1 // SPDX-License-Identifier: GPL-2.0-only
3 * (c) 2005-2016 Advanced Micro Devices, Inc.
5 * Written by Jacob Shin - AMD, Inc.
6 * Maintained by: Borislav Petkov <bp@alien8.de>
8 * All MC4_MISCi registers are shared between cores on a node.
10 #include <linux/interrupt.h>
11 #include <linux/notifier.h>
12 #include <linux/kobject.h>
13 #include <linux/percpu.h>
14 #include <linux/errno.h>
15 #include <linux/sched.h>
16 #include <linux/sysfs.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/cpu.h>
20 #include <linux/smp.h>
21 #include <linux/string.h>
23 #include <asm/amd_nb.h>
24 #include <asm/traps.h>
28 #include <asm/trace/irq_vectors.h>
33 #define THRESHOLD_MAX 0xFFF
34 #define INT_TYPE_APIC 0x00020000
35 #define MASK_VALID_HI 0x80000000
36 #define MASK_CNTP_HI 0x40000000
37 #define MASK_LOCKED_HI 0x20000000
38 #define MASK_LVTOFF_HI 0x00F00000
39 #define MASK_COUNT_EN_HI 0x00080000
40 #define MASK_INT_TYPE_HI 0x00060000
41 #define MASK_OVERFLOW_HI 0x00010000
42 #define MASK_ERR_COUNT_HI 0x00000FFF
43 #define MASK_BLKPTR_LO 0xFF000000
44 #define MCG_XBLK_ADDR 0xC0000400
46 /* Deferred error settings */
47 #define MSR_CU_DEF_ERR 0xC0000410
48 #define MASK_DEF_LVTOFF 0x000000F0
49 #define MASK_DEF_INT_TYPE 0x00000006
50 #define DEF_LVT_OFF 0x2
51 #define DEF_INT_TYPE_APIC 0x2
55 /* Threshold LVT offset is at MSR0xC0000410[15:12] */
56 #define SMCA_THR_LVT_OFF 0xF000
58 static bool thresholding_irq_en;
60 static const char * const th_names[] = {
69 static const char * const smca_umc_block_names[] = {
74 #define HWID_MCATYPE(hwid, mcatype) (((hwid) << 16) | (mcatype))
77 unsigned int bank_type; /* Use with smca_bank_types for easy indexing. */
78 u32 hwid_mcatype; /* (hwid,mcatype) tuple */
82 const struct smca_hwid *hwid;
83 u32 id; /* Value of MCA_IPID[InstanceId]. */
84 u8 sysfs_id; /* Value used for sysfs name. */
87 static DEFINE_PER_CPU_READ_MOSTLY(struct smca_bank[MAX_NR_BANKS], smca_banks);
88 static DEFINE_PER_CPU_READ_MOSTLY(u8[N_SMCA_BANK_TYPES], smca_bank_counts);
90 static const char * const smca_names[] = {
91 [SMCA_LS ... SMCA_LS_V2] = "load_store",
92 [SMCA_IF] = "insn_fetch",
93 [SMCA_L2_CACHE] = "l2_cache",
94 [SMCA_DE] = "decode_unit",
95 [SMCA_RESERVED] = "reserved",
96 [SMCA_EX] = "execution_unit",
97 [SMCA_FP] = "floating_point",
98 [SMCA_L3_CACHE] = "l3_cache",
99 [SMCA_CS ... SMCA_CS_V2] = "coherent_slave",
102 /* UMC v2 is separate because both of them can exist in a single system. */
104 [SMCA_UMC_V2] = "umc_v2",
105 [SMCA_MA_LLC] = "ma_llc",
106 [SMCA_PB] = "param_block",
107 [SMCA_PSP ... SMCA_PSP_V2] = "psp",
108 [SMCA_SMU ... SMCA_SMU_V2] = "smu",
110 [SMCA_MPDMA] = "mpdma",
111 [SMCA_NBIO] = "nbio",
112 [SMCA_PCIE ... SMCA_PCIE_V2] = "pcie",
113 [SMCA_XGMI_PCS] = "xgmi_pcs",
114 [SMCA_NBIF] = "nbif",
115 [SMCA_SHUB] = "shub",
116 [SMCA_SATA] = "sata",
118 [SMCA_USR_DP] = "usr_dp",
119 [SMCA_USR_CP] = "usr_cp",
120 [SMCA_GMI_PCS] = "gmi_pcs",
121 [SMCA_XGMI_PHY] = "xgmi_phy",
122 [SMCA_WAFL_PHY] = "wafl_phy",
123 [SMCA_GMI_PHY] = "gmi_phy",
126 static const char *smca_get_name(enum smca_bank_types t)
128 if (t >= N_SMCA_BANK_TYPES)
131 return smca_names[t];
134 enum smca_bank_types smca_get_bank_type(unsigned int cpu, unsigned int bank)
138 if (bank >= MAX_NR_BANKS)
139 return N_SMCA_BANK_TYPES;
141 b = &per_cpu(smca_banks, cpu)[bank];
143 return N_SMCA_BANK_TYPES;
145 return b->hwid->bank_type;
147 EXPORT_SYMBOL_GPL(smca_get_bank_type);
149 static const struct smca_hwid smca_hwid_mcatypes[] = {
150 /* { bank_type, hwid_mcatype } */
153 { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0) },
155 /* ZN Core (HWID=0xB0) MCA types */
156 { SMCA_LS, HWID_MCATYPE(0xB0, 0x0) },
157 { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10) },
158 { SMCA_IF, HWID_MCATYPE(0xB0, 0x1) },
159 { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2) },
160 { SMCA_DE, HWID_MCATYPE(0xB0, 0x3) },
161 /* HWID 0xB0 MCATYPE 0x4 is Reserved */
162 { SMCA_EX, HWID_MCATYPE(0xB0, 0x5) },
163 { SMCA_FP, HWID_MCATYPE(0xB0, 0x6) },
164 { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7) },
166 /* Data Fabric MCA types */
167 { SMCA_CS, HWID_MCATYPE(0x2E, 0x0) },
168 { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1) },
169 { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2) },
170 { SMCA_MA_LLC, HWID_MCATYPE(0x2E, 0x4) },
172 /* Unified Memory Controller MCA type */
173 { SMCA_UMC, HWID_MCATYPE(0x96, 0x0) },
174 { SMCA_UMC_V2, HWID_MCATYPE(0x96, 0x1) },
176 /* Parameter Block MCA type */
177 { SMCA_PB, HWID_MCATYPE(0x05, 0x0) },
179 /* Platform Security Processor MCA type */
180 { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0) },
181 { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1) },
183 /* System Management Unit MCA type */
184 { SMCA_SMU, HWID_MCATYPE(0x01, 0x0) },
185 { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1) },
187 /* Microprocessor 5 Unit MCA type */
188 { SMCA_MP5, HWID_MCATYPE(0x01, 0x2) },
191 { SMCA_MPDMA, HWID_MCATYPE(0x01, 0x3) },
193 /* Northbridge IO Unit MCA type */
194 { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0) },
196 /* PCI Express Unit MCA type */
197 { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0) },
198 { SMCA_PCIE_V2, HWID_MCATYPE(0x46, 0x1) },
200 { SMCA_XGMI_PCS, HWID_MCATYPE(0x50, 0x0) },
201 { SMCA_NBIF, HWID_MCATYPE(0x6C, 0x0) },
202 { SMCA_SHUB, HWID_MCATYPE(0x80, 0x0) },
203 { SMCA_SATA, HWID_MCATYPE(0xA8, 0x0) },
204 { SMCA_USB, HWID_MCATYPE(0xAA, 0x0) },
205 { SMCA_USR_DP, HWID_MCATYPE(0x170, 0x0) },
206 { SMCA_USR_CP, HWID_MCATYPE(0x180, 0x0) },
207 { SMCA_GMI_PCS, HWID_MCATYPE(0x241, 0x0) },
208 { SMCA_XGMI_PHY, HWID_MCATYPE(0x259, 0x0) },
209 { SMCA_WAFL_PHY, HWID_MCATYPE(0x267, 0x0) },
210 { SMCA_GMI_PHY, HWID_MCATYPE(0x269, 0x0) },
214 * In SMCA enabled processors, we can have multiple banks for a given IP type.
215 * So to define a unique name for each bank, we use a temp c-string to append
216 * the MCA_IPID[InstanceId] to type's name in get_name().
218 * InstanceId is 32 bits which is 8 characters. Make sure MAX_MCATYPE_NAME_LEN
219 * is greater than 8 plus 1 (for underscore) plus length of longest type name.
221 #define MAX_MCATYPE_NAME_LEN 30
222 static char buf_mcatype[MAX_MCATYPE_NAME_LEN];
224 static DEFINE_PER_CPU(struct threshold_bank **, threshold_banks);
227 * A list of the banks enabled on each logical CPU. Controls which respective
228 * descriptors to initialize later in mce_threshold_create_device().
230 static DEFINE_PER_CPU(u64, bank_map);
232 /* Map of banks that have more than MCA_MISC0 available. */
233 static DEFINE_PER_CPU(u64, smca_misc_banks_map);
235 static void amd_threshold_interrupt(void);
236 static void amd_deferred_error_interrupt(void);
238 static void default_deferred_error_interrupt(void)
240 pr_err("Unexpected deferred interrupt at vector %x\n", DEFERRED_ERROR_VECTOR);
242 void (*deferred_error_int_vector)(void) = default_deferred_error_interrupt;
244 static void smca_set_misc_banks_map(unsigned int bank, unsigned int cpu)
249 * For SMCA enabled processors, BLKPTR field of the first MISC register
250 * (MCx_MISC0) indicates presence of additional MISC regs set (MISC1-4).
252 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high))
255 if (!(low & MCI_CONFIG_MCAX))
258 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high))
261 if (low & MASK_BLKPTR_LO)
262 per_cpu(smca_misc_banks_map, cpu) |= BIT_ULL(bank);
266 static void smca_configure(unsigned int bank, unsigned int cpu)
268 u8 *bank_counts = this_cpu_ptr(smca_bank_counts);
269 const struct smca_hwid *s_hwid;
270 unsigned int i, hwid_mcatype;
272 u32 smca_config = MSR_AMD64_SMCA_MCx_CONFIG(bank);
274 /* Set appropriate bits in MCA_CONFIG */
275 if (!rdmsr_safe(smca_config, &low, &high)) {
277 * OS is required to set the MCAX bit to acknowledge that it is
278 * now using the new MSR ranges and new registers under each
279 * bank. It also means that the OS will configure deferred
280 * errors in the new MCx_CONFIG register. If the bit is not set,
281 * uncorrectable errors will cause a system panic.
283 * MCA_CONFIG[MCAX] is bit 32 (0 in the high portion of the MSR.)
288 * SMCA sets the Deferred Error Interrupt type per bank.
290 * MCA_CONFIG[DeferredIntTypeSupported] is bit 5, and tells us
291 * if the DeferredIntType bit field is available.
293 * MCA_CONFIG[DeferredIntType] is bits [38:37] ([6:5] in the
294 * high portion of the MSR). OS should set this to 0x1 to enable
295 * APIC based interrupt. First, check that no interrupt has been
298 if ((low & BIT(5)) && !((high >> 5) & 0x3))
301 this_cpu_ptr(mce_banks_array)[bank].lsb_in_status = !!(low & BIT(8));
303 wrmsr(smca_config, low, high);
306 smca_set_misc_banks_map(bank, cpu);
308 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) {
309 pr_warn("Failed to read MCA_IPID for bank %d\n", bank);
313 hwid_mcatype = HWID_MCATYPE(high & MCI_IPID_HWID,
314 (high & MCI_IPID_MCATYPE) >> 16);
316 for (i = 0; i < ARRAY_SIZE(smca_hwid_mcatypes); i++) {
317 s_hwid = &smca_hwid_mcatypes[i];
319 if (hwid_mcatype == s_hwid->hwid_mcatype) {
320 this_cpu_ptr(smca_banks)[bank].hwid = s_hwid;
321 this_cpu_ptr(smca_banks)[bank].id = low;
322 this_cpu_ptr(smca_banks)[bank].sysfs_id = bank_counts[s_hwid->bank_type]++;
328 struct thresh_restart {
329 struct threshold_block *b;
336 static inline bool is_shared_bank(int bank)
339 * Scalable MCA provides for only one core to have access to the MSRs of
345 /* Bank 4 is for northbridge reporting and is thus shared */
349 static const char *bank4_names(const struct threshold_block *b)
351 switch (b->address) {
363 WARN(1, "Funny MSR: 0x%08x\n", b->address);
369 static bool lvt_interrupt_supported(unsigned int bank, u32 msr_high_bits)
372 * bank 4 supports APIC LVT interrupts implicitly since forever.
378 * IntP: interrupt present; if this bit is set, the thresholding
379 * bank can generate APIC LVT interrupts
381 return msr_high_bits & BIT(28);
384 static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi)
386 int msr = (hi & MASK_LVTOFF_HI) >> 20;
389 pr_err(FW_BUG "cpu %d, failed to setup threshold interrupt "
390 "for bank %d, block %d (MSR%08X=0x%x%08x)\n", b->cpu,
391 b->bank, b->block, b->address, hi, lo);
397 * On SMCA CPUs, LVT offset is programmed at a different MSR, and
398 * the BIOS provides the value. The original field where LVT offset
399 * was set is reserved. Return early here:
404 pr_err(FW_BUG "cpu %d, invalid threshold interrupt offset %d "
405 "for bank %d, block %d (MSR%08X=0x%x%08x)\n",
406 b->cpu, apic, b->bank, b->block, b->address, hi, lo);
413 /* Reprogram MCx_MISC MSR behind this threshold bank. */
414 static void threshold_restart_bank(void *_tr)
416 struct thresh_restart *tr = _tr;
419 /* sysfs write might race against an offline operation */
420 if (!this_cpu_read(threshold_banks) && !tr->set_lvt_off)
423 rdmsr(tr->b->address, lo, hi);
425 if (tr->b->threshold_limit < (hi & THRESHOLD_MAX))
426 tr->reset = 1; /* limit cannot be lower than err count */
428 if (tr->reset) { /* reset err count and overflow bit */
430 (hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) |
431 (THRESHOLD_MAX - tr->b->threshold_limit);
432 } else if (tr->old_limit) { /* change limit w/o reset */
433 int new_count = (hi & THRESHOLD_MAX) +
434 (tr->old_limit - tr->b->threshold_limit);
436 hi = (hi & ~MASK_ERR_COUNT_HI) |
437 (new_count & THRESHOLD_MAX);
441 hi &= ~MASK_INT_TYPE_HI;
443 if (!tr->b->interrupt_capable)
446 if (tr->set_lvt_off) {
447 if (lvt_off_valid(tr->b, tr->lvt_off, lo, hi)) {
448 /* set new lvt offset */
449 hi &= ~MASK_LVTOFF_HI;
450 hi |= tr->lvt_off << 20;
454 if (tr->b->interrupt_enable)
459 hi |= MASK_COUNT_EN_HI;
460 wrmsr(tr->b->address, lo, hi);
463 static void mce_threshold_block_init(struct threshold_block *b, int offset)
465 struct thresh_restart tr = {
471 b->threshold_limit = THRESHOLD_MAX;
472 threshold_restart_bank(&tr);
475 static int setup_APIC_mce_threshold(int reserved, int new)
477 if (reserved < 0 && !setup_APIC_eilvt(new, THRESHOLD_APIC_VECTOR,
478 APIC_EILVT_MSG_FIX, 0))
484 static int setup_APIC_deferred_error(int reserved, int new)
486 if (reserved < 0 && !setup_APIC_eilvt(new, DEFERRED_ERROR_VECTOR,
487 APIC_EILVT_MSG_FIX, 0))
493 static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c)
495 u32 low = 0, high = 0;
496 int def_offset = -1, def_new;
498 if (rdmsr_safe(MSR_CU_DEF_ERR, &low, &high))
501 def_new = (low & MASK_DEF_LVTOFF) >> 4;
502 if (!(low & MASK_DEF_LVTOFF)) {
503 pr_err(FW_BUG "Your BIOS is not setting up LVT offset 0x2 for deferred error IRQs correctly.\n");
504 def_new = DEF_LVT_OFF;
505 low = (low & ~MASK_DEF_LVTOFF) | (DEF_LVT_OFF << 4);
508 def_offset = setup_APIC_deferred_error(def_offset, def_new);
509 if ((def_offset == def_new) &&
510 (deferred_error_int_vector != amd_deferred_error_interrupt))
511 deferred_error_int_vector = amd_deferred_error_interrupt;
514 low = (low & ~MASK_DEF_INT_TYPE) | DEF_INT_TYPE_APIC;
516 wrmsr(MSR_CU_DEF_ERR, low, high);
519 static u32 smca_get_block_address(unsigned int bank, unsigned int block,
523 return MSR_AMD64_SMCA_MCx_MISC(bank);
525 if (!(per_cpu(smca_misc_banks_map, cpu) & BIT_ULL(bank)))
528 return MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1);
531 static u32 get_block_address(u32 current_addr, u32 low, u32 high,
532 unsigned int bank, unsigned int block,
535 u32 addr = 0, offset = 0;
537 if ((bank >= per_cpu(mce_num_banks, cpu)) || (block >= NR_BLOCKS))
541 return smca_get_block_address(bank, block, cpu);
543 /* Fall back to method we used for older processors: */
546 addr = mca_msr_reg(bank, MCA_MISC);
549 offset = ((low & MASK_BLKPTR_LO) >> 21);
551 addr = MCG_XBLK_ADDR + offset;
554 addr = ++current_addr;
560 prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr,
561 int offset, u32 misc_high)
563 unsigned int cpu = smp_processor_id();
564 u32 smca_low, smca_high;
565 struct threshold_block b;
569 per_cpu(bank_map, cpu) |= BIT_ULL(bank);
571 memset(&b, 0, sizeof(b));
576 b.interrupt_capable = lvt_interrupt_supported(bank, misc_high);
578 if (!b.interrupt_capable)
581 b.interrupt_enable = 1;
583 if (!mce_flags.smca) {
584 new = (misc_high & MASK_LVTOFF_HI) >> 20;
588 /* Gather LVT offset for thresholding: */
589 if (rdmsr_safe(MSR_CU_DEF_ERR, &smca_low, &smca_high))
592 new = (smca_low & SMCA_THR_LVT_OFF) >> 12;
595 offset = setup_APIC_mce_threshold(offset, new);
597 thresholding_irq_en = true;
600 mce_threshold_block_init(&b, offset);
606 bool amd_filter_mce(struct mce *m)
608 enum smca_bank_types bank_type = smca_get_bank_type(m->extcpu, m->bank);
609 struct cpuinfo_x86 *c = &boot_cpu_data;
611 /* See Family 17h Models 10h-2Fh Erratum #1114. */
612 if (c->x86 == 0x17 &&
613 c->x86_model >= 0x10 && c->x86_model <= 0x2F &&
614 bank_type == SMCA_IF && XEC(m->status, 0x3f) == 10)
617 /* NB GART TLB error reporting is disabled by default. */
619 if (m->bank == 4 && XEC(m->status, 0x1f) == 0x5)
627 * Turn off thresholding banks for the following conditions:
628 * - MC4_MISC thresholding is not supported on Family 0x15.
629 * - Prevent possible spurious interrupts from the IF bank on Family 0x17
630 * Models 0x10-0x2F due to Erratum #1114.
632 static void disable_err_thresholding(struct cpuinfo_x86 *c, unsigned int bank)
639 if (c->x86 == 0x15 && bank == 4) {
640 msrs[0] = 0x00000413; /* MC4_MISC0 */
641 msrs[1] = 0xc0000408; /* MC4_MISC1 */
643 } else if (c->x86 == 0x17 &&
644 (c->x86_model >= 0x10 && c->x86_model <= 0x2F)) {
646 if (smca_get_bank_type(smp_processor_id(), bank) != SMCA_IF)
649 msrs[0] = MSR_AMD64_SMCA_MCx_MISC(bank);
655 rdmsrl(MSR_K7_HWCR, hwcr);
657 /* McStatusWrEn has to be set */
658 need_toggle = !(hwcr & BIT(18));
660 wrmsrl(MSR_K7_HWCR, hwcr | BIT(18));
662 /* Clear CntP bit safely */
663 for (i = 0; i < num_msrs; i++)
664 msr_clear_bit(msrs[i], 62);
666 /* restore old settings */
668 wrmsrl(MSR_K7_HWCR, hwcr);
671 /* cpu init entry point, called from mce.c with preempt off */
672 void mce_amd_feature_init(struct cpuinfo_x86 *c)
674 unsigned int bank, block, cpu = smp_processor_id();
675 u32 low = 0, high = 0, address = 0;
679 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) {
681 smca_configure(bank, cpu);
683 disable_err_thresholding(c, bank);
685 for (block = 0; block < NR_BLOCKS; ++block) {
686 address = get_block_address(address, low, high, bank, block, cpu);
690 if (rdmsr_safe(address, &low, &high))
693 if (!(high & MASK_VALID_HI))
696 if (!(high & MASK_CNTP_HI) ||
697 (high & MASK_LOCKED_HI))
700 offset = prepare_threshold_block(bank, block, address, offset, high);
704 if (mce_flags.succor)
705 deferred_error_interrupt_enable(c);
709 * DRAM ECC errors are reported in the Northbridge (bank 4) with
710 * Extended Error Code 8.
712 static bool legacy_mce_is_memory_error(struct mce *m)
714 return m->bank == 4 && XEC(m->status, 0x1f) == 8;
718 * DRAM ECC errors are reported in Unified Memory Controllers with
719 * Extended Error Code 0.
721 static bool smca_mce_is_memory_error(struct mce *m)
723 enum smca_bank_types bank_type;
725 if (XEC(m->status, 0x3f))
728 bank_type = smca_get_bank_type(m->extcpu, m->bank);
730 return bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2;
733 bool amd_mce_is_memory_error(struct mce *m)
736 return smca_mce_is_memory_error(m);
738 return legacy_mce_is_memory_error(m);
742 * AMD systems do not have an explicit indicator that the value in MCA_ADDR is
743 * a system physical address. Therefore, individual cases need to be detected.
744 * Future cases and checks will be added as needed.
747 * a) Assume address is not usable.
749 * a) Indicated by MCA_STATUS[43]: poison. Defined for all banks except legacy
750 * northbridge (bank 4).
751 * b) Refers to poison consumption in the core. Does not include "no action",
752 * "action optional", or "deferred" error severities.
753 * c) Will include a usable address so that immediate action can be taken.
754 * 3) Northbridge DRAM ECC errors
755 * a) Reported in legacy bank 4 with extended error code (XEC) 8.
756 * b) MCA_STATUS[43] is *not* defined as poison in legacy bank 4. Therefore,
757 * this bit should not be checked.
759 * NOTE: SMCA UMC memory errors fall into case #1.
761 bool amd_mce_usable_address(struct mce *m)
763 /* Check special northbridge case 3) first. */
764 if (!mce_flags.smca) {
765 if (legacy_mce_is_memory_error(m))
767 else if (m->bank == 4)
771 /* Check poison bit for all other bank types. */
772 if (m->status & MCI_STATUS_POISON)
775 /* Assume address is not usable for all others. */
779 static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc)
790 if (m.status & MCI_STATUS_ADDRV) {
793 smca_extract_err_addr(&m);
796 if (mce_flags.smca) {
797 rdmsrl(MSR_AMD64_SMCA_MCx_IPID(bank), m.ipid);
799 if (m.status & MCI_STATUS_SYNDV)
800 rdmsrl(MSR_AMD64_SMCA_MCx_SYND(bank), m.synd);
806 DEFINE_IDTENTRY_SYSVEC(sysvec_deferred_error)
808 trace_deferred_error_apic_entry(DEFERRED_ERROR_VECTOR);
809 inc_irq_stat(irq_deferred_error_count);
810 deferred_error_int_vector();
811 trace_deferred_error_apic_exit(DEFERRED_ERROR_VECTOR);
816 * Returns true if the logged error is deferred. False, otherwise.
819 _log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc)
821 u64 status, addr = 0;
823 rdmsrl(msr_stat, status);
824 if (!(status & MCI_STATUS_VAL))
827 if (status & MCI_STATUS_ADDRV)
828 rdmsrl(msr_addr, addr);
830 __log_error(bank, status, addr, misc);
834 return status & MCI_STATUS_DEFERRED;
837 static bool _log_error_deferred(unsigned int bank, u32 misc)
839 if (!_log_error_bank(bank, mca_msr_reg(bank, MCA_STATUS),
840 mca_msr_reg(bank, MCA_ADDR), misc))
844 * Non-SMCA systems don't have MCA_DESTAT/MCA_DEADDR registers.
845 * Return true here to avoid accessing these registers.
850 /* Clear MCA_DESTAT if the deferred error was logged from MCA_STATUS. */
851 wrmsrl(MSR_AMD64_SMCA_MCx_DESTAT(bank), 0);
856 * We have three scenarios for checking for Deferred errors:
858 * 1) Non-SMCA systems check MCA_STATUS and log error if found.
859 * 2) SMCA systems check MCA_STATUS. If error is found then log it and also
861 * 3) SMCA systems check MCA_DESTAT, if error was not found in MCA_STATUS, and
864 static void log_error_deferred(unsigned int bank)
866 if (_log_error_deferred(bank, 0))
870 * Only deferred errors are logged in MCA_DE{STAT,ADDR} so just check
873 _log_error_bank(bank, MSR_AMD64_SMCA_MCx_DESTAT(bank),
874 MSR_AMD64_SMCA_MCx_DEADDR(bank), 0);
877 /* APIC interrupt handler for deferred errors */
878 static void amd_deferred_error_interrupt(void)
882 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank)
883 log_error_deferred(bank);
886 static void log_error_thresholding(unsigned int bank, u64 misc)
888 _log_error_deferred(bank, misc);
891 static void log_and_reset_block(struct threshold_block *block)
893 struct thresh_restart tr;
894 u32 low = 0, high = 0;
899 if (rdmsr_safe(block->address, &low, &high))
902 if (!(high & MASK_OVERFLOW_HI))
905 /* Log the MCE which caused the threshold event. */
906 log_error_thresholding(block->bank, ((u64)high << 32) | low);
908 /* Reset threshold block after logging error. */
909 memset(&tr, 0, sizeof(tr));
911 threshold_restart_bank(&tr);
915 * Threshold interrupt handler will service THRESHOLD_APIC_VECTOR. The interrupt
916 * goes off when error_count reaches threshold_limit.
918 static void amd_threshold_interrupt(void)
920 struct threshold_block *first_block = NULL, *block = NULL, *tmp = NULL;
921 struct threshold_bank **bp = this_cpu_read(threshold_banks);
922 unsigned int bank, cpu = smp_processor_id();
925 * Validate that the threshold bank has been initialized already. The
926 * handler is installed at boot time, but on a hotplug event the
927 * interrupt might fire before the data has been initialized.
932 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) {
933 if (!(per_cpu(bank_map, cpu) & BIT_ULL(bank)))
936 first_block = bp[bank]->blocks;
941 * The first block is also the head of the list. Check it first
942 * before iterating over the rest.
944 log_and_reset_block(first_block);
945 list_for_each_entry_safe(block, tmp, &first_block->miscj, miscj)
946 log_and_reset_block(block);
954 struct threshold_attr {
955 struct attribute attr;
956 ssize_t (*show) (struct threshold_block *, char *);
957 ssize_t (*store) (struct threshold_block *, const char *, size_t count);
960 #define SHOW_FIELDS(name) \
961 static ssize_t show_ ## name(struct threshold_block *b, char *buf) \
963 return sprintf(buf, "%lu\n", (unsigned long) b->name); \
965 SHOW_FIELDS(interrupt_enable)
966 SHOW_FIELDS(threshold_limit)
969 store_interrupt_enable(struct threshold_block *b, const char *buf, size_t size)
971 struct thresh_restart tr;
974 if (!b->interrupt_capable)
977 if (kstrtoul(buf, 0, &new) < 0)
980 b->interrupt_enable = !!new;
982 memset(&tr, 0, sizeof(tr));
985 if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1))
992 store_threshold_limit(struct threshold_block *b, const char *buf, size_t size)
994 struct thresh_restart tr;
997 if (kstrtoul(buf, 0, &new) < 0)
1000 if (new > THRESHOLD_MAX)
1001 new = THRESHOLD_MAX;
1005 memset(&tr, 0, sizeof(tr));
1006 tr.old_limit = b->threshold_limit;
1007 b->threshold_limit = new;
1010 if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1))
1016 static ssize_t show_error_count(struct threshold_block *b, char *buf)
1020 /* CPU might be offline by now */
1021 if (rdmsr_on_cpu(b->cpu, b->address, &lo, &hi))
1024 return sprintf(buf, "%u\n", ((hi & THRESHOLD_MAX) -
1025 (THRESHOLD_MAX - b->threshold_limit)));
1028 static struct threshold_attr error_count = {
1029 .attr = {.name = __stringify(error_count), .mode = 0444 },
1030 .show = show_error_count,
1033 #define RW_ATTR(val) \
1034 static struct threshold_attr val = { \
1035 .attr = {.name = __stringify(val), .mode = 0644 }, \
1036 .show = show_## val, \
1037 .store = store_## val, \
1040 RW_ATTR(interrupt_enable);
1041 RW_ATTR(threshold_limit);
1043 static struct attribute *default_attrs[] = {
1044 &threshold_limit.attr,
1046 NULL, /* possibly interrupt_enable if supported, see below */
1049 ATTRIBUTE_GROUPS(default);
1051 #define to_block(k) container_of(k, struct threshold_block, kobj)
1052 #define to_attr(a) container_of(a, struct threshold_attr, attr)
1054 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
1056 struct threshold_block *b = to_block(kobj);
1057 struct threshold_attr *a = to_attr(attr);
1060 ret = a->show ? a->show(b, buf) : -EIO;
1065 static ssize_t store(struct kobject *kobj, struct attribute *attr,
1066 const char *buf, size_t count)
1068 struct threshold_block *b = to_block(kobj);
1069 struct threshold_attr *a = to_attr(attr);
1072 ret = a->store ? a->store(b, buf, count) : -EIO;
1077 static const struct sysfs_ops threshold_ops = {
1082 static void threshold_block_release(struct kobject *kobj);
1084 static const struct kobj_type threshold_ktype = {
1085 .sysfs_ops = &threshold_ops,
1086 .default_groups = default_groups,
1087 .release = threshold_block_release,
1090 static const char *get_name(unsigned int cpu, unsigned int bank, struct threshold_block *b)
1092 enum smca_bank_types bank_type;
1094 if (!mce_flags.smca) {
1096 return bank4_names(b);
1098 return th_names[bank];
1101 bank_type = smca_get_bank_type(cpu, bank);
1102 if (bank_type >= N_SMCA_BANK_TYPES)
1105 if (b && (bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2)) {
1106 if (b->block < ARRAY_SIZE(smca_umc_block_names))
1107 return smca_umc_block_names[b->block];
1111 if (per_cpu(smca_bank_counts, cpu)[bank_type] == 1)
1112 return smca_get_name(bank_type);
1114 snprintf(buf_mcatype, MAX_MCATYPE_NAME_LEN,
1115 "%s_%u", smca_get_name(bank_type),
1116 per_cpu(smca_banks, cpu)[bank].sysfs_id);
1120 static int allocate_threshold_blocks(unsigned int cpu, struct threshold_bank *tb,
1121 unsigned int bank, unsigned int block,
1124 struct threshold_block *b = NULL;
1128 if ((bank >= this_cpu_read(mce_num_banks)) || (block >= NR_BLOCKS))
1131 if (rdmsr_safe(address, &low, &high))
1134 if (!(high & MASK_VALID_HI)) {
1141 if (!(high & MASK_CNTP_HI) ||
1142 (high & MASK_LOCKED_HI))
1145 b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL);
1152 b->address = address;
1153 b->interrupt_enable = 0;
1154 b->interrupt_capable = lvt_interrupt_supported(bank, high);
1155 b->threshold_limit = THRESHOLD_MAX;
1157 if (b->interrupt_capable) {
1158 default_attrs[2] = &interrupt_enable.attr;
1159 b->interrupt_enable = 1;
1161 default_attrs[2] = NULL;
1164 INIT_LIST_HEAD(&b->miscj);
1166 /* This is safe as @tb is not visible yet */
1168 list_add(&b->miscj, &tb->blocks->miscj);
1172 err = kobject_init_and_add(&b->kobj, &threshold_ktype, tb->kobj, get_name(cpu, bank, b));
1176 address = get_block_address(address, low, high, bank, ++block, cpu);
1180 err = allocate_threshold_blocks(cpu, tb, bank, block, address);
1185 kobject_uevent(&b->kobj, KOBJ_ADD);
1191 list_del(&b->miscj);
1192 kobject_put(&b->kobj);
1197 static int __threshold_add_blocks(struct threshold_bank *b)
1199 struct list_head *head = &b->blocks->miscj;
1200 struct threshold_block *pos = NULL;
1201 struct threshold_block *tmp = NULL;
1204 err = kobject_add(&b->blocks->kobj, b->kobj, b->blocks->kobj.name);
1208 list_for_each_entry_safe(pos, tmp, head, miscj) {
1210 err = kobject_add(&pos->kobj, b->kobj, pos->kobj.name);
1212 list_for_each_entry_safe_reverse(pos, tmp, head, miscj)
1213 kobject_del(&pos->kobj);
1221 static int threshold_create_bank(struct threshold_bank **bp, unsigned int cpu,
1224 struct device *dev = this_cpu_read(mce_device);
1225 struct amd_northbridge *nb = NULL;
1226 struct threshold_bank *b = NULL;
1227 const char *name = get_name(cpu, bank, NULL);
1233 if (is_shared_bank(bank)) {
1234 nb = node_to_amd_nb(topology_amd_node_id(cpu));
1236 /* threshold descriptor already initialized on this node? */
1237 if (nb && nb->bank4) {
1240 err = kobject_add(b->kobj, &dev->kobj, name);
1245 refcount_inc(&b->cpus);
1247 err = __threshold_add_blocks(b);
1253 b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL);
1259 /* Associate the bank with the per-CPU MCE device */
1260 b->kobj = kobject_create_and_add(name, &dev->kobj);
1266 if (is_shared_bank(bank)) {
1268 refcount_set(&b->cpus, 1);
1270 /* nb is already initialized, see above */
1277 err = allocate_threshold_blocks(cpu, b, bank, 0, mca_msr_reg(bank, MCA_MISC));
1285 kobject_put(b->kobj);
1292 static void threshold_block_release(struct kobject *kobj)
1294 kfree(to_block(kobj));
1297 static void deallocate_threshold_blocks(struct threshold_bank *bank)
1299 struct threshold_block *pos, *tmp;
1301 list_for_each_entry_safe(pos, tmp, &bank->blocks->miscj, miscj) {
1302 list_del(&pos->miscj);
1303 kobject_put(&pos->kobj);
1306 kobject_put(&bank->blocks->kobj);
1309 static void __threshold_remove_blocks(struct threshold_bank *b)
1311 struct threshold_block *pos = NULL;
1312 struct threshold_block *tmp = NULL;
1314 kobject_put(b->kobj);
1316 list_for_each_entry_safe(pos, tmp, &b->blocks->miscj, miscj)
1317 kobject_put(b->kobj);
1320 static void threshold_remove_bank(struct threshold_bank *bank)
1322 struct amd_northbridge *nb;
1330 if (!refcount_dec_and_test(&bank->cpus)) {
1331 __threshold_remove_blocks(bank);
1335 * The last CPU on this node using the shared bank is going
1336 * away, remove that bank now.
1338 nb = node_to_amd_nb(topology_amd_node_id(smp_processor_id()));
1343 deallocate_threshold_blocks(bank);
1346 kobject_put(bank->kobj);
1350 static void __threshold_remove_device(struct threshold_bank **bp)
1352 unsigned int bank, numbanks = this_cpu_read(mce_num_banks);
1354 for (bank = 0; bank < numbanks; bank++) {
1358 threshold_remove_bank(bp[bank]);
1364 int mce_threshold_remove_device(unsigned int cpu)
1366 struct threshold_bank **bp = this_cpu_read(threshold_banks);
1372 * Clear the pointer before cleaning up, so that the interrupt won't
1373 * touch anything of this.
1375 this_cpu_write(threshold_banks, NULL);
1377 __threshold_remove_device(bp);
1382 * mce_threshold_create_device - Create the per-CPU MCE threshold device
1383 * @cpu: The plugged in CPU
1385 * Create directories and files for all valid threshold banks.
1387 * This is invoked from the CPU hotplug callback which was installed in
1388 * mcheck_init_device(). The invocation happens in context of the hotplug
1389 * thread running on @cpu. The callback is invoked on all CPUs which are
1390 * online when the callback is installed or during a real hotplug event.
1392 int mce_threshold_create_device(unsigned int cpu)
1394 unsigned int numbanks, bank;
1395 struct threshold_bank **bp;
1398 if (!mce_flags.amd_threshold)
1401 bp = this_cpu_read(threshold_banks);
1405 numbanks = this_cpu_read(mce_num_banks);
1406 bp = kcalloc(numbanks, sizeof(*bp), GFP_KERNEL);
1410 for (bank = 0; bank < numbanks; ++bank) {
1411 if (!(this_cpu_read(bank_map) & BIT_ULL(bank)))
1413 err = threshold_create_bank(bp, cpu, bank);
1415 __threshold_remove_device(bp);
1419 this_cpu_write(threshold_banks, bp);
1421 if (thresholding_irq_en)
1422 mce_threshold_vector = amd_threshold_interrupt;