Commit | Line | Data |
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4b3db708 CG |
1 | /* |
2 | * Extended Error Log driver | |
3 | * | |
4 | * Copyright (C) 2013 Intel Corp. | |
5 | * Author: Chen, Gong <gong.chen@intel.com> | |
6 | * | |
7 | * This file is licensed under GPLv2. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/acpi.h> | |
4b3db708 CG |
12 | #include <linux/cper.h> |
13 | #include <linux/ratelimit.h> | |
42139eb3 | 14 | #include <linux/edac.h> |
4b3db708 CG |
15 | #include <asm/cpu.h> |
16 | #include <asm/mce.h> | |
17 | ||
18 | #include "apei/apei-internal.h" | |
19 | ||
20 | #define EXT_ELOG_ENTRY_MASK GENMASK_ULL(51, 0) /* elog entry address mask */ | |
21 | ||
22 | #define EXTLOG_DSM_REV 0x0 | |
4b3db708 CG |
23 | #define EXTLOG_FN_ADDR 0x1 |
24 | ||
25 | #define FLAG_OS_OPTIN BIT(0) | |
4b3db708 CG |
26 | #define ELOG_ENTRY_VALID (1ULL<<63) |
27 | #define ELOG_ENTRY_LEN 0x1000 | |
28 | ||
29 | #define EMCA_BUG \ | |
30 | "Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n" | |
31 | ||
32 | struct extlog_l1_head { | |
33 | u32 ver; /* Header Version */ | |
34 | u32 hdr_len; /* Header Length */ | |
35 | u64 total_len; /* entire L1 Directory length including this header */ | |
36 | u64 elog_base; /* MCA Error Log Directory base address */ | |
37 | u64 elog_len; /* MCA Error Log Directory length */ | |
38 | u32 flags; /* bit 0 - OS/VMM Opt-in */ | |
39 | u8 rev0[12]; | |
40 | u32 entries; /* Valid L1 Directory entries per logical processor */ | |
41 | u8 rev1[12]; | |
42 | }; | |
43 | ||
42139eb3 CG |
44 | static int old_edac_report_status; |
45 | ||
7ede9f8a | 46 | static u8 extlog_dsm_uuid[] __initdata = "663E35AF-CC10-41A4-88EA-5470AF055295"; |
4b3db708 CG |
47 | |
48 | /* L1 table related physical address */ | |
49 | static u64 elog_base; | |
50 | static size_t elog_size; | |
51 | static u64 l1_dirbase; | |
52 | static size_t l1_size; | |
53 | ||
54 | /* L1 table related virtual address */ | |
55 | static void __iomem *extlog_l1_addr; | |
56 | static void __iomem *elog_addr; | |
57 | ||
58 | static void *elog_buf; | |
59 | ||
60 | static u64 *l1_entry_base; | |
61 | static u32 l1_percpu_entry; | |
62 | ||
63 | #define ELOG_IDX(cpu, bank) \ | |
64 | (cpu_physical_id(cpu) * l1_percpu_entry + (bank)) | |
65 | ||
66 | #define ELOG_ENTRY_DATA(idx) \ | |
67 | (*(l1_entry_base + (idx))) | |
68 | ||
69 | #define ELOG_ENTRY_ADDR(phyaddr) \ | |
70 | (phyaddr - elog_base + (u8 *)elog_addr) | |
71 | ||
72 | static struct acpi_generic_status *extlog_elog_entry_check(int cpu, int bank) | |
73 | { | |
74 | int idx; | |
75 | u64 data; | |
76 | struct acpi_generic_status *estatus; | |
77 | ||
78 | WARN_ON(cpu < 0); | |
79 | idx = ELOG_IDX(cpu, bank); | |
80 | data = ELOG_ENTRY_DATA(idx); | |
81 | if ((data & ELOG_ENTRY_VALID) == 0) | |
82 | return NULL; | |
83 | ||
84 | data &= EXT_ELOG_ENTRY_MASK; | |
85 | estatus = (struct acpi_generic_status *)ELOG_ENTRY_ADDR(data); | |
86 | ||
87 | /* if no valid data in elog entry, just return */ | |
88 | if (estatus->block_status == 0) | |
89 | return NULL; | |
90 | ||
91 | return estatus; | |
92 | } | |
93 | ||
94 | static void __print_extlog_rcd(const char *pfx, | |
95 | struct acpi_generic_status *estatus, int cpu) | |
96 | { | |
97 | static atomic_t seqno; | |
98 | unsigned int curr_seqno; | |
99 | char pfx_seq[64]; | |
100 | ||
101 | if (!pfx) { | |
102 | if (estatus->error_severity <= CPER_SEV_CORRECTED) | |
103 | pfx = KERN_INFO; | |
104 | else | |
105 | pfx = KERN_ERR; | |
106 | } | |
107 | curr_seqno = atomic_inc_return(&seqno); | |
108 | snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno); | |
109 | printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu); | |
110 | cper_estatus_print(pfx_seq, estatus); | |
111 | } | |
112 | ||
113 | static int print_extlog_rcd(const char *pfx, | |
114 | struct acpi_generic_status *estatus, int cpu) | |
115 | { | |
116 | /* Not more than 2 messages every 5 seconds */ | |
117 | static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2); | |
118 | static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2); | |
119 | struct ratelimit_state *ratelimit; | |
120 | ||
121 | if (estatus->error_severity == CPER_SEV_CORRECTED || | |
122 | (estatus->error_severity == CPER_SEV_INFORMATIONAL)) | |
123 | ratelimit = &ratelimit_corrected; | |
124 | else | |
125 | ratelimit = &ratelimit_uncorrected; | |
126 | if (__ratelimit(ratelimit)) { | |
127 | __print_extlog_rcd(pfx, estatus, cpu); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | return 1; | |
132 | } | |
133 | ||
134 | static int extlog_print(struct notifier_block *nb, unsigned long val, | |
135 | void *data) | |
136 | { | |
137 | struct mce *mce = (struct mce *)data; | |
138 | int bank = mce->bank; | |
139 | int cpu = mce->extcpu; | |
140 | struct acpi_generic_status *estatus; | |
141 | int rc; | |
142 | ||
143 | estatus = extlog_elog_entry_check(cpu, bank); | |
144 | if (estatus == NULL) | |
145 | return NOTIFY_DONE; | |
146 | ||
147 | memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN); | |
148 | /* clear record status to enable BIOS to update it again */ | |
149 | estatus->block_status = 0; | |
150 | ||
151 | rc = print_extlog_rcd(NULL, (struct acpi_generic_status *)elog_buf, cpu); | |
152 | ||
42139eb3 | 153 | return NOTIFY_STOP; |
4b3db708 CG |
154 | } |
155 | ||
7ede9f8a | 156 | static bool __init extlog_get_l1addr(void) |
4b3db708 | 157 | { |
4b3db708 | 158 | u8 uuid[16]; |
7ede9f8a JL |
159 | acpi_handle handle; |
160 | union acpi_object *obj; | |
4b3db708 CG |
161 | |
162 | acpi_str_to_uuid(extlog_dsm_uuid, uuid); | |
4b3db708 CG |
163 | |
164 | if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) | |
165 | return false; | |
7ede9f8a | 166 | if (!acpi_check_dsm(handle, uuid, EXTLOG_DSM_REV, 1 << EXTLOG_FN_ADDR)) |
4b3db708 | 167 | return false; |
7ede9f8a JL |
168 | obj = acpi_evaluate_dsm_typed(handle, uuid, EXTLOG_DSM_REV, |
169 | EXTLOG_FN_ADDR, NULL, ACPI_TYPE_INTEGER); | |
170 | if (!obj) { | |
4b3db708 | 171 | return false; |
7ede9f8a JL |
172 | } else { |
173 | l1_dirbase = obj->integer.value; | |
174 | ACPI_FREE(obj); | |
175 | } | |
4b3db708 | 176 | |
4b3db708 CG |
177 | /* Spec says L1 directory must be 4K aligned, bail out if it isn't */ |
178 | if (l1_dirbase & ((1 << 12) - 1)) { | |
179 | pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n", | |
180 | l1_dirbase); | |
181 | return false; | |
182 | } | |
183 | ||
184 | return true; | |
185 | } | |
186 | static struct notifier_block extlog_mce_dec = { | |
187 | .notifier_call = extlog_print, | |
188 | }; | |
189 | ||
190 | static int __init extlog_init(void) | |
191 | { | |
192 | struct extlog_l1_head *l1_head; | |
193 | void __iomem *extlog_l1_hdr; | |
194 | size_t l1_hdr_size; | |
195 | struct resource *r; | |
196 | u64 cap; | |
197 | int rc; | |
198 | ||
42139eb3 CG |
199 | if (get_edac_report_status() == EDAC_REPORTING_FORCE) { |
200 | pr_warn("Not loading eMCA, error reporting force-enabled through EDAC.\n"); | |
201 | return -EPERM; | |
202 | } | |
4b3db708 | 203 | |
42139eb3 | 204 | rc = -ENODEV; |
4b3db708 CG |
205 | rdmsrl(MSR_IA32_MCG_CAP, cap); |
206 | if (!(cap & MCG_ELOG_P)) | |
207 | return rc; | |
208 | ||
209 | if (!extlog_get_l1addr()) | |
210 | return rc; | |
211 | ||
212 | rc = -EINVAL; | |
213 | /* get L1 header to fetch necessary information */ | |
214 | l1_hdr_size = sizeof(struct extlog_l1_head); | |
215 | r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR"); | |
216 | if (!r) { | |
217 | pr_warn(FW_BUG EMCA_BUG, | |
218 | (unsigned long long)l1_dirbase, | |
219 | (unsigned long long)l1_dirbase + l1_hdr_size); | |
220 | goto err; | |
221 | } | |
222 | ||
223 | extlog_l1_hdr = acpi_os_map_memory(l1_dirbase, l1_hdr_size); | |
224 | l1_head = (struct extlog_l1_head *)extlog_l1_hdr; | |
225 | l1_size = l1_head->total_len; | |
226 | l1_percpu_entry = l1_head->entries; | |
227 | elog_base = l1_head->elog_base; | |
228 | elog_size = l1_head->elog_len; | |
229 | acpi_os_unmap_memory(extlog_l1_hdr, l1_hdr_size); | |
230 | release_mem_region(l1_dirbase, l1_hdr_size); | |
231 | ||
232 | /* remap L1 header again based on completed information */ | |
233 | r = request_mem_region(l1_dirbase, l1_size, "L1 Table"); | |
234 | if (!r) { | |
235 | pr_warn(FW_BUG EMCA_BUG, | |
236 | (unsigned long long)l1_dirbase, | |
237 | (unsigned long long)l1_dirbase + l1_size); | |
238 | goto err; | |
239 | } | |
240 | extlog_l1_addr = acpi_os_map_memory(l1_dirbase, l1_size); | |
241 | l1_entry_base = (u64 *)((u8 *)extlog_l1_addr + l1_hdr_size); | |
242 | ||
243 | /* remap elog table */ | |
244 | r = request_mem_region(elog_base, elog_size, "Elog Table"); | |
245 | if (!r) { | |
246 | pr_warn(FW_BUG EMCA_BUG, | |
247 | (unsigned long long)elog_base, | |
248 | (unsigned long long)elog_base + elog_size); | |
249 | goto err_release_l1_dir; | |
250 | } | |
251 | elog_addr = acpi_os_map_memory(elog_base, elog_size); | |
252 | ||
253 | rc = -ENOMEM; | |
254 | /* allocate buffer to save elog record */ | |
255 | elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL); | |
256 | if (elog_buf == NULL) | |
257 | goto err_release_elog; | |
258 | ||
42139eb3 CG |
259 | /* |
260 | * eMCA event report method has higher priority than EDAC method, | |
261 | * unless EDAC event report method is mandatory. | |
262 | */ | |
263 | old_edac_report_status = get_edac_report_status(); | |
264 | set_edac_report_status(EDAC_REPORTING_DISABLED); | |
4b3db708 CG |
265 | mce_register_decode_chain(&extlog_mce_dec); |
266 | /* enable OS to be involved to take over management from BIOS */ | |
267 | ((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN; | |
268 | ||
269 | return 0; | |
270 | ||
271 | err_release_elog: | |
272 | if (elog_addr) | |
273 | acpi_os_unmap_memory(elog_addr, elog_size); | |
274 | release_mem_region(elog_base, elog_size); | |
275 | err_release_l1_dir: | |
276 | if (extlog_l1_addr) | |
277 | acpi_os_unmap_memory(extlog_l1_addr, l1_size); | |
278 | release_mem_region(l1_dirbase, l1_size); | |
279 | err: | |
280 | pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n"); | |
281 | return rc; | |
282 | } | |
283 | ||
284 | static void __exit extlog_exit(void) | |
285 | { | |
42139eb3 | 286 | set_edac_report_status(old_edac_report_status); |
4b3db708 CG |
287 | mce_unregister_decode_chain(&extlog_mce_dec); |
288 | ((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN; | |
289 | if (extlog_l1_addr) | |
290 | acpi_os_unmap_memory(extlog_l1_addr, l1_size); | |
291 | if (elog_addr) | |
292 | acpi_os_unmap_memory(elog_addr, elog_size); | |
293 | release_mem_region(elog_base, elog_size); | |
294 | release_mem_region(l1_dirbase, l1_size); | |
295 | kfree(elog_buf); | |
296 | } | |
297 | ||
298 | module_init(extlog_init); | |
299 | module_exit(extlog_exit); | |
300 | ||
301 | MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>"); | |
302 | MODULE_DESCRIPTION("Extended MCA Error Log Driver"); | |
303 | MODULE_LICENSE("GPL"); |