Commit | Line | Data |
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1534c382 | 1 | /* |
75014550 | 2 | * Copyright IBM Corp. 2006, 2012 |
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> | |
83e9d5d2 | 40 | #include <linux/suspend.h> |
85eca850 | 41 | #include <asm/reset.h> |
cb17a636 | 42 | #include <asm/airq.h> |
60063497 | 43 | #include <linux/atomic.h> |
cb17a636 | 44 | #include <asm/isc.h> |
fe137230 FB |
45 | #include <linux/hrtimer.h> |
46 | #include <linux/ktime.h> | |
a0616cde | 47 | #include <asm/facility.h> |
5d26a105 | 48 | #include <linux/crypto.h> |
1534c382 MS |
49 | |
50 | #include "ap_bus.h" | |
51 | ||
1749a81d | 52 | /* |
1534c382 MS |
53 | * Module description. |
54 | */ | |
55 | MODULE_AUTHOR("IBM Corporation"); | |
75014550 HD |
56 | MODULE_DESCRIPTION("Adjunct Processor Bus driver, " \ |
57 | "Copyright IBM Corp. 2006, 2012"); | |
1534c382 | 58 | MODULE_LICENSE("GPL"); |
5d26a105 | 59 | MODULE_ALIAS_CRYPTO("z90crypt"); |
1534c382 | 60 | |
1749a81d | 61 | /* |
1534c382 MS |
62 | * Module parameter |
63 | */ | |
64 | int ap_domain_index = -1; /* Adjunct Processor Domain Index */ | |
c1a42f49 | 65 | module_param_named(domain, ap_domain_index, int, S_IRUSR|S_IRGRP); |
1534c382 MS |
66 | MODULE_PARM_DESC(domain, "domain index for ap devices"); |
67 | EXPORT_SYMBOL(ap_domain_index); | |
68 | ||
b90b34c6 | 69 | static int ap_thread_flag = 0; |
c1a42f49 | 70 | module_param_named(poll_thread, ap_thread_flag, int, S_IRUSR|S_IRGRP); |
b90b34c6 | 71 | MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); |
1534c382 MS |
72 | |
73 | static struct device *ap_root_device = NULL; | |
75014550 | 74 | static struct ap_config_info *ap_configuration; |
43c207e6 | 75 | static DEFINE_SPINLOCK(ap_device_list_lock); |
cf352ce0 | 76 | static LIST_HEAD(ap_device_list); |
e387753c | 77 | static bool initialised; |
1534c382 | 78 | |
1749a81d | 79 | /* |
8139b89d | 80 | * Workqueue timer for bus rescan. |
1534c382 | 81 | */ |
1534c382 MS |
82 | static struct timer_list ap_config_timer; |
83 | static int ap_config_time = AP_CONFIG_TIME; | |
3f3007af | 84 | static void ap_scan_bus(struct work_struct *); |
8139b89d | 85 | static DECLARE_WORK(ap_scan_work, ap_scan_bus); |
1534c382 | 86 | |
1749a81d | 87 | /* |
cb17a636 | 88 | * Tasklet & timer for AP request polling and interrupts |
1534c382 | 89 | */ |
3f3007af MS |
90 | static void ap_tasklet_fn(unsigned long); |
91 | static DECLARE_TASKLET(ap_tasklet, ap_tasklet_fn, 0); | |
1534c382 MS |
92 | static atomic_t ap_poll_requests = ATOMIC_INIT(0); |
93 | static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); | |
94 | static struct task_struct *ap_poll_kthread = NULL; | |
95 | static DEFINE_MUTEX(ap_poll_thread_mutex); | |
93521314 | 96 | static DEFINE_SPINLOCK(ap_poll_timer_lock); |
fe137230 FB |
97 | static struct hrtimer ap_poll_timer; |
98 | /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. | |
99 | * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ | |
100 | static unsigned long long poll_timeout = 250000; | |
1534c382 | 101 | |
772f5472 FB |
102 | /* Suspend flag */ |
103 | static int ap_suspend_flag; | |
889875a1 MS |
104 | /* Maximum domain id */ |
105 | static int ap_max_domain_id; | |
5314af69 FB |
106 | /* Flag to check if domain was set through module parameter domain=. This is |
107 | * important when supsend and resume is done in a z/VM environment where the | |
108 | * domain might change. */ | |
109 | static int user_set_domain = 0; | |
772f5472 FB |
110 | static struct bus_type ap_bus_type; |
111 | ||
f4eae94f | 112 | /* Adapter interrupt definitions */ |
3f3007af MS |
113 | static void ap_interrupt_handler(struct airq_struct *airq); |
114 | ||
f4eae94f MS |
115 | static int ap_airq_flag; |
116 | ||
117 | static struct airq_struct ap_airq = { | |
118 | .handler = ap_interrupt_handler, | |
119 | .isc = AP_ISC, | |
120 | }; | |
121 | ||
cb17a636 FB |
122 | /** |
123 | * ap_using_interrupts() - Returns non-zero if interrupt support is | |
124 | * available. | |
125 | */ | |
126 | static inline int ap_using_interrupts(void) | |
127 | { | |
f4eae94f | 128 | return ap_airq_flag; |
cb17a636 FB |
129 | } |
130 | ||
1534c382 | 131 | /** |
1749a81d | 132 | * ap_intructions_available() - Test if AP instructions are available. |
1534c382 | 133 | * |
1749a81d | 134 | * Returns 0 if the AP instructions are installed. |
1534c382 MS |
135 | */ |
136 | static inline int ap_instructions_available(void) | |
137 | { | |
138 | register unsigned long reg0 asm ("0") = AP_MKQID(0,0); | |
139 | register unsigned long reg1 asm ("1") = -ENODEV; | |
140 | register unsigned long reg2 asm ("2") = 0UL; | |
141 | ||
142 | asm volatile( | |
143 | " .long 0xb2af0000\n" /* PQAP(TAPQ) */ | |
144 | "0: la %1,0\n" | |
145 | "1:\n" | |
146 | EX_TABLE(0b, 1b) | |
147 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" ); | |
148 | return reg1; | |
149 | } | |
150 | ||
cb17a636 FB |
151 | /** |
152 | * ap_interrupts_available(): Test if AP interrupts are available. | |
153 | * | |
154 | * Returns 1 if AP interrupts are available. | |
155 | */ | |
156 | static int ap_interrupts_available(void) | |
157 | { | |
86cd741b | 158 | return test_facility(65); |
cb17a636 FB |
159 | } |
160 | ||
75014550 HD |
161 | /** |
162 | * ap_configuration_available(): Test if AP configuration | |
163 | * information is available. | |
164 | * | |
165 | * Returns 1 if AP configuration information is available. | |
166 | */ | |
167 | static int ap_configuration_available(void) | |
168 | { | |
86cd741b | 169 | return test_facility(12); |
75014550 HD |
170 | } |
171 | ||
11d37673 HC |
172 | static inline struct ap_queue_status |
173 | __pqap_tapq(ap_qid_t qid, unsigned long *info) | |
174 | { | |
175 | register unsigned long reg0 asm ("0") = qid; | |
176 | register struct ap_queue_status reg1 asm ("1"); | |
177 | register unsigned long reg2 asm ("2") = 0UL; | |
178 | ||
179 | asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */ | |
180 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
181 | *info = reg2; | |
182 | return reg1; | |
183 | } | |
184 | ||
1534c382 | 185 | /** |
1749a81d FB |
186 | * ap_test_queue(): Test adjunct processor queue. |
187 | * @qid: The AP queue number | |
6acbe21f | 188 | * @info: Pointer to queue descriptor |
1534c382 | 189 | * |
1749a81d | 190 | * Returns AP queue status structure. |
1534c382 MS |
191 | */ |
192 | static inline struct ap_queue_status | |
6acbe21f | 193 | ap_test_queue(ap_qid_t qid, unsigned long *info) |
1534c382 | 194 | { |
11d37673 HC |
195 | struct ap_queue_status aqs; |
196 | unsigned long _info; | |
1534c382 | 197 | |
6acbe21f | 198 | if (test_facility(15)) |
11d37673 HC |
199 | qid |= 1UL << 23; /* set APFT T bit*/ |
200 | aqs = __pqap_tapq(qid, &_info); | |
6acbe21f | 201 | if (info) |
11d37673 HC |
202 | *info = _info; |
203 | return aqs; | |
1534c382 MS |
204 | } |
205 | ||
206 | /** | |
1749a81d FB |
207 | * ap_reset_queue(): Reset adjunct processor queue. |
208 | * @qid: The AP queue number | |
1534c382 | 209 | * |
1749a81d | 210 | * Returns AP queue status structure. |
1534c382 MS |
211 | */ |
212 | static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) | |
213 | { | |
214 | register unsigned long reg0 asm ("0") = qid | 0x01000000UL; | |
215 | register struct ap_queue_status reg1 asm ("1"); | |
216 | register unsigned long reg2 asm ("2") = 0UL; | |
217 | ||
218 | asm volatile( | |
219 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
220 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
221 | return reg1; | |
222 | } | |
223 | ||
cb17a636 FB |
224 | /** |
225 | * ap_queue_interruption_control(): Enable interruption for a specific AP. | |
226 | * @qid: The AP queue number | |
227 | * @ind: The notification indicator byte | |
228 | * | |
229 | * Returns AP queue status. | |
230 | */ | |
231 | static inline struct ap_queue_status | |
232 | ap_queue_interruption_control(ap_qid_t qid, void *ind) | |
233 | { | |
234 | register unsigned long reg0 asm ("0") = qid | 0x03000000UL; | |
235 | register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC; | |
236 | register struct ap_queue_status reg1_out asm ("1"); | |
237 | register void *reg2 asm ("2") = ind; | |
238 | asm volatile( | |
a7475afd | 239 | ".long 0xb2af0000" /* PQAP(AQIC) */ |
cb17a636 FB |
240 | : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) |
241 | : | |
242 | : "cc" ); | |
243 | return reg1_out; | |
244 | } | |
cb17a636 | 245 | |
889875a1 MS |
246 | /** |
247 | * ap_query_configuration(): Get AP configuration data | |
248 | * | |
249 | * Returns 0 on success, or -EOPNOTSUPP. | |
250 | */ | |
11d37673 | 251 | static inline int __ap_query_configuration(void) |
75014550 HD |
252 | { |
253 | register unsigned long reg0 asm ("0") = 0x04000000UL; | |
254 | register unsigned long reg1 asm ("1") = -EINVAL; | |
889875a1 | 255 | register void *reg2 asm ("2") = (void *) ap_configuration; |
75014550 HD |
256 | |
257 | asm volatile( | |
258 | ".long 0xb2af0000\n" /* PQAP(QCI) */ | |
259 | "0: la %1,0\n" | |
260 | "1:\n" | |
261 | EX_TABLE(0b, 1b) | |
262 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) | |
263 | : | |
264 | : "cc"); | |
265 | ||
266 | return reg1; | |
267 | } | |
75014550 | 268 | |
11d37673 HC |
269 | static inline int ap_query_configuration(void) |
270 | { | |
271 | if (!ap_configuration) | |
272 | return -EOPNOTSUPP; | |
273 | return __ap_query_configuration(); | |
274 | } | |
275 | ||
889875a1 MS |
276 | /** |
277 | * ap_init_configuration(): Allocate and query configuration array. | |
278 | */ | |
279 | static void ap_init_configuration(void) | |
280 | { | |
281 | if (!ap_configuration_available()) | |
282 | return; | |
283 | ||
284 | ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL); | |
285 | if (!ap_configuration) | |
286 | return; | |
287 | if (ap_query_configuration() != 0) { | |
288 | kfree(ap_configuration); | |
289 | ap_configuration = NULL; | |
290 | return; | |
291 | } | |
292 | } | |
293 | ||
294 | /* | |
295 | * ap_test_config(): helper function to extract the nrth bit | |
296 | * within the unsigned int array field. | |
297 | */ | |
298 | static inline int ap_test_config(unsigned int *field, unsigned int nr) | |
299 | { | |
300 | return ap_test_bit((field + (nr >> 5)), (nr & 0x1f)); | |
301 | } | |
302 | ||
303 | /* | |
304 | * ap_test_config_card_id(): Test, whether an AP card ID is configured. | |
305 | * @id AP card ID | |
306 | * | |
307 | * Returns 0 if the card is not configured | |
308 | * 1 if the card is configured or | |
309 | * if the configuration information is not available | |
310 | */ | |
311 | static inline int ap_test_config_card_id(unsigned int id) | |
312 | { | |
313 | if (!ap_configuration) /* QCI not supported */ | |
314 | return 1; | |
315 | return ap_test_config(ap_configuration->apm, id); | |
316 | } | |
317 | ||
318 | /* | |
319 | * ap_test_config_domain(): Test, whether an AP usage domain is configured. | |
320 | * @domain AP usage domain ID | |
321 | * | |
322 | * Returns 0 if the usage domain is not configured | |
323 | * 1 if the usage domain is configured or | |
324 | * if the configuration information is not available | |
325 | */ | |
326 | static inline int ap_test_config_domain(unsigned int domain) | |
327 | { | |
328 | if (!ap_configuration) /* QCI not supported */ | |
329 | return domain < 16; | |
330 | return ap_test_config(ap_configuration->aqm, domain); | |
331 | } | |
332 | ||
cb17a636 FB |
333 | /** |
334 | * ap_queue_enable_interruption(): Enable interruption on an AP. | |
335 | * @qid: The AP queue number | |
336 | * @ind: the notification indicator byte | |
337 | * | |
338 | * Enables interruption on AP queue via ap_queue_interruption_control(). Based | |
339 | * on the return value it waits a while and tests the AP queue if interrupts | |
340 | * have been switched on using ap_test_queue(). | |
341 | */ | |
c50a160c | 342 | static int ap_queue_enable_interruption(struct ap_device *ap_dev, void *ind) |
cb17a636 | 343 | { |
cb17a636 | 344 | struct ap_queue_status status; |
cb17a636 | 345 | |
c50a160c IT |
346 | status = ap_queue_interruption_control(ap_dev->qid, ind); |
347 | switch (status.response_code) { | |
348 | case AP_RESPONSE_NORMAL: | |
349 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
350 | return 0; | |
351 | case AP_RESPONSE_Q_NOT_AVAIL: | |
352 | case AP_RESPONSE_DECONFIGURED: | |
353 | case AP_RESPONSE_CHECKSTOPPED: | |
354 | case AP_RESPONSE_INVALID_ADDRESS: | |
3f3007af MS |
355 | pr_err("Registering adapter interrupts for AP %d failed\n", |
356 | AP_QID_DEVICE(ap_dev->qid)); | |
357 | return -EOPNOTSUPP; | |
c50a160c IT |
358 | case AP_RESPONSE_RESET_IN_PROGRESS: |
359 | case AP_RESPONSE_BUSY: | |
360 | default: | |
361 | return -EBUSY; | |
cb17a636 | 362 | } |
cb17a636 FB |
363 | } |
364 | ||
11d37673 HC |
365 | static inline struct ap_queue_status |
366 | __nqap(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
367 | { | |
368 | typedef struct { char _[length]; } msgblock; | |
369 | register unsigned long reg0 asm ("0") = qid | 0x40000000UL; | |
370 | register struct ap_queue_status reg1 asm ("1"); | |
371 | register unsigned long reg2 asm ("2") = (unsigned long) msg; | |
372 | register unsigned long reg3 asm ("3") = (unsigned long) length; | |
373 | register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32); | |
374 | register unsigned long reg5 asm ("5") = psmid & 0xffffffff; | |
375 | ||
376 | asm volatile ( | |
377 | "0: .long 0xb2ad0042\n" /* NQAP */ | |
378 | " brc 2,0b" | |
379 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) | |
380 | : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) | |
381 | : "cc"); | |
382 | return reg1; | |
383 | } | |
384 | ||
1534c382 | 385 | /** |
1749a81d FB |
386 | * __ap_send(): Send message to adjunct processor queue. |
387 | * @qid: The AP queue number | |
388 | * @psmid: The program supplied message identifier | |
389 | * @msg: The message text | |
390 | * @length: The message length | |
a6a5d73a | 391 | * @special: Special Bit |
1534c382 | 392 | * |
1749a81d | 393 | * Returns AP queue status structure. |
1534c382 | 394 | * Condition code 1 on NQAP can't happen because the L bit is 1. |
1534c382 MS |
395 | * Condition code 2 on NQAP also means the send is incomplete, |
396 | * because a segment boundary was reached. The NQAP is repeated. | |
397 | */ | |
398 | static inline struct ap_queue_status | |
a6a5d73a FB |
399 | __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length, |
400 | unsigned int special) | |
1534c382 | 401 | { |
a6a5d73a | 402 | if (special == 1) |
11d37673 HC |
403 | qid |= 0x400000UL; |
404 | return __nqap(qid, psmid, msg, length); | |
1534c382 MS |
405 | } |
406 | ||
407 | int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
408 | { | |
409 | struct ap_queue_status status; | |
410 | ||
a6a5d73a | 411 | status = __ap_send(qid, psmid, msg, length, 0); |
1534c382 MS |
412 | switch (status.response_code) { |
413 | case AP_RESPONSE_NORMAL: | |
414 | return 0; | |
415 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 416 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 | 417 | return -EBUSY; |
a6a5d73a FB |
418 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
419 | return -EINVAL; | |
1534c382 MS |
420 | default: /* Device is gone. */ |
421 | return -ENODEV; | |
422 | } | |
423 | } | |
424 | EXPORT_SYMBOL(ap_send); | |
425 | ||
1749a81d FB |
426 | /** |
427 | * __ap_recv(): Receive message from adjunct processor queue. | |
428 | * @qid: The AP queue number | |
429 | * @psmid: Pointer to program supplied message identifier | |
430 | * @msg: The message text | |
431 | * @length: The message length | |
1534c382 | 432 | * |
1749a81d | 433 | * Returns AP queue status structure. |
1534c382 MS |
434 | * Condition code 1 on DQAP means the receive has taken place |
435 | * but only partially. The response is incomplete, hence the | |
436 | * DQAP is repeated. | |
1534c382 MS |
437 | * Condition code 2 on DQAP also means the receive is incomplete, |
438 | * this time because a segment boundary was reached. Again, the | |
439 | * DQAP is repeated. | |
1534c382 MS |
440 | * Note that gpr2 is used by the DQAP instruction to keep track of |
441 | * any 'residual' length, in case the instruction gets interrupted. | |
442 | * Hence it gets zeroed before the instruction. | |
443 | */ | |
444 | static inline struct ap_queue_status | |
445 | __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
446 | { | |
447 | typedef struct { char _[length]; } msgblock; | |
448 | register unsigned long reg0 asm("0") = qid | 0x80000000UL; | |
449 | register struct ap_queue_status reg1 asm ("1"); | |
450 | register unsigned long reg2 asm("2") = 0UL; | |
451 | register unsigned long reg4 asm("4") = (unsigned long) msg; | |
452 | register unsigned long reg5 asm("5") = (unsigned long) length; | |
453 | register unsigned long reg6 asm("6") = 0UL; | |
454 | register unsigned long reg7 asm("7") = 0UL; | |
455 | ||
456 | ||
457 | asm volatile( | |
a7475afd | 458 | "0: .long 0xb2ae0064\n" /* DQAP */ |
1534c382 MS |
459 | " brc 6,0b\n" |
460 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), | |
461 | "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), | |
462 | "=m" (*(msgblock *) msg) : : "cc" ); | |
463 | *psmid = (((unsigned long long) reg6) << 32) + reg7; | |
464 | return reg1; | |
465 | } | |
466 | ||
467 | int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
468 | { | |
469 | struct ap_queue_status status; | |
470 | ||
d6d86c57 IT |
471 | if (msg == NULL) |
472 | return -EINVAL; | |
1534c382 MS |
473 | status = __ap_recv(qid, psmid, msg, length); |
474 | switch (status.response_code) { | |
475 | case AP_RESPONSE_NORMAL: | |
476 | return 0; | |
477 | case AP_RESPONSE_NO_PENDING_REPLY: | |
478 | if (status.queue_empty) | |
479 | return -ENOENT; | |
480 | return -EBUSY; | |
af512ed0 RW |
481 | case AP_RESPONSE_RESET_IN_PROGRESS: |
482 | return -EBUSY; | |
1534c382 MS |
483 | default: |
484 | return -ENODEV; | |
485 | } | |
486 | } | |
487 | EXPORT_SYMBOL(ap_recv); | |
488 | ||
489 | /** | |
1749a81d FB |
490 | * ap_query_queue(): Check if an AP queue is available. |
491 | * @qid: The AP queue number | |
492 | * @queue_depth: Pointer to queue depth value | |
493 | * @device_type: Pointer to device type value | |
6acbe21f | 494 | * @facilities: Pointer to facility indicator |
1534c382 | 495 | */ |
6acbe21f MS |
496 | static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type, |
497 | unsigned int *facilities) | |
1534c382 MS |
498 | { |
499 | struct ap_queue_status status; | |
6acbe21f | 500 | unsigned long info; |
889875a1 MS |
501 | int nd; |
502 | ||
503 | if (!ap_test_config_card_id(AP_QID_DEVICE(qid))) | |
504 | return -ENODEV; | |
1534c382 | 505 | |
6acbe21f | 506 | status = ap_test_queue(qid, &info); |
c50a160c IT |
507 | switch (status.response_code) { |
508 | case AP_RESPONSE_NORMAL: | |
6acbe21f MS |
509 | *queue_depth = (int)(info & 0xff); |
510 | *device_type = (int)((info >> 24) & 0xff); | |
511 | *facilities = (unsigned int)(info >> 32); | |
889875a1 MS |
512 | /* Update maximum domain id */ |
513 | nd = (info >> 16) & 0xff; | |
514 | if ((info & (1UL << 57)) && nd > 0) | |
515 | ap_max_domain_id = nd; | |
c50a160c IT |
516 | return 0; |
517 | case AP_RESPONSE_Q_NOT_AVAIL: | |
518 | case AP_RESPONSE_DECONFIGURED: | |
519 | case AP_RESPONSE_CHECKSTOPPED: | |
520 | case AP_RESPONSE_INVALID_ADDRESS: | |
521 | return -ENODEV; | |
522 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
523 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
524 | case AP_RESPONSE_BUSY: | |
525 | return -EBUSY; | |
526 | default: | |
527 | BUG(); | |
1534c382 | 528 | } |
1534c382 MS |
529 | } |
530 | ||
3f3007af MS |
531 | /* State machine definitions and helpers */ |
532 | ||
533 | static void ap_sm_wait(enum ap_wait wait) | |
534 | { | |
535 | ktime_t hr_time; | |
536 | ||
537 | switch (wait) { | |
538 | case AP_WAIT_AGAIN: | |
539 | case AP_WAIT_INTERRUPT: | |
540 | if (ap_using_interrupts()) | |
541 | break; | |
542 | if (ap_poll_kthread) { | |
543 | wake_up(&ap_poll_wait); | |
544 | break; | |
545 | } | |
546 | /* Fall through */ | |
547 | case AP_WAIT_TIMEOUT: | |
548 | spin_lock_bh(&ap_poll_timer_lock); | |
549 | if (!hrtimer_is_queued(&ap_poll_timer)) { | |
550 | hr_time = ktime_set(0, poll_timeout); | |
551 | hrtimer_forward_now(&ap_poll_timer, hr_time); | |
552 | hrtimer_restart(&ap_poll_timer); | |
553 | } | |
554 | spin_unlock_bh(&ap_poll_timer_lock); | |
555 | break; | |
556 | case AP_WAIT_NONE: | |
557 | default: | |
558 | break; | |
559 | } | |
560 | } | |
561 | ||
562 | static enum ap_wait ap_sm_nop(struct ap_device *ap_dev) | |
563 | { | |
564 | return AP_WAIT_NONE; | |
565 | } | |
566 | ||
567 | /** | |
568 | * ap_sm_recv(): Receive pending reply messages from an AP device but do | |
569 | * not change the state of the device. | |
570 | * @ap_dev: pointer to the AP device | |
571 | * | |
572 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
573 | */ | |
574 | static struct ap_queue_status ap_sm_recv(struct ap_device *ap_dev) | |
575 | { | |
576 | struct ap_queue_status status; | |
577 | struct ap_message *ap_msg; | |
578 | ||
579 | status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid, | |
580 | ap_dev->reply->message, ap_dev->reply->length); | |
581 | switch (status.response_code) { | |
582 | case AP_RESPONSE_NORMAL: | |
583 | atomic_dec(&ap_poll_requests); | |
584 | ap_dev->queue_count--; | |
585 | if (ap_dev->queue_count > 0) | |
586 | mod_timer(&ap_dev->timeout, | |
587 | jiffies + ap_dev->drv->request_timeout); | |
588 | list_for_each_entry(ap_msg, &ap_dev->pendingq, list) { | |
589 | if (ap_msg->psmid != ap_dev->reply->psmid) | |
590 | continue; | |
591 | list_del_init(&ap_msg->list); | |
592 | ap_dev->pendingq_count--; | |
593 | ap_msg->receive(ap_dev, ap_msg, ap_dev->reply); | |
594 | break; | |
595 | } | |
596 | case AP_RESPONSE_NO_PENDING_REPLY: | |
597 | if (!status.queue_empty || ap_dev->queue_count <= 0) | |
598 | break; | |
599 | /* The card shouldn't forget requests but who knows. */ | |
600 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
601 | ap_dev->queue_count = 0; | |
602 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
603 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
604 | ap_dev->pendingq_count = 0; | |
605 | break; | |
606 | default: | |
607 | break; | |
608 | } | |
609 | return status; | |
610 | } | |
611 | ||
612 | /** | |
613 | * ap_sm_read(): Receive pending reply messages from an AP device. | |
614 | * @ap_dev: pointer to the AP device | |
615 | * | |
616 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
617 | */ | |
618 | static enum ap_wait ap_sm_read(struct ap_device *ap_dev) | |
619 | { | |
620 | struct ap_queue_status status; | |
621 | ||
d6d86c57 IT |
622 | if (!ap_dev->reply) |
623 | return AP_WAIT_NONE; | |
3f3007af MS |
624 | status = ap_sm_recv(ap_dev); |
625 | switch (status.response_code) { | |
626 | case AP_RESPONSE_NORMAL: | |
2bc53b80 IT |
627 | if (ap_dev->queue_count > 0) { |
628 | ap_dev->state = AP_STATE_WORKING; | |
3f3007af | 629 | return AP_WAIT_AGAIN; |
2bc53b80 | 630 | } |
3f3007af MS |
631 | ap_dev->state = AP_STATE_IDLE; |
632 | return AP_WAIT_NONE; | |
633 | case AP_RESPONSE_NO_PENDING_REPLY: | |
634 | if (ap_dev->queue_count > 0) | |
635 | return AP_WAIT_INTERRUPT; | |
636 | ap_dev->state = AP_STATE_IDLE; | |
637 | return AP_WAIT_NONE; | |
638 | default: | |
639 | ap_dev->state = AP_STATE_BORKED; | |
640 | return AP_WAIT_NONE; | |
641 | } | |
642 | } | |
643 | ||
d6d86c57 IT |
644 | /** |
645 | * ap_sm_suspend_read(): Receive pending reply messages from an AP device | |
646 | * without changing the device state in between. In suspend mode we don't | |
647 | * allow sending new requests, therefore just fetch pending replies. | |
648 | * @ap_dev: pointer to the AP device | |
649 | * | |
650 | * Returns AP_WAIT_NONE or AP_WAIT_AGAIN | |
651 | */ | |
652 | static enum ap_wait ap_sm_suspend_read(struct ap_device *ap_dev) | |
653 | { | |
654 | struct ap_queue_status status; | |
655 | ||
656 | if (!ap_dev->reply) | |
657 | return AP_WAIT_NONE; | |
658 | status = ap_sm_recv(ap_dev); | |
659 | switch (status.response_code) { | |
660 | case AP_RESPONSE_NORMAL: | |
661 | if (ap_dev->queue_count > 0) | |
662 | return AP_WAIT_AGAIN; | |
663 | /* fall through */ | |
664 | default: | |
665 | return AP_WAIT_NONE; | |
666 | } | |
667 | } | |
668 | ||
3f3007af MS |
669 | /** |
670 | * ap_sm_write(): Send messages from the request queue to an AP device. | |
671 | * @ap_dev: pointer to the AP device | |
672 | * | |
673 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
674 | */ | |
675 | static enum ap_wait ap_sm_write(struct ap_device *ap_dev) | |
676 | { | |
677 | struct ap_queue_status status; | |
678 | struct ap_message *ap_msg; | |
679 | ||
680 | if (ap_dev->requestq_count <= 0) | |
681 | return AP_WAIT_NONE; | |
682 | /* Start the next request on the queue. */ | |
683 | ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list); | |
684 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
685 | ap_msg->message, ap_msg->length, ap_msg->special); | |
686 | switch (status.response_code) { | |
687 | case AP_RESPONSE_NORMAL: | |
688 | atomic_inc(&ap_poll_requests); | |
689 | ap_dev->queue_count++; | |
690 | if (ap_dev->queue_count == 1) | |
691 | mod_timer(&ap_dev->timeout, | |
692 | jiffies + ap_dev->drv->request_timeout); | |
693 | list_move_tail(&ap_msg->list, &ap_dev->pendingq); | |
694 | ap_dev->requestq_count--; | |
695 | ap_dev->pendingq_count++; | |
696 | if (ap_dev->queue_count < ap_dev->queue_depth) { | |
697 | ap_dev->state = AP_STATE_WORKING; | |
698 | return AP_WAIT_AGAIN; | |
699 | } | |
700 | /* fall through */ | |
701 | case AP_RESPONSE_Q_FULL: | |
702 | ap_dev->state = AP_STATE_QUEUE_FULL; | |
703 | return AP_WAIT_INTERRUPT; | |
704 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
705 | ap_dev->state = AP_STATE_RESET_WAIT; | |
706 | return AP_WAIT_TIMEOUT; | |
707 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
708 | case AP_RESPONSE_REQ_FAC_NOT_INST: | |
709 | list_del_init(&ap_msg->list); | |
710 | ap_dev->requestq_count--; | |
711 | ap_msg->rc = -EINVAL; | |
712 | ap_msg->receive(ap_dev, ap_msg, NULL); | |
713 | return AP_WAIT_AGAIN; | |
714 | default: | |
715 | ap_dev->state = AP_STATE_BORKED; | |
716 | return AP_WAIT_NONE; | |
717 | } | |
718 | } | |
719 | ||
1534c382 | 720 | /** |
3f3007af MS |
721 | * ap_sm_read_write(): Send and receive messages to/from an AP device. |
722 | * @ap_dev: pointer to the AP device | |
723 | * | |
724 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
725 | */ | |
726 | static enum ap_wait ap_sm_read_write(struct ap_device *ap_dev) | |
727 | { | |
728 | return min(ap_sm_read(ap_dev), ap_sm_write(ap_dev)); | |
729 | } | |
730 | ||
731 | /** | |
732 | * ap_sm_reset(): Reset an AP queue. | |
1749a81d FB |
733 | * @qid: The AP queue number |
734 | * | |
c50a160c | 735 | * Submit the Reset command to an AP queue. |
1534c382 | 736 | */ |
3f3007af | 737 | static enum ap_wait ap_sm_reset(struct ap_device *ap_dev) |
1534c382 MS |
738 | { |
739 | struct ap_queue_status status; | |
1534c382 | 740 | |
c50a160c IT |
741 | status = ap_reset_queue(ap_dev->qid); |
742 | switch (status.response_code) { | |
743 | case AP_RESPONSE_NORMAL: | |
c50a160c | 744 | case AP_RESPONSE_RESET_IN_PROGRESS: |
3f3007af MS |
745 | ap_dev->state = AP_STATE_RESET_WAIT; |
746 | ap_dev->interrupt = AP_INTR_DISABLED; | |
747 | return AP_WAIT_TIMEOUT; | |
c50a160c | 748 | case AP_RESPONSE_BUSY: |
3f3007af | 749 | return AP_WAIT_TIMEOUT; |
c50a160c IT |
750 | case AP_RESPONSE_Q_NOT_AVAIL: |
751 | case AP_RESPONSE_DECONFIGURED: | |
752 | case AP_RESPONSE_CHECKSTOPPED: | |
753 | default: | |
3f3007af MS |
754 | ap_dev->state = AP_STATE_BORKED; |
755 | return AP_WAIT_NONE; | |
cb17a636 | 756 | } |
1534c382 MS |
757 | } |
758 | ||
af512ed0 | 759 | /** |
3f3007af MS |
760 | * ap_sm_reset_wait(): Test queue for completion of the reset operation |
761 | * @ap_dev: pointer to the AP device | |
1749a81d | 762 | * |
3f3007af | 763 | * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0. |
af512ed0 | 764 | */ |
3f3007af | 765 | static enum ap_wait ap_sm_reset_wait(struct ap_device *ap_dev) |
af512ed0 | 766 | { |
3f3007af MS |
767 | struct ap_queue_status status; |
768 | unsigned long info; | |
af512ed0 | 769 | |
d6d86c57 | 770 | if (ap_dev->queue_count > 0 && ap_dev->reply) |
3f3007af MS |
771 | /* Try to read a completed message and get the status */ |
772 | status = ap_sm_recv(ap_dev); | |
773 | else | |
774 | /* Get the status with TAPQ */ | |
775 | status = ap_test_queue(ap_dev->qid, &info); | |
776 | ||
777 | switch (status.response_code) { | |
778 | case AP_RESPONSE_NORMAL: | |
779 | if (ap_using_interrupts() && | |
780 | ap_queue_enable_interruption(ap_dev, | |
781 | ap_airq.lsi_ptr) == 0) | |
782 | ap_dev->state = AP_STATE_SETIRQ_WAIT; | |
783 | else | |
784 | ap_dev->state = (ap_dev->queue_count > 0) ? | |
785 | AP_STATE_WORKING : AP_STATE_IDLE; | |
786 | return AP_WAIT_AGAIN; | |
787 | case AP_RESPONSE_BUSY: | |
788 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
789 | return AP_WAIT_TIMEOUT; | |
790 | case AP_RESPONSE_Q_NOT_AVAIL: | |
791 | case AP_RESPONSE_DECONFIGURED: | |
792 | case AP_RESPONSE_CHECKSTOPPED: | |
793 | default: | |
794 | ap_dev->state = AP_STATE_BORKED; | |
795 | return AP_WAIT_NONE; | |
af512ed0 RW |
796 | } |
797 | } | |
798 | ||
799 | /** | |
3f3007af MS |
800 | * ap_sm_setirq_wait(): Test queue for completion of the irq enablement |
801 | * @ap_dev: pointer to the AP device | |
1749a81d | 802 | * |
3f3007af | 803 | * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0. |
af512ed0 | 804 | */ |
3f3007af | 805 | static enum ap_wait ap_sm_setirq_wait(struct ap_device *ap_dev) |
af512ed0 | 806 | { |
3f3007af MS |
807 | struct ap_queue_status status; |
808 | unsigned long info; | |
af512ed0 | 809 | |
d6d86c57 | 810 | if (ap_dev->queue_count > 0 && ap_dev->reply) |
3f3007af MS |
811 | /* Try to read a completed message and get the status */ |
812 | status = ap_sm_recv(ap_dev); | |
af512ed0 | 813 | else |
3f3007af MS |
814 | /* Get the status with TAPQ */ |
815 | status = ap_test_queue(ap_dev->qid, &info); | |
816 | ||
817 | if (status.int_enabled == 1) { | |
818 | /* Irqs are now enabled */ | |
819 | ap_dev->interrupt = AP_INTR_ENABLED; | |
820 | ap_dev->state = (ap_dev->queue_count > 0) ? | |
821 | AP_STATE_WORKING : AP_STATE_IDLE; | |
822 | } | |
823 | ||
824 | switch (status.response_code) { | |
825 | case AP_RESPONSE_NORMAL: | |
826 | if (ap_dev->queue_count > 0) | |
827 | return AP_WAIT_AGAIN; | |
828 | /* fallthrough */ | |
829 | case AP_RESPONSE_NO_PENDING_REPLY: | |
830 | return AP_WAIT_TIMEOUT; | |
831 | default: | |
832 | ap_dev->state = AP_STATE_BORKED; | |
833 | return AP_WAIT_NONE; | |
834 | } | |
835 | } | |
836 | ||
837 | /* | |
838 | * AP state machine jump table | |
839 | */ | |
f70a34c5 | 840 | static ap_func_t *ap_jumptable[NR_AP_STATES][NR_AP_EVENTS] = { |
3f3007af MS |
841 | [AP_STATE_RESET_START] = { |
842 | [AP_EVENT_POLL] = ap_sm_reset, | |
843 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
844 | }, | |
845 | [AP_STATE_RESET_WAIT] = { | |
846 | [AP_EVENT_POLL] = ap_sm_reset_wait, | |
847 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
848 | }, | |
849 | [AP_STATE_SETIRQ_WAIT] = { | |
850 | [AP_EVENT_POLL] = ap_sm_setirq_wait, | |
851 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
852 | }, | |
853 | [AP_STATE_IDLE] = { | |
854 | [AP_EVENT_POLL] = ap_sm_write, | |
855 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
856 | }, | |
857 | [AP_STATE_WORKING] = { | |
858 | [AP_EVENT_POLL] = ap_sm_read_write, | |
859 | [AP_EVENT_TIMEOUT] = ap_sm_reset, | |
860 | }, | |
861 | [AP_STATE_QUEUE_FULL] = { | |
862 | [AP_EVENT_POLL] = ap_sm_read, | |
863 | [AP_EVENT_TIMEOUT] = ap_sm_reset, | |
864 | }, | |
865 | [AP_STATE_SUSPEND_WAIT] = { | |
d6d86c57 | 866 | [AP_EVENT_POLL] = ap_sm_suspend_read, |
3f3007af MS |
867 | [AP_EVENT_TIMEOUT] = ap_sm_nop, |
868 | }, | |
869 | [AP_STATE_BORKED] = { | |
870 | [AP_EVENT_POLL] = ap_sm_nop, | |
871 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
872 | }, | |
873 | }; | |
874 | ||
875 | static inline enum ap_wait ap_sm_event(struct ap_device *ap_dev, | |
876 | enum ap_event event) | |
877 | { | |
878 | return ap_jumptable[ap_dev->state][event](ap_dev); | |
879 | } | |
880 | ||
881 | static inline enum ap_wait ap_sm_event_loop(struct ap_device *ap_dev, | |
882 | enum ap_event event) | |
883 | { | |
884 | enum ap_wait wait; | |
885 | ||
886 | while ((wait = ap_sm_event(ap_dev, event)) == AP_WAIT_AGAIN) | |
887 | ; | |
888 | return wait; | |
889 | } | |
890 | ||
891 | /** | |
892 | * ap_request_timeout(): Handling of request timeouts | |
893 | * @data: Holds the AP device. | |
894 | * | |
895 | * Handles request timeouts. | |
896 | */ | |
897 | static void ap_request_timeout(unsigned long data) | |
898 | { | |
899 | struct ap_device *ap_dev = (struct ap_device *) data; | |
900 | ||
901 | if (ap_suspend_flag) | |
902 | return; | |
903 | spin_lock_bh(&ap_dev->lock); | |
904 | ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_TIMEOUT)); | |
905 | spin_unlock_bh(&ap_dev->lock); | |
906 | } | |
907 | ||
908 | /** | |
909 | * ap_poll_timeout(): AP receive polling for finished AP requests. | |
910 | * @unused: Unused pointer. | |
911 | * | |
912 | * Schedules the AP tasklet using a high resolution timer. | |
913 | */ | |
914 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) | |
915 | { | |
916 | if (!ap_suspend_flag) | |
917 | tasklet_schedule(&ap_tasklet); | |
918 | return HRTIMER_NORESTART; | |
919 | } | |
920 | ||
921 | /** | |
922 | * ap_interrupt_handler() - Schedule ap_tasklet on interrupt | |
923 | * @airq: pointer to adapter interrupt descriptor | |
924 | */ | |
925 | static void ap_interrupt_handler(struct airq_struct *airq) | |
926 | { | |
927 | inc_irq_stat(IRQIO_APB); | |
928 | if (!ap_suspend_flag) | |
929 | tasklet_schedule(&ap_tasklet); | |
930 | } | |
931 | ||
932 | /** | |
933 | * ap_tasklet_fn(): Tasklet to poll all AP devices. | |
934 | * @dummy: Unused variable | |
935 | * | |
936 | * Poll all AP devices on the bus. | |
937 | */ | |
938 | static void ap_tasklet_fn(unsigned long dummy) | |
939 | { | |
940 | struct ap_device *ap_dev; | |
941 | enum ap_wait wait = AP_WAIT_NONE; | |
942 | ||
943 | /* Reset the indicator if interrupts are used. Thus new interrupts can | |
944 | * be received. Doing it in the beginning of the tasklet is therefor | |
945 | * important that no requests on any AP get lost. | |
946 | */ | |
947 | if (ap_using_interrupts()) | |
948 | xchg(ap_airq.lsi_ptr, 0); | |
949 | ||
950 | spin_lock(&ap_device_list_lock); | |
951 | list_for_each_entry(ap_dev, &ap_device_list, list) { | |
952 | spin_lock_bh(&ap_dev->lock); | |
953 | wait = min(wait, ap_sm_event_loop(ap_dev, AP_EVENT_POLL)); | |
954 | spin_unlock_bh(&ap_dev->lock); | |
955 | } | |
956 | spin_unlock(&ap_device_list_lock); | |
957 | ap_sm_wait(wait); | |
af512ed0 RW |
958 | } |
959 | ||
83e9d5d2 MS |
960 | /** |
961 | * ap_poll_thread(): Thread that polls for finished requests. | |
962 | * @data: Unused pointer | |
963 | * | |
964 | * AP bus poll thread. The purpose of this thread is to poll for | |
965 | * finished requests in a loop if there is a "free" cpu - that is | |
966 | * a cpu that doesn't have anything better to do. The polling stops | |
967 | * as soon as there is another task or if all messages have been | |
968 | * delivered. | |
969 | */ | |
970 | static int ap_poll_thread(void *data) | |
971 | { | |
972 | DECLARE_WAITQUEUE(wait, current); | |
83e9d5d2 MS |
973 | |
974 | set_user_nice(current, MAX_NICE); | |
975 | set_freezable(); | |
976 | while (!kthread_should_stop()) { | |
977 | add_wait_queue(&ap_poll_wait, &wait); | |
978 | set_current_state(TASK_INTERRUPTIBLE); | |
979 | if (ap_suspend_flag || | |
980 | atomic_read(&ap_poll_requests) <= 0) { | |
981 | schedule(); | |
982 | try_to_freeze(); | |
983 | } | |
984 | set_current_state(TASK_RUNNING); | |
985 | remove_wait_queue(&ap_poll_wait, &wait); | |
83e9d5d2 MS |
986 | if (need_resched()) { |
987 | schedule(); | |
988 | try_to_freeze(); | |
989 | continue; | |
990 | } | |
3f3007af | 991 | ap_tasklet_fn(0); |
83e9d5d2 MS |
992 | } while (!kthread_should_stop()); |
993 | return 0; | |
994 | } | |
995 | ||
996 | static int ap_poll_thread_start(void) | |
997 | { | |
998 | int rc; | |
999 | ||
1000 | if (ap_using_interrupts() || ap_poll_kthread) | |
1001 | return 0; | |
1002 | mutex_lock(&ap_poll_thread_mutex); | |
1003 | ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); | |
1004 | rc = PTR_RET(ap_poll_kthread); | |
1005 | if (rc) | |
1006 | ap_poll_kthread = NULL; | |
1007 | mutex_unlock(&ap_poll_thread_mutex); | |
1008 | return rc; | |
1009 | } | |
1010 | ||
1011 | static void ap_poll_thread_stop(void) | |
1012 | { | |
1013 | if (!ap_poll_kthread) | |
1014 | return; | |
1015 | mutex_lock(&ap_poll_thread_mutex); | |
1016 | kthread_stop(ap_poll_kthread); | |
1017 | ap_poll_kthread = NULL; | |
1018 | mutex_unlock(&ap_poll_thread_mutex); | |
1019 | } | |
1020 | ||
3f3007af MS |
1021 | /** |
1022 | * ap_queue_message(): Queue a request to an AP device. | |
1023 | * @ap_dev: The AP device to queue the message to | |
1024 | * @ap_msg: The message that is to be added | |
1025 | */ | |
1026 | void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1027 | { | |
1028 | /* For asynchronous message handling a valid receive-callback | |
1029 | * is required. */ | |
1030 | BUG_ON(!ap_msg->receive); | |
1031 | ||
1032 | spin_lock_bh(&ap_dev->lock); | |
1033 | /* Queue the message. */ | |
1034 | list_add_tail(&ap_msg->list, &ap_dev->requestq); | |
1035 | ap_dev->requestq_count++; | |
1036 | ap_dev->total_request_count++; | |
1037 | /* Send/receive as many request from the queue as possible. */ | |
1038 | ap_sm_wait(ap_sm_event_loop(ap_dev, AP_EVENT_POLL)); | |
1039 | spin_unlock_bh(&ap_dev->lock); | |
1040 | } | |
1041 | EXPORT_SYMBOL(ap_queue_message); | |
1042 | ||
1043 | /** | |
1044 | * ap_cancel_message(): Cancel a crypto request. | |
1045 | * @ap_dev: The AP device that has the message queued | |
1046 | * @ap_msg: The message that is to be removed | |
1047 | * | |
1048 | * Cancel a crypto request. This is done by removing the request | |
1049 | * from the device pending or request queue. Note that the | |
1050 | * request stays on the AP queue. When it finishes the message | |
1051 | * reply will be discarded because the psmid can't be found. | |
1052 | */ | |
1053 | void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1054 | { | |
1055 | struct ap_message *tmp; | |
1056 | ||
1057 | spin_lock_bh(&ap_dev->lock); | |
1058 | if (!list_empty(&ap_msg->list)) { | |
1059 | list_for_each_entry(tmp, &ap_dev->pendingq, list) | |
1060 | if (tmp->psmid == ap_msg->psmid) { | |
1061 | ap_dev->pendingq_count--; | |
1062 | goto found; | |
1063 | } | |
1064 | ap_dev->requestq_count--; | |
1065 | found: | |
1066 | list_del_init(&ap_msg->list); | |
1067 | } | |
1068 | spin_unlock_bh(&ap_dev->lock); | |
1069 | } | |
1070 | EXPORT_SYMBOL(ap_cancel_message); | |
1071 | ||
1749a81d | 1072 | /* |
1534c382 MS |
1073 | * AP device related attributes. |
1074 | */ | |
1075 | static ssize_t ap_hwtype_show(struct device *dev, | |
1076 | struct device_attribute *attr, char *buf) | |
1077 | { | |
1078 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1079 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); | |
1080 | } | |
1534c382 | 1081 | |
43c207e6 | 1082 | static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); |
42f4dd61 IT |
1083 | |
1084 | static ssize_t ap_raw_hwtype_show(struct device *dev, | |
1085 | struct device_attribute *attr, char *buf) | |
1086 | { | |
1087 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1088 | ||
1089 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->raw_hwtype); | |
1090 | } | |
1091 | ||
1092 | static DEVICE_ATTR(raw_hwtype, 0444, ap_raw_hwtype_show, NULL); | |
1093 | ||
1534c382 MS |
1094 | static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr, |
1095 | char *buf) | |
1096 | { | |
1097 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1098 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth); | |
1099 | } | |
1534c382 | 1100 | |
43c207e6 | 1101 | static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); |
1534c382 MS |
1102 | static ssize_t ap_request_count_show(struct device *dev, |
1103 | struct device_attribute *attr, | |
1104 | char *buf) | |
1105 | { | |
1106 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1107 | int rc; | |
1108 | ||
1109 | spin_lock_bh(&ap_dev->lock); | |
1110 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count); | |
1111 | spin_unlock_bh(&ap_dev->lock); | |
1112 | return rc; | |
1113 | } | |
1114 | ||
1115 | static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); | |
1116 | ||
b26bd941 HD |
1117 | static ssize_t ap_requestq_count_show(struct device *dev, |
1118 | struct device_attribute *attr, char *buf) | |
1119 | { | |
1120 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1121 | int rc; | |
1122 | ||
1123 | spin_lock_bh(&ap_dev->lock); | |
1124 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->requestq_count); | |
1125 | spin_unlock_bh(&ap_dev->lock); | |
1126 | return rc; | |
1127 | } | |
1128 | ||
1129 | static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL); | |
1130 | ||
1131 | static ssize_t ap_pendingq_count_show(struct device *dev, | |
1132 | struct device_attribute *attr, char *buf) | |
1133 | { | |
1134 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1135 | int rc; | |
1136 | ||
1137 | spin_lock_bh(&ap_dev->lock); | |
1138 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->pendingq_count); | |
1139 | spin_unlock_bh(&ap_dev->lock); | |
1140 | return rc; | |
1141 | } | |
1142 | ||
1143 | static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL); | |
1144 | ||
c50a160c IT |
1145 | static ssize_t ap_reset_show(struct device *dev, |
1146 | struct device_attribute *attr, char *buf) | |
1147 | { | |
1148 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1149 | int rc = 0; | |
1150 | ||
1151 | spin_lock_bh(&ap_dev->lock); | |
3f3007af MS |
1152 | switch (ap_dev->state) { |
1153 | case AP_STATE_RESET_START: | |
1154 | case AP_STATE_RESET_WAIT: | |
1155 | rc = snprintf(buf, PAGE_SIZE, "Reset in progress.\n"); | |
c50a160c | 1156 | break; |
3f3007af MS |
1157 | case AP_STATE_WORKING: |
1158 | case AP_STATE_QUEUE_FULL: | |
c50a160c IT |
1159 | rc = snprintf(buf, PAGE_SIZE, "Reset Timer armed.\n"); |
1160 | break; | |
c50a160c | 1161 | default: |
3f3007af | 1162 | rc = snprintf(buf, PAGE_SIZE, "No Reset Timer set.\n"); |
c50a160c IT |
1163 | } |
1164 | spin_unlock_bh(&ap_dev->lock); | |
1165 | return rc; | |
1166 | } | |
1167 | ||
1168 | static DEVICE_ATTR(reset, 0444, ap_reset_show, NULL); | |
1169 | ||
1170 | static ssize_t ap_interrupt_show(struct device *dev, | |
1171 | struct device_attribute *attr, char *buf) | |
1172 | { | |
1173 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1174 | int rc = 0; | |
1175 | ||
1176 | spin_lock_bh(&ap_dev->lock); | |
3f3007af | 1177 | if (ap_dev->state == AP_STATE_SETIRQ_WAIT) |
c50a160c | 1178 | rc = snprintf(buf, PAGE_SIZE, "Enable Interrupt pending.\n"); |
3f3007af MS |
1179 | else if (ap_dev->interrupt == AP_INTR_ENABLED) |
1180 | rc = snprintf(buf, PAGE_SIZE, "Interrupts enabled.\n"); | |
1181 | else | |
1182 | rc = snprintf(buf, PAGE_SIZE, "Interrupts disabled.\n"); | |
c50a160c IT |
1183 | spin_unlock_bh(&ap_dev->lock); |
1184 | return rc; | |
1185 | } | |
1186 | ||
1187 | static DEVICE_ATTR(interrupt, 0444, ap_interrupt_show, NULL); | |
1188 | ||
1534c382 MS |
1189 | static ssize_t ap_modalias_show(struct device *dev, |
1190 | struct device_attribute *attr, char *buf) | |
1191 | { | |
c50a160c | 1192 | return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type); |
1534c382 MS |
1193 | } |
1194 | ||
1195 | static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); | |
1196 | ||
b26bd941 HD |
1197 | static ssize_t ap_functions_show(struct device *dev, |
1198 | struct device_attribute *attr, char *buf) | |
1199 | { | |
1200 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1201 | return snprintf(buf, PAGE_SIZE, "0x%08X\n", ap_dev->functions); | |
1202 | } | |
1203 | ||
1204 | static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL); | |
1205 | ||
1534c382 MS |
1206 | static struct attribute *ap_dev_attrs[] = { |
1207 | &dev_attr_hwtype.attr, | |
42f4dd61 | 1208 | &dev_attr_raw_hwtype.attr, |
1534c382 MS |
1209 | &dev_attr_depth.attr, |
1210 | &dev_attr_request_count.attr, | |
b26bd941 HD |
1211 | &dev_attr_requestq_count.attr, |
1212 | &dev_attr_pendingq_count.attr, | |
c50a160c IT |
1213 | &dev_attr_reset.attr, |
1214 | &dev_attr_interrupt.attr, | |
1534c382 | 1215 | &dev_attr_modalias.attr, |
b26bd941 | 1216 | &dev_attr_ap_functions.attr, |
1534c382 MS |
1217 | NULL |
1218 | }; | |
1219 | static struct attribute_group ap_dev_attr_group = { | |
1220 | .attrs = ap_dev_attrs | |
1221 | }; | |
1222 | ||
1223 | /** | |
1749a81d FB |
1224 | * ap_bus_match() |
1225 | * @dev: Pointer to device | |
1226 | * @drv: Pointer to device_driver | |
1227 | * | |
1534c382 MS |
1228 | * AP bus driver registration/unregistration. |
1229 | */ | |
1230 | static int ap_bus_match(struct device *dev, struct device_driver *drv) | |
1231 | { | |
1232 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1233 | struct ap_driver *ap_drv = to_ap_drv(drv); | |
1234 | struct ap_device_id *id; | |
1235 | ||
1749a81d | 1236 | /* |
1534c382 MS |
1237 | * Compare device type of the device with the list of |
1238 | * supported types of the device_driver. | |
1239 | */ | |
1240 | for (id = ap_drv->ids; id->match_flags; id++) { | |
1241 | if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) && | |
1242 | (id->dev_type != ap_dev->device_type)) | |
1243 | continue; | |
1244 | return 1; | |
1245 | } | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | /** | |
1749a81d FB |
1250 | * ap_uevent(): Uevent function for AP devices. |
1251 | * @dev: Pointer to device | |
1252 | * @env: Pointer to kobj_uevent_env | |
1253 | * | |
1254 | * It sets up a single environment variable DEV_TYPE which contains the | |
1255 | * hardware device type. | |
1534c382 | 1256 | */ |
7eff2e7a | 1257 | static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) |
1534c382 MS |
1258 | { |
1259 | struct ap_device *ap_dev = to_ap_dev(dev); | |
7eff2e7a | 1260 | int retval = 0; |
1534c382 MS |
1261 | |
1262 | if (!ap_dev) | |
1263 | return -ENODEV; | |
1264 | ||
1265 | /* Set up DEV_TYPE environment variable. */ | |
7eff2e7a | 1266 | retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); |
bf62456e ER |
1267 | if (retval) |
1268 | return retval; | |
1269 | ||
66a4263b | 1270 | /* Add MODALIAS= */ |
7eff2e7a | 1271 | retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); |
bf62456e | 1272 | |
bf62456e | 1273 | return retval; |
1534c382 MS |
1274 | } |
1275 | ||
3e488c95 | 1276 | static int ap_dev_suspend(struct device *dev) |
772f5472 FB |
1277 | { |
1278 | struct ap_device *ap_dev = to_ap_dev(dev); | |
772f5472 | 1279 | |
772f5472 | 1280 | /* Poll on the device until all requests are finished. */ |
3f3007af MS |
1281 | spin_lock_bh(&ap_dev->lock); |
1282 | ap_dev->state = AP_STATE_SUSPEND_WAIT; | |
1283 | while (ap_sm_event(ap_dev, AP_EVENT_POLL) != AP_WAIT_NONE) | |
1284 | ; | |
1285 | ap_dev->state = AP_STATE_BORKED; | |
1286 | spin_unlock_bh(&ap_dev->lock); | |
83e9d5d2 MS |
1287 | return 0; |
1288 | } | |
5314af69 | 1289 | |
83e9d5d2 MS |
1290 | static void ap_bus_suspend(void) |
1291 | { | |
1292 | ap_suspend_flag = 1; | |
1293 | /* | |
1294 | * Disable scanning for devices, thus we do not want to scan | |
1295 | * for them after removing. | |
1296 | */ | |
8139b89d | 1297 | flush_work(&ap_scan_work); |
83e9d5d2 MS |
1298 | tasklet_disable(&ap_tasklet); |
1299 | } | |
1300 | ||
1301 | static int __ap_devices_unregister(struct device *dev, void *dummy) | |
1302 | { | |
1303 | device_unregister(dev); | |
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | static void ap_bus_resume(void) | |
772f5472 | 1308 | { |
f4eae94f | 1309 | int rc; |
772f5472 | 1310 | |
83e9d5d2 MS |
1311 | /* Unconditionally remove all AP devices */ |
1312 | bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_devices_unregister); | |
1313 | /* Reset thin interrupt setting */ | |
1314 | if (ap_interrupts_available() && !ap_using_interrupts()) { | |
1315 | rc = register_adapter_interrupt(&ap_airq); | |
1316 | ap_airq_flag = (rc == 0); | |
5314af69 | 1317 | } |
83e9d5d2 MS |
1318 | if (!ap_interrupts_available() && ap_using_interrupts()) { |
1319 | unregister_adapter_interrupt(&ap_airq); | |
1320 | ap_airq_flag = 0; | |
1321 | } | |
1322 | /* Reset domain */ | |
1323 | if (!user_set_domain) | |
1324 | ap_domain_index = -1; | |
1325 | /* Get things going again */ | |
1326 | ap_suspend_flag = 0; | |
1327 | if (ap_airq_flag) | |
1328 | xchg(ap_airq.lsi_ptr, 0); | |
1329 | tasklet_enable(&ap_tasklet); | |
8139b89d | 1330 | queue_work(system_long_wq, &ap_scan_work); |
83e9d5d2 | 1331 | } |
772f5472 | 1332 | |
83e9d5d2 MS |
1333 | static int ap_power_event(struct notifier_block *this, unsigned long event, |
1334 | void *ptr) | |
1335 | { | |
1336 | switch (event) { | |
1337 | case PM_HIBERNATION_PREPARE: | |
1338 | case PM_SUSPEND_PREPARE: | |
1339 | ap_bus_suspend(); | |
1340 | break; | |
1341 | case PM_POST_HIBERNATION: | |
1342 | case PM_POST_SUSPEND: | |
1343 | ap_bus_resume(); | |
1344 | break; | |
1345 | default: | |
1346 | break; | |
1347 | } | |
1348 | return NOTIFY_DONE; | |
772f5472 | 1349 | } |
83e9d5d2 MS |
1350 | static struct notifier_block ap_power_notifier = { |
1351 | .notifier_call = ap_power_event, | |
1352 | }; | |
772f5472 | 1353 | |
3e488c95 LPC |
1354 | static SIMPLE_DEV_PM_OPS(ap_bus_pm_ops, ap_dev_suspend, NULL); |
1355 | ||
1534c382 MS |
1356 | static struct bus_type ap_bus_type = { |
1357 | .name = "ap", | |
1358 | .match = &ap_bus_match, | |
1359 | .uevent = &ap_uevent, | |
3e488c95 | 1360 | .pm = &ap_bus_pm_ops, |
1534c382 MS |
1361 | }; |
1362 | ||
d6d86c57 IT |
1363 | void ap_device_init_reply(struct ap_device *ap_dev, |
1364 | struct ap_message *reply) | |
1365 | { | |
1366 | ap_dev->reply = reply; | |
1367 | ||
1368 | spin_lock_bh(&ap_dev->lock); | |
1369 | ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_POLL)); | |
1370 | spin_unlock_bh(&ap_dev->lock); | |
1371 | } | |
1372 | EXPORT_SYMBOL(ap_device_init_reply); | |
1373 | ||
1534c382 MS |
1374 | static int ap_device_probe(struct device *dev) |
1375 | { | |
1376 | struct ap_device *ap_dev = to_ap_dev(dev); | |
3f3007af MS |
1377 | struct ap_driver *ap_drv = to_ap_drv(dev->driver); |
1378 | int rc; | |
666e68e0 | 1379 | |
3f3007af | 1380 | ap_dev->drv = ap_drv; |
1534c382 | 1381 | rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; |
3f3007af MS |
1382 | if (rc) |
1383 | ap_dev->drv = NULL; | |
1534c382 MS |
1384 | return rc; |
1385 | } | |
1386 | ||
1387 | /** | |
1749a81d FB |
1388 | * __ap_flush_queue(): Flush requests. |
1389 | * @ap_dev: Pointer to the AP device | |
1390 | * | |
1534c382 | 1391 | * Flush all requests from the request/pending queue of an AP device. |
1534c382 | 1392 | */ |
4d284cac | 1393 | static void __ap_flush_queue(struct ap_device *ap_dev) |
1534c382 MS |
1394 | { |
1395 | struct ap_message *ap_msg, *next; | |
1396 | ||
1397 | list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) { | |
1398 | list_del_init(&ap_msg->list); | |
1399 | ap_dev->pendingq_count--; | |
f58fe336 MS |
1400 | ap_msg->rc = -EAGAIN; |
1401 | ap_msg->receive(ap_dev, ap_msg, NULL); | |
1534c382 MS |
1402 | } |
1403 | list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) { | |
1404 | list_del_init(&ap_msg->list); | |
1405 | ap_dev->requestq_count--; | |
f58fe336 MS |
1406 | ap_msg->rc = -EAGAIN; |
1407 | ap_msg->receive(ap_dev, ap_msg, NULL); | |
1534c382 MS |
1408 | } |
1409 | } | |
1410 | ||
1411 | void ap_flush_queue(struct ap_device *ap_dev) | |
1412 | { | |
1413 | spin_lock_bh(&ap_dev->lock); | |
1414 | __ap_flush_queue(ap_dev); | |
1415 | spin_unlock_bh(&ap_dev->lock); | |
1416 | } | |
1417 | EXPORT_SYMBOL(ap_flush_queue); | |
1418 | ||
1419 | static int ap_device_remove(struct device *dev) | |
1420 | { | |
1421 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1422 | struct ap_driver *ap_drv = ap_dev->drv; | |
1423 | ||
4e56296d | 1424 | ap_flush_queue(ap_dev); |
af512ed0 | 1425 | del_timer_sync(&ap_dev->timeout); |
43c207e6 | 1426 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 1427 | list_del_init(&ap_dev->list); |
43c207e6 | 1428 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca RW |
1429 | if (ap_drv->remove) |
1430 | ap_drv->remove(ap_dev); | |
e675c0d2 RW |
1431 | spin_lock_bh(&ap_dev->lock); |
1432 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
1433 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
1434 | return 0; |
1435 | } | |
1436 | ||
3f3007af MS |
1437 | static void ap_device_release(struct device *dev) |
1438 | { | |
1439 | kfree(to_ap_dev(dev)); | |
1440 | } | |
1441 | ||
1534c382 MS |
1442 | int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, |
1443 | char *name) | |
1444 | { | |
1445 | struct device_driver *drv = &ap_drv->driver; | |
1446 | ||
e387753c SS |
1447 | if (!initialised) |
1448 | return -ENODEV; | |
1449 | ||
1534c382 MS |
1450 | drv->bus = &ap_bus_type; |
1451 | drv->probe = ap_device_probe; | |
1452 | drv->remove = ap_device_remove; | |
1453 | drv->owner = owner; | |
1454 | drv->name = name; | |
1455 | return driver_register(drv); | |
1456 | } | |
1457 | EXPORT_SYMBOL(ap_driver_register); | |
1458 | ||
1459 | void ap_driver_unregister(struct ap_driver *ap_drv) | |
1460 | { | |
1461 | driver_unregister(&ap_drv->driver); | |
1462 | } | |
1463 | EXPORT_SYMBOL(ap_driver_unregister); | |
1464 | ||
dabecb29 HD |
1465 | void ap_bus_force_rescan(void) |
1466 | { | |
83e9d5d2 MS |
1467 | if (ap_suspend_flag) |
1468 | return; | |
56bbe686 | 1469 | /* processing a asynchronous bus rescan */ |
fcd0d1f6 | 1470 | del_timer(&ap_config_timer); |
8139b89d MS |
1471 | queue_work(system_long_wq, &ap_scan_work); |
1472 | flush_work(&ap_scan_work); | |
dabecb29 HD |
1473 | } |
1474 | EXPORT_SYMBOL(ap_bus_force_rescan); | |
1475 | ||
1749a81d | 1476 | /* |
1534c382 MS |
1477 | * AP bus attributes. |
1478 | */ | |
1479 | static ssize_t ap_domain_show(struct bus_type *bus, char *buf) | |
1480 | { | |
1481 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); | |
1482 | } | |
1483 | ||
1484 | static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL); | |
1485 | ||
91f3e3ea IT |
1486 | static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf) |
1487 | { | |
889875a1 MS |
1488 | if (!ap_configuration) /* QCI not supported */ |
1489 | return snprintf(buf, PAGE_SIZE, "not supported\n"); | |
1490 | if (!test_facility(76)) | |
1491 | /* format 0 - 16 bit domain field */ | |
1492 | return snprintf(buf, PAGE_SIZE, "%08x%08x\n", | |
1493 | ap_configuration->adm[0], | |
1494 | ap_configuration->adm[1]); | |
1495 | /* format 1 - 256 bit domain field */ | |
1496 | return snprintf(buf, PAGE_SIZE, | |
1497 | "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", | |
91f3e3ea IT |
1498 | ap_configuration->adm[0], ap_configuration->adm[1], |
1499 | ap_configuration->adm[2], ap_configuration->adm[3], | |
1500 | ap_configuration->adm[4], ap_configuration->adm[5], | |
1501 | ap_configuration->adm[6], ap_configuration->adm[7]); | |
91f3e3ea IT |
1502 | } |
1503 | ||
1504 | static BUS_ATTR(ap_control_domain_mask, 0444, | |
1505 | ap_control_domain_mask_show, NULL); | |
1506 | ||
1534c382 MS |
1507 | static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) |
1508 | { | |
1509 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); | |
1510 | } | |
1511 | ||
cb17a636 FB |
1512 | static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) |
1513 | { | |
1514 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
1515 | ap_using_interrupts() ? 1 : 0); | |
1516 | } | |
1517 | ||
1518 | static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); | |
1519 | ||
1534c382 MS |
1520 | static ssize_t ap_config_time_store(struct bus_type *bus, |
1521 | const char *buf, size_t count) | |
1522 | { | |
1523 | int time; | |
1524 | ||
1525 | if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) | |
1526 | return -EINVAL; | |
1527 | ap_config_time = time; | |
fcd0d1f6 | 1528 | mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); |
1534c382 MS |
1529 | return count; |
1530 | } | |
1531 | ||
1532 | static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); | |
1533 | ||
1534 | static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) | |
1535 | { | |
1536 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); | |
1537 | } | |
1538 | ||
1539 | static ssize_t ap_poll_thread_store(struct bus_type *bus, | |
1540 | const char *buf, size_t count) | |
1541 | { | |
1542 | int flag, rc; | |
1543 | ||
1544 | if (sscanf(buf, "%d\n", &flag) != 1) | |
1545 | return -EINVAL; | |
1546 | if (flag) { | |
1547 | rc = ap_poll_thread_start(); | |
1548 | if (rc) | |
83e9d5d2 MS |
1549 | count = rc; |
1550 | } else | |
1534c382 MS |
1551 | ap_poll_thread_stop(); |
1552 | return count; | |
1553 | } | |
1554 | ||
1555 | static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); | |
1556 | ||
fe137230 FB |
1557 | static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) |
1558 | { | |
1559 | return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); | |
1560 | } | |
1561 | ||
1562 | static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, | |
1563 | size_t count) | |
1564 | { | |
1565 | unsigned long long time; | |
1566 | ktime_t hr_time; | |
1567 | ||
1568 | /* 120 seconds = maximum poll interval */ | |
cb17a636 FB |
1569 | if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || |
1570 | time > 120000000000ULL) | |
fe137230 FB |
1571 | return -EINVAL; |
1572 | poll_timeout = time; | |
1573 | hr_time = ktime_set(0, poll_timeout); | |
1574 | ||
8cc2af7c IT |
1575 | spin_lock_bh(&ap_poll_timer_lock); |
1576 | hrtimer_cancel(&ap_poll_timer); | |
1577 | hrtimer_set_expires(&ap_poll_timer, hr_time); | |
1578 | hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); | |
1579 | spin_unlock_bh(&ap_poll_timer_lock); | |
1580 | ||
fe137230 FB |
1581 | return count; |
1582 | } | |
1583 | ||
1584 | static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); | |
1585 | ||
5bc334bf IT |
1586 | static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf) |
1587 | { | |
889875a1 MS |
1588 | int max_domain_id; |
1589 | ||
1590 | if (ap_configuration) | |
1591 | max_domain_id = ap_max_domain_id ? : -1; | |
1592 | else | |
5bc334bf | 1593 | max_domain_id = 15; |
5bc334bf IT |
1594 | return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id); |
1595 | } | |
1596 | ||
1597 | static BUS_ATTR(ap_max_domain_id, 0444, ap_max_domain_id_show, NULL); | |
1598 | ||
1534c382 MS |
1599 | static struct bus_attribute *const ap_bus_attrs[] = { |
1600 | &bus_attr_ap_domain, | |
91f3e3ea | 1601 | &bus_attr_ap_control_domain_mask, |
1534c382 MS |
1602 | &bus_attr_config_time, |
1603 | &bus_attr_poll_thread, | |
cb17a636 | 1604 | &bus_attr_ap_interrupts, |
fe137230 | 1605 | &bus_attr_poll_timeout, |
5bc334bf | 1606 | &bus_attr_ap_max_domain_id, |
fe137230 | 1607 | NULL, |
1534c382 MS |
1608 | }; |
1609 | ||
1610 | /** | |
1749a81d FB |
1611 | * ap_select_domain(): Select an AP domain. |
1612 | * | |
1613 | * Pick one of the 16 AP domains. | |
1534c382 | 1614 | */ |
4d284cac | 1615 | static int ap_select_domain(void) |
1534c382 | 1616 | { |
6acbe21f MS |
1617 | int count, max_count, best_domain; |
1618 | struct ap_queue_status status; | |
1619 | int i, j; | |
1534c382 | 1620 | |
1749a81d | 1621 | /* |
1534c382 MS |
1622 | * We want to use a single domain. Either the one specified with |
1623 | * the "domain=" parameter or the domain with the maximum number | |
1624 | * of devices. | |
1625 | */ | |
889875a1 | 1626 | if (ap_domain_index >= 0) |
1534c382 MS |
1627 | /* Domain has already been selected. */ |
1628 | return 0; | |
1629 | best_domain = -1; | |
1630 | max_count = 0; | |
1631 | for (i = 0; i < AP_DOMAINS; i++) { | |
75014550 HD |
1632 | if (!ap_test_config_domain(i)) |
1633 | continue; | |
1534c382 MS |
1634 | count = 0; |
1635 | for (j = 0; j < AP_DEVICES; j++) { | |
75014550 HD |
1636 | if (!ap_test_config_card_id(j)) |
1637 | continue; | |
6acbe21f MS |
1638 | status = ap_test_queue(AP_MKQID(j, i), NULL); |
1639 | if (status.response_code != AP_RESPONSE_NORMAL) | |
1534c382 MS |
1640 | continue; |
1641 | count++; | |
1642 | } | |
1643 | if (count > max_count) { | |
1644 | max_count = count; | |
1645 | best_domain = i; | |
1646 | } | |
1647 | } | |
1648 | if (best_domain >= 0){ | |
1649 | ap_domain_index = best_domain; | |
1650 | return 0; | |
1651 | } | |
1652 | return -ENODEV; | |
1653 | } | |
1654 | ||
1534c382 | 1655 | /** |
1749a81d FB |
1656 | * __ap_scan_bus(): Scan the AP bus. |
1657 | * @dev: Pointer to device | |
1658 | * @data: Pointer to data | |
1659 | * | |
1660 | * Scan the AP bus for new devices. | |
1534c382 MS |
1661 | */ |
1662 | static int __ap_scan_bus(struct device *dev, void *data) | |
1663 | { | |
1664 | return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data; | |
1665 | } | |
1666 | ||
4927b3f7 | 1667 | static void ap_scan_bus(struct work_struct *unused) |
1534c382 MS |
1668 | { |
1669 | struct ap_device *ap_dev; | |
1670 | struct device *dev; | |
1671 | ap_qid_t qid; | |
c50a160c | 1672 | int queue_depth = 0, device_type = 0; |
3f3007af MS |
1673 | unsigned int device_functions = 0; |
1674 | int rc, i, borked; | |
1534c382 | 1675 | |
75014550 | 1676 | ap_query_configuration(); |
83e9d5d2 | 1677 | if (ap_select_domain() != 0) |
fcd0d1f6 | 1678 | goto out; |
889875a1 | 1679 | |
1534c382 MS |
1680 | for (i = 0; i < AP_DEVICES; i++) { |
1681 | qid = AP_MKQID(i, ap_domain_index); | |
1682 | dev = bus_find_device(&ap_bus_type, NULL, | |
1683 | (void *)(unsigned long)qid, | |
1684 | __ap_scan_bus); | |
889875a1 MS |
1685 | rc = ap_query_queue(qid, &queue_depth, &device_type, |
1686 | &device_functions); | |
c6a48264 RW |
1687 | if (dev) { |
1688 | ap_dev = to_ap_dev(dev); | |
1689 | spin_lock_bh(&ap_dev->lock); | |
3f3007af MS |
1690 | if (rc == -ENODEV) |
1691 | ap_dev->state = AP_STATE_BORKED; | |
1692 | borked = ap_dev->state == AP_STATE_BORKED; | |
af512ed0 | 1693 | spin_unlock_bh(&ap_dev->lock); |
3f3007af MS |
1694 | if (borked) /* Remove broken device */ |
1695 | device_unregister(dev); | |
1534c382 | 1696 | put_device(dev); |
3f3007af MS |
1697 | if (!borked) |
1698 | continue; | |
1534c382 | 1699 | } |
1534c382 MS |
1700 | if (rc) |
1701 | continue; | |
1702 | ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL); | |
1703 | if (!ap_dev) | |
1704 | break; | |
1705 | ap_dev->qid = qid; | |
3f3007af MS |
1706 | ap_dev->state = AP_STATE_RESET_START; |
1707 | ap_dev->interrupt = AP_INTR_DISABLED; | |
1534c382 | 1708 | ap_dev->queue_depth = queue_depth; |
6acbe21f MS |
1709 | ap_dev->raw_hwtype = device_type; |
1710 | ap_dev->device_type = device_type; | |
1711 | ap_dev->functions = device_functions; | |
1534c382 MS |
1712 | spin_lock_init(&ap_dev->lock); |
1713 | INIT_LIST_HEAD(&ap_dev->pendingq); | |
1714 | INIT_LIST_HEAD(&ap_dev->requestq); | |
cf352ce0 | 1715 | INIT_LIST_HEAD(&ap_dev->list); |
af512ed0 RW |
1716 | setup_timer(&ap_dev->timeout, ap_request_timeout, |
1717 | (unsigned long) ap_dev); | |
1e2076f4 | 1718 | |
1534c382 MS |
1719 | ap_dev->device.bus = &ap_bus_type; |
1720 | ap_dev->device.parent = ap_root_device; | |
3f3007af MS |
1721 | rc = dev_set_name(&ap_dev->device, "card%02x", |
1722 | AP_QID_DEVICE(ap_dev->qid)); | |
1723 | if (rc) { | |
edc44fa0 FB |
1724 | kfree(ap_dev); |
1725 | continue; | |
1726 | } | |
3f3007af MS |
1727 | /* Add to list of devices */ |
1728 | spin_lock_bh(&ap_device_list_lock); | |
1729 | list_add(&ap_dev->list, &ap_device_list); | |
1730 | spin_unlock_bh(&ap_device_list_lock); | |
1731 | /* Start with a device reset */ | |
1732 | spin_lock_bh(&ap_dev->lock); | |
1733 | ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_POLL)); | |
1734 | spin_unlock_bh(&ap_dev->lock); | |
1735 | /* Register device */ | |
1534c382 MS |
1736 | ap_dev->device.release = ap_device_release; |
1737 | rc = device_register(&ap_dev->device); | |
1738 | if (rc) { | |
3f3007af MS |
1739 | spin_lock_bh(&ap_dev->lock); |
1740 | list_del_init(&ap_dev->list); | |
1741 | spin_unlock_bh(&ap_dev->lock); | |
c6304933 | 1742 | put_device(&ap_dev->device); |
1534c382 MS |
1743 | continue; |
1744 | } | |
1745 | /* Add device attributes. */ | |
1746 | rc = sysfs_create_group(&ap_dev->device.kobj, | |
1747 | &ap_dev_attr_group); | |
3f3007af | 1748 | if (rc) { |
1534c382 | 1749 | device_unregister(&ap_dev->device); |
3f3007af MS |
1750 | continue; |
1751 | } | |
1534c382 | 1752 | } |
fcd0d1f6 MS |
1753 | out: |
1754 | mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); | |
1534c382 MS |
1755 | } |
1756 | ||
83e9d5d2 | 1757 | static void ap_config_timeout(unsigned long ptr) |
1534c382 | 1758 | { |
83e9d5d2 MS |
1759 | if (ap_suspend_flag) |
1760 | return; | |
8139b89d | 1761 | queue_work(system_long_wq, &ap_scan_work); |
1534c382 MS |
1762 | } |
1763 | ||
13e742ba RW |
1764 | static void ap_reset_domain(void) |
1765 | { | |
1766 | int i; | |
1767 | ||
889875a1 MS |
1768 | if (ap_domain_index == -1 || !ap_test_config_domain(ap_domain_index)) |
1769 | return; | |
1770 | for (i = 0; i < AP_DEVICES; i++) | |
1771 | ap_reset_queue(AP_MKQID(i, ap_domain_index)); | |
13e742ba RW |
1772 | } |
1773 | ||
1774 | static void ap_reset_all(void) | |
85eca850 RW |
1775 | { |
1776 | int i, j; | |
1777 | ||
170387a8 IT |
1778 | for (i = 0; i < AP_DOMAINS; i++) { |
1779 | if (!ap_test_config_domain(i)) | |
1780 | continue; | |
1781 | for (j = 0; j < AP_DEVICES; j++) { | |
1782 | if (!ap_test_config_card_id(j)) | |
1783 | continue; | |
85eca850 | 1784 | ap_reset_queue(AP_MKQID(j, i)); |
170387a8 IT |
1785 | } |
1786 | } | |
85eca850 RW |
1787 | } |
1788 | ||
1789 | static struct reset_call ap_reset_call = { | |
13e742ba | 1790 | .fn = ap_reset_all, |
85eca850 RW |
1791 | }; |
1792 | ||
1534c382 | 1793 | /** |
1749a81d FB |
1794 | * ap_module_init(): The module initialization code. |
1795 | * | |
1796 | * Initializes the module. | |
1534c382 MS |
1797 | */ |
1798 | int __init ap_module_init(void) | |
1799 | { | |
889875a1 | 1800 | int max_domain_id; |
1534c382 MS |
1801 | int rc, i; |
1802 | ||
889875a1 MS |
1803 | if (ap_instructions_available() != 0) { |
1804 | pr_warn("The hardware system does not support AP instructions\n"); | |
1805 | return -ENODEV; | |
1806 | } | |
1807 | ||
1808 | /* Get AP configuration data if available */ | |
1809 | ap_init_configuration(); | |
1810 | ||
1811 | if (ap_configuration) | |
1812 | max_domain_id = ap_max_domain_id ? : (AP_DOMAINS - 1); | |
1813 | else | |
1814 | max_domain_id = 15; | |
1815 | if (ap_domain_index < -1 || ap_domain_index > max_domain_id) { | |
1816 | pr_warn("%d is not a valid cryptographic domain\n", | |
1817 | ap_domain_index); | |
33c388b8 WY |
1818 | rc = -EINVAL; |
1819 | goto out_free; | |
1534c382 | 1820 | } |
5314af69 FB |
1821 | /* In resume callback we need to know if the user had set the domain. |
1822 | * If so, we can not just reset it. | |
1823 | */ | |
1824 | if (ap_domain_index >= 0) | |
1825 | user_set_domain = 1; | |
1826 | ||
cb17a636 | 1827 | if (ap_interrupts_available()) { |
f4eae94f MS |
1828 | rc = register_adapter_interrupt(&ap_airq); |
1829 | ap_airq_flag = (rc == 0); | |
cb17a636 FB |
1830 | } |
1831 | ||
85eca850 | 1832 | register_reset_call(&ap_reset_call); |
1534c382 MS |
1833 | |
1834 | /* Create /sys/bus/ap. */ | |
1835 | rc = bus_register(&ap_bus_type); | |
1836 | if (rc) | |
1837 | goto out; | |
1838 | for (i = 0; ap_bus_attrs[i]; i++) { | |
1839 | rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); | |
1840 | if (rc) | |
1841 | goto out_bus; | |
1842 | } | |
1843 | ||
1844 | /* Create /sys/devices/ap. */ | |
035da16f | 1845 | ap_root_device = root_device_register("ap"); |
ba8da213 | 1846 | rc = PTR_RET(ap_root_device); |
1534c382 MS |
1847 | if (rc) |
1848 | goto out_bus; | |
1849 | ||
1749a81d | 1850 | /* Setup the AP bus rescan timer. */ |
fcd0d1f6 | 1851 | setup_timer(&ap_config_timer, ap_config_timeout, 0); |
1534c382 | 1852 | |
3f3007af MS |
1853 | /* |
1854 | * Setup the high resultion poll timer. | |
fe137230 FB |
1855 | * If we are running under z/VM adjust polling to z/VM polling rate. |
1856 | */ | |
1857 | if (MACHINE_IS_VM) | |
1858 | poll_timeout = 1500000; | |
93521314 | 1859 | spin_lock_init(&ap_poll_timer_lock); |
fe137230 FB |
1860 | hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
1861 | ap_poll_timer.function = ap_poll_timeout; | |
1862 | ||
1534c382 MS |
1863 | /* Start the low priority AP bus poll thread. */ |
1864 | if (ap_thread_flag) { | |
1865 | rc = ap_poll_thread_start(); | |
1866 | if (rc) | |
1867 | goto out_work; | |
1868 | } | |
1869 | ||
83e9d5d2 MS |
1870 | rc = register_pm_notifier(&ap_power_notifier); |
1871 | if (rc) | |
1872 | goto out_pm; | |
1873 | ||
8139b89d | 1874 | queue_work(system_long_wq, &ap_scan_work); |
e387753c | 1875 | initialised = true; |
3f3007af | 1876 | |
1534c382 MS |
1877 | return 0; |
1878 | ||
83e9d5d2 MS |
1879 | out_pm: |
1880 | ap_poll_thread_stop(); | |
1534c382 | 1881 | out_work: |
fe137230 | 1882 | hrtimer_cancel(&ap_poll_timer); |
035da16f | 1883 | root_device_unregister(ap_root_device); |
1534c382 MS |
1884 | out_bus: |
1885 | while (i--) | |
1886 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1887 | bus_unregister(&ap_bus_type); | |
1888 | out: | |
85eca850 | 1889 | unregister_reset_call(&ap_reset_call); |
f4eae94f MS |
1890 | if (ap_using_interrupts()) |
1891 | unregister_adapter_interrupt(&ap_airq); | |
33c388b8 | 1892 | out_free: |
889875a1 | 1893 | kfree(ap_configuration); |
1534c382 MS |
1894 | return rc; |
1895 | } | |
1896 | ||
1534c382 | 1897 | /** |
1749a81d FB |
1898 | * ap_modules_exit(): The module termination code |
1899 | * | |
1900 | * Terminates the module. | |
1534c382 MS |
1901 | */ |
1902 | void ap_module_exit(void) | |
1903 | { | |
1904 | int i; | |
1534c382 | 1905 | |
e387753c | 1906 | initialised = false; |
13e742ba | 1907 | ap_reset_domain(); |
1534c382 MS |
1908 | ap_poll_thread_stop(); |
1909 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1910 | hrtimer_cancel(&ap_poll_timer); |
13e742ba | 1911 | tasklet_kill(&ap_tasklet); |
83e9d5d2 | 1912 | bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_devices_unregister); |
1534c382 MS |
1913 | for (i = 0; ap_bus_attrs[i]; i++) |
1914 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
83e9d5d2 | 1915 | unregister_pm_notifier(&ap_power_notifier); |
f60b8d44 | 1916 | root_device_unregister(ap_root_device); |
1534c382 | 1917 | bus_unregister(&ap_bus_type); |
889875a1 | 1918 | kfree(ap_configuration); |
85eca850 | 1919 | unregister_reset_call(&ap_reset_call); |
f4eae94f MS |
1920 | if (ap_using_interrupts()) |
1921 | unregister_adapter_interrupt(&ap_airq); | |
1534c382 MS |
1922 | } |
1923 | ||
1534c382 MS |
1924 | module_init(ap_module_init); |
1925 | module_exit(ap_module_exit); |