1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 221afaf18SBorislav Petkov /* 321afaf18SBorislav Petkov * Machine check handler. 421afaf18SBorislav Petkov * 521afaf18SBorislav Petkov * K8 parts Copyright 2002,2003 Andi Kleen, SuSE Labs. 621afaf18SBorislav Petkov * Rest from unknown author(s). 721afaf18SBorislav Petkov * 2004 Andi Kleen. Rewrote most of it. 821afaf18SBorislav Petkov * Copyright 2008 Intel Corporation 921afaf18SBorislav Petkov * Author: Andi Kleen 1021afaf18SBorislav Petkov */ 1121afaf18SBorislav Petkov 1221afaf18SBorislav Petkov #include <linux/thread_info.h> 1321afaf18SBorislav Petkov #include <linux/capability.h> 1421afaf18SBorislav Petkov #include <linux/miscdevice.h> 1521afaf18SBorislav Petkov #include <linux/ratelimit.h> 1621afaf18SBorislav Petkov #include <linux/rcupdate.h> 1721afaf18SBorislav Petkov #include <linux/kobject.h> 1821afaf18SBorislav Petkov #include <linux/uaccess.h> 1921afaf18SBorislav Petkov #include <linux/kdebug.h> 2021afaf18SBorislav Petkov #include <linux/kernel.h> 2121afaf18SBorislav Petkov #include <linux/percpu.h> 2221afaf18SBorislav Petkov #include <linux/string.h> 2321afaf18SBorislav Petkov #include <linux/device.h> 2421afaf18SBorislav Petkov #include <linux/syscore_ops.h> 2521afaf18SBorislav Petkov #include <linux/delay.h> 2621afaf18SBorislav Petkov #include <linux/ctype.h> 2721afaf18SBorislav Petkov #include <linux/sched.h> 2821afaf18SBorislav Petkov #include <linux/sysfs.h> 2921afaf18SBorislav Petkov #include <linux/types.h> 3021afaf18SBorislav Petkov #include <linux/slab.h> 3121afaf18SBorislav Petkov #include <linux/init.h> 3221afaf18SBorislav Petkov #include <linux/kmod.h> 3321afaf18SBorislav Petkov #include <linux/poll.h> 3421afaf18SBorislav Petkov #include <linux/nmi.h> 3521afaf18SBorislav Petkov #include <linux/cpu.h> 3621afaf18SBorislav Petkov #include <linux/ras.h> 3721afaf18SBorislav Petkov #include <linux/smp.h> 3821afaf18SBorislav Petkov #include <linux/fs.h> 3921afaf18SBorislav Petkov #include <linux/mm.h> 4021afaf18SBorislav Petkov #include <linux/debugfs.h> 4121afaf18SBorislav Petkov #include <linux/irq_work.h> 4221afaf18SBorislav Petkov #include <linux/export.h> 4321afaf18SBorislav Petkov #include <linux/jump_label.h> 4421afaf18SBorislav Petkov #include <linux/set_memory.h> 459998a983SRicardo Neri #include <linux/sync_core.h> 465567d11cSPeter Zijlstra #include <linux/task_work.h> 470d00449cSPeter Zijlstra #include <linux/hardirq.h> 4821afaf18SBorislav Petkov 4921afaf18SBorislav Petkov #include <asm/intel-family.h> 5021afaf18SBorislav Petkov #include <asm/processor.h> 5121afaf18SBorislav Petkov #include <asm/traps.h> 5221afaf18SBorislav Petkov #include <asm/tlbflush.h> 5321afaf18SBorislav Petkov #include <asm/mce.h> 5421afaf18SBorislav Petkov #include <asm/msr.h> 5521afaf18SBorislav Petkov #include <asm/reboot.h> 5621afaf18SBorislav Petkov 5721afaf18SBorislav Petkov #include "internal.h" 5821afaf18SBorislav Petkov 5921afaf18SBorislav Petkov /* sysfs synchronization */ 6021afaf18SBorislav Petkov static DEFINE_MUTEX(mce_sysfs_mutex); 6121afaf18SBorislav Petkov 6221afaf18SBorislav Petkov #define CREATE_TRACE_POINTS 6321afaf18SBorislav Petkov #include <trace/events/mce.h> 6421afaf18SBorislav Petkov 6521afaf18SBorislav Petkov #define SPINUNIT 100 /* 100ns */ 6621afaf18SBorislav Petkov 6721afaf18SBorislav Petkov DEFINE_PER_CPU(unsigned, mce_exception_count); 6821afaf18SBorislav Petkov 69c7d314f3SYazen Ghannam DEFINE_PER_CPU_READ_MOSTLY(unsigned int, mce_num_banks); 70c7d314f3SYazen Ghannam 7195fdce6bSYazen Ghannam struct mce_bank { 7295fdce6bSYazen Ghannam u64 ctl; /* subevents to enable */ 7395fdce6bSYazen Ghannam bool init; /* initialise bank? */ 74b4914508SYazen Ghannam }; 75b4914508SYazen Ghannam static DEFINE_PER_CPU_READ_MOSTLY(struct mce_bank[MAX_NR_BANKS], mce_banks_array); 76b4914508SYazen Ghannam 77b4914508SYazen Ghannam #define ATTR_LEN 16 78b4914508SYazen Ghannam /* One object for each MCE bank, shared by all CPUs */ 79b4914508SYazen Ghannam struct mce_bank_dev { 8095fdce6bSYazen Ghannam struct device_attribute attr; /* device attribute */ 8195fdce6bSYazen Ghannam char attrname[ATTR_LEN]; /* attribute name */ 82b4914508SYazen Ghannam u8 bank; /* bank number */ 8395fdce6bSYazen Ghannam }; 84b4914508SYazen Ghannam static struct mce_bank_dev mce_bank_devs[MAX_NR_BANKS]; 8595fdce6bSYazen Ghannam 8621afaf18SBorislav Petkov struct mce_vendor_flags mce_flags __read_mostly; 8721afaf18SBorislav Petkov 8821afaf18SBorislav Petkov struct mca_config mca_cfg __read_mostly = { 8921afaf18SBorislav Petkov .bootlog = -1, 9021afaf18SBorislav Petkov /* 9121afaf18SBorislav Petkov * Tolerant levels: 9221afaf18SBorislav Petkov * 0: always panic on uncorrected errors, log corrected errors 9321afaf18SBorislav Petkov * 1: panic or SIGBUS on uncorrected errors, log corrected errors 9421afaf18SBorislav Petkov * 2: SIGBUS or log uncorrected errors (if possible), log corr. errors 9521afaf18SBorislav Petkov * 3: never panic or SIGBUS, log all errors (for testing only) 9621afaf18SBorislav Petkov */ 9721afaf18SBorislav Petkov .tolerant = 1, 9821afaf18SBorislav Petkov .monarch_timeout = -1 9921afaf18SBorislav Petkov }; 10021afaf18SBorislav Petkov 10121afaf18SBorislav Petkov static DEFINE_PER_CPU(struct mce, mces_seen); 10221afaf18SBorislav Petkov static unsigned long mce_need_notify; 10321afaf18SBorislav Petkov static int cpu_missing; 10421afaf18SBorislav Petkov 10521afaf18SBorislav Petkov /* 10621afaf18SBorislav Petkov * MCA banks polled by the period polling timer for corrected events. 10721afaf18SBorislav Petkov * With Intel CMCI, this only has MCA banks which do not support CMCI (if any). 10821afaf18SBorislav Petkov */ 10921afaf18SBorislav Petkov DEFINE_PER_CPU(mce_banks_t, mce_poll_banks) = { 11021afaf18SBorislav Petkov [0 ... BITS_TO_LONGS(MAX_NR_BANKS)-1] = ~0UL 11121afaf18SBorislav Petkov }; 11221afaf18SBorislav Petkov 11321afaf18SBorislav Petkov /* 11421afaf18SBorislav Petkov * MCA banks controlled through firmware first for corrected errors. 11521afaf18SBorislav Petkov * This is a global list of banks for which we won't enable CMCI and we 11621afaf18SBorislav Petkov * won't poll. Firmware controls these banks and is responsible for 11721afaf18SBorislav Petkov * reporting corrected errors through GHES. Uncorrected/recoverable 11821afaf18SBorislav Petkov * errors are still notified through a machine check. 11921afaf18SBorislav Petkov */ 12021afaf18SBorislav Petkov mce_banks_t mce_banks_ce_disabled; 12121afaf18SBorislav Petkov 12221afaf18SBorislav Petkov static struct work_struct mce_work; 12321afaf18SBorislav Petkov static struct irq_work mce_irq_work; 12421afaf18SBorislav Petkov 12521afaf18SBorislav Petkov static void (*quirk_no_way_out)(int bank, struct mce *m, struct pt_regs *regs); 12621afaf18SBorislav Petkov 12721afaf18SBorislav Petkov /* 12821afaf18SBorislav Petkov * CPU/chipset specific EDAC code can register a notifier call here to print 12921afaf18SBorislav Petkov * MCE errors in a human-readable form. 13021afaf18SBorislav Petkov */ 13121afaf18SBorislav Petkov BLOCKING_NOTIFIER_HEAD(x86_mce_decoder_chain); 13221afaf18SBorislav Petkov 13321afaf18SBorislav Petkov /* Do initial initialization of a struct mce */ 134865d3a9aSThomas Gleixner noinstr void mce_setup(struct mce *m) 13521afaf18SBorislav Petkov { 13621afaf18SBorislav Petkov memset(m, 0, sizeof(struct mce)); 13721afaf18SBorislav Petkov m->cpu = m->extcpu = smp_processor_id(); 13821afaf18SBorislav Petkov /* need the internal __ version to avoid deadlocks */ 13921afaf18SBorislav Petkov m->time = __ktime_get_real_seconds(); 14021afaf18SBorislav Petkov m->cpuvendor = boot_cpu_data.x86_vendor; 14121afaf18SBorislav Petkov m->cpuid = cpuid_eax(1); 14221afaf18SBorislav Petkov m->socketid = cpu_data(m->extcpu).phys_proc_id; 14321afaf18SBorislav Petkov m->apicid = cpu_data(m->extcpu).initial_apicid; 144865d3a9aSThomas Gleixner m->mcgcap = __rdmsr(MSR_IA32_MCG_CAP); 14521afaf18SBorislav Petkov 14621afaf18SBorislav Petkov if (this_cpu_has(X86_FEATURE_INTEL_PPIN)) 147865d3a9aSThomas Gleixner m->ppin = __rdmsr(MSR_PPIN); 148077168e2SWei Huang else if (this_cpu_has(X86_FEATURE_AMD_PPIN)) 149865d3a9aSThomas Gleixner m->ppin = __rdmsr(MSR_AMD_PPIN); 15021afaf18SBorislav Petkov 15121afaf18SBorislav Petkov m->microcode = boot_cpu_data.microcode; 15221afaf18SBorislav Petkov } 15321afaf18SBorislav Petkov 15421afaf18SBorislav Petkov DEFINE_PER_CPU(struct mce, injectm); 15521afaf18SBorislav Petkov EXPORT_PER_CPU_SYMBOL_GPL(injectm); 15621afaf18SBorislav Petkov 15721afaf18SBorislav Petkov void mce_log(struct mce *m) 15821afaf18SBorislav Petkov { 15921afaf18SBorislav Petkov if (!mce_gen_pool_add(m)) 16021afaf18SBorislav Petkov irq_work_queue(&mce_irq_work); 16121afaf18SBorislav Petkov } 16281736abdSJan H. Schönherr EXPORT_SYMBOL_GPL(mce_log); 16321afaf18SBorislav Petkov 16421afaf18SBorislav Petkov void mce_register_decode_chain(struct notifier_block *nb) 16521afaf18SBorislav Petkov { 16621afaf18SBorislav Petkov if (WARN_ON(nb->priority > MCE_PRIO_MCELOG && nb->priority < MCE_PRIO_EDAC)) 16721afaf18SBorislav Petkov return; 16821afaf18SBorislav Petkov 16921afaf18SBorislav Petkov blocking_notifier_chain_register(&x86_mce_decoder_chain, nb); 17021afaf18SBorislav Petkov } 17121afaf18SBorislav Petkov EXPORT_SYMBOL_GPL(mce_register_decode_chain); 17221afaf18SBorislav Petkov 17321afaf18SBorislav Petkov void mce_unregister_decode_chain(struct notifier_block *nb) 17421afaf18SBorislav Petkov { 17521afaf18SBorislav Petkov blocking_notifier_chain_unregister(&x86_mce_decoder_chain, nb); 17621afaf18SBorislav Petkov } 17721afaf18SBorislav Petkov EXPORT_SYMBOL_GPL(mce_unregister_decode_chain); 17821afaf18SBorislav Petkov 17921afaf18SBorislav Petkov static inline u32 ctl_reg(int bank) 18021afaf18SBorislav Petkov { 18121afaf18SBorislav Petkov return MSR_IA32_MCx_CTL(bank); 18221afaf18SBorislav Petkov } 18321afaf18SBorislav Petkov 18421afaf18SBorislav Petkov static inline u32 status_reg(int bank) 18521afaf18SBorislav Petkov { 18621afaf18SBorislav Petkov return MSR_IA32_MCx_STATUS(bank); 18721afaf18SBorislav Petkov } 18821afaf18SBorislav Petkov 18921afaf18SBorislav Petkov static inline u32 addr_reg(int bank) 19021afaf18SBorislav Petkov { 19121afaf18SBorislav Petkov return MSR_IA32_MCx_ADDR(bank); 19221afaf18SBorislav Petkov } 19321afaf18SBorislav Petkov 19421afaf18SBorislav Petkov static inline u32 misc_reg(int bank) 19521afaf18SBorislav Petkov { 19621afaf18SBorislav Petkov return MSR_IA32_MCx_MISC(bank); 19721afaf18SBorislav Petkov } 19821afaf18SBorislav Petkov 19921afaf18SBorislav Petkov static inline u32 smca_ctl_reg(int bank) 20021afaf18SBorislav Petkov { 20121afaf18SBorislav Petkov return MSR_AMD64_SMCA_MCx_CTL(bank); 20221afaf18SBorislav Petkov } 20321afaf18SBorislav Petkov 20421afaf18SBorislav Petkov static inline u32 smca_status_reg(int bank) 20521afaf18SBorislav Petkov { 20621afaf18SBorislav Petkov return MSR_AMD64_SMCA_MCx_STATUS(bank); 20721afaf18SBorislav Petkov } 20821afaf18SBorislav Petkov 20921afaf18SBorislav Petkov static inline u32 smca_addr_reg(int bank) 21021afaf18SBorislav Petkov { 21121afaf18SBorislav Petkov return MSR_AMD64_SMCA_MCx_ADDR(bank); 21221afaf18SBorislav Petkov } 21321afaf18SBorislav Petkov 21421afaf18SBorislav Petkov static inline u32 smca_misc_reg(int bank) 21521afaf18SBorislav Petkov { 21621afaf18SBorislav Petkov return MSR_AMD64_SMCA_MCx_MISC(bank); 21721afaf18SBorislav Petkov } 21821afaf18SBorislav Petkov 21921afaf18SBorislav Petkov struct mca_msr_regs msr_ops = { 22021afaf18SBorislav Petkov .ctl = ctl_reg, 22121afaf18SBorislav Petkov .status = status_reg, 22221afaf18SBorislav Petkov .addr = addr_reg, 22321afaf18SBorislav Petkov .misc = misc_reg 22421afaf18SBorislav Petkov }; 22521afaf18SBorislav Petkov 22621afaf18SBorislav Petkov static void __print_mce(struct mce *m) 22721afaf18SBorislav Petkov { 22821afaf18SBorislav Petkov pr_emerg(HW_ERR "CPU %d: Machine Check%s: %Lx Bank %d: %016Lx\n", 22921afaf18SBorislav Petkov m->extcpu, 23021afaf18SBorislav Petkov (m->mcgstatus & MCG_STATUS_MCIP ? " Exception" : ""), 23121afaf18SBorislav Petkov m->mcgstatus, m->bank, m->status); 23221afaf18SBorislav Petkov 23321afaf18SBorislav Petkov if (m->ip) { 23421afaf18SBorislav Petkov pr_emerg(HW_ERR "RIP%s %02x:<%016Lx> ", 23521afaf18SBorislav Petkov !(m->mcgstatus & MCG_STATUS_EIPV) ? " !INEXACT!" : "", 23621afaf18SBorislav Petkov m->cs, m->ip); 23721afaf18SBorislav Petkov 23821afaf18SBorislav Petkov if (m->cs == __KERNEL_CS) 23921afaf18SBorislav Petkov pr_cont("{%pS}", (void *)(unsigned long)m->ip); 24021afaf18SBorislav Petkov pr_cont("\n"); 24121afaf18SBorislav Petkov } 24221afaf18SBorislav Petkov 24321afaf18SBorislav Petkov pr_emerg(HW_ERR "TSC %llx ", m->tsc); 24421afaf18SBorislav Petkov if (m->addr) 24521afaf18SBorislav Petkov pr_cont("ADDR %llx ", m->addr); 24621afaf18SBorislav Petkov if (m->misc) 24721afaf18SBorislav Petkov pr_cont("MISC %llx ", m->misc); 248bb2de0adSSmita Koralahalli if (m->ppin) 249bb2de0adSSmita Koralahalli pr_cont("PPIN %llx ", m->ppin); 25021afaf18SBorislav Petkov 25121afaf18SBorislav Petkov if (mce_flags.smca) { 25221afaf18SBorislav Petkov if (m->synd) 25321afaf18SBorislav Petkov pr_cont("SYND %llx ", m->synd); 25421afaf18SBorislav Petkov if (m->ipid) 25521afaf18SBorislav Petkov pr_cont("IPID %llx ", m->ipid); 25621afaf18SBorislav Petkov } 25721afaf18SBorislav Petkov 25821afaf18SBorislav Petkov pr_cont("\n"); 259925946cfSTony Luck 26021afaf18SBorislav Petkov /* 26121afaf18SBorislav Petkov * Note this output is parsed by external tools and old fields 26221afaf18SBorislav Petkov * should not be changed. 26321afaf18SBorislav Petkov */ 26421afaf18SBorislav Petkov pr_emerg(HW_ERR "PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x microcode %x\n", 26521afaf18SBorislav Petkov m->cpuvendor, m->cpuid, m->time, m->socketid, m->apicid, 26621afaf18SBorislav Petkov m->microcode); 26721afaf18SBorislav Petkov } 26821afaf18SBorislav Petkov 26921afaf18SBorislav Petkov static void print_mce(struct mce *m) 27021afaf18SBorislav Petkov { 27121afaf18SBorislav Petkov __print_mce(m); 27221afaf18SBorislav Petkov 27321afaf18SBorislav Petkov if (m->cpuvendor != X86_VENDOR_AMD && m->cpuvendor != X86_VENDOR_HYGON) 27421afaf18SBorislav Petkov pr_emerg_ratelimited(HW_ERR "Run the above through 'mcelog --ascii'\n"); 27521afaf18SBorislav Petkov } 27621afaf18SBorislav Petkov 27721afaf18SBorislav Petkov #define PANIC_TIMEOUT 5 /* 5 seconds */ 27821afaf18SBorislav Petkov 27921afaf18SBorislav Petkov static atomic_t mce_panicked; 28021afaf18SBorislav Petkov 28121afaf18SBorislav Petkov static int fake_panic; 28221afaf18SBorislav Petkov static atomic_t mce_fake_panicked; 28321afaf18SBorislav Petkov 28421afaf18SBorislav Petkov /* Panic in progress. Enable interrupts and wait for final IPI */ 28521afaf18SBorislav Petkov static void wait_for_panic(void) 28621afaf18SBorislav Petkov { 28721afaf18SBorislav Petkov long timeout = PANIC_TIMEOUT*USEC_PER_SEC; 28821afaf18SBorislav Petkov 28921afaf18SBorislav Petkov preempt_disable(); 29021afaf18SBorislav Petkov local_irq_enable(); 29121afaf18SBorislav Petkov while (timeout-- > 0) 29221afaf18SBorislav Petkov udelay(1); 29321afaf18SBorislav Petkov if (panic_timeout == 0) 29421afaf18SBorislav Petkov panic_timeout = mca_cfg.panic_timeout; 29521afaf18SBorislav Petkov panic("Panicing machine check CPU died"); 29621afaf18SBorislav Petkov } 29721afaf18SBorislav Petkov 29821afaf18SBorislav Petkov static void mce_panic(const char *msg, struct mce *final, char *exp) 29921afaf18SBorislav Petkov { 30021afaf18SBorislav Petkov int apei_err = 0; 30121afaf18SBorislav Petkov struct llist_node *pending; 30221afaf18SBorislav Petkov struct mce_evt_llist *l; 30321afaf18SBorislav Petkov 30421afaf18SBorislav Petkov if (!fake_panic) { 30521afaf18SBorislav Petkov /* 30621afaf18SBorislav Petkov * Make sure only one CPU runs in machine check panic 30721afaf18SBorislav Petkov */ 30821afaf18SBorislav Petkov if (atomic_inc_return(&mce_panicked) > 1) 30921afaf18SBorislav Petkov wait_for_panic(); 31021afaf18SBorislav Petkov barrier(); 31121afaf18SBorislav Petkov 31221afaf18SBorislav Petkov bust_spinlocks(1); 31321afaf18SBorislav Petkov console_verbose(); 31421afaf18SBorislav Petkov } else { 31521afaf18SBorislav Petkov /* Don't log too much for fake panic */ 31621afaf18SBorislav Petkov if (atomic_inc_return(&mce_fake_panicked) > 1) 31721afaf18SBorislav Petkov return; 31821afaf18SBorislav Petkov } 31921afaf18SBorislav Petkov pending = mce_gen_pool_prepare_records(); 32021afaf18SBorislav Petkov /* First print corrected ones that are still unlogged */ 32121afaf18SBorislav Petkov llist_for_each_entry(l, pending, llnode) { 32221afaf18SBorislav Petkov struct mce *m = &l->mce; 32321afaf18SBorislav Petkov if (!(m->status & MCI_STATUS_UC)) { 32421afaf18SBorislav Petkov print_mce(m); 32521afaf18SBorislav Petkov if (!apei_err) 32621afaf18SBorislav Petkov apei_err = apei_write_mce(m); 32721afaf18SBorislav Petkov } 32821afaf18SBorislav Petkov } 32921afaf18SBorislav Petkov /* Now print uncorrected but with the final one last */ 33021afaf18SBorislav Petkov llist_for_each_entry(l, pending, llnode) { 33121afaf18SBorislav Petkov struct mce *m = &l->mce; 33221afaf18SBorislav Petkov if (!(m->status & MCI_STATUS_UC)) 33321afaf18SBorislav Petkov continue; 33421afaf18SBorislav Petkov if (!final || mce_cmp(m, final)) { 33521afaf18SBorislav Petkov print_mce(m); 33621afaf18SBorislav Petkov if (!apei_err) 33721afaf18SBorislav Petkov apei_err = apei_write_mce(m); 33821afaf18SBorislav Petkov } 33921afaf18SBorislav Petkov } 34021afaf18SBorislav Petkov if (final) { 34121afaf18SBorislav Petkov print_mce(final); 34221afaf18SBorislav Petkov if (!apei_err) 34321afaf18SBorislav Petkov apei_err = apei_write_mce(final); 34421afaf18SBorislav Petkov } 34521afaf18SBorislav Petkov if (cpu_missing) 34621afaf18SBorislav Petkov pr_emerg(HW_ERR "Some CPUs didn't answer in synchronization\n"); 34721afaf18SBorislav Petkov if (exp) 34821afaf18SBorislav Petkov pr_emerg(HW_ERR "Machine check: %s\n", exp); 34921afaf18SBorislav Petkov if (!fake_panic) { 35021afaf18SBorislav Petkov if (panic_timeout == 0) 35121afaf18SBorislav Petkov panic_timeout = mca_cfg.panic_timeout; 35221afaf18SBorislav Petkov panic(msg); 35321afaf18SBorislav Petkov } else 35421afaf18SBorislav Petkov pr_emerg(HW_ERR "Fake kernel panic: %s\n", msg); 35521afaf18SBorislav Petkov } 35621afaf18SBorislav Petkov 35721afaf18SBorislav Petkov /* Support code for software error injection */ 35821afaf18SBorislav Petkov 35921afaf18SBorislav Petkov static int msr_to_offset(u32 msr) 36021afaf18SBorislav Petkov { 36121afaf18SBorislav Petkov unsigned bank = __this_cpu_read(injectm.bank); 36221afaf18SBorislav Petkov 36321afaf18SBorislav Petkov if (msr == mca_cfg.rip_msr) 36421afaf18SBorislav Petkov return offsetof(struct mce, ip); 36521afaf18SBorislav Petkov if (msr == msr_ops.status(bank)) 36621afaf18SBorislav Petkov return offsetof(struct mce, status); 36721afaf18SBorislav Petkov if (msr == msr_ops.addr(bank)) 36821afaf18SBorislav Petkov return offsetof(struct mce, addr); 36921afaf18SBorislav Petkov if (msr == msr_ops.misc(bank)) 37021afaf18SBorislav Petkov return offsetof(struct mce, misc); 37121afaf18SBorislav Petkov if (msr == MSR_IA32_MCG_STATUS) 37221afaf18SBorislav Petkov return offsetof(struct mce, mcgstatus); 37321afaf18SBorislav Petkov return -1; 37421afaf18SBorislav Petkov } 37521afaf18SBorislav Petkov 376e2def7d4SBorislav Petkov __visible bool ex_handler_rdmsr_fault(const struct exception_table_entry *fixup, 377e2def7d4SBorislav Petkov struct pt_regs *regs, int trapnr, 378e2def7d4SBorislav Petkov unsigned long error_code, 379e2def7d4SBorislav Petkov unsigned long fault_addr) 380e2def7d4SBorislav Petkov { 381e2def7d4SBorislav Petkov pr_emerg("MSR access error: RDMSR from 0x%x at rIP: 0x%lx (%pS)\n", 382e2def7d4SBorislav Petkov (unsigned int)regs->cx, regs->ip, (void *)regs->ip); 383e2def7d4SBorislav Petkov 384e2def7d4SBorislav Petkov show_stack_regs(regs); 385e2def7d4SBorislav Petkov 386e2def7d4SBorislav Petkov panic("MCA architectural violation!\n"); 387e2def7d4SBorislav Petkov 388e2def7d4SBorislav Petkov while (true) 389e2def7d4SBorislav Petkov cpu_relax(); 390e2def7d4SBorislav Petkov 391e2def7d4SBorislav Petkov return true; 392e2def7d4SBorislav Petkov } 393e2def7d4SBorislav Petkov 39421afaf18SBorislav Petkov /* MSR access wrappers used for error injection */ 39521afaf18SBorislav Petkov static u64 mce_rdmsrl(u32 msr) 39621afaf18SBorislav Petkov { 397e2def7d4SBorislav Petkov DECLARE_ARGS(val, low, high); 39821afaf18SBorislav Petkov 39921afaf18SBorislav Petkov if (__this_cpu_read(injectm.finished)) { 40021afaf18SBorislav Petkov int offset = msr_to_offset(msr); 40121afaf18SBorislav Petkov 40221afaf18SBorislav Petkov if (offset < 0) 40321afaf18SBorislav Petkov return 0; 40421afaf18SBorislav Petkov return *(u64 *)((char *)this_cpu_ptr(&injectm) + offset); 40521afaf18SBorislav Petkov } 40621afaf18SBorislav Petkov 40721afaf18SBorislav Petkov /* 408e2def7d4SBorislav Petkov * RDMSR on MCA MSRs should not fault. If they do, this is very much an 409e2def7d4SBorislav Petkov * architectural violation and needs to be reported to hw vendor. Panic 410e2def7d4SBorislav Petkov * the box to not allow any further progress. 41121afaf18SBorislav Petkov */ 412e2def7d4SBorislav Petkov asm volatile("1: rdmsr\n" 413e2def7d4SBorislav Petkov "2:\n" 414e2def7d4SBorislav Petkov _ASM_EXTABLE_HANDLE(1b, 2b, ex_handler_rdmsr_fault) 415e2def7d4SBorislav Petkov : EAX_EDX_RET(val, low, high) : "c" (msr)); 416e2def7d4SBorislav Petkov 417e2def7d4SBorislav Petkov 418e2def7d4SBorislav Petkov return EAX_EDX_VAL(val, low, high); 41921afaf18SBorislav Petkov } 42021afaf18SBorislav Petkov 421e2def7d4SBorislav Petkov __visible bool ex_handler_wrmsr_fault(const struct exception_table_entry *fixup, 422e2def7d4SBorislav Petkov struct pt_regs *regs, int trapnr, 423e2def7d4SBorislav Petkov unsigned long error_code, 424e2def7d4SBorislav Petkov unsigned long fault_addr) 425e2def7d4SBorislav Petkov { 426e2def7d4SBorislav Petkov pr_emerg("MSR access error: WRMSR to 0x%x (tried to write 0x%08x%08x) at rIP: 0x%lx (%pS)\n", 427e2def7d4SBorislav Petkov (unsigned int)regs->cx, (unsigned int)regs->dx, (unsigned int)regs->ax, 428e2def7d4SBorislav Petkov regs->ip, (void *)regs->ip); 429e2def7d4SBorislav Petkov 430e2def7d4SBorislav Petkov show_stack_regs(regs); 431e2def7d4SBorislav Petkov 432e2def7d4SBorislav Petkov panic("MCA architectural violation!\n"); 433e2def7d4SBorislav Petkov 434e2def7d4SBorislav Petkov while (true) 435e2def7d4SBorislav Petkov cpu_relax(); 436e2def7d4SBorislav Petkov 437e2def7d4SBorislav Petkov return true; 43821afaf18SBorislav Petkov } 43921afaf18SBorislav Petkov 44021afaf18SBorislav Petkov static void mce_wrmsrl(u32 msr, u64 v) 44121afaf18SBorislav Petkov { 442e2def7d4SBorislav Petkov u32 low, high; 443e2def7d4SBorislav Petkov 44421afaf18SBorislav Petkov if (__this_cpu_read(injectm.finished)) { 44521afaf18SBorislav Petkov int offset = msr_to_offset(msr); 44621afaf18SBorislav Petkov 44721afaf18SBorislav Petkov if (offset >= 0) 44821afaf18SBorislav Petkov *(u64 *)((char *)this_cpu_ptr(&injectm) + offset) = v; 44921afaf18SBorislav Petkov return; 45021afaf18SBorislav Petkov } 451e2def7d4SBorislav Petkov 452e2def7d4SBorislav Petkov low = (u32)v; 453e2def7d4SBorislav Petkov high = (u32)(v >> 32); 454e2def7d4SBorislav Petkov 455e2def7d4SBorislav Petkov /* See comment in mce_rdmsrl() */ 456e2def7d4SBorislav Petkov asm volatile("1: wrmsr\n" 457e2def7d4SBorislav Petkov "2:\n" 458e2def7d4SBorislav Petkov _ASM_EXTABLE_HANDLE(1b, 2b, ex_handler_wrmsr_fault) 459e2def7d4SBorislav Petkov : : "c" (msr), "a"(low), "d" (high) : "memory"); 46021afaf18SBorislav Petkov } 46121afaf18SBorislav Petkov 46221afaf18SBorislav Petkov /* 46321afaf18SBorislav Petkov * Collect all global (w.r.t. this processor) status about this machine 46421afaf18SBorislav Petkov * check into our "mce" struct so that we can use it later to assess 46521afaf18SBorislav Petkov * the severity of the problem as we read per-bank specific details. 46621afaf18SBorislav Petkov */ 46721afaf18SBorislav Petkov static inline void mce_gather_info(struct mce *m, struct pt_regs *regs) 46821afaf18SBorislav Petkov { 46921afaf18SBorislav Petkov mce_setup(m); 47021afaf18SBorislav Petkov 47121afaf18SBorislav Petkov m->mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS); 47221afaf18SBorislav Petkov if (regs) { 47321afaf18SBorislav Petkov /* 47421afaf18SBorislav Petkov * Get the address of the instruction at the time of 47521afaf18SBorislav Petkov * the machine check error. 47621afaf18SBorislav Petkov */ 47721afaf18SBorislav Petkov if (m->mcgstatus & (MCG_STATUS_RIPV|MCG_STATUS_EIPV)) { 47821afaf18SBorislav Petkov m->ip = regs->ip; 47921afaf18SBorislav Petkov m->cs = regs->cs; 48021afaf18SBorislav Petkov 48121afaf18SBorislav Petkov /* 48221afaf18SBorislav Petkov * When in VM86 mode make the cs look like ring 3 48321afaf18SBorislav Petkov * always. This is a lie, but it's better than passing 48421afaf18SBorislav Petkov * the additional vm86 bit around everywhere. 48521afaf18SBorislav Petkov */ 48621afaf18SBorislav Petkov if (v8086_mode(regs)) 48721afaf18SBorislav Petkov m->cs |= 3; 48821afaf18SBorislav Petkov } 48921afaf18SBorislav Petkov /* Use accurate RIP reporting if available. */ 49021afaf18SBorislav Petkov if (mca_cfg.rip_msr) 49121afaf18SBorislav Petkov m->ip = mce_rdmsrl(mca_cfg.rip_msr); 49221afaf18SBorislav Petkov } 49321afaf18SBorislav Petkov } 49421afaf18SBorislav Petkov 49521afaf18SBorislav Petkov int mce_available(struct cpuinfo_x86 *c) 49621afaf18SBorislav Petkov { 49721afaf18SBorislav Petkov if (mca_cfg.disabled) 49821afaf18SBorislav Petkov return 0; 49921afaf18SBorislav Petkov return cpu_has(c, X86_FEATURE_MCE) && cpu_has(c, X86_FEATURE_MCA); 50021afaf18SBorislav Petkov } 50121afaf18SBorislav Petkov 50221afaf18SBorislav Petkov static void mce_schedule_work(void) 50321afaf18SBorislav Petkov { 50421afaf18SBorislav Petkov if (!mce_gen_pool_empty()) 50521afaf18SBorislav Petkov schedule_work(&mce_work); 50621afaf18SBorislav Petkov } 50721afaf18SBorislav Petkov 50821afaf18SBorislav Petkov static void mce_irq_work_cb(struct irq_work *entry) 50921afaf18SBorislav Petkov { 51021afaf18SBorislav Petkov mce_schedule_work(); 51121afaf18SBorislav Petkov } 51221afaf18SBorislav Petkov 51321afaf18SBorislav Petkov /* 51421afaf18SBorislav Petkov * Check if the address reported by the CPU is in a format we can parse. 51521afaf18SBorislav Petkov * It would be possible to add code for most other cases, but all would 51621afaf18SBorislav Petkov * be somewhat complicated (e.g. segment offset would require an instruction 51721afaf18SBorislav Petkov * parser). So only support physical addresses up to page granuality for now. 51821afaf18SBorislav Petkov */ 51921afaf18SBorislav Petkov int mce_usable_address(struct mce *m) 52021afaf18SBorislav Petkov { 52121afaf18SBorislav Petkov if (!(m->status & MCI_STATUS_ADDRV)) 52221afaf18SBorislav Petkov return 0; 52321afaf18SBorislav Petkov 5246e898d2bSTony W Wang-oc /* Checks after this one are Intel/Zhaoxin-specific: */ 5256e898d2bSTony W Wang-oc if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL && 5266e898d2bSTony W Wang-oc boot_cpu_data.x86_vendor != X86_VENDOR_ZHAOXIN) 52721afaf18SBorislav Petkov return 1; 52821afaf18SBorislav Petkov 52921afaf18SBorislav Petkov if (!(m->status & MCI_STATUS_MISCV)) 53021afaf18SBorislav Petkov return 0; 53121afaf18SBorislav Petkov 53221afaf18SBorislav Petkov if (MCI_MISC_ADDR_LSB(m->misc) > PAGE_SHIFT) 53321afaf18SBorislav Petkov return 0; 53421afaf18SBorislav Petkov 53521afaf18SBorislav Petkov if (MCI_MISC_ADDR_MODE(m->misc) != MCI_MISC_ADDR_PHYS) 53621afaf18SBorislav Petkov return 0; 53721afaf18SBorislav Petkov 53821afaf18SBorislav Petkov return 1; 53921afaf18SBorislav Petkov } 54021afaf18SBorislav Petkov EXPORT_SYMBOL_GPL(mce_usable_address); 54121afaf18SBorislav Petkov 54221afaf18SBorislav Petkov bool mce_is_memory_error(struct mce *m) 54321afaf18SBorislav Petkov { 5446e898d2bSTony W Wang-oc switch (m->cpuvendor) { 5456e898d2bSTony W Wang-oc case X86_VENDOR_AMD: 5466e898d2bSTony W Wang-oc case X86_VENDOR_HYGON: 54721afaf18SBorislav Petkov return amd_mce_is_memory_error(m); 5486e898d2bSTony W Wang-oc 5496e898d2bSTony W Wang-oc case X86_VENDOR_INTEL: 5506e898d2bSTony W Wang-oc case X86_VENDOR_ZHAOXIN: 55121afaf18SBorislav Petkov /* 55221afaf18SBorislav Petkov * Intel SDM Volume 3B - 15.9.2 Compound Error Codes 55321afaf18SBorislav Petkov * 55421afaf18SBorislav Petkov * Bit 7 of the MCACOD field of IA32_MCi_STATUS is used for 55521afaf18SBorislav Petkov * indicating a memory error. Bit 8 is used for indicating a 55621afaf18SBorislav Petkov * cache hierarchy error. The combination of bit 2 and bit 3 55721afaf18SBorislav Petkov * is used for indicating a `generic' cache hierarchy error 55821afaf18SBorislav Petkov * But we can't just blindly check the above bits, because if 55921afaf18SBorislav Petkov * bit 11 is set, then it is a bus/interconnect error - and 56021afaf18SBorislav Petkov * either way the above bits just gives more detail on what 56121afaf18SBorislav Petkov * bus/interconnect error happened. Note that bit 12 can be 56221afaf18SBorislav Petkov * ignored, as it's the "filter" bit. 56321afaf18SBorislav Petkov */ 56421afaf18SBorislav Petkov return (m->status & 0xef80) == BIT(7) || 56521afaf18SBorislav Petkov (m->status & 0xef00) == BIT(8) || 56621afaf18SBorislav Petkov (m->status & 0xeffc) == 0xc; 56721afaf18SBorislav Petkov 5686e898d2bSTony W Wang-oc default: 56921afaf18SBorislav Petkov return false; 57021afaf18SBorislav Petkov } 5716e898d2bSTony W Wang-oc } 57221afaf18SBorislav Petkov EXPORT_SYMBOL_GPL(mce_is_memory_error); 57321afaf18SBorislav Petkov 57417fae129STony Luck static bool whole_page(struct mce *m) 57517fae129STony Luck { 57617fae129STony Luck if (!mca_cfg.ser || !(m->status & MCI_STATUS_MISCV)) 57717fae129STony Luck return true; 57817fae129STony Luck 57917fae129STony Luck return MCI_MISC_ADDR_LSB(m->misc) >= PAGE_SHIFT; 58017fae129STony Luck } 58117fae129STony Luck 58221afaf18SBorislav Petkov bool mce_is_correctable(struct mce *m) 58321afaf18SBorislav Petkov { 58421afaf18SBorislav Petkov if (m->cpuvendor == X86_VENDOR_AMD && m->status & MCI_STATUS_DEFERRED) 58521afaf18SBorislav Petkov return false; 58621afaf18SBorislav Petkov 58721afaf18SBorislav Petkov if (m->cpuvendor == X86_VENDOR_HYGON && m->status & MCI_STATUS_DEFERRED) 58821afaf18SBorislav Petkov return false; 58921afaf18SBorislav Petkov 59021afaf18SBorislav Petkov if (m->status & MCI_STATUS_UC) 59121afaf18SBorislav Petkov return false; 59221afaf18SBorislav Petkov 59321afaf18SBorislav Petkov return true; 59421afaf18SBorislav Petkov } 59521afaf18SBorislav Petkov EXPORT_SYMBOL_GPL(mce_is_correctable); 59621afaf18SBorislav Petkov 597c9c6d216STony Luck static int mce_early_notifier(struct notifier_block *nb, unsigned long val, 59821afaf18SBorislav Petkov void *data) 59921afaf18SBorislav Petkov { 60021afaf18SBorislav Petkov struct mce *m = (struct mce *)data; 60121afaf18SBorislav Petkov 60221afaf18SBorislav Petkov if (!m) 60321afaf18SBorislav Petkov return NOTIFY_DONE; 60421afaf18SBorislav Petkov 60521afaf18SBorislav Petkov /* Emit the trace record: */ 60621afaf18SBorislav Petkov trace_mce_record(m); 60721afaf18SBorislav Petkov 60821afaf18SBorislav Petkov set_bit(0, &mce_need_notify); 60921afaf18SBorislav Petkov 61021afaf18SBorislav Petkov mce_notify_irq(); 61121afaf18SBorislav Petkov 61221afaf18SBorislav Petkov return NOTIFY_DONE; 61321afaf18SBorislav Petkov } 61421afaf18SBorislav Petkov 615c9c6d216STony Luck static struct notifier_block early_nb = { 616c9c6d216STony Luck .notifier_call = mce_early_notifier, 617c9c6d216STony Luck .priority = MCE_PRIO_EARLY, 61821afaf18SBorislav Petkov }; 61921afaf18SBorislav Petkov 6208438b84aSJan H. Schönherr static int uc_decode_notifier(struct notifier_block *nb, unsigned long val, 62121afaf18SBorislav Petkov void *data) 62221afaf18SBorislav Petkov { 62321afaf18SBorislav Petkov struct mce *mce = (struct mce *)data; 62421afaf18SBorislav Petkov unsigned long pfn; 62521afaf18SBorislav Petkov 6268438b84aSJan H. Schönherr if (!mce || !mce_usable_address(mce)) 62721afaf18SBorislav Petkov return NOTIFY_DONE; 62821afaf18SBorislav Petkov 6298438b84aSJan H. Schönherr if (mce->severity != MCE_AO_SEVERITY && 6308438b84aSJan H. Schönherr mce->severity != MCE_DEFERRED_SEVERITY) 6318438b84aSJan H. Schönherr return NOTIFY_DONE; 6328438b84aSJan H. Schönherr 63321afaf18SBorislav Petkov pfn = mce->addr >> PAGE_SHIFT; 63423ba710aSTony Luck if (!memory_failure(pfn, 0)) { 63517fae129STony Luck set_mce_nospec(pfn, whole_page(mce)); 63623ba710aSTony Luck mce->kflags |= MCE_HANDLED_UC; 63723ba710aSTony Luck } 63821afaf18SBorislav Petkov 63921afaf18SBorislav Petkov return NOTIFY_OK; 64021afaf18SBorislav Petkov } 6418438b84aSJan H. Schönherr 6428438b84aSJan H. Schönherr static struct notifier_block mce_uc_nb = { 6438438b84aSJan H. Schönherr .notifier_call = uc_decode_notifier, 6448438b84aSJan H. Schönherr .priority = MCE_PRIO_UC, 64521afaf18SBorislav Petkov }; 64621afaf18SBorislav Petkov 64721afaf18SBorislav Petkov static int mce_default_notifier(struct notifier_block *nb, unsigned long val, 64821afaf18SBorislav Petkov void *data) 64921afaf18SBorislav Petkov { 65021afaf18SBorislav Petkov struct mce *m = (struct mce *)data; 65121afaf18SBorislav Petkov 65221afaf18SBorislav Petkov if (!m) 65321afaf18SBorislav Petkov return NOTIFY_DONE; 65421afaf18SBorislav Petkov 65543505646STony Luck if (mca_cfg.print_all || !m->kflags) 65621afaf18SBorislav Petkov __print_mce(m); 65721afaf18SBorislav Petkov 65821afaf18SBorislav Petkov return NOTIFY_DONE; 65921afaf18SBorislav Petkov } 66021afaf18SBorislav Petkov 66121afaf18SBorislav Petkov static struct notifier_block mce_default_nb = { 66221afaf18SBorislav Petkov .notifier_call = mce_default_notifier, 66321afaf18SBorislav Petkov /* lowest prio, we want it to run last. */ 66421afaf18SBorislav Petkov .priority = MCE_PRIO_LOWEST, 66521afaf18SBorislav Petkov }; 66621afaf18SBorislav Petkov 66721afaf18SBorislav Petkov /* 66821afaf18SBorislav Petkov * Read ADDR and MISC registers. 66921afaf18SBorislav Petkov */ 67021afaf18SBorislav Petkov static void mce_read_aux(struct mce *m, int i) 67121afaf18SBorislav Petkov { 67221afaf18SBorislav Petkov if (m->status & MCI_STATUS_MISCV) 67321afaf18SBorislav Petkov m->misc = mce_rdmsrl(msr_ops.misc(i)); 67421afaf18SBorislav Petkov 67521afaf18SBorislav Petkov if (m->status & MCI_STATUS_ADDRV) { 67621afaf18SBorislav Petkov m->addr = mce_rdmsrl(msr_ops.addr(i)); 67721afaf18SBorislav Petkov 67821afaf18SBorislav Petkov /* 67921afaf18SBorislav Petkov * Mask the reported address by the reported granularity. 68021afaf18SBorislav Petkov */ 68121afaf18SBorislav Petkov if (mca_cfg.ser && (m->status & MCI_STATUS_MISCV)) { 68221afaf18SBorislav Petkov u8 shift = MCI_MISC_ADDR_LSB(m->misc); 68321afaf18SBorislav Petkov m->addr >>= shift; 68421afaf18SBorislav Petkov m->addr <<= shift; 68521afaf18SBorislav Petkov } 68621afaf18SBorislav Petkov 68721afaf18SBorislav Petkov /* 68821afaf18SBorislav Petkov * Extract [55:<lsb>] where lsb is the least significant 68921afaf18SBorislav Petkov * *valid* bit of the address bits. 69021afaf18SBorislav Petkov */ 69121afaf18SBorislav Petkov if (mce_flags.smca) { 69221afaf18SBorislav Petkov u8 lsb = (m->addr >> 56) & 0x3f; 69321afaf18SBorislav Petkov 69421afaf18SBorislav Petkov m->addr &= GENMASK_ULL(55, lsb); 69521afaf18SBorislav Petkov } 69621afaf18SBorislav Petkov } 69721afaf18SBorislav Petkov 69821afaf18SBorislav Petkov if (mce_flags.smca) { 69921afaf18SBorislav Petkov m->ipid = mce_rdmsrl(MSR_AMD64_SMCA_MCx_IPID(i)); 70021afaf18SBorislav Petkov 70121afaf18SBorislav Petkov if (m->status & MCI_STATUS_SYNDV) 70221afaf18SBorislav Petkov m->synd = mce_rdmsrl(MSR_AMD64_SMCA_MCx_SYND(i)); 70321afaf18SBorislav Petkov } 70421afaf18SBorislav Petkov } 70521afaf18SBorislav Petkov 70621afaf18SBorislav Petkov DEFINE_PER_CPU(unsigned, mce_poll_count); 70721afaf18SBorislav Petkov 70821afaf18SBorislav Petkov /* 70921afaf18SBorislav Petkov * Poll for corrected events or events that happened before reset. 71021afaf18SBorislav Petkov * Those are just logged through /dev/mcelog. 71121afaf18SBorislav Petkov * 71221afaf18SBorislav Petkov * This is executed in standard interrupt context. 71321afaf18SBorislav Petkov * 71421afaf18SBorislav Petkov * Note: spec recommends to panic for fatal unsignalled 71521afaf18SBorislav Petkov * errors here. However this would be quite problematic -- 71621afaf18SBorislav Petkov * we would need to reimplement the Monarch handling and 71721afaf18SBorislav Petkov * it would mess up the exclusion between exception handler 718312a4661SLinus Torvalds * and poll handler -- * so we skip this for now. 71921afaf18SBorislav Petkov * These cases should not happen anyways, or only when the CPU 72021afaf18SBorislav Petkov * is already totally * confused. In this case it's likely it will 72121afaf18SBorislav Petkov * not fully execute the machine check handler either. 72221afaf18SBorislav Petkov */ 72321afaf18SBorislav Petkov bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b) 72421afaf18SBorislav Petkov { 725b4914508SYazen Ghannam struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array); 72621afaf18SBorislav Petkov bool error_seen = false; 72721afaf18SBorislav Petkov struct mce m; 72821afaf18SBorislav Petkov int i; 72921afaf18SBorislav Petkov 73021afaf18SBorislav Petkov this_cpu_inc(mce_poll_count); 73121afaf18SBorislav Petkov 73221afaf18SBorislav Petkov mce_gather_info(&m, NULL); 73321afaf18SBorislav Petkov 73421afaf18SBorislav Petkov if (flags & MCP_TIMESTAMP) 73521afaf18SBorislav Petkov m.tsc = rdtsc(); 73621afaf18SBorislav Petkov 737c7d314f3SYazen Ghannam for (i = 0; i < this_cpu_read(mce_num_banks); i++) { 73821afaf18SBorislav Petkov if (!mce_banks[i].ctl || !test_bit(i, *b)) 73921afaf18SBorislav Petkov continue; 74021afaf18SBorislav Petkov 74121afaf18SBorislav Petkov m.misc = 0; 74221afaf18SBorislav Petkov m.addr = 0; 74321afaf18SBorislav Petkov m.bank = i; 74421afaf18SBorislav Petkov 74521afaf18SBorislav Petkov barrier(); 74621afaf18SBorislav Petkov m.status = mce_rdmsrl(msr_ops.status(i)); 747f19501aaSTony Luck 748f19501aaSTony Luck /* If this entry is not valid, ignore it */ 74921afaf18SBorislav Petkov if (!(m.status & MCI_STATUS_VAL)) 75021afaf18SBorislav Petkov continue; 75121afaf18SBorislav Petkov 75221afaf18SBorislav Petkov /* 753f19501aaSTony Luck * If we are logging everything (at CPU online) or this 754f19501aaSTony Luck * is a corrected error, then we must log it. 75521afaf18SBorislav Petkov */ 756f19501aaSTony Luck if ((flags & MCP_UC) || !(m.status & MCI_STATUS_UC)) 757f19501aaSTony Luck goto log_it; 758f19501aaSTony Luck 759f19501aaSTony Luck /* 760f19501aaSTony Luck * Newer Intel systems that support software error 761f19501aaSTony Luck * recovery need to make additional checks. Other 762f19501aaSTony Luck * CPUs should skip over uncorrected errors, but log 763f19501aaSTony Luck * everything else. 764f19501aaSTony Luck */ 765f19501aaSTony Luck if (!mca_cfg.ser) { 766f19501aaSTony Luck if (m.status & MCI_STATUS_UC) 767f19501aaSTony Luck continue; 768f19501aaSTony Luck goto log_it; 769f19501aaSTony Luck } 770f19501aaSTony Luck 771f19501aaSTony Luck /* Log "not enabled" (speculative) errors */ 772f19501aaSTony Luck if (!(m.status & MCI_STATUS_EN)) 773f19501aaSTony Luck goto log_it; 774f19501aaSTony Luck 775f19501aaSTony Luck /* 776f19501aaSTony Luck * Log UCNA (SDM: 15.6.3 "UCR Error Classification") 777f19501aaSTony Luck * UC == 1 && PCC == 0 && S == 0 778f19501aaSTony Luck */ 779f19501aaSTony Luck if (!(m.status & MCI_STATUS_PCC) && !(m.status & MCI_STATUS_S)) 780f19501aaSTony Luck goto log_it; 781f19501aaSTony Luck 782f19501aaSTony Luck /* 783f19501aaSTony Luck * Skip anything else. Presumption is that our read of this 784f19501aaSTony Luck * bank is racing with a machine check. Leave the log alone 785f19501aaSTony Luck * for do_machine_check() to deal with it. 786f19501aaSTony Luck */ 78721afaf18SBorislav Petkov continue; 78821afaf18SBorislav Petkov 789f19501aaSTony Luck log_it: 79021afaf18SBorislav Petkov error_seen = true; 79121afaf18SBorislav Petkov 79290454e49SJan H. Schönherr if (flags & MCP_DONTLOG) 79390454e49SJan H. Schönherr goto clear_it; 79490454e49SJan H. Schönherr 79521afaf18SBorislav Petkov mce_read_aux(&m, i); 79621afaf18SBorislav Petkov m.severity = mce_severity(&m, mca_cfg.tolerant, NULL, false); 79721afaf18SBorislav Petkov /* 79821afaf18SBorislav Petkov * Don't get the IP here because it's unlikely to 79921afaf18SBorislav Petkov * have anything to do with the actual error location. 80021afaf18SBorislav Petkov */ 80121afaf18SBorislav Petkov 80290454e49SJan H. Schönherr if (mca_cfg.dont_log_ce && !mce_usable_address(&m)) 80390454e49SJan H. Schönherr goto clear_it; 80490454e49SJan H. Schönherr 80590454e49SJan H. Schönherr mce_log(&m); 80690454e49SJan H. Schönherr 80790454e49SJan H. Schönherr clear_it: 80821afaf18SBorislav Petkov /* 80921afaf18SBorislav Petkov * Clear state for this bank. 81021afaf18SBorislav Petkov */ 81121afaf18SBorislav Petkov mce_wrmsrl(msr_ops.status(i), 0); 81221afaf18SBorislav Petkov } 81321afaf18SBorislav Petkov 81421afaf18SBorislav Petkov /* 81521afaf18SBorislav Petkov * Don't clear MCG_STATUS here because it's only defined for 81621afaf18SBorislav Petkov * exceptions. 81721afaf18SBorislav Petkov */ 81821afaf18SBorislav Petkov 81921afaf18SBorislav Petkov sync_core(); 82021afaf18SBorislav Petkov 82121afaf18SBorislav Petkov return error_seen; 82221afaf18SBorislav Petkov } 82321afaf18SBorislav Petkov EXPORT_SYMBOL_GPL(machine_check_poll); 82421afaf18SBorislav Petkov 82521afaf18SBorislav Petkov /* 82621afaf18SBorislav Petkov * Do a quick check if any of the events requires a panic. 82721afaf18SBorislav Petkov * This decides if we keep the events around or clear them. 82821afaf18SBorislav Petkov */ 82921afaf18SBorislav Petkov static int mce_no_way_out(struct mce *m, char **msg, unsigned long *validp, 83021afaf18SBorislav Petkov struct pt_regs *regs) 83121afaf18SBorislav Petkov { 8327a8bc2b0SJan H. Schönherr char *tmp = *msg; 83321afaf18SBorislav Petkov int i; 83421afaf18SBorislav Petkov 835c7d314f3SYazen Ghannam for (i = 0; i < this_cpu_read(mce_num_banks); i++) { 83621afaf18SBorislav Petkov m->status = mce_rdmsrl(msr_ops.status(i)); 83721afaf18SBorislav Petkov if (!(m->status & MCI_STATUS_VAL)) 83821afaf18SBorislav Petkov continue; 83921afaf18SBorislav Petkov 84021afaf18SBorislav Petkov __set_bit(i, validp); 84121afaf18SBorislav Petkov if (quirk_no_way_out) 84221afaf18SBorislav Petkov quirk_no_way_out(i, m, regs); 84321afaf18SBorislav Petkov 844d28af26fSTony Luck m->bank = i; 845a3a57ddaSJan H. Schönherr if (mce_severity(m, mca_cfg.tolerant, &tmp, true) >= MCE_PANIC_SEVERITY) { 84621afaf18SBorislav Petkov mce_read_aux(m, i); 84721afaf18SBorislav Petkov *msg = tmp; 84821afaf18SBorislav Petkov return 1; 84921afaf18SBorislav Petkov } 85021afaf18SBorislav Petkov } 85121afaf18SBorislav Petkov return 0; 85221afaf18SBorislav Petkov } 85321afaf18SBorislav Petkov 85421afaf18SBorislav Petkov /* 85521afaf18SBorislav Petkov * Variable to establish order between CPUs while scanning. 85621afaf18SBorislav Petkov * Each CPU spins initially until executing is equal its number. 85721afaf18SBorislav Petkov */ 85821afaf18SBorislav Petkov static atomic_t mce_executing; 85921afaf18SBorislav Petkov 86021afaf18SBorislav Petkov /* 86121afaf18SBorislav Petkov * Defines order of CPUs on entry. First CPU becomes Monarch. 86221afaf18SBorislav Petkov */ 86321afaf18SBorislav Petkov static atomic_t mce_callin; 86421afaf18SBorislav Petkov 86521afaf18SBorislav Petkov /* 86621afaf18SBorislav Petkov * Check if a timeout waiting for other CPUs happened. 86721afaf18SBorislav Petkov */ 86821afaf18SBorislav Petkov static int mce_timed_out(u64 *t, const char *msg) 86921afaf18SBorislav Petkov { 87021afaf18SBorislav Petkov /* 87121afaf18SBorislav Petkov * The others already did panic for some reason. 87221afaf18SBorislav Petkov * Bail out like in a timeout. 87321afaf18SBorislav Petkov * rmb() to tell the compiler that system_state 87421afaf18SBorislav Petkov * might have been modified by someone else. 87521afaf18SBorislav Petkov */ 87621afaf18SBorislav Petkov rmb(); 87721afaf18SBorislav Petkov if (atomic_read(&mce_panicked)) 87821afaf18SBorislav Petkov wait_for_panic(); 87921afaf18SBorislav Petkov if (!mca_cfg.monarch_timeout) 88021afaf18SBorislav Petkov goto out; 88121afaf18SBorislav Petkov if ((s64)*t < SPINUNIT) { 88221afaf18SBorislav Petkov if (mca_cfg.tolerant <= 1) 88321afaf18SBorislav Petkov mce_panic(msg, NULL, NULL); 88421afaf18SBorislav Petkov cpu_missing = 1; 88521afaf18SBorislav Petkov return 1; 88621afaf18SBorislav Petkov } 88721afaf18SBorislav Petkov *t -= SPINUNIT; 88821afaf18SBorislav Petkov out: 88921afaf18SBorislav Petkov touch_nmi_watchdog(); 89021afaf18SBorislav Petkov return 0; 89121afaf18SBorislav Petkov } 89221afaf18SBorislav Petkov 89321afaf18SBorislav Petkov /* 89421afaf18SBorislav Petkov * The Monarch's reign. The Monarch is the CPU who entered 89521afaf18SBorislav Petkov * the machine check handler first. It waits for the others to 89621afaf18SBorislav Petkov * raise the exception too and then grades them. When any 89721afaf18SBorislav Petkov * error is fatal panic. Only then let the others continue. 89821afaf18SBorislav Petkov * 89921afaf18SBorislav Petkov * The other CPUs entering the MCE handler will be controlled by the 90021afaf18SBorislav Petkov * Monarch. They are called Subjects. 90121afaf18SBorislav Petkov * 90221afaf18SBorislav Petkov * This way we prevent any potential data corruption in a unrecoverable case 90321afaf18SBorislav Petkov * and also makes sure always all CPU's errors are examined. 90421afaf18SBorislav Petkov * 90521afaf18SBorislav Petkov * Also this detects the case of a machine check event coming from outer 90621afaf18SBorislav Petkov * space (not detected by any CPUs) In this case some external agent wants 90721afaf18SBorislav Petkov * us to shut down, so panic too. 90821afaf18SBorislav Petkov * 90921afaf18SBorislav Petkov * The other CPUs might still decide to panic if the handler happens 91021afaf18SBorislav Petkov * in a unrecoverable place, but in this case the system is in a semi-stable 91121afaf18SBorislav Petkov * state and won't corrupt anything by itself. It's ok to let the others 91221afaf18SBorislav Petkov * continue for a bit first. 91321afaf18SBorislav Petkov * 91421afaf18SBorislav Petkov * All the spin loops have timeouts; when a timeout happens a CPU 91521afaf18SBorislav Petkov * typically elects itself to be Monarch. 91621afaf18SBorislav Petkov */ 91721afaf18SBorislav Petkov static void mce_reign(void) 91821afaf18SBorislav Petkov { 91921afaf18SBorislav Petkov int cpu; 92021afaf18SBorislav Petkov struct mce *m = NULL; 92121afaf18SBorislav Petkov int global_worst = 0; 92221afaf18SBorislav Petkov char *msg = NULL; 92321afaf18SBorislav Petkov 92421afaf18SBorislav Petkov /* 92521afaf18SBorislav Petkov * This CPU is the Monarch and the other CPUs have run 92621afaf18SBorislav Petkov * through their handlers. 92721afaf18SBorislav Petkov * Grade the severity of the errors of all the CPUs. 92821afaf18SBorislav Petkov */ 92921afaf18SBorislav Petkov for_each_possible_cpu(cpu) { 93013c877f4STony Luck struct mce *mtmp = &per_cpu(mces_seen, cpu); 93113c877f4STony Luck 93213c877f4STony Luck if (mtmp->severity > global_worst) { 93313c877f4STony Luck global_worst = mtmp->severity; 93421afaf18SBorislav Petkov m = &per_cpu(mces_seen, cpu); 93521afaf18SBorislav Petkov } 93621afaf18SBorislav Petkov } 93721afaf18SBorislav Petkov 93821afaf18SBorislav Petkov /* 93921afaf18SBorislav Petkov * Cannot recover? Panic here then. 94021afaf18SBorislav Petkov * This dumps all the mces in the log buffer and stops the 94121afaf18SBorislav Petkov * other CPUs. 94221afaf18SBorislav Petkov */ 94313c877f4STony Luck if (m && global_worst >= MCE_PANIC_SEVERITY && mca_cfg.tolerant < 3) { 94413c877f4STony Luck /* call mce_severity() to get "msg" for panic */ 94513c877f4STony Luck mce_severity(m, mca_cfg.tolerant, &msg, true); 94621afaf18SBorislav Petkov mce_panic("Fatal machine check", m, msg); 94713c877f4STony Luck } 94821afaf18SBorislav Petkov 94921afaf18SBorislav Petkov /* 95021afaf18SBorislav Petkov * For UC somewhere we let the CPU who detects it handle it. 95121afaf18SBorislav Petkov * Also must let continue the others, otherwise the handling 95221afaf18SBorislav Petkov * CPU could deadlock on a lock. 95321afaf18SBorislav Petkov */ 95421afaf18SBorislav Petkov 95521afaf18SBorislav Petkov /* 95621afaf18SBorislav Petkov * No machine check event found. Must be some external 95721afaf18SBorislav Petkov * source or one CPU is hung. Panic. 95821afaf18SBorislav Petkov */ 95921afaf18SBorislav Petkov if (global_worst <= MCE_KEEP_SEVERITY && mca_cfg.tolerant < 3) 96021afaf18SBorislav Petkov mce_panic("Fatal machine check from unknown source", NULL, NULL); 96121afaf18SBorislav Petkov 96221afaf18SBorislav Petkov /* 96321afaf18SBorislav Petkov * Now clear all the mces_seen so that they don't reappear on 96421afaf18SBorislav Petkov * the next mce. 96521afaf18SBorislav Petkov */ 96621afaf18SBorislav Petkov for_each_possible_cpu(cpu) 96721afaf18SBorislav Petkov memset(&per_cpu(mces_seen, cpu), 0, sizeof(struct mce)); 96821afaf18SBorislav Petkov } 96921afaf18SBorislav Petkov 97021afaf18SBorislav Petkov static atomic_t global_nwo; 97121afaf18SBorislav Petkov 97221afaf18SBorislav Petkov /* 97321afaf18SBorislav Petkov * Start of Monarch synchronization. This waits until all CPUs have 97421afaf18SBorislav Petkov * entered the exception handler and then determines if any of them 97521afaf18SBorislav Petkov * saw a fatal event that requires panic. Then it executes them 97621afaf18SBorislav Petkov * in the entry order. 97721afaf18SBorislav Petkov * TBD double check parallel CPU hotunplug 97821afaf18SBorislav Petkov */ 97921afaf18SBorislav Petkov static int mce_start(int *no_way_out) 98021afaf18SBorislav Petkov { 98121afaf18SBorislav Petkov int order; 98221afaf18SBorislav Petkov int cpus = num_online_cpus(); 98321afaf18SBorislav Petkov u64 timeout = (u64)mca_cfg.monarch_timeout * NSEC_PER_USEC; 98421afaf18SBorislav Petkov 98521afaf18SBorislav Petkov if (!timeout) 98621afaf18SBorislav Petkov return -1; 98721afaf18SBorislav Petkov 98821afaf18SBorislav Petkov atomic_add(*no_way_out, &global_nwo); 98921afaf18SBorislav Petkov /* 99021afaf18SBorislav Petkov * Rely on the implied barrier below, such that global_nwo 99121afaf18SBorislav Petkov * is updated before mce_callin. 99221afaf18SBorislav Petkov */ 99321afaf18SBorislav Petkov order = atomic_inc_return(&mce_callin); 99421afaf18SBorislav Petkov 99521afaf18SBorislav Petkov /* 99621afaf18SBorislav Petkov * Wait for everyone. 99721afaf18SBorislav Petkov */ 99821afaf18SBorislav Petkov while (atomic_read(&mce_callin) != cpus) { 99921afaf18SBorislav Petkov if (mce_timed_out(&timeout, 100021afaf18SBorislav Petkov "Timeout: Not all CPUs entered broadcast exception handler")) { 100121afaf18SBorislav Petkov atomic_set(&global_nwo, 0); 100221afaf18SBorislav Petkov return -1; 100321afaf18SBorislav Petkov } 100421afaf18SBorislav Petkov ndelay(SPINUNIT); 100521afaf18SBorislav Petkov } 100621afaf18SBorislav Petkov 100721afaf18SBorislav Petkov /* 100821afaf18SBorislav Petkov * mce_callin should be read before global_nwo 100921afaf18SBorislav Petkov */ 101021afaf18SBorislav Petkov smp_rmb(); 101121afaf18SBorislav Petkov 101221afaf18SBorislav Petkov if (order == 1) { 101321afaf18SBorislav Petkov /* 101421afaf18SBorislav Petkov * Monarch: Starts executing now, the others wait. 101521afaf18SBorislav Petkov */ 101621afaf18SBorislav Petkov atomic_set(&mce_executing, 1); 101721afaf18SBorislav Petkov } else { 101821afaf18SBorislav Petkov /* 101921afaf18SBorislav Petkov * Subject: Now start the scanning loop one by one in 102021afaf18SBorislav Petkov * the original callin order. 102121afaf18SBorislav Petkov * This way when there are any shared banks it will be 102221afaf18SBorislav Petkov * only seen by one CPU before cleared, avoiding duplicates. 102321afaf18SBorislav Petkov */ 102421afaf18SBorislav Petkov while (atomic_read(&mce_executing) < order) { 102521afaf18SBorislav Petkov if (mce_timed_out(&timeout, 102621afaf18SBorislav Petkov "Timeout: Subject CPUs unable to finish machine check processing")) { 102721afaf18SBorislav Petkov atomic_set(&global_nwo, 0); 102821afaf18SBorislav Petkov return -1; 102921afaf18SBorislav Petkov } 103021afaf18SBorislav Petkov ndelay(SPINUNIT); 103121afaf18SBorislav Petkov } 103221afaf18SBorislav Petkov } 103321afaf18SBorislav Petkov 103421afaf18SBorislav Petkov /* 103521afaf18SBorislav Petkov * Cache the global no_way_out state. 103621afaf18SBorislav Petkov */ 103721afaf18SBorislav Petkov *no_way_out = atomic_read(&global_nwo); 103821afaf18SBorislav Petkov 103921afaf18SBorislav Petkov return order; 104021afaf18SBorislav Petkov } 104121afaf18SBorislav Petkov 104221afaf18SBorislav Petkov /* 104321afaf18SBorislav Petkov * Synchronize between CPUs after main scanning loop. 104421afaf18SBorislav Petkov * This invokes the bulk of the Monarch processing. 104521afaf18SBorislav Petkov */ 104621afaf18SBorislav Petkov static int mce_end(int order) 104721afaf18SBorislav Petkov { 104821afaf18SBorislav Petkov int ret = -1; 104921afaf18SBorislav Petkov u64 timeout = (u64)mca_cfg.monarch_timeout * NSEC_PER_USEC; 105021afaf18SBorislav Petkov 105121afaf18SBorislav Petkov if (!timeout) 105221afaf18SBorislav Petkov goto reset; 105321afaf18SBorislav Petkov if (order < 0) 105421afaf18SBorislav Petkov goto reset; 105521afaf18SBorislav Petkov 105621afaf18SBorislav Petkov /* 105721afaf18SBorislav Petkov * Allow others to run. 105821afaf18SBorislav Petkov */ 105921afaf18SBorislav Petkov atomic_inc(&mce_executing); 106021afaf18SBorislav Petkov 106121afaf18SBorislav Petkov if (order == 1) { 106221afaf18SBorislav Petkov /* CHECKME: Can this race with a parallel hotplug? */ 106321afaf18SBorislav Petkov int cpus = num_online_cpus(); 106421afaf18SBorislav Petkov 106521afaf18SBorislav Petkov /* 106621afaf18SBorislav Petkov * Monarch: Wait for everyone to go through their scanning 106721afaf18SBorislav Petkov * loops. 106821afaf18SBorislav Petkov */ 106921afaf18SBorislav Petkov while (atomic_read(&mce_executing) <= cpus) { 107021afaf18SBorislav Petkov if (mce_timed_out(&timeout, 107121afaf18SBorislav Petkov "Timeout: Monarch CPU unable to finish machine check processing")) 107221afaf18SBorislav Petkov goto reset; 107321afaf18SBorislav Petkov ndelay(SPINUNIT); 107421afaf18SBorislav Petkov } 107521afaf18SBorislav Petkov 107621afaf18SBorislav Petkov mce_reign(); 107721afaf18SBorislav Petkov barrier(); 107821afaf18SBorislav Petkov ret = 0; 107921afaf18SBorislav Petkov } else { 108021afaf18SBorislav Petkov /* 108121afaf18SBorislav Petkov * Subject: Wait for Monarch to finish. 108221afaf18SBorislav Petkov */ 108321afaf18SBorislav Petkov while (atomic_read(&mce_executing) != 0) { 108421afaf18SBorislav Petkov if (mce_timed_out(&timeout, 108521afaf18SBorislav Petkov "Timeout: Monarch CPU did not finish machine check processing")) 108621afaf18SBorislav Petkov goto reset; 108721afaf18SBorislav Petkov ndelay(SPINUNIT); 108821afaf18SBorislav Petkov } 108921afaf18SBorislav Petkov 109021afaf18SBorislav Petkov /* 109121afaf18SBorislav Petkov * Don't reset anything. That's done by the Monarch. 109221afaf18SBorislav Petkov */ 109321afaf18SBorislav Petkov return 0; 109421afaf18SBorislav Petkov } 109521afaf18SBorislav Petkov 109621afaf18SBorislav Petkov /* 109721afaf18SBorislav Petkov * Reset all global state. 109821afaf18SBorislav Petkov */ 109921afaf18SBorislav Petkov reset: 110021afaf18SBorislav Petkov atomic_set(&global_nwo, 0); 110121afaf18SBorislav Petkov atomic_set(&mce_callin, 0); 110221afaf18SBorislav Petkov barrier(); 110321afaf18SBorislav Petkov 110421afaf18SBorislav Petkov /* 110521afaf18SBorislav Petkov * Let others run again. 110621afaf18SBorislav Petkov */ 110721afaf18SBorislav Petkov atomic_set(&mce_executing, 0); 110821afaf18SBorislav Petkov return ret; 110921afaf18SBorislav Petkov } 111021afaf18SBorislav Petkov 111121afaf18SBorislav Petkov static void mce_clear_state(unsigned long *toclear) 111221afaf18SBorislav Petkov { 111321afaf18SBorislav Petkov int i; 111421afaf18SBorislav Petkov 1115c7d314f3SYazen Ghannam for (i = 0; i < this_cpu_read(mce_num_banks); i++) { 111621afaf18SBorislav Petkov if (test_bit(i, toclear)) 111721afaf18SBorislav Petkov mce_wrmsrl(msr_ops.status(i), 0); 111821afaf18SBorislav Petkov } 111921afaf18SBorislav Petkov } 112021afaf18SBorislav Petkov 112121afaf18SBorislav Petkov /* 112221afaf18SBorislav Petkov * Cases where we avoid rendezvous handler timeout: 112321afaf18SBorislav Petkov * 1) If this CPU is offline. 112421afaf18SBorislav Petkov * 112521afaf18SBorislav Petkov * 2) If crashing_cpu was set, e.g. we're entering kdump and we need to 112621afaf18SBorislav Petkov * skip those CPUs which remain looping in the 1st kernel - see 112721afaf18SBorislav Petkov * crash_nmi_callback(). 112821afaf18SBorislav Petkov * 112921afaf18SBorislav Petkov * Note: there still is a small window between kexec-ing and the new, 113021afaf18SBorislav Petkov * kdump kernel establishing a new #MC handler where a broadcasted MCE 113121afaf18SBorislav Petkov * might not get handled properly. 113221afaf18SBorislav Petkov */ 113394a46d31SThomas Gleixner static noinstr bool mce_check_crashing_cpu(void) 113421afaf18SBorislav Petkov { 113594a46d31SThomas Gleixner unsigned int cpu = smp_processor_id(); 113694a46d31SThomas Gleixner 113714d3b376SPeter Zijlstra if (arch_cpu_is_offline(cpu) || 113821afaf18SBorislav Petkov (crashing_cpu != -1 && crashing_cpu != cpu)) { 113921afaf18SBorislav Petkov u64 mcgstatus; 114021afaf18SBorislav Petkov 1141aedbdeabSThomas Gleixner mcgstatus = __rdmsr(MSR_IA32_MCG_STATUS); 114270f0c230STony W Wang-oc 114370f0c230STony W Wang-oc if (boot_cpu_data.x86_vendor == X86_VENDOR_ZHAOXIN) { 114470f0c230STony W Wang-oc if (mcgstatus & MCG_STATUS_LMCES) 114570f0c230STony W Wang-oc return false; 114670f0c230STony W Wang-oc } 114770f0c230STony W Wang-oc 114821afaf18SBorislav Petkov if (mcgstatus & MCG_STATUS_RIPV) { 1149aedbdeabSThomas Gleixner __wrmsr(MSR_IA32_MCG_STATUS, 0, 0); 115021afaf18SBorislav Petkov return true; 115121afaf18SBorislav Petkov } 115221afaf18SBorislav Petkov } 115321afaf18SBorislav Petkov return false; 115421afaf18SBorislav Petkov } 115521afaf18SBorislav Petkov 115621afaf18SBorislav Petkov static void __mc_scan_banks(struct mce *m, struct mce *final, 115721afaf18SBorislav Petkov unsigned long *toclear, unsigned long *valid_banks, 115821afaf18SBorislav Petkov int no_way_out, int *worst) 115921afaf18SBorislav Petkov { 1160b4914508SYazen Ghannam struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array); 116121afaf18SBorislav Petkov struct mca_config *cfg = &mca_cfg; 116221afaf18SBorislav Petkov int severity, i; 116321afaf18SBorislav Petkov 1164c7d314f3SYazen Ghannam for (i = 0; i < this_cpu_read(mce_num_banks); i++) { 116521afaf18SBorislav Petkov __clear_bit(i, toclear); 116621afaf18SBorislav Petkov if (!test_bit(i, valid_banks)) 116721afaf18SBorislav Petkov continue; 116821afaf18SBorislav Petkov 116921afaf18SBorislav Petkov if (!mce_banks[i].ctl) 117021afaf18SBorislav Petkov continue; 117121afaf18SBorislav Petkov 117221afaf18SBorislav Petkov m->misc = 0; 117321afaf18SBorislav Petkov m->addr = 0; 117421afaf18SBorislav Petkov m->bank = i; 117521afaf18SBorislav Petkov 117621afaf18SBorislav Petkov m->status = mce_rdmsrl(msr_ops.status(i)); 117721afaf18SBorislav Petkov if (!(m->status & MCI_STATUS_VAL)) 117821afaf18SBorislav Petkov continue; 117921afaf18SBorislav Petkov 118021afaf18SBorislav Petkov /* 118121afaf18SBorislav Petkov * Corrected or non-signaled errors are handled by 118221afaf18SBorislav Petkov * machine_check_poll(). Leave them alone, unless this panics. 118321afaf18SBorislav Petkov */ 118421afaf18SBorislav Petkov if (!(m->status & (cfg->ser ? MCI_STATUS_S : MCI_STATUS_UC)) && 118521afaf18SBorislav Petkov !no_way_out) 118621afaf18SBorislav Petkov continue; 118721afaf18SBorislav Petkov 118821afaf18SBorislav Petkov /* Set taint even when machine check was not enabled. */ 118921afaf18SBorislav Petkov add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); 119021afaf18SBorislav Petkov 119121afaf18SBorislav Petkov severity = mce_severity(m, cfg->tolerant, NULL, true); 119221afaf18SBorislav Petkov 119321afaf18SBorislav Petkov /* 119421afaf18SBorislav Petkov * When machine check was for corrected/deferred handler don't 119521afaf18SBorislav Petkov * touch, unless we're panicking. 119621afaf18SBorislav Petkov */ 119721afaf18SBorislav Petkov if ((severity == MCE_KEEP_SEVERITY || 119821afaf18SBorislav Petkov severity == MCE_UCNA_SEVERITY) && !no_way_out) 119921afaf18SBorislav Petkov continue; 120021afaf18SBorislav Petkov 120121afaf18SBorislav Petkov __set_bit(i, toclear); 120221afaf18SBorislav Petkov 120321afaf18SBorislav Petkov /* Machine check event was not enabled. Clear, but ignore. */ 120421afaf18SBorislav Petkov if (severity == MCE_NO_SEVERITY) 120521afaf18SBorislav Petkov continue; 120621afaf18SBorislav Petkov 120721afaf18SBorislav Petkov mce_read_aux(m, i); 120821afaf18SBorislav Petkov 120921afaf18SBorislav Petkov /* assuming valid severity level != 0 */ 121021afaf18SBorislav Petkov m->severity = severity; 121121afaf18SBorislav Petkov 121221afaf18SBorislav Petkov mce_log(m); 121321afaf18SBorislav Petkov 121421afaf18SBorislav Petkov if (severity > *worst) { 121521afaf18SBorislav Petkov *final = *m; 121621afaf18SBorislav Petkov *worst = severity; 121721afaf18SBorislav Petkov } 121821afaf18SBorislav Petkov } 121921afaf18SBorislav Petkov 122021afaf18SBorislav Petkov /* mce_clear_state will clear *final, save locally for use later */ 122121afaf18SBorislav Petkov *m = *final; 122221afaf18SBorislav Petkov } 122321afaf18SBorislav Petkov 12245567d11cSPeter Zijlstra static void kill_me_now(struct callback_head *ch) 12255567d11cSPeter Zijlstra { 12265567d11cSPeter Zijlstra force_sig(SIGBUS); 12275567d11cSPeter Zijlstra } 12285567d11cSPeter Zijlstra 12295567d11cSPeter Zijlstra static void kill_me_maybe(struct callback_head *cb) 12305567d11cSPeter Zijlstra { 12315567d11cSPeter Zijlstra struct task_struct *p = container_of(cb, struct task_struct, mce_kill_me); 12325567d11cSPeter Zijlstra int flags = MF_ACTION_REQUIRED; 12335567d11cSPeter Zijlstra 12345567d11cSPeter Zijlstra pr_err("Uncorrected hardware memory error in user-access at %llx", p->mce_addr); 123517fae129STony Luck 123617fae129STony Luck if (!p->mce_ripv) 12375567d11cSPeter Zijlstra flags |= MF_MUST_KILL; 12385567d11cSPeter Zijlstra 12395567d11cSPeter Zijlstra if (!memory_failure(p->mce_addr >> PAGE_SHIFT, flags)) { 124017fae129STony Luck set_mce_nospec(p->mce_addr >> PAGE_SHIFT, p->mce_whole_page); 12411e36d9c6STony Luck sync_core(); 12425567d11cSPeter Zijlstra return; 12435567d11cSPeter Zijlstra } 12445567d11cSPeter Zijlstra 12455567d11cSPeter Zijlstra pr_err("Memory error not recovered"); 12465567d11cSPeter Zijlstra kill_me_now(cb); 12475567d11cSPeter Zijlstra } 12485567d11cSPeter Zijlstra 124921afaf18SBorislav Petkov /* 125021afaf18SBorislav Petkov * The actual machine check handler. This only handles real 125121afaf18SBorislav Petkov * exceptions when something got corrupted coming in through int 18. 125221afaf18SBorislav Petkov * 125321afaf18SBorislav Petkov * This is executed in NMI context not subject to normal locking rules. This 125421afaf18SBorislav Petkov * implies that most kernel services cannot be safely used. Don't even 125521afaf18SBorislav Petkov * think about putting a printk in there! 125621afaf18SBorislav Petkov * 125721afaf18SBorislav Petkov * On Intel systems this is entered on all CPUs in parallel through 125821afaf18SBorislav Petkov * MCE broadcast. However some CPUs might be broken beyond repair, 125921afaf18SBorislav Petkov * so be always careful when synchronizing with others. 126055ba18d6SAndy Lutomirski * 126155ba18d6SAndy Lutomirski * Tracing and kprobes are disabled: if we interrupted a kernel context 126255ba18d6SAndy Lutomirski * with IF=1, we need to minimize stack usage. There are also recursion 126355ba18d6SAndy Lutomirski * issues: if the machine check was due to a failure of the memory 126455ba18d6SAndy Lutomirski * backing the user stack, tracing that reads the user stack will cause 126555ba18d6SAndy Lutomirski * potentially infinite recursion. 126621afaf18SBorislav Petkov */ 12677f6fa101SIra Weiny noinstr void do_machine_check(struct pt_regs *regs) 126821afaf18SBorislav Petkov { 126921afaf18SBorislav Petkov DECLARE_BITMAP(valid_banks, MAX_NR_BANKS); 127021afaf18SBorislav Petkov DECLARE_BITMAP(toclear, MAX_NR_BANKS); 127121afaf18SBorislav Petkov struct mca_config *cfg = &mca_cfg; 127221afaf18SBorislav Petkov struct mce m, *final; 12737a8bc2b0SJan H. Schönherr char *msg = NULL; 127421afaf18SBorislav Petkov int worst = 0; 127521afaf18SBorislav Petkov 127621afaf18SBorislav Petkov /* 127721afaf18SBorislav Petkov * Establish sequential order between the CPUs entering the machine 127821afaf18SBorislav Petkov * check handler. 127921afaf18SBorislav Petkov */ 128021afaf18SBorislav Petkov int order = -1; 128121afaf18SBorislav Petkov 128221afaf18SBorislav Petkov /* 128321afaf18SBorislav Petkov * If no_way_out gets set, there is no safe way to recover from this 128421afaf18SBorislav Petkov * MCE. If mca_cfg.tolerant is cranked up, we'll try anyway. 128521afaf18SBorislav Petkov */ 128621afaf18SBorislav Petkov int no_way_out = 0; 128721afaf18SBorislav Petkov 128821afaf18SBorislav Petkov /* 128921afaf18SBorislav Petkov * If kill_it gets set, there might be a way to recover from this 129021afaf18SBorislav Petkov * error. 129121afaf18SBorislav Petkov */ 129221afaf18SBorislav Petkov int kill_it = 0; 129321afaf18SBorislav Petkov 129421afaf18SBorislav Petkov /* 129521afaf18SBorislav Petkov * MCEs are always local on AMD. Same is determined by MCG_STATUS_LMCES 129621afaf18SBorislav Petkov * on Intel. 129721afaf18SBorislav Petkov */ 129821afaf18SBorislav Petkov int lmce = 1; 129921afaf18SBorislav Petkov 130021afaf18SBorislav Petkov this_cpu_inc(mce_exception_count); 130121afaf18SBorislav Petkov 130221afaf18SBorislav Petkov mce_gather_info(&m, regs); 130321afaf18SBorislav Petkov m.tsc = rdtsc(); 130421afaf18SBorislav Petkov 130521afaf18SBorislav Petkov final = this_cpu_ptr(&mces_seen); 130621afaf18SBorislav Petkov *final = m; 130721afaf18SBorislav Petkov 130821afaf18SBorislav Petkov memset(valid_banks, 0, sizeof(valid_banks)); 130921afaf18SBorislav Petkov no_way_out = mce_no_way_out(&m, &msg, valid_banks, regs); 131021afaf18SBorislav Petkov 131121afaf18SBorislav Petkov barrier(); 131221afaf18SBorislav Petkov 131321afaf18SBorislav Petkov /* 131421afaf18SBorislav Petkov * When no restart IP might need to kill or panic. 131521afaf18SBorislav Petkov * Assume the worst for now, but if we find the 131621afaf18SBorislav Petkov * severity is MCE_AR_SEVERITY we have other options. 131721afaf18SBorislav Petkov */ 131821afaf18SBorislav Petkov if (!(m.mcgstatus & MCG_STATUS_RIPV)) 131921afaf18SBorislav Petkov kill_it = 1; 132021afaf18SBorislav Petkov 132121afaf18SBorislav Petkov /* 132221afaf18SBorislav Petkov * Check if this MCE is signaled to only this logical processor, 132370f0c230STony W Wang-oc * on Intel, Zhaoxin only. 132421afaf18SBorislav Petkov */ 132570f0c230STony W Wang-oc if (m.cpuvendor == X86_VENDOR_INTEL || 132670f0c230STony W Wang-oc m.cpuvendor == X86_VENDOR_ZHAOXIN) 132721afaf18SBorislav Petkov lmce = m.mcgstatus & MCG_STATUS_LMCES; 132821afaf18SBorislav Petkov 132921afaf18SBorislav Petkov /* 133021afaf18SBorislav Petkov * Local machine check may already know that we have to panic. 133121afaf18SBorislav Petkov * Broadcast machine check begins rendezvous in mce_start() 133221afaf18SBorislav Petkov * Go through all banks in exclusion of the other CPUs. This way we 133321afaf18SBorislav Petkov * don't report duplicated events on shared banks because the first one 133421afaf18SBorislav Petkov * to see it will clear it. 133521afaf18SBorislav Petkov */ 133621afaf18SBorislav Petkov if (lmce) { 133721afaf18SBorislav Petkov if (no_way_out) 133821afaf18SBorislav Petkov mce_panic("Fatal local machine check", &m, msg); 133921afaf18SBorislav Petkov } else { 134021afaf18SBorislav Petkov order = mce_start(&no_way_out); 134121afaf18SBorislav Petkov } 134221afaf18SBorislav Petkov 134321afaf18SBorislav Petkov __mc_scan_banks(&m, final, toclear, valid_banks, no_way_out, &worst); 134421afaf18SBorislav Petkov 134521afaf18SBorislav Petkov if (!no_way_out) 134621afaf18SBorislav Petkov mce_clear_state(toclear); 134721afaf18SBorislav Petkov 134821afaf18SBorislav Petkov /* 134921afaf18SBorislav Petkov * Do most of the synchronization with other CPUs. 135021afaf18SBorislav Petkov * When there's any problem use only local no_way_out state. 135121afaf18SBorislav Petkov */ 135221afaf18SBorislav Petkov if (!lmce) { 135321afaf18SBorislav Petkov if (mce_end(order) < 0) 135421afaf18SBorislav Petkov no_way_out = worst >= MCE_PANIC_SEVERITY; 135521afaf18SBorislav Petkov } else { 135621afaf18SBorislav Petkov /* 135721afaf18SBorislav Petkov * If there was a fatal machine check we should have 135821afaf18SBorislav Petkov * already called mce_panic earlier in this function. 135921afaf18SBorislav Petkov * Since we re-read the banks, we might have found 136021afaf18SBorislav Petkov * something new. Check again to see if we found a 136121afaf18SBorislav Petkov * fatal error. We call "mce_severity()" again to 136221afaf18SBorislav Petkov * make sure we have the right "msg". 136321afaf18SBorislav Petkov */ 136421afaf18SBorislav Petkov if (worst >= MCE_PANIC_SEVERITY && mca_cfg.tolerant < 3) { 136521afaf18SBorislav Petkov mce_severity(&m, cfg->tolerant, &msg, true); 136621afaf18SBorislav Petkov mce_panic("Local fatal machine check!", &m, msg); 136721afaf18SBorislav Petkov } 136821afaf18SBorislav Petkov } 136921afaf18SBorislav Petkov 137021afaf18SBorislav Petkov /* 137121afaf18SBorislav Petkov * If tolerant is at an insane level we drop requests to kill 137221afaf18SBorislav Petkov * processes and continue even when there is no way out. 137321afaf18SBorislav Petkov */ 137421afaf18SBorislav Petkov if (cfg->tolerant == 3) 137521afaf18SBorislav Petkov kill_it = 0; 137621afaf18SBorislav Petkov else if (no_way_out) 137721afaf18SBorislav Petkov mce_panic("Fatal machine check on current CPU", &m, msg); 137821afaf18SBorislav Petkov 137921afaf18SBorislav Petkov if (worst > 0) 138039f0584eSBorislav Petkov irq_work_queue(&mce_irq_work); 138139f0584eSBorislav Petkov 138221afaf18SBorislav Petkov if (worst != MCE_AR_SEVERITY && !kill_it) 13831e36d9c6STony Luck goto out; 138421afaf18SBorislav Petkov 138521afaf18SBorislav Petkov /* Fault was in user mode and we need to take some action */ 138621afaf18SBorislav Petkov if ((m.cs & 3) == 3) { 1387b052df3dSThomas Gleixner /* If this triggers there is no way to recover. Die hard. */ 1388b052df3dSThomas Gleixner BUG_ON(!on_thread_stack() || !user_mode(regs)); 138921afaf18SBorislav Petkov 13905567d11cSPeter Zijlstra current->mce_addr = m.addr; 139117fae129STony Luck current->mce_ripv = !!(m.mcgstatus & MCG_STATUS_RIPV); 139217fae129STony Luck current->mce_whole_page = whole_page(&m); 13935567d11cSPeter Zijlstra current->mce_kill_me.func = kill_me_maybe; 13945567d11cSPeter Zijlstra if (kill_it) 13955567d11cSPeter Zijlstra current->mce_kill_me.func = kill_me_now; 13965567d11cSPeter Zijlstra task_work_add(current, ¤t->mce_kill_me, true); 139721afaf18SBorislav Petkov } else { 13981df73b21SBorislav Petkov /* 13991df73b21SBorislav Petkov * Handle an MCE which has happened in kernel space but from 14001df73b21SBorislav Petkov * which the kernel can recover: ex_has_fault_handler() has 14011df73b21SBorislav Petkov * already verified that the rIP at which the error happened is 14021df73b21SBorislav Petkov * a rIP from which the kernel can recover (by jumping to 14031df73b21SBorislav Petkov * recovery code specified in _ASM_EXTABLE_FAULT()) and the 14041df73b21SBorislav Petkov * corresponding exception handler which would do that is the 14051df73b21SBorislav Petkov * proper one. 14061df73b21SBorislav Petkov */ 14071df73b21SBorislav Petkov if (m.kflags & MCE_IN_KERNEL_RECOV) { 14088cd501c1SThomas Gleixner if (!fixup_exception(regs, X86_TRAP_MC, 0, 0)) 14092d806d07SJan H. Schönherr mce_panic("Failed kernel mode recovery", &m, msg); 141021afaf18SBorislav Petkov } 14111df73b21SBorislav Petkov } 14121e36d9c6STony Luck out: 14131e36d9c6STony Luck mce_wrmsrl(MSR_IA32_MCG_STATUS, 0); 141421afaf18SBorislav Petkov } 141521afaf18SBorislav Petkov EXPORT_SYMBOL_GPL(do_machine_check); 141621afaf18SBorislav Petkov 141721afaf18SBorislav Petkov #ifndef CONFIG_MEMORY_FAILURE 141821afaf18SBorislav Petkov int memory_failure(unsigned long pfn, int flags) 141921afaf18SBorislav Petkov { 142021afaf18SBorislav Petkov /* mce_severity() should not hand us an ACTION_REQUIRED error */ 142121afaf18SBorislav Petkov BUG_ON(flags & MF_ACTION_REQUIRED); 142221afaf18SBorislav Petkov pr_err("Uncorrected memory error in page 0x%lx ignored\n" 142321afaf18SBorislav Petkov "Rebuild kernel with CONFIG_MEMORY_FAILURE=y for smarter handling\n", 142421afaf18SBorislav Petkov pfn); 142521afaf18SBorislav Petkov 142621afaf18SBorislav Petkov return 0; 142721afaf18SBorislav Petkov } 142821afaf18SBorislav Petkov #endif 142921afaf18SBorislav Petkov 143021afaf18SBorislav Petkov /* 143121afaf18SBorislav Petkov * Periodic polling timer for "silent" machine check errors. If the 143221afaf18SBorislav Petkov * poller finds an MCE, poll 2x faster. When the poller finds no more 143321afaf18SBorislav Petkov * errors, poll 2x slower (up to check_interval seconds). 143421afaf18SBorislav Petkov */ 143521afaf18SBorislav Petkov static unsigned long check_interval = INITIAL_CHECK_INTERVAL; 143621afaf18SBorislav Petkov 143721afaf18SBorislav Petkov static DEFINE_PER_CPU(unsigned long, mce_next_interval); /* in jiffies */ 143821afaf18SBorislav Petkov static DEFINE_PER_CPU(struct timer_list, mce_timer); 143921afaf18SBorislav Petkov 144021afaf18SBorislav Petkov static unsigned long mce_adjust_timer_default(unsigned long interval) 144121afaf18SBorislav Petkov { 144221afaf18SBorislav Petkov return interval; 144321afaf18SBorislav Petkov } 144421afaf18SBorislav Petkov 144521afaf18SBorislav Petkov static unsigned long (*mce_adjust_timer)(unsigned long interval) = mce_adjust_timer_default; 144621afaf18SBorislav Petkov 144721afaf18SBorislav Petkov static void __start_timer(struct timer_list *t, unsigned long interval) 144821afaf18SBorislav Petkov { 144921afaf18SBorislav Petkov unsigned long when = jiffies + interval; 145021afaf18SBorislav Petkov unsigned long flags; 145121afaf18SBorislav Petkov 145221afaf18SBorislav Petkov local_irq_save(flags); 145321afaf18SBorislav Petkov 145421afaf18SBorislav Petkov if (!timer_pending(t) || time_before(when, t->expires)) 145521afaf18SBorislav Petkov mod_timer(t, round_jiffies(when)); 145621afaf18SBorislav Petkov 145721afaf18SBorislav Petkov local_irq_restore(flags); 145821afaf18SBorislav Petkov } 145921afaf18SBorislav Petkov 146021afaf18SBorislav Petkov static void mce_timer_fn(struct timer_list *t) 146121afaf18SBorislav Petkov { 146221afaf18SBorislav Petkov struct timer_list *cpu_t = this_cpu_ptr(&mce_timer); 146321afaf18SBorislav Petkov unsigned long iv; 146421afaf18SBorislav Petkov 146521afaf18SBorislav Petkov WARN_ON(cpu_t != t); 146621afaf18SBorislav Petkov 146721afaf18SBorislav Petkov iv = __this_cpu_read(mce_next_interval); 146821afaf18SBorislav Petkov 146921afaf18SBorislav Petkov if (mce_available(this_cpu_ptr(&cpu_info))) { 147021afaf18SBorislav Petkov machine_check_poll(0, this_cpu_ptr(&mce_poll_banks)); 147121afaf18SBorislav Petkov 147221afaf18SBorislav Petkov if (mce_intel_cmci_poll()) { 147321afaf18SBorislav Petkov iv = mce_adjust_timer(iv); 147421afaf18SBorislav Petkov goto done; 147521afaf18SBorislav Petkov } 147621afaf18SBorislav Petkov } 147721afaf18SBorislav Petkov 147821afaf18SBorislav Petkov /* 147921afaf18SBorislav Petkov * Alert userspace if needed. If we logged an MCE, reduce the polling 148021afaf18SBorislav Petkov * interval, otherwise increase the polling interval. 148121afaf18SBorislav Petkov */ 148221afaf18SBorislav Petkov if (mce_notify_irq()) 148321afaf18SBorislav Petkov iv = max(iv / 2, (unsigned long) HZ/100); 148421afaf18SBorislav Petkov else 148521afaf18SBorislav Petkov iv = min(iv * 2, round_jiffies_relative(check_interval * HZ)); 148621afaf18SBorislav Petkov 148721afaf18SBorislav Petkov done: 148821afaf18SBorislav Petkov __this_cpu_write(mce_next_interval, iv); 148921afaf18SBorislav Petkov __start_timer(t, iv); 149021afaf18SBorislav Petkov } 149121afaf18SBorislav Petkov 149221afaf18SBorislav Petkov /* 149321afaf18SBorislav Petkov * Ensure that the timer is firing in @interval from now. 149421afaf18SBorislav Petkov */ 149521afaf18SBorislav Petkov void mce_timer_kick(unsigned long interval) 149621afaf18SBorislav Petkov { 149721afaf18SBorislav Petkov struct timer_list *t = this_cpu_ptr(&mce_timer); 149821afaf18SBorislav Petkov unsigned long iv = __this_cpu_read(mce_next_interval); 149921afaf18SBorislav Petkov 150021afaf18SBorislav Petkov __start_timer(t, interval); 150121afaf18SBorislav Petkov 150221afaf18SBorislav Petkov if (interval < iv) 150321afaf18SBorislav Petkov __this_cpu_write(mce_next_interval, interval); 150421afaf18SBorislav Petkov } 150521afaf18SBorislav Petkov 150621afaf18SBorislav Petkov /* Must not be called in IRQ context where del_timer_sync() can deadlock */ 150721afaf18SBorislav Petkov static void mce_timer_delete_all(void) 150821afaf18SBorislav Petkov { 150921afaf18SBorislav Petkov int cpu; 151021afaf18SBorislav Petkov 151121afaf18SBorislav Petkov for_each_online_cpu(cpu) 151221afaf18SBorislav Petkov del_timer_sync(&per_cpu(mce_timer, cpu)); 151321afaf18SBorislav Petkov } 151421afaf18SBorislav Petkov 151521afaf18SBorislav Petkov /* 151621afaf18SBorislav Petkov * Notify the user(s) about new machine check events. 151721afaf18SBorislav Petkov * Can be called from interrupt context, but not from machine check/NMI 151821afaf18SBorislav Petkov * context. 151921afaf18SBorislav Petkov */ 152021afaf18SBorislav Petkov int mce_notify_irq(void) 152121afaf18SBorislav Petkov { 152221afaf18SBorislav Petkov /* Not more than two messages every minute */ 152321afaf18SBorislav Petkov static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2); 152421afaf18SBorislav Petkov 152521afaf18SBorislav Petkov if (test_and_clear_bit(0, &mce_need_notify)) { 152621afaf18SBorislav Petkov mce_work_trigger(); 152721afaf18SBorislav Petkov 152821afaf18SBorislav Petkov if (__ratelimit(&ratelimit)) 152921afaf18SBorislav Petkov pr_info(HW_ERR "Machine check events logged\n"); 153021afaf18SBorislav Petkov 153121afaf18SBorislav Petkov return 1; 153221afaf18SBorislav Petkov } 153321afaf18SBorislav Petkov return 0; 153421afaf18SBorislav Petkov } 153521afaf18SBorislav Petkov EXPORT_SYMBOL_GPL(mce_notify_irq); 153621afaf18SBorislav Petkov 1537b4914508SYazen Ghannam static void __mcheck_cpu_mce_banks_init(void) 153821afaf18SBorislav Petkov { 1539b4914508SYazen Ghannam struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array); 1540c7d314f3SYazen Ghannam u8 n_banks = this_cpu_read(mce_num_banks); 154121afaf18SBorislav Petkov int i; 154221afaf18SBorislav Petkov 1543c7d314f3SYazen Ghannam for (i = 0; i < n_banks; i++) { 154421afaf18SBorislav Petkov struct mce_bank *b = &mce_banks[i]; 154521afaf18SBorislav Petkov 1546068b053dSYazen Ghannam /* 1547068b053dSYazen Ghannam * Init them all, __mcheck_cpu_apply_quirks() is going to apply 1548068b053dSYazen Ghannam * the required vendor quirks before 1549068b053dSYazen Ghannam * __mcheck_cpu_init_clear_banks() does the final bank setup. 1550068b053dSYazen Ghannam */ 155121afaf18SBorislav Petkov b->ctl = -1ULL; 155221afaf18SBorislav Petkov b->init = 1; 155321afaf18SBorislav Petkov } 155421afaf18SBorislav Petkov } 155521afaf18SBorislav Petkov 155621afaf18SBorislav Petkov /* 155721afaf18SBorislav Petkov * Initialize Machine Checks for a CPU. 155821afaf18SBorislav Petkov */ 1559b4914508SYazen Ghannam static void __mcheck_cpu_cap_init(void) 156021afaf18SBorislav Petkov { 156121afaf18SBorislav Petkov u64 cap; 1562006c0770SYazen Ghannam u8 b; 156321afaf18SBorislav Petkov 156421afaf18SBorislav Petkov rdmsrl(MSR_IA32_MCG_CAP, cap); 156521afaf18SBorislav Petkov 156621afaf18SBorislav Petkov b = cap & MCG_BANKCNT_MASK; 156721afaf18SBorislav Petkov 1568c7d314f3SYazen Ghannam if (b > MAX_NR_BANKS) { 1569c7d314f3SYazen Ghannam pr_warn("CPU%d: Using only %u machine check banks out of %u\n", 1570c7d314f3SYazen Ghannam smp_processor_id(), MAX_NR_BANKS, b); 1571c7d314f3SYazen Ghannam b = MAX_NR_BANKS; 1572c7d314f3SYazen Ghannam } 1573c7d314f3SYazen Ghannam 1574c7d314f3SYazen Ghannam this_cpu_write(mce_num_banks, b); 157521afaf18SBorislav Petkov 1576b4914508SYazen Ghannam __mcheck_cpu_mce_banks_init(); 157721afaf18SBorislav Petkov 157821afaf18SBorislav Petkov /* Use accurate RIP reporting if available. */ 157921afaf18SBorislav Petkov if ((cap & MCG_EXT_P) && MCG_EXT_CNT(cap) >= 9) 158021afaf18SBorislav Petkov mca_cfg.rip_msr = MSR_IA32_MCG_EIP; 158121afaf18SBorislav Petkov 158221afaf18SBorislav Petkov if (cap & MCG_SER_P) 158321afaf18SBorislav Petkov mca_cfg.ser = 1; 158421afaf18SBorislav Petkov } 158521afaf18SBorislav Petkov 158621afaf18SBorislav Petkov static void __mcheck_cpu_init_generic(void) 158721afaf18SBorislav Petkov { 158821afaf18SBorislav Petkov enum mcp_flags m_fl = 0; 158921afaf18SBorislav Petkov mce_banks_t all_banks; 159021afaf18SBorislav Petkov u64 cap; 159121afaf18SBorislav Petkov 159221afaf18SBorislav Petkov if (!mca_cfg.bootlog) 159321afaf18SBorislav Petkov m_fl = MCP_DONTLOG; 159421afaf18SBorislav Petkov 159521afaf18SBorislav Petkov /* 159621afaf18SBorislav Petkov * Log the machine checks left over from the previous reset. 159721afaf18SBorislav Petkov */ 159821afaf18SBorislav Petkov bitmap_fill(all_banks, MAX_NR_BANKS); 159921afaf18SBorislav Petkov machine_check_poll(MCP_UC | m_fl, &all_banks); 160021afaf18SBorislav Petkov 160121afaf18SBorislav Petkov cr4_set_bits(X86_CR4_MCE); 160221afaf18SBorislav Petkov 160321afaf18SBorislav Petkov rdmsrl(MSR_IA32_MCG_CAP, cap); 160421afaf18SBorislav Petkov if (cap & MCG_CTL_P) 160521afaf18SBorislav Petkov wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff); 160621afaf18SBorislav Petkov } 160721afaf18SBorislav Petkov 160821afaf18SBorislav Petkov static void __mcheck_cpu_init_clear_banks(void) 160921afaf18SBorislav Petkov { 1610b4914508SYazen Ghannam struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array); 161121afaf18SBorislav Petkov int i; 161221afaf18SBorislav Petkov 1613c7d314f3SYazen Ghannam for (i = 0; i < this_cpu_read(mce_num_banks); i++) { 161421afaf18SBorislav Petkov struct mce_bank *b = &mce_banks[i]; 161521afaf18SBorislav Petkov 161621afaf18SBorislav Petkov if (!b->init) 161721afaf18SBorislav Petkov continue; 161821afaf18SBorislav Petkov wrmsrl(msr_ops.ctl(i), b->ctl); 161921afaf18SBorislav Petkov wrmsrl(msr_ops.status(i), 0); 162021afaf18SBorislav Petkov } 162121afaf18SBorislav Petkov } 162221afaf18SBorislav Petkov 162321afaf18SBorislav Petkov /* 1624068b053dSYazen Ghannam * Do a final check to see if there are any unused/RAZ banks. 1625068b053dSYazen Ghannam * 1626068b053dSYazen Ghannam * This must be done after the banks have been initialized and any quirks have 1627068b053dSYazen Ghannam * been applied. 1628068b053dSYazen Ghannam * 1629068b053dSYazen Ghannam * Do not call this from any user-initiated flows, e.g. CPU hotplug or sysfs. 1630068b053dSYazen Ghannam * Otherwise, a user who disables a bank will not be able to re-enable it 1631068b053dSYazen Ghannam * without a system reboot. 1632068b053dSYazen Ghannam */ 1633068b053dSYazen Ghannam static void __mcheck_cpu_check_banks(void) 1634068b053dSYazen Ghannam { 1635068b053dSYazen Ghannam struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array); 1636068b053dSYazen Ghannam u64 msrval; 1637068b053dSYazen Ghannam int i; 1638068b053dSYazen Ghannam 1639068b053dSYazen Ghannam for (i = 0; i < this_cpu_read(mce_num_banks); i++) { 1640068b053dSYazen Ghannam struct mce_bank *b = &mce_banks[i]; 1641068b053dSYazen Ghannam 1642068b053dSYazen Ghannam if (!b->init) 1643068b053dSYazen Ghannam continue; 1644068b053dSYazen Ghannam 1645068b053dSYazen Ghannam rdmsrl(msr_ops.ctl(i), msrval); 1646068b053dSYazen Ghannam b->init = !!msrval; 1647068b053dSYazen Ghannam } 1648068b053dSYazen Ghannam } 1649068b053dSYazen Ghannam 1650068b053dSYazen Ghannam /* 165121afaf18SBorislav Petkov * During IFU recovery Sandy Bridge -EP4S processors set the RIPV and 165221afaf18SBorislav Petkov * EIPV bits in MCG_STATUS to zero on the affected logical processor (SDM 165321afaf18SBorislav Petkov * Vol 3B Table 15-20). But this confuses both the code that determines 165421afaf18SBorislav Petkov * whether the machine check occurred in kernel or user mode, and also 165521afaf18SBorislav Petkov * the severity assessment code. Pretend that EIPV was set, and take the 165621afaf18SBorislav Petkov * ip/cs values from the pt_regs that mce_gather_info() ignored earlier. 165721afaf18SBorislav Petkov */ 165821afaf18SBorislav Petkov static void quirk_sandybridge_ifu(int bank, struct mce *m, struct pt_regs *regs) 165921afaf18SBorislav Petkov { 166021afaf18SBorislav Petkov if (bank != 0) 166121afaf18SBorislav Petkov return; 166221afaf18SBorislav Petkov if ((m->mcgstatus & (MCG_STATUS_EIPV|MCG_STATUS_RIPV)) != 0) 166321afaf18SBorislav Petkov return; 166421afaf18SBorislav Petkov if ((m->status & (MCI_STATUS_OVER|MCI_STATUS_UC| 166521afaf18SBorislav Petkov MCI_STATUS_EN|MCI_STATUS_MISCV|MCI_STATUS_ADDRV| 166621afaf18SBorislav Petkov MCI_STATUS_PCC|MCI_STATUS_S|MCI_STATUS_AR| 166721afaf18SBorislav Petkov MCACOD)) != 166821afaf18SBorislav Petkov (MCI_STATUS_UC|MCI_STATUS_EN| 166921afaf18SBorislav Petkov MCI_STATUS_MISCV|MCI_STATUS_ADDRV|MCI_STATUS_S| 167021afaf18SBorislav Petkov MCI_STATUS_AR|MCACOD_INSTR)) 167121afaf18SBorislav Petkov return; 167221afaf18SBorislav Petkov 167321afaf18SBorislav Petkov m->mcgstatus |= MCG_STATUS_EIPV; 167421afaf18SBorislav Petkov m->ip = regs->ip; 167521afaf18SBorislav Petkov m->cs = regs->cs; 167621afaf18SBorislav Petkov } 167721afaf18SBorislav Petkov 167821afaf18SBorislav Petkov /* Add per CPU specific workarounds here */ 167921afaf18SBorislav Petkov static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c) 168021afaf18SBorislav Petkov { 1681b4914508SYazen Ghannam struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array); 168221afaf18SBorislav Petkov struct mca_config *cfg = &mca_cfg; 168321afaf18SBorislav Petkov 168421afaf18SBorislav Petkov if (c->x86_vendor == X86_VENDOR_UNKNOWN) { 168521afaf18SBorislav Petkov pr_info("unknown CPU type - not enabling MCE support\n"); 168621afaf18SBorislav Petkov return -EOPNOTSUPP; 168721afaf18SBorislav Petkov } 168821afaf18SBorislav Petkov 168921afaf18SBorislav Petkov /* This should be disabled by the BIOS, but isn't always */ 169021afaf18SBorislav Petkov if (c->x86_vendor == X86_VENDOR_AMD) { 1691c7d314f3SYazen Ghannam if (c->x86 == 15 && this_cpu_read(mce_num_banks) > 4) { 169221afaf18SBorislav Petkov /* 169321afaf18SBorislav Petkov * disable GART TBL walk error reporting, which 169421afaf18SBorislav Petkov * trips off incorrectly with the IOMMU & 3ware 169521afaf18SBorislav Petkov * & Cerberus: 169621afaf18SBorislav Petkov */ 169721afaf18SBorislav Petkov clear_bit(10, (unsigned long *)&mce_banks[4].ctl); 169821afaf18SBorislav Petkov } 169921afaf18SBorislav Petkov if (c->x86 < 0x11 && cfg->bootlog < 0) { 170021afaf18SBorislav Petkov /* 170121afaf18SBorislav Petkov * Lots of broken BIOS around that don't clear them 170221afaf18SBorislav Petkov * by default and leave crap in there. Don't log: 170321afaf18SBorislav Petkov */ 170421afaf18SBorislav Petkov cfg->bootlog = 0; 170521afaf18SBorislav Petkov } 170621afaf18SBorislav Petkov /* 170721afaf18SBorislav Petkov * Various K7s with broken bank 0 around. Always disable 170821afaf18SBorislav Petkov * by default. 170921afaf18SBorislav Petkov */ 1710c7d314f3SYazen Ghannam if (c->x86 == 6 && this_cpu_read(mce_num_banks) > 0) 171121afaf18SBorislav Petkov mce_banks[0].ctl = 0; 171221afaf18SBorislav Petkov 171321afaf18SBorislav Petkov /* 171421afaf18SBorislav Petkov * overflow_recov is supported for F15h Models 00h-0fh 171521afaf18SBorislav Petkov * even though we don't have a CPUID bit for it. 171621afaf18SBorislav Petkov */ 171721afaf18SBorislav Petkov if (c->x86 == 0x15 && c->x86_model <= 0xf) 171821afaf18SBorislav Petkov mce_flags.overflow_recov = 1; 171921afaf18SBorislav Petkov 172021afaf18SBorislav Petkov } 172121afaf18SBorislav Petkov 172221afaf18SBorislav Petkov if (c->x86_vendor == X86_VENDOR_INTEL) { 172321afaf18SBorislav Petkov /* 172421afaf18SBorislav Petkov * SDM documents that on family 6 bank 0 should not be written 172521afaf18SBorislav Petkov * because it aliases to another special BIOS controlled 172621afaf18SBorislav Petkov * register. 172721afaf18SBorislav Petkov * But it's not aliased anymore on model 0x1a+ 172821afaf18SBorislav Petkov * Don't ignore bank 0 completely because there could be a 172921afaf18SBorislav Petkov * valid event later, merely don't write CTL0. 173021afaf18SBorislav Petkov */ 173121afaf18SBorislav Petkov 1732c7d314f3SYazen Ghannam if (c->x86 == 6 && c->x86_model < 0x1A && this_cpu_read(mce_num_banks) > 0) 173321afaf18SBorislav Petkov mce_banks[0].init = 0; 173421afaf18SBorislav Petkov 173521afaf18SBorislav Petkov /* 173621afaf18SBorislav Petkov * All newer Intel systems support MCE broadcasting. Enable 173721afaf18SBorislav Petkov * synchronization with a one second timeout. 173821afaf18SBorislav Petkov */ 173921afaf18SBorislav Petkov if ((c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xe)) && 174021afaf18SBorislav Petkov cfg->monarch_timeout < 0) 174121afaf18SBorislav Petkov cfg->monarch_timeout = USEC_PER_SEC; 174221afaf18SBorislav Petkov 174321afaf18SBorislav Petkov /* 174421afaf18SBorislav Petkov * There are also broken BIOSes on some Pentium M and 174521afaf18SBorislav Petkov * earlier systems: 174621afaf18SBorislav Petkov */ 174721afaf18SBorislav Petkov if (c->x86 == 6 && c->x86_model <= 13 && cfg->bootlog < 0) 174821afaf18SBorislav Petkov cfg->bootlog = 0; 174921afaf18SBorislav Petkov 175021afaf18SBorislav Petkov if (c->x86 == 6 && c->x86_model == 45) 175121afaf18SBorislav Petkov quirk_no_way_out = quirk_sandybridge_ifu; 175221afaf18SBorislav Petkov } 17536e898d2bSTony W Wang-oc 17546e898d2bSTony W Wang-oc if (c->x86_vendor == X86_VENDOR_ZHAOXIN) { 17556e898d2bSTony W Wang-oc /* 17566e898d2bSTony W Wang-oc * All newer Zhaoxin CPUs support MCE broadcasting. Enable 17576e898d2bSTony W Wang-oc * synchronization with a one second timeout. 17586e898d2bSTony W Wang-oc */ 17596e898d2bSTony W Wang-oc if (c->x86 > 6 || (c->x86_model == 0x19 || c->x86_model == 0x1f)) { 17606e898d2bSTony W Wang-oc if (cfg->monarch_timeout < 0) 17616e898d2bSTony W Wang-oc cfg->monarch_timeout = USEC_PER_SEC; 17626e898d2bSTony W Wang-oc } 17636e898d2bSTony W Wang-oc } 17646e898d2bSTony W Wang-oc 176521afaf18SBorislav Petkov if (cfg->monarch_timeout < 0) 176621afaf18SBorislav Petkov cfg->monarch_timeout = 0; 176721afaf18SBorislav Petkov if (cfg->bootlog != 0) 176821afaf18SBorislav Petkov cfg->panic_timeout = 30; 176921afaf18SBorislav Petkov 177021afaf18SBorislav Petkov return 0; 177121afaf18SBorislav Petkov } 177221afaf18SBorislav Petkov 177321afaf18SBorislav Petkov static int __mcheck_cpu_ancient_init(struct cpuinfo_x86 *c) 177421afaf18SBorislav Petkov { 177521afaf18SBorislav Petkov if (c->x86 != 5) 177621afaf18SBorislav Petkov return 0; 177721afaf18SBorislav Petkov 177821afaf18SBorislav Petkov switch (c->x86_vendor) { 177921afaf18SBorislav Petkov case X86_VENDOR_INTEL: 178021afaf18SBorislav Petkov intel_p5_mcheck_init(c); 178121afaf18SBorislav Petkov return 1; 178221afaf18SBorislav Petkov break; 178321afaf18SBorislav Petkov case X86_VENDOR_CENTAUR: 178421afaf18SBorislav Petkov winchip_mcheck_init(c); 178521afaf18SBorislav Petkov return 1; 178621afaf18SBorislav Petkov break; 178721afaf18SBorislav Petkov default: 178821afaf18SBorislav Petkov return 0; 178921afaf18SBorislav Petkov } 179021afaf18SBorislav Petkov 179121afaf18SBorislav Petkov return 0; 179221afaf18SBorislav Petkov } 179321afaf18SBorislav Petkov 179421afaf18SBorislav Petkov /* 179521afaf18SBorislav Petkov * Init basic CPU features needed for early decoding of MCEs. 179621afaf18SBorislav Petkov */ 179721afaf18SBorislav Petkov static void __mcheck_cpu_init_early(struct cpuinfo_x86 *c) 179821afaf18SBorislav Petkov { 179921afaf18SBorislav Petkov if (c->x86_vendor == X86_VENDOR_AMD || c->x86_vendor == X86_VENDOR_HYGON) { 180021afaf18SBorislav Petkov mce_flags.overflow_recov = !!cpu_has(c, X86_FEATURE_OVERFLOW_RECOV); 180121afaf18SBorislav Petkov mce_flags.succor = !!cpu_has(c, X86_FEATURE_SUCCOR); 180221afaf18SBorislav Petkov mce_flags.smca = !!cpu_has(c, X86_FEATURE_SMCA); 1803c9bf318fSThomas Gleixner mce_flags.amd_threshold = 1; 180421afaf18SBorislav Petkov 180521afaf18SBorislav Petkov if (mce_flags.smca) { 180621afaf18SBorislav Petkov msr_ops.ctl = smca_ctl_reg; 180721afaf18SBorislav Petkov msr_ops.status = smca_status_reg; 180821afaf18SBorislav Petkov msr_ops.addr = smca_addr_reg; 180921afaf18SBorislav Petkov msr_ops.misc = smca_misc_reg; 181021afaf18SBorislav Petkov } 181121afaf18SBorislav Petkov } 181221afaf18SBorislav Petkov } 181321afaf18SBorislav Petkov 181421afaf18SBorislav Petkov static void mce_centaur_feature_init(struct cpuinfo_x86 *c) 181521afaf18SBorislav Petkov { 181621afaf18SBorislav Petkov struct mca_config *cfg = &mca_cfg; 181721afaf18SBorislav Petkov 181821afaf18SBorislav Petkov /* 181921afaf18SBorislav Petkov * All newer Centaur CPUs support MCE broadcasting. Enable 182021afaf18SBorislav Petkov * synchronization with a one second timeout. 182121afaf18SBorislav Petkov */ 182221afaf18SBorislav Petkov if ((c->x86 == 6 && c->x86_model == 0xf && c->x86_stepping >= 0xe) || 182321afaf18SBorislav Petkov c->x86 > 6) { 182421afaf18SBorislav Petkov if (cfg->monarch_timeout < 0) 182521afaf18SBorislav Petkov cfg->monarch_timeout = USEC_PER_SEC; 182621afaf18SBorislav Petkov } 182721afaf18SBorislav Petkov } 182821afaf18SBorislav Petkov 18295a3d56a0STony W Wang-oc static void mce_zhaoxin_feature_init(struct cpuinfo_x86 *c) 18305a3d56a0STony W Wang-oc { 18315a3d56a0STony W Wang-oc struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array); 18325a3d56a0STony W Wang-oc 18335a3d56a0STony W Wang-oc /* 18345a3d56a0STony W Wang-oc * These CPUs have MCA bank 8 which reports only one error type called 18355a3d56a0STony W Wang-oc * SVAD (System View Address Decoder). The reporting of that error is 18365a3d56a0STony W Wang-oc * controlled by IA32_MC8.CTL.0. 18375a3d56a0STony W Wang-oc * 18385a3d56a0STony W Wang-oc * If enabled, prefetching on these CPUs will cause SVAD MCE when 18395a3d56a0STony W Wang-oc * virtual machines start and result in a system panic. Always disable 18405a3d56a0STony W Wang-oc * bank 8 SVAD error by default. 18415a3d56a0STony W Wang-oc */ 18425a3d56a0STony W Wang-oc if ((c->x86 == 7 && c->x86_model == 0x1b) || 18435a3d56a0STony W Wang-oc (c->x86_model == 0x19 || c->x86_model == 0x1f)) { 18445a3d56a0STony W Wang-oc if (this_cpu_read(mce_num_banks) > 8) 18455a3d56a0STony W Wang-oc mce_banks[8].ctl = 0; 18465a3d56a0STony W Wang-oc } 18475a3d56a0STony W Wang-oc 18485a3d56a0STony W Wang-oc intel_init_cmci(); 184970f0c230STony W Wang-oc intel_init_lmce(); 18505a3d56a0STony W Wang-oc mce_adjust_timer = cmci_intel_adjust_timer; 18515a3d56a0STony W Wang-oc } 18525a3d56a0STony W Wang-oc 185370f0c230STony W Wang-oc static void mce_zhaoxin_feature_clear(struct cpuinfo_x86 *c) 185470f0c230STony W Wang-oc { 185570f0c230STony W Wang-oc intel_clear_lmce(); 185670f0c230STony W Wang-oc } 185770f0c230STony W Wang-oc 185821afaf18SBorislav Petkov static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c) 185921afaf18SBorislav Petkov { 186021afaf18SBorislav Petkov switch (c->x86_vendor) { 186121afaf18SBorislav Petkov case X86_VENDOR_INTEL: 186221afaf18SBorislav Petkov mce_intel_feature_init(c); 186321afaf18SBorislav Petkov mce_adjust_timer = cmci_intel_adjust_timer; 186421afaf18SBorislav Petkov break; 186521afaf18SBorislav Petkov 186621afaf18SBorislav Petkov case X86_VENDOR_AMD: { 186721afaf18SBorislav Petkov mce_amd_feature_init(c); 186821afaf18SBorislav Petkov break; 186921afaf18SBorislav Petkov } 187021afaf18SBorislav Petkov 187121afaf18SBorislav Petkov case X86_VENDOR_HYGON: 187221afaf18SBorislav Petkov mce_hygon_feature_init(c); 187321afaf18SBorislav Petkov break; 187421afaf18SBorislav Petkov 187521afaf18SBorislav Petkov case X86_VENDOR_CENTAUR: 187621afaf18SBorislav Petkov mce_centaur_feature_init(c); 187721afaf18SBorislav Petkov break; 187821afaf18SBorislav Petkov 18795a3d56a0STony W Wang-oc case X86_VENDOR_ZHAOXIN: 18805a3d56a0STony W Wang-oc mce_zhaoxin_feature_init(c); 18815a3d56a0STony W Wang-oc break; 18825a3d56a0STony W Wang-oc 188321afaf18SBorislav Petkov default: 188421afaf18SBorislav Petkov break; 188521afaf18SBorislav Petkov } 188621afaf18SBorislav Petkov } 188721afaf18SBorislav Petkov 188821afaf18SBorislav Petkov static void __mcheck_cpu_clear_vendor(struct cpuinfo_x86 *c) 188921afaf18SBorislav Petkov { 189021afaf18SBorislav Petkov switch (c->x86_vendor) { 189121afaf18SBorislav Petkov case X86_VENDOR_INTEL: 189221afaf18SBorislav Petkov mce_intel_feature_clear(c); 189321afaf18SBorislav Petkov break; 189470f0c230STony W Wang-oc 189570f0c230STony W Wang-oc case X86_VENDOR_ZHAOXIN: 189670f0c230STony W Wang-oc mce_zhaoxin_feature_clear(c); 189770f0c230STony W Wang-oc break; 189870f0c230STony W Wang-oc 189921afaf18SBorislav Petkov default: 190021afaf18SBorislav Petkov break; 190121afaf18SBorislav Petkov } 190221afaf18SBorislav Petkov } 190321afaf18SBorislav Petkov 190421afaf18SBorislav Petkov static void mce_start_timer(struct timer_list *t) 190521afaf18SBorislav Petkov { 190621afaf18SBorislav Petkov unsigned long iv = check_interval * HZ; 190721afaf18SBorislav Petkov 190821afaf18SBorislav Petkov if (mca_cfg.ignore_ce || !iv) 190921afaf18SBorislav Petkov return; 191021afaf18SBorislav Petkov 191121afaf18SBorislav Petkov this_cpu_write(mce_next_interval, iv); 191221afaf18SBorislav Petkov __start_timer(t, iv); 191321afaf18SBorislav Petkov } 191421afaf18SBorislav Petkov 191521afaf18SBorislav Petkov static void __mcheck_cpu_setup_timer(void) 191621afaf18SBorislav Petkov { 191721afaf18SBorislav Petkov struct timer_list *t = this_cpu_ptr(&mce_timer); 191821afaf18SBorislav Petkov 191921afaf18SBorislav Petkov timer_setup(t, mce_timer_fn, TIMER_PINNED); 192021afaf18SBorislav Petkov } 192121afaf18SBorislav Petkov 192221afaf18SBorislav Petkov static void __mcheck_cpu_init_timer(void) 192321afaf18SBorislav Petkov { 192421afaf18SBorislav Petkov struct timer_list *t = this_cpu_ptr(&mce_timer); 192521afaf18SBorislav Petkov 192621afaf18SBorislav Petkov timer_setup(t, mce_timer_fn, TIMER_PINNED); 192721afaf18SBorislav Petkov mce_start_timer(t); 192821afaf18SBorislav Petkov } 192921afaf18SBorislav Petkov 193045d4b7b9SYazen Ghannam bool filter_mce(struct mce *m) 193145d4b7b9SYazen Ghannam { 193271a84402SYazen Ghannam if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) 193371a84402SYazen Ghannam return amd_filter_mce(m); 19342976908eSPrarit Bhargava if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) 19352976908eSPrarit Bhargava return intel_filter_mce(m); 193671a84402SYazen Ghannam 193745d4b7b9SYazen Ghannam return false; 193845d4b7b9SYazen Ghannam } 193945d4b7b9SYazen Ghannam 194021afaf18SBorislav Petkov /* Handle unconfigured int18 (should never happen) */ 1941865d3a9aSThomas Gleixner static noinstr void unexpected_machine_check(struct pt_regs *regs) 194221afaf18SBorislav Petkov { 1943865d3a9aSThomas Gleixner instrumentation_begin(); 194421afaf18SBorislav Petkov pr_err("CPU#%d: Unexpected int18 (Machine Check)\n", 194521afaf18SBorislav Petkov smp_processor_id()); 1946865d3a9aSThomas Gleixner instrumentation_end(); 194721afaf18SBorislav Petkov } 194821afaf18SBorislav Petkov 194921afaf18SBorislav Petkov /* Call the installed machine check handler for this CPU setup. */ 19508cd501c1SThomas Gleixner void (*machine_check_vector)(struct pt_regs *) = unexpected_machine_check; 195121afaf18SBorislav Petkov 19524c0dcd83SThomas Gleixner static __always_inline void exc_machine_check_kernel(struct pt_regs *regs) 195321afaf18SBorislav Petkov { 195413cbc0cdSAndy Lutomirski WARN_ON_ONCE(user_mode(regs)); 195513cbc0cdSAndy Lutomirski 19564c0dcd83SThomas Gleixner /* 19574c0dcd83SThomas Gleixner * Only required when from kernel mode. See 19584c0dcd83SThomas Gleixner * mce_check_crashing_cpu() for details. 19594c0dcd83SThomas Gleixner */ 196094a46d31SThomas Gleixner if (machine_check_vector == do_machine_check && 196194a46d31SThomas Gleixner mce_check_crashing_cpu()) 196294a46d31SThomas Gleixner return; 196394a46d31SThomas Gleixner 196494a46d31SThomas Gleixner nmi_enter(); 1965865d3a9aSThomas Gleixner /* 1966865d3a9aSThomas Gleixner * The call targets are marked noinstr, but objtool can't figure 1967865d3a9aSThomas Gleixner * that out because it's an indirect call. Annotate it. 1968865d3a9aSThomas Gleixner */ 1969865d3a9aSThomas Gleixner instrumentation_begin(); 1970bf2b3008SPeter Zijlstra trace_hardirqs_off_finish(); 19718cd501c1SThomas Gleixner machine_check_vector(regs); 19723ffdfdceSThomas Gleixner if (regs->flags & X86_EFLAGS_IF) 19733ffdfdceSThomas Gleixner trace_hardirqs_on_prepare(); 1974865d3a9aSThomas Gleixner instrumentation_end(); 197594a46d31SThomas Gleixner nmi_exit(); 197621afaf18SBorislav Petkov } 197721afaf18SBorislav Petkov 19784c0dcd83SThomas Gleixner static __always_inline void exc_machine_check_user(struct pt_regs *regs) 19794c0dcd83SThomas Gleixner { 1980517e4992SThomas Gleixner irqentry_enter_from_user_mode(regs); 1981865d3a9aSThomas Gleixner instrumentation_begin(); 19824c0dcd83SThomas Gleixner machine_check_vector(regs); 1983865d3a9aSThomas Gleixner instrumentation_end(); 1984517e4992SThomas Gleixner irqentry_exit_to_user_mode(regs); 19854c0dcd83SThomas Gleixner } 19864c0dcd83SThomas Gleixner 19874c0dcd83SThomas Gleixner #ifdef CONFIG_X86_64 19884c0dcd83SThomas Gleixner /* MCE hit kernel mode */ 19894c0dcd83SThomas Gleixner DEFINE_IDTENTRY_MCE(exc_machine_check) 19904c0dcd83SThomas Gleixner { 1991cd840e42SPeter Zijlstra unsigned long dr7; 1992cd840e42SPeter Zijlstra 1993cd840e42SPeter Zijlstra dr7 = local_db_save(); 19944c0dcd83SThomas Gleixner exc_machine_check_kernel(regs); 1995cd840e42SPeter Zijlstra local_db_restore(dr7); 19964c0dcd83SThomas Gleixner } 19974c0dcd83SThomas Gleixner 19984c0dcd83SThomas Gleixner /* The user mode variant. */ 19994c0dcd83SThomas Gleixner DEFINE_IDTENTRY_MCE_USER(exc_machine_check) 20004c0dcd83SThomas Gleixner { 2001cd840e42SPeter Zijlstra unsigned long dr7; 2002cd840e42SPeter Zijlstra 2003cd840e42SPeter Zijlstra dr7 = local_db_save(); 20044c0dcd83SThomas Gleixner exc_machine_check_user(regs); 2005cd840e42SPeter Zijlstra local_db_restore(dr7); 20064c0dcd83SThomas Gleixner } 20074c0dcd83SThomas Gleixner #else 20084c0dcd83SThomas Gleixner /* 32bit unified entry point */ 200913cbc0cdSAndy Lutomirski DEFINE_IDTENTRY_RAW(exc_machine_check) 20104c0dcd83SThomas Gleixner { 2011cd840e42SPeter Zijlstra unsigned long dr7; 2012cd840e42SPeter Zijlstra 2013cd840e42SPeter Zijlstra dr7 = local_db_save(); 20144c0dcd83SThomas Gleixner if (user_mode(regs)) 20154c0dcd83SThomas Gleixner exc_machine_check_user(regs); 20164c0dcd83SThomas Gleixner else 20174c0dcd83SThomas Gleixner exc_machine_check_kernel(regs); 2018cd840e42SPeter Zijlstra local_db_restore(dr7); 20194c0dcd83SThomas Gleixner } 20204c0dcd83SThomas Gleixner #endif 202121afaf18SBorislav Petkov 202221afaf18SBorislav Petkov /* 202321afaf18SBorislav Petkov * Called for each booted CPU to set up machine checks. 202421afaf18SBorislav Petkov * Must be called with preempt off: 202521afaf18SBorislav Petkov */ 202621afaf18SBorislav Petkov void mcheck_cpu_init(struct cpuinfo_x86 *c) 202721afaf18SBorislav Petkov { 202821afaf18SBorislav Petkov if (mca_cfg.disabled) 202921afaf18SBorislav Petkov return; 203021afaf18SBorislav Petkov 203121afaf18SBorislav Petkov if (__mcheck_cpu_ancient_init(c)) 203221afaf18SBorislav Petkov return; 203321afaf18SBorislav Petkov 203421afaf18SBorislav Petkov if (!mce_available(c)) 203521afaf18SBorislav Petkov return; 203621afaf18SBorislav Petkov 2037b4914508SYazen Ghannam __mcheck_cpu_cap_init(); 2038b4914508SYazen Ghannam 2039b4914508SYazen Ghannam if (__mcheck_cpu_apply_quirks(c) < 0) { 204021afaf18SBorislav Petkov mca_cfg.disabled = 1; 204121afaf18SBorislav Petkov return; 204221afaf18SBorislav Petkov } 204321afaf18SBorislav Petkov 204421afaf18SBorislav Petkov if (mce_gen_pool_init()) { 204521afaf18SBorislav Petkov mca_cfg.disabled = 1; 204621afaf18SBorislav Petkov pr_emerg("Couldn't allocate MCE records pool!\n"); 204721afaf18SBorislav Petkov return; 204821afaf18SBorislav Petkov } 204921afaf18SBorislav Petkov 205021afaf18SBorislav Petkov machine_check_vector = do_machine_check; 205121afaf18SBorislav Petkov 205221afaf18SBorislav Petkov __mcheck_cpu_init_early(c); 205321afaf18SBorislav Petkov __mcheck_cpu_init_generic(); 205421afaf18SBorislav Petkov __mcheck_cpu_init_vendor(c); 205521afaf18SBorislav Petkov __mcheck_cpu_init_clear_banks(); 2056068b053dSYazen Ghannam __mcheck_cpu_check_banks(); 205721afaf18SBorislav Petkov __mcheck_cpu_setup_timer(); 205821afaf18SBorislav Petkov } 205921afaf18SBorislav Petkov 206021afaf18SBorislav Petkov /* 206121afaf18SBorislav Petkov * Called for each booted CPU to clear some machine checks opt-ins 206221afaf18SBorislav Petkov */ 206321afaf18SBorislav Petkov void mcheck_cpu_clear(struct cpuinfo_x86 *c) 206421afaf18SBorislav Petkov { 206521afaf18SBorislav Petkov if (mca_cfg.disabled) 206621afaf18SBorislav Petkov return; 206721afaf18SBorislav Petkov 206821afaf18SBorislav Petkov if (!mce_available(c)) 206921afaf18SBorislav Petkov return; 207021afaf18SBorislav Petkov 207121afaf18SBorislav Petkov /* 207221afaf18SBorislav Petkov * Possibly to clear general settings generic to x86 207321afaf18SBorislav Petkov * __mcheck_cpu_clear_generic(c); 207421afaf18SBorislav Petkov */ 207521afaf18SBorislav Petkov __mcheck_cpu_clear_vendor(c); 207621afaf18SBorislav Petkov 207721afaf18SBorislav Petkov } 207821afaf18SBorislav Petkov 207921afaf18SBorislav Petkov static void __mce_disable_bank(void *arg) 208021afaf18SBorislav Petkov { 208121afaf18SBorislav Petkov int bank = *((int *)arg); 208221afaf18SBorislav Petkov __clear_bit(bank, this_cpu_ptr(mce_poll_banks)); 208321afaf18SBorislav Petkov cmci_disable_bank(bank); 208421afaf18SBorislav Petkov } 208521afaf18SBorislav Petkov 208621afaf18SBorislav Petkov void mce_disable_bank(int bank) 208721afaf18SBorislav Petkov { 2088c7d314f3SYazen Ghannam if (bank >= this_cpu_read(mce_num_banks)) { 208921afaf18SBorislav Petkov pr_warn(FW_BUG 209021afaf18SBorislav Petkov "Ignoring request to disable invalid MCA bank %d.\n", 209121afaf18SBorislav Petkov bank); 209221afaf18SBorislav Petkov return; 209321afaf18SBorislav Petkov } 209421afaf18SBorislav Petkov set_bit(bank, mce_banks_ce_disabled); 209521afaf18SBorislav Petkov on_each_cpu(__mce_disable_bank, &bank, 1); 209621afaf18SBorislav Petkov } 209721afaf18SBorislav Petkov 209821afaf18SBorislav Petkov /* 209921afaf18SBorislav Petkov * mce=off Disables machine check 210021afaf18SBorislav Petkov * mce=no_cmci Disables CMCI 210121afaf18SBorislav Petkov * mce=no_lmce Disables LMCE 210221afaf18SBorislav Petkov * mce=dont_log_ce Clears corrected events silently, no log created for CEs. 210343505646STony Luck * mce=print_all Print all machine check logs to console 210421afaf18SBorislav Petkov * mce=ignore_ce Disables polling and CMCI, corrected events are not cleared. 210521afaf18SBorislav Petkov * mce=TOLERANCELEVEL[,monarchtimeout] (number, see above) 210621afaf18SBorislav Petkov * monarchtimeout is how long to wait for other CPUs on machine 210721afaf18SBorislav Petkov * check, or 0 to not wait 210821afaf18SBorislav Petkov * mce=bootlog Log MCEs from before booting. Disabled by default on AMD Fam10h 210921afaf18SBorislav Petkov and older. 211021afaf18SBorislav Petkov * mce=nobootlog Don't log MCEs from before booting. 211121afaf18SBorislav Petkov * mce=bios_cmci_threshold Don't program the CMCI threshold 211221afaf18SBorislav Petkov * mce=recovery force enable memcpy_mcsafe() 211321afaf18SBorislav Petkov */ 211421afaf18SBorislav Petkov static int __init mcheck_enable(char *str) 211521afaf18SBorislav Petkov { 211621afaf18SBorislav Petkov struct mca_config *cfg = &mca_cfg; 211721afaf18SBorislav Petkov 211821afaf18SBorislav Petkov if (*str == 0) { 211921afaf18SBorislav Petkov enable_p5_mce(); 212021afaf18SBorislav Petkov return 1; 212121afaf18SBorislav Petkov } 212221afaf18SBorislav Petkov if (*str == '=') 212321afaf18SBorislav Petkov str++; 212421afaf18SBorislav Petkov if (!strcmp(str, "off")) 212521afaf18SBorislav Petkov cfg->disabled = 1; 212621afaf18SBorislav Petkov else if (!strcmp(str, "no_cmci")) 212721afaf18SBorislav Petkov cfg->cmci_disabled = true; 212821afaf18SBorislav Petkov else if (!strcmp(str, "no_lmce")) 212921afaf18SBorislav Petkov cfg->lmce_disabled = 1; 213021afaf18SBorislav Petkov else if (!strcmp(str, "dont_log_ce")) 213121afaf18SBorislav Petkov cfg->dont_log_ce = true; 213243505646STony Luck else if (!strcmp(str, "print_all")) 213343505646STony Luck cfg->print_all = true; 213421afaf18SBorislav Petkov else if (!strcmp(str, "ignore_ce")) 213521afaf18SBorislav Petkov cfg->ignore_ce = true; 213621afaf18SBorislav Petkov else if (!strcmp(str, "bootlog") || !strcmp(str, "nobootlog")) 213721afaf18SBorislav Petkov cfg->bootlog = (str[0] == 'b'); 213821afaf18SBorislav Petkov else if (!strcmp(str, "bios_cmci_threshold")) 213921afaf18SBorislav Petkov cfg->bios_cmci_threshold = 1; 214021afaf18SBorislav Petkov else if (!strcmp(str, "recovery")) 214121afaf18SBorislav Petkov cfg->recovery = 1; 214221afaf18SBorislav Petkov else if (isdigit(str[0])) { 214321afaf18SBorislav Petkov if (get_option(&str, &cfg->tolerant) == 2) 214421afaf18SBorislav Petkov get_option(&str, &(cfg->monarch_timeout)); 214521afaf18SBorislav Petkov } else { 214621afaf18SBorislav Petkov pr_info("mce argument %s ignored. Please use /sys\n", str); 214721afaf18SBorislav Petkov return 0; 214821afaf18SBorislav Petkov } 214921afaf18SBorislav Petkov return 1; 215021afaf18SBorislav Petkov } 215121afaf18SBorislav Petkov __setup("mce", mcheck_enable); 215221afaf18SBorislav Petkov 215321afaf18SBorislav Petkov int __init mcheck_init(void) 215421afaf18SBorislav Petkov { 215521afaf18SBorislav Petkov mcheck_intel_therm_init(); 2156c9c6d216STony Luck mce_register_decode_chain(&early_nb); 21578438b84aSJan H. Schönherr mce_register_decode_chain(&mce_uc_nb); 215821afaf18SBorislav Petkov mce_register_decode_chain(&mce_default_nb); 215921afaf18SBorislav Petkov mcheck_vendor_init_severity(); 216021afaf18SBorislav Petkov 216121afaf18SBorislav Petkov INIT_WORK(&mce_work, mce_gen_pool_process); 216221afaf18SBorislav Petkov init_irq_work(&mce_irq_work, mce_irq_work_cb); 216321afaf18SBorislav Petkov 216421afaf18SBorislav Petkov return 0; 216521afaf18SBorislav Petkov } 216621afaf18SBorislav Petkov 216721afaf18SBorislav Petkov /* 216821afaf18SBorislav Petkov * mce_syscore: PM support 216921afaf18SBorislav Petkov */ 217021afaf18SBorislav Petkov 217121afaf18SBorislav Petkov /* 217221afaf18SBorislav Petkov * Disable machine checks on suspend and shutdown. We can't really handle 217321afaf18SBorislav Petkov * them later. 217421afaf18SBorislav Petkov */ 217521afaf18SBorislav Petkov static void mce_disable_error_reporting(void) 217621afaf18SBorislav Petkov { 2177b4914508SYazen Ghannam struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array); 217821afaf18SBorislav Petkov int i; 217921afaf18SBorislav Petkov 2180c7d314f3SYazen Ghannam for (i = 0; i < this_cpu_read(mce_num_banks); i++) { 218121afaf18SBorislav Petkov struct mce_bank *b = &mce_banks[i]; 218221afaf18SBorislav Petkov 218321afaf18SBorislav Petkov if (b->init) 218421afaf18SBorislav Petkov wrmsrl(msr_ops.ctl(i), 0); 218521afaf18SBorislav Petkov } 218621afaf18SBorislav Petkov return; 218721afaf18SBorislav Petkov } 218821afaf18SBorislav Petkov 218921afaf18SBorislav Petkov static void vendor_disable_error_reporting(void) 219021afaf18SBorislav Petkov { 219121afaf18SBorislav Petkov /* 21926e898d2bSTony W Wang-oc * Don't clear on Intel or AMD or Hygon or Zhaoxin CPUs. Some of these 21936e898d2bSTony W Wang-oc * MSRs are socket-wide. Disabling them for just a single offlined CPU 21946e898d2bSTony W Wang-oc * is bad, since it will inhibit reporting for all shared resources on 21956e898d2bSTony W Wang-oc * the socket like the last level cache (LLC), the integrated memory 21966e898d2bSTony W Wang-oc * controller (iMC), etc. 219721afaf18SBorislav Petkov */ 219821afaf18SBorislav Petkov if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL || 219921afaf18SBorislav Petkov boot_cpu_data.x86_vendor == X86_VENDOR_HYGON || 22006e898d2bSTony W Wang-oc boot_cpu_data.x86_vendor == X86_VENDOR_AMD || 22016e898d2bSTony W Wang-oc boot_cpu_data.x86_vendor == X86_VENDOR_ZHAOXIN) 220221afaf18SBorislav Petkov return; 220321afaf18SBorislav Petkov 220421afaf18SBorislav Petkov mce_disable_error_reporting(); 220521afaf18SBorislav Petkov } 220621afaf18SBorislav Petkov 220721afaf18SBorislav Petkov static int mce_syscore_suspend(void) 220821afaf18SBorislav Petkov { 220921afaf18SBorislav Petkov vendor_disable_error_reporting(); 221021afaf18SBorislav Petkov return 0; 221121afaf18SBorislav Petkov } 221221afaf18SBorislav Petkov 221321afaf18SBorislav Petkov static void mce_syscore_shutdown(void) 221421afaf18SBorislav Petkov { 221521afaf18SBorislav Petkov vendor_disable_error_reporting(); 221621afaf18SBorislav Petkov } 221721afaf18SBorislav Petkov 221821afaf18SBorislav Petkov /* 221921afaf18SBorislav Petkov * On resume clear all MCE state. Don't want to see leftovers from the BIOS. 222021afaf18SBorislav Petkov * Only one CPU is active at this time, the others get re-added later using 222121afaf18SBorislav Petkov * CPU hotplug: 222221afaf18SBorislav Petkov */ 222321afaf18SBorislav Petkov static void mce_syscore_resume(void) 222421afaf18SBorislav Petkov { 222521afaf18SBorislav Petkov __mcheck_cpu_init_generic(); 222621afaf18SBorislav Petkov __mcheck_cpu_init_vendor(raw_cpu_ptr(&cpu_info)); 222721afaf18SBorislav Petkov __mcheck_cpu_init_clear_banks(); 222821afaf18SBorislav Petkov } 222921afaf18SBorislav Petkov 223021afaf18SBorislav Petkov static struct syscore_ops mce_syscore_ops = { 223121afaf18SBorislav Petkov .suspend = mce_syscore_suspend, 223221afaf18SBorislav Petkov .shutdown = mce_syscore_shutdown, 223321afaf18SBorislav Petkov .resume = mce_syscore_resume, 223421afaf18SBorislav Petkov }; 223521afaf18SBorislav Petkov 223621afaf18SBorislav Petkov /* 223721afaf18SBorislav Petkov * mce_device: Sysfs support 223821afaf18SBorislav Petkov */ 223921afaf18SBorislav Petkov 224021afaf18SBorislav Petkov static void mce_cpu_restart(void *data) 224121afaf18SBorislav Petkov { 224221afaf18SBorislav Petkov if (!mce_available(raw_cpu_ptr(&cpu_info))) 224321afaf18SBorislav Petkov return; 224421afaf18SBorislav Petkov __mcheck_cpu_init_generic(); 224521afaf18SBorislav Petkov __mcheck_cpu_init_clear_banks(); 224621afaf18SBorislav Petkov __mcheck_cpu_init_timer(); 224721afaf18SBorislav Petkov } 224821afaf18SBorislav Petkov 224921afaf18SBorislav Petkov /* Reinit MCEs after user configuration changes */ 225021afaf18SBorislav Petkov static void mce_restart(void) 225121afaf18SBorislav Petkov { 225221afaf18SBorislav Petkov mce_timer_delete_all(); 225321afaf18SBorislav Petkov on_each_cpu(mce_cpu_restart, NULL, 1); 225421afaf18SBorislav Petkov } 225521afaf18SBorislav Petkov 225621afaf18SBorislav Petkov /* Toggle features for corrected errors */ 225721afaf18SBorislav Petkov static void mce_disable_cmci(void *data) 225821afaf18SBorislav Petkov { 225921afaf18SBorislav Petkov if (!mce_available(raw_cpu_ptr(&cpu_info))) 226021afaf18SBorislav Petkov return; 226121afaf18SBorislav Petkov cmci_clear(); 226221afaf18SBorislav Petkov } 226321afaf18SBorislav Petkov 226421afaf18SBorislav Petkov static void mce_enable_ce(void *all) 226521afaf18SBorislav Petkov { 226621afaf18SBorislav Petkov if (!mce_available(raw_cpu_ptr(&cpu_info))) 226721afaf18SBorislav Petkov return; 226821afaf18SBorislav Petkov cmci_reenable(); 226921afaf18SBorislav Petkov cmci_recheck(); 227021afaf18SBorislav Petkov if (all) 227121afaf18SBorislav Petkov __mcheck_cpu_init_timer(); 227221afaf18SBorislav Petkov } 227321afaf18SBorislav Petkov 227421afaf18SBorislav Petkov static struct bus_type mce_subsys = { 227521afaf18SBorislav Petkov .name = "machinecheck", 227621afaf18SBorislav Petkov .dev_name = "machinecheck", 227721afaf18SBorislav Petkov }; 227821afaf18SBorislav Petkov 227921afaf18SBorislav Petkov DEFINE_PER_CPU(struct device *, mce_device); 228021afaf18SBorislav Petkov 2281b4914508SYazen Ghannam static inline struct mce_bank_dev *attr_to_bank(struct device_attribute *attr) 228221afaf18SBorislav Petkov { 2283b4914508SYazen Ghannam return container_of(attr, struct mce_bank_dev, attr); 228421afaf18SBorislav Petkov } 228521afaf18SBorislav Petkov 228621afaf18SBorislav Petkov static ssize_t show_bank(struct device *s, struct device_attribute *attr, 228721afaf18SBorislav Petkov char *buf) 228821afaf18SBorislav Petkov { 2289b4914508SYazen Ghannam u8 bank = attr_to_bank(attr)->bank; 2290b4914508SYazen Ghannam struct mce_bank *b; 2291b4914508SYazen Ghannam 2292c7d314f3SYazen Ghannam if (bank >= per_cpu(mce_num_banks, s->id)) 2293b4914508SYazen Ghannam return -EINVAL; 2294b4914508SYazen Ghannam 2295b4914508SYazen Ghannam b = &per_cpu(mce_banks_array, s->id)[bank]; 2296b4914508SYazen Ghannam 2297068b053dSYazen Ghannam if (!b->init) 2298068b053dSYazen Ghannam return -ENODEV; 2299068b053dSYazen Ghannam 2300b4914508SYazen Ghannam return sprintf(buf, "%llx\n", b->ctl); 230121afaf18SBorislav Petkov } 230221afaf18SBorislav Petkov 230321afaf18SBorislav Petkov static ssize_t set_bank(struct device *s, struct device_attribute *attr, 230421afaf18SBorislav Petkov const char *buf, size_t size) 230521afaf18SBorislav Petkov { 2306b4914508SYazen Ghannam u8 bank = attr_to_bank(attr)->bank; 2307b4914508SYazen Ghannam struct mce_bank *b; 230821afaf18SBorislav Petkov u64 new; 230921afaf18SBorislav Petkov 231021afaf18SBorislav Petkov if (kstrtou64(buf, 0, &new) < 0) 231121afaf18SBorislav Petkov return -EINVAL; 231221afaf18SBorislav Petkov 2313c7d314f3SYazen Ghannam if (bank >= per_cpu(mce_num_banks, s->id)) 2314b4914508SYazen Ghannam return -EINVAL; 2315b4914508SYazen Ghannam 2316b4914508SYazen Ghannam b = &per_cpu(mce_banks_array, s->id)[bank]; 2317b4914508SYazen Ghannam 2318068b053dSYazen Ghannam if (!b->init) 2319068b053dSYazen Ghannam return -ENODEV; 2320068b053dSYazen Ghannam 2321b4914508SYazen Ghannam b->ctl = new; 232221afaf18SBorislav Petkov mce_restart(); 232321afaf18SBorislav Petkov 232421afaf18SBorislav Petkov return size; 232521afaf18SBorislav Petkov } 232621afaf18SBorislav Petkov 232721afaf18SBorislav Petkov static ssize_t set_ignore_ce(struct device *s, 232821afaf18SBorislav Petkov struct device_attribute *attr, 232921afaf18SBorislav Petkov const char *buf, size_t size) 233021afaf18SBorislav Petkov { 233121afaf18SBorislav Petkov u64 new; 233221afaf18SBorislav Petkov 233321afaf18SBorislav Petkov if (kstrtou64(buf, 0, &new) < 0) 233421afaf18SBorislav Petkov return -EINVAL; 233521afaf18SBorislav Petkov 233621afaf18SBorislav Petkov mutex_lock(&mce_sysfs_mutex); 233721afaf18SBorislav Petkov if (mca_cfg.ignore_ce ^ !!new) { 233821afaf18SBorislav Petkov if (new) { 233921afaf18SBorislav Petkov /* disable ce features */ 234021afaf18SBorislav Petkov mce_timer_delete_all(); 234121afaf18SBorislav Petkov on_each_cpu(mce_disable_cmci, NULL, 1); 234221afaf18SBorislav Petkov mca_cfg.ignore_ce = true; 234321afaf18SBorislav Petkov } else { 234421afaf18SBorislav Petkov /* enable ce features */ 234521afaf18SBorislav Petkov mca_cfg.ignore_ce = false; 234621afaf18SBorislav Petkov on_each_cpu(mce_enable_ce, (void *)1, 1); 234721afaf18SBorislav Petkov } 234821afaf18SBorislav Petkov } 234921afaf18SBorislav Petkov mutex_unlock(&mce_sysfs_mutex); 235021afaf18SBorislav Petkov 235121afaf18SBorislav Petkov return size; 235221afaf18SBorislav Petkov } 235321afaf18SBorislav Petkov 235421afaf18SBorislav Petkov static ssize_t set_cmci_disabled(struct device *s, 235521afaf18SBorislav Petkov struct device_attribute *attr, 235621afaf18SBorislav Petkov const char *buf, size_t size) 235721afaf18SBorislav Petkov { 235821afaf18SBorislav Petkov u64 new; 235921afaf18SBorislav Petkov 236021afaf18SBorislav Petkov if (kstrtou64(buf, 0, &new) < 0) 236121afaf18SBorislav Petkov return -EINVAL; 236221afaf18SBorislav Petkov 236321afaf18SBorislav Petkov mutex_lock(&mce_sysfs_mutex); 236421afaf18SBorislav Petkov if (mca_cfg.cmci_disabled ^ !!new) { 236521afaf18SBorislav Petkov if (new) { 236621afaf18SBorislav Petkov /* disable cmci */ 236721afaf18SBorislav Petkov on_each_cpu(mce_disable_cmci, NULL, 1); 236821afaf18SBorislav Petkov mca_cfg.cmci_disabled = true; 236921afaf18SBorislav Petkov } else { 237021afaf18SBorislav Petkov /* enable cmci */ 237121afaf18SBorislav Petkov mca_cfg.cmci_disabled = false; 237221afaf18SBorislav Petkov on_each_cpu(mce_enable_ce, NULL, 1); 237321afaf18SBorislav Petkov } 237421afaf18SBorislav Petkov } 237521afaf18SBorislav Petkov mutex_unlock(&mce_sysfs_mutex); 237621afaf18SBorislav Petkov 237721afaf18SBorislav Petkov return size; 237821afaf18SBorislav Petkov } 237921afaf18SBorislav Petkov 238021afaf18SBorislav Petkov static ssize_t store_int_with_restart(struct device *s, 238121afaf18SBorislav Petkov struct device_attribute *attr, 238221afaf18SBorislav Petkov const char *buf, size_t size) 238321afaf18SBorislav Petkov { 238421afaf18SBorislav Petkov unsigned long old_check_interval = check_interval; 238521afaf18SBorislav Petkov ssize_t ret = device_store_ulong(s, attr, buf, size); 238621afaf18SBorislav Petkov 238721afaf18SBorislav Petkov if (check_interval == old_check_interval) 238821afaf18SBorislav Petkov return ret; 238921afaf18SBorislav Petkov 239021afaf18SBorislav Petkov mutex_lock(&mce_sysfs_mutex); 239121afaf18SBorislav Petkov mce_restart(); 239221afaf18SBorislav Petkov mutex_unlock(&mce_sysfs_mutex); 239321afaf18SBorislav Petkov 239421afaf18SBorislav Petkov return ret; 239521afaf18SBorislav Petkov } 239621afaf18SBorislav Petkov 239721afaf18SBorislav Petkov static DEVICE_INT_ATTR(tolerant, 0644, mca_cfg.tolerant); 239821afaf18SBorislav Petkov static DEVICE_INT_ATTR(monarch_timeout, 0644, mca_cfg.monarch_timeout); 239921afaf18SBorislav Petkov static DEVICE_BOOL_ATTR(dont_log_ce, 0644, mca_cfg.dont_log_ce); 240043505646STony Luck static DEVICE_BOOL_ATTR(print_all, 0644, mca_cfg.print_all); 240121afaf18SBorislav Petkov 240221afaf18SBorislav Petkov static struct dev_ext_attribute dev_attr_check_interval = { 240321afaf18SBorislav Petkov __ATTR(check_interval, 0644, device_show_int, store_int_with_restart), 240421afaf18SBorislav Petkov &check_interval 240521afaf18SBorislav Petkov }; 240621afaf18SBorislav Petkov 240721afaf18SBorislav Petkov static struct dev_ext_attribute dev_attr_ignore_ce = { 240821afaf18SBorislav Petkov __ATTR(ignore_ce, 0644, device_show_bool, set_ignore_ce), 240921afaf18SBorislav Petkov &mca_cfg.ignore_ce 241021afaf18SBorislav Petkov }; 241121afaf18SBorislav Petkov 241221afaf18SBorislav Petkov static struct dev_ext_attribute dev_attr_cmci_disabled = { 241321afaf18SBorislav Petkov __ATTR(cmci_disabled, 0644, device_show_bool, set_cmci_disabled), 241421afaf18SBorislav Petkov &mca_cfg.cmci_disabled 241521afaf18SBorislav Petkov }; 241621afaf18SBorislav Petkov 241721afaf18SBorislav Petkov static struct device_attribute *mce_device_attrs[] = { 241821afaf18SBorislav Petkov &dev_attr_tolerant.attr, 241921afaf18SBorislav Petkov &dev_attr_check_interval.attr, 242021afaf18SBorislav Petkov #ifdef CONFIG_X86_MCELOG_LEGACY 242121afaf18SBorislav Petkov &dev_attr_trigger, 242221afaf18SBorislav Petkov #endif 242321afaf18SBorislav Petkov &dev_attr_monarch_timeout.attr, 242421afaf18SBorislav Petkov &dev_attr_dont_log_ce.attr, 242543505646STony Luck &dev_attr_print_all.attr, 242621afaf18SBorislav Petkov &dev_attr_ignore_ce.attr, 242721afaf18SBorislav Petkov &dev_attr_cmci_disabled.attr, 242821afaf18SBorislav Petkov NULL 242921afaf18SBorislav Petkov }; 243021afaf18SBorislav Petkov 243121afaf18SBorislav Petkov static cpumask_var_t mce_device_initialized; 243221afaf18SBorislav Petkov 243321afaf18SBorislav Petkov static void mce_device_release(struct device *dev) 243421afaf18SBorislav Petkov { 243521afaf18SBorislav Petkov kfree(dev); 243621afaf18SBorislav Petkov } 243721afaf18SBorislav Petkov 2438b4914508SYazen Ghannam /* Per CPU device init. All of the CPUs still share the same bank device: */ 243921afaf18SBorislav Petkov static int mce_device_create(unsigned int cpu) 244021afaf18SBorislav Petkov { 244121afaf18SBorislav Petkov struct device *dev; 244221afaf18SBorislav Petkov int err; 244321afaf18SBorislav Petkov int i, j; 244421afaf18SBorislav Petkov 244521afaf18SBorislav Petkov if (!mce_available(&boot_cpu_data)) 244621afaf18SBorislav Petkov return -EIO; 244721afaf18SBorislav Petkov 244821afaf18SBorislav Petkov dev = per_cpu(mce_device, cpu); 244921afaf18SBorislav Petkov if (dev) 245021afaf18SBorislav Petkov return 0; 245121afaf18SBorislav Petkov 245221afaf18SBorislav Petkov dev = kzalloc(sizeof(*dev), GFP_KERNEL); 245321afaf18SBorislav Petkov if (!dev) 245421afaf18SBorislav Petkov return -ENOMEM; 245521afaf18SBorislav Petkov dev->id = cpu; 245621afaf18SBorislav Petkov dev->bus = &mce_subsys; 245721afaf18SBorislav Petkov dev->release = &mce_device_release; 245821afaf18SBorislav Petkov 245921afaf18SBorislav Petkov err = device_register(dev); 246021afaf18SBorislav Petkov if (err) { 246121afaf18SBorislav Petkov put_device(dev); 246221afaf18SBorislav Petkov return err; 246321afaf18SBorislav Petkov } 246421afaf18SBorislav Petkov 246521afaf18SBorislav Petkov for (i = 0; mce_device_attrs[i]; i++) { 246621afaf18SBorislav Petkov err = device_create_file(dev, mce_device_attrs[i]); 246721afaf18SBorislav Petkov if (err) 246821afaf18SBorislav Petkov goto error; 246921afaf18SBorislav Petkov } 2470c7d314f3SYazen Ghannam for (j = 0; j < per_cpu(mce_num_banks, cpu); j++) { 2471b4914508SYazen Ghannam err = device_create_file(dev, &mce_bank_devs[j].attr); 247221afaf18SBorislav Petkov if (err) 247321afaf18SBorislav Petkov goto error2; 247421afaf18SBorislav Petkov } 247521afaf18SBorislav Petkov cpumask_set_cpu(cpu, mce_device_initialized); 247621afaf18SBorislav Petkov per_cpu(mce_device, cpu) = dev; 247721afaf18SBorislav Petkov 247821afaf18SBorislav Petkov return 0; 247921afaf18SBorislav Petkov error2: 248021afaf18SBorislav Petkov while (--j >= 0) 2481b4914508SYazen Ghannam device_remove_file(dev, &mce_bank_devs[j].attr); 248221afaf18SBorislav Petkov error: 248321afaf18SBorislav Petkov while (--i >= 0) 248421afaf18SBorislav Petkov device_remove_file(dev, mce_device_attrs[i]); 248521afaf18SBorislav Petkov 248621afaf18SBorislav Petkov device_unregister(dev); 248721afaf18SBorislav Petkov 248821afaf18SBorislav Petkov return err; 248921afaf18SBorislav Petkov } 249021afaf18SBorislav Petkov 249121afaf18SBorislav Petkov static void mce_device_remove(unsigned int cpu) 249221afaf18SBorislav Petkov { 249321afaf18SBorislav Petkov struct device *dev = per_cpu(mce_device, cpu); 249421afaf18SBorislav Petkov int i; 249521afaf18SBorislav Petkov 249621afaf18SBorislav Petkov if (!cpumask_test_cpu(cpu, mce_device_initialized)) 249721afaf18SBorislav Petkov return; 249821afaf18SBorislav Petkov 249921afaf18SBorislav Petkov for (i = 0; mce_device_attrs[i]; i++) 250021afaf18SBorislav Petkov device_remove_file(dev, mce_device_attrs[i]); 250121afaf18SBorislav Petkov 2502c7d314f3SYazen Ghannam for (i = 0; i < per_cpu(mce_num_banks, cpu); i++) 2503b4914508SYazen Ghannam device_remove_file(dev, &mce_bank_devs[i].attr); 250421afaf18SBorislav Petkov 250521afaf18SBorislav Petkov device_unregister(dev); 250621afaf18SBorislav Petkov cpumask_clear_cpu(cpu, mce_device_initialized); 250721afaf18SBorislav Petkov per_cpu(mce_device, cpu) = NULL; 250821afaf18SBorislav Petkov } 250921afaf18SBorislav Petkov 251021afaf18SBorislav Petkov /* Make sure there are no machine checks on offlined CPUs. */ 251121afaf18SBorislav Petkov static void mce_disable_cpu(void) 251221afaf18SBorislav Petkov { 251321afaf18SBorislav Petkov if (!mce_available(raw_cpu_ptr(&cpu_info))) 251421afaf18SBorislav Petkov return; 251521afaf18SBorislav Petkov 251621afaf18SBorislav Petkov if (!cpuhp_tasks_frozen) 251721afaf18SBorislav Petkov cmci_clear(); 251821afaf18SBorislav Petkov 251921afaf18SBorislav Petkov vendor_disable_error_reporting(); 252021afaf18SBorislav Petkov } 252121afaf18SBorislav Petkov 252221afaf18SBorislav Petkov static void mce_reenable_cpu(void) 252321afaf18SBorislav Petkov { 2524b4914508SYazen Ghannam struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array); 252521afaf18SBorislav Petkov int i; 252621afaf18SBorislav Petkov 252721afaf18SBorislav Petkov if (!mce_available(raw_cpu_ptr(&cpu_info))) 252821afaf18SBorislav Petkov return; 252921afaf18SBorislav Petkov 253021afaf18SBorislav Petkov if (!cpuhp_tasks_frozen) 253121afaf18SBorislav Petkov cmci_reenable(); 2532c7d314f3SYazen Ghannam for (i = 0; i < this_cpu_read(mce_num_banks); i++) { 253321afaf18SBorislav Petkov struct mce_bank *b = &mce_banks[i]; 253421afaf18SBorislav Petkov 253521afaf18SBorislav Petkov if (b->init) 253621afaf18SBorislav Petkov wrmsrl(msr_ops.ctl(i), b->ctl); 253721afaf18SBorislav Petkov } 253821afaf18SBorislav Petkov } 253921afaf18SBorislav Petkov 254021afaf18SBorislav Petkov static int mce_cpu_dead(unsigned int cpu) 254121afaf18SBorislav Petkov { 254221afaf18SBorislav Petkov mce_intel_hcpu_update(cpu); 254321afaf18SBorislav Petkov 254421afaf18SBorislav Petkov /* intentionally ignoring frozen here */ 254521afaf18SBorislav Petkov if (!cpuhp_tasks_frozen) 254621afaf18SBorislav Petkov cmci_rediscover(); 254721afaf18SBorislav Petkov return 0; 254821afaf18SBorislav Petkov } 254921afaf18SBorislav Petkov 255021afaf18SBorislav Petkov static int mce_cpu_online(unsigned int cpu) 255121afaf18SBorislav Petkov { 255221afaf18SBorislav Petkov struct timer_list *t = this_cpu_ptr(&mce_timer); 255321afaf18SBorislav Petkov int ret; 255421afaf18SBorislav Petkov 255521afaf18SBorislav Petkov mce_device_create(cpu); 255621afaf18SBorislav Petkov 255721afaf18SBorislav Petkov ret = mce_threshold_create_device(cpu); 255821afaf18SBorislav Petkov if (ret) { 255921afaf18SBorislav Petkov mce_device_remove(cpu); 256021afaf18SBorislav Petkov return ret; 256121afaf18SBorislav Petkov } 256221afaf18SBorislav Petkov mce_reenable_cpu(); 256321afaf18SBorislav Petkov mce_start_timer(t); 256421afaf18SBorislav Petkov return 0; 256521afaf18SBorislav Petkov } 256621afaf18SBorislav Petkov 256721afaf18SBorislav Petkov static int mce_cpu_pre_down(unsigned int cpu) 256821afaf18SBorislav Petkov { 256921afaf18SBorislav Petkov struct timer_list *t = this_cpu_ptr(&mce_timer); 257021afaf18SBorislav Petkov 257121afaf18SBorislav Petkov mce_disable_cpu(); 257221afaf18SBorislav Petkov del_timer_sync(t); 257321afaf18SBorislav Petkov mce_threshold_remove_device(cpu); 257421afaf18SBorislav Petkov mce_device_remove(cpu); 257521afaf18SBorislav Petkov return 0; 257621afaf18SBorislav Petkov } 257721afaf18SBorislav Petkov 257821afaf18SBorislav Petkov static __init void mce_init_banks(void) 257921afaf18SBorislav Petkov { 258021afaf18SBorislav Petkov int i; 258121afaf18SBorislav Petkov 2582b4914508SYazen Ghannam for (i = 0; i < MAX_NR_BANKS; i++) { 2583b4914508SYazen Ghannam struct mce_bank_dev *b = &mce_bank_devs[i]; 258421afaf18SBorislav Petkov struct device_attribute *a = &b->attr; 258521afaf18SBorislav Petkov 2586b4914508SYazen Ghannam b->bank = i; 2587b4914508SYazen Ghannam 258821afaf18SBorislav Petkov sysfs_attr_init(&a->attr); 258921afaf18SBorislav Petkov a->attr.name = b->attrname; 259021afaf18SBorislav Petkov snprintf(b->attrname, ATTR_LEN, "bank%d", i); 259121afaf18SBorislav Petkov 259221afaf18SBorislav Petkov a->attr.mode = 0644; 259321afaf18SBorislav Petkov a->show = show_bank; 259421afaf18SBorislav Petkov a->store = set_bank; 259521afaf18SBorislav Petkov } 259621afaf18SBorislav Petkov } 259721afaf18SBorislav Petkov 25986e7a41c6SThomas Gleixner /* 25996e7a41c6SThomas Gleixner * When running on XEN, this initcall is ordered against the XEN mcelog 26006e7a41c6SThomas Gleixner * initcall: 26016e7a41c6SThomas Gleixner * 26026e7a41c6SThomas Gleixner * device_initcall(xen_late_init_mcelog); 26036e7a41c6SThomas Gleixner * device_initcall_sync(mcheck_init_device); 26046e7a41c6SThomas Gleixner */ 260521afaf18SBorislav Petkov static __init int mcheck_init_device(void) 260621afaf18SBorislav Petkov { 260721afaf18SBorislav Petkov int err; 260821afaf18SBorislav Petkov 260921afaf18SBorislav Petkov /* 261021afaf18SBorislav Petkov * Check if we have a spare virtual bit. This will only become 261121afaf18SBorislav Petkov * a problem if/when we move beyond 5-level page tables. 261221afaf18SBorislav Petkov */ 261321afaf18SBorislav Petkov MAYBE_BUILD_BUG_ON(__VIRTUAL_MASK_SHIFT >= 63); 261421afaf18SBorislav Petkov 261521afaf18SBorislav Petkov if (!mce_available(&boot_cpu_data)) { 261621afaf18SBorislav Petkov err = -EIO; 261721afaf18SBorislav Petkov goto err_out; 261821afaf18SBorislav Petkov } 261921afaf18SBorislav Petkov 262021afaf18SBorislav Petkov if (!zalloc_cpumask_var(&mce_device_initialized, GFP_KERNEL)) { 262121afaf18SBorislav Petkov err = -ENOMEM; 262221afaf18SBorislav Petkov goto err_out; 262321afaf18SBorislav Petkov } 262421afaf18SBorislav Petkov 262521afaf18SBorislav Petkov mce_init_banks(); 262621afaf18SBorislav Petkov 262721afaf18SBorislav Petkov err = subsys_system_register(&mce_subsys, NULL); 262821afaf18SBorislav Petkov if (err) 262921afaf18SBorislav Petkov goto err_out_mem; 263021afaf18SBorislav Petkov 263121afaf18SBorislav Petkov err = cpuhp_setup_state(CPUHP_X86_MCE_DEAD, "x86/mce:dead", NULL, 263221afaf18SBorislav Petkov mce_cpu_dead); 263321afaf18SBorislav Petkov if (err) 263421afaf18SBorislav Petkov goto err_out_mem; 263521afaf18SBorislav Petkov 26366e7a41c6SThomas Gleixner /* 26376e7a41c6SThomas Gleixner * Invokes mce_cpu_online() on all CPUs which are online when 26386e7a41c6SThomas Gleixner * the state is installed. 26396e7a41c6SThomas Gleixner */ 264021afaf18SBorislav Petkov err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/mce:online", 264121afaf18SBorislav Petkov mce_cpu_online, mce_cpu_pre_down); 264221afaf18SBorislav Petkov if (err < 0) 264321afaf18SBorislav Petkov goto err_out_online; 264421afaf18SBorislav Petkov 264521afaf18SBorislav Petkov register_syscore_ops(&mce_syscore_ops); 264621afaf18SBorislav Petkov 264721afaf18SBorislav Petkov return 0; 264821afaf18SBorislav Petkov 264921afaf18SBorislav Petkov err_out_online: 265021afaf18SBorislav Petkov cpuhp_remove_state(CPUHP_X86_MCE_DEAD); 265121afaf18SBorislav Petkov 265221afaf18SBorislav Petkov err_out_mem: 265321afaf18SBorislav Petkov free_cpumask_var(mce_device_initialized); 265421afaf18SBorislav Petkov 265521afaf18SBorislav Petkov err_out: 265621afaf18SBorislav Petkov pr_err("Unable to init MCE device (rc: %d)\n", err); 265721afaf18SBorislav Petkov 265821afaf18SBorislav Petkov return err; 265921afaf18SBorislav Petkov } 266021afaf18SBorislav Petkov device_initcall_sync(mcheck_init_device); 266121afaf18SBorislav Petkov 266221afaf18SBorislav Petkov /* 266321afaf18SBorislav Petkov * Old style boot options parsing. Only for compatibility. 266421afaf18SBorislav Petkov */ 266521afaf18SBorislav Petkov static int __init mcheck_disable(char *str) 266621afaf18SBorislav Petkov { 266721afaf18SBorislav Petkov mca_cfg.disabled = 1; 266821afaf18SBorislav Petkov return 1; 266921afaf18SBorislav Petkov } 267021afaf18SBorislav Petkov __setup("nomce", mcheck_disable); 267121afaf18SBorislav Petkov 267221afaf18SBorislav Petkov #ifdef CONFIG_DEBUG_FS 267321afaf18SBorislav Petkov struct dentry *mce_get_debugfs_dir(void) 267421afaf18SBorislav Petkov { 267521afaf18SBorislav Petkov static struct dentry *dmce; 267621afaf18SBorislav Petkov 267721afaf18SBorislav Petkov if (!dmce) 267821afaf18SBorislav Petkov dmce = debugfs_create_dir("mce", NULL); 267921afaf18SBorislav Petkov 268021afaf18SBorislav Petkov return dmce; 268121afaf18SBorislav Petkov } 268221afaf18SBorislav Petkov 268321afaf18SBorislav Petkov static void mce_reset(void) 268421afaf18SBorislav Petkov { 268521afaf18SBorislav Petkov cpu_missing = 0; 268621afaf18SBorislav Petkov atomic_set(&mce_fake_panicked, 0); 268721afaf18SBorislav Petkov atomic_set(&mce_executing, 0); 268821afaf18SBorislav Petkov atomic_set(&mce_callin, 0); 268921afaf18SBorislav Petkov atomic_set(&global_nwo, 0); 269021afaf18SBorislav Petkov } 269121afaf18SBorislav Petkov 269221afaf18SBorislav Petkov static int fake_panic_get(void *data, u64 *val) 269321afaf18SBorislav Petkov { 269421afaf18SBorislav Petkov *val = fake_panic; 269521afaf18SBorislav Petkov return 0; 269621afaf18SBorislav Petkov } 269721afaf18SBorislav Petkov 269821afaf18SBorislav Petkov static int fake_panic_set(void *data, u64 val) 269921afaf18SBorislav Petkov { 270021afaf18SBorislav Petkov mce_reset(); 270121afaf18SBorislav Petkov fake_panic = val; 270221afaf18SBorislav Petkov return 0; 270321afaf18SBorislav Petkov } 270421afaf18SBorislav Petkov 270528156d76SYueHaibing DEFINE_DEBUGFS_ATTRIBUTE(fake_panic_fops, fake_panic_get, fake_panic_set, 270628156d76SYueHaibing "%llu\n"); 270721afaf18SBorislav Petkov 27086e4f929eSGreg Kroah-Hartman static void __init mcheck_debugfs_init(void) 270921afaf18SBorislav Petkov { 27106e4f929eSGreg Kroah-Hartman struct dentry *dmce; 271121afaf18SBorislav Petkov 271221afaf18SBorislav Petkov dmce = mce_get_debugfs_dir(); 27136e4f929eSGreg Kroah-Hartman debugfs_create_file_unsafe("fake_panic", 0444, dmce, NULL, 27146e4f929eSGreg Kroah-Hartman &fake_panic_fops); 271521afaf18SBorislav Petkov } 271621afaf18SBorislav Petkov #else 27176e4f929eSGreg Kroah-Hartman static void __init mcheck_debugfs_init(void) { } 271821afaf18SBorislav Petkov #endif 271921afaf18SBorislav Petkov 272021afaf18SBorislav Petkov DEFINE_STATIC_KEY_FALSE(mcsafe_key); 272121afaf18SBorislav Petkov EXPORT_SYMBOL_GPL(mcsafe_key); 272221afaf18SBorislav Petkov 272321afaf18SBorislav Petkov static int __init mcheck_late_init(void) 272421afaf18SBorislav Petkov { 272521afaf18SBorislav Petkov if (mca_cfg.recovery) 272621afaf18SBorislav Petkov static_branch_inc(&mcsafe_key); 272721afaf18SBorislav Petkov 272821afaf18SBorislav Petkov mcheck_debugfs_init(); 272921afaf18SBorislav Petkov 273021afaf18SBorislav Petkov /* 273121afaf18SBorislav Petkov * Flush out everything that has been logged during early boot, now that 273221afaf18SBorislav Petkov * everything has been initialized (workqueues, decoders, ...). 273321afaf18SBorislav Petkov */ 273421afaf18SBorislav Petkov mce_schedule_work(); 273521afaf18SBorislav Petkov 273621afaf18SBorislav Petkov return 0; 273721afaf18SBorislav Petkov } 273821afaf18SBorislav Petkov late_initcall(mcheck_late_init); 2739