From 51756a5034c12da3ce1286749b0e05de8bfbbbaf Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Sat, 22 Nov 2014 11:47:07 +0100 Subject: [PATCH] EDAC, mce_amd_inj: Add an injector function Selectively inject either a real MCE or a sw-only version which exercises the decoding path only. The hardware-injected MCE triggers a machine check exception (#MC) so that the MCE handler can be bothered to do something too. Signed-off-by: Borislav Petkov --- drivers/edac/mce_amd_inj.c | 53 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 51 insertions(+), 2 deletions(-) diff --git a/drivers/edac/mce_amd_inj.c b/drivers/edac/mce_amd_inj.c index 5a758d63a8cc..0bd91a802c67 100644 --- a/drivers/edac/mce_amd_inj.c +++ b/drivers/edac/mce_amd_inj.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include "mce_amd.h" @@ -116,6 +117,55 @@ static int inj_extcpu_set(void *data, u64 val) DEFINE_SIMPLE_ATTRIBUTE(extcpu_fops, inj_extcpu_get, inj_extcpu_set, "%llu\n"); +static void trigger_mce(void *info) +{ + asm volatile("int $18"); +} + +static void do_inject(void) +{ + u64 mcg_status = 0; + unsigned int cpu = i_mce.extcpu; + u8 b = i_mce.bank; + + if (!(i_mce.inject_flags & MCJ_EXCEPTION)) { + amd_decode_mce(NULL, 0, &i_mce); + return; + } + + get_online_cpus(); + if (!cpu_online(cpu)) + goto err; + + /* prep MCE global settings for the injection */ + mcg_status = MCG_STATUS_MCIP | MCG_STATUS_EIPV; + + if (!(i_mce.status & MCI_STATUS_PCC)) + mcg_status |= MCG_STATUS_RIPV; + + toggle_hw_mce_inject(cpu, true); + + wrmsr_on_cpu(cpu, MSR_IA32_MCG_STATUS, + (u32)mcg_status, (u32)(mcg_status >> 32)); + + wrmsr_on_cpu(cpu, MSR_IA32_MCx_STATUS(b), + (u32)i_mce.status, (u32)(i_mce.status >> 32)); + + wrmsr_on_cpu(cpu, MSR_IA32_MCx_ADDR(b), + (u32)i_mce.addr, (u32)(i_mce.addr >> 32)); + + wrmsr_on_cpu(cpu, MSR_IA32_MCx_MISC(b), + (u32)i_mce.misc, (u32)(i_mce.misc >> 32)); + + toggle_hw_mce_inject(cpu, false); + + smp_call_function_single(cpu, trigger_mce, NULL, 0); + +err: + put_online_cpus(); + +} + /* * This denotes into which bank we're injecting and triggers * the injection, at the same time. @@ -132,8 +182,7 @@ static int inj_bank_set(void *data, u64 val) } m->bank = val; - - amd_decode_mce(NULL, 0, m); + do_inject(); return 0; }