blob: e82d0976a5d079bc3aa6b6f956d91d943a685f3b [file] [log] [blame]
Huang Yingd334a492010-05-18 14:35:20 +08001/*
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 Ying67eb2e92011-07-13 13:14:25 +080015 * Copyright 2010,2011 Intel Corp.
Huang Yingd334a492010-05-18 14:35:20 +080016 * 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 Ying81e88fd2011-01-12 14:44:55 +080038#include <linux/timer.h>
Huang Yingd334a492010-05-18 14:35:20 +080039#include <linux/cper.h>
40#include <linux/kdebug.h>
Huang Ying7ad6e942010-08-02 15:48:24 +080041#include <linux/platform_device.h>
42#include <linux/mutex.h>
Huang Ying32c361f2010-12-07 10:22:31 +080043#include <linux/ratelimit.h>
Huang Ying81e88fd2011-01-12 14:44:55 +080044#include <linux/vmalloc.h>
Huang Ying67eb2e92011-07-13 13:14:25 +080045#include <linux/irq_work.h>
46#include <linux/llist.h>
47#include <linux/genalloc.h>
Huang Yinga654e5e2011-12-08 11:25:41 +080048#include <linux/pci.h>
49#include <linux/aer.h>
Tomasz Nowicki44a69f62014-07-22 11:20:12 +020050#include <linux/nmi.h>
Mauro Carvalho Chehab40e06412013-02-15 05:41:22 -030051
52#include <acpi/ghes.h>
Tomasz Nowicki9dae3d02014-07-22 11:20:11 +020053#include <acpi/apei.h>
Huang Ying81e88fd2011-01-12 14:44:55 +080054#include <asm/tlbflush.h>
Huang Yingd334a492010-05-18 14:35:20 +080055
56#include "apei-internal.h"
57
58#define GHES_PFX "GHES: "
59
60#define GHES_ESTATUS_MAX_SIZE 65536
Huang Ying67eb2e92011-07-13 13:14:25 +080061#define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536
62
63#define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
64
Huang Ying152cef42011-07-13 13:14:26 +080065/* This is just an estimation for memory pool allocation */
66#define GHES_ESTATUS_CACHE_AVG_SIZE 512
67
68#define GHES_ESTATUS_CACHES_SIZE 4
69
Len Brown70cb6e12011-08-02 18:00:21 -040070#define GHES_ESTATUS_IN_CACHE_MAX_NSEC 10000000000ULL
Huang Ying152cef42011-07-13 13:14:26 +080071/* Prevent too many caches are allocated because of RCU */
72#define GHES_ESTATUS_CACHE_ALLOCED_MAX (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
73
74#define GHES_ESTATUS_CACHE_LEN(estatus_len) \
75 (sizeof(struct ghes_estatus_cache) + (estatus_len))
76#define GHES_ESTATUS_FROM_CACHE(estatus_cache) \
Lv Zheng0a00fd52014-06-03 16:32:53 +080077 ((struct acpi_hest_generic_status *) \
Huang Ying152cef42011-07-13 13:14:26 +080078 ((struct ghes_estatus_cache *)(estatus_cache) + 1))
79
Huang Ying67eb2e92011-07-13 13:14:25 +080080#define GHES_ESTATUS_NODE_LEN(estatus_len) \
81 (sizeof(struct ghes_estatus_node) + (estatus_len))
Chen, Gong88f074f2013-10-18 14:28:59 -070082#define GHES_ESTATUS_FROM_NODE(estatus_node) \
Lv Zheng0a00fd52014-06-03 16:32:53 +080083 ((struct acpi_hest_generic_status *) \
Huang Ying67eb2e92011-07-13 13:14:25 +080084 ((struct ghes_estatus_node *)(estatus_node) + 1))
Huang Yingd334a492010-05-18 14:35:20 +080085
Rusty Russell90ab5ee2012-01-13 09:32:20 +103086bool ghes_disable;
Huang Yingb6a95012011-07-13 13:14:19 +080087module_param_named(disable, ghes_disable, bool, 0);
88
Huang Yingd334a492010-05-18 14:35:20 +080089/*
Huang Ying81e88fd2011-01-12 14:44:55 +080090 * All error sources notified with SCI shares one notifier function,
91 * so they need to be linked and checked one by one. This is applied
92 * to NMI too.
Huang Yingd334a492010-05-18 14:35:20 +080093 *
Huang Ying81e88fd2011-01-12 14:44:55 +080094 * RCU is used for these lists, so ghes_list_mutex is only used for
95 * list changing, not for traversing.
Huang Yingd334a492010-05-18 14:35:20 +080096 */
97static LIST_HEAD(ghes_sci);
Huang Ying7ad6e942010-08-02 15:48:24 +080098static DEFINE_MUTEX(ghes_list_mutex);
Huang Yingd334a492010-05-18 14:35:20 +080099
Huang Ying81e88fd2011-01-12 14:44:55 +0800100/*
Huang Ying81e88fd2011-01-12 14:44:55 +0800101 * 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/*
Tomasz Nowicki594c7252014-07-22 11:20:13 +0200108 * Two virtual pages are used, one for IRQ/PROCESS context, the other for
109 * NMI context (optionally).
Huang Ying81e88fd2011-01-12 14:44:55 +0800110 */
Tomasz Nowicki594c7252014-07-22 11:20:13 +0200111#ifdef CONFIG_HAVE_ACPI_APEI_NMI
112#define GHES_IOREMAP_PAGES 2
113#else
114#define GHES_IOREMAP_PAGES 1
115#endif
116#define GHES_IOREMAP_IRQ_PAGE(base) (base)
117#define GHES_IOREMAP_NMI_PAGE(base) ((base) + PAGE_SIZE)
Huang Ying81e88fd2011-01-12 14:44:55 +0800118
119/* virtual memory area for atomic ioremap */
120static struct vm_struct *ghes_ioremap_area;
121/*
122 * These 2 spinlock is used to prevent atomic ioremap virtual memory
123 * area from being mapped simultaneously.
124 */
125static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi);
126static DEFINE_SPINLOCK(ghes_ioremap_lock_irq);
127
Huang Ying67eb2e92011-07-13 13:14:25 +0800128static struct gen_pool *ghes_estatus_pool;
129static unsigned long ghes_estatus_pool_size_request;
Huang Ying67eb2e92011-07-13 13:14:25 +0800130
Borislav Petkov8f7c31f2014-09-29 13:33:17 +0200131static struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
Huang Ying152cef42011-07-13 13:14:26 +0800132static atomic_t ghes_estatus_cache_alloced;
133
Huang Ying81e88fd2011-01-12 14:44:55 +0800134static int ghes_ioremap_init(void)
135{
136 ghes_ioremap_area = __get_vm_area(PAGE_SIZE * GHES_IOREMAP_PAGES,
137 VM_IOREMAP, VMALLOC_START, VMALLOC_END);
138 if (!ghes_ioremap_area) {
139 pr_err(GHES_PFX "Failed to allocate virtual memory area for atomic ioremap.\n");
140 return -ENOMEM;
141 }
142
143 return 0;
144}
145
146static void ghes_ioremap_exit(void)
147{
148 free_vm_area(ghes_ioremap_area);
149}
150
151static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
152{
153 unsigned long vaddr;
154
155 vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr);
156 ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
157 pfn << PAGE_SHIFT, PAGE_KERNEL);
158
159 return (void __iomem *)vaddr;
160}
161
162static void __iomem *ghes_ioremap_pfn_irq(u64 pfn)
163{
164 unsigned long vaddr;
165
166 vaddr = (unsigned long)GHES_IOREMAP_IRQ_PAGE(ghes_ioremap_area->addr);
167 ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
168 pfn << PAGE_SHIFT, PAGE_KERNEL);
169
170 return (void __iomem *)vaddr;
171}
172
173static void ghes_iounmap_nmi(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_NMI_PAGE(base));
179 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
Tomasz Nowicki594c7252014-07-22 11:20:13 +0200180 arch_apei_flush_tlb_one(vaddr);
Huang Ying81e88fd2011-01-12 14:44:55 +0800181}
182
183static void ghes_iounmap_irq(void __iomem *vaddr_ptr)
184{
185 unsigned long vaddr = (unsigned long __force)vaddr_ptr;
186 void *base = ghes_ioremap_area->addr;
187
188 BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_IRQ_PAGE(base));
189 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
Tomasz Nowicki594c7252014-07-22 11:20:13 +0200190 arch_apei_flush_tlb_one(vaddr);
Huang Ying81e88fd2011-01-12 14:44:55 +0800191}
192
Huang Ying67eb2e92011-07-13 13:14:25 +0800193static int ghes_estatus_pool_init(void)
194{
195 ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
196 if (!ghes_estatus_pool)
197 return -ENOMEM;
198 return 0;
199}
200
201static void ghes_estatus_pool_free_chunk_page(struct gen_pool *pool,
202 struct gen_pool_chunk *chunk,
203 void *data)
204{
205 free_page(chunk->start_addr);
206}
207
208static void ghes_estatus_pool_exit(void)
209{
210 gen_pool_for_each_chunk(ghes_estatus_pool,
211 ghes_estatus_pool_free_chunk_page, NULL);
212 gen_pool_destroy(ghes_estatus_pool);
213}
214
215static int ghes_estatus_pool_expand(unsigned long len)
216{
217 unsigned long i, pages, size, addr;
218 int ret;
219
220 ghes_estatus_pool_size_request += PAGE_ALIGN(len);
221 size = gen_pool_size(ghes_estatus_pool);
222 if (size >= ghes_estatus_pool_size_request)
223 return 0;
224 pages = (ghes_estatus_pool_size_request - size) / PAGE_SIZE;
225 for (i = 0; i < pages; i++) {
226 addr = __get_free_page(GFP_KERNEL);
227 if (!addr)
228 return -ENOMEM;
229 ret = gen_pool_add(ghes_estatus_pool, addr, PAGE_SIZE, -1);
230 if (ret)
231 return ret;
232 }
233
234 return 0;
235}
236
Huang Yingd334a492010-05-18 14:35:20 +0800237static struct ghes *ghes_new(struct acpi_hest_generic *generic)
238{
239 struct ghes *ghes;
240 unsigned int error_block_length;
241 int rc;
242
243 ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
244 if (!ghes)
245 return ERR_PTR(-ENOMEM);
246 ghes->generic = generic;
Huang Ying34ddeb02012-06-12 11:20:19 +0800247 rc = apei_map_generic_address(&generic->error_status_address);
Huang Yingd334a492010-05-18 14:35:20 +0800248 if (rc)
249 goto err_free;
250 error_block_length = generic->error_block_length;
251 if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
252 pr_warning(FW_WARN GHES_PFX
253 "Error status block length is too long: %u for "
254 "generic hardware error source: %d.\n",
255 error_block_length, generic->header.source_id);
256 error_block_length = GHES_ESTATUS_MAX_SIZE;
257 }
258 ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
259 if (!ghes->estatus) {
260 rc = -ENOMEM;
261 goto err_unmap;
262 }
263
264 return ghes;
265
266err_unmap:
Huang Ying34ddeb02012-06-12 11:20:19 +0800267 apei_unmap_generic_address(&generic->error_status_address);
Huang Yingd334a492010-05-18 14:35:20 +0800268err_free:
269 kfree(ghes);
270 return ERR_PTR(rc);
271}
272
273static void ghes_fini(struct ghes *ghes)
274{
275 kfree(ghes->estatus);
Huang Ying34ddeb02012-06-12 11:20:19 +0800276 apei_unmap_generic_address(&ghes->generic->error_status_address);
Huang Yingd334a492010-05-18 14:35:20 +0800277}
278
Huang Yingd334a492010-05-18 14:35:20 +0800279static inline int ghes_severity(int severity)
280{
281 switch (severity) {
Huang Yingad4ecef2010-08-02 15:48:23 +0800282 case CPER_SEV_INFORMATIONAL:
283 return GHES_SEV_NO;
284 case CPER_SEV_CORRECTED:
285 return GHES_SEV_CORRECTED;
286 case CPER_SEV_RECOVERABLE:
287 return GHES_SEV_RECOVERABLE;
288 case CPER_SEV_FATAL:
289 return GHES_SEV_PANIC;
Huang Yingd334a492010-05-18 14:35:20 +0800290 default:
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300291 /* Unknown, go panic */
Huang Yingad4ecef2010-08-02 15:48:23 +0800292 return GHES_SEV_PANIC;
Huang Yingd334a492010-05-18 14:35:20 +0800293 }
294}
295
Huang Ying81e88fd2011-01-12 14:44:55 +0800296static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
297 int from_phys)
Huang Yingd334a492010-05-18 14:35:20 +0800298{
Huang Ying81e88fd2011-01-12 14:44:55 +0800299 void __iomem *vaddr;
300 unsigned long flags = 0;
301 int in_nmi = in_nmi();
302 u64 offset;
303 u32 trunk;
Huang Yingd334a492010-05-18 14:35:20 +0800304
Huang Ying81e88fd2011-01-12 14:44:55 +0800305 while (len > 0) {
306 offset = paddr - (paddr & PAGE_MASK);
307 if (in_nmi) {
308 raw_spin_lock(&ghes_ioremap_lock_nmi);
309 vaddr = ghes_ioremap_pfn_nmi(paddr >> PAGE_SHIFT);
310 } else {
311 spin_lock_irqsave(&ghes_ioremap_lock_irq, flags);
312 vaddr = ghes_ioremap_pfn_irq(paddr >> PAGE_SHIFT);
313 }
314 trunk = PAGE_SIZE - offset;
315 trunk = min(trunk, len);
316 if (from_phys)
317 memcpy_fromio(buffer, vaddr + offset, trunk);
318 else
319 memcpy_toio(vaddr + offset, buffer, trunk);
320 len -= trunk;
321 paddr += trunk;
322 buffer += trunk;
323 if (in_nmi) {
324 ghes_iounmap_nmi(vaddr);
325 raw_spin_unlock(&ghes_ioremap_lock_nmi);
326 } else {
327 ghes_iounmap_irq(vaddr);
328 spin_unlock_irqrestore(&ghes_ioremap_lock_irq, flags);
329 }
330 }
Huang Yingd334a492010-05-18 14:35:20 +0800331}
332
333static int ghes_read_estatus(struct ghes *ghes, int silent)
334{
335 struct acpi_hest_generic *g = ghes->generic;
336 u64 buf_paddr;
337 u32 len;
338 int rc;
339
Myron Stowe700130b2011-11-07 16:23:41 -0700340 rc = apei_read(&buf_paddr, &g->error_status_address);
Huang Yingd334a492010-05-18 14:35:20 +0800341 if (rc) {
342 if (!silent && printk_ratelimit())
343 pr_warning(FW_WARN GHES_PFX
344"Failed to read error status block address for hardware error source: %d.\n",
345 g->header.source_id);
346 return -EIO;
347 }
348 if (!buf_paddr)
349 return -ENOENT;
350
Huang Ying81e88fd2011-01-12 14:44:55 +0800351 ghes_copy_tofrom_phys(ghes->estatus, buf_paddr,
352 sizeof(*ghes->estatus), 1);
Huang Yingd334a492010-05-18 14:35:20 +0800353 if (!ghes->estatus->block_status)
354 return -ENOENT;
355
356 ghes->buffer_paddr = buf_paddr;
357 ghes->flags |= GHES_TO_CLEAR;
358
359 rc = -EIO;
Chen, Gong88f074f2013-10-18 14:28:59 -0700360 len = cper_estatus_len(ghes->estatus);
Huang Yingd334a492010-05-18 14:35:20 +0800361 if (len < sizeof(*ghes->estatus))
362 goto err_read_block;
363 if (len > ghes->generic->error_block_length)
364 goto err_read_block;
Chen, Gong88f074f2013-10-18 14:28:59 -0700365 if (cper_estatus_check_header(ghes->estatus))
Huang Yingd334a492010-05-18 14:35:20 +0800366 goto err_read_block;
Huang Ying81e88fd2011-01-12 14:44:55 +0800367 ghes_copy_tofrom_phys(ghes->estatus + 1,
368 buf_paddr + sizeof(*ghes->estatus),
369 len - sizeof(*ghes->estatus), 1);
Chen, Gong88f074f2013-10-18 14:28:59 -0700370 if (cper_estatus_check(ghes->estatus))
Huang Yingd334a492010-05-18 14:35:20 +0800371 goto err_read_block;
372 rc = 0;
373
374err_read_block:
Huang Ying81e88fd2011-01-12 14:44:55 +0800375 if (rc && !silent && printk_ratelimit())
Huang Yingd334a492010-05-18 14:35:20 +0800376 pr_warning(FW_WARN GHES_PFX
377 "Failed to read error status block!\n");
378 return rc;
379}
380
381static void ghes_clear_estatus(struct ghes *ghes)
382{
383 ghes->estatus->block_status = 0;
384 if (!(ghes->flags & GHES_TO_CLEAR))
385 return;
386 ghes_copy_tofrom_phys(ghes->estatus, ghes->buffer_paddr,
387 sizeof(ghes->estatus->block_status), 0);
388 ghes->flags &= ~GHES_TO_CLEAR;
389}
390
Lv Zheng0a00fd52014-06-03 16:32:53 +0800391static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int sev)
Naveen N. Raocf870c72013-07-10 14:57:01 +0530392{
393#ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE
394 unsigned long pfn;
Chen, Gongca104ed2013-11-25 02:15:01 -0500395 int flags = -1;
Naveen N. Raocf870c72013-07-10 14:57:01 +0530396 int sec_sev = ghes_severity(gdata->error_severity);
397 struct cper_sec_mem_err *mem_err;
398 mem_err = (struct cper_sec_mem_err *)(gdata + 1);
399
Chen, Gongca104ed2013-11-25 02:15:01 -0500400 if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
401 return;
402
403 pfn = mem_err->physical_addr >> PAGE_SHIFT;
404 if (!pfn_valid(pfn)) {
405 pr_warn_ratelimited(FW_WARN GHES_PFX
406 "Invalid address in generic error data: %#llx\n",
407 mem_err->physical_addr);
408 return;
409 }
410
411 /* iff following two events can be handled properly by now */
Naveen N. Raocf870c72013-07-10 14:57:01 +0530412 if (sec_sev == GHES_SEV_CORRECTED &&
Chen, Gongca104ed2013-11-25 02:15:01 -0500413 (gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED))
414 flags = MF_SOFT_OFFLINE;
415 if (sev == GHES_SEV_RECOVERABLE && sec_sev == GHES_SEV_RECOVERABLE)
416 flags = 0;
417
418 if (flags != -1)
419 memory_failure_queue(pfn, 0, flags);
Naveen N. Raocf870c72013-07-10 14:57:01 +0530420#endif
421}
422
Mauro Carvalho Chehab21480542013-02-15 06:10:39 -0300423static void ghes_do_proc(struct ghes *ghes,
Lv Zheng0a00fd52014-06-03 16:32:53 +0800424 const struct acpi_hest_generic_status *estatus)
Huang Yingd334a492010-05-18 14:35:20 +0800425{
Huang Yingba61ca42011-07-13 13:14:28 +0800426 int sev, sec_sev;
Lv Zheng0a00fd52014-06-03 16:32:53 +0800427 struct acpi_hest_generic_data *gdata;
Huang Yingd334a492010-05-18 14:35:20 +0800428
Huang Ying67eb2e92011-07-13 13:14:25 +0800429 sev = ghes_severity(estatus->error_severity);
430 apei_estatus_for_each_section(estatus, gdata) {
Huang Yingba61ca42011-07-13 13:14:28 +0800431 sec_sev = ghes_severity(gdata->error_severity);
Huang Yingd334a492010-05-18 14:35:20 +0800432 if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
433 CPER_SEC_PLATFORM_MEM)) {
Huang Yingba61ca42011-07-13 13:14:28 +0800434 struct cper_sec_mem_err *mem_err;
435 mem_err = (struct cper_sec_mem_err *)(gdata+1);
Mauro Carvalho Chehab21480542013-02-15 06:10:39 -0300436 ghes_edac_report_mem_error(ghes, sev, mem_err);
437
Tomasz Nowicki9dae3d02014-07-22 11:20:11 +0200438 arch_apei_report_mem_error(sev, mem_err);
Naveen N. Raocf870c72013-07-10 14:57:01 +0530439 ghes_handle_memory_failure(gdata, sev);
Huang Yingba61ca42011-07-13 13:14:28 +0800440 }
Huang Yinga654e5e2011-12-08 11:25:41 +0800441#ifdef CONFIG_ACPI_APEI_PCIEAER
442 else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
443 CPER_SEC_PCIE)) {
444 struct cper_sec_pcie *pcie_err;
445 pcie_err = (struct cper_sec_pcie *)(gdata+1);
446 if (sev == GHES_SEV_RECOVERABLE &&
447 sec_sev == GHES_SEV_RECOVERABLE &&
448 pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
449 pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
450 unsigned int devfn;
451 int aer_severity;
Betty Dall0ba98ec2013-06-06 12:10:50 -0600452
Huang Yinga654e5e2011-12-08 11:25:41 +0800453 devfn = PCI_DEVFN(pcie_err->device_id.device,
454 pcie_err->device_id.function);
455 aer_severity = cper_severity_to_aer(sev);
Betty Dall0ba98ec2013-06-06 12:10:50 -0600456
457 /*
458 * If firmware reset the component to contain
459 * the error, we must reinitialize it before
460 * use, so treat it as a fatal AER error.
461 */
462 if (gdata->flags & CPER_SEC_RESET)
463 aer_severity = AER_FATAL;
464
Huang Yinga654e5e2011-12-08 11:25:41 +0800465 aer_recover_queue(pcie_err->device_id.segment,
466 pcie_err->device_id.bus,
Lance Ortiz37448ad2013-05-30 08:25:12 -0600467 devfn, aer_severity,
468 (struct aer_capability_regs *)
469 pcie_err->aer_info);
Huang Yinga654e5e2011-12-08 11:25:41 +0800470 }
471
472 }
473#endif
Huang Yingd334a492010-05-18 14:35:20 +0800474 }
Huang Ying32c361f2010-12-07 10:22:31 +0800475}
Huang Yingd334a492010-05-18 14:35:20 +0800476
Huang Ying67eb2e92011-07-13 13:14:25 +0800477static void __ghes_print_estatus(const char *pfx,
478 const struct acpi_hest_generic *generic,
Lv Zheng0a00fd52014-06-03 16:32:53 +0800479 const struct acpi_hest_generic_status *estatus)
Huang Ying32c361f2010-12-07 10:22:31 +0800480{
Huang Ying5ba82ab2011-12-08 11:25:44 +0800481 static atomic_t seqno;
482 unsigned int curr_seqno;
483 char pfx_seq[64];
484
Huang Ying32c361f2010-12-07 10:22:31 +0800485 if (pfx == NULL) {
Huang Ying67eb2e92011-07-13 13:14:25 +0800486 if (ghes_severity(estatus->error_severity) <=
Huang Ying32c361f2010-12-07 10:22:31 +0800487 GHES_SEV_CORRECTED)
Huang Ying5ba82ab2011-12-08 11:25:44 +0800488 pfx = KERN_WARNING;
Huang Ying32c361f2010-12-07 10:22:31 +0800489 else
Huang Ying5ba82ab2011-12-08 11:25:44 +0800490 pfx = KERN_ERR;
Huang Ying32c361f2010-12-07 10:22:31 +0800491 }
Huang Ying5ba82ab2011-12-08 11:25:44 +0800492 curr_seqno = atomic_inc_return(&seqno);
493 snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}" HW_ERR, pfx, curr_seqno);
Huang Ying55883402011-07-13 13:14:15 +0800494 printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
Huang Ying5ba82ab2011-12-08 11:25:44 +0800495 pfx_seq, generic->header.source_id);
Chen, Gong88f074f2013-10-18 14:28:59 -0700496 cper_estatus_print(pfx_seq, estatus);
Huang Ying55883402011-07-13 13:14:15 +0800497}
498
Huang Ying152cef42011-07-13 13:14:26 +0800499static int ghes_print_estatus(const char *pfx,
500 const struct acpi_hest_generic *generic,
Lv Zheng0a00fd52014-06-03 16:32:53 +0800501 const struct acpi_hest_generic_status *estatus)
Huang Ying55883402011-07-13 13:14:15 +0800502{
503 /* Not more than 2 messages every 5 seconds */
Huang Ying67eb2e92011-07-13 13:14:25 +0800504 static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
505 static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
506 struct ratelimit_state *ratelimit;
Huang Ying55883402011-07-13 13:14:15 +0800507
Huang Ying67eb2e92011-07-13 13:14:25 +0800508 if (ghes_severity(estatus->error_severity) <= GHES_SEV_CORRECTED)
509 ratelimit = &ratelimit_corrected;
510 else
511 ratelimit = &ratelimit_uncorrected;
Huang Ying152cef42011-07-13 13:14:26 +0800512 if (__ratelimit(ratelimit)) {
Huang Ying67eb2e92011-07-13 13:14:25 +0800513 __ghes_print_estatus(pfx, generic, estatus);
Huang Ying152cef42011-07-13 13:14:26 +0800514 return 1;
515 }
516 return 0;
517}
518
519/*
520 * GHES error status reporting throttle, to report more kinds of
521 * errors, instead of just most frequently occurred errors.
522 */
Lv Zheng0a00fd52014-06-03 16:32:53 +0800523static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
Huang Ying152cef42011-07-13 13:14:26 +0800524{
525 u32 len;
526 int i, cached = 0;
527 unsigned long long now;
528 struct ghes_estatus_cache *cache;
Lv Zheng0a00fd52014-06-03 16:32:53 +0800529 struct acpi_hest_generic_status *cache_estatus;
Huang Ying152cef42011-07-13 13:14:26 +0800530
Chen, Gong88f074f2013-10-18 14:28:59 -0700531 len = cper_estatus_len(estatus);
Huang Ying152cef42011-07-13 13:14:26 +0800532 rcu_read_lock();
533 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
534 cache = rcu_dereference(ghes_estatus_caches[i]);
535 if (cache == NULL)
536 continue;
537 if (len != cache->estatus_len)
538 continue;
539 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
540 if (memcmp(estatus, cache_estatus, len))
541 continue;
542 atomic_inc(&cache->count);
543 now = sched_clock();
544 if (now - cache->time_in < GHES_ESTATUS_IN_CACHE_MAX_NSEC)
545 cached = 1;
546 break;
547 }
548 rcu_read_unlock();
549 return cached;
550}
551
552static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
553 struct acpi_hest_generic *generic,
Lv Zheng0a00fd52014-06-03 16:32:53 +0800554 struct acpi_hest_generic_status *estatus)
Huang Ying152cef42011-07-13 13:14:26 +0800555{
556 int alloced;
557 u32 len, cache_len;
558 struct ghes_estatus_cache *cache;
Lv Zheng0a00fd52014-06-03 16:32:53 +0800559 struct acpi_hest_generic_status *cache_estatus;
Huang Ying152cef42011-07-13 13:14:26 +0800560
561 alloced = atomic_add_return(1, &ghes_estatus_cache_alloced);
562 if (alloced > GHES_ESTATUS_CACHE_ALLOCED_MAX) {
563 atomic_dec(&ghes_estatus_cache_alloced);
564 return NULL;
565 }
Chen, Gong88f074f2013-10-18 14:28:59 -0700566 len = cper_estatus_len(estatus);
Huang Ying152cef42011-07-13 13:14:26 +0800567 cache_len = GHES_ESTATUS_CACHE_LEN(len);
568 cache = (void *)gen_pool_alloc(ghes_estatus_pool, cache_len);
569 if (!cache) {
570 atomic_dec(&ghes_estatus_cache_alloced);
571 return NULL;
572 }
573 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
574 memcpy(cache_estatus, estatus, len);
575 cache->estatus_len = len;
576 atomic_set(&cache->count, 0);
577 cache->generic = generic;
578 cache->time_in = sched_clock();
579 return cache;
580}
581
582static void ghes_estatus_cache_free(struct ghes_estatus_cache *cache)
583{
584 u32 len;
585
Chen, Gong88f074f2013-10-18 14:28:59 -0700586 len = cper_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
Huang Ying152cef42011-07-13 13:14:26 +0800587 len = GHES_ESTATUS_CACHE_LEN(len);
588 gen_pool_free(ghes_estatus_pool, (unsigned long)cache, len);
589 atomic_dec(&ghes_estatus_cache_alloced);
590}
591
592static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
593{
594 struct ghes_estatus_cache *cache;
595
596 cache = container_of(head, struct ghes_estatus_cache, rcu);
597 ghes_estatus_cache_free(cache);
598}
599
600static void ghes_estatus_cache_add(
601 struct acpi_hest_generic *generic,
Lv Zheng0a00fd52014-06-03 16:32:53 +0800602 struct acpi_hest_generic_status *estatus)
Huang Ying152cef42011-07-13 13:14:26 +0800603{
604 int i, slot = -1, count;
605 unsigned long long now, duration, period, max_period = 0;
606 struct ghes_estatus_cache *cache, *slot_cache = NULL, *new_cache;
607
608 new_cache = ghes_estatus_cache_alloc(generic, estatus);
609 if (new_cache == NULL)
610 return;
611 rcu_read_lock();
612 now = sched_clock();
613 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
614 cache = rcu_dereference(ghes_estatus_caches[i]);
615 if (cache == NULL) {
616 slot = i;
617 slot_cache = NULL;
618 break;
619 }
620 duration = now - cache->time_in;
621 if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
622 slot = i;
623 slot_cache = cache;
624 break;
625 }
626 count = atomic_read(&cache->count);
Len Brown70cb6e12011-08-02 18:00:21 -0400627 period = duration;
628 do_div(period, (count + 1));
Huang Ying152cef42011-07-13 13:14:26 +0800629 if (period > max_period) {
630 max_period = period;
631 slot = i;
632 slot_cache = cache;
633 }
634 }
635 /* new_cache must be put into array after its contents are written */
636 smp_wmb();
637 if (slot != -1 && cmpxchg(ghes_estatus_caches + slot,
638 slot_cache, new_cache) == slot_cache) {
639 if (slot_cache)
640 call_rcu(&slot_cache->rcu, ghes_estatus_cache_rcu_free);
641 } else
642 ghes_estatus_cache_free(new_cache);
643 rcu_read_unlock();
Huang Yingd334a492010-05-18 14:35:20 +0800644}
645
646static int ghes_proc(struct ghes *ghes)
647{
648 int rc;
649
650 rc = ghes_read_estatus(ghes, 0);
651 if (rc)
652 goto out;
Huang Ying152cef42011-07-13 13:14:26 +0800653 if (!ghes_estatus_cached(ghes->estatus)) {
654 if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
655 ghes_estatus_cache_add(ghes->generic, ghes->estatus);
656 }
Mauro Carvalho Chehab21480542013-02-15 06:10:39 -0300657 ghes_do_proc(ghes, ghes->estatus);
Huang Yingd334a492010-05-18 14:35:20 +0800658out:
659 ghes_clear_estatus(ghes);
660 return 0;
661}
662
Huang Ying81e88fd2011-01-12 14:44:55 +0800663static void ghes_add_timer(struct ghes *ghes)
664{
665 struct acpi_hest_generic *g = ghes->generic;
666 unsigned long expire;
667
668 if (!g->notify.poll_interval) {
669 pr_warning(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n",
670 g->header.source_id);
671 return;
672 }
673 expire = jiffies + msecs_to_jiffies(g->notify.poll_interval);
674 ghes->timer.expires = round_jiffies_relative(expire);
675 add_timer(&ghes->timer);
676}
677
678static void ghes_poll_func(unsigned long data)
679{
680 struct ghes *ghes = (void *)data;
681
682 ghes_proc(ghes);
683 if (!(ghes->flags & GHES_EXITING))
684 ghes_add_timer(ghes);
685}
686
687static irqreturn_t ghes_irq_func(int irq, void *data)
688{
689 struct ghes *ghes = data;
690 int rc;
691
692 rc = ghes_proc(ghes);
693 if (rc)
694 return IRQ_NONE;
695
696 return IRQ_HANDLED;
697}
698
Huang Yingd334a492010-05-18 14:35:20 +0800699static int ghes_notify_sci(struct notifier_block *this,
700 unsigned long event, void *data)
701{
702 struct ghes *ghes;
703 int ret = NOTIFY_DONE;
704
705 rcu_read_lock();
706 list_for_each_entry_rcu(ghes, &ghes_sci, list) {
707 if (!ghes_proc(ghes))
708 ret = NOTIFY_OK;
709 }
710 rcu_read_unlock();
711
712 return ret;
713}
714
Tomasz Nowicki44a69f62014-07-22 11:20:12 +0200715static struct notifier_block ghes_notifier_sci = {
716 .notifier_call = ghes_notify_sci,
717};
718
719#ifdef CONFIG_HAVE_ACPI_APEI_NMI
720/*
721 * printk is not safe in NMI context. So in NMI handler, we allocate
722 * required memory from lock-less memory allocator
723 * (ghes_estatus_pool), save estatus into it, put them into lock-less
724 * list (ghes_estatus_llist), then delay printk into IRQ context via
725 * irq_work (ghes_proc_irq_work). ghes_estatus_size_request record
726 * required pool size by all NMI error source.
727 */
728static struct llist_head ghes_estatus_llist;
729static struct irq_work ghes_proc_irq_work;
730
731/*
732 * NMI may be triggered on any CPU, so ghes_nmi_lock is used for
733 * mutual exclusion.
734 */
735static DEFINE_RAW_SPINLOCK(ghes_nmi_lock);
736
737static LIST_HEAD(ghes_nmi);
738
739static int ghes_panic_timeout __read_mostly = 30;
740
Huang Ying46d12f02011-12-08 11:25:45 +0800741static void ghes_proc_in_irq(struct irq_work *irq_work)
742{
743 struct llist_node *llnode, *next;
744 struct ghes_estatus_node *estatus_node;
745 struct acpi_hest_generic *generic;
Lv Zheng0a00fd52014-06-03 16:32:53 +0800746 struct acpi_hest_generic_status *estatus;
Huang Ying46d12f02011-12-08 11:25:45 +0800747 u32 len, node_len;
748
749 llnode = llist_del_all(&ghes_estatus_llist);
750 /*
751 * Because the time order of estatus in list is reversed,
752 * revert it back to proper order.
753 */
Chen, Gong8d21d4c2014-07-28 02:50:59 -0400754 llnode = llist_reverse_order(llnode);
Huang Ying67eb2e92011-07-13 13:14:25 +0800755 while (llnode) {
756 next = llnode->next;
757 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
758 llnode);
759 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
Chen, Gong88f074f2013-10-18 14:28:59 -0700760 len = cper_estatus_len(estatus);
Huang Ying67eb2e92011-07-13 13:14:25 +0800761 node_len = GHES_ESTATUS_NODE_LEN(len);
Mauro Carvalho Chehab21480542013-02-15 06:10:39 -0300762 ghes_do_proc(estatus_node->ghes, estatus);
Huang Ying152cef42011-07-13 13:14:26 +0800763 if (!ghes_estatus_cached(estatus)) {
764 generic = estatus_node->generic;
765 if (ghes_print_estatus(NULL, generic, estatus))
766 ghes_estatus_cache_add(generic, estatus);
767 }
Huang Ying67eb2e92011-07-13 13:14:25 +0800768 gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
769 node_len);
770 llnode = next;
771 }
772}
773
Huang Ying46d12f02011-12-08 11:25:45 +0800774static void ghes_print_queued_estatus(void)
775{
776 struct llist_node *llnode;
777 struct ghes_estatus_node *estatus_node;
778 struct acpi_hest_generic *generic;
Lv Zheng0a00fd52014-06-03 16:32:53 +0800779 struct acpi_hest_generic_status *estatus;
Huang Ying46d12f02011-12-08 11:25:45 +0800780 u32 len, node_len;
781
782 llnode = llist_del_all(&ghes_estatus_llist);
783 /*
784 * Because the time order of estatus in list is reversed,
785 * revert it back to proper order.
786 */
Chen, Gong8d21d4c2014-07-28 02:50:59 -0400787 llnode = llist_reverse_order(llnode);
Huang Ying46d12f02011-12-08 11:25:45 +0800788 while (llnode) {
789 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
790 llnode);
791 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
Chen, Gong88f074f2013-10-18 14:28:59 -0700792 len = cper_estatus_len(estatus);
Huang Ying46d12f02011-12-08 11:25:45 +0800793 node_len = GHES_ESTATUS_NODE_LEN(len);
794 generic = estatus_node->generic;
795 ghes_print_estatus(NULL, generic, estatus);
796 llnode = llnode->next;
797 }
798}
799
Don Zickus9c48f1c2011-09-30 15:06:21 -0400800static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
Huang Ying81e88fd2011-01-12 14:44:55 +0800801{
802 struct ghes *ghes, *ghes_global = NULL;
803 int sev, sev_global = -1;
Don Zickus9c48f1c2011-09-30 15:06:21 -0400804 int ret = NMI_DONE;
Huang Ying81e88fd2011-01-12 14:44:55 +0800805
806 raw_spin_lock(&ghes_nmi_lock);
807 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
808 if (ghes_read_estatus(ghes, 1)) {
809 ghes_clear_estatus(ghes);
810 continue;
811 }
812 sev = ghes_severity(ghes->estatus->error_severity);
813 if (sev > sev_global) {
814 sev_global = sev;
815 ghes_global = ghes;
816 }
Don Zickus9c48f1c2011-09-30 15:06:21 -0400817 ret = NMI_HANDLED;
Huang Ying81e88fd2011-01-12 14:44:55 +0800818 }
819
Don Zickus9c48f1c2011-09-30 15:06:21 -0400820 if (ret == NMI_DONE)
Huang Ying81e88fd2011-01-12 14:44:55 +0800821 goto out;
822
823 if (sev_global >= GHES_SEV_PANIC) {
824 oops_begin();
Huang Ying46d12f02011-12-08 11:25:45 +0800825 ghes_print_queued_estatus();
Huang Ying5ba82ab2011-12-08 11:25:44 +0800826 __ghes_print_estatus(KERN_EMERG, ghes_global->generic,
Huang Ying67eb2e92011-07-13 13:14:25 +0800827 ghes_global->estatus);
Huang Ying81e88fd2011-01-12 14:44:55 +0800828 /* reboot to log the error! */
829 if (panic_timeout == 0)
830 panic_timeout = ghes_panic_timeout;
831 panic("Fatal hardware error!");
832 }
833
834 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
Huang Ying67eb2e92011-07-13 13:14:25 +0800835#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
836 u32 len, node_len;
837 struct ghes_estatus_node *estatus_node;
Lv Zheng0a00fd52014-06-03 16:32:53 +0800838 struct acpi_hest_generic_status *estatus;
Huang Ying67eb2e92011-07-13 13:14:25 +0800839#endif
Huang Ying81e88fd2011-01-12 14:44:55 +0800840 if (!(ghes->flags & GHES_TO_CLEAR))
841 continue;
Huang Ying67eb2e92011-07-13 13:14:25 +0800842#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
Huang Ying152cef42011-07-13 13:14:26 +0800843 if (ghes_estatus_cached(ghes->estatus))
844 goto next;
Huang Ying67eb2e92011-07-13 13:14:25 +0800845 /* Save estatus for further processing in IRQ context */
Chen, Gong88f074f2013-10-18 14:28:59 -0700846 len = cper_estatus_len(ghes->estatus);
Huang Ying67eb2e92011-07-13 13:14:25 +0800847 node_len = GHES_ESTATUS_NODE_LEN(len);
848 estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool,
849 node_len);
850 if (estatus_node) {
Mauro Carvalho Chehab21480542013-02-15 06:10:39 -0300851 estatus_node->ghes = ghes;
Huang Ying67eb2e92011-07-13 13:14:25 +0800852 estatus_node->generic = ghes->generic;
853 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
854 memcpy(estatus, ghes->estatus, len);
855 llist_add(&estatus_node->llnode, &ghes_estatus_llist);
856 }
Huang Ying152cef42011-07-13 13:14:26 +0800857next:
Huang Ying67eb2e92011-07-13 13:14:25 +0800858#endif
Huang Ying81e88fd2011-01-12 14:44:55 +0800859 ghes_clear_estatus(ghes);
860 }
Huang Ying67eb2e92011-07-13 13:14:25 +0800861#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
862 irq_work_queue(&ghes_proc_irq_work);
863#endif
Huang Ying81e88fd2011-01-12 14:44:55 +0800864
865out:
866 raw_spin_unlock(&ghes_nmi_lock);
867 return ret;
868}
869
Huang Ying67eb2e92011-07-13 13:14:25 +0800870static unsigned long ghes_esource_prealloc_size(
871 const struct acpi_hest_generic *generic)
872{
873 unsigned long block_length, prealloc_records, prealloc_size;
874
875 block_length = min_t(unsigned long, generic->error_block_length,
876 GHES_ESTATUS_MAX_SIZE);
877 prealloc_records = max_t(unsigned long,
878 generic->records_to_preallocate, 1);
879 prealloc_size = min_t(unsigned long, block_length * prealloc_records,
880 GHES_ESOURCE_PREALLOC_MAX_SIZE);
881
882 return prealloc_size;
883}
884
Tomasz Nowicki44a69f62014-07-22 11:20:12 +0200885static void ghes_estatus_pool_shrink(unsigned long len)
886{
887 ghes_estatus_pool_size_request -= PAGE_ALIGN(len);
888}
889
890static void ghes_nmi_add(struct ghes *ghes)
891{
892 unsigned long len;
893
894 len = ghes_esource_prealloc_size(ghes->generic);
895 ghes_estatus_pool_expand(len);
896 mutex_lock(&ghes_list_mutex);
897 if (list_empty(&ghes_nmi))
898 register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0, "ghes");
899 list_add_rcu(&ghes->list, &ghes_nmi);
900 mutex_unlock(&ghes_list_mutex);
901}
902
903static void ghes_nmi_remove(struct ghes *ghes)
904{
905 unsigned long len;
906
907 mutex_lock(&ghes_list_mutex);
908 list_del_rcu(&ghes->list);
909 if (list_empty(&ghes_nmi))
910 unregister_nmi_handler(NMI_LOCAL, "ghes");
911 mutex_unlock(&ghes_list_mutex);
912 /*
913 * To synchronize with NMI handler, ghes can only be
914 * freed after NMI handler finishes.
915 */
916 synchronize_rcu();
917 len = ghes_esource_prealloc_size(ghes->generic);
918 ghes_estatus_pool_shrink(len);
919}
920
921static void ghes_nmi_init_cxt(void)
922{
923 init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
924}
925#else /* CONFIG_HAVE_ACPI_APEI_NMI */
926static inline void ghes_nmi_add(struct ghes *ghes)
927{
928 pr_err(GHES_PFX "ID: %d, trying to add NMI notification which is not supported!\n",
929 ghes->generic->header.source_id);
930 BUG();
931}
932
933static inline void ghes_nmi_remove(struct ghes *ghes)
934{
935 pr_err(GHES_PFX "ID: %d, trying to remove NMI notification which is not supported!\n",
936 ghes->generic->header.source_id);
937 BUG();
938}
939
940static inline void ghes_nmi_init_cxt(void)
941{
942}
943#endif /* CONFIG_HAVE_ACPI_APEI_NMI */
944
Bill Pembertonda095fd2012-11-19 13:22:46 -0500945static int ghes_probe(struct platform_device *ghes_dev)
Huang Yingd334a492010-05-18 14:35:20 +0800946{
947 struct acpi_hest_generic *generic;
948 struct ghes *ghes = NULL;
Tomasz Nowicki44a69f62014-07-22 11:20:12 +0200949
Huang Ying7ad6e942010-08-02 15:48:24 +0800950 int rc = -EINVAL;
Huang Yingd334a492010-05-18 14:35:20 +0800951
Jin Dongming1dd6b202010-09-29 19:53:53 +0800952 generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
Huang Yingd334a492010-05-18 14:35:20 +0800953 if (!generic->enabled)
Huang Ying7ad6e942010-08-02 15:48:24 +0800954 return -ENODEV;
Huang Yingd334a492010-05-18 14:35:20 +0800955
Huang Ying81e88fd2011-01-12 14:44:55 +0800956 switch (generic->notify.type) {
957 case ACPI_HEST_NOTIFY_POLLED:
958 case ACPI_HEST_NOTIFY_EXTERNAL:
959 case ACPI_HEST_NOTIFY_SCI:
Tomasz Nowicki44a69f62014-07-22 11:20:12 +0200960 break;
Huang Ying81e88fd2011-01-12 14:44:55 +0800961 case ACPI_HEST_NOTIFY_NMI:
Tomasz Nowicki44a69f62014-07-22 11:20:12 +0200962 if (!IS_ENABLED(CONFIG_HAVE_ACPI_APEI_NMI)) {
963 pr_warn(GHES_PFX "Generic hardware error source: %d notified via NMI interrupt is not supported!\n",
964 generic->header.source_id);
965 goto err;
966 }
Huang Ying81e88fd2011-01-12 14:44:55 +0800967 break;
968 case ACPI_HEST_NOTIFY_LOCAL:
969 pr_warning(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
Huang Yingd334a492010-05-18 14:35:20 +0800970 generic->header.source_id);
971 goto err;
Huang Ying81e88fd2011-01-12 14:44:55 +0800972 default:
973 pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
974 generic->notify.type, generic->header.source_id);
975 goto err;
Huang Yingd334a492010-05-18 14:35:20 +0800976 }
Huang Ying81e88fd2011-01-12 14:44:55 +0800977
978 rc = -EIO;
979 if (generic->error_block_length <
Lv Zheng0a00fd52014-06-03 16:32:53 +0800980 sizeof(struct acpi_hest_generic_status)) {
Huang Ying81e88fd2011-01-12 14:44:55 +0800981 pr_warning(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
982 generic->error_block_length,
Huang Yingd334a492010-05-18 14:35:20 +0800983 generic->header.source_id);
984 goto err;
985 }
986 ghes = ghes_new(generic);
987 if (IS_ERR(ghes)) {
988 rc = PTR_ERR(ghes);
989 ghes = NULL;
990 goto err;
991 }
Mauro Carvalho Chehab21480542013-02-15 06:10:39 -0300992
993 rc = ghes_edac_register(ghes, &ghes_dev->dev);
994 if (rc < 0)
995 goto err;
996
Huang Ying81e88fd2011-01-12 14:44:55 +0800997 switch (generic->notify.type) {
998 case ACPI_HEST_NOTIFY_POLLED:
999 ghes->timer.function = ghes_poll_func;
1000 ghes->timer.data = (unsigned long)ghes;
1001 init_timer_deferrable(&ghes->timer);
1002 ghes_add_timer(ghes);
1003 break;
1004 case ACPI_HEST_NOTIFY_EXTERNAL:
1005 /* External interrupt vector is GSI */
Wei Yongjuna98d4f62013-06-03 02:08:39 +00001006 rc = acpi_gsi_to_irq(generic->notify.vector, &ghes->irq);
1007 if (rc) {
Huang Ying81e88fd2011-01-12 14:44:55 +08001008 pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
1009 generic->header.source_id);
Mauro Carvalho Chehab21480542013-02-15 06:10:39 -03001010 goto err_edac_unreg;
Huang Ying81e88fd2011-01-12 14:44:55 +08001011 }
Wei Yongjuna98d4f62013-06-03 02:08:39 +00001012 rc = request_irq(ghes->irq, ghes_irq_func, 0, "GHES IRQ", ghes);
1013 if (rc) {
Huang Ying81e88fd2011-01-12 14:44:55 +08001014 pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
1015 generic->header.source_id);
Mauro Carvalho Chehab21480542013-02-15 06:10:39 -03001016 goto err_edac_unreg;
Huang Ying81e88fd2011-01-12 14:44:55 +08001017 }
1018 break;
1019 case ACPI_HEST_NOTIFY_SCI:
Huang Ying7ad6e942010-08-02 15:48:24 +08001020 mutex_lock(&ghes_list_mutex);
Huang Yingd334a492010-05-18 14:35:20 +08001021 if (list_empty(&ghes_sci))
1022 register_acpi_hed_notifier(&ghes_notifier_sci);
1023 list_add_rcu(&ghes->list, &ghes_sci);
Huang Ying7ad6e942010-08-02 15:48:24 +08001024 mutex_unlock(&ghes_list_mutex);
Huang Ying81e88fd2011-01-12 14:44:55 +08001025 break;
1026 case ACPI_HEST_NOTIFY_NMI:
Tomasz Nowicki44a69f62014-07-22 11:20:12 +02001027 ghes_nmi_add(ghes);
Huang Ying81e88fd2011-01-12 14:44:55 +08001028 break;
1029 default:
1030 BUG();
Huang Yingd334a492010-05-18 14:35:20 +08001031 }
Huang Ying7ad6e942010-08-02 15:48:24 +08001032 platform_set_drvdata(ghes_dev, ghes);
Huang Yingd334a492010-05-18 14:35:20 +08001033
1034 return 0;
Mauro Carvalho Chehab21480542013-02-15 06:10:39 -03001035err_edac_unreg:
1036 ghes_edac_unregister(ghes);
Huang Yingd334a492010-05-18 14:35:20 +08001037err:
Huang Ying7ad6e942010-08-02 15:48:24 +08001038 if (ghes) {
Huang Yingd334a492010-05-18 14:35:20 +08001039 ghes_fini(ghes);
1040 kfree(ghes);
1041 }
Huang Ying7ad6e942010-08-02 15:48:24 +08001042 return rc;
Huang Yingd334a492010-05-18 14:35:20 +08001043}
1044
Bill Pembertonb59bc2f2012-11-21 23:13:09 +01001045static int ghes_remove(struct platform_device *ghes_dev)
Huang Ying7ad6e942010-08-02 15:48:24 +08001046{
1047 struct ghes *ghes;
1048 struct acpi_hest_generic *generic;
1049
1050 ghes = platform_get_drvdata(ghes_dev);
1051 generic = ghes->generic;
1052
Huang Ying81e88fd2011-01-12 14:44:55 +08001053 ghes->flags |= GHES_EXITING;
Huang Ying7ad6e942010-08-02 15:48:24 +08001054 switch (generic->notify.type) {
Huang Ying81e88fd2011-01-12 14:44:55 +08001055 case ACPI_HEST_NOTIFY_POLLED:
1056 del_timer_sync(&ghes->timer);
1057 break;
1058 case ACPI_HEST_NOTIFY_EXTERNAL:
1059 free_irq(ghes->irq, ghes);
1060 break;
Huang Ying7ad6e942010-08-02 15:48:24 +08001061 case ACPI_HEST_NOTIFY_SCI:
1062 mutex_lock(&ghes_list_mutex);
1063 list_del_rcu(&ghes->list);
1064 if (list_empty(&ghes_sci))
1065 unregister_acpi_hed_notifier(&ghes_notifier_sci);
1066 mutex_unlock(&ghes_list_mutex);
1067 break;
Huang Ying81e88fd2011-01-12 14:44:55 +08001068 case ACPI_HEST_NOTIFY_NMI:
Tomasz Nowicki44a69f62014-07-22 11:20:12 +02001069 ghes_nmi_remove(ghes);
Huang Ying81e88fd2011-01-12 14:44:55 +08001070 break;
Huang Ying7ad6e942010-08-02 15:48:24 +08001071 default:
1072 BUG();
1073 break;
1074 }
1075
Huang Ying7ad6e942010-08-02 15:48:24 +08001076 ghes_fini(ghes);
Mauro Carvalho Chehab21480542013-02-15 06:10:39 -03001077
1078 ghes_edac_unregister(ghes);
1079
Huang Ying7ad6e942010-08-02 15:48:24 +08001080 kfree(ghes);
1081
1082 platform_set_drvdata(ghes_dev, NULL);
1083
1084 return 0;
1085}
1086
1087static struct platform_driver ghes_platform_driver = {
1088 .driver = {
1089 .name = "GHES",
Huang Ying7ad6e942010-08-02 15:48:24 +08001090 },
1091 .probe = ghes_probe,
1092 .remove = ghes_remove,
1093};
1094
Huang Yingd334a492010-05-18 14:35:20 +08001095static int __init ghes_init(void)
1096{
Huang Ying81e88fd2011-01-12 14:44:55 +08001097 int rc;
1098
Huang Yingd334a492010-05-18 14:35:20 +08001099 if (acpi_disabled)
1100 return -ENODEV;
1101
1102 if (hest_disable) {
1103 pr_info(GHES_PFX "HEST is not enabled!\n");
1104 return -EINVAL;
1105 }
1106
Huang Yingb6a95012011-07-13 13:14:19 +08001107 if (ghes_disable) {
1108 pr_info(GHES_PFX "GHES is not enabled!\n");
1109 return -EINVAL;
1110 }
1111
Tomasz Nowicki44a69f62014-07-22 11:20:12 +02001112 ghes_nmi_init_cxt();
Huang Ying67eb2e92011-07-13 13:14:25 +08001113
Huang Ying81e88fd2011-01-12 14:44:55 +08001114 rc = ghes_ioremap_init();
1115 if (rc)
1116 goto err;
1117
Huang Ying67eb2e92011-07-13 13:14:25 +08001118 rc = ghes_estatus_pool_init();
Huang Ying81e88fd2011-01-12 14:44:55 +08001119 if (rc)
1120 goto err_ioremap_exit;
1121
Huang Ying152cef42011-07-13 13:14:26 +08001122 rc = ghes_estatus_pool_expand(GHES_ESTATUS_CACHE_AVG_SIZE *
1123 GHES_ESTATUS_CACHE_ALLOCED_MAX);
1124 if (rc)
1125 goto err_pool_exit;
1126
Huang Ying67eb2e92011-07-13 13:14:25 +08001127 rc = platform_driver_register(&ghes_platform_driver);
1128 if (rc)
1129 goto err_pool_exit;
1130
Huang Ying9fb0bfe2011-07-13 13:14:21 +08001131 rc = apei_osc_setup();
1132 if (rc == 0 && osc_sb_apei_support_acked)
1133 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
1134 else if (rc == 0 && !osc_sb_apei_support_acked)
1135 pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n");
1136 else if (rc && osc_sb_apei_support_acked)
1137 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
1138 else
1139 pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
1140
Huang Ying81e88fd2011-01-12 14:44:55 +08001141 return 0;
Huang Ying67eb2e92011-07-13 13:14:25 +08001142err_pool_exit:
1143 ghes_estatus_pool_exit();
Huang Ying81e88fd2011-01-12 14:44:55 +08001144err_ioremap_exit:
1145 ghes_ioremap_exit();
1146err:
1147 return rc;
Huang Yingd334a492010-05-18 14:35:20 +08001148}
1149
1150static void __exit ghes_exit(void)
1151{
Huang Ying7ad6e942010-08-02 15:48:24 +08001152 platform_driver_unregister(&ghes_platform_driver);
Huang Ying67eb2e92011-07-13 13:14:25 +08001153 ghes_estatus_pool_exit();
Huang Ying81e88fd2011-01-12 14:44:55 +08001154 ghes_ioremap_exit();
Huang Yingd334a492010-05-18 14:35:20 +08001155}
1156
1157module_init(ghes_init);
1158module_exit(ghes_exit);
1159
1160MODULE_AUTHOR("Huang Ying");
1161MODULE_DESCRIPTION("APEI Generic Hardware Error Source support");
1162MODULE_LICENSE("GPL");
Huang Ying7ad6e942010-08-02 15:48:24 +08001163MODULE_ALIAS("platform:GHES");