Commit-ID: 66ef269dbbe45e264ccf7146d5db32b04478d148 Gitweb: http://git.kernel.org/tip/66ef269dbbe45e264ccf7146d5db32b04478d148 Author: Yazen Ghannam <Yazen.Ghannam@xxxxxxx> AuthorDate: Mon, 12 Sep 2016 09:59:36 +0200 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Tue, 13 Sep 2016 15:23:11 +0200 x86/mce/AMD: Ensure the deferred error interrupt is of type APIC on SMCA systems The Deferred Error Interrupt Type is set per bank on Scalable MCA systems. This is done in a bitfield in the MCA_CONFIG register of each bank. We should set its type to APIC-based interrupt and not assume BIOS has set it for us. Signed-off-by: Yazen Ghannam <Yazen.Ghannam@xxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Link: http://lkml.kernel.org/r/1472737486-1720-1-git-send-email-Yazen.Ghannam@xxxxxxx Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> --- arch/x86/kernel/cpu/mcheck/mce_amd.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c index 0f9d078..16766e0 100644 --- a/arch/x86/kernel/cpu/mcheck/mce_amd.c +++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c @@ -463,6 +463,20 @@ prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr, */ smca_high &= ~BIT(2); + /* + * SMCA sets the Deferred Error Interrupt type per bank. + * + * MCA_CONFIG[DeferredIntTypeSupported] is bit 5, and tells us + * if the DeferredIntType bit field is available. + * + * MCA_CONFIG[DeferredIntType] is bits [38:37] ([6:5] in the + * high portion of the MSR). OS should set this to 0x1 to enable + * APIC based interrupt. First, check that no interrupt has been + * set. + */ + if ((smca_low & BIT(5)) && !((smca_high >> 5) & 0x3)) + smca_high |= BIT(5); + wrmsr(smca_addr, smca_low, smca_high); } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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