2 * (c) 2005-2016 Advanced Micro Devices, Inc.
3 * Your use of this code is subject to the terms and conditions of the
4 * GNU general public license version 2. See "COPYING" or
5 * http://www.gnu.org/licenses/gpl.html
7 * Written by Jacob Shin - AMD, Inc.
8 * Maintained by: Borislav Petkov <bp@alien8.de>
10 * All MC4_MISCi registers are shared between cores on a node.
12 #include <linux/interrupt.h>
13 #include <linux/notifier.h>
14 #include <linux/kobject.h>
15 #include <linux/percpu.h>
16 #include <linux/errno.h>
17 #include <linux/sched.h>
18 #include <linux/sysfs.h>
19 #include <linux/slab.h>
20 #include <linux/init.h>
21 #include <linux/cpu.h>
22 #include <linux/smp.h>
23 #include <linux/string.h>
25 #include <asm/amd_nb.h>
29 #include <asm/trace/irq_vectors.h>
31 #include "mce-internal.h"
34 #define THRESHOLD_MAX 0xFFF
35 #define INT_TYPE_APIC 0x00020000
36 #define MASK_VALID_HI 0x80000000
37 #define MASK_CNTP_HI 0x40000000
38 #define MASK_LOCKED_HI 0x20000000
39 #define MASK_LVTOFF_HI 0x00F00000
40 #define MASK_COUNT_EN_HI 0x00080000
41 #define MASK_INT_TYPE_HI 0x00060000
42 #define MASK_OVERFLOW_HI 0x00010000
43 #define MASK_ERR_COUNT_HI 0x00000FFF
44 #define MASK_BLKPTR_LO 0xFF000000
45 #define MCG_XBLK_ADDR 0xC0000400
47 /* Deferred error settings */
48 #define MSR_CU_DEF_ERR 0xC0000410
49 #define MASK_DEF_LVTOFF 0x000000F0
50 #define MASK_DEF_INT_TYPE 0x00000006
51 #define DEF_LVT_OFF 0x2
52 #define DEF_INT_TYPE_APIC 0x2
56 /* Threshold LVT offset is at MSR0xC0000410[15:12] */
57 #define SMCA_THR_LVT_OFF 0xF000
59 static bool thresholding_en;
61 static const char * const th_names[] = {
70 static const char * const smca_umc_block_names[] = {
75 struct smca_bank_name {
76 const char *name; /* Short name for sysfs */
77 const char *long_name; /* Long name for pretty-printing */
80 static struct smca_bank_name smca_names[] = {
81 [SMCA_LS] = { "load_store", "Load Store Unit" },
82 [SMCA_IF] = { "insn_fetch", "Instruction Fetch Unit" },
83 [SMCA_L2_CACHE] = { "l2_cache", "L2 Cache" },
84 [SMCA_DE] = { "decode_unit", "Decode Unit" },
85 [SMCA_RESERVED] = { "reserved", "Reserved" },
86 [SMCA_EX] = { "execution_unit", "Execution Unit" },
87 [SMCA_FP] = { "floating_point", "Floating Point Unit" },
88 [SMCA_L3_CACHE] = { "l3_cache", "L3 Cache" },
89 [SMCA_CS] = { "coherent_slave", "Coherent Slave" },
90 [SMCA_PIE] = { "pie", "Power, Interrupts, etc." },
91 [SMCA_UMC] = { "umc", "Unified Memory Controller" },
92 [SMCA_PB] = { "param_block", "Parameter Block" },
93 [SMCA_PSP] = { "psp", "Platform Security Processor" },
94 [SMCA_SMU] = { "smu", "System Management Unit" },
97 static u32 smca_bank_addrs[MAX_NR_BANKS][NR_BLOCKS] __ro_after_init =
99 [0 ... MAX_NR_BANKS - 1] = { [0 ... NR_BLOCKS - 1] = -1 }
102 const char *smca_get_name(enum smca_bank_types t)
104 if (t >= N_SMCA_BANK_TYPES)
107 return smca_names[t].name;
110 const char *smca_get_long_name(enum smca_bank_types t)
112 if (t >= N_SMCA_BANK_TYPES)
115 return smca_names[t].long_name;
117 EXPORT_SYMBOL_GPL(smca_get_long_name);
119 static enum smca_bank_types smca_get_bank_type(unsigned int bank)
123 if (bank >= MAX_NR_BANKS)
124 return N_SMCA_BANK_TYPES;
126 b = &smca_banks[bank];
128 return N_SMCA_BANK_TYPES;
130 return b->hwid->bank_type;
133 static struct smca_hwid smca_hwid_mcatypes[] = {
134 /* { bank_type, hwid_mcatype, xec_bitmap } */
137 { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0), 0x0 },
139 /* ZN Core (HWID=0xB0) MCA types */
140 { SMCA_LS, HWID_MCATYPE(0xB0, 0x0), 0x1FFFEF },
141 { SMCA_IF, HWID_MCATYPE(0xB0, 0x1), 0x3FFF },
142 { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2), 0xF },
143 { SMCA_DE, HWID_MCATYPE(0xB0, 0x3), 0x1FF },
144 /* HWID 0xB0 MCATYPE 0x4 is Reserved */
145 { SMCA_EX, HWID_MCATYPE(0xB0, 0x5), 0x7FF },
146 { SMCA_FP, HWID_MCATYPE(0xB0, 0x6), 0x7F },
147 { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7), 0xFF },
149 /* Data Fabric MCA types */
150 { SMCA_CS, HWID_MCATYPE(0x2E, 0x0), 0x1FF },
151 { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1), 0xF },
153 /* Unified Memory Controller MCA type */
154 { SMCA_UMC, HWID_MCATYPE(0x96, 0x0), 0x3F },
156 /* Parameter Block MCA type */
157 { SMCA_PB, HWID_MCATYPE(0x05, 0x0), 0x1 },
159 /* Platform Security Processor MCA type */
160 { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0), 0x1 },
162 /* System Management Unit MCA type */
163 { SMCA_SMU, HWID_MCATYPE(0x01, 0x0), 0x1 },
166 struct smca_bank smca_banks[MAX_NR_BANKS];
167 EXPORT_SYMBOL_GPL(smca_banks);
170 * In SMCA enabled processors, we can have multiple banks for a given IP type.
171 * So to define a unique name for each bank, we use a temp c-string to append
172 * the MCA_IPID[InstanceId] to type's name in get_name().
174 * InstanceId is 32 bits which is 8 characters. Make sure MAX_MCATYPE_NAME_LEN
175 * is greater than 8 plus 1 (for underscore) plus length of longest type name.
177 #define MAX_MCATYPE_NAME_LEN 30
178 static char buf_mcatype[MAX_MCATYPE_NAME_LEN];
180 static DEFINE_PER_CPU(struct threshold_bank **, threshold_banks);
181 static DEFINE_PER_CPU(unsigned int, bank_map); /* see which banks are on */
183 static void amd_threshold_interrupt(void);
184 static void amd_deferred_error_interrupt(void);
186 static void default_deferred_error_interrupt(void)
188 pr_err("Unexpected deferred interrupt at vector %x\n", DEFERRED_ERROR_VECTOR);
190 void (*deferred_error_int_vector)(void) = default_deferred_error_interrupt;
192 static void smca_configure(unsigned int bank, unsigned int cpu)
194 unsigned int i, hwid_mcatype;
195 struct smca_hwid *s_hwid;
197 u32 smca_config = MSR_AMD64_SMCA_MCx_CONFIG(bank);
199 /* Set appropriate bits in MCA_CONFIG */
200 if (!rdmsr_safe(smca_config, &low, &high)) {
202 * OS is required to set the MCAX bit to acknowledge that it is
203 * now using the new MSR ranges and new registers under each
204 * bank. It also means that the OS will configure deferred
205 * errors in the new MCx_CONFIG register. If the bit is not set,
206 * uncorrectable errors will cause a system panic.
208 * MCA_CONFIG[MCAX] is bit 32 (0 in the high portion of the MSR.)
213 * SMCA sets the Deferred Error Interrupt type per bank.
215 * MCA_CONFIG[DeferredIntTypeSupported] is bit 5, and tells us
216 * if the DeferredIntType bit field is available.
218 * MCA_CONFIG[DeferredIntType] is bits [38:37] ([6:5] in the
219 * high portion of the MSR). OS should set this to 0x1 to enable
220 * APIC based interrupt. First, check that no interrupt has been
223 if ((low & BIT(5)) && !((high >> 5) & 0x3))
226 wrmsr(smca_config, low, high);
229 /* Return early if this bank was already initialized. */
230 if (smca_banks[bank].hwid)
233 if (rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) {
234 pr_warn("Failed to read MCA_IPID for bank %d\n", bank);
238 hwid_mcatype = HWID_MCATYPE(high & MCI_IPID_HWID,
239 (high & MCI_IPID_MCATYPE) >> 16);
241 for (i = 0; i < ARRAY_SIZE(smca_hwid_mcatypes); i++) {
242 s_hwid = &smca_hwid_mcatypes[i];
243 if (hwid_mcatype == s_hwid->hwid_mcatype) {
244 smca_banks[bank].hwid = s_hwid;
245 smca_banks[bank].id = low;
246 smca_banks[bank].sysfs_id = s_hwid->count++;
252 struct thresh_restart {
253 struct threshold_block *b;
260 static inline bool is_shared_bank(int bank)
263 * Scalable MCA provides for only one core to have access to the MSRs of
269 /* Bank 4 is for northbridge reporting and is thus shared */
273 static const char *bank4_names(const struct threshold_block *b)
275 switch (b->address) {
287 WARN(1, "Funny MSR: 0x%08x\n", b->address);
293 static bool lvt_interrupt_supported(unsigned int bank, u32 msr_high_bits)
296 * bank 4 supports APIC LVT interrupts implicitly since forever.
302 * IntP: interrupt present; if this bit is set, the thresholding
303 * bank can generate APIC LVT interrupts
305 return msr_high_bits & BIT(28);
308 static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi)
310 int msr = (hi & MASK_LVTOFF_HI) >> 20;
313 pr_err(FW_BUG "cpu %d, failed to setup threshold interrupt "
314 "for bank %d, block %d (MSR%08X=0x%x%08x)\n", b->cpu,
315 b->bank, b->block, b->address, hi, lo);
321 * On SMCA CPUs, LVT offset is programmed at a different MSR, and
322 * the BIOS provides the value. The original field where LVT offset
323 * was set is reserved. Return early here:
328 pr_err(FW_BUG "cpu %d, invalid threshold interrupt offset %d "
329 "for bank %d, block %d (MSR%08X=0x%x%08x)\n",
330 b->cpu, apic, b->bank, b->block, b->address, hi, lo);
337 /* Reprogram MCx_MISC MSR behind this threshold bank. */
338 static void threshold_restart_bank(void *_tr)
340 struct thresh_restart *tr = _tr;
343 rdmsr(tr->b->address, lo, hi);
345 if (tr->b->threshold_limit < (hi & THRESHOLD_MAX))
346 tr->reset = 1; /* limit cannot be lower than err count */
348 if (tr->reset) { /* reset err count and overflow bit */
350 (hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) |
351 (THRESHOLD_MAX - tr->b->threshold_limit);
352 } else if (tr->old_limit) { /* change limit w/o reset */
353 int new_count = (hi & THRESHOLD_MAX) +
354 (tr->old_limit - tr->b->threshold_limit);
356 hi = (hi & ~MASK_ERR_COUNT_HI) |
357 (new_count & THRESHOLD_MAX);
361 hi &= ~MASK_INT_TYPE_HI;
363 if (!tr->b->interrupt_capable)
366 if (tr->set_lvt_off) {
367 if (lvt_off_valid(tr->b, tr->lvt_off, lo, hi)) {
368 /* set new lvt offset */
369 hi &= ~MASK_LVTOFF_HI;
370 hi |= tr->lvt_off << 20;
374 if (tr->b->interrupt_enable)
379 hi |= MASK_COUNT_EN_HI;
380 wrmsr(tr->b->address, lo, hi);
383 static void mce_threshold_block_init(struct threshold_block *b, int offset)
385 struct thresh_restart tr = {
391 b->threshold_limit = THRESHOLD_MAX;
392 threshold_restart_bank(&tr);
395 static int setup_APIC_mce_threshold(int reserved, int new)
397 if (reserved < 0 && !setup_APIC_eilvt(new, THRESHOLD_APIC_VECTOR,
398 APIC_EILVT_MSG_FIX, 0))
404 static int setup_APIC_deferred_error(int reserved, int new)
406 if (reserved < 0 && !setup_APIC_eilvt(new, DEFERRED_ERROR_VECTOR,
407 APIC_EILVT_MSG_FIX, 0))
413 static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c)
415 u32 low = 0, high = 0;
416 int def_offset = -1, def_new;
418 if (rdmsr_safe(MSR_CU_DEF_ERR, &low, &high))
421 def_new = (low & MASK_DEF_LVTOFF) >> 4;
422 if (!(low & MASK_DEF_LVTOFF)) {
423 pr_err(FW_BUG "Your BIOS is not setting up LVT offset 0x2 for deferred error IRQs correctly.\n");
424 def_new = DEF_LVT_OFF;
425 low = (low & ~MASK_DEF_LVTOFF) | (DEF_LVT_OFF << 4);
428 def_offset = setup_APIC_deferred_error(def_offset, def_new);
429 if ((def_offset == def_new) &&
430 (deferred_error_int_vector != amd_deferred_error_interrupt))
431 deferred_error_int_vector = amd_deferred_error_interrupt;
434 low = (low & ~MASK_DEF_INT_TYPE) | DEF_INT_TYPE_APIC;
436 wrmsr(MSR_CU_DEF_ERR, low, high);
439 static u32 smca_get_block_address(unsigned int bank, unsigned int block)
444 if (smca_get_bank_type(bank) == SMCA_RESERVED)
448 return MSR_AMD64_SMCA_MCx_MISC(bank);
450 /* Check our cache first: */
451 if (smca_bank_addrs[bank][block] != -1)
452 return smca_bank_addrs[bank][block];
455 * For SMCA enabled processors, BLKPTR field of the first MISC register
456 * (MCx_MISC0) indicates presence of additional MISC regs set (MISC1-4).
458 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high))
461 if (!(low & MCI_CONFIG_MCAX))
464 if (!rdmsr_safe(MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high) &&
465 (low & MASK_BLKPTR_LO))
466 addr = MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1);
469 smca_bank_addrs[bank][block] = addr;
473 static u32 get_block_address(u32 current_addr, u32 low, u32 high,
474 unsigned int bank, unsigned int block)
476 u32 addr = 0, offset = 0;
478 if ((bank >= mca_cfg.banks) || (block >= NR_BLOCKS))
482 return smca_get_block_address(bank, block);
484 /* Fall back to method we used for older processors: */
487 addr = msr_ops.misc(bank);
490 offset = ((low & MASK_BLKPTR_LO) >> 21);
492 addr = MCG_XBLK_ADDR + offset;
495 addr = ++current_addr;
501 prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr,
502 int offset, u32 misc_high)
504 unsigned int cpu = smp_processor_id();
505 u32 smca_low, smca_high;
506 struct threshold_block b;
510 per_cpu(bank_map, cpu) |= (1 << bank);
512 memset(&b, 0, sizeof(b));
517 b.interrupt_capable = lvt_interrupt_supported(bank, misc_high);
519 if (!b.interrupt_capable)
522 b.interrupt_enable = 1;
524 if (!mce_flags.smca) {
525 new = (misc_high & MASK_LVTOFF_HI) >> 20;
529 /* Gather LVT offset for thresholding: */
530 if (rdmsr_safe(MSR_CU_DEF_ERR, &smca_low, &smca_high))
533 new = (smca_low & SMCA_THR_LVT_OFF) >> 12;
536 offset = setup_APIC_mce_threshold(offset, new);
538 if ((offset == new) && (mce_threshold_vector != amd_threshold_interrupt))
539 mce_threshold_vector = amd_threshold_interrupt;
542 mce_threshold_block_init(&b, offset);
548 /* cpu init entry point, called from mce.c with preempt off */
549 void mce_amd_feature_init(struct cpuinfo_x86 *c)
551 u32 low = 0, high = 0, address = 0;
552 unsigned int bank, block, cpu = smp_processor_id();
555 for (bank = 0; bank < mca_cfg.banks; ++bank) {
557 smca_configure(bank, cpu);
559 for (block = 0; block < NR_BLOCKS; ++block) {
560 address = get_block_address(address, low, high, bank, block);
564 if (rdmsr_safe(address, &low, &high))
567 if (!(high & MASK_VALID_HI))
570 if (!(high & MASK_CNTP_HI) ||
571 (high & MASK_LOCKED_HI))
574 offset = prepare_threshold_block(bank, block, address, offset, high);
578 if (mce_flags.succor)
579 deferred_error_interrupt_enable(c);
582 int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
584 u64 dram_base_addr, dram_limit_addr, dram_hole_base;
585 /* We start from the normalized address */
586 u64 ret_addr = norm_addr;
590 u8 die_id_shift, die_id_mask, socket_id_shift, socket_id_mask;
591 u8 intlv_num_dies, intlv_num_chan, intlv_num_sockets;
592 u8 intlv_addr_sel, intlv_addr_bit;
593 u8 num_intlv_bits, hashed_bit;
594 u8 lgcy_mmio_hole_en, base = 0;
595 u8 cs_mask, cs_id = 0;
596 bool hash_enabled = false;
598 /* Read D18F0x1B4 (DramOffset), check if base 1 is used. */
599 if (amd_df_indirect_read(nid, 0, 0x1B4, umc, &tmp))
602 /* Remove HiAddrOffset from normalized address, if enabled: */
604 u64 hi_addr_offset = (tmp & GENMASK_ULL(31, 20)) << 8;
606 if (norm_addr >= hi_addr_offset) {
607 ret_addr -= hi_addr_offset;
612 /* Read D18F0x110 (DramBaseAddress). */
613 if (amd_df_indirect_read(nid, 0, 0x110 + (8 * base), umc, &tmp))
616 /* Check if address range is valid. */
617 if (!(tmp & BIT(0))) {
618 pr_err("%s: Invalid DramBaseAddress range: 0x%x.\n",
623 lgcy_mmio_hole_en = tmp & BIT(1);
624 intlv_num_chan = (tmp >> 4) & 0xF;
625 intlv_addr_sel = (tmp >> 8) & 0x7;
626 dram_base_addr = (tmp & GENMASK_ULL(31, 12)) << 16;
628 /* {0, 1, 2, 3} map to address bits {8, 9, 10, 11} respectively */
629 if (intlv_addr_sel > 3) {
630 pr_err("%s: Invalid interleave address select %d.\n",
631 __func__, intlv_addr_sel);
635 /* Read D18F0x114 (DramLimitAddress). */
636 if (amd_df_indirect_read(nid, 0, 0x114 + (8 * base), umc, &tmp))
639 intlv_num_sockets = (tmp >> 8) & 0x1;
640 intlv_num_dies = (tmp >> 10) & 0x3;
641 dram_limit_addr = ((tmp & GENMASK_ULL(31, 12)) << 16) | GENMASK_ULL(27, 0);
643 intlv_addr_bit = intlv_addr_sel + 8;
645 /* Re-use intlv_num_chan by setting it equal to log2(#channels) */
646 switch (intlv_num_chan) {
647 case 0: intlv_num_chan = 0; break;
648 case 1: intlv_num_chan = 1; break;
649 case 3: intlv_num_chan = 2; break;
650 case 5: intlv_num_chan = 3; break;
651 case 7: intlv_num_chan = 4; break;
653 case 8: intlv_num_chan = 1;
657 pr_err("%s: Invalid number of interleaved channels %d.\n",
658 __func__, intlv_num_chan);
662 num_intlv_bits = intlv_num_chan;
664 if (intlv_num_dies > 2) {
665 pr_err("%s: Invalid number of interleaved nodes/dies %d.\n",
666 __func__, intlv_num_dies);
670 num_intlv_bits += intlv_num_dies;
672 /* Add a bit if sockets are interleaved. */
673 num_intlv_bits += intlv_num_sockets;
675 /* Assert num_intlv_bits <= 4 */
676 if (num_intlv_bits > 4) {
677 pr_err("%s: Invalid interleave bits %d.\n",
678 __func__, num_intlv_bits);
682 if (num_intlv_bits > 0) {
683 u64 temp_addr_x, temp_addr_i, temp_addr_y;
684 u8 die_id_bit, sock_id_bit, cs_fabric_id;
687 * Read FabricBlockInstanceInformation3_CS[BlockFabricID].
688 * This is the fabric id for this coherent slave. Use
689 * umc/channel# as instance id of the coherent slave
692 if (amd_df_indirect_read(nid, 0, 0x50, umc, &tmp))
695 cs_fabric_id = (tmp >> 8) & 0xFF;
698 /* If interleaved over more than 1 channel: */
699 if (intlv_num_chan) {
700 die_id_bit = intlv_num_chan;
701 cs_mask = (1 << die_id_bit) - 1;
702 cs_id = cs_fabric_id & cs_mask;
705 sock_id_bit = die_id_bit;
707 /* Read D18F1x208 (SystemFabricIdMask). */
708 if (intlv_num_dies || intlv_num_sockets)
709 if (amd_df_indirect_read(nid, 1, 0x208, umc, &tmp))
712 /* If interleaved over more than 1 die. */
713 if (intlv_num_dies) {
714 sock_id_bit = die_id_bit + intlv_num_dies;
715 die_id_shift = (tmp >> 24) & 0xF;
716 die_id_mask = (tmp >> 8) & 0xFF;
718 cs_id |= ((cs_fabric_id & die_id_mask) >> die_id_shift) << die_id_bit;
721 /* If interleaved over more than 1 socket. */
722 if (intlv_num_sockets) {
723 socket_id_shift = (tmp >> 28) & 0xF;
724 socket_id_mask = (tmp >> 16) & 0xFF;
726 cs_id |= ((cs_fabric_id & socket_id_mask) >> socket_id_shift) << sock_id_bit;
730 * The pre-interleaved address consists of XXXXXXIIIYYYYY
731 * where III is the ID for this CS, and XXXXXXYYYYY are the
732 * address bits from the post-interleaved address.
733 * "num_intlv_bits" has been calculated to tell us how many "I"
734 * bits there are. "intlv_addr_bit" tells us how many "Y" bits
735 * there are (where "I" starts).
737 temp_addr_y = ret_addr & GENMASK_ULL(intlv_addr_bit-1, 0);
738 temp_addr_i = (cs_id << intlv_addr_bit);
739 temp_addr_x = (ret_addr & GENMASK_ULL(63, intlv_addr_bit)) << num_intlv_bits;
740 ret_addr = temp_addr_x | temp_addr_i | temp_addr_y;
743 /* Add dram base address */
744 ret_addr += dram_base_addr;
746 /* If legacy MMIO hole enabled */
747 if (lgcy_mmio_hole_en) {
748 if (amd_df_indirect_read(nid, 0, 0x104, umc, &tmp))
751 dram_hole_base = tmp & GENMASK(31, 24);
752 if (ret_addr >= dram_hole_base)
753 ret_addr += (BIT_ULL(32) - dram_hole_base);
757 /* Save some parentheses and grab ls-bit at the end. */
758 hashed_bit = (ret_addr >> 12) ^
764 hashed_bit &= BIT(0);
766 if (hashed_bit != ((ret_addr >> intlv_addr_bit) & BIT(0)))
767 ret_addr ^= BIT(intlv_addr_bit);
770 /* Is calculated system address is above DRAM limit address? */
771 if (ret_addr > dram_limit_addr)
774 *sys_addr = ret_addr;
780 EXPORT_SYMBOL_GPL(umc_normaddr_to_sysaddr);
782 bool amd_mce_is_memory_error(struct mce *m)
784 /* ErrCodeExt[20:16] */
785 u8 xec = (m->status >> 16) & 0x1f;
788 return smca_get_bank_type(m->bank) == SMCA_UMC && xec == 0x0;
790 return m->bank == 4 && xec == 0x8;
793 static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc)
804 if (m.status & MCI_STATUS_ADDRV) {
808 * Extract [55:<lsb>] where lsb is the least significant
809 * *valid* bit of the address bits.
811 if (mce_flags.smca) {
812 u8 lsb = (m.addr >> 56) & 0x3f;
814 m.addr &= GENMASK_ULL(55, lsb);
818 if (mce_flags.smca) {
819 rdmsrl(MSR_AMD64_SMCA_MCx_IPID(bank), m.ipid);
821 if (m.status & MCI_STATUS_SYNDV)
822 rdmsrl(MSR_AMD64_SMCA_MCx_SYND(bank), m.synd);
828 asmlinkage __visible void __irq_entry smp_deferred_error_interrupt(void)
831 trace_deferred_error_apic_entry(DEFERRED_ERROR_VECTOR);
832 inc_irq_stat(irq_deferred_error_count);
833 deferred_error_int_vector();
834 trace_deferred_error_apic_exit(DEFERRED_ERROR_VECTOR);
839 * Returns true if the logged error is deferred. False, otherwise.
842 _log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc)
844 u64 status, addr = 0;
846 rdmsrl(msr_stat, status);
847 if (!(status & MCI_STATUS_VAL))
850 if (status & MCI_STATUS_ADDRV)
851 rdmsrl(msr_addr, addr);
853 __log_error(bank, status, addr, misc);
857 return status & MCI_STATUS_DEFERRED;
861 * We have three scenarios for checking for Deferred errors:
863 * 1) Non-SMCA systems check MCA_STATUS and log error if found.
864 * 2) SMCA systems check MCA_STATUS. If error is found then log it and also
866 * 3) SMCA systems check MCA_DESTAT, if error was not found in MCA_STATUS, and
869 static void log_error_deferred(unsigned int bank)
873 defrd = _log_error_bank(bank, msr_ops.status(bank),
874 msr_ops.addr(bank), 0);
879 /* Clear MCA_DESTAT if we logged the deferred error from MCA_STATUS. */
881 wrmsrl(MSR_AMD64_SMCA_MCx_DESTAT(bank), 0);
886 * Only deferred errors are logged in MCA_DE{STAT,ADDR} so just check
889 _log_error_bank(bank, MSR_AMD64_SMCA_MCx_DESTAT(bank),
890 MSR_AMD64_SMCA_MCx_DEADDR(bank), 0);
893 /* APIC interrupt handler for deferred errors */
894 static void amd_deferred_error_interrupt(void)
898 for (bank = 0; bank < mca_cfg.banks; ++bank)
899 log_error_deferred(bank);
902 static void log_error_thresholding(unsigned int bank, u64 misc)
904 _log_error_bank(bank, msr_ops.status(bank), msr_ops.addr(bank), misc);
907 static void log_and_reset_block(struct threshold_block *block)
909 struct thresh_restart tr;
910 u32 low = 0, high = 0;
915 if (rdmsr_safe(block->address, &low, &high))
918 if (!(high & MASK_OVERFLOW_HI))
921 /* Log the MCE which caused the threshold event. */
922 log_error_thresholding(block->bank, ((u64)high << 32) | low);
924 /* Reset threshold block after logging error. */
925 memset(&tr, 0, sizeof(tr));
927 threshold_restart_bank(&tr);
931 * Threshold interrupt handler will service THRESHOLD_APIC_VECTOR. The interrupt
932 * goes off when error_count reaches threshold_limit.
934 static void amd_threshold_interrupt(void)
936 struct threshold_block *first_block = NULL, *block = NULL, *tmp = NULL;
937 unsigned int bank, cpu = smp_processor_id();
939 for (bank = 0; bank < mca_cfg.banks; ++bank) {
940 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
943 first_block = per_cpu(threshold_banks, cpu)[bank]->blocks;
948 * The first block is also the head of the list. Check it first
949 * before iterating over the rest.
951 log_and_reset_block(first_block);
952 list_for_each_entry_safe(block, tmp, &first_block->miscj, miscj)
953 log_and_reset_block(block);
961 struct threshold_attr {
962 struct attribute attr;
963 ssize_t (*show) (struct threshold_block *, char *);
964 ssize_t (*store) (struct threshold_block *, const char *, size_t count);
967 #define SHOW_FIELDS(name) \
968 static ssize_t show_ ## name(struct threshold_block *b, char *buf) \
970 return sprintf(buf, "%lu\n", (unsigned long) b->name); \
972 SHOW_FIELDS(interrupt_enable)
973 SHOW_FIELDS(threshold_limit)
976 store_interrupt_enable(struct threshold_block *b, const char *buf, size_t size)
978 struct thresh_restart tr;
981 if (!b->interrupt_capable)
984 if (kstrtoul(buf, 0, &new) < 0)
987 b->interrupt_enable = !!new;
989 memset(&tr, 0, sizeof(tr));
992 smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
998 store_threshold_limit(struct threshold_block *b, const char *buf, size_t size)
1000 struct thresh_restart tr;
1003 if (kstrtoul(buf, 0, &new) < 0)
1006 if (new > THRESHOLD_MAX)
1007 new = THRESHOLD_MAX;
1011 memset(&tr, 0, sizeof(tr));
1012 tr.old_limit = b->threshold_limit;
1013 b->threshold_limit = new;
1016 smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
1021 static ssize_t show_error_count(struct threshold_block *b, char *buf)
1025 rdmsr_on_cpu(b->cpu, b->address, &lo, &hi);
1027 return sprintf(buf, "%u\n", ((hi & THRESHOLD_MAX) -
1028 (THRESHOLD_MAX - b->threshold_limit)));
1031 static struct threshold_attr error_count = {
1032 .attr = {.name = __stringify(error_count), .mode = 0444 },
1033 .show = show_error_count,
1036 #define RW_ATTR(val) \
1037 static struct threshold_attr val = { \
1038 .attr = {.name = __stringify(val), .mode = 0644 }, \
1039 .show = show_## val, \
1040 .store = store_## val, \
1043 RW_ATTR(interrupt_enable);
1044 RW_ATTR(threshold_limit);
1046 static struct attribute *default_attrs[] = {
1047 &threshold_limit.attr,
1049 NULL, /* possibly interrupt_enable if supported, see below */
1053 #define to_block(k) container_of(k, struct threshold_block, kobj)
1054 #define to_attr(a) container_of(a, struct threshold_attr, attr)
1056 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
1058 struct threshold_block *b = to_block(kobj);
1059 struct threshold_attr *a = to_attr(attr);
1062 ret = a->show ? a->show(b, buf) : -EIO;
1067 static ssize_t store(struct kobject *kobj, struct attribute *attr,
1068 const char *buf, size_t count)
1070 struct threshold_block *b = to_block(kobj);
1071 struct threshold_attr *a = to_attr(attr);
1074 ret = a->store ? a->store(b, buf, count) : -EIO;
1079 static const struct sysfs_ops threshold_ops = {
1084 static struct kobj_type threshold_ktype = {
1085 .sysfs_ops = &threshold_ops,
1086 .default_attrs = default_attrs,
1089 static const char *get_name(unsigned int bank, struct threshold_block *b)
1091 enum smca_bank_types bank_type;
1093 if (!mce_flags.smca) {
1095 return bank4_names(b);
1097 return th_names[bank];
1100 bank_type = smca_get_bank_type(bank);
1101 if (bank_type >= N_SMCA_BANK_TYPES)
1104 if (b && bank_type == SMCA_UMC) {
1105 if (b->block < ARRAY_SIZE(smca_umc_block_names))
1106 return smca_umc_block_names[b->block];
1110 if (smca_banks[bank].hwid->count == 1)
1111 return smca_get_name(bank_type);
1113 snprintf(buf_mcatype, MAX_MCATYPE_NAME_LEN,
1114 "%s_%x", smca_get_name(bank_type),
1115 smca_banks[bank].sysfs_id);
1119 static int allocate_threshold_blocks(unsigned int cpu, unsigned int bank,
1120 unsigned int block, u32 address)
1122 struct threshold_block *b = NULL;
1126 if ((bank >= mca_cfg.banks) || (block >= NR_BLOCKS))
1129 if (rdmsr_safe_on_cpu(cpu, address, &low, &high))
1132 if (!(high & MASK_VALID_HI)) {
1139 if (!(high & MASK_CNTP_HI) ||
1140 (high & MASK_LOCKED_HI))
1143 b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL);
1150 b->address = address;
1151 b->interrupt_enable = 0;
1152 b->interrupt_capable = lvt_interrupt_supported(bank, high);
1153 b->threshold_limit = THRESHOLD_MAX;
1155 if (b->interrupt_capable) {
1156 threshold_ktype.default_attrs[2] = &interrupt_enable.attr;
1157 b->interrupt_enable = 1;
1159 threshold_ktype.default_attrs[2] = NULL;
1162 INIT_LIST_HEAD(&b->miscj);
1164 if (per_cpu(threshold_banks, cpu)[bank]->blocks) {
1166 &per_cpu(threshold_banks, cpu)[bank]->blocks->miscj);
1168 per_cpu(threshold_banks, cpu)[bank]->blocks = b;
1171 err = kobject_init_and_add(&b->kobj, &threshold_ktype,
1172 per_cpu(threshold_banks, cpu)[bank]->kobj,
1177 address = get_block_address(address, low, high, bank, ++block);
1181 err = allocate_threshold_blocks(cpu, bank, block, address);
1186 kobject_uevent(&b->kobj, KOBJ_ADD);
1192 kobject_put(&b->kobj);
1193 list_del(&b->miscj);
1199 static int __threshold_add_blocks(struct threshold_bank *b)
1201 struct list_head *head = &b->blocks->miscj;
1202 struct threshold_block *pos = NULL;
1203 struct threshold_block *tmp = NULL;
1206 err = kobject_add(&b->blocks->kobj, b->kobj, b->blocks->kobj.name);
1210 list_for_each_entry_safe(pos, tmp, head, miscj) {
1212 err = kobject_add(&pos->kobj, b->kobj, pos->kobj.name);
1214 list_for_each_entry_safe_reverse(pos, tmp, head, miscj)
1215 kobject_del(&pos->kobj);
1223 static int threshold_create_bank(unsigned int cpu, unsigned int bank)
1225 struct device *dev = per_cpu(mce_device, cpu);
1226 struct amd_northbridge *nb = NULL;
1227 struct threshold_bank *b = NULL;
1228 const char *name = get_name(bank, NULL);
1234 if (is_shared_bank(bank)) {
1235 nb = node_to_amd_nb(amd_get_nb_id(cpu));
1237 /* threshold descriptor already initialized on this node? */
1238 if (nb && nb->bank4) {
1241 err = kobject_add(b->kobj, &dev->kobj, name);
1245 per_cpu(threshold_banks, cpu)[bank] = b;
1246 refcount_inc(&b->cpus);
1248 err = __threshold_add_blocks(b);
1254 b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL);
1260 b->kobj = kobject_create_and_add(name, &dev->kobj);
1266 per_cpu(threshold_banks, cpu)[bank] = b;
1268 if (is_shared_bank(bank)) {
1269 refcount_set(&b->cpus, 1);
1271 /* nb is already initialized, see above */
1278 err = allocate_threshold_blocks(cpu, bank, 0, msr_ops.misc(bank));
1289 static void deallocate_threshold_block(unsigned int cpu,
1292 struct threshold_block *pos = NULL;
1293 struct threshold_block *tmp = NULL;
1294 struct threshold_bank *head = per_cpu(threshold_banks, cpu)[bank];
1299 list_for_each_entry_safe(pos, tmp, &head->blocks->miscj, miscj) {
1300 kobject_put(&pos->kobj);
1301 list_del(&pos->miscj);
1305 kfree(per_cpu(threshold_banks, cpu)[bank]->blocks);
1306 per_cpu(threshold_banks, cpu)[bank]->blocks = NULL;
1309 static void __threshold_remove_blocks(struct threshold_bank *b)
1311 struct threshold_block *pos = NULL;
1312 struct threshold_block *tmp = NULL;
1314 kobject_del(b->kobj);
1316 list_for_each_entry_safe(pos, tmp, &b->blocks->miscj, miscj)
1317 kobject_del(&pos->kobj);
1320 static void threshold_remove_bank(unsigned int cpu, int bank)
1322 struct amd_northbridge *nb;
1323 struct threshold_bank *b;
1325 b = per_cpu(threshold_banks, cpu)[bank];
1332 if (is_shared_bank(bank)) {
1333 if (!refcount_dec_and_test(&b->cpus)) {
1334 __threshold_remove_blocks(b);
1335 per_cpu(threshold_banks, cpu)[bank] = NULL;
1339 * the last CPU on this node using the shared bank is
1340 * going away, remove that bank now.
1342 nb = node_to_amd_nb(amd_get_nb_id(cpu));
1347 deallocate_threshold_block(cpu, bank);
1350 kobject_del(b->kobj);
1351 kobject_put(b->kobj);
1353 per_cpu(threshold_banks, cpu)[bank] = NULL;
1356 int mce_threshold_remove_device(unsigned int cpu)
1360 if (!thresholding_en)
1363 for (bank = 0; bank < mca_cfg.banks; ++bank) {
1364 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
1366 threshold_remove_bank(cpu, bank);
1368 kfree(per_cpu(threshold_banks, cpu));
1369 per_cpu(threshold_banks, cpu) = NULL;
1373 /* create dir/files for all valid threshold banks */
1374 int mce_threshold_create_device(unsigned int cpu)
1377 struct threshold_bank **bp;
1380 if (!thresholding_en)
1383 bp = per_cpu(threshold_banks, cpu);
1387 bp = kzalloc(sizeof(struct threshold_bank *) * mca_cfg.banks,
1392 per_cpu(threshold_banks, cpu) = bp;
1394 for (bank = 0; bank < mca_cfg.banks; ++bank) {
1395 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
1397 err = threshold_create_bank(cpu, bank);
1403 mce_threshold_remove_device(cpu);
1407 static __init int threshold_init_device(void)
1411 if (mce_threshold_vector == amd_threshold_interrupt)
1412 thresholding_en = true;
1414 /* to hit CPUs online before the notifier is up */
1415 for_each_online_cpu(lcpu) {
1416 int err = mce_threshold_create_device(lcpu);
1425 * there are 3 funcs which need to be _initcalled in a logic sequence:
1426 * 1. xen_late_init_mcelog
1427 * 2. mcheck_init_device
1428 * 3. threshold_init_device
1430 * xen_late_init_mcelog must register xen_mce_chrdev_device before
1431 * native mce_chrdev_device registration if running under xen platform;
1433 * mcheck_init_device should be inited before threshold_init_device to
1434 * initialize mce_device, otherwise a NULL ptr dereference will cause panic.
1436 * so we use following _initcalls
1437 * 1. device_initcall(xen_late_init_mcelog);
1438 * 2. device_initcall_sync(mcheck_init_device);
1439 * 3. late_initcall(threshold_init_device);
1441 * when running under xen, the initcall order is 1,2,3;
1442 * on baremetal, we skip 1 and we do only 2 and 3.
1444 late_initcall(threshold_init_device);