| Message ID | 20200828203332.11129-2-Smita.KoralahalliChannabasappa@amd.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Decode raw MSR values of MCA registers in BERT | expand |
Hi Smita, A couple of comments below - Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> writes: > Linux Kernel uses ACPI Boot Error Record Table (BERT) to report fatal > errors that occurred in a previous boot. The MCA errors in the BERT are > reported using the x86 Processor Error Common Platform Error Record (CPER) > format. Currently, the record prints out the raw MSR values and AMD relies > on the raw record to provide MCA information. > > Extract the raw MSR values of MCA registers from the BERT and feed it into > the standard mce_log() function through the existing x86/MCA RAS > infrastructure. This will result in better decoding from the EDAC MCE > decoder or the default notifier. > > The implementation is SMCA specific as the raw MCA register values are > given in the register offset order of the MCAX address space. > > Reported-by: kernel test robot <lkp@intel.com> > Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> > --- [...] > diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-x86.c > index 2531de49f56c..374b8e18552a 100644 > --- a/drivers/firmware/efi/cper-x86.c > +++ b/drivers/firmware/efi/cper-x86.c > @@ -1,7 +1,7 @@ > // SPDX-License-Identifier: GPL-2.0 > // Copyright (C) 2018, Advanced Micro Devices, Inc. > > -#include <linux/cper.h> Why is the include dropped? AFAICT, the definitions from there are still being used after this patch. > +#include <acpi/apei.h> > > /* > * We don't need a "CPER_IA" prefix since these are all locally defined. > @@ -347,9 +347,11 @@ void cper_print_proc_ia(const char *pfx, const struct cper_sec_proc_ia *proc) > ctx_info->mm_reg_addr); > } > > - printk("%sRegister Array:\n", newpfx); > - print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, groupsize, > - (ctx_info + 1), ctx_info->reg_arr_size, 0); > + if (arch_apei_report_x86_error(ctx_info, proc->lapic_id)) { > + printk("%sRegister Array:\n", newpfx); > + print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, groupsize, > + (ctx_info + 1), ctx_info->reg_arr_size, 0); > + } > > ctx_info = (struct cper_ia_proc_ctx *)((long)ctx_info + size); > } > diff --git a/include/acpi/apei.h b/include/acpi/apei.h > index 680f80960c3d..44d4d08acce0 100644 > --- a/include/acpi/apei.h > +++ b/include/acpi/apei.h > @@ -33,8 +33,15 @@ extern bool ghes_disable; > > #ifdef CONFIG_ACPI_APEI > void __init acpi_hest_init(void); > +int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, > + u64 lapic_id); > #else > static inline void acpi_hest_init(void) { return; } > +static inline int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, > + u64 lapic_id) > +{ > + return -EINVAL; > +} > #endif Adding the declaration to this include violates the separation of generic and architecture specific code. Can this be moved to the appropriate architecture specific header? Perhaps arch/x86/include/asm/apei.h. > typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data); > @@ -51,6 +58,8 @@ int erst_clear(u64 record_id); > > int arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, void *data); > void arch_apei_report_mem_error(int sev, struct cper_sec_mem_err *mem_err); > +int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, > + u64 lapic_id); Why is the additional declaration needed? Thanks, Punit > > #endif > #endif
On Fri, Aug 28, 2020 at 03:33:31PM -0500, Smita Koralahalli wrote: ... > +int apei_mce_report_x86_error(struct cper_ia_proc_ctx *ctx_info, u64 lapic_id) > +{ > + const u64 *i_mce = ((const void *) (ctx_info + 1)); > + unsigned int cpu; > + struct mce m; > + > + if (!boot_cpu_has(X86_FEATURE_SMCA)) > + return -EINVAL; > + This function is called on any context type, but it can only decode "MSR" types that follow the MCAX register layout used on Scalable MCA systems. So I think there should be a couple of checks added: 1) Context type is "MSR". 2) Register layout follows what is expected below. There's no explict way to do this, since the data is implemenation-specific. But at least there can be a check that the starting MSR address matches the first expected register: Bank's MCA_STATUS in MCAX space (0xC0002XX1). For example: (ctx_info->msr_addr & 0xC0002001) == 0xC0002001 The raw value in the example should be defined with a name. > + mce_setup(&m); > + > + m.extcpu = -1; > + m.socketid = -1; > + > + for_each_possible_cpu(cpu) { > + if (cpu_data(cpu).initial_apicid == lapic_id) { > + m.extcpu = cpu; > + m.socketid = cpu_data(m.extcpu).phys_proc_id; > + break; > + } > + } > + > + m.apicid = lapic_id; > + m.bank = (ctx_info->msr_addr >> 4) & 0xFF; > + m.status = *i_mce; > + m.addr = *(i_mce + 1); > + m.misc = *(i_mce + 2); > + /* Skipping MCA_CONFIG */ > + m.ipid = *(i_mce + 4); > + m.synd = *(i_mce + 5); > + > + mce_log(&m); > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(apei_mce_report_x86_error); > + Thanks, Yazen
On 8/31/20 12:05 AM, Punit Agrawal wrote: > Hi Smita, > > A couple of comments below - > > Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> writes: > > [...] > > >> diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-x86.c >> index 2531de49f56c..374b8e18552a 100644 >> --- a/drivers/firmware/efi/cper-x86.c >> +++ b/drivers/firmware/efi/cper-x86.c >> @@ -1,7 +1,7 @@ >> // SPDX-License-Identifier: GPL-2.0 >> // Copyright (C) 2018, Advanced Micro Devices, Inc. >> >> -#include <linux/cper.h> > Why is the include dropped? AFAICT, the definitions from there are still > being used after this patch. Dropped because <acpi/apei.h> already includes <linux/cper.h> >> +#include <acpi/apei.h> [...] >> diff --git a/include/acpi/apei.h b/include/acpi/apei.h >> index 680f80960c3d..44d4d08acce0 100644 >> --- a/include/acpi/apei.h >> +++ b/include/acpi/apei.h >> @@ -33,8 +33,15 @@ extern bool ghes_disable; >> >> #ifdef CONFIG_ACPI_APEI >> void __init acpi_hest_init(void); >> +int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, >> + u64 lapic_id); >> #else >> static inline void acpi_hest_init(void) { return; } >> +static inline int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, >> + u64 lapic_id) >> +{ >> + return -EINVAL; >> +} >> #endif > Adding the declaration to this include violates the separation of > generic and architecture specific code. > > Can this be moved to the appropriate architecture specific header? > Perhaps arch/x86/include/asm/apei.h. Yes, I have fixed this and moved into arch/x86/include/asm/acpi.h. >> typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data); >> @@ -51,6 +58,8 @@ int erst_clear(u64 record_id); >> >> int arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, void *data); >> void arch_apei_report_mem_error(int sev, struct cper_sec_mem_err *mem_err); >> +int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, >> + u64 lapic_id); > > Why is the additional declaration needed? Will fix in the next revision. Thanks, Smita [...]
Hi Smita, Smita Koralahalli Channabasappa <skoralah@amd.com> writes: > On 8/31/20 12:05 AM, Punit Agrawal wrote: > >> Hi Smita, >> >> A couple of comments below - >> >> Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> writes: >> >> [...] >> >> >>> diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-x86.c >>> index 2531de49f56c..374b8e18552a 100644 >>> --- a/drivers/firmware/efi/cper-x86.c >>> +++ b/drivers/firmware/efi/cper-x86.c >>> @@ -1,7 +1,7 @@ >>> // SPDX-License-Identifier: GPL-2.0 >>> // Copyright (C) 2018, Advanced Micro Devices, Inc. >>> -#include <linux/cper.h> >> Why is the include dropped? AFAICT, the definitions from there are still >> being used after this patch. > > Dropped because <acpi/apei.h> already includes <linux/cper.h> Generally, you want to follow the rule that if a declaration from a header file is being used, it should show up in the includes. The same applies to both source as well as header files. It doesn't matter if another include in the source file in turn ends up including the same header again; the #ifdef guards are there to prevent duplicate declarations. The rationale is that if future changes remove the usage of <acpi/apei.h>, the C file can still be compiled after dropping the include; there should be no need to then re-introduce <linux/cper.h> at that point. Hope that makes sense. Thanks, Punit >>> +#include <acpi/apei.h> > > [...] > >>> diff --git a/include/acpi/apei.h b/include/acpi/apei.h >>> index 680f80960c3d..44d4d08acce0 100644 >>> --- a/include/acpi/apei.h >>> +++ b/include/acpi/apei.h >>> @@ -33,8 +33,15 @@ extern bool ghes_disable; >>> #ifdef CONFIG_ACPI_APEI >>> void __init acpi_hest_init(void); >>> +int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, >>> + u64 lapic_id); >>> #else >>> static inline void acpi_hest_init(void) { return; } >>> +static inline int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, >>> + u64 lapic_id) >>> +{ >>> + return -EINVAL; >>> +} >>> #endif >> Adding the declaration to this include violates the separation of >> generic and architecture specific code. >> >> Can this be moved to the appropriate architecture specific header? >> Perhaps arch/x86/include/asm/apei.h. > > Yes, I have fixed this and moved into arch/x86/include/asm/acpi.h. > >>> typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data); >>> @@ -51,6 +58,8 @@ int erst_clear(u64 record_id); >>> int arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, >>> void *data); >>> void arch_apei_report_mem_error(int sev, struct cper_sec_mem_err *mem_err); >>> +int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, >>> + u64 lapic_id); >> >> Why is the additional declaration needed? > > Will fix in the next revision. > > Thanks, > Smita > > [...]
On Thu, 3 Sep 2020 at 09:34, Punit Agrawal <punit1.agrawal@toshiba.co.jp> wrote: > > Hi Smita, > > Smita Koralahalli Channabasappa <skoralah@amd.com> writes: > > > On 8/31/20 12:05 AM, Punit Agrawal wrote: > > > >> Hi Smita, > >> > >> A couple of comments below - > >> > >> Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> writes: > >> > >> [...] > >> > >> > >>> diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-x86.c > >>> index 2531de49f56c..374b8e18552a 100644 > >>> --- a/drivers/firmware/efi/cper-x86.c > >>> +++ b/drivers/firmware/efi/cper-x86.c > >>> @@ -1,7 +1,7 @@ > >>> // SPDX-License-Identifier: GPL-2.0 > >>> // Copyright (C) 2018, Advanced Micro Devices, Inc. > >>> -#include <linux/cper.h> > >> Why is the include dropped? AFAICT, the definitions from there are still > >> being used after this patch. > > > > Dropped because <acpi/apei.h> already includes <linux/cper.h> > > Generally, you want to follow the rule that if a declaration from a > header file is being used, it should show up in the includes. The same > applies to both source as well as header files. > > It doesn't matter if another include in the source file in turn ends up > including the same header again; the #ifdef guards are there to prevent > duplicate declarations. > > The rationale is that if future changes remove the usage of > <acpi/apei.h>, the C file can still be compiled after dropping the > include; there should be no need to then re-introduce <linux/cper.h> at > that point. > > Hope that makes sense. > Agreed. If the code still uses declarations from linux/cper.h after the patch, the #include should remain.
On 9/11/20 1:23 PM, Ard Biesheuvel wrote: > On Thu, 3 Sep 2020 at 09:34, Punit Agrawal <punit1.agrawal@toshiba.co.jp> wrote: >> Hi Smita, >> >> Smita Koralahalli Channabasappa <skoralah@amd.com> writes: >> >>> On 8/31/20 12:05 AM, Punit Agrawal wrote: >>> >>>> Hi Smita, >>>> >>>> A couple of comments below - >>>> >>>> Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> writes: >>>> >>>> [...] >>>> >>>> >>>>> diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-x86.c >>>>> index 2531de49f56c..374b8e18552a 100644 >>>>> --- a/drivers/firmware/efi/cper-x86.c >>>>> +++ b/drivers/firmware/efi/cper-x86.c >>>>> @@ -1,7 +1,7 @@ >>>>> // SPDX-License-Identifier: GPL-2.0 >>>>> // Copyright (C) 2018, Advanced Micro Devices, Inc. >>>>> -#include <linux/cper.h> >>>> Why is the include dropped? AFAICT, the definitions from there are still >>>> being used after this patch. >>> Dropped because <acpi/apei.h> already includes <linux/cper.h> >> Generally, you want to follow the rule that if a declaration from a >> header file is being used, it should show up in the includes. The same >> applies to both source as well as header files. >> >> It doesn't matter if another include in the source file in turn ends up >> including the same header again; the #ifdef guards are there to prevent >> duplicate declarations. >> >> The rationale is that if future changes remove the usage of >> <acpi/apei.h>, the C file can still be compiled after dropping the >> include; there should be no need to then re-introduce <linux/cper.h> at >> that point. >> >> Hope that makes sense. >> > Agreed. If the code still uses declarations from linux/cper.h after > the patch, the #include should remain. Thanks, I have taken care of the comments and sent out the next revision now. https://lkml.kernel.org/r/20200903234531.162484-2-Smita.KoralahalliChannabasappa@amd.com. Please ignore my previous email. Thanks, Smita
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h index cf503824529c..139a89945225 100644 --- a/arch/x86/include/asm/mce.h +++ b/arch/x86/include/asm/mce.h @@ -291,6 +291,9 @@ struct cper_sec_mem_err; extern void apei_mce_report_mem_error(int corrected, struct cper_sec_mem_err *mem_err); +struct cper_ia_proc_ctx; +int apei_mce_report_x86_error(struct cper_ia_proc_ctx *ctx_info, u64 lapic_id); + /* * Enumerate new IP types and HWID values in AMD processors which support * Scalable MCA. diff --git a/arch/x86/kernel/acpi/apei.c b/arch/x86/kernel/acpi/apei.c index c22fb55abcfd..13d60a91eaa0 100644 --- a/arch/x86/kernel/acpi/apei.c +++ b/arch/x86/kernel/acpi/apei.c @@ -43,3 +43,12 @@ void arch_apei_report_mem_error(int sev, struct cper_sec_mem_err *mem_err) apei_mce_report_mem_error(sev, mem_err); #endif } + +int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, u64 lapic_id) +{ + int err = -EINVAL; +#ifdef CONFIG_X86_MCE + err = apei_mce_report_x86_error(ctx_info, lapic_id); +#endif + return err; +} diff --git a/arch/x86/kernel/cpu/mce/apei.c b/arch/x86/kernel/cpu/mce/apei.c index af8d37962586..836bd9296116 100644 --- a/arch/x86/kernel/cpu/mce/apei.c +++ b/arch/x86/kernel/cpu/mce/apei.c @@ -51,6 +51,43 @@ void apei_mce_report_mem_error(int severity, struct cper_sec_mem_err *mem_err) } EXPORT_SYMBOL_GPL(apei_mce_report_mem_error); +int apei_mce_report_x86_error(struct cper_ia_proc_ctx *ctx_info, u64 lapic_id) +{ + const u64 *i_mce = ((const void *) (ctx_info + 1)); + unsigned int cpu; + struct mce m; + + if (!boot_cpu_has(X86_FEATURE_SMCA)) + return -EINVAL; + + mce_setup(&m); + + m.extcpu = -1; + m.socketid = -1; + + for_each_possible_cpu(cpu) { + if (cpu_data(cpu).initial_apicid == lapic_id) { + m.extcpu = cpu; + m.socketid = cpu_data(m.extcpu).phys_proc_id; + break; + } + } + + m.apicid = lapic_id; + m.bank = (ctx_info->msr_addr >> 4) & 0xFF; + m.status = *i_mce; + m.addr = *(i_mce + 1); + m.misc = *(i_mce + 2); + /* Skipping MCA_CONFIG */ + m.ipid = *(i_mce + 4); + m.synd = *(i_mce + 5); + + mce_log(&m); + + return 0; +} +EXPORT_SYMBOL_GPL(apei_mce_report_x86_error); + #define CPER_CREATOR_MCE \ GUID_INIT(0x75a574e3, 0x5052, 0x4b29, 0x8a, 0x8e, 0xbe, 0x2c, \ 0x64, 0x90, 0xb8, 0x9d) diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-x86.c index 2531de49f56c..374b8e18552a 100644 --- a/drivers/firmware/efi/cper-x86.c +++ b/drivers/firmware/efi/cper-x86.c @@ -1,7 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018, Advanced Micro Devices, Inc. -#include <linux/cper.h> +#include <acpi/apei.h> /* * We don't need a "CPER_IA" prefix since these are all locally defined. @@ -347,9 +347,11 @@ void cper_print_proc_ia(const char *pfx, const struct cper_sec_proc_ia *proc) ctx_info->mm_reg_addr); } - printk("%sRegister Array:\n", newpfx); - print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, groupsize, - (ctx_info + 1), ctx_info->reg_arr_size, 0); + if (arch_apei_report_x86_error(ctx_info, proc->lapic_id)) { + printk("%sRegister Array:\n", newpfx); + print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, groupsize, + (ctx_info + 1), ctx_info->reg_arr_size, 0); + } ctx_info = (struct cper_ia_proc_ctx *)((long)ctx_info + size); } diff --git a/include/acpi/apei.h b/include/acpi/apei.h index 680f80960c3d..44d4d08acce0 100644 --- a/include/acpi/apei.h +++ b/include/acpi/apei.h @@ -33,8 +33,15 @@ extern bool ghes_disable; #ifdef CONFIG_ACPI_APEI void __init acpi_hest_init(void); +int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, + u64 lapic_id); #else static inline void acpi_hest_init(void) { return; } +static inline int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, + u64 lapic_id) +{ + return -EINVAL; +} #endif typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data); @@ -51,6 +58,8 @@ int erst_clear(u64 record_id); int arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, void *data); void arch_apei_report_mem_error(int sev, struct cper_sec_mem_err *mem_err); +int arch_apei_report_x86_error(struct cper_ia_proc_ctx *ctx_info, + u64 lapic_id); #endif #endif
Linux Kernel uses ACPI Boot Error Record Table (BERT) to report fatal errors that occurred in a previous boot. The MCA errors in the BERT are reported using the x86 Processor Error Common Platform Error Record (CPER) format. Currently, the record prints out the raw MSR values and AMD relies on the raw record to provide MCA information. Extract the raw MSR values of MCA registers from the BERT and feed it into the standard mce_log() function through the existing x86/MCA RAS infrastructure. This will result in better decoding from the EDAC MCE decoder or the default notifier. The implementation is SMCA specific as the raw MCA register values are given in the register offset order of the MCAX address space. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> --- v2: Fixed build error reported by kernel test robot. Passed struct variable as function argument instead of entire struct arch/x86/include/asm/mce.h | 3 +++ arch/x86/kernel/acpi/apei.c | 9 ++++++++ arch/x86/kernel/cpu/mce/apei.c | 37 +++++++++++++++++++++++++++++++++ drivers/firmware/efi/cper-x86.c | 10 +++++---- include/acpi/apei.h | 9 ++++++++ 5 files changed, 64 insertions(+), 4 deletions(-)