blob: de7e4f497222ffc858d2df762c27003c08874722 [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
Joe Perches27c766a2012-02-15 15:06:19 -080016#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000018#include <linux/device.h>
19#include <linux/fs.h>
20#include <linux/init.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000021#include <linux/io.h>
dann fraziera52e6d12010-07-27 17:50:50 -060022#include <linux/bitops.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000023#include <linux/kernel.h>
24#include <linux/miscdevice.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000025#include <linux/module.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000026#include <linux/moduleparam.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000027#include <linux/pci.h>
28#include <linux/pci_ids.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000029#include <linux/types.h>
30#include <linux/uaccess.h>
31#include <linux/watchdog.h>
dann frazier86ded1f2010-07-27 17:51:02 -060032#ifdef CONFIG_HPWDT_NMI_DECODING
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000033#include <linux/dmi.h>
dann fraziera52e6d12010-07-27 17:50:50 -060034#include <linux/spinlock.h>
dann frazier923410d2010-07-27 17:50:54 -060035#include <linux/nmi.h>
36#include <linux/kdebug.h>
37#include <linux/notifier.h>
Bernhard Walle06026412008-11-14 15:47:03 +010038#include <asm/cacheflush.h>
dann frazier86ded1f2010-07-27 17:51:02 -060039#endif /* CONFIG_HPWDT_NMI_DECODING */
Ingo Molnard48b0e12011-10-06 14:20:27 +020040#include <asm/nmi.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000041
Mingarelli, Thomascce78da2013-07-09 23:04:55 +000042#define HPWDT_VERSION "1.3.2"
dann fraziere802e322010-06-02 16:23:39 -060043#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
dann frazier6f681c22010-06-02 16:23:40 -060044#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
45#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)
dann frazier923410d2010-07-27 17:50:54 -060046#define DEFAULT_MARGIN 30
47
48static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
49static unsigned int reload; /* the computed soft_margin */
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +010050static bool nowayout = WATCHDOG_NOWAYOUT;
dann frazier923410d2010-07-27 17:50:54 -060051static 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
Wim Van Sebroeck4562f532011-02-21 12:16:44 +000058static DEFINE_PCI_DEVICE_TABLE(hpwdt_devices) = {
dann frazier36e3ff42010-07-27 17:50:57 -060059 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */
60 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */
dann frazier923410d2010-07-27 17:50:54 -060061 {0}, /* terminate list */
62};
63MODULE_DEVICE_TABLE(pci, hpwdt_devices);
64
dann frazier86ded1f2010-07-27 17:51:02 -060065#ifdef CONFIG_HPWDT_NMI_DECODING
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000066#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
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000081/* 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
Thomas Mingarelli5efc7a62011-07-26 14:05:53 +010093/* 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
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000106struct 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
dann frazier34572b22010-07-27 17:51:01 -0600148static unsigned int hpwdt_nmi_decoding;
Mingarelli, Thomasa0893612012-06-26 10:27:00 +0200149static unsigned int allow_kdump = 1;
Thomas Mingarelli5efc7a62011-07-26 14:05:53 +0100150static unsigned int is_icru;
Mingarelli, Thomascce78da2013-07-09 23:04:55 +0000151static unsigned int is_uefi;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000152static DEFINE_SPINLOCK(rom_lock);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000153static void *cru_rom_addr;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000154static struct cmn_registers cmn_regs;
155
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +0000156extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
157 unsigned long *pRomEntry);
Linus Torvalds1f6ef2342008-06-20 12:19:28 -0700158
dann frazier6b7f3d52010-07-27 17:50:59 -0600159#ifdef CONFIG_X86_32
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000160/* --32 Bit Bios------------------------------------------------------------ */
161
162#define HPWDT_ARCH 32
163
Linus Torvalds1f6ef2342008-06-20 12:19:28 -0700164asm(".text \n\t"
165 ".align 4 \n"
166 "asminline_call: \n\t"
167 "pushl %ebp \n\t"
168 "movl %esp, %ebp \n\t"
169 "pusha \n\t"
170 "pushf \n\t"
171 "push %es \n\t"
172 "push %ds \n\t"
173 "pop %es \n\t"
174 "movl 8(%ebp),%eax \n\t"
175 "movl 4(%eax),%ebx \n\t"
176 "movl 8(%eax),%ecx \n\t"
177 "movl 12(%eax),%edx \n\t"
178 "movl 16(%eax),%esi \n\t"
179 "movl 20(%eax),%edi \n\t"
180 "movl (%eax),%eax \n\t"
181 "push %cs \n\t"
182 "call *12(%ebp) \n\t"
183 "pushf \n\t"
184 "pushl %eax \n\t"
185 "movl 8(%ebp),%eax \n\t"
186 "movl %ebx,4(%eax) \n\t"
187 "movl %ecx,8(%eax) \n\t"
188 "movl %edx,12(%eax) \n\t"
189 "movl %esi,16(%eax) \n\t"
190 "movl %edi,20(%eax) \n\t"
191 "movw %ds,24(%eax) \n\t"
192 "movw %es,26(%eax) \n\t"
193 "popl %ebx \n\t"
194 "movl %ebx,(%eax) \n\t"
195 "popl %ebx \n\t"
196 "movl %ebx,28(%eax) \n\t"
197 "pop %es \n\t"
198 "popf \n\t"
199 "popa \n\t"
200 "leave \n\t"
201 "ret \n\t"
202 ".previous");
203
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000204
205/*
206 * cru_detect
207 *
208 * Routine Description:
209 * This function uses the 32-bit BIOS Service Directory record to
210 * search for a $CRU record.
211 *
212 * Return Value:
213 * 0 : SUCCESS
214 * <0 : FAILURE
215 */
Bill Pemberton2d991a12012-11-19 13:21:41 -0500216static int cru_detect(unsigned long map_entry,
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000217 unsigned long map_offset)
218{
219 void *bios32_map;
220 unsigned long *bios32_entrypoint;
221 unsigned long cru_physical_address;
222 unsigned long cru_length;
223 unsigned long physical_bios_base = 0;
224 unsigned long physical_bios_offset = 0;
225 int retval = -ENODEV;
226
227 bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
228
229 if (bios32_map == NULL)
230 return -ENODEV;
231
232 bios32_entrypoint = bios32_map + map_offset;
233
234 cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
235
Maxim Uvarov97d2a102012-01-15 20:02:50 -0800236 set_memory_x((unsigned long)bios32_map, 2);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000237 asminline_call(&cmn_regs, bios32_entrypoint);
238
239 if (cmn_regs.u1.ral != 0) {
Joe Perches27c766a2012-02-15 15:06:19 -0800240 pr_warn("Call succeeded but with an error: 0x%x\n",
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000241 cmn_regs.u1.ral);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000242 } else {
243 physical_bios_base = cmn_regs.u2.rebx;
244 physical_bios_offset = cmn_regs.u4.redx;
245 cru_length = cmn_regs.u3.recx;
246 cru_physical_address =
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000247 physical_bios_base + physical_bios_offset;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000248
249 /* If the values look OK, then map it in. */
250 if ((physical_bios_base + physical_bios_offset)) {
251 cru_rom_addr =
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000252 ioremap(cru_physical_address, cru_length);
Mingarelli, Thomase67d6682011-11-07 10:59:00 +0100253 if (cru_rom_addr) {
Maxim Uvarov97d2a102012-01-15 20:02:50 -0800254 set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
255 (cru_length + PAGE_SIZE - 1) >> PAGE_SHIFT);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000256 retval = 0;
Mingarelli, Thomase67d6682011-11-07 10:59:00 +0100257 }
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000258 }
259
Joe Perches27c766a2012-02-15 15:06:19 -0800260 pr_debug("CRU Base Address: 0x%lx\n", physical_bios_base);
261 pr_debug("CRU Offset Address: 0x%lx\n", physical_bios_offset);
262 pr_debug("CRU Length: 0x%lx\n", cru_length);
263 pr_debug("CRU Mapped Address: %p\n", &cru_rom_addr);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000264 }
265 iounmap(bios32_map);
266 return retval;
267}
268
269/*
Roland Dreier30ec9102008-02-28 12:34:42 -0800270 * bios_checksum
271 */
Bill Pemberton2d991a12012-11-19 13:21:41 -0500272static int bios_checksum(const char __iomem *ptr, int len)
Roland Dreier30ec9102008-02-28 12:34:42 -0800273{
274 char sum = 0;
275 int i;
276
277 /*
278 * calculate checksum of size bytes. This should add up
279 * to zero if we have a valid header.
280 */
281 for (i = 0; i < len; i++)
282 sum += ptr[i];
283
284 return ((sum == 0) && (len > 0));
285}
286
287/*
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000288 * bios32_present
289 *
290 * Routine Description:
291 * This function finds the 32-bit BIOS Service Directory
292 *
293 * Return Value:
294 * 0 : SUCCESS
295 * <0 : FAILURE
296 */
Bill Pemberton2d991a12012-11-19 13:21:41 -0500297static int bios32_present(const char __iomem *p)
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000298{
299 struct bios32_service_dir *bios_32_ptr;
300 int length;
301 unsigned long map_entry, map_offset;
302
303 bios_32_ptr = (struct bios32_service_dir *) p;
304
305 /*
306 * Search for signature by checking equal to the swizzled value
307 * instead of calling another routine to perform a strcmp.
308 */
309 if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
310 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
311 if (bios_checksum(p, length)) {
312 /*
313 * According to the spec, we're looking for the
314 * first 4KB-aligned address below the entrypoint
315 * listed in the header. The Service Directory code
316 * is guaranteed to occupy no more than 2 4KB pages.
317 */
318 map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
319 map_offset = bios_32_ptr->entry_point - map_entry;
320
321 return cru_detect(map_entry, map_offset);
322 }
323 }
324 return -ENODEV;
325}
326
Bill Pemberton2d991a12012-11-19 13:21:41 -0500327static int detect_cru_service(void)
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000328{
329 char __iomem *p, *q;
330 int rc = -1;
331
332 /*
333 * Search from 0x0f0000 through 0x0fffff, inclusive.
334 */
335 p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
336 if (p == NULL)
337 return -ENOMEM;
338
339 for (q = p; q < p + ROM_SIZE; q += 16) {
340 rc = bios32_present(q);
341 if (!rc)
342 break;
343 }
344 iounmap(p);
345 return rc;
346}
dann frazier6b7f3d52010-07-27 17:50:59 -0600347/* ------------------------------------------------------------------------- */
348#endif /* CONFIG_X86_32 */
349#ifdef CONFIG_X86_64
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000350/* --64 Bit Bios------------------------------------------------------------ */
351
352#define HPWDT_ARCH 64
353
Linus Torvalds1f6ef2342008-06-20 12:19:28 -0700354asm(".text \n\t"
355 ".align 4 \n"
356 "asminline_call: \n\t"
357 "pushq %rbp \n\t"
358 "movq %rsp, %rbp \n\t"
359 "pushq %rax \n\t"
360 "pushq %rbx \n\t"
361 "pushq %rdx \n\t"
362 "pushq %r12 \n\t"
363 "pushq %r9 \n\t"
364 "movq %rsi, %r12 \n\t"
365 "movq %rdi, %r9 \n\t"
366 "movl 4(%r9),%ebx \n\t"
367 "movl 8(%r9),%ecx \n\t"
368 "movl 12(%r9),%edx \n\t"
369 "movl 16(%r9),%esi \n\t"
370 "movl 20(%r9),%edi \n\t"
371 "movl (%r9),%eax \n\t"
372 "call *%r12 \n\t"
373 "pushfq \n\t"
374 "popq %r12 \n\t"
Linus Torvalds1f6ef2342008-06-20 12:19:28 -0700375 "movl %eax, (%r9) \n\t"
376 "movl %ebx, 4(%r9) \n\t"
377 "movl %ecx, 8(%r9) \n\t"
378 "movl %edx, 12(%r9) \n\t"
379 "movl %esi, 16(%r9) \n\t"
380 "movl %edi, 20(%r9) \n\t"
381 "movq %r12, %rax \n\t"
382 "movl %eax, 28(%r9) \n\t"
383 "popq %r9 \n\t"
384 "popq %r12 \n\t"
385 "popq %rdx \n\t"
386 "popq %rbx \n\t"
387 "popq %rax \n\t"
388 "leave \n\t"
389 "ret \n\t"
390 ".previous");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000391
392/*
393 * dmi_find_cru
394 *
395 * Routine Description:
Roland Dreier30ec9102008-02-28 12:34:42 -0800396 * This function checks whether or not a SMBIOS/DMI record is
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000397 * the 64bit CRU info or not
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000398 */
Bill Pemberton2d991a12012-11-19 13:21:41 -0500399static void dmi_find_cru(const struct dmi_header *dm, void *dummy)
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000400{
401 struct smbios_cru64_info *smbios_cru64_ptr;
402 unsigned long cru_physical_address;
403
404 if (dm->type == SMBIOS_CRU64_INFORMATION) {
405 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
406 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
407 cru_physical_address =
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000408 smbios_cru64_ptr->physical_address +
409 smbios_cru64_ptr->double_offset;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000410 cru_rom_addr = ioremap(cru_physical_address,
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000411 smbios_cru64_ptr->double_length);
Bernhard Walle06026412008-11-14 15:47:03 +0100412 set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
413 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000414 }
415 }
416}
417
Bill Pemberton2d991a12012-11-19 13:21:41 -0500418static int detect_cru_service(void)
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000419{
420 cru_rom_addr = NULL;
421
Jean Delvaree7a19c562009-03-30 21:46:44 +0200422 dmi_walk(dmi_find_cru, NULL);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000423
424 /* if cru_rom_addr has been set then we found a CRU service */
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000425 return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000426}
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000427/* ------------------------------------------------------------------------- */
dann frazier6b7f3d52010-07-27 17:50:59 -0600428#endif /* CONFIG_X86_64 */
dann frazier86ded1f2010-07-27 17:51:02 -0600429#endif /* CONFIG_HPWDT_NMI_DECODING */
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000430
431/*
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000432 * Watchdog operations
433 */
434static void hpwdt_start(void)
435{
dann fraziere802e322010-06-02 16:23:39 -0600436 reload = SECS_TO_TICKS(soft_margin);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000437 iowrite16(reload, hpwdt_timer_reg);
Mingarelli, Thomasd08c9a32012-04-03 05:37:01 +0000438 iowrite8(0x85, hpwdt_timer_con);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000439}
440
441static void hpwdt_stop(void)
442{
443 unsigned long data;
444
Mingarelli, Thomasd08c9a32012-04-03 05:37:01 +0000445 data = ioread8(hpwdt_timer_con);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000446 data &= 0xFE;
Mingarelli, Thomasd08c9a32012-04-03 05:37:01 +0000447 iowrite8(data, hpwdt_timer_con);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000448}
449
450static void hpwdt_ping(void)
451{
452 iowrite16(reload, hpwdt_timer_reg);
453}
454
455static int hpwdt_change_timer(int new_margin)
456{
dann frazier6f681c22010-06-02 16:23:40 -0600457 if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
Joe Perches27c766a2012-02-15 15:06:19 -0800458 pr_warn("New value passed in is invalid: %d seconds\n",
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000459 new_margin);
460 return -EINVAL;
461 }
462
463 soft_margin = new_margin;
Joe Perches27c766a2012-02-15 15:06:19 -0800464 pr_debug("New timer passed in is %d seconds\n", new_margin);
dann fraziere802e322010-06-02 16:23:39 -0600465 reload = SECS_TO_TICKS(soft_margin);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000466
467 return 0;
468}
469
dann frazieraae67f32010-06-02 16:23:41 -0600470static int hpwdt_time_left(void)
471{
472 return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
473}
474
dann frazier86ded1f2010-07-27 17:51:02 -0600475#ifdef CONFIG_HPWDT_NMI_DECODING
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000476/*
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000477 * NMI Handler
478 */
Don Zickus9c48f1c2011-09-30 15:06:21 -0400479static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000480{
481 unsigned long rom_pl;
482 static int die_nmi_called;
483
dann frazier34572b22010-07-27 17:51:01 -0600484 if (!hpwdt_nmi_decoding)
dann frazier243066b2010-07-27 17:50:49 -0600485 goto out;
486
487 spin_lock_irqsave(&rom_lock, rom_pl);
Mingarelli, Thomascce78da2013-07-09 23:04:55 +0000488 if (!die_nmi_called && !is_icru && !is_uefi)
dann frazier243066b2010-07-27 17:50:49 -0600489 asminline_call(&cmn_regs, cru_rom_addr);
490 die_nmi_called = 1;
491 spin_unlock_irqrestore(&rom_lock, rom_pl);
Thomas Mingarelli5efc7a62011-07-26 14:05:53 +0100492
493 if (allow_kdump)
494 hpwdt_stop();
Naga Chumbalkardbc018e2011-08-09 22:27:26 +0000495
Mingarelli, Thomascce78da2013-07-09 23:04:55 +0000496 if (!is_icru && !is_uefi) {
Naga Chumbalkardbc018e2011-08-09 22:27:26 +0000497 if (cmn_regs.u1.ral == 0) {
498 panic("An NMI occurred, "
499 "but unable to determine source.\n");
500 }
501 }
Thomas Mingarelli5efc7a62011-07-26 14:05:53 +0100502 panic("An NMI occurred, please see the Integrated "
503 "Management Log for details.\n");
504
dann frazier243066b2010-07-27 17:50:49 -0600505out:
Don Zickus9c48f1c2011-09-30 15:06:21 -0400506 return NMI_DONE;
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000507}
dann frazier86ded1f2010-07-27 17:51:02 -0600508#endif /* CONFIG_HPWDT_NMI_DECODING */
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000509
510/*
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000511 * /dev/watchdog handling
512 */
513static int hpwdt_open(struct inode *inode, struct file *file)
514{
515 /* /dev/watchdog can only be opened once */
516 if (test_and_set_bit(0, &hpwdt_is_open))
517 return -EBUSY;
518
519 /* Start the watchdog */
520 hpwdt_start();
521 hpwdt_ping();
522
523 return nonseekable_open(inode, file);
524}
525
526static int hpwdt_release(struct inode *inode, struct file *file)
527{
528 /* Stop the watchdog */
529 if (expect_release == 42) {
530 hpwdt_stop();
531 } else {
Joe Perches27c766a2012-02-15 15:06:19 -0800532 pr_crit("Unexpected close, not stopping watchdog!\n");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000533 hpwdt_ping();
534 }
535
536 expect_release = 0;
537
538 /* /dev/watchdog is being closed, make sure it can be re-opened */
539 clear_bit(0, &hpwdt_is_open);
540
541 return 0;
542}
543
544static ssize_t hpwdt_write(struct file *file, const char __user *data,
545 size_t len, loff_t *ppos)
546{
547 /* See if we got the magic character 'V' and reload the timer */
548 if (len) {
549 if (!nowayout) {
550 size_t i;
551
552 /* note: just in case someone wrote the magic character
553 * five months ago... */
554 expect_release = 0;
555
556 /* scan to see whether or not we got the magic char. */
557 for (i = 0; i != len; i++) {
558 char c;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000559 if (get_user(c, data + i))
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000560 return -EFAULT;
561 if (c == 'V')
562 expect_release = 42;
563 }
564 }
565
566 /* someone wrote to us, we should reload the timer */
567 hpwdt_ping();
568 }
569
570 return len;
571}
572
Wim Van Sebroeck42747d72009-12-26 18:55:22 +0000573static const struct watchdog_info ident = {
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000574 .options = WDIOF_SETTIMEOUT |
575 WDIOF_KEEPALIVEPING |
576 WDIOF_MAGICCLOSE,
dann frazier36e3ff42010-07-27 17:50:57 -0600577 .identity = "HP iLO2+ HW Watchdog Timer",
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000578};
579
580static long hpwdt_ioctl(struct file *file, unsigned int cmd,
581 unsigned long arg)
582{
583 void __user *argp = (void __user *)arg;
584 int __user *p = argp;
585 int new_margin;
586 int ret = -ENOTTY;
587
588 switch (cmd) {
589 case WDIOC_GETSUPPORT:
590 ret = 0;
591 if (copy_to_user(argp, &ident, sizeof(ident)))
592 ret = -EFAULT;
593 break;
594
595 case WDIOC_GETSTATUS:
596 case WDIOC_GETBOOTSTATUS:
597 ret = put_user(0, p);
598 break;
599
600 case WDIOC_KEEPALIVE:
601 hpwdt_ping();
602 ret = 0;
603 break;
604
605 case WDIOC_SETTIMEOUT:
606 ret = get_user(new_margin, p);
607 if (ret)
608 break;
609
610 ret = hpwdt_change_timer(new_margin);
611 if (ret)
612 break;
613
614 hpwdt_ping();
615 /* Fall */
616 case WDIOC_GETTIMEOUT:
617 ret = put_user(soft_margin, p);
618 break;
dann frazieraae67f32010-06-02 16:23:41 -0600619
620 case WDIOC_GETTIMELEFT:
621 ret = put_user(hpwdt_time_left(), p);
622 break;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000623 }
624 return ret;
625}
626
627/*
628 * Kernel interfaces
629 */
Wim Van Sebroeckd5c26a52009-03-18 08:18:43 +0000630static const struct file_operations hpwdt_fops = {
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000631 .owner = THIS_MODULE,
632 .llseek = no_llseek,
633 .write = hpwdt_write,
634 .unlocked_ioctl = hpwdt_ioctl,
635 .open = hpwdt_open,
636 .release = hpwdt_release,
637};
638
639static struct miscdevice hpwdt_miscdev = {
640 .minor = WATCHDOG_MINOR,
641 .name = "watchdog",
642 .fops = &hpwdt_fops,
643};
644
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000645/*
646 * Init & Exit
647 */
648
dann frazier86ded1f2010-07-27 17:51:02 -0600649#ifdef CONFIG_HPWDT_NMI_DECODING
Don Zickus4a7863c2010-12-22 14:00:03 -0500650#ifdef CONFIG_X86_LOCAL_APIC
Bill Pemberton2d991a12012-11-19 13:21:41 -0500651static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000652{
653 /*
654 * If nmi_watchdog is turned off then we can turn on
dann frazier34572b22010-07-27 17:51:01 -0600655 * our nmi decoding capability.
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000656 */
Don Zickus072b1982010-11-12 11:22:24 -0500657 hpwdt_nmi_decoding = 1;
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000658}
659#else
Bill Pemberton2d991a12012-11-19 13:21:41 -0500660static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000661{
dann frazier34572b22010-07-27 17:51:01 -0600662 dev_warn(&dev->dev, "NMI decoding is disabled. "
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000663 "Your kernel does not support a NMI Watchdog.\n");
664}
Don Zickus4a7863c2010-12-22 14:00:03 -0500665#endif /* CONFIG_X86_LOCAL_APIC */
dann frazier2ec7ed62010-07-28 12:38:43 -0600666
Thomas Mingarelli5efc7a62011-07-26 14:05:53 +0100667/*
668 * dmi_find_icru
669 *
670 * Routine Description:
671 * This function checks whether or not we are on an iCRU-based server.
672 * This check is independent of architecture and needs to be made for
673 * any ProLiant system.
674 */
Bill Pemberton2d991a12012-11-19 13:21:41 -0500675static void dmi_find_icru(const struct dmi_header *dm, void *dummy)
Thomas Mingarelli5efc7a62011-07-26 14:05:53 +0100676{
677 struct smbios_proliant_info *smbios_proliant_ptr;
678
679 if (dm->type == SMBIOS_ICRU_INFORMATION) {
680 smbios_proliant_ptr = (struct smbios_proliant_info *) dm;
681 if (smbios_proliant_ptr->misc_features & 0x01)
682 is_icru = 1;
Mingarelli, Thomascce78da2013-07-09 23:04:55 +0000683 if (smbios_proliant_ptr->misc_features & 0x408)
684 is_uefi = 1;
Thomas Mingarelli5efc7a62011-07-26 14:05:53 +0100685 }
686}
687
Bill Pemberton2d991a12012-11-19 13:21:41 -0500688static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
dann frazier2ec7ed62010-07-28 12:38:43 -0600689{
690 int retval;
691
692 /*
Thomas Mingarelli5efc7a62011-07-26 14:05:53 +0100693 * On typical CRU-based systems we need to map that service in
694 * the BIOS. For 32 bit Operating Systems we need to go through
695 * the 32 Bit BIOS Service Directory. For 64 bit Operating
696 * Systems we get that service through SMBIOS.
697 *
698 * On systems that support the new iCRU service all we need to
699 * do is call dmi_walk to get the supported flag value and skip
700 * the old cru detect code.
dann frazier2ec7ed62010-07-28 12:38:43 -0600701 */
Thomas Mingarelli5efc7a62011-07-26 14:05:53 +0100702 dmi_walk(dmi_find_icru, NULL);
Mingarelli, Thomascce78da2013-07-09 23:04:55 +0000703 if (!is_icru && !is_uefi) {
dann frazier2ec7ed62010-07-28 12:38:43 -0600704
Thomas Mingarelli5efc7a62011-07-26 14:05:53 +0100705 /*
706 * We need to map the ROM to get the CRU service.
707 * For 32 bit Operating Systems we need to go through the 32 Bit
708 * BIOS Service Directory
709 * For 64 bit Operating Systems we get that service through SMBIOS.
710 */
711 retval = detect_cru_service();
712 if (retval < 0) {
713 dev_warn(&dev->dev,
714 "Unable to detect the %d Bit CRU Service.\n",
715 HPWDT_ARCH);
716 return retval;
717 }
718
719 /*
720 * We know this is the only CRU call we need to make so lets keep as
721 * few instructions as possible once the NMI comes in.
722 */
723 cmn_regs.u1.rah = 0x0D;
724 cmn_regs.u1.ral = 0x02;
725 }
dann frazier2ec7ed62010-07-28 12:38:43 -0600726
727 /*
Don Zickus09ee1012012-03-29 16:11:15 -0400728 * Only one function can register for NMI_UNKNOWN
dann frazier2ec7ed62010-07-28 12:38:43 -0600729 */
Don Zickus09ee1012012-03-29 16:11:15 -0400730 retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt");
Don Zickus553222f2012-03-29 16:11:16 -0400731 if (retval)
732 goto error;
733 retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt");
734 if (retval)
735 goto error1;
736 retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt");
737 if (retval)
738 goto error2;
dann frazier2ec7ed62010-07-28 12:38:43 -0600739
740 dev_info(&dev->dev,
741 "HP Watchdog Timer Driver: NMI decoding initialized"
Don Zickus09ee1012012-03-29 16:11:15 -0400742 ", allow kernel dump: %s (default = 0/OFF)\n",
743 (allow_kdump == 0) ? "OFF" : "ON");
dann frazier2ec7ed62010-07-28 12:38:43 -0600744 return 0;
Don Zickus553222f2012-03-29 16:11:16 -0400745
746error2:
747 unregister_nmi_handler(NMI_SERR, "hpwdt");
748error1:
749 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
750error:
751 dev_warn(&dev->dev,
752 "Unable to register a die notifier (err=%d).\n",
753 retval);
754 if (cru_rom_addr)
755 iounmap(cru_rom_addr);
756 return retval;
dann frazier2ec7ed62010-07-28 12:38:43 -0600757}
758
Axel Linb77b7082011-03-02 11:49:44 +0800759static void hpwdt_exit_nmi_decoding(void)
dann frazier2ec7ed62010-07-28 12:38:43 -0600760{
Don Zickus9c48f1c2011-09-30 15:06:21 -0400761 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
Mingarelli, Thomasa0893612012-06-26 10:27:00 +0200762 unregister_nmi_handler(NMI_SERR, "hpwdt");
763 unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
dann frazier2ec7ed62010-07-28 12:38:43 -0600764 if (cru_rom_addr)
765 iounmap(cru_rom_addr);
766}
dann frazier86ded1f2010-07-27 17:51:02 -0600767#else /* !CONFIG_HPWDT_NMI_DECODING */
Bill Pemberton2d991a12012-11-19 13:21:41 -0500768static void hpwdt_check_nmi_decoding(struct pci_dev *dev)
dann frazier86ded1f2010-07-27 17:51:02 -0600769{
770}
771
Bill Pemberton2d991a12012-11-19 13:21:41 -0500772static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
dann frazier86ded1f2010-07-27 17:51:02 -0600773{
774 return 0;
775}
776
Axel Linb77b7082011-03-02 11:49:44 +0800777static void hpwdt_exit_nmi_decoding(void)
dann frazier86ded1f2010-07-27 17:51:02 -0600778{
779}
780#endif /* CONFIG_HPWDT_NMI_DECODING */
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000781
Bill Pemberton2d991a12012-11-19 13:21:41 -0500782static int hpwdt_init_one(struct pci_dev *dev,
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000783 const struct pci_device_id *ent)
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000784{
785 int retval;
786
787 /*
dann frazier34572b22010-07-27 17:51:01 -0600788 * Check if we can do NMI decoding or not
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000789 */
dann frazier34572b22010-07-27 17:51:01 -0600790 hpwdt_check_nmi_decoding(dev);
Thomas Mingarelli47bece82009-06-04 19:50:45 +0000791
792 /*
dann frazier36e3ff42010-07-27 17:50:57 -0600793 * First let's find out if we are on an iLO2+ server. We will
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000794 * not run on a legacy ASM box.
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000795 * So we only support the G5 ProLiant servers and higher.
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000796 */
797 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
798 dev_warn(&dev->dev,
dann frazier36e3ff42010-07-27 17:50:57 -0600799 "This server does not have an iLO2+ ASIC.\n");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000800 return -ENODEV;
801 }
802
803 if (pci_enable_device(dev)) {
804 dev_warn(&dev->dev,
805 "Not possible to enable PCI Device: 0x%x:0x%x.\n",
806 ent->vendor, ent->device);
807 return -ENODEV;
808 }
809
810 pci_mem_addr = pci_iomap(dev, 1, 0x80);
811 if (!pci_mem_addr) {
812 dev_warn(&dev->dev,
dann frazier36e3ff42010-07-27 17:50:57 -0600813 "Unable to detect the iLO2+ server memory.\n");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000814 retval = -ENOMEM;
815 goto error_pci_iomap;
816 }
817 hpwdt_timer_reg = pci_mem_addr + 0x70;
818 hpwdt_timer_con = pci_mem_addr + 0x72;
819
Toshi Kani308b1352012-08-27 12:52:24 -0600820 /* Make sure that timer is disabled until /dev/watchdog is opened */
821 hpwdt_stop();
822
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000823 /* Make sure that we have a valid soft_margin */
824 if (hpwdt_change_timer(soft_margin))
825 hpwdt_change_timer(DEFAULT_MARGIN);
826
dann frazier2ec7ed62010-07-28 12:38:43 -0600827 /* Initialize NMI Decoding functionality */
828 retval = hpwdt_init_nmi_decoding(dev);
829 if (retval != 0)
830 goto error_init_nmi_decoding;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000831
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
dann frazier2ec7ed62010-07-28 12:38:43 -0600840 dev_info(&dev->dev, "HP Watchdog Timer Driver: %s"
841 ", timer margin: %d seconds (nowayout=%d).\n",
842 HPWDT_VERSION, soft_margin, nowayout);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000843 return 0;
844
845error_misc_register:
dann frazier2ec7ed62010-07-28 12:38:43 -0600846 hpwdt_exit_nmi_decoding();
847error_init_nmi_decoding:
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000848 pci_iounmap(dev, pci_mem_addr);
849error_pci_iomap:
850 pci_disable_device(dev);
851 return retval;
852}
853
Bill Pemberton4b12b892012-11-19 13:26:24 -0500854static void hpwdt_exit(struct pci_dev *dev)
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000855{
856 if (!nowayout)
857 hpwdt_stop();
858
859 misc_deregister(&hpwdt_miscdev);
dann frazier2ec7ed62010-07-28 12:38:43 -0600860 hpwdt_exit_nmi_decoding();
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000861 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,
Bill Pemberton82268712012-11-19 13:21:12 -0500869 .remove = hpwdt_exit,
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000870};
871
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000872MODULE_AUTHOR("Tom Mingarelli");
873MODULE_DESCRIPTION("hp watchdog driver");
874MODULE_LICENSE("GPL");
Thomas Mingarellid8100c32009-03-03 00:17:16 +0000875MODULE_VERSION(HPWDT_VERSION);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000876MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
877
878module_param(soft_margin, int, 0);
879MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
880
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +0100881module_param(nowayout, bool, 0);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000882MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
883 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
884
dann frazier86ded1f2010-07-27 17:51:02 -0600885#ifdef CONFIG_HPWDT_NMI_DECODING
dann frazier550d2992010-07-27 17:50:54 -0600886module_param(allow_kdump, int, 0);
887MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
dann frazier86ded1f2010-07-27 17:51:02 -0600888#endif /* !CONFIG_HPWDT_NMI_DECODING */
Tom Mingarelli44df7532009-06-18 23:28:57 +0000889
Wim Van Sebroeck5ce9c372012-05-04 14:43:25 +0200890module_pci_driver(hpwdt_driver);