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,
  91                  " Set to non-zero to enable power cycle instead of power"
  92                  " down. Power cycle is contingent on hardware support,"
  93                  " otherwise it defaults back to power down.");
  94
  95 /* Stuff from the get device id command. */
  96 static unsigned int mfg_id;
  97 static unsigned int prod_id;
  98 static unsigned char capabilities;
  99 static unsigned char ipmi_version;
 100
 101 /*
 102  * We use our own messages for this operation, we don't let the system
 103  * allocate them, since we may be in a panic situation.  The whole
 104  * thing is single-threaded, anyway, so multiple messages are not
 105  * required.
 106  */
 107 static atomic_t dummy_count = ATOMIC_INIT(0);
 108 static void dummy_smi_free(struct ipmi_smi_msg *msg)
 109 {
 110         atomic_dec(&dummy_count);
 111 }
 112 static void dummy_recv_free(struct ipmi_recv_msg *msg)
 113 {
 114         atomic_dec(&dummy_count);
 115 }
 116 static struct ipmi_smi_msg halt_smi_msg = {
 117         .done = dummy_smi_free
 118 };
 119 static struct ipmi_recv_msg halt_recv_msg = {
 120         .done = dummy_recv_free
 121 };
 122
 123
 124 /*
 125  * Code to send a message and wait for the reponse.
 126  */
 127
 128 static void receive_handler(struct ipmi_recv_msg *recv_msg, void *handler_data)
 129 {
 130         struct completion *comp = recv_msg->user_msg_data;
 131
 132         if (comp)
 133                 complete(comp);
 134 }
 135
 136 static struct ipmi_user_hndl ipmi_poweroff_handler = {
 137         .ipmi_recv_hndl = receive_handler
 138 };
 139
 140
 141 static int ipmi_request_wait_for_response(ipmi_user_t            user,
 142                                           struct ipmi_addr       *addr,
 143                                           struct kernel_ipmi_msg *send_msg)
 144 {
 145         int               rv;
 146         struct completion comp;
 147
 148         init_completion(&comp);
 149
 150         rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, &comp,
 151                                       &halt_smi_msg, &halt_recv_msg, 0);
 152         if (rv)
 153                 return rv;
 154
 155         wait_for_completion(&comp);
 156
 157         return halt_recv_msg.msg.data[0];
 158 }
 159
 160 /* Wait for message to complete, spinning. */
 161 static int ipmi_request_in_rc_mode(ipmi_user_t            user,
 162                                    struct ipmi_addr       *addr,
 163                                    struct kernel_ipmi_msg *send_msg)
 164 {
 165         int rv;
 166
 167         atomic_set(&dummy_count, 2);
 168         rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, NULL,
 169                                       &halt_smi_msg, &halt_recv_msg, 0);
 170         if (rv) {
 171                 atomic_set(&dummy_count, 0);
 172                 return rv;
 173         }
 174
 175         /*
 176          * Spin until our message is done.
 177          */
 178         while (atomic_read(&dummy_count) > 0) {
 179                 ipmi_poll_interface(user);
 180                 cpu_relax();
 181         }
 182
 183         return halt_recv_msg.msg.data[0];
 184 }
 185
 186 /*
 187  * ATCA Support
 188  */
 189
 190 #define IPMI_NETFN_ATCA                 0x2c
 191 #define IPMI_ATCA_SET_POWER_CMD         0x11
 192 #define IPMI_ATCA_GET_ADDR_INFO_CMD     0x01
 193 #define IPMI_PICMG_ID                   0
 194
 195 #define IPMI_NETFN_OEM                          0x2e
 196 #define IPMI_ATCA_PPS_GRACEFUL_RESTART          0x11
 197 #define IPMI_ATCA_PPS_IANA                      "\x00\x40\x0A"
 198 #define IPMI_MOTOROLA_MANUFACTURER_ID           0x0000A1
 199 #define IPMI_MOTOROLA_PPS_IPMC_PRODUCT_ID       0x0051
 200
 201 static void (*atca_oem_poweroff_hook)(ipmi_user_t user);
 202
 203 static void pps_poweroff_atca(ipmi_user_t user)
 204 {
 205         struct ipmi_system_interface_addr smi_addr;
 206         struct kernel_ipmi_msg            send_msg;
 207         int                               rv;
 208         /*
 209          * Configure IPMI address for local access
 210          */
 211         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 212         smi_addr.channel = IPMI_BMC_CHANNEL;
 213         smi_addr.lun = 0;
 214
 215         printk(KERN_INFO PFX "PPS powerdown hook used");
 216
 217         send_msg.netfn = IPMI_NETFN_OEM;
 218         send_msg.cmd = IPMI_ATCA_PPS_GRACEFUL_RESTART;
 219         send_msg.data = IPMI_ATCA_PPS_IANA;
 220         send_msg.data_len = 3;
 221         rv = ipmi_request_in_rc_mode(user,
 222                                      (struct ipmi_addr *) &smi_addr,
 223                                      &send_msg);
 224         if (rv && rv != IPMI_UNKNOWN_ERR_COMPLETION_CODE) {
 225                 printk(KERN_ERR PFX "Unable to send ATCA ,"
 226                        " IPMI error 0x%x\n", rv);
 227         }
 228         return;
 229 }
 230
 231 static int ipmi_atca_detect(ipmi_user_t user)
 232 {
 233         struct ipmi_system_interface_addr smi_addr;
 234         struct kernel_ipmi_msg            send_msg;
 235         int                               rv;
 236         unsigned char                     data[1];
 237
 238         /*
 239          * Configure IPMI address for local access
 240          */
 241         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 242         smi_addr.channel = IPMI_BMC_CHANNEL;
 243         smi_addr.lun = 0;
 244
 245         /*
 246          * Use get address info to check and see if we are ATCA
 247          */
 248         send_msg.netfn = IPMI_NETFN_ATCA;
 249         send_msg.cmd = IPMI_ATCA_GET_ADDR_INFO_CMD;
 250         data[0] = IPMI_PICMG_ID;
 251         send_msg.data = data;
 252         send_msg.data_len = sizeof(data);
 253         rv = ipmi_request_wait_for_response(user,
 254                                             (struct ipmi_addr *) &smi_addr,
 255                                             &send_msg);
 256
 257         printk(KERN_INFO PFX "ATCA Detect mfg 0x%X prod 0x%X\n",
 258                mfg_id, prod_id);
 259         if ((mfg_id == IPMI_MOTOROLA_MANUFACTURER_ID)
 260             && (prod_id == IPMI_MOTOROLA_PPS_IPMC_PRODUCT_ID)) {
 261                 printk(KERN_INFO PFX
 262                        "Installing Pigeon Point Systems Poweroff Hook\n");
 263                 atca_oem_poweroff_hook = pps_poweroff_atca;
 264         }
 265         return !rv;
 266 }
 267
 268 static void ipmi_poweroff_atca(ipmi_user_t user)
 269 {
 270         struct ipmi_system_interface_addr smi_addr;
 271         struct kernel_ipmi_msg            send_msg;
 272         int                               rv;
 273         unsigned char                     data[4];
 274
 275         /*
 276          * Configure IPMI address for local access
 277          */
 278         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 279         smi_addr.channel = IPMI_BMC_CHANNEL;
 280         smi_addr.lun = 0;
 281
 282         printk(KERN_INFO PFX "Powering down via ATCA power command\n");
 283
 284         /*
 285          * Power down
 286          */
 287         send_msg.netfn = IPMI_NETFN_ATCA;
 288         send_msg.cmd = IPMI_ATCA_SET_POWER_CMD;
 289         data[0] = IPMI_PICMG_ID;
 290         data[1] = 0; /* FRU id */
 291         data[2] = 0; /* Power Level */
 292         data[3] = 0; /* Don't change saved presets */
 293         send_msg.data = data;
 294         send_msg.data_len = sizeof(data);
 295         rv = ipmi_request_in_rc_mode(user,
 296                                      (struct ipmi_addr *) &smi_addr,
 297                                      &send_msg);
 298         /*
 299          * At this point, the system may be shutting down, and most
 300          * serial drivers (if used) will have interrupts turned off
 301          * it may be better to ignore IPMI_UNKNOWN_ERR_COMPLETION_CODE
 302          * return code
 303          */
 304         if (rv && rv != IPMI_UNKNOWN_ERR_COMPLETION_CODE) {
 305                 printk(KERN_ERR PFX "Unable to send ATCA powerdown message,"
 306                        " IPMI error 0x%x\n", rv);
 307                 goto out;
 308         }
 309
 310         if (atca_oem_poweroff_hook)
 311                 atca_oem_poweroff_hook(user);
 312  out:
 313         return;
 314 }
 315
 316 /*
 317  * CPI1 Support
 318  */
 319
 320 #define IPMI_NETFN_OEM_1                                0xf8
 321 #define OEM_GRP_CMD_SET_RESET_STATE             0x84
 322 #define OEM_GRP_CMD_SET_POWER_STATE             0x82
 323 #define IPMI_NETFN_OEM_8                                0xf8
 324 #define OEM_GRP_CMD_REQUEST_HOTSWAP_CTRL        0x80
 325 #define OEM_GRP_CMD_GET_SLOT_GA                 0xa3
 326 #define IPMI_NETFN_SENSOR_EVT                   0x10
 327 #define IPMI_CMD_GET_EVENT_RECEIVER             0x01
 328
 329 #define IPMI_CPI1_PRODUCT_ID            0x000157
 330 #define IPMI_CPI1_MANUFACTURER_ID       0x0108
 331
 332 static int ipmi_cpi1_detect(ipmi_user_t user)
 333 {
 334         return ((mfg_id == IPMI_CPI1_MANUFACTURER_ID)
 335                 && (prod_id == IPMI_CPI1_PRODUCT_ID));
 336 }
 337
 338 static void ipmi_poweroff_cpi1(ipmi_user_t user)
 339 {
 340         struct ipmi_system_interface_addr smi_addr;
 341         struct ipmi_ipmb_addr             ipmb_addr;
 342         struct kernel_ipmi_msg            send_msg;
 343         int                               rv;
 344         unsigned char                     data[1];
 345         int                               slot;
 346         unsigned char                     hotswap_ipmb;
 347         unsigned char                     aer_addr;
 348         unsigned char                     aer_lun;
 349
 350         /*
 351          * Configure IPMI address for local access
 352          */
 353         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 354         smi_addr.channel = IPMI_BMC_CHANNEL;
 355         smi_addr.lun = 0;
 356
 357         printk(KERN_INFO PFX "Powering down via CPI1 power command\n");
 358
 359         /*
 360          * Get IPMI ipmb address
 361          */
 362         send_msg.netfn = IPMI_NETFN_OEM_8 >> 2;
 363         send_msg.cmd = OEM_GRP_CMD_GET_SLOT_GA;
 364         send_msg.data = NULL;
 365         send_msg.data_len = 0;
 366         rv = ipmi_request_in_rc_mode(user,
 367                                      (struct ipmi_addr *) &smi_addr,
 368                                      &send_msg);
 369         if (rv)
 370                 goto out;
 371         slot = halt_recv_msg.msg.data[1];
 372         hotswap_ipmb = (slot > 9) ? (0xb0 + 2 * slot) : (0xae + 2 * slot);
 373
 374         /*
 375          * Get active event receiver
 376          */
 377         send_msg.netfn = IPMI_NETFN_SENSOR_EVT >> 2;
 378         send_msg.cmd = IPMI_CMD_GET_EVENT_RECEIVER;
 379         send_msg.data = NULL;
 380         send_msg.data_len = 0;
 381         rv = ipmi_request_in_rc_mode(user,
 382                                      (struct ipmi_addr *) &smi_addr,
 383                                      &send_msg);
 384         if (rv)
 385                 goto out;
 386         aer_addr = halt_recv_msg.msg.data[1];
 387         aer_lun = halt_recv_msg.msg.data[2];
 388
 389         /*
 390          * Setup IPMB address target instead of local target
 391          */
 392         ipmb_addr.addr_type = IPMI_IPMB_ADDR_TYPE;
 393         ipmb_addr.channel = 0;
 394         ipmb_addr.slave_addr = aer_addr;
 395         ipmb_addr.lun = aer_lun;
 396
 397         /*
 398          * Send request hotswap control to remove blade from dpv
 399          */
 400         send_msg.netfn = IPMI_NETFN_OEM_8 >> 2;
 401         send_msg.cmd = OEM_GRP_CMD_REQUEST_HOTSWAP_CTRL;
 402         send_msg.data = &hotswap_ipmb;
 403         send_msg.data_len = 1;
 404         ipmi_request_in_rc_mode(user,
 405                                 (struct ipmi_addr *) &ipmb_addr,
 406                                 &send_msg);
 407
 408         /*
 409          * Set reset asserted
 410          */
 411         send_msg.netfn = IPMI_NETFN_OEM_1 >> 2;
 412         send_msg.cmd = OEM_GRP_CMD_SET_RESET_STATE;
 413         send_msg.data = data;
 414         data[0] = 1; /* Reset asserted state */
 415         send_msg.data_len = 1;
 416         rv = ipmi_request_in_rc_mode(user,
 417                                      (struct ipmi_addr *) &smi_addr,
 418                                      &send_msg);
 419         if (rv)
 420                 goto out;
 421
 422         /*
 423          * Power down
 424          */
 425         send_msg.netfn = IPMI_NETFN_OEM_1 >> 2;
 426         send_msg.cmd = OEM_GRP_CMD_SET_POWER_STATE;
 427         send_msg.data = data;
 428         data[0] = 1; /* Power down state */
 429         send_msg.data_len = 1;
 430         rv = ipmi_request_in_rc_mode(user,
 431                                      (struct ipmi_addr *) &smi_addr,
 432                                      &send_msg);
 433         if (rv)
 434                 goto out;
 435
 436  out:
 437         return;
 438 }
 439
 440 /*
 441  * ipmi_dell_chassis_detect()
 442  * Dell systems with IPMI < 1.5 don't set the chassis capability bit
 443  * but they can handle a chassis poweroff or powercycle command.
 444  */
 445
 446 #define DELL_IANA_MFR_ID {0xA2, 0x02, 0x00}
 447 static int ipmi_dell_chassis_detect(ipmi_user_t user)
 448 {
 449         const char ipmi_version_major = ipmi_version & 0xF;
 450         const char ipmi_version_minor = (ipmi_version >> 4) & 0xF;
 451         const char mfr[3] = DELL_IANA_MFR_ID;
 452         if (!memcmp(mfr, &mfg_id, sizeof(mfr)) &&
 453             ipmi_version_major <= 1 &&
 454             ipmi_version_minor < 5)
 455                 return 1;
 456         return 0;
 457 }
 458
 459 /*
 460  * Standard chassis support
 461  */
 462
 463 #define IPMI_NETFN_CHASSIS_REQUEST      0
 464 #define IPMI_CHASSIS_CONTROL_CMD        0x02
 465
 466 static int ipmi_chassis_detect(ipmi_user_t user)
 467 {
 468         /* Chassis support, use it. */
 469         return (capabilities & 0x80);
 470 }
 471
 472 static void ipmi_poweroff_chassis(ipmi_user_t user)
 473 {
 474         struct ipmi_system_interface_addr smi_addr;
 475         struct kernel_ipmi_msg            send_msg;
 476         int                               rv;
 477         unsigned char                     data[1];
 478
 479         /*
 480          * Configure IPMI address for local access
 481          */
 482         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 483         smi_addr.channel = IPMI_BMC_CHANNEL;
 484         smi_addr.lun = 0;
 485
 486  powercyclefailed:
 487         printk(KERN_INFO PFX "Powering %s via IPMI chassis control command\n",
 488                 (poweroff_powercycle ? "cycle" : "down"));
 489
 490         /*
 491          * Power down
 492          */
 493         send_msg.netfn = IPMI_NETFN_CHASSIS_REQUEST;
 494         send_msg.cmd = IPMI_CHASSIS_CONTROL_CMD;
 495         if (poweroff_powercycle)
 496                 data[0] = IPMI_CHASSIS_POWER_CYCLE;
 497         else
 498                 data[0] = IPMI_CHASSIS_POWER_DOWN;
 499         send_msg.data = data;
 500         send_msg.data_len = sizeof(data);
 501         rv = ipmi_request_in_rc_mode(user,
 502                                      (struct ipmi_addr *) &smi_addr,
 503                                      &send_msg);
 504         if (rv) {
 505                 if (poweroff_powercycle) {
 506                         /* power cycle failed, default to power down */
 507                         printk(KERN_ERR PFX "Unable to send chassis power " \
 508                                "cycle message, IPMI error 0x%x\n", rv);
 509                         poweroff_powercycle = 0;
 510                         goto powercyclefailed;
 511                 }
 512
 513                 printk(KERN_ERR PFX "Unable to send chassis power " \
 514                        "down message, IPMI error 0x%x\n", rv);
 515         }
 516 }
 517
 518
 519 /* Table of possible power off functions. */
 520 struct poweroff_function {
 521         char *platform_type;
 522         int  (*detect)(ipmi_user_t user);
 523         void (*poweroff_func)(ipmi_user_t user);
 524 };
 525
 526 static struct poweroff_function poweroff_functions[] = {
 527         { .platform_type        = "ATCA",
 528           .detect               = ipmi_atca_detect,
 529           .poweroff_func        = ipmi_poweroff_atca },
 530         { .platform_type        = "CPI1",
 531           .detect               = ipmi_cpi1_detect,
 532           .poweroff_func        = ipmi_poweroff_cpi1 },
 533         { .platform_type        = "chassis",
 534           .detect               = ipmi_dell_chassis_detect,
 535           .poweroff_func        = ipmi_poweroff_chassis },
 536         /* Chassis should generally be last, other things should override
 537            it. */
 538         { .platform_type        = "chassis",
 539           .detect               = ipmi_chassis_detect,
 540           .poweroff_func        = ipmi_poweroff_chassis },
 541 };
 542 #define NUM_PO_FUNCS (sizeof(poweroff_functions) \
 543                       / sizeof(struct poweroff_function))
 544
 545
 546 /* Called on a powerdown request. */
 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. */
 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
 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 ctl_table ipmi_table[] = {
 663         { .ctl_name     = DEV_IPMI_POWEROFF_POWERCYCLE,
 664           .procname     = "poweroff_powercycle",
 665           .data         = &poweroff_powercycle,
 666           .maxlen       = sizeof(poweroff_powercycle),
 667           .mode         = 0644,
 668           .proc_handler = &proc_dointvec },
 669         { }
 670 };
 671
 672 static ctl_table ipmi_dir_table[] = {
 673         { .ctl_name     = DEV_IPMI,
 674           .procname     = "ipmi",
 675           .mode         = 0555,
 676           .child        = ipmi_table },
 677         { }
 678 };
 679
 680 static ctl_table ipmi_root_table[] = {
 681         { .ctl_name     = CTL_DEV,
 682           .procname     = "dev",
 683           .mode         = 0555,
 684           .child        = ipmi_dir_table },
 685         { }
 686 };
 687
 688 static struct ctl_table_header *ipmi_table_header;
 689 #endif /* CONFIG_PROC_FS */
 690
 691 /*
 692  * Startup and shutdown functions.
 693  */
 694 static int __init ipmi_poweroff_init(void)
 695 {
 696         int rv;
 697
 698         printk(KERN_INFO "Copyright (C) 2004 MontaVista Software -"
 699                " IPMI Powerdown via sys_reboot.\n");
 700
 701         if (poweroff_powercycle)
 702                 printk(KERN_INFO PFX "Power cycle is enabled.\n");
 703
 704 #ifdef CONFIG_PROC_FS
 705         ipmi_table_header = register_sysctl_table(ipmi_root_table);
 706         if (!ipmi_table_header) {
 707                 printk(KERN_ERR PFX "Unable to register powercycle sysctl\n");
 708                 rv = -ENOMEM;
 709                 goto out_err;
 710         }
 711 #endif
 712
 713         rv = ipmi_smi_watcher_register(&smi_watcher);
 714
 715 #ifdef CONFIG_PROC_FS
 716         if (rv) {
 717                 unregister_sysctl_table(ipmi_table_header);
 718                 printk(KERN_ERR PFX "Unable to register SMI watcher: %d\n", rv);
 719                 goto out_err;
 720         }
 721
 722  out_err:
 723 #endif
 724         return rv;
 725 }
 726
 727 #ifdef MODULE
 728 static void __exit ipmi_poweroff_cleanup(void)
 729 {
 730         int rv;
 731
 732 #ifdef CONFIG_PROC_FS
 733         unregister_sysctl_table(ipmi_table_header);
 734 #endif
 735
 736         ipmi_smi_watcher_unregister(&smi_watcher);
 737
 738         if (ready) {
 739                 rv = ipmi_destroy_user(ipmi_user);
 740                 if (rv)
 741                         printk(KERN_ERR PFX "could not cleanup the IPMI"
 742                                " user: 0x%x\n", rv);
 743                 pm_power_off = old_poweroff_func;
 744         }
 745 }
 746 module_exit(ipmi_poweroff_cleanup);
 747 #endif
 748
 749 module_init(ipmi_poweroff_init);
 750 MODULE_LICENSE("GPL");
 751 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
 752 MODULE_DESCRIPTION("IPMI Poweroff extension to sys_reboot");