Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 1 | /* |
| 2 | * APEI Generic Hardware Error Source support |
| 3 | * |
| 4 | * Generic Hardware Error Source provides a way to report platform |
| 5 | * hardware errors (such as that from chipset). It works in so called |
| 6 | * "Firmware First" mode, that is, hardware errors are reported to |
| 7 | * firmware firstly, then reported to Linux by firmware. This way, |
| 8 | * some non-standard hardware error registers or non-standard hardware |
| 9 | * link can be checked by firmware to produce more hardware error |
| 10 | * information for Linux. |
| 11 | * |
| 12 | * For more information about Generic Hardware Error Source, please |
| 13 | * refer to ACPI Specification version 4.0, section 17.3.2.6 |
| 14 | * |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 15 | * Copyright 2010 Intel Corp. |
| 16 | * Author: Huang Ying <ying.huang@intel.com> |
| 17 | * |
| 18 | * This program is free software; you can redistribute it and/or |
| 19 | * modify it under the terms of the GNU General Public License version |
| 20 | * 2 as published by the Free Software Foundation; |
| 21 | * |
| 22 | * This program is distributed in the hope that it will be useful, |
| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 25 | * GNU General Public License for more details. |
| 26 | * |
| 27 | * You should have received a copy of the GNU General Public License |
| 28 | * along with this program; if not, write to the Free Software |
| 29 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 30 | */ |
| 31 | |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/module.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/acpi.h> |
| 36 | #include <linux/io.h> |
| 37 | #include <linux/interrupt.h> |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 38 | #include <linux/timer.h> |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 39 | #include <linux/cper.h> |
| 40 | #include <linux/kdebug.h> |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 41 | #include <linux/platform_device.h> |
| 42 | #include <linux/mutex.h> |
Huang Ying | 32c361f | 2010-12-07 10:22:31 +0800 | [diff] [blame] | 43 | #include <linux/ratelimit.h> |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 44 | #include <linux/vmalloc.h> |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 45 | #include <acpi/apei.h> |
| 46 | #include <acpi/atomicio.h> |
| 47 | #include <acpi/hed.h> |
| 48 | #include <asm/mce.h> |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 49 | #include <asm/tlbflush.h> |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 50 | |
| 51 | #include "apei-internal.h" |
| 52 | |
| 53 | #define GHES_PFX "GHES: " |
| 54 | |
| 55 | #define GHES_ESTATUS_MAX_SIZE 65536 |
| 56 | |
| 57 | /* |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 58 | * One struct ghes is created for each generic hardware error source. |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 59 | * It provides the context for APEI hardware error timer/IRQ/SCI/NMI |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 60 | * handler. |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 61 | * |
| 62 | * estatus: memory buffer for error status block, allocated during |
| 63 | * HEST parsing. |
| 64 | */ |
| 65 | #define GHES_TO_CLEAR 0x0001 |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 66 | #define GHES_EXITING 0x0002 |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 67 | |
| 68 | struct ghes { |
| 69 | struct acpi_hest_generic *generic; |
| 70 | struct acpi_hest_generic_status *estatus; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 71 | u64 buffer_paddr; |
| 72 | unsigned long flags; |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 73 | union { |
| 74 | struct list_head list; |
| 75 | struct timer_list timer; |
| 76 | unsigned int irq; |
| 77 | }; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 78 | }; |
| 79 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 80 | static int ghes_panic_timeout __read_mostly = 30; |
| 81 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 82 | /* |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 83 | * All error sources notified with SCI shares one notifier function, |
| 84 | * so they need to be linked and checked one by one. This is applied |
| 85 | * to NMI too. |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 86 | * |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 87 | * RCU is used for these lists, so ghes_list_mutex is only used for |
| 88 | * list changing, not for traversing. |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 89 | */ |
| 90 | static LIST_HEAD(ghes_sci); |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 91 | static LIST_HEAD(ghes_nmi); |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 92 | static DEFINE_MUTEX(ghes_list_mutex); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 93 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 94 | /* |
| 95 | * NMI may be triggered on any CPU, so ghes_nmi_lock is used for |
| 96 | * mutual exclusion. |
| 97 | */ |
| 98 | static DEFINE_RAW_SPINLOCK(ghes_nmi_lock); |
| 99 | |
| 100 | /* |
| 101 | * Because the memory area used to transfer hardware error information |
| 102 | * from BIOS to Linux can be determined only in NMI, IRQ or timer |
| 103 | * handler, but general ioremap can not be used in atomic context, so |
| 104 | * a special version of atomic ioremap is implemented for that. |
| 105 | */ |
| 106 | |
| 107 | /* |
| 108 | * Two virtual pages are used, one for NMI context, the other for |
| 109 | * IRQ/PROCESS context |
| 110 | */ |
| 111 | #define GHES_IOREMAP_PAGES 2 |
| 112 | #define GHES_IOREMAP_NMI_PAGE(base) (base) |
| 113 | #define GHES_IOREMAP_IRQ_PAGE(base) ((base) + PAGE_SIZE) |
| 114 | |
| 115 | /* virtual memory area for atomic ioremap */ |
| 116 | static struct vm_struct *ghes_ioremap_area; |
| 117 | /* |
| 118 | * These 2 spinlock is used to prevent atomic ioremap virtual memory |
| 119 | * area from being mapped simultaneously. |
| 120 | */ |
| 121 | static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi); |
| 122 | static DEFINE_SPINLOCK(ghes_ioremap_lock_irq); |
| 123 | |
| 124 | static int ghes_ioremap_init(void) |
| 125 | { |
| 126 | ghes_ioremap_area = __get_vm_area(PAGE_SIZE * GHES_IOREMAP_PAGES, |
| 127 | VM_IOREMAP, VMALLOC_START, VMALLOC_END); |
| 128 | if (!ghes_ioremap_area) { |
| 129 | pr_err(GHES_PFX "Failed to allocate virtual memory area for atomic ioremap.\n"); |
| 130 | return -ENOMEM; |
| 131 | } |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | static void ghes_ioremap_exit(void) |
| 137 | { |
| 138 | free_vm_area(ghes_ioremap_area); |
| 139 | } |
| 140 | |
| 141 | static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn) |
| 142 | { |
| 143 | unsigned long vaddr; |
| 144 | |
| 145 | vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr); |
| 146 | ioremap_page_range(vaddr, vaddr + PAGE_SIZE, |
| 147 | pfn << PAGE_SHIFT, PAGE_KERNEL); |
| 148 | |
| 149 | return (void __iomem *)vaddr; |
| 150 | } |
| 151 | |
| 152 | static void __iomem *ghes_ioremap_pfn_irq(u64 pfn) |
| 153 | { |
| 154 | unsigned long vaddr; |
| 155 | |
| 156 | vaddr = (unsigned long)GHES_IOREMAP_IRQ_PAGE(ghes_ioremap_area->addr); |
| 157 | ioremap_page_range(vaddr, vaddr + PAGE_SIZE, |
| 158 | pfn << PAGE_SHIFT, PAGE_KERNEL); |
| 159 | |
| 160 | return (void __iomem *)vaddr; |
| 161 | } |
| 162 | |
| 163 | static void ghes_iounmap_nmi(void __iomem *vaddr_ptr) |
| 164 | { |
| 165 | unsigned long vaddr = (unsigned long __force)vaddr_ptr; |
| 166 | void *base = ghes_ioremap_area->addr; |
| 167 | |
| 168 | BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_NMI_PAGE(base)); |
| 169 | unmap_kernel_range_noflush(vaddr, PAGE_SIZE); |
| 170 | __flush_tlb_one(vaddr); |
| 171 | } |
| 172 | |
| 173 | static void ghes_iounmap_irq(void __iomem *vaddr_ptr) |
| 174 | { |
| 175 | unsigned long vaddr = (unsigned long __force)vaddr_ptr; |
| 176 | void *base = ghes_ioremap_area->addr; |
| 177 | |
| 178 | BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_IRQ_PAGE(base)); |
| 179 | unmap_kernel_range_noflush(vaddr, PAGE_SIZE); |
| 180 | __flush_tlb_one(vaddr); |
| 181 | } |
| 182 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 183 | static struct ghes *ghes_new(struct acpi_hest_generic *generic) |
| 184 | { |
| 185 | struct ghes *ghes; |
| 186 | unsigned int error_block_length; |
| 187 | int rc; |
| 188 | |
| 189 | ghes = kzalloc(sizeof(*ghes), GFP_KERNEL); |
| 190 | if (!ghes) |
| 191 | return ERR_PTR(-ENOMEM); |
| 192 | ghes->generic = generic; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 193 | rc = acpi_pre_map_gar(&generic->error_status_address); |
| 194 | if (rc) |
| 195 | goto err_free; |
| 196 | error_block_length = generic->error_block_length; |
| 197 | if (error_block_length > GHES_ESTATUS_MAX_SIZE) { |
| 198 | pr_warning(FW_WARN GHES_PFX |
| 199 | "Error status block length is too long: %u for " |
| 200 | "generic hardware error source: %d.\n", |
| 201 | error_block_length, generic->header.source_id); |
| 202 | error_block_length = GHES_ESTATUS_MAX_SIZE; |
| 203 | } |
| 204 | ghes->estatus = kmalloc(error_block_length, GFP_KERNEL); |
| 205 | if (!ghes->estatus) { |
| 206 | rc = -ENOMEM; |
| 207 | goto err_unmap; |
| 208 | } |
| 209 | |
| 210 | return ghes; |
| 211 | |
| 212 | err_unmap: |
| 213 | acpi_post_unmap_gar(&generic->error_status_address); |
| 214 | err_free: |
| 215 | kfree(ghes); |
| 216 | return ERR_PTR(rc); |
| 217 | } |
| 218 | |
| 219 | static void ghes_fini(struct ghes *ghes) |
| 220 | { |
| 221 | kfree(ghes->estatus); |
| 222 | acpi_post_unmap_gar(&ghes->generic->error_status_address); |
| 223 | } |
| 224 | |
| 225 | enum { |
Huang Ying | ad4ecef | 2010-08-02 15:48:23 +0800 | [diff] [blame] | 226 | GHES_SEV_NO = 0x0, |
| 227 | GHES_SEV_CORRECTED = 0x1, |
| 228 | GHES_SEV_RECOVERABLE = 0x2, |
| 229 | GHES_SEV_PANIC = 0x3, |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 230 | }; |
| 231 | |
| 232 | static inline int ghes_severity(int severity) |
| 233 | { |
| 234 | switch (severity) { |
Huang Ying | ad4ecef | 2010-08-02 15:48:23 +0800 | [diff] [blame] | 235 | case CPER_SEV_INFORMATIONAL: |
| 236 | return GHES_SEV_NO; |
| 237 | case CPER_SEV_CORRECTED: |
| 238 | return GHES_SEV_CORRECTED; |
| 239 | case CPER_SEV_RECOVERABLE: |
| 240 | return GHES_SEV_RECOVERABLE; |
| 241 | case CPER_SEV_FATAL: |
| 242 | return GHES_SEV_PANIC; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 243 | default: |
| 244 | /* Unkown, go panic */ |
Huang Ying | ad4ecef | 2010-08-02 15:48:23 +0800 | [diff] [blame] | 245 | return GHES_SEV_PANIC; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 246 | } |
| 247 | } |
| 248 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 249 | static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len, |
| 250 | int from_phys) |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 251 | { |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 252 | void __iomem *vaddr; |
| 253 | unsigned long flags = 0; |
| 254 | int in_nmi = in_nmi(); |
| 255 | u64 offset; |
| 256 | u32 trunk; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 257 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 258 | while (len > 0) { |
| 259 | offset = paddr - (paddr & PAGE_MASK); |
| 260 | if (in_nmi) { |
| 261 | raw_spin_lock(&ghes_ioremap_lock_nmi); |
| 262 | vaddr = ghes_ioremap_pfn_nmi(paddr >> PAGE_SHIFT); |
| 263 | } else { |
| 264 | spin_lock_irqsave(&ghes_ioremap_lock_irq, flags); |
| 265 | vaddr = ghes_ioremap_pfn_irq(paddr >> PAGE_SHIFT); |
| 266 | } |
| 267 | trunk = PAGE_SIZE - offset; |
| 268 | trunk = min(trunk, len); |
| 269 | if (from_phys) |
| 270 | memcpy_fromio(buffer, vaddr + offset, trunk); |
| 271 | else |
| 272 | memcpy_toio(vaddr + offset, buffer, trunk); |
| 273 | len -= trunk; |
| 274 | paddr += trunk; |
| 275 | buffer += trunk; |
| 276 | if (in_nmi) { |
| 277 | ghes_iounmap_nmi(vaddr); |
| 278 | raw_spin_unlock(&ghes_ioremap_lock_nmi); |
| 279 | } else { |
| 280 | ghes_iounmap_irq(vaddr); |
| 281 | spin_unlock_irqrestore(&ghes_ioremap_lock_irq, flags); |
| 282 | } |
| 283 | } |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 284 | } |
| 285 | |
| 286 | static int ghes_read_estatus(struct ghes *ghes, int silent) |
| 287 | { |
| 288 | struct acpi_hest_generic *g = ghes->generic; |
| 289 | u64 buf_paddr; |
| 290 | u32 len; |
| 291 | int rc; |
| 292 | |
| 293 | rc = acpi_atomic_read(&buf_paddr, &g->error_status_address); |
| 294 | if (rc) { |
| 295 | if (!silent && printk_ratelimit()) |
| 296 | pr_warning(FW_WARN GHES_PFX |
| 297 | "Failed to read error status block address for hardware error source: %d.\n", |
| 298 | g->header.source_id); |
| 299 | return -EIO; |
| 300 | } |
| 301 | if (!buf_paddr) |
| 302 | return -ENOENT; |
| 303 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 304 | ghes_copy_tofrom_phys(ghes->estatus, buf_paddr, |
| 305 | sizeof(*ghes->estatus), 1); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 306 | if (!ghes->estatus->block_status) |
| 307 | return -ENOENT; |
| 308 | |
| 309 | ghes->buffer_paddr = buf_paddr; |
| 310 | ghes->flags |= GHES_TO_CLEAR; |
| 311 | |
| 312 | rc = -EIO; |
| 313 | len = apei_estatus_len(ghes->estatus); |
| 314 | if (len < sizeof(*ghes->estatus)) |
| 315 | goto err_read_block; |
| 316 | if (len > ghes->generic->error_block_length) |
| 317 | goto err_read_block; |
| 318 | if (apei_estatus_check_header(ghes->estatus)) |
| 319 | goto err_read_block; |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 320 | ghes_copy_tofrom_phys(ghes->estatus + 1, |
| 321 | buf_paddr + sizeof(*ghes->estatus), |
| 322 | len - sizeof(*ghes->estatus), 1); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 323 | if (apei_estatus_check(ghes->estatus)) |
| 324 | goto err_read_block; |
| 325 | rc = 0; |
| 326 | |
| 327 | err_read_block: |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 328 | if (rc && !silent && printk_ratelimit()) |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 329 | pr_warning(FW_WARN GHES_PFX |
| 330 | "Failed to read error status block!\n"); |
| 331 | return rc; |
| 332 | } |
| 333 | |
| 334 | static void ghes_clear_estatus(struct ghes *ghes) |
| 335 | { |
| 336 | ghes->estatus->block_status = 0; |
| 337 | if (!(ghes->flags & GHES_TO_CLEAR)) |
| 338 | return; |
| 339 | ghes_copy_tofrom_phys(ghes->estatus, ghes->buffer_paddr, |
| 340 | sizeof(ghes->estatus->block_status), 0); |
| 341 | ghes->flags &= ~GHES_TO_CLEAR; |
| 342 | } |
| 343 | |
| 344 | static void ghes_do_proc(struct ghes *ghes) |
| 345 | { |
Huang Ying | ad4ecef | 2010-08-02 15:48:23 +0800 | [diff] [blame] | 346 | int sev, processed = 0; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 347 | struct acpi_hest_generic_data *gdata; |
| 348 | |
Huang Ying | ad4ecef | 2010-08-02 15:48:23 +0800 | [diff] [blame] | 349 | sev = ghes_severity(ghes->estatus->error_severity); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 350 | apei_estatus_for_each_section(ghes->estatus, gdata) { |
| 351 | #ifdef CONFIG_X86_MCE |
| 352 | if (!uuid_le_cmp(*(uuid_le *)gdata->section_type, |
| 353 | CPER_SEC_PLATFORM_MEM)) { |
| 354 | apei_mce_report_mem_error( |
Huang Ying | ad4ecef | 2010-08-02 15:48:23 +0800 | [diff] [blame] | 355 | sev == GHES_SEV_CORRECTED, |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 356 | (struct cper_sec_mem_err *)(gdata+1)); |
| 357 | processed = 1; |
| 358 | } |
| 359 | #endif |
| 360 | } |
Huang Ying | 32c361f | 2010-12-07 10:22:31 +0800 | [diff] [blame] | 361 | } |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 362 | |
Huang Ying | 32c361f | 2010-12-07 10:22:31 +0800 | [diff] [blame] | 363 | static void ghes_print_estatus(const char *pfx, struct ghes *ghes) |
| 364 | { |
| 365 | /* Not more than 2 messages every 5 seconds */ |
| 366 | static DEFINE_RATELIMIT_STATE(ratelimit, 5*HZ, 2); |
| 367 | |
| 368 | if (pfx == NULL) { |
| 369 | if (ghes_severity(ghes->estatus->error_severity) <= |
| 370 | GHES_SEV_CORRECTED) |
| 371 | pfx = KERN_WARNING HW_ERR; |
| 372 | else |
| 373 | pfx = KERN_ERR HW_ERR; |
| 374 | } |
| 375 | if (__ratelimit(&ratelimit)) { |
| 376 | printk( |
| 377 | "%s""Hardware error from APEI Generic Hardware Error Source: %d\n", |
| 378 | pfx, ghes->generic->header.source_id); |
| 379 | apei_estatus_print(pfx, ghes->estatus); |
| 380 | } |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 381 | } |
| 382 | |
| 383 | static int ghes_proc(struct ghes *ghes) |
| 384 | { |
| 385 | int rc; |
| 386 | |
| 387 | rc = ghes_read_estatus(ghes, 0); |
| 388 | if (rc) |
| 389 | goto out; |
Huang Ying | 32c361f | 2010-12-07 10:22:31 +0800 | [diff] [blame] | 390 | ghes_print_estatus(NULL, ghes); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 391 | ghes_do_proc(ghes); |
| 392 | |
| 393 | out: |
| 394 | ghes_clear_estatus(ghes); |
| 395 | return 0; |
| 396 | } |
| 397 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 398 | static void ghes_add_timer(struct ghes *ghes) |
| 399 | { |
| 400 | struct acpi_hest_generic *g = ghes->generic; |
| 401 | unsigned long expire; |
| 402 | |
| 403 | if (!g->notify.poll_interval) { |
| 404 | pr_warning(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n", |
| 405 | g->header.source_id); |
| 406 | return; |
| 407 | } |
| 408 | expire = jiffies + msecs_to_jiffies(g->notify.poll_interval); |
| 409 | ghes->timer.expires = round_jiffies_relative(expire); |
| 410 | add_timer(&ghes->timer); |
| 411 | } |
| 412 | |
| 413 | static void ghes_poll_func(unsigned long data) |
| 414 | { |
| 415 | struct ghes *ghes = (void *)data; |
| 416 | |
| 417 | ghes_proc(ghes); |
| 418 | if (!(ghes->flags & GHES_EXITING)) |
| 419 | ghes_add_timer(ghes); |
| 420 | } |
| 421 | |
| 422 | static irqreturn_t ghes_irq_func(int irq, void *data) |
| 423 | { |
| 424 | struct ghes *ghes = data; |
| 425 | int rc; |
| 426 | |
| 427 | rc = ghes_proc(ghes); |
| 428 | if (rc) |
| 429 | return IRQ_NONE; |
| 430 | |
| 431 | return IRQ_HANDLED; |
| 432 | } |
| 433 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 434 | static int ghes_notify_sci(struct notifier_block *this, |
| 435 | unsigned long event, void *data) |
| 436 | { |
| 437 | struct ghes *ghes; |
| 438 | int ret = NOTIFY_DONE; |
| 439 | |
| 440 | rcu_read_lock(); |
| 441 | list_for_each_entry_rcu(ghes, &ghes_sci, list) { |
| 442 | if (!ghes_proc(ghes)) |
| 443 | ret = NOTIFY_OK; |
| 444 | } |
| 445 | rcu_read_unlock(); |
| 446 | |
| 447 | return ret; |
| 448 | } |
| 449 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 450 | static int ghes_notify_nmi(struct notifier_block *this, |
| 451 | unsigned long cmd, void *data) |
| 452 | { |
| 453 | struct ghes *ghes, *ghes_global = NULL; |
| 454 | int sev, sev_global = -1; |
| 455 | int ret = NOTIFY_DONE; |
| 456 | |
| 457 | if (cmd != DIE_NMI) |
| 458 | return ret; |
| 459 | |
| 460 | raw_spin_lock(&ghes_nmi_lock); |
| 461 | list_for_each_entry_rcu(ghes, &ghes_nmi, list) { |
| 462 | if (ghes_read_estatus(ghes, 1)) { |
| 463 | ghes_clear_estatus(ghes); |
| 464 | continue; |
| 465 | } |
| 466 | sev = ghes_severity(ghes->estatus->error_severity); |
| 467 | if (sev > sev_global) { |
| 468 | sev_global = sev; |
| 469 | ghes_global = ghes; |
| 470 | } |
| 471 | ret = NOTIFY_STOP; |
| 472 | } |
| 473 | |
| 474 | if (ret == NOTIFY_DONE) |
| 475 | goto out; |
| 476 | |
| 477 | if (sev_global >= GHES_SEV_PANIC) { |
| 478 | oops_begin(); |
| 479 | ghes_print_estatus(KERN_EMERG HW_ERR, ghes_global); |
| 480 | /* reboot to log the error! */ |
| 481 | if (panic_timeout == 0) |
| 482 | panic_timeout = ghes_panic_timeout; |
| 483 | panic("Fatal hardware error!"); |
| 484 | } |
| 485 | |
| 486 | list_for_each_entry_rcu(ghes, &ghes_nmi, list) { |
| 487 | if (!(ghes->flags & GHES_TO_CLEAR)) |
| 488 | continue; |
| 489 | /* Do not print estatus because printk is not NMI safe */ |
| 490 | ghes_do_proc(ghes); |
| 491 | ghes_clear_estatus(ghes); |
| 492 | } |
| 493 | |
| 494 | out: |
| 495 | raw_spin_unlock(&ghes_nmi_lock); |
| 496 | return ret; |
| 497 | } |
| 498 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 499 | static struct notifier_block ghes_notifier_sci = { |
| 500 | .notifier_call = ghes_notify_sci, |
| 501 | }; |
| 502 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 503 | static struct notifier_block ghes_notifier_nmi = { |
| 504 | .notifier_call = ghes_notify_nmi, |
| 505 | }; |
| 506 | |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 507 | static int __devinit ghes_probe(struct platform_device *ghes_dev) |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 508 | { |
| 509 | struct acpi_hest_generic *generic; |
| 510 | struct ghes *ghes = NULL; |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 511 | int rc = -EINVAL; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 512 | |
Jin Dongming | 1dd6b20 | 2010-09-29 19:53:53 +0800 | [diff] [blame] | 513 | generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 514 | if (!generic->enabled) |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 515 | return -ENODEV; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 516 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 517 | switch (generic->notify.type) { |
| 518 | case ACPI_HEST_NOTIFY_POLLED: |
| 519 | case ACPI_HEST_NOTIFY_EXTERNAL: |
| 520 | case ACPI_HEST_NOTIFY_SCI: |
| 521 | case ACPI_HEST_NOTIFY_NMI: |
| 522 | break; |
| 523 | case ACPI_HEST_NOTIFY_LOCAL: |
| 524 | pr_warning(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n", |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 525 | generic->header.source_id); |
| 526 | goto err; |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 527 | default: |
| 528 | pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n", |
| 529 | generic->notify.type, generic->header.source_id); |
| 530 | goto err; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 531 | } |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 532 | |
| 533 | rc = -EIO; |
| 534 | if (generic->error_block_length < |
| 535 | sizeof(struct acpi_hest_generic_status)) { |
| 536 | pr_warning(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n", |
| 537 | generic->error_block_length, |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 538 | generic->header.source_id); |
| 539 | goto err; |
| 540 | } |
| 541 | ghes = ghes_new(generic); |
| 542 | if (IS_ERR(ghes)) { |
| 543 | rc = PTR_ERR(ghes); |
| 544 | ghes = NULL; |
| 545 | goto err; |
| 546 | } |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 547 | switch (generic->notify.type) { |
| 548 | case ACPI_HEST_NOTIFY_POLLED: |
| 549 | ghes->timer.function = ghes_poll_func; |
| 550 | ghes->timer.data = (unsigned long)ghes; |
| 551 | init_timer_deferrable(&ghes->timer); |
| 552 | ghes_add_timer(ghes); |
| 553 | break; |
| 554 | case ACPI_HEST_NOTIFY_EXTERNAL: |
| 555 | /* External interrupt vector is GSI */ |
| 556 | if (acpi_gsi_to_irq(generic->notify.vector, &ghes->irq)) { |
| 557 | pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n", |
| 558 | generic->header.source_id); |
| 559 | goto err; |
| 560 | } |
| 561 | if (request_irq(ghes->irq, ghes_irq_func, |
| 562 | 0, "GHES IRQ", ghes)) { |
| 563 | pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n", |
| 564 | generic->header.source_id); |
| 565 | goto err; |
| 566 | } |
| 567 | break; |
| 568 | case ACPI_HEST_NOTIFY_SCI: |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 569 | mutex_lock(&ghes_list_mutex); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 570 | if (list_empty(&ghes_sci)) |
| 571 | register_acpi_hed_notifier(&ghes_notifier_sci); |
| 572 | list_add_rcu(&ghes->list, &ghes_sci); |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 573 | mutex_unlock(&ghes_list_mutex); |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 574 | break; |
| 575 | case ACPI_HEST_NOTIFY_NMI: |
| 576 | mutex_lock(&ghes_list_mutex); |
| 577 | if (list_empty(&ghes_nmi)) |
| 578 | register_die_notifier(&ghes_notifier_nmi); |
| 579 | list_add_rcu(&ghes->list, &ghes_nmi); |
| 580 | mutex_unlock(&ghes_list_mutex); |
| 581 | break; |
| 582 | default: |
| 583 | BUG(); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 584 | } |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 585 | platform_set_drvdata(ghes_dev, ghes); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 586 | |
| 587 | return 0; |
| 588 | err: |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 589 | if (ghes) { |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 590 | ghes_fini(ghes); |
| 591 | kfree(ghes); |
| 592 | } |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 593 | return rc; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 594 | } |
| 595 | |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 596 | static int __devexit ghes_remove(struct platform_device *ghes_dev) |
| 597 | { |
| 598 | struct ghes *ghes; |
| 599 | struct acpi_hest_generic *generic; |
| 600 | |
| 601 | ghes = platform_get_drvdata(ghes_dev); |
| 602 | generic = ghes->generic; |
| 603 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 604 | ghes->flags |= GHES_EXITING; |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 605 | switch (generic->notify.type) { |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 606 | case ACPI_HEST_NOTIFY_POLLED: |
| 607 | del_timer_sync(&ghes->timer); |
| 608 | break; |
| 609 | case ACPI_HEST_NOTIFY_EXTERNAL: |
| 610 | free_irq(ghes->irq, ghes); |
| 611 | break; |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 612 | case ACPI_HEST_NOTIFY_SCI: |
| 613 | mutex_lock(&ghes_list_mutex); |
| 614 | list_del_rcu(&ghes->list); |
| 615 | if (list_empty(&ghes_sci)) |
| 616 | unregister_acpi_hed_notifier(&ghes_notifier_sci); |
| 617 | mutex_unlock(&ghes_list_mutex); |
| 618 | break; |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 619 | case ACPI_HEST_NOTIFY_NMI: |
| 620 | mutex_lock(&ghes_list_mutex); |
| 621 | list_del_rcu(&ghes->list); |
| 622 | if (list_empty(&ghes_nmi)) |
| 623 | unregister_die_notifier(&ghes_notifier_nmi); |
| 624 | mutex_unlock(&ghes_list_mutex); |
| 625 | /* |
| 626 | * To synchronize with NMI handler, ghes can only be |
| 627 | * freed after NMI handler finishes. |
| 628 | */ |
| 629 | synchronize_rcu(); |
| 630 | break; |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 631 | default: |
| 632 | BUG(); |
| 633 | break; |
| 634 | } |
| 635 | |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 636 | ghes_fini(ghes); |
| 637 | kfree(ghes); |
| 638 | |
| 639 | platform_set_drvdata(ghes_dev, NULL); |
| 640 | |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | static struct platform_driver ghes_platform_driver = { |
| 645 | .driver = { |
| 646 | .name = "GHES", |
| 647 | .owner = THIS_MODULE, |
| 648 | }, |
| 649 | .probe = ghes_probe, |
| 650 | .remove = ghes_remove, |
| 651 | }; |
| 652 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 653 | static int __init ghes_init(void) |
| 654 | { |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 655 | int rc; |
| 656 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 657 | if (acpi_disabled) |
| 658 | return -ENODEV; |
| 659 | |
| 660 | if (hest_disable) { |
| 661 | pr_info(GHES_PFX "HEST is not enabled!\n"); |
| 662 | return -EINVAL; |
| 663 | } |
| 664 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 665 | rc = ghes_ioremap_init(); |
| 666 | if (rc) |
| 667 | goto err; |
| 668 | |
| 669 | rc = platform_driver_register(&ghes_platform_driver); |
| 670 | if (rc) |
| 671 | goto err_ioremap_exit; |
| 672 | |
| 673 | return 0; |
| 674 | err_ioremap_exit: |
| 675 | ghes_ioremap_exit(); |
| 676 | err: |
| 677 | return rc; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | static void __exit ghes_exit(void) |
| 681 | { |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 682 | platform_driver_unregister(&ghes_platform_driver); |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 683 | ghes_ioremap_exit(); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 684 | } |
| 685 | |
| 686 | module_init(ghes_init); |
| 687 | module_exit(ghes_exit); |
| 688 | |
| 689 | MODULE_AUTHOR("Huang Ying"); |
| 690 | MODULE_DESCRIPTION("APEI Generic Hardware Error Source support"); |
| 691 | MODULE_LICENSE("GPL"); |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 692 | MODULE_ALIAS("platform:GHES"); |