1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * ipmi_poweroff.c
4 *
5 * MontaVista IPMI Poweroff extension to sys_reboot
6 *
7 * Author: MontaVista Software, Inc.
8 * Steven Dake <sdake@mvista.com>
9 * Corey Minyard <cminyard@mvista.com>
10 * source@mvista.com
11 *
12 * Copyright 2002,2004 MontaVista Software Inc.
13 */
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/proc_fs.h>
17 #include <linux/string.h>
18 #include <linux/completion.h>
19 #include <linux/pm.h>
20 #include <linux/kdev_t.h>
21 #include <linux/ipmi.h>
22 #include <linux/ipmi_smi.h>
23
24 #define PFX "IPMI poweroff: "
25
26 static void ipmi_po_smi_gone(int if_num);
27 static void ipmi_po_new_smi(int if_num, struct device *device);
28
29 /* Definitions for controlling power off (if the system supports it). It
30 * conveniently matches the IPMI chassis control values. */
31 #define IPMI_CHASSIS_POWER_DOWN 0 /* power down, the default. */
32 #define IPMI_CHASSIS_POWER_CYCLE 0x02 /* power cycle */
33
34 /* the IPMI data command */
35 static int poweroff_powercycle;
36
37 /* Which interface to use, -1 means the first we see. */
38 static int ifnum_to_use = -1;
39
40 /* Our local state. */
41 static int ready;
42 static struct ipmi_user *ipmi_user;
43 static int ipmi_ifnum;
44 static void (*specific_poweroff_func)(struct ipmi_user *user);
45
46 /* Holds the old poweroff function so we can restore it on removal. */
47 static void (*old_poweroff_func)(void);
48
set_param_ifnum(const char * val,const struct kernel_param * kp)49 static int set_param_ifnum(const char *val, const struct kernel_param *kp)
50 {
51 int rv = param_set_int(val, kp);
52 if (rv)
53 return rv;
54 if ((ifnum_to_use < 0) || (ifnum_to_use == ipmi_ifnum))
55 return 0;
56
57 ipmi_po_smi_gone(ipmi_ifnum);
58 ipmi_po_new_smi(ifnum_to_use, NULL);
59 return 0;
60 }
61
62 module_param_call(ifnum_to_use, set_param_ifnum, param_get_int,
63 &ifnum_to_use, 0644);
64 MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog "
65 "timer. Setting to -1 defaults to the first registered "
66 "interface");
67
68 /* parameter definition to allow user to flag power cycle */
69 module_param(poweroff_powercycle, int, 0644);
70 MODULE_PARM_DESC(poweroff_powercycle,
71 " Set to non-zero to enable power cycle instead of power"
72 " down. Power cycle is contingent on hardware support,"
73 " otherwise it defaults back to power down.");
74
75 /* Stuff from the get device id command. */
76 static unsigned int mfg_id;
77 static unsigned int prod_id;
78 static unsigned char capabilities;
79 static unsigned char ipmi_version;
80
81 /*
82 * We use our own messages for this operation, we don't let the system
83 * allocate them, since we may be in a panic situation. The whole
84 * thing is single-threaded, anyway, so multiple messages are not
85 * required.
86 */
87 static atomic_t dummy_count = ATOMIC_INIT(0);
dummy_smi_free(struct ipmi_smi_msg * msg)88 static void dummy_smi_free(struct ipmi_smi_msg *msg)
89 {
90 atomic_dec(&dummy_count);
91 }
dummy_recv_free(struct ipmi_recv_msg * msg)92 static void dummy_recv_free(struct ipmi_recv_msg *msg)
93 {
94 atomic_dec(&dummy_count);
95 }
96 static struct ipmi_smi_msg halt_smi_msg = {
97 .done = dummy_smi_free
98 };
99 static struct ipmi_recv_msg halt_recv_msg = {
100 .done = dummy_recv_free
101 };
102
103
104 /*
105 * Code to send a message and wait for the response.
106 */
107
receive_handler(struct ipmi_recv_msg * recv_msg,void * handler_data)108 static void receive_handler(struct ipmi_recv_msg *recv_msg, void *handler_data)
109 {
110 struct completion *comp = recv_msg->user_msg_data;
111
112 if (comp)
113 complete(comp);
114 }
115
116 static const struct ipmi_user_hndl ipmi_poweroff_handler = {
117 .ipmi_recv_hndl = receive_handler
118 };
119
120
ipmi_request_wait_for_response(struct ipmi_user * user,struct ipmi_addr * addr,struct kernel_ipmi_msg * send_msg)121 static int ipmi_request_wait_for_response(struct ipmi_user *user,
122 struct ipmi_addr *addr,
123 struct kernel_ipmi_msg *send_msg)
124 {
125 int rv;
126 struct completion comp;
127
128 init_completion(&comp);
129
130 rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, &comp,
131 &halt_smi_msg, &halt_recv_msg, 0);
132 if (rv)
133 return rv;
134
135 wait_for_completion(&comp);
136
137 return halt_recv_msg.msg.data[0];
138 }
139
140 /* Wait for message to complete, spinning. */
ipmi_request_in_rc_mode(struct ipmi_user * user,struct ipmi_addr * addr,struct kernel_ipmi_msg * send_msg)141 static int ipmi_request_in_rc_mode(struct ipmi_user *user,
142 struct ipmi_addr *addr,
143 struct kernel_ipmi_msg *send_msg)
144 {
145 int rv;
146
147 atomic_set(&dummy_count, 2);
148 rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, NULL,
149 &halt_smi_msg, &halt_recv_msg, 0);
150 if (rv) {
151 atomic_set(&dummy_count, 0);
152 return rv;
153 }
154
155 /*
156 * Spin until our message is done.
157 */
158 while (atomic_read(&dummy_count) > 0) {
159 ipmi_poll_interface(user);
160 cpu_relax();
161 }
162
163 return halt_recv_msg.msg.data[0];
164 }
165
166 /*
167 * ATCA Support
168 */
169
170 #define IPMI_NETFN_ATCA 0x2c
171 #define IPMI_ATCA_SET_POWER_CMD 0x11
172 #define IPMI_ATCA_GET_ADDR_INFO_CMD 0x01
173 #define IPMI_PICMG_ID 0
174
175 #define IPMI_NETFN_OEM 0x2e
176 #define IPMI_ATCA_PPS_GRACEFUL_RESTART 0x11
177 #define IPMI_ATCA_PPS_IANA "\x00\x40\x0A"
178 #define IPMI_MOTOROLA_MANUFACTURER_ID 0x0000A1
179 #define IPMI_MOTOROLA_PPS_IPMC_PRODUCT_ID 0x0051
180
181 static void (*atca_oem_poweroff_hook)(struct ipmi_user *user);
182
pps_poweroff_atca(struct ipmi_user * user)183 static void pps_poweroff_atca(struct ipmi_user *user)
184 {
185 struct ipmi_system_interface_addr smi_addr;
186 struct kernel_ipmi_msg send_msg;
187 int rv;
188 /*
189 * Configure IPMI address for local access
190 */
191 smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
192 smi_addr.channel = IPMI_BMC_CHANNEL;
193 smi_addr.lun = 0;
194
195 printk(KERN_INFO PFX "PPS powerdown hook used");
196
197 send_msg.netfn = IPMI_NETFN_OEM;
198 send_msg.cmd = IPMI_ATCA_PPS_GRACEFUL_RESTART;
199 send_msg.data = IPMI_ATCA_PPS_IANA;
200 send_msg.data_len = 3;
201 rv = ipmi_request_in_rc_mode(user,
202 (struct ipmi_addr *) &smi_addr,
203 &send_msg);
204 if (rv && rv != IPMI_UNKNOWN_ERR_COMPLETION_CODE) {
205 printk(KERN_ERR PFX "Unable to send ATCA ,"
206 " IPMI error 0x%x\n", rv);
207 }
208 return;
209 }
210
ipmi_atca_detect(struct ipmi_user * user)211 static int ipmi_atca_detect(struct ipmi_user *user)
212 {
213 struct ipmi_system_interface_addr smi_addr;
214 struct kernel_ipmi_msg send_msg;
215 int rv;
216 unsigned char data[1];
217
218 /*
219 * Configure IPMI address for local access
220 */
221 smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
222 smi_addr.channel = IPMI_BMC_CHANNEL;
223 smi_addr.lun = 0;
224
225 /*
226 * Use get address info to check and see if we are ATCA
227 */
228 send_msg.netfn = IPMI_NETFN_ATCA;
229 send_msg.cmd = IPMI_ATCA_GET_ADDR_INFO_CMD;
230 data[0] = IPMI_PICMG_ID;
231 send_msg.data = data;
232 send_msg.data_len = sizeof(data);
233 rv = ipmi_request_wait_for_response(user,
234 (struct ipmi_addr *) &smi_addr,
235 &send_msg);
236
237 printk(KERN_INFO PFX "ATCA Detect mfg 0x%X prod 0x%X\n",
238 mfg_id, prod_id);
239 if ((mfg_id == IPMI_MOTOROLA_MANUFACTURER_ID)
240 && (prod_id == IPMI_MOTOROLA_PPS_IPMC_PRODUCT_ID)) {
241 printk(KERN_INFO PFX
242 "Installing Pigeon Point Systems Poweroff Hook\n");
243 atca_oem_poweroff_hook = pps_poweroff_atca;
244 }
245 return !rv;
246 }
247
ipmi_poweroff_atca(struct ipmi_user * user)248 static void ipmi_poweroff_atca(struct ipmi_user *user)
249 {
250 struct ipmi_system_interface_addr smi_addr;
251 struct kernel_ipmi_msg send_msg;
252 int rv;
253 unsigned char data[4];
254
255 /*
256 * Configure IPMI address for local access
257 */
258 smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
259 smi_addr.channel = IPMI_BMC_CHANNEL;
260 smi_addr.lun = 0;
261
262 printk(KERN_INFO PFX "Powering down via ATCA power command\n");
263
264 /*
265 * Power down
266 */
267 send_msg.netfn = IPMI_NETFN_ATCA;
268 send_msg.cmd = IPMI_ATCA_SET_POWER_CMD;
269 data[0] = IPMI_PICMG_ID;
270 data[1] = 0; /* FRU id */
271 data[2] = 0; /* Power Level */
272 data[3] = 0; /* Don't change saved presets */
273 send_msg.data = data;
274 send_msg.data_len = sizeof(data);
275 rv = ipmi_request_in_rc_mode(user,
276 (struct ipmi_addr *) &smi_addr,
277 &send_msg);
278 /*
279 * At this point, the system may be shutting down, and most
280 * serial drivers (if used) will have interrupts turned off
281 * it may be better to ignore IPMI_UNKNOWN_ERR_COMPLETION_CODE
282 * return code
283 */
284 if (rv && rv != IPMI_UNKNOWN_ERR_COMPLETION_CODE) {
285 printk(KERN_ERR PFX "Unable to send ATCA powerdown message,"
286 " IPMI error 0x%x\n", rv);
287 goto out;
288 }
289
290 if (atca_oem_poweroff_hook)
291 atca_oem_poweroff_hook(user);
292 out:
293 return;
294 }
295
296 /*
297 * CPI1 Support
298 */
299
300 #define IPMI_NETFN_OEM_1 0xf8
301 #define OEM_GRP_CMD_SET_RESET_STATE 0x84
302 #define OEM_GRP_CMD_SET_POWER_STATE 0x82
303 #define IPMI_NETFN_OEM_8 0xf8
304 #define OEM_GRP_CMD_REQUEST_HOTSWAP_CTRL 0x80
305 #define OEM_GRP_CMD_GET_SLOT_GA 0xa3
306 #define IPMI_NETFN_SENSOR_EVT 0x10
307 #define IPMI_CMD_GET_EVENT_RECEIVER 0x01
308
309 #define IPMI_CPI1_PRODUCT_ID 0x000157
310 #define IPMI_CPI1_MANUFACTURER_ID 0x0108
311
ipmi_cpi1_detect(struct ipmi_user * user)312 static int ipmi_cpi1_detect(struct ipmi_user *user)
313 {
314 return ((mfg_id == IPMI_CPI1_MANUFACTURER_ID)
315 && (prod_id == IPMI_CPI1_PRODUCT_ID));
316 }
317
ipmi_poweroff_cpi1(struct ipmi_user * user)318 static void ipmi_poweroff_cpi1(struct ipmi_user *user)
319 {
320 struct ipmi_system_interface_addr smi_addr;
321 struct ipmi_ipmb_addr ipmb_addr;
322 struct kernel_ipmi_msg send_msg;
323 int rv;
324 unsigned char data[1];
325 int slot;
326 unsigned char hotswap_ipmb;
327 unsigned char aer_addr;
328 unsigned char aer_lun;
329
330 /*
331 * Configure IPMI address for local access
332 */
333 smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
334 smi_addr.channel = IPMI_BMC_CHANNEL;
335 smi_addr.lun = 0;
336
337 printk(KERN_INFO PFX "Powering down via CPI1 power command\n");
338
339 /*
340 * Get IPMI ipmb address
341 */
342 send_msg.netfn = IPMI_NETFN_OEM_8 >> 2;
343 send_msg.cmd = OEM_GRP_CMD_GET_SLOT_GA;
344 send_msg.data = NULL;
345 send_msg.data_len = 0;
346 rv = ipmi_request_in_rc_mode(user,
347 (struct ipmi_addr *) &smi_addr,
348 &send_msg);
349 if (rv)
350 goto out;
351 slot = halt_recv_msg.msg.data[1];
352 hotswap_ipmb = (slot > 9) ? (0xb0 + 2 * slot) : (0xae + 2 * slot);
353
354 /*
355 * Get active event receiver
356 */
357 send_msg.netfn = IPMI_NETFN_SENSOR_EVT >> 2;
358 send_msg.cmd = IPMI_CMD_GET_EVENT_RECEIVER;
359 send_msg.data = NULL;
360 send_msg.data_len = 0;
361 rv = ipmi_request_in_rc_mode(user,
362 (struct ipmi_addr *) &smi_addr,
363 &send_msg);
364 if (rv)
365 goto out;
366 aer_addr = halt_recv_msg.msg.data[1];
367 aer_lun = halt_recv_msg.msg.data[2];
368
369 /*
370 * Setup IPMB address target instead of local target
371 */
372 ipmb_addr.addr_type = IPMI_IPMB_ADDR_TYPE;
373 ipmb_addr.channel = 0;
374 ipmb_addr.slave_addr = aer_addr;
375 ipmb_addr.lun = aer_lun;
376
377 /*
378 * Send request hotswap control to remove blade from dpv
379 */
380 send_msg.netfn = IPMI_NETFN_OEM_8 >> 2;
381 send_msg.cmd = OEM_GRP_CMD_REQUEST_HOTSWAP_CTRL;
382 send_msg.data = &hotswap_ipmb;
383 send_msg.data_len = 1;
384 ipmi_request_in_rc_mode(user,
385 (struct ipmi_addr *) &ipmb_addr,
386 &send_msg);
387
388 /*
389 * Set reset asserted
390 */
391 send_msg.netfn = IPMI_NETFN_OEM_1 >> 2;
392 send_msg.cmd = OEM_GRP_CMD_SET_RESET_STATE;
393 send_msg.data = data;
394 data[0] = 1; /* Reset asserted state */
395 send_msg.data_len = 1;
396 rv = ipmi_request_in_rc_mode(user,
397 (struct ipmi_addr *) &smi_addr,
398 &send_msg);
399 if (rv)
400 goto out;
401
402 /*
403 * Power down
404 */
405 send_msg.netfn = IPMI_NETFN_OEM_1 >> 2;
406 send_msg.cmd = OEM_GRP_CMD_SET_POWER_STATE;
407 send_msg.data = data;
408 data[0] = 1; /* Power down state */
409 send_msg.data_len = 1;
410 rv = ipmi_request_in_rc_mode(user,
411 (struct ipmi_addr *) &smi_addr,
412 &send_msg);
413 if (rv)
414 goto out;
415
416 out:
417 return;
418 }
419
420 /*
421 * ipmi_dell_chassis_detect()
422 * Dell systems with IPMI < 1.5 don't set the chassis capability bit
423 * but they can handle a chassis poweroff or powercycle command.
424 */
425
426 #define DELL_IANA_MFR_ID {0xA2, 0x02, 0x00}
ipmi_dell_chassis_detect(struct ipmi_user * user)427 static int ipmi_dell_chassis_detect(struct ipmi_user *user)
428 {
429 const char ipmi_version_major = ipmi_version & 0xF;
430 const char ipmi_version_minor = (ipmi_version >> 4) & 0xF;
431 const char mfr[3] = DELL_IANA_MFR_ID;
432 if (!memcmp(mfr, &mfg_id, sizeof(mfr)) &&
433 ipmi_version_major <= 1 &&
434 ipmi_version_minor < 5)
435 return 1;
436 return 0;
437 }
438
439 /*
440 * ipmi_hp_chassis_detect()
441 * HP PA-RISC servers rp3410/rp3440, the C8000 workstation and the rx2600 and
442 * zx6000 machines support IPMI vers 1 and don't set the chassis capability bit
443 * but they can handle a chassis poweroff or powercycle command.
444 */
445
446 #define HP_IANA_MFR_ID 0x0b
447 #define HP_BMC_PROD_ID 0x8201
ipmi_hp_chassis_detect(struct ipmi_user * user)448 static int ipmi_hp_chassis_detect(struct ipmi_user *user)
449 {
450 if (mfg_id == HP_IANA_MFR_ID
451 && prod_id == HP_BMC_PROD_ID
452 && ipmi_version == 1)
453 return 1;
454 return 0;
455 }
456
457 /*
458 * Standard chassis support
459 */
460
461 #define IPMI_NETFN_CHASSIS_REQUEST 0
462 #define IPMI_CHASSIS_CONTROL_CMD 0x02
463
ipmi_chassis_detect(struct ipmi_user * user)464 static int ipmi_chassis_detect(struct ipmi_user *user)
465 {
466 /* Chassis support, use it. */
467 return (capabilities & 0x80);
468 }
469
ipmi_poweroff_chassis(struct ipmi_user * user)470 static void ipmi_poweroff_chassis(struct ipmi_user *user)
471 {
472 struct ipmi_system_interface_addr smi_addr;
473 struct kernel_ipmi_msg send_msg;
474 int rv;
475 unsigned char data[1];
476
477 /*
478 * Configure IPMI address for local access
479 */
480 smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
481 smi_addr.channel = IPMI_BMC_CHANNEL;
482 smi_addr.lun = 0;
483
484 powercyclefailed:
485 printk(KERN_INFO PFX "Powering %s via IPMI chassis control command\n",
486 (poweroff_powercycle ? "cycle" : "down"));
487
488 /*
489 * Power down
490 */
491 send_msg.netfn = IPMI_NETFN_CHASSIS_REQUEST;
492 send_msg.cmd = IPMI_CHASSIS_CONTROL_CMD;
493 if (poweroff_powercycle)
494 data[0] = IPMI_CHASSIS_POWER_CYCLE;
495 else
496 data[0] = IPMI_CHASSIS_POWER_DOWN;
497 send_msg.data = data;
498 send_msg.data_len = sizeof(data);
499 rv = ipmi_request_in_rc_mode(user,
500 (struct ipmi_addr *) &smi_addr,
501 &send_msg);
502 if (rv) {
503 if (poweroff_powercycle) {
504 /* power cycle failed, default to power down */
505 printk(KERN_ERR PFX "Unable to send chassis power " \
506 "cycle message, IPMI error 0x%x\n", rv);
507 poweroff_powercycle = 0;
508 goto powercyclefailed;
509 }
510
511 printk(KERN_ERR PFX "Unable to send chassis power " \
512 "down message, IPMI error 0x%x\n", rv);
513 }
514 }
515
516
517 /* Table of possible power off functions. */
518 struct poweroff_function {
519 char *platform_type;
520 int (*detect)(struct ipmi_user *user);
521 void (*poweroff_func)(struct ipmi_user *user);
522 };
523
524 static struct poweroff_function poweroff_functions[] = {
525 { .platform_type = "ATCA",
526 .detect = ipmi_atca_detect,
527 .poweroff_func = ipmi_poweroff_atca },
528 { .platform_type = "CPI1",
529 .detect = ipmi_cpi1_detect,
530 .poweroff_func = ipmi_poweroff_cpi1 },
531 { .platform_type = "chassis",
532 .detect = ipmi_dell_chassis_detect,
533 .poweroff_func = ipmi_poweroff_chassis },
534 { .platform_type = "chassis",
535 .detect = ipmi_hp_chassis_detect,
536 .poweroff_func = ipmi_poweroff_chassis },
537 /* Chassis should generally be last, other things should override
538 it. */
539 { .platform_type = "chassis",
540 .detect = ipmi_chassis_detect,
541 .poweroff_func = ipmi_poweroff_chassis },
542 };
543 #define NUM_PO_FUNCS ARRAY_SIZE(poweroff_functions)
544
545
546 /* Called on a powerdown request. */
ipmi_poweroff_function(void)547 static void ipmi_poweroff_function(void)
548 {
549 if (!ready)
550 return;
551
552 /* Use run-to-completion mode, since interrupts may be off. */
553 specific_poweroff_func(ipmi_user);
554 }
555
556 /* Wait for an IPMI interface to be installed, the first one installed
557 will be grabbed by this code and used to perform the powerdown. */
ipmi_po_new_smi(int if_num,struct device * device)558 static void ipmi_po_new_smi(int if_num, struct device *device)
559 {
560 struct ipmi_system_interface_addr smi_addr;
561 struct kernel_ipmi_msg send_msg;
562 int rv;
563 int i;
564
565 if (ready)
566 return;
567
568 if ((ifnum_to_use >= 0) && (ifnum_to_use != if_num))
569 return;
570
571 rv = ipmi_create_user(if_num, &ipmi_poweroff_handler, NULL,
572 &ipmi_user);
573 if (rv) {
574 printk(KERN_ERR PFX "could not create IPMI user, error %d\n",
575 rv);
576 return;
577 }
578
579 ipmi_ifnum = if_num;
580
581 /*
582 * Do a get device ide and store some results, since this is
583 * used by several functions.
584 */
585 smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
586 smi_addr.channel = IPMI_BMC_CHANNEL;
587 smi_addr.lun = 0;
588
589 send_msg.netfn = IPMI_NETFN_APP_REQUEST;
590 send_msg.cmd = IPMI_GET_DEVICE_ID_CMD;
591 send_msg.data = NULL;
592 send_msg.data_len = 0;
593 rv = ipmi_request_wait_for_response(ipmi_user,
594 (struct ipmi_addr *) &smi_addr,
595 &send_msg);
596 if (rv) {
597 printk(KERN_ERR PFX "Unable to send IPMI get device id info,"
598 " IPMI error 0x%x\n", rv);
599 goto out_err;
600 }
601
602 if (halt_recv_msg.msg.data_len < 12) {
603 printk(KERN_ERR PFX "(chassis) IPMI get device id info too,"
604 " short, was %d bytes, needed %d bytes\n",
605 halt_recv_msg.msg.data_len, 12);
606 goto out_err;
607 }
608
609 mfg_id = (halt_recv_msg.msg.data[7]
610 | (halt_recv_msg.msg.data[8] << 8)
611 | (halt_recv_msg.msg.data[9] << 16));
612 prod_id = (halt_recv_msg.msg.data[10]
613 | (halt_recv_msg.msg.data[11] << 8));
614 capabilities = halt_recv_msg.msg.data[6];
615 ipmi_version = halt_recv_msg.msg.data[5];
616
617
618 /* Scan for a poweroff method */
619 for (i = 0; i < NUM_PO_FUNCS; i++) {
620 if (poweroff_functions[i].detect(ipmi_user))
621 goto found;
622 }
623
624 out_err:
625 printk(KERN_ERR PFX "Unable to find a poweroff function that"
626 " will work, giving up\n");
627 ipmi_destroy_user(ipmi_user);
628 return;
629
630 found:
631 printk(KERN_INFO PFX "Found a %s style poweroff function\n",
632 poweroff_functions[i].platform_type);
633 specific_poweroff_func = poweroff_functions[i].poweroff_func;
634 old_poweroff_func = pm_power_off;
635 pm_power_off = ipmi_poweroff_function;
636 ready = 1;
637 }
638
ipmi_po_smi_gone(int if_num)639 static void ipmi_po_smi_gone(int if_num)
640 {
641 if (!ready)
642 return;
643
644 if (ipmi_ifnum != if_num)
645 return;
646
647 ready = 0;
648 ipmi_destroy_user(ipmi_user);
649 pm_power_off = old_poweroff_func;
650 }
651
652 static struct ipmi_smi_watcher smi_watcher = {
653 .owner = THIS_MODULE,
654 .new_smi = ipmi_po_new_smi,
655 .smi_gone = ipmi_po_smi_gone
656 };
657
658
659 #ifdef CONFIG_PROC_FS
660 #include <linux/sysctl.h>
661
662 static struct ctl_table ipmi_table[] = {
663 { .procname = "poweroff_powercycle",
664 .data = &poweroff_powercycle,
665 .maxlen = sizeof(poweroff_powercycle),
666 .mode = 0644,
667 .proc_handler = proc_dointvec },
668 { }
669 };
670
671 static struct ctl_table ipmi_dir_table[] = {
672 { .procname = "ipmi",
673 .mode = 0555,
674 .child = ipmi_table },
675 { }
676 };
677
678 static struct ctl_table ipmi_root_table[] = {
679 { .procname = "dev",
680 .mode = 0555,
681 .child = ipmi_dir_table },
682 { }
683 };
684
685 static struct ctl_table_header *ipmi_table_header;
686 #endif /* CONFIG_PROC_FS */
687
688 /*
689 * Startup and shutdown functions.
690 */
ipmi_poweroff_init(void)691 static int __init ipmi_poweroff_init(void)
692 {
693 int rv;
694
695 printk(KERN_INFO "Copyright (C) 2004 MontaVista Software -"
696 " IPMI Powerdown via sys_reboot.\n");
697
698 if (poweroff_powercycle)
699 printk(KERN_INFO PFX "Power cycle is enabled.\n");
700
701 #ifdef CONFIG_PROC_FS
702 ipmi_table_header = register_sysctl_table(ipmi_root_table);
703 if (!ipmi_table_header) {
704 printk(KERN_ERR PFX "Unable to register powercycle sysctl\n");
705 rv = -ENOMEM;
706 goto out_err;
707 }
708 #endif
709
710 rv = ipmi_smi_watcher_register(&smi_watcher);
711
712 #ifdef CONFIG_PROC_FS
713 if (rv) {
714 unregister_sysctl_table(ipmi_table_header);
715 printk(KERN_ERR PFX "Unable to register SMI watcher: %d\n", rv);
716 goto out_err;
717 }
718
719 out_err:
720 #endif
721 return rv;
722 }
723
724 #ifdef MODULE
ipmi_poweroff_cleanup(void)725 static void __exit ipmi_poweroff_cleanup(void)
726 {
727 int rv;
728
729 #ifdef CONFIG_PROC_FS
730 unregister_sysctl_table(ipmi_table_header);
731 #endif
732
733 ipmi_smi_watcher_unregister(&smi_watcher);
734
735 if (ready) {
736 rv = ipmi_destroy_user(ipmi_user);
737 if (rv)
738 printk(KERN_ERR PFX "could not cleanup the IPMI"
739 " user: 0x%x\n", rv);
740 pm_power_off = old_poweroff_func;
741 }
742 }
743 module_exit(ipmi_poweroff_cleanup);
744 #endif
745
746 module_init(ipmi_poweroff_init);
747 MODULE_LICENSE("GPL");
748 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
749 MODULE_DESCRIPTION("IPMI Poweroff extension to sys_reboot");
750
