From: Yazen Ghannam yazen.ghannam@amd.com
[ Upstream commit ec33838244c8535b23b8d24b167996fd1318bb68 ]
AMD systems have non-core, shared MCA banks within a die. These banks are controlled by a master CPU per die. If this CPU is offlined then all the shared banks are disabled in addition to the CPU's core banks.
Also, Fam17h systems may have SMT enabled. The MCA_CTL register is shared between SMT thread siblings. If a CPU is offlined then all its sibling's MCA banks are also disabled.
Extend the existing vendor check to AMD too.
Signed-off-by: Yazen Ghannam yazen.ghannam@amd.com [ Fix up comment. ] Signed-off-by: Borislav Petkov bp@suse.de Cc: Borislav Petkov bp@alien8.de Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Cc: Tony Luck tony.luck@intel.com Cc: linux-edac linux-edac@vger.kernel.org Link: http://lkml.kernel.org/r/20170613162835.30750-8-bp@alien8.de Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- arch/x86/kernel/cpu/mcheck/mce.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c index 6edb9530d7e9..8a79833e627d 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -2081,12 +2081,13 @@ static void mce_disable_error_reporting(void) static void vendor_disable_error_reporting(void) { /* - * Don't clear on Intel CPUs. Some of these MSRs are socket-wide. + * Don't clear on Intel or AMD CPUs. Some of these MSRs are socket-wide. * Disabling them for just a single offlined CPU is bad, since it will * inhibit reporting for all shared resources on the socket like the * last level cache (LLC), the integrated memory controller (iMC), etc. */ - if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) + if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL || + boot_cpu_data.x86_vendor == X86_VENDOR_AMD) return;
mce_disable_error_reporting();