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82664963 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
4b3db708 CG |
2 | /* |
3 | * Extended Error Log driver | |
4 | * | |
5 | * Copyright (C) 2013 Intel Corp. | |
6 | * Author: Chen, Gong <gong.chen@intel.com> | |
4b3db708 CG |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/acpi.h> | |
4b3db708 CG |
11 | #include <linux/cper.h> |
12 | #include <linux/ratelimit.h> | |
42139eb3 | 13 | #include <linux/edac.h> |
d6cae935 | 14 | #include <linux/ras.h> |
4b3db708 CG |
15 | #include <asm/cpu.h> |
16 | #include <asm/mce.h> | |
17 | ||
18 | #include "apei/apei-internal.h" | |
2dfb7d51 | 19 | #include <ras/ras_event.h> |
4b3db708 CG |
20 | |
21 | #define EXT_ELOG_ENTRY_MASK GENMASK_ULL(51, 0) /* elog entry address mask */ | |
22 | ||
23 | #define EXTLOG_DSM_REV 0x0 | |
4b3db708 CG |
24 | #define EXTLOG_FN_ADDR 0x1 |
25 | ||
26 | #define FLAG_OS_OPTIN BIT(0) | |
4b3db708 CG |
27 | #define ELOG_ENTRY_VALID (1ULL<<63) |
28 | #define ELOG_ENTRY_LEN 0x1000 | |
29 | ||
30 | #define EMCA_BUG \ | |
31 | "Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n" | |
32 | ||
33 | struct extlog_l1_head { | |
34 | u32 ver; /* Header Version */ | |
35 | u32 hdr_len; /* Header Length */ | |
36 | u64 total_len; /* entire L1 Directory length including this header */ | |
37 | u64 elog_base; /* MCA Error Log Directory base address */ | |
38 | u64 elog_len; /* MCA Error Log Directory length */ | |
39 | u32 flags; /* bit 0 - OS/VMM Opt-in */ | |
40 | u8 rev0[12]; | |
41 | u32 entries; /* Valid L1 Directory entries per logical processor */ | |
42 | u8 rev1[12]; | |
43 | }; | |
44 | ||
7ede9f8a | 45 | static u8 extlog_dsm_uuid[] __initdata = "663E35AF-CC10-41A4-88EA-5470AF055295"; |
4b3db708 CG |
46 | |
47 | /* L1 table related physical address */ | |
48 | static u64 elog_base; | |
49 | static size_t elog_size; | |
50 | static u64 l1_dirbase; | |
51 | static size_t l1_size; | |
52 | ||
53 | /* L1 table related virtual address */ | |
54 | static void __iomem *extlog_l1_addr; | |
55 | static void __iomem *elog_addr; | |
56 | ||
57 | static void *elog_buf; | |
58 | ||
59 | static u64 *l1_entry_base; | |
60 | static u32 l1_percpu_entry; | |
61 | ||
62 | #define ELOG_IDX(cpu, bank) \ | |
63 | (cpu_physical_id(cpu) * l1_percpu_entry + (bank)) | |
64 | ||
65 | #define ELOG_ENTRY_DATA(idx) \ | |
66 | (*(l1_entry_base + (idx))) | |
67 | ||
68 | #define ELOG_ENTRY_ADDR(phyaddr) \ | |
69 | (phyaddr - elog_base + (u8 *)elog_addr) | |
70 | ||
0a00fd5e | 71 | static struct acpi_hest_generic_status *extlog_elog_entry_check(int cpu, int bank) |
4b3db708 CG |
72 | { |
73 | int idx; | |
74 | u64 data; | |
0a00fd5e | 75 | struct acpi_hest_generic_status *estatus; |
4b3db708 CG |
76 | |
77 | WARN_ON(cpu < 0); | |
78 | idx = ELOG_IDX(cpu, bank); | |
79 | data = ELOG_ENTRY_DATA(idx); | |
80 | if ((data & ELOG_ENTRY_VALID) == 0) | |
81 | return NULL; | |
82 | ||
83 | data &= EXT_ELOG_ENTRY_MASK; | |
0a00fd5e | 84 | estatus = (struct acpi_hest_generic_status *)ELOG_ENTRY_ADDR(data); |
4b3db708 CG |
85 | |
86 | /* if no valid data in elog entry, just return */ | |
87 | if (estatus->block_status == 0) | |
88 | return NULL; | |
89 | ||
90 | return estatus; | |
91 | } | |
92 | ||
93 | static void __print_extlog_rcd(const char *pfx, | |
0a00fd5e | 94 | struct acpi_hest_generic_status *estatus, int cpu) |
4b3db708 CG |
95 | { |
96 | static atomic_t seqno; | |
97 | unsigned int curr_seqno; | |
98 | char pfx_seq[64]; | |
99 | ||
100 | if (!pfx) { | |
101 | if (estatus->error_severity <= CPER_SEV_CORRECTED) | |
102 | pfx = KERN_INFO; | |
103 | else | |
104 | pfx = KERN_ERR; | |
105 | } | |
106 | curr_seqno = atomic_inc_return(&seqno); | |
107 | snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno); | |
108 | printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu); | |
109 | cper_estatus_print(pfx_seq, estatus); | |
110 | } | |
111 | ||
112 | static int print_extlog_rcd(const char *pfx, | |
0a00fd5e | 113 | struct acpi_hest_generic_status *estatus, int cpu) |
4b3db708 CG |
114 | { |
115 | /* Not more than 2 messages every 5 seconds */ | |
116 | static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2); | |
117 | static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2); | |
118 | struct ratelimit_state *ratelimit; | |
119 | ||
120 | if (estatus->error_severity == CPER_SEV_CORRECTED || | |
121 | (estatus->error_severity == CPER_SEV_INFORMATIONAL)) | |
122 | ratelimit = &ratelimit_corrected; | |
123 | else | |
124 | ratelimit = &ratelimit_uncorrected; | |
125 | if (__ratelimit(ratelimit)) { | |
126 | __print_extlog_rcd(pfx, estatus, cpu); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | return 1; | |
131 | } | |
132 | ||
133 | static int extlog_print(struct notifier_block *nb, unsigned long val, | |
134 | void *data) | |
135 | { | |
136 | struct mce *mce = (struct mce *)data; | |
137 | int bank = mce->bank; | |
138 | int cpu = mce->extcpu; | |
77251319 LT |
139 | struct acpi_hest_generic_status *estatus, *tmp; |
140 | struct acpi_hest_generic_data *gdata; | |
b7fe9299 | 141 | const guid_t *fru_id = &guid_null; |
2dfb7d51 | 142 | char *fru_text = ""; |
b7fe9299 | 143 | guid_t *sec_type; |
2dfb7d51 | 144 | static u32 err_seq; |
4b3db708 CG |
145 | |
146 | estatus = extlog_elog_entry_check(cpu, bank); | |
23ba710a | 147 | if (estatus == NULL || (mce->kflags & MCE_HANDLED_CEC)) |
4b3db708 CG |
148 | return NOTIFY_DONE; |
149 | ||
150 | memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN); | |
151 | /* clear record status to enable BIOS to update it again */ | |
152 | estatus->block_status = 0; | |
153 | ||
77251319 | 154 | tmp = (struct acpi_hest_generic_status *)elog_buf; |
d6cae935 CG |
155 | |
156 | if (!ras_userspace_consumers()) { | |
157 | print_extlog_rcd(NULL, tmp, cpu); | |
158 | goto out; | |
159 | } | |
2dfb7d51 CG |
160 | |
161 | /* log event via trace */ | |
162 | err_seq++; | |
77251319 | 163 | gdata = (struct acpi_hest_generic_data *)(tmp + 1); |
2dfb7d51 | 164 | if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID) |
b7fe9299 | 165 | fru_id = (guid_t *)gdata->fru_id; |
2dfb7d51 CG |
166 | if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT) |
167 | fru_text = gdata->fru_text; | |
b7fe9299 AS |
168 | sec_type = (guid_t *)gdata->section_type; |
169 | if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) { | |
2dfb7d51 CG |
170 | struct cper_sec_mem_err *mem = (void *)(gdata + 1); |
171 | if (gdata->error_data_length >= sizeof(*mem)) | |
172 | trace_extlog_mem_event(mem, err_seq, fru_id, fru_text, | |
173 | (u8)gdata->error_severity); | |
174 | } | |
4b3db708 | 175 | |
d6cae935 | 176 | out: |
23ba710a TL |
177 | mce->kflags |= MCE_HANDLED_EXTLOG; |
178 | return NOTIFY_OK; | |
4b3db708 CG |
179 | } |
180 | ||
7ede9f8a | 181 | static bool __init extlog_get_l1addr(void) |
4b3db708 | 182 | { |
b7fe9299 | 183 | guid_t guid; |
7ede9f8a JL |
184 | acpi_handle handle; |
185 | union acpi_object *obj; | |
4b3db708 | 186 | |
b7fe9299 AS |
187 | if (guid_parse(extlog_dsm_uuid, &guid)) |
188 | return false; | |
4b3db708 CG |
189 | if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) |
190 | return false; | |
94116f81 | 191 | if (!acpi_check_dsm(handle, &guid, EXTLOG_DSM_REV, 1 << EXTLOG_FN_ADDR)) |
4b3db708 | 192 | return false; |
94116f81 | 193 | obj = acpi_evaluate_dsm_typed(handle, &guid, EXTLOG_DSM_REV, |
7ede9f8a JL |
194 | EXTLOG_FN_ADDR, NULL, ACPI_TYPE_INTEGER); |
195 | if (!obj) { | |
4b3db708 | 196 | return false; |
7ede9f8a JL |
197 | } else { |
198 | l1_dirbase = obj->integer.value; | |
199 | ACPI_FREE(obj); | |
200 | } | |
4b3db708 | 201 | |
4b3db708 CG |
202 | /* Spec says L1 directory must be 4K aligned, bail out if it isn't */ |
203 | if (l1_dirbase & ((1 << 12) - 1)) { | |
204 | pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n", | |
205 | l1_dirbase); | |
206 | return false; | |
207 | } | |
208 | ||
209 | return true; | |
210 | } | |
211 | static struct notifier_block extlog_mce_dec = { | |
212 | .notifier_call = extlog_print, | |
9026cc82 | 213 | .priority = MCE_PRIO_EXTLOG, |
4b3db708 CG |
214 | }; |
215 | ||
216 | static int __init extlog_init(void) | |
217 | { | |
218 | struct extlog_l1_head *l1_head; | |
219 | void __iomem *extlog_l1_hdr; | |
220 | size_t l1_hdr_size; | |
221 | struct resource *r; | |
222 | u64 cap; | |
223 | int rc; | |
224 | ||
7c76bb5f CG |
225 | rdmsrl(MSR_IA32_MCG_CAP, cap); |
226 | ||
227 | if (!(cap & MCG_ELOG_P) || !extlog_get_l1addr()) | |
228 | return -ENODEV; | |
229 | ||
4b3db708 CG |
230 | rc = -EINVAL; |
231 | /* get L1 header to fetch necessary information */ | |
232 | l1_hdr_size = sizeof(struct extlog_l1_head); | |
233 | r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR"); | |
234 | if (!r) { | |
235 | pr_warn(FW_BUG EMCA_BUG, | |
236 | (unsigned long long)l1_dirbase, | |
237 | (unsigned long long)l1_dirbase + l1_hdr_size); | |
238 | goto err; | |
239 | } | |
240 | ||
a238317c | 241 | extlog_l1_hdr = acpi_os_map_iomem(l1_dirbase, l1_hdr_size); |
4b3db708 CG |
242 | l1_head = (struct extlog_l1_head *)extlog_l1_hdr; |
243 | l1_size = l1_head->total_len; | |
244 | l1_percpu_entry = l1_head->entries; | |
245 | elog_base = l1_head->elog_base; | |
246 | elog_size = l1_head->elog_len; | |
a238317c | 247 | acpi_os_unmap_iomem(extlog_l1_hdr, l1_hdr_size); |
4b3db708 CG |
248 | release_mem_region(l1_dirbase, l1_hdr_size); |
249 | ||
250 | /* remap L1 header again based on completed information */ | |
251 | r = request_mem_region(l1_dirbase, l1_size, "L1 Table"); | |
252 | if (!r) { | |
253 | pr_warn(FW_BUG EMCA_BUG, | |
254 | (unsigned long long)l1_dirbase, | |
255 | (unsigned long long)l1_dirbase + l1_size); | |
256 | goto err; | |
257 | } | |
a238317c | 258 | extlog_l1_addr = acpi_os_map_iomem(l1_dirbase, l1_size); |
4b3db708 CG |
259 | l1_entry_base = (u64 *)((u8 *)extlog_l1_addr + l1_hdr_size); |
260 | ||
261 | /* remap elog table */ | |
262 | r = request_mem_region(elog_base, elog_size, "Elog Table"); | |
263 | if (!r) { | |
264 | pr_warn(FW_BUG EMCA_BUG, | |
265 | (unsigned long long)elog_base, | |
266 | (unsigned long long)elog_base + elog_size); | |
267 | goto err_release_l1_dir; | |
268 | } | |
a238317c | 269 | elog_addr = acpi_os_map_iomem(elog_base, elog_size); |
4b3db708 CG |
270 | |
271 | rc = -ENOMEM; | |
272 | /* allocate buffer to save elog record */ | |
273 | elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL); | |
274 | if (elog_buf == NULL) | |
275 | goto err_release_elog; | |
276 | ||
277 | mce_register_decode_chain(&extlog_mce_dec); | |
278 | /* enable OS to be involved to take over management from BIOS */ | |
279 | ((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN; | |
280 | ||
281 | return 0; | |
282 | ||
283 | err_release_elog: | |
284 | if (elog_addr) | |
a238317c | 285 | acpi_os_unmap_iomem(elog_addr, elog_size); |
4b3db708 CG |
286 | release_mem_region(elog_base, elog_size); |
287 | err_release_l1_dir: | |
288 | if (extlog_l1_addr) | |
a238317c | 289 | acpi_os_unmap_iomem(extlog_l1_addr, l1_size); |
4b3db708 CG |
290 | release_mem_region(l1_dirbase, l1_size); |
291 | err: | |
292 | pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n"); | |
293 | return rc; | |
294 | } | |
295 | ||
296 | static void __exit extlog_exit(void) | |
297 | { | |
298 | mce_unregister_decode_chain(&extlog_mce_dec); | |
299 | ((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN; | |
300 | if (extlog_l1_addr) | |
a238317c | 301 | acpi_os_unmap_iomem(extlog_l1_addr, l1_size); |
4b3db708 | 302 | if (elog_addr) |
a238317c | 303 | acpi_os_unmap_iomem(elog_addr, elog_size); |
4b3db708 CG |
304 | release_mem_region(elog_base, elog_size); |
305 | release_mem_region(l1_dirbase, l1_size); | |
306 | kfree(elog_buf); | |
307 | } | |
308 | ||
309 | module_init(extlog_init); | |
310 | module_exit(extlog_exit); | |
311 | ||
312 | MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>"); | |
313 | MODULE_DESCRIPTION("Extended MCA Error Log Driver"); | |
314 | MODULE_LICENSE("GPL"); |