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> | |
609146fd | 38 | #include <linux/mutex.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> |
60063497 | 55 | #include <linux/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 | 67 | #include <asm/kdebug.h> |
9c48f1c6 | 68 | #include <asm/nmi.h> |
612b5a8d | 69 | #define HAVE_DIE_NMI |
1da177e4 LT |
70 | #endif |
71 | ||
72 | #define PFX "IPMI Watchdog: " | |
73 | ||
1da177e4 LT |
74 | /* |
75 | * The IPMI command/response information for the watchdog timer. | |
76 | */ | |
77 | ||
78 | /* values for byte 1 of the set command, byte 2 of the get response. */ | |
79 | #define WDOG_DONT_LOG (1 << 7) | |
80 | #define WDOG_DONT_STOP_ON_SET (1 << 6) | |
81 | #define WDOG_SET_TIMER_USE(byte, use) \ | |
82 | byte = ((byte) & 0xf8) | ((use) & 0x7) | |
83 | #define WDOG_GET_TIMER_USE(byte) ((byte) & 0x7) | |
84 | #define WDOG_TIMER_USE_BIOS_FRB2 1 | |
85 | #define WDOG_TIMER_USE_BIOS_POST 2 | |
86 | #define WDOG_TIMER_USE_OS_LOAD 3 | |
87 | #define WDOG_TIMER_USE_SMS_OS 4 | |
88 | #define WDOG_TIMER_USE_OEM 5 | |
89 | ||
90 | /* values for byte 2 of the set command, byte 3 of the get response. */ | |
91 | #define WDOG_SET_PRETIMEOUT_ACT(byte, use) \ | |
92 | byte = ((byte) & 0x8f) | (((use) & 0x7) << 4) | |
93 | #define WDOG_GET_PRETIMEOUT_ACT(byte) (((byte) >> 4) & 0x7) | |
94 | #define WDOG_PRETIMEOUT_NONE 0 | |
95 | #define WDOG_PRETIMEOUT_SMI 1 | |
96 | #define WDOG_PRETIMEOUT_NMI 2 | |
97 | #define WDOG_PRETIMEOUT_MSG_INT 3 | |
98 | ||
99 | /* Operations that can be performed on a pretimout. */ | |
100 | #define WDOG_PREOP_NONE 0 | |
101 | #define WDOG_PREOP_PANIC 1 | |
36c7dc44 CM |
102 | /* Cause data to be available to read. Doesn't work in NMI mode. */ |
103 | #define WDOG_PREOP_GIVE_DATA 2 | |
1da177e4 LT |
104 | |
105 | /* Actions to perform on a full timeout. */ | |
106 | #define WDOG_SET_TIMEOUT_ACT(byte, use) \ | |
107 | byte = ((byte) & 0xf8) | ((use) & 0x7) | |
108 | #define WDOG_GET_TIMEOUT_ACT(byte) ((byte) & 0x7) | |
109 | #define WDOG_TIMEOUT_NONE 0 | |
110 | #define WDOG_TIMEOUT_RESET 1 | |
111 | #define WDOG_TIMEOUT_POWER_DOWN 2 | |
112 | #define WDOG_TIMEOUT_POWER_CYCLE 3 | |
113 | ||
36c7dc44 CM |
114 | /* |
115 | * Byte 3 of the get command, byte 4 of the get response is the | |
116 | * pre-timeout in seconds. | |
117 | */ | |
1da177e4 LT |
118 | |
119 | /* Bits for setting byte 4 of the set command, byte 5 of the get response. */ | |
120 | #define WDOG_EXPIRE_CLEAR_BIOS_FRB2 (1 << 1) | |
121 | #define WDOG_EXPIRE_CLEAR_BIOS_POST (1 << 2) | |
122 | #define WDOG_EXPIRE_CLEAR_OS_LOAD (1 << 3) | |
123 | #define WDOG_EXPIRE_CLEAR_SMS_OS (1 << 4) | |
124 | #define WDOG_EXPIRE_CLEAR_OEM (1 << 5) | |
125 | ||
36c7dc44 CM |
126 | /* |
127 | * Setting/getting the watchdog timer value. This is for bytes 5 and | |
128 | * 6 (the timeout time) of the set command, and bytes 6 and 7 (the | |
129 | * timeout time) and 8 and 9 (the current countdown value) of the | |
130 | * response. The timeout value is given in seconds (in the command it | |
131 | * is 100ms intervals). | |
132 | */ | |
1da177e4 LT |
133 | #define WDOG_SET_TIMEOUT(byte1, byte2, val) \ |
134 | (byte1) = (((val) * 10) & 0xff), (byte2) = (((val) * 10) >> 8) | |
135 | #define WDOG_GET_TIMEOUT(byte1, byte2) \ | |
136 | (((byte1) | ((byte2) << 8)) / 10) | |
137 | ||
138 | #define IPMI_WDOG_RESET_TIMER 0x22 | |
139 | #define IPMI_WDOG_SET_TIMER 0x24 | |
140 | #define IPMI_WDOG_GET_TIMER 0x25 | |
141 | ||
142 | /* These are here until the real ones get into the watchdog.h interface. */ | |
143 | #ifndef WDIOC_GETTIMEOUT | |
144 | #define WDIOC_GETTIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 20, int) | |
145 | #endif | |
146 | #ifndef WDIOC_SET_PRETIMEOUT | |
147 | #define WDIOC_SET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 21, int) | |
148 | #endif | |
149 | #ifndef WDIOC_GET_PRETIMEOUT | |
150 | #define WDIOC_GET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 22, int) | |
151 | #endif | |
152 | ||
609146fd | 153 | static DEFINE_MUTEX(ipmi_watchdog_mutex); |
4bfdf378 | 154 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 155 | |
0c8204b3 | 156 | static ipmi_user_t watchdog_user; |
b2c03941 | 157 | static int watchdog_ifnum; |
1da177e4 LT |
158 | |
159 | /* Default the timeout to 10 seconds. */ | |
160 | static int timeout = 10; | |
161 | ||
162 | /* The pre-timeout is disabled by default. */ | |
0c8204b3 | 163 | static int pretimeout; |
1da177e4 LT |
164 | |
165 | /* Default action is to reset the board on a timeout. */ | |
166 | static unsigned char action_val = WDOG_TIMEOUT_RESET; | |
167 | ||
168 | static char action[16] = "reset"; | |
169 | ||
170 | static unsigned char preaction_val = WDOG_PRETIMEOUT_NONE; | |
171 | ||
172 | static char preaction[16] = "pre_none"; | |
173 | ||
174 | static unsigned char preop_val = WDOG_PREOP_NONE; | |
175 | ||
176 | static char preop[16] = "preop_none"; | |
177 | static DEFINE_SPINLOCK(ipmi_read_lock); | |
0c8204b3 | 178 | static char data_to_read; |
1da177e4 | 179 | static DECLARE_WAIT_QUEUE_HEAD(read_q); |
0c8204b3 RD |
180 | static struct fasync_struct *fasync_q; |
181 | static char pretimeout_since_last_heartbeat; | |
1da177e4 LT |
182 | static char expect_close; |
183 | ||
b2c03941 CM |
184 | static int ifnum_to_use = -1; |
185 | ||
cc4673ee CM |
186 | /* Parameters to ipmi_set_timeout */ |
187 | #define IPMI_SET_TIMEOUT_NO_HB 0 | |
188 | #define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1 | |
189 | #define IPMI_SET_TIMEOUT_FORCE_HB 2 | |
190 | ||
191 | static int ipmi_set_timeout(int do_heartbeat); | |
b2c03941 CM |
192 | static void ipmi_register_watchdog(int ipmi_intf); |
193 | static void ipmi_unregister_watchdog(int ipmi_intf); | |
cc4673ee | 194 | |
36c7dc44 CM |
195 | /* |
196 | * If true, the driver will start running as soon as it is configured | |
197 | * and ready. | |
198 | */ | |
0c8204b3 | 199 | static int start_now; |
1da177e4 | 200 | |
c8ba6c52 | 201 | static int set_param_timeout(const char *val, const struct kernel_param *kp) |
cc4673ee CM |
202 | { |
203 | char *endp; | |
204 | int l; | |
205 | int rv = 0; | |
206 | ||
207 | if (!val) | |
208 | return -EINVAL; | |
209 | l = simple_strtoul(val, &endp, 0); | |
210 | if (endp == val) | |
211 | return -EINVAL; | |
212 | ||
cc4673ee CM |
213 | *((int *)kp->arg) = l; |
214 | if (watchdog_user) | |
215 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
cc4673ee CM |
216 | |
217 | return rv; | |
218 | } | |
219 | ||
c8ba6c52 RR |
220 | static struct kernel_param_ops param_ops_timeout = { |
221 | .set = set_param_timeout, | |
222 | .get = param_get_int, | |
223 | }; | |
224 | #define param_check_timeout param_check_int | |
cc4673ee CM |
225 | |
226 | typedef int (*action_fn)(const char *intval, char *outval); | |
227 | ||
228 | static int action_op(const char *inval, char *outval); | |
229 | static int preaction_op(const char *inval, char *outval); | |
230 | static int preop_op(const char *inval, char *outval); | |
231 | static void check_parms(void); | |
232 | ||
c8ba6c52 | 233 | static int set_param_str(const char *val, const struct kernel_param *kp) |
cc4673ee CM |
234 | { |
235 | action_fn fn = (action_fn) kp->arg; | |
236 | int rv = 0; | |
43cdff92 SD |
237 | char valcp[16]; |
238 | char *s; | |
66f969d0 | 239 | |
43cdff92 SD |
240 | strncpy(valcp, val, 16); |
241 | valcp[15] = '\0'; | |
66f969d0 | 242 | |
43cdff92 | 243 | s = strstrip(valcp); |
cc4673ee | 244 | |
66f969d0 | 245 | rv = fn(s, NULL); |
cc4673ee | 246 | if (rv) |
f8fbcd3b | 247 | goto out; |
cc4673ee CM |
248 | |
249 | check_parms(); | |
250 | if (watchdog_user) | |
251 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
252 | ||
f8fbcd3b | 253 | out: |
cc4673ee CM |
254 | return rv; |
255 | } | |
256 | ||
c8ba6c52 | 257 | static int get_param_str(char *buffer, const struct kernel_param *kp) |
cc4673ee CM |
258 | { |
259 | action_fn fn = (action_fn) kp->arg; | |
260 | int rv; | |
261 | ||
262 | rv = fn(NULL, buffer); | |
263 | if (rv) | |
264 | return rv; | |
265 | return strlen(buffer); | |
266 | } | |
267 | ||
b2c03941 | 268 | |
c8ba6c52 | 269 | static int set_param_wdog_ifnum(const char *val, const struct kernel_param *kp) |
b2c03941 CM |
270 | { |
271 | int rv = param_set_int(val, kp); | |
272 | if (rv) | |
273 | return rv; | |
274 | if ((ifnum_to_use < 0) || (ifnum_to_use == watchdog_ifnum)) | |
275 | return 0; | |
276 | ||
277 | ipmi_unregister_watchdog(watchdog_ifnum); | |
278 | ipmi_register_watchdog(ifnum_to_use); | |
279 | return 0; | |
280 | } | |
281 | ||
c8ba6c52 RR |
282 | static struct kernel_param_ops param_ops_wdog_ifnum = { |
283 | .set = set_param_wdog_ifnum, | |
284 | .get = param_get_int, | |
285 | }; | |
286 | ||
287 | #define param_check_wdog_ifnum param_check_int | |
288 | ||
289 | static struct kernel_param_ops param_ops_str = { | |
290 | .set = set_param_str, | |
291 | .get = get_param_str, | |
292 | }; | |
293 | ||
294 | module_param(ifnum_to_use, wdog_ifnum, 0644); | |
b2c03941 CM |
295 | MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog " |
296 | "timer. Setting to -1 defaults to the first registered " | |
297 | "interface"); | |
298 | ||
c8ba6c52 | 299 | module_param(timeout, timeout, 0644); |
1da177e4 | 300 | MODULE_PARM_DESC(timeout, "Timeout value in seconds."); |
cc4673ee | 301 | |
c8ba6c52 | 302 | module_param(pretimeout, timeout, 0644); |
1da177e4 | 303 | MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds."); |
cc4673ee | 304 | |
c8ba6c52 | 305 | module_param_cb(action, ¶m_ops_str, action_op, 0644); |
1da177e4 LT |
306 | MODULE_PARM_DESC(action, "Timeout action. One of: " |
307 | "reset, none, power_cycle, power_off."); | |
cc4673ee | 308 | |
c8ba6c52 | 309 | module_param_cb(preaction, ¶m_ops_str, preaction_op, 0644); |
1da177e4 LT |
310 | MODULE_PARM_DESC(preaction, "Pretimeout action. One of: " |
311 | "pre_none, pre_smi, pre_nmi, pre_int."); | |
cc4673ee | 312 | |
c8ba6c52 | 313 | module_param_cb(preop, ¶m_ops_str, preop_op, 0644); |
1da177e4 LT |
314 | MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: " |
315 | "preop_none, preop_panic, preop_give_data."); | |
cc4673ee | 316 | |
b2c03941 | 317 | module_param(start_now, int, 0444); |
1da177e4 LT |
318 | MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as" |
319 | "soon as the driver is loaded."); | |
cc4673ee CM |
320 | |
321 | module_param(nowayout, int, 0644); | |
b2c03941 CM |
322 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " |
323 | "(default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
1da177e4 LT |
324 | |
325 | /* Default state of the timer. */ | |
326 | static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
327 | ||
328 | /* If shutting down via IPMI, we ignore the heartbeat. */ | |
0c8204b3 | 329 | static int ipmi_ignore_heartbeat; |
1da177e4 LT |
330 | |
331 | /* Is someone using the watchdog? Only one user is allowed. */ | |
0c8204b3 | 332 | static unsigned long ipmi_wdog_open; |
1da177e4 | 333 | |
36c7dc44 CM |
334 | /* |
335 | * If set to 1, the heartbeat command will set the state to reset and | |
336 | * start the timer. The timer doesn't normally run when the driver is | |
337 | * first opened until the heartbeat is set the first time, this | |
338 | * variable is used to accomplish this. | |
339 | */ | |
0c8204b3 | 340 | static int ipmi_start_timer_on_heartbeat; |
1da177e4 LT |
341 | |
342 | /* IPMI version of the BMC. */ | |
343 | static unsigned char ipmi_version_major; | |
344 | static unsigned char ipmi_version_minor; | |
345 | ||
b385676b CM |
346 | /* If a pretimeout occurs, this is used to allow only one panic to happen. */ |
347 | static atomic_t preop_panic_excl = ATOMIC_INIT(-1); | |
1da177e4 | 348 | |
612b5a8d CM |
349 | #ifdef HAVE_DIE_NMI |
350 | static int testing_nmi; | |
351 | static int nmi_handler_registered; | |
352 | #endif | |
353 | ||
1da177e4 | 354 | static int ipmi_heartbeat(void); |
1da177e4 | 355 | |
36c7dc44 CM |
356 | /* |
357 | * We use a mutex to make sure that only one thing can send a set | |
358 | * timeout at one time, because we only have one copy of the data. | |
359 | * The mutex is claimed when the set_timeout is sent and freed | |
360 | * when both messages are free. | |
361 | */ | |
1da177e4 | 362 | static atomic_t set_timeout_tofree = ATOMIC_INIT(0); |
d6dfd131 CM |
363 | static DEFINE_MUTEX(set_timeout_lock); |
364 | static DECLARE_COMPLETION(set_timeout_wait); | |
1da177e4 LT |
365 | static void set_timeout_free_smi(struct ipmi_smi_msg *msg) |
366 | { | |
367 | if (atomic_dec_and_test(&set_timeout_tofree)) | |
d6dfd131 | 368 | complete(&set_timeout_wait); |
1da177e4 LT |
369 | } |
370 | static void set_timeout_free_recv(struct ipmi_recv_msg *msg) | |
371 | { | |
372 | if (atomic_dec_and_test(&set_timeout_tofree)) | |
d6dfd131 | 373 | complete(&set_timeout_wait); |
1da177e4 | 374 | } |
36c7dc44 | 375 | static struct ipmi_smi_msg set_timeout_smi_msg = { |
1da177e4 LT |
376 | .done = set_timeout_free_smi |
377 | }; | |
36c7dc44 | 378 | static struct ipmi_recv_msg set_timeout_recv_msg = { |
1da177e4 LT |
379 | .done = set_timeout_free_recv |
380 | }; | |
36c7dc44 | 381 | |
1da177e4 LT |
382 | static int i_ipmi_set_timeout(struct ipmi_smi_msg *smi_msg, |
383 | struct ipmi_recv_msg *recv_msg, | |
384 | int *send_heartbeat_now) | |
385 | { | |
386 | struct kernel_ipmi_msg msg; | |
387 | unsigned char data[6]; | |
388 | int rv; | |
389 | struct ipmi_system_interface_addr addr; | |
390 | int hbnow = 0; | |
391 | ||
392 | ||
612b5a8d CM |
393 | /* These can be cleared as we are setting the timeout. */ |
394 | pretimeout_since_last_heartbeat = 0; | |
395 | ||
1da177e4 LT |
396 | data[0] = 0; |
397 | WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS); | |
398 | ||
399 | if ((ipmi_version_major > 1) | |
36c7dc44 | 400 | || ((ipmi_version_major == 1) && (ipmi_version_minor >= 5))) { |
1da177e4 LT |
401 | /* This is an IPMI 1.5-only feature. */ |
402 | data[0] |= WDOG_DONT_STOP_ON_SET; | |
403 | } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { | |
36c7dc44 CM |
404 | /* |
405 | * In ipmi 1.0, setting the timer stops the watchdog, we | |
406 | * need to start it back up again. | |
407 | */ | |
1da177e4 LT |
408 | hbnow = 1; |
409 | } | |
410 | ||
411 | data[1] = 0; | |
412 | WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state); | |
8f05ee9a | 413 | if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) { |
1da177e4 LT |
414 | WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val); |
415 | data[2] = pretimeout; | |
416 | } else { | |
417 | WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE); | |
418 | data[2] = 0; /* No pretimeout. */ | |
419 | } | |
420 | data[3] = 0; | |
421 | WDOG_SET_TIMEOUT(data[4], data[5], timeout); | |
422 | ||
423 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
424 | addr.channel = IPMI_BMC_CHANNEL; | |
425 | addr.lun = 0; | |
426 | ||
427 | msg.netfn = 0x06; | |
428 | msg.cmd = IPMI_WDOG_SET_TIMER; | |
429 | msg.data = data; | |
430 | msg.data_len = sizeof(data); | |
431 | rv = ipmi_request_supply_msgs(watchdog_user, | |
432 | (struct ipmi_addr *) &addr, | |
433 | 0, | |
434 | &msg, | |
435 | NULL, | |
436 | smi_msg, | |
437 | recv_msg, | |
438 | 1); | |
439 | if (rv) { | |
440 | printk(KERN_WARNING PFX "set timeout error: %d\n", | |
441 | rv); | |
442 | } | |
443 | ||
444 | if (send_heartbeat_now) | |
445 | *send_heartbeat_now = hbnow; | |
446 | ||
447 | return rv; | |
448 | } | |
449 | ||
1da177e4 LT |
450 | static int ipmi_set_timeout(int do_heartbeat) |
451 | { | |
452 | int send_heartbeat_now; | |
453 | int rv; | |
454 | ||
455 | ||
456 | /* We can only send one of these at a time. */ | |
d6dfd131 | 457 | mutex_lock(&set_timeout_lock); |
1da177e4 LT |
458 | |
459 | atomic_set(&set_timeout_tofree, 2); | |
460 | ||
461 | rv = i_ipmi_set_timeout(&set_timeout_smi_msg, | |
462 | &set_timeout_recv_msg, | |
463 | &send_heartbeat_now); | |
464 | if (rv) { | |
d6dfd131 CM |
465 | mutex_unlock(&set_timeout_lock); |
466 | goto out; | |
467 | } | |
468 | ||
469 | wait_for_completion(&set_timeout_wait); | |
470 | ||
612b5a8d CM |
471 | mutex_unlock(&set_timeout_lock); |
472 | ||
d6dfd131 CM |
473 | if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB) |
474 | || ((send_heartbeat_now) | |
475 | && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY))) | |
d6dfd131 | 476 | rv = ipmi_heartbeat(); |
1da177e4 | 477 | |
d6dfd131 | 478 | out: |
1da177e4 LT |
479 | return rv; |
480 | } | |
481 | ||
fcfa4724 CM |
482 | static atomic_t panic_done_count = ATOMIC_INIT(0); |
483 | ||
484 | static void panic_smi_free(struct ipmi_smi_msg *msg) | |
1da177e4 | 485 | { |
fcfa4724 | 486 | atomic_dec(&panic_done_count); |
1da177e4 | 487 | } |
fcfa4724 CM |
488 | static void panic_recv_free(struct ipmi_recv_msg *msg) |
489 | { | |
490 | atomic_dec(&panic_done_count); | |
491 | } | |
492 | ||
36c7dc44 | 493 | static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = { |
fcfa4724 CM |
494 | .done = panic_smi_free |
495 | }; | |
36c7dc44 | 496 | static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = { |
fcfa4724 CM |
497 | .done = panic_recv_free |
498 | }; | |
499 | ||
500 | static void panic_halt_ipmi_heartbeat(void) | |
501 | { | |
502 | struct kernel_ipmi_msg msg; | |
503 | struct ipmi_system_interface_addr addr; | |
504 | int rv; | |
505 | ||
36c7dc44 CM |
506 | /* |
507 | * Don't reset the timer if we have the timer turned off, that | |
508 | * re-enables the watchdog. | |
509 | */ | |
fcfa4724 CM |
510 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) |
511 | return; | |
512 | ||
513 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
514 | addr.channel = IPMI_BMC_CHANNEL; | |
515 | addr.lun = 0; | |
516 | ||
517 | msg.netfn = 0x06; | |
518 | msg.cmd = IPMI_WDOG_RESET_TIMER; | |
519 | msg.data = NULL; | |
520 | msg.data_len = 0; | |
521 | rv = ipmi_request_supply_msgs(watchdog_user, | |
522 | (struct ipmi_addr *) &addr, | |
523 | 0, | |
524 | &msg, | |
525 | NULL, | |
526 | &panic_halt_heartbeat_smi_msg, | |
527 | &panic_halt_heartbeat_recv_msg, | |
528 | 1); | |
529 | if (!rv) | |
530 | atomic_add(2, &panic_done_count); | |
1da177e4 | 531 | } |
fcfa4724 | 532 | |
36c7dc44 | 533 | static struct ipmi_smi_msg panic_halt_smi_msg = { |
fcfa4724 | 534 | .done = panic_smi_free |
1da177e4 | 535 | }; |
36c7dc44 | 536 | static struct ipmi_recv_msg panic_halt_recv_msg = { |
fcfa4724 | 537 | .done = panic_recv_free |
1da177e4 LT |
538 | }; |
539 | ||
36c7dc44 CM |
540 | /* |
541 | * Special call, doesn't claim any locks. This is only to be called | |
542 | * at panic or halt time, in run-to-completion mode, when the caller | |
543 | * is the only CPU and the only thing that will be going is these IPMI | |
544 | * calls. | |
545 | */ | |
1da177e4 LT |
546 | static void panic_halt_ipmi_set_timeout(void) |
547 | { | |
548 | int send_heartbeat_now; | |
549 | int rv; | |
550 | ||
fcfa4724 CM |
551 | /* Wait for the messages to be free. */ |
552 | while (atomic_read(&panic_done_count) != 0) | |
553 | ipmi_poll_interface(watchdog_user); | |
1da177e4 LT |
554 | rv = i_ipmi_set_timeout(&panic_halt_smi_msg, |
555 | &panic_halt_recv_msg, | |
556 | &send_heartbeat_now); | |
557 | if (!rv) { | |
fcfa4724 | 558 | atomic_add(2, &panic_done_count); |
1da177e4 LT |
559 | if (send_heartbeat_now) |
560 | panic_halt_ipmi_heartbeat(); | |
fcfa4724 CM |
561 | } else |
562 | printk(KERN_WARNING PFX | |
563 | "Unable to extend the watchdog timeout."); | |
564 | while (atomic_read(&panic_done_count) != 0) | |
565 | ipmi_poll_interface(watchdog_user); | |
1da177e4 LT |
566 | } |
567 | ||
36c7dc44 CM |
568 | /* |
569 | * We use a mutex to make sure that only one thing can send a | |
570 | * heartbeat at one time, because we only have one copy of the data. | |
571 | * The semaphore is claimed when the set_timeout is sent and freed | |
572 | * when both messages are free. | |
573 | */ | |
1da177e4 | 574 | static atomic_t heartbeat_tofree = ATOMIC_INIT(0); |
d6dfd131 CM |
575 | static DEFINE_MUTEX(heartbeat_lock); |
576 | static DECLARE_COMPLETION(heartbeat_wait); | |
1da177e4 LT |
577 | static void heartbeat_free_smi(struct ipmi_smi_msg *msg) |
578 | { | |
579 | if (atomic_dec_and_test(&heartbeat_tofree)) | |
d6dfd131 | 580 | complete(&heartbeat_wait); |
1da177e4 LT |
581 | } |
582 | static void heartbeat_free_recv(struct ipmi_recv_msg *msg) | |
583 | { | |
584 | if (atomic_dec_and_test(&heartbeat_tofree)) | |
d6dfd131 | 585 | complete(&heartbeat_wait); |
1da177e4 | 586 | } |
36c7dc44 | 587 | static struct ipmi_smi_msg heartbeat_smi_msg = { |
1da177e4 LT |
588 | .done = heartbeat_free_smi |
589 | }; | |
36c7dc44 | 590 | static struct ipmi_recv_msg heartbeat_recv_msg = { |
1da177e4 LT |
591 | .done = heartbeat_free_recv |
592 | }; | |
36c7dc44 | 593 | |
1da177e4 LT |
594 | static int ipmi_heartbeat(void) |
595 | { | |
596 | struct kernel_ipmi_msg msg; | |
597 | int rv; | |
598 | struct ipmi_system_interface_addr addr; | |
599 | ||
612b5a8d | 600 | if (ipmi_ignore_heartbeat) |
1da177e4 | 601 | return 0; |
1da177e4 LT |
602 | |
603 | if (ipmi_start_timer_on_heartbeat) { | |
faa8b6c3 | 604 | ipmi_start_timer_on_heartbeat = 0; |
1da177e4 LT |
605 | ipmi_watchdog_state = action_val; |
606 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
607 | } else if (pretimeout_since_last_heartbeat) { | |
36c7dc44 CM |
608 | /* |
609 | * A pretimeout occurred, make sure we set the timeout. | |
610 | * We don't want to set the action, though, we want to | |
611 | * leave that alone (thus it can't be combined with the | |
612 | * above operation. | |
613 | */ | |
1da177e4 LT |
614 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
615 | } | |
616 | ||
d6dfd131 | 617 | mutex_lock(&heartbeat_lock); |
1da177e4 LT |
618 | |
619 | atomic_set(&heartbeat_tofree, 2); | |
620 | ||
36c7dc44 CM |
621 | /* |
622 | * Don't reset the timer if we have the timer turned off, that | |
623 | * re-enables the watchdog. | |
624 | */ | |
1da177e4 | 625 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) { |
d6dfd131 | 626 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
627 | return 0; |
628 | } | |
629 | ||
630 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
631 | addr.channel = IPMI_BMC_CHANNEL; | |
632 | addr.lun = 0; | |
633 | ||
634 | msg.netfn = 0x06; | |
635 | msg.cmd = IPMI_WDOG_RESET_TIMER; | |
636 | msg.data = NULL; | |
637 | msg.data_len = 0; | |
638 | rv = ipmi_request_supply_msgs(watchdog_user, | |
639 | (struct ipmi_addr *) &addr, | |
640 | 0, | |
641 | &msg, | |
642 | NULL, | |
643 | &heartbeat_smi_msg, | |
644 | &heartbeat_recv_msg, | |
645 | 1); | |
646 | if (rv) { | |
d6dfd131 | 647 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
648 | printk(KERN_WARNING PFX "heartbeat failure: %d\n", |
649 | rv); | |
650 | return rv; | |
651 | } | |
652 | ||
653 | /* Wait for the heartbeat to be sent. */ | |
d6dfd131 | 654 | wait_for_completion(&heartbeat_wait); |
1da177e4 LT |
655 | |
656 | if (heartbeat_recv_msg.msg.data[0] != 0) { | |
36c7dc44 CM |
657 | /* |
658 | * Got an error in the heartbeat response. It was already | |
659 | * reported in ipmi_wdog_msg_handler, but we should return | |
660 | * an error here. | |
661 | */ | |
662 | rv = -EINVAL; | |
1da177e4 LT |
663 | } |
664 | ||
d6dfd131 | 665 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
666 | |
667 | return rv; | |
668 | } | |
669 | ||
36c7dc44 | 670 | static struct watchdog_info ident = { |
1da177e4 LT |
671 | .options = 0, /* WDIOF_SETTIMEOUT, */ |
672 | .firmware_version = 1, | |
673 | .identity = "IPMI" | |
674 | }; | |
675 | ||
55929332 | 676 | static int ipmi_ioctl(struct file *file, |
1da177e4 LT |
677 | unsigned int cmd, unsigned long arg) |
678 | { | |
679 | void __user *argp = (void __user *)arg; | |
680 | int i; | |
681 | int val; | |
682 | ||
36c7dc44 | 683 | switch (cmd) { |
1da177e4 LT |
684 | case WDIOC_GETSUPPORT: |
685 | i = copy_to_user(argp, &ident, sizeof(ident)); | |
686 | return i ? -EFAULT : 0; | |
687 | ||
688 | case WDIOC_SETTIMEOUT: | |
689 | i = copy_from_user(&val, argp, sizeof(int)); | |
690 | if (i) | |
691 | return -EFAULT; | |
692 | timeout = val; | |
693 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
694 | ||
695 | case WDIOC_GETTIMEOUT: | |
696 | i = copy_to_user(argp, &timeout, sizeof(timeout)); | |
697 | if (i) | |
698 | return -EFAULT; | |
699 | return 0; | |
700 | ||
701 | case WDIOC_SET_PRETIMEOUT: | |
783e6bcd | 702 | case WDIOC_SETPRETIMEOUT: |
1da177e4 LT |
703 | i = copy_from_user(&val, argp, sizeof(int)); |
704 | if (i) | |
705 | return -EFAULT; | |
706 | pretimeout = val; | |
707 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
708 | ||
709 | case WDIOC_GET_PRETIMEOUT: | |
783e6bcd | 710 | case WDIOC_GETPRETIMEOUT: |
1da177e4 LT |
711 | i = copy_to_user(argp, &pretimeout, sizeof(pretimeout)); |
712 | if (i) | |
713 | return -EFAULT; | |
714 | return 0; | |
715 | ||
716 | case WDIOC_KEEPALIVE: | |
717 | return ipmi_heartbeat(); | |
718 | ||
719 | case WDIOC_SETOPTIONS: | |
720 | i = copy_from_user(&val, argp, sizeof(int)); | |
721 | if (i) | |
722 | return -EFAULT; | |
36c7dc44 | 723 | if (val & WDIOS_DISABLECARD) { |
1da177e4 LT |
724 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
725 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
726 | ipmi_start_timer_on_heartbeat = 0; | |
727 | } | |
728 | ||
36c7dc44 | 729 | if (val & WDIOS_ENABLECARD) { |
1da177e4 LT |
730 | ipmi_watchdog_state = action_val; |
731 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
732 | } | |
733 | return 0; | |
734 | ||
735 | case WDIOC_GETSTATUS: | |
736 | val = 0; | |
737 | i = copy_to_user(argp, &val, sizeof(val)); | |
738 | if (i) | |
739 | return -EFAULT; | |
740 | return 0; | |
741 | ||
742 | default: | |
743 | return -ENOIOCTLCMD; | |
744 | } | |
745 | } | |
746 | ||
55929332 AB |
747 | static long ipmi_unlocked_ioctl(struct file *file, |
748 | unsigned int cmd, | |
749 | unsigned long arg) | |
750 | { | |
751 | int ret; | |
752 | ||
609146fd | 753 | mutex_lock(&ipmi_watchdog_mutex); |
55929332 | 754 | ret = ipmi_ioctl(file, cmd, arg); |
609146fd | 755 | mutex_unlock(&ipmi_watchdog_mutex); |
55929332 AB |
756 | |
757 | return ret; | |
758 | } | |
759 | ||
1da177e4 LT |
760 | static ssize_t ipmi_write(struct file *file, |
761 | const char __user *buf, | |
762 | size_t len, | |
763 | loff_t *ppos) | |
764 | { | |
765 | int rv; | |
766 | ||
767 | if (len) { | |
36c7dc44 CM |
768 | if (!nowayout) { |
769 | size_t i; | |
1da177e4 LT |
770 | |
771 | /* In case it was set long ago */ | |
772 | expect_close = 0; | |
773 | ||
36c7dc44 | 774 | for (i = 0; i != len; i++) { |
1da177e4 LT |
775 | char c; |
776 | ||
777 | if (get_user(c, buf + i)) | |
778 | return -EFAULT; | |
779 | if (c == 'V') | |
780 | expect_close = 42; | |
781 | } | |
782 | } | |
783 | rv = ipmi_heartbeat(); | |
784 | if (rv) | |
785 | return rv; | |
1da177e4 | 786 | } |
3976df9b | 787 | return len; |
1da177e4 LT |
788 | } |
789 | ||
790 | static ssize_t ipmi_read(struct file *file, | |
791 | char __user *buf, | |
792 | size_t count, | |
793 | loff_t *ppos) | |
794 | { | |
795 | int rv = 0; | |
796 | wait_queue_t wait; | |
797 | ||
798 | if (count <= 0) | |
799 | return 0; | |
800 | ||
36c7dc44 CM |
801 | /* |
802 | * Reading returns if the pretimeout has gone off, and it only does | |
803 | * it once per pretimeout. | |
804 | */ | |
1da177e4 LT |
805 | spin_lock(&ipmi_read_lock); |
806 | if (!data_to_read) { | |
807 | if (file->f_flags & O_NONBLOCK) { | |
808 | rv = -EAGAIN; | |
809 | goto out; | |
810 | } | |
36c7dc44 | 811 | |
1da177e4 LT |
812 | init_waitqueue_entry(&wait, current); |
813 | add_wait_queue(&read_q, &wait); | |
814 | while (!data_to_read) { | |
815 | set_current_state(TASK_INTERRUPTIBLE); | |
816 | spin_unlock(&ipmi_read_lock); | |
817 | schedule(); | |
818 | spin_lock(&ipmi_read_lock); | |
819 | } | |
820 | remove_wait_queue(&read_q, &wait); | |
36c7dc44 | 821 | |
1da177e4 LT |
822 | if (signal_pending(current)) { |
823 | rv = -ERESTARTSYS; | |
824 | goto out; | |
825 | } | |
826 | } | |
827 | data_to_read = 0; | |
828 | ||
829 | out: | |
830 | spin_unlock(&ipmi_read_lock); | |
831 | ||
832 | if (rv == 0) { | |
833 | if (copy_to_user(buf, &data_to_read, 1)) | |
834 | rv = -EFAULT; | |
835 | else | |
836 | rv = 1; | |
837 | } | |
838 | ||
839 | return rv; | |
840 | } | |
841 | ||
842 | static int ipmi_open(struct inode *ino, struct file *filep) | |
843 | { | |
36c7dc44 CM |
844 | switch (iminor(ino)) { |
845 | case WATCHDOG_MINOR: | |
e8b33617 | 846 | if (test_and_set_bit(0, &ipmi_wdog_open)) |
36c7dc44 | 847 | return -EBUSY; |
1da177e4 | 848 | |
af96f010 | 849 | |
36c7dc44 CM |
850 | /* |
851 | * Don't start the timer now, let it start on the | |
852 | * first heartbeat. | |
853 | */ | |
e8b33617 CM |
854 | ipmi_start_timer_on_heartbeat = 1; |
855 | return nonseekable_open(ino, filep); | |
1da177e4 | 856 | |
e8b33617 CM |
857 | default: |
858 | return (-ENODEV); | |
36c7dc44 | 859 | } |
1da177e4 LT |
860 | } |
861 | ||
862 | static unsigned int ipmi_poll(struct file *file, poll_table *wait) | |
863 | { | |
864 | unsigned int mask = 0; | |
36c7dc44 | 865 | |
1da177e4 LT |
866 | poll_wait(file, &read_q, wait); |
867 | ||
868 | spin_lock(&ipmi_read_lock); | |
869 | if (data_to_read) | |
870 | mask |= (POLLIN | POLLRDNORM); | |
871 | spin_unlock(&ipmi_read_lock); | |
872 | ||
873 | return mask; | |
874 | } | |
875 | ||
876 | static int ipmi_fasync(int fd, struct file *file, int on) | |
877 | { | |
878 | int result; | |
879 | ||
880 | result = fasync_helper(fd, file, on, &fasync_q); | |
881 | ||
882 | return (result); | |
883 | } | |
884 | ||
885 | static int ipmi_close(struct inode *ino, struct file *filep) | |
886 | { | |
8a3628d5 | 887 | if (iminor(ino) == WATCHDOG_MINOR) { |
1da177e4 LT |
888 | if (expect_close == 42) { |
889 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
890 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
1da177e4 | 891 | } else { |
8a3628d5 CM |
892 | printk(KERN_CRIT PFX |
893 | "Unexpected close, not stopping watchdog!\n"); | |
1da177e4 LT |
894 | ipmi_heartbeat(); |
895 | } | |
ec26d79f | 896 | clear_bit(0, &ipmi_wdog_open); |
1da177e4 LT |
897 | } |
898 | ||
1da177e4 LT |
899 | expect_close = 0; |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
62322d25 | 904 | static const struct file_operations ipmi_wdog_fops = { |
1da177e4 LT |
905 | .owner = THIS_MODULE, |
906 | .read = ipmi_read, | |
907 | .poll = ipmi_poll, | |
908 | .write = ipmi_write, | |
55929332 | 909 | .unlocked_ioctl = ipmi_unlocked_ioctl, |
1da177e4 LT |
910 | .open = ipmi_open, |
911 | .release = ipmi_close, | |
912 | .fasync = ipmi_fasync, | |
6038f373 | 913 | .llseek = no_llseek, |
1da177e4 LT |
914 | }; |
915 | ||
916 | static struct miscdevice ipmi_wdog_miscdev = { | |
917 | .minor = WATCHDOG_MINOR, | |
918 | .name = "watchdog", | |
919 | .fops = &ipmi_wdog_fops | |
920 | }; | |
921 | ||
1da177e4 LT |
922 | static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg, |
923 | void *handler_data) | |
924 | { | |
925 | if (msg->msg.data[0] != 0) { | |
926 | printk(KERN_ERR PFX "response: Error %x on cmd %x\n", | |
927 | msg->msg.data[0], | |
928 | msg->msg.cmd); | |
929 | } | |
36c7dc44 | 930 | |
1da177e4 LT |
931 | ipmi_free_recv_msg(msg); |
932 | } | |
933 | ||
934 | static void ipmi_wdog_pretimeout_handler(void *handler_data) | |
935 | { | |
936 | if (preaction_val != WDOG_PRETIMEOUT_NONE) { | |
b385676b CM |
937 | if (preop_val == WDOG_PREOP_PANIC) { |
938 | if (atomic_inc_and_test(&preop_panic_excl)) | |
939 | panic("Watchdog pre-timeout"); | |
940 | } else if (preop_val == WDOG_PREOP_GIVE_DATA) { | |
1da177e4 LT |
941 | spin_lock(&ipmi_read_lock); |
942 | data_to_read = 1; | |
943 | wake_up_interruptible(&read_q); | |
944 | kill_fasync(&fasync_q, SIGIO, POLL_IN); | |
945 | ||
946 | spin_unlock(&ipmi_read_lock); | |
947 | } | |
948 | } | |
949 | ||
36c7dc44 CM |
950 | /* |
951 | * On some machines, the heartbeat will give an error and not | |
952 | * work unless we re-enable the timer. So do so. | |
953 | */ | |
1da177e4 LT |
954 | pretimeout_since_last_heartbeat = 1; |
955 | } | |
956 | ||
36c7dc44 | 957 | static struct ipmi_user_hndl ipmi_hndlrs = { |
1da177e4 LT |
958 | .ipmi_recv_hndl = ipmi_wdog_msg_handler, |
959 | .ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_handler | |
960 | }; | |
961 | ||
962 | static void ipmi_register_watchdog(int ipmi_intf) | |
963 | { | |
964 | int rv = -EBUSY; | |
965 | ||
1da177e4 LT |
966 | if (watchdog_user) |
967 | goto out; | |
968 | ||
b2c03941 CM |
969 | if ((ifnum_to_use >= 0) && (ifnum_to_use != ipmi_intf)) |
970 | goto out; | |
971 | ||
972 | watchdog_ifnum = ipmi_intf; | |
973 | ||
1da177e4 LT |
974 | rv = ipmi_create_user(ipmi_intf, &ipmi_hndlrs, NULL, &watchdog_user); |
975 | if (rv < 0) { | |
976 | printk(KERN_CRIT PFX "Unable to register with ipmi\n"); | |
977 | goto out; | |
978 | } | |
979 | ||
980 | ipmi_get_version(watchdog_user, | |
981 | &ipmi_version_major, | |
982 | &ipmi_version_minor); | |
983 | ||
984 | rv = misc_register(&ipmi_wdog_miscdev); | |
985 | if (rv < 0) { | |
986 | ipmi_destroy_user(watchdog_user); | |
987 | watchdog_user = NULL; | |
988 | printk(KERN_CRIT PFX "Unable to register misc device\n"); | |
989 | } | |
990 | ||
612b5a8d CM |
991 | #ifdef HAVE_DIE_NMI |
992 | if (nmi_handler_registered) { | |
993 | int old_pretimeout = pretimeout; | |
994 | int old_timeout = timeout; | |
995 | int old_preop_val = preop_val; | |
996 | ||
36c7dc44 CM |
997 | /* |
998 | * Set the pretimeout to go off in a second and give | |
999 | * ourselves plenty of time to stop the timer. | |
1000 | */ | |
612b5a8d CM |
1001 | ipmi_watchdog_state = WDOG_TIMEOUT_RESET; |
1002 | preop_val = WDOG_PREOP_NONE; /* Make sure nothing happens */ | |
1003 | pretimeout = 99; | |
1004 | timeout = 100; | |
1005 | ||
1006 | testing_nmi = 1; | |
1007 | ||
1008 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
1009 | if (rv) { | |
1010 | printk(KERN_WARNING PFX "Error starting timer to" | |
1011 | " test NMI: 0x%x. The NMI pretimeout will" | |
1012 | " likely not work\n", rv); | |
1013 | rv = 0; | |
1014 | goto out_restore; | |
1015 | } | |
1016 | ||
1017 | msleep(1500); | |
1018 | ||
1019 | if (testing_nmi != 2) { | |
1020 | printk(KERN_WARNING PFX "IPMI NMI didn't seem to" | |
1021 | " occur. The NMI pretimeout will" | |
1022 | " likely not work\n"); | |
1023 | } | |
36c7dc44 | 1024 | out_restore: |
612b5a8d CM |
1025 | testing_nmi = 0; |
1026 | preop_val = old_preop_val; | |
1027 | pretimeout = old_pretimeout; | |
1028 | timeout = old_timeout; | |
1029 | } | |
1030 | #endif | |
1031 | ||
1da177e4 | 1032 | out: |
1da177e4 LT |
1033 | if ((start_now) && (rv == 0)) { |
1034 | /* Run from startup, so start the timer now. */ | |
1035 | start_now = 0; /* Disable this function after first startup. */ | |
1036 | ipmi_watchdog_state = action_val; | |
1037 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
1038 | printk(KERN_INFO PFX "Starting now!\n"); | |
612b5a8d CM |
1039 | } else { |
1040 | /* Stop the timer now. */ | |
1041 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
1042 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
1da177e4 LT |
1043 | } |
1044 | } | |
1045 | ||
b2c03941 CM |
1046 | static void ipmi_unregister_watchdog(int ipmi_intf) |
1047 | { | |
1048 | int rv; | |
1049 | ||
b2c03941 CM |
1050 | if (!watchdog_user) |
1051 | goto out; | |
1052 | ||
1053 | if (watchdog_ifnum != ipmi_intf) | |
1054 | goto out; | |
1055 | ||
1056 | /* Make sure no one can call us any more. */ | |
1057 | misc_deregister(&ipmi_wdog_miscdev); | |
1058 | ||
36c7dc44 CM |
1059 | /* |
1060 | * Wait to make sure the message makes it out. The lower layer has | |
1061 | * pointers to our buffers, we want to make sure they are done before | |
1062 | * we release our memory. | |
1063 | */ | |
b2c03941 CM |
1064 | while (atomic_read(&set_timeout_tofree)) |
1065 | schedule_timeout_uninterruptible(1); | |
1066 | ||
1067 | /* Disconnect from IPMI. */ | |
1068 | rv = ipmi_destroy_user(watchdog_user); | |
1069 | if (rv) { | |
1070 | printk(KERN_WARNING PFX "error unlinking from IPMI: %d\n", | |
1071 | rv); | |
1072 | } | |
1073 | watchdog_user = NULL; | |
1074 | ||
1075 | out: | |
f8fbcd3b | 1076 | return; |
b2c03941 CM |
1077 | } |
1078 | ||
612b5a8d | 1079 | #ifdef HAVE_DIE_NMI |
1da177e4 | 1080 | static int |
9c48f1c6 | 1081 | ipmi_nmi(unsigned int val, struct pt_regs *regs) |
1da177e4 | 1082 | { |
612b5a8d CM |
1083 | /* |
1084 | * If we get here, it's an NMI that's not a memory or I/O | |
1085 | * error. We can't truly tell if it's from IPMI or not | |
1086 | * without sending a message, and sending a message is almost | |
1087 | * impossible because of locking. | |
1088 | */ | |
1089 | ||
1090 | if (testing_nmi) { | |
1091 | testing_nmi = 2; | |
9c48f1c6 | 1092 | return NMI_HANDLED; |
612b5a8d CM |
1093 | } |
1094 | ||
36c7dc44 | 1095 | /* If we are not expecting a timeout, ignore it. */ |
8f05ee9a | 1096 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) |
9c48f1c6 | 1097 | return NMI_DONE; |
612b5a8d CM |
1098 | |
1099 | if (preaction_val != WDOG_PRETIMEOUT_NMI) | |
9c48f1c6 | 1100 | return NMI_DONE; |
8f05ee9a | 1101 | |
36c7dc44 CM |
1102 | /* |
1103 | * If no one else handled the NMI, we assume it was the IPMI | |
1104 | * watchdog. | |
1105 | */ | |
612b5a8d | 1106 | if (preop_val == WDOG_PREOP_PANIC) { |
8f05ee9a CM |
1107 | /* On some machines, the heartbeat will give |
1108 | an error and not work unless we re-enable | |
1109 | the timer. So do so. */ | |
1110 | pretimeout_since_last_heartbeat = 1; | |
b385676b CM |
1111 | if (atomic_inc_and_test(&preop_panic_excl)) |
1112 | panic(PFX "pre-timeout"); | |
8f05ee9a | 1113 | } |
1da177e4 | 1114 | |
9c48f1c6 | 1115 | return NMI_HANDLED; |
1da177e4 | 1116 | } |
1da177e4 LT |
1117 | #endif |
1118 | ||
1119 | static int wdog_reboot_handler(struct notifier_block *this, | |
1120 | unsigned long code, | |
1121 | void *unused) | |
1122 | { | |
36c7dc44 | 1123 | static int reboot_event_handled; |
1da177e4 LT |
1124 | |
1125 | if ((watchdog_user) && (!reboot_event_handled)) { | |
1126 | /* Make sure we only do this once. */ | |
1127 | reboot_event_handled = 1; | |
1128 | ||
fcfa4724 | 1129 | if (code == SYS_POWER_OFF || code == SYS_HALT) { |
1da177e4 LT |
1130 | /* Disable the WDT if we are shutting down. */ |
1131 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
1132 | panic_halt_ipmi_set_timeout(); | |
96febe9f | 1133 | } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { |
1da177e4 | 1134 | /* Set a long timer to let the reboot happens, but |
96febe9f CM |
1135 | reboot if it hangs, but only if the watchdog |
1136 | timer was already running. */ | |
1da177e4 LT |
1137 | timeout = 120; |
1138 | pretimeout = 0; | |
1139 | ipmi_watchdog_state = WDOG_TIMEOUT_RESET; | |
1140 | panic_halt_ipmi_set_timeout(); | |
1141 | } | |
1142 | } | |
1143 | return NOTIFY_OK; | |
1144 | } | |
1145 | ||
1146 | static struct notifier_block wdog_reboot_notifier = { | |
1147 | .notifier_call = wdog_reboot_handler, | |
1148 | .next = NULL, | |
1149 | .priority = 0 | |
1150 | }; | |
1151 | ||
1152 | static int wdog_panic_handler(struct notifier_block *this, | |
1153 | unsigned long event, | |
1154 | void *unused) | |
1155 | { | |
36c7dc44 | 1156 | static int panic_event_handled; |
1da177e4 | 1157 | |
96febe9f CM |
1158 | /* On a panic, if we have a panic timeout, make sure to extend |
1159 | the watchdog timer to a reasonable value to complete the | |
1160 | panic, if the watchdog timer is running. Plus the | |
1161 | pretimeout is meaningless at panic time. */ | |
1162 | if (watchdog_user && !panic_event_handled && | |
1163 | ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { | |
1164 | /* Make sure we do this only once. */ | |
1da177e4 | 1165 | panic_event_handled = 1; |
36c7dc44 | 1166 | |
1da177e4 LT |
1167 | timeout = 255; |
1168 | pretimeout = 0; | |
1da177e4 LT |
1169 | panic_halt_ipmi_set_timeout(); |
1170 | } | |
1171 | ||
1172 | return NOTIFY_OK; | |
1173 | } | |
1174 | ||
1175 | static struct notifier_block wdog_panic_notifier = { | |
1176 | .notifier_call = wdog_panic_handler, | |
1177 | .next = NULL, | |
1178 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
1179 | }; | |
1180 | ||
1181 | ||
50c812b2 | 1182 | static void ipmi_new_smi(int if_num, struct device *device) |
1da177e4 LT |
1183 | { |
1184 | ipmi_register_watchdog(if_num); | |
1185 | } | |
1186 | ||
1187 | static void ipmi_smi_gone(int if_num) | |
1188 | { | |
b2c03941 | 1189 | ipmi_unregister_watchdog(if_num); |
1da177e4 LT |
1190 | } |
1191 | ||
36c7dc44 | 1192 | static struct ipmi_smi_watcher smi_watcher = { |
1da177e4 LT |
1193 | .owner = THIS_MODULE, |
1194 | .new_smi = ipmi_new_smi, | |
1195 | .smi_gone = ipmi_smi_gone | |
1196 | }; | |
1197 | ||
cc4673ee | 1198 | static int action_op(const char *inval, char *outval) |
1da177e4 | 1199 | { |
cc4673ee CM |
1200 | if (outval) |
1201 | strcpy(outval, action); | |
1202 | ||
1203 | if (!inval) | |
1204 | return 0; | |
1da177e4 | 1205 | |
cc4673ee | 1206 | if (strcmp(inval, "reset") == 0) |
1da177e4 | 1207 | action_val = WDOG_TIMEOUT_RESET; |
cc4673ee | 1208 | else if (strcmp(inval, "none") == 0) |
1da177e4 | 1209 | action_val = WDOG_TIMEOUT_NONE; |
cc4673ee | 1210 | else if (strcmp(inval, "power_cycle") == 0) |
1da177e4 | 1211 | action_val = WDOG_TIMEOUT_POWER_CYCLE; |
cc4673ee | 1212 | else if (strcmp(inval, "power_off") == 0) |
1da177e4 | 1213 | action_val = WDOG_TIMEOUT_POWER_DOWN; |
cc4673ee CM |
1214 | else |
1215 | return -EINVAL; | |
1216 | strcpy(action, inval); | |
1217 | return 0; | |
1218 | } | |
1219 | ||
1220 | static int preaction_op(const char *inval, char *outval) | |
1221 | { | |
1222 | if (outval) | |
1223 | strcpy(outval, preaction); | |
1da177e4 | 1224 | |
cc4673ee CM |
1225 | if (!inval) |
1226 | return 0; | |
1227 | ||
1228 | if (strcmp(inval, "pre_none") == 0) | |
1da177e4 | 1229 | preaction_val = WDOG_PRETIMEOUT_NONE; |
cc4673ee | 1230 | else if (strcmp(inval, "pre_smi") == 0) |
1da177e4 | 1231 | preaction_val = WDOG_PRETIMEOUT_SMI; |
612b5a8d | 1232 | #ifdef HAVE_DIE_NMI |
cc4673ee | 1233 | else if (strcmp(inval, "pre_nmi") == 0) |
1da177e4 LT |
1234 | preaction_val = WDOG_PRETIMEOUT_NMI; |
1235 | #endif | |
cc4673ee | 1236 | else if (strcmp(inval, "pre_int") == 0) |
1da177e4 | 1237 | preaction_val = WDOG_PRETIMEOUT_MSG_INT; |
cc4673ee CM |
1238 | else |
1239 | return -EINVAL; | |
1240 | strcpy(preaction, inval); | |
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | static int preop_op(const char *inval, char *outval) | |
1245 | { | |
1246 | if (outval) | |
1247 | strcpy(outval, preop); | |
1da177e4 | 1248 | |
cc4673ee CM |
1249 | if (!inval) |
1250 | return 0; | |
1251 | ||
1252 | if (strcmp(inval, "preop_none") == 0) | |
1da177e4 | 1253 | preop_val = WDOG_PREOP_NONE; |
cc4673ee | 1254 | else if (strcmp(inval, "preop_panic") == 0) |
1da177e4 | 1255 | preop_val = WDOG_PREOP_PANIC; |
cc4673ee | 1256 | else if (strcmp(inval, "preop_give_data") == 0) |
1da177e4 | 1257 | preop_val = WDOG_PREOP_GIVE_DATA; |
cc4673ee CM |
1258 | else |
1259 | return -EINVAL; | |
1260 | strcpy(preop, inval); | |
1261 | return 0; | |
1262 | } | |
1da177e4 | 1263 | |
cc4673ee CM |
1264 | static void check_parms(void) |
1265 | { | |
612b5a8d | 1266 | #ifdef HAVE_DIE_NMI |
cc4673ee CM |
1267 | int do_nmi = 0; |
1268 | int rv; | |
1269 | ||
1da177e4 | 1270 | if (preaction_val == WDOG_PRETIMEOUT_NMI) { |
cc4673ee | 1271 | do_nmi = 1; |
1da177e4 LT |
1272 | if (preop_val == WDOG_PREOP_GIVE_DATA) { |
1273 | printk(KERN_WARNING PFX "Pretimeout op is to give data" | |
1274 | " but NMI pretimeout is enabled, setting" | |
1275 | " pretimeout op to none\n"); | |
cc4673ee CM |
1276 | preop_op("preop_none", NULL); |
1277 | do_nmi = 0; | |
1da177e4 | 1278 | } |
cc4673ee CM |
1279 | } |
1280 | if (do_nmi && !nmi_handler_registered) { | |
9c48f1c6 DZ |
1281 | rv = register_nmi_handler(NMI_UNKNOWN, ipmi_nmi, 0, |
1282 | "ipmi"); | |
1da177e4 | 1283 | if (rv) { |
cc4673ee CM |
1284 | printk(KERN_WARNING PFX |
1285 | "Can't register nmi handler\n"); | |
1286 | return; | |
1287 | } else | |
1288 | nmi_handler_registered = 1; | |
1289 | } else if (!do_nmi && nmi_handler_registered) { | |
9c48f1c6 | 1290 | unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
cc4673ee | 1291 | nmi_handler_registered = 0; |
1da177e4 LT |
1292 | } |
1293 | #endif | |
cc4673ee CM |
1294 | } |
1295 | ||
1296 | static int __init ipmi_wdog_init(void) | |
1297 | { | |
1298 | int rv; | |
1299 | ||
1300 | if (action_op(action, NULL)) { | |
1301 | action_op("reset", NULL); | |
1302 | printk(KERN_INFO PFX "Unknown action '%s', defaulting to" | |
1303 | " reset\n", action); | |
1304 | } | |
1305 | ||
1306 | if (preaction_op(preaction, NULL)) { | |
1307 | preaction_op("pre_none", NULL); | |
1308 | printk(KERN_INFO PFX "Unknown preaction '%s', defaulting to" | |
1309 | " none\n", preaction); | |
1310 | } | |
1311 | ||
1312 | if (preop_op(preop, NULL)) { | |
1313 | preop_op("preop_none", NULL); | |
1314 | printk(KERN_INFO PFX "Unknown preop '%s', defaulting to" | |
1315 | " none\n", preop); | |
1316 | } | |
1317 | ||
1318 | check_parms(); | |
1da177e4 | 1319 | |
b2c03941 CM |
1320 | register_reboot_notifier(&wdog_reboot_notifier); |
1321 | atomic_notifier_chain_register(&panic_notifier_list, | |
1322 | &wdog_panic_notifier); | |
1323 | ||
1da177e4 LT |
1324 | rv = ipmi_smi_watcher_register(&smi_watcher); |
1325 | if (rv) { | |
612b5a8d CM |
1326 | #ifdef HAVE_DIE_NMI |
1327 | if (nmi_handler_registered) | |
9c48f1c6 | 1328 | unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
1da177e4 | 1329 | #endif |
b2c03941 CM |
1330 | atomic_notifier_chain_unregister(&panic_notifier_list, |
1331 | &wdog_panic_notifier); | |
1332 | unregister_reboot_notifier(&wdog_reboot_notifier); | |
1da177e4 LT |
1333 | printk(KERN_WARNING PFX "can't register smi watcher\n"); |
1334 | return rv; | |
1335 | } | |
1336 | ||
1fdd75bd CM |
1337 | printk(KERN_INFO PFX "driver initialized\n"); |
1338 | ||
1da177e4 LT |
1339 | return 0; |
1340 | } | |
1341 | ||
b2c03941 | 1342 | static void __exit ipmi_wdog_exit(void) |
1da177e4 | 1343 | { |
b2c03941 CM |
1344 | ipmi_smi_watcher_unregister(&smi_watcher); |
1345 | ipmi_unregister_watchdog(watchdog_ifnum); | |
1da177e4 | 1346 | |
612b5a8d | 1347 | #ifdef HAVE_DIE_NMI |
cc4673ee | 1348 | if (nmi_handler_registered) |
9c48f1c6 | 1349 | unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
1da177e4 LT |
1350 | #endif |
1351 | ||
e041c683 | 1352 | atomic_notifier_chain_unregister(&panic_notifier_list, |
b2c03941 | 1353 | &wdog_panic_notifier); |
1da177e4 | 1354 | unregister_reboot_notifier(&wdog_reboot_notifier); |
1da177e4 LT |
1355 | } |
1356 | module_exit(ipmi_wdog_exit); | |
1357 | module_init(ipmi_wdog_init); | |
1358 | MODULE_LICENSE("GPL"); | |
1fdd75bd CM |
1359 | MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); |
1360 | MODULE_DESCRIPTION("watchdog timer based upon the IPMI interface."); |