1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Machine check exception handling CPU-side for power7 and power8
5 * Copyright 2013 IBM Corporation
6 * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
10 #define pr_fmt(fmt) "mce_power: " fmt
12 #include <linux/types.h>
13 #include <linux/ptrace.h>
14 #include <linux/extable.h>
15 #include <linux/pgtable.h>
18 #include <asm/machdep.h>
19 #include <asm/pte-walk.h>
20 #include <asm/sstep.h>
21 #include <asm/exception-64s.h>
22 #include <asm/extable.h>
26 * Convert an address related to an mm to a PFN. NOTE: we are in real
27 * mode, we could potentially race with page table updates.
29 unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
33 unsigned long pfn, flags;
41 local_irq_save(flags);
42 ptep = __find_linux_pte(mm->pgd, addr, NULL, &shift);
47 pte = READ_ONCE(*ptep);
49 if (!pte_present(pte) || pte_special(pte)) {
54 if (shift <= PAGE_SHIFT)
57 unsigned long rpnmask = (1ul << shift) - PAGE_SIZE;
58 pfn = pte_pfn(__pte(pte_val(pte) | (addr & rpnmask)));
61 local_irq_restore(flags);
65 static bool mce_in_guest(void)
67 #ifdef CONFIG_KVM_BOOK3S_HANDLER
69 * If machine check is hit when in guest context or low level KVM
70 * code, avoid looking up any translations or making any attempts
71 * to recover, just record the event and pass to KVM.
73 if (get_paca()->kvm_hstate.in_guest)
79 /* flush SLBs and reload */
80 #ifdef CONFIG_PPC_BOOK3S_64
81 void flush_and_reload_slb(void)
83 /* Invalidate all SLBs */
84 slb_flush_all_realmode();
86 if (early_radix_enabled())
90 * This probably shouldn't happen, but it may be possible it's
91 * called in early boot before SLB shadows are allocated.
93 if (!get_slb_shadow())
96 slb_restore_bolted_realmode();
100 void flush_erat(void)
102 #ifdef CONFIG_PPC_BOOK3S_64
103 if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) {
104 flush_and_reload_slb();
108 asm volatile(PPC_ISA_3_0_INVALIDATE_ERAT : : :"memory");
111 #define MCE_FLUSH_SLB 1
112 #define MCE_FLUSH_TLB 2
113 #define MCE_FLUSH_ERAT 3
115 static int mce_flush(int what)
117 #ifdef CONFIG_PPC_BOOK3S_64
118 if (what == MCE_FLUSH_SLB) {
119 flush_and_reload_slb();
123 if (what == MCE_FLUSH_ERAT) {
127 if (what == MCE_FLUSH_TLB) {
135 #define SRR1_MC_LOADSTORE(srr1) ((srr1) & PPC_BIT(42))
137 struct mce_ierror_table {
138 unsigned long srr1_mask;
139 unsigned long srr1_value;
140 bool nip_valid; /* nip is a valid indicator of faulting address */
141 unsigned int error_type;
142 unsigned int error_subtype;
143 unsigned int error_class;
144 unsigned int initiator;
145 unsigned int severity;
149 static const struct mce_ierror_table mce_p7_ierror_table[] = {
150 { 0x00000000001c0000, 0x0000000000040000, true,
151 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE,
152 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
153 { 0x00000000001c0000, 0x0000000000080000, true,
154 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE,
155 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
156 { 0x00000000001c0000, 0x00000000000c0000, true,
157 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
158 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
159 { 0x00000000001c0000, 0x0000000000100000, true,
160 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_INDETERMINATE, /* BOTH */
161 MCE_ECLASS_SOFT_INDETERMINATE,
162 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
163 { 0x00000000001c0000, 0x0000000000140000, true,
164 MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
165 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
166 { 0x00000000001c0000, 0x0000000000180000, true,
167 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH, MCE_ECLASS_HARDWARE,
168 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
169 { 0x00000000001c0000, 0x00000000001c0000, true,
170 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE,
171 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
172 { 0, 0, 0, 0, 0, 0, 0 } };
174 static const struct mce_ierror_table mce_p8_ierror_table[] = {
175 { 0x00000000081c0000, 0x0000000000040000, true,
176 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE,
177 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
178 { 0x00000000081c0000, 0x0000000000080000, true,
179 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE,
180 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
181 { 0x00000000081c0000, 0x00000000000c0000, true,
182 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
183 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
184 { 0x00000000081c0000, 0x0000000000100000, true,
185 MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
186 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
187 { 0x00000000081c0000, 0x0000000000140000, true,
188 MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
189 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
190 { 0x00000000081c0000, 0x0000000000180000, true,
191 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH,
193 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
194 { 0x00000000081c0000, 0x00000000001c0000, true,
195 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE,
196 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
197 { 0x00000000081c0000, 0x0000000008000000, true,
198 MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_IFETCH_TIMEOUT, MCE_ECLASS_HARDWARE,
199 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
200 { 0x00000000081c0000, 0x0000000008040000, true,
201 MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_PAGE_TABLE_WALK_IFETCH_TIMEOUT,
203 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
204 { 0, 0, 0, 0, 0, 0, 0 } };
206 static const struct mce_ierror_table mce_p9_ierror_table[] = {
207 { 0x00000000081c0000, 0x0000000000040000, true,
208 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE,
209 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
210 { 0x00000000081c0000, 0x0000000000080000, true,
211 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE,
212 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
213 { 0x00000000081c0000, 0x00000000000c0000, true,
214 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
215 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
216 { 0x00000000081c0000, 0x0000000000100000, true,
217 MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
218 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
219 { 0x00000000081c0000, 0x0000000000140000, true,
220 MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
221 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
222 { 0x00000000081c0000, 0x0000000000180000, true,
223 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH, MCE_ECLASS_HARDWARE,
224 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
225 { 0x00000000081c0000, 0x00000000001c0000, true,
226 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_IFETCH_FOREIGN, MCE_ECLASS_SOFTWARE,
227 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
228 { 0x00000000081c0000, 0x0000000008000000, true,
229 MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_IFETCH_TIMEOUT, MCE_ECLASS_HARDWARE,
230 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
231 { 0x00000000081c0000, 0x0000000008040000, true,
232 MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_PAGE_TABLE_WALK_IFETCH_TIMEOUT,
234 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
235 { 0x00000000081c0000, 0x00000000080c0000, true,
236 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_IFETCH, MCE_ECLASS_SOFTWARE,
237 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
238 { 0x00000000081c0000, 0x0000000008100000, true,
239 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH, MCE_ECLASS_SOFTWARE,
240 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
241 { 0x00000000081c0000, 0x0000000008140000, false,
242 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_STORE, MCE_ECLASS_HARDWARE,
243 MCE_INITIATOR_CPU, MCE_SEV_FATAL, false }, /* ASYNC is fatal */
244 { 0x00000000081c0000, 0x0000000008180000, false,
245 MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_STORE_TIMEOUT,
246 MCE_INITIATOR_CPU, MCE_SEV_FATAL, false }, /* ASYNC is fatal */
247 { 0x00000000081c0000, 0x00000000081c0000, true, MCE_ECLASS_HARDWARE,
248 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH_FOREIGN,
249 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
250 { 0, 0, 0, 0, 0, 0, 0 } };
252 static const struct mce_ierror_table mce_p10_ierror_table[] = {
253 { 0x00000000081c0000, 0x0000000000040000, true,
254 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE,
255 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
256 { 0x00000000081c0000, 0x0000000000080000, true,
257 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE,
258 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
259 { 0x00000000081c0000, 0x00000000000c0000, true,
260 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
261 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
262 { 0x00000000081c0000, 0x0000000000100000, true,
263 MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
264 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
265 { 0x00000000081c0000, 0x0000000000140000, true,
266 MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
267 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
268 { 0x00000000081c0000, 0x0000000000180000, true,
269 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH, MCE_ECLASS_HARDWARE,
270 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
271 { 0x00000000081c0000, 0x00000000001c0000, true,
272 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_IFETCH_FOREIGN, MCE_ECLASS_SOFTWARE,
273 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
274 { 0x00000000081c0000, 0x0000000008080000, true,
275 MCE_ERROR_TYPE_USER,MCE_USER_ERROR_SCV, MCE_ECLASS_SOFTWARE,
276 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
277 { 0x00000000081c0000, 0x00000000080c0000, true,
278 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_IFETCH, MCE_ECLASS_SOFTWARE,
279 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
280 { 0x00000000081c0000, 0x0000000008100000, true,
281 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH, MCE_ECLASS_SOFTWARE,
282 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
283 { 0x00000000081c0000, 0x0000000008140000, false,
284 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_STORE, MCE_ECLASS_HARDWARE,
285 MCE_INITIATOR_CPU, MCE_SEV_FATAL, false }, /* ASYNC is fatal */
286 { 0x00000000081c0000, 0x00000000081c0000, true, MCE_ECLASS_HARDWARE,
287 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH_FOREIGN,
288 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
289 { 0, 0, 0, 0, 0, 0, 0 } };
291 struct mce_derror_table {
292 unsigned long dsisr_value;
293 bool dar_valid; /* dar is a valid indicator of faulting address */
294 unsigned int error_type;
295 unsigned int error_subtype;
296 unsigned int error_class;
297 unsigned int initiator;
298 unsigned int severity;
302 static const struct mce_derror_table mce_p7_derror_table[] = {
304 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE, MCE_ECLASS_HARDWARE,
305 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
307 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
309 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
311 MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
312 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
314 MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
315 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
317 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
318 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
320 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE,
321 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
323 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_INDETERMINATE, /* BOTH */
324 MCE_ECLASS_HARD_INDETERMINATE,
325 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
326 { 0, false, 0, 0, 0, 0, 0 } };
328 static const struct mce_derror_table mce_p8_derror_table[] = {
330 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE, MCE_ECLASS_HARDWARE,
331 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
333 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
335 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
337 MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_LOAD_TIMEOUT, MCE_ECLASS_HARDWARE,
338 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
340 MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_PAGE_TABLE_WALK_LOAD_STORE_TIMEOUT,
342 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
344 MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
345 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
347 MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
348 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
350 MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, /* SECONDARY ERAT */
351 MCE_ECLASS_SOFT_INDETERMINATE,
352 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
354 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, /* Before PARITY */
355 MCE_ECLASS_SOFT_INDETERMINATE,
356 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
358 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE,
359 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
360 { 0, false, 0, 0, 0, 0, 0 } };
362 static const struct mce_derror_table mce_p9_derror_table[] = {
364 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE, MCE_ECLASS_HARDWARE,
365 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
367 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
369 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
371 MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_LOAD_TIMEOUT, MCE_ECLASS_HARDWARE,
372 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
374 MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_PAGE_TABLE_WALK_LOAD_STORE_TIMEOUT,
376 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
378 MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
379 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
381 MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
382 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
384 MCE_ERROR_TYPE_USER, MCE_USER_ERROR_TLBIE, MCE_ECLASS_SOFTWARE,
385 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
387 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, /* Before PARITY */
388 MCE_ECLASS_SOFT_INDETERMINATE,
389 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
391 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE,
392 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
394 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD, MCE_ECLASS_HARDWARE,
395 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
397 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
399 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
401 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE_FOREIGN,
403 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
405 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD_STORE_FOREIGN, MCE_ECLASS_HARDWARE,
406 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
407 { 0, false, 0, 0, 0, 0, 0 } };
409 static const struct mce_derror_table mce_p10_derror_table[] = {
411 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE, MCE_ECLASS_HARDWARE,
412 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
414 MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
416 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
418 MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
419 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
421 MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE,
422 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
424 MCE_ERROR_TYPE_USER, MCE_USER_ERROR_TLBIE, MCE_ECLASS_SOFTWARE,
425 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
427 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, /* Before PARITY */
428 MCE_ECLASS_SOFT_INDETERMINATE,
429 MCE_INITIATOR_CPU, MCE_SEV_WARNING, true },
431 MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE,
432 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
434 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD, MCE_ECLASS_HARDWARE,
435 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
437 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
439 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
441 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE_FOREIGN,
443 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
445 MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD_STORE_FOREIGN, MCE_ECLASS_HARDWARE,
446 MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true },
447 { 0, false, 0, 0, 0, 0, 0 } };
449 static int mce_find_instr_ea_and_phys(struct pt_regs *regs, uint64_t *addr,
453 * Carefully look at the NIP to determine
454 * the instruction to analyse. Reading the NIP
455 * in real-mode is tricky and can lead to recursive
458 struct ppc_inst instr;
459 unsigned long pfn, instr_addr;
460 struct instruction_op op;
461 struct pt_regs tmp = *regs;
463 pfn = addr_to_pfn(regs, regs->nip);
464 if (pfn != ULONG_MAX) {
465 instr_addr = (pfn << PAGE_SHIFT) + (regs->nip & ~PAGE_MASK);
466 instr = ppc_inst_read((u32 *)instr_addr);
467 if (!analyse_instr(&op, &tmp, instr)) {
468 pfn = addr_to_pfn(regs, op.ea);
470 *phys_addr = (pfn << PAGE_SHIFT);
474 * analyse_instr() might fail if the instruction
475 * is not a load/store, although this is unexpected
476 * for load/store errors or if we got the NIP
484 static int mce_handle_ierror(struct pt_regs *regs, unsigned long srr1,
485 const struct mce_ierror_table table[],
486 struct mce_error_info *mce_err, uint64_t *addr,
494 for (i = 0; table[i].srr1_mask; i++) {
495 if ((srr1 & table[i].srr1_mask) != table[i].srr1_value)
498 if (!mce_in_guest()) {
499 /* attempt to correct the error */
500 switch (table[i].error_type) {
501 case MCE_ERROR_TYPE_SLB:
502 if (local_paca->in_mce == 1)
503 slb_save_contents(local_paca->mce_faulty_slbs);
504 handled = mce_flush(MCE_FLUSH_SLB);
506 case MCE_ERROR_TYPE_ERAT:
507 handled = mce_flush(MCE_FLUSH_ERAT);
509 case MCE_ERROR_TYPE_TLB:
510 handled = mce_flush(MCE_FLUSH_TLB);
515 /* now fill in mce_error_info */
516 mce_err->error_type = table[i].error_type;
517 mce_err->error_class = table[i].error_class;
518 switch (table[i].error_type) {
519 case MCE_ERROR_TYPE_UE:
520 mce_err->u.ue_error_type = table[i].error_subtype;
522 case MCE_ERROR_TYPE_SLB:
523 mce_err->u.slb_error_type = table[i].error_subtype;
525 case MCE_ERROR_TYPE_ERAT:
526 mce_err->u.erat_error_type = table[i].error_subtype;
528 case MCE_ERROR_TYPE_TLB:
529 mce_err->u.tlb_error_type = table[i].error_subtype;
531 case MCE_ERROR_TYPE_USER:
532 mce_err->u.user_error_type = table[i].error_subtype;
534 case MCE_ERROR_TYPE_RA:
535 mce_err->u.ra_error_type = table[i].error_subtype;
537 case MCE_ERROR_TYPE_LINK:
538 mce_err->u.link_error_type = table[i].error_subtype;
541 mce_err->sync_error = table[i].sync_error;
542 mce_err->severity = table[i].severity;
543 mce_err->initiator = table[i].initiator;
544 if (table[i].nip_valid && !mce_in_guest()) {
546 if (mce_err->sync_error &&
547 table[i].error_type == MCE_ERROR_TYPE_UE) {
550 if (get_paca()->in_mce < MAX_MCE_DEPTH) {
551 pfn = addr_to_pfn(regs, regs->nip);
552 if (pfn != ULONG_MAX) {
562 mce_err->error_type = MCE_ERROR_TYPE_UNKNOWN;
563 mce_err->error_class = MCE_ECLASS_UNKNOWN;
564 mce_err->severity = MCE_SEV_SEVERE;
565 mce_err->initiator = MCE_INITIATOR_CPU;
566 mce_err->sync_error = true;
571 static int mce_handle_derror(struct pt_regs *regs,
572 const struct mce_derror_table table[],
573 struct mce_error_info *mce_err, uint64_t *addr,
576 uint64_t dsisr = regs->dsisr;
583 for (i = 0; table[i].dsisr_value; i++) {
584 if (!(dsisr & table[i].dsisr_value))
587 if (!mce_in_guest()) {
588 /* attempt to correct the error */
589 switch (table[i].error_type) {
590 case MCE_ERROR_TYPE_SLB:
591 if (local_paca->in_mce == 1)
592 slb_save_contents(local_paca->mce_faulty_slbs);
593 if (mce_flush(MCE_FLUSH_SLB))
596 case MCE_ERROR_TYPE_ERAT:
597 if (mce_flush(MCE_FLUSH_ERAT))
600 case MCE_ERROR_TYPE_TLB:
601 if (mce_flush(MCE_FLUSH_TLB))
608 * Attempt to handle multiple conditions, but only return
609 * one. Ensure uncorrectable errors are first in the table
615 /* now fill in mce_error_info */
616 mce_err->error_type = table[i].error_type;
617 mce_err->error_class = table[i].error_class;
618 switch (table[i].error_type) {
619 case MCE_ERROR_TYPE_UE:
620 mce_err->u.ue_error_type = table[i].error_subtype;
622 case MCE_ERROR_TYPE_SLB:
623 mce_err->u.slb_error_type = table[i].error_subtype;
625 case MCE_ERROR_TYPE_ERAT:
626 mce_err->u.erat_error_type = table[i].error_subtype;
628 case MCE_ERROR_TYPE_TLB:
629 mce_err->u.tlb_error_type = table[i].error_subtype;
631 case MCE_ERROR_TYPE_USER:
632 mce_err->u.user_error_type = table[i].error_subtype;
634 case MCE_ERROR_TYPE_RA:
635 mce_err->u.ra_error_type = table[i].error_subtype;
637 case MCE_ERROR_TYPE_LINK:
638 mce_err->u.link_error_type = table[i].error_subtype;
641 mce_err->sync_error = table[i].sync_error;
642 mce_err->severity = table[i].severity;
643 mce_err->initiator = table[i].initiator;
644 if (table[i].dar_valid)
646 else if (mce_err->sync_error && !mce_in_guest() &&
647 table[i].error_type == MCE_ERROR_TYPE_UE) {
649 * We do a maximum of 4 nested MCE calls, see
650 * kernel/exception-64s.h
652 if (get_paca()->in_mce < MAX_MCE_DEPTH)
653 mce_find_instr_ea_and_phys(regs, addr,
662 mce_err->error_type = MCE_ERROR_TYPE_UNKNOWN;
663 mce_err->error_class = MCE_ECLASS_UNKNOWN;
664 mce_err->severity = MCE_SEV_SEVERE;
665 mce_err->initiator = MCE_INITIATOR_CPU;
666 mce_err->sync_error = true;
671 static long mce_handle_ue_error(struct pt_regs *regs,
672 struct mce_error_info *mce_err)
677 mce_common_process_ue(regs, mce_err);
678 if (mce_err->ignore_event)
682 * On specific SCOM read via MMIO we may get a machine check
683 * exception with SRR0 pointing inside opal. If that is the
684 * case OPAL may have recovery address to re-read SCOM data in
685 * different way and hence we can recover from this MC.
688 if (ppc_md.mce_check_early_recovery) {
689 if (ppc_md.mce_check_early_recovery(regs))
696 static long mce_handle_error(struct pt_regs *regs,
698 const struct mce_derror_table dtable[],
699 const struct mce_ierror_table itable[])
701 struct mce_error_info mce_err = { 0 };
702 uint64_t addr, phys_addr = ULONG_MAX;
705 if (SRR1_MC_LOADSTORE(srr1))
706 handled = mce_handle_derror(regs, dtable, &mce_err, &addr,
709 handled = mce_handle_ierror(regs, srr1, itable, &mce_err, &addr,
712 if (!handled && mce_err.error_type == MCE_ERROR_TYPE_UE)
713 handled = mce_handle_ue_error(regs, &mce_err);
715 save_mce_event(regs, handled, &mce_err, regs->nip, addr, phys_addr);
720 long __machine_check_early_realmode_p7(struct pt_regs *regs)
722 /* P7 DD1 leaves top bits of DSISR undefined */
723 regs->dsisr &= 0x0000ffff;
725 return mce_handle_error(regs, regs->msr,
726 mce_p7_derror_table, mce_p7_ierror_table);
729 long __machine_check_early_realmode_p8(struct pt_regs *regs)
731 return mce_handle_error(regs, regs->msr,
732 mce_p8_derror_table, mce_p8_ierror_table);
735 long __machine_check_early_realmode_p9(struct pt_regs *regs)
737 unsigned long srr1 = regs->msr;
740 * On POWER9 DD2.1 and below, it's possible to get a machine check
741 * caused by a paste instruction where only DSISR bit 25 is set. This
742 * will result in the MCE handler seeing an unknown event and the kernel
743 * crashing. An MCE that occurs like this is spurious, so we don't need
744 * to do anything in terms of servicing it. If there is something that
745 * needs to be serviced, the CPU will raise the MCE again with the
746 * correct DSISR so that it can be serviced properly. So detect this
747 * case and mark it as handled.
749 if (SRR1_MC_LOADSTORE(regs->msr) && regs->dsisr == 0x02000000)
753 * Async machine check due to bad real address from store or foreign
754 * link time out comes with the load/store bit (PPC bit 42) set in
755 * SRR1, but the cause comes in SRR1 not DSISR. Clear bit 42 so we're
756 * directed to the ierror table so it will find the cause (which
757 * describes it correctly as a store error).
759 if (SRR1_MC_LOADSTORE(srr1) &&
760 ((srr1 & 0x081c0000) == 0x08140000 ||
761 (srr1 & 0x081c0000) == 0x08180000)) {
762 srr1 &= ~PPC_BIT(42);
765 return mce_handle_error(regs, srr1,
766 mce_p9_derror_table, mce_p9_ierror_table);
769 long __machine_check_early_realmode_p10(struct pt_regs *regs)
771 unsigned long srr1 = regs->msr;
774 * Async machine check due to bad real address from store comes with
775 * the load/store bit (PPC bit 42) set in SRR1, but the cause comes in
776 * SRR1 not DSISR. Clear bit 42 so we're directed to the ierror table
777 * so it will find the cause (which describes it correctly as a store
780 if (SRR1_MC_LOADSTORE(srr1) &&
781 (srr1 & 0x081c0000) == 0x08140000) {
782 srr1 &= ~PPC_BIT(42);
785 return mce_handle_error(regs, srr1,
786 mce_p10_derror_table, mce_p10_ierror_table);