Loading...
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
45static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
46static unsigned int reload; /* the computed soft_margin */
47static int nowayout = WATCHDOG_NOWAYOUT;
48static char expect_release;
49static unsigned long hpwdt_is_open;
50
51static void __iomem *pci_mem_addr; /* the PCI-memory address */
52static unsigned long __iomem *hpwdt_timer_reg;
53static unsigned long __iomem *hpwdt_timer_con;
54
55static 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};
60MODULE_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
69struct 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 */
79struct 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 */
91struct 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
103struct 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
145static unsigned int hpwdt_nmi_decoding;
146static unsigned int allow_kdump;
147static unsigned int priority; /* hpwdt at end of die_notify list */
148static unsigned int is_icru;
149static DEFINE_SPINLOCK(rom_lock);
150static void *cru_rom_addr;
151static struct cmn_registers cmn_regs;
152
153extern 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
161asm(".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 */
213static 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 */
270static 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 */
295static 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
325static 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
352asm(".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 */
397static 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
416static 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 */
432static 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
439static 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
448static void hpwdt_ping(void)
449{
450 iowrite16(reload, hpwdt_timer_reg);
451}
452
453static 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
471static 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 */
480static 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
510out:
511 return NOTIFY_OK;
512}
513#endif /* CONFIG_HPWDT_NMI_DECODING */
514
515/*
516 * /dev/watchdog handling
517 */
518static 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
531static 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
550static 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
579static const struct watchdog_info ident = {
580 .options = WDIOF_SETTIMEOUT |
581 WDIOF_KEEPALIVEPING |
582 WDIOF_MAGICCLOSE,
583 .identity = "HP iLO2+ HW Watchdog Timer",
584};
585
586static 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 */
636static 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
645static struct miscdevice hpwdt_miscdev = {
646 .minor = WATCHDOG_MINOR,
647 .name = "watchdog",
648 .fops = &hpwdt_fops,
649};
650
651#ifdef CONFIG_HPWDT_NMI_DECODING
652static 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
664static 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
673static 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 */
688static 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
699static 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
764static 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 */
771static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
772{
773}
774
775static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
776{
777 return 0;
778}
779
780static void hpwdt_exit_nmi_decoding(void)
781{
782}
783#endif /* CONFIG_HPWDT_NMI_DECODING */
784
785static 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
845error_misc_register:
846 hpwdt_exit_nmi_decoding();
847error_init_nmi_decoding:
848 pci_iounmap(dev, pci_mem_addr);
849error_pci_iomap:
850 pci_disable_device(dev);
851 return retval;
852}
853
854static 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
865static 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
872static void __exit hpwdt_cleanup(void)
873{
874 pci_unregister_driver(&hpwdt_driver);
875}
876
877static int __init hpwdt_init(void)
878{
879 return pci_register_driver(&hpwdt_driver);
880}
881
882MODULE_AUTHOR("Tom Mingarelli");
883MODULE_DESCRIPTION("hp watchdog driver");
884MODULE_LICENSE("GPL");
885MODULE_VERSION(HPWDT_VERSION);
886MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
887
888module_param(soft_margin, int, 0);
889MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
890
891module_param(nowayout, int, 0);
892MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
893 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
894
895#ifdef CONFIG_HPWDT_NMI_DECODING
896module_param(allow_kdump, int, 0);
897MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
898
899module_param(priority, int, 0);
900MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last"
901 " (default = 0/Last)\n");
902#endif /* !CONFIG_HPWDT_NMI_DECODING */
903
904module_init(hpwdt_init);
905module_exit(hpwdt_cleanup);
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 "1.3.0"
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
48static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
49static unsigned int reload; /* the computed soft_margin */
50static bool nowayout = WATCHDOG_NOWAYOUT;
51static char expect_release;
52static unsigned long hpwdt_is_open;
53
54static void __iomem *pci_mem_addr; /* the PCI-memory address */
55static unsigned long __iomem *hpwdt_timer_reg;
56static unsigned long __iomem *hpwdt_timer_con;
57
58static 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};
63MODULE_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
72struct 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 */
82struct 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 */
94struct 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
106struct 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
148static unsigned int hpwdt_nmi_decoding;
149static unsigned int allow_kdump = 1;
150static unsigned int is_icru;
151static DEFINE_SPINLOCK(rom_lock);
152static void *cru_rom_addr;
153static struct cmn_registers cmn_regs;
154
155extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
156 unsigned long *pRomEntry);
157
158#ifdef CONFIG_X86_32
159/* --32 Bit Bios------------------------------------------------------------ */
160
161#define HPWDT_ARCH 32
162
163asm(".text \n\t"
164 ".align 4 \n"
165 "asminline_call: \n\t"
166 "pushl %ebp \n\t"
167 "movl %esp, %ebp \n\t"
168 "pusha \n\t"
169 "pushf \n\t"
170 "push %es \n\t"
171 "push %ds \n\t"
172 "pop %es \n\t"
173 "movl 8(%ebp),%eax \n\t"
174 "movl 4(%eax),%ebx \n\t"
175 "movl 8(%eax),%ecx \n\t"
176 "movl 12(%eax),%edx \n\t"
177 "movl 16(%eax),%esi \n\t"
178 "movl 20(%eax),%edi \n\t"
179 "movl (%eax),%eax \n\t"
180 "push %cs \n\t"
181 "call *12(%ebp) \n\t"
182 "pushf \n\t"
183 "pushl %eax \n\t"
184 "movl 8(%ebp),%eax \n\t"
185 "movl %ebx,4(%eax) \n\t"
186 "movl %ecx,8(%eax) \n\t"
187 "movl %edx,12(%eax) \n\t"
188 "movl %esi,16(%eax) \n\t"
189 "movl %edi,20(%eax) \n\t"
190 "movw %ds,24(%eax) \n\t"
191 "movw %es,26(%eax) \n\t"
192 "popl %ebx \n\t"
193 "movl %ebx,(%eax) \n\t"
194 "popl %ebx \n\t"
195 "movl %ebx,28(%eax) \n\t"
196 "pop %es \n\t"
197 "popf \n\t"
198 "popa \n\t"
199 "leave \n\t"
200 "ret \n\t"
201 ".previous");
202
203
204/*
205 * cru_detect
206 *
207 * Routine Description:
208 * This function uses the 32-bit BIOS Service Directory record to
209 * search for a $CRU record.
210 *
211 * Return Value:
212 * 0 : SUCCESS
213 * <0 : FAILURE
214 */
215static int __devinit cru_detect(unsigned long map_entry,
216 unsigned long map_offset)
217{
218 void *bios32_map;
219 unsigned long *bios32_entrypoint;
220 unsigned long cru_physical_address;
221 unsigned long cru_length;
222 unsigned long physical_bios_base = 0;
223 unsigned long physical_bios_offset = 0;
224 int retval = -ENODEV;
225
226 bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
227
228 if (bios32_map == NULL)
229 return -ENODEV;
230
231 bios32_entrypoint = bios32_map + map_offset;
232
233 cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
234
235 set_memory_x((unsigned long)bios32_map, 2);
236 asminline_call(&cmn_regs, bios32_entrypoint);
237
238 if (cmn_regs.u1.ral != 0) {
239 pr_warn("Call succeeded but with an error: 0x%x\n",
240 cmn_regs.u1.ral);
241 } else {
242 physical_bios_base = cmn_regs.u2.rebx;
243 physical_bios_offset = cmn_regs.u4.redx;
244 cru_length = cmn_regs.u3.recx;
245 cru_physical_address =
246 physical_bios_base + physical_bios_offset;
247
248 /* If the values look OK, then map it in. */
249 if ((physical_bios_base + physical_bios_offset)) {
250 cru_rom_addr =
251 ioremap(cru_physical_address, cru_length);
252 if (cru_rom_addr) {
253 set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
254 (cru_length + PAGE_SIZE - 1) >> PAGE_SHIFT);
255 retval = 0;
256 }
257 }
258
259 pr_debug("CRU Base Address: 0x%lx\n", physical_bios_base);
260 pr_debug("CRU Offset Address: 0x%lx\n", physical_bios_offset);
261 pr_debug("CRU Length: 0x%lx\n", cru_length);
262 pr_debug("CRU Mapped Address: %p\n", &cru_rom_addr);
263 }
264 iounmap(bios32_map);
265 return retval;
266}
267
268/*
269 * bios_checksum
270 */
271static int __devinit bios_checksum(const char __iomem *ptr, int len)
272{
273 char sum = 0;
274 int i;
275
276 /*
277 * calculate checksum of size bytes. This should add up
278 * to zero if we have a valid header.
279 */
280 for (i = 0; i < len; i++)
281 sum += ptr[i];
282
283 return ((sum == 0) && (len > 0));
284}
285
286/*
287 * bios32_present
288 *
289 * Routine Description:
290 * This function finds the 32-bit BIOS Service Directory
291 *
292 * Return Value:
293 * 0 : SUCCESS
294 * <0 : FAILURE
295 */
296static int __devinit bios32_present(const char __iomem *p)
297{
298 struct bios32_service_dir *bios_32_ptr;
299 int length;
300 unsigned long map_entry, map_offset;
301
302 bios_32_ptr = (struct bios32_service_dir *) p;
303
304 /*
305 * Search for signature by checking equal to the swizzled value
306 * instead of calling another routine to perform a strcmp.
307 */
308 if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
309 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
310 if (bios_checksum(p, length)) {
311 /*
312 * According to the spec, we're looking for the
313 * first 4KB-aligned address below the entrypoint
314 * listed in the header. The Service Directory code
315 * is guaranteed to occupy no more than 2 4KB pages.
316 */
317 map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
318 map_offset = bios_32_ptr->entry_point - map_entry;
319
320 return cru_detect(map_entry, map_offset);
321 }
322 }
323 return -ENODEV;
324}
325
326static int __devinit detect_cru_service(void)
327{
328 char __iomem *p, *q;
329 int rc = -1;
330
331 /*
332 * Search from 0x0f0000 through 0x0fffff, inclusive.
333 */
334 p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
335 if (p == NULL)
336 return -ENOMEM;
337
338 for (q = p; q < p + ROM_SIZE; q += 16) {
339 rc = bios32_present(q);
340 if (!rc)
341 break;
342 }
343 iounmap(p);
344 return rc;
345}
346/* ------------------------------------------------------------------------- */
347#endif /* CONFIG_X86_32 */
348#ifdef CONFIG_X86_64
349/* --64 Bit Bios------------------------------------------------------------ */
350
351#define HPWDT_ARCH 64
352
353asm(".text \n\t"
354 ".align 4 \n"
355 "asminline_call: \n\t"
356 "pushq %rbp \n\t"
357 "movq %rsp, %rbp \n\t"
358 "pushq %rax \n\t"
359 "pushq %rbx \n\t"
360 "pushq %rdx \n\t"
361 "pushq %r12 \n\t"
362 "pushq %r9 \n\t"
363 "movq %rsi, %r12 \n\t"
364 "movq %rdi, %r9 \n\t"
365 "movl 4(%r9),%ebx \n\t"
366 "movl 8(%r9),%ecx \n\t"
367 "movl 12(%r9),%edx \n\t"
368 "movl 16(%r9),%esi \n\t"
369 "movl 20(%r9),%edi \n\t"
370 "movl (%r9),%eax \n\t"
371 "call *%r12 \n\t"
372 "pushfq \n\t"
373 "popq %r12 \n\t"
374 "movl %eax, (%r9) \n\t"
375 "movl %ebx, 4(%r9) \n\t"
376 "movl %ecx, 8(%r9) \n\t"
377 "movl %edx, 12(%r9) \n\t"
378 "movl %esi, 16(%r9) \n\t"
379 "movl %edi, 20(%r9) \n\t"
380 "movq %r12, %rax \n\t"
381 "movl %eax, 28(%r9) \n\t"
382 "popq %r9 \n\t"
383 "popq %r12 \n\t"
384 "popq %rdx \n\t"
385 "popq %rbx \n\t"
386 "popq %rax \n\t"
387 "leave \n\t"
388 "ret \n\t"
389 ".previous");
390
391/*
392 * dmi_find_cru
393 *
394 * Routine Description:
395 * This function checks whether or not a SMBIOS/DMI record is
396 * the 64bit CRU info or not
397 */
398static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy)
399{
400 struct smbios_cru64_info *smbios_cru64_ptr;
401 unsigned long cru_physical_address;
402
403 if (dm->type == SMBIOS_CRU64_INFORMATION) {
404 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
405 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
406 cru_physical_address =
407 smbios_cru64_ptr->physical_address +
408 smbios_cru64_ptr->double_offset;
409 cru_rom_addr = ioremap(cru_physical_address,
410 smbios_cru64_ptr->double_length);
411 set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
412 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
413 }
414 }
415}
416
417static int __devinit detect_cru_service(void)
418{
419 cru_rom_addr = NULL;
420
421 dmi_walk(dmi_find_cru, NULL);
422
423 /* if cru_rom_addr has been set then we found a CRU service */
424 return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
425}
426/* ------------------------------------------------------------------------- */
427#endif /* CONFIG_X86_64 */
428#endif /* CONFIG_HPWDT_NMI_DECODING */
429
430/*
431 * Watchdog operations
432 */
433static void hpwdt_start(void)
434{
435 reload = SECS_TO_TICKS(soft_margin);
436 iowrite16(reload, hpwdt_timer_reg);
437 iowrite8(0x85, hpwdt_timer_con);
438}
439
440static void hpwdt_stop(void)
441{
442 unsigned long data;
443
444 data = ioread8(hpwdt_timer_con);
445 data &= 0xFE;
446 iowrite8(data, hpwdt_timer_con);
447}
448
449static void hpwdt_ping(void)
450{
451 iowrite16(reload, hpwdt_timer_reg);
452}
453
454static int hpwdt_change_timer(int new_margin)
455{
456 if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
457 pr_warn("New value passed in is invalid: %d seconds\n",
458 new_margin);
459 return -EINVAL;
460 }
461
462 soft_margin = new_margin;
463 pr_debug("New timer passed in is %d seconds\n", new_margin);
464 reload = SECS_TO_TICKS(soft_margin);
465
466 return 0;
467}
468
469static int hpwdt_time_left(void)
470{
471 return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
472}
473
474#ifdef CONFIG_HPWDT_NMI_DECODING
475/*
476 * NMI Handler
477 */
478static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
479{
480 unsigned long rom_pl;
481 static int die_nmi_called;
482
483 if (!hpwdt_nmi_decoding)
484 goto out;
485
486 spin_lock_irqsave(&rom_lock, rom_pl);
487 if (!die_nmi_called && !is_icru)
488 asminline_call(&cmn_regs, cru_rom_addr);
489 die_nmi_called = 1;
490 spin_unlock_irqrestore(&rom_lock, rom_pl);
491
492 if (allow_kdump)
493 hpwdt_stop();
494
495 if (!is_icru) {
496 if (cmn_regs.u1.ral == 0) {
497 panic("An NMI occurred, "
498 "but unable to determine source.\n");
499 }
500 }
501 panic("An NMI occurred, please see the Integrated "
502 "Management Log for details.\n");
503
504out:
505 return NMI_DONE;
506}
507#endif /* CONFIG_HPWDT_NMI_DECODING */
508
509/*
510 * /dev/watchdog handling
511 */
512static int hpwdt_open(struct inode *inode, struct file *file)
513{
514 /* /dev/watchdog can only be opened once */
515 if (test_and_set_bit(0, &hpwdt_is_open))
516 return -EBUSY;
517
518 /* Start the watchdog */
519 hpwdt_start();
520 hpwdt_ping();
521
522 return nonseekable_open(inode, file);
523}
524
525static int hpwdt_release(struct inode *inode, struct file *file)
526{
527 /* Stop the watchdog */
528 if (expect_release == 42) {
529 hpwdt_stop();
530 } else {
531 pr_crit("Unexpected close, not stopping watchdog!\n");
532 hpwdt_ping();
533 }
534
535 expect_release = 0;
536
537 /* /dev/watchdog is being closed, make sure it can be re-opened */
538 clear_bit(0, &hpwdt_is_open);
539
540 return 0;
541}
542
543static ssize_t hpwdt_write(struct file *file, const char __user *data,
544 size_t len, loff_t *ppos)
545{
546 /* See if we got the magic character 'V' and reload the timer */
547 if (len) {
548 if (!nowayout) {
549 size_t i;
550
551 /* note: just in case someone wrote the magic character
552 * five months ago... */
553 expect_release = 0;
554
555 /* scan to see whether or not we got the magic char. */
556 for (i = 0; i != len; i++) {
557 char c;
558 if (get_user(c, data + i))
559 return -EFAULT;
560 if (c == 'V')
561 expect_release = 42;
562 }
563 }
564
565 /* someone wrote to us, we should reload the timer */
566 hpwdt_ping();
567 }
568
569 return len;
570}
571
572static const struct watchdog_info ident = {
573 .options = WDIOF_SETTIMEOUT |
574 WDIOF_KEEPALIVEPING |
575 WDIOF_MAGICCLOSE,
576 .identity = "HP iLO2+ HW Watchdog Timer",
577};
578
579static long hpwdt_ioctl(struct file *file, unsigned int cmd,
580 unsigned long arg)
581{
582 void __user *argp = (void __user *)arg;
583 int __user *p = argp;
584 int new_margin;
585 int ret = -ENOTTY;
586
587 switch (cmd) {
588 case WDIOC_GETSUPPORT:
589 ret = 0;
590 if (copy_to_user(argp, &ident, sizeof(ident)))
591 ret = -EFAULT;
592 break;
593
594 case WDIOC_GETSTATUS:
595 case WDIOC_GETBOOTSTATUS:
596 ret = put_user(0, p);
597 break;
598
599 case WDIOC_KEEPALIVE:
600 hpwdt_ping();
601 ret = 0;
602 break;
603
604 case WDIOC_SETTIMEOUT:
605 ret = get_user(new_margin, p);
606 if (ret)
607 break;
608
609 ret = hpwdt_change_timer(new_margin);
610 if (ret)
611 break;
612
613 hpwdt_ping();
614 /* Fall */
615 case WDIOC_GETTIMEOUT:
616 ret = put_user(soft_margin, p);
617 break;
618
619 case WDIOC_GETTIMELEFT:
620 ret = put_user(hpwdt_time_left(), p);
621 break;
622 }
623 return ret;
624}
625
626/*
627 * Kernel interfaces
628 */
629static const struct file_operations hpwdt_fops = {
630 .owner = THIS_MODULE,
631 .llseek = no_llseek,
632 .write = hpwdt_write,
633 .unlocked_ioctl = hpwdt_ioctl,
634 .open = hpwdt_open,
635 .release = hpwdt_release,
636};
637
638static struct miscdevice hpwdt_miscdev = {
639 .minor = WATCHDOG_MINOR,
640 .name = "watchdog",
641 .fops = &hpwdt_fops,
642};
643
644/*
645 * Init & Exit
646 */
647
648#ifdef CONFIG_HPWDT_NMI_DECODING
649#ifdef CONFIG_X86_LOCAL_APIC
650static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
651{
652 /*
653 * If nmi_watchdog is turned off then we can turn on
654 * our nmi decoding capability.
655 */
656 hpwdt_nmi_decoding = 1;
657}
658#else
659static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
660{
661 dev_warn(&dev->dev, "NMI decoding is disabled. "
662 "Your kernel does not support a NMI Watchdog.\n");
663}
664#endif /* CONFIG_X86_LOCAL_APIC */
665
666/*
667 * dmi_find_icru
668 *
669 * Routine Description:
670 * This function checks whether or not we are on an iCRU-based server.
671 * This check is independent of architecture and needs to be made for
672 * any ProLiant system.
673 */
674static void __devinit dmi_find_icru(const struct dmi_header *dm, void *dummy)
675{
676 struct smbios_proliant_info *smbios_proliant_ptr;
677
678 if (dm->type == SMBIOS_ICRU_INFORMATION) {
679 smbios_proliant_ptr = (struct smbios_proliant_info *) dm;
680 if (smbios_proliant_ptr->misc_features & 0x01)
681 is_icru = 1;
682 }
683}
684
685static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
686{
687 int retval;
688
689 /*
690 * On typical CRU-based systems we need to map that service in
691 * the BIOS. For 32 bit Operating Systems we need to go through
692 * the 32 Bit BIOS Service Directory. For 64 bit Operating
693 * Systems we get that service through SMBIOS.
694 *
695 * On systems that support the new iCRU service all we need to
696 * do is call dmi_walk to get the supported flag value and skip
697 * the old cru detect code.
698 */
699 dmi_walk(dmi_find_icru, NULL);
700 if (!is_icru) {
701
702 /*
703 * We need to map the ROM to get the CRU service.
704 * For 32 bit Operating Systems we need to go through the 32 Bit
705 * BIOS Service Directory
706 * For 64 bit Operating Systems we get that service through SMBIOS.
707 */
708 retval = detect_cru_service();
709 if (retval < 0) {
710 dev_warn(&dev->dev,
711 "Unable to detect the %d Bit CRU Service.\n",
712 HPWDT_ARCH);
713 return retval;
714 }
715
716 /*
717 * We know this is the only CRU call we need to make so lets keep as
718 * few instructions as possible once the NMI comes in.
719 */
720 cmn_regs.u1.rah = 0x0D;
721 cmn_regs.u1.ral = 0x02;
722 }
723
724 /*
725 * Only one function can register for NMI_UNKNOWN
726 */
727 retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt");
728 if (retval)
729 goto error;
730 retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt");
731 if (retval)
732 goto error1;
733 retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt");
734 if (retval)
735 goto error2;
736
737 dev_info(&dev->dev,
738 "HP Watchdog Timer Driver: NMI decoding initialized"
739 ", allow kernel dump: %s (default = 0/OFF)\n",
740 (allow_kdump == 0) ? "OFF" : "ON");
741 return 0;
742
743error2:
744 unregister_nmi_handler(NMI_SERR, "hpwdt");
745error1:
746 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
747error:
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 return retval;
754}
755
756static void hpwdt_exit_nmi_decoding(void)
757{
758 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
759 unregister_nmi_handler(NMI_SERR, "hpwdt");
760 unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
761 if (cru_rom_addr)
762 iounmap(cru_rom_addr);
763}
764#else /* !CONFIG_HPWDT_NMI_DECODING */
765static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
766{
767}
768
769static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
770{
771 return 0;
772}
773
774static void hpwdt_exit_nmi_decoding(void)
775{
776}
777#endif /* CONFIG_HPWDT_NMI_DECODING */
778
779static int __devinit hpwdt_init_one(struct pci_dev *dev,
780 const struct pci_device_id *ent)
781{
782 int retval;
783
784 /*
785 * Check if we can do NMI decoding or not
786 */
787 hpwdt_check_nmi_decoding(dev);
788
789 /*
790 * First let's find out if we are on an iLO2+ server. We will
791 * not run on a legacy ASM box.
792 * So we only support the G5 ProLiant servers and higher.
793 */
794 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
795 dev_warn(&dev->dev,
796 "This server does not have an iLO2+ ASIC.\n");
797 return -ENODEV;
798 }
799
800 if (pci_enable_device(dev)) {
801 dev_warn(&dev->dev,
802 "Not possible to enable PCI Device: 0x%x:0x%x.\n",
803 ent->vendor, ent->device);
804 return -ENODEV;
805 }
806
807 pci_mem_addr = pci_iomap(dev, 1, 0x80);
808 if (!pci_mem_addr) {
809 dev_warn(&dev->dev,
810 "Unable to detect the iLO2+ server memory.\n");
811 retval = -ENOMEM;
812 goto error_pci_iomap;
813 }
814 hpwdt_timer_reg = pci_mem_addr + 0x70;
815 hpwdt_timer_con = pci_mem_addr + 0x72;
816
817 /* Make sure that timer is disabled until /dev/watchdog is opened */
818 hpwdt_stop();
819
820 /* Make sure that we have a valid soft_margin */
821 if (hpwdt_change_timer(soft_margin))
822 hpwdt_change_timer(DEFAULT_MARGIN);
823
824 /* Initialize NMI Decoding functionality */
825 retval = hpwdt_init_nmi_decoding(dev);
826 if (retval != 0)
827 goto error_init_nmi_decoding;
828
829 retval = misc_register(&hpwdt_miscdev);
830 if (retval < 0) {
831 dev_warn(&dev->dev,
832 "Unable to register miscdev on minor=%d (err=%d).\n",
833 WATCHDOG_MINOR, retval);
834 goto error_misc_register;
835 }
836
837 dev_info(&dev->dev, "HP Watchdog Timer Driver: %s"
838 ", timer margin: %d seconds (nowayout=%d).\n",
839 HPWDT_VERSION, soft_margin, nowayout);
840 return 0;
841
842error_misc_register:
843 hpwdt_exit_nmi_decoding();
844error_init_nmi_decoding:
845 pci_iounmap(dev, pci_mem_addr);
846error_pci_iomap:
847 pci_disable_device(dev);
848 return retval;
849}
850
851static void __devexit hpwdt_exit(struct pci_dev *dev)
852{
853 if (!nowayout)
854 hpwdt_stop();
855
856 misc_deregister(&hpwdt_miscdev);
857 hpwdt_exit_nmi_decoding();
858 pci_iounmap(dev, pci_mem_addr);
859 pci_disable_device(dev);
860}
861
862static struct pci_driver hpwdt_driver = {
863 .name = "hpwdt",
864 .id_table = hpwdt_devices,
865 .probe = hpwdt_init_one,
866 .remove = __devexit_p(hpwdt_exit),
867};
868
869MODULE_AUTHOR("Tom Mingarelli");
870MODULE_DESCRIPTION("hp watchdog driver");
871MODULE_LICENSE("GPL");
872MODULE_VERSION(HPWDT_VERSION);
873MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
874
875module_param(soft_margin, int, 0);
876MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
877
878module_param(nowayout, bool, 0);
879MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
880 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
881
882#ifdef CONFIG_HPWDT_NMI_DECODING
883module_param(allow_kdump, int, 0);
884MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
885#endif /* !CONFIG_HPWDT_NMI_DECODING */
886
887module_pci_driver(hpwdt_driver);