Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
62b74942 | 2 | * core function to access sclp interface |
1da177e4 | 3 | * |
62b74942 MH |
4 | * Copyright IBM Corp. 1999, 2009 |
5 | * | |
6 | * Author(s): Martin Peschke <mpeschke@de.ibm.com> | |
7 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
1da177e4 LT |
8 | */ |
9 | ||
052ff461 | 10 | #include <linux/kernel_stat.h> |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/err.h> | |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/timer.h> | |
16 | #include <linux/reboot.h> | |
17 | #include <linux/jiffies.h> | |
b3d00c3b | 18 | #include <linux/init.h> |
62b74942 MH |
19 | #include <linux/suspend.h> |
20 | #include <linux/completion.h> | |
21 | #include <linux/platform_device.h> | |
052ff461 HC |
22 | #include <asm/types.h> |
23 | #include <asm/irq.h> | |
1da177e4 LT |
24 | |
25 | #include "sclp.h" | |
26 | ||
27 | #define SCLP_HEADER "sclp: " | |
28 | ||
1da177e4 LT |
29 | /* Lock to protect internal data consistency. */ |
30 | static DEFINE_SPINLOCK(sclp_lock); | |
31 | ||
d082d3ce | 32 | /* Mask of events that we can send to the sclp interface. */ |
1da177e4 LT |
33 | static sccb_mask_t sclp_receive_mask; |
34 | ||
d082d3ce | 35 | /* Mask of events that we can receive from the sclp interface. */ |
1da177e4 LT |
36 | static sccb_mask_t sclp_send_mask; |
37 | ||
38 | /* List of registered event listeners and senders. */ | |
39 | static struct list_head sclp_reg_list; | |
40 | ||
41 | /* List of queued requests. */ | |
42 | static struct list_head sclp_req_queue; | |
43 | ||
44 | /* Data for read and and init requests. */ | |
45 | static struct sclp_req sclp_read_req; | |
46 | static struct sclp_req sclp_init_req; | |
47 | static char sclp_read_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
48 | static char sclp_init_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
49 | ||
62b74942 MH |
50 | /* Suspend request */ |
51 | static DECLARE_COMPLETION(sclp_request_queue_flushed); | |
52 | ||
25b41a7b MS |
53 | /* Number of console pages to allocate, used by sclp_con.c and sclp_vt220.c */ |
54 | int sclp_console_pages = SCLP_CONSOLE_PAGES; | |
55 | /* Flag to indicate if buffer pages are dropped on buffer full condition */ | |
56 | int sclp_console_drop = 0; | |
57 | /* Number of times the console dropped buffer pages */ | |
58 | unsigned long sclp_console_full; | |
59 | ||
62b74942 MH |
60 | static void sclp_suspend_req_cb(struct sclp_req *req, void *data) |
61 | { | |
62 | complete(&sclp_request_queue_flushed); | |
63 | } | |
64 | ||
25b41a7b MS |
65 | static int __init sclp_setup_console_pages(char *str) |
66 | { | |
67 | int pages, rc; | |
68 | ||
69 | rc = kstrtoint(str, 0, &pages); | |
70 | if (!rc && pages >= SCLP_CONSOLE_PAGES) | |
71 | sclp_console_pages = pages; | |
72 | return 1; | |
73 | } | |
74 | ||
75 | __setup("sclp_con_pages=", sclp_setup_console_pages); | |
76 | ||
77 | static int __init sclp_setup_console_drop(char *str) | |
78 | { | |
79 | int drop, rc; | |
80 | ||
81 | rc = kstrtoint(str, 0, &drop); | |
82 | if (!rc && drop) | |
83 | sclp_console_drop = 1; | |
84 | return 1; | |
85 | } | |
86 | ||
87 | __setup("sclp_con_drop=", sclp_setup_console_drop); | |
88 | ||
62b74942 MH |
89 | static struct sclp_req sclp_suspend_req; |
90 | ||
1da177e4 LT |
91 | /* Timer for request retries. */ |
92 | static struct timer_list sclp_request_timer; | |
93 | ||
9f0128f9 GS |
94 | /* Timer for queued requests. */ |
95 | static struct timer_list sclp_queue_timer; | |
96 | ||
1da177e4 LT |
97 | /* Internal state: is the driver initialized? */ |
98 | static volatile enum sclp_init_state_t { | |
99 | sclp_init_state_uninitialized, | |
100 | sclp_init_state_initializing, | |
101 | sclp_init_state_initialized | |
102 | } sclp_init_state = sclp_init_state_uninitialized; | |
103 | ||
104 | /* Internal state: is a request active at the sclp? */ | |
105 | static volatile enum sclp_running_state_t { | |
106 | sclp_running_state_idle, | |
dbd8ae63 PO |
107 | sclp_running_state_running, |
108 | sclp_running_state_reset_pending | |
1da177e4 LT |
109 | } sclp_running_state = sclp_running_state_idle; |
110 | ||
111 | /* Internal state: is a read request pending? */ | |
112 | static volatile enum sclp_reading_state_t { | |
113 | sclp_reading_state_idle, | |
114 | sclp_reading_state_reading | |
115 | } sclp_reading_state = sclp_reading_state_idle; | |
116 | ||
117 | /* Internal state: is the driver currently serving requests? */ | |
118 | static volatile enum sclp_activation_state_t { | |
119 | sclp_activation_state_active, | |
120 | sclp_activation_state_deactivating, | |
121 | sclp_activation_state_inactive, | |
122 | sclp_activation_state_activating | |
123 | } sclp_activation_state = sclp_activation_state_active; | |
124 | ||
125 | /* Internal state: is an init mask request pending? */ | |
126 | static volatile enum sclp_mask_state_t { | |
127 | sclp_mask_state_idle, | |
128 | sclp_mask_state_initializing | |
129 | } sclp_mask_state = sclp_mask_state_idle; | |
130 | ||
62b74942 MH |
131 | /* Internal state: is the driver suspended? */ |
132 | static enum sclp_suspend_state_t { | |
133 | sclp_suspend_state_running, | |
134 | sclp_suspend_state_suspended, | |
135 | } sclp_suspend_state = sclp_suspend_state_running; | |
136 | ||
1da177e4 LT |
137 | /* Maximum retry counts */ |
138 | #define SCLP_INIT_RETRY 3 | |
139 | #define SCLP_MASK_RETRY 3 | |
1da177e4 LT |
140 | |
141 | /* Timeout intervals in seconds.*/ | |
25fab9eb | 142 | #define SCLP_BUSY_INTERVAL 10 |
dbd8ae63 | 143 | #define SCLP_RETRY_INTERVAL 30 |
1da177e4 LT |
144 | |
145 | static void sclp_process_queue(void); | |
364c8558 | 146 | static void __sclp_make_read_req(void); |
1da177e4 LT |
147 | static int sclp_init_mask(int calculate); |
148 | static int sclp_init(void); | |
149 | ||
150 | /* Perform service call. Return 0 on success, non-zero otherwise. */ | |
ab14de6c HC |
151 | int |
152 | sclp_service_call(sclp_cmdw_t command, void *sccb) | |
1da177e4 | 153 | { |
d475f942 | 154 | int cc = 4; /* Initialize for program check handling */ |
1da177e4 | 155 | |
94c12cc7 | 156 | asm volatile( |
d475f942 MH |
157 | "0: .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */ |
158 | "1: ipm %0\n" | |
159 | " srl %0,28\n" | |
160 | "2:\n" | |
161 | EX_TABLE(0b, 2b) | |
162 | EX_TABLE(1b, 2b) | |
163 | : "+&d" (cc) : "d" (command), "a" (__pa(sccb)) | |
94c12cc7 | 164 | : "cc", "memory"); |
d475f942 MH |
165 | if (cc == 4) |
166 | return -EINVAL; | |
1da177e4 LT |
167 | if (cc == 3) |
168 | return -EIO; | |
169 | if (cc == 2) | |
170 | return -EBUSY; | |
171 | return 0; | |
172 | } | |
173 | ||
dbd8ae63 | 174 | |
1da177e4 | 175 | static void |
dbd8ae63 | 176 | __sclp_queue_read_req(void) |
1da177e4 | 177 | { |
dbd8ae63 PO |
178 | if (sclp_reading_state == sclp_reading_state_idle) { |
179 | sclp_reading_state = sclp_reading_state_reading; | |
180 | __sclp_make_read_req(); | |
181 | /* Add request to head of queue */ | |
182 | list_add(&sclp_read_req.list, &sclp_req_queue); | |
1da177e4 | 183 | } |
1da177e4 LT |
184 | } |
185 | ||
186 | /* Set up request retry timer. Called while sclp_lock is locked. */ | |
187 | static inline void | |
188 | __sclp_set_request_timer(unsigned long time, void (*function)(unsigned long), | |
189 | unsigned long data) | |
190 | { | |
191 | del_timer(&sclp_request_timer); | |
192 | sclp_request_timer.function = function; | |
193 | sclp_request_timer.data = data; | |
194 | sclp_request_timer.expires = jiffies + time; | |
195 | add_timer(&sclp_request_timer); | |
196 | } | |
197 | ||
dbd8ae63 PO |
198 | /* Request timeout handler. Restart the request queue. If DATA is non-zero, |
199 | * force restart of running request. */ | |
200 | static void | |
201 | sclp_request_timeout(unsigned long data) | |
202 | { | |
203 | unsigned long flags; | |
204 | ||
205 | spin_lock_irqsave(&sclp_lock, flags); | |
206 | if (data) { | |
207 | if (sclp_running_state == sclp_running_state_running) { | |
208 | /* Break running state and queue NOP read event request | |
209 | * to get a defined interface state. */ | |
210 | __sclp_queue_read_req(); | |
211 | sclp_running_state = sclp_running_state_idle; | |
212 | } | |
213 | } else { | |
214 | __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, | |
215 | sclp_request_timeout, 0); | |
216 | } | |
217 | spin_unlock_irqrestore(&sclp_lock, flags); | |
218 | sclp_process_queue(); | |
219 | } | |
220 | ||
9f0128f9 GS |
221 | /* |
222 | * Returns the expire value in jiffies of the next pending request timeout, | |
223 | * if any. Needs to be called with sclp_lock. | |
224 | */ | |
225 | static unsigned long __sclp_req_queue_find_next_timeout(void) | |
226 | { | |
227 | unsigned long expires_next = 0; | |
228 | struct sclp_req *req; | |
229 | ||
230 | list_for_each_entry(req, &sclp_req_queue, list) { | |
231 | if (!req->queue_expires) | |
232 | continue; | |
233 | if (!expires_next || | |
234 | (time_before(req->queue_expires, expires_next))) | |
235 | expires_next = req->queue_expires; | |
236 | } | |
237 | return expires_next; | |
238 | } | |
239 | ||
240 | /* | |
241 | * Returns expired request, if any, and removes it from the list. | |
242 | */ | |
243 | static struct sclp_req *__sclp_req_queue_remove_expired_req(void) | |
244 | { | |
245 | unsigned long flags, now; | |
246 | struct sclp_req *req; | |
247 | ||
248 | spin_lock_irqsave(&sclp_lock, flags); | |
249 | now = jiffies; | |
250 | /* Don't need list_for_each_safe because we break out after list_del */ | |
251 | list_for_each_entry(req, &sclp_req_queue, list) { | |
252 | if (!req->queue_expires) | |
253 | continue; | |
254 | if (time_before_eq(req->queue_expires, now)) { | |
255 | if (req->status == SCLP_REQ_QUEUED) { | |
256 | req->status = SCLP_REQ_QUEUED_TIMEOUT; | |
257 | list_del(&req->list); | |
258 | goto out; | |
259 | } | |
260 | } | |
261 | } | |
262 | req = NULL; | |
263 | out: | |
264 | spin_unlock_irqrestore(&sclp_lock, flags); | |
265 | return req; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Timeout handler for queued requests. Removes request from list and | |
270 | * invokes callback. This timer can be set per request in situations where | |
271 | * waiting too long would be harmful to the system, e.g. during SE reboot. | |
272 | */ | |
273 | static void sclp_req_queue_timeout(unsigned long data) | |
274 | { | |
275 | unsigned long flags, expires_next; | |
276 | struct sclp_req *req; | |
277 | ||
278 | do { | |
279 | req = __sclp_req_queue_remove_expired_req(); | |
280 | if (req && req->callback) | |
281 | req->callback(req, req->callback_data); | |
282 | } while (req); | |
283 | ||
284 | spin_lock_irqsave(&sclp_lock, flags); | |
285 | expires_next = __sclp_req_queue_find_next_timeout(); | |
286 | if (expires_next) | |
287 | mod_timer(&sclp_queue_timer, expires_next); | |
288 | spin_unlock_irqrestore(&sclp_lock, flags); | |
289 | } | |
290 | ||
1da177e4 LT |
291 | /* Try to start a request. Return zero if the request was successfully |
292 | * started or if it will be started at a later time. Return non-zero otherwise. | |
293 | * Called while sclp_lock is locked. */ | |
294 | static int | |
295 | __sclp_start_request(struct sclp_req *req) | |
296 | { | |
297 | int rc; | |
298 | ||
299 | if (sclp_running_state != sclp_running_state_idle) | |
300 | return 0; | |
301 | del_timer(&sclp_request_timer); | |
ab14de6c | 302 | rc = sclp_service_call(req->command, req->sccb); |
25fab9eb PO |
303 | req->start_count++; |
304 | ||
1da177e4 | 305 | if (rc == 0) { |
3ad2f3fb | 306 | /* Successfully started request */ |
1da177e4 LT |
307 | req->status = SCLP_REQ_RUNNING; |
308 | sclp_running_state = sclp_running_state_running; | |
309 | __sclp_set_request_timer(SCLP_RETRY_INTERVAL * HZ, | |
310 | sclp_request_timeout, 1); | |
311 | return 0; | |
312 | } else if (rc == -EBUSY) { | |
313 | /* Try again later */ | |
314 | __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, | |
315 | sclp_request_timeout, 0); | |
316 | return 0; | |
317 | } | |
318 | /* Request failed */ | |
319 | req->status = SCLP_REQ_FAILED; | |
320 | return rc; | |
321 | } | |
322 | ||
323 | /* Try to start queued requests. */ | |
324 | static void | |
325 | sclp_process_queue(void) | |
326 | { | |
327 | struct sclp_req *req; | |
328 | int rc; | |
329 | unsigned long flags; | |
330 | ||
331 | spin_lock_irqsave(&sclp_lock, flags); | |
332 | if (sclp_running_state != sclp_running_state_idle) { | |
333 | spin_unlock_irqrestore(&sclp_lock, flags); | |
334 | return; | |
335 | } | |
336 | del_timer(&sclp_request_timer); | |
337 | while (!list_empty(&sclp_req_queue)) { | |
338 | req = list_entry(sclp_req_queue.next, struct sclp_req, list); | |
62b74942 MH |
339 | if (!req->sccb) |
340 | goto do_post; | |
1da177e4 LT |
341 | rc = __sclp_start_request(req); |
342 | if (rc == 0) | |
343 | break; | |
dbd8ae63 PO |
344 | /* Request failed */ |
345 | if (req->start_count > 1) { | |
346 | /* Cannot abort already submitted request - could still | |
347 | * be active at the SCLP */ | |
348 | __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, | |
349 | sclp_request_timeout, 0); | |
350 | break; | |
351 | } | |
62b74942 | 352 | do_post: |
dbd8ae63 | 353 | /* Post-processing for aborted request */ |
1da177e4 LT |
354 | list_del(&req->list); |
355 | if (req->callback) { | |
356 | spin_unlock_irqrestore(&sclp_lock, flags); | |
357 | req->callback(req, req->callback_data); | |
358 | spin_lock_irqsave(&sclp_lock, flags); | |
359 | } | |
360 | } | |
361 | spin_unlock_irqrestore(&sclp_lock, flags); | |
362 | } | |
363 | ||
62b74942 MH |
364 | static int __sclp_can_add_request(struct sclp_req *req) |
365 | { | |
366 | if (req == &sclp_suspend_req || req == &sclp_init_req) | |
367 | return 1; | |
368 | if (sclp_suspend_state != sclp_suspend_state_running) | |
369 | return 0; | |
370 | if (sclp_init_state != sclp_init_state_initialized) | |
371 | return 0; | |
372 | if (sclp_activation_state != sclp_activation_state_active) | |
373 | return 0; | |
374 | return 1; | |
375 | } | |
376 | ||
1da177e4 LT |
377 | /* Queue a new request. Return zero on success, non-zero otherwise. */ |
378 | int | |
379 | sclp_add_request(struct sclp_req *req) | |
380 | { | |
381 | unsigned long flags; | |
382 | int rc; | |
383 | ||
384 | spin_lock_irqsave(&sclp_lock, flags); | |
62b74942 | 385 | if (!__sclp_can_add_request(req)) { |
1da177e4 LT |
386 | spin_unlock_irqrestore(&sclp_lock, flags); |
387 | return -EIO; | |
388 | } | |
389 | req->status = SCLP_REQ_QUEUED; | |
390 | req->start_count = 0; | |
391 | list_add_tail(&req->list, &sclp_req_queue); | |
392 | rc = 0; | |
9f0128f9 GS |
393 | if (req->queue_timeout) { |
394 | req->queue_expires = jiffies + req->queue_timeout * HZ; | |
395 | if (!timer_pending(&sclp_queue_timer) || | |
396 | time_after(sclp_queue_timer.expires, req->queue_expires)) | |
397 | mod_timer(&sclp_queue_timer, req->queue_expires); | |
398 | } else | |
399 | req->queue_expires = 0; | |
1da177e4 | 400 | /* Start if request is first in list */ |
dbd8ae63 PO |
401 | if (sclp_running_state == sclp_running_state_idle && |
402 | req->list.prev == &sclp_req_queue) { | |
62b74942 MH |
403 | if (!req->sccb) { |
404 | list_del(&req->list); | |
405 | rc = -ENODATA; | |
406 | goto out; | |
407 | } | |
1da177e4 LT |
408 | rc = __sclp_start_request(req); |
409 | if (rc) | |
410 | list_del(&req->list); | |
411 | } | |
62b74942 | 412 | out: |
1da177e4 LT |
413 | spin_unlock_irqrestore(&sclp_lock, flags); |
414 | return rc; | |
415 | } | |
416 | ||
417 | EXPORT_SYMBOL(sclp_add_request); | |
418 | ||
419 | /* Dispatch events found in request buffer to registered listeners. Return 0 | |
420 | * if all events were dispatched, non-zero otherwise. */ | |
421 | static int | |
422 | sclp_dispatch_evbufs(struct sccb_header *sccb) | |
423 | { | |
424 | unsigned long flags; | |
425 | struct evbuf_header *evbuf; | |
426 | struct list_head *l; | |
427 | struct sclp_register *reg; | |
428 | int offset; | |
429 | int rc; | |
430 | ||
431 | spin_lock_irqsave(&sclp_lock, flags); | |
432 | rc = 0; | |
433 | for (offset = sizeof(struct sccb_header); offset < sccb->length; | |
434 | offset += evbuf->length) { | |
1da177e4 | 435 | evbuf = (struct evbuf_header *) ((addr_t) sccb + offset); |
e2e5a0f2 PO |
436 | /* Check for malformed hardware response */ |
437 | if (evbuf->length == 0) | |
438 | break; | |
439 | /* Search for event handler */ | |
1da177e4 LT |
440 | reg = NULL; |
441 | list_for_each(l, &sclp_reg_list) { | |
442 | reg = list_entry(l, struct sclp_register, list); | |
443 | if (reg->receive_mask & (1 << (32 - evbuf->type))) | |
444 | break; | |
445 | else | |
446 | reg = NULL; | |
447 | } | |
448 | if (reg && reg->receiver_fn) { | |
449 | spin_unlock_irqrestore(&sclp_lock, flags); | |
450 | reg->receiver_fn(evbuf); | |
451 | spin_lock_irqsave(&sclp_lock, flags); | |
452 | } else if (reg == NULL) | |
d06cbda6 | 453 | rc = -EOPNOTSUPP; |
1da177e4 LT |
454 | } |
455 | spin_unlock_irqrestore(&sclp_lock, flags); | |
456 | return rc; | |
457 | } | |
458 | ||
459 | /* Read event data request callback. */ | |
460 | static void | |
461 | sclp_read_cb(struct sclp_req *req, void *data) | |
462 | { | |
463 | unsigned long flags; | |
464 | struct sccb_header *sccb; | |
465 | ||
466 | sccb = (struct sccb_header *) req->sccb; | |
467 | if (req->status == SCLP_REQ_DONE && (sccb->response_code == 0x20 || | |
468 | sccb->response_code == 0x220)) | |
469 | sclp_dispatch_evbufs(sccb); | |
470 | spin_lock_irqsave(&sclp_lock, flags); | |
471 | sclp_reading_state = sclp_reading_state_idle; | |
472 | spin_unlock_irqrestore(&sclp_lock, flags); | |
473 | } | |
474 | ||
475 | /* Prepare read event data request. Called while sclp_lock is locked. */ | |
364c8558 | 476 | static void __sclp_make_read_req(void) |
1da177e4 LT |
477 | { |
478 | struct sccb_header *sccb; | |
479 | ||
480 | sccb = (struct sccb_header *) sclp_read_sccb; | |
481 | clear_page(sccb); | |
482 | memset(&sclp_read_req, 0, sizeof(struct sclp_req)); | |
ab14de6c | 483 | sclp_read_req.command = SCLP_CMDW_READ_EVENT_DATA; |
1da177e4 LT |
484 | sclp_read_req.status = SCLP_REQ_QUEUED; |
485 | sclp_read_req.start_count = 0; | |
486 | sclp_read_req.callback = sclp_read_cb; | |
487 | sclp_read_req.sccb = sccb; | |
488 | sccb->length = PAGE_SIZE; | |
489 | sccb->function_code = 0; | |
490 | sccb->control_mask[2] = 0x80; | |
491 | } | |
492 | ||
493 | /* Search request list for request with matching sccb. Return request if found, | |
494 | * NULL otherwise. Called while sclp_lock is locked. */ | |
495 | static inline struct sclp_req * | |
496 | __sclp_find_req(u32 sccb) | |
497 | { | |
498 | struct list_head *l; | |
499 | struct sclp_req *req; | |
500 | ||
501 | list_for_each(l, &sclp_req_queue) { | |
502 | req = list_entry(l, struct sclp_req, list); | |
503 | if (sccb == (u32) (addr_t) req->sccb) | |
504 | return req; | |
505 | } | |
506 | return NULL; | |
507 | } | |
508 | ||
509 | /* Handler for external interruption. Perform request post-processing. | |
510 | * Prepare read event data request if necessary. Start processing of next | |
511 | * request on queue. */ | |
fde15c3a | 512 | static void sclp_interrupt_handler(struct ext_code ext_code, |
f6649a7e | 513 | unsigned int param32, unsigned long param64) |
1da177e4 LT |
514 | { |
515 | struct sclp_req *req; | |
516 | u32 finished_sccb; | |
517 | u32 evbuf_pending; | |
518 | ||
420f42ec | 519 | inc_irq_stat(IRQEXT_SCP); |
1da177e4 | 520 | spin_lock(&sclp_lock); |
f6649a7e MS |
521 | finished_sccb = param32 & 0xfffffff8; |
522 | evbuf_pending = param32 & 0x3; | |
1da177e4 | 523 | if (finished_sccb) { |
dbd8ae63 PO |
524 | del_timer(&sclp_request_timer); |
525 | sclp_running_state = sclp_running_state_reset_pending; | |
1da177e4 LT |
526 | req = __sclp_find_req(finished_sccb); |
527 | if (req) { | |
528 | /* Request post-processing */ | |
529 | list_del(&req->list); | |
530 | req->status = SCLP_REQ_DONE; | |
531 | if (req->callback) { | |
532 | spin_unlock(&sclp_lock); | |
533 | req->callback(req, req->callback_data); | |
534 | spin_lock(&sclp_lock); | |
535 | } | |
536 | } | |
537 | sclp_running_state = sclp_running_state_idle; | |
538 | } | |
d082d3ce | 539 | if (evbuf_pending && |
dbd8ae63 PO |
540 | sclp_activation_state == sclp_activation_state_active) |
541 | __sclp_queue_read_req(); | |
1da177e4 LT |
542 | spin_unlock(&sclp_lock); |
543 | sclp_process_queue(); | |
544 | } | |
545 | ||
1da177e4 LT |
546 | /* Convert interval in jiffies to TOD ticks. */ |
547 | static inline u64 | |
548 | sclp_tod_from_jiffies(unsigned long jiffies) | |
549 | { | |
550 | return (u64) (jiffies / HZ) << 32; | |
551 | } | |
552 | ||
553 | /* Wait until a currently running request finished. Note: while this function | |
554 | * is running, no timers are served on the calling CPU. */ | |
555 | void | |
556 | sclp_sync_wait(void) | |
557 | { | |
934b2857 | 558 | unsigned long long old_tick; |
1f194a4c | 559 | unsigned long flags; |
1da177e4 LT |
560 | unsigned long cr0, cr0_sync; |
561 | u64 timeout; | |
c59d744b | 562 | int irq_context; |
1da177e4 LT |
563 | |
564 | /* We'll be disabling timer interrupts, so we need a custom timeout | |
565 | * mechanism */ | |
566 | timeout = 0; | |
567 | if (timer_pending(&sclp_request_timer)) { | |
568 | /* Get timeout TOD value */ | |
8c071b0f | 569 | timeout = get_tod_clock_fast() + |
1da177e4 LT |
570 | sclp_tod_from_jiffies(sclp_request_timer.expires - |
571 | jiffies); | |
572 | } | |
1f194a4c | 573 | local_irq_save(flags); |
1da177e4 | 574 | /* Prevent bottom half from executing once we force interrupts open */ |
c59d744b HC |
575 | irq_context = in_interrupt(); |
576 | if (!irq_context) | |
577 | local_bh_disable(); | |
1da177e4 | 578 | /* Enable service-signal interruption, disable timer interrupts */ |
934b2857 | 579 | old_tick = local_tick_disable(); |
1f194a4c | 580 | trace_hardirqs_on(); |
1da177e4 LT |
581 | __ctl_store(cr0, 0, 0); |
582 | cr0_sync = cr0; | |
934b2857 | 583 | cr0_sync &= 0xffff00a0; |
1da177e4 | 584 | cr0_sync |= 0x00000200; |
1da177e4 | 585 | __ctl_load(cr0_sync, 0, 0); |
df9ee292 | 586 | __arch_local_irq_stosm(0x01); |
1da177e4 LT |
587 | /* Loop until driver state indicates finished request */ |
588 | while (sclp_running_state != sclp_running_state_idle) { | |
589 | /* Check for expired request timer */ | |
590 | if (timer_pending(&sclp_request_timer) && | |
8c071b0f | 591 | get_tod_clock_fast() > timeout && |
1da177e4 LT |
592 | del_timer(&sclp_request_timer)) |
593 | sclp_request_timer.function(sclp_request_timer.data); | |
1da177e4 LT |
594 | cpu_relax(); |
595 | } | |
1f194a4c | 596 | local_irq_disable(); |
1da177e4 | 597 | __ctl_load(cr0, 0, 0); |
c59d744b HC |
598 | if (!irq_context) |
599 | _local_bh_enable(); | |
934b2857 | 600 | local_tick_enable(old_tick); |
1f194a4c | 601 | local_irq_restore(flags); |
1da177e4 | 602 | } |
1da177e4 LT |
603 | EXPORT_SYMBOL(sclp_sync_wait); |
604 | ||
605 | /* Dispatch changes in send and receive mask to registered listeners. */ | |
4d284cac | 606 | static void |
1da177e4 LT |
607 | sclp_dispatch_state_change(void) |
608 | { | |
609 | struct list_head *l; | |
610 | struct sclp_register *reg; | |
611 | unsigned long flags; | |
612 | sccb_mask_t receive_mask; | |
613 | sccb_mask_t send_mask; | |
614 | ||
615 | do { | |
616 | spin_lock_irqsave(&sclp_lock, flags); | |
617 | reg = NULL; | |
618 | list_for_each(l, &sclp_reg_list) { | |
619 | reg = list_entry(l, struct sclp_register, list); | |
d082d3ce PO |
620 | receive_mask = reg->send_mask & sclp_receive_mask; |
621 | send_mask = reg->receive_mask & sclp_send_mask; | |
1da177e4 LT |
622 | if (reg->sclp_receive_mask != receive_mask || |
623 | reg->sclp_send_mask != send_mask) { | |
624 | reg->sclp_receive_mask = receive_mask; | |
625 | reg->sclp_send_mask = send_mask; | |
626 | break; | |
627 | } else | |
628 | reg = NULL; | |
629 | } | |
630 | spin_unlock_irqrestore(&sclp_lock, flags); | |
631 | if (reg && reg->state_change_fn) | |
632 | reg->state_change_fn(reg); | |
633 | } while (reg); | |
634 | } | |
635 | ||
636 | struct sclp_statechangebuf { | |
637 | struct evbuf_header header; | |
638 | u8 validity_sclp_active_facility_mask : 1; | |
639 | u8 validity_sclp_receive_mask : 1; | |
640 | u8 validity_sclp_send_mask : 1; | |
641 | u8 validity_read_data_function_mask : 1; | |
642 | u16 _zeros : 12; | |
643 | u16 mask_length; | |
644 | u64 sclp_active_facility_mask; | |
645 | sccb_mask_t sclp_receive_mask; | |
646 | sccb_mask_t sclp_send_mask; | |
647 | u32 read_data_function_mask; | |
648 | } __attribute__((packed)); | |
649 | ||
650 | ||
651 | /* State change event callback. Inform listeners of changes. */ | |
652 | static void | |
653 | sclp_state_change_cb(struct evbuf_header *evbuf) | |
654 | { | |
655 | unsigned long flags; | |
656 | struct sclp_statechangebuf *scbuf; | |
657 | ||
658 | scbuf = (struct sclp_statechangebuf *) evbuf; | |
659 | if (scbuf->mask_length != sizeof(sccb_mask_t)) | |
660 | return; | |
661 | spin_lock_irqsave(&sclp_lock, flags); | |
662 | if (scbuf->validity_sclp_receive_mask) | |
663 | sclp_receive_mask = scbuf->sclp_receive_mask; | |
664 | if (scbuf->validity_sclp_send_mask) | |
665 | sclp_send_mask = scbuf->sclp_send_mask; | |
666 | spin_unlock_irqrestore(&sclp_lock, flags); | |
887d935a HC |
667 | if (scbuf->validity_sclp_active_facility_mask) |
668 | sclp_facilities = scbuf->sclp_active_facility_mask; | |
1da177e4 LT |
669 | sclp_dispatch_state_change(); |
670 | } | |
671 | ||
672 | static struct sclp_register sclp_state_change_event = { | |
6d4740c8 | 673 | .receive_mask = EVTYP_STATECHANGE_MASK, |
1da177e4 LT |
674 | .receiver_fn = sclp_state_change_cb |
675 | }; | |
676 | ||
677 | /* Calculate receive and send mask of currently registered listeners. | |
678 | * Called while sclp_lock is locked. */ | |
679 | static inline void | |
680 | __sclp_get_mask(sccb_mask_t *receive_mask, sccb_mask_t *send_mask) | |
681 | { | |
682 | struct list_head *l; | |
683 | struct sclp_register *t; | |
684 | ||
685 | *receive_mask = 0; | |
686 | *send_mask = 0; | |
687 | list_for_each(l, &sclp_reg_list) { | |
688 | t = list_entry(l, struct sclp_register, list); | |
689 | *receive_mask |= t->receive_mask; | |
690 | *send_mask |= t->send_mask; | |
691 | } | |
692 | } | |
693 | ||
694 | /* Register event listener. Return 0 on success, non-zero otherwise. */ | |
695 | int | |
696 | sclp_register(struct sclp_register *reg) | |
697 | { | |
698 | unsigned long flags; | |
699 | sccb_mask_t receive_mask; | |
700 | sccb_mask_t send_mask; | |
701 | int rc; | |
702 | ||
703 | rc = sclp_init(); | |
704 | if (rc) | |
705 | return rc; | |
706 | spin_lock_irqsave(&sclp_lock, flags); | |
707 | /* Check event mask for collisions */ | |
708 | __sclp_get_mask(&receive_mask, &send_mask); | |
709 | if (reg->receive_mask & receive_mask || reg->send_mask & send_mask) { | |
710 | spin_unlock_irqrestore(&sclp_lock, flags); | |
711 | return -EBUSY; | |
712 | } | |
713 | /* Trigger initial state change callback */ | |
714 | reg->sclp_receive_mask = 0; | |
715 | reg->sclp_send_mask = 0; | |
62b74942 | 716 | reg->pm_event_posted = 0; |
1da177e4 LT |
717 | list_add(®->list, &sclp_reg_list); |
718 | spin_unlock_irqrestore(&sclp_lock, flags); | |
719 | rc = sclp_init_mask(1); | |
720 | if (rc) { | |
721 | spin_lock_irqsave(&sclp_lock, flags); | |
722 | list_del(®->list); | |
723 | spin_unlock_irqrestore(&sclp_lock, flags); | |
724 | } | |
725 | return rc; | |
726 | } | |
727 | ||
728 | EXPORT_SYMBOL(sclp_register); | |
729 | ||
730 | /* Unregister event listener. */ | |
731 | void | |
732 | sclp_unregister(struct sclp_register *reg) | |
733 | { | |
734 | unsigned long flags; | |
735 | ||
736 | spin_lock_irqsave(&sclp_lock, flags); | |
737 | list_del(®->list); | |
738 | spin_unlock_irqrestore(&sclp_lock, flags); | |
739 | sclp_init_mask(1); | |
740 | } | |
741 | ||
742 | EXPORT_SYMBOL(sclp_unregister); | |
743 | ||
744 | /* Remove event buffers which are marked processed. Return the number of | |
745 | * remaining event buffers. */ | |
746 | int | |
747 | sclp_remove_processed(struct sccb_header *sccb) | |
748 | { | |
749 | struct evbuf_header *evbuf; | |
750 | int unprocessed; | |
751 | u16 remaining; | |
752 | ||
753 | evbuf = (struct evbuf_header *) (sccb + 1); | |
754 | unprocessed = 0; | |
755 | remaining = sccb->length - sizeof(struct sccb_header); | |
756 | while (remaining > 0) { | |
757 | remaining -= evbuf->length; | |
758 | if (evbuf->flags & 0x80) { | |
759 | sccb->length -= evbuf->length; | |
760 | memcpy(evbuf, (void *) ((addr_t) evbuf + evbuf->length), | |
761 | remaining); | |
762 | } else { | |
763 | unprocessed++; | |
764 | evbuf = (struct evbuf_header *) | |
765 | ((addr_t) evbuf + evbuf->length); | |
766 | } | |
767 | } | |
768 | return unprocessed; | |
769 | } | |
770 | ||
771 | EXPORT_SYMBOL(sclp_remove_processed); | |
772 | ||
1da177e4 LT |
773 | /* Prepare init mask request. Called while sclp_lock is locked. */ |
774 | static inline void | |
775 | __sclp_make_init_req(u32 receive_mask, u32 send_mask) | |
776 | { | |
777 | struct init_sccb *sccb; | |
778 | ||
779 | sccb = (struct init_sccb *) sclp_init_sccb; | |
780 | clear_page(sccb); | |
781 | memset(&sclp_init_req, 0, sizeof(struct sclp_req)); | |
ab14de6c | 782 | sclp_init_req.command = SCLP_CMDW_WRITE_EVENT_MASK; |
1da177e4 LT |
783 | sclp_init_req.status = SCLP_REQ_FILLED; |
784 | sclp_init_req.start_count = 0; | |
785 | sclp_init_req.callback = NULL; | |
786 | sclp_init_req.callback_data = NULL; | |
787 | sclp_init_req.sccb = sccb; | |
788 | sccb->header.length = sizeof(struct init_sccb); | |
789 | sccb->mask_length = sizeof(sccb_mask_t); | |
790 | sccb->receive_mask = receive_mask; | |
791 | sccb->send_mask = send_mask; | |
792 | sccb->sclp_receive_mask = 0; | |
793 | sccb->sclp_send_mask = 0; | |
794 | } | |
795 | ||
796 | /* Start init mask request. If calculate is non-zero, calculate the mask as | |
797 | * requested by registered listeners. Use zero mask otherwise. Return 0 on | |
798 | * success, non-zero otherwise. */ | |
799 | static int | |
800 | sclp_init_mask(int calculate) | |
801 | { | |
802 | unsigned long flags; | |
803 | struct init_sccb *sccb = (struct init_sccb *) sclp_init_sccb; | |
804 | sccb_mask_t receive_mask; | |
805 | sccb_mask_t send_mask; | |
806 | int retry; | |
807 | int rc; | |
808 | unsigned long wait; | |
809 | ||
810 | spin_lock_irqsave(&sclp_lock, flags); | |
811 | /* Check if interface is in appropriate state */ | |
812 | if (sclp_mask_state != sclp_mask_state_idle) { | |
813 | spin_unlock_irqrestore(&sclp_lock, flags); | |
814 | return -EBUSY; | |
815 | } | |
816 | if (sclp_activation_state == sclp_activation_state_inactive) { | |
817 | spin_unlock_irqrestore(&sclp_lock, flags); | |
818 | return -EINVAL; | |
819 | } | |
820 | sclp_mask_state = sclp_mask_state_initializing; | |
821 | /* Determine mask */ | |
822 | if (calculate) | |
823 | __sclp_get_mask(&receive_mask, &send_mask); | |
824 | else { | |
825 | receive_mask = 0; | |
826 | send_mask = 0; | |
827 | } | |
828 | rc = -EIO; | |
829 | for (retry = 0; retry <= SCLP_MASK_RETRY; retry++) { | |
830 | /* Prepare request */ | |
831 | __sclp_make_init_req(receive_mask, send_mask); | |
832 | spin_unlock_irqrestore(&sclp_lock, flags); | |
833 | if (sclp_add_request(&sclp_init_req)) { | |
834 | /* Try again later */ | |
835 | wait = jiffies + SCLP_BUSY_INTERVAL * HZ; | |
836 | while (time_before(jiffies, wait)) | |
837 | sclp_sync_wait(); | |
838 | spin_lock_irqsave(&sclp_lock, flags); | |
839 | continue; | |
840 | } | |
841 | while (sclp_init_req.status != SCLP_REQ_DONE && | |
842 | sclp_init_req.status != SCLP_REQ_FAILED) | |
843 | sclp_sync_wait(); | |
844 | spin_lock_irqsave(&sclp_lock, flags); | |
845 | if (sclp_init_req.status == SCLP_REQ_DONE && | |
846 | sccb->header.response_code == 0x20) { | |
847 | /* Successful request */ | |
848 | if (calculate) { | |
849 | sclp_receive_mask = sccb->sclp_receive_mask; | |
850 | sclp_send_mask = sccb->sclp_send_mask; | |
851 | } else { | |
852 | sclp_receive_mask = 0; | |
853 | sclp_send_mask = 0; | |
854 | } | |
855 | spin_unlock_irqrestore(&sclp_lock, flags); | |
856 | sclp_dispatch_state_change(); | |
857 | spin_lock_irqsave(&sclp_lock, flags); | |
858 | rc = 0; | |
859 | break; | |
860 | } | |
861 | } | |
862 | sclp_mask_state = sclp_mask_state_idle; | |
863 | spin_unlock_irqrestore(&sclp_lock, flags); | |
864 | return rc; | |
865 | } | |
866 | ||
867 | /* Deactivate SCLP interface. On success, new requests will be rejected, | |
868 | * events will no longer be dispatched. Return 0 on success, non-zero | |
869 | * otherwise. */ | |
870 | int | |
871 | sclp_deactivate(void) | |
872 | { | |
873 | unsigned long flags; | |
874 | int rc; | |
875 | ||
876 | spin_lock_irqsave(&sclp_lock, flags); | |
877 | /* Deactivate can only be called when active */ | |
878 | if (sclp_activation_state != sclp_activation_state_active) { | |
879 | spin_unlock_irqrestore(&sclp_lock, flags); | |
880 | return -EINVAL; | |
881 | } | |
882 | sclp_activation_state = sclp_activation_state_deactivating; | |
883 | spin_unlock_irqrestore(&sclp_lock, flags); | |
884 | rc = sclp_init_mask(0); | |
885 | spin_lock_irqsave(&sclp_lock, flags); | |
886 | if (rc == 0) | |
887 | sclp_activation_state = sclp_activation_state_inactive; | |
888 | else | |
889 | sclp_activation_state = sclp_activation_state_active; | |
890 | spin_unlock_irqrestore(&sclp_lock, flags); | |
891 | return rc; | |
892 | } | |
893 | ||
894 | EXPORT_SYMBOL(sclp_deactivate); | |
895 | ||
896 | /* Reactivate SCLP interface after sclp_deactivate. On success, new | |
897 | * requests will be accepted, events will be dispatched again. Return 0 on | |
898 | * success, non-zero otherwise. */ | |
899 | int | |
900 | sclp_reactivate(void) | |
901 | { | |
902 | unsigned long flags; | |
903 | int rc; | |
904 | ||
905 | spin_lock_irqsave(&sclp_lock, flags); | |
906 | /* Reactivate can only be called when inactive */ | |
907 | if (sclp_activation_state != sclp_activation_state_inactive) { | |
908 | spin_unlock_irqrestore(&sclp_lock, flags); | |
909 | return -EINVAL; | |
910 | } | |
911 | sclp_activation_state = sclp_activation_state_activating; | |
912 | spin_unlock_irqrestore(&sclp_lock, flags); | |
913 | rc = sclp_init_mask(1); | |
914 | spin_lock_irqsave(&sclp_lock, flags); | |
915 | if (rc == 0) | |
916 | sclp_activation_state = sclp_activation_state_active; | |
917 | else | |
918 | sclp_activation_state = sclp_activation_state_inactive; | |
919 | spin_unlock_irqrestore(&sclp_lock, flags); | |
920 | return rc; | |
921 | } | |
922 | ||
923 | EXPORT_SYMBOL(sclp_reactivate); | |
924 | ||
925 | /* Handler for external interruption used during initialization. Modify | |
926 | * request state to done. */ | |
fde15c3a | 927 | static void sclp_check_handler(struct ext_code ext_code, |
f6649a7e | 928 | unsigned int param32, unsigned long param64) |
1da177e4 LT |
929 | { |
930 | u32 finished_sccb; | |
931 | ||
420f42ec | 932 | inc_irq_stat(IRQEXT_SCP); |
f6649a7e | 933 | finished_sccb = param32 & 0xfffffff8; |
1da177e4 LT |
934 | /* Is this the interrupt we are waiting for? */ |
935 | if (finished_sccb == 0) | |
936 | return; | |
a12c53f4 MS |
937 | if (finished_sccb != (u32) (addr_t) sclp_init_sccb) |
938 | panic("sclp: unsolicited interrupt for buffer at 0x%x\n", | |
939 | finished_sccb); | |
1da177e4 LT |
940 | spin_lock(&sclp_lock); |
941 | if (sclp_running_state == sclp_running_state_running) { | |
942 | sclp_init_req.status = SCLP_REQ_DONE; | |
943 | sclp_running_state = sclp_running_state_idle; | |
944 | } | |
945 | spin_unlock(&sclp_lock); | |
946 | } | |
947 | ||
948 | /* Initial init mask request timed out. Modify request state to failed. */ | |
949 | static void | |
950 | sclp_check_timeout(unsigned long data) | |
951 | { | |
952 | unsigned long flags; | |
953 | ||
954 | spin_lock_irqsave(&sclp_lock, flags); | |
955 | if (sclp_running_state == sclp_running_state_running) { | |
956 | sclp_init_req.status = SCLP_REQ_FAILED; | |
957 | sclp_running_state = sclp_running_state_idle; | |
958 | } | |
959 | spin_unlock_irqrestore(&sclp_lock, flags); | |
960 | } | |
961 | ||
962 | /* Perform a check of the SCLP interface. Return zero if the interface is | |
963 | * available and there are no pending requests from a previous instance. | |
964 | * Return non-zero otherwise. */ | |
965 | static int | |
966 | sclp_check_interface(void) | |
967 | { | |
968 | struct init_sccb *sccb; | |
969 | unsigned long flags; | |
970 | int retry; | |
971 | int rc; | |
972 | ||
973 | spin_lock_irqsave(&sclp_lock, flags); | |
974 | /* Prepare init mask command */ | |
1dad093b | 975 | rc = register_external_irq(EXT_IRQ_SERVICE_SIG, sclp_check_handler); |
1da177e4 LT |
976 | if (rc) { |
977 | spin_unlock_irqrestore(&sclp_lock, flags); | |
978 | return rc; | |
979 | } | |
980 | for (retry = 0; retry <= SCLP_INIT_RETRY; retry++) { | |
981 | __sclp_make_init_req(0, 0); | |
982 | sccb = (struct init_sccb *) sclp_init_req.sccb; | |
ab14de6c | 983 | rc = sclp_service_call(sclp_init_req.command, sccb); |
1da177e4 LT |
984 | if (rc == -EIO) |
985 | break; | |
986 | sclp_init_req.status = SCLP_REQ_RUNNING; | |
987 | sclp_running_state = sclp_running_state_running; | |
988 | __sclp_set_request_timer(SCLP_RETRY_INTERVAL * HZ, | |
989 | sclp_check_timeout, 0); | |
990 | spin_unlock_irqrestore(&sclp_lock, flags); | |
991 | /* Enable service-signal interruption - needs to happen | |
992 | * with IRQs enabled. */ | |
82003c3e | 993 | irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); |
1da177e4 LT |
994 | /* Wait for signal from interrupt or timeout */ |
995 | sclp_sync_wait(); | |
996 | /* Disable service-signal interruption - needs to happen | |
997 | * with IRQs enabled. */ | |
82003c3e | 998 | irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL); |
1da177e4 LT |
999 | spin_lock_irqsave(&sclp_lock, flags); |
1000 | del_timer(&sclp_request_timer); | |
1001 | if (sclp_init_req.status == SCLP_REQ_DONE && | |
1002 | sccb->header.response_code == 0x20) { | |
1003 | rc = 0; | |
1004 | break; | |
1005 | } else | |
1006 | rc = -EBUSY; | |
1007 | } | |
1dad093b | 1008 | unregister_external_irq(EXT_IRQ_SERVICE_SIG, sclp_check_handler); |
1da177e4 LT |
1009 | spin_unlock_irqrestore(&sclp_lock, flags); |
1010 | return rc; | |
1011 | } | |
1012 | ||
1013 | /* Reboot event handler. Reset send and receive mask to prevent pending SCLP | |
1014 | * events from interfering with rebooted system. */ | |
1015 | static int | |
1016 | sclp_reboot_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1017 | { | |
1018 | sclp_deactivate(); | |
1019 | return NOTIFY_DONE; | |
1020 | } | |
1021 | ||
1022 | static struct notifier_block sclp_reboot_notifier = { | |
1023 | .notifier_call = sclp_reboot_event | |
1024 | }; | |
1025 | ||
62b74942 MH |
1026 | /* |
1027 | * Suspend/resume SCLP notifier implementation | |
1028 | */ | |
1029 | ||
1030 | static void sclp_pm_event(enum sclp_pm_event sclp_pm_event, int rollback) | |
1031 | { | |
1032 | struct sclp_register *reg; | |
1033 | unsigned long flags; | |
1034 | ||
1035 | if (!rollback) { | |
1036 | spin_lock_irqsave(&sclp_lock, flags); | |
1037 | list_for_each_entry(reg, &sclp_reg_list, list) | |
1038 | reg->pm_event_posted = 0; | |
1039 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1040 | } | |
1041 | do { | |
1042 | spin_lock_irqsave(&sclp_lock, flags); | |
1043 | list_for_each_entry(reg, &sclp_reg_list, list) { | |
1044 | if (rollback && reg->pm_event_posted) | |
1045 | goto found; | |
1046 | if (!rollback && !reg->pm_event_posted) | |
1047 | goto found; | |
1048 | } | |
1049 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1050 | return; | |
1051 | found: | |
1052 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1053 | if (reg->pm_event_fn) | |
1054 | reg->pm_event_fn(reg, sclp_pm_event); | |
1055 | reg->pm_event_posted = rollback ? 0 : 1; | |
1056 | } while (1); | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * Susend/resume callbacks for platform device | |
1061 | */ | |
1062 | ||
1063 | static int sclp_freeze(struct device *dev) | |
1064 | { | |
1065 | unsigned long flags; | |
1066 | int rc; | |
1067 | ||
1068 | sclp_pm_event(SCLP_PM_EVENT_FREEZE, 0); | |
1069 | ||
1070 | spin_lock_irqsave(&sclp_lock, flags); | |
1071 | sclp_suspend_state = sclp_suspend_state_suspended; | |
1072 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1073 | ||
1074 | /* Init supend data */ | |
1075 | memset(&sclp_suspend_req, 0, sizeof(sclp_suspend_req)); | |
1076 | sclp_suspend_req.callback = sclp_suspend_req_cb; | |
1077 | sclp_suspend_req.status = SCLP_REQ_FILLED; | |
1078 | init_completion(&sclp_request_queue_flushed); | |
1079 | ||
1080 | rc = sclp_add_request(&sclp_suspend_req); | |
1081 | if (rc == 0) | |
1082 | wait_for_completion(&sclp_request_queue_flushed); | |
1083 | else if (rc != -ENODATA) | |
1084 | goto fail_thaw; | |
1085 | ||
1086 | rc = sclp_deactivate(); | |
1087 | if (rc) | |
1088 | goto fail_thaw; | |
1089 | return 0; | |
1090 | ||
1091 | fail_thaw: | |
1092 | spin_lock_irqsave(&sclp_lock, flags); | |
1093 | sclp_suspend_state = sclp_suspend_state_running; | |
1094 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1095 | sclp_pm_event(SCLP_PM_EVENT_THAW, 1); | |
1096 | return rc; | |
1097 | } | |
1098 | ||
1099 | static int sclp_undo_suspend(enum sclp_pm_event event) | |
1100 | { | |
1101 | unsigned long flags; | |
1102 | int rc; | |
1103 | ||
1104 | rc = sclp_reactivate(); | |
1105 | if (rc) | |
1106 | return rc; | |
1107 | ||
1108 | spin_lock_irqsave(&sclp_lock, flags); | |
1109 | sclp_suspend_state = sclp_suspend_state_running; | |
1110 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1111 | ||
1112 | sclp_pm_event(event, 0); | |
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | static int sclp_thaw(struct device *dev) | |
1117 | { | |
1118 | return sclp_undo_suspend(SCLP_PM_EVENT_THAW); | |
1119 | } | |
1120 | ||
1121 | static int sclp_restore(struct device *dev) | |
1122 | { | |
1123 | return sclp_undo_suspend(SCLP_PM_EVENT_RESTORE); | |
1124 | } | |
1125 | ||
47145210 | 1126 | static const struct dev_pm_ops sclp_pm_ops = { |
62b74942 MH |
1127 | .freeze = sclp_freeze, |
1128 | .thaw = sclp_thaw, | |
1129 | .restore = sclp_restore, | |
1130 | }; | |
1131 | ||
25b41a7b MS |
1132 | static ssize_t sclp_show_console_pages(struct device_driver *dev, char *buf) |
1133 | { | |
1134 | return sprintf(buf, "%i\n", sclp_console_pages); | |
1135 | } | |
1136 | ||
1137 | static DRIVER_ATTR(con_pages, S_IRUSR, sclp_show_console_pages, NULL); | |
1138 | ||
1139 | static ssize_t sclp_show_con_drop(struct device_driver *dev, char *buf) | |
1140 | { | |
1141 | return sprintf(buf, "%i\n", sclp_console_drop); | |
1142 | } | |
1143 | ||
1144 | static DRIVER_ATTR(con_drop, S_IRUSR, sclp_show_con_drop, NULL); | |
1145 | ||
1146 | static ssize_t sclp_show_console_full(struct device_driver *dev, char *buf) | |
1147 | { | |
1148 | return sprintf(buf, "%lu\n", sclp_console_full); | |
1149 | } | |
1150 | ||
1151 | static DRIVER_ATTR(con_full, S_IRUSR, sclp_show_console_full, NULL); | |
1152 | ||
1153 | static struct attribute *sclp_drv_attrs[] = { | |
1154 | &driver_attr_con_pages.attr, | |
1155 | &driver_attr_con_drop.attr, | |
1156 | &driver_attr_con_full.attr, | |
1157 | NULL, | |
1158 | }; | |
1159 | static struct attribute_group sclp_drv_attr_group = { | |
1160 | .attrs = sclp_drv_attrs, | |
1161 | }; | |
1162 | static const struct attribute_group *sclp_drv_attr_groups[] = { | |
1163 | &sclp_drv_attr_group, | |
1164 | NULL, | |
1165 | }; | |
1166 | ||
62b74942 MH |
1167 | static struct platform_driver sclp_pdrv = { |
1168 | .driver = { | |
1169 | .name = "sclp", | |
1170 | .owner = THIS_MODULE, | |
1171 | .pm = &sclp_pm_ops, | |
25b41a7b | 1172 | .groups = sclp_drv_attr_groups, |
62b74942 MH |
1173 | }, |
1174 | }; | |
1175 | ||
1176 | static struct platform_device *sclp_pdev; | |
1177 | ||
1da177e4 LT |
1178 | /* Initialize SCLP driver. Return zero if driver is operational, non-zero |
1179 | * otherwise. */ | |
1180 | static int | |
1181 | sclp_init(void) | |
1182 | { | |
1183 | unsigned long flags; | |
62b74942 | 1184 | int rc = 0; |
1da177e4 | 1185 | |
1da177e4 LT |
1186 | spin_lock_irqsave(&sclp_lock, flags); |
1187 | /* Check for previous or running initialization */ | |
62b74942 MH |
1188 | if (sclp_init_state != sclp_init_state_uninitialized) |
1189 | goto fail_unlock; | |
1da177e4 LT |
1190 | sclp_init_state = sclp_init_state_initializing; |
1191 | /* Set up variables */ | |
1192 | INIT_LIST_HEAD(&sclp_req_queue); | |
1193 | INIT_LIST_HEAD(&sclp_reg_list); | |
1194 | list_add(&sclp_state_change_event.list, &sclp_reg_list); | |
1195 | init_timer(&sclp_request_timer); | |
9f0128f9 GS |
1196 | init_timer(&sclp_queue_timer); |
1197 | sclp_queue_timer.function = sclp_req_queue_timeout; | |
1da177e4 LT |
1198 | /* Check interface */ |
1199 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1200 | rc = sclp_check_interface(); | |
1201 | spin_lock_irqsave(&sclp_lock, flags); | |
62b74942 MH |
1202 | if (rc) |
1203 | goto fail_init_state_uninitialized; | |
1da177e4 LT |
1204 | /* Register reboot handler */ |
1205 | rc = register_reboot_notifier(&sclp_reboot_notifier); | |
62b74942 MH |
1206 | if (rc) |
1207 | goto fail_init_state_uninitialized; | |
1da177e4 | 1208 | /* Register interrupt handler */ |
1dad093b | 1209 | rc = register_external_irq(EXT_IRQ_SERVICE_SIG, sclp_interrupt_handler); |
62b74942 MH |
1210 | if (rc) |
1211 | goto fail_unregister_reboot_notifier; | |
1da177e4 LT |
1212 | sclp_init_state = sclp_init_state_initialized; |
1213 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1214 | /* Enable service-signal external interruption - needs to happen with | |
1215 | * IRQs enabled. */ | |
82003c3e | 1216 | irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); |
1da177e4 LT |
1217 | sclp_init_mask(1); |
1218 | return 0; | |
62b74942 MH |
1219 | |
1220 | fail_unregister_reboot_notifier: | |
1221 | unregister_reboot_notifier(&sclp_reboot_notifier); | |
1222 | fail_init_state_uninitialized: | |
1223 | sclp_init_state = sclp_init_state_uninitialized; | |
1224 | fail_unlock: | |
1225 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1226 | return rc; | |
1da177e4 | 1227 | } |
b3d00c3b | 1228 | |
62b74942 MH |
1229 | /* |
1230 | * SCLP panic notifier: If we are suspended, we thaw SCLP in order to be able | |
1231 | * to print the panic message. | |
1232 | */ | |
1233 | static int sclp_panic_notify(struct notifier_block *self, | |
1234 | unsigned long event, void *data) | |
1235 | { | |
1236 | if (sclp_suspend_state == sclp_suspend_state_suspended) | |
1237 | sclp_undo_suspend(SCLP_PM_EVENT_THAW); | |
1238 | return NOTIFY_OK; | |
1239 | } | |
1240 | ||
1241 | static struct notifier_block sclp_on_panic_nb = { | |
1242 | .notifier_call = sclp_panic_notify, | |
1243 | .priority = SCLP_PANIC_PRIO, | |
1244 | }; | |
1245 | ||
b3d00c3b PO |
1246 | static __init int sclp_initcall(void) |
1247 | { | |
62b74942 MH |
1248 | int rc; |
1249 | ||
1250 | rc = platform_driver_register(&sclp_pdrv); | |
1251 | if (rc) | |
1252 | return rc; | |
25b41a7b | 1253 | |
62b74942 | 1254 | sclp_pdev = platform_device_register_simple("sclp", -1, NULL, 0); |
83d8e252 | 1255 | rc = PTR_ERR_OR_ZERO(sclp_pdev); |
62b74942 MH |
1256 | if (rc) |
1257 | goto fail_platform_driver_unregister; | |
25b41a7b | 1258 | |
62b74942 MH |
1259 | rc = atomic_notifier_chain_register(&panic_notifier_list, |
1260 | &sclp_on_panic_nb); | |
1261 | if (rc) | |
1262 | goto fail_platform_device_unregister; | |
1263 | ||
b3d00c3b | 1264 | return sclp_init(); |
62b74942 MH |
1265 | |
1266 | fail_platform_device_unregister: | |
1267 | platform_device_unregister(sclp_pdev); | |
1268 | fail_platform_driver_unregister: | |
1269 | platform_driver_unregister(&sclp_pdrv); | |
1270 | return rc; | |
b3d00c3b PO |
1271 | } |
1272 | ||
1273 | arch_initcall(sclp_initcall); |