Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
34 | #include <linux/module.h> |
35 | #include <linux/moduleparam.h> | |
36 | #include <linux/ipmi.h> | |
37 | #include <linux/ipmi_smi.h> | |
38 | #include <linux/watchdog.h> | |
39 | #include <linux/miscdevice.h> | |
40 | #include <linux/init.h> | |
d6dfd131 | 41 | #include <linux/completion.h> |
1da177e4 LT |
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; | |
66f969d0 PE |
214 | char *dup, *s; |
215 | ||
216 | dup = kstrdup(val, GFP_KERNEL); | |
217 | if (!dup) | |
218 | return -ENOMEM; | |
219 | ||
220 | s = strstrip(dup); | |
cc4673ee CM |
221 | |
222 | down_read(®ister_sem); | |
66f969d0 | 223 | rv = fn(s, NULL); |
cc4673ee CM |
224 | if (rv) |
225 | goto out_unlock; | |
226 | ||
227 | check_parms(); | |
228 | if (watchdog_user) | |
229 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
230 | ||
231 | out_unlock: | |
232 | up_read(®ister_sem); | |
66f969d0 | 233 | kfree(dup); |
cc4673ee CM |
234 | return rv; |
235 | } | |
236 | ||
237 | static int get_param_str(char *buffer, struct kernel_param *kp) | |
238 | { | |
239 | action_fn fn = (action_fn) kp->arg; | |
240 | int rv; | |
241 | ||
242 | rv = fn(NULL, buffer); | |
243 | if (rv) | |
244 | return rv; | |
245 | return strlen(buffer); | |
246 | } | |
247 | ||
248 | module_param_call(timeout, set_param_int, get_param_int, &timeout, 0644); | |
1da177e4 | 249 | MODULE_PARM_DESC(timeout, "Timeout value in seconds."); |
cc4673ee CM |
250 | |
251 | module_param_call(pretimeout, set_param_int, get_param_int, &pretimeout, 0644); | |
1da177e4 | 252 | MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds."); |
cc4673ee CM |
253 | |
254 | module_param_call(action, set_param_str, get_param_str, action_op, 0644); | |
1da177e4 LT |
255 | MODULE_PARM_DESC(action, "Timeout action. One of: " |
256 | "reset, none, power_cycle, power_off."); | |
cc4673ee CM |
257 | |
258 | module_param_call(preaction, set_param_str, get_param_str, preaction_op, 0644); | |
1da177e4 LT |
259 | MODULE_PARM_DESC(preaction, "Pretimeout action. One of: " |
260 | "pre_none, pre_smi, pre_nmi, pre_int."); | |
cc4673ee CM |
261 | |
262 | module_param_call(preop, set_param_str, get_param_str, preop_op, 0644); | |
1da177e4 LT |
263 | MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: " |
264 | "preop_none, preop_panic, preop_give_data."); | |
cc4673ee | 265 | |
1da177e4 LT |
266 | module_param(start_now, int, 0); |
267 | MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as" | |
268 | "soon as the driver is loaded."); | |
cc4673ee CM |
269 | |
270 | module_param(nowayout, int, 0644); | |
1da177e4 LT |
271 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); |
272 | ||
273 | /* Default state of the timer. */ | |
274 | static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
275 | ||
276 | /* If shutting down via IPMI, we ignore the heartbeat. */ | |
277 | static int ipmi_ignore_heartbeat = 0; | |
278 | ||
279 | /* Is someone using the watchdog? Only one user is allowed. */ | |
280 | static unsigned long ipmi_wdog_open = 0; | |
281 | ||
282 | /* If set to 1, the heartbeat command will set the state to reset and | |
283 | start the timer. The timer doesn't normally run when the driver is | |
284 | first opened until the heartbeat is set the first time, this | |
285 | variable is used to accomplish this. */ | |
286 | static int ipmi_start_timer_on_heartbeat = 0; | |
287 | ||
288 | /* IPMI version of the BMC. */ | |
289 | static unsigned char ipmi_version_major; | |
290 | static unsigned char ipmi_version_minor; | |
291 | ||
b385676b CM |
292 | /* If a pretimeout occurs, this is used to allow only one panic to happen. */ |
293 | static atomic_t preop_panic_excl = ATOMIC_INIT(-1); | |
1da177e4 LT |
294 | |
295 | static int ipmi_heartbeat(void); | |
296 | static void panic_halt_ipmi_heartbeat(void); | |
297 | ||
298 | ||
d6dfd131 | 299 | /* We use a mutex to make sure that only one thing can send a set |
1da177e4 | 300 | timeout at one time, because we only have one copy of the data. |
d6dfd131 | 301 | The mutex is claimed when the set_timeout is sent and freed |
1da177e4 LT |
302 | when both messages are free. */ |
303 | static atomic_t set_timeout_tofree = ATOMIC_INIT(0); | |
d6dfd131 CM |
304 | static DEFINE_MUTEX(set_timeout_lock); |
305 | static DECLARE_COMPLETION(set_timeout_wait); | |
1da177e4 LT |
306 | static void set_timeout_free_smi(struct ipmi_smi_msg *msg) |
307 | { | |
308 | if (atomic_dec_and_test(&set_timeout_tofree)) | |
d6dfd131 | 309 | complete(&set_timeout_wait); |
1da177e4 LT |
310 | } |
311 | static void set_timeout_free_recv(struct ipmi_recv_msg *msg) | |
312 | { | |
313 | if (atomic_dec_and_test(&set_timeout_tofree)) | |
d6dfd131 | 314 | complete(&set_timeout_wait); |
1da177e4 LT |
315 | } |
316 | static struct ipmi_smi_msg set_timeout_smi_msg = | |
317 | { | |
318 | .done = set_timeout_free_smi | |
319 | }; | |
320 | static struct ipmi_recv_msg set_timeout_recv_msg = | |
321 | { | |
322 | .done = set_timeout_free_recv | |
323 | }; | |
324 | ||
325 | static int i_ipmi_set_timeout(struct ipmi_smi_msg *smi_msg, | |
326 | struct ipmi_recv_msg *recv_msg, | |
327 | int *send_heartbeat_now) | |
328 | { | |
329 | struct kernel_ipmi_msg msg; | |
330 | unsigned char data[6]; | |
331 | int rv; | |
332 | struct ipmi_system_interface_addr addr; | |
333 | int hbnow = 0; | |
334 | ||
335 | ||
336 | data[0] = 0; | |
337 | WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS); | |
338 | ||
339 | if ((ipmi_version_major > 1) | |
340 | || ((ipmi_version_major == 1) && (ipmi_version_minor >= 5))) | |
341 | { | |
342 | /* This is an IPMI 1.5-only feature. */ | |
343 | data[0] |= WDOG_DONT_STOP_ON_SET; | |
344 | } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { | |
345 | /* In ipmi 1.0, setting the timer stops the watchdog, we | |
346 | need to start it back up again. */ | |
347 | hbnow = 1; | |
348 | } | |
349 | ||
350 | data[1] = 0; | |
351 | WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state); | |
8f05ee9a | 352 | if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) { |
1da177e4 LT |
353 | WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val); |
354 | data[2] = pretimeout; | |
355 | } else { | |
356 | WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE); | |
357 | data[2] = 0; /* No pretimeout. */ | |
358 | } | |
359 | data[3] = 0; | |
360 | WDOG_SET_TIMEOUT(data[4], data[5], timeout); | |
361 | ||
362 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
363 | addr.channel = IPMI_BMC_CHANNEL; | |
364 | addr.lun = 0; | |
365 | ||
366 | msg.netfn = 0x06; | |
367 | msg.cmd = IPMI_WDOG_SET_TIMER; | |
368 | msg.data = data; | |
369 | msg.data_len = sizeof(data); | |
370 | rv = ipmi_request_supply_msgs(watchdog_user, | |
371 | (struct ipmi_addr *) &addr, | |
372 | 0, | |
373 | &msg, | |
374 | NULL, | |
375 | smi_msg, | |
376 | recv_msg, | |
377 | 1); | |
378 | if (rv) { | |
379 | printk(KERN_WARNING PFX "set timeout error: %d\n", | |
380 | rv); | |
381 | } | |
382 | ||
383 | if (send_heartbeat_now) | |
384 | *send_heartbeat_now = hbnow; | |
385 | ||
386 | return rv; | |
387 | } | |
388 | ||
1da177e4 LT |
389 | static int ipmi_set_timeout(int do_heartbeat) |
390 | { | |
391 | int send_heartbeat_now; | |
392 | int rv; | |
393 | ||
394 | ||
395 | /* We can only send one of these at a time. */ | |
d6dfd131 | 396 | mutex_lock(&set_timeout_lock); |
1da177e4 LT |
397 | |
398 | atomic_set(&set_timeout_tofree, 2); | |
399 | ||
400 | rv = i_ipmi_set_timeout(&set_timeout_smi_msg, | |
401 | &set_timeout_recv_msg, | |
402 | &send_heartbeat_now); | |
403 | if (rv) { | |
d6dfd131 CM |
404 | mutex_unlock(&set_timeout_lock); |
405 | goto out; | |
406 | } | |
407 | ||
408 | wait_for_completion(&set_timeout_wait); | |
409 | ||
410 | if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB) | |
411 | || ((send_heartbeat_now) | |
412 | && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY))) | |
413 | { | |
414 | rv = ipmi_heartbeat(); | |
1da177e4 | 415 | } |
d6dfd131 | 416 | mutex_unlock(&set_timeout_lock); |
1da177e4 | 417 | |
d6dfd131 | 418 | out: |
1da177e4 LT |
419 | return rv; |
420 | } | |
421 | ||
422 | static void dummy_smi_free(struct ipmi_smi_msg *msg) | |
423 | { | |
424 | } | |
425 | static void dummy_recv_free(struct ipmi_recv_msg *msg) | |
426 | { | |
427 | } | |
428 | static struct ipmi_smi_msg panic_halt_smi_msg = | |
429 | { | |
430 | .done = dummy_smi_free | |
431 | }; | |
432 | static struct ipmi_recv_msg panic_halt_recv_msg = | |
433 | { | |
434 | .done = dummy_recv_free | |
435 | }; | |
436 | ||
437 | /* Special call, doesn't claim any locks. This is only to be called | |
438 | at panic or halt time, in run-to-completion mode, when the caller | |
439 | is the only CPU and the only thing that will be going is these IPMI | |
440 | calls. */ | |
441 | static void panic_halt_ipmi_set_timeout(void) | |
442 | { | |
443 | int send_heartbeat_now; | |
444 | int rv; | |
445 | ||
446 | rv = i_ipmi_set_timeout(&panic_halt_smi_msg, | |
447 | &panic_halt_recv_msg, | |
448 | &send_heartbeat_now); | |
449 | if (!rv) { | |
450 | if (send_heartbeat_now) | |
451 | panic_halt_ipmi_heartbeat(); | |
452 | } | |
453 | } | |
454 | ||
455 | /* We use a semaphore to make sure that only one thing can send a | |
456 | heartbeat at one time, because we only have one copy of the data. | |
457 | The semaphore is claimed when the set_timeout is sent and freed | |
458 | when both messages are free. */ | |
459 | static atomic_t heartbeat_tofree = ATOMIC_INIT(0); | |
d6dfd131 CM |
460 | static DEFINE_MUTEX(heartbeat_lock); |
461 | static DECLARE_COMPLETION(heartbeat_wait); | |
1da177e4 LT |
462 | static void heartbeat_free_smi(struct ipmi_smi_msg *msg) |
463 | { | |
464 | if (atomic_dec_and_test(&heartbeat_tofree)) | |
d6dfd131 | 465 | complete(&heartbeat_wait); |
1da177e4 LT |
466 | } |
467 | static void heartbeat_free_recv(struct ipmi_recv_msg *msg) | |
468 | { | |
469 | if (atomic_dec_and_test(&heartbeat_tofree)) | |
d6dfd131 | 470 | complete(&heartbeat_wait); |
1da177e4 LT |
471 | } |
472 | static struct ipmi_smi_msg heartbeat_smi_msg = | |
473 | { | |
474 | .done = heartbeat_free_smi | |
475 | }; | |
476 | static struct ipmi_recv_msg heartbeat_recv_msg = | |
477 | { | |
478 | .done = heartbeat_free_recv | |
479 | }; | |
480 | ||
481 | static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = | |
482 | { | |
483 | .done = dummy_smi_free | |
484 | }; | |
485 | static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = | |
486 | { | |
487 | .done = dummy_recv_free | |
488 | }; | |
489 | ||
490 | static int ipmi_heartbeat(void) | |
491 | { | |
492 | struct kernel_ipmi_msg msg; | |
493 | int rv; | |
494 | struct ipmi_system_interface_addr addr; | |
495 | ||
496 | if (ipmi_ignore_heartbeat) { | |
497 | return 0; | |
498 | } | |
499 | ||
500 | if (ipmi_start_timer_on_heartbeat) { | |
501 | ipmi_start_timer_on_heartbeat = 0; | |
502 | ipmi_watchdog_state = action_val; | |
503 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
504 | } else if (pretimeout_since_last_heartbeat) { | |
505 | /* A pretimeout occurred, make sure we set the timeout. | |
506 | We don't want to set the action, though, we want to | |
507 | leave that alone (thus it can't be combined with the | |
508 | above operation. */ | |
509 | pretimeout_since_last_heartbeat = 0; | |
510 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
511 | } | |
512 | ||
d6dfd131 | 513 | mutex_lock(&heartbeat_lock); |
1da177e4 LT |
514 | |
515 | atomic_set(&heartbeat_tofree, 2); | |
516 | ||
517 | /* Don't reset the timer if we have the timer turned off, that | |
518 | re-enables the watchdog. */ | |
519 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) { | |
d6dfd131 | 520 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
521 | return 0; |
522 | } | |
523 | ||
524 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
525 | addr.channel = IPMI_BMC_CHANNEL; | |
526 | addr.lun = 0; | |
527 | ||
528 | msg.netfn = 0x06; | |
529 | msg.cmd = IPMI_WDOG_RESET_TIMER; | |
530 | msg.data = NULL; | |
531 | msg.data_len = 0; | |
532 | rv = ipmi_request_supply_msgs(watchdog_user, | |
533 | (struct ipmi_addr *) &addr, | |
534 | 0, | |
535 | &msg, | |
536 | NULL, | |
537 | &heartbeat_smi_msg, | |
538 | &heartbeat_recv_msg, | |
539 | 1); | |
540 | if (rv) { | |
d6dfd131 | 541 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
542 | printk(KERN_WARNING PFX "heartbeat failure: %d\n", |
543 | rv); | |
544 | return rv; | |
545 | } | |
546 | ||
547 | /* Wait for the heartbeat to be sent. */ | |
d6dfd131 | 548 | wait_for_completion(&heartbeat_wait); |
1da177e4 LT |
549 | |
550 | if (heartbeat_recv_msg.msg.data[0] != 0) { | |
551 | /* Got an error in the heartbeat response. It was already | |
552 | reported in ipmi_wdog_msg_handler, but we should return | |
553 | an error here. */ | |
554 | rv = -EINVAL; | |
555 | } | |
556 | ||
d6dfd131 | 557 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
558 | |
559 | return rv; | |
560 | } | |
561 | ||
562 | static void panic_halt_ipmi_heartbeat(void) | |
563 | { | |
564 | struct kernel_ipmi_msg msg; | |
565 | struct ipmi_system_interface_addr addr; | |
566 | ||
567 | ||
568 | /* Don't reset the timer if we have the timer turned off, that | |
569 | re-enables the watchdog. */ | |
570 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) | |
571 | return; | |
572 | ||
573 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
574 | addr.channel = IPMI_BMC_CHANNEL; | |
575 | addr.lun = 0; | |
576 | ||
577 | msg.netfn = 0x06; | |
578 | msg.cmd = IPMI_WDOG_RESET_TIMER; | |
579 | msg.data = NULL; | |
580 | msg.data_len = 0; | |
581 | ipmi_request_supply_msgs(watchdog_user, | |
582 | (struct ipmi_addr *) &addr, | |
583 | 0, | |
584 | &msg, | |
585 | NULL, | |
586 | &panic_halt_heartbeat_smi_msg, | |
587 | &panic_halt_heartbeat_recv_msg, | |
588 | 1); | |
589 | } | |
590 | ||
8a3628d5 | 591 | static struct watchdog_info ident = |
1da177e4 LT |
592 | { |
593 | .options = 0, /* WDIOF_SETTIMEOUT, */ | |
594 | .firmware_version = 1, | |
595 | .identity = "IPMI" | |
596 | }; | |
597 | ||
598 | static int ipmi_ioctl(struct inode *inode, struct file *file, | |
599 | unsigned int cmd, unsigned long arg) | |
600 | { | |
601 | void __user *argp = (void __user *)arg; | |
602 | int i; | |
603 | int val; | |
604 | ||
605 | switch(cmd) { | |
606 | case WDIOC_GETSUPPORT: | |
607 | i = copy_to_user(argp, &ident, sizeof(ident)); | |
608 | return i ? -EFAULT : 0; | |
609 | ||
610 | case WDIOC_SETTIMEOUT: | |
611 | i = copy_from_user(&val, argp, sizeof(int)); | |
612 | if (i) | |
613 | return -EFAULT; | |
614 | timeout = val; | |
615 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
616 | ||
617 | case WDIOC_GETTIMEOUT: | |
618 | i = copy_to_user(argp, &timeout, sizeof(timeout)); | |
619 | if (i) | |
620 | return -EFAULT; | |
621 | return 0; | |
622 | ||
623 | case WDIOC_SET_PRETIMEOUT: | |
624 | i = copy_from_user(&val, argp, sizeof(int)); | |
625 | if (i) | |
626 | return -EFAULT; | |
627 | pretimeout = val; | |
628 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
629 | ||
630 | case WDIOC_GET_PRETIMEOUT: | |
631 | i = copy_to_user(argp, &pretimeout, sizeof(pretimeout)); | |
632 | if (i) | |
633 | return -EFAULT; | |
634 | return 0; | |
635 | ||
636 | case WDIOC_KEEPALIVE: | |
637 | return ipmi_heartbeat(); | |
638 | ||
639 | case WDIOC_SETOPTIONS: | |
640 | i = copy_from_user(&val, argp, sizeof(int)); | |
641 | if (i) | |
642 | return -EFAULT; | |
643 | if (val & WDIOS_DISABLECARD) | |
644 | { | |
645 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
646 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
647 | ipmi_start_timer_on_heartbeat = 0; | |
648 | } | |
649 | ||
650 | if (val & WDIOS_ENABLECARD) | |
651 | { | |
652 | ipmi_watchdog_state = action_val; | |
653 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
654 | } | |
655 | return 0; | |
656 | ||
657 | case WDIOC_GETSTATUS: | |
658 | val = 0; | |
659 | i = copy_to_user(argp, &val, sizeof(val)); | |
660 | if (i) | |
661 | return -EFAULT; | |
662 | return 0; | |
663 | ||
664 | default: | |
665 | return -ENOIOCTLCMD; | |
666 | } | |
667 | } | |
668 | ||
669 | static ssize_t ipmi_write(struct file *file, | |
670 | const char __user *buf, | |
671 | size_t len, | |
672 | loff_t *ppos) | |
673 | { | |
674 | int rv; | |
675 | ||
676 | if (len) { | |
677 | if (!nowayout) { | |
678 | size_t i; | |
679 | ||
680 | /* In case it was set long ago */ | |
681 | expect_close = 0; | |
682 | ||
683 | for (i = 0; i != len; i++) { | |
684 | char c; | |
685 | ||
686 | if (get_user(c, buf + i)) | |
687 | return -EFAULT; | |
688 | if (c == 'V') | |
689 | expect_close = 42; | |
690 | } | |
691 | } | |
692 | rv = ipmi_heartbeat(); | |
693 | if (rv) | |
694 | return rv; | |
695 | return 1; | |
696 | } | |
697 | return 0; | |
698 | } | |
699 | ||
700 | static ssize_t ipmi_read(struct file *file, | |
701 | char __user *buf, | |
702 | size_t count, | |
703 | loff_t *ppos) | |
704 | { | |
705 | int rv = 0; | |
706 | wait_queue_t wait; | |
707 | ||
708 | if (count <= 0) | |
709 | return 0; | |
710 | ||
711 | /* Reading returns if the pretimeout has gone off, and it only does | |
712 | it once per pretimeout. */ | |
713 | spin_lock(&ipmi_read_lock); | |
714 | if (!data_to_read) { | |
715 | if (file->f_flags & O_NONBLOCK) { | |
716 | rv = -EAGAIN; | |
717 | goto out; | |
718 | } | |
719 | ||
720 | init_waitqueue_entry(&wait, current); | |
721 | add_wait_queue(&read_q, &wait); | |
722 | while (!data_to_read) { | |
723 | set_current_state(TASK_INTERRUPTIBLE); | |
724 | spin_unlock(&ipmi_read_lock); | |
725 | schedule(); | |
726 | spin_lock(&ipmi_read_lock); | |
727 | } | |
728 | remove_wait_queue(&read_q, &wait); | |
729 | ||
730 | if (signal_pending(current)) { | |
731 | rv = -ERESTARTSYS; | |
732 | goto out; | |
733 | } | |
734 | } | |
735 | data_to_read = 0; | |
736 | ||
737 | out: | |
738 | spin_unlock(&ipmi_read_lock); | |
739 | ||
740 | if (rv == 0) { | |
741 | if (copy_to_user(buf, &data_to_read, 1)) | |
742 | rv = -EFAULT; | |
743 | else | |
744 | rv = 1; | |
745 | } | |
746 | ||
747 | return rv; | |
748 | } | |
749 | ||
750 | static int ipmi_open(struct inode *ino, struct file *filep) | |
751 | { | |
e8b33617 CM |
752 | switch (iminor(ino)) { |
753 | case WATCHDOG_MINOR: | |
754 | if (test_and_set_bit(0, &ipmi_wdog_open)) | |
1da177e4 LT |
755 | return -EBUSY; |
756 | ||
e8b33617 CM |
757 | /* Don't start the timer now, let it start on the |
758 | first heartbeat. */ | |
759 | ipmi_start_timer_on_heartbeat = 1; | |
760 | return nonseekable_open(ino, filep); | |
1da177e4 | 761 | |
e8b33617 CM |
762 | default: |
763 | return (-ENODEV); | |
1da177e4 LT |
764 | } |
765 | } | |
766 | ||
767 | static unsigned int ipmi_poll(struct file *file, poll_table *wait) | |
768 | { | |
769 | unsigned int mask = 0; | |
770 | ||
771 | poll_wait(file, &read_q, wait); | |
772 | ||
773 | spin_lock(&ipmi_read_lock); | |
774 | if (data_to_read) | |
775 | mask |= (POLLIN | POLLRDNORM); | |
776 | spin_unlock(&ipmi_read_lock); | |
777 | ||
778 | return mask; | |
779 | } | |
780 | ||
781 | static int ipmi_fasync(int fd, struct file *file, int on) | |
782 | { | |
783 | int result; | |
784 | ||
785 | result = fasync_helper(fd, file, on, &fasync_q); | |
786 | ||
787 | return (result); | |
788 | } | |
789 | ||
790 | static int ipmi_close(struct inode *ino, struct file *filep) | |
791 | { | |
8a3628d5 | 792 | if (iminor(ino) == WATCHDOG_MINOR) { |
1da177e4 LT |
793 | if (expect_close == 42) { |
794 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
795 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
1da177e4 | 796 | } else { |
8a3628d5 CM |
797 | printk(KERN_CRIT PFX |
798 | "Unexpected close, not stopping watchdog!\n"); | |
1da177e4 LT |
799 | ipmi_heartbeat(); |
800 | } | |
ec26d79f | 801 | clear_bit(0, &ipmi_wdog_open); |
1da177e4 LT |
802 | } |
803 | ||
804 | ipmi_fasync (-1, filep, 0); | |
805 | expect_close = 0; | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
62322d25 | 810 | static const struct file_operations ipmi_wdog_fops = { |
1da177e4 LT |
811 | .owner = THIS_MODULE, |
812 | .read = ipmi_read, | |
813 | .poll = ipmi_poll, | |
814 | .write = ipmi_write, | |
815 | .ioctl = ipmi_ioctl, | |
816 | .open = ipmi_open, | |
817 | .release = ipmi_close, | |
818 | .fasync = ipmi_fasync, | |
819 | }; | |
820 | ||
821 | static struct miscdevice ipmi_wdog_miscdev = { | |
822 | .minor = WATCHDOG_MINOR, | |
823 | .name = "watchdog", | |
824 | .fops = &ipmi_wdog_fops | |
825 | }; | |
826 | ||
1da177e4 LT |
827 | static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg, |
828 | void *handler_data) | |
829 | { | |
830 | if (msg->msg.data[0] != 0) { | |
831 | printk(KERN_ERR PFX "response: Error %x on cmd %x\n", | |
832 | msg->msg.data[0], | |
833 | msg->msg.cmd); | |
834 | } | |
835 | ||
836 | ipmi_free_recv_msg(msg); | |
837 | } | |
838 | ||
839 | static void ipmi_wdog_pretimeout_handler(void *handler_data) | |
840 | { | |
841 | if (preaction_val != WDOG_PRETIMEOUT_NONE) { | |
b385676b CM |
842 | if (preop_val == WDOG_PREOP_PANIC) { |
843 | if (atomic_inc_and_test(&preop_panic_excl)) | |
844 | panic("Watchdog pre-timeout"); | |
845 | } else if (preop_val == WDOG_PREOP_GIVE_DATA) { | |
1da177e4 LT |
846 | spin_lock(&ipmi_read_lock); |
847 | data_to_read = 1; | |
848 | wake_up_interruptible(&read_q); | |
849 | kill_fasync(&fasync_q, SIGIO, POLL_IN); | |
850 | ||
851 | spin_unlock(&ipmi_read_lock); | |
852 | } | |
853 | } | |
854 | ||
855 | /* On some machines, the heartbeat will give | |
856 | an error and not work unless we re-enable | |
857 | the timer. So do so. */ | |
858 | pretimeout_since_last_heartbeat = 1; | |
859 | } | |
860 | ||
861 | static struct ipmi_user_hndl ipmi_hndlrs = | |
862 | { | |
863 | .ipmi_recv_hndl = ipmi_wdog_msg_handler, | |
864 | .ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_handler | |
865 | }; | |
866 | ||
867 | static void ipmi_register_watchdog(int ipmi_intf) | |
868 | { | |
869 | int rv = -EBUSY; | |
870 | ||
871 | down_write(®ister_sem); | |
872 | if (watchdog_user) | |
873 | goto out; | |
874 | ||
875 | rv = ipmi_create_user(ipmi_intf, &ipmi_hndlrs, NULL, &watchdog_user); | |
876 | if (rv < 0) { | |
877 | printk(KERN_CRIT PFX "Unable to register with ipmi\n"); | |
878 | goto out; | |
879 | } | |
880 | ||
881 | ipmi_get_version(watchdog_user, | |
882 | &ipmi_version_major, | |
883 | &ipmi_version_minor); | |
884 | ||
885 | rv = misc_register(&ipmi_wdog_miscdev); | |
886 | if (rv < 0) { | |
887 | ipmi_destroy_user(watchdog_user); | |
888 | watchdog_user = NULL; | |
889 | printk(KERN_CRIT PFX "Unable to register misc device\n"); | |
890 | } | |
891 | ||
892 | out: | |
893 | up_write(®ister_sem); | |
894 | ||
895 | if ((start_now) && (rv == 0)) { | |
896 | /* Run from startup, so start the timer now. */ | |
897 | start_now = 0; /* Disable this function after first startup. */ | |
898 | ipmi_watchdog_state = action_val; | |
899 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
900 | printk(KERN_INFO PFX "Starting now!\n"); | |
901 | } | |
902 | } | |
903 | ||
904 | #ifdef HAVE_NMI_HANDLER | |
905 | static int | |
906 | ipmi_nmi(void *dev_id, struct pt_regs *regs, int cpu, int handled) | |
907 | { | |
8f05ee9a CM |
908 | /* If we are not expecting a timeout, ignore it. */ |
909 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) | |
910 | return NOTIFY_DONE; | |
911 | ||
1da177e4 LT |
912 | /* If no one else handled the NMI, we assume it was the IPMI |
913 | watchdog. */ | |
8f05ee9a CM |
914 | if ((!handled) && (preop_val == WDOG_PREOP_PANIC)) { |
915 | /* On some machines, the heartbeat will give | |
916 | an error and not work unless we re-enable | |
917 | the timer. So do so. */ | |
918 | pretimeout_since_last_heartbeat = 1; | |
b385676b CM |
919 | if (atomic_inc_and_test(&preop_panic_excl)) |
920 | panic(PFX "pre-timeout"); | |
8f05ee9a | 921 | } |
1da177e4 LT |
922 | |
923 | return NOTIFY_DONE; | |
924 | } | |
925 | ||
926 | static struct nmi_handler ipmi_nmi_handler = | |
927 | { | |
928 | .link = LIST_HEAD_INIT(ipmi_nmi_handler.link), | |
929 | .dev_name = "ipmi_watchdog", | |
930 | .dev_id = NULL, | |
931 | .handler = ipmi_nmi, | |
932 | .priority = 0, /* Call us last. */ | |
933 | }; | |
cc4673ee | 934 | int nmi_handler_registered; |
1da177e4 LT |
935 | #endif |
936 | ||
937 | static int wdog_reboot_handler(struct notifier_block *this, | |
938 | unsigned long code, | |
939 | void *unused) | |
940 | { | |
941 | static int reboot_event_handled = 0; | |
942 | ||
943 | if ((watchdog_user) && (!reboot_event_handled)) { | |
944 | /* Make sure we only do this once. */ | |
945 | reboot_event_handled = 1; | |
946 | ||
947 | if (code == SYS_DOWN || code == SYS_HALT) { | |
948 | /* Disable the WDT if we are shutting down. */ | |
949 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
950 | panic_halt_ipmi_set_timeout(); | |
96febe9f | 951 | } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { |
1da177e4 | 952 | /* Set a long timer to let the reboot happens, but |
96febe9f CM |
953 | reboot if it hangs, but only if the watchdog |
954 | timer was already running. */ | |
1da177e4 LT |
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 | ||
96febe9f CM |
976 | /* On a panic, if we have a panic timeout, make sure to extend |
977 | the watchdog timer to a reasonable value to complete the | |
978 | panic, if the watchdog timer is running. Plus the | |
979 | pretimeout is meaningless at panic time. */ | |
980 | if (watchdog_user && !panic_event_handled && | |
981 | ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { | |
982 | /* Make sure we do this only once. */ | |
1da177e4 LT |
983 | panic_event_handled = 1; |
984 | ||
985 | timeout = 255; | |
986 | pretimeout = 0; | |
1da177e4 LT |
987 | panic_halt_ipmi_set_timeout(); |
988 | } | |
989 | ||
990 | return NOTIFY_OK; | |
991 | } | |
992 | ||
993 | static struct notifier_block wdog_panic_notifier = { | |
994 | .notifier_call = wdog_panic_handler, | |
995 | .next = NULL, | |
996 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
997 | }; | |
998 | ||
999 | ||
50c812b2 | 1000 | static void ipmi_new_smi(int if_num, struct device *device) |
1da177e4 LT |
1001 | { |
1002 | ipmi_register_watchdog(if_num); | |
1003 | } | |
1004 | ||
1005 | static void ipmi_smi_gone(int if_num) | |
1006 | { | |
1007 | /* This can never be called, because once the watchdog is | |
1008 | registered, the interface can't go away until the watchdog | |
1009 | is unregistered. */ | |
1010 | } | |
1011 | ||
1012 | static struct ipmi_smi_watcher smi_watcher = | |
1013 | { | |
1014 | .owner = THIS_MODULE, | |
1015 | .new_smi = ipmi_new_smi, | |
1016 | .smi_gone = ipmi_smi_gone | |
1017 | }; | |
1018 | ||
cc4673ee | 1019 | static int action_op(const char *inval, char *outval) |
1da177e4 | 1020 | { |
cc4673ee CM |
1021 | if (outval) |
1022 | strcpy(outval, action); | |
1023 | ||
1024 | if (!inval) | |
1025 | return 0; | |
1da177e4 | 1026 | |
cc4673ee | 1027 | if (strcmp(inval, "reset") == 0) |
1da177e4 | 1028 | action_val = WDOG_TIMEOUT_RESET; |
cc4673ee | 1029 | else if (strcmp(inval, "none") == 0) |
1da177e4 | 1030 | action_val = WDOG_TIMEOUT_NONE; |
cc4673ee | 1031 | else if (strcmp(inval, "power_cycle") == 0) |
1da177e4 | 1032 | action_val = WDOG_TIMEOUT_POWER_CYCLE; |
cc4673ee | 1033 | else if (strcmp(inval, "power_off") == 0) |
1da177e4 | 1034 | action_val = WDOG_TIMEOUT_POWER_DOWN; |
cc4673ee CM |
1035 | else |
1036 | return -EINVAL; | |
1037 | strcpy(action, inval); | |
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | static int preaction_op(const char *inval, char *outval) | |
1042 | { | |
1043 | if (outval) | |
1044 | strcpy(outval, preaction); | |
1da177e4 | 1045 | |
cc4673ee CM |
1046 | if (!inval) |
1047 | return 0; | |
1048 | ||
1049 | if (strcmp(inval, "pre_none") == 0) | |
1da177e4 | 1050 | preaction_val = WDOG_PRETIMEOUT_NONE; |
cc4673ee | 1051 | else if (strcmp(inval, "pre_smi") == 0) |
1da177e4 LT |
1052 | preaction_val = WDOG_PRETIMEOUT_SMI; |
1053 | #ifdef HAVE_NMI_HANDLER | |
cc4673ee | 1054 | else if (strcmp(inval, "pre_nmi") == 0) |
1da177e4 LT |
1055 | preaction_val = WDOG_PRETIMEOUT_NMI; |
1056 | #endif | |
cc4673ee | 1057 | else if (strcmp(inval, "pre_int") == 0) |
1da177e4 | 1058 | preaction_val = WDOG_PRETIMEOUT_MSG_INT; |
cc4673ee CM |
1059 | else |
1060 | return -EINVAL; | |
1061 | strcpy(preaction, inval); | |
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | static int preop_op(const char *inval, char *outval) | |
1066 | { | |
1067 | if (outval) | |
1068 | strcpy(outval, preop); | |
1da177e4 | 1069 | |
cc4673ee CM |
1070 | if (!inval) |
1071 | return 0; | |
1072 | ||
1073 | if (strcmp(inval, "preop_none") == 0) | |
1da177e4 | 1074 | preop_val = WDOG_PREOP_NONE; |
cc4673ee | 1075 | else if (strcmp(inval, "preop_panic") == 0) |
1da177e4 | 1076 | preop_val = WDOG_PREOP_PANIC; |
cc4673ee | 1077 | else if (strcmp(inval, "preop_give_data") == 0) |
1da177e4 | 1078 | preop_val = WDOG_PREOP_GIVE_DATA; |
cc4673ee CM |
1079 | else |
1080 | return -EINVAL; | |
1081 | strcpy(preop, inval); | |
1082 | return 0; | |
1083 | } | |
1da177e4 | 1084 | |
cc4673ee CM |
1085 | static void check_parms(void) |
1086 | { | |
1da177e4 | 1087 | #ifdef HAVE_NMI_HANDLER |
cc4673ee CM |
1088 | int do_nmi = 0; |
1089 | int rv; | |
1090 | ||
1da177e4 | 1091 | if (preaction_val == WDOG_PRETIMEOUT_NMI) { |
cc4673ee | 1092 | do_nmi = 1; |
1da177e4 LT |
1093 | if (preop_val == WDOG_PREOP_GIVE_DATA) { |
1094 | printk(KERN_WARNING PFX "Pretimeout op is to give data" | |
1095 | " but NMI pretimeout is enabled, setting" | |
1096 | " pretimeout op to none\n"); | |
cc4673ee CM |
1097 | preop_op("preop_none", NULL); |
1098 | do_nmi = 0; | |
1da177e4 LT |
1099 | } |
1100 | #ifdef CONFIG_X86_LOCAL_APIC | |
1101 | if (nmi_watchdog == NMI_IO_APIC) { | |
1102 | printk(KERN_WARNING PFX "nmi_watchdog is set to IO APIC" | |
1103 | " mode (value is %d), that is incompatible" | |
1104 | " with using NMI in the IPMI watchdog." | |
1105 | " Disabling IPMI nmi pretimeout.\n", | |
1106 | nmi_watchdog); | |
1107 | preaction_val = WDOG_PRETIMEOUT_NONE; | |
cc4673ee CM |
1108 | do_nmi = 0; |
1109 | } | |
1da177e4 | 1110 | #endif |
cc4673ee CM |
1111 | } |
1112 | if (do_nmi && !nmi_handler_registered) { | |
1da177e4 LT |
1113 | rv = request_nmi(&ipmi_nmi_handler); |
1114 | if (rv) { | |
cc4673ee CM |
1115 | printk(KERN_WARNING PFX |
1116 | "Can't register nmi handler\n"); | |
1117 | return; | |
1118 | } else | |
1119 | nmi_handler_registered = 1; | |
1120 | } else if (!do_nmi && nmi_handler_registered) { | |
1121 | release_nmi(&ipmi_nmi_handler); | |
1122 | nmi_handler_registered = 0; | |
1da177e4 LT |
1123 | } |
1124 | #endif | |
cc4673ee CM |
1125 | } |
1126 | ||
1127 | static int __init ipmi_wdog_init(void) | |
1128 | { | |
1129 | int rv; | |
1130 | ||
1131 | if (action_op(action, NULL)) { | |
1132 | action_op("reset", NULL); | |
1133 | printk(KERN_INFO PFX "Unknown action '%s', defaulting to" | |
1134 | " reset\n", action); | |
1135 | } | |
1136 | ||
1137 | if (preaction_op(preaction, NULL)) { | |
1138 | preaction_op("pre_none", NULL); | |
1139 | printk(KERN_INFO PFX "Unknown preaction '%s', defaulting to" | |
1140 | " none\n", preaction); | |
1141 | } | |
1142 | ||
1143 | if (preop_op(preop, NULL)) { | |
1144 | preop_op("preop_none", NULL); | |
1145 | printk(KERN_INFO PFX "Unknown preop '%s', defaulting to" | |
1146 | " none\n", preop); | |
1147 | } | |
1148 | ||
1149 | check_parms(); | |
1da177e4 LT |
1150 | |
1151 | rv = ipmi_smi_watcher_register(&smi_watcher); | |
1152 | if (rv) { | |
1153 | #ifdef HAVE_NMI_HANDLER | |
1154 | if (preaction_val == WDOG_PRETIMEOUT_NMI) | |
1155 | release_nmi(&ipmi_nmi_handler); | |
1156 | #endif | |
1157 | printk(KERN_WARNING PFX "can't register smi watcher\n"); | |
1158 | return rv; | |
1159 | } | |
1160 | ||
1161 | register_reboot_notifier(&wdog_reboot_notifier); | |
e041c683 AS |
1162 | atomic_notifier_chain_register(&panic_notifier_list, |
1163 | &wdog_panic_notifier); | |
1da177e4 | 1164 | |
1fdd75bd CM |
1165 | printk(KERN_INFO PFX "driver initialized\n"); |
1166 | ||
1da177e4 LT |
1167 | return 0; |
1168 | } | |
1169 | ||
1170 | static __exit void ipmi_unregister_watchdog(void) | |
1171 | { | |
1172 | int rv; | |
1173 | ||
1174 | down_write(®ister_sem); | |
1175 | ||
1176 | #ifdef HAVE_NMI_HANDLER | |
cc4673ee | 1177 | if (nmi_handler_registered) |
1da177e4 LT |
1178 | release_nmi(&ipmi_nmi_handler); |
1179 | #endif | |
1180 | ||
e041c683 AS |
1181 | atomic_notifier_chain_unregister(&panic_notifier_list, |
1182 | &wdog_panic_notifier); | |
1da177e4 LT |
1183 | unregister_reboot_notifier(&wdog_reboot_notifier); |
1184 | ||
1185 | if (! watchdog_user) | |
1186 | goto out; | |
1187 | ||
1188 | /* Make sure no one can call us any more. */ | |
1189 | misc_deregister(&ipmi_wdog_miscdev); | |
1190 | ||
1191 | /* Wait to make sure the message makes it out. The lower layer has | |
1192 | pointers to our buffers, we want to make sure they are done before | |
1193 | we release our memory. */ | |
da4cd8df NA |
1194 | while (atomic_read(&set_timeout_tofree)) |
1195 | schedule_timeout_uninterruptible(1); | |
1da177e4 LT |
1196 | |
1197 | /* Disconnect from IPMI. */ | |
1198 | rv = ipmi_destroy_user(watchdog_user); | |
1199 | if (rv) { | |
1200 | printk(KERN_WARNING PFX "error unlinking from IPMI: %d\n", | |
1201 | rv); | |
1202 | } | |
1203 | watchdog_user = NULL; | |
1204 | ||
1205 | out: | |
1206 | up_write(®ister_sem); | |
1207 | } | |
1208 | ||
1209 | static void __exit ipmi_wdog_exit(void) | |
1210 | { | |
1211 | ipmi_smi_watcher_unregister(&smi_watcher); | |
1212 | ipmi_unregister_watchdog(); | |
1213 | } | |
1214 | module_exit(ipmi_wdog_exit); | |
1215 | module_init(ipmi_wdog_init); | |
1216 | MODULE_LICENSE("GPL"); | |
1fdd75bd CM |
1217 | MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); |
1218 | MODULE_DESCRIPTION("watchdog timer based upon the IPMI interface."); |