1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_MCE_H
3 #define _ASM_X86_MCE_H
4
5 #include <uapi/asm/mce.h>
6
7 /*
8 * Machine Check support for x86
9 */
10
11 /* MCG_CAP register defines */
12 #define MCG_BANKCNT_MASK 0xff /* Number of Banks */
13 #define MCG_CTL_P BIT_ULL(8) /* MCG_CTL register available */
14 #define MCG_EXT_P BIT_ULL(9) /* Extended registers available */
15 #define MCG_CMCI_P BIT_ULL(10) /* CMCI supported */
16 #define MCG_SEAM_NR BIT_ULL(12) /* MCG_STATUS_SEAM_NR supported */
17 #define MCG_EXT_CNT_MASK 0xff0000 /* Number of Extended registers */
18 #define MCG_EXT_CNT_SHIFT 16
19 #define MCG_EXT_CNT(c) (((c) & MCG_EXT_CNT_MASK) >> MCG_EXT_CNT_SHIFT)
20 #define MCG_SER_P BIT_ULL(24) /* MCA recovery/new status bits */
21 #define MCG_ELOG_P BIT_ULL(26) /* Extended error log supported */
22 #define MCG_LMCE_P BIT_ULL(27) /* Local machine check supported */
23
24 /* MCG_STATUS register defines */
25 #define MCG_STATUS_RIPV BIT_ULL(0) /* restart ip valid */
26 #define MCG_STATUS_EIPV BIT_ULL(1) /* ip points to correct instruction */
27 #define MCG_STATUS_MCIP BIT_ULL(2) /* machine check in progress */
28 #define MCG_STATUS_LMCES BIT_ULL(3) /* LMCE signaled */
29 #define MCG_STATUS_SEAM_NR BIT_ULL(12) /* Machine check inside SEAM non-root mode */
30
31 /* MCG_EXT_CTL register defines */
32 #define MCG_EXT_CTL_LMCE_EN BIT_ULL(0) /* Enable LMCE */
33
34 /* MCi_STATUS register defines */
35 #define MCI_STATUS_VAL BIT_ULL(63) /* valid error */
36 #define MCI_STATUS_OVER BIT_ULL(62) /* previous errors lost */
37 #define MCI_STATUS_UC BIT_ULL(61) /* uncorrected error */
38 #define MCI_STATUS_EN BIT_ULL(60) /* error enabled */
39 #define MCI_STATUS_MISCV BIT_ULL(59) /* misc error reg. valid */
40 #define MCI_STATUS_ADDRV BIT_ULL(58) /* addr reg. valid */
41 #define MCI_STATUS_PCC BIT_ULL(57) /* processor context corrupt */
42 #define MCI_STATUS_S BIT_ULL(56) /* Signaled machine check */
43 #define MCI_STATUS_AR BIT_ULL(55) /* Action required */
44 #define MCI_STATUS_CEC_SHIFT 38 /* Corrected Error Count */
45 #define MCI_STATUS_CEC_MASK GENMASK_ULL(52,38)
46 #define MCI_STATUS_CEC(c) (((c) & MCI_STATUS_CEC_MASK) >> MCI_STATUS_CEC_SHIFT)
47 #define MCI_STATUS_MSCOD(m) (((m) >> 16) & 0xffff)
48
49 /* AMD-specific bits */
50 #define MCI_STATUS_TCC BIT_ULL(55) /* Task context corrupt */
51 #define MCI_STATUS_SYNDV BIT_ULL(53) /* synd reg. valid */
52 #define MCI_STATUS_DEFERRED BIT_ULL(44) /* uncorrected error, deferred exception */
53 #define MCI_STATUS_POISON BIT_ULL(43) /* access poisonous data */
54 #define MCI_STATUS_SCRUB BIT_ULL(40) /* Error detected during scrub operation */
55
56 /*
57 * McaX field if set indicates a given bank supports MCA extensions:
58 * - Deferred error interrupt type is specifiable by bank.
59 * - MCx_MISC0[BlkPtr] field indicates presence of extended MISC registers,
60 * But should not be used to determine MSR numbers.
61 * - TCC bit is present in MCx_STATUS.
62 */
63 #define MCI_CONFIG_MCAX 0x1
64 #define MCI_IPID_MCATYPE 0xFFFF0000
65 #define MCI_IPID_HWID 0xFFF
66
67 /*
68 * Note that the full MCACOD field of IA32_MCi_STATUS MSR is
69 * bits 15:0. But bit 12 is the 'F' bit, defined for corrected
70 * errors to indicate that errors are being filtered by hardware.
71 * We should mask out bit 12 when looking for specific signatures
72 * of uncorrected errors - so the F bit is deliberately skipped
73 * in this #define.
74 */
75 #define MCACOD 0xefff /* MCA Error Code */
76
77 /* Architecturally defined codes from SDM Vol. 3B Chapter 15 */
78 #define MCACOD_SCRUB 0x00C0 /* 0xC0-0xCF Memory Scrubbing */
79 #define MCACOD_SCRUBMSK 0xeff0 /* Skip bit 12 ('F' bit) */
80 #define MCACOD_L3WB 0x017A /* L3 Explicit Writeback */
81 #define MCACOD_DATA 0x0134 /* Data Load */
82 #define MCACOD_INSTR 0x0150 /* Instruction Fetch */
83
84 /* MCi_MISC register defines */
85 #define MCI_MISC_ADDR_LSB(m) ((m) & 0x3f)
86 #define MCI_MISC_ADDR_MODE(m) (((m) >> 6) & 7)
87 #define MCI_MISC_ADDR_SEGOFF 0 /* segment offset */
88 #define MCI_MISC_ADDR_LINEAR 1 /* linear address */
89 #define MCI_MISC_ADDR_PHYS 2 /* physical address */
90 #define MCI_MISC_ADDR_MEM 3 /* memory address */
91 #define MCI_MISC_ADDR_GENERIC 7 /* generic */
92
93 /* MCi_ADDR register defines */
94 #define MCI_ADDR_PHYSADDR GENMASK_ULL(boot_cpu_data.x86_phys_bits - 1, 0)
95
96 /* CTL2 register defines */
97 #define MCI_CTL2_CMCI_EN BIT_ULL(30)
98 #define MCI_CTL2_CMCI_THRESHOLD_MASK 0x7fffULL
99
100 #define MCJ_CTX_MASK 3
101 #define MCJ_CTX(flags) ((flags) & MCJ_CTX_MASK)
102 #define MCJ_CTX_RANDOM 0 /* inject context: random */
103 #define MCJ_CTX_PROCESS 0x1 /* inject context: process */
104 #define MCJ_CTX_IRQ 0x2 /* inject context: IRQ */
105 #define MCJ_NMI_BROADCAST 0x4 /* do NMI broadcasting */
106 #define MCJ_EXCEPTION 0x8 /* raise as exception */
107 #define MCJ_IRQ_BROADCAST 0x10 /* do IRQ broadcasting */
108
109 #define MCE_OVERFLOW 0 /* bit 0 in flags means overflow */
110
111 #define MCE_LOG_MIN_LEN 32U
112 #define MCE_LOG_SIGNATURE "MACHINECHECK"
113
114 /* AMD Scalable MCA */
115 #define MSR_AMD64_SMCA_MC0_CTL 0xc0002000
116 #define MSR_AMD64_SMCA_MC0_STATUS 0xc0002001
117 #define MSR_AMD64_SMCA_MC0_ADDR 0xc0002002
118 #define MSR_AMD64_SMCA_MC0_MISC0 0xc0002003
119 #define MSR_AMD64_SMCA_MC0_CONFIG 0xc0002004
120 #define MSR_AMD64_SMCA_MC0_IPID 0xc0002005
121 #define MSR_AMD64_SMCA_MC0_SYND 0xc0002006
122 #define MSR_AMD64_SMCA_MC0_DESTAT 0xc0002008
123 #define MSR_AMD64_SMCA_MC0_DEADDR 0xc0002009
124 #define MSR_AMD64_SMCA_MC0_MISC1 0xc000200a
125 #define MSR_AMD64_SMCA_MCx_CTL(x) (MSR_AMD64_SMCA_MC0_CTL + 0x10*(x))
126 #define MSR_AMD64_SMCA_MCx_STATUS(x) (MSR_AMD64_SMCA_MC0_STATUS + 0x10*(x))
127 #define MSR_AMD64_SMCA_MCx_ADDR(x) (MSR_AMD64_SMCA_MC0_ADDR + 0x10*(x))
128 #define MSR_AMD64_SMCA_MCx_MISC(x) (MSR_AMD64_SMCA_MC0_MISC0 + 0x10*(x))
129 #define MSR_AMD64_SMCA_MCx_CONFIG(x) (MSR_AMD64_SMCA_MC0_CONFIG + 0x10*(x))
130 #define MSR_AMD64_SMCA_MCx_IPID(x) (MSR_AMD64_SMCA_MC0_IPID + 0x10*(x))
131 #define MSR_AMD64_SMCA_MCx_SYND(x) (MSR_AMD64_SMCA_MC0_SYND + 0x10*(x))
132 #define MSR_AMD64_SMCA_MCx_DESTAT(x) (MSR_AMD64_SMCA_MC0_DESTAT + 0x10*(x))
133 #define MSR_AMD64_SMCA_MCx_DEADDR(x) (MSR_AMD64_SMCA_MC0_DEADDR + 0x10*(x))
134 #define MSR_AMD64_SMCA_MCx_MISCy(x, y) ((MSR_AMD64_SMCA_MC0_MISC1 + y) + (0x10*(x)))
135
136 #define XEC(x, mask) (((x) >> 16) & mask)
137
138 /* mce.kflags flag bits for logging etc. */
139 #define MCE_HANDLED_CEC BIT_ULL(0)
140 #define MCE_HANDLED_UC BIT_ULL(1)
141 #define MCE_HANDLED_EXTLOG BIT_ULL(2)
142 #define MCE_HANDLED_NFIT BIT_ULL(3)
143 #define MCE_HANDLED_EDAC BIT_ULL(4)
144 #define MCE_HANDLED_MCELOG BIT_ULL(5)
145
146 /*
147 * Indicates an MCE which has happened in kernel space but from
148 * which the kernel can recover simply by executing fixup_exception()
149 * so that an error is returned to the caller of the function that
150 * hit the machine check.
151 */
152 #define MCE_IN_KERNEL_RECOV BIT_ULL(6)
153
154 /*
155 * Indicates an MCE that happened in kernel space while copying data
156 * from user. In this case fixup_exception() gets the kernel to the
157 * error exit for the copy function. Machine check handler can then
158 * treat it like a fault taken in user mode.
159 */
160 #define MCE_IN_KERNEL_COPYIN BIT_ULL(7)
161
162 /*
163 * This structure contains all data related to the MCE log. Also
164 * carries a signature to make it easier to find from external
165 * debugging tools. Each entry is only valid when its finished flag
166 * is set.
167 */
168 struct mce_log_buffer {
169 char signature[12]; /* "MACHINECHECK" */
170 unsigned len; /* = elements in .mce_entry[] */
171 unsigned next;
172 unsigned flags;
173 unsigned recordlen; /* length of struct mce */
174 struct mce entry[];
175 };
176
177 /* Highest last */
178 enum mce_notifier_prios {
179 MCE_PRIO_LOWEST,
180 MCE_PRIO_MCELOG,
181 MCE_PRIO_EDAC,
182 MCE_PRIO_NFIT,
183 MCE_PRIO_EXTLOG,
184 MCE_PRIO_UC,
185 MCE_PRIO_EARLY,
186 MCE_PRIO_CEC,
187 MCE_PRIO_HIGHEST = MCE_PRIO_CEC
188 };
189
190 struct notifier_block;
191 extern void mce_register_decode_chain(struct notifier_block *nb);
192 extern void mce_unregister_decode_chain(struct notifier_block *nb);
193
194 #include <linux/percpu.h>
195 #include <linux/atomic.h>
196
197 extern int mce_p5_enabled;
198
199 #ifdef CONFIG_ARCH_HAS_COPY_MC
200 extern void enable_copy_mc_fragile(void);
201 unsigned long __must_check copy_mc_fragile(void *dst, const void *src, unsigned cnt);
202 #else
enable_copy_mc_fragile(void)203 static inline void enable_copy_mc_fragile(void)
204 {
205 }
206 #endif
207
208 struct cper_ia_proc_ctx;
209
210 #ifdef CONFIG_X86_MCE
211 int mcheck_init(void);
212 void mcheck_cpu_init(struct cpuinfo_x86 *c);
213 void mcheck_cpu_clear(struct cpuinfo_x86 *c);
214 int apei_smca_report_x86_error(struct cper_ia_proc_ctx *ctx_info,
215 u64 lapic_id);
216 #else
mcheck_init(void)217 static inline int mcheck_init(void) { return 0; }
mcheck_cpu_init(struct cpuinfo_x86 * c)218 static inline void mcheck_cpu_init(struct cpuinfo_x86 *c) {}
mcheck_cpu_clear(struct cpuinfo_x86 * c)219 static inline void mcheck_cpu_clear(struct cpuinfo_x86 *c) {}
apei_smca_report_x86_error(struct cper_ia_proc_ctx * ctx_info,u64 lapic_id)220 static inline int apei_smca_report_x86_error(struct cper_ia_proc_ctx *ctx_info,
221 u64 lapic_id) { return -EINVAL; }
222 #endif
223
224 void mce_setup(struct mce *m);
225 void mce_log(struct mce *m);
226 DECLARE_PER_CPU(struct device *, mce_device);
227
228 /* Maximum number of MCA banks per CPU. */
229 #define MAX_NR_BANKS 64
230
231 #ifdef CONFIG_X86_MCE_INTEL
232 void mce_intel_feature_init(struct cpuinfo_x86 *c);
233 void mce_intel_feature_clear(struct cpuinfo_x86 *c);
234 void cmci_clear(void);
235 void cmci_reenable(void);
236 void cmci_rediscover(void);
237 void cmci_recheck(void);
238 #else
mce_intel_feature_init(struct cpuinfo_x86 * c)239 static inline void mce_intel_feature_init(struct cpuinfo_x86 *c) { }
mce_intel_feature_clear(struct cpuinfo_x86 * c)240 static inline void mce_intel_feature_clear(struct cpuinfo_x86 *c) { }
cmci_clear(void)241 static inline void cmci_clear(void) {}
cmci_reenable(void)242 static inline void cmci_reenable(void) {}
cmci_rediscover(void)243 static inline void cmci_rediscover(void) {}
cmci_recheck(void)244 static inline void cmci_recheck(void) {}
245 #endif
246
247 int mce_available(struct cpuinfo_x86 *c);
248 bool mce_is_memory_error(struct mce *m);
249 bool mce_is_correctable(struct mce *m);
250 bool mce_usable_address(struct mce *m);
251
252 DECLARE_PER_CPU(unsigned, mce_exception_count);
253 DECLARE_PER_CPU(unsigned, mce_poll_count);
254
255 typedef DECLARE_BITMAP(mce_banks_t, MAX_NR_BANKS);
256 DECLARE_PER_CPU(mce_banks_t, mce_poll_banks);
257
258 enum mcp_flags {
259 MCP_TIMESTAMP = BIT(0), /* log time stamp */
260 MCP_UC = BIT(1), /* log uncorrected errors */
261 MCP_DONTLOG = BIT(2), /* only clear, don't log */
262 MCP_QUEUE_LOG = BIT(3), /* only queue to genpool */
263 };
264 bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b);
265
266 int mce_notify_irq(void);
267
268 DECLARE_PER_CPU(struct mce, injectm);
269
270 /* Disable CMCI/polling for MCA bank claimed by firmware */
271 extern void mce_disable_bank(int bank);
272
273 /*
274 * Exception handler
275 */
276 void do_machine_check(struct pt_regs *pt_regs);
277
278 /*
279 * Threshold handler
280 */
281 extern void (*mce_threshold_vector)(void);
282
283 /* Deferred error interrupt handler */
284 extern void (*deferred_error_int_vector)(void);
285
286 /*
287 * Used by APEI to report memory error via /dev/mcelog
288 */
289
290 struct cper_sec_mem_err;
291 extern void apei_mce_report_mem_error(int corrected,
292 struct cper_sec_mem_err *mem_err);
293
294 /*
295 * Enumerate new IP types and HWID values in AMD processors which support
296 * Scalable MCA.
297 */
298 #ifdef CONFIG_X86_MCE_AMD
299
300 /* These may be used by multiple smca_hwid_mcatypes */
301 enum smca_bank_types {
302 SMCA_LS = 0, /* Load Store */
303 SMCA_LS_V2,
304 SMCA_IF, /* Instruction Fetch */
305 SMCA_L2_CACHE, /* L2 Cache */
306 SMCA_DE, /* Decoder Unit */
307 SMCA_RESERVED, /* Reserved */
308 SMCA_EX, /* Execution Unit */
309 SMCA_FP, /* Floating Point */
310 SMCA_L3_CACHE, /* L3 Cache */
311 SMCA_CS, /* Coherent Slave */
312 SMCA_CS_V2,
313 SMCA_PIE, /* Power, Interrupts, etc. */
314 SMCA_UMC, /* Unified Memory Controller */
315 SMCA_UMC_V2,
316 SMCA_MA_LLC, /* Memory Attached Last Level Cache */
317 SMCA_PB, /* Parameter Block */
318 SMCA_PSP, /* Platform Security Processor */
319 SMCA_PSP_V2,
320 SMCA_SMU, /* System Management Unit */
321 SMCA_SMU_V2,
322 SMCA_MP5, /* Microprocessor 5 Unit */
323 SMCA_MPDMA, /* MPDMA Unit */
324 SMCA_NBIO, /* Northbridge IO Unit */
325 SMCA_PCIE, /* PCI Express Unit */
326 SMCA_PCIE_V2,
327 SMCA_XGMI_PCS, /* xGMI PCS Unit */
328 SMCA_NBIF, /* NBIF Unit */
329 SMCA_SHUB, /* System HUB Unit */
330 SMCA_SATA, /* SATA Unit */
331 SMCA_USB, /* USB Unit */
332 SMCA_USR_DP, /* Ultra Short Reach Data Plane Controller */
333 SMCA_USR_CP, /* Ultra Short Reach Control Plane Controller */
334 SMCA_GMI_PCS, /* GMI PCS Unit */
335 SMCA_XGMI_PHY, /* xGMI PHY Unit */
336 SMCA_WAFL_PHY, /* WAFL PHY Unit */
337 SMCA_GMI_PHY, /* GMI PHY Unit */
338 N_SMCA_BANK_TYPES
339 };
340
341 extern bool amd_mce_is_memory_error(struct mce *m);
342
343 extern int mce_threshold_create_device(unsigned int cpu);
344 extern int mce_threshold_remove_device(unsigned int cpu);
345
346 void mce_amd_feature_init(struct cpuinfo_x86 *c);
347 enum smca_bank_types smca_get_bank_type(unsigned int cpu, unsigned int bank);
348 #else
349
mce_threshold_create_device(unsigned int cpu)350 static inline int mce_threshold_create_device(unsigned int cpu) { return 0; };
mce_threshold_remove_device(unsigned int cpu)351 static inline int mce_threshold_remove_device(unsigned int cpu) { return 0; };
amd_mce_is_memory_error(struct mce * m)352 static inline bool amd_mce_is_memory_error(struct mce *m) { return false; };
mce_amd_feature_init(struct cpuinfo_x86 * c)353 static inline void mce_amd_feature_init(struct cpuinfo_x86 *c) { }
354 #endif
355
mce_hygon_feature_init(struct cpuinfo_x86 * c)356 static inline void mce_hygon_feature_init(struct cpuinfo_x86 *c) { return mce_amd_feature_init(c); }
357
358 unsigned long copy_mc_fragile_handle_tail(char *to, char *from, unsigned len);
359
360 #endif /* _ASM_X86_MCE_H */
361