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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 * HPE WatchDog Driver
3 * based on
4 *
5 * SoftDog 0.05: A Software Watchdog Device
6 *
7 * (c) Copyright 2015 Hewlett Packard Enterprise Development LP
8 * Thomas Mingarelli <thomas.mingarelli@hpe.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/io.h>
21#include <linux/bitops.h>
22#include <linux/kernel.h>
23#include <linux/miscdevice.h>
24#include <linux/module.h>
25#include <linux/moduleparam.h>
26#include <linux/pci.h>
27#include <linux/pci_ids.h>
28#include <linux/types.h>
29#include <linux/uaccess.h>
30#include <linux/watchdog.h>
31#ifdef CONFIG_HPWDT_NMI_DECODING
32#include <linux/dmi.h>
33#include <linux/spinlock.h>
34#include <linux/nmi.h>
35#include <linux/kdebug.h>
36#include <linux/notifier.h>
37#include <asm/cacheflush.h>
38#endif /* CONFIG_HPWDT_NMI_DECODING */
39#include <asm/nmi.h>
40#include <asm/frame.h>
41
42#define HPWDT_VERSION "1.4.0"
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 const struct pci_device_id 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 unsigned int is_uefi;
152static DEFINE_SPINLOCK(rom_lock);
153static void *cru_rom_addr;
154static struct cmn_registers cmn_regs;
155
156extern 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
164asm(".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 */
217static 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 */
273static 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 */
298static 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
328static 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
355asm(".text \n\t"
356 ".align 4 \n\t"
357 ".globl asminline_call \n\t"
358 ".type asminline_call, @function \n\t"
359 "asminline_call: \n\t"
360 FRAME_BEGIN
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 FRAME_END
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 */
401static 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
420static 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 */
436static 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
443static 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
452static void hpwdt_ping(void)
453{
454 iowrite16(reload, hpwdt_timer_reg);
455}
456
457static 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
472static 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 */
481static 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 return NMI_DONE;
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 nmi_panic(regs, "An NMI occurred, but unable to determine source.\n");
501 return NMI_HANDLED;
502 }
503 }
504 nmi_panic(regs, "An NMI occurred. Depending on your system the reason "
505 "for the NMI is logged in any one of the following "
506 "resources:\n"
507 "1. Integrated Management Log (IML)\n"
508 "2. OA Syslog\n"
509 "3. OA Forward Progress Log\n"
510 "4. iLO Event Log");
511
512 return NMI_HANDLED;
513}
514#endif /* CONFIG_HPWDT_NMI_DECODING */
515
516/*
517 * /dev/watchdog handling
518 */
519static int hpwdt_open(struct inode *inode, struct file *file)
520{
521 /* /dev/watchdog can only be opened once */
522 if (test_and_set_bit(0, &hpwdt_is_open))
523 return -EBUSY;
524
525 /* Start the watchdog */
526 hpwdt_start();
527 hpwdt_ping();
528
529 return nonseekable_open(inode, file);
530}
531
532static int hpwdt_release(struct inode *inode, struct file *file)
533{
534 /* Stop the watchdog */
535 if (expect_release == 42) {
536 hpwdt_stop();
537 } else {
538 pr_crit("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 = "HPE 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, options;
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_SETOPTIONS:
612 ret = get_user(options, p);
613 if (ret)
614 break;
615
616 if (options & WDIOS_DISABLECARD)
617 hpwdt_stop();
618
619 if (options & WDIOS_ENABLECARD) {
620 hpwdt_start();
621 hpwdt_ping();
622 }
623 break;
624
625 case WDIOC_SETTIMEOUT:
626 ret = get_user(new_margin, p);
627 if (ret)
628 break;
629
630 ret = hpwdt_change_timer(new_margin);
631 if (ret)
632 break;
633
634 hpwdt_ping();
635 /* Fall */
636 case WDIOC_GETTIMEOUT:
637 ret = put_user(soft_margin, p);
638 break;
639
640 case WDIOC_GETTIMELEFT:
641 ret = put_user(hpwdt_time_left(), p);
642 break;
643 }
644 return ret;
645}
646
647/*
648 * Kernel interfaces
649 */
650static const struct file_operations hpwdt_fops = {
651 .owner = THIS_MODULE,
652 .llseek = no_llseek,
653 .write = hpwdt_write,
654 .unlocked_ioctl = hpwdt_ioctl,
655 .open = hpwdt_open,
656 .release = hpwdt_release,
657};
658
659static struct miscdevice hpwdt_miscdev = {
660 .minor = WATCHDOG_MINOR,
661 .name = "watchdog",
662 .fops = &hpwdt_fops,
663};
664
665/*
666 * Init & Exit
667 */
668
669#ifdef CONFIG_HPWDT_NMI_DECODING
670#ifdef CONFIG_X86_LOCAL_APIC
671static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
672{
673 /*
674 * If nmi_watchdog is turned off then we can turn on
675 * our nmi decoding capability.
676 */
677 hpwdt_nmi_decoding = 1;
678}
679#else
680static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
681{
682 dev_warn(&dev->dev, "NMI decoding is disabled. "
683 "Your kernel does not support a NMI Watchdog.\n");
684}
685#endif /* CONFIG_X86_LOCAL_APIC */
686
687/*
688 * dmi_find_icru
689 *
690 * Routine Description:
691 * This function checks whether or not we are on an iCRU-based server.
692 * This check is independent of architecture and needs to be made for
693 * any ProLiant system.
694 */
695static void dmi_find_icru(const struct dmi_header *dm, void *dummy)
696{
697 struct smbios_proliant_info *smbios_proliant_ptr;
698
699 if (dm->type == SMBIOS_ICRU_INFORMATION) {
700 smbios_proliant_ptr = (struct smbios_proliant_info *) dm;
701 if (smbios_proliant_ptr->misc_features & 0x01)
702 is_icru = 1;
703 if (smbios_proliant_ptr->misc_features & 0x408)
704 is_uefi = 1;
705 }
706}
707
708static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
709{
710 int retval;
711
712 /*
713 * On typical CRU-based systems we need to map that service in
714 * the BIOS. For 32 bit Operating Systems we need to go through
715 * the 32 Bit BIOS Service Directory. For 64 bit Operating
716 * Systems we get that service through SMBIOS.
717 *
718 * On systems that support the new iCRU service all we need to
719 * do is call dmi_walk to get the supported flag value and skip
720 * the old cru detect code.
721 */
722 dmi_walk(dmi_find_icru, NULL);
723 if (!is_icru && !is_uefi) {
724
725 /*
726 * We need to map the ROM to get the CRU service.
727 * For 32 bit Operating Systems we need to go through the 32 Bit
728 * BIOS Service Directory
729 * For 64 bit Operating Systems we get that service through SMBIOS.
730 */
731 retval = detect_cru_service();
732 if (retval < 0) {
733 dev_warn(&dev->dev,
734 "Unable to detect the %d Bit CRU Service.\n",
735 HPWDT_ARCH);
736 return retval;
737 }
738
739 /*
740 * We know this is the only CRU call we need to make so lets keep as
741 * few instructions as possible once the NMI comes in.
742 */
743 cmn_regs.u1.rah = 0x0D;
744 cmn_regs.u1.ral = 0x02;
745 }
746
747 /*
748 * Only one function can register for NMI_UNKNOWN
749 */
750 retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt");
751 if (retval)
752 goto error;
753 retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt");
754 if (retval)
755 goto error1;
756 retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt");
757 if (retval)
758 goto error2;
759
760 dev_info(&dev->dev,
761 "HPE Watchdog Timer Driver: NMI decoding initialized"
762 ", allow kernel dump: %s (default = 1/ON)\n",
763 (allow_kdump == 0) ? "OFF" : "ON");
764 return 0;
765
766error2:
767 unregister_nmi_handler(NMI_SERR, "hpwdt");
768error1:
769 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
770error:
771 dev_warn(&dev->dev,
772 "Unable to register a die notifier (err=%d).\n",
773 retval);
774 if (cru_rom_addr)
775 iounmap(cru_rom_addr);
776 return retval;
777}
778
779static void hpwdt_exit_nmi_decoding(void)
780{
781 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
782 unregister_nmi_handler(NMI_SERR, "hpwdt");
783 unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
784 if (cru_rom_addr)
785 iounmap(cru_rom_addr);
786}
787#else /* !CONFIG_HPWDT_NMI_DECODING */
788static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
789{
790}
791
792static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
793{
794 return 0;
795}
796
797static void hpwdt_exit_nmi_decoding(void)
798{
799}
800#endif /* CONFIG_HPWDT_NMI_DECODING */
801
802static int hpwdt_init_one(struct pci_dev *dev,
803 const struct pci_device_id *ent)
804{
805 int retval;
806
807 /*
808 * Check if we can do NMI decoding or not
809 */
810 hpwdt_check_nmi_decoding(dev);
811
812 /*
813 * First let's find out if we are on an iLO2+ server. We will
814 * not run on a legacy ASM box.
815 * So we only support the G5 ProLiant servers and higher.
816 */
817 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP &&
818 dev->subsystem_vendor != PCI_VENDOR_ID_HP_3PAR) {
819 dev_warn(&dev->dev,
820 "This server does not have an iLO2+ ASIC.\n");
821 return -ENODEV;
822 }
823
824 /*
825 * Ignore all auxilary iLO devices with the following PCI ID
826 */
827 if (dev->subsystem_vendor == PCI_VENDOR_ID_HP &&
828 dev->subsystem_device == 0x1979)
829 return -ENODEV;
830
831 if (pci_enable_device(dev)) {
832 dev_warn(&dev->dev,
833 "Not possible to enable PCI Device: 0x%x:0x%x.\n",
834 ent->vendor, ent->device);
835 return -ENODEV;
836 }
837
838 pci_mem_addr = pci_iomap(dev, 1, 0x80);
839 if (!pci_mem_addr) {
840 dev_warn(&dev->dev,
841 "Unable to detect the iLO2+ server memory.\n");
842 retval = -ENOMEM;
843 goto error_pci_iomap;
844 }
845 hpwdt_timer_reg = pci_mem_addr + 0x70;
846 hpwdt_timer_con = pci_mem_addr + 0x72;
847
848 /* Make sure that timer is disabled until /dev/watchdog is opened */
849 hpwdt_stop();
850
851 /* Make sure that we have a valid soft_margin */
852 if (hpwdt_change_timer(soft_margin))
853 hpwdt_change_timer(DEFAULT_MARGIN);
854
855 /* Initialize NMI Decoding functionality */
856 retval = hpwdt_init_nmi_decoding(dev);
857 if (retval != 0)
858 goto error_init_nmi_decoding;
859
860 retval = misc_register(&hpwdt_miscdev);
861 if (retval < 0) {
862 dev_warn(&dev->dev,
863 "Unable to register miscdev on minor=%d (err=%d).\n",
864 WATCHDOG_MINOR, retval);
865 goto error_misc_register;
866 }
867
868 dev_info(&dev->dev, "HPE Watchdog Timer Driver: %s"
869 ", timer margin: %d seconds (nowayout=%d).\n",
870 HPWDT_VERSION, soft_margin, nowayout);
871 return 0;
872
873error_misc_register:
874 hpwdt_exit_nmi_decoding();
875error_init_nmi_decoding:
876 pci_iounmap(dev, pci_mem_addr);
877error_pci_iomap:
878 pci_disable_device(dev);
879 return retval;
880}
881
882static void hpwdt_exit(struct pci_dev *dev)
883{
884 if (!nowayout)
885 hpwdt_stop();
886
887 misc_deregister(&hpwdt_miscdev);
888 hpwdt_exit_nmi_decoding();
889 pci_iounmap(dev, pci_mem_addr);
890 pci_disable_device(dev);
891}
892
893static struct pci_driver hpwdt_driver = {
894 .name = "hpwdt",
895 .id_table = hpwdt_devices,
896 .probe = hpwdt_init_one,
897 .remove = hpwdt_exit,
898};
899
900MODULE_AUTHOR("Tom Mingarelli");
901MODULE_DESCRIPTION("hp watchdog driver");
902MODULE_LICENSE("GPL");
903MODULE_VERSION(HPWDT_VERSION);
904
905module_param(soft_margin, int, 0);
906MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
907
908module_param(nowayout, bool, 0);
909MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
910 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
911
912#ifdef CONFIG_HPWDT_NMI_DECODING
913module_param(allow_kdump, int, 0);
914MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
915#endif /* !CONFIG_HPWDT_NMI_DECODING */
916
917module_pci_driver(hpwdt_driver);