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Commit | Line | Data |
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7f4da474 TM |
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> | |
7f4da474 | 19 | #include <linux/io.h> |
a52e6d18 | 20 | #include <linux/bitops.h> |
7f4da474 TM |
21 | #include <linux/kernel.h> |
22 | #include <linux/miscdevice.h> | |
7f4da474 | 23 | #include <linux/module.h> |
7f4da474 | 24 | #include <linux/moduleparam.h> |
7f4da474 TM |
25 | #include <linux/pci.h> |
26 | #include <linux/pci_ids.h> | |
7f4da474 TM |
27 | #include <linux/types.h> |
28 | #include <linux/uaccess.h> | |
29 | #include <linux/watchdog.h> | |
30 | #include <linux/dmi.h> | |
a52e6d18 | 31 | #include <linux/spinlock.h> |
923410d0 | 32 | #include <linux/nmi.h> |
33 | #include <linux/kdebug.h> | |
34 | #include <linux/notifier.h> | |
06026413 | 35 | #include <asm/cacheflush.h> |
7f4da474 | 36 | |
923410d0 | 37 | #define HPWDT_VERSION "1.1.1" |
e802e32d | 38 | #define SECS_TO_TICKS(secs) ((secs) * 1000 / 128) |
6f681c2e | 39 | #define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000) |
40 | #define HPWDT_MAX_TIMER TICKS_TO_SECS(65535) | |
923410d0 | 41 | #define DEFAULT_MARGIN 30 |
42 | ||
43 | static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */ | |
44 | static unsigned int reload; /* the computed soft_margin */ | |
45 | static int nowayout = WATCHDOG_NOWAYOUT; | |
46 | static char expect_release; | |
47 | static unsigned long hpwdt_is_open; | |
48 | ||
49 | static void __iomem *pci_mem_addr; /* the PCI-memory address */ | |
50 | static unsigned long __iomem *hpwdt_timer_reg; | |
51 | static unsigned long __iomem *hpwdt_timer_con; | |
52 | ||
53 | static struct pci_device_id hpwdt_devices[] = { | |
36e3ff44 | 54 | { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */ |
55 | { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */ | |
923410d0 | 56 | {0}, /* terminate list */ |
57 | }; | |
58 | MODULE_DEVICE_TABLE(pci, hpwdt_devices); | |
59 | ||
7f4da474 TM |
60 | #define PCI_BIOS32_SD_VALUE 0x5F32335F /* "_32_" */ |
61 | #define CRU_BIOS_SIGNATURE_VALUE 0x55524324 | |
62 | #define PCI_BIOS32_PARAGRAPH_LEN 16 | |
63 | #define PCI_ROM_BASE1 0x000F0000 | |
64 | #define ROM_SIZE 0x10000 | |
65 | ||
66 | struct bios32_service_dir { | |
67 | u32 signature; | |
68 | u32 entry_point; | |
69 | u8 revision; | |
70 | u8 length; | |
71 | u8 checksum; | |
72 | u8 reserved[5]; | |
73 | }; | |
74 | ||
7f4da474 TM |
75 | /* type 212 */ |
76 | struct smbios_cru64_info { | |
77 | u8 type; | |
78 | u8 byte_length; | |
79 | u16 handle; | |
80 | u32 signature; | |
81 | u64 physical_address; | |
82 | u32 double_length; | |
83 | u32 double_offset; | |
84 | }; | |
85 | #define SMBIOS_CRU64_INFORMATION 212 | |
86 | ||
87 | struct cmn_registers { | |
88 | union { | |
89 | struct { | |
90 | u8 ral; | |
91 | u8 rah; | |
92 | u16 rea2; | |
93 | }; | |
94 | u32 reax; | |
95 | } u1; | |
96 | union { | |
97 | struct { | |
98 | u8 rbl; | |
99 | u8 rbh; | |
100 | u8 reb2l; | |
101 | u8 reb2h; | |
102 | }; | |
103 | u32 rebx; | |
104 | } u2; | |
105 | union { | |
106 | struct { | |
107 | u8 rcl; | |
108 | u8 rch; | |
109 | u16 rec2; | |
110 | }; | |
111 | u32 recx; | |
112 | } u3; | |
113 | union { | |
114 | struct { | |
115 | u8 rdl; | |
116 | u8 rdh; | |
117 | u16 red2; | |
118 | }; | |
119 | u32 redx; | |
120 | } u4; | |
121 | ||
122 | u32 resi; | |
123 | u32 redi; | |
124 | u16 rds; | |
125 | u16 res; | |
126 | u32 reflags; | |
127 | } __attribute__((packed)); | |
128 | ||
34572b29 | 129 | static unsigned int hpwdt_nmi_decoding; |
923410d0 | 130 | static unsigned int allow_kdump; |
44df7535 | 131 | static unsigned int priority; /* hpwdt at end of die_notify list */ |
7f4da474 | 132 | static DEFINE_SPINLOCK(rom_lock); |
7f4da474 | 133 | static void *cru_rom_addr; |
7f4da474 TM |
134 | static struct cmn_registers cmn_regs; |
135 | ||
143a2e54 WVS |
136 | extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, |
137 | unsigned long *pRomEntry); | |
1f6ef234 | 138 | |
6b7f3d53 | 139 | #ifdef CONFIG_X86_32 |
7f4da474 TM |
140 | /* --32 Bit Bios------------------------------------------------------------ */ |
141 | ||
142 | #define HPWDT_ARCH 32 | |
143 | ||
1f6ef234 LT |
144 | asm(".text \n\t" |
145 | ".align 4 \n" | |
146 | "asminline_call: \n\t" | |
147 | "pushl %ebp \n\t" | |
148 | "movl %esp, %ebp \n\t" | |
149 | "pusha \n\t" | |
150 | "pushf \n\t" | |
151 | "push %es \n\t" | |
152 | "push %ds \n\t" | |
153 | "pop %es \n\t" | |
154 | "movl 8(%ebp),%eax \n\t" | |
155 | "movl 4(%eax),%ebx \n\t" | |
156 | "movl 8(%eax),%ecx \n\t" | |
157 | "movl 12(%eax),%edx \n\t" | |
158 | "movl 16(%eax),%esi \n\t" | |
159 | "movl 20(%eax),%edi \n\t" | |
160 | "movl (%eax),%eax \n\t" | |
161 | "push %cs \n\t" | |
162 | "call *12(%ebp) \n\t" | |
163 | "pushf \n\t" | |
164 | "pushl %eax \n\t" | |
165 | "movl 8(%ebp),%eax \n\t" | |
166 | "movl %ebx,4(%eax) \n\t" | |
167 | "movl %ecx,8(%eax) \n\t" | |
168 | "movl %edx,12(%eax) \n\t" | |
169 | "movl %esi,16(%eax) \n\t" | |
170 | "movl %edi,20(%eax) \n\t" | |
171 | "movw %ds,24(%eax) \n\t" | |
172 | "movw %es,26(%eax) \n\t" | |
173 | "popl %ebx \n\t" | |
174 | "movl %ebx,(%eax) \n\t" | |
175 | "popl %ebx \n\t" | |
176 | "movl %ebx,28(%eax) \n\t" | |
177 | "pop %es \n\t" | |
178 | "popf \n\t" | |
179 | "popa \n\t" | |
180 | "leave \n\t" | |
181 | "ret \n\t" | |
182 | ".previous"); | |
183 | ||
7f4da474 TM |
184 | |
185 | /* | |
186 | * cru_detect | |
187 | * | |
188 | * Routine Description: | |
189 | * This function uses the 32-bit BIOS Service Directory record to | |
190 | * search for a $CRU record. | |
191 | * | |
192 | * Return Value: | |
193 | * 0 : SUCCESS | |
194 | * <0 : FAILURE | |
195 | */ | |
196 | static int __devinit cru_detect(unsigned long map_entry, | |
197 | unsigned long map_offset) | |
198 | { | |
199 | void *bios32_map; | |
200 | unsigned long *bios32_entrypoint; | |
201 | unsigned long cru_physical_address; | |
202 | unsigned long cru_length; | |
203 | unsigned long physical_bios_base = 0; | |
204 | unsigned long physical_bios_offset = 0; | |
205 | int retval = -ENODEV; | |
206 | ||
207 | bios32_map = ioremap(map_entry, (2 * PAGE_SIZE)); | |
208 | ||
209 | if (bios32_map == NULL) | |
210 | return -ENODEV; | |
211 | ||
212 | bios32_entrypoint = bios32_map + map_offset; | |
213 | ||
214 | cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE; | |
215 | ||
216 | asminline_call(&cmn_regs, bios32_entrypoint); | |
217 | ||
218 | if (cmn_regs.u1.ral != 0) { | |
219 | printk(KERN_WARNING | |
ab4ba3cd TM |
220 | "hpwdt: Call succeeded but with an error: 0x%x\n", |
221 | cmn_regs.u1.ral); | |
7f4da474 TM |
222 | } else { |
223 | physical_bios_base = cmn_regs.u2.rebx; | |
224 | physical_bios_offset = cmn_regs.u4.redx; | |
225 | cru_length = cmn_regs.u3.recx; | |
226 | cru_physical_address = | |
ab4ba3cd | 227 | physical_bios_base + physical_bios_offset; |
7f4da474 TM |
228 | |
229 | /* If the values look OK, then map it in. */ | |
230 | if ((physical_bios_base + physical_bios_offset)) { | |
231 | cru_rom_addr = | |
ab4ba3cd | 232 | ioremap(cru_physical_address, cru_length); |
7f4da474 TM |
233 | if (cru_rom_addr) |
234 | retval = 0; | |
235 | } | |
236 | ||
237 | printk(KERN_DEBUG "hpwdt: CRU Base Address: 0x%lx\n", | |
238 | physical_bios_base); | |
239 | printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n", | |
240 | physical_bios_offset); | |
241 | printk(KERN_DEBUG "hpwdt: CRU Length: 0x%lx\n", | |
242 | cru_length); | |
adb23631 KV |
243 | printk(KERN_DEBUG "hpwdt: CRU Mapped Address: %p\n", |
244 | &cru_rom_addr); | |
7f4da474 TM |
245 | } |
246 | iounmap(bios32_map); | |
247 | return retval; | |
248 | } | |
249 | ||
30ec910e RD |
250 | /* |
251 | * bios_checksum | |
252 | */ | |
253 | static int __devinit bios_checksum(const char __iomem *ptr, int len) | |
254 | { | |
255 | char sum = 0; | |
256 | int i; | |
257 | ||
258 | /* | |
259 | * calculate checksum of size bytes. This should add up | |
260 | * to zero if we have a valid header. | |
261 | */ | |
262 | for (i = 0; i < len; i++) | |
263 | sum += ptr[i]; | |
264 | ||
265 | return ((sum == 0) && (len > 0)); | |
266 | } | |
267 | ||
7f4da474 TM |
268 | /* |
269 | * bios32_present | |
270 | * | |
271 | * Routine Description: | |
272 | * This function finds the 32-bit BIOS Service Directory | |
273 | * | |
274 | * Return Value: | |
275 | * 0 : SUCCESS | |
276 | * <0 : FAILURE | |
277 | */ | |
278 | static int __devinit bios32_present(const char __iomem *p) | |
279 | { | |
280 | struct bios32_service_dir *bios_32_ptr; | |
281 | int length; | |
282 | unsigned long map_entry, map_offset; | |
283 | ||
284 | bios_32_ptr = (struct bios32_service_dir *) p; | |
285 | ||
286 | /* | |
287 | * Search for signature by checking equal to the swizzled value | |
288 | * instead of calling another routine to perform a strcmp. | |
289 | */ | |
290 | if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) { | |
291 | length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN; | |
292 | if (bios_checksum(p, length)) { | |
293 | /* | |
294 | * According to the spec, we're looking for the | |
295 | * first 4KB-aligned address below the entrypoint | |
296 | * listed in the header. The Service Directory code | |
297 | * is guaranteed to occupy no more than 2 4KB pages. | |
298 | */ | |
299 | map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1); | |
300 | map_offset = bios_32_ptr->entry_point - map_entry; | |
301 | ||
302 | return cru_detect(map_entry, map_offset); | |
303 | } | |
304 | } | |
305 | return -ENODEV; | |
306 | } | |
307 | ||
308 | static int __devinit detect_cru_service(void) | |
309 | { | |
310 | char __iomem *p, *q; | |
311 | int rc = -1; | |
312 | ||
313 | /* | |
314 | * Search from 0x0f0000 through 0x0fffff, inclusive. | |
315 | */ | |
316 | p = ioremap(PCI_ROM_BASE1, ROM_SIZE); | |
317 | if (p == NULL) | |
318 | return -ENOMEM; | |
319 | ||
320 | for (q = p; q < p + ROM_SIZE; q += 16) { | |
321 | rc = bios32_present(q); | |
322 | if (!rc) | |
323 | break; | |
324 | } | |
325 | iounmap(p); | |
326 | return rc; | |
327 | } | |
6b7f3d53 | 328 | /* ------------------------------------------------------------------------- */ |
329 | #endif /* CONFIG_X86_32 */ | |
330 | #ifdef CONFIG_X86_64 | |
7f4da474 TM |
331 | /* --64 Bit Bios------------------------------------------------------------ */ |
332 | ||
333 | #define HPWDT_ARCH 64 | |
334 | ||
1f6ef234 LT |
335 | asm(".text \n\t" |
336 | ".align 4 \n" | |
337 | "asminline_call: \n\t" | |
338 | "pushq %rbp \n\t" | |
339 | "movq %rsp, %rbp \n\t" | |
340 | "pushq %rax \n\t" | |
341 | "pushq %rbx \n\t" | |
342 | "pushq %rdx \n\t" | |
343 | "pushq %r12 \n\t" | |
344 | "pushq %r9 \n\t" | |
345 | "movq %rsi, %r12 \n\t" | |
346 | "movq %rdi, %r9 \n\t" | |
347 | "movl 4(%r9),%ebx \n\t" | |
348 | "movl 8(%r9),%ecx \n\t" | |
349 | "movl 12(%r9),%edx \n\t" | |
350 | "movl 16(%r9),%esi \n\t" | |
351 | "movl 20(%r9),%edi \n\t" | |
352 | "movl (%r9),%eax \n\t" | |
353 | "call *%r12 \n\t" | |
354 | "pushfq \n\t" | |
355 | "popq %r12 \n\t" | |
1f6ef234 LT |
356 | "movl %eax, (%r9) \n\t" |
357 | "movl %ebx, 4(%r9) \n\t" | |
358 | "movl %ecx, 8(%r9) \n\t" | |
359 | "movl %edx, 12(%r9) \n\t" | |
360 | "movl %esi, 16(%r9) \n\t" | |
361 | "movl %edi, 20(%r9) \n\t" | |
362 | "movq %r12, %rax \n\t" | |
363 | "movl %eax, 28(%r9) \n\t" | |
364 | "popq %r9 \n\t" | |
365 | "popq %r12 \n\t" | |
366 | "popq %rdx \n\t" | |
367 | "popq %rbx \n\t" | |
368 | "popq %rax \n\t" | |
369 | "leave \n\t" | |
370 | "ret \n\t" | |
371 | ".previous"); | |
7f4da474 TM |
372 | |
373 | /* | |
374 | * dmi_find_cru | |
375 | * | |
376 | * Routine Description: | |
30ec910e | 377 | * This function checks whether or not a SMBIOS/DMI record is |
7f4da474 | 378 | * the 64bit CRU info or not |
7f4da474 | 379 | */ |
e7a19c56 | 380 | static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy) |
7f4da474 TM |
381 | { |
382 | struct smbios_cru64_info *smbios_cru64_ptr; | |
383 | unsigned long cru_physical_address; | |
384 | ||
385 | if (dm->type == SMBIOS_CRU64_INFORMATION) { | |
386 | smbios_cru64_ptr = (struct smbios_cru64_info *) dm; | |
387 | if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) { | |
388 | cru_physical_address = | |
ab4ba3cd TM |
389 | smbios_cru64_ptr->physical_address + |
390 | smbios_cru64_ptr->double_offset; | |
7f4da474 | 391 | cru_rom_addr = ioremap(cru_physical_address, |
ab4ba3cd | 392 | smbios_cru64_ptr->double_length); |
06026413 BW |
393 | set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK, |
394 | smbios_cru64_ptr->double_length >> PAGE_SHIFT); | |
7f4da474 TM |
395 | } |
396 | } | |
397 | } | |
398 | ||
7f4da474 TM |
399 | static int __devinit detect_cru_service(void) |
400 | { | |
401 | cru_rom_addr = NULL; | |
402 | ||
e7a19c56 | 403 | dmi_walk(dmi_find_cru, NULL); |
7f4da474 TM |
404 | |
405 | /* if cru_rom_addr has been set then we found a CRU service */ | |
ab4ba3cd | 406 | return ((cru_rom_addr != NULL) ? 0 : -ENODEV); |
7f4da474 | 407 | } |
7f4da474 | 408 | /* ------------------------------------------------------------------------- */ |
6b7f3d53 | 409 | #endif /* CONFIG_X86_64 */ |
7f4da474 | 410 | |
7f4da474 TM |
411 | /* |
412 | * Watchdog operations | |
413 | */ | |
414 | static void hpwdt_start(void) | |
415 | { | |
e802e32d | 416 | reload = SECS_TO_TICKS(soft_margin); |
7f4da474 TM |
417 | iowrite16(reload, hpwdt_timer_reg); |
418 | iowrite16(0x85, hpwdt_timer_con); | |
419 | } | |
420 | ||
421 | static void hpwdt_stop(void) | |
422 | { | |
423 | unsigned long data; | |
424 | ||
425 | data = ioread16(hpwdt_timer_con); | |
426 | data &= 0xFE; | |
427 | iowrite16(data, hpwdt_timer_con); | |
428 | } | |
429 | ||
430 | static void hpwdt_ping(void) | |
431 | { | |
432 | iowrite16(reload, hpwdt_timer_reg); | |
433 | } | |
434 | ||
435 | static int hpwdt_change_timer(int new_margin) | |
436 | { | |
6f681c2e | 437 | if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) { |
7f4da474 TM |
438 | printk(KERN_WARNING |
439 | "hpwdt: New value passed in is invalid: %d seconds.\n", | |
440 | new_margin); | |
441 | return -EINVAL; | |
442 | } | |
443 | ||
444 | soft_margin = new_margin; | |
445 | printk(KERN_DEBUG | |
446 | "hpwdt: New timer passed in is %d seconds.\n", | |
447 | new_margin); | |
e802e32d | 448 | reload = SECS_TO_TICKS(soft_margin); |
7f4da474 TM |
449 | |
450 | return 0; | |
451 | } | |
452 | ||
aae67f36 | 453 | static int hpwdt_time_left(void) |
454 | { | |
455 | return TICKS_TO_SECS(ioread16(hpwdt_timer_reg)); | |
456 | } | |
457 | ||
ab4ba3cd TM |
458 | /* |
459 | * NMI Handler | |
460 | */ | |
461 | static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason, | |
462 | void *data) | |
463 | { | |
464 | unsigned long rom_pl; | |
465 | static int die_nmi_called; | |
466 | ||
467 | if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI) | |
243066ba | 468 | goto out; |
469 | ||
34572b29 | 470 | if (!hpwdt_nmi_decoding) |
243066ba | 471 | goto out; |
472 | ||
473 | spin_lock_irqsave(&rom_lock, rom_pl); | |
474 | if (!die_nmi_called) | |
475 | asminline_call(&cmn_regs, cru_rom_addr); | |
476 | die_nmi_called = 1; | |
477 | spin_unlock_irqrestore(&rom_lock, rom_pl); | |
478 | if (cmn_regs.u1.ral == 0) { | |
479 | printk(KERN_WARNING "hpwdt: An NMI occurred, " | |
480 | "but unable to determine source.\n"); | |
481 | } else { | |
482 | if (allow_kdump) | |
483 | hpwdt_stop(); | |
484 | panic("An NMI occurred, please see the Integrated " | |
485 | "Management Log for details.\n"); | |
ab4ba3cd | 486 | } |
243066ba | 487 | out: |
290172e7 | 488 | return NOTIFY_OK; |
ab4ba3cd TM |
489 | } |
490 | ||
7f4da474 TM |
491 | /* |
492 | * /dev/watchdog handling | |
493 | */ | |
494 | static int hpwdt_open(struct inode *inode, struct file *file) | |
495 | { | |
496 | /* /dev/watchdog can only be opened once */ | |
497 | if (test_and_set_bit(0, &hpwdt_is_open)) | |
498 | return -EBUSY; | |
499 | ||
500 | /* Start the watchdog */ | |
501 | hpwdt_start(); | |
502 | hpwdt_ping(); | |
503 | ||
504 | return nonseekable_open(inode, file); | |
505 | } | |
506 | ||
507 | static int hpwdt_release(struct inode *inode, struct file *file) | |
508 | { | |
509 | /* Stop the watchdog */ | |
510 | if (expect_release == 42) { | |
511 | hpwdt_stop(); | |
512 | } else { | |
513 | printk(KERN_CRIT | |
514 | "hpwdt: Unexpected close, not stopping watchdog!\n"); | |
515 | hpwdt_ping(); | |
516 | } | |
517 | ||
518 | expect_release = 0; | |
519 | ||
520 | /* /dev/watchdog is being closed, make sure it can be re-opened */ | |
521 | clear_bit(0, &hpwdt_is_open); | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | static ssize_t hpwdt_write(struct file *file, const char __user *data, | |
527 | size_t len, loff_t *ppos) | |
528 | { | |
529 | /* See if we got the magic character 'V' and reload the timer */ | |
530 | if (len) { | |
531 | if (!nowayout) { | |
532 | size_t i; | |
533 | ||
534 | /* note: just in case someone wrote the magic character | |
535 | * five months ago... */ | |
536 | expect_release = 0; | |
537 | ||
538 | /* scan to see whether or not we got the magic char. */ | |
539 | for (i = 0; i != len; i++) { | |
540 | char c; | |
7944d3a5 | 541 | if (get_user(c, data + i)) |
7f4da474 TM |
542 | return -EFAULT; |
543 | if (c == 'V') | |
544 | expect_release = 42; | |
545 | } | |
546 | } | |
547 | ||
548 | /* someone wrote to us, we should reload the timer */ | |
549 | hpwdt_ping(); | |
550 | } | |
551 | ||
552 | return len; | |
553 | } | |
554 | ||
42747d71 | 555 | static const struct watchdog_info ident = { |
7f4da474 TM |
556 | .options = WDIOF_SETTIMEOUT | |
557 | WDIOF_KEEPALIVEPING | | |
558 | WDIOF_MAGICCLOSE, | |
36e3ff44 | 559 | .identity = "HP iLO2+ HW Watchdog Timer", |
7f4da474 TM |
560 | }; |
561 | ||
562 | static long hpwdt_ioctl(struct file *file, unsigned int cmd, | |
563 | unsigned long arg) | |
564 | { | |
565 | void __user *argp = (void __user *)arg; | |
566 | int __user *p = argp; | |
567 | int new_margin; | |
568 | int ret = -ENOTTY; | |
569 | ||
570 | switch (cmd) { | |
571 | case WDIOC_GETSUPPORT: | |
572 | ret = 0; | |
573 | if (copy_to_user(argp, &ident, sizeof(ident))) | |
574 | ret = -EFAULT; | |
575 | break; | |
576 | ||
577 | case WDIOC_GETSTATUS: | |
578 | case WDIOC_GETBOOTSTATUS: | |
579 | ret = put_user(0, p); | |
580 | break; | |
581 | ||
582 | case WDIOC_KEEPALIVE: | |
583 | hpwdt_ping(); | |
584 | ret = 0; | |
585 | break; | |
586 | ||
587 | case WDIOC_SETTIMEOUT: | |
588 | ret = get_user(new_margin, p); | |
589 | if (ret) | |
590 | break; | |
591 | ||
592 | ret = hpwdt_change_timer(new_margin); | |
593 | if (ret) | |
594 | break; | |
595 | ||
596 | hpwdt_ping(); | |
597 | /* Fall */ | |
598 | case WDIOC_GETTIMEOUT: | |
599 | ret = put_user(soft_margin, p); | |
600 | break; | |
aae67f36 | 601 | |
602 | case WDIOC_GETTIMELEFT: | |
603 | ret = put_user(hpwdt_time_left(), p); | |
604 | break; | |
7f4da474 TM |
605 | } |
606 | return ret; | |
607 | } | |
608 | ||
609 | /* | |
610 | * Kernel interfaces | |
611 | */ | |
d5c26a59 | 612 | static const struct file_operations hpwdt_fops = { |
7f4da474 TM |
613 | .owner = THIS_MODULE, |
614 | .llseek = no_llseek, | |
615 | .write = hpwdt_write, | |
616 | .unlocked_ioctl = hpwdt_ioctl, | |
617 | .open = hpwdt_open, | |
618 | .release = hpwdt_release, | |
619 | }; | |
620 | ||
621 | static struct miscdevice hpwdt_miscdev = { | |
622 | .minor = WATCHDOG_MINOR, | |
623 | .name = "watchdog", | |
624 | .fops = &hpwdt_fops, | |
625 | }; | |
626 | ||
627 | static struct notifier_block die_notifier = { | |
628 | .notifier_call = hpwdt_pretimeout, | |
44df7535 | 629 | .priority = 0, |
7f4da474 TM |
630 | }; |
631 | ||
632 | /* | |
633 | * Init & Exit | |
634 | */ | |
635 | ||
47bece87 | 636 | #ifdef ARCH_HAS_NMI_WATCHDOG |
34572b29 | 637 | static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev) |
47bece87 TM |
638 | { |
639 | /* | |
640 | * If nmi_watchdog is turned off then we can turn on | |
34572b29 | 641 | * our nmi decoding capability. |
47bece87 TM |
642 | */ |
643 | if (!nmi_watchdog_active()) | |
34572b29 | 644 | hpwdt_nmi_decoding = 1; |
47bece87 | 645 | else |
34572b29 | 646 | dev_warn(&dev->dev, "NMI decoding is disabled. To enable this " |
44df7535 TM |
647 | "functionality you must reboot with nmi_watchdog=0 " |
648 | "and load the hpwdt driver with priority=1.\n"); | |
47bece87 TM |
649 | } |
650 | #else | |
34572b29 | 651 | static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev) |
47bece87 | 652 | { |
34572b29 | 653 | dev_warn(&dev->dev, "NMI decoding is disabled. " |
47bece87 TM |
654 | "Your kernel does not support a NMI Watchdog.\n"); |
655 | } | |
656 | #endif | |
657 | ||
7f4da474 | 658 | static int __devinit hpwdt_init_one(struct pci_dev *dev, |
ab4ba3cd | 659 | const struct pci_device_id *ent) |
7f4da474 TM |
660 | { |
661 | int retval; | |
662 | ||
47bece87 | 663 | /* |
34572b29 | 664 | * Check if we can do NMI decoding or not |
47bece87 | 665 | */ |
34572b29 | 666 | hpwdt_check_nmi_decoding(dev); |
47bece87 | 667 | |
7f4da474 | 668 | /* |
36e3ff44 | 669 | * First let's find out if we are on an iLO2+ server. We will |
7f4da474 | 670 | * not run on a legacy ASM box. |
ab4ba3cd | 671 | * So we only support the G5 ProLiant servers and higher. |
7f4da474 TM |
672 | */ |
673 | if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) { | |
674 | dev_warn(&dev->dev, | |
36e3ff44 | 675 | "This server does not have an iLO2+ ASIC.\n"); |
7f4da474 TM |
676 | return -ENODEV; |
677 | } | |
678 | ||
679 | if (pci_enable_device(dev)) { | |
680 | dev_warn(&dev->dev, | |
681 | "Not possible to enable PCI Device: 0x%x:0x%x.\n", | |
682 | ent->vendor, ent->device); | |
683 | return -ENODEV; | |
684 | } | |
685 | ||
686 | pci_mem_addr = pci_iomap(dev, 1, 0x80); | |
687 | if (!pci_mem_addr) { | |
688 | dev_warn(&dev->dev, | |
36e3ff44 | 689 | "Unable to detect the iLO2+ server memory.\n"); |
7f4da474 TM |
690 | retval = -ENOMEM; |
691 | goto error_pci_iomap; | |
692 | } | |
693 | hpwdt_timer_reg = pci_mem_addr + 0x70; | |
694 | hpwdt_timer_con = pci_mem_addr + 0x72; | |
695 | ||
696 | /* Make sure that we have a valid soft_margin */ | |
697 | if (hpwdt_change_timer(soft_margin)) | |
698 | hpwdt_change_timer(DEFAULT_MARGIN); | |
699 | ||
700 | /* | |
701 | * We need to map the ROM to get the CRU service. | |
702 | * For 32 bit Operating Systems we need to go through the 32 Bit | |
703 | * BIOS Service Directory | |
704 | * For 64 bit Operating Systems we get that service through SMBIOS. | |
705 | */ | |
706 | retval = detect_cru_service(); | |
707 | if (retval < 0) { | |
708 | dev_warn(&dev->dev, | |
ab4ba3cd | 709 | "Unable to detect the %d Bit CRU Service.\n", |
7f4da474 TM |
710 | HPWDT_ARCH); |
711 | goto error_get_cru; | |
712 | } | |
713 | ||
714 | /* | |
715 | * We know this is the only CRU call we need to make so lets keep as | |
716 | * few instructions as possible once the NMI comes in. | |
717 | */ | |
718 | cmn_regs.u1.rah = 0x0D; | |
719 | cmn_regs.u1.ral = 0x02; | |
720 | ||
44df7535 TM |
721 | /* |
722 | * If the priority is set to 1, then we will be put first on the | |
723 | * die notify list to handle a critical NMI. The default is to | |
724 | * be last so other users of the NMI signal can function. | |
725 | */ | |
726 | if (priority) | |
727 | die_notifier.priority = 0x7FFFFFFF; | |
728 | ||
7f4da474 TM |
729 | retval = register_die_notifier(&die_notifier); |
730 | if (retval != 0) { | |
731 | dev_warn(&dev->dev, | |
ab4ba3cd | 732 | "Unable to register a die notifier (err=%d).\n", |
7f4da474 TM |
733 | retval); |
734 | goto error_die_notifier; | |
735 | } | |
736 | ||
737 | retval = misc_register(&hpwdt_miscdev); | |
738 | if (retval < 0) { | |
739 | dev_warn(&dev->dev, | |
740 | "Unable to register miscdev on minor=%d (err=%d).\n", | |
741 | WATCHDOG_MINOR, retval); | |
742 | goto error_misc_register; | |
743 | } | |
744 | ||
745 | printk(KERN_INFO | |
d8100c3a | 746 | "hp Watchdog Timer Driver: %s" |
ab4ba3cd | 747 | ", timer margin: %d seconds (nowayout=%d)" |
44df7535 TM |
748 | ", allow kernel dump: %s (default = 0/OFF)" |
749 | ", priority: %s (default = 0/LAST).\n", | |
d8100c3a | 750 | HPWDT_VERSION, soft_margin, nowayout, |
44df7535 TM |
751 | (allow_kdump == 0) ? "OFF" : "ON", |
752 | (priority == 0) ? "LAST" : "FIRST"); | |
7f4da474 TM |
753 | |
754 | return 0; | |
755 | ||
756 | error_misc_register: | |
757 | unregister_die_notifier(&die_notifier); | |
758 | error_die_notifier: | |
759 | if (cru_rom_addr) | |
760 | iounmap(cru_rom_addr); | |
761 | error_get_cru: | |
762 | pci_iounmap(dev, pci_mem_addr); | |
763 | error_pci_iomap: | |
764 | pci_disable_device(dev); | |
765 | return retval; | |
766 | } | |
767 | ||
768 | static void __devexit hpwdt_exit(struct pci_dev *dev) | |
769 | { | |
770 | if (!nowayout) | |
771 | hpwdt_stop(); | |
772 | ||
773 | misc_deregister(&hpwdt_miscdev); | |
774 | unregister_die_notifier(&die_notifier); | |
775 | ||
776 | if (cru_rom_addr) | |
777 | iounmap(cru_rom_addr); | |
778 | pci_iounmap(dev, pci_mem_addr); | |
779 | pci_disable_device(dev); | |
780 | } | |
781 | ||
782 | static struct pci_driver hpwdt_driver = { | |
783 | .name = "hpwdt", | |
784 | .id_table = hpwdt_devices, | |
785 | .probe = hpwdt_init_one, | |
786 | .remove = __devexit_p(hpwdt_exit), | |
787 | }; | |
788 | ||
789 | static void __exit hpwdt_cleanup(void) | |
790 | { | |
791 | pci_unregister_driver(&hpwdt_driver); | |
792 | } | |
793 | ||
794 | static int __init hpwdt_init(void) | |
795 | { | |
796 | return pci_register_driver(&hpwdt_driver); | |
797 | } | |
798 | ||
799 | MODULE_AUTHOR("Tom Mingarelli"); | |
800 | MODULE_DESCRIPTION("hp watchdog driver"); | |
801 | MODULE_LICENSE("GPL"); | |
d8100c3a | 802 | MODULE_VERSION(HPWDT_VERSION); |
7f4da474 TM |
803 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
804 | ||
805 | module_param(soft_margin, int, 0); | |
806 | MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds"); | |
807 | ||
808 | module_param(nowayout, int, 0); | |
809 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" | |
810 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
811 | ||
550d299e | 812 | module_param(allow_kdump, int, 0); |
813 | MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs"); | |
814 | ||
44df7535 TM |
815 | module_param(priority, int, 0); |
816 | MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last" | |
817 | " (default = 0/Last)\n"); | |
818 | ||
7f4da474 TM |
819 | module_init(hpwdt_init); |
820 | module_exit(hpwdt_cleanup); |