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 | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 15 | * Copyright 2010,2011 Intel Corp. |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 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 | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 45 | #include <linux/irq_work.h> |
| 46 | #include <linux/llist.h> |
| 47 | #include <linux/genalloc.h> |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 48 | #include <acpi/apei.h> |
| 49 | #include <acpi/atomicio.h> |
| 50 | #include <acpi/hed.h> |
| 51 | #include <asm/mce.h> |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 52 | #include <asm/tlbflush.h> |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 53 | |
| 54 | #include "apei-internal.h" |
| 55 | |
| 56 | #define GHES_PFX "GHES: " |
| 57 | |
| 58 | #define GHES_ESTATUS_MAX_SIZE 65536 |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 59 | #define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536 |
| 60 | |
| 61 | #define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3 |
| 62 | |
| 63 | #define GHES_ESTATUS_NODE_LEN(estatus_len) \ |
| 64 | (sizeof(struct ghes_estatus_node) + (estatus_len)) |
| 65 | #define GHES_ESTATUS_FROM_NODE(estatus_node) \ |
| 66 | ((struct acpi_hest_generic_status *) \ |
| 67 | ((struct ghes_estatus_node *)(estatus_node) + 1)) |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 68 | |
| 69 | /* |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 70 | * One struct ghes is created for each generic hardware error source. |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 71 | * It provides the context for APEI hardware error timer/IRQ/SCI/NMI |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 72 | * handler. |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 73 | * |
| 74 | * estatus: memory buffer for error status block, allocated during |
| 75 | * HEST parsing. |
| 76 | */ |
| 77 | #define GHES_TO_CLEAR 0x0001 |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 78 | #define GHES_EXITING 0x0002 |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 79 | |
| 80 | struct ghes { |
| 81 | struct acpi_hest_generic *generic; |
| 82 | struct acpi_hest_generic_status *estatus; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 83 | u64 buffer_paddr; |
| 84 | unsigned long flags; |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 85 | union { |
| 86 | struct list_head list; |
| 87 | struct timer_list timer; |
| 88 | unsigned int irq; |
| 89 | }; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 90 | }; |
| 91 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 92 | struct ghes_estatus_node { |
| 93 | struct llist_node llnode; |
| 94 | struct acpi_hest_generic *generic; |
| 95 | }; |
| 96 | |
Huang Ying | b6a9501 | 2011-07-13 13:14:19 +0800 | [diff] [blame] | 97 | int ghes_disable; |
| 98 | module_param_named(disable, ghes_disable, bool, 0); |
| 99 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 100 | static int ghes_panic_timeout __read_mostly = 30; |
| 101 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 102 | /* |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 103 | * All error sources notified with SCI shares one notifier function, |
| 104 | * so they need to be linked and checked one by one. This is applied |
| 105 | * to NMI too. |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 106 | * |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 107 | * RCU is used for these lists, so ghes_list_mutex is only used for |
| 108 | * list changing, not for traversing. |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 109 | */ |
| 110 | static LIST_HEAD(ghes_sci); |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 111 | static LIST_HEAD(ghes_nmi); |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 112 | static DEFINE_MUTEX(ghes_list_mutex); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 113 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 114 | /* |
| 115 | * NMI may be triggered on any CPU, so ghes_nmi_lock is used for |
| 116 | * mutual exclusion. |
| 117 | */ |
| 118 | static DEFINE_RAW_SPINLOCK(ghes_nmi_lock); |
| 119 | |
| 120 | /* |
| 121 | * Because the memory area used to transfer hardware error information |
| 122 | * from BIOS to Linux can be determined only in NMI, IRQ or timer |
| 123 | * handler, but general ioremap can not be used in atomic context, so |
| 124 | * a special version of atomic ioremap is implemented for that. |
| 125 | */ |
| 126 | |
| 127 | /* |
| 128 | * Two virtual pages are used, one for NMI context, the other for |
| 129 | * IRQ/PROCESS context |
| 130 | */ |
| 131 | #define GHES_IOREMAP_PAGES 2 |
| 132 | #define GHES_IOREMAP_NMI_PAGE(base) (base) |
| 133 | #define GHES_IOREMAP_IRQ_PAGE(base) ((base) + PAGE_SIZE) |
| 134 | |
| 135 | /* virtual memory area for atomic ioremap */ |
| 136 | static struct vm_struct *ghes_ioremap_area; |
| 137 | /* |
| 138 | * These 2 spinlock is used to prevent atomic ioremap virtual memory |
| 139 | * area from being mapped simultaneously. |
| 140 | */ |
| 141 | static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi); |
| 142 | static DEFINE_SPINLOCK(ghes_ioremap_lock_irq); |
| 143 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 144 | /* |
| 145 | * printk is not safe in NMI context. So in NMI handler, we allocate |
| 146 | * required memory from lock-less memory allocator |
| 147 | * (ghes_estatus_pool), save estatus into it, put them into lock-less |
| 148 | * list (ghes_estatus_llist), then delay printk into IRQ context via |
| 149 | * irq_work (ghes_proc_irq_work). ghes_estatus_size_request record |
| 150 | * required pool size by all NMI error source. |
| 151 | */ |
| 152 | static struct gen_pool *ghes_estatus_pool; |
| 153 | static unsigned long ghes_estatus_pool_size_request; |
| 154 | static struct llist_head ghes_estatus_llist; |
| 155 | static struct irq_work ghes_proc_irq_work; |
| 156 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 157 | static int ghes_ioremap_init(void) |
| 158 | { |
| 159 | ghes_ioremap_area = __get_vm_area(PAGE_SIZE * GHES_IOREMAP_PAGES, |
| 160 | VM_IOREMAP, VMALLOC_START, VMALLOC_END); |
| 161 | if (!ghes_ioremap_area) { |
| 162 | pr_err(GHES_PFX "Failed to allocate virtual memory area for atomic ioremap.\n"); |
| 163 | return -ENOMEM; |
| 164 | } |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static void ghes_ioremap_exit(void) |
| 170 | { |
| 171 | free_vm_area(ghes_ioremap_area); |
| 172 | } |
| 173 | |
| 174 | static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn) |
| 175 | { |
| 176 | unsigned long vaddr; |
| 177 | |
| 178 | vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr); |
| 179 | ioremap_page_range(vaddr, vaddr + PAGE_SIZE, |
| 180 | pfn << PAGE_SHIFT, PAGE_KERNEL); |
| 181 | |
| 182 | return (void __iomem *)vaddr; |
| 183 | } |
| 184 | |
| 185 | static void __iomem *ghes_ioremap_pfn_irq(u64 pfn) |
| 186 | { |
| 187 | unsigned long vaddr; |
| 188 | |
| 189 | vaddr = (unsigned long)GHES_IOREMAP_IRQ_PAGE(ghes_ioremap_area->addr); |
| 190 | ioremap_page_range(vaddr, vaddr + PAGE_SIZE, |
| 191 | pfn << PAGE_SHIFT, PAGE_KERNEL); |
| 192 | |
| 193 | return (void __iomem *)vaddr; |
| 194 | } |
| 195 | |
| 196 | static void ghes_iounmap_nmi(void __iomem *vaddr_ptr) |
| 197 | { |
| 198 | unsigned long vaddr = (unsigned long __force)vaddr_ptr; |
| 199 | void *base = ghes_ioremap_area->addr; |
| 200 | |
| 201 | BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_NMI_PAGE(base)); |
| 202 | unmap_kernel_range_noflush(vaddr, PAGE_SIZE); |
| 203 | __flush_tlb_one(vaddr); |
| 204 | } |
| 205 | |
| 206 | static void ghes_iounmap_irq(void __iomem *vaddr_ptr) |
| 207 | { |
| 208 | unsigned long vaddr = (unsigned long __force)vaddr_ptr; |
| 209 | void *base = ghes_ioremap_area->addr; |
| 210 | |
| 211 | BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_IRQ_PAGE(base)); |
| 212 | unmap_kernel_range_noflush(vaddr, PAGE_SIZE); |
| 213 | __flush_tlb_one(vaddr); |
| 214 | } |
| 215 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 216 | static int ghes_estatus_pool_init(void) |
| 217 | { |
| 218 | ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1); |
| 219 | if (!ghes_estatus_pool) |
| 220 | return -ENOMEM; |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | static void ghes_estatus_pool_free_chunk_page(struct gen_pool *pool, |
| 225 | struct gen_pool_chunk *chunk, |
| 226 | void *data) |
| 227 | { |
| 228 | free_page(chunk->start_addr); |
| 229 | } |
| 230 | |
| 231 | static void ghes_estatus_pool_exit(void) |
| 232 | { |
| 233 | gen_pool_for_each_chunk(ghes_estatus_pool, |
| 234 | ghes_estatus_pool_free_chunk_page, NULL); |
| 235 | gen_pool_destroy(ghes_estatus_pool); |
| 236 | } |
| 237 | |
| 238 | static int ghes_estatus_pool_expand(unsigned long len) |
| 239 | { |
| 240 | unsigned long i, pages, size, addr; |
| 241 | int ret; |
| 242 | |
| 243 | ghes_estatus_pool_size_request += PAGE_ALIGN(len); |
| 244 | size = gen_pool_size(ghes_estatus_pool); |
| 245 | if (size >= ghes_estatus_pool_size_request) |
| 246 | return 0; |
| 247 | pages = (ghes_estatus_pool_size_request - size) / PAGE_SIZE; |
| 248 | for (i = 0; i < pages; i++) { |
| 249 | addr = __get_free_page(GFP_KERNEL); |
| 250 | if (!addr) |
| 251 | return -ENOMEM; |
| 252 | ret = gen_pool_add(ghes_estatus_pool, addr, PAGE_SIZE, -1); |
| 253 | if (ret) |
| 254 | return ret; |
| 255 | } |
| 256 | |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | static void ghes_estatus_pool_shrink(unsigned long len) |
| 261 | { |
| 262 | ghes_estatus_pool_size_request -= PAGE_ALIGN(len); |
| 263 | } |
| 264 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 265 | static struct ghes *ghes_new(struct acpi_hest_generic *generic) |
| 266 | { |
| 267 | struct ghes *ghes; |
| 268 | unsigned int error_block_length; |
| 269 | int rc; |
| 270 | |
| 271 | ghes = kzalloc(sizeof(*ghes), GFP_KERNEL); |
| 272 | if (!ghes) |
| 273 | return ERR_PTR(-ENOMEM); |
| 274 | ghes->generic = generic; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 275 | rc = acpi_pre_map_gar(&generic->error_status_address); |
| 276 | if (rc) |
| 277 | goto err_free; |
| 278 | error_block_length = generic->error_block_length; |
| 279 | if (error_block_length > GHES_ESTATUS_MAX_SIZE) { |
| 280 | pr_warning(FW_WARN GHES_PFX |
| 281 | "Error status block length is too long: %u for " |
| 282 | "generic hardware error source: %d.\n", |
| 283 | error_block_length, generic->header.source_id); |
| 284 | error_block_length = GHES_ESTATUS_MAX_SIZE; |
| 285 | } |
| 286 | ghes->estatus = kmalloc(error_block_length, GFP_KERNEL); |
| 287 | if (!ghes->estatus) { |
| 288 | rc = -ENOMEM; |
| 289 | goto err_unmap; |
| 290 | } |
| 291 | |
| 292 | return ghes; |
| 293 | |
| 294 | err_unmap: |
| 295 | acpi_post_unmap_gar(&generic->error_status_address); |
| 296 | err_free: |
| 297 | kfree(ghes); |
| 298 | return ERR_PTR(rc); |
| 299 | } |
| 300 | |
| 301 | static void ghes_fini(struct ghes *ghes) |
| 302 | { |
| 303 | kfree(ghes->estatus); |
| 304 | acpi_post_unmap_gar(&ghes->generic->error_status_address); |
| 305 | } |
| 306 | |
| 307 | enum { |
Huang Ying | ad4ecef | 2010-08-02 15:48:23 +0800 | [diff] [blame] | 308 | GHES_SEV_NO = 0x0, |
| 309 | GHES_SEV_CORRECTED = 0x1, |
| 310 | GHES_SEV_RECOVERABLE = 0x2, |
| 311 | GHES_SEV_PANIC = 0x3, |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 312 | }; |
| 313 | |
| 314 | static inline int ghes_severity(int severity) |
| 315 | { |
| 316 | switch (severity) { |
Huang Ying | ad4ecef | 2010-08-02 15:48:23 +0800 | [diff] [blame] | 317 | case CPER_SEV_INFORMATIONAL: |
| 318 | return GHES_SEV_NO; |
| 319 | case CPER_SEV_CORRECTED: |
| 320 | return GHES_SEV_CORRECTED; |
| 321 | case CPER_SEV_RECOVERABLE: |
| 322 | return GHES_SEV_RECOVERABLE; |
| 323 | case CPER_SEV_FATAL: |
| 324 | return GHES_SEV_PANIC; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 325 | default: |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 326 | /* Unknown, go panic */ |
Huang Ying | ad4ecef | 2010-08-02 15:48:23 +0800 | [diff] [blame] | 327 | return GHES_SEV_PANIC; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 328 | } |
| 329 | } |
| 330 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 331 | static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len, |
| 332 | int from_phys) |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 333 | { |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 334 | void __iomem *vaddr; |
| 335 | unsigned long flags = 0; |
| 336 | int in_nmi = in_nmi(); |
| 337 | u64 offset; |
| 338 | u32 trunk; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 339 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 340 | while (len > 0) { |
| 341 | offset = paddr - (paddr & PAGE_MASK); |
| 342 | if (in_nmi) { |
| 343 | raw_spin_lock(&ghes_ioremap_lock_nmi); |
| 344 | vaddr = ghes_ioremap_pfn_nmi(paddr >> PAGE_SHIFT); |
| 345 | } else { |
| 346 | spin_lock_irqsave(&ghes_ioremap_lock_irq, flags); |
| 347 | vaddr = ghes_ioremap_pfn_irq(paddr >> PAGE_SHIFT); |
| 348 | } |
| 349 | trunk = PAGE_SIZE - offset; |
| 350 | trunk = min(trunk, len); |
| 351 | if (from_phys) |
| 352 | memcpy_fromio(buffer, vaddr + offset, trunk); |
| 353 | else |
| 354 | memcpy_toio(vaddr + offset, buffer, trunk); |
| 355 | len -= trunk; |
| 356 | paddr += trunk; |
| 357 | buffer += trunk; |
| 358 | if (in_nmi) { |
| 359 | ghes_iounmap_nmi(vaddr); |
| 360 | raw_spin_unlock(&ghes_ioremap_lock_nmi); |
| 361 | } else { |
| 362 | ghes_iounmap_irq(vaddr); |
| 363 | spin_unlock_irqrestore(&ghes_ioremap_lock_irq, flags); |
| 364 | } |
| 365 | } |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | static int ghes_read_estatus(struct ghes *ghes, int silent) |
| 369 | { |
| 370 | struct acpi_hest_generic *g = ghes->generic; |
| 371 | u64 buf_paddr; |
| 372 | u32 len; |
| 373 | int rc; |
| 374 | |
| 375 | rc = acpi_atomic_read(&buf_paddr, &g->error_status_address); |
| 376 | if (rc) { |
| 377 | if (!silent && printk_ratelimit()) |
| 378 | pr_warning(FW_WARN GHES_PFX |
| 379 | "Failed to read error status block address for hardware error source: %d.\n", |
| 380 | g->header.source_id); |
| 381 | return -EIO; |
| 382 | } |
| 383 | if (!buf_paddr) |
| 384 | return -ENOENT; |
| 385 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 386 | ghes_copy_tofrom_phys(ghes->estatus, buf_paddr, |
| 387 | sizeof(*ghes->estatus), 1); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 388 | if (!ghes->estatus->block_status) |
| 389 | return -ENOENT; |
| 390 | |
| 391 | ghes->buffer_paddr = buf_paddr; |
| 392 | ghes->flags |= GHES_TO_CLEAR; |
| 393 | |
| 394 | rc = -EIO; |
| 395 | len = apei_estatus_len(ghes->estatus); |
| 396 | if (len < sizeof(*ghes->estatus)) |
| 397 | goto err_read_block; |
| 398 | if (len > ghes->generic->error_block_length) |
| 399 | goto err_read_block; |
| 400 | if (apei_estatus_check_header(ghes->estatus)) |
| 401 | goto err_read_block; |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 402 | ghes_copy_tofrom_phys(ghes->estatus + 1, |
| 403 | buf_paddr + sizeof(*ghes->estatus), |
| 404 | len - sizeof(*ghes->estatus), 1); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 405 | if (apei_estatus_check(ghes->estatus)) |
| 406 | goto err_read_block; |
| 407 | rc = 0; |
| 408 | |
| 409 | err_read_block: |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 410 | if (rc && !silent && printk_ratelimit()) |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 411 | pr_warning(FW_WARN GHES_PFX |
| 412 | "Failed to read error status block!\n"); |
| 413 | return rc; |
| 414 | } |
| 415 | |
| 416 | static void ghes_clear_estatus(struct ghes *ghes) |
| 417 | { |
| 418 | ghes->estatus->block_status = 0; |
| 419 | if (!(ghes->flags & GHES_TO_CLEAR)) |
| 420 | return; |
| 421 | ghes_copy_tofrom_phys(ghes->estatus, ghes->buffer_paddr, |
| 422 | sizeof(ghes->estatus->block_status), 0); |
| 423 | ghes->flags &= ~GHES_TO_CLEAR; |
| 424 | } |
| 425 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 426 | static void ghes_do_proc(const struct acpi_hest_generic_status *estatus) |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 427 | { |
Huang Ying | ad4ecef | 2010-08-02 15:48:23 +0800 | [diff] [blame] | 428 | int sev, processed = 0; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 429 | struct acpi_hest_generic_data *gdata; |
| 430 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 431 | sev = ghes_severity(estatus->error_severity); |
| 432 | apei_estatus_for_each_section(estatus, gdata) { |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 433 | #ifdef CONFIG_X86_MCE |
| 434 | if (!uuid_le_cmp(*(uuid_le *)gdata->section_type, |
| 435 | CPER_SEC_PLATFORM_MEM)) { |
| 436 | apei_mce_report_mem_error( |
Huang Ying | ad4ecef | 2010-08-02 15:48:23 +0800 | [diff] [blame] | 437 | sev == GHES_SEV_CORRECTED, |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 438 | (struct cper_sec_mem_err *)(gdata+1)); |
| 439 | processed = 1; |
| 440 | } |
| 441 | #endif |
| 442 | } |
Huang Ying | 32c361f | 2010-12-07 10:22:31 +0800 | [diff] [blame] | 443 | } |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 444 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 445 | static void __ghes_print_estatus(const char *pfx, |
| 446 | const struct acpi_hest_generic *generic, |
| 447 | const struct acpi_hest_generic_status *estatus) |
Huang Ying | 32c361f | 2010-12-07 10:22:31 +0800 | [diff] [blame] | 448 | { |
Huang Ying | 32c361f | 2010-12-07 10:22:31 +0800 | [diff] [blame] | 449 | if (pfx == NULL) { |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 450 | if (ghes_severity(estatus->error_severity) <= |
Huang Ying | 32c361f | 2010-12-07 10:22:31 +0800 | [diff] [blame] | 451 | GHES_SEV_CORRECTED) |
| 452 | pfx = KERN_WARNING HW_ERR; |
| 453 | else |
| 454 | pfx = KERN_ERR HW_ERR; |
| 455 | } |
Huang Ying | 5588340 | 2011-07-13 13:14:15 +0800 | [diff] [blame] | 456 | printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n", |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 457 | pfx, generic->header.source_id); |
| 458 | apei_estatus_print(pfx, estatus); |
Huang Ying | 5588340 | 2011-07-13 13:14:15 +0800 | [diff] [blame] | 459 | } |
| 460 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 461 | static void ghes_print_estatus(const char *pfx, |
| 462 | const struct acpi_hest_generic *generic, |
| 463 | const struct acpi_hest_generic_status *estatus) |
Huang Ying | 5588340 | 2011-07-13 13:14:15 +0800 | [diff] [blame] | 464 | { |
| 465 | /* Not more than 2 messages every 5 seconds */ |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 466 | static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2); |
| 467 | static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2); |
| 468 | struct ratelimit_state *ratelimit; |
Huang Ying | 5588340 | 2011-07-13 13:14:15 +0800 | [diff] [blame] | 469 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 470 | if (ghes_severity(estatus->error_severity) <= GHES_SEV_CORRECTED) |
| 471 | ratelimit = &ratelimit_corrected; |
| 472 | else |
| 473 | ratelimit = &ratelimit_uncorrected; |
| 474 | if (__ratelimit(ratelimit)) |
| 475 | __ghes_print_estatus(pfx, generic, estatus); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 476 | } |
| 477 | |
| 478 | static int ghes_proc(struct ghes *ghes) |
| 479 | { |
| 480 | int rc; |
| 481 | |
| 482 | rc = ghes_read_estatus(ghes, 0); |
| 483 | if (rc) |
| 484 | goto out; |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 485 | ghes_print_estatus(NULL, ghes->generic, ghes->estatus); |
| 486 | ghes_do_proc(ghes->estatus); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 487 | |
| 488 | out: |
| 489 | ghes_clear_estatus(ghes); |
| 490 | return 0; |
| 491 | } |
| 492 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 493 | static void ghes_add_timer(struct ghes *ghes) |
| 494 | { |
| 495 | struct acpi_hest_generic *g = ghes->generic; |
| 496 | unsigned long expire; |
| 497 | |
| 498 | if (!g->notify.poll_interval) { |
| 499 | pr_warning(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n", |
| 500 | g->header.source_id); |
| 501 | return; |
| 502 | } |
| 503 | expire = jiffies + msecs_to_jiffies(g->notify.poll_interval); |
| 504 | ghes->timer.expires = round_jiffies_relative(expire); |
| 505 | add_timer(&ghes->timer); |
| 506 | } |
| 507 | |
| 508 | static void ghes_poll_func(unsigned long data) |
| 509 | { |
| 510 | struct ghes *ghes = (void *)data; |
| 511 | |
| 512 | ghes_proc(ghes); |
| 513 | if (!(ghes->flags & GHES_EXITING)) |
| 514 | ghes_add_timer(ghes); |
| 515 | } |
| 516 | |
| 517 | static irqreturn_t ghes_irq_func(int irq, void *data) |
| 518 | { |
| 519 | struct ghes *ghes = data; |
| 520 | int rc; |
| 521 | |
| 522 | rc = ghes_proc(ghes); |
| 523 | if (rc) |
| 524 | return IRQ_NONE; |
| 525 | |
| 526 | return IRQ_HANDLED; |
| 527 | } |
| 528 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 529 | static int ghes_notify_sci(struct notifier_block *this, |
| 530 | unsigned long event, void *data) |
| 531 | { |
| 532 | struct ghes *ghes; |
| 533 | int ret = NOTIFY_DONE; |
| 534 | |
| 535 | rcu_read_lock(); |
| 536 | list_for_each_entry_rcu(ghes, &ghes_sci, list) { |
| 537 | if (!ghes_proc(ghes)) |
| 538 | ret = NOTIFY_OK; |
| 539 | } |
| 540 | rcu_read_unlock(); |
| 541 | |
| 542 | return ret; |
| 543 | } |
| 544 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 545 | static void ghes_proc_in_irq(struct irq_work *irq_work) |
| 546 | { |
| 547 | struct llist_node *llnode, *next, *tail = NULL; |
| 548 | struct ghes_estatus_node *estatus_node; |
| 549 | struct acpi_hest_generic_status *estatus; |
| 550 | u32 len, node_len; |
| 551 | |
| 552 | /* |
| 553 | * Because the time order of estatus in list is reversed, |
| 554 | * revert it back to proper order. |
| 555 | */ |
| 556 | llnode = llist_del_all(&ghes_estatus_llist); |
| 557 | while (llnode) { |
| 558 | next = llnode->next; |
| 559 | llnode->next = tail; |
| 560 | tail = llnode; |
| 561 | llnode = next; |
| 562 | } |
| 563 | llnode = tail; |
| 564 | while (llnode) { |
| 565 | next = llnode->next; |
| 566 | estatus_node = llist_entry(llnode, struct ghes_estatus_node, |
| 567 | llnode); |
| 568 | estatus = GHES_ESTATUS_FROM_NODE(estatus_node); |
| 569 | len = apei_estatus_len(estatus); |
| 570 | node_len = GHES_ESTATUS_NODE_LEN(len); |
| 571 | ghes_do_proc(estatus); |
| 572 | ghes_print_estatus(NULL, estatus_node->generic, estatus); |
| 573 | gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node, |
| 574 | node_len); |
| 575 | llnode = next; |
| 576 | } |
| 577 | } |
| 578 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 579 | static int ghes_notify_nmi(struct notifier_block *this, |
| 580 | unsigned long cmd, void *data) |
| 581 | { |
| 582 | struct ghes *ghes, *ghes_global = NULL; |
| 583 | int sev, sev_global = -1; |
| 584 | int ret = NOTIFY_DONE; |
| 585 | |
| 586 | if (cmd != DIE_NMI) |
| 587 | return ret; |
| 588 | |
| 589 | raw_spin_lock(&ghes_nmi_lock); |
| 590 | list_for_each_entry_rcu(ghes, &ghes_nmi, list) { |
| 591 | if (ghes_read_estatus(ghes, 1)) { |
| 592 | ghes_clear_estatus(ghes); |
| 593 | continue; |
| 594 | } |
| 595 | sev = ghes_severity(ghes->estatus->error_severity); |
| 596 | if (sev > sev_global) { |
| 597 | sev_global = sev; |
| 598 | ghes_global = ghes; |
| 599 | } |
| 600 | ret = NOTIFY_STOP; |
| 601 | } |
| 602 | |
| 603 | if (ret == NOTIFY_DONE) |
| 604 | goto out; |
| 605 | |
| 606 | if (sev_global >= GHES_SEV_PANIC) { |
| 607 | oops_begin(); |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 608 | __ghes_print_estatus(KERN_EMERG HW_ERR, ghes_global->generic, |
| 609 | ghes_global->estatus); |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 610 | /* reboot to log the error! */ |
| 611 | if (panic_timeout == 0) |
| 612 | panic_timeout = ghes_panic_timeout; |
| 613 | panic("Fatal hardware error!"); |
| 614 | } |
| 615 | |
| 616 | list_for_each_entry_rcu(ghes, &ghes_nmi, list) { |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 617 | #ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG |
| 618 | u32 len, node_len; |
| 619 | struct ghes_estatus_node *estatus_node; |
| 620 | struct acpi_hest_generic_status *estatus; |
| 621 | #endif |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 622 | if (!(ghes->flags & GHES_TO_CLEAR)) |
| 623 | continue; |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 624 | #ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG |
| 625 | /* Save estatus for further processing in IRQ context */ |
| 626 | len = apei_estatus_len(ghes->estatus); |
| 627 | node_len = GHES_ESTATUS_NODE_LEN(len); |
| 628 | estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool, |
| 629 | node_len); |
| 630 | if (estatus_node) { |
| 631 | estatus_node->generic = ghes->generic; |
| 632 | estatus = GHES_ESTATUS_FROM_NODE(estatus_node); |
| 633 | memcpy(estatus, ghes->estatus, len); |
| 634 | llist_add(&estatus_node->llnode, &ghes_estatus_llist); |
| 635 | } |
| 636 | #endif |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 637 | ghes_clear_estatus(ghes); |
| 638 | } |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 639 | #ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG |
| 640 | irq_work_queue(&ghes_proc_irq_work); |
| 641 | #endif |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 642 | |
| 643 | out: |
| 644 | raw_spin_unlock(&ghes_nmi_lock); |
| 645 | return ret; |
| 646 | } |
| 647 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 648 | static struct notifier_block ghes_notifier_sci = { |
| 649 | .notifier_call = ghes_notify_sci, |
| 650 | }; |
| 651 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 652 | static struct notifier_block ghes_notifier_nmi = { |
| 653 | .notifier_call = ghes_notify_nmi, |
| 654 | }; |
| 655 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 656 | static unsigned long ghes_esource_prealloc_size( |
| 657 | const struct acpi_hest_generic *generic) |
| 658 | { |
| 659 | unsigned long block_length, prealloc_records, prealloc_size; |
| 660 | |
| 661 | block_length = min_t(unsigned long, generic->error_block_length, |
| 662 | GHES_ESTATUS_MAX_SIZE); |
| 663 | prealloc_records = max_t(unsigned long, |
| 664 | generic->records_to_preallocate, 1); |
| 665 | prealloc_size = min_t(unsigned long, block_length * prealloc_records, |
| 666 | GHES_ESOURCE_PREALLOC_MAX_SIZE); |
| 667 | |
| 668 | return prealloc_size; |
| 669 | } |
| 670 | |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 671 | static int __devinit ghes_probe(struct platform_device *ghes_dev) |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 672 | { |
| 673 | struct acpi_hest_generic *generic; |
| 674 | struct ghes *ghes = NULL; |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 675 | unsigned long len; |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 676 | int rc = -EINVAL; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 677 | |
Jin Dongming | 1dd6b20 | 2010-09-29 19:53:53 +0800 | [diff] [blame] | 678 | generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 679 | if (!generic->enabled) |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 680 | return -ENODEV; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 681 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 682 | switch (generic->notify.type) { |
| 683 | case ACPI_HEST_NOTIFY_POLLED: |
| 684 | case ACPI_HEST_NOTIFY_EXTERNAL: |
| 685 | case ACPI_HEST_NOTIFY_SCI: |
| 686 | case ACPI_HEST_NOTIFY_NMI: |
| 687 | break; |
| 688 | case ACPI_HEST_NOTIFY_LOCAL: |
| 689 | 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] | 690 | generic->header.source_id); |
| 691 | goto err; |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 692 | default: |
| 693 | pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n", |
| 694 | generic->notify.type, generic->header.source_id); |
| 695 | goto err; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 696 | } |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 697 | |
| 698 | rc = -EIO; |
| 699 | if (generic->error_block_length < |
| 700 | sizeof(struct acpi_hest_generic_status)) { |
| 701 | pr_warning(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n", |
| 702 | generic->error_block_length, |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 703 | generic->header.source_id); |
| 704 | goto err; |
| 705 | } |
| 706 | ghes = ghes_new(generic); |
| 707 | if (IS_ERR(ghes)) { |
| 708 | rc = PTR_ERR(ghes); |
| 709 | ghes = NULL; |
| 710 | goto err; |
| 711 | } |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 712 | switch (generic->notify.type) { |
| 713 | case ACPI_HEST_NOTIFY_POLLED: |
| 714 | ghes->timer.function = ghes_poll_func; |
| 715 | ghes->timer.data = (unsigned long)ghes; |
| 716 | init_timer_deferrable(&ghes->timer); |
| 717 | ghes_add_timer(ghes); |
| 718 | break; |
| 719 | case ACPI_HEST_NOTIFY_EXTERNAL: |
| 720 | /* External interrupt vector is GSI */ |
| 721 | if (acpi_gsi_to_irq(generic->notify.vector, &ghes->irq)) { |
| 722 | pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n", |
| 723 | generic->header.source_id); |
| 724 | goto err; |
| 725 | } |
| 726 | if (request_irq(ghes->irq, ghes_irq_func, |
| 727 | 0, "GHES IRQ", ghes)) { |
| 728 | pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n", |
| 729 | generic->header.source_id); |
| 730 | goto err; |
| 731 | } |
| 732 | break; |
| 733 | case ACPI_HEST_NOTIFY_SCI: |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 734 | mutex_lock(&ghes_list_mutex); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 735 | if (list_empty(&ghes_sci)) |
| 736 | register_acpi_hed_notifier(&ghes_notifier_sci); |
| 737 | list_add_rcu(&ghes->list, &ghes_sci); |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 738 | mutex_unlock(&ghes_list_mutex); |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 739 | break; |
| 740 | case ACPI_HEST_NOTIFY_NMI: |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 741 | len = ghes_esource_prealloc_size(generic); |
| 742 | ghes_estatus_pool_expand(len); |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 743 | mutex_lock(&ghes_list_mutex); |
| 744 | if (list_empty(&ghes_nmi)) |
| 745 | register_die_notifier(&ghes_notifier_nmi); |
| 746 | list_add_rcu(&ghes->list, &ghes_nmi); |
| 747 | mutex_unlock(&ghes_list_mutex); |
| 748 | break; |
| 749 | default: |
| 750 | BUG(); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 751 | } |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 752 | platform_set_drvdata(ghes_dev, ghes); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 753 | |
| 754 | return 0; |
| 755 | err: |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 756 | if (ghes) { |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 757 | ghes_fini(ghes); |
| 758 | kfree(ghes); |
| 759 | } |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 760 | return rc; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 761 | } |
| 762 | |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 763 | static int __devexit ghes_remove(struct platform_device *ghes_dev) |
| 764 | { |
| 765 | struct ghes *ghes; |
| 766 | struct acpi_hest_generic *generic; |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 767 | unsigned long len; |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 768 | |
| 769 | ghes = platform_get_drvdata(ghes_dev); |
| 770 | generic = ghes->generic; |
| 771 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 772 | ghes->flags |= GHES_EXITING; |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 773 | switch (generic->notify.type) { |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 774 | case ACPI_HEST_NOTIFY_POLLED: |
| 775 | del_timer_sync(&ghes->timer); |
| 776 | break; |
| 777 | case ACPI_HEST_NOTIFY_EXTERNAL: |
| 778 | free_irq(ghes->irq, ghes); |
| 779 | break; |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 780 | case ACPI_HEST_NOTIFY_SCI: |
| 781 | mutex_lock(&ghes_list_mutex); |
| 782 | list_del_rcu(&ghes->list); |
| 783 | if (list_empty(&ghes_sci)) |
| 784 | unregister_acpi_hed_notifier(&ghes_notifier_sci); |
| 785 | mutex_unlock(&ghes_list_mutex); |
| 786 | break; |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 787 | case ACPI_HEST_NOTIFY_NMI: |
| 788 | mutex_lock(&ghes_list_mutex); |
| 789 | list_del_rcu(&ghes->list); |
| 790 | if (list_empty(&ghes_nmi)) |
| 791 | unregister_die_notifier(&ghes_notifier_nmi); |
| 792 | mutex_unlock(&ghes_list_mutex); |
| 793 | /* |
| 794 | * To synchronize with NMI handler, ghes can only be |
| 795 | * freed after NMI handler finishes. |
| 796 | */ |
| 797 | synchronize_rcu(); |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 798 | len = ghes_esource_prealloc_size(generic); |
| 799 | ghes_estatus_pool_shrink(len); |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 800 | break; |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 801 | default: |
| 802 | BUG(); |
| 803 | break; |
| 804 | } |
| 805 | |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 806 | ghes_fini(ghes); |
| 807 | kfree(ghes); |
| 808 | |
| 809 | platform_set_drvdata(ghes_dev, NULL); |
| 810 | |
| 811 | return 0; |
| 812 | } |
| 813 | |
| 814 | static struct platform_driver ghes_platform_driver = { |
| 815 | .driver = { |
| 816 | .name = "GHES", |
| 817 | .owner = THIS_MODULE, |
| 818 | }, |
| 819 | .probe = ghes_probe, |
| 820 | .remove = ghes_remove, |
| 821 | }; |
| 822 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 823 | static int __init ghes_init(void) |
| 824 | { |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 825 | int rc; |
| 826 | |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 827 | if (acpi_disabled) |
| 828 | return -ENODEV; |
| 829 | |
| 830 | if (hest_disable) { |
| 831 | pr_info(GHES_PFX "HEST is not enabled!\n"); |
| 832 | return -EINVAL; |
| 833 | } |
| 834 | |
Huang Ying | b6a9501 | 2011-07-13 13:14:19 +0800 | [diff] [blame] | 835 | if (ghes_disable) { |
| 836 | pr_info(GHES_PFX "GHES is not enabled!\n"); |
| 837 | return -EINVAL; |
| 838 | } |
| 839 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 840 | init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq); |
| 841 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 842 | rc = ghes_ioremap_init(); |
| 843 | if (rc) |
| 844 | goto err; |
| 845 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 846 | rc = ghes_estatus_pool_init(); |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 847 | if (rc) |
| 848 | goto err_ioremap_exit; |
| 849 | |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 850 | rc = platform_driver_register(&ghes_platform_driver); |
| 851 | if (rc) |
| 852 | goto err_pool_exit; |
| 853 | |
Huang Ying | 9fb0bfe | 2011-07-13 13:14:21 +0800 | [diff] [blame] | 854 | rc = apei_osc_setup(); |
| 855 | if (rc == 0 && osc_sb_apei_support_acked) |
| 856 | pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n"); |
| 857 | else if (rc == 0 && !osc_sb_apei_support_acked) |
| 858 | pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n"); |
| 859 | else if (rc && osc_sb_apei_support_acked) |
| 860 | pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n"); |
| 861 | else |
| 862 | pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n"); |
| 863 | |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 864 | return 0; |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 865 | err_pool_exit: |
| 866 | ghes_estatus_pool_exit(); |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 867 | err_ioremap_exit: |
| 868 | ghes_ioremap_exit(); |
| 869 | err: |
| 870 | return rc; |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 871 | } |
| 872 | |
| 873 | static void __exit ghes_exit(void) |
| 874 | { |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 875 | platform_driver_unregister(&ghes_platform_driver); |
Huang Ying | 67eb2e9 | 2011-07-13 13:14:25 +0800 | [diff] [blame^] | 876 | ghes_estatus_pool_exit(); |
Huang Ying | 81e88fd | 2011-01-12 14:44:55 +0800 | [diff] [blame] | 877 | ghes_ioremap_exit(); |
Huang Ying | d334a49 | 2010-05-18 14:35:20 +0800 | [diff] [blame] | 878 | } |
| 879 | |
| 880 | module_init(ghes_init); |
| 881 | module_exit(ghes_exit); |
| 882 | |
| 883 | MODULE_AUTHOR("Huang Ying"); |
| 884 | MODULE_DESCRIPTION("APEI Generic Hardware Error Source support"); |
| 885 | MODULE_LICENSE("GPL"); |
Huang Ying | 7ad6e94 | 2010-08-02 15:48:24 +0800 | [diff] [blame] | 886 | MODULE_ALIAS("platform:GHES"); |