Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 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 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 17 | |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 18 | #include <linux/device.h> |
| 19 | #include <linux/fs.h> |
| 20 | #include <linux/init.h> |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 21 | #include <linux/io.h> |
dann frazier | a52e6d1 | 2010-07-27 17:50:50 -0600 | [diff] [blame] | 22 | #include <linux/bitops.h> |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 23 | #include <linux/kernel.h> |
| 24 | #include <linux/miscdevice.h> |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 25 | #include <linux/module.h> |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 26 | #include <linux/moduleparam.h> |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 27 | #include <linux/pci.h> |
| 28 | #include <linux/pci_ids.h> |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 29 | #include <linux/types.h> |
| 30 | #include <linux/uaccess.h> |
| 31 | #include <linux/watchdog.h> |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 32 | #ifdef CONFIG_HPWDT_NMI_DECODING |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 33 | #include <linux/dmi.h> |
dann frazier | a52e6d1 | 2010-07-27 17:50:50 -0600 | [diff] [blame] | 34 | #include <linux/spinlock.h> |
dann frazier | 923410d | 2010-07-27 17:50:54 -0600 | [diff] [blame] | 35 | #include <linux/nmi.h> |
| 36 | #include <linux/kdebug.h> |
| 37 | #include <linux/notifier.h> |
Bernhard Walle | 0602641 | 2008-11-14 15:47:03 +0100 | [diff] [blame] | 38 | #include <asm/cacheflush.h> |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 39 | #endif /* CONFIG_HPWDT_NMI_DECODING */ |
Ingo Molnar | d48b0e1 | 2011-10-06 14:20:27 +0200 | [diff] [blame] | 40 | #include <asm/nmi.h> |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 41 | |
Mingarelli, Thomas | cce78da | 2013-07-09 23:04:55 +0000 | [diff] [blame] | 42 | #define HPWDT_VERSION "1.3.2" |
dann frazier | e802e32 | 2010-06-02 16:23:39 -0600 | [diff] [blame] | 43 | #define SECS_TO_TICKS(secs) ((secs) * 1000 / 128) |
dann frazier | 6f681c2 | 2010-06-02 16:23:40 -0600 | [diff] [blame] | 44 | #define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000) |
| 45 | #define HPWDT_MAX_TIMER TICKS_TO_SECS(65535) |
dann frazier | 923410d | 2010-07-27 17:50:54 -0600 | [diff] [blame] | 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 */ |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 50 | static bool nowayout = WATCHDOG_NOWAYOUT; |
dann frazier | 923410d | 2010-07-27 17:50:54 -0600 | [diff] [blame] | 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 | |
Wim Van Sebroeck | 4562f53 | 2011-02-21 12:16:44 +0000 | [diff] [blame] | 58 | static DEFINE_PCI_DEVICE_TABLE(hpwdt_devices) = { |
dann frazier | 36e3ff4 | 2010-07-27 17:50:57 -0600 | [diff] [blame] | 59 | { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */ |
| 60 | { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */ |
dann frazier | 923410d | 2010-07-27 17:50:54 -0600 | [diff] [blame] | 61 | {0}, /* terminate list */ |
| 62 | }; |
| 63 | MODULE_DEVICE_TABLE(pci, hpwdt_devices); |
| 64 | |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 65 | #ifdef CONFIG_HPWDT_NMI_DECODING |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 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 | |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 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 | |
Thomas Mingarelli | 5efc7a6 | 2011-07-26 14:05:53 +0100 | [diff] [blame] | 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 | |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 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 | |
dann frazier | 34572b2 | 2010-07-27 17:51:01 -0600 | [diff] [blame] | 148 | static unsigned int hpwdt_nmi_decoding; |
Mingarelli, Thomas | a089361 | 2012-06-26 10:27:00 +0200 | [diff] [blame] | 149 | static unsigned int allow_kdump = 1; |
Thomas Mingarelli | 5efc7a6 | 2011-07-26 14:05:53 +0100 | [diff] [blame] | 150 | static unsigned int is_icru; |
Mingarelli, Thomas | cce78da | 2013-07-09 23:04:55 +0000 | [diff] [blame] | 151 | static unsigned int is_uefi; |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 152 | static DEFINE_SPINLOCK(rom_lock); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 153 | static void *cru_rom_addr; |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 154 | static struct cmn_registers cmn_regs; |
| 155 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 156 | extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, |
| 157 | unsigned long *pRomEntry); |
Linus Torvalds | 1f6ef234 | 2008-06-20 12:19:28 -0700 | [diff] [blame] | 158 | |
dann frazier | 6b7f3d5 | 2010-07-27 17:50:59 -0600 | [diff] [blame] | 159 | #ifdef CONFIG_X86_32 |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 160 | /* --32 Bit Bios------------------------------------------------------------ */ |
| 161 | |
| 162 | #define HPWDT_ARCH 32 |
| 163 | |
Linus Torvalds | 1f6ef234 | 2008-06-20 12:19:28 -0700 | [diff] [blame] | 164 | asm(".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 Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 204 | |
| 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 Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 216 | static int cru_detect(unsigned long map_entry, |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 217 | 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 Uvarov | 97d2a10 | 2012-01-15 20:02:50 -0800 | [diff] [blame] | 236 | set_memory_x((unsigned long)bios32_map, 2); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 237 | asminline_call(&cmn_regs, bios32_entrypoint); |
| 238 | |
| 239 | if (cmn_regs.u1.ral != 0) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 240 | pr_warn("Call succeeded but with an error: 0x%x\n", |
Thomas Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 241 | cmn_regs.u1.ral); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 242 | } 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 Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 247 | physical_bios_base + physical_bios_offset; |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 248 | |
| 249 | /* If the values look OK, then map it in. */ |
| 250 | if ((physical_bios_base + physical_bios_offset)) { |
| 251 | cru_rom_addr = |
Thomas Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 252 | ioremap(cru_physical_address, cru_length); |
Mingarelli, Thomas | e67d668 | 2011-11-07 10:59:00 +0100 | [diff] [blame] | 253 | if (cru_rom_addr) { |
Maxim Uvarov | 97d2a10 | 2012-01-15 20:02:50 -0800 | [diff] [blame] | 254 | set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK, |
| 255 | (cru_length + PAGE_SIZE - 1) >> PAGE_SHIFT); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 256 | retval = 0; |
Mingarelli, Thomas | e67d668 | 2011-11-07 10:59:00 +0100 | [diff] [blame] | 257 | } |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 258 | } |
| 259 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 260 | 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 Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 264 | } |
| 265 | iounmap(bios32_map); |
| 266 | return retval; |
| 267 | } |
| 268 | |
| 269 | /* |
Roland Dreier | 30ec910 | 2008-02-28 12:34:42 -0800 | [diff] [blame] | 270 | * bios_checksum |
| 271 | */ |
Bill Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 272 | static int bios_checksum(const char __iomem *ptr, int len) |
Roland Dreier | 30ec910 | 2008-02-28 12:34:42 -0800 | [diff] [blame] | 273 | { |
| 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 Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 288 | * 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 Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 297 | static int bios32_present(const char __iomem *p) |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 298 | { |
| 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 Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 327 | static int detect_cru_service(void) |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 328 | { |
| 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 frazier | 6b7f3d5 | 2010-07-27 17:50:59 -0600 | [diff] [blame] | 347 | /* ------------------------------------------------------------------------- */ |
| 348 | #endif /* CONFIG_X86_32 */ |
| 349 | #ifdef CONFIG_X86_64 |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 350 | /* --64 Bit Bios------------------------------------------------------------ */ |
| 351 | |
| 352 | #define HPWDT_ARCH 64 |
| 353 | |
Linus Torvalds | 1f6ef234 | 2008-06-20 12:19:28 -0700 | [diff] [blame] | 354 | asm(".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 Torvalds | 1f6ef234 | 2008-06-20 12:19:28 -0700 | [diff] [blame] | 375 | "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 Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 391 | |
| 392 | /* |
| 393 | * dmi_find_cru |
| 394 | * |
| 395 | * Routine Description: |
Roland Dreier | 30ec910 | 2008-02-28 12:34:42 -0800 | [diff] [blame] | 396 | * This function checks whether or not a SMBIOS/DMI record is |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 397 | * the 64bit CRU info or not |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 398 | */ |
Bill Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 399 | static void dmi_find_cru(const struct dmi_header *dm, void *dummy) |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 400 | { |
| 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 Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 408 | smbios_cru64_ptr->physical_address + |
| 409 | smbios_cru64_ptr->double_offset; |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 410 | cru_rom_addr = ioremap(cru_physical_address, |
Thomas Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 411 | smbios_cru64_ptr->double_length); |
Bernhard Walle | 0602641 | 2008-11-14 15:47:03 +0100 | [diff] [blame] | 412 | set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK, |
| 413 | smbios_cru64_ptr->double_length >> PAGE_SHIFT); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 414 | } |
| 415 | } |
| 416 | } |
| 417 | |
Bill Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 418 | static int detect_cru_service(void) |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 419 | { |
| 420 | cru_rom_addr = NULL; |
| 421 | |
Jean Delvare | e7a19c56 | 2009-03-30 21:46:44 +0200 | [diff] [blame] | 422 | dmi_walk(dmi_find_cru, NULL); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 423 | |
| 424 | /* if cru_rom_addr has been set then we found a CRU service */ |
Thomas Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 425 | return ((cru_rom_addr != NULL) ? 0 : -ENODEV); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 426 | } |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 427 | /* ------------------------------------------------------------------------- */ |
dann frazier | 6b7f3d5 | 2010-07-27 17:50:59 -0600 | [diff] [blame] | 428 | #endif /* CONFIG_X86_64 */ |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 429 | #endif /* CONFIG_HPWDT_NMI_DECODING */ |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 430 | |
| 431 | /* |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 432 | * Watchdog operations |
| 433 | */ |
| 434 | static void hpwdt_start(void) |
| 435 | { |
dann frazier | e802e32 | 2010-06-02 16:23:39 -0600 | [diff] [blame] | 436 | reload = SECS_TO_TICKS(soft_margin); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 437 | iowrite16(reload, hpwdt_timer_reg); |
Mingarelli, Thomas | d08c9a3 | 2012-04-03 05:37:01 +0000 | [diff] [blame] | 438 | iowrite8(0x85, hpwdt_timer_con); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 439 | } |
| 440 | |
| 441 | static void hpwdt_stop(void) |
| 442 | { |
| 443 | unsigned long data; |
| 444 | |
Mingarelli, Thomas | d08c9a3 | 2012-04-03 05:37:01 +0000 | [diff] [blame] | 445 | data = ioread8(hpwdt_timer_con); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 446 | data &= 0xFE; |
Mingarelli, Thomas | d08c9a3 | 2012-04-03 05:37:01 +0000 | [diff] [blame] | 447 | iowrite8(data, hpwdt_timer_con); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | static void hpwdt_ping(void) |
| 451 | { |
| 452 | iowrite16(reload, hpwdt_timer_reg); |
| 453 | } |
| 454 | |
| 455 | static int hpwdt_change_timer(int new_margin) |
| 456 | { |
dann frazier | 6f681c2 | 2010-06-02 16:23:40 -0600 | [diff] [blame] | 457 | if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 458 | pr_warn("New value passed in is invalid: %d seconds\n", |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 459 | new_margin); |
| 460 | return -EINVAL; |
| 461 | } |
| 462 | |
| 463 | soft_margin = new_margin; |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 464 | pr_debug("New timer passed in is %d seconds\n", new_margin); |
dann frazier | e802e32 | 2010-06-02 16:23:39 -0600 | [diff] [blame] | 465 | reload = SECS_TO_TICKS(soft_margin); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 466 | |
| 467 | return 0; |
| 468 | } |
| 469 | |
dann frazier | aae67f3 | 2010-06-02 16:23:41 -0600 | [diff] [blame] | 470 | static int hpwdt_time_left(void) |
| 471 | { |
| 472 | return TICKS_TO_SECS(ioread16(hpwdt_timer_reg)); |
| 473 | } |
| 474 | |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 475 | #ifdef CONFIG_HPWDT_NMI_DECODING |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 476 | /* |
Thomas Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 477 | * NMI Handler |
| 478 | */ |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 479 | static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs) |
Thomas Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 480 | { |
| 481 | unsigned long rom_pl; |
| 482 | static int die_nmi_called; |
| 483 | |
dann frazier | 34572b2 | 2010-07-27 17:51:01 -0600 | [diff] [blame] | 484 | if (!hpwdt_nmi_decoding) |
dann frazier | 243066b | 2010-07-27 17:50:49 -0600 | [diff] [blame] | 485 | goto out; |
| 486 | |
| 487 | spin_lock_irqsave(&rom_lock, rom_pl); |
Mingarelli, Thomas | cce78da | 2013-07-09 23:04:55 +0000 | [diff] [blame] | 488 | if (!die_nmi_called && !is_icru && !is_uefi) |
dann frazier | 243066b | 2010-07-27 17:50:49 -0600 | [diff] [blame] | 489 | asminline_call(&cmn_regs, cru_rom_addr); |
| 490 | die_nmi_called = 1; |
| 491 | spin_unlock_irqrestore(&rom_lock, rom_pl); |
Thomas Mingarelli | 5efc7a6 | 2011-07-26 14:05:53 +0100 | [diff] [blame] | 492 | |
| 493 | if (allow_kdump) |
| 494 | hpwdt_stop(); |
Naga Chumbalkar | dbc018e | 2011-08-09 22:27:26 +0000 | [diff] [blame] | 495 | |
Mingarelli, Thomas | cce78da | 2013-07-09 23:04:55 +0000 | [diff] [blame] | 496 | if (!is_icru && !is_uefi) { |
Naga Chumbalkar | dbc018e | 2011-08-09 22:27:26 +0000 | [diff] [blame] | 497 | if (cmn_regs.u1.ral == 0) { |
| 498 | panic("An NMI occurred, " |
| 499 | "but unable to determine source.\n"); |
| 500 | } |
| 501 | } |
Thomas Mingarelli | 5efc7a6 | 2011-07-26 14:05:53 +0100 | [diff] [blame] | 502 | panic("An NMI occurred, please see the Integrated " |
| 503 | "Management Log for details.\n"); |
| 504 | |
dann frazier | 243066b | 2010-07-27 17:50:49 -0600 | [diff] [blame] | 505 | out: |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 506 | return NMI_DONE; |
Thomas Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 507 | } |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 508 | #endif /* CONFIG_HPWDT_NMI_DECODING */ |
Thomas Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 509 | |
| 510 | /* |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 511 | * /dev/watchdog handling |
| 512 | */ |
| 513 | static 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 | |
| 526 | static 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 Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 532 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 533 | 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 | |
| 544 | static 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 Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 559 | if (get_user(c, data + i)) |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 560 | 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 Sebroeck | 42747d7 | 2009-12-26 18:55:22 +0000 | [diff] [blame] | 573 | static const struct watchdog_info ident = { |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 574 | .options = WDIOF_SETTIMEOUT | |
| 575 | WDIOF_KEEPALIVEPING | |
| 576 | WDIOF_MAGICCLOSE, |
dann frazier | 36e3ff4 | 2010-07-27 17:50:57 -0600 | [diff] [blame] | 577 | .identity = "HP iLO2+ HW Watchdog Timer", |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 578 | }; |
| 579 | |
| 580 | static 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 frazier | aae67f3 | 2010-06-02 16:23:41 -0600 | [diff] [blame] | 619 | |
| 620 | case WDIOC_GETTIMELEFT: |
| 621 | ret = put_user(hpwdt_time_left(), p); |
| 622 | break; |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 623 | } |
| 624 | return ret; |
| 625 | } |
| 626 | |
| 627 | /* |
| 628 | * Kernel interfaces |
| 629 | */ |
Wim Van Sebroeck | d5c26a5 | 2009-03-18 08:18:43 +0000 | [diff] [blame] | 630 | static const struct file_operations hpwdt_fops = { |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 631 | .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 | |
| 639 | static struct miscdevice hpwdt_miscdev = { |
| 640 | .minor = WATCHDOG_MINOR, |
| 641 | .name = "watchdog", |
| 642 | .fops = &hpwdt_fops, |
| 643 | }; |
| 644 | |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 645 | /* |
| 646 | * Init & Exit |
| 647 | */ |
| 648 | |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 649 | #ifdef CONFIG_HPWDT_NMI_DECODING |
Don Zickus | 4a7863c | 2010-12-22 14:00:03 -0500 | [diff] [blame] | 650 | #ifdef CONFIG_X86_LOCAL_APIC |
Bill Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 651 | static void hpwdt_check_nmi_decoding(struct pci_dev *dev) |
Thomas Mingarelli | 47bece8 | 2009-06-04 19:50:45 +0000 | [diff] [blame] | 652 | { |
| 653 | /* |
| 654 | * If nmi_watchdog is turned off then we can turn on |
dann frazier | 34572b2 | 2010-07-27 17:51:01 -0600 | [diff] [blame] | 655 | * our nmi decoding capability. |
Thomas Mingarelli | 47bece8 | 2009-06-04 19:50:45 +0000 | [diff] [blame] | 656 | */ |
Don Zickus | 072b198 | 2010-11-12 11:22:24 -0500 | [diff] [blame] | 657 | hpwdt_nmi_decoding = 1; |
Thomas Mingarelli | 47bece8 | 2009-06-04 19:50:45 +0000 | [diff] [blame] | 658 | } |
| 659 | #else |
Bill Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 660 | static void hpwdt_check_nmi_decoding(struct pci_dev *dev) |
Thomas Mingarelli | 47bece8 | 2009-06-04 19:50:45 +0000 | [diff] [blame] | 661 | { |
dann frazier | 34572b2 | 2010-07-27 17:51:01 -0600 | [diff] [blame] | 662 | dev_warn(&dev->dev, "NMI decoding is disabled. " |
Thomas Mingarelli | 47bece8 | 2009-06-04 19:50:45 +0000 | [diff] [blame] | 663 | "Your kernel does not support a NMI Watchdog.\n"); |
| 664 | } |
Don Zickus | 4a7863c | 2010-12-22 14:00:03 -0500 | [diff] [blame] | 665 | #endif /* CONFIG_X86_LOCAL_APIC */ |
dann frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 666 | |
Thomas Mingarelli | 5efc7a6 | 2011-07-26 14:05:53 +0100 | [diff] [blame] | 667 | /* |
| 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 Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 675 | static void dmi_find_icru(const struct dmi_header *dm, void *dummy) |
Thomas Mingarelli | 5efc7a6 | 2011-07-26 14:05:53 +0100 | [diff] [blame] | 676 | { |
| 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, Thomas | cce78da | 2013-07-09 23:04:55 +0000 | [diff] [blame] | 683 | if (smbios_proliant_ptr->misc_features & 0x408) |
| 684 | is_uefi = 1; |
Thomas Mingarelli | 5efc7a6 | 2011-07-26 14:05:53 +0100 | [diff] [blame] | 685 | } |
| 686 | } |
| 687 | |
Bill Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 688 | static int hpwdt_init_nmi_decoding(struct pci_dev *dev) |
dann frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 689 | { |
| 690 | int retval; |
| 691 | |
| 692 | /* |
Thomas Mingarelli | 5efc7a6 | 2011-07-26 14:05:53 +0100 | [diff] [blame] | 693 | * 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 frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 701 | */ |
Thomas Mingarelli | 5efc7a6 | 2011-07-26 14:05:53 +0100 | [diff] [blame] | 702 | dmi_walk(dmi_find_icru, NULL); |
Mingarelli, Thomas | cce78da | 2013-07-09 23:04:55 +0000 | [diff] [blame] | 703 | if (!is_icru && !is_uefi) { |
dann frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 704 | |
Thomas Mingarelli | 5efc7a6 | 2011-07-26 14:05:53 +0100 | [diff] [blame] | 705 | /* |
| 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 frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 726 | |
| 727 | /* |
Don Zickus | 09ee101 | 2012-03-29 16:11:15 -0400 | [diff] [blame] | 728 | * Only one function can register for NMI_UNKNOWN |
dann frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 729 | */ |
Don Zickus | 09ee101 | 2012-03-29 16:11:15 -0400 | [diff] [blame] | 730 | retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt"); |
Don Zickus | 553222f | 2012-03-29 16:11:16 -0400 | [diff] [blame] | 731 | 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 frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 739 | |
| 740 | dev_info(&dev->dev, |
| 741 | "HP Watchdog Timer Driver: NMI decoding initialized" |
Don Zickus | 09ee101 | 2012-03-29 16:11:15 -0400 | [diff] [blame] | 742 | ", allow kernel dump: %s (default = 0/OFF)\n", |
| 743 | (allow_kdump == 0) ? "OFF" : "ON"); |
dann frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 744 | return 0; |
Don Zickus | 553222f | 2012-03-29 16:11:16 -0400 | [diff] [blame] | 745 | |
| 746 | error2: |
| 747 | unregister_nmi_handler(NMI_SERR, "hpwdt"); |
| 748 | error1: |
| 749 | unregister_nmi_handler(NMI_UNKNOWN, "hpwdt"); |
| 750 | error: |
| 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 frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 757 | } |
| 758 | |
Axel Lin | b77b708 | 2011-03-02 11:49:44 +0800 | [diff] [blame] | 759 | static void hpwdt_exit_nmi_decoding(void) |
dann frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 760 | { |
Don Zickus | 9c48f1c | 2011-09-30 15:06:21 -0400 | [diff] [blame] | 761 | unregister_nmi_handler(NMI_UNKNOWN, "hpwdt"); |
Mingarelli, Thomas | a089361 | 2012-06-26 10:27:00 +0200 | [diff] [blame] | 762 | unregister_nmi_handler(NMI_SERR, "hpwdt"); |
| 763 | unregister_nmi_handler(NMI_IO_CHECK, "hpwdt"); |
dann frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 764 | if (cru_rom_addr) |
| 765 | iounmap(cru_rom_addr); |
| 766 | } |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 767 | #else /* !CONFIG_HPWDT_NMI_DECODING */ |
Bill Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 768 | static void hpwdt_check_nmi_decoding(struct pci_dev *dev) |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 769 | { |
| 770 | } |
| 771 | |
Bill Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 772 | static int hpwdt_init_nmi_decoding(struct pci_dev *dev) |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 773 | { |
| 774 | return 0; |
| 775 | } |
| 776 | |
Axel Lin | b77b708 | 2011-03-02 11:49:44 +0800 | [diff] [blame] | 777 | static void hpwdt_exit_nmi_decoding(void) |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 778 | { |
| 779 | } |
| 780 | #endif /* CONFIG_HPWDT_NMI_DECODING */ |
Thomas Mingarelli | 47bece8 | 2009-06-04 19:50:45 +0000 | [diff] [blame] | 781 | |
Bill Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 782 | static int hpwdt_init_one(struct pci_dev *dev, |
Thomas Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 783 | const struct pci_device_id *ent) |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 784 | { |
| 785 | int retval; |
| 786 | |
| 787 | /* |
dann frazier | 34572b2 | 2010-07-27 17:51:01 -0600 | [diff] [blame] | 788 | * Check if we can do NMI decoding or not |
Thomas Mingarelli | 47bece8 | 2009-06-04 19:50:45 +0000 | [diff] [blame] | 789 | */ |
dann frazier | 34572b2 | 2010-07-27 17:51:01 -0600 | [diff] [blame] | 790 | hpwdt_check_nmi_decoding(dev); |
Thomas Mingarelli | 47bece8 | 2009-06-04 19:50:45 +0000 | [diff] [blame] | 791 | |
| 792 | /* |
dann frazier | 36e3ff4 | 2010-07-27 17:50:57 -0600 | [diff] [blame] | 793 | * First let's find out if we are on an iLO2+ server. We will |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 794 | * not run on a legacy ASM box. |
Thomas Mingarelli | ab4ba3c | 2008-07-15 19:40:41 +0000 | [diff] [blame] | 795 | * So we only support the G5 ProLiant servers and higher. |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 796 | */ |
| 797 | if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) { |
| 798 | dev_warn(&dev->dev, |
dann frazier | 36e3ff4 | 2010-07-27 17:50:57 -0600 | [diff] [blame] | 799 | "This server does not have an iLO2+ ASIC.\n"); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 800 | 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 frazier | 36e3ff4 | 2010-07-27 17:50:57 -0600 | [diff] [blame] | 813 | "Unable to detect the iLO2+ server memory.\n"); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 814 | 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 Kani | 308b135 | 2012-08-27 12:52:24 -0600 | [diff] [blame] | 820 | /* Make sure that timer is disabled until /dev/watchdog is opened */ |
| 821 | hpwdt_stop(); |
| 822 | |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 823 | /* Make sure that we have a valid soft_margin */ |
| 824 | if (hpwdt_change_timer(soft_margin)) |
| 825 | hpwdt_change_timer(DEFAULT_MARGIN); |
| 826 | |
dann frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 827 | /* Initialize NMI Decoding functionality */ |
| 828 | retval = hpwdt_init_nmi_decoding(dev); |
| 829 | if (retval != 0) |
| 830 | goto error_init_nmi_decoding; |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 831 | |
| 832 | retval = misc_register(&hpwdt_miscdev); |
| 833 | if (retval < 0) { |
| 834 | dev_warn(&dev->dev, |
| 835 | "Unable to register miscdev on minor=%d (err=%d).\n", |
| 836 | WATCHDOG_MINOR, retval); |
| 837 | goto error_misc_register; |
| 838 | } |
| 839 | |
dann frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 840 | dev_info(&dev->dev, "HP Watchdog Timer Driver: %s" |
| 841 | ", timer margin: %d seconds (nowayout=%d).\n", |
| 842 | HPWDT_VERSION, soft_margin, nowayout); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 843 | return 0; |
| 844 | |
| 845 | error_misc_register: |
dann frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 846 | hpwdt_exit_nmi_decoding(); |
| 847 | error_init_nmi_decoding: |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 848 | pci_iounmap(dev, pci_mem_addr); |
| 849 | error_pci_iomap: |
| 850 | pci_disable_device(dev); |
| 851 | return retval; |
| 852 | } |
| 853 | |
Bill Pemberton | 4b12b89 | 2012-11-19 13:26:24 -0500 | [diff] [blame] | 854 | static void hpwdt_exit(struct pci_dev *dev) |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 855 | { |
| 856 | if (!nowayout) |
| 857 | hpwdt_stop(); |
| 858 | |
| 859 | misc_deregister(&hpwdt_miscdev); |
dann frazier | 2ec7ed6 | 2010-07-28 12:38:43 -0600 | [diff] [blame] | 860 | hpwdt_exit_nmi_decoding(); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 861 | pci_iounmap(dev, pci_mem_addr); |
| 862 | pci_disable_device(dev); |
| 863 | } |
| 864 | |
| 865 | static struct pci_driver hpwdt_driver = { |
| 866 | .name = "hpwdt", |
| 867 | .id_table = hpwdt_devices, |
| 868 | .probe = hpwdt_init_one, |
Bill Pemberton | 8226871 | 2012-11-19 13:21:12 -0500 | [diff] [blame] | 869 | .remove = hpwdt_exit, |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 870 | }; |
| 871 | |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 872 | MODULE_AUTHOR("Tom Mingarelli"); |
| 873 | MODULE_DESCRIPTION("hp watchdog driver"); |
| 874 | MODULE_LICENSE("GPL"); |
Thomas Mingarelli | d8100c3 | 2009-03-03 00:17:16 +0000 | [diff] [blame] | 875 | MODULE_VERSION(HPWDT_VERSION); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 876 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
| 877 | |
| 878 | module_param(soft_margin, int, 0); |
| 879 | MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds"); |
| 880 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 881 | module_param(nowayout, bool, 0); |
Thomas Mingarelli | 7f4da47 | 2007-12-04 17:41:54 +0000 | [diff] [blame] | 882 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
| 883 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
| 884 | |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 885 | #ifdef CONFIG_HPWDT_NMI_DECODING |
dann frazier | 550d299 | 2010-07-27 17:50:54 -0600 | [diff] [blame] | 886 | module_param(allow_kdump, int, 0); |
| 887 | MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs"); |
dann frazier | 86ded1f | 2010-07-27 17:51:02 -0600 | [diff] [blame] | 888 | #endif /* !CONFIG_HPWDT_NMI_DECODING */ |
Tom Mingarelli | 44df753 | 2009-06-18 23:28:57 +0000 | [diff] [blame] | 889 | |
Wim Van Sebroeck | 5ce9c37 | 2012-05-04 14:43:25 +0200 | [diff] [blame] | 890 | module_pci_driver(hpwdt_driver); |