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 | ||
1da177e4 LT |
34 | #include <linux/module.h> |
35 | #include <linux/moduleparam.h> | |
36 | #include <linux/ipmi.h> | |
37 | #include <linux/ipmi_smi.h> | |
af96f010 | 38 | #include <linux/smp_lock.h> |
1da177e4 LT |
39 | #include <linux/watchdog.h> |
40 | #include <linux/miscdevice.h> | |
41 | #include <linux/init.h> | |
d6dfd131 | 42 | #include <linux/completion.h> |
1eeb66a1 | 43 | #include <linux/kdebug.h> |
1da177e4 LT |
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> | |
cc4673ee CM |
52 | #include <linux/string.h> |
53 | #include <linux/ctype.h> | |
612b5a8d | 54 | #include <linux/delay.h> |
b385676b | 55 | #include <asm/atomic.h> |
f64da958 | 56 | |
612b5a8d | 57 | #ifdef CONFIG_X86 |
36c7dc44 CM |
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 | */ | |
612b5a8d CM |
67 | #include <asm/kdebug.h> |
68 | #define HAVE_DIE_NMI | |
1da177e4 LT |
69 | #endif |
70 | ||
71 | #define PFX "IPMI Watchdog: " | |
72 | ||
1da177e4 LT |
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 | |
36c7dc44 CM |
101 | /* Cause data to be available to read. Doesn't work in NMI mode. */ |
102 | #define WDOG_PREOP_GIVE_DATA 2 | |
1da177e4 LT |
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 | ||
36c7dc44 CM |
113 | /* |
114 | * Byte 3 of the get command, byte 4 of the get response is the | |
115 | * pre-timeout in seconds. | |
116 | */ | |
1da177e4 LT |
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 | ||
36c7dc44 CM |
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 | */ | |
1da177e4 LT |
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 | ||
4bfdf378 | 152 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 153 | |
0c8204b3 | 154 | static ipmi_user_t watchdog_user; |
b2c03941 | 155 | static int watchdog_ifnum; |
1da177e4 LT |
156 | |
157 | /* Default the timeout to 10 seconds. */ | |
158 | static int timeout = 10; | |
159 | ||
160 | /* The pre-timeout is disabled by default. */ | |
0c8204b3 | 161 | static int pretimeout; |
1da177e4 LT |
162 | |
163 | /* Default action is to reset the board on a timeout. */ | |
164 | static unsigned char action_val = WDOG_TIMEOUT_RESET; | |
165 | ||
166 | static char action[16] = "reset"; | |
167 | ||
168 | static unsigned char preaction_val = WDOG_PRETIMEOUT_NONE; | |
169 | ||
170 | static char preaction[16] = "pre_none"; | |
171 | ||
172 | static unsigned char preop_val = WDOG_PREOP_NONE; | |
173 | ||
174 | static char preop[16] = "preop_none"; | |
175 | static DEFINE_SPINLOCK(ipmi_read_lock); | |
0c8204b3 | 176 | static char data_to_read; |
1da177e4 | 177 | static DECLARE_WAIT_QUEUE_HEAD(read_q); |
0c8204b3 RD |
178 | static struct fasync_struct *fasync_q; |
179 | static char pretimeout_since_last_heartbeat; | |
1da177e4 LT |
180 | static char expect_close; |
181 | ||
b2c03941 CM |
182 | static int ifnum_to_use = -1; |
183 | ||
cc4673ee CM |
184 | /* Parameters to ipmi_set_timeout */ |
185 | #define IPMI_SET_TIMEOUT_NO_HB 0 | |
186 | #define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1 | |
187 | #define IPMI_SET_TIMEOUT_FORCE_HB 2 | |
188 | ||
189 | static int ipmi_set_timeout(int do_heartbeat); | |
b2c03941 CM |
190 | static void ipmi_register_watchdog(int ipmi_intf); |
191 | static void ipmi_unregister_watchdog(int ipmi_intf); | |
cc4673ee | 192 | |
36c7dc44 CM |
193 | /* |
194 | * If true, the driver will start running as soon as it is configured | |
195 | * and ready. | |
196 | */ | |
0c8204b3 | 197 | static int start_now; |
1da177e4 | 198 | |
cc4673ee CM |
199 | static int set_param_int(const char *val, struct kernel_param *kp) |
200 | { | |
201 | char *endp; | |
202 | int l; | |
203 | int rv = 0; | |
204 | ||
205 | if (!val) | |
206 | return -EINVAL; | |
207 | l = simple_strtoul(val, &endp, 0); | |
208 | if (endp == val) | |
209 | return -EINVAL; | |
210 | ||
cc4673ee CM |
211 | *((int *)kp->arg) = l; |
212 | if (watchdog_user) | |
213 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
cc4673ee CM |
214 | |
215 | return rv; | |
216 | } | |
217 | ||
218 | static int get_param_int(char *buffer, struct kernel_param *kp) | |
219 | { | |
220 | return sprintf(buffer, "%i", *((int *)kp->arg)); | |
221 | } | |
222 | ||
223 | typedef int (*action_fn)(const char *intval, char *outval); | |
224 | ||
225 | static int action_op(const char *inval, char *outval); | |
226 | static int preaction_op(const char *inval, char *outval); | |
227 | static int preop_op(const char *inval, char *outval); | |
228 | static void check_parms(void); | |
229 | ||
230 | static int set_param_str(const char *val, struct kernel_param *kp) | |
231 | { | |
232 | action_fn fn = (action_fn) kp->arg; | |
233 | int rv = 0; | |
43cdff92 SD |
234 | char valcp[16]; |
235 | char *s; | |
66f969d0 | 236 | |
43cdff92 SD |
237 | strncpy(valcp, val, 16); |
238 | valcp[15] = '\0'; | |
66f969d0 | 239 | |
43cdff92 | 240 | s = strstrip(valcp); |
cc4673ee | 241 | |
66f969d0 | 242 | rv = fn(s, NULL); |
cc4673ee | 243 | if (rv) |
f8fbcd3b | 244 | goto out; |
cc4673ee CM |
245 | |
246 | check_parms(); | |
247 | if (watchdog_user) | |
248 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
249 | ||
f8fbcd3b | 250 | out: |
cc4673ee CM |
251 | return rv; |
252 | } | |
253 | ||
254 | static int get_param_str(char *buffer, struct kernel_param *kp) | |
255 | { | |
256 | action_fn fn = (action_fn) kp->arg; | |
257 | int rv; | |
258 | ||
259 | rv = fn(NULL, buffer); | |
260 | if (rv) | |
261 | return rv; | |
262 | return strlen(buffer); | |
263 | } | |
264 | ||
b2c03941 CM |
265 | |
266 | static int set_param_wdog_ifnum(const char *val, struct kernel_param *kp) | |
267 | { | |
268 | int rv = param_set_int(val, kp); | |
269 | if (rv) | |
270 | return rv; | |
271 | if ((ifnum_to_use < 0) || (ifnum_to_use == watchdog_ifnum)) | |
272 | return 0; | |
273 | ||
274 | ipmi_unregister_watchdog(watchdog_ifnum); | |
275 | ipmi_register_watchdog(ifnum_to_use); | |
276 | return 0; | |
277 | } | |
278 | ||
279 | module_param_call(ifnum_to_use, set_param_wdog_ifnum, get_param_int, | |
280 | &ifnum_to_use, 0644); | |
281 | MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog " | |
282 | "timer. Setting to -1 defaults to the first registered " | |
283 | "interface"); | |
284 | ||
cc4673ee | 285 | module_param_call(timeout, set_param_int, get_param_int, &timeout, 0644); |
1da177e4 | 286 | MODULE_PARM_DESC(timeout, "Timeout value in seconds."); |
cc4673ee CM |
287 | |
288 | module_param_call(pretimeout, set_param_int, get_param_int, &pretimeout, 0644); | |
1da177e4 | 289 | MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds."); |
cc4673ee CM |
290 | |
291 | module_param_call(action, set_param_str, get_param_str, action_op, 0644); | |
1da177e4 LT |
292 | MODULE_PARM_DESC(action, "Timeout action. One of: " |
293 | "reset, none, power_cycle, power_off."); | |
cc4673ee CM |
294 | |
295 | module_param_call(preaction, set_param_str, get_param_str, preaction_op, 0644); | |
1da177e4 LT |
296 | MODULE_PARM_DESC(preaction, "Pretimeout action. One of: " |
297 | "pre_none, pre_smi, pre_nmi, pre_int."); | |
cc4673ee CM |
298 | |
299 | module_param_call(preop, set_param_str, get_param_str, preop_op, 0644); | |
1da177e4 LT |
300 | MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: " |
301 | "preop_none, preop_panic, preop_give_data."); | |
cc4673ee | 302 | |
b2c03941 | 303 | module_param(start_now, int, 0444); |
1da177e4 LT |
304 | MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as" |
305 | "soon as the driver is loaded."); | |
cc4673ee CM |
306 | |
307 | module_param(nowayout, int, 0644); | |
b2c03941 CM |
308 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " |
309 | "(default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
1da177e4 LT |
310 | |
311 | /* Default state of the timer. */ | |
312 | static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
313 | ||
314 | /* If shutting down via IPMI, we ignore the heartbeat. */ | |
0c8204b3 | 315 | static int ipmi_ignore_heartbeat; |
1da177e4 LT |
316 | |
317 | /* Is someone using the watchdog? Only one user is allowed. */ | |
0c8204b3 | 318 | static unsigned long ipmi_wdog_open; |
1da177e4 | 319 | |
36c7dc44 CM |
320 | /* |
321 | * If set to 1, the heartbeat command will set the state to reset and | |
322 | * start the timer. The timer doesn't normally run when the driver is | |
323 | * first opened until the heartbeat is set the first time, this | |
324 | * variable is used to accomplish this. | |
325 | */ | |
0c8204b3 | 326 | static int ipmi_start_timer_on_heartbeat; |
1da177e4 LT |
327 | |
328 | /* IPMI version of the BMC. */ | |
329 | static unsigned char ipmi_version_major; | |
330 | static unsigned char ipmi_version_minor; | |
331 | ||
b385676b CM |
332 | /* If a pretimeout occurs, this is used to allow only one panic to happen. */ |
333 | static atomic_t preop_panic_excl = ATOMIC_INIT(-1); | |
1da177e4 | 334 | |
612b5a8d CM |
335 | #ifdef HAVE_DIE_NMI |
336 | static int testing_nmi; | |
337 | static int nmi_handler_registered; | |
338 | #endif | |
339 | ||
1da177e4 | 340 | static int ipmi_heartbeat(void); |
1da177e4 | 341 | |
36c7dc44 CM |
342 | /* |
343 | * We use a mutex to make sure that only one thing can send a set | |
344 | * timeout at one time, because we only have one copy of the data. | |
345 | * The mutex is claimed when the set_timeout is sent and freed | |
346 | * when both messages are free. | |
347 | */ | |
1da177e4 | 348 | static atomic_t set_timeout_tofree = ATOMIC_INIT(0); |
d6dfd131 CM |
349 | static DEFINE_MUTEX(set_timeout_lock); |
350 | static DECLARE_COMPLETION(set_timeout_wait); | |
1da177e4 LT |
351 | static void set_timeout_free_smi(struct ipmi_smi_msg *msg) |
352 | { | |
353 | if (atomic_dec_and_test(&set_timeout_tofree)) | |
d6dfd131 | 354 | complete(&set_timeout_wait); |
1da177e4 LT |
355 | } |
356 | static void set_timeout_free_recv(struct ipmi_recv_msg *msg) | |
357 | { | |
358 | if (atomic_dec_and_test(&set_timeout_tofree)) | |
d6dfd131 | 359 | complete(&set_timeout_wait); |
1da177e4 | 360 | } |
36c7dc44 | 361 | static struct ipmi_smi_msg set_timeout_smi_msg = { |
1da177e4 LT |
362 | .done = set_timeout_free_smi |
363 | }; | |
36c7dc44 | 364 | static struct ipmi_recv_msg set_timeout_recv_msg = { |
1da177e4 LT |
365 | .done = set_timeout_free_recv |
366 | }; | |
36c7dc44 | 367 | |
1da177e4 LT |
368 | static int i_ipmi_set_timeout(struct ipmi_smi_msg *smi_msg, |
369 | struct ipmi_recv_msg *recv_msg, | |
370 | int *send_heartbeat_now) | |
371 | { | |
372 | struct kernel_ipmi_msg msg; | |
373 | unsigned char data[6]; | |
374 | int rv; | |
375 | struct ipmi_system_interface_addr addr; | |
376 | int hbnow = 0; | |
377 | ||
378 | ||
612b5a8d CM |
379 | /* These can be cleared as we are setting the timeout. */ |
380 | pretimeout_since_last_heartbeat = 0; | |
381 | ||
1da177e4 LT |
382 | data[0] = 0; |
383 | WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS); | |
384 | ||
385 | if ((ipmi_version_major > 1) | |
36c7dc44 | 386 | || ((ipmi_version_major == 1) && (ipmi_version_minor >= 5))) { |
1da177e4 LT |
387 | /* This is an IPMI 1.5-only feature. */ |
388 | data[0] |= WDOG_DONT_STOP_ON_SET; | |
389 | } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { | |
36c7dc44 CM |
390 | /* |
391 | * In ipmi 1.0, setting the timer stops the watchdog, we | |
392 | * need to start it back up again. | |
393 | */ | |
1da177e4 LT |
394 | hbnow = 1; |
395 | } | |
396 | ||
397 | data[1] = 0; | |
398 | WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state); | |
8f05ee9a | 399 | if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) { |
1da177e4 LT |
400 | WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val); |
401 | data[2] = pretimeout; | |
402 | } else { | |
403 | WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE); | |
404 | data[2] = 0; /* No pretimeout. */ | |
405 | } | |
406 | data[3] = 0; | |
407 | WDOG_SET_TIMEOUT(data[4], data[5], timeout); | |
408 | ||
409 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
410 | addr.channel = IPMI_BMC_CHANNEL; | |
411 | addr.lun = 0; | |
412 | ||
413 | msg.netfn = 0x06; | |
414 | msg.cmd = IPMI_WDOG_SET_TIMER; | |
415 | msg.data = data; | |
416 | msg.data_len = sizeof(data); | |
417 | rv = ipmi_request_supply_msgs(watchdog_user, | |
418 | (struct ipmi_addr *) &addr, | |
419 | 0, | |
420 | &msg, | |
421 | NULL, | |
422 | smi_msg, | |
423 | recv_msg, | |
424 | 1); | |
425 | if (rv) { | |
426 | printk(KERN_WARNING PFX "set timeout error: %d\n", | |
427 | rv); | |
428 | } | |
429 | ||
430 | if (send_heartbeat_now) | |
431 | *send_heartbeat_now = hbnow; | |
432 | ||
433 | return rv; | |
434 | } | |
435 | ||
1da177e4 LT |
436 | static int ipmi_set_timeout(int do_heartbeat) |
437 | { | |
438 | int send_heartbeat_now; | |
439 | int rv; | |
440 | ||
441 | ||
442 | /* We can only send one of these at a time. */ | |
d6dfd131 | 443 | mutex_lock(&set_timeout_lock); |
1da177e4 LT |
444 | |
445 | atomic_set(&set_timeout_tofree, 2); | |
446 | ||
447 | rv = i_ipmi_set_timeout(&set_timeout_smi_msg, | |
448 | &set_timeout_recv_msg, | |
449 | &send_heartbeat_now); | |
450 | if (rv) { | |
d6dfd131 CM |
451 | mutex_unlock(&set_timeout_lock); |
452 | goto out; | |
453 | } | |
454 | ||
455 | wait_for_completion(&set_timeout_wait); | |
456 | ||
612b5a8d CM |
457 | mutex_unlock(&set_timeout_lock); |
458 | ||
d6dfd131 CM |
459 | if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB) |
460 | || ((send_heartbeat_now) | |
461 | && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY))) | |
d6dfd131 | 462 | rv = ipmi_heartbeat(); |
1da177e4 | 463 | |
d6dfd131 | 464 | out: |
1da177e4 LT |
465 | return rv; |
466 | } | |
467 | ||
fcfa4724 CM |
468 | static atomic_t panic_done_count = ATOMIC_INIT(0); |
469 | ||
470 | static void panic_smi_free(struct ipmi_smi_msg *msg) | |
1da177e4 | 471 | { |
fcfa4724 | 472 | atomic_dec(&panic_done_count); |
1da177e4 | 473 | } |
fcfa4724 CM |
474 | static void panic_recv_free(struct ipmi_recv_msg *msg) |
475 | { | |
476 | atomic_dec(&panic_done_count); | |
477 | } | |
478 | ||
36c7dc44 | 479 | static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = { |
fcfa4724 CM |
480 | .done = panic_smi_free |
481 | }; | |
36c7dc44 | 482 | static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = { |
fcfa4724 CM |
483 | .done = panic_recv_free |
484 | }; | |
485 | ||
486 | static void panic_halt_ipmi_heartbeat(void) | |
487 | { | |
488 | struct kernel_ipmi_msg msg; | |
489 | struct ipmi_system_interface_addr addr; | |
490 | int rv; | |
491 | ||
36c7dc44 CM |
492 | /* |
493 | * Don't reset the timer if we have the timer turned off, that | |
494 | * re-enables the watchdog. | |
495 | */ | |
fcfa4724 CM |
496 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) |
497 | return; | |
498 | ||
499 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
500 | addr.channel = IPMI_BMC_CHANNEL; | |
501 | addr.lun = 0; | |
502 | ||
503 | msg.netfn = 0x06; | |
504 | msg.cmd = IPMI_WDOG_RESET_TIMER; | |
505 | msg.data = NULL; | |
506 | msg.data_len = 0; | |
507 | rv = ipmi_request_supply_msgs(watchdog_user, | |
508 | (struct ipmi_addr *) &addr, | |
509 | 0, | |
510 | &msg, | |
511 | NULL, | |
512 | &panic_halt_heartbeat_smi_msg, | |
513 | &panic_halt_heartbeat_recv_msg, | |
514 | 1); | |
515 | if (!rv) | |
516 | atomic_add(2, &panic_done_count); | |
1da177e4 | 517 | } |
fcfa4724 | 518 | |
36c7dc44 | 519 | static struct ipmi_smi_msg panic_halt_smi_msg = { |
fcfa4724 | 520 | .done = panic_smi_free |
1da177e4 | 521 | }; |
36c7dc44 | 522 | static struct ipmi_recv_msg panic_halt_recv_msg = { |
fcfa4724 | 523 | .done = panic_recv_free |
1da177e4 LT |
524 | }; |
525 | ||
36c7dc44 CM |
526 | /* |
527 | * Special call, doesn't claim any locks. This is only to be called | |
528 | * at panic or halt time, in run-to-completion mode, when the caller | |
529 | * is the only CPU and the only thing that will be going is these IPMI | |
530 | * calls. | |
531 | */ | |
1da177e4 LT |
532 | static void panic_halt_ipmi_set_timeout(void) |
533 | { | |
534 | int send_heartbeat_now; | |
535 | int rv; | |
536 | ||
fcfa4724 CM |
537 | /* Wait for the messages to be free. */ |
538 | while (atomic_read(&panic_done_count) != 0) | |
539 | ipmi_poll_interface(watchdog_user); | |
1da177e4 LT |
540 | rv = i_ipmi_set_timeout(&panic_halt_smi_msg, |
541 | &panic_halt_recv_msg, | |
542 | &send_heartbeat_now); | |
543 | if (!rv) { | |
fcfa4724 | 544 | atomic_add(2, &panic_done_count); |
1da177e4 LT |
545 | if (send_heartbeat_now) |
546 | panic_halt_ipmi_heartbeat(); | |
fcfa4724 CM |
547 | } else |
548 | printk(KERN_WARNING PFX | |
549 | "Unable to extend the watchdog timeout."); | |
550 | while (atomic_read(&panic_done_count) != 0) | |
551 | ipmi_poll_interface(watchdog_user); | |
1da177e4 LT |
552 | } |
553 | ||
36c7dc44 CM |
554 | /* |
555 | * We use a mutex to make sure that only one thing can send a | |
556 | * heartbeat at one time, because we only have one copy of the data. | |
557 | * The semaphore is claimed when the set_timeout is sent and freed | |
558 | * when both messages are free. | |
559 | */ | |
1da177e4 | 560 | static atomic_t heartbeat_tofree = ATOMIC_INIT(0); |
d6dfd131 CM |
561 | static DEFINE_MUTEX(heartbeat_lock); |
562 | static DECLARE_COMPLETION(heartbeat_wait); | |
1da177e4 LT |
563 | static void heartbeat_free_smi(struct ipmi_smi_msg *msg) |
564 | { | |
565 | if (atomic_dec_and_test(&heartbeat_tofree)) | |
d6dfd131 | 566 | complete(&heartbeat_wait); |
1da177e4 LT |
567 | } |
568 | static void heartbeat_free_recv(struct ipmi_recv_msg *msg) | |
569 | { | |
570 | if (atomic_dec_and_test(&heartbeat_tofree)) | |
d6dfd131 | 571 | complete(&heartbeat_wait); |
1da177e4 | 572 | } |
36c7dc44 | 573 | static struct ipmi_smi_msg heartbeat_smi_msg = { |
1da177e4 LT |
574 | .done = heartbeat_free_smi |
575 | }; | |
36c7dc44 | 576 | static struct ipmi_recv_msg heartbeat_recv_msg = { |
1da177e4 LT |
577 | .done = heartbeat_free_recv |
578 | }; | |
36c7dc44 | 579 | |
1da177e4 LT |
580 | static int ipmi_heartbeat(void) |
581 | { | |
582 | struct kernel_ipmi_msg msg; | |
583 | int rv; | |
584 | struct ipmi_system_interface_addr addr; | |
585 | ||
612b5a8d | 586 | if (ipmi_ignore_heartbeat) |
1da177e4 | 587 | return 0; |
1da177e4 LT |
588 | |
589 | if (ipmi_start_timer_on_heartbeat) { | |
faa8b6c3 | 590 | ipmi_start_timer_on_heartbeat = 0; |
1da177e4 LT |
591 | ipmi_watchdog_state = action_val; |
592 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
593 | } else if (pretimeout_since_last_heartbeat) { | |
36c7dc44 CM |
594 | /* |
595 | * A pretimeout occurred, make sure we set the timeout. | |
596 | * We don't want to set the action, though, we want to | |
597 | * leave that alone (thus it can't be combined with the | |
598 | * above operation. | |
599 | */ | |
1da177e4 LT |
600 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
601 | } | |
602 | ||
d6dfd131 | 603 | mutex_lock(&heartbeat_lock); |
1da177e4 LT |
604 | |
605 | atomic_set(&heartbeat_tofree, 2); | |
606 | ||
36c7dc44 CM |
607 | /* |
608 | * Don't reset the timer if we have the timer turned off, that | |
609 | * re-enables the watchdog. | |
610 | */ | |
1da177e4 | 611 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) { |
d6dfd131 | 612 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
613 | return 0; |
614 | } | |
615 | ||
616 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
617 | addr.channel = IPMI_BMC_CHANNEL; | |
618 | addr.lun = 0; | |
619 | ||
620 | msg.netfn = 0x06; | |
621 | msg.cmd = IPMI_WDOG_RESET_TIMER; | |
622 | msg.data = NULL; | |
623 | msg.data_len = 0; | |
624 | rv = ipmi_request_supply_msgs(watchdog_user, | |
625 | (struct ipmi_addr *) &addr, | |
626 | 0, | |
627 | &msg, | |
628 | NULL, | |
629 | &heartbeat_smi_msg, | |
630 | &heartbeat_recv_msg, | |
631 | 1); | |
632 | if (rv) { | |
d6dfd131 | 633 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
634 | printk(KERN_WARNING PFX "heartbeat failure: %d\n", |
635 | rv); | |
636 | return rv; | |
637 | } | |
638 | ||
639 | /* Wait for the heartbeat to be sent. */ | |
d6dfd131 | 640 | wait_for_completion(&heartbeat_wait); |
1da177e4 LT |
641 | |
642 | if (heartbeat_recv_msg.msg.data[0] != 0) { | |
36c7dc44 CM |
643 | /* |
644 | * Got an error in the heartbeat response. It was already | |
645 | * reported in ipmi_wdog_msg_handler, but we should return | |
646 | * an error here. | |
647 | */ | |
648 | rv = -EINVAL; | |
1da177e4 LT |
649 | } |
650 | ||
d6dfd131 | 651 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
652 | |
653 | return rv; | |
654 | } | |
655 | ||
36c7dc44 | 656 | static struct watchdog_info ident = { |
1da177e4 LT |
657 | .options = 0, /* WDIOF_SETTIMEOUT, */ |
658 | .firmware_version = 1, | |
659 | .identity = "IPMI" | |
660 | }; | |
661 | ||
662 | static int ipmi_ioctl(struct inode *inode, struct file *file, | |
663 | unsigned int cmd, unsigned long arg) | |
664 | { | |
665 | void __user *argp = (void __user *)arg; | |
666 | int i; | |
667 | int val; | |
668 | ||
36c7dc44 | 669 | switch (cmd) { |
1da177e4 LT |
670 | case WDIOC_GETSUPPORT: |
671 | i = copy_to_user(argp, &ident, sizeof(ident)); | |
672 | return i ? -EFAULT : 0; | |
673 | ||
674 | case WDIOC_SETTIMEOUT: | |
675 | i = copy_from_user(&val, argp, sizeof(int)); | |
676 | if (i) | |
677 | return -EFAULT; | |
678 | timeout = val; | |
679 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
680 | ||
681 | case WDIOC_GETTIMEOUT: | |
682 | i = copy_to_user(argp, &timeout, sizeof(timeout)); | |
683 | if (i) | |
684 | return -EFAULT; | |
685 | return 0; | |
686 | ||
687 | case WDIOC_SET_PRETIMEOUT: | |
783e6bcd | 688 | case WDIOC_SETPRETIMEOUT: |
1da177e4 LT |
689 | i = copy_from_user(&val, argp, sizeof(int)); |
690 | if (i) | |
691 | return -EFAULT; | |
692 | pretimeout = val; | |
693 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
694 | ||
695 | case WDIOC_GET_PRETIMEOUT: | |
783e6bcd | 696 | case WDIOC_GETPRETIMEOUT: |
1da177e4 LT |
697 | i = copy_to_user(argp, &pretimeout, sizeof(pretimeout)); |
698 | if (i) | |
699 | return -EFAULT; | |
700 | return 0; | |
701 | ||
702 | case WDIOC_KEEPALIVE: | |
703 | return ipmi_heartbeat(); | |
704 | ||
705 | case WDIOC_SETOPTIONS: | |
706 | i = copy_from_user(&val, argp, sizeof(int)); | |
707 | if (i) | |
708 | return -EFAULT; | |
36c7dc44 | 709 | if (val & WDIOS_DISABLECARD) { |
1da177e4 LT |
710 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
711 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
712 | ipmi_start_timer_on_heartbeat = 0; | |
713 | } | |
714 | ||
36c7dc44 | 715 | if (val & WDIOS_ENABLECARD) { |
1da177e4 LT |
716 | ipmi_watchdog_state = action_val; |
717 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
718 | } | |
719 | return 0; | |
720 | ||
721 | case WDIOC_GETSTATUS: | |
722 | val = 0; | |
723 | i = copy_to_user(argp, &val, sizeof(val)); | |
724 | if (i) | |
725 | return -EFAULT; | |
726 | return 0; | |
727 | ||
728 | default: | |
729 | return -ENOIOCTLCMD; | |
730 | } | |
731 | } | |
732 | ||
733 | static ssize_t ipmi_write(struct file *file, | |
734 | const char __user *buf, | |
735 | size_t len, | |
736 | loff_t *ppos) | |
737 | { | |
738 | int rv; | |
739 | ||
740 | if (len) { | |
36c7dc44 CM |
741 | if (!nowayout) { |
742 | size_t i; | |
1da177e4 LT |
743 | |
744 | /* In case it was set long ago */ | |
745 | expect_close = 0; | |
746 | ||
36c7dc44 | 747 | for (i = 0; i != len; i++) { |
1da177e4 LT |
748 | char c; |
749 | ||
750 | if (get_user(c, buf + i)) | |
751 | return -EFAULT; | |
752 | if (c == 'V') | |
753 | expect_close = 42; | |
754 | } | |
755 | } | |
756 | rv = ipmi_heartbeat(); | |
757 | if (rv) | |
758 | return rv; | |
1da177e4 | 759 | } |
3976df9b | 760 | return len; |
1da177e4 LT |
761 | } |
762 | ||
763 | static ssize_t ipmi_read(struct file *file, | |
764 | char __user *buf, | |
765 | size_t count, | |
766 | loff_t *ppos) | |
767 | { | |
768 | int rv = 0; | |
769 | wait_queue_t wait; | |
770 | ||
771 | if (count <= 0) | |
772 | return 0; | |
773 | ||
36c7dc44 CM |
774 | /* |
775 | * Reading returns if the pretimeout has gone off, and it only does | |
776 | * it once per pretimeout. | |
777 | */ | |
1da177e4 LT |
778 | spin_lock(&ipmi_read_lock); |
779 | if (!data_to_read) { | |
780 | if (file->f_flags & O_NONBLOCK) { | |
781 | rv = -EAGAIN; | |
782 | goto out; | |
783 | } | |
36c7dc44 | 784 | |
1da177e4 LT |
785 | init_waitqueue_entry(&wait, current); |
786 | add_wait_queue(&read_q, &wait); | |
787 | while (!data_to_read) { | |
788 | set_current_state(TASK_INTERRUPTIBLE); | |
789 | spin_unlock(&ipmi_read_lock); | |
790 | schedule(); | |
791 | spin_lock(&ipmi_read_lock); | |
792 | } | |
793 | remove_wait_queue(&read_q, &wait); | |
36c7dc44 | 794 | |
1da177e4 LT |
795 | if (signal_pending(current)) { |
796 | rv = -ERESTARTSYS; | |
797 | goto out; | |
798 | } | |
799 | } | |
800 | data_to_read = 0; | |
801 | ||
802 | out: | |
803 | spin_unlock(&ipmi_read_lock); | |
804 | ||
805 | if (rv == 0) { | |
806 | if (copy_to_user(buf, &data_to_read, 1)) | |
807 | rv = -EFAULT; | |
808 | else | |
809 | rv = 1; | |
810 | } | |
811 | ||
812 | return rv; | |
813 | } | |
814 | ||
815 | static int ipmi_open(struct inode *ino, struct file *filep) | |
816 | { | |
36c7dc44 CM |
817 | switch (iminor(ino)) { |
818 | case WATCHDOG_MINOR: | |
e8b33617 | 819 | if (test_and_set_bit(0, &ipmi_wdog_open)) |
36c7dc44 | 820 | return -EBUSY; |
1da177e4 | 821 | |
af96f010 AB |
822 | cycle_kernel_lock(); |
823 | ||
36c7dc44 CM |
824 | /* |
825 | * Don't start the timer now, let it start on the | |
826 | * first heartbeat. | |
827 | */ | |
e8b33617 CM |
828 | ipmi_start_timer_on_heartbeat = 1; |
829 | return nonseekable_open(ino, filep); | |
1da177e4 | 830 | |
e8b33617 CM |
831 | default: |
832 | return (-ENODEV); | |
36c7dc44 | 833 | } |
1da177e4 LT |
834 | } |
835 | ||
836 | static unsigned int ipmi_poll(struct file *file, poll_table *wait) | |
837 | { | |
838 | unsigned int mask = 0; | |
36c7dc44 | 839 | |
1da177e4 LT |
840 | poll_wait(file, &read_q, wait); |
841 | ||
842 | spin_lock(&ipmi_read_lock); | |
843 | if (data_to_read) | |
844 | mask |= (POLLIN | POLLRDNORM); | |
845 | spin_unlock(&ipmi_read_lock); | |
846 | ||
847 | return mask; | |
848 | } | |
849 | ||
850 | static int ipmi_fasync(int fd, struct file *file, int on) | |
851 | { | |
852 | int result; | |
853 | ||
854 | result = fasync_helper(fd, file, on, &fasync_q); | |
855 | ||
856 | return (result); | |
857 | } | |
858 | ||
859 | static int ipmi_close(struct inode *ino, struct file *filep) | |
860 | { | |
8a3628d5 | 861 | if (iminor(ino) == WATCHDOG_MINOR) { |
1da177e4 LT |
862 | if (expect_close == 42) { |
863 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
864 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
1da177e4 | 865 | } else { |
8a3628d5 CM |
866 | printk(KERN_CRIT PFX |
867 | "Unexpected close, not stopping watchdog!\n"); | |
1da177e4 LT |
868 | ipmi_heartbeat(); |
869 | } | |
ec26d79f | 870 | clear_bit(0, &ipmi_wdog_open); |
1da177e4 LT |
871 | } |
872 | ||
1da177e4 LT |
873 | expect_close = 0; |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
62322d25 | 878 | static const struct file_operations ipmi_wdog_fops = { |
1da177e4 LT |
879 | .owner = THIS_MODULE, |
880 | .read = ipmi_read, | |
881 | .poll = ipmi_poll, | |
882 | .write = ipmi_write, | |
883 | .ioctl = ipmi_ioctl, | |
884 | .open = ipmi_open, | |
885 | .release = ipmi_close, | |
886 | .fasync = ipmi_fasync, | |
887 | }; | |
888 | ||
889 | static struct miscdevice ipmi_wdog_miscdev = { | |
890 | .minor = WATCHDOG_MINOR, | |
891 | .name = "watchdog", | |
892 | .fops = &ipmi_wdog_fops | |
893 | }; | |
894 | ||
1da177e4 LT |
895 | static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg, |
896 | void *handler_data) | |
897 | { | |
898 | if (msg->msg.data[0] != 0) { | |
899 | printk(KERN_ERR PFX "response: Error %x on cmd %x\n", | |
900 | msg->msg.data[0], | |
901 | msg->msg.cmd); | |
902 | } | |
36c7dc44 | 903 | |
1da177e4 LT |
904 | ipmi_free_recv_msg(msg); |
905 | } | |
906 | ||
907 | static void ipmi_wdog_pretimeout_handler(void *handler_data) | |
908 | { | |
909 | if (preaction_val != WDOG_PRETIMEOUT_NONE) { | |
b385676b CM |
910 | if (preop_val == WDOG_PREOP_PANIC) { |
911 | if (atomic_inc_and_test(&preop_panic_excl)) | |
912 | panic("Watchdog pre-timeout"); | |
913 | } else if (preop_val == WDOG_PREOP_GIVE_DATA) { | |
1da177e4 LT |
914 | spin_lock(&ipmi_read_lock); |
915 | data_to_read = 1; | |
916 | wake_up_interruptible(&read_q); | |
917 | kill_fasync(&fasync_q, SIGIO, POLL_IN); | |
918 | ||
919 | spin_unlock(&ipmi_read_lock); | |
920 | } | |
921 | } | |
922 | ||
36c7dc44 CM |
923 | /* |
924 | * On some machines, the heartbeat will give an error and not | |
925 | * work unless we re-enable the timer. So do so. | |
926 | */ | |
1da177e4 LT |
927 | pretimeout_since_last_heartbeat = 1; |
928 | } | |
929 | ||
36c7dc44 | 930 | static struct ipmi_user_hndl ipmi_hndlrs = { |
1da177e4 LT |
931 | .ipmi_recv_hndl = ipmi_wdog_msg_handler, |
932 | .ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_handler | |
933 | }; | |
934 | ||
935 | static void ipmi_register_watchdog(int ipmi_intf) | |
936 | { | |
937 | int rv = -EBUSY; | |
938 | ||
1da177e4 LT |
939 | if (watchdog_user) |
940 | goto out; | |
941 | ||
b2c03941 CM |
942 | if ((ifnum_to_use >= 0) && (ifnum_to_use != ipmi_intf)) |
943 | goto out; | |
944 | ||
945 | watchdog_ifnum = ipmi_intf; | |
946 | ||
1da177e4 LT |
947 | rv = ipmi_create_user(ipmi_intf, &ipmi_hndlrs, NULL, &watchdog_user); |
948 | if (rv < 0) { | |
949 | printk(KERN_CRIT PFX "Unable to register with ipmi\n"); | |
950 | goto out; | |
951 | } | |
952 | ||
953 | ipmi_get_version(watchdog_user, | |
954 | &ipmi_version_major, | |
955 | &ipmi_version_minor); | |
956 | ||
957 | rv = misc_register(&ipmi_wdog_miscdev); | |
958 | if (rv < 0) { | |
959 | ipmi_destroy_user(watchdog_user); | |
960 | watchdog_user = NULL; | |
961 | printk(KERN_CRIT PFX "Unable to register misc device\n"); | |
962 | } | |
963 | ||
612b5a8d CM |
964 | #ifdef HAVE_DIE_NMI |
965 | if (nmi_handler_registered) { | |
966 | int old_pretimeout = pretimeout; | |
967 | int old_timeout = timeout; | |
968 | int old_preop_val = preop_val; | |
969 | ||
36c7dc44 CM |
970 | /* |
971 | * Set the pretimeout to go off in a second and give | |
972 | * ourselves plenty of time to stop the timer. | |
973 | */ | |
612b5a8d CM |
974 | ipmi_watchdog_state = WDOG_TIMEOUT_RESET; |
975 | preop_val = WDOG_PREOP_NONE; /* Make sure nothing happens */ | |
976 | pretimeout = 99; | |
977 | timeout = 100; | |
978 | ||
979 | testing_nmi = 1; | |
980 | ||
981 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
982 | if (rv) { | |
983 | printk(KERN_WARNING PFX "Error starting timer to" | |
984 | " test NMI: 0x%x. The NMI pretimeout will" | |
985 | " likely not work\n", rv); | |
986 | rv = 0; | |
987 | goto out_restore; | |
988 | } | |
989 | ||
990 | msleep(1500); | |
991 | ||
992 | if (testing_nmi != 2) { | |
993 | printk(KERN_WARNING PFX "IPMI NMI didn't seem to" | |
994 | " occur. The NMI pretimeout will" | |
995 | " likely not work\n"); | |
996 | } | |
36c7dc44 | 997 | out_restore: |
612b5a8d CM |
998 | testing_nmi = 0; |
999 | preop_val = old_preop_val; | |
1000 | pretimeout = old_pretimeout; | |
1001 | timeout = old_timeout; | |
1002 | } | |
1003 | #endif | |
1004 | ||
1da177e4 | 1005 | out: |
1da177e4 LT |
1006 | if ((start_now) && (rv == 0)) { |
1007 | /* Run from startup, so start the timer now. */ | |
1008 | start_now = 0; /* Disable this function after first startup. */ | |
1009 | ipmi_watchdog_state = action_val; | |
1010 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
1011 | printk(KERN_INFO PFX "Starting now!\n"); | |
612b5a8d CM |
1012 | } else { |
1013 | /* Stop the timer now. */ | |
1014 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
1015 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
1da177e4 LT |
1016 | } |
1017 | } | |
1018 | ||
b2c03941 CM |
1019 | static void ipmi_unregister_watchdog(int ipmi_intf) |
1020 | { | |
1021 | int rv; | |
1022 | ||
b2c03941 CM |
1023 | if (!watchdog_user) |
1024 | goto out; | |
1025 | ||
1026 | if (watchdog_ifnum != ipmi_intf) | |
1027 | goto out; | |
1028 | ||
1029 | /* Make sure no one can call us any more. */ | |
1030 | misc_deregister(&ipmi_wdog_miscdev); | |
1031 | ||
36c7dc44 CM |
1032 | /* |
1033 | * Wait to make sure the message makes it out. The lower layer has | |
1034 | * pointers to our buffers, we want to make sure they are done before | |
1035 | * we release our memory. | |
1036 | */ | |
b2c03941 CM |
1037 | while (atomic_read(&set_timeout_tofree)) |
1038 | schedule_timeout_uninterruptible(1); | |
1039 | ||
1040 | /* Disconnect from IPMI. */ | |
1041 | rv = ipmi_destroy_user(watchdog_user); | |
1042 | if (rv) { | |
1043 | printk(KERN_WARNING PFX "error unlinking from IPMI: %d\n", | |
1044 | rv); | |
1045 | } | |
1046 | watchdog_user = NULL; | |
1047 | ||
1048 | out: | |
f8fbcd3b | 1049 | return; |
b2c03941 CM |
1050 | } |
1051 | ||
612b5a8d | 1052 | #ifdef HAVE_DIE_NMI |
1da177e4 | 1053 | static int |
612b5a8d | 1054 | ipmi_nmi(struct notifier_block *self, unsigned long val, void *data) |
1da177e4 | 1055 | { |
612b5a8d CM |
1056 | struct die_args *args = data; |
1057 | ||
1058 | if (val != DIE_NMI) | |
1059 | return NOTIFY_OK; | |
1060 | ||
1061 | /* Hack, if it's a memory or I/O error, ignore it. */ | |
1062 | if (args->err & 0xc0) | |
1063 | return NOTIFY_OK; | |
1064 | ||
1065 | /* | |
1066 | * If we get here, it's an NMI that's not a memory or I/O | |
1067 | * error. We can't truly tell if it's from IPMI or not | |
1068 | * without sending a message, and sending a message is almost | |
1069 | * impossible because of locking. | |
1070 | */ | |
1071 | ||
1072 | if (testing_nmi) { | |
1073 | testing_nmi = 2; | |
1074 | return NOTIFY_STOP; | |
1075 | } | |
1076 | ||
36c7dc44 | 1077 | /* If we are not expecting a timeout, ignore it. */ |
8f05ee9a | 1078 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) |
612b5a8d CM |
1079 | return NOTIFY_OK; |
1080 | ||
1081 | if (preaction_val != WDOG_PRETIMEOUT_NMI) | |
1082 | return NOTIFY_OK; | |
8f05ee9a | 1083 | |
36c7dc44 CM |
1084 | /* |
1085 | * If no one else handled the NMI, we assume it was the IPMI | |
1086 | * watchdog. | |
1087 | */ | |
612b5a8d | 1088 | if (preop_val == WDOG_PREOP_PANIC) { |
8f05ee9a CM |
1089 | /* On some machines, the heartbeat will give |
1090 | an error and not work unless we re-enable | |
1091 | the timer. So do so. */ | |
1092 | pretimeout_since_last_heartbeat = 1; | |
b385676b CM |
1093 | if (atomic_inc_and_test(&preop_panic_excl)) |
1094 | panic(PFX "pre-timeout"); | |
8f05ee9a | 1095 | } |
1da177e4 | 1096 | |
612b5a8d | 1097 | return NOTIFY_STOP; |
1da177e4 LT |
1098 | } |
1099 | ||
612b5a8d CM |
1100 | static struct notifier_block ipmi_nmi_handler = { |
1101 | .notifier_call = ipmi_nmi | |
1da177e4 LT |
1102 | }; |
1103 | #endif | |
1104 | ||
1105 | static int wdog_reboot_handler(struct notifier_block *this, | |
1106 | unsigned long code, | |
1107 | void *unused) | |
1108 | { | |
36c7dc44 | 1109 | static int reboot_event_handled; |
1da177e4 LT |
1110 | |
1111 | if ((watchdog_user) && (!reboot_event_handled)) { | |
1112 | /* Make sure we only do this once. */ | |
1113 | reboot_event_handled = 1; | |
1114 | ||
fcfa4724 | 1115 | if (code == SYS_POWER_OFF || code == SYS_HALT) { |
1da177e4 LT |
1116 | /* Disable the WDT if we are shutting down. */ |
1117 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
1118 | panic_halt_ipmi_set_timeout(); | |
96febe9f | 1119 | } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { |
1da177e4 | 1120 | /* Set a long timer to let the reboot happens, but |
96febe9f CM |
1121 | reboot if it hangs, but only if the watchdog |
1122 | timer was already running. */ | |
1da177e4 LT |
1123 | timeout = 120; |
1124 | pretimeout = 0; | |
1125 | ipmi_watchdog_state = WDOG_TIMEOUT_RESET; | |
1126 | panic_halt_ipmi_set_timeout(); | |
1127 | } | |
1128 | } | |
1129 | return NOTIFY_OK; | |
1130 | } | |
1131 | ||
1132 | static struct notifier_block wdog_reboot_notifier = { | |
1133 | .notifier_call = wdog_reboot_handler, | |
1134 | .next = NULL, | |
1135 | .priority = 0 | |
1136 | }; | |
1137 | ||
1138 | static int wdog_panic_handler(struct notifier_block *this, | |
1139 | unsigned long event, | |
1140 | void *unused) | |
1141 | { | |
36c7dc44 | 1142 | static int panic_event_handled; |
1da177e4 | 1143 | |
96febe9f CM |
1144 | /* On a panic, if we have a panic timeout, make sure to extend |
1145 | the watchdog timer to a reasonable value to complete the | |
1146 | panic, if the watchdog timer is running. Plus the | |
1147 | pretimeout is meaningless at panic time. */ | |
1148 | if (watchdog_user && !panic_event_handled && | |
1149 | ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { | |
1150 | /* Make sure we do this only once. */ | |
1da177e4 | 1151 | panic_event_handled = 1; |
36c7dc44 | 1152 | |
1da177e4 LT |
1153 | timeout = 255; |
1154 | pretimeout = 0; | |
1da177e4 LT |
1155 | panic_halt_ipmi_set_timeout(); |
1156 | } | |
1157 | ||
1158 | return NOTIFY_OK; | |
1159 | } | |
1160 | ||
1161 | static struct notifier_block wdog_panic_notifier = { | |
1162 | .notifier_call = wdog_panic_handler, | |
1163 | .next = NULL, | |
1164 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
1165 | }; | |
1166 | ||
1167 | ||
50c812b2 | 1168 | static void ipmi_new_smi(int if_num, struct device *device) |
1da177e4 LT |
1169 | { |
1170 | ipmi_register_watchdog(if_num); | |
1171 | } | |
1172 | ||
1173 | static void ipmi_smi_gone(int if_num) | |
1174 | { | |
b2c03941 | 1175 | ipmi_unregister_watchdog(if_num); |
1da177e4 LT |
1176 | } |
1177 | ||
36c7dc44 | 1178 | static struct ipmi_smi_watcher smi_watcher = { |
1da177e4 LT |
1179 | .owner = THIS_MODULE, |
1180 | .new_smi = ipmi_new_smi, | |
1181 | .smi_gone = ipmi_smi_gone | |
1182 | }; | |
1183 | ||
cc4673ee | 1184 | static int action_op(const char *inval, char *outval) |
1da177e4 | 1185 | { |
cc4673ee CM |
1186 | if (outval) |
1187 | strcpy(outval, action); | |
1188 | ||
1189 | if (!inval) | |
1190 | return 0; | |
1da177e4 | 1191 | |
cc4673ee | 1192 | if (strcmp(inval, "reset") == 0) |
1da177e4 | 1193 | action_val = WDOG_TIMEOUT_RESET; |
cc4673ee | 1194 | else if (strcmp(inval, "none") == 0) |
1da177e4 | 1195 | action_val = WDOG_TIMEOUT_NONE; |
cc4673ee | 1196 | else if (strcmp(inval, "power_cycle") == 0) |
1da177e4 | 1197 | action_val = WDOG_TIMEOUT_POWER_CYCLE; |
cc4673ee | 1198 | else if (strcmp(inval, "power_off") == 0) |
1da177e4 | 1199 | action_val = WDOG_TIMEOUT_POWER_DOWN; |
cc4673ee CM |
1200 | else |
1201 | return -EINVAL; | |
1202 | strcpy(action, inval); | |
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | static int preaction_op(const char *inval, char *outval) | |
1207 | { | |
1208 | if (outval) | |
1209 | strcpy(outval, preaction); | |
1da177e4 | 1210 | |
cc4673ee CM |
1211 | if (!inval) |
1212 | return 0; | |
1213 | ||
1214 | if (strcmp(inval, "pre_none") == 0) | |
1da177e4 | 1215 | preaction_val = WDOG_PRETIMEOUT_NONE; |
cc4673ee | 1216 | else if (strcmp(inval, "pre_smi") == 0) |
1da177e4 | 1217 | preaction_val = WDOG_PRETIMEOUT_SMI; |
612b5a8d | 1218 | #ifdef HAVE_DIE_NMI |
cc4673ee | 1219 | else if (strcmp(inval, "pre_nmi") == 0) |
1da177e4 LT |
1220 | preaction_val = WDOG_PRETIMEOUT_NMI; |
1221 | #endif | |
cc4673ee | 1222 | else if (strcmp(inval, "pre_int") == 0) |
1da177e4 | 1223 | preaction_val = WDOG_PRETIMEOUT_MSG_INT; |
cc4673ee CM |
1224 | else |
1225 | return -EINVAL; | |
1226 | strcpy(preaction, inval); | |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | static int preop_op(const char *inval, char *outval) | |
1231 | { | |
1232 | if (outval) | |
1233 | strcpy(outval, preop); | |
1da177e4 | 1234 | |
cc4673ee CM |
1235 | if (!inval) |
1236 | return 0; | |
1237 | ||
1238 | if (strcmp(inval, "preop_none") == 0) | |
1da177e4 | 1239 | preop_val = WDOG_PREOP_NONE; |
cc4673ee | 1240 | else if (strcmp(inval, "preop_panic") == 0) |
1da177e4 | 1241 | preop_val = WDOG_PREOP_PANIC; |
cc4673ee | 1242 | else if (strcmp(inval, "preop_give_data") == 0) |
1da177e4 | 1243 | preop_val = WDOG_PREOP_GIVE_DATA; |
cc4673ee CM |
1244 | else |
1245 | return -EINVAL; | |
1246 | strcpy(preop, inval); | |
1247 | return 0; | |
1248 | } | |
1da177e4 | 1249 | |
cc4673ee CM |
1250 | static void check_parms(void) |
1251 | { | |
612b5a8d | 1252 | #ifdef HAVE_DIE_NMI |
cc4673ee CM |
1253 | int do_nmi = 0; |
1254 | int rv; | |
1255 | ||
1da177e4 | 1256 | if (preaction_val == WDOG_PRETIMEOUT_NMI) { |
cc4673ee | 1257 | do_nmi = 1; |
1da177e4 LT |
1258 | if (preop_val == WDOG_PREOP_GIVE_DATA) { |
1259 | printk(KERN_WARNING PFX "Pretimeout op is to give data" | |
1260 | " but NMI pretimeout is enabled, setting" | |
1261 | " pretimeout op to none\n"); | |
cc4673ee CM |
1262 | preop_op("preop_none", NULL); |
1263 | do_nmi = 0; | |
1da177e4 | 1264 | } |
cc4673ee CM |
1265 | } |
1266 | if (do_nmi && !nmi_handler_registered) { | |
612b5a8d | 1267 | rv = register_die_notifier(&ipmi_nmi_handler); |
1da177e4 | 1268 | if (rv) { |
cc4673ee CM |
1269 | printk(KERN_WARNING PFX |
1270 | "Can't register nmi handler\n"); | |
1271 | return; | |
1272 | } else | |
1273 | nmi_handler_registered = 1; | |
1274 | } else if (!do_nmi && nmi_handler_registered) { | |
612b5a8d | 1275 | unregister_die_notifier(&ipmi_nmi_handler); |
cc4673ee | 1276 | nmi_handler_registered = 0; |
1da177e4 LT |
1277 | } |
1278 | #endif | |
cc4673ee CM |
1279 | } |
1280 | ||
1281 | static int __init ipmi_wdog_init(void) | |
1282 | { | |
1283 | int rv; | |
1284 | ||
1285 | if (action_op(action, NULL)) { | |
1286 | action_op("reset", NULL); | |
1287 | printk(KERN_INFO PFX "Unknown action '%s', defaulting to" | |
1288 | " reset\n", action); | |
1289 | } | |
1290 | ||
1291 | if (preaction_op(preaction, NULL)) { | |
1292 | preaction_op("pre_none", NULL); | |
1293 | printk(KERN_INFO PFX "Unknown preaction '%s', defaulting to" | |
1294 | " none\n", preaction); | |
1295 | } | |
1296 | ||
1297 | if (preop_op(preop, NULL)) { | |
1298 | preop_op("preop_none", NULL); | |
1299 | printk(KERN_INFO PFX "Unknown preop '%s', defaulting to" | |
1300 | " none\n", preop); | |
1301 | } | |
1302 | ||
1303 | check_parms(); | |
1da177e4 | 1304 | |
b2c03941 CM |
1305 | register_reboot_notifier(&wdog_reboot_notifier); |
1306 | atomic_notifier_chain_register(&panic_notifier_list, | |
1307 | &wdog_panic_notifier); | |
1308 | ||
1da177e4 LT |
1309 | rv = ipmi_smi_watcher_register(&smi_watcher); |
1310 | if (rv) { | |
612b5a8d CM |
1311 | #ifdef HAVE_DIE_NMI |
1312 | if (nmi_handler_registered) | |
1313 | unregister_die_notifier(&ipmi_nmi_handler); | |
1da177e4 | 1314 | #endif |
b2c03941 CM |
1315 | atomic_notifier_chain_unregister(&panic_notifier_list, |
1316 | &wdog_panic_notifier); | |
1317 | unregister_reboot_notifier(&wdog_reboot_notifier); | |
1da177e4 LT |
1318 | printk(KERN_WARNING PFX "can't register smi watcher\n"); |
1319 | return rv; | |
1320 | } | |
1321 | ||
1fdd75bd CM |
1322 | printk(KERN_INFO PFX "driver initialized\n"); |
1323 | ||
1da177e4 LT |
1324 | return 0; |
1325 | } | |
1326 | ||
b2c03941 | 1327 | static void __exit ipmi_wdog_exit(void) |
1da177e4 | 1328 | { |
b2c03941 CM |
1329 | ipmi_smi_watcher_unregister(&smi_watcher); |
1330 | ipmi_unregister_watchdog(watchdog_ifnum); | |
1da177e4 | 1331 | |
612b5a8d | 1332 | #ifdef HAVE_DIE_NMI |
cc4673ee | 1333 | if (nmi_handler_registered) |
612b5a8d | 1334 | unregister_die_notifier(&ipmi_nmi_handler); |
1da177e4 LT |
1335 | #endif |
1336 | ||
e041c683 | 1337 | atomic_notifier_chain_unregister(&panic_notifier_list, |
b2c03941 | 1338 | &wdog_panic_notifier); |
1da177e4 | 1339 | unregister_reboot_notifier(&wdog_reboot_notifier); |
1da177e4 LT |
1340 | } |
1341 | module_exit(ipmi_wdog_exit); | |
1342 | module_init(ipmi_wdog_init); | |
1343 | MODULE_LICENSE("GPL"); | |
1fdd75bd CM |
1344 | MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); |
1345 | MODULE_DESCRIPTION("watchdog timer based upon the IPMI interface."); |