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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 */ | |
fc1d3f02 | 65 | static DEFINE_SPINLOCK(ap_domain_lock); |
c1a42f49 | 66 | module_param_named(domain, ap_domain_index, int, S_IRUSR|S_IRGRP); |
1534c382 MS |
67 | MODULE_PARM_DESC(domain, "domain index for ap devices"); |
68 | EXPORT_SYMBOL(ap_domain_index); | |
69 | ||
b90b34c6 | 70 | static int ap_thread_flag = 0; |
c1a42f49 | 71 | module_param_named(poll_thread, ap_thread_flag, int, S_IRUSR|S_IRGRP); |
b90b34c6 | 72 | MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); |
1534c382 MS |
73 | |
74 | static struct device *ap_root_device = NULL; | |
75014550 | 75 | static struct ap_config_info *ap_configuration; |
43c207e6 | 76 | static DEFINE_SPINLOCK(ap_device_list_lock); |
cf352ce0 | 77 | static LIST_HEAD(ap_device_list); |
e387753c | 78 | static bool initialised; |
1534c382 | 79 | |
1749a81d | 80 | /* |
8139b89d | 81 | * Workqueue timer for bus rescan. |
1534c382 | 82 | */ |
1534c382 MS |
83 | static struct timer_list ap_config_timer; |
84 | static int ap_config_time = AP_CONFIG_TIME; | |
3f3007af | 85 | static void ap_scan_bus(struct work_struct *); |
8139b89d | 86 | static DECLARE_WORK(ap_scan_work, ap_scan_bus); |
1534c382 | 87 | |
1749a81d | 88 | /* |
cb17a636 | 89 | * Tasklet & timer for AP request polling and interrupts |
1534c382 | 90 | */ |
3f3007af MS |
91 | static void ap_tasklet_fn(unsigned long); |
92 | static DECLARE_TASKLET(ap_tasklet, ap_tasklet_fn, 0); | |
1534c382 MS |
93 | static atomic_t ap_poll_requests = ATOMIC_INIT(0); |
94 | static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); | |
95 | static struct task_struct *ap_poll_kthread = NULL; | |
96 | static DEFINE_MUTEX(ap_poll_thread_mutex); | |
93521314 | 97 | static DEFINE_SPINLOCK(ap_poll_timer_lock); |
fe137230 FB |
98 | static struct hrtimer ap_poll_timer; |
99 | /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. | |
100 | * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ | |
101 | static unsigned long long poll_timeout = 250000; | |
1534c382 | 102 | |
772f5472 FB |
103 | /* Suspend flag */ |
104 | static int ap_suspend_flag; | |
889875a1 MS |
105 | /* Maximum domain id */ |
106 | static int ap_max_domain_id; | |
5314af69 FB |
107 | /* Flag to check if domain was set through module parameter domain=. This is |
108 | * important when supsend and resume is done in a z/VM environment where the | |
109 | * domain might change. */ | |
110 | static int user_set_domain = 0; | |
772f5472 FB |
111 | static struct bus_type ap_bus_type; |
112 | ||
f4eae94f | 113 | /* Adapter interrupt definitions */ |
3f3007af MS |
114 | static void ap_interrupt_handler(struct airq_struct *airq); |
115 | ||
f4eae94f MS |
116 | static int ap_airq_flag; |
117 | ||
118 | static struct airq_struct ap_airq = { | |
119 | .handler = ap_interrupt_handler, | |
120 | .isc = AP_ISC, | |
121 | }; | |
122 | ||
cb17a636 FB |
123 | /** |
124 | * ap_using_interrupts() - Returns non-zero if interrupt support is | |
125 | * available. | |
126 | */ | |
127 | static inline int ap_using_interrupts(void) | |
128 | { | |
f4eae94f | 129 | return ap_airq_flag; |
cb17a636 FB |
130 | } |
131 | ||
1534c382 | 132 | /** |
1749a81d | 133 | * ap_intructions_available() - Test if AP instructions are available. |
1534c382 | 134 | * |
1749a81d | 135 | * Returns 0 if the AP instructions are installed. |
1534c382 MS |
136 | */ |
137 | static inline int ap_instructions_available(void) | |
138 | { | |
139 | register unsigned long reg0 asm ("0") = AP_MKQID(0,0); | |
140 | register unsigned long reg1 asm ("1") = -ENODEV; | |
141 | register unsigned long reg2 asm ("2") = 0UL; | |
142 | ||
143 | asm volatile( | |
144 | " .long 0xb2af0000\n" /* PQAP(TAPQ) */ | |
145 | "0: la %1,0\n" | |
146 | "1:\n" | |
147 | EX_TABLE(0b, 1b) | |
148 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" ); | |
149 | return reg1; | |
150 | } | |
151 | ||
cb17a636 FB |
152 | /** |
153 | * ap_interrupts_available(): Test if AP interrupts are available. | |
154 | * | |
155 | * Returns 1 if AP interrupts are available. | |
156 | */ | |
157 | static int ap_interrupts_available(void) | |
158 | { | |
86cd741b | 159 | return test_facility(65); |
cb17a636 FB |
160 | } |
161 | ||
75014550 HD |
162 | /** |
163 | * ap_configuration_available(): Test if AP configuration | |
164 | * information is available. | |
165 | * | |
166 | * Returns 1 if AP configuration information is available. | |
167 | */ | |
168 | static int ap_configuration_available(void) | |
169 | { | |
86cd741b | 170 | return test_facility(12); |
75014550 HD |
171 | } |
172 | ||
11d37673 HC |
173 | static inline struct ap_queue_status |
174 | __pqap_tapq(ap_qid_t qid, unsigned long *info) | |
175 | { | |
176 | register unsigned long reg0 asm ("0") = qid; | |
177 | register struct ap_queue_status reg1 asm ("1"); | |
178 | register unsigned long reg2 asm ("2") = 0UL; | |
179 | ||
180 | asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */ | |
181 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
182 | *info = reg2; | |
183 | return reg1; | |
184 | } | |
185 | ||
1534c382 | 186 | /** |
1749a81d FB |
187 | * ap_test_queue(): Test adjunct processor queue. |
188 | * @qid: The AP queue number | |
6acbe21f | 189 | * @info: Pointer to queue descriptor |
1534c382 | 190 | * |
1749a81d | 191 | * Returns AP queue status structure. |
1534c382 MS |
192 | */ |
193 | static inline struct ap_queue_status | |
6acbe21f | 194 | ap_test_queue(ap_qid_t qid, unsigned long *info) |
1534c382 | 195 | { |
11d37673 HC |
196 | struct ap_queue_status aqs; |
197 | unsigned long _info; | |
1534c382 | 198 | |
6acbe21f | 199 | if (test_facility(15)) |
11d37673 HC |
200 | qid |= 1UL << 23; /* set APFT T bit*/ |
201 | aqs = __pqap_tapq(qid, &_info); | |
6acbe21f | 202 | if (info) |
11d37673 HC |
203 | *info = _info; |
204 | return aqs; | |
1534c382 MS |
205 | } |
206 | ||
207 | /** | |
1749a81d FB |
208 | * ap_reset_queue(): Reset adjunct processor queue. |
209 | * @qid: The AP queue number | |
1534c382 | 210 | * |
1749a81d | 211 | * Returns AP queue status structure. |
1534c382 MS |
212 | */ |
213 | static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) | |
214 | { | |
215 | register unsigned long reg0 asm ("0") = qid | 0x01000000UL; | |
216 | register struct ap_queue_status reg1 asm ("1"); | |
217 | register unsigned long reg2 asm ("2") = 0UL; | |
218 | ||
219 | asm volatile( | |
220 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
221 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
222 | return reg1; | |
223 | } | |
224 | ||
cb17a636 FB |
225 | /** |
226 | * ap_queue_interruption_control(): Enable interruption for a specific AP. | |
227 | * @qid: The AP queue number | |
228 | * @ind: The notification indicator byte | |
229 | * | |
230 | * Returns AP queue status. | |
231 | */ | |
232 | static inline struct ap_queue_status | |
233 | ap_queue_interruption_control(ap_qid_t qid, void *ind) | |
234 | { | |
235 | register unsigned long reg0 asm ("0") = qid | 0x03000000UL; | |
236 | register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC; | |
237 | register struct ap_queue_status reg1_out asm ("1"); | |
238 | register void *reg2 asm ("2") = ind; | |
239 | asm volatile( | |
a7475afd | 240 | ".long 0xb2af0000" /* PQAP(AQIC) */ |
cb17a636 FB |
241 | : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) |
242 | : | |
243 | : "cc" ); | |
244 | return reg1_out; | |
245 | } | |
cb17a636 | 246 | |
889875a1 MS |
247 | /** |
248 | * ap_query_configuration(): Get AP configuration data | |
249 | * | |
250 | * Returns 0 on success, or -EOPNOTSUPP. | |
251 | */ | |
11d37673 | 252 | static inline int __ap_query_configuration(void) |
75014550 HD |
253 | { |
254 | register unsigned long reg0 asm ("0") = 0x04000000UL; | |
255 | register unsigned long reg1 asm ("1") = -EINVAL; | |
889875a1 | 256 | register void *reg2 asm ("2") = (void *) ap_configuration; |
75014550 HD |
257 | |
258 | asm volatile( | |
259 | ".long 0xb2af0000\n" /* PQAP(QCI) */ | |
260 | "0: la %1,0\n" | |
261 | "1:\n" | |
262 | EX_TABLE(0b, 1b) | |
263 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) | |
264 | : | |
265 | : "cc"); | |
266 | ||
267 | return reg1; | |
268 | } | |
75014550 | 269 | |
11d37673 HC |
270 | static inline int ap_query_configuration(void) |
271 | { | |
272 | if (!ap_configuration) | |
273 | return -EOPNOTSUPP; | |
274 | return __ap_query_configuration(); | |
275 | } | |
276 | ||
889875a1 MS |
277 | /** |
278 | * ap_init_configuration(): Allocate and query configuration array. | |
279 | */ | |
280 | static void ap_init_configuration(void) | |
281 | { | |
282 | if (!ap_configuration_available()) | |
283 | return; | |
284 | ||
285 | ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL); | |
286 | if (!ap_configuration) | |
287 | return; | |
288 | if (ap_query_configuration() != 0) { | |
289 | kfree(ap_configuration); | |
290 | ap_configuration = NULL; | |
291 | return; | |
292 | } | |
293 | } | |
294 | ||
295 | /* | |
296 | * ap_test_config(): helper function to extract the nrth bit | |
297 | * within the unsigned int array field. | |
298 | */ | |
299 | static inline int ap_test_config(unsigned int *field, unsigned int nr) | |
300 | { | |
301 | return ap_test_bit((field + (nr >> 5)), (nr & 0x1f)); | |
302 | } | |
303 | ||
304 | /* | |
305 | * ap_test_config_card_id(): Test, whether an AP card ID is configured. | |
306 | * @id AP card ID | |
307 | * | |
308 | * Returns 0 if the card is not configured | |
309 | * 1 if the card is configured or | |
310 | * if the configuration information is not available | |
311 | */ | |
312 | static inline int ap_test_config_card_id(unsigned int id) | |
313 | { | |
314 | if (!ap_configuration) /* QCI not supported */ | |
315 | return 1; | |
316 | return ap_test_config(ap_configuration->apm, id); | |
317 | } | |
318 | ||
319 | /* | |
320 | * ap_test_config_domain(): Test, whether an AP usage domain is configured. | |
321 | * @domain AP usage domain ID | |
322 | * | |
323 | * Returns 0 if the usage domain is not configured | |
324 | * 1 if the usage domain is configured or | |
325 | * if the configuration information is not available | |
326 | */ | |
327 | static inline int ap_test_config_domain(unsigned int domain) | |
328 | { | |
329 | if (!ap_configuration) /* QCI not supported */ | |
330 | return domain < 16; | |
331 | return ap_test_config(ap_configuration->aqm, domain); | |
332 | } | |
333 | ||
cb17a636 FB |
334 | /** |
335 | * ap_queue_enable_interruption(): Enable interruption on an AP. | |
336 | * @qid: The AP queue number | |
337 | * @ind: the notification indicator byte | |
338 | * | |
339 | * Enables interruption on AP queue via ap_queue_interruption_control(). Based | |
340 | * on the return value it waits a while and tests the AP queue if interrupts | |
341 | * have been switched on using ap_test_queue(). | |
342 | */ | |
c50a160c | 343 | static int ap_queue_enable_interruption(struct ap_device *ap_dev, void *ind) |
cb17a636 | 344 | { |
cb17a636 | 345 | struct ap_queue_status status; |
cb17a636 | 346 | |
c50a160c IT |
347 | status = ap_queue_interruption_control(ap_dev->qid, ind); |
348 | switch (status.response_code) { | |
349 | case AP_RESPONSE_NORMAL: | |
350 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
351 | return 0; | |
352 | case AP_RESPONSE_Q_NOT_AVAIL: | |
353 | case AP_RESPONSE_DECONFIGURED: | |
354 | case AP_RESPONSE_CHECKSTOPPED: | |
355 | case AP_RESPONSE_INVALID_ADDRESS: | |
3f3007af MS |
356 | pr_err("Registering adapter interrupts for AP %d failed\n", |
357 | AP_QID_DEVICE(ap_dev->qid)); | |
358 | return -EOPNOTSUPP; | |
c50a160c IT |
359 | case AP_RESPONSE_RESET_IN_PROGRESS: |
360 | case AP_RESPONSE_BUSY: | |
361 | default: | |
362 | return -EBUSY; | |
cb17a636 | 363 | } |
cb17a636 FB |
364 | } |
365 | ||
11d37673 HC |
366 | static inline struct ap_queue_status |
367 | __nqap(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
368 | { | |
369 | typedef struct { char _[length]; } msgblock; | |
370 | register unsigned long reg0 asm ("0") = qid | 0x40000000UL; | |
371 | register struct ap_queue_status reg1 asm ("1"); | |
372 | register unsigned long reg2 asm ("2") = (unsigned long) msg; | |
373 | register unsigned long reg3 asm ("3") = (unsigned long) length; | |
374 | register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32); | |
375 | register unsigned long reg5 asm ("5") = psmid & 0xffffffff; | |
376 | ||
377 | asm volatile ( | |
378 | "0: .long 0xb2ad0042\n" /* NQAP */ | |
379 | " brc 2,0b" | |
380 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) | |
381 | : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) | |
382 | : "cc"); | |
383 | return reg1; | |
384 | } | |
385 | ||
1534c382 | 386 | /** |
1749a81d FB |
387 | * __ap_send(): Send message to adjunct processor queue. |
388 | * @qid: The AP queue number | |
389 | * @psmid: The program supplied message identifier | |
390 | * @msg: The message text | |
391 | * @length: The message length | |
a6a5d73a | 392 | * @special: Special Bit |
1534c382 | 393 | * |
1749a81d | 394 | * Returns AP queue status structure. |
1534c382 | 395 | * Condition code 1 on NQAP can't happen because the L bit is 1. |
1534c382 MS |
396 | * Condition code 2 on NQAP also means the send is incomplete, |
397 | * because a segment boundary was reached. The NQAP is repeated. | |
398 | */ | |
399 | static inline struct ap_queue_status | |
a6a5d73a FB |
400 | __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length, |
401 | unsigned int special) | |
1534c382 | 402 | { |
a6a5d73a | 403 | if (special == 1) |
11d37673 HC |
404 | qid |= 0x400000UL; |
405 | return __nqap(qid, psmid, msg, length); | |
1534c382 MS |
406 | } |
407 | ||
408 | int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
409 | { | |
410 | struct ap_queue_status status; | |
411 | ||
a6a5d73a | 412 | status = __ap_send(qid, psmid, msg, length, 0); |
1534c382 MS |
413 | switch (status.response_code) { |
414 | case AP_RESPONSE_NORMAL: | |
415 | return 0; | |
416 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 417 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 | 418 | return -EBUSY; |
a6a5d73a FB |
419 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
420 | return -EINVAL; | |
1534c382 MS |
421 | default: /* Device is gone. */ |
422 | return -ENODEV; | |
423 | } | |
424 | } | |
425 | EXPORT_SYMBOL(ap_send); | |
426 | ||
1749a81d FB |
427 | /** |
428 | * __ap_recv(): Receive message from adjunct processor queue. | |
429 | * @qid: The AP queue number | |
430 | * @psmid: Pointer to program supplied message identifier | |
431 | * @msg: The message text | |
432 | * @length: The message length | |
1534c382 | 433 | * |
1749a81d | 434 | * Returns AP queue status structure. |
1534c382 MS |
435 | * Condition code 1 on DQAP means the receive has taken place |
436 | * but only partially. The response is incomplete, hence the | |
437 | * DQAP is repeated. | |
1534c382 MS |
438 | * Condition code 2 on DQAP also means the receive is incomplete, |
439 | * this time because a segment boundary was reached. Again, the | |
440 | * DQAP is repeated. | |
1534c382 MS |
441 | * Note that gpr2 is used by the DQAP instruction to keep track of |
442 | * any 'residual' length, in case the instruction gets interrupted. | |
443 | * Hence it gets zeroed before the instruction. | |
444 | */ | |
445 | static inline struct ap_queue_status | |
446 | __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
447 | { | |
448 | typedef struct { char _[length]; } msgblock; | |
449 | register unsigned long reg0 asm("0") = qid | 0x80000000UL; | |
450 | register struct ap_queue_status reg1 asm ("1"); | |
451 | register unsigned long reg2 asm("2") = 0UL; | |
452 | register unsigned long reg4 asm("4") = (unsigned long) msg; | |
453 | register unsigned long reg5 asm("5") = (unsigned long) length; | |
454 | register unsigned long reg6 asm("6") = 0UL; | |
455 | register unsigned long reg7 asm("7") = 0UL; | |
456 | ||
457 | ||
458 | asm volatile( | |
a7475afd | 459 | "0: .long 0xb2ae0064\n" /* DQAP */ |
1534c382 MS |
460 | " brc 6,0b\n" |
461 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), | |
462 | "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), | |
463 | "=m" (*(msgblock *) msg) : : "cc" ); | |
464 | *psmid = (((unsigned long long) reg6) << 32) + reg7; | |
465 | return reg1; | |
466 | } | |
467 | ||
468 | int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
469 | { | |
470 | struct ap_queue_status status; | |
471 | ||
d6d86c57 IT |
472 | if (msg == NULL) |
473 | return -EINVAL; | |
1534c382 MS |
474 | status = __ap_recv(qid, psmid, msg, length); |
475 | switch (status.response_code) { | |
476 | case AP_RESPONSE_NORMAL: | |
477 | return 0; | |
478 | case AP_RESPONSE_NO_PENDING_REPLY: | |
479 | if (status.queue_empty) | |
480 | return -ENOENT; | |
481 | return -EBUSY; | |
af512ed0 RW |
482 | case AP_RESPONSE_RESET_IN_PROGRESS: |
483 | return -EBUSY; | |
1534c382 MS |
484 | default: |
485 | return -ENODEV; | |
486 | } | |
487 | } | |
488 | EXPORT_SYMBOL(ap_recv); | |
489 | ||
490 | /** | |
1749a81d FB |
491 | * ap_query_queue(): Check if an AP queue is available. |
492 | * @qid: The AP queue number | |
493 | * @queue_depth: Pointer to queue depth value | |
494 | * @device_type: Pointer to device type value | |
6acbe21f | 495 | * @facilities: Pointer to facility indicator |
1534c382 | 496 | */ |
6acbe21f MS |
497 | static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type, |
498 | unsigned int *facilities) | |
1534c382 MS |
499 | { |
500 | struct ap_queue_status status; | |
6acbe21f | 501 | unsigned long info; |
889875a1 MS |
502 | int nd; |
503 | ||
504 | if (!ap_test_config_card_id(AP_QID_DEVICE(qid))) | |
505 | return -ENODEV; | |
1534c382 | 506 | |
6acbe21f | 507 | status = ap_test_queue(qid, &info); |
c50a160c IT |
508 | switch (status.response_code) { |
509 | case AP_RESPONSE_NORMAL: | |
6acbe21f MS |
510 | *queue_depth = (int)(info & 0xff); |
511 | *device_type = (int)((info >> 24) & 0xff); | |
512 | *facilities = (unsigned int)(info >> 32); | |
889875a1 MS |
513 | /* Update maximum domain id */ |
514 | nd = (info >> 16) & 0xff; | |
515 | if ((info & (1UL << 57)) && nd > 0) | |
516 | ap_max_domain_id = nd; | |
c50a160c IT |
517 | return 0; |
518 | case AP_RESPONSE_Q_NOT_AVAIL: | |
519 | case AP_RESPONSE_DECONFIGURED: | |
520 | case AP_RESPONSE_CHECKSTOPPED: | |
521 | case AP_RESPONSE_INVALID_ADDRESS: | |
522 | return -ENODEV; | |
523 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
524 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
525 | case AP_RESPONSE_BUSY: | |
526 | return -EBUSY; | |
527 | default: | |
528 | BUG(); | |
1534c382 | 529 | } |
1534c382 MS |
530 | } |
531 | ||
3f3007af MS |
532 | /* State machine definitions and helpers */ |
533 | ||
534 | static void ap_sm_wait(enum ap_wait wait) | |
535 | { | |
536 | ktime_t hr_time; | |
537 | ||
538 | switch (wait) { | |
539 | case AP_WAIT_AGAIN: | |
540 | case AP_WAIT_INTERRUPT: | |
541 | if (ap_using_interrupts()) | |
542 | break; | |
543 | if (ap_poll_kthread) { | |
544 | wake_up(&ap_poll_wait); | |
545 | break; | |
546 | } | |
547 | /* Fall through */ | |
548 | case AP_WAIT_TIMEOUT: | |
549 | spin_lock_bh(&ap_poll_timer_lock); | |
550 | if (!hrtimer_is_queued(&ap_poll_timer)) { | |
551 | hr_time = ktime_set(0, poll_timeout); | |
552 | hrtimer_forward_now(&ap_poll_timer, hr_time); | |
553 | hrtimer_restart(&ap_poll_timer); | |
554 | } | |
555 | spin_unlock_bh(&ap_poll_timer_lock); | |
556 | break; | |
557 | case AP_WAIT_NONE: | |
558 | default: | |
559 | break; | |
560 | } | |
561 | } | |
562 | ||
563 | static enum ap_wait ap_sm_nop(struct ap_device *ap_dev) | |
564 | { | |
565 | return AP_WAIT_NONE; | |
566 | } | |
567 | ||
568 | /** | |
569 | * ap_sm_recv(): Receive pending reply messages from an AP device but do | |
570 | * not change the state of the device. | |
571 | * @ap_dev: pointer to the AP device | |
572 | * | |
573 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
574 | */ | |
575 | static struct ap_queue_status ap_sm_recv(struct ap_device *ap_dev) | |
576 | { | |
577 | struct ap_queue_status status; | |
578 | struct ap_message *ap_msg; | |
579 | ||
580 | status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid, | |
581 | ap_dev->reply->message, ap_dev->reply->length); | |
582 | switch (status.response_code) { | |
583 | case AP_RESPONSE_NORMAL: | |
584 | atomic_dec(&ap_poll_requests); | |
585 | ap_dev->queue_count--; | |
586 | if (ap_dev->queue_count > 0) | |
587 | mod_timer(&ap_dev->timeout, | |
588 | jiffies + ap_dev->drv->request_timeout); | |
589 | list_for_each_entry(ap_msg, &ap_dev->pendingq, list) { | |
590 | if (ap_msg->psmid != ap_dev->reply->psmid) | |
591 | continue; | |
592 | list_del_init(&ap_msg->list); | |
593 | ap_dev->pendingq_count--; | |
594 | ap_msg->receive(ap_dev, ap_msg, ap_dev->reply); | |
595 | break; | |
596 | } | |
597 | case AP_RESPONSE_NO_PENDING_REPLY: | |
598 | if (!status.queue_empty || ap_dev->queue_count <= 0) | |
599 | break; | |
600 | /* The card shouldn't forget requests but who knows. */ | |
601 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
602 | ap_dev->queue_count = 0; | |
603 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
604 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
605 | ap_dev->pendingq_count = 0; | |
606 | break; | |
607 | default: | |
608 | break; | |
609 | } | |
610 | return status; | |
611 | } | |
612 | ||
613 | /** | |
614 | * ap_sm_read(): Receive pending reply messages from an AP device. | |
615 | * @ap_dev: pointer to the AP device | |
616 | * | |
617 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
618 | */ | |
619 | static enum ap_wait ap_sm_read(struct ap_device *ap_dev) | |
620 | { | |
621 | struct ap_queue_status status; | |
622 | ||
d6d86c57 IT |
623 | if (!ap_dev->reply) |
624 | return AP_WAIT_NONE; | |
3f3007af MS |
625 | status = ap_sm_recv(ap_dev); |
626 | switch (status.response_code) { | |
627 | case AP_RESPONSE_NORMAL: | |
2bc53b80 IT |
628 | if (ap_dev->queue_count > 0) { |
629 | ap_dev->state = AP_STATE_WORKING; | |
3f3007af | 630 | return AP_WAIT_AGAIN; |
2bc53b80 | 631 | } |
3f3007af MS |
632 | ap_dev->state = AP_STATE_IDLE; |
633 | return AP_WAIT_NONE; | |
634 | case AP_RESPONSE_NO_PENDING_REPLY: | |
635 | if (ap_dev->queue_count > 0) | |
636 | return AP_WAIT_INTERRUPT; | |
637 | ap_dev->state = AP_STATE_IDLE; | |
638 | return AP_WAIT_NONE; | |
639 | default: | |
640 | ap_dev->state = AP_STATE_BORKED; | |
641 | return AP_WAIT_NONE; | |
642 | } | |
643 | } | |
644 | ||
d6d86c57 IT |
645 | /** |
646 | * ap_sm_suspend_read(): Receive pending reply messages from an AP device | |
647 | * without changing the device state in between. In suspend mode we don't | |
648 | * allow sending new requests, therefore just fetch pending replies. | |
649 | * @ap_dev: pointer to the AP device | |
650 | * | |
651 | * Returns AP_WAIT_NONE or AP_WAIT_AGAIN | |
652 | */ | |
653 | static enum ap_wait ap_sm_suspend_read(struct ap_device *ap_dev) | |
654 | { | |
655 | struct ap_queue_status status; | |
656 | ||
657 | if (!ap_dev->reply) | |
658 | return AP_WAIT_NONE; | |
659 | status = ap_sm_recv(ap_dev); | |
660 | switch (status.response_code) { | |
661 | case AP_RESPONSE_NORMAL: | |
662 | if (ap_dev->queue_count > 0) | |
663 | return AP_WAIT_AGAIN; | |
664 | /* fall through */ | |
665 | default: | |
666 | return AP_WAIT_NONE; | |
667 | } | |
668 | } | |
669 | ||
3f3007af MS |
670 | /** |
671 | * ap_sm_write(): Send messages from the request queue to an AP device. | |
672 | * @ap_dev: pointer to the AP device | |
673 | * | |
674 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
675 | */ | |
676 | static enum ap_wait ap_sm_write(struct ap_device *ap_dev) | |
677 | { | |
678 | struct ap_queue_status status; | |
679 | struct ap_message *ap_msg; | |
680 | ||
681 | if (ap_dev->requestq_count <= 0) | |
682 | return AP_WAIT_NONE; | |
683 | /* Start the next request on the queue. */ | |
684 | ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list); | |
685 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
686 | ap_msg->message, ap_msg->length, ap_msg->special); | |
687 | switch (status.response_code) { | |
688 | case AP_RESPONSE_NORMAL: | |
689 | atomic_inc(&ap_poll_requests); | |
690 | ap_dev->queue_count++; | |
691 | if (ap_dev->queue_count == 1) | |
692 | mod_timer(&ap_dev->timeout, | |
693 | jiffies + ap_dev->drv->request_timeout); | |
694 | list_move_tail(&ap_msg->list, &ap_dev->pendingq); | |
695 | ap_dev->requestq_count--; | |
696 | ap_dev->pendingq_count++; | |
697 | if (ap_dev->queue_count < ap_dev->queue_depth) { | |
698 | ap_dev->state = AP_STATE_WORKING; | |
699 | return AP_WAIT_AGAIN; | |
700 | } | |
701 | /* fall through */ | |
702 | case AP_RESPONSE_Q_FULL: | |
703 | ap_dev->state = AP_STATE_QUEUE_FULL; | |
704 | return AP_WAIT_INTERRUPT; | |
705 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
706 | ap_dev->state = AP_STATE_RESET_WAIT; | |
707 | return AP_WAIT_TIMEOUT; | |
708 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
709 | case AP_RESPONSE_REQ_FAC_NOT_INST: | |
710 | list_del_init(&ap_msg->list); | |
711 | ap_dev->requestq_count--; | |
712 | ap_msg->rc = -EINVAL; | |
713 | ap_msg->receive(ap_dev, ap_msg, NULL); | |
714 | return AP_WAIT_AGAIN; | |
715 | default: | |
716 | ap_dev->state = AP_STATE_BORKED; | |
717 | return AP_WAIT_NONE; | |
718 | } | |
719 | } | |
720 | ||
1534c382 | 721 | /** |
3f3007af MS |
722 | * ap_sm_read_write(): Send and receive messages to/from an AP device. |
723 | * @ap_dev: pointer to the AP device | |
724 | * | |
725 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
726 | */ | |
727 | static enum ap_wait ap_sm_read_write(struct ap_device *ap_dev) | |
728 | { | |
729 | return min(ap_sm_read(ap_dev), ap_sm_write(ap_dev)); | |
730 | } | |
731 | ||
732 | /** | |
733 | * ap_sm_reset(): Reset an AP queue. | |
1749a81d FB |
734 | * @qid: The AP queue number |
735 | * | |
c50a160c | 736 | * Submit the Reset command to an AP queue. |
1534c382 | 737 | */ |
3f3007af | 738 | static enum ap_wait ap_sm_reset(struct ap_device *ap_dev) |
1534c382 MS |
739 | { |
740 | struct ap_queue_status status; | |
1534c382 | 741 | |
c50a160c IT |
742 | status = ap_reset_queue(ap_dev->qid); |
743 | switch (status.response_code) { | |
744 | case AP_RESPONSE_NORMAL: | |
c50a160c | 745 | case AP_RESPONSE_RESET_IN_PROGRESS: |
3f3007af MS |
746 | ap_dev->state = AP_STATE_RESET_WAIT; |
747 | ap_dev->interrupt = AP_INTR_DISABLED; | |
748 | return AP_WAIT_TIMEOUT; | |
c50a160c | 749 | case AP_RESPONSE_BUSY: |
3f3007af | 750 | return AP_WAIT_TIMEOUT; |
c50a160c IT |
751 | case AP_RESPONSE_Q_NOT_AVAIL: |
752 | case AP_RESPONSE_DECONFIGURED: | |
753 | case AP_RESPONSE_CHECKSTOPPED: | |
754 | default: | |
3f3007af MS |
755 | ap_dev->state = AP_STATE_BORKED; |
756 | return AP_WAIT_NONE; | |
cb17a636 | 757 | } |
1534c382 MS |
758 | } |
759 | ||
af512ed0 | 760 | /** |
3f3007af MS |
761 | * ap_sm_reset_wait(): Test queue for completion of the reset operation |
762 | * @ap_dev: pointer to the AP device | |
1749a81d | 763 | * |
3f3007af | 764 | * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0. |
af512ed0 | 765 | */ |
3f3007af | 766 | static enum ap_wait ap_sm_reset_wait(struct ap_device *ap_dev) |
af512ed0 | 767 | { |
3f3007af MS |
768 | struct ap_queue_status status; |
769 | unsigned long info; | |
af512ed0 | 770 | |
d6d86c57 | 771 | if (ap_dev->queue_count > 0 && ap_dev->reply) |
3f3007af MS |
772 | /* Try to read a completed message and get the status */ |
773 | status = ap_sm_recv(ap_dev); | |
774 | else | |
775 | /* Get the status with TAPQ */ | |
776 | status = ap_test_queue(ap_dev->qid, &info); | |
777 | ||
778 | switch (status.response_code) { | |
779 | case AP_RESPONSE_NORMAL: | |
780 | if (ap_using_interrupts() && | |
781 | ap_queue_enable_interruption(ap_dev, | |
782 | ap_airq.lsi_ptr) == 0) | |
783 | ap_dev->state = AP_STATE_SETIRQ_WAIT; | |
784 | else | |
785 | ap_dev->state = (ap_dev->queue_count > 0) ? | |
786 | AP_STATE_WORKING : AP_STATE_IDLE; | |
787 | return AP_WAIT_AGAIN; | |
788 | case AP_RESPONSE_BUSY: | |
789 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
790 | return AP_WAIT_TIMEOUT; | |
791 | case AP_RESPONSE_Q_NOT_AVAIL: | |
792 | case AP_RESPONSE_DECONFIGURED: | |
793 | case AP_RESPONSE_CHECKSTOPPED: | |
794 | default: | |
795 | ap_dev->state = AP_STATE_BORKED; | |
796 | return AP_WAIT_NONE; | |
af512ed0 RW |
797 | } |
798 | } | |
799 | ||
800 | /** | |
3f3007af MS |
801 | * ap_sm_setirq_wait(): Test queue for completion of the irq enablement |
802 | * @ap_dev: pointer to the AP device | |
1749a81d | 803 | * |
3f3007af | 804 | * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0. |
af512ed0 | 805 | */ |
3f3007af | 806 | static enum ap_wait ap_sm_setirq_wait(struct ap_device *ap_dev) |
af512ed0 | 807 | { |
3f3007af MS |
808 | struct ap_queue_status status; |
809 | unsigned long info; | |
af512ed0 | 810 | |
d6d86c57 | 811 | if (ap_dev->queue_count > 0 && ap_dev->reply) |
3f3007af MS |
812 | /* Try to read a completed message and get the status */ |
813 | status = ap_sm_recv(ap_dev); | |
af512ed0 | 814 | else |
3f3007af MS |
815 | /* Get the status with TAPQ */ |
816 | status = ap_test_queue(ap_dev->qid, &info); | |
817 | ||
818 | if (status.int_enabled == 1) { | |
819 | /* Irqs are now enabled */ | |
820 | ap_dev->interrupt = AP_INTR_ENABLED; | |
821 | ap_dev->state = (ap_dev->queue_count > 0) ? | |
822 | AP_STATE_WORKING : AP_STATE_IDLE; | |
823 | } | |
824 | ||
825 | switch (status.response_code) { | |
826 | case AP_RESPONSE_NORMAL: | |
827 | if (ap_dev->queue_count > 0) | |
828 | return AP_WAIT_AGAIN; | |
829 | /* fallthrough */ | |
830 | case AP_RESPONSE_NO_PENDING_REPLY: | |
831 | return AP_WAIT_TIMEOUT; | |
832 | default: | |
833 | ap_dev->state = AP_STATE_BORKED; | |
834 | return AP_WAIT_NONE; | |
835 | } | |
836 | } | |
837 | ||
838 | /* | |
839 | * AP state machine jump table | |
840 | */ | |
f70a34c5 | 841 | static ap_func_t *ap_jumptable[NR_AP_STATES][NR_AP_EVENTS] = { |
3f3007af MS |
842 | [AP_STATE_RESET_START] = { |
843 | [AP_EVENT_POLL] = ap_sm_reset, | |
844 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
845 | }, | |
846 | [AP_STATE_RESET_WAIT] = { | |
847 | [AP_EVENT_POLL] = ap_sm_reset_wait, | |
848 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
849 | }, | |
850 | [AP_STATE_SETIRQ_WAIT] = { | |
851 | [AP_EVENT_POLL] = ap_sm_setirq_wait, | |
852 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
853 | }, | |
854 | [AP_STATE_IDLE] = { | |
855 | [AP_EVENT_POLL] = ap_sm_write, | |
856 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
857 | }, | |
858 | [AP_STATE_WORKING] = { | |
859 | [AP_EVENT_POLL] = ap_sm_read_write, | |
860 | [AP_EVENT_TIMEOUT] = ap_sm_reset, | |
861 | }, | |
862 | [AP_STATE_QUEUE_FULL] = { | |
863 | [AP_EVENT_POLL] = ap_sm_read, | |
864 | [AP_EVENT_TIMEOUT] = ap_sm_reset, | |
865 | }, | |
866 | [AP_STATE_SUSPEND_WAIT] = { | |
d6d86c57 | 867 | [AP_EVENT_POLL] = ap_sm_suspend_read, |
3f3007af MS |
868 | [AP_EVENT_TIMEOUT] = ap_sm_nop, |
869 | }, | |
870 | [AP_STATE_BORKED] = { | |
871 | [AP_EVENT_POLL] = ap_sm_nop, | |
872 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
873 | }, | |
874 | }; | |
875 | ||
876 | static inline enum ap_wait ap_sm_event(struct ap_device *ap_dev, | |
877 | enum ap_event event) | |
878 | { | |
879 | return ap_jumptable[ap_dev->state][event](ap_dev); | |
880 | } | |
881 | ||
882 | static inline enum ap_wait ap_sm_event_loop(struct ap_device *ap_dev, | |
883 | enum ap_event event) | |
884 | { | |
885 | enum ap_wait wait; | |
886 | ||
887 | while ((wait = ap_sm_event(ap_dev, event)) == AP_WAIT_AGAIN) | |
888 | ; | |
889 | return wait; | |
890 | } | |
891 | ||
892 | /** | |
893 | * ap_request_timeout(): Handling of request timeouts | |
894 | * @data: Holds the AP device. | |
895 | * | |
896 | * Handles request timeouts. | |
897 | */ | |
898 | static void ap_request_timeout(unsigned long data) | |
899 | { | |
900 | struct ap_device *ap_dev = (struct ap_device *) data; | |
901 | ||
902 | if (ap_suspend_flag) | |
903 | return; | |
904 | spin_lock_bh(&ap_dev->lock); | |
905 | ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_TIMEOUT)); | |
906 | spin_unlock_bh(&ap_dev->lock); | |
907 | } | |
908 | ||
909 | /** | |
910 | * ap_poll_timeout(): AP receive polling for finished AP requests. | |
911 | * @unused: Unused pointer. | |
912 | * | |
913 | * Schedules the AP tasklet using a high resolution timer. | |
914 | */ | |
915 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) | |
916 | { | |
917 | if (!ap_suspend_flag) | |
918 | tasklet_schedule(&ap_tasklet); | |
919 | return HRTIMER_NORESTART; | |
920 | } | |
921 | ||
922 | /** | |
923 | * ap_interrupt_handler() - Schedule ap_tasklet on interrupt | |
924 | * @airq: pointer to adapter interrupt descriptor | |
925 | */ | |
926 | static void ap_interrupt_handler(struct airq_struct *airq) | |
927 | { | |
928 | inc_irq_stat(IRQIO_APB); | |
929 | if (!ap_suspend_flag) | |
930 | tasklet_schedule(&ap_tasklet); | |
931 | } | |
932 | ||
933 | /** | |
934 | * ap_tasklet_fn(): Tasklet to poll all AP devices. | |
935 | * @dummy: Unused variable | |
936 | * | |
937 | * Poll all AP devices on the bus. | |
938 | */ | |
939 | static void ap_tasklet_fn(unsigned long dummy) | |
940 | { | |
941 | struct ap_device *ap_dev; | |
942 | enum ap_wait wait = AP_WAIT_NONE; | |
943 | ||
944 | /* Reset the indicator if interrupts are used. Thus new interrupts can | |
945 | * be received. Doing it in the beginning of the tasklet is therefor | |
946 | * important that no requests on any AP get lost. | |
947 | */ | |
948 | if (ap_using_interrupts()) | |
949 | xchg(ap_airq.lsi_ptr, 0); | |
950 | ||
951 | spin_lock(&ap_device_list_lock); | |
952 | list_for_each_entry(ap_dev, &ap_device_list, list) { | |
953 | spin_lock_bh(&ap_dev->lock); | |
954 | wait = min(wait, ap_sm_event_loop(ap_dev, AP_EVENT_POLL)); | |
955 | spin_unlock_bh(&ap_dev->lock); | |
956 | } | |
957 | spin_unlock(&ap_device_list_lock); | |
958 | ap_sm_wait(wait); | |
af512ed0 RW |
959 | } |
960 | ||
83e9d5d2 MS |
961 | /** |
962 | * ap_poll_thread(): Thread that polls for finished requests. | |
963 | * @data: Unused pointer | |
964 | * | |
965 | * AP bus poll thread. The purpose of this thread is to poll for | |
966 | * finished requests in a loop if there is a "free" cpu - that is | |
967 | * a cpu that doesn't have anything better to do. The polling stops | |
968 | * as soon as there is another task or if all messages have been | |
969 | * delivered. | |
970 | */ | |
971 | static int ap_poll_thread(void *data) | |
972 | { | |
973 | DECLARE_WAITQUEUE(wait, current); | |
83e9d5d2 MS |
974 | |
975 | set_user_nice(current, MAX_NICE); | |
976 | set_freezable(); | |
977 | while (!kthread_should_stop()) { | |
978 | add_wait_queue(&ap_poll_wait, &wait); | |
979 | set_current_state(TASK_INTERRUPTIBLE); | |
980 | if (ap_suspend_flag || | |
981 | atomic_read(&ap_poll_requests) <= 0) { | |
982 | schedule(); | |
983 | try_to_freeze(); | |
984 | } | |
985 | set_current_state(TASK_RUNNING); | |
986 | remove_wait_queue(&ap_poll_wait, &wait); | |
83e9d5d2 MS |
987 | if (need_resched()) { |
988 | schedule(); | |
989 | try_to_freeze(); | |
990 | continue; | |
991 | } | |
3f3007af | 992 | ap_tasklet_fn(0); |
83e9d5d2 MS |
993 | } while (!kthread_should_stop()); |
994 | return 0; | |
995 | } | |
996 | ||
997 | static int ap_poll_thread_start(void) | |
998 | { | |
999 | int rc; | |
1000 | ||
1001 | if (ap_using_interrupts() || ap_poll_kthread) | |
1002 | return 0; | |
1003 | mutex_lock(&ap_poll_thread_mutex); | |
1004 | ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); | |
1005 | rc = PTR_RET(ap_poll_kthread); | |
1006 | if (rc) | |
1007 | ap_poll_kthread = NULL; | |
1008 | mutex_unlock(&ap_poll_thread_mutex); | |
1009 | return rc; | |
1010 | } | |
1011 | ||
1012 | static void ap_poll_thread_stop(void) | |
1013 | { | |
1014 | if (!ap_poll_kthread) | |
1015 | return; | |
1016 | mutex_lock(&ap_poll_thread_mutex); | |
1017 | kthread_stop(ap_poll_kthread); | |
1018 | ap_poll_kthread = NULL; | |
1019 | mutex_unlock(&ap_poll_thread_mutex); | |
1020 | } | |
1021 | ||
3f3007af MS |
1022 | /** |
1023 | * ap_queue_message(): Queue a request to an AP device. | |
1024 | * @ap_dev: The AP device to queue the message to | |
1025 | * @ap_msg: The message that is to be added | |
1026 | */ | |
1027 | void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1028 | { | |
1029 | /* For asynchronous message handling a valid receive-callback | |
1030 | * is required. */ | |
1031 | BUG_ON(!ap_msg->receive); | |
1032 | ||
1033 | spin_lock_bh(&ap_dev->lock); | |
1034 | /* Queue the message. */ | |
1035 | list_add_tail(&ap_msg->list, &ap_dev->requestq); | |
1036 | ap_dev->requestq_count++; | |
1037 | ap_dev->total_request_count++; | |
1038 | /* Send/receive as many request from the queue as possible. */ | |
1039 | ap_sm_wait(ap_sm_event_loop(ap_dev, AP_EVENT_POLL)); | |
1040 | spin_unlock_bh(&ap_dev->lock); | |
1041 | } | |
1042 | EXPORT_SYMBOL(ap_queue_message); | |
1043 | ||
1044 | /** | |
1045 | * ap_cancel_message(): Cancel a crypto request. | |
1046 | * @ap_dev: The AP device that has the message queued | |
1047 | * @ap_msg: The message that is to be removed | |
1048 | * | |
1049 | * Cancel a crypto request. This is done by removing the request | |
1050 | * from the device pending or request queue. Note that the | |
1051 | * request stays on the AP queue. When it finishes the message | |
1052 | * reply will be discarded because the psmid can't be found. | |
1053 | */ | |
1054 | void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1055 | { | |
1056 | struct ap_message *tmp; | |
1057 | ||
1058 | spin_lock_bh(&ap_dev->lock); | |
1059 | if (!list_empty(&ap_msg->list)) { | |
1060 | list_for_each_entry(tmp, &ap_dev->pendingq, list) | |
1061 | if (tmp->psmid == ap_msg->psmid) { | |
1062 | ap_dev->pendingq_count--; | |
1063 | goto found; | |
1064 | } | |
1065 | ap_dev->requestq_count--; | |
1066 | found: | |
1067 | list_del_init(&ap_msg->list); | |
1068 | } | |
1069 | spin_unlock_bh(&ap_dev->lock); | |
1070 | } | |
1071 | EXPORT_SYMBOL(ap_cancel_message); | |
1072 | ||
1749a81d | 1073 | /* |
1534c382 MS |
1074 | * AP device related attributes. |
1075 | */ | |
1076 | static ssize_t ap_hwtype_show(struct device *dev, | |
1077 | struct device_attribute *attr, char *buf) | |
1078 | { | |
1079 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1080 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); | |
1081 | } | |
1534c382 | 1082 | |
43c207e6 | 1083 | static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); |
42f4dd61 IT |
1084 | |
1085 | static ssize_t ap_raw_hwtype_show(struct device *dev, | |
1086 | struct device_attribute *attr, char *buf) | |
1087 | { | |
1088 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1089 | ||
1090 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->raw_hwtype); | |
1091 | } | |
1092 | ||
1093 | static DEVICE_ATTR(raw_hwtype, 0444, ap_raw_hwtype_show, NULL); | |
1094 | ||
1534c382 MS |
1095 | static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr, |
1096 | char *buf) | |
1097 | { | |
1098 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1099 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth); | |
1100 | } | |
1534c382 | 1101 | |
43c207e6 | 1102 | static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); |
1534c382 MS |
1103 | static ssize_t ap_request_count_show(struct device *dev, |
1104 | struct device_attribute *attr, | |
1105 | char *buf) | |
1106 | { | |
1107 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1108 | int rc; | |
1109 | ||
1110 | spin_lock_bh(&ap_dev->lock); | |
1111 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count); | |
1112 | spin_unlock_bh(&ap_dev->lock); | |
1113 | return rc; | |
1114 | } | |
1115 | ||
1116 | static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); | |
1117 | ||
b26bd941 HD |
1118 | static ssize_t ap_requestq_count_show(struct device *dev, |
1119 | struct device_attribute *attr, char *buf) | |
1120 | { | |
1121 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1122 | int rc; | |
1123 | ||
1124 | spin_lock_bh(&ap_dev->lock); | |
1125 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->requestq_count); | |
1126 | spin_unlock_bh(&ap_dev->lock); | |
1127 | return rc; | |
1128 | } | |
1129 | ||
1130 | static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL); | |
1131 | ||
1132 | static ssize_t ap_pendingq_count_show(struct device *dev, | |
1133 | struct device_attribute *attr, char *buf) | |
1134 | { | |
1135 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1136 | int rc; | |
1137 | ||
1138 | spin_lock_bh(&ap_dev->lock); | |
1139 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->pendingq_count); | |
1140 | spin_unlock_bh(&ap_dev->lock); | |
1141 | return rc; | |
1142 | } | |
1143 | ||
1144 | static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL); | |
1145 | ||
c50a160c IT |
1146 | static ssize_t ap_reset_show(struct device *dev, |
1147 | struct device_attribute *attr, char *buf) | |
1148 | { | |
1149 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1150 | int rc = 0; | |
1151 | ||
1152 | spin_lock_bh(&ap_dev->lock); | |
3f3007af MS |
1153 | switch (ap_dev->state) { |
1154 | case AP_STATE_RESET_START: | |
1155 | case AP_STATE_RESET_WAIT: | |
1156 | rc = snprintf(buf, PAGE_SIZE, "Reset in progress.\n"); | |
c50a160c | 1157 | break; |
3f3007af MS |
1158 | case AP_STATE_WORKING: |
1159 | case AP_STATE_QUEUE_FULL: | |
c50a160c IT |
1160 | rc = snprintf(buf, PAGE_SIZE, "Reset Timer armed.\n"); |
1161 | break; | |
c50a160c | 1162 | default: |
3f3007af | 1163 | rc = snprintf(buf, PAGE_SIZE, "No Reset Timer set.\n"); |
c50a160c IT |
1164 | } |
1165 | spin_unlock_bh(&ap_dev->lock); | |
1166 | return rc; | |
1167 | } | |
1168 | ||
1169 | static DEVICE_ATTR(reset, 0444, ap_reset_show, NULL); | |
1170 | ||
1171 | static ssize_t ap_interrupt_show(struct device *dev, | |
1172 | struct device_attribute *attr, char *buf) | |
1173 | { | |
1174 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1175 | int rc = 0; | |
1176 | ||
1177 | spin_lock_bh(&ap_dev->lock); | |
3f3007af | 1178 | if (ap_dev->state == AP_STATE_SETIRQ_WAIT) |
c50a160c | 1179 | rc = snprintf(buf, PAGE_SIZE, "Enable Interrupt pending.\n"); |
3f3007af MS |
1180 | else if (ap_dev->interrupt == AP_INTR_ENABLED) |
1181 | rc = snprintf(buf, PAGE_SIZE, "Interrupts enabled.\n"); | |
1182 | else | |
1183 | rc = snprintf(buf, PAGE_SIZE, "Interrupts disabled.\n"); | |
c50a160c IT |
1184 | spin_unlock_bh(&ap_dev->lock); |
1185 | return rc; | |
1186 | } | |
1187 | ||
1188 | static DEVICE_ATTR(interrupt, 0444, ap_interrupt_show, NULL); | |
1189 | ||
1534c382 MS |
1190 | static ssize_t ap_modalias_show(struct device *dev, |
1191 | struct device_attribute *attr, char *buf) | |
1192 | { | |
c50a160c | 1193 | return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type); |
1534c382 MS |
1194 | } |
1195 | ||
1196 | static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); | |
1197 | ||
b26bd941 HD |
1198 | static ssize_t ap_functions_show(struct device *dev, |
1199 | struct device_attribute *attr, char *buf) | |
1200 | { | |
1201 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1202 | return snprintf(buf, PAGE_SIZE, "0x%08X\n", ap_dev->functions); | |
1203 | } | |
1204 | ||
1205 | static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL); | |
1206 | ||
1534c382 MS |
1207 | static struct attribute *ap_dev_attrs[] = { |
1208 | &dev_attr_hwtype.attr, | |
42f4dd61 | 1209 | &dev_attr_raw_hwtype.attr, |
1534c382 MS |
1210 | &dev_attr_depth.attr, |
1211 | &dev_attr_request_count.attr, | |
b26bd941 HD |
1212 | &dev_attr_requestq_count.attr, |
1213 | &dev_attr_pendingq_count.attr, | |
c50a160c IT |
1214 | &dev_attr_reset.attr, |
1215 | &dev_attr_interrupt.attr, | |
1534c382 | 1216 | &dev_attr_modalias.attr, |
b26bd941 | 1217 | &dev_attr_ap_functions.attr, |
1534c382 MS |
1218 | NULL |
1219 | }; | |
1220 | static struct attribute_group ap_dev_attr_group = { | |
1221 | .attrs = ap_dev_attrs | |
1222 | }; | |
1223 | ||
1224 | /** | |
1749a81d FB |
1225 | * ap_bus_match() |
1226 | * @dev: Pointer to device | |
1227 | * @drv: Pointer to device_driver | |
1228 | * | |
1534c382 MS |
1229 | * AP bus driver registration/unregistration. |
1230 | */ | |
1231 | static int ap_bus_match(struct device *dev, struct device_driver *drv) | |
1232 | { | |
1233 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1234 | struct ap_driver *ap_drv = to_ap_drv(drv); | |
1235 | struct ap_device_id *id; | |
1236 | ||
1749a81d | 1237 | /* |
1534c382 MS |
1238 | * Compare device type of the device with the list of |
1239 | * supported types of the device_driver. | |
1240 | */ | |
1241 | for (id = ap_drv->ids; id->match_flags; id++) { | |
1242 | if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) && | |
1243 | (id->dev_type != ap_dev->device_type)) | |
1244 | continue; | |
1245 | return 1; | |
1246 | } | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | /** | |
1749a81d FB |
1251 | * ap_uevent(): Uevent function for AP devices. |
1252 | * @dev: Pointer to device | |
1253 | * @env: Pointer to kobj_uevent_env | |
1254 | * | |
1255 | * It sets up a single environment variable DEV_TYPE which contains the | |
1256 | * hardware device type. | |
1534c382 | 1257 | */ |
7eff2e7a | 1258 | static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) |
1534c382 MS |
1259 | { |
1260 | struct ap_device *ap_dev = to_ap_dev(dev); | |
7eff2e7a | 1261 | int retval = 0; |
1534c382 MS |
1262 | |
1263 | if (!ap_dev) | |
1264 | return -ENODEV; | |
1265 | ||
1266 | /* Set up DEV_TYPE environment variable. */ | |
7eff2e7a | 1267 | retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); |
bf62456e ER |
1268 | if (retval) |
1269 | return retval; | |
1270 | ||
66a4263b | 1271 | /* Add MODALIAS= */ |
7eff2e7a | 1272 | retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); |
bf62456e | 1273 | |
bf62456e | 1274 | return retval; |
1534c382 MS |
1275 | } |
1276 | ||
3e488c95 | 1277 | static int ap_dev_suspend(struct device *dev) |
772f5472 FB |
1278 | { |
1279 | struct ap_device *ap_dev = to_ap_dev(dev); | |
772f5472 | 1280 | |
772f5472 | 1281 | /* Poll on the device until all requests are finished. */ |
3f3007af MS |
1282 | spin_lock_bh(&ap_dev->lock); |
1283 | ap_dev->state = AP_STATE_SUSPEND_WAIT; | |
1284 | while (ap_sm_event(ap_dev, AP_EVENT_POLL) != AP_WAIT_NONE) | |
1285 | ; | |
1286 | ap_dev->state = AP_STATE_BORKED; | |
1287 | spin_unlock_bh(&ap_dev->lock); | |
83e9d5d2 MS |
1288 | return 0; |
1289 | } | |
5314af69 | 1290 | |
83e9d5d2 MS |
1291 | static void ap_bus_suspend(void) |
1292 | { | |
1293 | ap_suspend_flag = 1; | |
1294 | /* | |
1295 | * Disable scanning for devices, thus we do not want to scan | |
1296 | * for them after removing. | |
1297 | */ | |
8139b89d | 1298 | flush_work(&ap_scan_work); |
83e9d5d2 MS |
1299 | tasklet_disable(&ap_tasklet); |
1300 | } | |
1301 | ||
1302 | static int __ap_devices_unregister(struct device *dev, void *dummy) | |
1303 | { | |
1304 | device_unregister(dev); | |
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | static void ap_bus_resume(void) | |
772f5472 | 1309 | { |
f4eae94f | 1310 | int rc; |
772f5472 | 1311 | |
83e9d5d2 MS |
1312 | /* Unconditionally remove all AP devices */ |
1313 | bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_devices_unregister); | |
1314 | /* Reset thin interrupt setting */ | |
1315 | if (ap_interrupts_available() && !ap_using_interrupts()) { | |
1316 | rc = register_adapter_interrupt(&ap_airq); | |
1317 | ap_airq_flag = (rc == 0); | |
5314af69 | 1318 | } |
83e9d5d2 MS |
1319 | if (!ap_interrupts_available() && ap_using_interrupts()) { |
1320 | unregister_adapter_interrupt(&ap_airq); | |
1321 | ap_airq_flag = 0; | |
1322 | } | |
1323 | /* Reset domain */ | |
1324 | if (!user_set_domain) | |
1325 | ap_domain_index = -1; | |
1326 | /* Get things going again */ | |
1327 | ap_suspend_flag = 0; | |
1328 | if (ap_airq_flag) | |
1329 | xchg(ap_airq.lsi_ptr, 0); | |
1330 | tasklet_enable(&ap_tasklet); | |
8139b89d | 1331 | queue_work(system_long_wq, &ap_scan_work); |
83e9d5d2 | 1332 | } |
772f5472 | 1333 | |
83e9d5d2 MS |
1334 | static int ap_power_event(struct notifier_block *this, unsigned long event, |
1335 | void *ptr) | |
1336 | { | |
1337 | switch (event) { | |
1338 | case PM_HIBERNATION_PREPARE: | |
1339 | case PM_SUSPEND_PREPARE: | |
1340 | ap_bus_suspend(); | |
1341 | break; | |
1342 | case PM_POST_HIBERNATION: | |
1343 | case PM_POST_SUSPEND: | |
1344 | ap_bus_resume(); | |
1345 | break; | |
1346 | default: | |
1347 | break; | |
1348 | } | |
1349 | return NOTIFY_DONE; | |
772f5472 | 1350 | } |
83e9d5d2 MS |
1351 | static struct notifier_block ap_power_notifier = { |
1352 | .notifier_call = ap_power_event, | |
1353 | }; | |
772f5472 | 1354 | |
3e488c95 LPC |
1355 | static SIMPLE_DEV_PM_OPS(ap_bus_pm_ops, ap_dev_suspend, NULL); |
1356 | ||
1534c382 MS |
1357 | static struct bus_type ap_bus_type = { |
1358 | .name = "ap", | |
1359 | .match = &ap_bus_match, | |
1360 | .uevent = &ap_uevent, | |
3e488c95 | 1361 | .pm = &ap_bus_pm_ops, |
1534c382 MS |
1362 | }; |
1363 | ||
d6d86c57 IT |
1364 | void ap_device_init_reply(struct ap_device *ap_dev, |
1365 | struct ap_message *reply) | |
1366 | { | |
1367 | ap_dev->reply = reply; | |
1368 | ||
1369 | spin_lock_bh(&ap_dev->lock); | |
1370 | ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_POLL)); | |
1371 | spin_unlock_bh(&ap_dev->lock); | |
1372 | } | |
1373 | EXPORT_SYMBOL(ap_device_init_reply); | |
1374 | ||
1534c382 MS |
1375 | static int ap_device_probe(struct device *dev) |
1376 | { | |
1377 | struct ap_device *ap_dev = to_ap_dev(dev); | |
3f3007af MS |
1378 | struct ap_driver *ap_drv = to_ap_drv(dev->driver); |
1379 | int rc; | |
666e68e0 | 1380 | |
3f3007af | 1381 | ap_dev->drv = ap_drv; |
1534c382 | 1382 | rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; |
3f3007af MS |
1383 | if (rc) |
1384 | ap_dev->drv = NULL; | |
1534c382 MS |
1385 | return rc; |
1386 | } | |
1387 | ||
1388 | /** | |
1749a81d FB |
1389 | * __ap_flush_queue(): Flush requests. |
1390 | * @ap_dev: Pointer to the AP device | |
1391 | * | |
1534c382 | 1392 | * Flush all requests from the request/pending queue of an AP device. |
1534c382 | 1393 | */ |
4d284cac | 1394 | static void __ap_flush_queue(struct ap_device *ap_dev) |
1534c382 MS |
1395 | { |
1396 | struct ap_message *ap_msg, *next; | |
1397 | ||
1398 | list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) { | |
1399 | list_del_init(&ap_msg->list); | |
1400 | ap_dev->pendingq_count--; | |
f58fe336 MS |
1401 | ap_msg->rc = -EAGAIN; |
1402 | ap_msg->receive(ap_dev, ap_msg, NULL); | |
1534c382 MS |
1403 | } |
1404 | list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) { | |
1405 | list_del_init(&ap_msg->list); | |
1406 | ap_dev->requestq_count--; | |
f58fe336 MS |
1407 | ap_msg->rc = -EAGAIN; |
1408 | ap_msg->receive(ap_dev, ap_msg, NULL); | |
1534c382 MS |
1409 | } |
1410 | } | |
1411 | ||
1412 | void ap_flush_queue(struct ap_device *ap_dev) | |
1413 | { | |
1414 | spin_lock_bh(&ap_dev->lock); | |
1415 | __ap_flush_queue(ap_dev); | |
1416 | spin_unlock_bh(&ap_dev->lock); | |
1417 | } | |
1418 | EXPORT_SYMBOL(ap_flush_queue); | |
1419 | ||
1420 | static int ap_device_remove(struct device *dev) | |
1421 | { | |
1422 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1423 | struct ap_driver *ap_drv = ap_dev->drv; | |
1424 | ||
4e56296d | 1425 | ap_flush_queue(ap_dev); |
af512ed0 | 1426 | del_timer_sync(&ap_dev->timeout); |
43c207e6 | 1427 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 1428 | list_del_init(&ap_dev->list); |
43c207e6 | 1429 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca RW |
1430 | if (ap_drv->remove) |
1431 | ap_drv->remove(ap_dev); | |
e675c0d2 RW |
1432 | spin_lock_bh(&ap_dev->lock); |
1433 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
1434 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
1435 | return 0; |
1436 | } | |
1437 | ||
3f3007af MS |
1438 | static void ap_device_release(struct device *dev) |
1439 | { | |
1440 | kfree(to_ap_dev(dev)); | |
1441 | } | |
1442 | ||
1534c382 MS |
1443 | int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, |
1444 | char *name) | |
1445 | { | |
1446 | struct device_driver *drv = &ap_drv->driver; | |
1447 | ||
e387753c SS |
1448 | if (!initialised) |
1449 | return -ENODEV; | |
1450 | ||
1534c382 MS |
1451 | drv->bus = &ap_bus_type; |
1452 | drv->probe = ap_device_probe; | |
1453 | drv->remove = ap_device_remove; | |
1454 | drv->owner = owner; | |
1455 | drv->name = name; | |
1456 | return driver_register(drv); | |
1457 | } | |
1458 | EXPORT_SYMBOL(ap_driver_register); | |
1459 | ||
1460 | void ap_driver_unregister(struct ap_driver *ap_drv) | |
1461 | { | |
1462 | driver_unregister(&ap_drv->driver); | |
1463 | } | |
1464 | EXPORT_SYMBOL(ap_driver_unregister); | |
1465 | ||
dabecb29 HD |
1466 | void ap_bus_force_rescan(void) |
1467 | { | |
83e9d5d2 MS |
1468 | if (ap_suspend_flag) |
1469 | return; | |
56bbe686 | 1470 | /* processing a asynchronous bus rescan */ |
fcd0d1f6 | 1471 | del_timer(&ap_config_timer); |
8139b89d MS |
1472 | queue_work(system_long_wq, &ap_scan_work); |
1473 | flush_work(&ap_scan_work); | |
dabecb29 HD |
1474 | } |
1475 | EXPORT_SYMBOL(ap_bus_force_rescan); | |
1476 | ||
1749a81d | 1477 | /* |
1534c382 MS |
1478 | * AP bus attributes. |
1479 | */ | |
1480 | static ssize_t ap_domain_show(struct bus_type *bus, char *buf) | |
1481 | { | |
1482 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); | |
1483 | } | |
1484 | ||
fc1d3f02 IT |
1485 | static ssize_t ap_domain_store(struct bus_type *bus, |
1486 | const char *buf, size_t count) | |
1487 | { | |
1488 | int domain; | |
1489 | ||
1490 | if (sscanf(buf, "%i\n", &domain) != 1 || | |
1491 | domain < 0 || domain > ap_max_domain_id) | |
1492 | return -EINVAL; | |
1493 | spin_lock_bh(&ap_domain_lock); | |
1494 | ap_domain_index = domain; | |
1495 | spin_unlock_bh(&ap_domain_lock); | |
1496 | return count; | |
1497 | } | |
1498 | ||
1499 | static BUS_ATTR(ap_domain, 0644, ap_domain_show, ap_domain_store); | |
1534c382 | 1500 | |
91f3e3ea IT |
1501 | static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf) |
1502 | { | |
889875a1 MS |
1503 | if (!ap_configuration) /* QCI not supported */ |
1504 | return snprintf(buf, PAGE_SIZE, "not supported\n"); | |
1505 | if (!test_facility(76)) | |
1506 | /* format 0 - 16 bit domain field */ | |
1507 | return snprintf(buf, PAGE_SIZE, "%08x%08x\n", | |
1508 | ap_configuration->adm[0], | |
1509 | ap_configuration->adm[1]); | |
1510 | /* format 1 - 256 bit domain field */ | |
1511 | return snprintf(buf, PAGE_SIZE, | |
1512 | "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", | |
91f3e3ea IT |
1513 | ap_configuration->adm[0], ap_configuration->adm[1], |
1514 | ap_configuration->adm[2], ap_configuration->adm[3], | |
1515 | ap_configuration->adm[4], ap_configuration->adm[5], | |
1516 | ap_configuration->adm[6], ap_configuration->adm[7]); | |
91f3e3ea IT |
1517 | } |
1518 | ||
1519 | static BUS_ATTR(ap_control_domain_mask, 0444, | |
1520 | ap_control_domain_mask_show, NULL); | |
1521 | ||
1534c382 MS |
1522 | static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) |
1523 | { | |
1524 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); | |
1525 | } | |
1526 | ||
cb17a636 FB |
1527 | static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) |
1528 | { | |
1529 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
1530 | ap_using_interrupts() ? 1 : 0); | |
1531 | } | |
1532 | ||
1533 | static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); | |
1534 | ||
1534c382 MS |
1535 | static ssize_t ap_config_time_store(struct bus_type *bus, |
1536 | const char *buf, size_t count) | |
1537 | { | |
1538 | int time; | |
1539 | ||
1540 | if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) | |
1541 | return -EINVAL; | |
1542 | ap_config_time = time; | |
fcd0d1f6 | 1543 | mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); |
1534c382 MS |
1544 | return count; |
1545 | } | |
1546 | ||
1547 | static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); | |
1548 | ||
1549 | static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) | |
1550 | { | |
1551 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); | |
1552 | } | |
1553 | ||
1554 | static ssize_t ap_poll_thread_store(struct bus_type *bus, | |
1555 | const char *buf, size_t count) | |
1556 | { | |
1557 | int flag, rc; | |
1558 | ||
1559 | if (sscanf(buf, "%d\n", &flag) != 1) | |
1560 | return -EINVAL; | |
1561 | if (flag) { | |
1562 | rc = ap_poll_thread_start(); | |
1563 | if (rc) | |
83e9d5d2 MS |
1564 | count = rc; |
1565 | } else | |
1534c382 MS |
1566 | ap_poll_thread_stop(); |
1567 | return count; | |
1568 | } | |
1569 | ||
1570 | static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); | |
1571 | ||
fe137230 FB |
1572 | static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) |
1573 | { | |
1574 | return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); | |
1575 | } | |
1576 | ||
1577 | static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, | |
1578 | size_t count) | |
1579 | { | |
1580 | unsigned long long time; | |
1581 | ktime_t hr_time; | |
1582 | ||
1583 | /* 120 seconds = maximum poll interval */ | |
cb17a636 FB |
1584 | if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || |
1585 | time > 120000000000ULL) | |
fe137230 FB |
1586 | return -EINVAL; |
1587 | poll_timeout = time; | |
1588 | hr_time = ktime_set(0, poll_timeout); | |
1589 | ||
8cc2af7c IT |
1590 | spin_lock_bh(&ap_poll_timer_lock); |
1591 | hrtimer_cancel(&ap_poll_timer); | |
1592 | hrtimer_set_expires(&ap_poll_timer, hr_time); | |
1593 | hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); | |
1594 | spin_unlock_bh(&ap_poll_timer_lock); | |
1595 | ||
fe137230 FB |
1596 | return count; |
1597 | } | |
1598 | ||
1599 | static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); | |
1600 | ||
5bc334bf IT |
1601 | static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf) |
1602 | { | |
889875a1 MS |
1603 | int max_domain_id; |
1604 | ||
1605 | if (ap_configuration) | |
1606 | max_domain_id = ap_max_domain_id ? : -1; | |
1607 | else | |
5bc334bf | 1608 | max_domain_id = 15; |
5bc334bf IT |
1609 | return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id); |
1610 | } | |
1611 | ||
1612 | static BUS_ATTR(ap_max_domain_id, 0444, ap_max_domain_id_show, NULL); | |
1613 | ||
1534c382 MS |
1614 | static struct bus_attribute *const ap_bus_attrs[] = { |
1615 | &bus_attr_ap_domain, | |
91f3e3ea | 1616 | &bus_attr_ap_control_domain_mask, |
1534c382 MS |
1617 | &bus_attr_config_time, |
1618 | &bus_attr_poll_thread, | |
cb17a636 | 1619 | &bus_attr_ap_interrupts, |
fe137230 | 1620 | &bus_attr_poll_timeout, |
5bc334bf | 1621 | &bus_attr_ap_max_domain_id, |
fe137230 | 1622 | NULL, |
1534c382 MS |
1623 | }; |
1624 | ||
1625 | /** | |
1749a81d FB |
1626 | * ap_select_domain(): Select an AP domain. |
1627 | * | |
1628 | * Pick one of the 16 AP domains. | |
1534c382 | 1629 | */ |
4d284cac | 1630 | static int ap_select_domain(void) |
1534c382 | 1631 | { |
6acbe21f MS |
1632 | int count, max_count, best_domain; |
1633 | struct ap_queue_status status; | |
1634 | int i, j; | |
1534c382 | 1635 | |
1749a81d | 1636 | /* |
1534c382 MS |
1637 | * We want to use a single domain. Either the one specified with |
1638 | * the "domain=" parameter or the domain with the maximum number | |
1639 | * of devices. | |
1640 | */ | |
fc1d3f02 IT |
1641 | spin_lock_bh(&ap_domain_lock); |
1642 | if (ap_domain_index >= 0) { | |
1534c382 | 1643 | /* Domain has already been selected. */ |
fc1d3f02 | 1644 | spin_unlock_bh(&ap_domain_lock); |
1534c382 | 1645 | return 0; |
fc1d3f02 | 1646 | } |
1534c382 MS |
1647 | best_domain = -1; |
1648 | max_count = 0; | |
1649 | for (i = 0; i < AP_DOMAINS; i++) { | |
75014550 HD |
1650 | if (!ap_test_config_domain(i)) |
1651 | continue; | |
1534c382 MS |
1652 | count = 0; |
1653 | for (j = 0; j < AP_DEVICES; j++) { | |
75014550 HD |
1654 | if (!ap_test_config_card_id(j)) |
1655 | continue; | |
6acbe21f MS |
1656 | status = ap_test_queue(AP_MKQID(j, i), NULL); |
1657 | if (status.response_code != AP_RESPONSE_NORMAL) | |
1534c382 MS |
1658 | continue; |
1659 | count++; | |
1660 | } | |
1661 | if (count > max_count) { | |
1662 | max_count = count; | |
1663 | best_domain = i; | |
1664 | } | |
1665 | } | |
1666 | if (best_domain >= 0){ | |
1667 | ap_domain_index = best_domain; | |
fc1d3f02 | 1668 | spin_unlock_bh(&ap_domain_lock); |
1534c382 MS |
1669 | return 0; |
1670 | } | |
fc1d3f02 | 1671 | spin_unlock_bh(&ap_domain_lock); |
1534c382 MS |
1672 | return -ENODEV; |
1673 | } | |
1674 | ||
1534c382 | 1675 | /** |
1749a81d FB |
1676 | * __ap_scan_bus(): Scan the AP bus. |
1677 | * @dev: Pointer to device | |
1678 | * @data: Pointer to data | |
1679 | * | |
1680 | * Scan the AP bus for new devices. | |
1534c382 MS |
1681 | */ |
1682 | static int __ap_scan_bus(struct device *dev, void *data) | |
1683 | { | |
1684 | return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data; | |
1685 | } | |
1686 | ||
4927b3f7 | 1687 | static void ap_scan_bus(struct work_struct *unused) |
1534c382 MS |
1688 | { |
1689 | struct ap_device *ap_dev; | |
1690 | struct device *dev; | |
1691 | ap_qid_t qid; | |
c50a160c | 1692 | int queue_depth = 0, device_type = 0; |
3f3007af MS |
1693 | unsigned int device_functions = 0; |
1694 | int rc, i, borked; | |
1534c382 | 1695 | |
75014550 | 1696 | ap_query_configuration(); |
83e9d5d2 | 1697 | if (ap_select_domain() != 0) |
fcd0d1f6 | 1698 | goto out; |
889875a1 | 1699 | |
fc1d3f02 IT |
1700 | |
1701 | spin_lock_bh(&ap_domain_lock); | |
1534c382 MS |
1702 | for (i = 0; i < AP_DEVICES; i++) { |
1703 | qid = AP_MKQID(i, ap_domain_index); | |
1704 | dev = bus_find_device(&ap_bus_type, NULL, | |
1705 | (void *)(unsigned long)qid, | |
1706 | __ap_scan_bus); | |
889875a1 MS |
1707 | rc = ap_query_queue(qid, &queue_depth, &device_type, |
1708 | &device_functions); | |
c6a48264 RW |
1709 | if (dev) { |
1710 | ap_dev = to_ap_dev(dev); | |
1711 | spin_lock_bh(&ap_dev->lock); | |
3f3007af MS |
1712 | if (rc == -ENODEV) |
1713 | ap_dev->state = AP_STATE_BORKED; | |
1714 | borked = ap_dev->state == AP_STATE_BORKED; | |
af512ed0 | 1715 | spin_unlock_bh(&ap_dev->lock); |
3f3007af MS |
1716 | if (borked) /* Remove broken device */ |
1717 | device_unregister(dev); | |
1534c382 | 1718 | put_device(dev); |
3f3007af MS |
1719 | if (!borked) |
1720 | continue; | |
1534c382 | 1721 | } |
1534c382 MS |
1722 | if (rc) |
1723 | continue; | |
1724 | ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL); | |
1725 | if (!ap_dev) | |
1726 | break; | |
1727 | ap_dev->qid = qid; | |
3f3007af MS |
1728 | ap_dev->state = AP_STATE_RESET_START; |
1729 | ap_dev->interrupt = AP_INTR_DISABLED; | |
1534c382 | 1730 | ap_dev->queue_depth = queue_depth; |
6acbe21f MS |
1731 | ap_dev->raw_hwtype = device_type; |
1732 | ap_dev->device_type = device_type; | |
b3e8652b HF |
1733 | /* CEX6 toleration: map to CEX5 */ |
1734 | if (device_type == AP_DEVICE_TYPE_CEX6) | |
1735 | ap_dev->device_type = AP_DEVICE_TYPE_CEX5; | |
6acbe21f | 1736 | ap_dev->functions = device_functions; |
1534c382 MS |
1737 | spin_lock_init(&ap_dev->lock); |
1738 | INIT_LIST_HEAD(&ap_dev->pendingq); | |
1739 | INIT_LIST_HEAD(&ap_dev->requestq); | |
cf352ce0 | 1740 | INIT_LIST_HEAD(&ap_dev->list); |
af512ed0 RW |
1741 | setup_timer(&ap_dev->timeout, ap_request_timeout, |
1742 | (unsigned long) ap_dev); | |
1e2076f4 | 1743 | |
1534c382 MS |
1744 | ap_dev->device.bus = &ap_bus_type; |
1745 | ap_dev->device.parent = ap_root_device; | |
3f3007af MS |
1746 | rc = dev_set_name(&ap_dev->device, "card%02x", |
1747 | AP_QID_DEVICE(ap_dev->qid)); | |
1748 | if (rc) { | |
edc44fa0 FB |
1749 | kfree(ap_dev); |
1750 | continue; | |
1751 | } | |
3f3007af MS |
1752 | /* Add to list of devices */ |
1753 | spin_lock_bh(&ap_device_list_lock); | |
1754 | list_add(&ap_dev->list, &ap_device_list); | |
1755 | spin_unlock_bh(&ap_device_list_lock); | |
1756 | /* Start with a device reset */ | |
1757 | spin_lock_bh(&ap_dev->lock); | |
1758 | ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_POLL)); | |
1759 | spin_unlock_bh(&ap_dev->lock); | |
1760 | /* Register device */ | |
1534c382 MS |
1761 | ap_dev->device.release = ap_device_release; |
1762 | rc = device_register(&ap_dev->device); | |
1763 | if (rc) { | |
3f3007af MS |
1764 | spin_lock_bh(&ap_dev->lock); |
1765 | list_del_init(&ap_dev->list); | |
1766 | spin_unlock_bh(&ap_dev->lock); | |
c6304933 | 1767 | put_device(&ap_dev->device); |
1534c382 MS |
1768 | continue; |
1769 | } | |
1770 | /* Add device attributes. */ | |
1771 | rc = sysfs_create_group(&ap_dev->device.kobj, | |
1772 | &ap_dev_attr_group); | |
3f3007af | 1773 | if (rc) { |
1534c382 | 1774 | device_unregister(&ap_dev->device); |
3f3007af MS |
1775 | continue; |
1776 | } | |
1534c382 | 1777 | } |
fc1d3f02 | 1778 | spin_unlock_bh(&ap_domain_lock); |
fcd0d1f6 MS |
1779 | out: |
1780 | mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); | |
1534c382 MS |
1781 | } |
1782 | ||
83e9d5d2 | 1783 | static void ap_config_timeout(unsigned long ptr) |
1534c382 | 1784 | { |
83e9d5d2 MS |
1785 | if (ap_suspend_flag) |
1786 | return; | |
8139b89d | 1787 | queue_work(system_long_wq, &ap_scan_work); |
1534c382 MS |
1788 | } |
1789 | ||
13e742ba RW |
1790 | static void ap_reset_domain(void) |
1791 | { | |
1792 | int i; | |
1793 | ||
889875a1 MS |
1794 | if (ap_domain_index == -1 || !ap_test_config_domain(ap_domain_index)) |
1795 | return; | |
1796 | for (i = 0; i < AP_DEVICES; i++) | |
1797 | ap_reset_queue(AP_MKQID(i, ap_domain_index)); | |
13e742ba RW |
1798 | } |
1799 | ||
1800 | static void ap_reset_all(void) | |
85eca850 RW |
1801 | { |
1802 | int i, j; | |
1803 | ||
170387a8 IT |
1804 | for (i = 0; i < AP_DOMAINS; i++) { |
1805 | if (!ap_test_config_domain(i)) | |
1806 | continue; | |
1807 | for (j = 0; j < AP_DEVICES; j++) { | |
1808 | if (!ap_test_config_card_id(j)) | |
1809 | continue; | |
85eca850 | 1810 | ap_reset_queue(AP_MKQID(j, i)); |
170387a8 IT |
1811 | } |
1812 | } | |
85eca850 RW |
1813 | } |
1814 | ||
1815 | static struct reset_call ap_reset_call = { | |
13e742ba | 1816 | .fn = ap_reset_all, |
85eca850 RW |
1817 | }; |
1818 | ||
1534c382 | 1819 | /** |
1749a81d FB |
1820 | * ap_module_init(): The module initialization code. |
1821 | * | |
1822 | * Initializes the module. | |
1534c382 MS |
1823 | */ |
1824 | int __init ap_module_init(void) | |
1825 | { | |
889875a1 | 1826 | int max_domain_id; |
1534c382 MS |
1827 | int rc, i; |
1828 | ||
889875a1 MS |
1829 | if (ap_instructions_available() != 0) { |
1830 | pr_warn("The hardware system does not support AP instructions\n"); | |
1831 | return -ENODEV; | |
1832 | } | |
1833 | ||
1834 | /* Get AP configuration data if available */ | |
1835 | ap_init_configuration(); | |
1836 | ||
1837 | if (ap_configuration) | |
1838 | max_domain_id = ap_max_domain_id ? : (AP_DOMAINS - 1); | |
1839 | else | |
1840 | max_domain_id = 15; | |
1841 | if (ap_domain_index < -1 || ap_domain_index > max_domain_id) { | |
1842 | pr_warn("%d is not a valid cryptographic domain\n", | |
1843 | ap_domain_index); | |
33c388b8 WY |
1844 | rc = -EINVAL; |
1845 | goto out_free; | |
1534c382 | 1846 | } |
5314af69 FB |
1847 | /* In resume callback we need to know if the user had set the domain. |
1848 | * If so, we can not just reset it. | |
1849 | */ | |
1850 | if (ap_domain_index >= 0) | |
1851 | user_set_domain = 1; | |
1852 | ||
cb17a636 | 1853 | if (ap_interrupts_available()) { |
f4eae94f MS |
1854 | rc = register_adapter_interrupt(&ap_airq); |
1855 | ap_airq_flag = (rc == 0); | |
cb17a636 FB |
1856 | } |
1857 | ||
85eca850 | 1858 | register_reset_call(&ap_reset_call); |
1534c382 MS |
1859 | |
1860 | /* Create /sys/bus/ap. */ | |
1861 | rc = bus_register(&ap_bus_type); | |
1862 | if (rc) | |
1863 | goto out; | |
1864 | for (i = 0; ap_bus_attrs[i]; i++) { | |
1865 | rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); | |
1866 | if (rc) | |
1867 | goto out_bus; | |
1868 | } | |
1869 | ||
1870 | /* Create /sys/devices/ap. */ | |
035da16f | 1871 | ap_root_device = root_device_register("ap"); |
ba8da213 | 1872 | rc = PTR_RET(ap_root_device); |
1534c382 MS |
1873 | if (rc) |
1874 | goto out_bus; | |
1875 | ||
1749a81d | 1876 | /* Setup the AP bus rescan timer. */ |
fcd0d1f6 | 1877 | setup_timer(&ap_config_timer, ap_config_timeout, 0); |
1534c382 | 1878 | |
3f3007af MS |
1879 | /* |
1880 | * Setup the high resultion poll timer. | |
fe137230 FB |
1881 | * If we are running under z/VM adjust polling to z/VM polling rate. |
1882 | */ | |
1883 | if (MACHINE_IS_VM) | |
1884 | poll_timeout = 1500000; | |
93521314 | 1885 | spin_lock_init(&ap_poll_timer_lock); |
fe137230 FB |
1886 | hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
1887 | ap_poll_timer.function = ap_poll_timeout; | |
1888 | ||
1534c382 MS |
1889 | /* Start the low priority AP bus poll thread. */ |
1890 | if (ap_thread_flag) { | |
1891 | rc = ap_poll_thread_start(); | |
1892 | if (rc) | |
1893 | goto out_work; | |
1894 | } | |
1895 | ||
83e9d5d2 MS |
1896 | rc = register_pm_notifier(&ap_power_notifier); |
1897 | if (rc) | |
1898 | goto out_pm; | |
1899 | ||
8139b89d | 1900 | queue_work(system_long_wq, &ap_scan_work); |
e387753c | 1901 | initialised = true; |
3f3007af | 1902 | |
1534c382 MS |
1903 | return 0; |
1904 | ||
83e9d5d2 MS |
1905 | out_pm: |
1906 | ap_poll_thread_stop(); | |
1534c382 | 1907 | out_work: |
fe137230 | 1908 | hrtimer_cancel(&ap_poll_timer); |
035da16f | 1909 | root_device_unregister(ap_root_device); |
1534c382 MS |
1910 | out_bus: |
1911 | while (i--) | |
1912 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1913 | bus_unregister(&ap_bus_type); | |
1914 | out: | |
85eca850 | 1915 | unregister_reset_call(&ap_reset_call); |
f4eae94f MS |
1916 | if (ap_using_interrupts()) |
1917 | unregister_adapter_interrupt(&ap_airq); | |
33c388b8 | 1918 | out_free: |
889875a1 | 1919 | kfree(ap_configuration); |
1534c382 MS |
1920 | return rc; |
1921 | } | |
1922 | ||
1534c382 | 1923 | /** |
1749a81d FB |
1924 | * ap_modules_exit(): The module termination code |
1925 | * | |
1926 | * Terminates the module. | |
1534c382 MS |
1927 | */ |
1928 | void ap_module_exit(void) | |
1929 | { | |
1930 | int i; | |
1534c382 | 1931 | |
e387753c | 1932 | initialised = false; |
13e742ba | 1933 | ap_reset_domain(); |
1534c382 MS |
1934 | ap_poll_thread_stop(); |
1935 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1936 | hrtimer_cancel(&ap_poll_timer); |
13e742ba | 1937 | tasklet_kill(&ap_tasklet); |
83e9d5d2 | 1938 | bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_devices_unregister); |
1534c382 MS |
1939 | for (i = 0; ap_bus_attrs[i]; i++) |
1940 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
83e9d5d2 | 1941 | unregister_pm_notifier(&ap_power_notifier); |
f60b8d44 | 1942 | root_device_unregister(ap_root_device); |
1534c382 | 1943 | bus_unregister(&ap_bus_type); |
889875a1 | 1944 | kfree(ap_configuration); |
85eca850 | 1945 | unregister_reset_call(&ap_reset_call); |
f4eae94f MS |
1946 | if (ap_using_interrupts()) |
1947 | unregister_adapter_interrupt(&ap_airq); | |
1534c382 MS |
1948 | } |
1949 | ||
1534c382 MS |
1950 | module_init(ap_module_init); |
1951 | module_exit(ap_module_exit); |