Commit | Line | Data |
---|---|---|
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 | ||
27c766aa JP |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | ||
7f4da474 TM |
18 | #include <linux/device.h> |
19 | #include <linux/fs.h> | |
20 | #include <linux/init.h> | |
7f4da474 | 21 | #include <linux/io.h> |
a52e6d18 | 22 | #include <linux/bitops.h> |
7f4da474 TM |
23 | #include <linux/kernel.h> |
24 | #include <linux/miscdevice.h> | |
7f4da474 | 25 | #include <linux/module.h> |
7f4da474 | 26 | #include <linux/moduleparam.h> |
7f4da474 TM |
27 | #include <linux/pci.h> |
28 | #include <linux/pci_ids.h> | |
7f4da474 TM |
29 | #include <linux/types.h> |
30 | #include <linux/uaccess.h> | |
31 | #include <linux/watchdog.h> | |
86ded1f3 | 32 | #ifdef CONFIG_HPWDT_NMI_DECODING |
7f4da474 | 33 | #include <linux/dmi.h> |
a52e6d18 | 34 | #include <linux/spinlock.h> |
923410d0 | 35 | #include <linux/nmi.h> |
36 | #include <linux/kdebug.h> | |
37 | #include <linux/notifier.h> | |
06026413 | 38 | #include <asm/cacheflush.h> |
86ded1f3 | 39 | #endif /* CONFIG_HPWDT_NMI_DECODING */ |
d48b0e17 | 40 | #include <asm/nmi.h> |
7f4da474 | 41 | |
e16cfb9d | 42 | #define HPWDT_VERSION "1.3.1" |
e802e32d | 43 | #define SECS_TO_TICKS(secs) ((secs) * 1000 / 128) |
6f681c2e | 44 | #define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000) |
45 | #define HPWDT_MAX_TIMER TICKS_TO_SECS(65535) | |
923410d0 | 46 | #define DEFAULT_MARGIN 30 |
47 | ||
48 | static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */ | |
49 | static unsigned int reload; /* the computed soft_margin */ | |
86a1e189 | 50 | static bool nowayout = WATCHDOG_NOWAYOUT; |
923410d0 | 51 | static char expect_release; |
52 | static unsigned long hpwdt_is_open; | |
53 | ||
54 | static void __iomem *pci_mem_addr; /* the PCI-memory address */ | |
55 | static unsigned long __iomem *hpwdt_timer_reg; | |
56 | static unsigned long __iomem *hpwdt_timer_con; | |
57 | ||
4562f539 | 58 | static DEFINE_PCI_DEVICE_TABLE(hpwdt_devices) = { |
36e3ff44 | 59 | { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */ |
60 | { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */ | |
923410d0 | 61 | {0}, /* terminate list */ |
62 | }; | |
63 | MODULE_DEVICE_TABLE(pci, hpwdt_devices); | |
64 | ||
86ded1f3 | 65 | #ifdef CONFIG_HPWDT_NMI_DECODING |
7f4da474 TM |
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 | ||
72 | struct 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 | ||
7f4da474 TM |
81 | /* type 212 */ |
82 | struct 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 | ||
5efc7a62 TM |
93 | /* type 219 */ |
94 | struct 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 | ||
7f4da474 TM |
106 | struct 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 | ||
34572b29 | 148 | static unsigned int hpwdt_nmi_decoding; |
a089361c | 149 | static unsigned int allow_kdump = 1; |
5efc7a62 | 150 | static unsigned int is_icru; |
7f4da474 | 151 | static DEFINE_SPINLOCK(rom_lock); |
7f4da474 | 152 | static void *cru_rom_addr; |
7f4da474 TM |
153 | static struct cmn_registers cmn_regs; |
154 | ||
143a2e54 WVS |
155 | extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, |
156 | unsigned long *pRomEntry); | |
1f6ef234 | 157 | |
6b7f3d53 | 158 | #ifdef CONFIG_X86_32 |
7f4da474 TM |
159 | /* --32 Bit Bios------------------------------------------------------------ */ |
160 | ||
161 | #define HPWDT_ARCH 32 | |
162 | ||
1f6ef234 LT |
163 | asm(".text \n\t" |
164 | ".align 4 \n" | |
165 | "asminline_call: \n\t" | |
166 | "pushl %ebp \n\t" | |
167 | "movl %esp, %ebp \n\t" | |
168 | "pusha \n\t" | |
169 | "pushf \n\t" | |
170 | "push %es \n\t" | |
171 | "push %ds \n\t" | |
172 | "pop %es \n\t" | |
173 | "movl 8(%ebp),%eax \n\t" | |
174 | "movl 4(%eax),%ebx \n\t" | |
175 | "movl 8(%eax),%ecx \n\t" | |
176 | "movl 12(%eax),%edx \n\t" | |
177 | "movl 16(%eax),%esi \n\t" | |
178 | "movl 20(%eax),%edi \n\t" | |
179 | "movl (%eax),%eax \n\t" | |
180 | "push %cs \n\t" | |
181 | "call *12(%ebp) \n\t" | |
182 | "pushf \n\t" | |
183 | "pushl %eax \n\t" | |
184 | "movl 8(%ebp),%eax \n\t" | |
185 | "movl %ebx,4(%eax) \n\t" | |
186 | "movl %ecx,8(%eax) \n\t" | |
187 | "movl %edx,12(%eax) \n\t" | |
188 | "movl %esi,16(%eax) \n\t" | |
189 | "movl %edi,20(%eax) \n\t" | |
190 | "movw %ds,24(%eax) \n\t" | |
191 | "movw %es,26(%eax) \n\t" | |
192 | "popl %ebx \n\t" | |
193 | "movl %ebx,(%eax) \n\t" | |
194 | "popl %ebx \n\t" | |
195 | "movl %ebx,28(%eax) \n\t" | |
196 | "pop %es \n\t" | |
197 | "popf \n\t" | |
198 | "popa \n\t" | |
199 | "leave \n\t" | |
200 | "ret \n\t" | |
201 | ".previous"); | |
202 | ||
7f4da474 TM |
203 | |
204 | /* | |
205 | * cru_detect | |
206 | * | |
207 | * Routine Description: | |
208 | * This function uses the 32-bit BIOS Service Directory record to | |
209 | * search for a $CRU record. | |
210 | * | |
211 | * Return Value: | |
212 | * 0 : SUCCESS | |
213 | * <0 : FAILURE | |
214 | */ | |
2d991a16 | 215 | static int cru_detect(unsigned long map_entry, |
7f4da474 TM |
216 | unsigned long map_offset) |
217 | { | |
218 | void *bios32_map; | |
219 | unsigned long *bios32_entrypoint; | |
220 | unsigned long cru_physical_address; | |
221 | unsigned long cru_length; | |
222 | unsigned long physical_bios_base = 0; | |
223 | unsigned long physical_bios_offset = 0; | |
224 | int retval = -ENODEV; | |
225 | ||
226 | bios32_map = ioremap(map_entry, (2 * PAGE_SIZE)); | |
227 | ||
228 | if (bios32_map == NULL) | |
229 | return -ENODEV; | |
230 | ||
231 | bios32_entrypoint = bios32_map + map_offset; | |
232 | ||
233 | cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE; | |
234 | ||
97d2a10d | 235 | set_memory_x((unsigned long)bios32_map, 2); |
7f4da474 TM |
236 | asminline_call(&cmn_regs, bios32_entrypoint); |
237 | ||
238 | if (cmn_regs.u1.ral != 0) { | |
27c766aa | 239 | pr_warn("Call succeeded but with an error: 0x%x\n", |
ab4ba3cd | 240 | cmn_regs.u1.ral); |
7f4da474 TM |
241 | } else { |
242 | physical_bios_base = cmn_regs.u2.rebx; | |
243 | physical_bios_offset = cmn_regs.u4.redx; | |
244 | cru_length = cmn_regs.u3.recx; | |
245 | cru_physical_address = | |
ab4ba3cd | 246 | physical_bios_base + physical_bios_offset; |
7f4da474 TM |
247 | |
248 | /* If the values look OK, then map it in. */ | |
249 | if ((physical_bios_base + physical_bios_offset)) { | |
250 | cru_rom_addr = | |
ab4ba3cd | 251 | ioremap(cru_physical_address, cru_length); |
e67d668e | 252 | if (cru_rom_addr) { |
97d2a10d MU |
253 | set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK, |
254 | (cru_length + PAGE_SIZE - 1) >> PAGE_SHIFT); | |
7f4da474 | 255 | retval = 0; |
e67d668e | 256 | } |
7f4da474 TM |
257 | } |
258 | ||
27c766aa JP |
259 | pr_debug("CRU Base Address: 0x%lx\n", physical_bios_base); |
260 | pr_debug("CRU Offset Address: 0x%lx\n", physical_bios_offset); | |
261 | pr_debug("CRU Length: 0x%lx\n", cru_length); | |
262 | pr_debug("CRU Mapped Address: %p\n", &cru_rom_addr); | |
7f4da474 TM |
263 | } |
264 | iounmap(bios32_map); | |
265 | return retval; | |
266 | } | |
267 | ||
30ec910e RD |
268 | /* |
269 | * bios_checksum | |
270 | */ | |
2d991a16 | 271 | static int bios_checksum(const char __iomem *ptr, int len) |
30ec910e RD |
272 | { |
273 | char sum = 0; | |
274 | int i; | |
275 | ||
276 | /* | |
277 | * calculate checksum of size bytes. This should add up | |
278 | * to zero if we have a valid header. | |
279 | */ | |
280 | for (i = 0; i < len; i++) | |
281 | sum += ptr[i]; | |
282 | ||
283 | return ((sum == 0) && (len > 0)); | |
284 | } | |
285 | ||
7f4da474 TM |
286 | /* |
287 | * bios32_present | |
288 | * | |
289 | * Routine Description: | |
290 | * This function finds the 32-bit BIOS Service Directory | |
291 | * | |
292 | * Return Value: | |
293 | * 0 : SUCCESS | |
294 | * <0 : FAILURE | |
295 | */ | |
2d991a16 | 296 | static int bios32_present(const char __iomem *p) |
7f4da474 TM |
297 | { |
298 | struct bios32_service_dir *bios_32_ptr; | |
299 | int length; | |
300 | unsigned long map_entry, map_offset; | |
301 | ||
302 | bios_32_ptr = (struct bios32_service_dir *) p; | |
303 | ||
304 | /* | |
305 | * Search for signature by checking equal to the swizzled value | |
306 | * instead of calling another routine to perform a strcmp. | |
307 | */ | |
308 | if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) { | |
309 | length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN; | |
310 | if (bios_checksum(p, length)) { | |
311 | /* | |
312 | * According to the spec, we're looking for the | |
313 | * first 4KB-aligned address below the entrypoint | |
314 | * listed in the header. The Service Directory code | |
315 | * is guaranteed to occupy no more than 2 4KB pages. | |
316 | */ | |
317 | map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1); | |
318 | map_offset = bios_32_ptr->entry_point - map_entry; | |
319 | ||
320 | return cru_detect(map_entry, map_offset); | |
321 | } | |
322 | } | |
323 | return -ENODEV; | |
324 | } | |
325 | ||
2d991a16 | 326 | static int detect_cru_service(void) |
7f4da474 TM |
327 | { |
328 | char __iomem *p, *q; | |
329 | int rc = -1; | |
330 | ||
331 | /* | |
332 | * Search from 0x0f0000 through 0x0fffff, inclusive. | |
333 | */ | |
334 | p = ioremap(PCI_ROM_BASE1, ROM_SIZE); | |
335 | if (p == NULL) | |
336 | return -ENOMEM; | |
337 | ||
338 | for (q = p; q < p + ROM_SIZE; q += 16) { | |
339 | rc = bios32_present(q); | |
340 | if (!rc) | |
341 | break; | |
342 | } | |
343 | iounmap(p); | |
344 | return rc; | |
345 | } | |
6b7f3d53 | 346 | /* ------------------------------------------------------------------------- */ |
347 | #endif /* CONFIG_X86_32 */ | |
348 | #ifdef CONFIG_X86_64 | |
7f4da474 TM |
349 | /* --64 Bit Bios------------------------------------------------------------ */ |
350 | ||
351 | #define HPWDT_ARCH 64 | |
352 | ||
1f6ef234 LT |
353 | asm(".text \n\t" |
354 | ".align 4 \n" | |
355 | "asminline_call: \n\t" | |
356 | "pushq %rbp \n\t" | |
357 | "movq %rsp, %rbp \n\t" | |
358 | "pushq %rax \n\t" | |
359 | "pushq %rbx \n\t" | |
360 | "pushq %rdx \n\t" | |
361 | "pushq %r12 \n\t" | |
362 | "pushq %r9 \n\t" | |
363 | "movq %rsi, %r12 \n\t" | |
364 | "movq %rdi, %r9 \n\t" | |
365 | "movl 4(%r9),%ebx \n\t" | |
366 | "movl 8(%r9),%ecx \n\t" | |
367 | "movl 12(%r9),%edx \n\t" | |
368 | "movl 16(%r9),%esi \n\t" | |
369 | "movl 20(%r9),%edi \n\t" | |
370 | "movl (%r9),%eax \n\t" | |
371 | "call *%r12 \n\t" | |
372 | "pushfq \n\t" | |
373 | "popq %r12 \n\t" | |
1f6ef234 LT |
374 | "movl %eax, (%r9) \n\t" |
375 | "movl %ebx, 4(%r9) \n\t" | |
376 | "movl %ecx, 8(%r9) \n\t" | |
377 | "movl %edx, 12(%r9) \n\t" | |
378 | "movl %esi, 16(%r9) \n\t" | |
379 | "movl %edi, 20(%r9) \n\t" | |
380 | "movq %r12, %rax \n\t" | |
381 | "movl %eax, 28(%r9) \n\t" | |
382 | "popq %r9 \n\t" | |
383 | "popq %r12 \n\t" | |
384 | "popq %rdx \n\t" | |
385 | "popq %rbx \n\t" | |
386 | "popq %rax \n\t" | |
387 | "leave \n\t" | |
388 | "ret \n\t" | |
389 | ".previous"); | |
7f4da474 TM |
390 | |
391 | /* | |
392 | * dmi_find_cru | |
393 | * | |
394 | * Routine Description: | |
30ec910e | 395 | * This function checks whether or not a SMBIOS/DMI record is |
7f4da474 | 396 | * the 64bit CRU info or not |
7f4da474 | 397 | */ |
2d991a16 | 398 | static void dmi_find_cru(const struct dmi_header *dm, void *dummy) |
7f4da474 TM |
399 | { |
400 | struct smbios_cru64_info *smbios_cru64_ptr; | |
401 | unsigned long cru_physical_address; | |
402 | ||
403 | if (dm->type == SMBIOS_CRU64_INFORMATION) { | |
404 | smbios_cru64_ptr = (struct smbios_cru64_info *) dm; | |
405 | if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) { | |
406 | cru_physical_address = | |
ab4ba3cd TM |
407 | smbios_cru64_ptr->physical_address + |
408 | smbios_cru64_ptr->double_offset; | |
7f4da474 | 409 | cru_rom_addr = ioremap(cru_physical_address, |
ab4ba3cd | 410 | smbios_cru64_ptr->double_length); |
06026413 BW |
411 | set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK, |
412 | smbios_cru64_ptr->double_length >> PAGE_SHIFT); | |
7f4da474 TM |
413 | } |
414 | } | |
415 | } | |
416 | ||
2d991a16 | 417 | static int detect_cru_service(void) |
7f4da474 TM |
418 | { |
419 | cru_rom_addr = NULL; | |
420 | ||
e7a19c56 | 421 | dmi_walk(dmi_find_cru, NULL); |
7f4da474 TM |
422 | |
423 | /* if cru_rom_addr has been set then we found a CRU service */ | |
ab4ba3cd | 424 | return ((cru_rom_addr != NULL) ? 0 : -ENODEV); |
7f4da474 | 425 | } |
7f4da474 | 426 | /* ------------------------------------------------------------------------- */ |
6b7f3d53 | 427 | #endif /* CONFIG_X86_64 */ |
86ded1f3 | 428 | #endif /* CONFIG_HPWDT_NMI_DECODING */ |
7f4da474 | 429 | |
7f4da474 TM |
430 | /* |
431 | * Watchdog operations | |
432 | */ | |
433 | static void hpwdt_start(void) | |
434 | { | |
e802e32d | 435 | reload = SECS_TO_TICKS(soft_margin); |
7f4da474 | 436 | iowrite16(reload, hpwdt_timer_reg); |
d08c9a33 | 437 | iowrite8(0x85, hpwdt_timer_con); |
7f4da474 TM |
438 | } |
439 | ||
440 | static void hpwdt_stop(void) | |
441 | { | |
442 | unsigned long data; | |
443 | ||
d08c9a33 | 444 | data = ioread8(hpwdt_timer_con); |
7f4da474 | 445 | data &= 0xFE; |
d08c9a33 | 446 | iowrite8(data, hpwdt_timer_con); |
7f4da474 TM |
447 | } |
448 | ||
449 | static void hpwdt_ping(void) | |
450 | { | |
451 | iowrite16(reload, hpwdt_timer_reg); | |
452 | } | |
453 | ||
454 | static int hpwdt_change_timer(int new_margin) | |
455 | { | |
6f681c2e | 456 | if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) { |
27c766aa | 457 | pr_warn("New value passed in is invalid: %d seconds\n", |
7f4da474 TM |
458 | new_margin); |
459 | return -EINVAL; | |
460 | } | |
461 | ||
462 | soft_margin = new_margin; | |
27c766aa | 463 | pr_debug("New timer passed in is %d seconds\n", new_margin); |
e802e32d | 464 | reload = SECS_TO_TICKS(soft_margin); |
7f4da474 TM |
465 | |
466 | return 0; | |
467 | } | |
468 | ||
aae67f36 | 469 | static int hpwdt_time_left(void) |
470 | { | |
471 | return TICKS_TO_SECS(ioread16(hpwdt_timer_reg)); | |
472 | } | |
473 | ||
86ded1f3 | 474 | #ifdef CONFIG_HPWDT_NMI_DECODING |
ab4ba3cd TM |
475 | /* |
476 | * NMI Handler | |
477 | */ | |
9c48f1c6 | 478 | static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs) |
ab4ba3cd TM |
479 | { |
480 | unsigned long rom_pl; | |
481 | static int die_nmi_called; | |
482 | ||
34572b29 | 483 | if (!hpwdt_nmi_decoding) |
243066ba | 484 | goto out; |
485 | ||
486 | spin_lock_irqsave(&rom_lock, rom_pl); | |
5efc7a62 | 487 | if (!die_nmi_called && !is_icru) |
243066ba | 488 | asminline_call(&cmn_regs, cru_rom_addr); |
489 | die_nmi_called = 1; | |
490 | spin_unlock_irqrestore(&rom_lock, rom_pl); | |
dbc018ec NC |
491 | |
492 | if (allow_kdump) | |
493 | hpwdt_stop(); | |
494 | ||
5efc7a62 TM |
495 | if (!is_icru) { |
496 | if (cmn_regs.u1.ral == 0) { | |
dbc018ec | 497 | panic("An NMI occurred, " |
5efc7a62 TM |
498 | "but unable to determine source.\n"); |
499 | } | |
ab4ba3cd | 500 | } |
5efc7a62 TM |
501 | panic("An NMI occurred, please see the Integrated " |
502 | "Management Log for details.\n"); | |
503 | ||
243066ba | 504 | out: |
9c48f1c6 | 505 | return NMI_DONE; |
ab4ba3cd | 506 | } |
86ded1f3 | 507 | #endif /* CONFIG_HPWDT_NMI_DECODING */ |
ab4ba3cd | 508 | |
7f4da474 TM |
509 | /* |
510 | * /dev/watchdog handling | |
511 | */ | |
512 | static int hpwdt_open(struct inode *inode, struct file *file) | |
513 | { | |
514 | /* /dev/watchdog can only be opened once */ | |
515 | if (test_and_set_bit(0, &hpwdt_is_open)) | |
516 | return -EBUSY; | |
517 | ||
518 | /* Start the watchdog */ | |
519 | hpwdt_start(); | |
520 | hpwdt_ping(); | |
521 | ||
522 | return nonseekable_open(inode, file); | |
523 | } | |
524 | ||
525 | static int hpwdt_release(struct inode *inode, struct file *file) | |
526 | { | |
527 | /* Stop the watchdog */ | |
528 | if (expect_release == 42) { | |
529 | hpwdt_stop(); | |
530 | } else { | |
27c766aa | 531 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
7f4da474 TM |
532 | hpwdt_ping(); |
533 | } | |
534 | ||
535 | expect_release = 0; | |
536 | ||
537 | /* /dev/watchdog is being closed, make sure it can be re-opened */ | |
538 | clear_bit(0, &hpwdt_is_open); | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | static ssize_t hpwdt_write(struct file *file, const char __user *data, | |
544 | size_t len, loff_t *ppos) | |
545 | { | |
546 | /* See if we got the magic character 'V' and reload the timer */ | |
547 | if (len) { | |
548 | if (!nowayout) { | |
549 | size_t i; | |
550 | ||
551 | /* note: just in case someone wrote the magic character | |
552 | * five months ago... */ | |
553 | expect_release = 0; | |
554 | ||
555 | /* scan to see whether or not we got the magic char. */ | |
556 | for (i = 0; i != len; i++) { | |
557 | char c; | |
7944d3a5 | 558 | if (get_user(c, data + i)) |
7f4da474 TM |
559 | return -EFAULT; |
560 | if (c == 'V') | |
561 | expect_release = 42; | |
562 | } | |
563 | } | |
564 | ||
565 | /* someone wrote to us, we should reload the timer */ | |
566 | hpwdt_ping(); | |
567 | } | |
568 | ||
569 | return len; | |
570 | } | |
571 | ||
42747d71 | 572 | static const struct watchdog_info ident = { |
7f4da474 TM |
573 | .options = WDIOF_SETTIMEOUT | |
574 | WDIOF_KEEPALIVEPING | | |
575 | WDIOF_MAGICCLOSE, | |
36e3ff44 | 576 | .identity = "HP iLO2+ HW Watchdog Timer", |
7f4da474 TM |
577 | }; |
578 | ||
579 | static long hpwdt_ioctl(struct file *file, unsigned int cmd, | |
580 | unsigned long arg) | |
581 | { | |
582 | void __user *argp = (void __user *)arg; | |
583 | int __user *p = argp; | |
584 | int new_margin; | |
585 | int ret = -ENOTTY; | |
586 | ||
587 | switch (cmd) { | |
588 | case WDIOC_GETSUPPORT: | |
589 | ret = 0; | |
590 | if (copy_to_user(argp, &ident, sizeof(ident))) | |
591 | ret = -EFAULT; | |
592 | break; | |
593 | ||
594 | case WDIOC_GETSTATUS: | |
595 | case WDIOC_GETBOOTSTATUS: | |
596 | ret = put_user(0, p); | |
597 | break; | |
598 | ||
599 | case WDIOC_KEEPALIVE: | |
600 | hpwdt_ping(); | |
601 | ret = 0; | |
602 | break; | |
603 | ||
604 | case WDIOC_SETTIMEOUT: | |
605 | ret = get_user(new_margin, p); | |
606 | if (ret) | |
607 | break; | |
608 | ||
609 | ret = hpwdt_change_timer(new_margin); | |
610 | if (ret) | |
611 | break; | |
612 | ||
613 | hpwdt_ping(); | |
614 | /* Fall */ | |
615 | case WDIOC_GETTIMEOUT: | |
616 | ret = put_user(soft_margin, p); | |
617 | break; | |
aae67f36 | 618 | |
619 | case WDIOC_GETTIMELEFT: | |
620 | ret = put_user(hpwdt_time_left(), p); | |
621 | break; | |
7f4da474 TM |
622 | } |
623 | return ret; | |
624 | } | |
625 | ||
626 | /* | |
627 | * Kernel interfaces | |
628 | */ | |
d5c26a59 | 629 | static const struct file_operations hpwdt_fops = { |
7f4da474 TM |
630 | .owner = THIS_MODULE, |
631 | .llseek = no_llseek, | |
632 | .write = hpwdt_write, | |
633 | .unlocked_ioctl = hpwdt_ioctl, | |
634 | .open = hpwdt_open, | |
635 | .release = hpwdt_release, | |
636 | }; | |
637 | ||
638 | static struct miscdevice hpwdt_miscdev = { | |
639 | .minor = WATCHDOG_MINOR, | |
640 | .name = "watchdog", | |
641 | .fops = &hpwdt_fops, | |
642 | }; | |
643 | ||
7f4da474 TM |
644 | /* |
645 | * Init & Exit | |
646 | */ | |
647 | ||
86ded1f3 | 648 | #ifdef CONFIG_HPWDT_NMI_DECODING |
4a7863cc | 649 | #ifdef CONFIG_X86_LOCAL_APIC |
2d991a16 | 650 | static void hpwdt_check_nmi_decoding(struct pci_dev *dev) |
47bece87 TM |
651 | { |
652 | /* | |
653 | * If nmi_watchdog is turned off then we can turn on | |
34572b29 | 654 | * our nmi decoding capability. |
47bece87 | 655 | */ |
072b198a | 656 | hpwdt_nmi_decoding = 1; |
47bece87 TM |
657 | } |
658 | #else | |
2d991a16 | 659 | static void hpwdt_check_nmi_decoding(struct pci_dev *dev) |
47bece87 | 660 | { |
34572b29 | 661 | dev_warn(&dev->dev, "NMI decoding is disabled. " |
47bece87 TM |
662 | "Your kernel does not support a NMI Watchdog.\n"); |
663 | } | |
4a7863cc | 664 | #endif /* CONFIG_X86_LOCAL_APIC */ |
2ec7ed67 | 665 | |
5efc7a62 TM |
666 | /* |
667 | * dmi_find_icru | |
668 | * | |
669 | * Routine Description: | |
670 | * This function checks whether or not we are on an iCRU-based server. | |
671 | * This check is independent of architecture and needs to be made for | |
672 | * any ProLiant system. | |
673 | */ | |
2d991a16 | 674 | static void dmi_find_icru(const struct dmi_header *dm, void *dummy) |
5efc7a62 TM |
675 | { |
676 | struct smbios_proliant_info *smbios_proliant_ptr; | |
677 | ||
678 | if (dm->type == SMBIOS_ICRU_INFORMATION) { | |
679 | smbios_proliant_ptr = (struct smbios_proliant_info *) dm; | |
680 | if (smbios_proliant_ptr->misc_features & 0x01) | |
681 | is_icru = 1; | |
682 | } | |
683 | } | |
684 | ||
2d991a16 | 685 | static int hpwdt_init_nmi_decoding(struct pci_dev *dev) |
2ec7ed67 | 686 | { |
687 | int retval; | |
688 | ||
689 | /* | |
5efc7a62 TM |
690 | * On typical CRU-based systems we need to map that service in |
691 | * the BIOS. For 32 bit Operating Systems we need to go through | |
692 | * the 32 Bit BIOS Service Directory. For 64 bit Operating | |
693 | * Systems we get that service through SMBIOS. | |
694 | * | |
695 | * On systems that support the new iCRU service all we need to | |
696 | * do is call dmi_walk to get the supported flag value and skip | |
697 | * the old cru detect code. | |
2ec7ed67 | 698 | */ |
5efc7a62 TM |
699 | dmi_walk(dmi_find_icru, NULL); |
700 | if (!is_icru) { | |
701 | ||
702 | /* | |
703 | * We need to map the ROM to get the CRU service. | |
704 | * For 32 bit Operating Systems we need to go through the 32 Bit | |
705 | * BIOS Service Directory | |
706 | * For 64 bit Operating Systems we get that service through SMBIOS. | |
707 | */ | |
708 | retval = detect_cru_service(); | |
709 | if (retval < 0) { | |
710 | dev_warn(&dev->dev, | |
711 | "Unable to detect the %d Bit CRU Service.\n", | |
712 | HPWDT_ARCH); | |
713 | return retval; | |
714 | } | |
2ec7ed67 | 715 | |
5efc7a62 TM |
716 | /* |
717 | * We know this is the only CRU call we need to make so lets keep as | |
718 | * few instructions as possible once the NMI comes in. | |
719 | */ | |
720 | cmn_regs.u1.rah = 0x0D; | |
721 | cmn_regs.u1.ral = 0x02; | |
722 | } | |
2ec7ed67 | 723 | |
724 | /* | |
09ee1014 | 725 | * Only one function can register for NMI_UNKNOWN |
2ec7ed67 | 726 | */ |
09ee1014 | 727 | retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt"); |
553222f3 DZ |
728 | if (retval) |
729 | goto error; | |
730 | retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt"); | |
731 | if (retval) | |
732 | goto error1; | |
733 | retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt"); | |
734 | if (retval) | |
735 | goto error2; | |
2ec7ed67 | 736 | |
737 | dev_info(&dev->dev, | |
738 | "HP Watchdog Timer Driver: NMI decoding initialized" | |
09ee1014 DZ |
739 | ", allow kernel dump: %s (default = 0/OFF)\n", |
740 | (allow_kdump == 0) ? "OFF" : "ON"); | |
2ec7ed67 | 741 | return 0; |
553222f3 DZ |
742 | |
743 | error2: | |
744 | unregister_nmi_handler(NMI_SERR, "hpwdt"); | |
745 | error1: | |
746 | unregister_nmi_handler(NMI_UNKNOWN, "hpwdt"); | |
747 | error: | |
748 | dev_warn(&dev->dev, | |
749 | "Unable to register a die notifier (err=%d).\n", | |
750 | retval); | |
751 | if (cru_rom_addr) | |
752 | iounmap(cru_rom_addr); | |
753 | return retval; | |
2ec7ed67 | 754 | } |
755 | ||
b77b7088 | 756 | static void hpwdt_exit_nmi_decoding(void) |
2ec7ed67 | 757 | { |
9c48f1c6 | 758 | unregister_nmi_handler(NMI_UNKNOWN, "hpwdt"); |
a089361c MT |
759 | unregister_nmi_handler(NMI_SERR, "hpwdt"); |
760 | unregister_nmi_handler(NMI_IO_CHECK, "hpwdt"); | |
2ec7ed67 | 761 | if (cru_rom_addr) |
762 | iounmap(cru_rom_addr); | |
763 | } | |
86ded1f3 | 764 | #else /* !CONFIG_HPWDT_NMI_DECODING */ |
2d991a16 | 765 | static void hpwdt_check_nmi_decoding(struct pci_dev *dev) |
86ded1f3 | 766 | { |
767 | } | |
768 | ||
2d991a16 | 769 | static int hpwdt_init_nmi_decoding(struct pci_dev *dev) |
86ded1f3 | 770 | { |
771 | return 0; | |
772 | } | |
773 | ||
b77b7088 | 774 | static void hpwdt_exit_nmi_decoding(void) |
86ded1f3 | 775 | { |
776 | } | |
777 | #endif /* CONFIG_HPWDT_NMI_DECODING */ | |
47bece87 | 778 | |
2d991a16 | 779 | static int hpwdt_init_one(struct pci_dev *dev, |
ab4ba3cd | 780 | const struct pci_device_id *ent) |
7f4da474 TM |
781 | { |
782 | int retval; | |
783 | ||
47bece87 | 784 | /* |
34572b29 | 785 | * Check if we can do NMI decoding or not |
47bece87 | 786 | */ |
34572b29 | 787 | hpwdt_check_nmi_decoding(dev); |
47bece87 | 788 | |
7f4da474 | 789 | /* |
36e3ff44 | 790 | * First let's find out if we are on an iLO2+ server. We will |
7f4da474 | 791 | * not run on a legacy ASM box. |
ab4ba3cd | 792 | * So we only support the G5 ProLiant servers and higher. |
7f4da474 TM |
793 | */ |
794 | if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) { | |
795 | dev_warn(&dev->dev, | |
36e3ff44 | 796 | "This server does not have an iLO2+ ASIC.\n"); |
7f4da474 TM |
797 | return -ENODEV; |
798 | } | |
799 | ||
800 | if (pci_enable_device(dev)) { | |
801 | dev_warn(&dev->dev, | |
802 | "Not possible to enable PCI Device: 0x%x:0x%x.\n", | |
803 | ent->vendor, ent->device); | |
804 | return -ENODEV; | |
805 | } | |
806 | ||
807 | pci_mem_addr = pci_iomap(dev, 1, 0x80); | |
808 | if (!pci_mem_addr) { | |
809 | dev_warn(&dev->dev, | |
36e3ff44 | 810 | "Unable to detect the iLO2+ server memory.\n"); |
7f4da474 TM |
811 | retval = -ENOMEM; |
812 | goto error_pci_iomap; | |
813 | } | |
814 | hpwdt_timer_reg = pci_mem_addr + 0x70; | |
815 | hpwdt_timer_con = pci_mem_addr + 0x72; | |
816 | ||
308b135e TK |
817 | /* Make sure that timer is disabled until /dev/watchdog is opened */ |
818 | hpwdt_stop(); | |
819 | ||
7f4da474 TM |
820 | /* Make sure that we have a valid soft_margin */ |
821 | if (hpwdt_change_timer(soft_margin)) | |
822 | hpwdt_change_timer(DEFAULT_MARGIN); | |
823 | ||
2ec7ed67 | 824 | /* Initialize NMI Decoding functionality */ |
825 | retval = hpwdt_init_nmi_decoding(dev); | |
826 | if (retval != 0) | |
827 | goto error_init_nmi_decoding; | |
7f4da474 TM |
828 | |
829 | retval = misc_register(&hpwdt_miscdev); | |
830 | if (retval < 0) { | |
831 | dev_warn(&dev->dev, | |
832 | "Unable to register miscdev on minor=%d (err=%d).\n", | |
833 | WATCHDOG_MINOR, retval); | |
834 | goto error_misc_register; | |
835 | } | |
836 | ||
2ec7ed67 | 837 | dev_info(&dev->dev, "HP Watchdog Timer Driver: %s" |
838 | ", timer margin: %d seconds (nowayout=%d).\n", | |
839 | HPWDT_VERSION, soft_margin, nowayout); | |
7f4da474 TM |
840 | return 0; |
841 | ||
842 | error_misc_register: | |
2ec7ed67 | 843 | hpwdt_exit_nmi_decoding(); |
844 | error_init_nmi_decoding: | |
7f4da474 TM |
845 | pci_iounmap(dev, pci_mem_addr); |
846 | error_pci_iomap: | |
847 | pci_disable_device(dev); | |
848 | return retval; | |
849 | } | |
850 | ||
4b12b896 | 851 | static void hpwdt_exit(struct pci_dev *dev) |
7f4da474 TM |
852 | { |
853 | if (!nowayout) | |
854 | hpwdt_stop(); | |
855 | ||
856 | misc_deregister(&hpwdt_miscdev); | |
2ec7ed67 | 857 | hpwdt_exit_nmi_decoding(); |
7f4da474 TM |
858 | pci_iounmap(dev, pci_mem_addr); |
859 | pci_disable_device(dev); | |
860 | } | |
861 | ||
862 | static struct pci_driver hpwdt_driver = { | |
863 | .name = "hpwdt", | |
864 | .id_table = hpwdt_devices, | |
865 | .probe = hpwdt_init_one, | |
82268714 | 866 | .remove = hpwdt_exit, |
7f4da474 TM |
867 | }; |
868 | ||
7f4da474 TM |
869 | MODULE_AUTHOR("Tom Mingarelli"); |
870 | MODULE_DESCRIPTION("hp watchdog driver"); | |
871 | MODULE_LICENSE("GPL"); | |
d8100c3a | 872 | MODULE_VERSION(HPWDT_VERSION); |
7f4da474 TM |
873 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
874 | ||
875 | module_param(soft_margin, int, 0); | |
876 | MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds"); | |
877 | ||
86a1e189 | 878 | module_param(nowayout, bool, 0); |
7f4da474 TM |
879 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
880 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
881 | ||
86ded1f3 | 882 | #ifdef CONFIG_HPWDT_NMI_DECODING |
550d299e | 883 | module_param(allow_kdump, int, 0); |
884 | MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs"); | |
86ded1f3 | 885 | #endif /* !CONFIG_HPWDT_NMI_DECODING */ |
44df7535 | 886 | |
5ce9c371 | 887 | module_pci_driver(hpwdt_driver); |