1 /*
2 * ipmi_watchdog.c
3 *
4 * A watchdog timer based upon the IPMI interface.
5 *
6 * Author: MontaVista Software, Inc.
7 * Corey Minyard <minyard@mvista.com>
8 * source@mvista.com
9 *
10 * Copyright 2002 MontaVista Software Inc.
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
16 *
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
24 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
26 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
27 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * You should have received a copy of the GNU General Public License along
30 * with this program; if not, write to the Free Software Foundation, Inc.,
31 * 675 Mass Ave, Cambridge, MA 02139, USA.
32 */
33
34 #include <linux/module.h>
35 #include <linux/moduleparam.h>
36 #include <linux/ipmi.h>
37 #include <linux/ipmi_smi.h>
38 #include <linux/mutex.h>
39 #include <linux/watchdog.h>
40 #include <linux/miscdevice.h>
41 #include <linux/init.h>
42 #include <linux/completion.h>
43 #include <linux/kdebug.h>
44 #include <linux/rwsem.h>
45 #include <linux/errno.h>
46 #include <asm/uaccess.h>
47 #include <linux/notifier.h>
48 #include <linux/nmi.h>
49 #include <linux/reboot.h>
50 #include <linux/wait.h>
51 #include <linux/poll.h>
52 #include <linux/string.h>
53 #include <linux/ctype.h>
54 #include <linux/delay.h>
55 #include <asm/atomic.h>
56
57 #ifdef CONFIG_X86
58 /*
59 * This is ugly, but I've determined that x86 is the only architecture
60 * that can reasonably support the IPMI NMI watchdog timeout at this
61 * time. If another architecture adds this capability somehow, it
62 * will have to be a somewhat different mechanism and I have no idea
63 * how it will work. So in the unlikely event that another
64 * architecture supports this, we can figure out a good generic
65 * mechanism for it at that time.
66 */
67 #include <asm/kdebug.h>
68 #define HAVE_DIE_NMI
69 #endif
70
71 #define PFX "IPMI Watchdog: "
72
73 /*
74 * The IPMI command/response information for the watchdog timer.
75 */
76
77 /* values for byte 1 of the set command, byte 2 of the get response. */
78 #define WDOG_DONT_LOG (1 << 7)
79 #define WDOG_DONT_STOP_ON_SET (1 << 6)
80 #define WDOG_SET_TIMER_USE(byte, use) \
81 byte = ((byte) & 0xf8) | ((use) & 0x7)
82 #define WDOG_GET_TIMER_USE(byte) ((byte) & 0x7)
83 #define WDOG_TIMER_USE_BIOS_FRB2 1
84 #define WDOG_TIMER_USE_BIOS_POST 2
85 #define WDOG_TIMER_USE_OS_LOAD 3
86 #define WDOG_TIMER_USE_SMS_OS 4
87 #define WDOG_TIMER_USE_OEM 5
88
89 /* values for byte 2 of the set command, byte 3 of the get response. */
90 #define WDOG_SET_PRETIMEOUT_ACT(byte, use) \
91 byte = ((byte) & 0x8f) | (((use) & 0x7) << 4)
92 #define WDOG_GET_PRETIMEOUT_ACT(byte) (((byte) >> 4) & 0x7)
93 #define WDOG_PRETIMEOUT_NONE 0
94 #define WDOG_PRETIMEOUT_SMI 1
95 #define WDOG_PRETIMEOUT_NMI 2
96 #define WDOG_PRETIMEOUT_MSG_INT 3
97
98 /* Operations that can be performed on a pretimout. */
99 #define WDOG_PREOP_NONE 0
100 #define WDOG_PREOP_PANIC 1
101 /* Cause data to be available to read. Doesn't work in NMI mode. */
102 #define WDOG_PREOP_GIVE_DATA 2
103
104 /* Actions to perform on a full timeout. */
105 #define WDOG_SET_TIMEOUT_ACT(byte, use) \
106 byte = ((byte) & 0xf8) | ((use) & 0x7)
107 #define WDOG_GET_TIMEOUT_ACT(byte) ((byte) & 0x7)
108 #define WDOG_TIMEOUT_NONE 0
109 #define WDOG_TIMEOUT_RESET 1
110 #define WDOG_TIMEOUT_POWER_DOWN 2
111 #define WDOG_TIMEOUT_POWER_CYCLE 3
112
113 /*
114 * Byte 3 of the get command, byte 4 of the get response is the
115 * pre-timeout in seconds.
116 */
117
118 /* Bits for setting byte 4 of the set command, byte 5 of the get response. */
119 #define WDOG_EXPIRE_CLEAR_BIOS_FRB2 (1 << 1)
120 #define WDOG_EXPIRE_CLEAR_BIOS_POST (1 << 2)
121 #define WDOG_EXPIRE_CLEAR_OS_LOAD (1 << 3)
122 #define WDOG_EXPIRE_CLEAR_SMS_OS (1 << 4)
123 #define WDOG_EXPIRE_CLEAR_OEM (1 << 5)
124
125 /*
126 * Setting/getting the watchdog timer value. This is for bytes 5 and
127 * 6 (the timeout time) of the set command, and bytes 6 and 7 (the
128 * timeout time) and 8 and 9 (the current countdown value) of the
129 * response. The timeout value is given in seconds (in the command it
130 * is 100ms intervals).
131 */
132 #define WDOG_SET_TIMEOUT(byte1, byte2, val) \
133 (byte1) = (((val) * 10) & 0xff), (byte2) = (((val) * 10) >> 8)
134 #define WDOG_GET_TIMEOUT(byte1, byte2) \
135 (((byte1) | ((byte2) << 8)) / 10)
136
137 #define IPMI_WDOG_RESET_TIMER 0x22
138 #define IPMI_WDOG_SET_TIMER 0x24
139 #define IPMI_WDOG_GET_TIMER 0x25
140
141 /* These are here until the real ones get into the watchdog.h interface. */
142 #ifndef WDIOC_GETTIMEOUT
143 #define WDIOC_GETTIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 20, int)
144 #endif
145 #ifndef WDIOC_SET_PRETIMEOUT
146 #define WDIOC_SET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 21, int)
147 #endif
148 #ifndef WDIOC_GET_PRETIMEOUT
149 #define WDIOC_GET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 22, int)
150 #endif
151
152 static DEFINE_MUTEX(ipmi_watchdog_mutex);
153 static int nowayout = WATCHDOG_NOWAYOUT;
154
155 static ipmi_user_t watchdog_user;
156 static int watchdog_ifnum;
157
158 /* Default the timeout to 10 seconds. */
159 static int timeout = 10;
160
161 /* The pre-timeout is disabled by default. */
162 static int pretimeout;
163
164 /* Default action is to reset the board on a timeout. */
165 static unsigned char action_val = WDOG_TIMEOUT_RESET;
166
167 static char action[16] = "reset";
168
169 static unsigned char preaction_val = WDOG_PRETIMEOUT_NONE;
170
171 static char preaction[16] = "pre_none";
172
173 static unsigned char preop_val = WDOG_PREOP_NONE;
174
175 static char preop[16] = "preop_none";
176 static DEFINE_SPINLOCK(ipmi_read_lock);
177 static char data_to_read;
178 static DECLARE_WAIT_QUEUE_HEAD(read_q);
179 static struct fasync_struct *fasync_q;
180 static char pretimeout_since_last_heartbeat;
181 static char expect_close;
182
183 static int ifnum_to_use = -1;
184
185 /* Parameters to ipmi_set_timeout */
186 #define IPMI_SET_TIMEOUT_NO_HB 0
187 #define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1
188 #define IPMI_SET_TIMEOUT_FORCE_HB 2
189
190 static int ipmi_set_timeout(int do_heartbeat);
191 static void ipmi_register_watchdog(int ipmi_intf);
192 static void ipmi_unregister_watchdog(int ipmi_intf);
193
194 /*
195 * If true, the driver will start running as soon as it is configured
196 * and ready.
197 */
198 static int start_now;
199
set_param_timeout(const char * val,const struct kernel_param * kp)200 static int set_param_timeout(const char *val, const struct kernel_param *kp)
201 {
202 char *endp;
203 int l;
204 int rv = 0;
205
206 if (!val)
207 return -EINVAL;
208 l = simple_strtoul(val, &endp, 0);
209 if (endp == val)
210 return -EINVAL;
211
212 *((int *)kp->arg) = l;
213 if (watchdog_user)
214 rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
215
216 return rv;
217 }
218
219 static struct kernel_param_ops param_ops_timeout = {
220 .set = set_param_timeout,
221 .get = param_get_int,
222 };
223 #define param_check_timeout param_check_int
224
225 typedef int (*action_fn)(const char *intval, char *outval);
226
227 static int action_op(const char *inval, char *outval);
228 static int preaction_op(const char *inval, char *outval);
229 static int preop_op(const char *inval, char *outval);
230 static void check_parms(void);
231
set_param_str(const char * val,const struct kernel_param * kp)232 static int set_param_str(const char *val, const struct kernel_param *kp)
233 {
234 action_fn fn = (action_fn) kp->arg;
235 int rv = 0;
236 char valcp[16];
237 char *s;
238
239 strncpy(valcp, val, 16);
240 valcp[15] = '\0';
241
242 s = strstrip(valcp);
243
244 rv = fn(s, NULL);
245 if (rv)
246 goto out;
247
248 check_parms();
249 if (watchdog_user)
250 rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
251
252 out:
253 return rv;
254 }
255
get_param_str(char * buffer,const struct kernel_param * kp)256 static int get_param_str(char *buffer, const struct kernel_param *kp)
257 {
258 action_fn fn = (action_fn) kp->arg;
259 int rv;
260
261 rv = fn(NULL, buffer);
262 if (rv)
263 return rv;
264 return strlen(buffer);
265 }
266
267
set_param_wdog_ifnum(const char * val,const struct kernel_param * kp)268 static int set_param_wdog_ifnum(const char *val, const struct kernel_param *kp)
269 {
270 int rv = param_set_int(val, kp);
271 if (rv)
272 return rv;
273 if ((ifnum_to_use < 0) || (ifnum_to_use == watchdog_ifnum))
274 return 0;
275
276 ipmi_unregister_watchdog(watchdog_ifnum);
277 ipmi_register_watchdog(ifnum_to_use);
278 return 0;
279 }
280
281 static struct kernel_param_ops param_ops_wdog_ifnum = {
282 .set = set_param_wdog_ifnum,
283 .get = param_get_int,
284 };
285
286 #define param_check_wdog_ifnum param_check_int
287
288 static struct kernel_param_ops param_ops_str = {
289 .set = set_param_str,
290 .get = get_param_str,
291 };
292
293 module_param(ifnum_to_use, wdog_ifnum, 0644);
294 MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog "
295 "timer. Setting to -1 defaults to the first registered "
296 "interface");
297
298 module_param(timeout, timeout, 0644);
299 MODULE_PARM_DESC(timeout, "Timeout value in seconds.");
300
301 module_param(pretimeout, timeout, 0644);
302 MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds.");
303
304 module_param_cb(action, ¶m_ops_str, action_op, 0644);
305 MODULE_PARM_DESC(action, "Timeout action. One of: "
306 "reset, none, power_cycle, power_off.");
307
308 module_param_cb(preaction, ¶m_ops_str, preaction_op, 0644);
309 MODULE_PARM_DESC(preaction, "Pretimeout action. One of: "
310 "pre_none, pre_smi, pre_nmi, pre_int.");
311
312 module_param_cb(preop, ¶m_ops_str, preop_op, 0644);
313 MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: "
314 "preop_none, preop_panic, preop_give_data.");
315
316 module_param(start_now, int, 0444);
317 MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as"
318 "soon as the driver is loaded.");
319
320 module_param(nowayout, int, 0644);
321 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
322 "(default=CONFIG_WATCHDOG_NOWAYOUT)");
323
324 /* Default state of the timer. */
325 static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
326
327 /* If shutting down via IPMI, we ignore the heartbeat. */
328 static int ipmi_ignore_heartbeat;
329
330 /* Is someone using the watchdog? Only one user is allowed. */
331 static unsigned long ipmi_wdog_open;
332
333 /*
334 * If set to 1, the heartbeat command will set the state to reset and
335 * start the timer. The timer doesn't normally run when the driver is
336 * first opened until the heartbeat is set the first time, this
337 * variable is used to accomplish this.
338 */
339 static int ipmi_start_timer_on_heartbeat;
340
341 /* IPMI version of the BMC. */
342 static unsigned char ipmi_version_major;
343 static unsigned char ipmi_version_minor;
344
345 /* If a pretimeout occurs, this is used to allow only one panic to happen. */
346 static atomic_t preop_panic_excl = ATOMIC_INIT(-1);
347
348 #ifdef HAVE_DIE_NMI
349 static int testing_nmi;
350 static int nmi_handler_registered;
351 #endif
352
353 static int ipmi_heartbeat(void);
354
355 /*
356 * We use a mutex to make sure that only one thing can send a set
357 * timeout at one time, because we only have one copy of the data.
358 * The mutex is claimed when the set_timeout is sent and freed
359 * when both messages are free.
360 */
361 static atomic_t set_timeout_tofree = ATOMIC_INIT(0);
362 static DEFINE_MUTEX(set_timeout_lock);
363 static DECLARE_COMPLETION(set_timeout_wait);
set_timeout_free_smi(struct ipmi_smi_msg * msg)364 static void set_timeout_free_smi(struct ipmi_smi_msg *msg)
365 {
366 if (atomic_dec_and_test(&set_timeout_tofree))
367 complete(&set_timeout_wait);
368 }
set_timeout_free_recv(struct ipmi_recv_msg * msg)369 static void set_timeout_free_recv(struct ipmi_recv_msg *msg)
370 {
371 if (atomic_dec_and_test(&set_timeout_tofree))
372 complete(&set_timeout_wait);
373 }
374 static struct ipmi_smi_msg set_timeout_smi_msg = {
375 .done = set_timeout_free_smi
376 };
377 static struct ipmi_recv_msg set_timeout_recv_msg = {
378 .done = set_timeout_free_recv
379 };
380
i_ipmi_set_timeout(struct ipmi_smi_msg * smi_msg,struct ipmi_recv_msg * recv_msg,int * send_heartbeat_now)381 static int i_ipmi_set_timeout(struct ipmi_smi_msg *smi_msg,
382 struct ipmi_recv_msg *recv_msg,
383 int *send_heartbeat_now)
384 {
385 struct kernel_ipmi_msg msg;
386 unsigned char data[6];
387 int rv;
388 struct ipmi_system_interface_addr addr;
389 int hbnow = 0;
390
391
392 /* These can be cleared as we are setting the timeout. */
393 pretimeout_since_last_heartbeat = 0;
394
395 data[0] = 0;
396 WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS);
397
398 if ((ipmi_version_major > 1)
399 || ((ipmi_version_major == 1) && (ipmi_version_minor >= 5))) {
400 /* This is an IPMI 1.5-only feature. */
401 data[0] |= WDOG_DONT_STOP_ON_SET;
402 } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
403 /*
404 * In ipmi 1.0, setting the timer stops the watchdog, we
405 * need to start it back up again.
406 */
407 hbnow = 1;
408 }
409
410 data[1] = 0;
411 WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state);
412 if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) {
413 WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val);
414 data[2] = pretimeout;
415 } else {
416 WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE);
417 data[2] = 0; /* No pretimeout. */
418 }
419 data[3] = 0;
420 WDOG_SET_TIMEOUT(data[4], data[5], timeout);
421
422 addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
423 addr.channel = IPMI_BMC_CHANNEL;
424 addr.lun = 0;
425
426 msg.netfn = 0x06;
427 msg.cmd = IPMI_WDOG_SET_TIMER;
428 msg.data = data;
429 msg.data_len = sizeof(data);
430 rv = ipmi_request_supply_msgs(watchdog_user,
431 (struct ipmi_addr *) &addr,
432 0,
433 &msg,
434 NULL,
435 smi_msg,
436 recv_msg,
437 1);
438 if (rv) {
439 printk(KERN_WARNING PFX "set timeout error: %d\n",
440 rv);
441 }
442
443 if (send_heartbeat_now)
444 *send_heartbeat_now = hbnow;
445
446 return rv;
447 }
448
ipmi_set_timeout(int do_heartbeat)449 static int ipmi_set_timeout(int do_heartbeat)
450 {
451 int send_heartbeat_now;
452 int rv;
453
454
455 /* We can only send one of these at a time. */
456 mutex_lock(&set_timeout_lock);
457
458 atomic_set(&set_timeout_tofree, 2);
459
460 rv = i_ipmi_set_timeout(&set_timeout_smi_msg,
461 &set_timeout_recv_msg,
462 &send_heartbeat_now);
463 if (rv) {
464 mutex_unlock(&set_timeout_lock);
465 goto out;
466 }
467
468 wait_for_completion(&set_timeout_wait);
469
470 mutex_unlock(&set_timeout_lock);
471
472 if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB)
473 || ((send_heartbeat_now)
474 && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY)))
475 rv = ipmi_heartbeat();
476
477 out:
478 return rv;
479 }
480
481 static atomic_t panic_done_count = ATOMIC_INIT(0);
482
panic_smi_free(struct ipmi_smi_msg * msg)483 static void panic_smi_free(struct ipmi_smi_msg *msg)
484 {
485 atomic_dec(&panic_done_count);
486 }
panic_recv_free(struct ipmi_recv_msg * msg)487 static void panic_recv_free(struct ipmi_recv_msg *msg)
488 {
489 atomic_dec(&panic_done_count);
490 }
491
492 static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = {
493 .done = panic_smi_free
494 };
495 static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = {
496 .done = panic_recv_free
497 };
498
panic_halt_ipmi_heartbeat(void)499 static void panic_halt_ipmi_heartbeat(void)
500 {
501 struct kernel_ipmi_msg msg;
502 struct ipmi_system_interface_addr addr;
503 int rv;
504
505 /*
506 * Don't reset the timer if we have the timer turned off, that
507 * re-enables the watchdog.
508 */
509 if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE)
510 return;
511
512 addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
513 addr.channel = IPMI_BMC_CHANNEL;
514 addr.lun = 0;
515
516 msg.netfn = 0x06;
517 msg.cmd = IPMI_WDOG_RESET_TIMER;
518 msg.data = NULL;
519 msg.data_len = 0;
520 rv = ipmi_request_supply_msgs(watchdog_user,
521 (struct ipmi_addr *) &addr,
522 0,
523 &msg,
524 NULL,
525 &panic_halt_heartbeat_smi_msg,
526 &panic_halt_heartbeat_recv_msg,
527 1);
528 if (!rv)
529 atomic_add(2, &panic_done_count);
530 }
531
532 static struct ipmi_smi_msg panic_halt_smi_msg = {
533 .done = panic_smi_free
534 };
535 static struct ipmi_recv_msg panic_halt_recv_msg = {
536 .done = panic_recv_free
537 };
538
539 /*
540 * Special call, doesn't claim any locks. This is only to be called
541 * at panic or halt time, in run-to-completion mode, when the caller
542 * is the only CPU and the only thing that will be going is these IPMI
543 * calls.
544 */
panic_halt_ipmi_set_timeout(void)545 static void panic_halt_ipmi_set_timeout(void)
546 {
547 int send_heartbeat_now;
548 int rv;
549
550 /* Wait for the messages to be free. */
551 while (atomic_read(&panic_done_count) != 0)
552 ipmi_poll_interface(watchdog_user);
553 rv = i_ipmi_set_timeout(&panic_halt_smi_msg,
554 &panic_halt_recv_msg,
555 &send_heartbeat_now);
556 if (!rv) {
557 atomic_add(2, &panic_done_count);
558 if (send_heartbeat_now)
559 panic_halt_ipmi_heartbeat();
560 } else
561 printk(KERN_WARNING PFX
562 "Unable to extend the watchdog timeout.");
563 while (atomic_read(&panic_done_count) != 0)
564 ipmi_poll_interface(watchdog_user);
565 }
566
567 /*
568 * We use a mutex to make sure that only one thing can send a
569 * heartbeat at one time, because we only have one copy of the data.
570 * The semaphore is claimed when the set_timeout is sent and freed
571 * when both messages are free.
572 */
573 static atomic_t heartbeat_tofree = ATOMIC_INIT(0);
574 static DEFINE_MUTEX(heartbeat_lock);
575 static DECLARE_COMPLETION(heartbeat_wait);
heartbeat_free_smi(struct ipmi_smi_msg * msg)576 static void heartbeat_free_smi(struct ipmi_smi_msg *msg)
577 {
578 if (atomic_dec_and_test(&heartbeat_tofree))
579 complete(&heartbeat_wait);
580 }
heartbeat_free_recv(struct ipmi_recv_msg * msg)581 static void heartbeat_free_recv(struct ipmi_recv_msg *msg)
582 {
583 if (atomic_dec_and_test(&heartbeat_tofree))
584 complete(&heartbeat_wait);
585 }
586 static struct ipmi_smi_msg heartbeat_smi_msg = {
587 .done = heartbeat_free_smi
588 };
589 static struct ipmi_recv_msg heartbeat_recv_msg = {
590 .done = heartbeat_free_recv
591 };
592
ipmi_heartbeat(void)593 static int ipmi_heartbeat(void)
594 {
595 struct kernel_ipmi_msg msg;
596 int rv;
597 struct ipmi_system_interface_addr addr;
598
599 if (ipmi_ignore_heartbeat)
600 return 0;
601
602 if (ipmi_start_timer_on_heartbeat) {
603 ipmi_start_timer_on_heartbeat = 0;
604 ipmi_watchdog_state = action_val;
605 return ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
606 } else if (pretimeout_since_last_heartbeat) {
607 /*
608 * A pretimeout occurred, make sure we set the timeout.
609 * We don't want to set the action, though, we want to
610 * leave that alone (thus it can't be combined with the
611 * above operation.
612 */
613 return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
614 }
615
616 mutex_lock(&heartbeat_lock);
617
618 atomic_set(&heartbeat_tofree, 2);
619
620 /*
621 * Don't reset the timer if we have the timer turned off, that
622 * re-enables the watchdog.
623 */
624 if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) {
625 mutex_unlock(&heartbeat_lock);
626 return 0;
627 }
628
629 addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
630 addr.channel = IPMI_BMC_CHANNEL;
631 addr.lun = 0;
632
633 msg.netfn = 0x06;
634 msg.cmd = IPMI_WDOG_RESET_TIMER;
635 msg.data = NULL;
636 msg.data_len = 0;
637 rv = ipmi_request_supply_msgs(watchdog_user,
638 (struct ipmi_addr *) &addr,
639 0,
640 &msg,
641 NULL,
642 &heartbeat_smi_msg,
643 &heartbeat_recv_msg,
644 1);
645 if (rv) {
646 mutex_unlock(&heartbeat_lock);
647 printk(KERN_WARNING PFX "heartbeat failure: %d\n",
648 rv);
649 return rv;
650 }
651
652 /* Wait for the heartbeat to be sent. */
653 wait_for_completion(&heartbeat_wait);
654
655 if (heartbeat_recv_msg.msg.data[0] != 0) {
656 /*
657 * Got an error in the heartbeat response. It was already
658 * reported in ipmi_wdog_msg_handler, but we should return
659 * an error here.
660 */
661 rv = -EINVAL;
662 }
663
664 mutex_unlock(&heartbeat_lock);
665
666 return rv;
667 }
668
669 static struct watchdog_info ident = {
670 .options = 0, /* WDIOF_SETTIMEOUT, */
671 .firmware_version = 1,
672 .identity = "IPMI"
673 };
674
ipmi_ioctl(struct file * file,unsigned int cmd,unsigned long arg)675 static int ipmi_ioctl(struct file *file,
676 unsigned int cmd, unsigned long arg)
677 {
678 void __user *argp = (void __user *)arg;
679 int i;
680 int val;
681
682 switch (cmd) {
683 case WDIOC_GETSUPPORT:
684 i = copy_to_user(argp, &ident, sizeof(ident));
685 return i ? -EFAULT : 0;
686
687 case WDIOC_SETTIMEOUT:
688 i = copy_from_user(&val, argp, sizeof(int));
689 if (i)
690 return -EFAULT;
691 timeout = val;
692 return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
693
694 case WDIOC_GETTIMEOUT:
695 i = copy_to_user(argp, &timeout, sizeof(timeout));
696 if (i)
697 return -EFAULT;
698 return 0;
699
700 case WDIOC_SET_PRETIMEOUT:
701 case WDIOC_SETPRETIMEOUT:
702 i = copy_from_user(&val, argp, sizeof(int));
703 if (i)
704 return -EFAULT;
705 pretimeout = val;
706 return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
707
708 case WDIOC_GET_PRETIMEOUT:
709 case WDIOC_GETPRETIMEOUT:
710 i = copy_to_user(argp, &pretimeout, sizeof(pretimeout));
711 if (i)
712 return -EFAULT;
713 return 0;
714
715 case WDIOC_KEEPALIVE:
716 return ipmi_heartbeat();
717
718 case WDIOC_SETOPTIONS:
719 i = copy_from_user(&val, argp, sizeof(int));
720 if (i)
721 return -EFAULT;
722 if (val & WDIOS_DISABLECARD) {
723 ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
724 ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
725 ipmi_start_timer_on_heartbeat = 0;
726 }
727
728 if (val & WDIOS_ENABLECARD) {
729 ipmi_watchdog_state = action_val;
730 ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
731 }
732 return 0;
733
734 case WDIOC_GETSTATUS:
735 val = 0;
736 i = copy_to_user(argp, &val, sizeof(val));
737 if (i)
738 return -EFAULT;
739 return 0;
740
741 default:
742 return -ENOIOCTLCMD;
743 }
744 }
745
ipmi_unlocked_ioctl(struct file * file,unsigned int cmd,unsigned long arg)746 static long ipmi_unlocked_ioctl(struct file *file,
747 unsigned int cmd,
748 unsigned long arg)
749 {
750 int ret;
751
752 mutex_lock(&ipmi_watchdog_mutex);
753 ret = ipmi_ioctl(file, cmd, arg);
754 mutex_unlock(&ipmi_watchdog_mutex);
755
756 return ret;
757 }
758
ipmi_write(struct file * file,const char __user * buf,size_t len,loff_t * ppos)759 static ssize_t ipmi_write(struct file *file,
760 const char __user *buf,
761 size_t len,
762 loff_t *ppos)
763 {
764 int rv;
765
766 if (len) {
767 if (!nowayout) {
768 size_t i;
769
770 /* In case it was set long ago */
771 expect_close = 0;
772
773 for (i = 0; i != len; i++) {
774 char c;
775
776 if (get_user(c, buf + i))
777 return -EFAULT;
778 if (c == 'V')
779 expect_close = 42;
780 }
781 }
782 rv = ipmi_heartbeat();
783 if (rv)
784 return rv;
785 }
786 return len;
787 }
788
ipmi_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)789 static ssize_t ipmi_read(struct file *file,
790 char __user *buf,
791 size_t count,
792 loff_t *ppos)
793 {
794 int rv = 0;
795 wait_queue_t wait;
796
797 if (count <= 0)
798 return 0;
799
800 /*
801 * Reading returns if the pretimeout has gone off, and it only does
802 * it once per pretimeout.
803 */
804 spin_lock(&ipmi_read_lock);
805 if (!data_to_read) {
806 if (file->f_flags & O_NONBLOCK) {
807 rv = -EAGAIN;
808 goto out;
809 }
810
811 init_waitqueue_entry(&wait, current);
812 add_wait_queue(&read_q, &wait);
813 while (!data_to_read) {
814 set_current_state(TASK_INTERRUPTIBLE);
815 spin_unlock(&ipmi_read_lock);
816 schedule();
817 spin_lock(&ipmi_read_lock);
818 }
819 remove_wait_queue(&read_q, &wait);
820
821 if (signal_pending(current)) {
822 rv = -ERESTARTSYS;
823 goto out;
824 }
825 }
826 data_to_read = 0;
827
828 out:
829 spin_unlock(&ipmi_read_lock);
830
831 if (rv == 0) {
832 if (copy_to_user(buf, &data_to_read, 1))
833 rv = -EFAULT;
834 else
835 rv = 1;
836 }
837
838 return rv;
839 }
840
ipmi_open(struct inode * ino,struct file * filep)841 static int ipmi_open(struct inode *ino, struct file *filep)
842 {
843 switch (iminor(ino)) {
844 case WATCHDOG_MINOR:
845 if (test_and_set_bit(0, &ipmi_wdog_open))
846 return -EBUSY;
847
848
849 /*
850 * Don't start the timer now, let it start on the
851 * first heartbeat.
852 */
853 ipmi_start_timer_on_heartbeat = 1;
854 return nonseekable_open(ino, filep);
855
856 default:
857 return (-ENODEV);
858 }
859 }
860
ipmi_poll(struct file * file,poll_table * wait)861 static unsigned int ipmi_poll(struct file *file, poll_table *wait)
862 {
863 unsigned int mask = 0;
864
865 poll_wait(file, &read_q, wait);
866
867 spin_lock(&ipmi_read_lock);
868 if (data_to_read)
869 mask |= (POLLIN | POLLRDNORM);
870 spin_unlock(&ipmi_read_lock);
871
872 return mask;
873 }
874
ipmi_fasync(int fd,struct file * file,int on)875 static int ipmi_fasync(int fd, struct file *file, int on)
876 {
877 int result;
878
879 result = fasync_helper(fd, file, on, &fasync_q);
880
881 return (result);
882 }
883
ipmi_close(struct inode * ino,struct file * filep)884 static int ipmi_close(struct inode *ino, struct file *filep)
885 {
886 if (iminor(ino) == WATCHDOG_MINOR) {
887 if (expect_close == 42) {
888 ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
889 ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
890 } else {
891 printk(KERN_CRIT PFX
892 "Unexpected close, not stopping watchdog!\n");
893 ipmi_heartbeat();
894 }
895 clear_bit(0, &ipmi_wdog_open);
896 }
897
898 expect_close = 0;
899
900 return 0;
901 }
902
903 static const struct file_operations ipmi_wdog_fops = {
904 .owner = THIS_MODULE,
905 .read = ipmi_read,
906 .poll = ipmi_poll,
907 .write = ipmi_write,
908 .unlocked_ioctl = ipmi_unlocked_ioctl,
909 .open = ipmi_open,
910 .release = ipmi_close,
911 .fasync = ipmi_fasync,
912 .llseek = no_llseek,
913 };
914
915 static struct miscdevice ipmi_wdog_miscdev = {
916 .minor = WATCHDOG_MINOR,
917 .name = "watchdog",
918 .fops = &ipmi_wdog_fops
919 };
920
ipmi_wdog_msg_handler(struct ipmi_recv_msg * msg,void * handler_data)921 static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg,
922 void *handler_data)
923 {
924 if (msg->msg.data[0] != 0) {
925 printk(KERN_ERR PFX "response: Error %x on cmd %x\n",
926 msg->msg.data[0],
927 msg->msg.cmd);
928 }
929
930 ipmi_free_recv_msg(msg);
931 }
932
ipmi_wdog_pretimeout_handler(void * handler_data)933 static void ipmi_wdog_pretimeout_handler(void *handler_data)
934 {
935 if (preaction_val != WDOG_PRETIMEOUT_NONE) {
936 if (preop_val == WDOG_PREOP_PANIC) {
937 if (atomic_inc_and_test(&preop_panic_excl))
938 panic("Watchdog pre-timeout");
939 } else if (preop_val == WDOG_PREOP_GIVE_DATA) {
940 spin_lock(&ipmi_read_lock);
941 data_to_read = 1;
942 wake_up_interruptible(&read_q);
943 kill_fasync(&fasync_q, SIGIO, POLL_IN);
944
945 spin_unlock(&ipmi_read_lock);
946 }
947 }
948
949 /*
950 * On some machines, the heartbeat will give an error and not
951 * work unless we re-enable the timer. So do so.
952 */
953 pretimeout_since_last_heartbeat = 1;
954 }
955
956 static struct ipmi_user_hndl ipmi_hndlrs = {
957 .ipmi_recv_hndl = ipmi_wdog_msg_handler,
958 .ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_handler
959 };
960
ipmi_register_watchdog(int ipmi_intf)961 static void ipmi_register_watchdog(int ipmi_intf)
962 {
963 int rv = -EBUSY;
964
965 if (watchdog_user)
966 goto out;
967
968 if ((ifnum_to_use >= 0) && (ifnum_to_use != ipmi_intf))
969 goto out;
970
971 watchdog_ifnum = ipmi_intf;
972
973 rv = ipmi_create_user(ipmi_intf, &ipmi_hndlrs, NULL, &watchdog_user);
974 if (rv < 0) {
975 printk(KERN_CRIT PFX "Unable to register with ipmi\n");
976 goto out;
977 }
978
979 ipmi_get_version(watchdog_user,
980 &ipmi_version_major,
981 &ipmi_version_minor);
982
983 rv = misc_register(&ipmi_wdog_miscdev);
984 if (rv < 0) {
985 ipmi_destroy_user(watchdog_user);
986 watchdog_user = NULL;
987 printk(KERN_CRIT PFX "Unable to register misc device\n");
988 }
989
990 #ifdef HAVE_DIE_NMI
991 if (nmi_handler_registered) {
992 int old_pretimeout = pretimeout;
993 int old_timeout = timeout;
994 int old_preop_val = preop_val;
995
996 /*
997 * Set the pretimeout to go off in a second and give
998 * ourselves plenty of time to stop the timer.
999 */
1000 ipmi_watchdog_state = WDOG_TIMEOUT_RESET;
1001 preop_val = WDOG_PREOP_NONE; /* Make sure nothing happens */
1002 pretimeout = 99;
1003 timeout = 100;
1004
1005 testing_nmi = 1;
1006
1007 rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
1008 if (rv) {
1009 printk(KERN_WARNING PFX "Error starting timer to"
1010 " test NMI: 0x%x. The NMI pretimeout will"
1011 " likely not work\n", rv);
1012 rv = 0;
1013 goto out_restore;
1014 }
1015
1016 msleep(1500);
1017
1018 if (testing_nmi != 2) {
1019 printk(KERN_WARNING PFX "IPMI NMI didn't seem to"
1020 " occur. The NMI pretimeout will"
1021 " likely not work\n");
1022 }
1023 out_restore:
1024 testing_nmi = 0;
1025 preop_val = old_preop_val;
1026 pretimeout = old_pretimeout;
1027 timeout = old_timeout;
1028 }
1029 #endif
1030
1031 out:
1032 if ((start_now) && (rv == 0)) {
1033 /* Run from startup, so start the timer now. */
1034 start_now = 0; /* Disable this function after first startup. */
1035 ipmi_watchdog_state = action_val;
1036 ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
1037 printk(KERN_INFO PFX "Starting now!\n");
1038 } else {
1039 /* Stop the timer now. */
1040 ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
1041 ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
1042 }
1043 }
1044
ipmi_unregister_watchdog(int ipmi_intf)1045 static void ipmi_unregister_watchdog(int ipmi_intf)
1046 {
1047 int rv;
1048
1049 if (!watchdog_user)
1050 goto out;
1051
1052 if (watchdog_ifnum != ipmi_intf)
1053 goto out;
1054
1055 /* Make sure no one can call us any more. */
1056 misc_deregister(&ipmi_wdog_miscdev);
1057
1058 /*
1059 * Wait to make sure the message makes it out. The lower layer has
1060 * pointers to our buffers, we want to make sure they are done before
1061 * we release our memory.
1062 */
1063 while (atomic_read(&set_timeout_tofree))
1064 schedule_timeout_uninterruptible(1);
1065
1066 /* Disconnect from IPMI. */
1067 rv = ipmi_destroy_user(watchdog_user);
1068 if (rv) {
1069 printk(KERN_WARNING PFX "error unlinking from IPMI: %d\n",
1070 rv);
1071 }
1072 watchdog_user = NULL;
1073
1074 out:
1075 return;
1076 }
1077
1078 #ifdef HAVE_DIE_NMI
1079 static int
ipmi_nmi(struct notifier_block * self,unsigned long val,void * data)1080 ipmi_nmi(struct notifier_block *self, unsigned long val, void *data)
1081 {
1082 struct die_args *args = data;
1083
1084 if (val != DIE_NMIUNKNOWN)
1085 return NOTIFY_OK;
1086
1087 /* Hack, if it's a memory or I/O error, ignore it. */
1088 if (args->err & 0xc0)
1089 return NOTIFY_OK;
1090
1091 /*
1092 * If we get here, it's an NMI that's not a memory or I/O
1093 * error. We can't truly tell if it's from IPMI or not
1094 * without sending a message, and sending a message is almost
1095 * impossible because of locking.
1096 */
1097
1098 if (testing_nmi) {
1099 testing_nmi = 2;
1100 return NOTIFY_STOP;
1101 }
1102
1103 /* If we are not expecting a timeout, ignore it. */
1104 if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE)
1105 return NOTIFY_OK;
1106
1107 if (preaction_val != WDOG_PRETIMEOUT_NMI)
1108 return NOTIFY_OK;
1109
1110 /*
1111 * If no one else handled the NMI, we assume it was the IPMI
1112 * watchdog.
1113 */
1114 if (preop_val == WDOG_PREOP_PANIC) {
1115 /* On some machines, the heartbeat will give
1116 an error and not work unless we re-enable
1117 the timer. So do so. */
1118 pretimeout_since_last_heartbeat = 1;
1119 if (atomic_inc_and_test(&preop_panic_excl))
1120 panic(PFX "pre-timeout");
1121 }
1122
1123 return NOTIFY_STOP;
1124 }
1125
1126 static struct notifier_block ipmi_nmi_handler = {
1127 .notifier_call = ipmi_nmi
1128 };
1129 #endif
1130
wdog_reboot_handler(struct notifier_block * this,unsigned long code,void * unused)1131 static int wdog_reboot_handler(struct notifier_block *this,
1132 unsigned long code,
1133 void *unused)
1134 {
1135 static int reboot_event_handled;
1136
1137 if ((watchdog_user) && (!reboot_event_handled)) {
1138 /* Make sure we only do this once. */
1139 reboot_event_handled = 1;
1140
1141 if (code == SYS_POWER_OFF || code == SYS_HALT) {
1142 /* Disable the WDT if we are shutting down. */
1143 ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
1144 panic_halt_ipmi_set_timeout();
1145 } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
1146 /* Set a long timer to let the reboot happens, but
1147 reboot if it hangs, but only if the watchdog
1148 timer was already running. */
1149 timeout = 120;
1150 pretimeout = 0;
1151 ipmi_watchdog_state = WDOG_TIMEOUT_RESET;
1152 panic_halt_ipmi_set_timeout();
1153 }
1154 }
1155 return NOTIFY_OK;
1156 }
1157
1158 static struct notifier_block wdog_reboot_notifier = {
1159 .notifier_call = wdog_reboot_handler,
1160 .next = NULL,
1161 .priority = 0
1162 };
1163
wdog_panic_handler(struct notifier_block * this,unsigned long event,void * unused)1164 static int wdog_panic_handler(struct notifier_block *this,
1165 unsigned long event,
1166 void *unused)
1167 {
1168 static int panic_event_handled;
1169
1170 /* On a panic, if we have a panic timeout, make sure to extend
1171 the watchdog timer to a reasonable value to complete the
1172 panic, if the watchdog timer is running. Plus the
1173 pretimeout is meaningless at panic time. */
1174 if (watchdog_user && !panic_event_handled &&
1175 ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
1176 /* Make sure we do this only once. */
1177 panic_event_handled = 1;
1178
1179 timeout = 255;
1180 pretimeout = 0;
1181 panic_halt_ipmi_set_timeout();
1182 }
1183
1184 return NOTIFY_OK;
1185 }
1186
1187 static struct notifier_block wdog_panic_notifier = {
1188 .notifier_call = wdog_panic_handler,
1189 .next = NULL,
1190 .priority = 150 /* priority: INT_MAX >= x >= 0 */
1191 };
1192
1193
ipmi_new_smi(int if_num,struct device * device)1194 static void ipmi_new_smi(int if_num, struct device *device)
1195 {
1196 ipmi_register_watchdog(if_num);
1197 }
1198
ipmi_smi_gone(int if_num)1199 static void ipmi_smi_gone(int if_num)
1200 {
1201 ipmi_unregister_watchdog(if_num);
1202 }
1203
1204 static struct ipmi_smi_watcher smi_watcher = {
1205 .owner = THIS_MODULE,
1206 .new_smi = ipmi_new_smi,
1207 .smi_gone = ipmi_smi_gone
1208 };
1209
action_op(const char * inval,char * outval)1210 static int action_op(const char *inval, char *outval)
1211 {
1212 if (outval)
1213 strcpy(outval, action);
1214
1215 if (!inval)
1216 return 0;
1217
1218 if (strcmp(inval, "reset") == 0)
1219 action_val = WDOG_TIMEOUT_RESET;
1220 else if (strcmp(inval, "none") == 0)
1221 action_val = WDOG_TIMEOUT_NONE;
1222 else if (strcmp(inval, "power_cycle") == 0)
1223 action_val = WDOG_TIMEOUT_POWER_CYCLE;
1224 else if (strcmp(inval, "power_off") == 0)
1225 action_val = WDOG_TIMEOUT_POWER_DOWN;
1226 else
1227 return -EINVAL;
1228 strcpy(action, inval);
1229 return 0;
1230 }
1231
preaction_op(const char * inval,char * outval)1232 static int preaction_op(const char *inval, char *outval)
1233 {
1234 if (outval)
1235 strcpy(outval, preaction);
1236
1237 if (!inval)
1238 return 0;
1239
1240 if (strcmp(inval, "pre_none") == 0)
1241 preaction_val = WDOG_PRETIMEOUT_NONE;
1242 else if (strcmp(inval, "pre_smi") == 0)
1243 preaction_val = WDOG_PRETIMEOUT_SMI;
1244 #ifdef HAVE_DIE_NMI
1245 else if (strcmp(inval, "pre_nmi") == 0)
1246 preaction_val = WDOG_PRETIMEOUT_NMI;
1247 #endif
1248 else if (strcmp(inval, "pre_int") == 0)
1249 preaction_val = WDOG_PRETIMEOUT_MSG_INT;
1250 else
1251 return -EINVAL;
1252 strcpy(preaction, inval);
1253 return 0;
1254 }
1255
preop_op(const char * inval,char * outval)1256 static int preop_op(const char *inval, char *outval)
1257 {
1258 if (outval)
1259 strcpy(outval, preop);
1260
1261 if (!inval)
1262 return 0;
1263
1264 if (strcmp(inval, "preop_none") == 0)
1265 preop_val = WDOG_PREOP_NONE;
1266 else if (strcmp(inval, "preop_panic") == 0)
1267 preop_val = WDOG_PREOP_PANIC;
1268 else if (strcmp(inval, "preop_give_data") == 0)
1269 preop_val = WDOG_PREOP_GIVE_DATA;
1270 else
1271 return -EINVAL;
1272 strcpy(preop, inval);
1273 return 0;
1274 }
1275
check_parms(void)1276 static void check_parms(void)
1277 {
1278 #ifdef HAVE_DIE_NMI
1279 int do_nmi = 0;
1280 int rv;
1281
1282 if (preaction_val == WDOG_PRETIMEOUT_NMI) {
1283 do_nmi = 1;
1284 if (preop_val == WDOG_PREOP_GIVE_DATA) {
1285 printk(KERN_WARNING PFX "Pretimeout op is to give data"
1286 " but NMI pretimeout is enabled, setting"
1287 " pretimeout op to none\n");
1288 preop_op("preop_none", NULL);
1289 do_nmi = 0;
1290 }
1291 }
1292 if (do_nmi && !nmi_handler_registered) {
1293 rv = register_die_notifier(&ipmi_nmi_handler);
1294 if (rv) {
1295 printk(KERN_WARNING PFX
1296 "Can't register nmi handler\n");
1297 return;
1298 } else
1299 nmi_handler_registered = 1;
1300 } else if (!do_nmi && nmi_handler_registered) {
1301 unregister_die_notifier(&ipmi_nmi_handler);
1302 nmi_handler_registered = 0;
1303 }
1304 #endif
1305 }
1306
ipmi_wdog_init(void)1307 static int __init ipmi_wdog_init(void)
1308 {
1309 int rv;
1310
1311 if (action_op(action, NULL)) {
1312 action_op("reset", NULL);
1313 printk(KERN_INFO PFX "Unknown action '%s', defaulting to"
1314 " reset\n", action);
1315 }
1316
1317 if (preaction_op(preaction, NULL)) {
1318 preaction_op("pre_none", NULL);
1319 printk(KERN_INFO PFX "Unknown preaction '%s', defaulting to"
1320 " none\n", preaction);
1321 }
1322
1323 if (preop_op(preop, NULL)) {
1324 preop_op("preop_none", NULL);
1325 printk(KERN_INFO PFX "Unknown preop '%s', defaulting to"
1326 " none\n", preop);
1327 }
1328
1329 check_parms();
1330
1331 register_reboot_notifier(&wdog_reboot_notifier);
1332 atomic_notifier_chain_register(&panic_notifier_list,
1333 &wdog_panic_notifier);
1334
1335 rv = ipmi_smi_watcher_register(&smi_watcher);
1336 if (rv) {
1337 #ifdef HAVE_DIE_NMI
1338 if (nmi_handler_registered)
1339 unregister_die_notifier(&ipmi_nmi_handler);
1340 #endif
1341 atomic_notifier_chain_unregister(&panic_notifier_list,
1342 &wdog_panic_notifier);
1343 unregister_reboot_notifier(&wdog_reboot_notifier);
1344 printk(KERN_WARNING PFX "can't register smi watcher\n");
1345 return rv;
1346 }
1347
1348 printk(KERN_INFO PFX "driver initialized\n");
1349
1350 return 0;
1351 }
1352
ipmi_wdog_exit(void)1353 static void __exit ipmi_wdog_exit(void)
1354 {
1355 ipmi_smi_watcher_unregister(&smi_watcher);
1356 ipmi_unregister_watchdog(watchdog_ifnum);
1357
1358 #ifdef HAVE_DIE_NMI
1359 if (nmi_handler_registered)
1360 unregister_die_notifier(&ipmi_nmi_handler);
1361 #endif
1362
1363 atomic_notifier_chain_unregister(&panic_notifier_list,
1364 &wdog_panic_notifier);
1365 unregister_reboot_notifier(&wdog_reboot_notifier);
1366 }
1367 module_exit(ipmi_wdog_exit);
1368 module_init(ipmi_wdog_init);
1369 MODULE_LICENSE("GPL");
1370 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
1371 MODULE_DESCRIPTION("watchdog timer based upon the IPMI interface.");
1372