drivers/watchdog/hpwdt.c

   1 /*
   2  *      HP WatchDog Driver
   3  *      based on
   4  *
   5  *      SoftDog 0.05:   A Software Watchdog Device
   6  *
   7  *      (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
   8  *      Thomas Mingarelli <thomas.mingarelli@hp.com>
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      version 2 as published by the Free Software Foundation
  13  *
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17
  18 #include <linux/device.h>
  19 #include <linux/fs.h>
  20 #include <linux/init.h>
  21 #include <linux/io.h>
  22 #include <linux/bitops.h>
  23 #include <linux/kernel.h>
  24 #include <linux/miscdevice.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/pci.h>
  28 #include <linux/pci_ids.h>
  29 #include <linux/types.h>
  30 #include <linux/uaccess.h>
  31 #include <linux/watchdog.h>
  32 #ifdef CONFIG_HPWDT_NMI_DECODING
  33 #include <linux/dmi.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/nmi.h>
  36 #include <linux/kdebug.h>
  37 #include <linux/notifier.h>
  38 #include <asm/cacheflush.h>
  39 #endif /* CONFIG_HPWDT_NMI_DECODING */
  40 #include <asm/nmi.h>
  41
  42 #define HPWDT_VERSION                   "1.3.2"
  43 #define SECS_TO_TICKS(secs)             ((secs) * 1000 / 128)
  44 #define TICKS_TO_SECS(ticks)            ((ticks) * 128 / 1000)
  45 #define HPWDT_MAX_TIMER                 TICKS_TO_SECS(65535)
  46 #define DEFAULT_MARGIN                  30
  47
  48 static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
  49 static unsigned int reload;                     /* the computed soft_margin */
  50 static bool nowayout = WATCHDOG_NOWAYOUT;
  51 static char expect_release;
  52 static unsigned long hpwdt_is_open;
  53
  54 static void __iomem *pci_mem_addr;              /* the PCI-memory address */
  55 static unsigned long __iomem *hpwdt_timer_reg;
  56 static unsigned long __iomem *hpwdt_timer_con;
  57
  58 static DEFINE_PCI_DEVICE_TABLE(hpwdt_devices) = {
  59         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },   /* iLO2 */
  60         { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },       /* iLO3 */
  61         {0},                    /* terminate list */
  62 };
  63 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
  64
  65 #ifdef CONFIG_HPWDT_NMI_DECODING
  66 #define PCI_BIOS32_SD_VALUE             0x5F32335F      /* "_32_" */
  67 #define CRU_BIOS_SIGNATURE_VALUE        0x55524324
  68 #define PCI_BIOS32_PARAGRAPH_LEN        16
  69 #define PCI_ROM_BASE1                   0x000F0000
  70 #define ROM_SIZE                        0x10000
  71
  72 struct bios32_service_dir {
  73         u32 signature;
  74         u32 entry_point;
  75         u8 revision;
  76         u8 length;
  77         u8 checksum;
  78         u8 reserved[5];
  79 };
  80
  81 /* type 212 */
  82 struct smbios_cru64_info {
  83         u8 type;
  84         u8 byte_length;
  85         u16 handle;
  86         u32 signature;
  87         u64 physical_address;
  88         u32 double_length;
  89         u32 double_offset;
  90 };
  91 #define SMBIOS_CRU64_INFORMATION        212
  92
  93 /* type 219 */
  94 struct smbios_proliant_info {
  95         u8 type;
  96         u8 byte_length;
  97         u16 handle;
  98         u32 power_features;
  99         u32 omega_features;
 100         u32 reserved;
 101         u32 misc_features;
 102 };
 103 #define SMBIOS_ICRU_INFORMATION         219
 104
 105
 106 struct cmn_registers {
 107         union {
 108                 struct {
 109                         u8 ral;
 110                         u8 rah;
 111                         u16 rea2;
 112                 };
 113                 u32 reax;
 114         } u1;
 115         union {
 116                 struct {
 117                         u8 rbl;
 118                         u8 rbh;
 119                         u8 reb2l;
 120                         u8 reb2h;
 121                 };
 122                 u32 rebx;
 123         } u2;
 124         union {
 125                 struct {
 126                         u8 rcl;
 127                         u8 rch;
 128                         u16 rec2;
 129                 };
 130                 u32 recx;
 131         } u3;
 132         union {
 133                 struct {
 134                         u8 rdl;
 135                         u8 rdh;
 136                         u16 red2;
 137                 };
 138                 u32 redx;
 139         } u4;
 140
 141         u32 resi;
 142         u32 redi;
 143         u16 rds;
 144         u16 res;
 145         u32 reflags;
 146 }  __attribute__((packed));
 147
 148 static unsigned int hpwdt_nmi_decoding;
 149 static unsigned int allow_kdump = 1;
 150 static unsigned int is_icru;
 151 static unsigned int is_uefi;
 152 static DEFINE_SPINLOCK(rom_lock);
 153 static void *cru_rom_addr;
 154 static struct cmn_registers cmn_regs;
 155
 156 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
 157                                                 unsigned long *pRomEntry);
 158
 159 #ifdef CONFIG_X86_32
 160 /* --32 Bit Bios------------------------------------------------------------ */
 161
 162 #define HPWDT_ARCH      32
 163
 164 asm(".text                          \n\t"
 165     ".align 4                       \n\t"
 166     ".globl asminline_call          \n"
 167     "asminline_call:                \n\t"
 168     "pushl       %ebp               \n\t"
 169     "movl        %esp, %ebp         \n\t"
 170     "pusha                          \n\t"
 171     "pushf                          \n\t"
 172     "push        %es                \n\t"
 173     "push        %ds                \n\t"
 174     "pop         %es                \n\t"
 175     "movl        8(%ebp),%eax       \n\t"
 176     "movl        4(%eax),%ebx       \n\t"
 177     "movl        8(%eax),%ecx       \n\t"
 178     "movl        12(%eax),%edx      \n\t"
 179     "movl        16(%eax),%esi      \n\t"
 180     "movl        20(%eax),%edi      \n\t"
 181     "movl        (%eax),%eax        \n\t"
 182     "push        %cs                \n\t"
 183     "call        *12(%ebp)          \n\t"
 184     "pushf                          \n\t"
 185     "pushl       %eax               \n\t"
 186     "movl        8(%ebp),%eax       \n\t"
 187     "movl        %ebx,4(%eax)       \n\t"
 188     "movl        %ecx,8(%eax)       \n\t"
 189     "movl        %edx,12(%eax)      \n\t"
 190     "movl        %esi,16(%eax)      \n\t"
 191     "movl        %edi,20(%eax)      \n\t"
 192     "movw        %ds,24(%eax)       \n\t"
 193     "movw        %es,26(%eax)       \n\t"
 194     "popl        %ebx               \n\t"
 195     "movl        %ebx,(%eax)        \n\t"
 196     "popl        %ebx               \n\t"
 197     "movl        %ebx,28(%eax)      \n\t"
 198     "pop         %es                \n\t"
 199     "popf                           \n\t"
 200     "popa                           \n\t"
 201     "leave                          \n\t"
 202     "ret                            \n\t"
 203     ".previous");
 204
 205
 206 /*
 207  *      cru_detect
 208  *
 209  *      Routine Description:
 210  *      This function uses the 32-bit BIOS Service Directory record to
 211  *      search for a $CRU record.
 212  *
 213  *      Return Value:
 214  *      0        :  SUCCESS
 215  *      <0       :  FAILURE
 216  */
 217 static int cru_detect(unsigned long map_entry,
 218         unsigned long map_offset)
 219 {
 220         void *bios32_map;
 221         unsigned long *bios32_entrypoint;
 222         unsigned long cru_physical_address;
 223         unsigned long cru_length;
 224         unsigned long physical_bios_base = 0;
 225         unsigned long physical_bios_offset = 0;
 226         int retval = -ENODEV;
 227
 228         bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
 229
 230         if (bios32_map == NULL)
 231                 return -ENODEV;
 232
 233         bios32_entrypoint = bios32_map + map_offset;
 234
 235         cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
 236
 237         set_memory_x((unsigned long)bios32_map, 2);
 238         asminline_call(&cmn_regs, bios32_entrypoint);
 239
 240         if (cmn_regs.u1.ral != 0) {
 241                 pr_warn("Call succeeded but with an error: 0x%x\n",
 242                         cmn_regs.u1.ral);
 243         } else {
 244                 physical_bios_base = cmn_regs.u2.rebx;
 245                 physical_bios_offset = cmn_regs.u4.redx;
 246                 cru_length = cmn_regs.u3.recx;
 247                 cru_physical_address =
 248                         physical_bios_base + physical_bios_offset;
 249
 250                 /* If the values look OK, then map it in. */
 251                 if ((physical_bios_base + physical_bios_offset)) {
 252                         cru_rom_addr =
 253                                 ioremap(cru_physical_address, cru_length);
 254                         if (cru_rom_addr) {
 255                                 set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
 256                                         (cru_length + PAGE_SIZE - 1) >> PAGE_SHIFT);
 257                                 retval = 0;
 258                         }
 259                 }
 260
 261                 pr_debug("CRU Base Address:   0x%lx\n", physical_bios_base);
 262                 pr_debug("CRU Offset Address: 0x%lx\n", physical_bios_offset);
 263                 pr_debug("CRU Length:         0x%lx\n", cru_length);
 264                 pr_debug("CRU Mapped Address: %p\n", &cru_rom_addr);
 265         }
 266         iounmap(bios32_map);
 267         return retval;
 268 }
 269
 270 /*
 271  *      bios_checksum
 272  */
 273 static int bios_checksum(const char __iomem *ptr, int len)
 274 {
 275         char sum = 0;
 276         int i;
 277
 278         /*
 279          * calculate checksum of size bytes. This should add up
 280          * to zero if we have a valid header.
 281          */
 282         for (i = 0; i < len; i++)
 283                 sum += ptr[i];
 284
 285         return ((sum == 0) && (len > 0));
 286 }
 287
 288 /*
 289  *      bios32_present
 290  *
 291  *      Routine Description:
 292  *      This function finds the 32-bit BIOS Service Directory
 293  *
 294  *      Return Value:
 295  *      0        :  SUCCESS
 296  *      <0       :  FAILURE
 297  */
 298 static int bios32_present(const char __iomem *p)
 299 {
 300         struct bios32_service_dir *bios_32_ptr;
 301         int length;
 302         unsigned long map_entry, map_offset;
 303
 304         bios_32_ptr = (struct bios32_service_dir *) p;
 305
 306         /*
 307          * Search for signature by checking equal to the swizzled value
 308          * instead of calling another routine to perform a strcmp.
 309          */
 310         if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
 311                 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
 312                 if (bios_checksum(p, length)) {
 313                         /*
 314                          * According to the spec, we're looking for the
 315                          * first 4KB-aligned address below the entrypoint
 316                          * listed in the header. The Service Directory code
 317                          * is guaranteed to occupy no more than 2 4KB pages.
 318                          */
 319                         map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
 320                         map_offset = bios_32_ptr->entry_point - map_entry;
 321
 322                         return cru_detect(map_entry, map_offset);
 323                 }
 324         }
 325         return -ENODEV;
 326 }
 327
 328 static int detect_cru_service(void)
 329 {
 330         char __iomem *p, *q;
 331         int rc = -1;
 332
 333         /*
 334          * Search from 0x0f0000 through 0x0fffff, inclusive.
 335          */
 336         p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
 337         if (p == NULL)
 338                 return -ENOMEM;
 339
 340         for (q = p; q < p + ROM_SIZE; q += 16) {
 341                 rc = bios32_present(q);
 342                 if (!rc)
 343                         break;
 344         }
 345         iounmap(p);
 346         return rc;
 347 }
 348 /* ------------------------------------------------------------------------- */
 349 #endif /* CONFIG_X86_32 */
 350 #ifdef CONFIG_X86_64
 351 /* --64 Bit Bios------------------------------------------------------------ */
 352
 353 #define HPWDT_ARCH      64
 354
 355 asm(".text                      \n\t"
 356     ".align 4                   \n\t"
 357     ".globl asminline_call      \n"
 358     "asminline_call:            \n\t"
 359     "pushq      %rbp            \n\t"
 360     "movq       %rsp, %rbp      \n\t"
 361     "pushq      %rax            \n\t"
 362     "pushq      %rbx            \n\t"
 363     "pushq      %rdx            \n\t"
 364     "pushq      %r12            \n\t"
 365     "pushq      %r9             \n\t"
 366     "movq       %rsi, %r12      \n\t"
 367     "movq       %rdi, %r9       \n\t"
 368     "movl       4(%r9),%ebx     \n\t"
 369     "movl       8(%r9),%ecx     \n\t"
 370     "movl       12(%r9),%edx    \n\t"
 371     "movl       16(%r9),%esi    \n\t"
 372     "movl       20(%r9),%edi    \n\t"
 373     "movl       (%r9),%eax      \n\t"
 374     "call       *%r12           \n\t"
 375     "pushfq                     \n\t"
 376     "popq        %r12           \n\t"
 377     "movl       %eax, (%r9)     \n\t"
 378     "movl       %ebx, 4(%r9)    \n\t"
 379     "movl       %ecx, 8(%r9)    \n\t"
 380     "movl       %edx, 12(%r9)   \n\t"
 381     "movl       %esi, 16(%r9)   \n\t"
 382     "movl       %edi, 20(%r9)   \n\t"
 383     "movq       %r12, %rax      \n\t"
 384     "movl       %eax, 28(%r9)   \n\t"
 385     "popq       %r9             \n\t"
 386     "popq       %r12            \n\t"
 387     "popq       %rdx            \n\t"
 388     "popq       %rbx            \n\t"
 389     "popq       %rax            \n\t"
 390     "leave                      \n\t"
 391     "ret                        \n\t"
 392     ".previous");
 393
 394 /*
 395  *      dmi_find_cru
 396  *
 397  *      Routine Description:
 398  *      This function checks whether or not a SMBIOS/DMI record is
 399  *      the 64bit CRU info or not
 400  */
 401 static void dmi_find_cru(const struct dmi_header *dm, void *dummy)
 402 {
 403         struct smbios_cru64_info *smbios_cru64_ptr;
 404         unsigned long cru_physical_address;
 405
 406         if (dm->type == SMBIOS_CRU64_INFORMATION) {
 407                 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
 408                 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
 409                         cru_physical_address =
 410                                 smbios_cru64_ptr->physical_address +
 411                                 smbios_cru64_ptr->double_offset;
 412                         cru_rom_addr = ioremap(cru_physical_address,
 413                                 smbios_cru64_ptr->double_length);
 414                         set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
 415                                 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
 416                 }
 417         }
 418 }
 419
 420 static int detect_cru_service(void)
 421 {
 422         cru_rom_addr = NULL;
 423
 424         dmi_walk(dmi_find_cru, NULL);
 425
 426         /* if cru_rom_addr has been set then we found a CRU service */
 427         return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
 428 }
 429 /* ------------------------------------------------------------------------- */
 430 #endif /* CONFIG_X86_64 */
 431 #endif /* CONFIG_HPWDT_NMI_DECODING */
 432
 433 /*
 434  *      Watchdog operations
 435  */
 436 static void hpwdt_start(void)
 437 {
 438         reload = SECS_TO_TICKS(soft_margin);
 439         iowrite16(reload, hpwdt_timer_reg);
 440         iowrite8(0x85, hpwdt_timer_con);
 441 }
 442
 443 static void hpwdt_stop(void)
 444 {
 445         unsigned long data;
 446
 447         data = ioread8(hpwdt_timer_con);
 448         data &= 0xFE;
 449         iowrite8(data, hpwdt_timer_con);
 450 }
 451
 452 static void hpwdt_ping(void)
 453 {
 454         iowrite16(reload, hpwdt_timer_reg);
 455 }
 456
 457 static int hpwdt_change_timer(int new_margin)
 458 {
 459         if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
 460                 pr_warn("New value passed in is invalid: %d seconds\n",
 461                         new_margin);
 462                 return -EINVAL;
 463         }
 464
 465         soft_margin = new_margin;
 466         pr_debug("New timer passed in is %d seconds\n", new_margin);
 467         reload = SECS_TO_TICKS(soft_margin);
 468
 469         return 0;
 470 }
 471
 472 static int hpwdt_time_left(void)
 473 {
 474         return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
 475 }
 476
 477 #ifdef CONFIG_HPWDT_NMI_DECODING
 478 /*
 479  *      NMI Handler
 480  */
 481 static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
 482 {
 483         unsigned long rom_pl;
 484         static int die_nmi_called;
 485
 486         if (!hpwdt_nmi_decoding)
 487                 goto out;
 488
 489         spin_lock_irqsave(&rom_lock, rom_pl);
 490         if (!die_nmi_called && !is_icru && !is_uefi)
 491                 asminline_call(&cmn_regs, cru_rom_addr);
 492         die_nmi_called = 1;
 493         spin_unlock_irqrestore(&rom_lock, rom_pl);
 494
 495         if (allow_kdump)
 496                 hpwdt_stop();
 497
 498         if (!is_icru && !is_uefi) {
 499                 if (cmn_regs.u1.ral == 0) {
 500                         panic("An NMI occurred, "
 501                                 "but unable to determine source.\n");
 502                 }
 503         }
 504         panic("An NMI occurred, please see the Integrated "
 505                 "Management Log for details.\n");
 506
 507 out:
 508         return NMI_DONE;
 509 }
 510 #endif /* CONFIG_HPWDT_NMI_DECODING */
 511
 512 /*
 513  *      /dev/watchdog handling
 514  */
 515 static int hpwdt_open(struct inode *inode, struct file *file)
 516 {
 517         /* /dev/watchdog can only be opened once */
 518         if (test_and_set_bit(0, &hpwdt_is_open))
 519                 return -EBUSY;
 520
 521         /* Start the watchdog */
 522         hpwdt_start();
 523         hpwdt_ping();
 524
 525         return nonseekable_open(inode, file);
 526 }
 527
 528 static int hpwdt_release(struct inode *inode, struct file *file)
 529 {
 530         /* Stop the watchdog */
 531         if (expect_release == 42) {
 532                 hpwdt_stop();
 533         } else {
 534                 pr_crit("Unexpected close, not stopping watchdog!\n");
 535                 hpwdt_ping();
 536         }
 537
 538         expect_release = 0;
 539
 540         /* /dev/watchdog is being closed, make sure it can be re-opened */
 541         clear_bit(0, &hpwdt_is_open);
 542
 543         return 0;
 544 }
 545
 546 static ssize_t hpwdt_write(struct file *file, const char __user *data,
 547         size_t len, loff_t *ppos)
 548 {
 549         /* See if we got the magic character 'V' and reload the timer */
 550         if (len) {
 551                 if (!nowayout) {
 552                         size_t i;
 553
 554                         /* note: just in case someone wrote the magic character
 555                          * five months ago... */
 556                         expect_release = 0;
 557
 558                         /* scan to see whether or not we got the magic char. */
 559                         for (i = 0; i != len; i++) {
 560                                 char c;
 561                                 if (get_user(c, data + i))
 562                                         return -EFAULT;
 563                                 if (c == 'V')
 564                                         expect_release = 42;
 565                         }
 566                 }
 567
 568                 /* someone wrote to us, we should reload the timer */
 569                 hpwdt_ping();
 570         }
 571
 572         return len;
 573 }
 574
 575 static const struct watchdog_info ident = {
 576         .options = WDIOF_SETTIMEOUT |
 577                    WDIOF_KEEPALIVEPING |
 578                    WDIOF_MAGICCLOSE,
 579         .identity = "HP iLO2+ HW Watchdog Timer",
 580 };
 581
 582 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
 583         unsigned long arg)
 584 {
 585         void __user *argp = (void __user *)arg;
 586         int __user *p = argp;
 587         int new_margin;
 588         int ret = -ENOTTY;
 589
 590         switch (cmd) {
 591         case WDIOC_GETSUPPORT:
 592                 ret = 0;
 593                 if (copy_to_user(argp, &ident, sizeof(ident)))
 594                         ret = -EFAULT;
 595                 break;
 596
 597         case WDIOC_GETSTATUS:
 598         case WDIOC_GETBOOTSTATUS:
 599                 ret = put_user(0, p);
 600                 break;
 601
 602         case WDIOC_KEEPALIVE:
 603                 hpwdt_ping();
 604                 ret = 0;
 605                 break;
 606
 607         case WDIOC_SETTIMEOUT:
 608                 ret = get_user(new_margin, p);
 609                 if (ret)
 610                         break;
 611
 612                 ret = hpwdt_change_timer(new_margin);
 613                 if (ret)
 614                         break;
 615
 616                 hpwdt_ping();
 617                 /* Fall */
 618         case WDIOC_GETTIMEOUT:
 619                 ret = put_user(soft_margin, p);
 620                 break;
 621
 622         case WDIOC_GETTIMELEFT:
 623                 ret = put_user(hpwdt_time_left(), p);
 624                 break;
 625         }
 626         return ret;
 627 }
 628
 629 /*
 630  *      Kernel interfaces
 631  */
 632 static const struct file_operations hpwdt_fops = {
 633         .owner = THIS_MODULE,
 634         .llseek = no_llseek,
 635         .write = hpwdt_write,
 636         .unlocked_ioctl = hpwdt_ioctl,
 637         .open = hpwdt_open,
 638         .release = hpwdt_release,
 639 };
 640
 641 static struct miscdevice hpwdt_miscdev = {
 642         .minor = WATCHDOG_MINOR,
 643         .name = "watchdog",
 644         .fops = &hpwdt_fops,
 645 };
 646
 647 /*
 648  *      Init & Exit
 649  */
 650
 651 #ifdef CONFIG_HPWDT_NMI_DECODING
 652 #ifdef CONFIG_X86_LOCAL_APIC
 653 static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
 654 {
 655         /*
 656          * If nmi_watchdog is turned off then we can turn on
 657          * our nmi decoding capability.
 658          */
 659         hpwdt_nmi_decoding = 1;
 660 }
 661 #else
 662 static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
 663 {
 664         dev_warn(&dev->dev, "NMI decoding is disabled. "
 665                 "Your kernel does not support a NMI Watchdog.\n");
 666 }
 667 #endif /* CONFIG_X86_LOCAL_APIC */
 668
 669 /*
 670  *      dmi_find_icru
 671  *
 672  *      Routine Description:
 673  *      This function checks whether or not we are on an iCRU-based server.
 674  *      This check is independent of architecture and needs to be made for
 675  *      any ProLiant system.
 676  */
 677 static void dmi_find_icru(const struct dmi_header *dm, void *dummy)
 678 {
 679         struct smbios_proliant_info *smbios_proliant_ptr;
 680
 681         if (dm->type == SMBIOS_ICRU_INFORMATION) {
 682                 smbios_proliant_ptr = (struct smbios_proliant_info *) dm;
 683                 if (smbios_proliant_ptr->misc_features & 0x01)
 684                         is_icru = 1;
 685                 if (smbios_proliant_ptr->misc_features & 0x408)
 686                         is_uefi = 1;
 687         }
 688 }
 689
 690 static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
 691 {
 692         int retval;
 693
 694         /*
 695          * On typical CRU-based systems we need to map that service in
 696          * the BIOS. For 32 bit Operating Systems we need to go through
 697          * the 32 Bit BIOS Service Directory. For 64 bit Operating
 698          * Systems we get that service through SMBIOS.
 699          *
 700          * On systems that support the new iCRU service all we need to
 701          * do is call dmi_walk to get the supported flag value and skip
 702          * the old cru detect code.
 703          */
 704         dmi_walk(dmi_find_icru, NULL);
 705         if (!is_icru && !is_uefi) {
 706
 707                 /*
 708                 * We need to map the ROM to get the CRU service.
 709                 * For 32 bit Operating Systems we need to go through the 32 Bit
 710                 * BIOS Service Directory
 711                 * For 64 bit Operating Systems we get that service through SMBIOS.
 712                 */
 713                 retval = detect_cru_service();
 714                 if (retval < 0) {
 715                         dev_warn(&dev->dev,
 716                                 "Unable to detect the %d Bit CRU Service.\n",
 717                                 HPWDT_ARCH);
 718                         return retval;
 719                 }
 720
 721                 /*
 722                 * We know this is the only CRU call we need to make so lets keep as
 723                 * few instructions as possible once the NMI comes in.
 724                 */
 725                 cmn_regs.u1.rah = 0x0D;
 726                 cmn_regs.u1.ral = 0x02;
 727         }
 728
 729         /*
 730          * Only one function can register for NMI_UNKNOWN
 731          */
 732         retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt");
 733         if (retval)
 734                 goto error;
 735         retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt");
 736         if (retval)
 737                 goto error1;
 738         retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt");
 739         if (retval)
 740                 goto error2;
 741
 742         dev_info(&dev->dev,
 743                         "HP Watchdog Timer Driver: NMI decoding initialized"
 744                         ", allow kernel dump: %s (default = 0/OFF)\n",
 745                         (allow_kdump == 0) ? "OFF" : "ON");
 746         return 0;
 747
 748 error2:
 749         unregister_nmi_handler(NMI_SERR, "hpwdt");
 750 error1:
 751         unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
 752 error:
 753         dev_warn(&dev->dev,
 754                 "Unable to register a die notifier (err=%d).\n",
 755                 retval);
 756         if (cru_rom_addr)
 757                 iounmap(cru_rom_addr);
 758         return retval;
 759 }
 760
 761 static void hpwdt_exit_nmi_decoding(void)
 762 {
 763         unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
 764         unregister_nmi_handler(NMI_SERR, "hpwdt");
 765         unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
 766         if (cru_rom_addr)
 767                 iounmap(cru_rom_addr);
 768 }
 769 #else /* !CONFIG_HPWDT_NMI_DECODING */
 770 static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
 771 {
 772 }
 773
 774 static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
 775 {
 776         return 0;
 777 }
 778
 779 static void hpwdt_exit_nmi_decoding(void)
 780 {
 781 }
 782 #endif /* CONFIG_HPWDT_NMI_DECODING */
 783
 784 static int hpwdt_init_one(struct pci_dev *dev,
 785                                         const struct pci_device_id *ent)
 786 {
 787         int retval;
 788
 789         /*
 790          * Check if we can do NMI decoding or not
 791          */
 792         hpwdt_check_nmi_decoding(dev);
 793
 794         /*
 795          * First let's find out if we are on an iLO2+ server. We will
 796          * not run on a legacy ASM box.
 797          * So we only support the G5 ProLiant servers and higher.
 798          */
 799         if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
 800                 dev_warn(&dev->dev,
 801                         "This server does not have an iLO2+ ASIC.\n");
 802                 return -ENODEV;
 803         }
 804
 805         if (pci_enable_device(dev)) {
 806                 dev_warn(&dev->dev,
 807                         "Not possible to enable PCI Device: 0x%x:0x%x.\n",
 808                         ent->vendor, ent->device);
 809                 return -ENODEV;
 810         }
 811
 812         pci_mem_addr = pci_iomap(dev, 1, 0x80);
 813         if (!pci_mem_addr) {
 814                 dev_warn(&dev->dev,
 815                         "Unable to detect the iLO2+ server memory.\n");
 816                 retval = -ENOMEM;
 817                 goto error_pci_iomap;
 818         }
 819         hpwdt_timer_reg = pci_mem_addr + 0x70;
 820         hpwdt_timer_con = pci_mem_addr + 0x72;
 821
 822         /* Make sure that timer is disabled until /dev/watchdog is opened */
 823         hpwdt_stop();
 824
 825         /* Make sure that we have a valid soft_margin */
 826         if (hpwdt_change_timer(soft_margin))
 827                 hpwdt_change_timer(DEFAULT_MARGIN);
 828
 829         /* Initialize NMI Decoding functionality */
 830         retval = hpwdt_init_nmi_decoding(dev);
 831         if (retval != 0)
 832                 goto error_init_nmi_decoding;
 833
 834         retval = misc_register(&hpwdt_miscdev);
 835         if (retval < 0) {
 836                 dev_warn(&dev->dev,
 837                         "Unable to register miscdev on minor=%d (err=%d).\n",
 838                         WATCHDOG_MINOR, retval);
 839                 goto error_misc_register;
 840         }
 841
 842         dev_info(&dev->dev, "HP Watchdog Timer Driver: %s"
 843                         ", timer margin: %d seconds (nowayout=%d).\n",
 844                         HPWDT_VERSION, soft_margin, nowayout);
 845         return 0;
 846
 847 error_misc_register:
 848         hpwdt_exit_nmi_decoding();
 849 error_init_nmi_decoding:
 850         pci_iounmap(dev, pci_mem_addr);
 851 error_pci_iomap:
 852         pci_disable_device(dev);
 853         return retval;
 854 }
 855
 856 static void hpwdt_exit(struct pci_dev *dev)
 857 {
 858         if (!nowayout)
 859                 hpwdt_stop();
 860
 861         misc_deregister(&hpwdt_miscdev);
 862         hpwdt_exit_nmi_decoding();
 863         pci_iounmap(dev, pci_mem_addr);
 864         pci_disable_device(dev);
 865 }
 866
 867 static struct pci_driver hpwdt_driver = {
 868         .name = "hpwdt",
 869         .id_table = hpwdt_devices,
 870         .probe = hpwdt_init_one,
 871         .remove = hpwdt_exit,
 872 };
 873
 874 MODULE_AUTHOR("Tom Mingarelli");
 875 MODULE_DESCRIPTION("hp watchdog driver");
 876 MODULE_LICENSE("GPL");
 877 MODULE_VERSION(HPWDT_VERSION);
 878 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 879
 880 module_param(soft_margin, int, 0);
 881 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
 882
 883 module_param(nowayout, bool, 0);
 884 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 885                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 886
 887 #ifdef CONFIG_HPWDT_NMI_DECODING
 888 module_param(allow_kdump, int, 0);
 889 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
 890 #endif /* !CONFIG_HPWDT_NMI_DECODING */
 891
 892 module_pci_driver(hpwdt_driver);