Messages in this thread Patch in this message | | | Date | Thu, 1 Oct 2009 16:14:32 +0200 | From | Borislav Petkov <> | Subject | Re: x86: mce: Please revert 22223c9b417be5fd0ab2cf9ad17eb7bd1e19f7b9 |
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On Thu, Oct 01, 2009 at 01:09:47AM +0200, Ingo Molnar wrote: > > * Borislav Petkov <petkovbb@googlemail.com> wrote: > > > On Wed, Sep 30, 2009 at 11:48:59PM +0200, Ingo Molnar wrote: > > > I.e. something like the patch below. Completely untested.
Ok, here it is, tested on two Fam10 machines here with injecting MCEs. The decoding code is now built-in by default (early_initcall requires !MODULE).
I dunno, it looks like we could just as well move the decoding stuff to <arch/x86/kernel/cpu/mcheck/> since its now built-in and doesn't have any connection to EDAC except the NB decoder which is a function ptr registration thing.
Please take a look and let me know if there are any objections.
Thanks.
--- From 2c494ebc4ddbdb386a3ffa1a30339d3cec4072e5 Mon Sep 17 00:00:00 2001 From: Ingo Molnar <mingo@elte.hu> Date: Thu, 1 Oct 2009 11:43:48 +0200 Subject: [PATCH] x86, mce: Fix MCE decoding callback logic
Make decoding of MCEs happen only on AMD hardware by registering a non-default callback only on CPU families which support it.
While looking at the interaction of decode_mce() with the other MCE code i also noticed a few other things and made the following cleanups/fixes:
- Fixed the mce_decode() weak alias - a weak alias is really not good here, it should be a proper callback. A weak alias will be overriden if a piece of code is built into the kernel - not good, obviously.
- The patch initializes the callback on AMD family 10h and 11h - a quick glance suggests that decoding of earlier models isnt supported?
- Added the more correct fallback printk of:
No support for human readable MCE decoding on this CPU type. Transcribe the message and run it through 'mcelog --ascii' to decode.
On CPUs that dont have a decoder.
- Made the surrounding code more readable.
Note that the callback allows us to have a default fallback - without having to check the CPU versions during the printout itself. When an EDAC module registers itself, it can install the decode-print function.
(there's no unregister needed as this is core code.)
Borislav:
- add K8 to the set of supported CPUs
- always build in edac_mce_amd since we use an early_initcall now
- fixup checkpatch warnings
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> --- arch/x86/include/asm/mce.h | 2 + arch/x86/kernel/cpu/mcheck/mce.c | 49 ++++++++++++++++++++++++-------------- drivers/edac/Makefile | 4 +-- drivers/edac/edac_mce_amd.c | 15 +++++++++++- 4 files changed, 48 insertions(+), 22 deletions(-)
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h index b608a64..f1363b7 100644 --- a/arch/x86/include/asm/mce.h +++ b/arch/x86/include/asm/mce.h @@ -133,6 +133,8 @@ static inline void winchip_mcheck_init(struct cpuinfo_x86 *c) {} static inline void enable_p5_mce(void) {} #endif +extern void (*x86_mce_decode_callback)(struct mce *m); + void mce_setup(struct mce *m); void mce_log(struct mce *m); DECLARE_PER_CPU(struct sys_device, mce_dev); diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c index 183c345..614c849 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -85,6 +85,18 @@ static DECLARE_WAIT_QUEUE_HEAD(mce_wait); static DEFINE_PER_CPU(struct mce, mces_seen); static int cpu_missing; +static void default_decode_mce(struct mce *m) +{ + pr_emerg("No human readable MCE decoding support on this CPU type.\n"); + pr_emerg("Run the message through 'mcelog --ascii' to decode.\n"); +} + +/* + * CPU/chipset specific EDAC code can register a callback here to print + * MCE errors in a human-readable form: + */ +void (*x86_mce_decode_callback)(struct mce *m) = default_decode_mce; +EXPORT_SYMBOL(x86_mce_decode_callback); /* MCA banks polled by the period polling timer for corrected events */ DEFINE_PER_CPU(mce_banks_t, mce_poll_banks) = { @@ -165,46 +177,47 @@ void mce_log(struct mce *mce) set_bit(0, &mce_need_notify); } -void __weak decode_mce(struct mce *m) -{ - return; -} - static void print_mce(struct mce *m) { - printk(KERN_EMERG - "CPU %d: Machine Check Exception: %16Lx Bank %d: %016Lx\n", + pr_emerg("CPU %d: Machine Check Exception: %16Lx Bank %d: %016Lx\n", m->extcpu, m->mcgstatus, m->bank, m->status); + if (m->ip) { - printk(KERN_EMERG "RIP%s %02x:<%016Lx> ", + pr_emerg("RIP%s %02x:<%016Lx> ", !(m->mcgstatus & MCG_STATUS_EIPV) ? " !INEXACT!" : "", m->cs, m->ip); + if (m->cs == __KERNEL_CS) print_symbol("{%s}", m->ip); - printk(KERN_CONT "\n"); + pr_cont("\n"); } - printk(KERN_EMERG "TSC %llx ", m->tsc); + + pr_emerg("TSC %llx ", m->tsc); if (m->addr) - printk(KERN_CONT "ADDR %llx ", m->addr); + pr_cont("ADDR %llx ", m->addr); if (m->misc) - printk(KERN_CONT "MISC %llx ", m->misc); - printk(KERN_CONT "\n"); - printk(KERN_EMERG "PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x\n", + pr_cont("MISC %llx ", m->misc); + + pr_cont("\n"); + pr_emerg("PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x\n", m->cpuvendor, m->cpuid, m->time, m->socketid, m->apicid); - decode_mce(m); + /* + * Print out human-readable details about the MCE error, + * (if the CPU has an implementation for that): + */ + x86_mce_decode_callback(m); } static void print_mce_head(void) { - printk(KERN_EMERG "\nHARDWARE ERROR\n"); + pr_emerg("\nHARDWARE ERROR\n"); } static void print_mce_tail(void) { - printk(KERN_EMERG "This is not a software problem!\n" - "Run through mcelog --ascii to decode and contact your hardware vendor\n"); + pr_emerg("This is not a software problem!\n"); } #define PANIC_TIMEOUT 5 /* 5 seconds */ diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile index 7a473bb..74fc527 100644 --- a/drivers/edac/Makefile +++ b/drivers/edac/Makefile @@ -17,9 +17,7 @@ ifdef CONFIG_PCI edac_core-objs += edac_pci.o edac_pci_sysfs.o endif -ifdef CONFIG_CPU_SUP_AMD -edac_core-objs += edac_mce_amd.o -endif +obj-$(CONFIG_CPU_SUP_AMD) += edac_mce_amd.o obj-$(CONFIG_EDAC_AMD76X) += amd76x_edac.o obj-$(CONFIG_EDAC_CPC925) += cpc925_edac.o diff --git a/drivers/edac/edac_mce_amd.c b/drivers/edac/edac_mce_amd.c index 0c21c37..83a01a1 100644 --- a/drivers/edac/edac_mce_amd.c +++ b/drivers/edac/edac_mce_amd.c @@ -362,7 +362,7 @@ static inline void amd_decode_err_code(unsigned int ec) pr_warning("Huh? Unknown MCE error 0x%x\n", ec); } -void decode_mce(struct mce *m) +static void amd_decode_mce(struct mce *m) { struct err_regs regs; int node, ecc; @@ -420,3 +420,16 @@ void decode_mce(struct mce *m) amd_decode_err_code(m->status & 0xffff); } + +static int __init mce_amd_init(void) +{ + /* + * We can decode MCEs for Opteron and later CPUs: + */ + if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) && + (boot_cpu_data.x86 >= 0xf)) + x86_mce_decode_callback = amd_decode_mce; + + return 0; +} +early_initcall(mce_amd_init); -- 1.6.4.3 -- Regards/Gruss, Boris.
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