drivers/char/ipmi/ipmi_poweroff.c

   1 /*
   2  * ipmi_poweroff.c
   3  *
   4  * MontaVista IPMI Poweroff extension to sys_reboot
   5  *
   6  * Author: MontaVista Software, Inc.
   7  *         Steven Dake <sdake@mvista.com>
   8  *         Corey Minyard <cminyard@mvista.com>
   9  *         source@mvista.com
  10  *
  11  * Copyright 2002,2004 MontaVista Software Inc.
  12  *
  13  *  This program is free software; you can redistribute it and/or modify it
  14  *  under the terms of the GNU General Public License as published by the
  15  *  Free Software Foundation; either version 2 of the License, or (at your
  16  *  option) any later version.
  17  *
  18  *
  19  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  20  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  25  *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  26  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  27  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  28  *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  *  You should have received a copy of the GNU General Public License along
  31  *  with this program; if not, write to the Free Software Foundation, Inc.,
  32  *  675 Mass Ave, Cambridge, MA 02139, USA.
  33  */
  34 #include <linux/module.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/string.h>
  38 #include <linux/completion.h>
  39 #include <linux/pm.h>
  40 #include <linux/kdev_t.h>
  41 #include <linux/ipmi.h>
  42 #include <linux/ipmi_smi.h>
  43
  44 #define PFX "IPMI poweroff: "
  45
  46 static void ipmi_po_smi_gone(int if_num);
  47 static void ipmi_po_new_smi(int if_num, struct device *device);
  48
  49 /* Definitions for controlling power off (if the system supports it).  It
  50  * conveniently matches the IPMI chassis control values. */
  51 #define IPMI_CHASSIS_POWER_DOWN         0       /* power down, the default. */
  52 #define IPMI_CHASSIS_POWER_CYCLE        0x02    /* power cycle */
  53
  54 /* the IPMI data command */
  55 static int poweroff_powercycle;
  56
  57 /* Which interface to use, -1 means the first we see. */
  58 static int ifnum_to_use = -1;
  59
  60 /* Our local state. */
  61 static int ready;
  62 static ipmi_user_t ipmi_user;
  63 static int ipmi_ifnum;
  64 static void (*specific_poweroff_func)(ipmi_user_t user);
  65
  66 /* Holds the old poweroff function so we can restore it on removal. */
  67 static void (*old_poweroff_func)(void);
  68
  69 static int set_param_ifnum(const char *val, struct kernel_param *kp)
  70 {
  71         int rv = param_set_int(val, kp);
  72         if (rv)
  73                 return rv;
  74         if ((ifnum_to_use < 0) || (ifnum_to_use == ipmi_ifnum))
  75                 return 0;
  76
  77         ipmi_po_smi_gone(ipmi_ifnum);
  78         ipmi_po_new_smi(ifnum_to_use, NULL);
  79         return 0;
  80 }
  81
  82 module_param_call(ifnum_to_use, set_param_ifnum, param_get_int,
  83                   &ifnum_to_use, 0644);
  84 MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog "
  85                  "timer.  Setting to -1 defaults to the first registered "
  86                  "interface");
  87
  88 /* parameter definition to allow user to flag power cycle */
  89 module_param(poweroff_powercycle, int, 0644);
  90 MODULE_PARM_DESC(poweroff_powercycle, " Set to non-zero to enable power cycle instead of power down. Power cycle is contingent on hardware support, otherwise it defaults back to power down.");
  91
  92 /* Stuff from the get device id command. */
  93 static unsigned int mfg_id;
  94 static unsigned int prod_id;
  95 static unsigned char capabilities;
  96 static unsigned char ipmi_version;
  97
  98 /* We use our own messages for this operation, we don't let the system
  99    allocate them, since we may be in a panic situation.  The whole
 100    thing is single-threaded, anyway, so multiple messages are not
 101    required. */
 102 static void dummy_smi_free(struct ipmi_smi_msg *msg)
 103 {
 104 }
 105 static void dummy_recv_free(struct ipmi_recv_msg *msg)
 106 {
 107 }
 108 static struct ipmi_smi_msg halt_smi_msg =
 109 {
 110         .done = dummy_smi_free
 111 };
 112 static struct ipmi_recv_msg halt_recv_msg =
 113 {
 114         .done = dummy_recv_free
 115 };
 116
 117
 118 /*
 119  * Code to send a message and wait for the reponse.
 120  */
 121
 122 static void receive_handler(struct ipmi_recv_msg *recv_msg, void *handler_data)
 123 {
 124         struct completion *comp = recv_msg->user_msg_data;
 125
 126         if (comp)
 127                 complete(comp);
 128 }
 129
 130 static struct ipmi_user_hndl ipmi_poweroff_handler =
 131 {
 132         .ipmi_recv_hndl = receive_handler
 133 };
 134
 135
 136 static int ipmi_request_wait_for_response(ipmi_user_t            user,
 137                                           struct ipmi_addr       *addr,
 138                                           struct kernel_ipmi_msg *send_msg)
 139 {
 140         int               rv;
 141         struct completion comp;
 142
 143         init_completion(&comp);
 144
 145         rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, &comp,
 146                                       &halt_smi_msg, &halt_recv_msg, 0);
 147         if (rv)
 148                 return rv;
 149
 150         wait_for_completion(&comp);
 151
 152         return halt_recv_msg.msg.data[0];
 153 }
 154
 155 /* We are in run-to-completion mode, no completion is desired. */
 156 static int ipmi_request_in_rc_mode(ipmi_user_t            user,
 157                                    struct ipmi_addr       *addr,
 158                                    struct kernel_ipmi_msg *send_msg)
 159 {
 160         int rv;
 161
 162         rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, NULL,
 163                                       &halt_smi_msg, &halt_recv_msg, 0);
 164         if (rv)
 165                 return rv;
 166
 167         return halt_recv_msg.msg.data[0];
 168 }
 169
 170 /*
 171  * ATCA Support
 172  */
 173
 174 #define IPMI_NETFN_ATCA                 0x2c
 175 #define IPMI_ATCA_SET_POWER_CMD         0x11
 176 #define IPMI_ATCA_GET_ADDR_INFO_CMD     0x01
 177 #define IPMI_PICMG_ID                   0
 178
 179 #define IPMI_NETFN_OEM                          0x2e
 180 #define IPMI_ATCA_PPS_GRACEFUL_RESTART          0x11
 181 #define IPMI_ATCA_PPS_IANA                      "\x00\x40\x0A"
 182 #define IPMI_MOTOROLA_MANUFACTURER_ID           0x0000A1
 183 #define IPMI_MOTOROLA_PPS_IPMC_PRODUCT_ID       0x0051
 184
 185 static void (*atca_oem_poweroff_hook)(ipmi_user_t user);
 186
 187 static void pps_poweroff_atca (ipmi_user_t user)
 188 {
 189         struct ipmi_system_interface_addr smi_addr;
 190         struct kernel_ipmi_msg            send_msg;
 191         int                               rv;
 192         /*
 193          * Configure IPMI address for local access
 194          */
 195         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 196         smi_addr.channel = IPMI_BMC_CHANNEL;
 197         smi_addr.lun = 0;
 198
 199         printk(KERN_INFO PFX "PPS powerdown hook used");
 200
 201         send_msg.netfn = IPMI_NETFN_OEM;
 202         send_msg.cmd = IPMI_ATCA_PPS_GRACEFUL_RESTART;
 203         send_msg.data = IPMI_ATCA_PPS_IANA;
 204         send_msg.data_len = 3;
 205         rv = ipmi_request_in_rc_mode(user,
 206                                   (struct ipmi_addr *) &smi_addr,
 207                                    &send_msg);
 208         if (rv && rv != IPMI_UNKNOWN_ERR_COMPLETION_CODE) {
 209                 printk(KERN_ERR PFX "Unable to send ATCA ,"
 210                        " IPMI error 0x%x\n", rv);
 211         }
 212         return;
 213 }
 214
 215 static int ipmi_atca_detect (ipmi_user_t user)
 216 {
 217         struct ipmi_system_interface_addr smi_addr;
 218         struct kernel_ipmi_msg            send_msg;
 219         int                               rv;
 220         unsigned char                     data[1];
 221
 222         /*
 223          * Configure IPMI address for local access
 224          */
 225         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 226         smi_addr.channel = IPMI_BMC_CHANNEL;
 227         smi_addr.lun = 0;
 228
 229         /*
 230          * Use get address info to check and see if we are ATCA
 231          */
 232         send_msg.netfn = IPMI_NETFN_ATCA;
 233         send_msg.cmd = IPMI_ATCA_GET_ADDR_INFO_CMD;
 234         data[0] = IPMI_PICMG_ID;
 235         send_msg.data = data;
 236         send_msg.data_len = sizeof(data);
 237         rv = ipmi_request_wait_for_response(user,
 238                                             (struct ipmi_addr *) &smi_addr,
 239                                             &send_msg);
 240
 241         printk(KERN_INFO PFX "ATCA Detect mfg 0x%X prod 0x%X\n", mfg_id, prod_id);
 242         if((mfg_id == IPMI_MOTOROLA_MANUFACTURER_ID)
 243             && (prod_id == IPMI_MOTOROLA_PPS_IPMC_PRODUCT_ID)) {
 244                 printk(KERN_INFO PFX "Installing Pigeon Point Systems Poweroff Hook\n");
 245                 atca_oem_poweroff_hook = pps_poweroff_atca;
 246         }
 247         return !rv;
 248 }
 249
 250 static void ipmi_poweroff_atca (ipmi_user_t user)
 251 {
 252         struct ipmi_system_interface_addr smi_addr;
 253         struct kernel_ipmi_msg            send_msg;
 254         int                               rv;
 255         unsigned char                     data[4];
 256
 257         /*
 258          * Configure IPMI address for local access
 259          */
 260         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 261         smi_addr.channel = IPMI_BMC_CHANNEL;
 262         smi_addr.lun = 0;
 263
 264         printk(KERN_INFO PFX "Powering down via ATCA power command\n");
 265
 266         /*
 267          * Power down
 268          */
 269         send_msg.netfn = IPMI_NETFN_ATCA;
 270         send_msg.cmd = IPMI_ATCA_SET_POWER_CMD;
 271         data[0] = IPMI_PICMG_ID;
 272         data[1] = 0; /* FRU id */
 273         data[2] = 0; /* Power Level */
 274         data[3] = 0; /* Don't change saved presets */
 275         send_msg.data = data;
 276         send_msg.data_len = sizeof (data);
 277         rv = ipmi_request_in_rc_mode(user,
 278                                      (struct ipmi_addr *) &smi_addr,
 279                                      &send_msg);
 280         /** At this point, the system may be shutting down, and most
 281          ** serial drivers (if used) will have interrupts turned off
 282          ** it may be better to ignore IPMI_UNKNOWN_ERR_COMPLETION_CODE
 283          ** return code
 284          **/
 285         if (rv && rv != IPMI_UNKNOWN_ERR_COMPLETION_CODE) {
 286                 printk(KERN_ERR PFX "Unable to send ATCA powerdown message,"
 287                        " IPMI error 0x%x\n", rv);
 288                 goto out;
 289         }
 290
 291         if(atca_oem_poweroff_hook)
 292                 return atca_oem_poweroff_hook(user);
 293  out:
 294         return;
 295 }
 296
 297 /*
 298  * CPI1 Support
 299  */
 300
 301 #define IPMI_NETFN_OEM_1                                0xf8
 302 #define OEM_GRP_CMD_SET_RESET_STATE             0x84
 303 #define OEM_GRP_CMD_SET_POWER_STATE             0x82
 304 #define IPMI_NETFN_OEM_8                                0xf8
 305 #define OEM_GRP_CMD_REQUEST_HOTSWAP_CTRL        0x80
 306 #define OEM_GRP_CMD_GET_SLOT_GA                 0xa3
 307 #define IPMI_NETFN_SENSOR_EVT                   0x10
 308 #define IPMI_CMD_GET_EVENT_RECEIVER             0x01
 309
 310 #define IPMI_CPI1_PRODUCT_ID            0x000157
 311 #define IPMI_CPI1_MANUFACTURER_ID       0x0108
 312
 313 static int ipmi_cpi1_detect (ipmi_user_t user)
 314 {
 315         return ((mfg_id == IPMI_CPI1_MANUFACTURER_ID)
 316                 && (prod_id == IPMI_CPI1_PRODUCT_ID));
 317 }
 318
 319 static void ipmi_poweroff_cpi1 (ipmi_user_t user)
 320 {
 321         struct ipmi_system_interface_addr smi_addr;
 322         struct ipmi_ipmb_addr             ipmb_addr;
 323         struct kernel_ipmi_msg            send_msg;
 324         int                               rv;
 325         unsigned char                     data[1];
 326         int                               slot;
 327         unsigned char                     hotswap_ipmb;
 328         unsigned char                     aer_addr;
 329         unsigned char                     aer_lun;
 330
 331         /*
 332          * Configure IPMI address for local access
 333          */
 334         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 335         smi_addr.channel = IPMI_BMC_CHANNEL;
 336         smi_addr.lun = 0;
 337
 338         printk(KERN_INFO PFX "Powering down via CPI1 power command\n");
 339
 340         /*
 341          * Get IPMI ipmb address
 342          */
 343         send_msg.netfn = IPMI_NETFN_OEM_8 >> 2;
 344         send_msg.cmd = OEM_GRP_CMD_GET_SLOT_GA;
 345         send_msg.data = NULL;
 346         send_msg.data_len = 0;
 347         rv = ipmi_request_in_rc_mode(user,
 348                                      (struct ipmi_addr *) &smi_addr,
 349                                      &send_msg);
 350         if (rv)
 351                 goto out;
 352         slot = halt_recv_msg.msg.data[1];
 353         hotswap_ipmb = (slot > 9) ? (0xb0 + 2 * slot) : (0xae + 2 * slot);
 354
 355         /*
 356          * Get active event receiver
 357          */
 358         send_msg.netfn = IPMI_NETFN_SENSOR_EVT >> 2;
 359         send_msg.cmd = IPMI_CMD_GET_EVENT_RECEIVER;
 360         send_msg.data = NULL;
 361         send_msg.data_len = 0;
 362         rv = ipmi_request_in_rc_mode(user,
 363                                      (struct ipmi_addr *) &smi_addr,
 364                                      &send_msg);
 365         if (rv)
 366                 goto out;
 367         aer_addr = halt_recv_msg.msg.data[1];
 368         aer_lun = halt_recv_msg.msg.data[2];
 369
 370         /*
 371          * Setup IPMB address target instead of local target
 372          */
 373         ipmb_addr.addr_type = IPMI_IPMB_ADDR_TYPE;
 374         ipmb_addr.channel = 0;
 375         ipmb_addr.slave_addr = aer_addr;
 376         ipmb_addr.lun = aer_lun;
 377
 378         /*
 379          * Send request hotswap control to remove blade from dpv
 380          */
 381         send_msg.netfn = IPMI_NETFN_OEM_8 >> 2;
 382         send_msg.cmd = OEM_GRP_CMD_REQUEST_HOTSWAP_CTRL;
 383         send_msg.data = &hotswap_ipmb;
 384         send_msg.data_len = 1;
 385         ipmi_request_in_rc_mode(user,
 386                                 (struct ipmi_addr *) &ipmb_addr,
 387                                 &send_msg);
 388
 389         /*
 390          * Set reset asserted
 391          */
 392         send_msg.netfn = IPMI_NETFN_OEM_1 >> 2;
 393         send_msg.cmd = OEM_GRP_CMD_SET_RESET_STATE;
 394         send_msg.data = data;
 395         data[0] = 1; /* Reset asserted state */
 396         send_msg.data_len = 1;
 397         rv = ipmi_request_in_rc_mode(user,
 398                                      (struct ipmi_addr *) &smi_addr,
 399                                      &send_msg);
 400         if (rv)
 401                 goto out;
 402
 403         /*
 404          * Power down
 405          */
 406         send_msg.netfn = IPMI_NETFN_OEM_1 >> 2;
 407         send_msg.cmd = OEM_GRP_CMD_SET_POWER_STATE;
 408         send_msg.data = data;
 409         data[0] = 1; /* Power down state */
 410         send_msg.data_len = 1;
 411         rv = ipmi_request_in_rc_mode(user,
 412                                      (struct ipmi_addr *) &smi_addr,
 413                                      &send_msg);
 414         if (rv)
 415                 goto out;
 416
 417  out:
 418         return;
 419 }
 420
 421 /*
 422  * ipmi_dell_chassis_detect()
 423  * Dell systems with IPMI < 1.5 don't set the chassis capability bit
 424  * but they can handle a chassis poweroff or powercycle command.
 425  */
 426
 427 #define DELL_IANA_MFR_ID {0xA2, 0x02, 0x00}
 428 static int ipmi_dell_chassis_detect (ipmi_user_t user)
 429 {
 430         const char ipmi_version_major = ipmi_version & 0xF;
 431         const char ipmi_version_minor = (ipmi_version >> 4) & 0xF;
 432         const char mfr[3] = DELL_IANA_MFR_ID;
 433         if (!memcmp(mfr, &mfg_id, sizeof(mfr)) &&
 434             ipmi_version_major <= 1 &&
 435             ipmi_version_minor < 5)
 436                 return 1;
 437         return 0;
 438 }
 439
 440 /*
 441  * Standard chassis support
 442  */
 443
 444 #define IPMI_NETFN_CHASSIS_REQUEST      0
 445 #define IPMI_CHASSIS_CONTROL_CMD        0x02
 446
 447 static int ipmi_chassis_detect (ipmi_user_t user)
 448 {
 449         /* Chassis support, use it. */
 450         return (capabilities & 0x80);
 451 }
 452
 453 static void ipmi_poweroff_chassis (ipmi_user_t user)
 454 {
 455         struct ipmi_system_interface_addr smi_addr;
 456         struct kernel_ipmi_msg            send_msg;
 457         int                               rv;
 458         unsigned char                     data[1];
 459
 460         /*
 461          * Configure IPMI address for local access
 462          */
 463         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 464         smi_addr.channel = IPMI_BMC_CHANNEL;
 465         smi_addr.lun = 0;
 466
 467  powercyclefailed:
 468         printk(KERN_INFO PFX "Powering %s via IPMI chassis control command\n",
 469                 (poweroff_powercycle ? "cycle" : "down"));
 470
 471         /*
 472          * Power down
 473          */
 474         send_msg.netfn = IPMI_NETFN_CHASSIS_REQUEST;
 475         send_msg.cmd = IPMI_CHASSIS_CONTROL_CMD;
 476         if (poweroff_powercycle)
 477                 data[0] = IPMI_CHASSIS_POWER_CYCLE;
 478         else
 479                 data[0] = IPMI_CHASSIS_POWER_DOWN;
 480         send_msg.data = data;
 481         send_msg.data_len = sizeof(data);
 482         rv = ipmi_request_in_rc_mode(user,
 483                                      (struct ipmi_addr *) &smi_addr,
 484                                      &send_msg);
 485         if (rv) {
 486                 if (poweroff_powercycle) {
 487                         /* power cycle failed, default to power down */
 488                         printk(KERN_ERR PFX "Unable to send chassis power " \
 489                                "cycle message, IPMI error 0x%x\n", rv);
 490                         poweroff_powercycle = 0;
 491                         goto powercyclefailed;
 492                 }
 493
 494                 printk(KERN_ERR PFX "Unable to send chassis power " \
 495                        "down message, IPMI error 0x%x\n", rv);
 496         }
 497 }
 498
 499
 500 /* Table of possible power off functions. */
 501 struct poweroff_function {
 502         char *platform_type;
 503         int  (*detect)(ipmi_user_t user);
 504         void (*poweroff_func)(ipmi_user_t user);
 505 };
 506
 507 static struct poweroff_function poweroff_functions[] = {
 508         { .platform_type        = "ATCA",
 509           .detect               = ipmi_atca_detect,
 510           .poweroff_func        = ipmi_poweroff_atca },
 511         { .platform_type        = "CPI1",
 512           .detect               = ipmi_cpi1_detect,
 513           .poweroff_func        = ipmi_poweroff_cpi1 },
 514         { .platform_type        = "chassis",
 515           .detect               = ipmi_dell_chassis_detect,
 516           .poweroff_func        = ipmi_poweroff_chassis },
 517         /* Chassis should generally be last, other things should override
 518            it. */
 519         { .platform_type        = "chassis",
 520           .detect               = ipmi_chassis_detect,
 521           .poweroff_func        = ipmi_poweroff_chassis },
 522 };
 523 #define NUM_PO_FUNCS (sizeof(poweroff_functions) \
 524                       / sizeof(struct poweroff_function))
 525
 526
 527 /* Called on a powerdown request. */
 528 static void ipmi_poweroff_function (void)
 529 {
 530         if (!ready)
 531                 return;
 532
 533         /* Use run-to-completion mode, since interrupts may be off. */
 534         ipmi_user_set_run_to_completion(ipmi_user, 1);
 535         specific_poweroff_func(ipmi_user);
 536         ipmi_user_set_run_to_completion(ipmi_user, 0);
 537 }
 538
 539 /* Wait for an IPMI interface to be installed, the first one installed
 540    will be grabbed by this code and used to perform the powerdown. */
 541 static void ipmi_po_new_smi(int if_num, struct device *device)
 542 {
 543         struct ipmi_system_interface_addr smi_addr;
 544         struct kernel_ipmi_msg            send_msg;
 545         int                               rv;
 546         int                               i;
 547
 548         if (ready)
 549                 return;
 550
 551         if ((ifnum_to_use >= 0) && (ifnum_to_use != if_num))
 552                 return;
 553
 554         rv = ipmi_create_user(if_num, &ipmi_poweroff_handler, NULL,
 555                               &ipmi_user);
 556         if (rv) {
 557                 printk(KERN_ERR PFX "could not create IPMI user, error %d\n",
 558                        rv);
 559                 return;
 560         }
 561
 562         ipmi_ifnum = if_num;
 563
 564         /*
 565          * Do a get device ide and store some results, since this is
 566          * used by several functions.
 567          */
 568         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 569         smi_addr.channel = IPMI_BMC_CHANNEL;
 570         smi_addr.lun = 0;
 571
 572         send_msg.netfn = IPMI_NETFN_APP_REQUEST;
 573         send_msg.cmd = IPMI_GET_DEVICE_ID_CMD;
 574         send_msg.data = NULL;
 575         send_msg.data_len = 0;
 576         rv = ipmi_request_wait_for_response(ipmi_user,
 577                                             (struct ipmi_addr *) &smi_addr,
 578                                             &send_msg);
 579         if (rv) {
 580                 printk(KERN_ERR PFX "Unable to send IPMI get device id info,"
 581                        " IPMI error 0x%x\n", rv);
 582                 goto out_err;
 583         }
 584
 585         if (halt_recv_msg.msg.data_len < 12) {
 586                 printk(KERN_ERR PFX "(chassis) IPMI get device id info too,"
 587                        " short, was %d bytes, needed %d bytes\n",
 588                        halt_recv_msg.msg.data_len, 12);
 589                 goto out_err;
 590         }
 591
 592         mfg_id = (halt_recv_msg.msg.data[7]
 593                   | (halt_recv_msg.msg.data[8] << 8)
 594                   | (halt_recv_msg.msg.data[9] << 16));
 595         prod_id = (halt_recv_msg.msg.data[10]
 596                    | (halt_recv_msg.msg.data[11] << 8));
 597         capabilities = halt_recv_msg.msg.data[6];
 598         ipmi_version = halt_recv_msg.msg.data[5];
 599
 600
 601         /* Scan for a poweroff method */
 602         for (i = 0; i < NUM_PO_FUNCS; i++) {
 603                 if (poweroff_functions[i].detect(ipmi_user))
 604                         goto found;
 605         }
 606
 607  out_err:
 608         printk(KERN_ERR PFX "Unable to find a poweroff function that"
 609                " will work, giving up\n");
 610         ipmi_destroy_user(ipmi_user);
 611         return;
 612
 613  found:
 614         printk(KERN_INFO PFX "Found a %s style poweroff function\n",
 615                poweroff_functions[i].platform_type);
 616         specific_poweroff_func = poweroff_functions[i].poweroff_func;
 617         old_poweroff_func = pm_power_off;
 618         pm_power_off = ipmi_poweroff_function;
 619         ready = 1;
 620 }
 621
 622 static void ipmi_po_smi_gone(int if_num)
 623 {
 624         if (!ready)
 625                 return;
 626
 627         if (ipmi_ifnum != if_num)
 628                 return;
 629
 630         ready = 0;
 631         ipmi_destroy_user(ipmi_user);
 632         pm_power_off = old_poweroff_func;
 633 }
 634
 635 static struct ipmi_smi_watcher smi_watcher =
 636 {
 637         .owner    = THIS_MODULE,
 638         .new_smi  = ipmi_po_new_smi,
 639         .smi_gone = ipmi_po_smi_gone
 640 };
 641
 642
 643 #ifdef CONFIG_PROC_FS
 644 #include <linux/sysctl.h>
 645
 646 static ctl_table ipmi_table[] = {
 647         { .ctl_name     = DEV_IPMI_POWEROFF_POWERCYCLE,
 648           .procname     = "poweroff_powercycle",
 649           .data         = &poweroff_powercycle,
 650           .maxlen       = sizeof(poweroff_powercycle),
 651           .mode         = 0644,
 652           .proc_handler = &proc_dointvec },
 653         { }
 654 };
 655
 656 static ctl_table ipmi_dir_table[] = {
 657         { .ctl_name     = DEV_IPMI,
 658           .procname     = "ipmi",
 659           .mode         = 0555,
 660           .child        = ipmi_table },
 661         { }
 662 };
 663
 664 static ctl_table ipmi_root_table[] = {
 665         { .ctl_name     = CTL_DEV,
 666           .procname     = "dev",
 667           .mode         = 0555,
 668           .child        = ipmi_dir_table },
 669         { }
 670 };
 671
 672 static struct ctl_table_header *ipmi_table_header;
 673 #endif /* CONFIG_PROC_FS */
 674
 675 /*
 676  * Startup and shutdown functions.
 677  */
 678 static int ipmi_poweroff_init (void)
 679 {
 680         int rv;
 681
 682         printk (KERN_INFO "Copyright (C) 2004 MontaVista Software -"
 683                 " IPMI Powerdown via sys_reboot.\n");
 684
 685         if (poweroff_powercycle)
 686                 printk(KERN_INFO PFX "Power cycle is enabled.\n");
 687
 688 #ifdef CONFIG_PROC_FS
 689         ipmi_table_header = register_sysctl_table(ipmi_root_table);
 690         if (!ipmi_table_header) {
 691                 printk(KERN_ERR PFX "Unable to register powercycle sysctl\n");
 692                 rv = -ENOMEM;
 693                 goto out_err;
 694         }
 695 #endif
 696
 697         rv = ipmi_smi_watcher_register(&smi_watcher);
 698
 699 #ifdef CONFIG_PROC_FS
 700         if (rv) {
 701                 unregister_sysctl_table(ipmi_table_header);
 702                 printk(KERN_ERR PFX "Unable to register SMI watcher: %d\n", rv);
 703                 goto out_err;
 704         }
 705
 706  out_err:
 707 #endif
 708         return rv;
 709 }
 710
 711 #ifdef MODULE
 712 static __exit void ipmi_poweroff_cleanup(void)
 713 {
 714         int rv;
 715
 716 #ifdef CONFIG_PROC_FS
 717         unregister_sysctl_table(ipmi_table_header);
 718 #endif
 719
 720         ipmi_smi_watcher_unregister(&smi_watcher);
 721
 722         if (ready) {
 723                 rv = ipmi_destroy_user(ipmi_user);
 724                 if (rv)
 725                         printk(KERN_ERR PFX "could not cleanup the IPMI"
 726                                " user: 0x%x\n", rv);
 727                 pm_power_off = old_poweroff_func;
 728         }
 729 }
 730 module_exit(ipmi_poweroff_cleanup);
 731 #endif
 732
 733 module_init(ipmi_poweroff_init);
 734 MODULE_LICENSE("GPL");
 735 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
 736 MODULE_DESCRIPTION("IPMI Poweroff extension to sys_reboot");