Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753939Ab1EISgp (ORCPT ); Mon, 9 May 2011 14:36:45 -0400 Received: from s15228384.onlinehome-server.info ([87.106.30.177]:55050 "EHLO mail.x86-64.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753883Ab1EISgk (ORCPT ); Mon, 9 May 2011 14:36:40 -0400 From: Borislav Petkov To: EDAC devel Cc: X86-ML , LKML , Borislav Petkov Subject: [PATCH -v3 6/6] EDAC, MCE, AMD: Add an injector function Date: Mon, 9 May 2011 20:35:55 +0200 Message-Id: <1304966155-9841-7-git-send-email-bp@amd64.org> X-Mailer: git-send-email 1.7.4.rc2 In-Reply-To: <1304966155-9841-1-git-send-email-bp@amd64.org> References: <1304966155-9841-1-git-send-email-bp@amd64.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2344 Lines: 88 From: Borislav Petkov Selectively inject either a real MCE or a sw-only version which exercises the decoding code 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 | 50 ++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 48 insertions(+), 2 deletions(-) diff --git a/drivers/edac/mce_amd_inj.c b/drivers/edac/mce_amd_inj.c index 592871f..45e8122 100644 --- a/drivers/edac/mce_amd_inj.c +++ b/drivers/edac/mce_amd_inj.c @@ -131,6 +131,53 @@ 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; + int this_cpu; + u8 b = i_mce.bank; + + if (!(i_mce.inject_flags & MCJ_HW_INJECT)) { + amd_decode_mce(NULL, 0, &i_mce); + return; + } + + /* 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; + + this_cpu = get_cpu(); + + 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); + + put_cpu(); + +} + /* * This denotes into which bank we're injecting and triggers * the injection, at the same time. @@ -146,8 +193,7 @@ static int inj_bank_set(void *data, u64 val) } m->bank = val; - - amd_decode_mce(NULL, 0, m); + do_inject(); return 0; } -- 1.7.4.rc2 -- 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/