From: Yazen Ghannam Date: Mon, 25 Mar 2019 16:34:22 +0000 (+0000) Subject: x86/MCE/AMD: Don't report L1 BTB MCA errors on some family 17h models X-Git-Tag: v5.4-rc1~1102^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=71a84402b93e5fbd8f817f40059c137e10171788;p=platform%2Fkernel%2Flinux-rpi.git x86/MCE/AMD: Don't report L1 BTB MCA errors on some family 17h models AMD family 17h Models 10h-2Fh may report a high number of L1 BTB MCA errors under certain conditions. The errors are benign and can safely be ignored. However, the high error rate may cause the MCA threshold counter to overflow causing a high rate of thresholding interrupts. In addition, users may see the errors reported through the AMD MCE decoder module, even with the interrupt disabled, due to MCA polling. Clear the "Counter Present" bit in the Instruction Fetch bank's MCA_MISC0 register. This will prevent enabling MCA thresholding on this bank which will prevent the high interrupt rate due to this error. Define an AMD-specific function to filter these errors from the MCE event pool so that they don't get reported during early boot. Rename filter function in EDAC/mce_amd to avoid a naming conflict, while at it. [ bp: Move function prototype to the internal header and massage/cleanup, fix typos. ] Reported-by: Rafał Miłecki Signed-off-by: Yazen Ghannam Signed-off-by: Borislav Petkov Cc: "H. Peter Anvin" Cc: "clemej@gmail.com" Cc: Arnd Bergmann Cc: Ingo Molnar Cc: James Morse Cc: Kees Cook Cc: Mauro Carvalho Chehab Cc: Pu Wen Cc: Qiuxu Zhuo Cc: Shirish S Cc: Thomas Gleixner Cc: Tony Luck Cc: Vishal Verma Cc: linux-edac Cc: x86-ml Cc: # 5.0.x: c95b323dcd35: x86/MCE/AMD: Turn off MC4_MISC thresholding on all family 0x15 models Cc: # 5.0.x: 30aa3d26edb0: x86/MCE/AMD: Carve out the MC4_MISC thresholding quirk Cc: # 5.0.x: 9308fd407455: x86/MCE: Group AMD function prototypes in Cc: # 5.0.x Link: https://lkml.kernel.org/r/20190325163410.171021-2-Yazen.Ghannam@amd.com --- diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c index e64de51..d904aaf 100644 --- a/arch/x86/kernel/cpu/mce/amd.c +++ b/arch/x86/kernel/cpu/mce/amd.c @@ -563,33 +563,59 @@ out: return offset; } +bool amd_filter_mce(struct mce *m) +{ + enum smca_bank_types bank_type = smca_get_bank_type(m->bank); + struct cpuinfo_x86 *c = &boot_cpu_data; + u8 xec = (m->status >> 16) & 0x3F; + + /* See Family 17h Models 10h-2Fh Erratum #1114. */ + if (c->x86 == 0x17 && + c->x86_model >= 0x10 && c->x86_model <= 0x2F && + bank_type == SMCA_IF && xec == 10) + return true; + + return false; +} + /* - * Turn off MC4_MISC thresholding banks on all family 0x15 models since - * they're not supported there. + * Turn off thresholding banks for the following conditions: + * - MC4_MISC thresholding is not supported on Family 0x15. + * - Prevent possible spurious interrupts from the IF bank on Family 0x17 + * Models 0x10-0x2F due to Erratum #1114. */ -void disable_err_thresholding(struct cpuinfo_x86 *c) +void disable_err_thresholding(struct cpuinfo_x86 *c, unsigned int bank) { - int i; + int i, num_msrs; u64 hwcr; bool need_toggle; - u32 msrs[] = { - 0x00000413, /* MC4_MISC0 */ - 0xc0000408, /* MC4_MISC1 */ - }; + u32 msrs[NR_BLOCKS]; + + if (c->x86 == 0x15 && bank == 4) { + msrs[0] = 0x00000413; /* MC4_MISC0 */ + msrs[1] = 0xc0000408; /* MC4_MISC1 */ + num_msrs = 2; + } else if (c->x86 == 0x17 && + (c->x86_model >= 0x10 && c->x86_model <= 0x2F)) { - if (c->x86 != 0x15) + if (smca_get_bank_type(bank) != SMCA_IF) + return; + + msrs[0] = MSR_AMD64_SMCA_MCx_MISC(bank); + num_msrs = 1; + } else { return; + } rdmsrl(MSR_K7_HWCR, hwcr); /* McStatusWrEn has to be set */ need_toggle = !(hwcr & BIT(18)); - if (need_toggle) wrmsrl(MSR_K7_HWCR, hwcr | BIT(18)); /* Clear CntP bit safely */ - for (i = 0; i < ARRAY_SIZE(msrs); i++) + for (i = 0; i < num_msrs; i++) msr_clear_bit(msrs[i], 62); /* restore old settings */ @@ -604,12 +630,12 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c) unsigned int bank, block, cpu = smp_processor_id(); int offset = -1; - disable_err_thresholding(c); - for (bank = 0; bank < mca_cfg.banks; ++bank) { if (mce_flags.smca) smca_configure(bank, cpu); + disable_err_thresholding(c, bank); + for (block = 0; block < NR_BLOCKS; ++block) { address = get_block_address(address, low, high, bank, block); if (!address) diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c index 80b8c6bf..5112a50 100644 --- a/arch/x86/kernel/cpu/mce/core.c +++ b/arch/x86/kernel/cpu/mce/core.c @@ -1777,6 +1777,9 @@ static void __mcheck_cpu_init_timer(void) bool filter_mce(struct mce *m) { + if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) + return amd_filter_mce(m); + return false; } diff --git a/arch/x86/kernel/cpu/mce/internal.h b/arch/x86/kernel/cpu/mce/internal.h index b822a64..a34b55b 100644 --- a/arch/x86/kernel/cpu/mce/internal.h +++ b/arch/x86/kernel/cpu/mce/internal.h @@ -176,4 +176,10 @@ extern struct mca_msr_regs msr_ops; /* Decide whether to add MCE record to MCE event pool or filter it out. */ extern bool filter_mce(struct mce *m); +#ifdef CONFIG_X86_MCE_AMD +extern bool amd_filter_mce(struct mce *m); +#else +static inline bool amd_filter_mce(struct mce *m) { return false; }; +#endif + #endif /* __X86_MCE_INTERNAL_H__ */ diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c index 0a1814d..bb0202a 100644 --- a/drivers/edac/mce_amd.c +++ b/drivers/edac/mce_amd.c @@ -1004,7 +1004,7 @@ static inline void amd_decode_err_code(u16 ec) /* * Filter out unwanted MCE signatures here. */ -static bool amd_filter_mce(struct mce *m) +static bool ignore_mce(struct mce *m) { /* * NB GART TLB error reporting is disabled by default. @@ -1038,7 +1038,7 @@ amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data) unsigned int fam = x86_family(m->cpuid); int ecc; - if (amd_filter_mce(m)) + if (ignore_mce(m)) return NOTIFY_STOP; pr_emerg(HW_ERR "%s\n", decode_error_status(m));