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 #include <linux/device.h> 17 #include <linux/fs.h> 18 #include <linux/init.h> 19 #include <linux/io.h> 20 #include <linux/bitops.h> 21 #include <linux/kernel.h> 22 #include <linux/miscdevice.h> 23 #include <linux/module.h> 24 #include <linux/moduleparam.h> 25 #include <linux/pci.h> 26 #include <linux/pci_ids.h> 27 #include <linux/types.h> 28 #include <linux/uaccess.h> 29 #include <linux/watchdog.h> 30 #ifdef CONFIG_HPWDT_NMI_DECODING 31 #include <linux/dmi.h> 32 #include <linux/spinlock.h> 33 #include <linux/nmi.h> 34 #include <linux/kdebug.h> 35 #include <linux/notifier.h> 36 #include <asm/cacheflush.h> 37 #endif /* CONFIG_HPWDT_NMI_DECODING */ 38 39 #define HPWDT_VERSION "1.3.0" 40 #define SECS_TO_TICKS(secs) ((secs) * 1000 / 128) 41 #define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000) 42 #define HPWDT_MAX_TIMER TICKS_TO_SECS(65535) 43 #define DEFAULT_MARGIN 30 44 45 static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */ 46 static unsigned int reload; /* the computed soft_margin */ 47 static int nowayout = WATCHDOG_NOWAYOUT; 48 static char expect_release; 49 static unsigned long hpwdt_is_open; 50 51 static void __iomem *pci_mem_addr; /* the PCI-memory address */ 52 static unsigned long __iomem *hpwdt_timer_reg; 53 static unsigned long __iomem *hpwdt_timer_con; 54 55 static DEFINE_PCI_DEVICE_TABLE(hpwdt_devices) = { 56 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */ 57 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */ 58 {0}, /* terminate list */ 59 }; 60 MODULE_DEVICE_TABLE(pci, hpwdt_devices); 61 62 #ifdef CONFIG_HPWDT_NMI_DECODING 63 #define PCI_BIOS32_SD_VALUE 0x5F32335F /* "_32_" */ 64 #define CRU_BIOS_SIGNATURE_VALUE 0x55524324 65 #define PCI_BIOS32_PARAGRAPH_LEN 16 66 #define PCI_ROM_BASE1 0x000F0000 67 #define ROM_SIZE 0x10000 68 69 struct bios32_service_dir { 70 u32 signature; 71 u32 entry_point; 72 u8 revision; 73 u8 length; 74 u8 checksum; 75 u8 reserved[5]; 76 }; 77 78 /* type 212 */ 79 struct smbios_cru64_info { 80 u8 type; 81 u8 byte_length; 82 u16 handle; 83 u32 signature; 84 u64 physical_address; 85 u32 double_length; 86 u32 double_offset; 87 }; 88 #define SMBIOS_CRU64_INFORMATION 212 89 90 /* type 219 */ 91 struct smbios_proliant_info { 92 u8 type; 93 u8 byte_length; 94 u16 handle; 95 u32 power_features; 96 u32 omega_features; 97 u32 reserved; 98 u32 misc_features; 99 }; 100 #define SMBIOS_ICRU_INFORMATION 219 101 102 103 struct cmn_registers { 104 union { 105 struct { 106 u8 ral; 107 u8 rah; 108 u16 rea2; 109 }; 110 u32 reax; 111 } u1; 112 union { 113 struct { 114 u8 rbl; 115 u8 rbh; 116 u8 reb2l; 117 u8 reb2h; 118 }; 119 u32 rebx; 120 } u2; 121 union { 122 struct { 123 u8 rcl; 124 u8 rch; 125 u16 rec2; 126 }; 127 u32 recx; 128 } u3; 129 union { 130 struct { 131 u8 rdl; 132 u8 rdh; 133 u16 red2; 134 }; 135 u32 redx; 136 } u4; 137 138 u32 resi; 139 u32 redi; 140 u16 rds; 141 u16 res; 142 u32 reflags; 143 } __attribute__((packed)); 144 145 static unsigned int hpwdt_nmi_decoding; 146 static unsigned int allow_kdump; 147 static unsigned int priority; /* hpwdt at end of die_notify list */ 148 static unsigned int is_icru; 149 static DEFINE_SPINLOCK(rom_lock); 150 static void *cru_rom_addr; 151 static struct cmn_registers cmn_regs; 152 153 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, 154 unsigned long *pRomEntry); 155 156 #ifdef CONFIG_X86_32 157 /* --32 Bit Bios------------------------------------------------------------ */ 158 159 #define HPWDT_ARCH 32 160 161 asm(".text \n\t" 162 ".align 4 \n" 163 "asminline_call: \n\t" 164 "pushl %ebp \n\t" 165 "movl %esp, %ebp \n\t" 166 "pusha \n\t" 167 "pushf \n\t" 168 "push %es \n\t" 169 "push %ds \n\t" 170 "pop %es \n\t" 171 "movl 8(%ebp),%eax \n\t" 172 "movl 4(%eax),%ebx \n\t" 173 "movl 8(%eax),%ecx \n\t" 174 "movl 12(%eax),%edx \n\t" 175 "movl 16(%eax),%esi \n\t" 176 "movl 20(%eax),%edi \n\t" 177 "movl (%eax),%eax \n\t" 178 "push %cs \n\t" 179 "call *12(%ebp) \n\t" 180 "pushf \n\t" 181 "pushl %eax \n\t" 182 "movl 8(%ebp),%eax \n\t" 183 "movl %ebx,4(%eax) \n\t" 184 "movl %ecx,8(%eax) \n\t" 185 "movl %edx,12(%eax) \n\t" 186 "movl %esi,16(%eax) \n\t" 187 "movl %edi,20(%eax) \n\t" 188 "movw %ds,24(%eax) \n\t" 189 "movw %es,26(%eax) \n\t" 190 "popl %ebx \n\t" 191 "movl %ebx,(%eax) \n\t" 192 "popl %ebx \n\t" 193 "movl %ebx,28(%eax) \n\t" 194 "pop %es \n\t" 195 "popf \n\t" 196 "popa \n\t" 197 "leave \n\t" 198 "ret \n\t" 199 ".previous"); 200 201 202 /* 203 * cru_detect 204 * 205 * Routine Description: 206 * This function uses the 32-bit BIOS Service Directory record to 207 * search for a $CRU record. 208 * 209 * Return Value: 210 * 0 : SUCCESS 211 * <0 : FAILURE 212 */ 213 static int __devinit cru_detect(unsigned long map_entry, 214 unsigned long map_offset) 215 { 216 void *bios32_map; 217 unsigned long *bios32_entrypoint; 218 unsigned long cru_physical_address; 219 unsigned long cru_length; 220 unsigned long physical_bios_base = 0; 221 unsigned long physical_bios_offset = 0; 222 int retval = -ENODEV; 223 224 bios32_map = ioremap(map_entry, (2 * PAGE_SIZE)); 225 226 if (bios32_map == NULL) 227 return -ENODEV; 228 229 bios32_entrypoint = bios32_map + map_offset; 230 231 cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE; 232 233 asminline_call(&cmn_regs, bios32_entrypoint); 234 235 if (cmn_regs.u1.ral != 0) { 236 printk(KERN_WARNING 237 "hpwdt: Call succeeded but with an error: 0x%x\n", 238 cmn_regs.u1.ral); 239 } else { 240 physical_bios_base = cmn_regs.u2.rebx; 241 physical_bios_offset = cmn_regs.u4.redx; 242 cru_length = cmn_regs.u3.recx; 243 cru_physical_address = 244 physical_bios_base + physical_bios_offset; 245 246 /* If the values look OK, then map it in. */ 247 if ((physical_bios_base + physical_bios_offset)) { 248 cru_rom_addr = 249 ioremap(cru_physical_address, cru_length); 250 if (cru_rom_addr) 251 retval = 0; 252 } 253 254 printk(KERN_DEBUG "hpwdt: CRU Base Address: 0x%lx\n", 255 physical_bios_base); 256 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n", 257 physical_bios_offset); 258 printk(KERN_DEBUG "hpwdt: CRU Length: 0x%lx\n", 259 cru_length); 260 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: %p\n", 261 &cru_rom_addr); 262 } 263 iounmap(bios32_map); 264 return retval; 265 } 266 267 /* 268 * bios_checksum 269 */ 270 static int __devinit bios_checksum(const char __iomem *ptr, int len) 271 { 272 char sum = 0; 273 int i; 274 275 /* 276 * calculate checksum of size bytes. This should add up 277 * to zero if we have a valid header. 278 */ 279 for (i = 0; i < len; i++) 280 sum += ptr[i]; 281 282 return ((sum == 0) && (len > 0)); 283 } 284 285 /* 286 * bios32_present 287 * 288 * Routine Description: 289 * This function finds the 32-bit BIOS Service Directory 290 * 291 * Return Value: 292 * 0 : SUCCESS 293 * <0 : FAILURE 294 */ 295 static int __devinit bios32_present(const char __iomem *p) 296 { 297 struct bios32_service_dir *bios_32_ptr; 298 int length; 299 unsigned long map_entry, map_offset; 300 301 bios_32_ptr = (struct bios32_service_dir *) p; 302 303 /* 304 * Search for signature by checking equal to the swizzled value 305 * instead of calling another routine to perform a strcmp. 306 */ 307 if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) { 308 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN; 309 if (bios_checksum(p, length)) { 310 /* 311 * According to the spec, we're looking for the 312 * first 4KB-aligned address below the entrypoint 313 * listed in the header. The Service Directory code 314 * is guaranteed to occupy no more than 2 4KB pages. 315 */ 316 map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1); 317 map_offset = bios_32_ptr->entry_point - map_entry; 318 319 return cru_detect(map_entry, map_offset); 320 } 321 } 322 return -ENODEV; 323 } 324 325 static int __devinit detect_cru_service(void) 326 { 327 char __iomem *p, *q; 328 int rc = -1; 329 330 /* 331 * Search from 0x0f0000 through 0x0fffff, inclusive. 332 */ 333 p = ioremap(PCI_ROM_BASE1, ROM_SIZE); 334 if (p == NULL) 335 return -ENOMEM; 336 337 for (q = p; q < p + ROM_SIZE; q += 16) { 338 rc = bios32_present(q); 339 if (!rc) 340 break; 341 } 342 iounmap(p); 343 return rc; 344 } 345 /* ------------------------------------------------------------------------- */ 346 #endif /* CONFIG_X86_32 */ 347 #ifdef CONFIG_X86_64 348 /* --64 Bit Bios------------------------------------------------------------ */ 349 350 #define HPWDT_ARCH 64 351 352 asm(".text \n\t" 353 ".align 4 \n" 354 "asminline_call: \n\t" 355 "pushq %rbp \n\t" 356 "movq %rsp, %rbp \n\t" 357 "pushq %rax \n\t" 358 "pushq %rbx \n\t" 359 "pushq %rdx \n\t" 360 "pushq %r12 \n\t" 361 "pushq %r9 \n\t" 362 "movq %rsi, %r12 \n\t" 363 "movq %rdi, %r9 \n\t" 364 "movl 4(%r9),%ebx \n\t" 365 "movl 8(%r9),%ecx \n\t" 366 "movl 12(%r9),%edx \n\t" 367 "movl 16(%r9),%esi \n\t" 368 "movl 20(%r9),%edi \n\t" 369 "movl (%r9),%eax \n\t" 370 "call *%r12 \n\t" 371 "pushfq \n\t" 372 "popq %r12 \n\t" 373 "movl %eax, (%r9) \n\t" 374 "movl %ebx, 4(%r9) \n\t" 375 "movl %ecx, 8(%r9) \n\t" 376 "movl %edx, 12(%r9) \n\t" 377 "movl %esi, 16(%r9) \n\t" 378 "movl %edi, 20(%r9) \n\t" 379 "movq %r12, %rax \n\t" 380 "movl %eax, 28(%r9) \n\t" 381 "popq %r9 \n\t" 382 "popq %r12 \n\t" 383 "popq %rdx \n\t" 384 "popq %rbx \n\t" 385 "popq %rax \n\t" 386 "leave \n\t" 387 "ret \n\t" 388 ".previous"); 389 390 /* 391 * dmi_find_cru 392 * 393 * Routine Description: 394 * This function checks whether or not a SMBIOS/DMI record is 395 * the 64bit CRU info or not 396 */ 397 static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy) 398 { 399 struct smbios_cru64_info *smbios_cru64_ptr; 400 unsigned long cru_physical_address; 401 402 if (dm->type == SMBIOS_CRU64_INFORMATION) { 403 smbios_cru64_ptr = (struct smbios_cru64_info *) dm; 404 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) { 405 cru_physical_address = 406 smbios_cru64_ptr->physical_address + 407 smbios_cru64_ptr->double_offset; 408 cru_rom_addr = ioremap(cru_physical_address, 409 smbios_cru64_ptr->double_length); 410 set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK, 411 smbios_cru64_ptr->double_length >> PAGE_SHIFT); 412 } 413 } 414 } 415 416 static int __devinit detect_cru_service(void) 417 { 418 cru_rom_addr = NULL; 419 420 dmi_walk(dmi_find_cru, NULL); 421 422 /* if cru_rom_addr has been set then we found a CRU service */ 423 return ((cru_rom_addr != NULL) ? 0 : -ENODEV); 424 } 425 /* ------------------------------------------------------------------------- */ 426 #endif /* CONFIG_X86_64 */ 427 #endif /* CONFIG_HPWDT_NMI_DECODING */ 428 429 /* 430 * Watchdog operations 431 */ 432 static void hpwdt_start(void) 433 { 434 reload = SECS_TO_TICKS(soft_margin); 435 iowrite16(reload, hpwdt_timer_reg); 436 iowrite16(0x85, hpwdt_timer_con); 437 } 438 439 static void hpwdt_stop(void) 440 { 441 unsigned long data; 442 443 data = ioread16(hpwdt_timer_con); 444 data &= 0xFE; 445 iowrite16(data, hpwdt_timer_con); 446 } 447 448 static void hpwdt_ping(void) 449 { 450 iowrite16(reload, hpwdt_timer_reg); 451 } 452 453 static int hpwdt_change_timer(int new_margin) 454 { 455 if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) { 456 printk(KERN_WARNING 457 "hpwdt: New value passed in is invalid: %d seconds.\n", 458 new_margin); 459 return -EINVAL; 460 } 461 462 soft_margin = new_margin; 463 printk(KERN_DEBUG 464 "hpwdt: New timer passed in is %d seconds.\n", 465 new_margin); 466 reload = SECS_TO_TICKS(soft_margin); 467 468 return 0; 469 } 470 471 static int hpwdt_time_left(void) 472 { 473 return TICKS_TO_SECS(ioread16(hpwdt_timer_reg)); 474 } 475 476 #ifdef CONFIG_HPWDT_NMI_DECODING 477 /* 478 * NMI Handler 479 */ 480 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason, 481 void *data) 482 { 483 unsigned long rom_pl; 484 static int die_nmi_called; 485 486 if (ulReason != DIE_NMIUNKNOWN) 487 goto out; 488 489 if (!hpwdt_nmi_decoding) 490 goto out; 491 492 spin_lock_irqsave(&rom_lock, rom_pl); 493 if (!die_nmi_called && !is_icru) 494 asminline_call(&cmn_regs, cru_rom_addr); 495 die_nmi_called = 1; 496 spin_unlock_irqrestore(&rom_lock, rom_pl); 497 498 if (allow_kdump) 499 hpwdt_stop(); 500 501 if (!is_icru) { 502 if (cmn_regs.u1.ral == 0) { 503 panic("An NMI occurred, " 504 "but unable to determine source.\n"); 505 } 506 } 507 panic("An NMI occurred, please see the Integrated " 508 "Management Log for details.\n"); 509 510 out: 511 return NOTIFY_OK; 512 } 513 #endif /* CONFIG_HPWDT_NMI_DECODING */ 514 515 /* 516 * /dev/watchdog handling 517 */ 518 static int hpwdt_open(struct inode *inode, struct file *file) 519 { 520 /* /dev/watchdog can only be opened once */ 521 if (test_and_set_bit(0, &hpwdt_is_open)) 522 return -EBUSY; 523 524 /* Start the watchdog */ 525 hpwdt_start(); 526 hpwdt_ping(); 527 528 return nonseekable_open(inode, file); 529 } 530 531 static int hpwdt_release(struct inode *inode, struct file *file) 532 { 533 /* Stop the watchdog */ 534 if (expect_release == 42) { 535 hpwdt_stop(); 536 } else { 537 printk(KERN_CRIT 538 "hpwdt: Unexpected close, not stopping watchdog!\n"); 539 hpwdt_ping(); 540 } 541 542 expect_release = 0; 543 544 /* /dev/watchdog is being closed, make sure it can be re-opened */ 545 clear_bit(0, &hpwdt_is_open); 546 547 return 0; 548 } 549 550 static ssize_t hpwdt_write(struct file *file, const char __user *data, 551 size_t len, loff_t *ppos) 552 { 553 /* See if we got the magic character 'V' and reload the timer */ 554 if (len) { 555 if (!nowayout) { 556 size_t i; 557 558 /* note: just in case someone wrote the magic character 559 * five months ago... */ 560 expect_release = 0; 561 562 /* scan to see whether or not we got the magic char. */ 563 for (i = 0; i != len; i++) { 564 char c; 565 if (get_user(c, data + i)) 566 return -EFAULT; 567 if (c == 'V') 568 expect_release = 42; 569 } 570 } 571 572 /* someone wrote to us, we should reload the timer */ 573 hpwdt_ping(); 574 } 575 576 return len; 577 } 578 579 static const struct watchdog_info ident = { 580 .options = WDIOF_SETTIMEOUT | 581 WDIOF_KEEPALIVEPING | 582 WDIOF_MAGICCLOSE, 583 .identity = "HP iLO2+ HW Watchdog Timer", 584 }; 585 586 static long hpwdt_ioctl(struct file *file, unsigned int cmd, 587 unsigned long arg) 588 { 589 void __user *argp = (void __user *)arg; 590 int __user *p = argp; 591 int new_margin; 592 int ret = -ENOTTY; 593 594 switch (cmd) { 595 case WDIOC_GETSUPPORT: 596 ret = 0; 597 if (copy_to_user(argp, &ident, sizeof(ident))) 598 ret = -EFAULT; 599 break; 600 601 case WDIOC_GETSTATUS: 602 case WDIOC_GETBOOTSTATUS: 603 ret = put_user(0, p); 604 break; 605 606 case WDIOC_KEEPALIVE: 607 hpwdt_ping(); 608 ret = 0; 609 break; 610 611 case WDIOC_SETTIMEOUT: 612 ret = get_user(new_margin, p); 613 if (ret) 614 break; 615 616 ret = hpwdt_change_timer(new_margin); 617 if (ret) 618 break; 619 620 hpwdt_ping(); 621 /* Fall */ 622 case WDIOC_GETTIMEOUT: 623 ret = put_user(soft_margin, p); 624 break; 625 626 case WDIOC_GETTIMELEFT: 627 ret = put_user(hpwdt_time_left(), p); 628 break; 629 } 630 return ret; 631 } 632 633 /* 634 * Kernel interfaces 635 */ 636 static const struct file_operations hpwdt_fops = { 637 .owner = THIS_MODULE, 638 .llseek = no_llseek, 639 .write = hpwdt_write, 640 .unlocked_ioctl = hpwdt_ioctl, 641 .open = hpwdt_open, 642 .release = hpwdt_release, 643 }; 644 645 static struct miscdevice hpwdt_miscdev = { 646 .minor = WATCHDOG_MINOR, 647 .name = "watchdog", 648 .fops = &hpwdt_fops, 649 }; 650 651 #ifdef CONFIG_HPWDT_NMI_DECODING 652 static struct notifier_block die_notifier = { 653 .notifier_call = hpwdt_pretimeout, 654 .priority = 0, 655 }; 656 #endif /* CONFIG_HPWDT_NMI_DECODING */ 657 658 /* 659 * Init & Exit 660 */ 661 662 #ifdef CONFIG_HPWDT_NMI_DECODING 663 #ifdef CONFIG_X86_LOCAL_APIC 664 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev) 665 { 666 /* 667 * If nmi_watchdog is turned off then we can turn on 668 * our nmi decoding capability. 669 */ 670 hpwdt_nmi_decoding = 1; 671 } 672 #else 673 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev) 674 { 675 dev_warn(&dev->dev, "NMI decoding is disabled. " 676 "Your kernel does not support a NMI Watchdog.\n"); 677 } 678 #endif /* CONFIG_X86_LOCAL_APIC */ 679 680 /* 681 * dmi_find_icru 682 * 683 * Routine Description: 684 * This function checks whether or not we are on an iCRU-based server. 685 * This check is independent of architecture and needs to be made for 686 * any ProLiant system. 687 */ 688 static void __devinit dmi_find_icru(const struct dmi_header *dm, void *dummy) 689 { 690 struct smbios_proliant_info *smbios_proliant_ptr; 691 692 if (dm->type == SMBIOS_ICRU_INFORMATION) { 693 smbios_proliant_ptr = (struct smbios_proliant_info *) dm; 694 if (smbios_proliant_ptr->misc_features & 0x01) 695 is_icru = 1; 696 } 697 } 698 699 static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev) 700 { 701 int retval; 702 703 /* 704 * On typical CRU-based systems we need to map that service in 705 * the BIOS. For 32 bit Operating Systems we need to go through 706 * the 32 Bit BIOS Service Directory. For 64 bit Operating 707 * Systems we get that service through SMBIOS. 708 * 709 * On systems that support the new iCRU service all we need to 710 * do is call dmi_walk to get the supported flag value and skip 711 * the old cru detect code. 712 */ 713 dmi_walk(dmi_find_icru, NULL); 714 if (!is_icru) { 715 716 /* 717 * We need to map the ROM to get the CRU service. 718 * For 32 bit Operating Systems we need to go through the 32 Bit 719 * BIOS Service Directory 720 * For 64 bit Operating Systems we get that service through SMBIOS. 721 */ 722 retval = detect_cru_service(); 723 if (retval < 0) { 724 dev_warn(&dev->dev, 725 "Unable to detect the %d Bit CRU Service.\n", 726 HPWDT_ARCH); 727 return retval; 728 } 729 730 /* 731 * We know this is the only CRU call we need to make so lets keep as 732 * few instructions as possible once the NMI comes in. 733 */ 734 cmn_regs.u1.rah = 0x0D; 735 cmn_regs.u1.ral = 0x02; 736 } 737 738 /* 739 * If the priority is set to 1, then we will be put first on the 740 * die notify list to handle a critical NMI. The default is to 741 * be last so other users of the NMI signal can function. 742 */ 743 if (priority) 744 die_notifier.priority = 0x7FFFFFFF; 745 746 retval = register_die_notifier(&die_notifier); 747 if (retval != 0) { 748 dev_warn(&dev->dev, 749 "Unable to register a die notifier (err=%d).\n", 750 retval); 751 if (cru_rom_addr) 752 iounmap(cru_rom_addr); 753 } 754 755 dev_info(&dev->dev, 756 "HP Watchdog Timer Driver: NMI decoding initialized" 757 ", allow kernel dump: %s (default = 0/OFF)" 758 ", priority: %s (default = 0/LAST).\n", 759 (allow_kdump == 0) ? "OFF" : "ON", 760 (priority == 0) ? "LAST" : "FIRST"); 761 return 0; 762 } 763 764 static void hpwdt_exit_nmi_decoding(void) 765 { 766 unregister_die_notifier(&die_notifier); 767 if (cru_rom_addr) 768 iounmap(cru_rom_addr); 769 } 770 #else /* !CONFIG_HPWDT_NMI_DECODING */ 771 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev) 772 { 773 } 774 775 static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev) 776 { 777 return 0; 778 } 779 780 static void hpwdt_exit_nmi_decoding(void) 781 { 782 } 783 #endif /* CONFIG_HPWDT_NMI_DECODING */ 784 785 static int __devinit hpwdt_init_one(struct pci_dev *dev, 786 const struct pci_device_id *ent) 787 { 788 int retval; 789 790 /* 791 * Check if we can do NMI decoding or not 792 */ 793 hpwdt_check_nmi_decoding(dev); 794 795 /* 796 * First let's find out if we are on an iLO2+ server. We will 797 * not run on a legacy ASM box. 798 * So we only support the G5 ProLiant servers and higher. 799 */ 800 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) { 801 dev_warn(&dev->dev, 802 "This server does not have an iLO2+ ASIC.\n"); 803 return -ENODEV; 804 } 805 806 if (pci_enable_device(dev)) { 807 dev_warn(&dev->dev, 808 "Not possible to enable PCI Device: 0x%x:0x%x.\n", 809 ent->vendor, ent->device); 810 return -ENODEV; 811 } 812 813 pci_mem_addr = pci_iomap(dev, 1, 0x80); 814 if (!pci_mem_addr) { 815 dev_warn(&dev->dev, 816 "Unable to detect the iLO2+ server memory.\n"); 817 retval = -ENOMEM; 818 goto error_pci_iomap; 819 } 820 hpwdt_timer_reg = pci_mem_addr + 0x70; 821 hpwdt_timer_con = pci_mem_addr + 0x72; 822 823 /* Make sure that we have a valid soft_margin */ 824 if (hpwdt_change_timer(soft_margin)) 825 hpwdt_change_timer(DEFAULT_MARGIN); 826 827 /* Initialize NMI Decoding functionality */ 828 retval = hpwdt_init_nmi_decoding(dev); 829 if (retval != 0) 830 goto error_init_nmi_decoding; 831 832 retval = misc_register(&hpwdt_miscdev); 833 if (retval < 0) { 834 dev_warn(&dev->dev, 835 "Unable to register miscdev on minor=%d (err=%d).\n", 836 WATCHDOG_MINOR, retval); 837 goto error_misc_register; 838 } 839 840 dev_info(&dev->dev, "HP Watchdog Timer Driver: %s" 841 ", timer margin: %d seconds (nowayout=%d).\n", 842 HPWDT_VERSION, soft_margin, nowayout); 843 return 0; 844 845 error_misc_register: 846 hpwdt_exit_nmi_decoding(); 847 error_init_nmi_decoding: 848 pci_iounmap(dev, pci_mem_addr); 849 error_pci_iomap: 850 pci_disable_device(dev); 851 return retval; 852 } 853 854 static void __devexit hpwdt_exit(struct pci_dev *dev) 855 { 856 if (!nowayout) 857 hpwdt_stop(); 858 859 misc_deregister(&hpwdt_miscdev); 860 hpwdt_exit_nmi_decoding(); 861 pci_iounmap(dev, pci_mem_addr); 862 pci_disable_device(dev); 863 } 864 865 static struct pci_driver hpwdt_driver = { 866 .name = "hpwdt", 867 .id_table = hpwdt_devices, 868 .probe = hpwdt_init_one, 869 .remove = __devexit_p(hpwdt_exit), 870 }; 871 872 static void __exit hpwdt_cleanup(void) 873 { 874 pci_unregister_driver(&hpwdt_driver); 875 } 876 877 static int __init hpwdt_init(void) 878 { 879 return pci_register_driver(&hpwdt_driver); 880 } 881 882 MODULE_AUTHOR("Tom Mingarelli"); 883 MODULE_DESCRIPTION("hp watchdog driver"); 884 MODULE_LICENSE("GPL"); 885 MODULE_VERSION(HPWDT_VERSION); 886 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); 887 888 module_param(soft_margin, int, 0); 889 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds"); 890 891 module_param(nowayout, int, 0); 892 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" 893 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 894 895 #ifdef CONFIG_HPWDT_NMI_DECODING 896 module_param(allow_kdump, int, 0); 897 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs"); 898 899 module_param(priority, int, 0); 900 MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last" 901 " (default = 0/Last)\n"); 902 #endif /* !CONFIG_HPWDT_NMI_DECODING */ 903 904 module_init(hpwdt_init); 905 module_exit(hpwdt_cleanup); 906