blob: 8cb26855bfede30eeb6782f693a29add442cdaa1 [file] [log] [blame]
Thomas Mingarelli7f4da472007-12-04 17:41:54 +00001/*
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>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000019#include <linux/io.h>
dann fraziera52e6d12010-07-27 17:50:50 -060020#include <linux/bitops.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000021#include <linux/kernel.h>
22#include <linux/miscdevice.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000023#include <linux/module.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000024#include <linux/moduleparam.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000025#include <linux/pci.h>
26#include <linux/pci_ids.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000027#include <linux/types.h>
28#include <linux/uaccess.h>
29#include <linux/watchdog.h>
dann frazier86ded1f2010-07-27 17:51:02 -060030#ifdef CONFIG_HPWDT_NMI_DECODING
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000031#include <linux/dmi.h>
dann fraziera52e6d12010-07-27 17:50:50 -060032#include <linux/spinlock.h>
dann frazier923410d2010-07-27 17:50:54 -060033#include <linux/nmi.h>
34#include <linux/kdebug.h>
35#include <linux/notifier.h>
Bernhard Walle06026412008-11-14 15:47:03 +010036#include <asm/cacheflush.h>
dann frazier86ded1f2010-07-27 17:51:02 -060037#endif /* CONFIG_HPWDT_NMI_DECODING */
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000038
dann frazier86ded1f2010-07-27 17:51:02 -060039#define HPWDT_VERSION "1.2.0"
dann fraziere802e322010-06-02 16:23:39 -060040#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
dann frazier6f681c22010-06-02 16:23:40 -060041#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
42#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)
dann frazier923410d2010-07-27 17:50:54 -060043#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
Wim Van Sebroeck4562f532011-02-21 12:16:44 +000055static DEFINE_PCI_DEVICE_TABLE(hpwdt_devices) = {
dann frazier36e3ff42010-07-27 17:50:57 -060056 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */
57 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */
dann frazier923410d2010-07-27 17:50:54 -060058 {0}, /* terminate list */
59};
60MODULE_DEVICE_TABLE(pci, hpwdt_devices);
61
dann frazier86ded1f2010-07-27 17:51:02 -060062#ifdef CONFIG_HPWDT_NMI_DECODING
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000063#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
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000078/* 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
90struct cmn_registers {
91 union {
92 struct {
93 u8 ral;
94 u8 rah;
95 u16 rea2;
96 };
97 u32 reax;
98 } u1;
99 union {
100 struct {
101 u8 rbl;
102 u8 rbh;
103 u8 reb2l;
104 u8 reb2h;
105 };
106 u32 rebx;
107 } u2;
108 union {
109 struct {
110 u8 rcl;
111 u8 rch;
112 u16 rec2;
113 };
114 u32 recx;
115 } u3;
116 union {
117 struct {
118 u8 rdl;
119 u8 rdh;
120 u16 red2;
121 };
122 u32 redx;
123 } u4;
124
125 u32 resi;
126 u32 redi;
127 u16 rds;
128 u16 res;
129 u32 reflags;
130} __attribute__((packed));
131
dann frazier34572b22010-07-27 17:51:01 -0600132static unsigned int hpwdt_nmi_decoding;
dann frazier923410d2010-07-27 17:50:54 -0600133static unsigned int allow_kdump;
Tom Mingarelli44df7532009-06-18 23:28:57 +0000134static unsigned int priority; /* hpwdt at end of die_notify list */
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000135static DEFINE_SPINLOCK(rom_lock);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000136static void *cru_rom_addr;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000137static struct cmn_registers cmn_regs;
138
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +0000139extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
140 unsigned long *pRomEntry);
Linus Torvalds1f6ef2342008-06-20 12:19:28 -0700141
dann frazier6b7f3d52010-07-27 17:50:59 -0600142#ifdef CONFIG_X86_32
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000143/* --32 Bit Bios------------------------------------------------------------ */
144
145#define HPWDT_ARCH 32
146
Linus Torvalds1f6ef2342008-06-20 12:19:28 -0700147asm(".text \n\t"
148 ".align 4 \n"
149 "asminline_call: \n\t"
150 "pushl %ebp \n\t"
151 "movl %esp, %ebp \n\t"
152 "pusha \n\t"
153 "pushf \n\t"
154 "push %es \n\t"
155 "push %ds \n\t"
156 "pop %es \n\t"
157 "movl 8(%ebp),%eax \n\t"
158 "movl 4(%eax),%ebx \n\t"
159 "movl 8(%eax),%ecx \n\t"
160 "movl 12(%eax),%edx \n\t"
161 "movl 16(%eax),%esi \n\t"
162 "movl 20(%eax),%edi \n\t"
163 "movl (%eax),%eax \n\t"
164 "push %cs \n\t"
165 "call *12(%ebp) \n\t"
166 "pushf \n\t"
167 "pushl %eax \n\t"
168 "movl 8(%ebp),%eax \n\t"
169 "movl %ebx,4(%eax) \n\t"
170 "movl %ecx,8(%eax) \n\t"
171 "movl %edx,12(%eax) \n\t"
172 "movl %esi,16(%eax) \n\t"
173 "movl %edi,20(%eax) \n\t"
174 "movw %ds,24(%eax) \n\t"
175 "movw %es,26(%eax) \n\t"
176 "popl %ebx \n\t"
177 "movl %ebx,(%eax) \n\t"
178 "popl %ebx \n\t"
179 "movl %ebx,28(%eax) \n\t"
180 "pop %es \n\t"
181 "popf \n\t"
182 "popa \n\t"
183 "leave \n\t"
184 "ret \n\t"
185 ".previous");
186
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000187
188/*
189 * cru_detect
190 *
191 * Routine Description:
192 * This function uses the 32-bit BIOS Service Directory record to
193 * search for a $CRU record.
194 *
195 * Return Value:
196 * 0 : SUCCESS
197 * <0 : FAILURE
198 */
199static int __devinit cru_detect(unsigned long map_entry,
200 unsigned long map_offset)
201{
202 void *bios32_map;
203 unsigned long *bios32_entrypoint;
204 unsigned long cru_physical_address;
205 unsigned long cru_length;
206 unsigned long physical_bios_base = 0;
207 unsigned long physical_bios_offset = 0;
208 int retval = -ENODEV;
209
210 bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
211
212 if (bios32_map == NULL)
213 return -ENODEV;
214
215 bios32_entrypoint = bios32_map + map_offset;
216
217 cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
218
219 asminline_call(&cmn_regs, bios32_entrypoint);
220
221 if (cmn_regs.u1.ral != 0) {
222 printk(KERN_WARNING
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000223 "hpwdt: Call succeeded but with an error: 0x%x\n",
224 cmn_regs.u1.ral);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000225 } else {
226 physical_bios_base = cmn_regs.u2.rebx;
227 physical_bios_offset = cmn_regs.u4.redx;
228 cru_length = cmn_regs.u3.recx;
229 cru_physical_address =
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000230 physical_bios_base + physical_bios_offset;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000231
232 /* If the values look OK, then map it in. */
233 if ((physical_bios_base + physical_bios_offset)) {
234 cru_rom_addr =
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000235 ioremap(cru_physical_address, cru_length);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000236 if (cru_rom_addr)
237 retval = 0;
238 }
239
240 printk(KERN_DEBUG "hpwdt: CRU Base Address: 0x%lx\n",
241 physical_bios_base);
242 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
243 physical_bios_offset);
244 printk(KERN_DEBUG "hpwdt: CRU Length: 0x%lx\n",
245 cru_length);
Kulikov Vasiliyadb23632010-07-14 22:06:30 +0400246 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: %p\n",
247 &cru_rom_addr);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000248 }
249 iounmap(bios32_map);
250 return retval;
251}
252
253/*
Roland Dreier30ec9102008-02-28 12:34:42 -0800254 * bios_checksum
255 */
256static int __devinit bios_checksum(const char __iomem *ptr, int len)
257{
258 char sum = 0;
259 int i;
260
261 /*
262 * calculate checksum of size bytes. This should add up
263 * to zero if we have a valid header.
264 */
265 for (i = 0; i < len; i++)
266 sum += ptr[i];
267
268 return ((sum == 0) && (len > 0));
269}
270
271/*
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000272 * bios32_present
273 *
274 * Routine Description:
275 * This function finds the 32-bit BIOS Service Directory
276 *
277 * Return Value:
278 * 0 : SUCCESS
279 * <0 : FAILURE
280 */
281static int __devinit bios32_present(const char __iomem *p)
282{
283 struct bios32_service_dir *bios_32_ptr;
284 int length;
285 unsigned long map_entry, map_offset;
286
287 bios_32_ptr = (struct bios32_service_dir *) p;
288
289 /*
290 * Search for signature by checking equal to the swizzled value
291 * instead of calling another routine to perform a strcmp.
292 */
293 if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
294 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
295 if (bios_checksum(p, length)) {
296 /*
297 * According to the spec, we're looking for the
298 * first 4KB-aligned address below the entrypoint
299 * listed in the header. The Service Directory code
300 * is guaranteed to occupy no more than 2 4KB pages.
301 */
302 map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
303 map_offset = bios_32_ptr->entry_point - map_entry;
304
305 return cru_detect(map_entry, map_offset);
306 }
307 }
308 return -ENODEV;
309}
310
311static int __devinit detect_cru_service(void)
312{
313 char __iomem *p, *q;
314 int rc = -1;
315
316 /*
317 * Search from 0x0f0000 through 0x0fffff, inclusive.
318 */
319 p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
320 if (p == NULL)
321 return -ENOMEM;
322
323 for (q = p; q < p + ROM_SIZE; q += 16) {
324 rc = bios32_present(q);
325 if (!rc)
326 break;
327 }
328 iounmap(p);
329 return rc;
330}
dann frazier6b7f3d52010-07-27 17:50:59 -0600331/* ------------------------------------------------------------------------- */
332#endif /* CONFIG_X86_32 */
333#ifdef CONFIG_X86_64
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000334/* --64 Bit Bios------------------------------------------------------------ */
335
336#define HPWDT_ARCH 64
337
Linus Torvalds1f6ef2342008-06-20 12:19:28 -0700338asm(".text \n\t"
339 ".align 4 \n"
340 "asminline_call: \n\t"
341 "pushq %rbp \n\t"
342 "movq %rsp, %rbp \n\t"
343 "pushq %rax \n\t"
344 "pushq %rbx \n\t"
345 "pushq %rdx \n\t"
346 "pushq %r12 \n\t"
347 "pushq %r9 \n\t"
348 "movq %rsi, %r12 \n\t"
349 "movq %rdi, %r9 \n\t"
350 "movl 4(%r9),%ebx \n\t"
351 "movl 8(%r9),%ecx \n\t"
352 "movl 12(%r9),%edx \n\t"
353 "movl 16(%r9),%esi \n\t"
354 "movl 20(%r9),%edi \n\t"
355 "movl (%r9),%eax \n\t"
356 "call *%r12 \n\t"
357 "pushfq \n\t"
358 "popq %r12 \n\t"
Linus Torvalds1f6ef2342008-06-20 12:19:28 -0700359 "movl %eax, (%r9) \n\t"
360 "movl %ebx, 4(%r9) \n\t"
361 "movl %ecx, 8(%r9) \n\t"
362 "movl %edx, 12(%r9) \n\t"
363 "movl %esi, 16(%r9) \n\t"
364 "movl %edi, 20(%r9) \n\t"
365 "movq %r12, %rax \n\t"
366 "movl %eax, 28(%r9) \n\t"
367 "popq %r9 \n\t"
368 "popq %r12 \n\t"
369 "popq %rdx \n\t"
370 "popq %rbx \n\t"
371 "popq %rax \n\t"
372 "leave \n\t"
373 "ret \n\t"
374 ".previous");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000375
376/*
377 * dmi_find_cru
378 *
379 * Routine Description:
Roland Dreier30ec9102008-02-28 12:34:42 -0800380 * This function checks whether or not a SMBIOS/DMI record is
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000381 * the 64bit CRU info or not
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000382 */
Jean Delvaree7a19c562009-03-30 21:46:44 +0200383static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy)
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000384{
385 struct smbios_cru64_info *smbios_cru64_ptr;
386 unsigned long cru_physical_address;
387
388 if (dm->type == SMBIOS_CRU64_INFORMATION) {
389 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
390 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
391 cru_physical_address =
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000392 smbios_cru64_ptr->physical_address +
393 smbios_cru64_ptr->double_offset;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000394 cru_rom_addr = ioremap(cru_physical_address,
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000395 smbios_cru64_ptr->double_length);
Bernhard Walle06026412008-11-14 15:47:03 +0100396 set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
397 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000398 }
399 }
400}
401
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000402static int __devinit detect_cru_service(void)
403{
404 cru_rom_addr = NULL;
405
Jean Delvaree7a19c562009-03-30 21:46:44 +0200406 dmi_walk(dmi_find_cru, NULL);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000407
408 /* if cru_rom_addr has been set then we found a CRU service */
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000409 return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000410}
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000411/* ------------------------------------------------------------------------- */
dann frazier6b7f3d52010-07-27 17:50:59 -0600412#endif /* CONFIG_X86_64 */
dann frazier86ded1f2010-07-27 17:51:02 -0600413#endif /* CONFIG_HPWDT_NMI_DECODING */
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000414
415/*
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000416 * Watchdog operations
417 */
418static void hpwdt_start(void)
419{
dann fraziere802e322010-06-02 16:23:39 -0600420 reload = SECS_TO_TICKS(soft_margin);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000421 iowrite16(reload, hpwdt_timer_reg);
422 iowrite16(0x85, hpwdt_timer_con);
423}
424
425static void hpwdt_stop(void)
426{
427 unsigned long data;
428
429 data = ioread16(hpwdt_timer_con);
430 data &= 0xFE;
431 iowrite16(data, hpwdt_timer_con);
432}
433
434static void hpwdt_ping(void)
435{
436 iowrite16(reload, hpwdt_timer_reg);
437}
438
439static int hpwdt_change_timer(int new_margin)
440{
dann frazier6f681c22010-06-02 16:23:40 -0600441 if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000442 printk(KERN_WARNING
443 "hpwdt: New value passed in is invalid: %d seconds.\n",
444 new_margin);
445 return -EINVAL;
446 }
447
448 soft_margin = new_margin;
449 printk(KERN_DEBUG
450 "hpwdt: New timer passed in is %d seconds.\n",
451 new_margin);
dann fraziere802e322010-06-02 16:23:39 -0600452 reload = SECS_TO_TICKS(soft_margin);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000453
454 return 0;
455}
456
dann frazieraae67f32010-06-02 16:23:41 -0600457static int hpwdt_time_left(void)
458{
459 return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
460}
461
dann frazier86ded1f2010-07-27 17:51:02 -0600462#ifdef CONFIG_HPWDT_NMI_DECODING
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000463/*
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000464 * NMI Handler
465 */
466static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
467 void *data)
468{
469 unsigned long rom_pl;
470 static int die_nmi_called;
471
Don Zickus673a6092011-01-06 16:18:48 -0500472 if (ulReason != DIE_NMIUNKNOWN)
dann frazier243066b2010-07-27 17:50:49 -0600473 goto out;
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000474
dann frazier34572b22010-07-27 17:51:01 -0600475 if (!hpwdt_nmi_decoding)
dann frazier243066b2010-07-27 17:50:49 -0600476 goto out;
477
478 spin_lock_irqsave(&rom_lock, rom_pl);
479 if (!die_nmi_called)
480 asminline_call(&cmn_regs, cru_rom_addr);
481 die_nmi_called = 1;
482 spin_unlock_irqrestore(&rom_lock, rom_pl);
483 if (cmn_regs.u1.ral == 0) {
484 printk(KERN_WARNING "hpwdt: An NMI occurred, "
485 "but unable to determine source.\n");
486 } else {
487 if (allow_kdump)
488 hpwdt_stop();
489 panic("An NMI occurred, please see the Integrated "
490 "Management Log for details.\n");
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000491 }
dann frazier243066b2010-07-27 17:50:49 -0600492out:
Bernhard Walle290172e2008-10-26 15:59:37 +0100493 return NOTIFY_OK;
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000494}
dann frazier86ded1f2010-07-27 17:51:02 -0600495#endif /* CONFIG_HPWDT_NMI_DECODING */
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000496
497/*
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000498 * /dev/watchdog handling
499 */
500static int hpwdt_open(struct inode *inode, struct file *file)
501{
502 /* /dev/watchdog can only be opened once */
503 if (test_and_set_bit(0, &hpwdt_is_open))
504 return -EBUSY;
505
506 /* Start the watchdog */
507 hpwdt_start();
508 hpwdt_ping();
509
510 return nonseekable_open(inode, file);
511}
512
513static int hpwdt_release(struct inode *inode, struct file *file)
514{
515 /* Stop the watchdog */
516 if (expect_release == 42) {
517 hpwdt_stop();
518 } else {
519 printk(KERN_CRIT
520 "hpwdt: Unexpected close, not stopping watchdog!\n");
521 hpwdt_ping();
522 }
523
524 expect_release = 0;
525
526 /* /dev/watchdog is being closed, make sure it can be re-opened */
527 clear_bit(0, &hpwdt_is_open);
528
529 return 0;
530}
531
532static ssize_t hpwdt_write(struct file *file, const char __user *data,
533 size_t len, loff_t *ppos)
534{
535 /* See if we got the magic character 'V' and reload the timer */
536 if (len) {
537 if (!nowayout) {
538 size_t i;
539
540 /* note: just in case someone wrote the magic character
541 * five months ago... */
542 expect_release = 0;
543
544 /* scan to see whether or not we got the magic char. */
545 for (i = 0; i != len; i++) {
546 char c;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000547 if (get_user(c, data + i))
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000548 return -EFAULT;
549 if (c == 'V')
550 expect_release = 42;
551 }
552 }
553
554 /* someone wrote to us, we should reload the timer */
555 hpwdt_ping();
556 }
557
558 return len;
559}
560
Wim Van Sebroeck42747d72009-12-26 18:55:22 +0000561static const struct watchdog_info ident = {
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000562 .options = WDIOF_SETTIMEOUT |
563 WDIOF_KEEPALIVEPING |
564 WDIOF_MAGICCLOSE,
dann frazier36e3ff42010-07-27 17:50:57 -0600565 .identity = "HP iLO2+ HW Watchdog Timer",
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000566};
567
568static long hpwdt_ioctl(struct file *file, unsigned int cmd,
569 unsigned long arg)
570{
571 void __user *argp = (void __user *)arg;
572 int __user *p = argp;
573 int new_margin;
574 int ret = -ENOTTY;
575
576 switch (cmd) {
577 case WDIOC_GETSUPPORT:
578 ret = 0;
579 if (copy_to_user(argp, &ident, sizeof(ident)))
580 ret = -EFAULT;
581 break;
582
583 case WDIOC_GETSTATUS:
584 case WDIOC_GETBOOTSTATUS:
585 ret = put_user(0, p);
586 break;
587
588 case WDIOC_KEEPALIVE:
589 hpwdt_ping();
590 ret = 0;
591 break;
592
593 case WDIOC_SETTIMEOUT:
594 ret = get_user(new_margin, p);
595 if (ret)
596 break;
597
598 ret = hpwdt_change_timer(new_margin);
599 if (ret)
600 break;
601
602 hpwdt_ping();
603 /* Fall */
604 case WDIOC_GETTIMEOUT:
605 ret = put_user(soft_margin, p);
606 break;
dann frazieraae67f32010-06-02 16:23:41 -0600607
608 case WDIOC_GETTIMELEFT:
609 ret = put_user(hpwdt_time_left(), p);
610 break;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000611 }
612 return ret;
613}
614
615/*
616 * Kernel interfaces
617 */
Wim Van Sebroeckd5c26a52009-03-18 08:18:43 +0000618static const struct file_operations hpwdt_fops = {
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000619 .owner = THIS_MODULE,
620 .llseek = no_llseek,
621 .write = hpwdt_write,
622 .unlocked_ioctl = hpwdt_ioctl,
623 .open = hpwdt_open,
624 .release = hpwdt_release,
625};
626
627static struct miscdevice hpwdt_miscdev = {
628 .minor = WATCHDOG_MINOR,
629 .name = "watchdog",
630 .fops = &hpwdt_fops,
631};
632
dann frazier86ded1f2010-07-27 17:51:02 -0600633#ifdef CONFIG_HPWDT_NMI_DECODING
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000634static struct notifier_block die_notifier = {
635 .notifier_call = hpwdt_pretimeout,
Tom Mingarelli44df7532009-06-18 23:28:57 +0000636 .priority = 0,
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000637};
dann frazier86ded1f2010-07-27 17:51:02 -0600638#endif /* CONFIG_HPWDT_NMI_DECODING */
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000639
640/*
641 * Init & Exit
642 */
643
dann frazier86ded1f2010-07-27 17:51:02 -0600644#ifdef CONFIG_HPWDT_NMI_DECODING
Don Zickus4a7863c2010-12-22 14:00:03 -0500645#ifdef CONFIG_X86_LOCAL_APIC
dann frazier34572b22010-07-27 17:51:01 -0600646static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000647{
648 /*
649 * If nmi_watchdog is turned off then we can turn on
dann frazier34572b22010-07-27 17:51:01 -0600650 * our nmi decoding capability.
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000651 */
Don Zickus072b1982010-11-12 11:22:24 -0500652 hpwdt_nmi_decoding = 1;
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000653}
654#else
dann frazier34572b22010-07-27 17:51:01 -0600655static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000656{
dann frazier34572b22010-07-27 17:51:01 -0600657 dev_warn(&dev->dev, "NMI decoding is disabled. "
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000658 "Your kernel does not support a NMI Watchdog.\n");
659}
Don Zickus4a7863c2010-12-22 14:00:03 -0500660#endif /* CONFIG_X86_LOCAL_APIC */
dann frazier2ec7ed62010-07-28 12:38:43 -0600661
662static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
663{
664 int retval;
665
666 /*
667 * We need to map the ROM to get the CRU service.
668 * For 32 bit Operating Systems we need to go through the 32 Bit
669 * BIOS Service Directory
670 * For 64 bit Operating Systems we get that service through SMBIOS.
671 */
672 retval = detect_cru_service();
673 if (retval < 0) {
674 dev_warn(&dev->dev,
675 "Unable to detect the %d Bit CRU Service.\n",
676 HPWDT_ARCH);
677 return retval;
678 }
679
680 /*
681 * We know this is the only CRU call we need to make so lets keep as
682 * few instructions as possible once the NMI comes in.
683 */
684 cmn_regs.u1.rah = 0x0D;
685 cmn_regs.u1.ral = 0x02;
686
687 /*
688 * If the priority is set to 1, then we will be put first on the
689 * die notify list to handle a critical NMI. The default is to
690 * be last so other users of the NMI signal can function.
691 */
692 if (priority)
693 die_notifier.priority = 0x7FFFFFFF;
694
695 retval = register_die_notifier(&die_notifier);
696 if (retval != 0) {
697 dev_warn(&dev->dev,
698 "Unable to register a die notifier (err=%d).\n",
699 retval);
700 if (cru_rom_addr)
701 iounmap(cru_rom_addr);
702 }
703
704 dev_info(&dev->dev,
705 "HP Watchdog Timer Driver: NMI decoding initialized"
706 ", allow kernel dump: %s (default = 0/OFF)"
707 ", priority: %s (default = 0/LAST).\n",
708 (allow_kdump == 0) ? "OFF" : "ON",
709 (priority == 0) ? "LAST" : "FIRST");
710 return 0;
711}
712
Axel Linb77b7082011-03-02 11:49:44 +0800713static void hpwdt_exit_nmi_decoding(void)
dann frazier2ec7ed62010-07-28 12:38:43 -0600714{
715 unregister_die_notifier(&die_notifier);
716 if (cru_rom_addr)
717 iounmap(cru_rom_addr);
718}
dann frazier86ded1f2010-07-27 17:51:02 -0600719#else /* !CONFIG_HPWDT_NMI_DECODING */
720static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
721{
722}
723
724static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
725{
726 return 0;
727}
728
Axel Linb77b7082011-03-02 11:49:44 +0800729static void hpwdt_exit_nmi_decoding(void)
dann frazier86ded1f2010-07-27 17:51:02 -0600730{
731}
732#endif /* CONFIG_HPWDT_NMI_DECODING */
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000733
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000734static int __devinit hpwdt_init_one(struct pci_dev *dev,
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000735 const struct pci_device_id *ent)
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000736{
737 int retval;
738
739 /*
dann frazier34572b22010-07-27 17:51:01 -0600740 * Check if we can do NMI decoding or not
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000741 */
dann frazier34572b22010-07-27 17:51:01 -0600742 hpwdt_check_nmi_decoding(dev);
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000743
744 /*
dann frazier36e3ff42010-07-27 17:50:57 -0600745 * First let's find out if we are on an iLO2+ server. We will
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000746 * not run on a legacy ASM box.
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000747 * So we only support the G5 ProLiant servers and higher.
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000748 */
749 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
750 dev_warn(&dev->dev,
dann frazier36e3ff42010-07-27 17:50:57 -0600751 "This server does not have an iLO2+ ASIC.\n");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000752 return -ENODEV;
753 }
754
755 if (pci_enable_device(dev)) {
756 dev_warn(&dev->dev,
757 "Not possible to enable PCI Device: 0x%x:0x%x.\n",
758 ent->vendor, ent->device);
759 return -ENODEV;
760 }
761
762 pci_mem_addr = pci_iomap(dev, 1, 0x80);
763 if (!pci_mem_addr) {
764 dev_warn(&dev->dev,
dann frazier36e3ff42010-07-27 17:50:57 -0600765 "Unable to detect the iLO2+ server memory.\n");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000766 retval = -ENOMEM;
767 goto error_pci_iomap;
768 }
769 hpwdt_timer_reg = pci_mem_addr + 0x70;
770 hpwdt_timer_con = pci_mem_addr + 0x72;
771
772 /* Make sure that we have a valid soft_margin */
773 if (hpwdt_change_timer(soft_margin))
774 hpwdt_change_timer(DEFAULT_MARGIN);
775
dann frazier2ec7ed62010-07-28 12:38:43 -0600776 /* Initialize NMI Decoding functionality */
777 retval = hpwdt_init_nmi_decoding(dev);
778 if (retval != 0)
779 goto error_init_nmi_decoding;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000780
781 retval = misc_register(&hpwdt_miscdev);
782 if (retval < 0) {
783 dev_warn(&dev->dev,
784 "Unable to register miscdev on minor=%d (err=%d).\n",
785 WATCHDOG_MINOR, retval);
786 goto error_misc_register;
787 }
788
dann frazier2ec7ed62010-07-28 12:38:43 -0600789 dev_info(&dev->dev, "HP Watchdog Timer Driver: %s"
790 ", timer margin: %d seconds (nowayout=%d).\n",
791 HPWDT_VERSION, soft_margin, nowayout);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000792 return 0;
793
794error_misc_register:
dann frazier2ec7ed62010-07-28 12:38:43 -0600795 hpwdt_exit_nmi_decoding();
796error_init_nmi_decoding:
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000797 pci_iounmap(dev, pci_mem_addr);
798error_pci_iomap:
799 pci_disable_device(dev);
800 return retval;
801}
802
803static void __devexit hpwdt_exit(struct pci_dev *dev)
804{
805 if (!nowayout)
806 hpwdt_stop();
807
808 misc_deregister(&hpwdt_miscdev);
dann frazier2ec7ed62010-07-28 12:38:43 -0600809 hpwdt_exit_nmi_decoding();
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000810 pci_iounmap(dev, pci_mem_addr);
811 pci_disable_device(dev);
812}
813
814static struct pci_driver hpwdt_driver = {
815 .name = "hpwdt",
816 .id_table = hpwdt_devices,
817 .probe = hpwdt_init_one,
818 .remove = __devexit_p(hpwdt_exit),
819};
820
821static void __exit hpwdt_cleanup(void)
822{
823 pci_unregister_driver(&hpwdt_driver);
824}
825
826static int __init hpwdt_init(void)
827{
828 return pci_register_driver(&hpwdt_driver);
829}
830
831MODULE_AUTHOR("Tom Mingarelli");
832MODULE_DESCRIPTION("hp watchdog driver");
833MODULE_LICENSE("GPL");
Thomas Mingarellid8100c32009-03-03 00:17:16 +0000834MODULE_VERSION(HPWDT_VERSION);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000835MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
836
837module_param(soft_margin, int, 0);
838MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
839
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000840module_param(nowayout, int, 0);
841MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
842 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
843
dann frazier86ded1f2010-07-27 17:51:02 -0600844#ifdef CONFIG_HPWDT_NMI_DECODING
dann frazier550d2992010-07-27 17:50:54 -0600845module_param(allow_kdump, int, 0);
846MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
847
Tom Mingarelli44df7532009-06-18 23:28:57 +0000848module_param(priority, int, 0);
849MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last"
850 " (default = 0/Last)\n");
dann frazier86ded1f2010-07-27 17:51:02 -0600851#endif /* !CONFIG_HPWDT_NMI_DECODING */
Tom Mingarelli44df7532009-06-18 23:28:57 +0000852
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000853module_init(hpwdt_init);
854module_exit(hpwdt_cleanup);