diff options
Diffstat (limited to 'arch/x86/kernel/cpu/mce/amd.c')
| -rw-r--r-- | arch/x86/kernel/cpu/mce/amd.c | 1374 |
1 files changed, 1374 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c new file mode 100644 index 000000000..c267f43de --- /dev/null +++ b/arch/x86/kernel/cpu/mce/amd.c @@ -0,0 +1,1374 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * (c) 2005-2016 Advanced Micro Devices, Inc. + * + * Written by Jacob Shin - AMD, Inc. + * Maintained by: Borislav Petkov <bp@alien8.de> + * + * All MC4_MISCi registers are shared between cores on a node. + */ +#include <linux/interrupt.h> +#include <linux/notifier.h> +#include <linux/kobject.h> +#include <linux/percpu.h> +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/sysfs.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/cpu.h> +#include <linux/smp.h> +#include <linux/string.h> + +#include <asm/amd_nb.h> +#include <asm/traps.h> +#include <asm/apic.h> +#include <asm/mce.h> +#include <asm/msr.h> +#include <asm/trace/irq_vectors.h> + +#include "internal.h" + +#define NR_BLOCKS 5 +#define THRESHOLD_MAX 0xFFF +#define INT_TYPE_APIC 0x00020000 +#define MASK_VALID_HI 0x80000000 +#define MASK_CNTP_HI 0x40000000 +#define MASK_LOCKED_HI 0x20000000 +#define MASK_LVTOFF_HI 0x00F00000 +#define MASK_COUNT_EN_HI 0x00080000 +#define MASK_INT_TYPE_HI 0x00060000 +#define MASK_OVERFLOW_HI 0x00010000 +#define MASK_ERR_COUNT_HI 0x00000FFF +#define MASK_BLKPTR_LO 0xFF000000 +#define MCG_XBLK_ADDR 0xC0000400 + +/* Deferred error settings */ +#define MSR_CU_DEF_ERR 0xC0000410 +#define MASK_DEF_LVTOFF 0x000000F0 +#define MASK_DEF_INT_TYPE 0x00000006 +#define DEF_LVT_OFF 0x2 +#define DEF_INT_TYPE_APIC 0x2 + +/* Scalable MCA: */ + +/* Threshold LVT offset is at MSR0xC0000410[15:12] */ +#define SMCA_THR_LVT_OFF 0xF000 + +static bool thresholding_irq_en; + +static const char * const th_names[] = { + "load_store", + "insn_fetch", + "combined_unit", + "decode_unit", + "northbridge", + "execution_unit", +}; + +static const char * const smca_umc_block_names[] = { + "dram_ecc", + "misc_umc" +}; + +#define HWID_MCATYPE(hwid, mcatype) (((hwid) << 16) | (mcatype)) + +struct smca_hwid { + unsigned int bank_type; /* Use with smca_bank_types for easy indexing. */ + u32 hwid_mcatype; /* (hwid,mcatype) tuple */ +}; + +struct smca_bank { + const struct smca_hwid *hwid; + u32 id; /* Value of MCA_IPID[InstanceId]. */ + u8 sysfs_id; /* Value used for sysfs name. */ +}; + +static DEFINE_PER_CPU_READ_MOSTLY(struct smca_bank[MAX_NR_BANKS], smca_banks); +static DEFINE_PER_CPU_READ_MOSTLY(u8[N_SMCA_BANK_TYPES], smca_bank_counts); + +struct smca_bank_name { + const char *name; /* Short name for sysfs */ + const char *long_name; /* Long name for pretty-printing */ +}; + +static struct smca_bank_name smca_names[] = { + [SMCA_LS ... SMCA_LS_V2] = { "load_store", "Load Store Unit" }, + [SMCA_IF] = { "insn_fetch", "Instruction Fetch Unit" }, + [SMCA_L2_CACHE] = { "l2_cache", "L2 Cache" }, + [SMCA_DE] = { "decode_unit", "Decode Unit" }, + [SMCA_RESERVED] = { "reserved", "Reserved" }, + [SMCA_EX] = { "execution_unit", "Execution Unit" }, + [SMCA_FP] = { "floating_point", "Floating Point Unit" }, + [SMCA_L3_CACHE] = { "l3_cache", "L3 Cache" }, + [SMCA_CS ... SMCA_CS_V2] = { "coherent_slave", "Coherent Slave" }, + [SMCA_PIE] = { "pie", "Power, Interrupts, etc." }, + + /* UMC v2 is separate because both of them can exist in a single system. */ + [SMCA_UMC] = { "umc", "Unified Memory Controller" }, + [SMCA_UMC_V2] = { "umc_v2", "Unified Memory Controller v2" }, + [SMCA_PB] = { "param_block", "Parameter Block" }, + [SMCA_PSP ... SMCA_PSP_V2] = { "psp", "Platform Security Processor" }, + [SMCA_SMU ... SMCA_SMU_V2] = { "smu", "System Management Unit" }, + [SMCA_MP5] = { "mp5", "Microprocessor 5 Unit" }, + [SMCA_MPDMA] = { "mpdma", "MPDMA Unit" }, + [SMCA_NBIO] = { "nbio", "Northbridge IO Unit" }, + [SMCA_PCIE ... SMCA_PCIE_V2] = { "pcie", "PCI Express Unit" }, + [SMCA_XGMI_PCS] = { "xgmi_pcs", "Ext Global Memory Interconnect PCS Unit" }, + [SMCA_NBIF] = { "nbif", "NBIF Unit" }, + [SMCA_SHUB] = { "shub", "System Hub Unit" }, + [SMCA_SATA] = { "sata", "SATA Unit" }, + [SMCA_USB] = { "usb", "USB Unit" }, + [SMCA_GMI_PCS] = { "gmi_pcs", "Global Memory Interconnect PCS Unit" }, + [SMCA_XGMI_PHY] = { "xgmi_phy", "Ext Global Memory Interconnect PHY Unit" }, + [SMCA_WAFL_PHY] = { "wafl_phy", "WAFL PHY Unit" }, + [SMCA_GMI_PHY] = { "gmi_phy", "Global Memory Interconnect PHY Unit" }, +}; + +static const char *smca_get_name(enum smca_bank_types t) +{ + if (t >= N_SMCA_BANK_TYPES) + return NULL; + + return smca_names[t].name; +} + +const char *smca_get_long_name(enum smca_bank_types t) +{ + if (t >= N_SMCA_BANK_TYPES) + return NULL; + + return smca_names[t].long_name; +} +EXPORT_SYMBOL_GPL(smca_get_long_name); + +enum smca_bank_types smca_get_bank_type(unsigned int cpu, unsigned int bank) +{ + struct smca_bank *b; + + if (bank >= MAX_NR_BANKS) + return N_SMCA_BANK_TYPES; + + b = &per_cpu(smca_banks, cpu)[bank]; + if (!b->hwid) + return N_SMCA_BANK_TYPES; + + return b->hwid->bank_type; +} +EXPORT_SYMBOL_GPL(smca_get_bank_type); + +static const struct smca_hwid smca_hwid_mcatypes[] = { + /* { bank_type, hwid_mcatype } */ + + /* Reserved type */ + { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0) }, + + /* ZN Core (HWID=0xB0) MCA types */ + { SMCA_LS, HWID_MCATYPE(0xB0, 0x0) }, + { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10) }, + { SMCA_IF, HWID_MCATYPE(0xB0, 0x1) }, + { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2) }, + { SMCA_DE, HWID_MCATYPE(0xB0, 0x3) }, + /* HWID 0xB0 MCATYPE 0x4 is Reserved */ + { SMCA_EX, HWID_MCATYPE(0xB0, 0x5) }, + { SMCA_FP, HWID_MCATYPE(0xB0, 0x6) }, + { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7) }, + + /* Data Fabric MCA types */ + { SMCA_CS, HWID_MCATYPE(0x2E, 0x0) }, + { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1) }, + { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2) }, + + /* Unified Memory Controller MCA type */ + { SMCA_UMC, HWID_MCATYPE(0x96, 0x0) }, + { SMCA_UMC_V2, HWID_MCATYPE(0x96, 0x1) }, + + /* Parameter Block MCA type */ + { SMCA_PB, HWID_MCATYPE(0x05, 0x0) }, + + /* Platform Security Processor MCA type */ + { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0) }, + { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1) }, + + /* System Management Unit MCA type */ + { SMCA_SMU, HWID_MCATYPE(0x01, 0x0) }, + { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1) }, + + /* Microprocessor 5 Unit MCA type */ + { SMCA_MP5, HWID_MCATYPE(0x01, 0x2) }, + + /* MPDMA MCA type */ + { SMCA_MPDMA, HWID_MCATYPE(0x01, 0x3) }, + + /* Northbridge IO Unit MCA type */ + { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0) }, + + /* PCI Express Unit MCA type */ + { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0) }, + { SMCA_PCIE_V2, HWID_MCATYPE(0x46, 0x1) }, + + { SMCA_XGMI_PCS, HWID_MCATYPE(0x50, 0x0) }, + { SMCA_NBIF, HWID_MCATYPE(0x6C, 0x0) }, + { SMCA_SHUB, HWID_MCATYPE(0x80, 0x0) }, + { SMCA_SATA, HWID_MCATYPE(0xA8, 0x0) }, + { SMCA_USB, HWID_MCATYPE(0xAA, 0x0) }, + { SMCA_GMI_PCS, HWID_MCATYPE(0x241, 0x0) }, + { SMCA_XGMI_PHY, HWID_MCATYPE(0x259, 0x0) }, + { SMCA_WAFL_PHY, HWID_MCATYPE(0x267, 0x0) }, + { SMCA_GMI_PHY, HWID_MCATYPE(0x269, 0x0) }, +}; + +/* + * In SMCA enabled processors, we can have multiple banks for a given IP type. + * So to define a unique name for each bank, we use a temp c-string to append + * the MCA_IPID[InstanceId] to type's name in get_name(). + * + * InstanceId is 32 bits which is 8 characters. Make sure MAX_MCATYPE_NAME_LEN + * is greater than 8 plus 1 (for underscore) plus length of longest type name. + */ +#define MAX_MCATYPE_NAME_LEN 30 +static char buf_mcatype[MAX_MCATYPE_NAME_LEN]; + +static DEFINE_PER_CPU(struct threshold_bank **, threshold_banks); + +/* + * A list of the banks enabled on each logical CPU. Controls which respective + * descriptors to initialize later in mce_threshold_create_device(). + */ +static DEFINE_PER_CPU(u64, bank_map); + +/* Map of banks that have more than MCA_MISC0 available. */ +static DEFINE_PER_CPU(u64, smca_misc_banks_map); + +static void amd_threshold_interrupt(void); +static void amd_deferred_error_interrupt(void); + +static void default_deferred_error_interrupt(void) +{ + pr_err("Unexpected deferred interrupt at vector %x\n", DEFERRED_ERROR_VECTOR); +} +void (*deferred_error_int_vector)(void) = default_deferred_error_interrupt; + +static void smca_set_misc_banks_map(unsigned int bank, unsigned int cpu) +{ + u32 low, high; + + /* + * For SMCA enabled processors, BLKPTR field of the first MISC register + * (MCx_MISC0) indicates presence of additional MISC regs set (MISC1-4). + */ + if (rdmsr_safe(MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high)) + return; + + if (!(low & MCI_CONFIG_MCAX)) + return; + + if (rdmsr_safe(MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high)) + return; + + if (low & MASK_BLKPTR_LO) + per_cpu(smca_misc_banks_map, cpu) |= BIT_ULL(bank); + +} + +static void smca_configure(unsigned int bank, unsigned int cpu) +{ + u8 *bank_counts = this_cpu_ptr(smca_bank_counts); + const struct smca_hwid *s_hwid; + unsigned int i, hwid_mcatype; + u32 high, low; + u32 smca_config = MSR_AMD64_SMCA_MCx_CONFIG(bank); + + /* Set appropriate bits in MCA_CONFIG */ + if (!rdmsr_safe(smca_config, &low, &high)) { + /* + * OS is required to set the MCAX bit to acknowledge that it is + * now using the new MSR ranges and new registers under each + * bank. It also means that the OS will configure deferred + * errors in the new MCx_CONFIG register. If the bit is not set, + * uncorrectable errors will cause a system panic. + * + * MCA_CONFIG[MCAX] is bit 32 (0 in the high portion of the MSR.) + */ + high |= BIT(0); + + /* + * SMCA sets the Deferred Error Interrupt type per bank. + * + * MCA_CONFIG[DeferredIntTypeSupported] is bit 5, and tells us + * if the DeferredIntType bit field is available. + * + * MCA_CONFIG[DeferredIntType] is bits [38:37] ([6:5] in the + * high portion of the MSR). OS should set this to 0x1 to enable + * APIC based interrupt. First, check that no interrupt has been + * set. + */ + if ((low & BIT(5)) && !((high >> 5) & 0x3)) + high |= BIT(5); + + this_cpu_ptr(mce_banks_array)[bank].lsb_in_status = !!(low & BIT(8)); + + wrmsr(smca_config, low, high); + } + + smca_set_misc_banks_map(bank, cpu); + + if (rdmsr_safe(MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) { + pr_warn("Failed to read MCA_IPID for bank %d\n", bank); + return; + } + + hwid_mcatype = HWID_MCATYPE(high & MCI_IPID_HWID, + (high & MCI_IPID_MCATYPE) >> 16); + + for (i = 0; i < ARRAY_SIZE(smca_hwid_mcatypes); i++) { + s_hwid = &smca_hwid_mcatypes[i]; + + if (hwid_mcatype == s_hwid->hwid_mcatype) { + this_cpu_ptr(smca_banks)[bank].hwid = s_hwid; + this_cpu_ptr(smca_banks)[bank].id = low; + this_cpu_ptr(smca_banks)[bank].sysfs_id = bank_counts[s_hwid->bank_type]++; + break; + } + } +} + +struct thresh_restart { + struct threshold_block *b; + int reset; + int set_lvt_off; + int lvt_off; + u16 old_limit; +}; + +static inline bool is_shared_bank(int bank) +{ + /* + * Scalable MCA provides for only one core to have access to the MSRs of + * a shared bank. + */ + if (mce_flags.smca) + return false; + + /* Bank 4 is for northbridge reporting and is thus shared */ + return (bank == 4); +} + +static const char *bank4_names(const struct threshold_block *b) +{ + switch (b->address) { + /* MSR4_MISC0 */ + case 0x00000413: + return "dram"; + + case 0xc0000408: + return "ht_links"; + + case 0xc0000409: + return "l3_cache"; + + default: + WARN(1, "Funny MSR: 0x%08x\n", b->address); + return ""; + } +}; + + +static bool lvt_interrupt_supported(unsigned int bank, u32 msr_high_bits) +{ + /* + * bank 4 supports APIC LVT interrupts implicitly since forever. + */ + if (bank == 4) + return true; + + /* + * IntP: interrupt present; if this bit is set, the thresholding + * bank can generate APIC LVT interrupts + */ + return msr_high_bits & BIT(28); +} + +static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi) +{ + int msr = (hi & MASK_LVTOFF_HI) >> 20; + + if (apic < 0) { + pr_err(FW_BUG "cpu %d, failed to setup threshold interrupt " + "for bank %d, block %d (MSR%08X=0x%x%08x)\n", b->cpu, + b->bank, b->block, b->address, hi, lo); + return 0; + } + + if (apic != msr) { + /* + * On SMCA CPUs, LVT offset is programmed at a different MSR, and + * the BIOS provides the value. The original field where LVT offset + * was set is reserved. Return early here: + */ + if (mce_flags.smca) + return 0; + + pr_err(FW_BUG "cpu %d, invalid threshold interrupt offset %d " + "for bank %d, block %d (MSR%08X=0x%x%08x)\n", + b->cpu, apic, b->bank, b->block, b->address, hi, lo); + return 0; + } + + return 1; +}; + +/* Reprogram MCx_MISC MSR behind this threshold bank. */ +static void threshold_restart_bank(void *_tr) +{ + struct thresh_restart *tr = _tr; + u32 hi, lo; + + /* sysfs write might race against an offline operation */ + if (!this_cpu_read(threshold_banks) && !tr->set_lvt_off) + return; + + rdmsr(tr->b->address, lo, hi); + + if (tr->b->threshold_limit < (hi & THRESHOLD_MAX)) + tr->reset = 1; /* limit cannot be lower than err count */ + + if (tr->reset) { /* reset err count and overflow bit */ + hi = + (hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) | + (THRESHOLD_MAX - tr->b->threshold_limit); + } else if (tr->old_limit) { /* change limit w/o reset */ + int new_count = (hi & THRESHOLD_MAX) + + (tr->old_limit - tr->b->threshold_limit); + + hi = (hi & ~MASK_ERR_COUNT_HI) | + (new_count & THRESHOLD_MAX); + } + + /* clear IntType */ + hi &= ~MASK_INT_TYPE_HI; + + if (!tr->b->interrupt_capable) + goto done; + + if (tr->set_lvt_off) { + if (lvt_off_valid(tr->b, tr->lvt_off, lo, hi)) { + /* set new lvt offset */ + hi &= ~MASK_LVTOFF_HI; + hi |= tr->lvt_off << 20; + } + } + + if (tr->b->interrupt_enable) + hi |= INT_TYPE_APIC; + + done: + + hi |= MASK_COUNT_EN_HI; + wrmsr(tr->b->address, lo, hi); +} + +static void mce_threshold_block_init(struct threshold_block *b, int offset) +{ + struct thresh_restart tr = { + .b = b, + .set_lvt_off = 1, + .lvt_off = offset, + }; + + b->threshold_limit = THRESHOLD_MAX; + threshold_restart_bank(&tr); +}; + +static int setup_APIC_mce_threshold(int reserved, int new) +{ + if (reserved < 0 && !setup_APIC_eilvt(new, THRESHOLD_APIC_VECTOR, + APIC_EILVT_MSG_FIX, 0)) + return new; + + return reserved; +} + +static int setup_APIC_deferred_error(int reserved, int new) +{ + if (reserved < 0 && !setup_APIC_eilvt(new, DEFERRED_ERROR_VECTOR, + APIC_EILVT_MSG_FIX, 0)) + return new; + + return reserved; +} + +static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c) +{ + u32 low = 0, high = 0; + int def_offset = -1, def_new; + + if (rdmsr_safe(MSR_CU_DEF_ERR, &low, &high)) + return; + + def_new = (low & MASK_DEF_LVTOFF) >> 4; + if (!(low & MASK_DEF_LVTOFF)) { + pr_err(FW_BUG "Your BIOS is not setting up LVT offset 0x2 for deferred error IRQs correctly.\n"); + def_new = DEF_LVT_OFF; + low = (low & ~MASK_DEF_LVTOFF) | (DEF_LVT_OFF << 4); + } + + def_offset = setup_APIC_deferred_error(def_offset, def_new); + if ((def_offset == def_new) && + (deferred_error_int_vector != amd_deferred_error_interrupt)) + deferred_error_int_vector = amd_deferred_error_interrupt; + + if (!mce_flags.smca) + low = (low & ~MASK_DEF_INT_TYPE) | DEF_INT_TYPE_APIC; + + wrmsr(MSR_CU_DEF_ERR, low, high); +} + +static u32 smca_get_block_address(unsigned int bank, unsigned int block, + unsigned int cpu) +{ + if (!block) + return MSR_AMD64_SMCA_MCx_MISC(bank); + + if (!(per_cpu(smca_misc_banks_map, cpu) & BIT_ULL(bank))) + return 0; + + return MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1); +} + +static u32 get_block_address(u32 current_addr, u32 low, u32 high, + unsigned int bank, unsigned int block, + unsigned int cpu) +{ + u32 addr = 0, offset = 0; + + if ((bank >= per_cpu(mce_num_banks, cpu)) || (block >= NR_BLOCKS)) + return addr; + + if (mce_flags.smca) + return smca_get_block_address(bank, block, cpu); + + /* Fall back to method we used for older processors: */ + switch (block) { + case 0: + addr = mca_msr_reg(bank, MCA_MISC); + break; + case 1: + offset = ((low & MASK_BLKPTR_LO) >> 21); + if (offset) + addr = MCG_XBLK_ADDR + offset; + break; + default: + addr = ++current_addr; + } + return addr; +} + +static int +prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr, + int offset, u32 misc_high) +{ + unsigned int cpu = smp_processor_id(); + u32 smca_low, smca_high; + struct threshold_block b; + int new; + + if (!block) + per_cpu(bank_map, cpu) |= BIT_ULL(bank); + + memset(&b, 0, sizeof(b)); + b.cpu = cpu; + b.bank = bank; + b.block = block; + b.address = addr; + b.interrupt_capable = lvt_interrupt_supported(bank, misc_high); + + if (!b.interrupt_capable) + goto done; + + b.interrupt_enable = 1; + + if (!mce_flags.smca) { + new = (misc_high & MASK_LVTOFF_HI) >> 20; + goto set_offset; + } + + /* Gather LVT offset for thresholding: */ + if (rdmsr_safe(MSR_CU_DEF_ERR, &smca_low, &smca_high)) + goto out; + + new = (smca_low & SMCA_THR_LVT_OFF) >> 12; + +set_offset: + offset = setup_APIC_mce_threshold(offset, new); + if (offset == new) + thresholding_irq_en = true; + +done: + mce_threshold_block_init(&b, offset); + +out: + return offset; +} + +bool amd_filter_mce(struct mce *m) +{ + enum smca_bank_types bank_type = smca_get_bank_type(m->extcpu, m->bank); + struct cpuinfo_x86 *c = &boot_cpu_data; + + /* See Family 17h Models 10h-2Fh Erratum #1114. */ + if (c->x86 == 0x17 && + c->x86_model >= 0x10 && c->x86_model <= 0x2F && + bank_type == SMCA_IF && XEC(m->status, 0x3f) == 10) + return true; + + /* NB GART TLB error reporting is disabled by default. */ + if (c->x86 < 0x17) { + if (m->bank == 4 && XEC(m->status, 0x1f) == 0x5) + return true; + } + + return false; +} + +/* + * Turn off thresholding banks for the following conditions: + * - MC4_MISC thresholding is not supported on Family 0x15. + * - Prevent possible spurious interrupts from the IF bank on Family 0x17 + * Models 0x10-0x2F due to Erratum #1114. + */ +static void disable_err_thresholding(struct cpuinfo_x86 *c, unsigned int bank) +{ + int i, num_msrs; + u64 hwcr; + bool need_toggle; + u32 msrs[NR_BLOCKS]; + + if (c->x86 == 0x15 && bank == 4) { + msrs[0] = 0x00000413; /* MC4_MISC0 */ + msrs[1] = 0xc0000408; /* MC4_MISC1 */ + num_msrs = 2; + } else if (c->x86 == 0x17 && + (c->x86_model >= 0x10 && c->x86_model <= 0x2F)) { + + if (smca_get_bank_type(smp_processor_id(), bank) != SMCA_IF) + return; + + msrs[0] = MSR_AMD64_SMCA_MCx_MISC(bank); + num_msrs = 1; + } else { + return; + } + + rdmsrl(MSR_K7_HWCR, hwcr); + + /* McStatusWrEn has to be set */ + need_toggle = !(hwcr & BIT(18)); + if (need_toggle) + wrmsrl(MSR_K7_HWCR, hwcr | BIT(18)); + + /* Clear CntP bit safely */ + for (i = 0; i < num_msrs; i++) + msr_clear_bit(msrs[i], 62); + + /* restore old settings */ + if (need_toggle) + wrmsrl(MSR_K7_HWCR, hwcr); +} + +/* cpu init entry point, called from mce.c with preempt off */ +void mce_amd_feature_init(struct cpuinfo_x86 *c) +{ + unsigned int bank, block, cpu = smp_processor_id(); + u32 low = 0, high = 0, address = 0; + int offset = -1; + + + for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) { + if (mce_flags.smca) + smca_configure(bank, cpu); + + disable_err_thresholding(c, bank); + + for (block = 0; block < NR_BLOCKS; ++block) { + address = get_block_address(address, low, high, bank, block, cpu); + if (!address) + break; + + if (rdmsr_safe(address, &low, &high)) + break; + + if (!(high & MASK_VALID_HI)) + continue; + + if (!(high & MASK_CNTP_HI) || + (high & MASK_LOCKED_HI)) + continue; + + offset = prepare_threshold_block(bank, block, address, offset, high); + } + } + + if (mce_flags.succor) + deferred_error_interrupt_enable(c); +} + +bool amd_mce_is_memory_error(struct mce *m) +{ + enum smca_bank_types bank_type; + /* ErrCodeExt[20:16] */ + u8 xec = (m->status >> 16) & 0x1f; + + bank_type = smca_get_bank_type(m->extcpu, m->bank); + if (mce_flags.smca) + return (bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2) && xec == 0x0; + + return m->bank == 4 && xec == 0x8; +} + +static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc) +{ + struct mce m; + + mce_setup(&m); + + m.status = status; + m.misc = misc; + m.bank = bank; + m.tsc = rdtsc(); + + if (m.status & MCI_STATUS_ADDRV) { + m.addr = addr; + + smca_extract_err_addr(&m); + } + + if (mce_flags.smca) { + rdmsrl(MSR_AMD64_SMCA_MCx_IPID(bank), m.ipid); + + if (m.status & MCI_STATUS_SYNDV) + rdmsrl(MSR_AMD64_SMCA_MCx_SYND(bank), m.synd); + } + + mce_log(&m); +} + +DEFINE_IDTENTRY_SYSVEC(sysvec_deferred_error) +{ + trace_deferred_error_apic_entry(DEFERRED_ERROR_VECTOR); + inc_irq_stat(irq_deferred_error_count); + deferred_error_int_vector(); + trace_deferred_error_apic_exit(DEFERRED_ERROR_VECTOR); + apic_eoi(); +} + +/* + * Returns true if the logged error is deferred. False, otherwise. + */ +static inline bool +_log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc) +{ + u64 status, addr = 0; + + rdmsrl(msr_stat, status); + if (!(status & MCI_STATUS_VAL)) + return false; + + if (status & MCI_STATUS_ADDRV) + rdmsrl(msr_addr, addr); + + __log_error(bank, status, addr, misc); + + wrmsrl(msr_stat, 0); + + return status & MCI_STATUS_DEFERRED; +} + +static bool _log_error_deferred(unsigned int bank, u32 misc) +{ + if (!_log_error_bank(bank, mca_msr_reg(bank, MCA_STATUS), + mca_msr_reg(bank, MCA_ADDR), misc)) + return false; + + /* + * Non-SMCA systems don't have MCA_DESTAT/MCA_DEADDR registers. + * Return true here to avoid accessing these registers. + */ + if (!mce_flags.smca) + return true; + + /* Clear MCA_DESTAT if the deferred error was logged from MCA_STATUS. */ + wrmsrl(MSR_AMD64_SMCA_MCx_DESTAT(bank), 0); + return true; +} + +/* + * We have three scenarios for checking for Deferred errors: + * + * 1) Non-SMCA systems check MCA_STATUS and log error if found. + * 2) SMCA systems check MCA_STATUS. If error is found then log it and also + * clear MCA_DESTAT. + * 3) SMCA systems check MCA_DESTAT, if error was not found in MCA_STATUS, and + * log it. + */ +static void log_error_deferred(unsigned int bank) +{ + if (_log_error_deferred(bank, 0)) + return; + + /* + * Only deferred errors are logged in MCA_DE{STAT,ADDR} so just check + * for a valid error. + */ + _log_error_bank(bank, MSR_AMD64_SMCA_MCx_DESTAT(bank), + MSR_AMD64_SMCA_MCx_DEADDR(bank), 0); +} + +/* APIC interrupt handler for deferred errors */ +static void amd_deferred_error_interrupt(void) +{ + unsigned int bank; + + for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) + log_error_deferred(bank); +} + +static void log_error_thresholding(unsigned int bank, u64 misc) +{ + _log_error_deferred(bank, misc); +} + +static void log_and_reset_block(struct threshold_block *block) +{ + struct thresh_restart tr; + u32 low = 0, high = 0; + + if (!block) + return; + + if (rdmsr_safe(block->address, &low, &high)) + return; + + if (!(high & MASK_OVERFLOW_HI)) + return; + + /* Log the MCE which caused the threshold event. */ + log_error_thresholding(block->bank, ((u64)high << 32) | low); + + /* Reset threshold block after logging error. */ + memset(&tr, 0, sizeof(tr)); + tr.b = block; + threshold_restart_bank(&tr); +} + +/* + * Threshold interrupt handler will service THRESHOLD_APIC_VECTOR. The interrupt + * goes off when error_count reaches threshold_limit. + */ +static void amd_threshold_interrupt(void) +{ + struct threshold_block *first_block = NULL, *block = NULL, *tmp = NULL; + struct threshold_bank **bp = this_cpu_read(threshold_banks); + unsigned int bank, cpu = smp_processor_id(); + + /* + * Validate that the threshold bank has been initialized already. The + * handler is installed at boot time, but on a hotplug event the + * interrupt might fire before the data has been initialized. + */ + if (!bp) + return; + + for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) { + if (!(per_cpu(bank_map, cpu) & BIT_ULL(bank))) + continue; + + first_block = bp[bank]->blocks; + if (!first_block) + continue; + + /* + * The first block is also the head of the list. Check it first + * before iterating over the rest. + */ + log_and_reset_block(first_block); + list_for_each_entry_safe(block, tmp, &first_block->miscj, miscj) + log_and_reset_block(block); + } +} + +/* + * Sysfs Interface + */ + +struct threshold_attr { + struct attribute attr; + ssize_t (*show) (struct threshold_block *, char *); + ssize_t (*store) (struct threshold_block *, const char *, size_t count); +}; + +#define SHOW_FIELDS(name) \ +static ssize_t show_ ## name(struct threshold_block *b, char *buf) \ +{ \ + return sprintf(buf, "%lu\n", (unsigned long) b->name); \ +} +SHOW_FIELDS(interrupt_enable) +SHOW_FIELDS(threshold_limit) + +static ssize_t +store_interrupt_enable(struct threshold_block *b, const char *buf, size_t size) +{ + struct thresh_restart tr; + unsigned long new; + + if (!b->interrupt_capable) + return -EINVAL; + + if (kstrtoul(buf, 0, &new) < 0) + return -EINVAL; + + b->interrupt_enable = !!new; + + memset(&tr, 0, sizeof(tr)); + tr.b = b; + + if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1)) + return -ENODEV; + + return size; +} + +static ssize_t +store_threshold_limit(struct threshold_block *b, const char *buf, size_t size) +{ + struct thresh_restart tr; + unsigned long new; + + if (kstrtoul(buf, 0, &new) < 0) + return -EINVAL; + + if (new > THRESHOLD_MAX) + new = THRESHOLD_MAX; + if (new < 1) + new = 1; + + memset(&tr, 0, sizeof(tr)); + tr.old_limit = b->threshold_limit; + b->threshold_limit = new; + tr.b = b; + + if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1)) + return -ENODEV; + + return size; +} + +static ssize_t show_error_count(struct threshold_block *b, char *buf) +{ + u32 lo, hi; + + /* CPU might be offline by now */ + if (rdmsr_on_cpu(b->cpu, b->address, &lo, &hi)) + return -ENODEV; + + return sprintf(buf, "%u\n", ((hi & THRESHOLD_MAX) - + (THRESHOLD_MAX - b->threshold_limit))); +} + +static struct threshold_attr error_count = { + .attr = {.name = __stringify(error_count), .mode = 0444 }, + .show = show_error_count, +}; + +#define RW_ATTR(val) \ +static struct threshold_attr val = { \ + .attr = {.name = __stringify(val), .mode = 0644 }, \ + .show = show_## val, \ + .store = store_## val, \ +}; + +RW_ATTR(interrupt_enable); +RW_ATTR(threshold_limit); + +static struct attribute *default_attrs[] = { + &threshold_limit.attr, + &error_count.attr, + NULL, /* possibly interrupt_enable if supported, see below */ + NULL, +}; +ATTRIBUTE_GROUPS(default); + +#define to_block(k) container_of(k, struct threshold_block, kobj) +#define to_attr(a) container_of(a, struct threshold_attr, attr) + +static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) +{ + struct threshold_block *b = to_block(kobj); + struct threshold_attr *a = to_attr(attr); + ssize_t ret; + + ret = a->show ? a->show(b, buf) : -EIO; + + return ret; +} + +static ssize_t store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + struct threshold_block *b = to_block(kobj); + struct threshold_attr *a = to_attr(attr); + ssize_t ret; + + ret = a->store ? a->store(b, buf, count) : -EIO; + + return ret; +} + +static const struct sysfs_ops threshold_ops = { + .show = show, + .store = store, +}; + +static void threshold_block_release(struct kobject *kobj); + +static const struct kobj_type threshold_ktype = { + .sysfs_ops = &threshold_ops, + .default_groups = default_groups, + .release = threshold_block_release, +}; + +static const char *get_name(unsigned int cpu, unsigned int bank, struct threshold_block *b) +{ + enum smca_bank_types bank_type; + + if (!mce_flags.smca) { + if (b && bank == 4) + return bank4_names(b); + + return th_names[bank]; + } + + bank_type = smca_get_bank_type(cpu, bank); + if (bank_type >= N_SMCA_BANK_TYPES) + return NULL; + + if (b && (bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2)) { + if (b->block < ARRAY_SIZE(smca_umc_block_names)) + return smca_umc_block_names[b->block]; + return NULL; + } + + if (per_cpu(smca_bank_counts, cpu)[bank_type] == 1) + return smca_get_name(bank_type); + + snprintf(buf_mcatype, MAX_MCATYPE_NAME_LEN, + "%s_%u", smca_get_name(bank_type), + per_cpu(smca_banks, cpu)[bank].sysfs_id); + return buf_mcatype; +} + +static int allocate_threshold_blocks(unsigned int cpu, struct threshold_bank *tb, + unsigned int bank, unsigned int block, + u32 address) +{ + struct threshold_block *b = NULL; + u32 low, high; + int err; + + if ((bank >= this_cpu_read(mce_num_banks)) || (block >= NR_BLOCKS)) + return 0; + + if (rdmsr_safe(address, &low, &high)) + return 0; + + if (!(high & MASK_VALID_HI)) { + if (block) + goto recurse; + else + return 0; + } + + if (!(high & MASK_CNTP_HI) || + (high & MASK_LOCKED_HI)) + goto recurse; + + b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL); + if (!b) + return -ENOMEM; + + b->block = block; + b->bank = bank; + b->cpu = cpu; + b->address = address; + b->interrupt_enable = 0; + b->interrupt_capable = lvt_interrupt_supported(bank, high); + b->threshold_limit = THRESHOLD_MAX; + + if (b->interrupt_capable) { + default_attrs[2] = &interrupt_enable.attr; + b->interrupt_enable = 1; + } else { + default_attrs[2] = NULL; + } + + INIT_LIST_HEAD(&b->miscj); + + /* This is safe as @tb is not visible yet */ + if (tb->blocks) + list_add(&b->miscj, &tb->blocks->miscj); + else + tb->blocks = b; + + err = kobject_init_and_add(&b->kobj, &threshold_ktype, tb->kobj, get_name(cpu, bank, b)); + if (err) + goto out_free; +recurse: + address = get_block_address(address, low, high, bank, ++block, cpu); + if (!address) + return 0; + + err = allocate_threshold_blocks(cpu, tb, bank, block, address); + if (err) + goto out_free; + + if (b) + kobject_uevent(&b->kobj, KOBJ_ADD); + + return 0; + +out_free: + if (b) { + list_del(&b->miscj); + kobject_put(&b->kobj); + } + return err; +} + +static int __threshold_add_blocks(struct threshold_bank *b) +{ + struct list_head *head = &b->blocks->miscj; + struct threshold_block *pos = NULL; + struct threshold_block *tmp = NULL; + int err = 0; + + err = kobject_add(&b->blocks->kobj, b->kobj, b->blocks->kobj.name); + if (err) + return err; + + list_for_each_entry_safe(pos, tmp, head, miscj) { + + err = kobject_add(&pos->kobj, b->kobj, pos->kobj.name); + if (err) { + list_for_each_entry_safe_reverse(pos, tmp, head, miscj) + kobject_del(&pos->kobj); + + return err; + } + } + return err; +} + +static int threshold_create_bank(struct threshold_bank **bp, unsigned int cpu, + unsigned int bank) +{ + struct device *dev = this_cpu_read(mce_device); + struct amd_northbridge *nb = NULL; + struct threshold_bank *b = NULL; + const char *name = get_name(cpu, bank, NULL); + int err = 0; + + if (!dev) + return -ENODEV; + + if (is_shared_bank(bank)) { + nb = node_to_amd_nb(topology_die_id(cpu)); + + /* threshold descriptor already initialized on this node? */ + if (nb && nb->bank4) { + /* yes, use it */ + b = nb->bank4; + err = kobject_add(b->kobj, &dev->kobj, name); + if (err) + goto out; + + bp[bank] = b; + refcount_inc(&b->cpus); + + err = __threshold_add_blocks(b); + + goto out; + } + } + + b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL); + if (!b) { + err = -ENOMEM; + goto out; + } + + /* Associate the bank with the per-CPU MCE device */ + b->kobj = kobject_create_and_add(name, &dev->kobj); + if (!b->kobj) { + err = -EINVAL; + goto out_free; + } + + if (is_shared_bank(bank)) { + b->shared = 1; + refcount_set(&b->cpus, 1); + + /* nb is already initialized, see above */ + if (nb) { + WARN_ON(nb->bank4); + nb->bank4 = b; + } + } + + err = allocate_threshold_blocks(cpu, b, bank, 0, mca_msr_reg(bank, MCA_MISC)); + if (err) + goto out_kobj; + + bp[bank] = b; + return 0; + +out_kobj: + kobject_put(b->kobj); +out_free: + kfree(b); +out: + return err; +} + +static void threshold_block_release(struct kobject *kobj) +{ + kfree(to_block(kobj)); +} + +static void deallocate_threshold_blocks(struct threshold_bank *bank) +{ + struct threshold_block *pos, *tmp; + + list_for_each_entry_safe(pos, tmp, &bank->blocks->miscj, miscj) { + list_del(&pos->miscj); + kobject_put(&pos->kobj); + } + + kobject_put(&bank->blocks->kobj); +} + +static void __threshold_remove_blocks(struct threshold_bank *b) +{ + struct threshold_block *pos = NULL; + struct threshold_block *tmp = NULL; + + kobject_put(b->kobj); + + list_for_each_entry_safe(pos, tmp, &b->blocks->miscj, miscj) + kobject_put(b->kobj); +} + +static void threshold_remove_bank(struct threshold_bank *bank) +{ + struct amd_northbridge *nb; + + if (!bank->blocks) + goto out_free; + + if (!bank->shared) + goto out_dealloc; + + if (!refcount_dec_and_test(&bank->cpus)) { + __threshold_remove_blocks(bank); + return; + } else { + /* + * The last CPU on this node using the shared bank is going + * away, remove that bank now. + */ + nb = node_to_amd_nb(topology_die_id(smp_processor_id())); + nb->bank4 = NULL; + } + +out_dealloc: + deallocate_threshold_blocks(bank); + +out_free: + kobject_put(bank->kobj); + kfree(bank); +} + +static void __threshold_remove_device(struct threshold_bank **bp) +{ + unsigned int bank, numbanks = this_cpu_read(mce_num_banks); + + for (bank = 0; bank < numbanks; bank++) { + if (!bp[bank]) + continue; + + threshold_remove_bank(bp[bank]); + bp[bank] = NULL; + } + kfree(bp); +} + +int mce_threshold_remove_device(unsigned int cpu) +{ + struct threshold_bank **bp = this_cpu_read(threshold_banks); + + if (!bp) + return 0; + + /* + * Clear the pointer before cleaning up, so that the interrupt won't + * touch anything of this. + */ + this_cpu_write(threshold_banks, NULL); + + __threshold_remove_device(bp); + return 0; +} + +/** + * mce_threshold_create_device - Create the per-CPU MCE threshold device + * @cpu: The plugged in CPU + * + * Create directories and files for all valid threshold banks. + * + * This is invoked from the CPU hotplug callback which was installed in + * mcheck_init_device(). The invocation happens in context of the hotplug + * thread running on @cpu. The callback is invoked on all CPUs which are + * online when the callback is installed or during a real hotplug event. + */ +int mce_threshold_create_device(unsigned int cpu) +{ + unsigned int numbanks, bank; + struct threshold_bank **bp; + int err; + + if (!mce_flags.amd_threshold) + return 0; + + bp = this_cpu_read(threshold_banks); + if (bp) + return 0; + + numbanks = this_cpu_read(mce_num_banks); + bp = kcalloc(numbanks, sizeof(*bp), GFP_KERNEL); + if (!bp) + return -ENOMEM; + + for (bank = 0; bank < numbanks; ++bank) { + if (!(this_cpu_read(bank_map) & BIT_ULL(bank))) + continue; + err = threshold_create_bank(bp, cpu, bank); + if (err) { + __threshold_remove_device(bp); + return err; + } + } + this_cpu_write(threshold_banks, bp); + + if (thresholding_irq_en) + mce_threshold_vector = amd_threshold_interrupt; + return 0; +} |