]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
62b74942 | 3 | * core function to access sclp interface |
1da177e4 | 4 | * |
62b74942 MH |
5 | * Copyright IBM Corp. 1999, 2009 |
6 | * | |
7 | * Author(s): Martin Peschke <mpeschke@de.ibm.com> | |
8 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
1da177e4 LT |
9 | */ |
10 | ||
052ff461 | 11 | #include <linux/kernel_stat.h> |
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/err.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/timer.h> | |
17 | #include <linux/reboot.h> | |
18 | #include <linux/jiffies.h> | |
b3d00c3b | 19 | #include <linux/init.h> |
62b74942 MH |
20 | #include <linux/suspend.h> |
21 | #include <linux/completion.h> | |
22 | #include <linux/platform_device.h> | |
052ff461 HC |
23 | #include <asm/types.h> |
24 | #include <asm/irq.h> | |
1da177e4 LT |
25 | |
26 | #include "sclp.h" | |
27 | ||
28 | #define SCLP_HEADER "sclp: " | |
29 | ||
1da177e4 LT |
30 | /* Lock to protect internal data consistency. */ |
31 | static DEFINE_SPINLOCK(sclp_lock); | |
32 | ||
d082d3ce | 33 | /* Mask of events that we can send to the sclp interface. */ |
1da177e4 LT |
34 | static sccb_mask_t sclp_receive_mask; |
35 | ||
d082d3ce | 36 | /* Mask of events that we can receive from the sclp interface. */ |
1da177e4 LT |
37 | static sccb_mask_t sclp_send_mask; |
38 | ||
39 | /* List of registered event listeners and senders. */ | |
40 | static struct list_head sclp_reg_list; | |
41 | ||
42 | /* List of queued requests. */ | |
43 | static struct list_head sclp_req_queue; | |
44 | ||
45 | /* Data for read and and init requests. */ | |
46 | static struct sclp_req sclp_read_req; | |
47 | static struct sclp_req sclp_init_req; | |
48 | static char sclp_read_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
49 | static char sclp_init_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
50 | ||
62b74942 MH |
51 | /* Suspend request */ |
52 | static DECLARE_COMPLETION(sclp_request_queue_flushed); | |
53 | ||
25b41a7b MS |
54 | /* Number of console pages to allocate, used by sclp_con.c and sclp_vt220.c */ |
55 | int sclp_console_pages = SCLP_CONSOLE_PAGES; | |
56 | /* Flag to indicate if buffer pages are dropped on buffer full condition */ | |
00fd2cb0 | 57 | int sclp_console_drop = 1; |
25b41a7b MS |
58 | /* Number of times the console dropped buffer pages */ |
59 | unsigned long sclp_console_full; | |
60 | ||
62b74942 MH |
61 | static void sclp_suspend_req_cb(struct sclp_req *req, void *data) |
62 | { | |
63 | complete(&sclp_request_queue_flushed); | |
64 | } | |
65 | ||
25b41a7b MS |
66 | static int __init sclp_setup_console_pages(char *str) |
67 | { | |
68 | int pages, rc; | |
69 | ||
70 | rc = kstrtoint(str, 0, &pages); | |
71 | if (!rc && pages >= SCLP_CONSOLE_PAGES) | |
72 | sclp_console_pages = pages; | |
73 | return 1; | |
74 | } | |
75 | ||
76 | __setup("sclp_con_pages=", sclp_setup_console_pages); | |
77 | ||
78 | static int __init sclp_setup_console_drop(char *str) | |
79 | { | |
80 | int drop, rc; | |
81 | ||
82 | rc = kstrtoint(str, 0, &drop); | |
00fd2cb0 PO |
83 | if (!rc) |
84 | sclp_console_drop = drop; | |
25b41a7b MS |
85 | return 1; |
86 | } | |
87 | ||
88 | __setup("sclp_con_drop=", sclp_setup_console_drop); | |
89 | ||
62b74942 MH |
90 | static struct sclp_req sclp_suspend_req; |
91 | ||
1da177e4 LT |
92 | /* Timer for request retries. */ |
93 | static struct timer_list sclp_request_timer; | |
94 | ||
9f0128f9 GS |
95 | /* Timer for queued requests. */ |
96 | static struct timer_list sclp_queue_timer; | |
97 | ||
1da177e4 LT |
98 | /* Internal state: is a request active at the sclp? */ |
99 | static volatile enum sclp_running_state_t { | |
100 | sclp_running_state_idle, | |
dbd8ae63 PO |
101 | sclp_running_state_running, |
102 | sclp_running_state_reset_pending | |
1da177e4 LT |
103 | } sclp_running_state = sclp_running_state_idle; |
104 | ||
105 | /* Internal state: is a read request pending? */ | |
106 | static volatile enum sclp_reading_state_t { | |
107 | sclp_reading_state_idle, | |
108 | sclp_reading_state_reading | |
109 | } sclp_reading_state = sclp_reading_state_idle; | |
110 | ||
111 | /* Internal state: is the driver currently serving requests? */ | |
112 | static volatile enum sclp_activation_state_t { | |
113 | sclp_activation_state_active, | |
114 | sclp_activation_state_deactivating, | |
115 | sclp_activation_state_inactive, | |
116 | sclp_activation_state_activating | |
117 | } sclp_activation_state = sclp_activation_state_active; | |
118 | ||
119 | /* Internal state: is an init mask request pending? */ | |
120 | static volatile enum sclp_mask_state_t { | |
121 | sclp_mask_state_idle, | |
122 | sclp_mask_state_initializing | |
123 | } sclp_mask_state = sclp_mask_state_idle; | |
124 | ||
62b74942 MH |
125 | /* Internal state: is the driver suspended? */ |
126 | static enum sclp_suspend_state_t { | |
127 | sclp_suspend_state_running, | |
128 | sclp_suspend_state_suspended, | |
129 | } sclp_suspend_state = sclp_suspend_state_running; | |
130 | ||
1da177e4 LT |
131 | /* Maximum retry counts */ |
132 | #define SCLP_INIT_RETRY 3 | |
133 | #define SCLP_MASK_RETRY 3 | |
1da177e4 LT |
134 | |
135 | /* Timeout intervals in seconds.*/ | |
25fab9eb | 136 | #define SCLP_BUSY_INTERVAL 10 |
dbd8ae63 | 137 | #define SCLP_RETRY_INTERVAL 30 |
1da177e4 | 138 | |
c9602ee7 | 139 | static void sclp_request_timeout(bool force_restart); |
1da177e4 | 140 | static void sclp_process_queue(void); |
364c8558 | 141 | static void __sclp_make_read_req(void); |
1da177e4 LT |
142 | static int sclp_init_mask(int calculate); |
143 | static int sclp_init(void); | |
144 | ||
1da177e4 | 145 | static void |
dbd8ae63 | 146 | __sclp_queue_read_req(void) |
1da177e4 | 147 | { |
dbd8ae63 PO |
148 | if (sclp_reading_state == sclp_reading_state_idle) { |
149 | sclp_reading_state = sclp_reading_state_reading; | |
150 | __sclp_make_read_req(); | |
151 | /* Add request to head of queue */ | |
152 | list_add(&sclp_read_req.list, &sclp_req_queue); | |
1da177e4 | 153 | } |
1da177e4 LT |
154 | } |
155 | ||
156 | /* Set up request retry timer. Called while sclp_lock is locked. */ | |
157 | static inline void | |
c9602ee7 | 158 | __sclp_set_request_timer(unsigned long time, void (*cb)(struct timer_list *)) |
1da177e4 LT |
159 | { |
160 | del_timer(&sclp_request_timer); | |
c9602ee7 | 161 | sclp_request_timer.function = (TIMER_FUNC_TYPE)cb; |
1da177e4 LT |
162 | sclp_request_timer.expires = jiffies + time; |
163 | add_timer(&sclp_request_timer); | |
164 | } | |
165 | ||
c9602ee7 KC |
166 | static void sclp_request_timeout_restart(struct timer_list *unused) |
167 | { | |
168 | sclp_request_timeout(true); | |
169 | } | |
170 | ||
171 | static void sclp_request_timeout_normal(struct timer_list *unused) | |
172 | { | |
173 | sclp_request_timeout(false); | |
174 | } | |
175 | ||
176 | /* Request timeout handler. Restart the request queue. If force_restart, | |
dbd8ae63 | 177 | * force restart of running request. */ |
c9602ee7 | 178 | static void sclp_request_timeout(bool force_restart) |
dbd8ae63 PO |
179 | { |
180 | unsigned long flags; | |
181 | ||
182 | spin_lock_irqsave(&sclp_lock, flags); | |
c9602ee7 | 183 | if (force_restart) { |
dbd8ae63 PO |
184 | if (sclp_running_state == sclp_running_state_running) { |
185 | /* Break running state and queue NOP read event request | |
186 | * to get a defined interface state. */ | |
187 | __sclp_queue_read_req(); | |
188 | sclp_running_state = sclp_running_state_idle; | |
189 | } | |
190 | } else { | |
191 | __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, | |
c9602ee7 | 192 | sclp_request_timeout_normal); |
dbd8ae63 PO |
193 | } |
194 | spin_unlock_irqrestore(&sclp_lock, flags); | |
195 | sclp_process_queue(); | |
196 | } | |
197 | ||
9f0128f9 GS |
198 | /* |
199 | * Returns the expire value in jiffies of the next pending request timeout, | |
200 | * if any. Needs to be called with sclp_lock. | |
201 | */ | |
202 | static unsigned long __sclp_req_queue_find_next_timeout(void) | |
203 | { | |
204 | unsigned long expires_next = 0; | |
205 | struct sclp_req *req; | |
206 | ||
207 | list_for_each_entry(req, &sclp_req_queue, list) { | |
208 | if (!req->queue_expires) | |
209 | continue; | |
210 | if (!expires_next || | |
211 | (time_before(req->queue_expires, expires_next))) | |
212 | expires_next = req->queue_expires; | |
213 | } | |
214 | return expires_next; | |
215 | } | |
216 | ||
217 | /* | |
218 | * Returns expired request, if any, and removes it from the list. | |
219 | */ | |
220 | static struct sclp_req *__sclp_req_queue_remove_expired_req(void) | |
221 | { | |
222 | unsigned long flags, now; | |
223 | struct sclp_req *req; | |
224 | ||
225 | spin_lock_irqsave(&sclp_lock, flags); | |
226 | now = jiffies; | |
227 | /* Don't need list_for_each_safe because we break out after list_del */ | |
228 | list_for_each_entry(req, &sclp_req_queue, list) { | |
229 | if (!req->queue_expires) | |
230 | continue; | |
231 | if (time_before_eq(req->queue_expires, now)) { | |
232 | if (req->status == SCLP_REQ_QUEUED) { | |
233 | req->status = SCLP_REQ_QUEUED_TIMEOUT; | |
234 | list_del(&req->list); | |
235 | goto out; | |
236 | } | |
237 | } | |
238 | } | |
239 | req = NULL; | |
240 | out: | |
241 | spin_unlock_irqrestore(&sclp_lock, flags); | |
242 | return req; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Timeout handler for queued requests. Removes request from list and | |
247 | * invokes callback. This timer can be set per request in situations where | |
248 | * waiting too long would be harmful to the system, e.g. during SE reboot. | |
249 | */ | |
c9602ee7 | 250 | static void sclp_req_queue_timeout(struct timer_list *unused) |
9f0128f9 GS |
251 | { |
252 | unsigned long flags, expires_next; | |
253 | struct sclp_req *req; | |
254 | ||
255 | do { | |
256 | req = __sclp_req_queue_remove_expired_req(); | |
257 | if (req && req->callback) | |
258 | req->callback(req, req->callback_data); | |
259 | } while (req); | |
260 | ||
261 | spin_lock_irqsave(&sclp_lock, flags); | |
262 | expires_next = __sclp_req_queue_find_next_timeout(); | |
263 | if (expires_next) | |
264 | mod_timer(&sclp_queue_timer, expires_next); | |
265 | spin_unlock_irqrestore(&sclp_lock, flags); | |
266 | } | |
267 | ||
1da177e4 LT |
268 | /* Try to start a request. Return zero if the request was successfully |
269 | * started or if it will be started at a later time. Return non-zero otherwise. | |
270 | * Called while sclp_lock is locked. */ | |
271 | static int | |
272 | __sclp_start_request(struct sclp_req *req) | |
273 | { | |
274 | int rc; | |
275 | ||
276 | if (sclp_running_state != sclp_running_state_idle) | |
277 | return 0; | |
278 | del_timer(&sclp_request_timer); | |
ab14de6c | 279 | rc = sclp_service_call(req->command, req->sccb); |
25fab9eb PO |
280 | req->start_count++; |
281 | ||
1da177e4 | 282 | if (rc == 0) { |
3ad2f3fb | 283 | /* Successfully started request */ |
1da177e4 LT |
284 | req->status = SCLP_REQ_RUNNING; |
285 | sclp_running_state = sclp_running_state_running; | |
286 | __sclp_set_request_timer(SCLP_RETRY_INTERVAL * HZ, | |
c9602ee7 | 287 | sclp_request_timeout_restart); |
1da177e4 LT |
288 | return 0; |
289 | } else if (rc == -EBUSY) { | |
290 | /* Try again later */ | |
291 | __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, | |
c9602ee7 | 292 | sclp_request_timeout_normal); |
1da177e4 LT |
293 | return 0; |
294 | } | |
295 | /* Request failed */ | |
296 | req->status = SCLP_REQ_FAILED; | |
297 | return rc; | |
298 | } | |
299 | ||
300 | /* Try to start queued requests. */ | |
301 | static void | |
302 | sclp_process_queue(void) | |
303 | { | |
304 | struct sclp_req *req; | |
305 | int rc; | |
306 | unsigned long flags; | |
307 | ||
308 | spin_lock_irqsave(&sclp_lock, flags); | |
309 | if (sclp_running_state != sclp_running_state_idle) { | |
310 | spin_unlock_irqrestore(&sclp_lock, flags); | |
311 | return; | |
312 | } | |
313 | del_timer(&sclp_request_timer); | |
314 | while (!list_empty(&sclp_req_queue)) { | |
315 | req = list_entry(sclp_req_queue.next, struct sclp_req, list); | |
62b74942 MH |
316 | if (!req->sccb) |
317 | goto do_post; | |
1da177e4 LT |
318 | rc = __sclp_start_request(req); |
319 | if (rc == 0) | |
320 | break; | |
dbd8ae63 PO |
321 | /* Request failed */ |
322 | if (req->start_count > 1) { | |
323 | /* Cannot abort already submitted request - could still | |
324 | * be active at the SCLP */ | |
325 | __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, | |
c9602ee7 | 326 | sclp_request_timeout_normal); |
dbd8ae63 PO |
327 | break; |
328 | } | |
62b74942 | 329 | do_post: |
dbd8ae63 | 330 | /* Post-processing for aborted request */ |
1da177e4 LT |
331 | list_del(&req->list); |
332 | if (req->callback) { | |
333 | spin_unlock_irqrestore(&sclp_lock, flags); | |
334 | req->callback(req, req->callback_data); | |
335 | spin_lock_irqsave(&sclp_lock, flags); | |
336 | } | |
337 | } | |
338 | spin_unlock_irqrestore(&sclp_lock, flags); | |
339 | } | |
340 | ||
62b74942 MH |
341 | static int __sclp_can_add_request(struct sclp_req *req) |
342 | { | |
343 | if (req == &sclp_suspend_req || req == &sclp_init_req) | |
344 | return 1; | |
345 | if (sclp_suspend_state != sclp_suspend_state_running) | |
346 | return 0; | |
347 | if (sclp_init_state != sclp_init_state_initialized) | |
348 | return 0; | |
349 | if (sclp_activation_state != sclp_activation_state_active) | |
350 | return 0; | |
351 | return 1; | |
352 | } | |
353 | ||
1da177e4 LT |
354 | /* Queue a new request. Return zero on success, non-zero otherwise. */ |
355 | int | |
356 | sclp_add_request(struct sclp_req *req) | |
357 | { | |
358 | unsigned long flags; | |
359 | int rc; | |
360 | ||
361 | spin_lock_irqsave(&sclp_lock, flags); | |
62b74942 | 362 | if (!__sclp_can_add_request(req)) { |
1da177e4 LT |
363 | spin_unlock_irqrestore(&sclp_lock, flags); |
364 | return -EIO; | |
365 | } | |
366 | req->status = SCLP_REQ_QUEUED; | |
367 | req->start_count = 0; | |
368 | list_add_tail(&req->list, &sclp_req_queue); | |
369 | rc = 0; | |
9f0128f9 GS |
370 | if (req->queue_timeout) { |
371 | req->queue_expires = jiffies + req->queue_timeout * HZ; | |
372 | if (!timer_pending(&sclp_queue_timer) || | |
373 | time_after(sclp_queue_timer.expires, req->queue_expires)) | |
374 | mod_timer(&sclp_queue_timer, req->queue_expires); | |
375 | } else | |
376 | req->queue_expires = 0; | |
1da177e4 | 377 | /* Start if request is first in list */ |
dbd8ae63 PO |
378 | if (sclp_running_state == sclp_running_state_idle && |
379 | req->list.prev == &sclp_req_queue) { | |
62b74942 MH |
380 | if (!req->sccb) { |
381 | list_del(&req->list); | |
382 | rc = -ENODATA; | |
383 | goto out; | |
384 | } | |
1da177e4 LT |
385 | rc = __sclp_start_request(req); |
386 | if (rc) | |
387 | list_del(&req->list); | |
388 | } | |
62b74942 | 389 | out: |
1da177e4 LT |
390 | spin_unlock_irqrestore(&sclp_lock, flags); |
391 | return rc; | |
392 | } | |
393 | ||
394 | EXPORT_SYMBOL(sclp_add_request); | |
395 | ||
396 | /* Dispatch events found in request buffer to registered listeners. Return 0 | |
397 | * if all events were dispatched, non-zero otherwise. */ | |
398 | static int | |
399 | sclp_dispatch_evbufs(struct sccb_header *sccb) | |
400 | { | |
401 | unsigned long flags; | |
402 | struct evbuf_header *evbuf; | |
403 | struct list_head *l; | |
404 | struct sclp_register *reg; | |
405 | int offset; | |
406 | int rc; | |
407 | ||
408 | spin_lock_irqsave(&sclp_lock, flags); | |
409 | rc = 0; | |
410 | for (offset = sizeof(struct sccb_header); offset < sccb->length; | |
411 | offset += evbuf->length) { | |
1da177e4 | 412 | evbuf = (struct evbuf_header *) ((addr_t) sccb + offset); |
e2e5a0f2 PO |
413 | /* Check for malformed hardware response */ |
414 | if (evbuf->length == 0) | |
415 | break; | |
416 | /* Search for event handler */ | |
1da177e4 LT |
417 | reg = NULL; |
418 | list_for_each(l, &sclp_reg_list) { | |
419 | reg = list_entry(l, struct sclp_register, list); | |
420 | if (reg->receive_mask & (1 << (32 - evbuf->type))) | |
421 | break; | |
422 | else | |
423 | reg = NULL; | |
424 | } | |
425 | if (reg && reg->receiver_fn) { | |
426 | spin_unlock_irqrestore(&sclp_lock, flags); | |
427 | reg->receiver_fn(evbuf); | |
428 | spin_lock_irqsave(&sclp_lock, flags); | |
429 | } else if (reg == NULL) | |
d06cbda6 | 430 | rc = -EOPNOTSUPP; |
1da177e4 LT |
431 | } |
432 | spin_unlock_irqrestore(&sclp_lock, flags); | |
433 | return rc; | |
434 | } | |
435 | ||
436 | /* Read event data request callback. */ | |
437 | static void | |
438 | sclp_read_cb(struct sclp_req *req, void *data) | |
439 | { | |
440 | unsigned long flags; | |
441 | struct sccb_header *sccb; | |
442 | ||
443 | sccb = (struct sccb_header *) req->sccb; | |
444 | if (req->status == SCLP_REQ_DONE && (sccb->response_code == 0x20 || | |
445 | sccb->response_code == 0x220)) | |
446 | sclp_dispatch_evbufs(sccb); | |
447 | spin_lock_irqsave(&sclp_lock, flags); | |
448 | sclp_reading_state = sclp_reading_state_idle; | |
449 | spin_unlock_irqrestore(&sclp_lock, flags); | |
450 | } | |
451 | ||
452 | /* Prepare read event data request. Called while sclp_lock is locked. */ | |
364c8558 | 453 | static void __sclp_make_read_req(void) |
1da177e4 LT |
454 | { |
455 | struct sccb_header *sccb; | |
456 | ||
457 | sccb = (struct sccb_header *) sclp_read_sccb; | |
458 | clear_page(sccb); | |
459 | memset(&sclp_read_req, 0, sizeof(struct sclp_req)); | |
ab14de6c | 460 | sclp_read_req.command = SCLP_CMDW_READ_EVENT_DATA; |
1da177e4 LT |
461 | sclp_read_req.status = SCLP_REQ_QUEUED; |
462 | sclp_read_req.start_count = 0; | |
463 | sclp_read_req.callback = sclp_read_cb; | |
464 | sclp_read_req.sccb = sccb; | |
465 | sccb->length = PAGE_SIZE; | |
466 | sccb->function_code = 0; | |
467 | sccb->control_mask[2] = 0x80; | |
468 | } | |
469 | ||
470 | /* Search request list for request with matching sccb. Return request if found, | |
471 | * NULL otherwise. Called while sclp_lock is locked. */ | |
472 | static inline struct sclp_req * | |
473 | __sclp_find_req(u32 sccb) | |
474 | { | |
475 | struct list_head *l; | |
476 | struct sclp_req *req; | |
477 | ||
478 | list_for_each(l, &sclp_req_queue) { | |
479 | req = list_entry(l, struct sclp_req, list); | |
480 | if (sccb == (u32) (addr_t) req->sccb) | |
481 | return req; | |
482 | } | |
483 | return NULL; | |
484 | } | |
485 | ||
486 | /* Handler for external interruption. Perform request post-processing. | |
487 | * Prepare read event data request if necessary. Start processing of next | |
488 | * request on queue. */ | |
fde15c3a | 489 | static void sclp_interrupt_handler(struct ext_code ext_code, |
f6649a7e | 490 | unsigned int param32, unsigned long param64) |
1da177e4 LT |
491 | { |
492 | struct sclp_req *req; | |
493 | u32 finished_sccb; | |
494 | u32 evbuf_pending; | |
495 | ||
420f42ec | 496 | inc_irq_stat(IRQEXT_SCP); |
1da177e4 | 497 | spin_lock(&sclp_lock); |
f6649a7e MS |
498 | finished_sccb = param32 & 0xfffffff8; |
499 | evbuf_pending = param32 & 0x3; | |
1da177e4 | 500 | if (finished_sccb) { |
dbd8ae63 PO |
501 | del_timer(&sclp_request_timer); |
502 | sclp_running_state = sclp_running_state_reset_pending; | |
1da177e4 LT |
503 | req = __sclp_find_req(finished_sccb); |
504 | if (req) { | |
505 | /* Request post-processing */ | |
506 | list_del(&req->list); | |
507 | req->status = SCLP_REQ_DONE; | |
508 | if (req->callback) { | |
509 | spin_unlock(&sclp_lock); | |
510 | req->callback(req, req->callback_data); | |
511 | spin_lock(&sclp_lock); | |
512 | } | |
513 | } | |
514 | sclp_running_state = sclp_running_state_idle; | |
515 | } | |
d082d3ce | 516 | if (evbuf_pending && |
dbd8ae63 PO |
517 | sclp_activation_state == sclp_activation_state_active) |
518 | __sclp_queue_read_req(); | |
1da177e4 LT |
519 | spin_unlock(&sclp_lock); |
520 | sclp_process_queue(); | |
521 | } | |
522 | ||
1da177e4 LT |
523 | /* Convert interval in jiffies to TOD ticks. */ |
524 | static inline u64 | |
525 | sclp_tod_from_jiffies(unsigned long jiffies) | |
526 | { | |
527 | return (u64) (jiffies / HZ) << 32; | |
528 | } | |
529 | ||
530 | /* Wait until a currently running request finished. Note: while this function | |
531 | * is running, no timers are served on the calling CPU. */ | |
532 | void | |
533 | sclp_sync_wait(void) | |
534 | { | |
934b2857 | 535 | unsigned long long old_tick; |
1f194a4c | 536 | unsigned long flags; |
1da177e4 LT |
537 | unsigned long cr0, cr0_sync; |
538 | u64 timeout; | |
c59d744b | 539 | int irq_context; |
1da177e4 LT |
540 | |
541 | /* We'll be disabling timer interrupts, so we need a custom timeout | |
542 | * mechanism */ | |
543 | timeout = 0; | |
544 | if (timer_pending(&sclp_request_timer)) { | |
545 | /* Get timeout TOD value */ | |
8c071b0f | 546 | timeout = get_tod_clock_fast() + |
1da177e4 LT |
547 | sclp_tod_from_jiffies(sclp_request_timer.expires - |
548 | jiffies); | |
549 | } | |
1f194a4c | 550 | local_irq_save(flags); |
1da177e4 | 551 | /* Prevent bottom half from executing once we force interrupts open */ |
c59d744b HC |
552 | irq_context = in_interrupt(); |
553 | if (!irq_context) | |
554 | local_bh_disable(); | |
1da177e4 | 555 | /* Enable service-signal interruption, disable timer interrupts */ |
934b2857 | 556 | old_tick = local_tick_disable(); |
1f194a4c | 557 | trace_hardirqs_on(); |
1da177e4 | 558 | __ctl_store(cr0, 0, 0); |
c2ab7282 HC |
559 | cr0_sync = cr0 & ~CR0_IRQ_SUBCLASS_MASK; |
560 | cr0_sync |= 1UL << (63 - 54); | |
1da177e4 | 561 | __ctl_load(cr0_sync, 0, 0); |
df9ee292 | 562 | __arch_local_irq_stosm(0x01); |
1da177e4 LT |
563 | /* Loop until driver state indicates finished request */ |
564 | while (sclp_running_state != sclp_running_state_idle) { | |
565 | /* Check for expired request timer */ | |
566 | if (timer_pending(&sclp_request_timer) && | |
8c071b0f | 567 | get_tod_clock_fast() > timeout && |
1da177e4 | 568 | del_timer(&sclp_request_timer)) |
c9602ee7 | 569 | sclp_request_timer.function((TIMER_DATA_TYPE)&sclp_request_timer); |
1da177e4 LT |
570 | cpu_relax(); |
571 | } | |
1f194a4c | 572 | local_irq_disable(); |
1da177e4 | 573 | __ctl_load(cr0, 0, 0); |
c59d744b HC |
574 | if (!irq_context) |
575 | _local_bh_enable(); | |
934b2857 | 576 | local_tick_enable(old_tick); |
1f194a4c | 577 | local_irq_restore(flags); |
1da177e4 | 578 | } |
1da177e4 LT |
579 | EXPORT_SYMBOL(sclp_sync_wait); |
580 | ||
581 | /* Dispatch changes in send and receive mask to registered listeners. */ | |
4d284cac | 582 | static void |
1da177e4 LT |
583 | sclp_dispatch_state_change(void) |
584 | { | |
585 | struct list_head *l; | |
586 | struct sclp_register *reg; | |
587 | unsigned long flags; | |
588 | sccb_mask_t receive_mask; | |
589 | sccb_mask_t send_mask; | |
590 | ||
591 | do { | |
592 | spin_lock_irqsave(&sclp_lock, flags); | |
593 | reg = NULL; | |
594 | list_for_each(l, &sclp_reg_list) { | |
595 | reg = list_entry(l, struct sclp_register, list); | |
d082d3ce PO |
596 | receive_mask = reg->send_mask & sclp_receive_mask; |
597 | send_mask = reg->receive_mask & sclp_send_mask; | |
1da177e4 LT |
598 | if (reg->sclp_receive_mask != receive_mask || |
599 | reg->sclp_send_mask != send_mask) { | |
600 | reg->sclp_receive_mask = receive_mask; | |
601 | reg->sclp_send_mask = send_mask; | |
602 | break; | |
603 | } else | |
604 | reg = NULL; | |
605 | } | |
606 | spin_unlock_irqrestore(&sclp_lock, flags); | |
607 | if (reg && reg->state_change_fn) | |
608 | reg->state_change_fn(reg); | |
609 | } while (reg); | |
610 | } | |
611 | ||
612 | struct sclp_statechangebuf { | |
613 | struct evbuf_header header; | |
614 | u8 validity_sclp_active_facility_mask : 1; | |
615 | u8 validity_sclp_receive_mask : 1; | |
616 | u8 validity_sclp_send_mask : 1; | |
617 | u8 validity_read_data_function_mask : 1; | |
618 | u16 _zeros : 12; | |
619 | u16 mask_length; | |
620 | u64 sclp_active_facility_mask; | |
621 | sccb_mask_t sclp_receive_mask; | |
622 | sccb_mask_t sclp_send_mask; | |
623 | u32 read_data_function_mask; | |
624 | } __attribute__((packed)); | |
625 | ||
626 | ||
627 | /* State change event callback. Inform listeners of changes. */ | |
628 | static void | |
629 | sclp_state_change_cb(struct evbuf_header *evbuf) | |
630 | { | |
631 | unsigned long flags; | |
632 | struct sclp_statechangebuf *scbuf; | |
633 | ||
634 | scbuf = (struct sclp_statechangebuf *) evbuf; | |
635 | if (scbuf->mask_length != sizeof(sccb_mask_t)) | |
636 | return; | |
637 | spin_lock_irqsave(&sclp_lock, flags); | |
638 | if (scbuf->validity_sclp_receive_mask) | |
639 | sclp_receive_mask = scbuf->sclp_receive_mask; | |
640 | if (scbuf->validity_sclp_send_mask) | |
641 | sclp_send_mask = scbuf->sclp_send_mask; | |
642 | spin_unlock_irqrestore(&sclp_lock, flags); | |
887d935a | 643 | if (scbuf->validity_sclp_active_facility_mask) |
78335a30 | 644 | sclp.facilities = scbuf->sclp_active_facility_mask; |
1da177e4 LT |
645 | sclp_dispatch_state_change(); |
646 | } | |
647 | ||
648 | static struct sclp_register sclp_state_change_event = { | |
6d4740c8 | 649 | .receive_mask = EVTYP_STATECHANGE_MASK, |
1da177e4 LT |
650 | .receiver_fn = sclp_state_change_cb |
651 | }; | |
652 | ||
653 | /* Calculate receive and send mask of currently registered listeners. | |
654 | * Called while sclp_lock is locked. */ | |
655 | static inline void | |
656 | __sclp_get_mask(sccb_mask_t *receive_mask, sccb_mask_t *send_mask) | |
657 | { | |
658 | struct list_head *l; | |
659 | struct sclp_register *t; | |
660 | ||
661 | *receive_mask = 0; | |
662 | *send_mask = 0; | |
663 | list_for_each(l, &sclp_reg_list) { | |
664 | t = list_entry(l, struct sclp_register, list); | |
665 | *receive_mask |= t->receive_mask; | |
666 | *send_mask |= t->send_mask; | |
667 | } | |
668 | } | |
669 | ||
670 | /* Register event listener. Return 0 on success, non-zero otherwise. */ | |
671 | int | |
672 | sclp_register(struct sclp_register *reg) | |
673 | { | |
674 | unsigned long flags; | |
675 | sccb_mask_t receive_mask; | |
676 | sccb_mask_t send_mask; | |
677 | int rc; | |
678 | ||
679 | rc = sclp_init(); | |
680 | if (rc) | |
681 | return rc; | |
682 | spin_lock_irqsave(&sclp_lock, flags); | |
683 | /* Check event mask for collisions */ | |
684 | __sclp_get_mask(&receive_mask, &send_mask); | |
685 | if (reg->receive_mask & receive_mask || reg->send_mask & send_mask) { | |
686 | spin_unlock_irqrestore(&sclp_lock, flags); | |
687 | return -EBUSY; | |
688 | } | |
689 | /* Trigger initial state change callback */ | |
690 | reg->sclp_receive_mask = 0; | |
691 | reg->sclp_send_mask = 0; | |
62b74942 | 692 | reg->pm_event_posted = 0; |
1da177e4 LT |
693 | list_add(®->list, &sclp_reg_list); |
694 | spin_unlock_irqrestore(&sclp_lock, flags); | |
695 | rc = sclp_init_mask(1); | |
696 | if (rc) { | |
697 | spin_lock_irqsave(&sclp_lock, flags); | |
698 | list_del(®->list); | |
699 | spin_unlock_irqrestore(&sclp_lock, flags); | |
700 | } | |
701 | return rc; | |
702 | } | |
703 | ||
704 | EXPORT_SYMBOL(sclp_register); | |
705 | ||
706 | /* Unregister event listener. */ | |
707 | void | |
708 | sclp_unregister(struct sclp_register *reg) | |
709 | { | |
710 | unsigned long flags; | |
711 | ||
712 | spin_lock_irqsave(&sclp_lock, flags); | |
713 | list_del(®->list); | |
714 | spin_unlock_irqrestore(&sclp_lock, flags); | |
715 | sclp_init_mask(1); | |
716 | } | |
717 | ||
718 | EXPORT_SYMBOL(sclp_unregister); | |
719 | ||
720 | /* Remove event buffers which are marked processed. Return the number of | |
721 | * remaining event buffers. */ | |
722 | int | |
723 | sclp_remove_processed(struct sccb_header *sccb) | |
724 | { | |
725 | struct evbuf_header *evbuf; | |
726 | int unprocessed; | |
727 | u16 remaining; | |
728 | ||
729 | evbuf = (struct evbuf_header *) (sccb + 1); | |
730 | unprocessed = 0; | |
731 | remaining = sccb->length - sizeof(struct sccb_header); | |
732 | while (remaining > 0) { | |
733 | remaining -= evbuf->length; | |
734 | if (evbuf->flags & 0x80) { | |
735 | sccb->length -= evbuf->length; | |
736 | memcpy(evbuf, (void *) ((addr_t) evbuf + evbuf->length), | |
737 | remaining); | |
738 | } else { | |
739 | unprocessed++; | |
740 | evbuf = (struct evbuf_header *) | |
741 | ((addr_t) evbuf + evbuf->length); | |
742 | } | |
743 | } | |
744 | return unprocessed; | |
745 | } | |
746 | ||
747 | EXPORT_SYMBOL(sclp_remove_processed); | |
748 | ||
1da177e4 LT |
749 | /* Prepare init mask request. Called while sclp_lock is locked. */ |
750 | static inline void | |
751 | __sclp_make_init_req(u32 receive_mask, u32 send_mask) | |
752 | { | |
753 | struct init_sccb *sccb; | |
754 | ||
755 | sccb = (struct init_sccb *) sclp_init_sccb; | |
756 | clear_page(sccb); | |
757 | memset(&sclp_init_req, 0, sizeof(struct sclp_req)); | |
ab14de6c | 758 | sclp_init_req.command = SCLP_CMDW_WRITE_EVENT_MASK; |
1da177e4 LT |
759 | sclp_init_req.status = SCLP_REQ_FILLED; |
760 | sclp_init_req.start_count = 0; | |
761 | sclp_init_req.callback = NULL; | |
762 | sclp_init_req.callback_data = NULL; | |
763 | sclp_init_req.sccb = sccb; | |
764 | sccb->header.length = sizeof(struct init_sccb); | |
765 | sccb->mask_length = sizeof(sccb_mask_t); | |
766 | sccb->receive_mask = receive_mask; | |
767 | sccb->send_mask = send_mask; | |
768 | sccb->sclp_receive_mask = 0; | |
769 | sccb->sclp_send_mask = 0; | |
770 | } | |
771 | ||
772 | /* Start init mask request. If calculate is non-zero, calculate the mask as | |
773 | * requested by registered listeners. Use zero mask otherwise. Return 0 on | |
774 | * success, non-zero otherwise. */ | |
775 | static int | |
776 | sclp_init_mask(int calculate) | |
777 | { | |
778 | unsigned long flags; | |
779 | struct init_sccb *sccb = (struct init_sccb *) sclp_init_sccb; | |
780 | sccb_mask_t receive_mask; | |
781 | sccb_mask_t send_mask; | |
782 | int retry; | |
783 | int rc; | |
784 | unsigned long wait; | |
785 | ||
786 | spin_lock_irqsave(&sclp_lock, flags); | |
787 | /* Check if interface is in appropriate state */ | |
788 | if (sclp_mask_state != sclp_mask_state_idle) { | |
789 | spin_unlock_irqrestore(&sclp_lock, flags); | |
790 | return -EBUSY; | |
791 | } | |
792 | if (sclp_activation_state == sclp_activation_state_inactive) { | |
793 | spin_unlock_irqrestore(&sclp_lock, flags); | |
794 | return -EINVAL; | |
795 | } | |
796 | sclp_mask_state = sclp_mask_state_initializing; | |
797 | /* Determine mask */ | |
798 | if (calculate) | |
799 | __sclp_get_mask(&receive_mask, &send_mask); | |
800 | else { | |
801 | receive_mask = 0; | |
802 | send_mask = 0; | |
803 | } | |
804 | rc = -EIO; | |
805 | for (retry = 0; retry <= SCLP_MASK_RETRY; retry++) { | |
806 | /* Prepare request */ | |
807 | __sclp_make_init_req(receive_mask, send_mask); | |
808 | spin_unlock_irqrestore(&sclp_lock, flags); | |
809 | if (sclp_add_request(&sclp_init_req)) { | |
810 | /* Try again later */ | |
811 | wait = jiffies + SCLP_BUSY_INTERVAL * HZ; | |
812 | while (time_before(jiffies, wait)) | |
813 | sclp_sync_wait(); | |
814 | spin_lock_irqsave(&sclp_lock, flags); | |
815 | continue; | |
816 | } | |
817 | while (sclp_init_req.status != SCLP_REQ_DONE && | |
818 | sclp_init_req.status != SCLP_REQ_FAILED) | |
819 | sclp_sync_wait(); | |
820 | spin_lock_irqsave(&sclp_lock, flags); | |
821 | if (sclp_init_req.status == SCLP_REQ_DONE && | |
822 | sccb->header.response_code == 0x20) { | |
823 | /* Successful request */ | |
824 | if (calculate) { | |
825 | sclp_receive_mask = sccb->sclp_receive_mask; | |
826 | sclp_send_mask = sccb->sclp_send_mask; | |
827 | } else { | |
828 | sclp_receive_mask = 0; | |
829 | sclp_send_mask = 0; | |
830 | } | |
831 | spin_unlock_irqrestore(&sclp_lock, flags); | |
832 | sclp_dispatch_state_change(); | |
833 | spin_lock_irqsave(&sclp_lock, flags); | |
834 | rc = 0; | |
835 | break; | |
836 | } | |
837 | } | |
838 | sclp_mask_state = sclp_mask_state_idle; | |
839 | spin_unlock_irqrestore(&sclp_lock, flags); | |
840 | return rc; | |
841 | } | |
842 | ||
843 | /* Deactivate SCLP interface. On success, new requests will be rejected, | |
844 | * events will no longer be dispatched. Return 0 on success, non-zero | |
845 | * otherwise. */ | |
846 | int | |
847 | sclp_deactivate(void) | |
848 | { | |
849 | unsigned long flags; | |
850 | int rc; | |
851 | ||
852 | spin_lock_irqsave(&sclp_lock, flags); | |
853 | /* Deactivate can only be called when active */ | |
854 | if (sclp_activation_state != sclp_activation_state_active) { | |
855 | spin_unlock_irqrestore(&sclp_lock, flags); | |
856 | return -EINVAL; | |
857 | } | |
858 | sclp_activation_state = sclp_activation_state_deactivating; | |
859 | spin_unlock_irqrestore(&sclp_lock, flags); | |
860 | rc = sclp_init_mask(0); | |
861 | spin_lock_irqsave(&sclp_lock, flags); | |
862 | if (rc == 0) | |
863 | sclp_activation_state = sclp_activation_state_inactive; | |
864 | else | |
865 | sclp_activation_state = sclp_activation_state_active; | |
866 | spin_unlock_irqrestore(&sclp_lock, flags); | |
867 | return rc; | |
868 | } | |
869 | ||
870 | EXPORT_SYMBOL(sclp_deactivate); | |
871 | ||
872 | /* Reactivate SCLP interface after sclp_deactivate. On success, new | |
873 | * requests will be accepted, events will be dispatched again. Return 0 on | |
874 | * success, non-zero otherwise. */ | |
875 | int | |
876 | sclp_reactivate(void) | |
877 | { | |
878 | unsigned long flags; | |
879 | int rc; | |
880 | ||
881 | spin_lock_irqsave(&sclp_lock, flags); | |
882 | /* Reactivate can only be called when inactive */ | |
883 | if (sclp_activation_state != sclp_activation_state_inactive) { | |
884 | spin_unlock_irqrestore(&sclp_lock, flags); | |
885 | return -EINVAL; | |
886 | } | |
887 | sclp_activation_state = sclp_activation_state_activating; | |
888 | spin_unlock_irqrestore(&sclp_lock, flags); | |
889 | rc = sclp_init_mask(1); | |
890 | spin_lock_irqsave(&sclp_lock, flags); | |
891 | if (rc == 0) | |
892 | sclp_activation_state = sclp_activation_state_active; | |
893 | else | |
894 | sclp_activation_state = sclp_activation_state_inactive; | |
895 | spin_unlock_irqrestore(&sclp_lock, flags); | |
896 | return rc; | |
897 | } | |
898 | ||
899 | EXPORT_SYMBOL(sclp_reactivate); | |
900 | ||
901 | /* Handler for external interruption used during initialization. Modify | |
902 | * request state to done. */ | |
fde15c3a | 903 | static void sclp_check_handler(struct ext_code ext_code, |
f6649a7e | 904 | unsigned int param32, unsigned long param64) |
1da177e4 LT |
905 | { |
906 | u32 finished_sccb; | |
907 | ||
420f42ec | 908 | inc_irq_stat(IRQEXT_SCP); |
f6649a7e | 909 | finished_sccb = param32 & 0xfffffff8; |
1da177e4 LT |
910 | /* Is this the interrupt we are waiting for? */ |
911 | if (finished_sccb == 0) | |
912 | return; | |
a12c53f4 MS |
913 | if (finished_sccb != (u32) (addr_t) sclp_init_sccb) |
914 | panic("sclp: unsolicited interrupt for buffer at 0x%x\n", | |
915 | finished_sccb); | |
1da177e4 LT |
916 | spin_lock(&sclp_lock); |
917 | if (sclp_running_state == sclp_running_state_running) { | |
918 | sclp_init_req.status = SCLP_REQ_DONE; | |
919 | sclp_running_state = sclp_running_state_idle; | |
920 | } | |
921 | spin_unlock(&sclp_lock); | |
922 | } | |
923 | ||
924 | /* Initial init mask request timed out. Modify request state to failed. */ | |
925 | static void | |
c9602ee7 | 926 | sclp_check_timeout(struct timer_list *unused) |
1da177e4 LT |
927 | { |
928 | unsigned long flags; | |
929 | ||
930 | spin_lock_irqsave(&sclp_lock, flags); | |
931 | if (sclp_running_state == sclp_running_state_running) { | |
932 | sclp_init_req.status = SCLP_REQ_FAILED; | |
933 | sclp_running_state = sclp_running_state_idle; | |
934 | } | |
935 | spin_unlock_irqrestore(&sclp_lock, flags); | |
936 | } | |
937 | ||
938 | /* Perform a check of the SCLP interface. Return zero if the interface is | |
939 | * available and there are no pending requests from a previous instance. | |
940 | * Return non-zero otherwise. */ | |
941 | static int | |
942 | sclp_check_interface(void) | |
943 | { | |
944 | struct init_sccb *sccb; | |
945 | unsigned long flags; | |
946 | int retry; | |
947 | int rc; | |
948 | ||
949 | spin_lock_irqsave(&sclp_lock, flags); | |
950 | /* Prepare init mask command */ | |
1dad093b | 951 | rc = register_external_irq(EXT_IRQ_SERVICE_SIG, sclp_check_handler); |
1da177e4 LT |
952 | if (rc) { |
953 | spin_unlock_irqrestore(&sclp_lock, flags); | |
954 | return rc; | |
955 | } | |
956 | for (retry = 0; retry <= SCLP_INIT_RETRY; retry++) { | |
957 | __sclp_make_init_req(0, 0); | |
958 | sccb = (struct init_sccb *) sclp_init_req.sccb; | |
ab14de6c | 959 | rc = sclp_service_call(sclp_init_req.command, sccb); |
1da177e4 LT |
960 | if (rc == -EIO) |
961 | break; | |
962 | sclp_init_req.status = SCLP_REQ_RUNNING; | |
963 | sclp_running_state = sclp_running_state_running; | |
964 | __sclp_set_request_timer(SCLP_RETRY_INTERVAL * HZ, | |
c9602ee7 | 965 | sclp_check_timeout); |
1da177e4 LT |
966 | spin_unlock_irqrestore(&sclp_lock, flags); |
967 | /* Enable service-signal interruption - needs to happen | |
968 | * with IRQs enabled. */ | |
82003c3e | 969 | irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); |
1da177e4 LT |
970 | /* Wait for signal from interrupt or timeout */ |
971 | sclp_sync_wait(); | |
972 | /* Disable service-signal interruption - needs to happen | |
973 | * with IRQs enabled. */ | |
82003c3e | 974 | irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL); |
1da177e4 LT |
975 | spin_lock_irqsave(&sclp_lock, flags); |
976 | del_timer(&sclp_request_timer); | |
977 | if (sclp_init_req.status == SCLP_REQ_DONE && | |
978 | sccb->header.response_code == 0x20) { | |
979 | rc = 0; | |
980 | break; | |
981 | } else | |
982 | rc = -EBUSY; | |
983 | } | |
1dad093b | 984 | unregister_external_irq(EXT_IRQ_SERVICE_SIG, sclp_check_handler); |
1da177e4 LT |
985 | spin_unlock_irqrestore(&sclp_lock, flags); |
986 | return rc; | |
987 | } | |
988 | ||
989 | /* Reboot event handler. Reset send and receive mask to prevent pending SCLP | |
990 | * events from interfering with rebooted system. */ | |
991 | static int | |
992 | sclp_reboot_event(struct notifier_block *this, unsigned long event, void *ptr) | |
993 | { | |
994 | sclp_deactivate(); | |
995 | return NOTIFY_DONE; | |
996 | } | |
997 | ||
998 | static struct notifier_block sclp_reboot_notifier = { | |
999 | .notifier_call = sclp_reboot_event | |
1000 | }; | |
1001 | ||
62b74942 MH |
1002 | /* |
1003 | * Suspend/resume SCLP notifier implementation | |
1004 | */ | |
1005 | ||
1006 | static void sclp_pm_event(enum sclp_pm_event sclp_pm_event, int rollback) | |
1007 | { | |
1008 | struct sclp_register *reg; | |
1009 | unsigned long flags; | |
1010 | ||
1011 | if (!rollback) { | |
1012 | spin_lock_irqsave(&sclp_lock, flags); | |
1013 | list_for_each_entry(reg, &sclp_reg_list, list) | |
1014 | reg->pm_event_posted = 0; | |
1015 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1016 | } | |
1017 | do { | |
1018 | spin_lock_irqsave(&sclp_lock, flags); | |
1019 | list_for_each_entry(reg, &sclp_reg_list, list) { | |
1020 | if (rollback && reg->pm_event_posted) | |
1021 | goto found; | |
1022 | if (!rollback && !reg->pm_event_posted) | |
1023 | goto found; | |
1024 | } | |
1025 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1026 | return; | |
1027 | found: | |
1028 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1029 | if (reg->pm_event_fn) | |
1030 | reg->pm_event_fn(reg, sclp_pm_event); | |
1031 | reg->pm_event_posted = rollback ? 0 : 1; | |
1032 | } while (1); | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * Susend/resume callbacks for platform device | |
1037 | */ | |
1038 | ||
1039 | static int sclp_freeze(struct device *dev) | |
1040 | { | |
1041 | unsigned long flags; | |
1042 | int rc; | |
1043 | ||
1044 | sclp_pm_event(SCLP_PM_EVENT_FREEZE, 0); | |
1045 | ||
1046 | spin_lock_irqsave(&sclp_lock, flags); | |
1047 | sclp_suspend_state = sclp_suspend_state_suspended; | |
1048 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1049 | ||
1050 | /* Init supend data */ | |
1051 | memset(&sclp_suspend_req, 0, sizeof(sclp_suspend_req)); | |
1052 | sclp_suspend_req.callback = sclp_suspend_req_cb; | |
1053 | sclp_suspend_req.status = SCLP_REQ_FILLED; | |
1054 | init_completion(&sclp_request_queue_flushed); | |
1055 | ||
1056 | rc = sclp_add_request(&sclp_suspend_req); | |
1057 | if (rc == 0) | |
1058 | wait_for_completion(&sclp_request_queue_flushed); | |
1059 | else if (rc != -ENODATA) | |
1060 | goto fail_thaw; | |
1061 | ||
1062 | rc = sclp_deactivate(); | |
1063 | if (rc) | |
1064 | goto fail_thaw; | |
1065 | return 0; | |
1066 | ||
1067 | fail_thaw: | |
1068 | spin_lock_irqsave(&sclp_lock, flags); | |
1069 | sclp_suspend_state = sclp_suspend_state_running; | |
1070 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1071 | sclp_pm_event(SCLP_PM_EVENT_THAW, 1); | |
1072 | return rc; | |
1073 | } | |
1074 | ||
1075 | static int sclp_undo_suspend(enum sclp_pm_event event) | |
1076 | { | |
1077 | unsigned long flags; | |
1078 | int rc; | |
1079 | ||
1080 | rc = sclp_reactivate(); | |
1081 | if (rc) | |
1082 | return rc; | |
1083 | ||
1084 | spin_lock_irqsave(&sclp_lock, flags); | |
1085 | sclp_suspend_state = sclp_suspend_state_running; | |
1086 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1087 | ||
1088 | sclp_pm_event(event, 0); | |
1089 | return 0; | |
1090 | } | |
1091 | ||
1092 | static int sclp_thaw(struct device *dev) | |
1093 | { | |
1094 | return sclp_undo_suspend(SCLP_PM_EVENT_THAW); | |
1095 | } | |
1096 | ||
1097 | static int sclp_restore(struct device *dev) | |
1098 | { | |
1099 | return sclp_undo_suspend(SCLP_PM_EVENT_RESTORE); | |
1100 | } | |
1101 | ||
47145210 | 1102 | static const struct dev_pm_ops sclp_pm_ops = { |
62b74942 MH |
1103 | .freeze = sclp_freeze, |
1104 | .thaw = sclp_thaw, | |
1105 | .restore = sclp_restore, | |
1106 | }; | |
1107 | ||
36369569 | 1108 | static ssize_t con_pages_show(struct device_driver *dev, char *buf) |
25b41a7b MS |
1109 | { |
1110 | return sprintf(buf, "%i\n", sclp_console_pages); | |
1111 | } | |
1112 | ||
36369569 | 1113 | static DRIVER_ATTR_RO(con_pages); |
25b41a7b | 1114 | |
36369569 | 1115 | static ssize_t con_drop_show(struct device_driver *dev, char *buf) |
25b41a7b MS |
1116 | { |
1117 | return sprintf(buf, "%i\n", sclp_console_drop); | |
1118 | } | |
1119 | ||
36369569 | 1120 | static DRIVER_ATTR_RO(con_drop); |
25b41a7b | 1121 | |
36369569 | 1122 | static ssize_t con_full_show(struct device_driver *dev, char *buf) |
25b41a7b MS |
1123 | { |
1124 | return sprintf(buf, "%lu\n", sclp_console_full); | |
1125 | } | |
1126 | ||
36369569 | 1127 | static DRIVER_ATTR_RO(con_full); |
25b41a7b MS |
1128 | |
1129 | static struct attribute *sclp_drv_attrs[] = { | |
1130 | &driver_attr_con_pages.attr, | |
1131 | &driver_attr_con_drop.attr, | |
1132 | &driver_attr_con_full.attr, | |
1133 | NULL, | |
1134 | }; | |
1135 | static struct attribute_group sclp_drv_attr_group = { | |
1136 | .attrs = sclp_drv_attrs, | |
1137 | }; | |
1138 | static const struct attribute_group *sclp_drv_attr_groups[] = { | |
1139 | &sclp_drv_attr_group, | |
1140 | NULL, | |
1141 | }; | |
1142 | ||
62b74942 MH |
1143 | static struct platform_driver sclp_pdrv = { |
1144 | .driver = { | |
1145 | .name = "sclp", | |
62b74942 | 1146 | .pm = &sclp_pm_ops, |
25b41a7b | 1147 | .groups = sclp_drv_attr_groups, |
62b74942 MH |
1148 | }, |
1149 | }; | |
1150 | ||
1151 | static struct platform_device *sclp_pdev; | |
1152 | ||
1da177e4 LT |
1153 | /* Initialize SCLP driver. Return zero if driver is operational, non-zero |
1154 | * otherwise. */ | |
1155 | static int | |
1156 | sclp_init(void) | |
1157 | { | |
1158 | unsigned long flags; | |
62b74942 | 1159 | int rc = 0; |
1da177e4 | 1160 | |
1da177e4 LT |
1161 | spin_lock_irqsave(&sclp_lock, flags); |
1162 | /* Check for previous or running initialization */ | |
62b74942 MH |
1163 | if (sclp_init_state != sclp_init_state_uninitialized) |
1164 | goto fail_unlock; | |
1da177e4 LT |
1165 | sclp_init_state = sclp_init_state_initializing; |
1166 | /* Set up variables */ | |
1167 | INIT_LIST_HEAD(&sclp_req_queue); | |
1168 | INIT_LIST_HEAD(&sclp_reg_list); | |
1169 | list_add(&sclp_state_change_event.list, &sclp_reg_list); | |
c9602ee7 KC |
1170 | timer_setup(&sclp_request_timer, NULL, 0); |
1171 | timer_setup(&sclp_queue_timer, sclp_req_queue_timeout, 0); | |
1da177e4 LT |
1172 | /* Check interface */ |
1173 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1174 | rc = sclp_check_interface(); | |
1175 | spin_lock_irqsave(&sclp_lock, flags); | |
62b74942 MH |
1176 | if (rc) |
1177 | goto fail_init_state_uninitialized; | |
1da177e4 LT |
1178 | /* Register reboot handler */ |
1179 | rc = register_reboot_notifier(&sclp_reboot_notifier); | |
62b74942 MH |
1180 | if (rc) |
1181 | goto fail_init_state_uninitialized; | |
1da177e4 | 1182 | /* Register interrupt handler */ |
1dad093b | 1183 | rc = register_external_irq(EXT_IRQ_SERVICE_SIG, sclp_interrupt_handler); |
62b74942 MH |
1184 | if (rc) |
1185 | goto fail_unregister_reboot_notifier; | |
1da177e4 LT |
1186 | sclp_init_state = sclp_init_state_initialized; |
1187 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1188 | /* Enable service-signal external interruption - needs to happen with | |
1189 | * IRQs enabled. */ | |
82003c3e | 1190 | irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); |
1da177e4 LT |
1191 | sclp_init_mask(1); |
1192 | return 0; | |
62b74942 MH |
1193 | |
1194 | fail_unregister_reboot_notifier: | |
1195 | unregister_reboot_notifier(&sclp_reboot_notifier); | |
1196 | fail_init_state_uninitialized: | |
1197 | sclp_init_state = sclp_init_state_uninitialized; | |
1198 | fail_unlock: | |
1199 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1200 | return rc; | |
1da177e4 | 1201 | } |
b3d00c3b | 1202 | |
62b74942 MH |
1203 | /* |
1204 | * SCLP panic notifier: If we are suspended, we thaw SCLP in order to be able | |
1205 | * to print the panic message. | |
1206 | */ | |
1207 | static int sclp_panic_notify(struct notifier_block *self, | |
1208 | unsigned long event, void *data) | |
1209 | { | |
1210 | if (sclp_suspend_state == sclp_suspend_state_suspended) | |
1211 | sclp_undo_suspend(SCLP_PM_EVENT_THAW); | |
1212 | return NOTIFY_OK; | |
1213 | } | |
1214 | ||
1215 | static struct notifier_block sclp_on_panic_nb = { | |
1216 | .notifier_call = sclp_panic_notify, | |
1217 | .priority = SCLP_PANIC_PRIO, | |
1218 | }; | |
1219 | ||
b3d00c3b PO |
1220 | static __init int sclp_initcall(void) |
1221 | { | |
62b74942 MH |
1222 | int rc; |
1223 | ||
1224 | rc = platform_driver_register(&sclp_pdrv); | |
1225 | if (rc) | |
1226 | return rc; | |
25b41a7b | 1227 | |
62b74942 | 1228 | sclp_pdev = platform_device_register_simple("sclp", -1, NULL, 0); |
83d8e252 | 1229 | rc = PTR_ERR_OR_ZERO(sclp_pdev); |
62b74942 MH |
1230 | if (rc) |
1231 | goto fail_platform_driver_unregister; | |
25b41a7b | 1232 | |
62b74942 MH |
1233 | rc = atomic_notifier_chain_register(&panic_notifier_list, |
1234 | &sclp_on_panic_nb); | |
1235 | if (rc) | |
1236 | goto fail_platform_device_unregister; | |
1237 | ||
b3d00c3b | 1238 | return sclp_init(); |
62b74942 MH |
1239 | |
1240 | fail_platform_device_unregister: | |
1241 | platform_device_unregister(sclp_pdev); | |
1242 | fail_platform_driver_unregister: | |
1243 | platform_driver_unregister(&sclp_pdrv); | |
1244 | return rc; | |
b3d00c3b PO |
1245 | } |
1246 | ||
1247 | arch_initcall(sclp_initcall); |