Commit | Line | Data |
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1da177e4 LT |
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/config.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/moduleparam.h> | |
37 | #include <linux/ipmi.h> | |
38 | #include <linux/ipmi_smi.h> | |
39 | #include <linux/watchdog.h> | |
40 | #include <linux/miscdevice.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/rwsem.h> | |
43 | #include <linux/errno.h> | |
44 | #include <asm/uaccess.h> | |
45 | #include <linux/notifier.h> | |
46 | #include <linux/nmi.h> | |
47 | #include <linux/reboot.h> | |
48 | #include <linux/wait.h> | |
49 | #include <linux/poll.h> | |
cc4673ee CM |
50 | #include <linux/string.h> |
51 | #include <linux/ctype.h> | |
b385676b | 52 | #include <asm/atomic.h> |
1da177e4 LT |
53 | #ifdef CONFIG_X86_LOCAL_APIC |
54 | #include <asm/apic.h> | |
55 | #endif | |
56 | ||
57 | #define PFX "IPMI Watchdog: " | |
58 | ||
1da177e4 LT |
59 | /* |
60 | * The IPMI command/response information for the watchdog timer. | |
61 | */ | |
62 | ||
63 | /* values for byte 1 of the set command, byte 2 of the get response. */ | |
64 | #define WDOG_DONT_LOG (1 << 7) | |
65 | #define WDOG_DONT_STOP_ON_SET (1 << 6) | |
66 | #define WDOG_SET_TIMER_USE(byte, use) \ | |
67 | byte = ((byte) & 0xf8) | ((use) & 0x7) | |
68 | #define WDOG_GET_TIMER_USE(byte) ((byte) & 0x7) | |
69 | #define WDOG_TIMER_USE_BIOS_FRB2 1 | |
70 | #define WDOG_TIMER_USE_BIOS_POST 2 | |
71 | #define WDOG_TIMER_USE_OS_LOAD 3 | |
72 | #define WDOG_TIMER_USE_SMS_OS 4 | |
73 | #define WDOG_TIMER_USE_OEM 5 | |
74 | ||
75 | /* values for byte 2 of the set command, byte 3 of the get response. */ | |
76 | #define WDOG_SET_PRETIMEOUT_ACT(byte, use) \ | |
77 | byte = ((byte) & 0x8f) | (((use) & 0x7) << 4) | |
78 | #define WDOG_GET_PRETIMEOUT_ACT(byte) (((byte) >> 4) & 0x7) | |
79 | #define WDOG_PRETIMEOUT_NONE 0 | |
80 | #define WDOG_PRETIMEOUT_SMI 1 | |
81 | #define WDOG_PRETIMEOUT_NMI 2 | |
82 | #define WDOG_PRETIMEOUT_MSG_INT 3 | |
83 | ||
84 | /* Operations that can be performed on a pretimout. */ | |
85 | #define WDOG_PREOP_NONE 0 | |
86 | #define WDOG_PREOP_PANIC 1 | |
87 | #define WDOG_PREOP_GIVE_DATA 2 /* Cause data to be available to | |
88 | read. Doesn't work in NMI | |
89 | mode. */ | |
90 | ||
91 | /* Actions to perform on a full timeout. */ | |
92 | #define WDOG_SET_TIMEOUT_ACT(byte, use) \ | |
93 | byte = ((byte) & 0xf8) | ((use) & 0x7) | |
94 | #define WDOG_GET_TIMEOUT_ACT(byte) ((byte) & 0x7) | |
95 | #define WDOG_TIMEOUT_NONE 0 | |
96 | #define WDOG_TIMEOUT_RESET 1 | |
97 | #define WDOG_TIMEOUT_POWER_DOWN 2 | |
98 | #define WDOG_TIMEOUT_POWER_CYCLE 3 | |
99 | ||
100 | /* Byte 3 of the get command, byte 4 of the get response is the | |
101 | pre-timeout in seconds. */ | |
102 | ||
103 | /* Bits for setting byte 4 of the set command, byte 5 of the get response. */ | |
104 | #define WDOG_EXPIRE_CLEAR_BIOS_FRB2 (1 << 1) | |
105 | #define WDOG_EXPIRE_CLEAR_BIOS_POST (1 << 2) | |
106 | #define WDOG_EXPIRE_CLEAR_OS_LOAD (1 << 3) | |
107 | #define WDOG_EXPIRE_CLEAR_SMS_OS (1 << 4) | |
108 | #define WDOG_EXPIRE_CLEAR_OEM (1 << 5) | |
109 | ||
110 | /* Setting/getting the watchdog timer value. This is for bytes 5 and | |
111 | 6 (the timeout time) of the set command, and bytes 6 and 7 (the | |
112 | timeout time) and 8 and 9 (the current countdown value) of the | |
113 | response. The timeout value is given in seconds (in the command it | |
114 | is 100ms intervals). */ | |
115 | #define WDOG_SET_TIMEOUT(byte1, byte2, val) \ | |
116 | (byte1) = (((val) * 10) & 0xff), (byte2) = (((val) * 10) >> 8) | |
117 | #define WDOG_GET_TIMEOUT(byte1, byte2) \ | |
118 | (((byte1) | ((byte2) << 8)) / 10) | |
119 | ||
120 | #define IPMI_WDOG_RESET_TIMER 0x22 | |
121 | #define IPMI_WDOG_SET_TIMER 0x24 | |
122 | #define IPMI_WDOG_GET_TIMER 0x25 | |
123 | ||
124 | /* These are here until the real ones get into the watchdog.h interface. */ | |
125 | #ifndef WDIOC_GETTIMEOUT | |
126 | #define WDIOC_GETTIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 20, int) | |
127 | #endif | |
128 | #ifndef WDIOC_SET_PRETIMEOUT | |
129 | #define WDIOC_SET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 21, int) | |
130 | #endif | |
131 | #ifndef WDIOC_GET_PRETIMEOUT | |
132 | #define WDIOC_GET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 22, int) | |
133 | #endif | |
134 | ||
4bfdf378 | 135 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 LT |
136 | |
137 | static ipmi_user_t watchdog_user = NULL; | |
138 | ||
139 | /* Default the timeout to 10 seconds. */ | |
140 | static int timeout = 10; | |
141 | ||
142 | /* The pre-timeout is disabled by default. */ | |
143 | static int pretimeout = 0; | |
144 | ||
145 | /* Default action is to reset the board on a timeout. */ | |
146 | static unsigned char action_val = WDOG_TIMEOUT_RESET; | |
147 | ||
148 | static char action[16] = "reset"; | |
149 | ||
150 | static unsigned char preaction_val = WDOG_PRETIMEOUT_NONE; | |
151 | ||
152 | static char preaction[16] = "pre_none"; | |
153 | ||
154 | static unsigned char preop_val = WDOG_PREOP_NONE; | |
155 | ||
156 | static char preop[16] = "preop_none"; | |
157 | static DEFINE_SPINLOCK(ipmi_read_lock); | |
158 | static char data_to_read = 0; | |
159 | static DECLARE_WAIT_QUEUE_HEAD(read_q); | |
160 | static struct fasync_struct *fasync_q = NULL; | |
161 | static char pretimeout_since_last_heartbeat = 0; | |
162 | static char expect_close; | |
163 | ||
cc4673ee CM |
164 | static DECLARE_RWSEM(register_sem); |
165 | ||
166 | /* Parameters to ipmi_set_timeout */ | |
167 | #define IPMI_SET_TIMEOUT_NO_HB 0 | |
168 | #define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1 | |
169 | #define IPMI_SET_TIMEOUT_FORCE_HB 2 | |
170 | ||
171 | static int ipmi_set_timeout(int do_heartbeat); | |
172 | ||
1da177e4 LT |
173 | /* If true, the driver will start running as soon as it is configured |
174 | and ready. */ | |
175 | static int start_now = 0; | |
176 | ||
cc4673ee CM |
177 | static int set_param_int(const char *val, struct kernel_param *kp) |
178 | { | |
179 | char *endp; | |
180 | int l; | |
181 | int rv = 0; | |
182 | ||
183 | if (!val) | |
184 | return -EINVAL; | |
185 | l = simple_strtoul(val, &endp, 0); | |
186 | if (endp == val) | |
187 | return -EINVAL; | |
188 | ||
189 | down_read(®ister_sem); | |
190 | *((int *)kp->arg) = l; | |
191 | if (watchdog_user) | |
192 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
193 | up_read(®ister_sem); | |
194 | ||
195 | return rv; | |
196 | } | |
197 | ||
198 | static int get_param_int(char *buffer, struct kernel_param *kp) | |
199 | { | |
200 | return sprintf(buffer, "%i", *((int *)kp->arg)); | |
201 | } | |
202 | ||
203 | typedef int (*action_fn)(const char *intval, char *outval); | |
204 | ||
205 | static int action_op(const char *inval, char *outval); | |
206 | static int preaction_op(const char *inval, char *outval); | |
207 | static int preop_op(const char *inval, char *outval); | |
208 | static void check_parms(void); | |
209 | ||
210 | static int set_param_str(const char *val, struct kernel_param *kp) | |
211 | { | |
212 | action_fn fn = (action_fn) kp->arg; | |
213 | int rv = 0; | |
214 | const char *end; | |
215 | char valcp[16]; | |
216 | int len; | |
217 | ||
218 | /* Truncate leading and trailing spaces. */ | |
219 | while (isspace(*val)) | |
220 | val++; | |
221 | end = val + strlen(val) - 1; | |
222 | while ((end >= val) && isspace(*end)) | |
223 | end--; | |
224 | len = end - val + 1; | |
225 | if (len > sizeof(valcp) - 1) | |
226 | return -EINVAL; | |
227 | memcpy(valcp, val, len); | |
228 | valcp[len] = '\0'; | |
229 | ||
230 | down_read(®ister_sem); | |
231 | rv = fn(valcp, NULL); | |
232 | if (rv) | |
233 | goto out_unlock; | |
234 | ||
235 | check_parms(); | |
236 | if (watchdog_user) | |
237 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
238 | ||
239 | out_unlock: | |
240 | up_read(®ister_sem); | |
241 | return rv; | |
242 | } | |
243 | ||
244 | static int get_param_str(char *buffer, struct kernel_param *kp) | |
245 | { | |
246 | action_fn fn = (action_fn) kp->arg; | |
247 | int rv; | |
248 | ||
249 | rv = fn(NULL, buffer); | |
250 | if (rv) | |
251 | return rv; | |
252 | return strlen(buffer); | |
253 | } | |
254 | ||
255 | module_param_call(timeout, set_param_int, get_param_int, &timeout, 0644); | |
1da177e4 | 256 | MODULE_PARM_DESC(timeout, "Timeout value in seconds."); |
cc4673ee CM |
257 | |
258 | module_param_call(pretimeout, set_param_int, get_param_int, &pretimeout, 0644); | |
1da177e4 | 259 | MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds."); |
cc4673ee CM |
260 | |
261 | module_param_call(action, set_param_str, get_param_str, action_op, 0644); | |
1da177e4 LT |
262 | MODULE_PARM_DESC(action, "Timeout action. One of: " |
263 | "reset, none, power_cycle, power_off."); | |
cc4673ee CM |
264 | |
265 | module_param_call(preaction, set_param_str, get_param_str, preaction_op, 0644); | |
1da177e4 LT |
266 | MODULE_PARM_DESC(preaction, "Pretimeout action. One of: " |
267 | "pre_none, pre_smi, pre_nmi, pre_int."); | |
cc4673ee CM |
268 | |
269 | module_param_call(preop, set_param_str, get_param_str, preop_op, 0644); | |
1da177e4 LT |
270 | MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: " |
271 | "preop_none, preop_panic, preop_give_data."); | |
cc4673ee | 272 | |
1da177e4 LT |
273 | module_param(start_now, int, 0); |
274 | MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as" | |
275 | "soon as the driver is loaded."); | |
cc4673ee CM |
276 | |
277 | module_param(nowayout, int, 0644); | |
1da177e4 LT |
278 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); |
279 | ||
280 | /* Default state of the timer. */ | |
281 | static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
282 | ||
283 | /* If shutting down via IPMI, we ignore the heartbeat. */ | |
284 | static int ipmi_ignore_heartbeat = 0; | |
285 | ||
286 | /* Is someone using the watchdog? Only one user is allowed. */ | |
287 | static unsigned long ipmi_wdog_open = 0; | |
288 | ||
289 | /* If set to 1, the heartbeat command will set the state to reset and | |
290 | start the timer. The timer doesn't normally run when the driver is | |
291 | first opened until the heartbeat is set the first time, this | |
292 | variable is used to accomplish this. */ | |
293 | static int ipmi_start_timer_on_heartbeat = 0; | |
294 | ||
295 | /* IPMI version of the BMC. */ | |
296 | static unsigned char ipmi_version_major; | |
297 | static unsigned char ipmi_version_minor; | |
298 | ||
b385676b CM |
299 | /* If a pretimeout occurs, this is used to allow only one panic to happen. */ |
300 | static atomic_t preop_panic_excl = ATOMIC_INIT(-1); | |
1da177e4 LT |
301 | |
302 | static int ipmi_heartbeat(void); | |
303 | static void panic_halt_ipmi_heartbeat(void); | |
304 | ||
305 | ||
306 | /* We use a semaphore to make sure that only one thing can send a set | |
307 | timeout at one time, because we only have one copy of the data. | |
308 | The semaphore is claimed when the set_timeout is sent and freed | |
309 | when both messages are free. */ | |
310 | static atomic_t set_timeout_tofree = ATOMIC_INIT(0); | |
311 | static DECLARE_MUTEX(set_timeout_lock); | |
312 | static void set_timeout_free_smi(struct ipmi_smi_msg *msg) | |
313 | { | |
314 | if (atomic_dec_and_test(&set_timeout_tofree)) | |
315 | up(&set_timeout_lock); | |
316 | } | |
317 | static void set_timeout_free_recv(struct ipmi_recv_msg *msg) | |
318 | { | |
319 | if (atomic_dec_and_test(&set_timeout_tofree)) | |
320 | up(&set_timeout_lock); | |
321 | } | |
322 | static struct ipmi_smi_msg set_timeout_smi_msg = | |
323 | { | |
324 | .done = set_timeout_free_smi | |
325 | }; | |
326 | static struct ipmi_recv_msg set_timeout_recv_msg = | |
327 | { | |
328 | .done = set_timeout_free_recv | |
329 | }; | |
330 | ||
331 | static int i_ipmi_set_timeout(struct ipmi_smi_msg *smi_msg, | |
332 | struct ipmi_recv_msg *recv_msg, | |
333 | int *send_heartbeat_now) | |
334 | { | |
335 | struct kernel_ipmi_msg msg; | |
336 | unsigned char data[6]; | |
337 | int rv; | |
338 | struct ipmi_system_interface_addr addr; | |
339 | int hbnow = 0; | |
340 | ||
341 | ||
342 | data[0] = 0; | |
343 | WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS); | |
344 | ||
345 | if ((ipmi_version_major > 1) | |
346 | || ((ipmi_version_major == 1) && (ipmi_version_minor >= 5))) | |
347 | { | |
348 | /* This is an IPMI 1.5-only feature. */ | |
349 | data[0] |= WDOG_DONT_STOP_ON_SET; | |
350 | } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { | |
351 | /* In ipmi 1.0, setting the timer stops the watchdog, we | |
352 | need to start it back up again. */ | |
353 | hbnow = 1; | |
354 | } | |
355 | ||
356 | data[1] = 0; | |
357 | WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state); | |
8f05ee9a | 358 | if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) { |
1da177e4 LT |
359 | WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val); |
360 | data[2] = pretimeout; | |
361 | } else { | |
362 | WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE); | |
363 | data[2] = 0; /* No pretimeout. */ | |
364 | } | |
365 | data[3] = 0; | |
366 | WDOG_SET_TIMEOUT(data[4], data[5], timeout); | |
367 | ||
368 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
369 | addr.channel = IPMI_BMC_CHANNEL; | |
370 | addr.lun = 0; | |
371 | ||
372 | msg.netfn = 0x06; | |
373 | msg.cmd = IPMI_WDOG_SET_TIMER; | |
374 | msg.data = data; | |
375 | msg.data_len = sizeof(data); | |
376 | rv = ipmi_request_supply_msgs(watchdog_user, | |
377 | (struct ipmi_addr *) &addr, | |
378 | 0, | |
379 | &msg, | |
380 | NULL, | |
381 | smi_msg, | |
382 | recv_msg, | |
383 | 1); | |
384 | if (rv) { | |
385 | printk(KERN_WARNING PFX "set timeout error: %d\n", | |
386 | rv); | |
387 | } | |
388 | ||
389 | if (send_heartbeat_now) | |
390 | *send_heartbeat_now = hbnow; | |
391 | ||
392 | return rv; | |
393 | } | |
394 | ||
1da177e4 LT |
395 | static int ipmi_set_timeout(int do_heartbeat) |
396 | { | |
397 | int send_heartbeat_now; | |
398 | int rv; | |
399 | ||
400 | ||
401 | /* We can only send one of these at a time. */ | |
402 | down(&set_timeout_lock); | |
403 | ||
404 | atomic_set(&set_timeout_tofree, 2); | |
405 | ||
406 | rv = i_ipmi_set_timeout(&set_timeout_smi_msg, | |
407 | &set_timeout_recv_msg, | |
408 | &send_heartbeat_now); | |
409 | if (rv) { | |
410 | up(&set_timeout_lock); | |
411 | } else { | |
412 | if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB) | |
413 | || ((send_heartbeat_now) | |
414 | && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY))) | |
415 | { | |
416 | rv = ipmi_heartbeat(); | |
417 | } | |
418 | } | |
419 | ||
420 | return rv; | |
421 | } | |
422 | ||
423 | static void dummy_smi_free(struct ipmi_smi_msg *msg) | |
424 | { | |
425 | } | |
426 | static void dummy_recv_free(struct ipmi_recv_msg *msg) | |
427 | { | |
428 | } | |
429 | static struct ipmi_smi_msg panic_halt_smi_msg = | |
430 | { | |
431 | .done = dummy_smi_free | |
432 | }; | |
433 | static struct ipmi_recv_msg panic_halt_recv_msg = | |
434 | { | |
435 | .done = dummy_recv_free | |
436 | }; | |
437 | ||
438 | /* Special call, doesn't claim any locks. This is only to be called | |
439 | at panic or halt time, in run-to-completion mode, when the caller | |
440 | is the only CPU and the only thing that will be going is these IPMI | |
441 | calls. */ | |
442 | static void panic_halt_ipmi_set_timeout(void) | |
443 | { | |
444 | int send_heartbeat_now; | |
445 | int rv; | |
446 | ||
447 | rv = i_ipmi_set_timeout(&panic_halt_smi_msg, | |
448 | &panic_halt_recv_msg, | |
449 | &send_heartbeat_now); | |
450 | if (!rv) { | |
451 | if (send_heartbeat_now) | |
452 | panic_halt_ipmi_heartbeat(); | |
453 | } | |
454 | } | |
455 | ||
456 | /* We use a semaphore to make sure that only one thing can send a | |
457 | heartbeat at one time, because we only have one copy of the data. | |
458 | The semaphore is claimed when the set_timeout is sent and freed | |
459 | when both messages are free. */ | |
460 | static atomic_t heartbeat_tofree = ATOMIC_INIT(0); | |
461 | static DECLARE_MUTEX(heartbeat_lock); | |
462 | static DECLARE_MUTEX_LOCKED(heartbeat_wait_lock); | |
463 | static void heartbeat_free_smi(struct ipmi_smi_msg *msg) | |
464 | { | |
465 | if (atomic_dec_and_test(&heartbeat_tofree)) | |
466 | up(&heartbeat_wait_lock); | |
467 | } | |
468 | static void heartbeat_free_recv(struct ipmi_recv_msg *msg) | |
469 | { | |
470 | if (atomic_dec_and_test(&heartbeat_tofree)) | |
471 | up(&heartbeat_wait_lock); | |
472 | } | |
473 | static struct ipmi_smi_msg heartbeat_smi_msg = | |
474 | { | |
475 | .done = heartbeat_free_smi | |
476 | }; | |
477 | static struct ipmi_recv_msg heartbeat_recv_msg = | |
478 | { | |
479 | .done = heartbeat_free_recv | |
480 | }; | |
481 | ||
482 | static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = | |
483 | { | |
484 | .done = dummy_smi_free | |
485 | }; | |
486 | static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = | |
487 | { | |
488 | .done = dummy_recv_free | |
489 | }; | |
490 | ||
491 | static int ipmi_heartbeat(void) | |
492 | { | |
493 | struct kernel_ipmi_msg msg; | |
494 | int rv; | |
495 | struct ipmi_system_interface_addr addr; | |
496 | ||
497 | if (ipmi_ignore_heartbeat) { | |
498 | return 0; | |
499 | } | |
500 | ||
501 | if (ipmi_start_timer_on_heartbeat) { | |
502 | ipmi_start_timer_on_heartbeat = 0; | |
503 | ipmi_watchdog_state = action_val; | |
504 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
505 | } else if (pretimeout_since_last_heartbeat) { | |
506 | /* A pretimeout occurred, make sure we set the timeout. | |
507 | We don't want to set the action, though, we want to | |
508 | leave that alone (thus it can't be combined with the | |
509 | above operation. */ | |
510 | pretimeout_since_last_heartbeat = 0; | |
511 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
512 | } | |
513 | ||
514 | down(&heartbeat_lock); | |
515 | ||
516 | atomic_set(&heartbeat_tofree, 2); | |
517 | ||
518 | /* Don't reset the timer if we have the timer turned off, that | |
519 | re-enables the watchdog. */ | |
520 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) { | |
521 | up(&heartbeat_lock); | |
522 | return 0; | |
523 | } | |
524 | ||
525 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
526 | addr.channel = IPMI_BMC_CHANNEL; | |
527 | addr.lun = 0; | |
528 | ||
529 | msg.netfn = 0x06; | |
530 | msg.cmd = IPMI_WDOG_RESET_TIMER; | |
531 | msg.data = NULL; | |
532 | msg.data_len = 0; | |
533 | rv = ipmi_request_supply_msgs(watchdog_user, | |
534 | (struct ipmi_addr *) &addr, | |
535 | 0, | |
536 | &msg, | |
537 | NULL, | |
538 | &heartbeat_smi_msg, | |
539 | &heartbeat_recv_msg, | |
540 | 1); | |
541 | if (rv) { | |
542 | up(&heartbeat_lock); | |
543 | printk(KERN_WARNING PFX "heartbeat failure: %d\n", | |
544 | rv); | |
545 | return rv; | |
546 | } | |
547 | ||
548 | /* Wait for the heartbeat to be sent. */ | |
549 | down(&heartbeat_wait_lock); | |
550 | ||
551 | if (heartbeat_recv_msg.msg.data[0] != 0) { | |
552 | /* Got an error in the heartbeat response. It was already | |
553 | reported in ipmi_wdog_msg_handler, but we should return | |
554 | an error here. */ | |
555 | rv = -EINVAL; | |
556 | } | |
557 | ||
558 | up(&heartbeat_lock); | |
559 | ||
560 | return rv; | |
561 | } | |
562 | ||
563 | static void panic_halt_ipmi_heartbeat(void) | |
564 | { | |
565 | struct kernel_ipmi_msg msg; | |
566 | struct ipmi_system_interface_addr addr; | |
567 | ||
568 | ||
569 | /* Don't reset the timer if we have the timer turned off, that | |
570 | re-enables the watchdog. */ | |
571 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) | |
572 | return; | |
573 | ||
574 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
575 | addr.channel = IPMI_BMC_CHANNEL; | |
576 | addr.lun = 0; | |
577 | ||
578 | msg.netfn = 0x06; | |
579 | msg.cmd = IPMI_WDOG_RESET_TIMER; | |
580 | msg.data = NULL; | |
581 | msg.data_len = 0; | |
582 | ipmi_request_supply_msgs(watchdog_user, | |
583 | (struct ipmi_addr *) &addr, | |
584 | 0, | |
585 | &msg, | |
586 | NULL, | |
587 | &panic_halt_heartbeat_smi_msg, | |
588 | &panic_halt_heartbeat_recv_msg, | |
589 | 1); | |
590 | } | |
591 | ||
592 | static struct watchdog_info ident= | |
593 | { | |
594 | .options = 0, /* WDIOF_SETTIMEOUT, */ | |
595 | .firmware_version = 1, | |
596 | .identity = "IPMI" | |
597 | }; | |
598 | ||
599 | static int ipmi_ioctl(struct inode *inode, struct file *file, | |
600 | unsigned int cmd, unsigned long arg) | |
601 | { | |
602 | void __user *argp = (void __user *)arg; | |
603 | int i; | |
604 | int val; | |
605 | ||
606 | switch(cmd) { | |
607 | case WDIOC_GETSUPPORT: | |
608 | i = copy_to_user(argp, &ident, sizeof(ident)); | |
609 | return i ? -EFAULT : 0; | |
610 | ||
611 | case WDIOC_SETTIMEOUT: | |
612 | i = copy_from_user(&val, argp, sizeof(int)); | |
613 | if (i) | |
614 | return -EFAULT; | |
615 | timeout = val; | |
616 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
617 | ||
618 | case WDIOC_GETTIMEOUT: | |
619 | i = copy_to_user(argp, &timeout, sizeof(timeout)); | |
620 | if (i) | |
621 | return -EFAULT; | |
622 | return 0; | |
623 | ||
624 | case WDIOC_SET_PRETIMEOUT: | |
625 | i = copy_from_user(&val, argp, sizeof(int)); | |
626 | if (i) | |
627 | return -EFAULT; | |
628 | pretimeout = val; | |
629 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
630 | ||
631 | case WDIOC_GET_PRETIMEOUT: | |
632 | i = copy_to_user(argp, &pretimeout, sizeof(pretimeout)); | |
633 | if (i) | |
634 | return -EFAULT; | |
635 | return 0; | |
636 | ||
637 | case WDIOC_KEEPALIVE: | |
638 | return ipmi_heartbeat(); | |
639 | ||
640 | case WDIOC_SETOPTIONS: | |
641 | i = copy_from_user(&val, argp, sizeof(int)); | |
642 | if (i) | |
643 | return -EFAULT; | |
644 | if (val & WDIOS_DISABLECARD) | |
645 | { | |
646 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
647 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
648 | ipmi_start_timer_on_heartbeat = 0; | |
649 | } | |
650 | ||
651 | if (val & WDIOS_ENABLECARD) | |
652 | { | |
653 | ipmi_watchdog_state = action_val; | |
654 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
655 | } | |
656 | return 0; | |
657 | ||
658 | case WDIOC_GETSTATUS: | |
659 | val = 0; | |
660 | i = copy_to_user(argp, &val, sizeof(val)); | |
661 | if (i) | |
662 | return -EFAULT; | |
663 | return 0; | |
664 | ||
665 | default: | |
666 | return -ENOIOCTLCMD; | |
667 | } | |
668 | } | |
669 | ||
670 | static ssize_t ipmi_write(struct file *file, | |
671 | const char __user *buf, | |
672 | size_t len, | |
673 | loff_t *ppos) | |
674 | { | |
675 | int rv; | |
676 | ||
677 | if (len) { | |
678 | if (!nowayout) { | |
679 | size_t i; | |
680 | ||
681 | /* In case it was set long ago */ | |
682 | expect_close = 0; | |
683 | ||
684 | for (i = 0; i != len; i++) { | |
685 | char c; | |
686 | ||
687 | if (get_user(c, buf + i)) | |
688 | return -EFAULT; | |
689 | if (c == 'V') | |
690 | expect_close = 42; | |
691 | } | |
692 | } | |
693 | rv = ipmi_heartbeat(); | |
694 | if (rv) | |
695 | return rv; | |
696 | return 1; | |
697 | } | |
698 | return 0; | |
699 | } | |
700 | ||
701 | static ssize_t ipmi_read(struct file *file, | |
702 | char __user *buf, | |
703 | size_t count, | |
704 | loff_t *ppos) | |
705 | { | |
706 | int rv = 0; | |
707 | wait_queue_t wait; | |
708 | ||
709 | if (count <= 0) | |
710 | return 0; | |
711 | ||
712 | /* Reading returns if the pretimeout has gone off, and it only does | |
713 | it once per pretimeout. */ | |
714 | spin_lock(&ipmi_read_lock); | |
715 | if (!data_to_read) { | |
716 | if (file->f_flags & O_NONBLOCK) { | |
717 | rv = -EAGAIN; | |
718 | goto out; | |
719 | } | |
720 | ||
721 | init_waitqueue_entry(&wait, current); | |
722 | add_wait_queue(&read_q, &wait); | |
723 | while (!data_to_read) { | |
724 | set_current_state(TASK_INTERRUPTIBLE); | |
725 | spin_unlock(&ipmi_read_lock); | |
726 | schedule(); | |
727 | spin_lock(&ipmi_read_lock); | |
728 | } | |
729 | remove_wait_queue(&read_q, &wait); | |
730 | ||
731 | if (signal_pending(current)) { | |
732 | rv = -ERESTARTSYS; | |
733 | goto out; | |
734 | } | |
735 | } | |
736 | data_to_read = 0; | |
737 | ||
738 | out: | |
739 | spin_unlock(&ipmi_read_lock); | |
740 | ||
741 | if (rv == 0) { | |
742 | if (copy_to_user(buf, &data_to_read, 1)) | |
743 | rv = -EFAULT; | |
744 | else | |
745 | rv = 1; | |
746 | } | |
747 | ||
748 | return rv; | |
749 | } | |
750 | ||
751 | static int ipmi_open(struct inode *ino, struct file *filep) | |
752 | { | |
e8b33617 CM |
753 | switch (iminor(ino)) { |
754 | case WATCHDOG_MINOR: | |
755 | if (test_and_set_bit(0, &ipmi_wdog_open)) | |
1da177e4 LT |
756 | return -EBUSY; |
757 | ||
e8b33617 CM |
758 | /* Don't start the timer now, let it start on the |
759 | first heartbeat. */ | |
760 | ipmi_start_timer_on_heartbeat = 1; | |
761 | return nonseekable_open(ino, filep); | |
1da177e4 | 762 | |
e8b33617 CM |
763 | default: |
764 | return (-ENODEV); | |
1da177e4 LT |
765 | } |
766 | } | |
767 | ||
768 | static unsigned int ipmi_poll(struct file *file, poll_table *wait) | |
769 | { | |
770 | unsigned int mask = 0; | |
771 | ||
772 | poll_wait(file, &read_q, wait); | |
773 | ||
774 | spin_lock(&ipmi_read_lock); | |
775 | if (data_to_read) | |
776 | mask |= (POLLIN | POLLRDNORM); | |
777 | spin_unlock(&ipmi_read_lock); | |
778 | ||
779 | return mask; | |
780 | } | |
781 | ||
782 | static int ipmi_fasync(int fd, struct file *file, int on) | |
783 | { | |
784 | int result; | |
785 | ||
786 | result = fasync_helper(fd, file, on, &fasync_q); | |
787 | ||
788 | return (result); | |
789 | } | |
790 | ||
791 | static int ipmi_close(struct inode *ino, struct file *filep) | |
792 | { | |
793 | if (iminor(ino)==WATCHDOG_MINOR) | |
794 | { | |
795 | if (expect_close == 42) { | |
796 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
797 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
1da177e4 LT |
798 | } else { |
799 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); | |
800 | ipmi_heartbeat(); | |
801 | } | |
ec26d79f | 802 | clear_bit(0, &ipmi_wdog_open); |
1da177e4 LT |
803 | } |
804 | ||
805 | ipmi_fasync (-1, filep, 0); | |
806 | expect_close = 0; | |
807 | ||
808 | return 0; | |
809 | } | |
810 | ||
811 | static struct file_operations ipmi_wdog_fops = { | |
812 | .owner = THIS_MODULE, | |
813 | .read = ipmi_read, | |
814 | .poll = ipmi_poll, | |
815 | .write = ipmi_write, | |
816 | .ioctl = ipmi_ioctl, | |
817 | .open = ipmi_open, | |
818 | .release = ipmi_close, | |
819 | .fasync = ipmi_fasync, | |
820 | }; | |
821 | ||
822 | static struct miscdevice ipmi_wdog_miscdev = { | |
823 | .minor = WATCHDOG_MINOR, | |
824 | .name = "watchdog", | |
825 | .fops = &ipmi_wdog_fops | |
826 | }; | |
827 | ||
1da177e4 LT |
828 | static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg, |
829 | void *handler_data) | |
830 | { | |
831 | if (msg->msg.data[0] != 0) { | |
832 | printk(KERN_ERR PFX "response: Error %x on cmd %x\n", | |
833 | msg->msg.data[0], | |
834 | msg->msg.cmd); | |
835 | } | |
836 | ||
837 | ipmi_free_recv_msg(msg); | |
838 | } | |
839 | ||
840 | static void ipmi_wdog_pretimeout_handler(void *handler_data) | |
841 | { | |
842 | if (preaction_val != WDOG_PRETIMEOUT_NONE) { | |
b385676b CM |
843 | if (preop_val == WDOG_PREOP_PANIC) { |
844 | if (atomic_inc_and_test(&preop_panic_excl)) | |
845 | panic("Watchdog pre-timeout"); | |
846 | } else if (preop_val == WDOG_PREOP_GIVE_DATA) { | |
1da177e4 LT |
847 | spin_lock(&ipmi_read_lock); |
848 | data_to_read = 1; | |
849 | wake_up_interruptible(&read_q); | |
850 | kill_fasync(&fasync_q, SIGIO, POLL_IN); | |
851 | ||
852 | spin_unlock(&ipmi_read_lock); | |
853 | } | |
854 | } | |
855 | ||
856 | /* On some machines, the heartbeat will give | |
857 | an error and not work unless we re-enable | |
858 | the timer. So do so. */ | |
859 | pretimeout_since_last_heartbeat = 1; | |
860 | } | |
861 | ||
862 | static struct ipmi_user_hndl ipmi_hndlrs = | |
863 | { | |
864 | .ipmi_recv_hndl = ipmi_wdog_msg_handler, | |
865 | .ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_handler | |
866 | }; | |
867 | ||
868 | static void ipmi_register_watchdog(int ipmi_intf) | |
869 | { | |
870 | int rv = -EBUSY; | |
871 | ||
872 | down_write(®ister_sem); | |
873 | if (watchdog_user) | |
874 | goto out; | |
875 | ||
876 | rv = ipmi_create_user(ipmi_intf, &ipmi_hndlrs, NULL, &watchdog_user); | |
877 | if (rv < 0) { | |
878 | printk(KERN_CRIT PFX "Unable to register with ipmi\n"); | |
879 | goto out; | |
880 | } | |
881 | ||
882 | ipmi_get_version(watchdog_user, | |
883 | &ipmi_version_major, | |
884 | &ipmi_version_minor); | |
885 | ||
886 | rv = misc_register(&ipmi_wdog_miscdev); | |
887 | if (rv < 0) { | |
888 | ipmi_destroy_user(watchdog_user); | |
889 | watchdog_user = NULL; | |
890 | printk(KERN_CRIT PFX "Unable to register misc device\n"); | |
891 | } | |
892 | ||
893 | out: | |
894 | up_write(®ister_sem); | |
895 | ||
896 | if ((start_now) && (rv == 0)) { | |
897 | /* Run from startup, so start the timer now. */ | |
898 | start_now = 0; /* Disable this function after first startup. */ | |
899 | ipmi_watchdog_state = action_val; | |
900 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
901 | printk(KERN_INFO PFX "Starting now!\n"); | |
902 | } | |
903 | } | |
904 | ||
905 | #ifdef HAVE_NMI_HANDLER | |
906 | static int | |
907 | ipmi_nmi(void *dev_id, struct pt_regs *regs, int cpu, int handled) | |
908 | { | |
8f05ee9a CM |
909 | /* If we are not expecting a timeout, ignore it. */ |
910 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) | |
911 | return NOTIFY_DONE; | |
912 | ||
1da177e4 LT |
913 | /* If no one else handled the NMI, we assume it was the IPMI |
914 | watchdog. */ | |
8f05ee9a CM |
915 | if ((!handled) && (preop_val == WDOG_PREOP_PANIC)) { |
916 | /* On some machines, the heartbeat will give | |
917 | an error and not work unless we re-enable | |
918 | the timer. So do so. */ | |
919 | pretimeout_since_last_heartbeat = 1; | |
b385676b CM |
920 | if (atomic_inc_and_test(&preop_panic_excl)) |
921 | panic(PFX "pre-timeout"); | |
8f05ee9a | 922 | } |
1da177e4 LT |
923 | |
924 | return NOTIFY_DONE; | |
925 | } | |
926 | ||
927 | static struct nmi_handler ipmi_nmi_handler = | |
928 | { | |
929 | .link = LIST_HEAD_INIT(ipmi_nmi_handler.link), | |
930 | .dev_name = "ipmi_watchdog", | |
931 | .dev_id = NULL, | |
932 | .handler = ipmi_nmi, | |
933 | .priority = 0, /* Call us last. */ | |
934 | }; | |
cc4673ee | 935 | int nmi_handler_registered; |
1da177e4 LT |
936 | #endif |
937 | ||
938 | static int wdog_reboot_handler(struct notifier_block *this, | |
939 | unsigned long code, | |
940 | void *unused) | |
941 | { | |
942 | static int reboot_event_handled = 0; | |
943 | ||
944 | if ((watchdog_user) && (!reboot_event_handled)) { | |
945 | /* Make sure we only do this once. */ | |
946 | reboot_event_handled = 1; | |
947 | ||
948 | if (code == SYS_DOWN || code == SYS_HALT) { | |
949 | /* Disable the WDT if we are shutting down. */ | |
950 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
951 | panic_halt_ipmi_set_timeout(); | |
952 | } else { | |
953 | /* Set a long timer to let the reboot happens, but | |
954 | reboot if it hangs. */ | |
955 | timeout = 120; | |
956 | pretimeout = 0; | |
957 | ipmi_watchdog_state = WDOG_TIMEOUT_RESET; | |
958 | panic_halt_ipmi_set_timeout(); | |
959 | } | |
960 | } | |
961 | return NOTIFY_OK; | |
962 | } | |
963 | ||
964 | static struct notifier_block wdog_reboot_notifier = { | |
965 | .notifier_call = wdog_reboot_handler, | |
966 | .next = NULL, | |
967 | .priority = 0 | |
968 | }; | |
969 | ||
970 | static int wdog_panic_handler(struct notifier_block *this, | |
971 | unsigned long event, | |
972 | void *unused) | |
973 | { | |
974 | static int panic_event_handled = 0; | |
975 | ||
976 | /* On a panic, if we have a panic timeout, make sure that the thing | |
977 | reboots, even if it hangs during that panic. */ | |
978 | if (watchdog_user && !panic_event_handled) { | |
979 | /* Make sure the panic doesn't hang, and make sure we | |
980 | do this only once. */ | |
981 | panic_event_handled = 1; | |
982 | ||
983 | timeout = 255; | |
984 | pretimeout = 0; | |
985 | ipmi_watchdog_state = WDOG_TIMEOUT_RESET; | |
986 | panic_halt_ipmi_set_timeout(); | |
987 | } | |
988 | ||
989 | return NOTIFY_OK; | |
990 | } | |
991 | ||
992 | static struct notifier_block wdog_panic_notifier = { | |
993 | .notifier_call = wdog_panic_handler, | |
994 | .next = NULL, | |
995 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
996 | }; | |
997 | ||
998 | ||
50c812b2 | 999 | static void ipmi_new_smi(int if_num, struct device *device) |
1da177e4 LT |
1000 | { |
1001 | ipmi_register_watchdog(if_num); | |
1002 | } | |
1003 | ||
1004 | static void ipmi_smi_gone(int if_num) | |
1005 | { | |
1006 | /* This can never be called, because once the watchdog is | |
1007 | registered, the interface can't go away until the watchdog | |
1008 | is unregistered. */ | |
1009 | } | |
1010 | ||
1011 | static struct ipmi_smi_watcher smi_watcher = | |
1012 | { | |
1013 | .owner = THIS_MODULE, | |
1014 | .new_smi = ipmi_new_smi, | |
1015 | .smi_gone = ipmi_smi_gone | |
1016 | }; | |
1017 | ||
cc4673ee | 1018 | static int action_op(const char *inval, char *outval) |
1da177e4 | 1019 | { |
cc4673ee CM |
1020 | if (outval) |
1021 | strcpy(outval, action); | |
1022 | ||
1023 | if (!inval) | |
1024 | return 0; | |
1da177e4 | 1025 | |
cc4673ee | 1026 | if (strcmp(inval, "reset") == 0) |
1da177e4 | 1027 | action_val = WDOG_TIMEOUT_RESET; |
cc4673ee | 1028 | else if (strcmp(inval, "none") == 0) |
1da177e4 | 1029 | action_val = WDOG_TIMEOUT_NONE; |
cc4673ee | 1030 | else if (strcmp(inval, "power_cycle") == 0) |
1da177e4 | 1031 | action_val = WDOG_TIMEOUT_POWER_CYCLE; |
cc4673ee | 1032 | else if (strcmp(inval, "power_off") == 0) |
1da177e4 | 1033 | action_val = WDOG_TIMEOUT_POWER_DOWN; |
cc4673ee CM |
1034 | else |
1035 | return -EINVAL; | |
1036 | strcpy(action, inval); | |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | static int preaction_op(const char *inval, char *outval) | |
1041 | { | |
1042 | if (outval) | |
1043 | strcpy(outval, preaction); | |
1da177e4 | 1044 | |
cc4673ee CM |
1045 | if (!inval) |
1046 | return 0; | |
1047 | ||
1048 | if (strcmp(inval, "pre_none") == 0) | |
1da177e4 | 1049 | preaction_val = WDOG_PRETIMEOUT_NONE; |
cc4673ee | 1050 | else if (strcmp(inval, "pre_smi") == 0) |
1da177e4 LT |
1051 | preaction_val = WDOG_PRETIMEOUT_SMI; |
1052 | #ifdef HAVE_NMI_HANDLER | |
cc4673ee | 1053 | else if (strcmp(inval, "pre_nmi") == 0) |
1da177e4 LT |
1054 | preaction_val = WDOG_PRETIMEOUT_NMI; |
1055 | #endif | |
cc4673ee | 1056 | else if (strcmp(inval, "pre_int") == 0) |
1da177e4 | 1057 | preaction_val = WDOG_PRETIMEOUT_MSG_INT; |
cc4673ee CM |
1058 | else |
1059 | return -EINVAL; | |
1060 | strcpy(preaction, inval); | |
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | static int preop_op(const char *inval, char *outval) | |
1065 | { | |
1066 | if (outval) | |
1067 | strcpy(outval, preop); | |
1da177e4 | 1068 | |
cc4673ee CM |
1069 | if (!inval) |
1070 | return 0; | |
1071 | ||
1072 | if (strcmp(inval, "preop_none") == 0) | |
1da177e4 | 1073 | preop_val = WDOG_PREOP_NONE; |
cc4673ee | 1074 | else if (strcmp(inval, "preop_panic") == 0) |
1da177e4 | 1075 | preop_val = WDOG_PREOP_PANIC; |
cc4673ee | 1076 | else if (strcmp(inval, "preop_give_data") == 0) |
1da177e4 | 1077 | preop_val = WDOG_PREOP_GIVE_DATA; |
cc4673ee CM |
1078 | else |
1079 | return -EINVAL; | |
1080 | strcpy(preop, inval); | |
1081 | return 0; | |
1082 | } | |
1da177e4 | 1083 | |
cc4673ee CM |
1084 | static void check_parms(void) |
1085 | { | |
1da177e4 | 1086 | #ifdef HAVE_NMI_HANDLER |
cc4673ee CM |
1087 | int do_nmi = 0; |
1088 | int rv; | |
1089 | ||
1da177e4 | 1090 | if (preaction_val == WDOG_PRETIMEOUT_NMI) { |
cc4673ee | 1091 | do_nmi = 1; |
1da177e4 LT |
1092 | if (preop_val == WDOG_PREOP_GIVE_DATA) { |
1093 | printk(KERN_WARNING PFX "Pretimeout op is to give data" | |
1094 | " but NMI pretimeout is enabled, setting" | |
1095 | " pretimeout op to none\n"); | |
cc4673ee CM |
1096 | preop_op("preop_none", NULL); |
1097 | do_nmi = 0; | |
1da177e4 LT |
1098 | } |
1099 | #ifdef CONFIG_X86_LOCAL_APIC | |
1100 | if (nmi_watchdog == NMI_IO_APIC) { | |
1101 | printk(KERN_WARNING PFX "nmi_watchdog is set to IO APIC" | |
1102 | " mode (value is %d), that is incompatible" | |
1103 | " with using NMI in the IPMI watchdog." | |
1104 | " Disabling IPMI nmi pretimeout.\n", | |
1105 | nmi_watchdog); | |
1106 | preaction_val = WDOG_PRETIMEOUT_NONE; | |
cc4673ee CM |
1107 | do_nmi = 0; |
1108 | } | |
1da177e4 | 1109 | #endif |
cc4673ee CM |
1110 | } |
1111 | if (do_nmi && !nmi_handler_registered) { | |
1da177e4 LT |
1112 | rv = request_nmi(&ipmi_nmi_handler); |
1113 | if (rv) { | |
cc4673ee CM |
1114 | printk(KERN_WARNING PFX |
1115 | "Can't register nmi handler\n"); | |
1116 | return; | |
1117 | } else | |
1118 | nmi_handler_registered = 1; | |
1119 | } else if (!do_nmi && nmi_handler_registered) { | |
1120 | release_nmi(&ipmi_nmi_handler); | |
1121 | nmi_handler_registered = 0; | |
1da177e4 LT |
1122 | } |
1123 | #endif | |
cc4673ee CM |
1124 | } |
1125 | ||
1126 | static int __init ipmi_wdog_init(void) | |
1127 | { | |
1128 | int rv; | |
1129 | ||
1130 | if (action_op(action, NULL)) { | |
1131 | action_op("reset", NULL); | |
1132 | printk(KERN_INFO PFX "Unknown action '%s', defaulting to" | |
1133 | " reset\n", action); | |
1134 | } | |
1135 | ||
1136 | if (preaction_op(preaction, NULL)) { | |
1137 | preaction_op("pre_none", NULL); | |
1138 | printk(KERN_INFO PFX "Unknown preaction '%s', defaulting to" | |
1139 | " none\n", preaction); | |
1140 | } | |
1141 | ||
1142 | if (preop_op(preop, NULL)) { | |
1143 | preop_op("preop_none", NULL); | |
1144 | printk(KERN_INFO PFX "Unknown preop '%s', defaulting to" | |
1145 | " none\n", preop); | |
1146 | } | |
1147 | ||
1148 | check_parms(); | |
1da177e4 LT |
1149 | |
1150 | rv = ipmi_smi_watcher_register(&smi_watcher); | |
1151 | if (rv) { | |
1152 | #ifdef HAVE_NMI_HANDLER | |
1153 | if (preaction_val == WDOG_PRETIMEOUT_NMI) | |
1154 | release_nmi(&ipmi_nmi_handler); | |
1155 | #endif | |
1156 | printk(KERN_WARNING PFX "can't register smi watcher\n"); | |
1157 | return rv; | |
1158 | } | |
1159 | ||
1160 | register_reboot_notifier(&wdog_reboot_notifier); | |
1161 | notifier_chain_register(&panic_notifier_list, &wdog_panic_notifier); | |
1162 | ||
1fdd75bd CM |
1163 | printk(KERN_INFO PFX "driver initialized\n"); |
1164 | ||
1da177e4 LT |
1165 | return 0; |
1166 | } | |
1167 | ||
1168 | static __exit void ipmi_unregister_watchdog(void) | |
1169 | { | |
1170 | int rv; | |
1171 | ||
1172 | down_write(®ister_sem); | |
1173 | ||
1174 | #ifdef HAVE_NMI_HANDLER | |
cc4673ee | 1175 | if (nmi_handler_registered) |
1da177e4 LT |
1176 | release_nmi(&ipmi_nmi_handler); |
1177 | #endif | |
1178 | ||
1179 | notifier_chain_unregister(&panic_notifier_list, &wdog_panic_notifier); | |
1180 | unregister_reboot_notifier(&wdog_reboot_notifier); | |
1181 | ||
1182 | if (! watchdog_user) | |
1183 | goto out; | |
1184 | ||
1185 | /* Make sure no one can call us any more. */ | |
1186 | misc_deregister(&ipmi_wdog_miscdev); | |
1187 | ||
1188 | /* Wait to make sure the message makes it out. The lower layer has | |
1189 | pointers to our buffers, we want to make sure they are done before | |
1190 | we release our memory. */ | |
da4cd8df NA |
1191 | while (atomic_read(&set_timeout_tofree)) |
1192 | schedule_timeout_uninterruptible(1); | |
1da177e4 LT |
1193 | |
1194 | /* Disconnect from IPMI. */ | |
1195 | rv = ipmi_destroy_user(watchdog_user); | |
1196 | if (rv) { | |
1197 | printk(KERN_WARNING PFX "error unlinking from IPMI: %d\n", | |
1198 | rv); | |
1199 | } | |
1200 | watchdog_user = NULL; | |
1201 | ||
1202 | out: | |
1203 | up_write(®ister_sem); | |
1204 | } | |
1205 | ||
1206 | static void __exit ipmi_wdog_exit(void) | |
1207 | { | |
1208 | ipmi_smi_watcher_unregister(&smi_watcher); | |
1209 | ipmi_unregister_watchdog(); | |
1210 | } | |
1211 | module_exit(ipmi_wdog_exit); | |
1212 | module_init(ipmi_wdog_init); | |
1213 | MODULE_LICENSE("GPL"); | |
1fdd75bd CM |
1214 | MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); |
1215 | MODULE_DESCRIPTION("watchdog timer based upon the IPMI interface."); |