Messages in this thread Patch in this message | | | Date | Tue, 17 May 2005 21:18:29 +0100 (BST) | From | Hugh Dickins <> | Subject | [PATCH -mm] x86 port lockless MCE quirky bank0 |
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I've been avoiding -mm on the Dell Latitude with PIII Mobile for several weeks now, since APM resume from RAM locks up. Just stole time to bisect and it's the x86-port-lockless-mce patches, which lack some of the wisdom of ages handed down in the earlier MCE source.
The "Don't enable bank 0 on Intel P6 cores, it goes bang quickly" fix from the old mcheck/p6.c solves my PIII problem; but looking further, the old mcheck/k7.c says some Athlons also have a problem with bank 0.
So try to handle them both together: but this code is an amalgam of what was done slightly differently in the two cases, diverging from each - I don't want to add voodoo if it's unnecessary; and untested on AMD.
Worry: has more such wisdom got lost in the translation?
Signed-off-by: Hugh Dickins <hugh@veritas.com>
--- 2.6.12-rc4-mm2/arch/i386/kernel/cpu/mcheck/mce.c 2005-05-16 12:18:35.000000000 +0100 +++ linux/arch/i386/kernel/cpu/mcheck/mce.c 2005-05-17 20:21:17.000000000 +0100 @@ -30,7 +30,7 @@ int __devinitdata mce_dont_init = 0; /* 0: always panic, 1: panic if deadlock possible, 2: try to avoid panic, 3: never panic or exit (for testing only) */ static unsigned long tolerant = 1; -static int banks; +static int banks, quirky_bank0; static unsigned long bank[NR_BANKS] = { [0 ... NR_BANKS-1] = ~0UL }; static unsigned long console_logged; static int notify_user; @@ -320,7 +320,8 @@ static void mce_init(void *dummy) wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff); for (i = 0; i < banks; i++) { - wrmsrl(MSR_IA32_MC0_CTL+4*i, bank[i]); + if (i >= quirky_bank0) + wrmsrl(MSR_IA32_MC0_CTL+4*i, bank[i]); wrmsrl(MSR_IA32_MC0_STATUS+4*i, 0); } } @@ -334,6 +335,14 @@ static void __devinit mce_cpu_quirks(str incorrectly with the IOMMU & 3ware & Cerberus. */ clear_bit(10, &bank[4]); } + if ((c->x86_vendor == X86_VENDOR_AMD || + c->x86_vendor == X86_VENDOR_INTEL) && c->x86 == 6) { + /* + * Intel P6 cores go bang quickly when bank0 is enabled. + * Some Athlons cause spurious MCEs when bank0 is enabled. + */ + quirky_bank0 = 1; + } } static void __devinit mce_cpu_features(struct cpuinfo_x86 *c) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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