Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/module.h> |
| 35 | #include <linux/moduleparam.h> |
| 36 | #include <linux/ipmi.h> |
| 37 | #include <linux/ipmi_smi.h> |
Arnd Bergmann | 609146f | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 38 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <linux/watchdog.h> |
| 40 | #include <linux/miscdevice.h> |
| 41 | #include <linux/init.h> |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 42 | #include <linux/completion.h> |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 43 | #include <linux/kdebug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 52 | #include <linux/string.h> |
| 53 | #include <linux/ctype.h> |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 54 | #include <linux/delay.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 55 | #include <linux/atomic.h> |
Corey Minyard | f64da95 | 2007-05-08 00:23:58 -0700 | [diff] [blame] | 56 | |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 57 | #ifdef CONFIG_X86 |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 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 | */ |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 67 | #include <asm/kdebug.h> |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 68 | #include <asm/nmi.h> |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 69 | #define HAVE_DIE_NMI |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #endif |
| 71 | |
| 72 | #define PFX "IPMI Watchdog: " |
| 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 102 | /* Cause data to be available to read. Doesn't work in NMI mode. */ |
| 103 | #define WDOG_PREOP_GIVE_DATA 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 114 | /* |
| 115 | * Byte 3 of the get command, byte 4 of the get response is the |
| 116 | * pre-timeout in seconds. |
| 117 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Corey Minyard | b75d91f | 2011-12-19 17:12:02 -0800 | [diff] [blame] | 142 | #define IPMI_WDOG_TIMER_NOT_INIT_RESP 0x80 |
| 143 | |
Arnd Bergmann | 609146f | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 144 | static DEFINE_MUTEX(ipmi_watchdog_mutex); |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 145 | static bool nowayout = WATCHDOG_NOWAYOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Randy Dunlap | 0c8204b | 2006-12-10 02:19:06 -0800 | [diff] [blame] | 147 | static ipmi_user_t watchdog_user; |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 148 | static int watchdog_ifnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | /* Default the timeout to 10 seconds. */ |
| 151 | static int timeout = 10; |
| 152 | |
| 153 | /* The pre-timeout is disabled by default. */ |
Randy Dunlap | 0c8204b | 2006-12-10 02:19:06 -0800 | [diff] [blame] | 154 | static int pretimeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Jean-Yves Faye | c7f42c6 | 2015-09-29 11:39:19 +0200 | [diff] [blame] | 156 | /* Default timeout to set on panic */ |
| 157 | static int panic_wdt_timeout = 255; |
| 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | /* Default action is to reset the board on a timeout. */ |
| 160 | static unsigned char action_val = WDOG_TIMEOUT_RESET; |
| 161 | |
| 162 | static char action[16] = "reset"; |
| 163 | |
| 164 | static unsigned char preaction_val = WDOG_PRETIMEOUT_NONE; |
| 165 | |
| 166 | static char preaction[16] = "pre_none"; |
| 167 | |
| 168 | static unsigned char preop_val = WDOG_PREOP_NONE; |
| 169 | |
| 170 | static char preop[16] = "preop_none"; |
| 171 | static DEFINE_SPINLOCK(ipmi_read_lock); |
Randy Dunlap | 0c8204b | 2006-12-10 02:19:06 -0800 | [diff] [blame] | 172 | static char data_to_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | static DECLARE_WAIT_QUEUE_HEAD(read_q); |
Randy Dunlap | 0c8204b | 2006-12-10 02:19:06 -0800 | [diff] [blame] | 174 | static struct fasync_struct *fasync_q; |
| 175 | static char pretimeout_since_last_heartbeat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | static char expect_close; |
| 177 | |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 178 | static int ifnum_to_use = -1; |
| 179 | |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 180 | /* Parameters to ipmi_set_timeout */ |
| 181 | #define IPMI_SET_TIMEOUT_NO_HB 0 |
| 182 | #define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1 |
| 183 | #define IPMI_SET_TIMEOUT_FORCE_HB 2 |
| 184 | |
| 185 | static int ipmi_set_timeout(int do_heartbeat); |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 186 | static void ipmi_register_watchdog(int ipmi_intf); |
| 187 | static void ipmi_unregister_watchdog(int ipmi_intf); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 188 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 189 | /* |
| 190 | * If true, the driver will start running as soon as it is configured |
| 191 | * and ready. |
| 192 | */ |
Randy Dunlap | 0c8204b | 2006-12-10 02:19:06 -0800 | [diff] [blame] | 193 | static int start_now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 195 | static int set_param_timeout(const char *val, const struct kernel_param *kp) |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 196 | { |
| 197 | char *endp; |
| 198 | int l; |
| 199 | int rv = 0; |
| 200 | |
| 201 | if (!val) |
| 202 | return -EINVAL; |
| 203 | l = simple_strtoul(val, &endp, 0); |
| 204 | if (endp == val) |
| 205 | return -EINVAL; |
| 206 | |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 207 | *((int *)kp->arg) = l; |
| 208 | if (watchdog_user) |
| 209 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 210 | |
| 211 | return rv; |
| 212 | } |
| 213 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 214 | static const struct kernel_param_ops param_ops_timeout = { |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 215 | .set = set_param_timeout, |
| 216 | .get = param_get_int, |
| 217 | }; |
| 218 | #define param_check_timeout param_check_int |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 219 | |
| 220 | typedef int (*action_fn)(const char *intval, char *outval); |
| 221 | |
| 222 | static int action_op(const char *inval, char *outval); |
| 223 | static int preaction_op(const char *inval, char *outval); |
| 224 | static int preop_op(const char *inval, char *outval); |
| 225 | static void check_parms(void); |
| 226 | |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 227 | static int set_param_str(const char *val, const struct kernel_param *kp) |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 228 | { |
| 229 | action_fn fn = (action_fn) kp->arg; |
| 230 | int rv = 0; |
Sebastien Dugué | 43cdff9 | 2006-12-29 16:46:53 -0800 | [diff] [blame] | 231 | char valcp[16]; |
| 232 | char *s; |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 233 | |
Sebastien Dugué | 43cdff9 | 2006-12-29 16:46:53 -0800 | [diff] [blame] | 234 | strncpy(valcp, val, 16); |
| 235 | valcp[15] = '\0'; |
Pekka Enberg | 66f969d | 2006-06-23 02:05:45 -0700 | [diff] [blame] | 236 | |
Sebastien Dugué | 43cdff9 | 2006-12-29 16:46:53 -0800 | [diff] [blame] | 237 | s = strstrip(valcp); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 238 | |
Pekka Enberg | 66f969d | 2006-06-23 02:05:45 -0700 | [diff] [blame] | 239 | rv = fn(s, NULL); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 240 | if (rv) |
Corey Minyard | f8fbcd3 | 2007-10-18 03:07:08 -0700 | [diff] [blame] | 241 | goto out; |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 242 | |
| 243 | check_parms(); |
| 244 | if (watchdog_user) |
| 245 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
| 246 | |
Corey Minyard | f8fbcd3 | 2007-10-18 03:07:08 -0700 | [diff] [blame] | 247 | out: |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 248 | return rv; |
| 249 | } |
| 250 | |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 251 | static int get_param_str(char *buffer, const struct kernel_param *kp) |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 252 | { |
| 253 | action_fn fn = (action_fn) kp->arg; |
| 254 | int rv; |
| 255 | |
| 256 | rv = fn(NULL, buffer); |
| 257 | if (rv) |
| 258 | return rv; |
| 259 | return strlen(buffer); |
| 260 | } |
| 261 | |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 262 | |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 263 | static int set_param_wdog_ifnum(const char *val, const struct kernel_param *kp) |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 264 | { |
| 265 | int rv = param_set_int(val, kp); |
| 266 | if (rv) |
| 267 | return rv; |
| 268 | if ((ifnum_to_use < 0) || (ifnum_to_use == watchdog_ifnum)) |
| 269 | return 0; |
| 270 | |
| 271 | ipmi_unregister_watchdog(watchdog_ifnum); |
| 272 | ipmi_register_watchdog(ifnum_to_use); |
| 273 | return 0; |
| 274 | } |
| 275 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 276 | static const struct kernel_param_ops param_ops_wdog_ifnum = { |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 277 | .set = set_param_wdog_ifnum, |
| 278 | .get = param_get_int, |
| 279 | }; |
| 280 | |
| 281 | #define param_check_wdog_ifnum param_check_int |
| 282 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 283 | static const struct kernel_param_ops param_ops_str = { |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 284 | .set = set_param_str, |
| 285 | .get = get_param_str, |
| 286 | }; |
| 287 | |
| 288 | module_param(ifnum_to_use, wdog_ifnum, 0644); |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 289 | MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog " |
| 290 | "timer. Setting to -1 defaults to the first registered " |
| 291 | "interface"); |
| 292 | |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 293 | module_param(timeout, timeout, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | MODULE_PARM_DESC(timeout, "Timeout value in seconds."); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 295 | |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 296 | module_param(pretimeout, timeout, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds."); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 298 | |
Jean-Yves Faye | c7f42c6 | 2015-09-29 11:39:19 +0200 | [diff] [blame] | 299 | module_param(panic_wdt_timeout, timeout, 0644); |
| 300 | MODULE_PARM_DESC(timeout, "Timeout value on kernel panic in seconds."); |
| 301 | |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 302 | module_param_cb(action, ¶m_ops_str, action_op, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | MODULE_PARM_DESC(action, "Timeout action. One of: " |
| 304 | "reset, none, power_cycle, power_off."); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 305 | |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 306 | module_param_cb(preaction, ¶m_ops_str, preaction_op, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | MODULE_PARM_DESC(preaction, "Pretimeout action. One of: " |
| 308 | "pre_none, pre_smi, pre_nmi, pre_int."); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 309 | |
Rusty Russell | c8ba6c5 | 2010-08-11 23:04:37 -0600 | [diff] [blame] | 310 | module_param_cb(preop, ¶m_ops_str, preop_op, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: " |
| 312 | "preop_none, preop_panic, preop_give_data."); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 313 | |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 314 | module_param(start_now, int, 0444); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as" |
| 316 | "soon as the driver is loaded."); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 317 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 318 | module_param(nowayout, bool, 0644); |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 319 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " |
| 320 | "(default=CONFIG_WATCHDOG_NOWAYOUT)"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | /* Default state of the timer. */ |
| 323 | static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
| 324 | |
| 325 | /* If shutting down via IPMI, we ignore the heartbeat. */ |
Randy Dunlap | 0c8204b | 2006-12-10 02:19:06 -0800 | [diff] [blame] | 326 | static int ipmi_ignore_heartbeat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
| 328 | /* Is someone using the watchdog? Only one user is allowed. */ |
Randy Dunlap | 0c8204b | 2006-12-10 02:19:06 -0800 | [diff] [blame] | 329 | static unsigned long ipmi_wdog_open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 331 | /* |
| 332 | * If set to 1, the heartbeat command will set the state to reset and |
| 333 | * start the timer. The timer doesn't normally run when the driver is |
| 334 | * first opened until the heartbeat is set the first time, this |
| 335 | * variable is used to accomplish this. |
| 336 | */ |
Randy Dunlap | 0c8204b | 2006-12-10 02:19:06 -0800 | [diff] [blame] | 337 | static int ipmi_start_timer_on_heartbeat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | |
| 339 | /* IPMI version of the BMC. */ |
| 340 | static unsigned char ipmi_version_major; |
| 341 | static unsigned char ipmi_version_minor; |
| 342 | |
Corey Minyard | b385676 | 2005-11-07 01:00:05 -0800 | [diff] [blame] | 343 | /* If a pretimeout occurs, this is used to allow only one panic to happen. */ |
| 344 | static atomic_t preop_panic_excl = ATOMIC_INIT(-1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 346 | #ifdef HAVE_DIE_NMI |
| 347 | static int testing_nmi; |
| 348 | static int nmi_handler_registered; |
| 349 | #endif |
| 350 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | static int ipmi_heartbeat(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 353 | /* |
| 354 | * We use a mutex to make sure that only one thing can send a set |
| 355 | * timeout at one time, because we only have one copy of the data. |
| 356 | * The mutex is claimed when the set_timeout is sent and freed |
| 357 | * when both messages are free. |
| 358 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | static atomic_t set_timeout_tofree = ATOMIC_INIT(0); |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 360 | static DEFINE_MUTEX(set_timeout_lock); |
| 361 | static DECLARE_COMPLETION(set_timeout_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | static void set_timeout_free_smi(struct ipmi_smi_msg *msg) |
| 363 | { |
| 364 | if (atomic_dec_and_test(&set_timeout_tofree)) |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 365 | complete(&set_timeout_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | } |
| 367 | static void set_timeout_free_recv(struct ipmi_recv_msg *msg) |
| 368 | { |
| 369 | if (atomic_dec_and_test(&set_timeout_tofree)) |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 370 | complete(&set_timeout_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | } |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 372 | static struct ipmi_smi_msg set_timeout_smi_msg = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | .done = set_timeout_free_smi |
| 374 | }; |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 375 | static struct ipmi_recv_msg set_timeout_recv_msg = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | .done = set_timeout_free_recv |
| 377 | }; |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | static int i_ipmi_set_timeout(struct ipmi_smi_msg *smi_msg, |
| 380 | struct ipmi_recv_msg *recv_msg, |
| 381 | int *send_heartbeat_now) |
| 382 | { |
| 383 | struct kernel_ipmi_msg msg; |
| 384 | unsigned char data[6]; |
| 385 | int rv; |
| 386 | struct ipmi_system_interface_addr addr; |
| 387 | int hbnow = 0; |
| 388 | |
| 389 | |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 390 | /* These can be cleared as we are setting the timeout. */ |
| 391 | pretimeout_since_last_heartbeat = 0; |
| 392 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | data[0] = 0; |
| 394 | WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS); |
| 395 | |
| 396 | if ((ipmi_version_major > 1) |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 397 | || ((ipmi_version_major == 1) && (ipmi_version_minor >= 5))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | /* This is an IPMI 1.5-only feature. */ |
| 399 | data[0] |= WDOG_DONT_STOP_ON_SET; |
| 400 | } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 401 | /* |
| 402 | * In ipmi 1.0, setting the timer stops the watchdog, we |
| 403 | * need to start it back up again. |
| 404 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | hbnow = 1; |
| 406 | } |
| 407 | |
| 408 | data[1] = 0; |
| 409 | WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state); |
Corey Minyard | 8f05ee9 | 2005-09-06 15:18:39 -0700 | [diff] [blame] | 410 | if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val); |
| 412 | data[2] = pretimeout; |
| 413 | } else { |
| 414 | WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE); |
| 415 | data[2] = 0; /* No pretimeout. */ |
| 416 | } |
| 417 | data[3] = 0; |
| 418 | WDOG_SET_TIMEOUT(data[4], data[5], timeout); |
| 419 | |
| 420 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; |
| 421 | addr.channel = IPMI_BMC_CHANNEL; |
| 422 | addr.lun = 0; |
| 423 | |
| 424 | msg.netfn = 0x06; |
| 425 | msg.cmd = IPMI_WDOG_SET_TIMER; |
| 426 | msg.data = data; |
| 427 | msg.data_len = sizeof(data); |
| 428 | rv = ipmi_request_supply_msgs(watchdog_user, |
| 429 | (struct ipmi_addr *) &addr, |
| 430 | 0, |
| 431 | &msg, |
| 432 | NULL, |
| 433 | smi_msg, |
| 434 | recv_msg, |
| 435 | 1); |
| 436 | if (rv) { |
| 437 | printk(KERN_WARNING PFX "set timeout error: %d\n", |
| 438 | rv); |
| 439 | } |
| 440 | |
| 441 | if (send_heartbeat_now) |
| 442 | *send_heartbeat_now = hbnow; |
| 443 | |
| 444 | return rv; |
| 445 | } |
| 446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | static int ipmi_set_timeout(int do_heartbeat) |
| 448 | { |
| 449 | int send_heartbeat_now; |
| 450 | int rv; |
| 451 | |
| 452 | |
| 453 | /* We can only send one of these at a time. */ |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 454 | mutex_lock(&set_timeout_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
| 456 | atomic_set(&set_timeout_tofree, 2); |
| 457 | |
| 458 | rv = i_ipmi_set_timeout(&set_timeout_smi_msg, |
| 459 | &set_timeout_recv_msg, |
| 460 | &send_heartbeat_now); |
| 461 | if (rv) { |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 462 | mutex_unlock(&set_timeout_lock); |
| 463 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | } |
| 465 | |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 466 | wait_for_completion(&set_timeout_wait); |
| 467 | |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 468 | mutex_unlock(&set_timeout_lock); |
| 469 | |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 470 | if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB) |
| 471 | || ((send_heartbeat_now) |
| 472 | && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY))) |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 473 | rv = ipmi_heartbeat(); |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 474 | |
| 475 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | return rv; |
| 477 | } |
| 478 | |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 479 | static atomic_t panic_done_count = ATOMIC_INIT(0); |
| 480 | |
| 481 | static void panic_smi_free(struct ipmi_smi_msg *msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | { |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 483 | atomic_dec(&panic_done_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | } |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 485 | static void panic_recv_free(struct ipmi_recv_msg *msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | { |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 487 | atomic_dec(&panic_done_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 489 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 490 | static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = { |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 491 | .done = panic_smi_free |
| 492 | }; |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 493 | static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = { |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 494 | .done = panic_recv_free |
| 495 | }; |
| 496 | |
| 497 | static void panic_halt_ipmi_heartbeat(void) |
| 498 | { |
| 499 | struct kernel_ipmi_msg msg; |
| 500 | struct ipmi_system_interface_addr addr; |
| 501 | int rv; |
| 502 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 503 | /* |
| 504 | * Don't reset the timer if we have the timer turned off, that |
| 505 | * re-enables the watchdog. |
| 506 | */ |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 507 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) |
| 508 | return; |
| 509 | |
| 510 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; |
| 511 | addr.channel = IPMI_BMC_CHANNEL; |
| 512 | addr.lun = 0; |
| 513 | |
| 514 | msg.netfn = 0x06; |
| 515 | msg.cmd = IPMI_WDOG_RESET_TIMER; |
| 516 | msg.data = NULL; |
| 517 | msg.data_len = 0; |
Corey Minyard | 895dcfd | 2012-03-28 14:42:49 -0700 | [diff] [blame] | 518 | atomic_add(2, &panic_done_count); |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 519 | rv = ipmi_request_supply_msgs(watchdog_user, |
| 520 | (struct ipmi_addr *) &addr, |
| 521 | 0, |
| 522 | &msg, |
| 523 | NULL, |
| 524 | &panic_halt_heartbeat_smi_msg, |
| 525 | &panic_halt_heartbeat_recv_msg, |
| 526 | 1); |
Corey Minyard | 895dcfd | 2012-03-28 14:42:49 -0700 | [diff] [blame] | 527 | if (rv) |
| 528 | atomic_sub(2, &panic_done_count); |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 529 | } |
| 530 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 531 | static struct ipmi_smi_msg panic_halt_smi_msg = { |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 532 | .done = panic_smi_free |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | }; |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 534 | static struct ipmi_recv_msg panic_halt_recv_msg = { |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 535 | .done = panic_recv_free |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | }; |
| 537 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 538 | /* |
| 539 | * Special call, doesn't claim any locks. This is only to be called |
| 540 | * at panic or halt time, in run-to-completion mode, when the caller |
| 541 | * is the only CPU and the only thing that will be going is these IPMI |
| 542 | * calls. |
| 543 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | static void panic_halt_ipmi_set_timeout(void) |
| 545 | { |
| 546 | int send_heartbeat_now; |
| 547 | int rv; |
| 548 | |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 549 | /* Wait for the messages to be free. */ |
| 550 | while (atomic_read(&panic_done_count) != 0) |
| 551 | ipmi_poll_interface(watchdog_user); |
Corey Minyard | 895dcfd | 2012-03-28 14:42:49 -0700 | [diff] [blame] | 552 | atomic_add(2, &panic_done_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | rv = i_ipmi_set_timeout(&panic_halt_smi_msg, |
| 554 | &panic_halt_recv_msg, |
| 555 | &send_heartbeat_now); |
Corey Minyard | 895dcfd | 2012-03-28 14:42:49 -0700 | [diff] [blame] | 556 | if (rv) { |
| 557 | atomic_sub(2, &panic_done_count); |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 558 | printk(KERN_WARNING PFX |
| 559 | "Unable to extend the watchdog timeout."); |
Corey Minyard | 895dcfd | 2012-03-28 14:42:49 -0700 | [diff] [blame] | 560 | } else { |
| 561 | if (send_heartbeat_now) |
| 562 | panic_halt_ipmi_heartbeat(); |
| 563 | } |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 564 | while (atomic_read(&panic_done_count) != 0) |
| 565 | ipmi_poll_interface(watchdog_user); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | } |
| 567 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | static atomic_t heartbeat_tofree = ATOMIC_INIT(0); |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 575 | static DEFINE_MUTEX(heartbeat_lock); |
| 576 | static DECLARE_COMPLETION(heartbeat_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | static void heartbeat_free_smi(struct ipmi_smi_msg *msg) |
| 578 | { |
| 579 | if (atomic_dec_and_test(&heartbeat_tofree)) |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 580 | complete(&heartbeat_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | } |
| 582 | static void heartbeat_free_recv(struct ipmi_recv_msg *msg) |
| 583 | { |
| 584 | if (atomic_dec_and_test(&heartbeat_tofree)) |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 585 | complete(&heartbeat_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | } |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 587 | static struct ipmi_smi_msg heartbeat_smi_msg = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | .done = heartbeat_free_smi |
| 589 | }; |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 590 | static struct ipmi_recv_msg heartbeat_recv_msg = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | .done = heartbeat_free_recv |
| 592 | }; |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 593 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | static int ipmi_heartbeat(void) |
| 595 | { |
| 596 | struct kernel_ipmi_msg msg; |
| 597 | int rv; |
| 598 | struct ipmi_system_interface_addr addr; |
Corey Minyard | b75d91f | 2011-12-19 17:12:02 -0800 | [diff] [blame] | 599 | int timeout_retries = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 601 | if (ipmi_ignore_heartbeat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
| 604 | if (ipmi_start_timer_on_heartbeat) { |
Linus Torvalds | faa8b6c | 2007-05-14 15:24:24 -0700 | [diff] [blame] | 605 | ipmi_start_timer_on_heartbeat = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | ipmi_watchdog_state = action_val; |
| 607 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); |
| 608 | } else if (pretimeout_since_last_heartbeat) { |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 609 | /* |
| 610 | * A pretimeout occurred, make sure we set the timeout. |
| 611 | * We don't want to set the action, though, we want to |
| 612 | * leave that alone (thus it can't be combined with the |
| 613 | * above operation. |
| 614 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
| 616 | } |
| 617 | |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 618 | mutex_lock(&heartbeat_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | |
Corey Minyard | b75d91f | 2011-12-19 17:12:02 -0800 | [diff] [blame] | 620 | restart: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | atomic_set(&heartbeat_tofree, 2); |
| 622 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 623 | /* |
| 624 | * Don't reset the timer if we have the timer turned off, that |
| 625 | * re-enables the watchdog. |
| 626 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) { |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 628 | mutex_unlock(&heartbeat_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | return 0; |
| 630 | } |
| 631 | |
| 632 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; |
| 633 | addr.channel = IPMI_BMC_CHANNEL; |
| 634 | addr.lun = 0; |
| 635 | |
| 636 | msg.netfn = 0x06; |
| 637 | msg.cmd = IPMI_WDOG_RESET_TIMER; |
| 638 | msg.data = NULL; |
| 639 | msg.data_len = 0; |
| 640 | rv = ipmi_request_supply_msgs(watchdog_user, |
| 641 | (struct ipmi_addr *) &addr, |
| 642 | 0, |
| 643 | &msg, |
| 644 | NULL, |
| 645 | &heartbeat_smi_msg, |
| 646 | &heartbeat_recv_msg, |
| 647 | 1); |
| 648 | if (rv) { |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 649 | mutex_unlock(&heartbeat_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | printk(KERN_WARNING PFX "heartbeat failure: %d\n", |
| 651 | rv); |
| 652 | return rv; |
| 653 | } |
| 654 | |
| 655 | /* Wait for the heartbeat to be sent. */ |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 656 | wait_for_completion(&heartbeat_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | |
Corey Minyard | b75d91f | 2011-12-19 17:12:02 -0800 | [diff] [blame] | 658 | if (heartbeat_recv_msg.msg.data[0] == IPMI_WDOG_TIMER_NOT_INIT_RESP) { |
| 659 | timeout_retries++; |
| 660 | if (timeout_retries > 3) { |
| 661 | printk(KERN_ERR PFX ": Unable to restore the IPMI" |
| 662 | " watchdog's settings, giving up.\n"); |
| 663 | rv = -EIO; |
| 664 | goto out_unlock; |
| 665 | } |
| 666 | |
| 667 | /* |
| 668 | * The timer was not initialized, that means the BMC was |
| 669 | * probably reset and lost the watchdog information. Attempt |
| 670 | * to restore the timer's info. Note that we still hold |
| 671 | * the heartbeat lock, to keep a heartbeat from happening |
| 672 | * in this process, so must say no heartbeat to avoid a |
| 673 | * deadlock on this mutex. |
| 674 | */ |
| 675 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
| 676 | if (rv) { |
| 677 | printk(KERN_ERR PFX ": Unable to send the command to" |
| 678 | " set the watchdog's settings, giving up.\n"); |
| 679 | goto out_unlock; |
| 680 | } |
| 681 | |
| 682 | /* We might need a new heartbeat, so do it now */ |
| 683 | goto restart; |
| 684 | } else if (heartbeat_recv_msg.msg.data[0] != 0) { |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 685 | /* |
| 686 | * Got an error in the heartbeat response. It was already |
| 687 | * reported in ipmi_wdog_msg_handler, but we should return |
| 688 | * an error here. |
| 689 | */ |
| 690 | rv = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | } |
| 692 | |
Corey Minyard | b75d91f | 2011-12-19 17:12:02 -0800 | [diff] [blame] | 693 | out_unlock: |
Corey Minyard | d6dfd13 | 2006-03-31 02:30:41 -0800 | [diff] [blame] | 694 | mutex_unlock(&heartbeat_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
| 696 | return rv; |
| 697 | } |
| 698 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 699 | static struct watchdog_info ident = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | .options = 0, /* WDIOF_SETTIMEOUT, */ |
| 701 | .firmware_version = 1, |
| 702 | .identity = "IPMI" |
| 703 | }; |
| 704 | |
Arnd Bergmann | 5592933 | 2010-04-27 00:24:05 +0200 | [diff] [blame] | 705 | static int ipmi_ioctl(struct file *file, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | unsigned int cmd, unsigned long arg) |
| 707 | { |
| 708 | void __user *argp = (void __user *)arg; |
| 709 | int i; |
| 710 | int val; |
| 711 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 712 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | case WDIOC_GETSUPPORT: |
| 714 | i = copy_to_user(argp, &ident, sizeof(ident)); |
| 715 | return i ? -EFAULT : 0; |
| 716 | |
| 717 | case WDIOC_SETTIMEOUT: |
| 718 | i = copy_from_user(&val, argp, sizeof(int)); |
| 719 | if (i) |
| 720 | return -EFAULT; |
| 721 | timeout = val; |
| 722 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
| 723 | |
| 724 | case WDIOC_GETTIMEOUT: |
| 725 | i = copy_to_user(argp, &timeout, sizeof(timeout)); |
| 726 | if (i) |
| 727 | return -EFAULT; |
| 728 | return 0; |
| 729 | |
Corey Minyard | 783e6bc | 2007-11-20 12:14:46 -0800 | [diff] [blame] | 730 | case WDIOC_SETPRETIMEOUT: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | i = copy_from_user(&val, argp, sizeof(int)); |
| 732 | if (i) |
| 733 | return -EFAULT; |
| 734 | pretimeout = val; |
| 735 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
| 736 | |
Corey Minyard | 783e6bc | 2007-11-20 12:14:46 -0800 | [diff] [blame] | 737 | case WDIOC_GETPRETIMEOUT: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | i = copy_to_user(argp, &pretimeout, sizeof(pretimeout)); |
| 739 | if (i) |
| 740 | return -EFAULT; |
| 741 | return 0; |
| 742 | |
| 743 | case WDIOC_KEEPALIVE: |
| 744 | return ipmi_heartbeat(); |
| 745 | |
| 746 | case WDIOC_SETOPTIONS: |
| 747 | i = copy_from_user(&val, argp, sizeof(int)); |
| 748 | if (i) |
| 749 | return -EFAULT; |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 750 | if (val & WDIOS_DISABLECARD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
| 752 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
| 753 | ipmi_start_timer_on_heartbeat = 0; |
| 754 | } |
| 755 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 756 | if (val & WDIOS_ENABLECARD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | ipmi_watchdog_state = action_val; |
| 758 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); |
| 759 | } |
| 760 | return 0; |
| 761 | |
| 762 | case WDIOC_GETSTATUS: |
| 763 | val = 0; |
| 764 | i = copy_to_user(argp, &val, sizeof(val)); |
| 765 | if (i) |
| 766 | return -EFAULT; |
| 767 | return 0; |
| 768 | |
| 769 | default: |
| 770 | return -ENOIOCTLCMD; |
| 771 | } |
| 772 | } |
| 773 | |
Arnd Bergmann | 5592933 | 2010-04-27 00:24:05 +0200 | [diff] [blame] | 774 | static long ipmi_unlocked_ioctl(struct file *file, |
| 775 | unsigned int cmd, |
| 776 | unsigned long arg) |
| 777 | { |
| 778 | int ret; |
| 779 | |
Arnd Bergmann | 609146f | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 780 | mutex_lock(&ipmi_watchdog_mutex); |
Arnd Bergmann | 5592933 | 2010-04-27 00:24:05 +0200 | [diff] [blame] | 781 | ret = ipmi_ioctl(file, cmd, arg); |
Arnd Bergmann | 609146f | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 782 | mutex_unlock(&ipmi_watchdog_mutex); |
Arnd Bergmann | 5592933 | 2010-04-27 00:24:05 +0200 | [diff] [blame] | 783 | |
| 784 | return ret; |
| 785 | } |
| 786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | static ssize_t ipmi_write(struct file *file, |
| 788 | const char __user *buf, |
| 789 | size_t len, |
| 790 | loff_t *ppos) |
| 791 | { |
| 792 | int rv; |
| 793 | |
| 794 | if (len) { |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 795 | if (!nowayout) { |
| 796 | size_t i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | /* In case it was set long ago */ |
| 799 | expect_close = 0; |
| 800 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 801 | for (i = 0; i != len; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | char c; |
| 803 | |
| 804 | if (get_user(c, buf + i)) |
| 805 | return -EFAULT; |
| 806 | if (c == 'V') |
| 807 | expect_close = 42; |
| 808 | } |
| 809 | } |
| 810 | rv = ipmi_heartbeat(); |
| 811 | if (rv) |
| 812 | return rv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | } |
Mark Rustad | 3976df9 | 2008-07-10 14:27:11 -0500 | [diff] [blame] | 814 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | } |
| 816 | |
| 817 | static ssize_t ipmi_read(struct file *file, |
| 818 | char __user *buf, |
| 819 | size_t count, |
| 820 | loff_t *ppos) |
| 821 | { |
| 822 | int rv = 0; |
| 823 | wait_queue_t wait; |
| 824 | |
| 825 | if (count <= 0) |
| 826 | return 0; |
| 827 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 828 | /* |
| 829 | * Reading returns if the pretimeout has gone off, and it only does |
| 830 | * it once per pretimeout. |
| 831 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | spin_lock(&ipmi_read_lock); |
| 833 | if (!data_to_read) { |
| 834 | if (file->f_flags & O_NONBLOCK) { |
| 835 | rv = -EAGAIN; |
| 836 | goto out; |
| 837 | } |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | init_waitqueue_entry(&wait, current); |
| 840 | add_wait_queue(&read_q, &wait); |
| 841 | while (!data_to_read) { |
| 842 | set_current_state(TASK_INTERRUPTIBLE); |
| 843 | spin_unlock(&ipmi_read_lock); |
| 844 | schedule(); |
| 845 | spin_lock(&ipmi_read_lock); |
| 846 | } |
| 847 | remove_wait_queue(&read_q, &wait); |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 848 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | if (signal_pending(current)) { |
| 850 | rv = -ERESTARTSYS; |
| 851 | goto out; |
| 852 | } |
| 853 | } |
| 854 | data_to_read = 0; |
| 855 | |
| 856 | out: |
| 857 | spin_unlock(&ipmi_read_lock); |
| 858 | |
| 859 | if (rv == 0) { |
| 860 | if (copy_to_user(buf, &data_to_read, 1)) |
| 861 | rv = -EFAULT; |
| 862 | else |
| 863 | rv = 1; |
| 864 | } |
| 865 | |
| 866 | return rv; |
| 867 | } |
| 868 | |
| 869 | static int ipmi_open(struct inode *ino, struct file *filep) |
| 870 | { |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 871 | switch (iminor(ino)) { |
| 872 | case WATCHDOG_MINOR: |
Corey Minyard | e8b3361 | 2005-09-06 15:18:45 -0700 | [diff] [blame] | 873 | if (test_and_set_bit(0, &ipmi_wdog_open)) |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 874 | return -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
Arnd Bergmann | af96f01 | 2008-05-20 19:16:04 +0200 | [diff] [blame] | 876 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 877 | /* |
| 878 | * Don't start the timer now, let it start on the |
| 879 | * first heartbeat. |
| 880 | */ |
Corey Minyard | e8b3361 | 2005-09-06 15:18:45 -0700 | [diff] [blame] | 881 | ipmi_start_timer_on_heartbeat = 1; |
| 882 | return nonseekable_open(ino, filep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
Corey Minyard | e8b3361 | 2005-09-06 15:18:45 -0700 | [diff] [blame] | 884 | default: |
| 885 | return (-ENODEV); |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 886 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | } |
| 888 | |
| 889 | static unsigned int ipmi_poll(struct file *file, poll_table *wait) |
| 890 | { |
| 891 | unsigned int mask = 0; |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 892 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | poll_wait(file, &read_q, wait); |
| 894 | |
| 895 | spin_lock(&ipmi_read_lock); |
| 896 | if (data_to_read) |
| 897 | mask |= (POLLIN | POLLRDNORM); |
| 898 | spin_unlock(&ipmi_read_lock); |
| 899 | |
| 900 | return mask; |
| 901 | } |
| 902 | |
| 903 | static int ipmi_fasync(int fd, struct file *file, int on) |
| 904 | { |
| 905 | int result; |
| 906 | |
| 907 | result = fasync_helper(fd, file, on, &fasync_q); |
| 908 | |
| 909 | return (result); |
| 910 | } |
| 911 | |
| 912 | static int ipmi_close(struct inode *ino, struct file *filep) |
| 913 | { |
Corey Minyard | 8a3628d | 2006-03-31 02:30:40 -0800 | [diff] [blame] | 914 | if (iminor(ino) == WATCHDOG_MINOR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | if (expect_close == 42) { |
| 916 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
| 917 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | } else { |
Corey Minyard | 8a3628d | 2006-03-31 02:30:40 -0800 | [diff] [blame] | 919 | printk(KERN_CRIT PFX |
| 920 | "Unexpected close, not stopping watchdog!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | ipmi_heartbeat(); |
| 922 | } |
Corey Minyard | ec26d79 | 2005-05-01 08:59:11 -0700 | [diff] [blame] | 923 | clear_bit(0, &ipmi_wdog_open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | } |
| 925 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | expect_close = 0; |
| 927 | |
| 928 | return 0; |
| 929 | } |
| 930 | |
Arjan van de Ven | 62322d2 | 2006-07-03 00:24:21 -0700 | [diff] [blame] | 931 | static const struct file_operations ipmi_wdog_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | .owner = THIS_MODULE, |
| 933 | .read = ipmi_read, |
| 934 | .poll = ipmi_poll, |
| 935 | .write = ipmi_write, |
Arnd Bergmann | 5592933 | 2010-04-27 00:24:05 +0200 | [diff] [blame] | 936 | .unlocked_ioctl = ipmi_unlocked_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | .open = ipmi_open, |
| 938 | .release = ipmi_close, |
| 939 | .fasync = ipmi_fasync, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 940 | .llseek = no_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | }; |
| 942 | |
| 943 | static struct miscdevice ipmi_wdog_miscdev = { |
| 944 | .minor = WATCHDOG_MINOR, |
| 945 | .name = "watchdog", |
| 946 | .fops = &ipmi_wdog_fops |
| 947 | }; |
| 948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg, |
| 950 | void *handler_data) |
| 951 | { |
Corey Minyard | b75d91f | 2011-12-19 17:12:02 -0800 | [diff] [blame] | 952 | if (msg->msg.cmd == IPMI_WDOG_RESET_TIMER && |
| 953 | msg->msg.data[0] == IPMI_WDOG_TIMER_NOT_INIT_RESP) |
| 954 | printk(KERN_INFO PFX "response: The IPMI controller appears" |
| 955 | " to have been reset, will attempt to reinitialize" |
| 956 | " the watchdog timer\n"); |
| 957 | else if (msg->msg.data[0] != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | printk(KERN_ERR PFX "response: Error %x on cmd %x\n", |
| 959 | msg->msg.data[0], |
| 960 | msg->msg.cmd); |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 961 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | ipmi_free_recv_msg(msg); |
| 963 | } |
| 964 | |
| 965 | static void ipmi_wdog_pretimeout_handler(void *handler_data) |
| 966 | { |
| 967 | if (preaction_val != WDOG_PRETIMEOUT_NONE) { |
Corey Minyard | b385676 | 2005-11-07 01:00:05 -0800 | [diff] [blame] | 968 | if (preop_val == WDOG_PREOP_PANIC) { |
| 969 | if (atomic_inc_and_test(&preop_panic_excl)) |
| 970 | panic("Watchdog pre-timeout"); |
| 971 | } else if (preop_val == WDOG_PREOP_GIVE_DATA) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | spin_lock(&ipmi_read_lock); |
| 973 | data_to_read = 1; |
| 974 | wake_up_interruptible(&read_q); |
| 975 | kill_fasync(&fasync_q, SIGIO, POLL_IN); |
| 976 | |
| 977 | spin_unlock(&ipmi_read_lock); |
| 978 | } |
| 979 | } |
| 980 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 981 | /* |
| 982 | * On some machines, the heartbeat will give an error and not |
| 983 | * work unless we re-enable the timer. So do so. |
| 984 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | pretimeout_since_last_heartbeat = 1; |
| 986 | } |
| 987 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 988 | static struct ipmi_user_hndl ipmi_hndlrs = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | .ipmi_recv_hndl = ipmi_wdog_msg_handler, |
| 990 | .ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_handler |
| 991 | }; |
| 992 | |
| 993 | static void ipmi_register_watchdog(int ipmi_intf) |
| 994 | { |
| 995 | int rv = -EBUSY; |
| 996 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | if (watchdog_user) |
| 998 | goto out; |
| 999 | |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 1000 | if ((ifnum_to_use >= 0) && (ifnum_to_use != ipmi_intf)) |
| 1001 | goto out; |
| 1002 | |
| 1003 | watchdog_ifnum = ipmi_intf; |
| 1004 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | rv = ipmi_create_user(ipmi_intf, &ipmi_hndlrs, NULL, &watchdog_user); |
| 1006 | if (rv < 0) { |
| 1007 | printk(KERN_CRIT PFX "Unable to register with ipmi\n"); |
| 1008 | goto out; |
| 1009 | } |
| 1010 | |
| 1011 | ipmi_get_version(watchdog_user, |
| 1012 | &ipmi_version_major, |
| 1013 | &ipmi_version_minor); |
| 1014 | |
| 1015 | rv = misc_register(&ipmi_wdog_miscdev); |
| 1016 | if (rv < 0) { |
| 1017 | ipmi_destroy_user(watchdog_user); |
| 1018 | watchdog_user = NULL; |
| 1019 | printk(KERN_CRIT PFX "Unable to register misc device\n"); |
| 1020 | } |
| 1021 | |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1022 | #ifdef HAVE_DIE_NMI |
| 1023 | if (nmi_handler_registered) { |
| 1024 | int old_pretimeout = pretimeout; |
| 1025 | int old_timeout = timeout; |
| 1026 | int old_preop_val = preop_val; |
| 1027 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 1028 | /* |
| 1029 | * Set the pretimeout to go off in a second and give |
| 1030 | * ourselves plenty of time to stop the timer. |
| 1031 | */ |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1032 | ipmi_watchdog_state = WDOG_TIMEOUT_RESET; |
| 1033 | preop_val = WDOG_PREOP_NONE; /* Make sure nothing happens */ |
| 1034 | pretimeout = 99; |
| 1035 | timeout = 100; |
| 1036 | |
| 1037 | testing_nmi = 1; |
| 1038 | |
| 1039 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); |
| 1040 | if (rv) { |
| 1041 | printk(KERN_WARNING PFX "Error starting timer to" |
| 1042 | " test NMI: 0x%x. The NMI pretimeout will" |
| 1043 | " likely not work\n", rv); |
| 1044 | rv = 0; |
| 1045 | goto out_restore; |
| 1046 | } |
| 1047 | |
| 1048 | msleep(1500); |
| 1049 | |
| 1050 | if (testing_nmi != 2) { |
| 1051 | printk(KERN_WARNING PFX "IPMI NMI didn't seem to" |
| 1052 | " occur. The NMI pretimeout will" |
| 1053 | " likely not work\n"); |
| 1054 | } |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 1055 | out_restore: |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1056 | testing_nmi = 0; |
| 1057 | preop_val = old_preop_val; |
| 1058 | pretimeout = old_pretimeout; |
| 1059 | timeout = old_timeout; |
| 1060 | } |
| 1061 | #endif |
| 1062 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | if ((start_now) && (rv == 0)) { |
| 1065 | /* Run from startup, so start the timer now. */ |
| 1066 | start_now = 0; /* Disable this function after first startup. */ |
| 1067 | ipmi_watchdog_state = action_val; |
| 1068 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); |
| 1069 | printk(KERN_INFO PFX "Starting now!\n"); |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1070 | } else { |
| 1071 | /* Stop the timer now. */ |
| 1072 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
| 1073 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | } |
| 1075 | } |
| 1076 | |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 1077 | static void ipmi_unregister_watchdog(int ipmi_intf) |
| 1078 | { |
| 1079 | int rv; |
| 1080 | |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 1081 | if (!watchdog_user) |
| 1082 | goto out; |
| 1083 | |
| 1084 | if (watchdog_ifnum != ipmi_intf) |
| 1085 | goto out; |
| 1086 | |
| 1087 | /* Make sure no one can call us any more. */ |
| 1088 | misc_deregister(&ipmi_wdog_miscdev); |
| 1089 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 1090 | /* |
| 1091 | * Wait to make sure the message makes it out. The lower layer has |
| 1092 | * pointers to our buffers, we want to make sure they are done before |
| 1093 | * we release our memory. |
| 1094 | */ |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 1095 | while (atomic_read(&set_timeout_tofree)) |
| 1096 | schedule_timeout_uninterruptible(1); |
| 1097 | |
| 1098 | /* Disconnect from IPMI. */ |
| 1099 | rv = ipmi_destroy_user(watchdog_user); |
| 1100 | if (rv) { |
| 1101 | printk(KERN_WARNING PFX "error unlinking from IPMI: %d\n", |
| 1102 | rv); |
| 1103 | } |
| 1104 | watchdog_user = NULL; |
| 1105 | |
| 1106 | out: |
Corey Minyard | f8fbcd3 | 2007-10-18 03:07:08 -0700 | [diff] [blame] | 1107 | return; |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 1108 | } |
| 1109 | |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1110 | #ifdef HAVE_DIE_NMI |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | static int |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 1112 | ipmi_nmi(unsigned int val, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | { |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1114 | /* |
| 1115 | * If we get here, it's an NMI that's not a memory or I/O |
| 1116 | * error. We can't truly tell if it's from IPMI or not |
| 1117 | * without sending a message, and sending a message is almost |
| 1118 | * impossible because of locking. |
| 1119 | */ |
| 1120 | |
| 1121 | if (testing_nmi) { |
| 1122 | testing_nmi = 2; |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 1123 | return NMI_HANDLED; |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1124 | } |
| 1125 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 1126 | /* If we are not expecting a timeout, ignore it. */ |
Corey Minyard | 8f05ee9 | 2005-09-06 15:18:39 -0700 | [diff] [blame] | 1127 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 1128 | return NMI_DONE; |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1129 | |
| 1130 | if (preaction_val != WDOG_PRETIMEOUT_NMI) |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 1131 | return NMI_DONE; |
Corey Minyard | 8f05ee9 | 2005-09-06 15:18:39 -0700 | [diff] [blame] | 1132 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 1133 | /* |
| 1134 | * If no one else handled the NMI, we assume it was the IPMI |
| 1135 | * watchdog. |
| 1136 | */ |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1137 | if (preop_val == WDOG_PREOP_PANIC) { |
Corey Minyard | 8f05ee9 | 2005-09-06 15:18:39 -0700 | [diff] [blame] | 1138 | /* On some machines, the heartbeat will give |
| 1139 | an error and not work unless we re-enable |
| 1140 | the timer. So do so. */ |
| 1141 | pretimeout_since_last_heartbeat = 1; |
Corey Minyard | b385676 | 2005-11-07 01:00:05 -0800 | [diff] [blame] | 1142 | if (atomic_inc_and_test(&preop_panic_excl)) |
Hidehiro Kawai | 73cbf4a | 2016-03-22 14:27:21 -0700 | [diff] [blame] | 1143 | nmi_panic(regs, PFX "pre-timeout"); |
Corey Minyard | 8f05ee9 | 2005-09-06 15:18:39 -0700 | [diff] [blame] | 1144 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 1146 | return NMI_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | #endif |
| 1149 | |
| 1150 | static int wdog_reboot_handler(struct notifier_block *this, |
| 1151 | unsigned long code, |
| 1152 | void *unused) |
| 1153 | { |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 1154 | static int reboot_event_handled; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | |
| 1156 | if ((watchdog_user) && (!reboot_event_handled)) { |
| 1157 | /* Make sure we only do this once. */ |
| 1158 | reboot_event_handled = 1; |
| 1159 | |
Corey Minyard | fcfa472 | 2007-10-18 03:07:09 -0700 | [diff] [blame] | 1160 | if (code == SYS_POWER_OFF || code == SYS_HALT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | /* Disable the WDT if we are shutting down. */ |
| 1162 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
Corey Minyard | 423a5bb | 2012-03-28 14:42:50 -0700 | [diff] [blame] | 1163 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
Corey Minyard | 96febe9 | 2006-06-28 04:26:55 -0700 | [diff] [blame] | 1164 | } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { |
Valentin Vidic | d933777 | 2017-05-05 21:07:33 +0200 | [diff] [blame] | 1165 | /* Set a long timer to let the reboot happen or |
| 1166 | reset if it hangs, but only if the watchdog |
Corey Minyard | 96febe9 | 2006-06-28 04:26:55 -0700 | [diff] [blame] | 1167 | timer was already running. */ |
Valentin Vidic | d933777 | 2017-05-05 21:07:33 +0200 | [diff] [blame] | 1168 | if (timeout < 120) |
| 1169 | timeout = 120; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | pretimeout = 0; |
| 1171 | ipmi_watchdog_state = WDOG_TIMEOUT_RESET; |
Corey Minyard | 423a5bb | 2012-03-28 14:42:50 -0700 | [diff] [blame] | 1172 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | } |
| 1174 | } |
| 1175 | return NOTIFY_OK; |
| 1176 | } |
| 1177 | |
| 1178 | static struct notifier_block wdog_reboot_notifier = { |
| 1179 | .notifier_call = wdog_reboot_handler, |
| 1180 | .next = NULL, |
| 1181 | .priority = 0 |
| 1182 | }; |
| 1183 | |
| 1184 | static int wdog_panic_handler(struct notifier_block *this, |
| 1185 | unsigned long event, |
| 1186 | void *unused) |
| 1187 | { |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 1188 | static int panic_event_handled; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | |
Corey Minyard | 96febe9 | 2006-06-28 04:26:55 -0700 | [diff] [blame] | 1190 | /* On a panic, if we have a panic timeout, make sure to extend |
| 1191 | the watchdog timer to a reasonable value to complete the |
| 1192 | panic, if the watchdog timer is running. Plus the |
| 1193 | pretimeout is meaningless at panic time. */ |
| 1194 | if (watchdog_user && !panic_event_handled && |
| 1195 | ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { |
| 1196 | /* Make sure we do this only once. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | panic_event_handled = 1; |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 1198 | |
Jean-Yves Faye | c7f42c6 | 2015-09-29 11:39:19 +0200 | [diff] [blame] | 1199 | timeout = panic_wdt_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | pretimeout = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | panic_halt_ipmi_set_timeout(); |
| 1202 | } |
| 1203 | |
| 1204 | return NOTIFY_OK; |
| 1205 | } |
| 1206 | |
| 1207 | static struct notifier_block wdog_panic_notifier = { |
| 1208 | .notifier_call = wdog_panic_handler, |
| 1209 | .next = NULL, |
| 1210 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ |
| 1211 | }; |
| 1212 | |
| 1213 | |
Corey Minyard | 50c812b | 2006-03-26 01:37:21 -0800 | [diff] [blame] | 1214 | static void ipmi_new_smi(int if_num, struct device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | { |
| 1216 | ipmi_register_watchdog(if_num); |
| 1217 | } |
| 1218 | |
| 1219 | static void ipmi_smi_gone(int if_num) |
| 1220 | { |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 1221 | ipmi_unregister_watchdog(if_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | } |
| 1223 | |
Corey Minyard | 36c7dc4 | 2008-04-29 01:01:12 -0700 | [diff] [blame] | 1224 | static struct ipmi_smi_watcher smi_watcher = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | .owner = THIS_MODULE, |
| 1226 | .new_smi = ipmi_new_smi, |
| 1227 | .smi_gone = ipmi_smi_gone |
| 1228 | }; |
| 1229 | |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1230 | static int action_op(const char *inval, char *outval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | { |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1232 | if (outval) |
| 1233 | strcpy(outval, action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1235 | if (!inval) |
| 1236 | return 0; |
| 1237 | |
| 1238 | if (strcmp(inval, "reset") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | action_val = WDOG_TIMEOUT_RESET; |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1240 | else if (strcmp(inval, "none") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | action_val = WDOG_TIMEOUT_NONE; |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1242 | else if (strcmp(inval, "power_cycle") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | action_val = WDOG_TIMEOUT_POWER_CYCLE; |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1244 | else if (strcmp(inval, "power_off") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | action_val = WDOG_TIMEOUT_POWER_DOWN; |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1246 | else |
| 1247 | return -EINVAL; |
| 1248 | strcpy(action, inval); |
| 1249 | return 0; |
| 1250 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1252 | static int preaction_op(const char *inval, char *outval) |
| 1253 | { |
| 1254 | if (outval) |
| 1255 | strcpy(outval, preaction); |
| 1256 | |
| 1257 | if (!inval) |
| 1258 | return 0; |
| 1259 | |
| 1260 | if (strcmp(inval, "pre_none") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | preaction_val = WDOG_PRETIMEOUT_NONE; |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1262 | else if (strcmp(inval, "pre_smi") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | preaction_val = WDOG_PRETIMEOUT_SMI; |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1264 | #ifdef HAVE_DIE_NMI |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1265 | else if (strcmp(inval, "pre_nmi") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | preaction_val = WDOG_PRETIMEOUT_NMI; |
| 1267 | #endif |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1268 | else if (strcmp(inval, "pre_int") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | preaction_val = WDOG_PRETIMEOUT_MSG_INT; |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1270 | else |
| 1271 | return -EINVAL; |
| 1272 | strcpy(preaction, inval); |
| 1273 | return 0; |
| 1274 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1276 | static int preop_op(const char *inval, char *outval) |
| 1277 | { |
| 1278 | if (outval) |
| 1279 | strcpy(outval, preop); |
| 1280 | |
| 1281 | if (!inval) |
| 1282 | return 0; |
| 1283 | |
| 1284 | if (strcmp(inval, "preop_none") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | preop_val = WDOG_PREOP_NONE; |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1286 | else if (strcmp(inval, "preop_panic") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | preop_val = WDOG_PREOP_PANIC; |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1288 | else if (strcmp(inval, "preop_give_data") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | preop_val = WDOG_PREOP_GIVE_DATA; |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1290 | else |
| 1291 | return -EINVAL; |
| 1292 | strcpy(preop, inval); |
| 1293 | return 0; |
| 1294 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1296 | static void check_parms(void) |
| 1297 | { |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1298 | #ifdef HAVE_DIE_NMI |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1299 | int do_nmi = 0; |
| 1300 | int rv; |
| 1301 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | if (preaction_val == WDOG_PRETIMEOUT_NMI) { |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1303 | do_nmi = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | if (preop_val == WDOG_PREOP_GIVE_DATA) { |
| 1305 | printk(KERN_WARNING PFX "Pretimeout op is to give data" |
| 1306 | " but NMI pretimeout is enabled, setting" |
| 1307 | " pretimeout op to none\n"); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1308 | preop_op("preop_none", NULL); |
| 1309 | do_nmi = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | } |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1312 | if (do_nmi && !nmi_handler_registered) { |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 1313 | rv = register_nmi_handler(NMI_UNKNOWN, ipmi_nmi, 0, |
| 1314 | "ipmi"); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1315 | if (rv) { |
| 1316 | printk(KERN_WARNING PFX |
| 1317 | "Can't register nmi handler\n"); |
| 1318 | return; |
| 1319 | } else |
| 1320 | nmi_handler_registered = 1; |
| 1321 | } else if (!do_nmi && nmi_handler_registered) { |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 1322 | unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1323 | nmi_handler_registered = 0; |
| 1324 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | #endif |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1326 | } |
| 1327 | |
| 1328 | static int __init ipmi_wdog_init(void) |
| 1329 | { |
| 1330 | int rv; |
| 1331 | |
| 1332 | if (action_op(action, NULL)) { |
| 1333 | action_op("reset", NULL); |
| 1334 | printk(KERN_INFO PFX "Unknown action '%s', defaulting to" |
| 1335 | " reset\n", action); |
| 1336 | } |
| 1337 | |
| 1338 | if (preaction_op(preaction, NULL)) { |
| 1339 | preaction_op("pre_none", NULL); |
| 1340 | printk(KERN_INFO PFX "Unknown preaction '%s', defaulting to" |
| 1341 | " none\n", preaction); |
| 1342 | } |
| 1343 | |
| 1344 | if (preop_op(preop, NULL)) { |
| 1345 | preop_op("preop_none", NULL); |
| 1346 | printk(KERN_INFO PFX "Unknown preop '%s', defaulting to" |
| 1347 | " none\n", preop); |
| 1348 | } |
| 1349 | |
| 1350 | check_parms(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 1352 | register_reboot_notifier(&wdog_reboot_notifier); |
| 1353 | atomic_notifier_chain_register(&panic_notifier_list, |
| 1354 | &wdog_panic_notifier); |
| 1355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | rv = ipmi_smi_watcher_register(&smi_watcher); |
| 1357 | if (rv) { |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1358 | #ifdef HAVE_DIE_NMI |
| 1359 | if (nmi_handler_registered) |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 1360 | unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | #endif |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 1362 | atomic_notifier_chain_unregister(&panic_notifier_list, |
| 1363 | &wdog_panic_notifier); |
| 1364 | unregister_reboot_notifier(&wdog_reboot_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | printk(KERN_WARNING PFX "can't register smi watcher\n"); |
| 1366 | return rv; |
| 1367 | } |
| 1368 | |
Corey Minyard | 1fdd75b | 2005-09-06 15:18:42 -0700 | [diff] [blame] | 1369 | printk(KERN_INFO PFX "driver initialized\n"); |
| 1370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | return 0; |
| 1372 | } |
| 1373 | |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 1374 | static void __exit ipmi_wdog_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | { |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 1376 | ipmi_smi_watcher_unregister(&smi_watcher); |
| 1377 | ipmi_unregister_watchdog(watchdog_ifnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | |
Corey Minyard | 612b5a8 | 2007-10-18 03:07:10 -0700 | [diff] [blame] | 1379 | #ifdef HAVE_DIE_NMI |
Corey Minyard | cc4673e | 2005-11-07 00:59:57 -0800 | [diff] [blame] | 1380 | if (nmi_handler_registered) |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 1381 | unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | #endif |
| 1383 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1384 | atomic_notifier_chain_unregister(&panic_notifier_list, |
Corey Minyard | b2c0394 | 2006-12-06 20:41:00 -0800 | [diff] [blame] | 1385 | &wdog_panic_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | unregister_reboot_notifier(&wdog_reboot_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | } |
| 1388 | module_exit(ipmi_wdog_exit); |
| 1389 | module_init(ipmi_wdog_init); |
| 1390 | MODULE_LICENSE("GPL"); |
Corey Minyard | 1fdd75b | 2005-09-06 15:18:42 -0700 | [diff] [blame] | 1391 | MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); |
| 1392 | MODULE_DESCRIPTION("watchdog timer based upon the IPMI interface."); |