Commit-ID: f57a1f3c14b9182f1fea667f5a38a1094699db7c Gitweb: http://git.kernel.org/tip/f57a1f3c14b9182f1fea667f5a38a1094699db7c Author: Aravind Gopalakrishnan <[email protected]> AuthorDate: Mon, 25 Jan 2016 20:41:51 +0100 Committer: Ingo Molnar <[email protected]> CommitDate: Mon, 1 Feb 2016 10:53:57 +0100
x86/mce/AMD: Fix LVT offset configuration for thresholding For processor families with the Scalable MCA feature, the LVT offset for threshold interrupts is configured only in MSR 0xC0000410 and not in each per bank MISC register as was done in earlier families. Obtain the LVT offset from the correct MSR for those families. Signed-off-by: Aravind Gopalakrishnan <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Tony Luck <[email protected]> Cc: linux-edac <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/kernel/cpu/mcheck/mce_amd.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c index 5982227..a77a452 100644 --- a/arch/x86/kernel/cpu/mcheck/mce_amd.c +++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c @@ -49,6 +49,11 @@ #define DEF_LVT_OFF 0x2 #define DEF_INT_TYPE_APIC 0x2 +/* Scalable MCA: */ + +/* Threshold LVT offset is at MSR0xC0000410[15:12] */ +#define SMCA_THR_LVT_OFF 0xF000 + static const char * const th_names[] = { "load_store", "insn_fetch", @@ -142,6 +147,14 @@ static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi) } if (apic != msr) { + /* + * On SMCA CPUs, LVT offset is programmed at a different MSR, and + * the BIOS provides the value. The original field where LVT offset + * was set is reserved. Return early here: + */ + if (mce_flags.smca) + return 0; + pr_err(FW_BUG "cpu %d, invalid threshold interrupt offset %d " "for bank %d, block %d (MSR%08X=0x%x%08x)\n", b->cpu, apic, b->bank, b->block, b->address, hi, lo); @@ -300,7 +313,19 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c) goto init; b.interrupt_enable = 1; - new = (high & MASK_LVTOFF_HI) >> 20; + + if (mce_flags.smca) { + u32 smca_low, smca_high; + + /* Gather LVT offset for thresholding: */ + if (rdmsr_safe(MSR_CU_DEF_ERR, &smca_low, &smca_high)) + break; + + new = (smca_low & SMCA_THR_LVT_OFF) >> 12; + } else { + new = (high & MASK_LVTOFF_HI) >> 20; + } + offset = setup_APIC_mce_threshold(offset, new); if ((offset == new) &&
