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Commit | Line | Data |
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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> | |
1da177e4 | 22 | #include <asm/s390_ext.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 | ||
30 | /* Structure for register_early_external_interrupt. */ | |
31 | static ext_int_info_t ext_int_info_hwc; | |
32 | ||
33 | /* Lock to protect internal data consistency. */ | |
34 | static DEFINE_SPINLOCK(sclp_lock); | |
35 | ||
d082d3ce | 36 | /* Mask of events that we can send to the sclp interface. */ |
1da177e4 LT |
37 | static sccb_mask_t sclp_receive_mask; |
38 | ||
d082d3ce | 39 | /* Mask of events that we can receive from the sclp interface. */ |
1da177e4 LT |
40 | static sccb_mask_t sclp_send_mask; |
41 | ||
42 | /* List of registered event listeners and senders. */ | |
43 | static struct list_head sclp_reg_list; | |
44 | ||
45 | /* List of queued requests. */ | |
46 | static struct list_head sclp_req_queue; | |
47 | ||
48 | /* Data for read and and init requests. */ | |
49 | static struct sclp_req sclp_read_req; | |
50 | static struct sclp_req sclp_init_req; | |
51 | static char sclp_read_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
52 | static char sclp_init_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
53 | ||
62b74942 MH |
54 | /* Suspend request */ |
55 | static DECLARE_COMPLETION(sclp_request_queue_flushed); | |
56 | ||
57 | static void sclp_suspend_req_cb(struct sclp_req *req, void *data) | |
58 | { | |
59 | complete(&sclp_request_queue_flushed); | |
60 | } | |
61 | ||
62 | static struct sclp_req sclp_suspend_req; | |
63 | ||
1da177e4 LT |
64 | /* Timer for request retries. */ |
65 | static struct timer_list sclp_request_timer; | |
66 | ||
67 | /* Internal state: is the driver initialized? */ | |
68 | static volatile enum sclp_init_state_t { | |
69 | sclp_init_state_uninitialized, | |
70 | sclp_init_state_initializing, | |
71 | sclp_init_state_initialized | |
72 | } sclp_init_state = sclp_init_state_uninitialized; | |
73 | ||
74 | /* Internal state: is a request active at the sclp? */ | |
75 | static volatile enum sclp_running_state_t { | |
76 | sclp_running_state_idle, | |
dbd8ae63 PO |
77 | sclp_running_state_running, |
78 | sclp_running_state_reset_pending | |
1da177e4 LT |
79 | } sclp_running_state = sclp_running_state_idle; |
80 | ||
81 | /* Internal state: is a read request pending? */ | |
82 | static volatile enum sclp_reading_state_t { | |
83 | sclp_reading_state_idle, | |
84 | sclp_reading_state_reading | |
85 | } sclp_reading_state = sclp_reading_state_idle; | |
86 | ||
87 | /* Internal state: is the driver currently serving requests? */ | |
88 | static volatile enum sclp_activation_state_t { | |
89 | sclp_activation_state_active, | |
90 | sclp_activation_state_deactivating, | |
91 | sclp_activation_state_inactive, | |
92 | sclp_activation_state_activating | |
93 | } sclp_activation_state = sclp_activation_state_active; | |
94 | ||
95 | /* Internal state: is an init mask request pending? */ | |
96 | static volatile enum sclp_mask_state_t { | |
97 | sclp_mask_state_idle, | |
98 | sclp_mask_state_initializing | |
99 | } sclp_mask_state = sclp_mask_state_idle; | |
100 | ||
62b74942 MH |
101 | /* Internal state: is the driver suspended? */ |
102 | static enum sclp_suspend_state_t { | |
103 | sclp_suspend_state_running, | |
104 | sclp_suspend_state_suspended, | |
105 | } sclp_suspend_state = sclp_suspend_state_running; | |
106 | ||
1da177e4 LT |
107 | /* Maximum retry counts */ |
108 | #define SCLP_INIT_RETRY 3 | |
109 | #define SCLP_MASK_RETRY 3 | |
1da177e4 LT |
110 | |
111 | /* Timeout intervals in seconds.*/ | |
25fab9eb | 112 | #define SCLP_BUSY_INTERVAL 10 |
dbd8ae63 | 113 | #define SCLP_RETRY_INTERVAL 30 |
1da177e4 LT |
114 | |
115 | static void sclp_process_queue(void); | |
364c8558 | 116 | static void __sclp_make_read_req(void); |
1da177e4 LT |
117 | static int sclp_init_mask(int calculate); |
118 | static int sclp_init(void); | |
119 | ||
120 | /* Perform service call. Return 0 on success, non-zero otherwise. */ | |
ab14de6c HC |
121 | int |
122 | sclp_service_call(sclp_cmdw_t command, void *sccb) | |
1da177e4 LT |
123 | { |
124 | int cc; | |
125 | ||
94c12cc7 MS |
126 | asm volatile( |
127 | " .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */ | |
128 | " ipm %0\n" | |
129 | " srl %0,28" | |
130 | : "=&d" (cc) : "d" (command), "a" (__pa(sccb)) | |
131 | : "cc", "memory"); | |
1da177e4 LT |
132 | if (cc == 3) |
133 | return -EIO; | |
134 | if (cc == 2) | |
135 | return -EBUSY; | |
136 | return 0; | |
137 | } | |
138 | ||
dbd8ae63 | 139 | |
1da177e4 | 140 | static void |
dbd8ae63 | 141 | __sclp_queue_read_req(void) |
1da177e4 | 142 | { |
dbd8ae63 PO |
143 | if (sclp_reading_state == sclp_reading_state_idle) { |
144 | sclp_reading_state = sclp_reading_state_reading; | |
145 | __sclp_make_read_req(); | |
146 | /* Add request to head of queue */ | |
147 | list_add(&sclp_read_req.list, &sclp_req_queue); | |
1da177e4 | 148 | } |
1da177e4 LT |
149 | } |
150 | ||
151 | /* Set up request retry timer. Called while sclp_lock is locked. */ | |
152 | static inline void | |
153 | __sclp_set_request_timer(unsigned long time, void (*function)(unsigned long), | |
154 | unsigned long data) | |
155 | { | |
156 | del_timer(&sclp_request_timer); | |
157 | sclp_request_timer.function = function; | |
158 | sclp_request_timer.data = data; | |
159 | sclp_request_timer.expires = jiffies + time; | |
160 | add_timer(&sclp_request_timer); | |
161 | } | |
162 | ||
dbd8ae63 PO |
163 | /* Request timeout handler. Restart the request queue. If DATA is non-zero, |
164 | * force restart of running request. */ | |
165 | static void | |
166 | sclp_request_timeout(unsigned long data) | |
167 | { | |
168 | unsigned long flags; | |
169 | ||
170 | spin_lock_irqsave(&sclp_lock, flags); | |
171 | if (data) { | |
172 | if (sclp_running_state == sclp_running_state_running) { | |
173 | /* Break running state and queue NOP read event request | |
174 | * to get a defined interface state. */ | |
175 | __sclp_queue_read_req(); | |
176 | sclp_running_state = sclp_running_state_idle; | |
177 | } | |
178 | } else { | |
179 | __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, | |
180 | sclp_request_timeout, 0); | |
181 | } | |
182 | spin_unlock_irqrestore(&sclp_lock, flags); | |
183 | sclp_process_queue(); | |
184 | } | |
185 | ||
1da177e4 LT |
186 | /* Try to start a request. Return zero if the request was successfully |
187 | * started or if it will be started at a later time. Return non-zero otherwise. | |
188 | * Called while sclp_lock is locked. */ | |
189 | static int | |
190 | __sclp_start_request(struct sclp_req *req) | |
191 | { | |
192 | int rc; | |
193 | ||
194 | if (sclp_running_state != sclp_running_state_idle) | |
195 | return 0; | |
196 | del_timer(&sclp_request_timer); | |
ab14de6c | 197 | rc = sclp_service_call(req->command, req->sccb); |
25fab9eb PO |
198 | req->start_count++; |
199 | ||
1da177e4 | 200 | if (rc == 0) { |
3ad2f3fb | 201 | /* Successfully started request */ |
1da177e4 LT |
202 | req->status = SCLP_REQ_RUNNING; |
203 | sclp_running_state = sclp_running_state_running; | |
204 | __sclp_set_request_timer(SCLP_RETRY_INTERVAL * HZ, | |
205 | sclp_request_timeout, 1); | |
206 | return 0; | |
207 | } else if (rc == -EBUSY) { | |
208 | /* Try again later */ | |
209 | __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, | |
210 | sclp_request_timeout, 0); | |
211 | return 0; | |
212 | } | |
213 | /* Request failed */ | |
214 | req->status = SCLP_REQ_FAILED; | |
215 | return rc; | |
216 | } | |
217 | ||
218 | /* Try to start queued requests. */ | |
219 | static void | |
220 | sclp_process_queue(void) | |
221 | { | |
222 | struct sclp_req *req; | |
223 | int rc; | |
224 | unsigned long flags; | |
225 | ||
226 | spin_lock_irqsave(&sclp_lock, flags); | |
227 | if (sclp_running_state != sclp_running_state_idle) { | |
228 | spin_unlock_irqrestore(&sclp_lock, flags); | |
229 | return; | |
230 | } | |
231 | del_timer(&sclp_request_timer); | |
232 | while (!list_empty(&sclp_req_queue)) { | |
233 | req = list_entry(sclp_req_queue.next, struct sclp_req, list); | |
62b74942 MH |
234 | if (!req->sccb) |
235 | goto do_post; | |
1da177e4 LT |
236 | rc = __sclp_start_request(req); |
237 | if (rc == 0) | |
238 | break; | |
dbd8ae63 PO |
239 | /* Request failed */ |
240 | if (req->start_count > 1) { | |
241 | /* Cannot abort already submitted request - could still | |
242 | * be active at the SCLP */ | |
243 | __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, | |
244 | sclp_request_timeout, 0); | |
245 | break; | |
246 | } | |
62b74942 | 247 | do_post: |
dbd8ae63 | 248 | /* Post-processing for aborted request */ |
1da177e4 LT |
249 | list_del(&req->list); |
250 | if (req->callback) { | |
251 | spin_unlock_irqrestore(&sclp_lock, flags); | |
252 | req->callback(req, req->callback_data); | |
253 | spin_lock_irqsave(&sclp_lock, flags); | |
254 | } | |
255 | } | |
256 | spin_unlock_irqrestore(&sclp_lock, flags); | |
257 | } | |
258 | ||
62b74942 MH |
259 | static int __sclp_can_add_request(struct sclp_req *req) |
260 | { | |
261 | if (req == &sclp_suspend_req || req == &sclp_init_req) | |
262 | return 1; | |
263 | if (sclp_suspend_state != sclp_suspend_state_running) | |
264 | return 0; | |
265 | if (sclp_init_state != sclp_init_state_initialized) | |
266 | return 0; | |
267 | if (sclp_activation_state != sclp_activation_state_active) | |
268 | return 0; | |
269 | return 1; | |
270 | } | |
271 | ||
1da177e4 LT |
272 | /* Queue a new request. Return zero on success, non-zero otherwise. */ |
273 | int | |
274 | sclp_add_request(struct sclp_req *req) | |
275 | { | |
276 | unsigned long flags; | |
277 | int rc; | |
278 | ||
279 | spin_lock_irqsave(&sclp_lock, flags); | |
62b74942 | 280 | if (!__sclp_can_add_request(req)) { |
1da177e4 LT |
281 | spin_unlock_irqrestore(&sclp_lock, flags); |
282 | return -EIO; | |
283 | } | |
284 | req->status = SCLP_REQ_QUEUED; | |
285 | req->start_count = 0; | |
286 | list_add_tail(&req->list, &sclp_req_queue); | |
287 | rc = 0; | |
288 | /* Start if request is first in list */ | |
dbd8ae63 PO |
289 | if (sclp_running_state == sclp_running_state_idle && |
290 | req->list.prev == &sclp_req_queue) { | |
62b74942 MH |
291 | if (!req->sccb) { |
292 | list_del(&req->list); | |
293 | rc = -ENODATA; | |
294 | goto out; | |
295 | } | |
1da177e4 LT |
296 | rc = __sclp_start_request(req); |
297 | if (rc) | |
298 | list_del(&req->list); | |
299 | } | |
62b74942 | 300 | out: |
1da177e4 LT |
301 | spin_unlock_irqrestore(&sclp_lock, flags); |
302 | return rc; | |
303 | } | |
304 | ||
305 | EXPORT_SYMBOL(sclp_add_request); | |
306 | ||
307 | /* Dispatch events found in request buffer to registered listeners. Return 0 | |
308 | * if all events were dispatched, non-zero otherwise. */ | |
309 | static int | |
310 | sclp_dispatch_evbufs(struct sccb_header *sccb) | |
311 | { | |
312 | unsigned long flags; | |
313 | struct evbuf_header *evbuf; | |
314 | struct list_head *l; | |
315 | struct sclp_register *reg; | |
316 | int offset; | |
317 | int rc; | |
318 | ||
319 | spin_lock_irqsave(&sclp_lock, flags); | |
320 | rc = 0; | |
321 | for (offset = sizeof(struct sccb_header); offset < sccb->length; | |
322 | offset += evbuf->length) { | |
1da177e4 | 323 | evbuf = (struct evbuf_header *) ((addr_t) sccb + offset); |
e2e5a0f2 PO |
324 | /* Check for malformed hardware response */ |
325 | if (evbuf->length == 0) | |
326 | break; | |
327 | /* Search for event handler */ | |
1da177e4 LT |
328 | reg = NULL; |
329 | list_for_each(l, &sclp_reg_list) { | |
330 | reg = list_entry(l, struct sclp_register, list); | |
331 | if (reg->receive_mask & (1 << (32 - evbuf->type))) | |
332 | break; | |
333 | else | |
334 | reg = NULL; | |
335 | } | |
336 | if (reg && reg->receiver_fn) { | |
337 | spin_unlock_irqrestore(&sclp_lock, flags); | |
338 | reg->receiver_fn(evbuf); | |
339 | spin_lock_irqsave(&sclp_lock, flags); | |
340 | } else if (reg == NULL) | |
341 | rc = -ENOSYS; | |
342 | } | |
343 | spin_unlock_irqrestore(&sclp_lock, flags); | |
344 | return rc; | |
345 | } | |
346 | ||
347 | /* Read event data request callback. */ | |
348 | static void | |
349 | sclp_read_cb(struct sclp_req *req, void *data) | |
350 | { | |
351 | unsigned long flags; | |
352 | struct sccb_header *sccb; | |
353 | ||
354 | sccb = (struct sccb_header *) req->sccb; | |
355 | if (req->status == SCLP_REQ_DONE && (sccb->response_code == 0x20 || | |
356 | sccb->response_code == 0x220)) | |
357 | sclp_dispatch_evbufs(sccb); | |
358 | spin_lock_irqsave(&sclp_lock, flags); | |
359 | sclp_reading_state = sclp_reading_state_idle; | |
360 | spin_unlock_irqrestore(&sclp_lock, flags); | |
361 | } | |
362 | ||
363 | /* Prepare read event data request. Called while sclp_lock is locked. */ | |
364c8558 | 364 | static void __sclp_make_read_req(void) |
1da177e4 LT |
365 | { |
366 | struct sccb_header *sccb; | |
367 | ||
368 | sccb = (struct sccb_header *) sclp_read_sccb; | |
369 | clear_page(sccb); | |
370 | memset(&sclp_read_req, 0, sizeof(struct sclp_req)); | |
ab14de6c | 371 | sclp_read_req.command = SCLP_CMDW_READ_EVENT_DATA; |
1da177e4 LT |
372 | sclp_read_req.status = SCLP_REQ_QUEUED; |
373 | sclp_read_req.start_count = 0; | |
374 | sclp_read_req.callback = sclp_read_cb; | |
375 | sclp_read_req.sccb = sccb; | |
376 | sccb->length = PAGE_SIZE; | |
377 | sccb->function_code = 0; | |
378 | sccb->control_mask[2] = 0x80; | |
379 | } | |
380 | ||
381 | /* Search request list for request with matching sccb. Return request if found, | |
382 | * NULL otherwise. Called while sclp_lock is locked. */ | |
383 | static inline struct sclp_req * | |
384 | __sclp_find_req(u32 sccb) | |
385 | { | |
386 | struct list_head *l; | |
387 | struct sclp_req *req; | |
388 | ||
389 | list_for_each(l, &sclp_req_queue) { | |
390 | req = list_entry(l, struct sclp_req, list); | |
391 | if (sccb == (u32) (addr_t) req->sccb) | |
392 | return req; | |
393 | } | |
394 | return NULL; | |
395 | } | |
396 | ||
397 | /* Handler for external interruption. Perform request post-processing. | |
398 | * Prepare read event data request if necessary. Start processing of next | |
399 | * request on queue. */ | |
f6649a7e MS |
400 | static void sclp_interrupt_handler(unsigned int ext_int_code, |
401 | unsigned int param32, unsigned long param64) | |
1da177e4 LT |
402 | { |
403 | struct sclp_req *req; | |
404 | u32 finished_sccb; | |
405 | u32 evbuf_pending; | |
406 | ||
052ff461 | 407 | kstat_cpu(smp_processor_id()).irqs[EXTINT_SCP]++; |
1da177e4 | 408 | spin_lock(&sclp_lock); |
f6649a7e MS |
409 | finished_sccb = param32 & 0xfffffff8; |
410 | evbuf_pending = param32 & 0x3; | |
1da177e4 | 411 | if (finished_sccb) { |
dbd8ae63 PO |
412 | del_timer(&sclp_request_timer); |
413 | sclp_running_state = sclp_running_state_reset_pending; | |
1da177e4 LT |
414 | req = __sclp_find_req(finished_sccb); |
415 | if (req) { | |
416 | /* Request post-processing */ | |
417 | list_del(&req->list); | |
418 | req->status = SCLP_REQ_DONE; | |
419 | if (req->callback) { | |
420 | spin_unlock(&sclp_lock); | |
421 | req->callback(req, req->callback_data); | |
422 | spin_lock(&sclp_lock); | |
423 | } | |
424 | } | |
425 | sclp_running_state = sclp_running_state_idle; | |
426 | } | |
d082d3ce | 427 | if (evbuf_pending && |
dbd8ae63 PO |
428 | sclp_activation_state == sclp_activation_state_active) |
429 | __sclp_queue_read_req(); | |
1da177e4 LT |
430 | spin_unlock(&sclp_lock); |
431 | sclp_process_queue(); | |
432 | } | |
433 | ||
1da177e4 LT |
434 | /* Convert interval in jiffies to TOD ticks. */ |
435 | static inline u64 | |
436 | sclp_tod_from_jiffies(unsigned long jiffies) | |
437 | { | |
438 | return (u64) (jiffies / HZ) << 32; | |
439 | } | |
440 | ||
441 | /* Wait until a currently running request finished. Note: while this function | |
442 | * is running, no timers are served on the calling CPU. */ | |
443 | void | |
444 | sclp_sync_wait(void) | |
445 | { | |
934b2857 | 446 | unsigned long long old_tick; |
1f194a4c | 447 | unsigned long flags; |
1da177e4 LT |
448 | unsigned long cr0, cr0_sync; |
449 | u64 timeout; | |
c59d744b | 450 | int irq_context; |
1da177e4 LT |
451 | |
452 | /* We'll be disabling timer interrupts, so we need a custom timeout | |
453 | * mechanism */ | |
454 | timeout = 0; | |
455 | if (timer_pending(&sclp_request_timer)) { | |
456 | /* Get timeout TOD value */ | |
94c12cc7 | 457 | timeout = get_clock() + |
1da177e4 LT |
458 | sclp_tod_from_jiffies(sclp_request_timer.expires - |
459 | jiffies); | |
460 | } | |
1f194a4c | 461 | local_irq_save(flags); |
1da177e4 | 462 | /* Prevent bottom half from executing once we force interrupts open */ |
c59d744b HC |
463 | irq_context = in_interrupt(); |
464 | if (!irq_context) | |
465 | local_bh_disable(); | |
1da177e4 | 466 | /* Enable service-signal interruption, disable timer interrupts */ |
934b2857 | 467 | old_tick = local_tick_disable(); |
1f194a4c | 468 | trace_hardirqs_on(); |
1da177e4 LT |
469 | __ctl_store(cr0, 0, 0); |
470 | cr0_sync = cr0; | |
934b2857 | 471 | cr0_sync &= 0xffff00a0; |
1da177e4 | 472 | cr0_sync |= 0x00000200; |
1da177e4 | 473 | __ctl_load(cr0_sync, 0, 0); |
df9ee292 | 474 | __arch_local_irq_stosm(0x01); |
1da177e4 LT |
475 | /* Loop until driver state indicates finished request */ |
476 | while (sclp_running_state != sclp_running_state_idle) { | |
477 | /* Check for expired request timer */ | |
478 | if (timer_pending(&sclp_request_timer) && | |
94c12cc7 | 479 | get_clock() > timeout && |
1da177e4 LT |
480 | del_timer(&sclp_request_timer)) |
481 | sclp_request_timer.function(sclp_request_timer.data); | |
1da177e4 LT |
482 | cpu_relax(); |
483 | } | |
1f194a4c | 484 | local_irq_disable(); |
1da177e4 | 485 | __ctl_load(cr0, 0, 0); |
c59d744b HC |
486 | if (!irq_context) |
487 | _local_bh_enable(); | |
934b2857 | 488 | local_tick_enable(old_tick); |
1f194a4c | 489 | local_irq_restore(flags); |
1da177e4 | 490 | } |
1da177e4 LT |
491 | EXPORT_SYMBOL(sclp_sync_wait); |
492 | ||
493 | /* Dispatch changes in send and receive mask to registered listeners. */ | |
4d284cac | 494 | static void |
1da177e4 LT |
495 | sclp_dispatch_state_change(void) |
496 | { | |
497 | struct list_head *l; | |
498 | struct sclp_register *reg; | |
499 | unsigned long flags; | |
500 | sccb_mask_t receive_mask; | |
501 | sccb_mask_t send_mask; | |
502 | ||
503 | do { | |
504 | spin_lock_irqsave(&sclp_lock, flags); | |
505 | reg = NULL; | |
506 | list_for_each(l, &sclp_reg_list) { | |
507 | reg = list_entry(l, struct sclp_register, list); | |
d082d3ce PO |
508 | receive_mask = reg->send_mask & sclp_receive_mask; |
509 | send_mask = reg->receive_mask & sclp_send_mask; | |
1da177e4 LT |
510 | if (reg->sclp_receive_mask != receive_mask || |
511 | reg->sclp_send_mask != send_mask) { | |
512 | reg->sclp_receive_mask = receive_mask; | |
513 | reg->sclp_send_mask = send_mask; | |
514 | break; | |
515 | } else | |
516 | reg = NULL; | |
517 | } | |
518 | spin_unlock_irqrestore(&sclp_lock, flags); | |
519 | if (reg && reg->state_change_fn) | |
520 | reg->state_change_fn(reg); | |
521 | } while (reg); | |
522 | } | |
523 | ||
524 | struct sclp_statechangebuf { | |
525 | struct evbuf_header header; | |
526 | u8 validity_sclp_active_facility_mask : 1; | |
527 | u8 validity_sclp_receive_mask : 1; | |
528 | u8 validity_sclp_send_mask : 1; | |
529 | u8 validity_read_data_function_mask : 1; | |
530 | u16 _zeros : 12; | |
531 | u16 mask_length; | |
532 | u64 sclp_active_facility_mask; | |
533 | sccb_mask_t sclp_receive_mask; | |
534 | sccb_mask_t sclp_send_mask; | |
535 | u32 read_data_function_mask; | |
536 | } __attribute__((packed)); | |
537 | ||
538 | ||
539 | /* State change event callback. Inform listeners of changes. */ | |
540 | static void | |
541 | sclp_state_change_cb(struct evbuf_header *evbuf) | |
542 | { | |
543 | unsigned long flags; | |
544 | struct sclp_statechangebuf *scbuf; | |
545 | ||
546 | scbuf = (struct sclp_statechangebuf *) evbuf; | |
547 | if (scbuf->mask_length != sizeof(sccb_mask_t)) | |
548 | return; | |
549 | spin_lock_irqsave(&sclp_lock, flags); | |
550 | if (scbuf->validity_sclp_receive_mask) | |
551 | sclp_receive_mask = scbuf->sclp_receive_mask; | |
552 | if (scbuf->validity_sclp_send_mask) | |
553 | sclp_send_mask = scbuf->sclp_send_mask; | |
554 | spin_unlock_irqrestore(&sclp_lock, flags); | |
887d935a HC |
555 | if (scbuf->validity_sclp_active_facility_mask) |
556 | sclp_facilities = scbuf->sclp_active_facility_mask; | |
1da177e4 LT |
557 | sclp_dispatch_state_change(); |
558 | } | |
559 | ||
560 | static struct sclp_register sclp_state_change_event = { | |
6d4740c8 | 561 | .receive_mask = EVTYP_STATECHANGE_MASK, |
1da177e4 LT |
562 | .receiver_fn = sclp_state_change_cb |
563 | }; | |
564 | ||
565 | /* Calculate receive and send mask of currently registered listeners. | |
566 | * Called while sclp_lock is locked. */ | |
567 | static inline void | |
568 | __sclp_get_mask(sccb_mask_t *receive_mask, sccb_mask_t *send_mask) | |
569 | { | |
570 | struct list_head *l; | |
571 | struct sclp_register *t; | |
572 | ||
573 | *receive_mask = 0; | |
574 | *send_mask = 0; | |
575 | list_for_each(l, &sclp_reg_list) { | |
576 | t = list_entry(l, struct sclp_register, list); | |
577 | *receive_mask |= t->receive_mask; | |
578 | *send_mask |= t->send_mask; | |
579 | } | |
580 | } | |
581 | ||
582 | /* Register event listener. Return 0 on success, non-zero otherwise. */ | |
583 | int | |
584 | sclp_register(struct sclp_register *reg) | |
585 | { | |
586 | unsigned long flags; | |
587 | sccb_mask_t receive_mask; | |
588 | sccb_mask_t send_mask; | |
589 | int rc; | |
590 | ||
591 | rc = sclp_init(); | |
592 | if (rc) | |
593 | return rc; | |
594 | spin_lock_irqsave(&sclp_lock, flags); | |
595 | /* Check event mask for collisions */ | |
596 | __sclp_get_mask(&receive_mask, &send_mask); | |
597 | if (reg->receive_mask & receive_mask || reg->send_mask & send_mask) { | |
598 | spin_unlock_irqrestore(&sclp_lock, flags); | |
599 | return -EBUSY; | |
600 | } | |
601 | /* Trigger initial state change callback */ | |
602 | reg->sclp_receive_mask = 0; | |
603 | reg->sclp_send_mask = 0; | |
62b74942 | 604 | reg->pm_event_posted = 0; |
1da177e4 LT |
605 | list_add(®->list, &sclp_reg_list); |
606 | spin_unlock_irqrestore(&sclp_lock, flags); | |
607 | rc = sclp_init_mask(1); | |
608 | if (rc) { | |
609 | spin_lock_irqsave(&sclp_lock, flags); | |
610 | list_del(®->list); | |
611 | spin_unlock_irqrestore(&sclp_lock, flags); | |
612 | } | |
613 | return rc; | |
614 | } | |
615 | ||
616 | EXPORT_SYMBOL(sclp_register); | |
617 | ||
618 | /* Unregister event listener. */ | |
619 | void | |
620 | sclp_unregister(struct sclp_register *reg) | |
621 | { | |
622 | unsigned long flags; | |
623 | ||
624 | spin_lock_irqsave(&sclp_lock, flags); | |
625 | list_del(®->list); | |
626 | spin_unlock_irqrestore(&sclp_lock, flags); | |
627 | sclp_init_mask(1); | |
628 | } | |
629 | ||
630 | EXPORT_SYMBOL(sclp_unregister); | |
631 | ||
632 | /* Remove event buffers which are marked processed. Return the number of | |
633 | * remaining event buffers. */ | |
634 | int | |
635 | sclp_remove_processed(struct sccb_header *sccb) | |
636 | { | |
637 | struct evbuf_header *evbuf; | |
638 | int unprocessed; | |
639 | u16 remaining; | |
640 | ||
641 | evbuf = (struct evbuf_header *) (sccb + 1); | |
642 | unprocessed = 0; | |
643 | remaining = sccb->length - sizeof(struct sccb_header); | |
644 | while (remaining > 0) { | |
645 | remaining -= evbuf->length; | |
646 | if (evbuf->flags & 0x80) { | |
647 | sccb->length -= evbuf->length; | |
648 | memcpy(evbuf, (void *) ((addr_t) evbuf + evbuf->length), | |
649 | remaining); | |
650 | } else { | |
651 | unprocessed++; | |
652 | evbuf = (struct evbuf_header *) | |
653 | ((addr_t) evbuf + evbuf->length); | |
654 | } | |
655 | } | |
656 | return unprocessed; | |
657 | } | |
658 | ||
659 | EXPORT_SYMBOL(sclp_remove_processed); | |
660 | ||
661 | struct init_sccb { | |
662 | struct sccb_header header; | |
663 | u16 _reserved; | |
664 | u16 mask_length; | |
665 | sccb_mask_t receive_mask; | |
666 | sccb_mask_t send_mask; | |
1da177e4 | 667 | sccb_mask_t sclp_receive_mask; |
d082d3ce | 668 | sccb_mask_t sclp_send_mask; |
1da177e4 LT |
669 | } __attribute__((packed)); |
670 | ||
671 | /* Prepare init mask request. Called while sclp_lock is locked. */ | |
672 | static inline void | |
673 | __sclp_make_init_req(u32 receive_mask, u32 send_mask) | |
674 | { | |
675 | struct init_sccb *sccb; | |
676 | ||
677 | sccb = (struct init_sccb *) sclp_init_sccb; | |
678 | clear_page(sccb); | |
679 | memset(&sclp_init_req, 0, sizeof(struct sclp_req)); | |
ab14de6c | 680 | sclp_init_req.command = SCLP_CMDW_WRITE_EVENT_MASK; |
1da177e4 LT |
681 | sclp_init_req.status = SCLP_REQ_FILLED; |
682 | sclp_init_req.start_count = 0; | |
683 | sclp_init_req.callback = NULL; | |
684 | sclp_init_req.callback_data = NULL; | |
685 | sclp_init_req.sccb = sccb; | |
686 | sccb->header.length = sizeof(struct init_sccb); | |
687 | sccb->mask_length = sizeof(sccb_mask_t); | |
688 | sccb->receive_mask = receive_mask; | |
689 | sccb->send_mask = send_mask; | |
690 | sccb->sclp_receive_mask = 0; | |
691 | sccb->sclp_send_mask = 0; | |
692 | } | |
693 | ||
694 | /* Start init mask request. If calculate is non-zero, calculate the mask as | |
695 | * requested by registered listeners. Use zero mask otherwise. Return 0 on | |
696 | * success, non-zero otherwise. */ | |
697 | static int | |
698 | sclp_init_mask(int calculate) | |
699 | { | |
700 | unsigned long flags; | |
701 | struct init_sccb *sccb = (struct init_sccb *) sclp_init_sccb; | |
702 | sccb_mask_t receive_mask; | |
703 | sccb_mask_t send_mask; | |
704 | int retry; | |
705 | int rc; | |
706 | unsigned long wait; | |
707 | ||
708 | spin_lock_irqsave(&sclp_lock, flags); | |
709 | /* Check if interface is in appropriate state */ | |
710 | if (sclp_mask_state != sclp_mask_state_idle) { | |
711 | spin_unlock_irqrestore(&sclp_lock, flags); | |
712 | return -EBUSY; | |
713 | } | |
714 | if (sclp_activation_state == sclp_activation_state_inactive) { | |
715 | spin_unlock_irqrestore(&sclp_lock, flags); | |
716 | return -EINVAL; | |
717 | } | |
718 | sclp_mask_state = sclp_mask_state_initializing; | |
719 | /* Determine mask */ | |
720 | if (calculate) | |
721 | __sclp_get_mask(&receive_mask, &send_mask); | |
722 | else { | |
723 | receive_mask = 0; | |
724 | send_mask = 0; | |
725 | } | |
726 | rc = -EIO; | |
727 | for (retry = 0; retry <= SCLP_MASK_RETRY; retry++) { | |
728 | /* Prepare request */ | |
729 | __sclp_make_init_req(receive_mask, send_mask); | |
730 | spin_unlock_irqrestore(&sclp_lock, flags); | |
731 | if (sclp_add_request(&sclp_init_req)) { | |
732 | /* Try again later */ | |
733 | wait = jiffies + SCLP_BUSY_INTERVAL * HZ; | |
734 | while (time_before(jiffies, wait)) | |
735 | sclp_sync_wait(); | |
736 | spin_lock_irqsave(&sclp_lock, flags); | |
737 | continue; | |
738 | } | |
739 | while (sclp_init_req.status != SCLP_REQ_DONE && | |
740 | sclp_init_req.status != SCLP_REQ_FAILED) | |
741 | sclp_sync_wait(); | |
742 | spin_lock_irqsave(&sclp_lock, flags); | |
743 | if (sclp_init_req.status == SCLP_REQ_DONE && | |
744 | sccb->header.response_code == 0x20) { | |
745 | /* Successful request */ | |
746 | if (calculate) { | |
747 | sclp_receive_mask = sccb->sclp_receive_mask; | |
748 | sclp_send_mask = sccb->sclp_send_mask; | |
749 | } else { | |
750 | sclp_receive_mask = 0; | |
751 | sclp_send_mask = 0; | |
752 | } | |
753 | spin_unlock_irqrestore(&sclp_lock, flags); | |
754 | sclp_dispatch_state_change(); | |
755 | spin_lock_irqsave(&sclp_lock, flags); | |
756 | rc = 0; | |
757 | break; | |
758 | } | |
759 | } | |
760 | sclp_mask_state = sclp_mask_state_idle; | |
761 | spin_unlock_irqrestore(&sclp_lock, flags); | |
762 | return rc; | |
763 | } | |
764 | ||
765 | /* Deactivate SCLP interface. On success, new requests will be rejected, | |
766 | * events will no longer be dispatched. Return 0 on success, non-zero | |
767 | * otherwise. */ | |
768 | int | |
769 | sclp_deactivate(void) | |
770 | { | |
771 | unsigned long flags; | |
772 | int rc; | |
773 | ||
774 | spin_lock_irqsave(&sclp_lock, flags); | |
775 | /* Deactivate can only be called when active */ | |
776 | if (sclp_activation_state != sclp_activation_state_active) { | |
777 | spin_unlock_irqrestore(&sclp_lock, flags); | |
778 | return -EINVAL; | |
779 | } | |
780 | sclp_activation_state = sclp_activation_state_deactivating; | |
781 | spin_unlock_irqrestore(&sclp_lock, flags); | |
782 | rc = sclp_init_mask(0); | |
783 | spin_lock_irqsave(&sclp_lock, flags); | |
784 | if (rc == 0) | |
785 | sclp_activation_state = sclp_activation_state_inactive; | |
786 | else | |
787 | sclp_activation_state = sclp_activation_state_active; | |
788 | spin_unlock_irqrestore(&sclp_lock, flags); | |
789 | return rc; | |
790 | } | |
791 | ||
792 | EXPORT_SYMBOL(sclp_deactivate); | |
793 | ||
794 | /* Reactivate SCLP interface after sclp_deactivate. On success, new | |
795 | * requests will be accepted, events will be dispatched again. Return 0 on | |
796 | * success, non-zero otherwise. */ | |
797 | int | |
798 | sclp_reactivate(void) | |
799 | { | |
800 | unsigned long flags; | |
801 | int rc; | |
802 | ||
803 | spin_lock_irqsave(&sclp_lock, flags); | |
804 | /* Reactivate can only be called when inactive */ | |
805 | if (sclp_activation_state != sclp_activation_state_inactive) { | |
806 | spin_unlock_irqrestore(&sclp_lock, flags); | |
807 | return -EINVAL; | |
808 | } | |
809 | sclp_activation_state = sclp_activation_state_activating; | |
810 | spin_unlock_irqrestore(&sclp_lock, flags); | |
811 | rc = sclp_init_mask(1); | |
812 | spin_lock_irqsave(&sclp_lock, flags); | |
813 | if (rc == 0) | |
814 | sclp_activation_state = sclp_activation_state_active; | |
815 | else | |
816 | sclp_activation_state = sclp_activation_state_inactive; | |
817 | spin_unlock_irqrestore(&sclp_lock, flags); | |
818 | return rc; | |
819 | } | |
820 | ||
821 | EXPORT_SYMBOL(sclp_reactivate); | |
822 | ||
823 | /* Handler for external interruption used during initialization. Modify | |
824 | * request state to done. */ | |
f6649a7e MS |
825 | static void sclp_check_handler(unsigned int ext_int_code, |
826 | unsigned int param32, unsigned long param64) | |
1da177e4 LT |
827 | { |
828 | u32 finished_sccb; | |
829 | ||
052ff461 | 830 | kstat_cpu(smp_processor_id()).irqs[EXTINT_SCP]++; |
f6649a7e | 831 | finished_sccb = param32 & 0xfffffff8; |
1da177e4 LT |
832 | /* Is this the interrupt we are waiting for? */ |
833 | if (finished_sccb == 0) | |
834 | return; | |
a12c53f4 MS |
835 | if (finished_sccb != (u32) (addr_t) sclp_init_sccb) |
836 | panic("sclp: unsolicited interrupt for buffer at 0x%x\n", | |
837 | finished_sccb); | |
1da177e4 LT |
838 | spin_lock(&sclp_lock); |
839 | if (sclp_running_state == sclp_running_state_running) { | |
840 | sclp_init_req.status = SCLP_REQ_DONE; | |
841 | sclp_running_state = sclp_running_state_idle; | |
842 | } | |
843 | spin_unlock(&sclp_lock); | |
844 | } | |
845 | ||
846 | /* Initial init mask request timed out. Modify request state to failed. */ | |
847 | static void | |
848 | sclp_check_timeout(unsigned long data) | |
849 | { | |
850 | unsigned long flags; | |
851 | ||
852 | spin_lock_irqsave(&sclp_lock, flags); | |
853 | if (sclp_running_state == sclp_running_state_running) { | |
854 | sclp_init_req.status = SCLP_REQ_FAILED; | |
855 | sclp_running_state = sclp_running_state_idle; | |
856 | } | |
857 | spin_unlock_irqrestore(&sclp_lock, flags); | |
858 | } | |
859 | ||
860 | /* Perform a check of the SCLP interface. Return zero if the interface is | |
861 | * available and there are no pending requests from a previous instance. | |
862 | * Return non-zero otherwise. */ | |
863 | static int | |
864 | sclp_check_interface(void) | |
865 | { | |
866 | struct init_sccb *sccb; | |
867 | unsigned long flags; | |
868 | int retry; | |
869 | int rc; | |
870 | ||
871 | spin_lock_irqsave(&sclp_lock, flags); | |
872 | /* Prepare init mask command */ | |
873 | rc = register_early_external_interrupt(0x2401, sclp_check_handler, | |
874 | &ext_int_info_hwc); | |
875 | if (rc) { | |
876 | spin_unlock_irqrestore(&sclp_lock, flags); | |
877 | return rc; | |
878 | } | |
879 | for (retry = 0; retry <= SCLP_INIT_RETRY; retry++) { | |
880 | __sclp_make_init_req(0, 0); | |
881 | sccb = (struct init_sccb *) sclp_init_req.sccb; | |
ab14de6c | 882 | rc = sclp_service_call(sclp_init_req.command, sccb); |
1da177e4 LT |
883 | if (rc == -EIO) |
884 | break; | |
885 | sclp_init_req.status = SCLP_REQ_RUNNING; | |
886 | sclp_running_state = sclp_running_state_running; | |
887 | __sclp_set_request_timer(SCLP_RETRY_INTERVAL * HZ, | |
888 | sclp_check_timeout, 0); | |
889 | spin_unlock_irqrestore(&sclp_lock, flags); | |
890 | /* Enable service-signal interruption - needs to happen | |
891 | * with IRQs enabled. */ | |
892 | ctl_set_bit(0, 9); | |
893 | /* Wait for signal from interrupt or timeout */ | |
894 | sclp_sync_wait(); | |
895 | /* Disable service-signal interruption - needs to happen | |
896 | * with IRQs enabled. */ | |
897 | ctl_clear_bit(0,9); | |
898 | spin_lock_irqsave(&sclp_lock, flags); | |
899 | del_timer(&sclp_request_timer); | |
900 | if (sclp_init_req.status == SCLP_REQ_DONE && | |
901 | sccb->header.response_code == 0x20) { | |
902 | rc = 0; | |
903 | break; | |
904 | } else | |
905 | rc = -EBUSY; | |
906 | } | |
907 | unregister_early_external_interrupt(0x2401, sclp_check_handler, | |
908 | &ext_int_info_hwc); | |
909 | spin_unlock_irqrestore(&sclp_lock, flags); | |
910 | return rc; | |
911 | } | |
912 | ||
913 | /* Reboot event handler. Reset send and receive mask to prevent pending SCLP | |
914 | * events from interfering with rebooted system. */ | |
915 | static int | |
916 | sclp_reboot_event(struct notifier_block *this, unsigned long event, void *ptr) | |
917 | { | |
918 | sclp_deactivate(); | |
919 | return NOTIFY_DONE; | |
920 | } | |
921 | ||
922 | static struct notifier_block sclp_reboot_notifier = { | |
923 | .notifier_call = sclp_reboot_event | |
924 | }; | |
925 | ||
62b74942 MH |
926 | /* |
927 | * Suspend/resume SCLP notifier implementation | |
928 | */ | |
929 | ||
930 | static void sclp_pm_event(enum sclp_pm_event sclp_pm_event, int rollback) | |
931 | { | |
932 | struct sclp_register *reg; | |
933 | unsigned long flags; | |
934 | ||
935 | if (!rollback) { | |
936 | spin_lock_irqsave(&sclp_lock, flags); | |
937 | list_for_each_entry(reg, &sclp_reg_list, list) | |
938 | reg->pm_event_posted = 0; | |
939 | spin_unlock_irqrestore(&sclp_lock, flags); | |
940 | } | |
941 | do { | |
942 | spin_lock_irqsave(&sclp_lock, flags); | |
943 | list_for_each_entry(reg, &sclp_reg_list, list) { | |
944 | if (rollback && reg->pm_event_posted) | |
945 | goto found; | |
946 | if (!rollback && !reg->pm_event_posted) | |
947 | goto found; | |
948 | } | |
949 | spin_unlock_irqrestore(&sclp_lock, flags); | |
950 | return; | |
951 | found: | |
952 | spin_unlock_irqrestore(&sclp_lock, flags); | |
953 | if (reg->pm_event_fn) | |
954 | reg->pm_event_fn(reg, sclp_pm_event); | |
955 | reg->pm_event_posted = rollback ? 0 : 1; | |
956 | } while (1); | |
957 | } | |
958 | ||
959 | /* | |
960 | * Susend/resume callbacks for platform device | |
961 | */ | |
962 | ||
963 | static int sclp_freeze(struct device *dev) | |
964 | { | |
965 | unsigned long flags; | |
966 | int rc; | |
967 | ||
968 | sclp_pm_event(SCLP_PM_EVENT_FREEZE, 0); | |
969 | ||
970 | spin_lock_irqsave(&sclp_lock, flags); | |
971 | sclp_suspend_state = sclp_suspend_state_suspended; | |
972 | spin_unlock_irqrestore(&sclp_lock, flags); | |
973 | ||
974 | /* Init supend data */ | |
975 | memset(&sclp_suspend_req, 0, sizeof(sclp_suspend_req)); | |
976 | sclp_suspend_req.callback = sclp_suspend_req_cb; | |
977 | sclp_suspend_req.status = SCLP_REQ_FILLED; | |
978 | init_completion(&sclp_request_queue_flushed); | |
979 | ||
980 | rc = sclp_add_request(&sclp_suspend_req); | |
981 | if (rc == 0) | |
982 | wait_for_completion(&sclp_request_queue_flushed); | |
983 | else if (rc != -ENODATA) | |
984 | goto fail_thaw; | |
985 | ||
986 | rc = sclp_deactivate(); | |
987 | if (rc) | |
988 | goto fail_thaw; | |
989 | return 0; | |
990 | ||
991 | fail_thaw: | |
992 | spin_lock_irqsave(&sclp_lock, flags); | |
993 | sclp_suspend_state = sclp_suspend_state_running; | |
994 | spin_unlock_irqrestore(&sclp_lock, flags); | |
995 | sclp_pm_event(SCLP_PM_EVENT_THAW, 1); | |
996 | return rc; | |
997 | } | |
998 | ||
999 | static int sclp_undo_suspend(enum sclp_pm_event event) | |
1000 | { | |
1001 | unsigned long flags; | |
1002 | int rc; | |
1003 | ||
1004 | rc = sclp_reactivate(); | |
1005 | if (rc) | |
1006 | return rc; | |
1007 | ||
1008 | spin_lock_irqsave(&sclp_lock, flags); | |
1009 | sclp_suspend_state = sclp_suspend_state_running; | |
1010 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1011 | ||
1012 | sclp_pm_event(event, 0); | |
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | static int sclp_thaw(struct device *dev) | |
1017 | { | |
1018 | return sclp_undo_suspend(SCLP_PM_EVENT_THAW); | |
1019 | } | |
1020 | ||
1021 | static int sclp_restore(struct device *dev) | |
1022 | { | |
1023 | return sclp_undo_suspend(SCLP_PM_EVENT_RESTORE); | |
1024 | } | |
1025 | ||
47145210 | 1026 | static const struct dev_pm_ops sclp_pm_ops = { |
62b74942 MH |
1027 | .freeze = sclp_freeze, |
1028 | .thaw = sclp_thaw, | |
1029 | .restore = sclp_restore, | |
1030 | }; | |
1031 | ||
1032 | static struct platform_driver sclp_pdrv = { | |
1033 | .driver = { | |
1034 | .name = "sclp", | |
1035 | .owner = THIS_MODULE, | |
1036 | .pm = &sclp_pm_ops, | |
1037 | }, | |
1038 | }; | |
1039 | ||
1040 | static struct platform_device *sclp_pdev; | |
1041 | ||
1da177e4 LT |
1042 | /* Initialize SCLP driver. Return zero if driver is operational, non-zero |
1043 | * otherwise. */ | |
1044 | static int | |
1045 | sclp_init(void) | |
1046 | { | |
1047 | unsigned long flags; | |
62b74942 | 1048 | int rc = 0; |
1da177e4 | 1049 | |
1da177e4 LT |
1050 | spin_lock_irqsave(&sclp_lock, flags); |
1051 | /* Check for previous or running initialization */ | |
62b74942 MH |
1052 | if (sclp_init_state != sclp_init_state_uninitialized) |
1053 | goto fail_unlock; | |
1da177e4 LT |
1054 | sclp_init_state = sclp_init_state_initializing; |
1055 | /* Set up variables */ | |
1056 | INIT_LIST_HEAD(&sclp_req_queue); | |
1057 | INIT_LIST_HEAD(&sclp_reg_list); | |
1058 | list_add(&sclp_state_change_event.list, &sclp_reg_list); | |
1059 | init_timer(&sclp_request_timer); | |
1060 | /* Check interface */ | |
1061 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1062 | rc = sclp_check_interface(); | |
1063 | spin_lock_irqsave(&sclp_lock, flags); | |
62b74942 MH |
1064 | if (rc) |
1065 | goto fail_init_state_uninitialized; | |
1da177e4 LT |
1066 | /* Register reboot handler */ |
1067 | rc = register_reboot_notifier(&sclp_reboot_notifier); | |
62b74942 MH |
1068 | if (rc) |
1069 | goto fail_init_state_uninitialized; | |
1da177e4 LT |
1070 | /* Register interrupt handler */ |
1071 | rc = register_early_external_interrupt(0x2401, sclp_interrupt_handler, | |
1072 | &ext_int_info_hwc); | |
62b74942 MH |
1073 | if (rc) |
1074 | goto fail_unregister_reboot_notifier; | |
1da177e4 LT |
1075 | sclp_init_state = sclp_init_state_initialized; |
1076 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1077 | /* Enable service-signal external interruption - needs to happen with | |
1078 | * IRQs enabled. */ | |
1079 | ctl_set_bit(0, 9); | |
1080 | sclp_init_mask(1); | |
1081 | return 0; | |
62b74942 MH |
1082 | |
1083 | fail_unregister_reboot_notifier: | |
1084 | unregister_reboot_notifier(&sclp_reboot_notifier); | |
1085 | fail_init_state_uninitialized: | |
1086 | sclp_init_state = sclp_init_state_uninitialized; | |
1087 | fail_unlock: | |
1088 | spin_unlock_irqrestore(&sclp_lock, flags); | |
1089 | return rc; | |
1da177e4 | 1090 | } |
b3d00c3b | 1091 | |
62b74942 MH |
1092 | /* |
1093 | * SCLP panic notifier: If we are suspended, we thaw SCLP in order to be able | |
1094 | * to print the panic message. | |
1095 | */ | |
1096 | static int sclp_panic_notify(struct notifier_block *self, | |
1097 | unsigned long event, void *data) | |
1098 | { | |
1099 | if (sclp_suspend_state == sclp_suspend_state_suspended) | |
1100 | sclp_undo_suspend(SCLP_PM_EVENT_THAW); | |
1101 | return NOTIFY_OK; | |
1102 | } | |
1103 | ||
1104 | static struct notifier_block sclp_on_panic_nb = { | |
1105 | .notifier_call = sclp_panic_notify, | |
1106 | .priority = SCLP_PANIC_PRIO, | |
1107 | }; | |
1108 | ||
b3d00c3b PO |
1109 | static __init int sclp_initcall(void) |
1110 | { | |
62b74942 MH |
1111 | int rc; |
1112 | ||
1113 | rc = platform_driver_register(&sclp_pdrv); | |
1114 | if (rc) | |
1115 | return rc; | |
1116 | sclp_pdev = platform_device_register_simple("sclp", -1, NULL, 0); | |
1117 | rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0; | |
1118 | if (rc) | |
1119 | goto fail_platform_driver_unregister; | |
1120 | rc = atomic_notifier_chain_register(&panic_notifier_list, | |
1121 | &sclp_on_panic_nb); | |
1122 | if (rc) | |
1123 | goto fail_platform_device_unregister; | |
1124 | ||
b3d00c3b | 1125 | return sclp_init(); |
62b74942 MH |
1126 | |
1127 | fail_platform_device_unregister: | |
1128 | platform_device_unregister(sclp_pdev); | |
1129 | fail_platform_driver_unregister: | |
1130 | platform_driver_unregister(&sclp_pdrv); | |
1131 | return rc; | |
b3d00c3b PO |
1132 | } |
1133 | ||
1134 | arch_initcall(sclp_initcall); |