 | * | |
1582 | * Poll all AP devices on the bus in a round robin fashion. Continue | |
1583 | * polling until bit 2^0 of the control flags is not set. If bit 2^1 | |
1584 | * of the control flags has been set arm the poll timer. | |
1585 | */ | |
1534c382 MS |
1586 | static void ap_poll_all(unsigned long dummy) |
1587 | { | |
1588 | unsigned long flags; | |
cf352ce0 | 1589 | struct ap_device *ap_dev; |
1534c382 | 1590 | |
cb17a636 FB |
1591 | /* Reset the indicator if interrupts are used. Thus new interrupts can |
1592 | * be received. Doing it in the beginning of the tasklet is therefor | |
1593 | * important that no requests on any AP get lost. | |
1594 | */ | |
1595 | if (ap_using_interrupts()) | |
1596 | xchg((u8 *)ap_interrupt_indicator, 0); | |
1534c382 MS |
1597 | do { |
1598 | flags = 0; | |
43c207e6 | 1599 | spin_lock(&ap_device_list_lock); |
cf352ce0 | 1600 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
95f1556c | 1601 | spin_lock(&ap_dev->lock); |
43c207e6 | 1602 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 1603 | spin_unlock(&ap_dev->lock); |
cf352ce0 | 1604 | } |
43c207e6 | 1605 | spin_unlock(&ap_device_list_lock); |
1534c382 MS |
1606 | } while (flags & 1); |
1607 | if (flags & 2) | |
1608 | ap_schedule_poll_timer(); | |
1609 | } | |
1610 | ||
1611 | /** | |
1749a81d FB |
1612 | * ap_poll_thread(): Thread that polls for finished requests. |
1613 | * @data: Unused pointer | |
1614 | * | |
1534c382 MS |
1615 | * AP bus poll thread. The purpose of this thread is to poll for |
1616 | * finished requests in a loop if there is a "free" cpu - that is | |
1617 | * a cpu that doesn't have anything better to do. The polling stops | |
1618 | * as soon as there is another task or if all messages have been | |
1619 | * delivered. | |
1620 | */ | |
1621 | static int ap_poll_thread(void *data) | |
1622 | { | |
1623 | DECLARE_WAITQUEUE(wait, current); | |
1624 | unsigned long flags; | |
1625 | int requests; | |
cf352ce0 | 1626 | struct ap_device *ap_dev; |
1534c382 | 1627 | |
d83682b3 | 1628 | set_user_nice(current, 19); |
1534c382 | 1629 | while (1) { |
772f5472 FB |
1630 | if (ap_suspend_flag) |
1631 | return 0; | |
1534c382 MS |
1632 | if (need_resched()) { |
1633 | schedule(); | |
1634 | continue; | |
1635 | } | |
1636 | add_wait_queue(&ap_poll_wait, &wait); | |
1637 | set_current_state(TASK_INTERRUPTIBLE); | |
1638 | if (kthread_should_stop()) | |
1639 | break; | |
1640 | requests = atomic_read(&ap_poll_requests); | |
1641 | if (requests <= 0) | |
1642 | schedule(); | |
1643 | set_current_state(TASK_RUNNING); | |
1644 | remove_wait_queue(&ap_poll_wait, &wait); | |
1645 | ||
1534c382 | 1646 | flags = 0; |
43c207e6 | 1647 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 1648 | list_for_each_entry(ap_dev, &ap_device_list, list) { |
95f1556c | 1649 | spin_lock(&ap_dev->lock); |
43c207e6 | 1650 | __ap_poll_device(ap_dev, &flags); |
95f1556c | 1651 | spin_unlock(&ap_dev->lock); |
cf352ce0 | 1652 | } |
43c207e6 | 1653 | spin_unlock_bh(&ap_device_list_lock); |
1534c382 MS |
1654 | } |
1655 | set_current_state(TASK_RUNNING); | |
1656 | remove_wait_queue(&ap_poll_wait, &wait); | |
1657 | return 0; | |
1658 | } | |
1659 | ||
1660 | static int ap_poll_thread_start(void) | |
1661 | { | |
1662 | int rc; | |
1663 | ||
772f5472 | 1664 | if (ap_using_interrupts() || ap_suspend_flag) |
cb17a636 | 1665 | return 0; |
1534c382 MS |
1666 | mutex_lock(&ap_poll_thread_mutex); |
1667 | if (!ap_poll_kthread) { | |
1668 | ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); | |
1669 | rc = IS_ERR(ap_poll_kthread) ? PTR_ERR(ap_poll_kthread) : 0; | |
1670 | if (rc) | |
1671 | ap_poll_kthread = NULL; | |
1672 | } | |
1673 | else | |
1674 | rc = 0; | |
1675 | mutex_unlock(&ap_poll_thread_mutex); | |
1676 | return rc; | |
1677 | } | |
1678 | ||
1679 | static void ap_poll_thread_stop(void) | |
1680 | { | |
1681 | mutex_lock(&ap_poll_thread_mutex); | |
1682 | if (ap_poll_kthread) { | |
1683 | kthread_stop(ap_poll_kthread); | |
1684 | ap_poll_kthread = NULL; | |
1685 | } | |
1686 | mutex_unlock(&ap_poll_thread_mutex); | |
1687 | } | |
1688 | ||
af512ed0 | 1689 | /** |
1749a81d FB |
1690 | * ap_request_timeout(): Handling of request timeouts |
1691 | * @data: Holds the AP device. | |
1692 | * | |
1693 | * Handles request timeouts. | |
af512ed0 RW |
1694 | */ |
1695 | static void ap_request_timeout(unsigned long data) | |
1696 | { | |
1697 | struct ap_device *ap_dev = (struct ap_device *) data; | |
1698 | ||
cb17a636 | 1699 | if (ap_dev->reset == AP_RESET_ARMED) { |
af512ed0 | 1700 | ap_dev->reset = AP_RESET_DO; |
cb17a636 FB |
1701 | |
1702 | if (ap_using_interrupts()) | |
1703 | tasklet_schedule(&ap_tasklet); | |
1704 | } | |
af512ed0 RW |
1705 | } |
1706 | ||
13e742ba RW |
1707 | static void ap_reset_domain(void) |
1708 | { | |
1709 | int i; | |
1710 | ||
39aa7cf6 RW |
1711 | if (ap_domain_index != -1) |
1712 | for (i = 0; i < AP_DEVICES; i++) | |
1713 | ap_reset_queue(AP_MKQID(i, ap_domain_index)); | |
13e742ba RW |
1714 | } |
1715 | ||
1716 | static void ap_reset_all(void) | |
85eca850 RW |
1717 | { |
1718 | int i, j; | |
1719 | ||
1720 | for (i = 0; i < AP_DOMAINS; i++) | |
1721 | for (j = 0; j < AP_DEVICES; j++) | |
1722 | ap_reset_queue(AP_MKQID(j, i)); | |
1723 | } | |
1724 | ||
1725 | static struct reset_call ap_reset_call = { | |
13e742ba | 1726 | .fn = ap_reset_all, |
85eca850 RW |
1727 | }; |
1728 | ||
1534c382 | 1729 | /** |
1749a81d FB |
1730 | * ap_module_init(): The module initialization code. |
1731 | * | |
1732 | * Initializes the module. | |
1534c382 MS |
1733 | */ |
1734 | int __init ap_module_init(void) | |
1735 | { | |
1736 | int rc, i; | |
1737 | ||
1738 | if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) { | |
136f7a1c MS |
1739 | pr_warning("%d is not a valid cryptographic domain\n", |
1740 | ap_domain_index); | |
1534c382 MS |
1741 | return -EINVAL; |
1742 | } | |
5314af69 FB |
1743 | /* In resume callback we need to know if the user had set the domain. |
1744 | * If so, we can not just reset it. | |
1745 | */ | |
1746 | if (ap_domain_index >= 0) | |
1747 | user_set_domain = 1; | |
1748 | ||
1534c382 | 1749 | if (ap_instructions_available() != 0) { |
136f7a1c MS |
1750 | pr_warning("The hardware system does not support " |
1751 | "AP instructions\n"); | |
1534c382 MS |
1752 | return -ENODEV; |
1753 | } | |
cb17a636 FB |
1754 | if (ap_interrupts_available()) { |
1755 | isc_register(AP_ISC); | |
1756 | ap_interrupt_indicator = s390_register_adapter_interrupt( | |
1757 | &ap_interrupt_handler, NULL, AP_ISC); | |
1758 | if (IS_ERR(ap_interrupt_indicator)) { | |
1759 | ap_interrupt_indicator = NULL; | |
1760 | isc_unregister(AP_ISC); | |
1761 | } | |
1762 | } | |
1763 | ||
85eca850 | 1764 | register_reset_call(&ap_reset_call); |
1534c382 MS |
1765 | |
1766 | /* Create /sys/bus/ap. */ | |
1767 | rc = bus_register(&ap_bus_type); | |
1768 | if (rc) | |
1769 | goto out; | |
1770 | for (i = 0; ap_bus_attrs[i]; i++) { | |
1771 | rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); | |
1772 | if (rc) | |
1773 | goto out_bus; | |
1774 | } | |
1775 | ||
1776 | /* Create /sys/devices/ap. */ | |
035da16f | 1777 | ap_root_device = root_device_register("ap"); |
1534c382 MS |
1778 | rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0; |
1779 | if (rc) | |
1780 | goto out_bus; | |
1781 | ||
1782 | ap_work_queue = create_singlethread_workqueue("kapwork"); | |
1783 | if (!ap_work_queue) { | |
1784 | rc = -ENOMEM; | |
1785 | goto out_root; | |
1786 | } | |
1787 | ||
1788 | if (ap_select_domain() == 0) | |
1789 | ap_scan_bus(NULL); | |
1790 | ||
1749a81d | 1791 | /* Setup the AP bus rescan timer. */ |
1534c382 MS |
1792 | init_timer(&ap_config_timer); |
1793 | ap_config_timer.function = ap_config_timeout; | |
1794 | ap_config_timer.data = 0; | |
1795 | ap_config_timer.expires = jiffies + ap_config_time * HZ; | |
1796 | add_timer(&ap_config_timer); | |
1797 | ||
fe137230 FB |
1798 | /* Setup the high resultion poll timer. |
1799 | * If we are running under z/VM adjust polling to z/VM polling rate. | |
1800 | */ | |
1801 | if (MACHINE_IS_VM) | |
1802 | poll_timeout = 1500000; | |
93521314 | 1803 | spin_lock_init(&ap_poll_timer_lock); |
fe137230 FB |
1804 | hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
1805 | ap_poll_timer.function = ap_poll_timeout; | |
1806 | ||
1534c382 MS |
1807 | /* Start the low priority AP bus poll thread. */ |
1808 | if (ap_thread_flag) { | |
1809 | rc = ap_poll_thread_start(); | |
1810 | if (rc) | |
1811 | goto out_work; | |
1812 | } | |
1813 | ||
1814 | return 0; | |
1815 | ||
1816 | out_work: | |
1817 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1818 | hrtimer_cancel(&ap_poll_timer); |
1534c382 MS |
1819 | destroy_workqueue(ap_work_queue); |
1820 | out_root: | |
035da16f | 1821 | root_device_unregister(ap_root_device); |
1534c382 MS |
1822 | out_bus: |
1823 | while (i--) | |
1824 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1825 | bus_unregister(&ap_bus_type); | |
1826 | out: | |
85eca850 | 1827 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1828 | if (ap_using_interrupts()) { |
1829 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1830 | isc_unregister(AP_ISC); | |
1831 | } | |
1534c382 MS |
1832 | return rc; |
1833 | } | |
1834 | ||
1835 | static int __ap_match_all(struct device *dev, void *data) | |
1836 | { | |
1837 | return 1; | |
1838 | } | |
1839 | ||
1840 | /** | |
1749a81d FB |
1841 | * ap_modules_exit(): The module termination code |
1842 | * | |
1843 | * Terminates the module. | |
1534c382 MS |
1844 | */ |
1845 | void ap_module_exit(void) | |
1846 | { | |
1847 | int i; | |
1848 | struct device *dev; | |
1849 | ||
13e742ba | 1850 | ap_reset_domain(); |
1534c382 MS |
1851 | ap_poll_thread_stop(); |
1852 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1853 | hrtimer_cancel(&ap_poll_timer); |
1534c382 | 1854 | destroy_workqueue(ap_work_queue); |
13e742ba | 1855 | tasklet_kill(&ap_tasklet); |
035da16f | 1856 | root_device_unregister(ap_root_device); |
1534c382 MS |
1857 | while ((dev = bus_find_device(&ap_bus_type, NULL, NULL, |
1858 | __ap_match_all))) | |
1859 | { | |
1860 | device_unregister(dev); | |
1861 | put_device(dev); | |
1862 | } | |
1863 | for (i = 0; ap_bus_attrs[i]; i++) | |
1864 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1865 | bus_unregister(&ap_bus_type); | |
85eca850 | 1866 | unregister_reset_call(&ap_reset_call); |
cb17a636 FB |
1867 | if (ap_using_interrupts()) { |
1868 | s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); | |
1869 | isc_unregister(AP_ISC); | |
1870 | } | |
1534c382 MS |
1871 | } |
1872 | ||
1534c382 MS |
1873 | module_init(ap_module_init); |
1874 | module_exit(ap_module_exit); |