drivers/char/ipmi/ipmi_poweroff.c

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