From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF81BC2BABC for ; Tue, 7 Apr 2020 06:34:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AD03F2082D for ; Tue, 7 Apr 2020 06:34:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="3gcwL1+W" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726448AbgDGGeB (ORCPT ); Tue, 7 Apr 2020 02:34:01 -0400 Received: from frisell.zx2c4.com ([192.95.5.64]:34753 "EHLO frisell.zx2c4.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727089AbgDGGd6 (ORCPT ); Tue, 7 Apr 2020 02:33:58 -0400 Received: by frisell.zx2c4.com (ZX2C4 Mail Server) with ESMTP id 9ab397b9; Tue, 7 Apr 2020 06:25:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=zx2c4.com; h=from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; s=mail; bh=jnfqAcB3FkJJghojQNXETQmiD XM=; b=3gcwL1+WjA8BQ7Cevgi80DvJ02fa2QeAaH8mhH3zDS8mraY/l/jPs30/x oV/1oXf5jR59xrff0vmfJsq2ruGKk149PwCwgoJcexA+CECBVs3JD23dH6DyUAqr lO7Lf7AgWQWbwd3xrTziEajJcRbZkuWNyeZwEVwtwJGutp96H71oh9xSEJrnltjI DBtFvmBj24FbF5WgFG2K9fA2O5MvZrKQ8yNMSYS+dOsgKvz7zgI8X4d749uUUFep bEBrd6FWjly/stvpyE5NapE8Z+MmVyxRAFCtPYPERS8zYFIlDXPK6Zsm3O5kxk8B hkWqeMcNp+84MMhDAFx0K3/g2oDyg== Received: by frisell.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id d2fa65a3 (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256:NO); Tue, 7 Apr 2020 06:25:02 +0000 (UTC) From: "Jason A. Donenfeld" To: linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org, x86@kernel.org, arnd@arndb.de, srinivas.pandruvada@linux.intel.com, bberg@redhat.com, bp@suse.de Cc: "Jason A. Donenfeld" Subject: [PATCH 3/3] x86/mce/therm_throt: allow disabling the thermal vector altogether Date: Tue, 7 Apr 2020 00:33:45 -0600 Message-Id: <20200407063345.4484-3-Jason@zx2c4.com> In-Reply-To: <20200407063345.4484-1-Jason@zx2c4.com> References: <20200407063345.4484-1-Jason@zx2c4.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-edac-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-edac@vger.kernel.org The thermal IRQ handler uses 1.21% CPU on my system when it's hot from compiling things. Indeed looking at /proc/interrupts reveals quite a lot of events coming in. Beyond logging them, the existing drivers on the system don't appear to do very much that I'm interested in. So, add a way to disable this entirely so that I can regain precious CPU cycles. Signed-off-by: Jason A. Donenfeld --- arch/x86/Kconfig | 4 ++++ arch/x86/kernel/cpu/mce/intel.c | 3 ++- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 39e7444353af..3125a11932f2 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1157,7 +1157,11 @@ config X86_MCE_INJECT config X86_THERMAL_VECTOR def_bool y + prompt "Machine check thermal vector" depends on X86_MCE_INTEL + ---help--- + Provide support for capturing thermal events, logging them, and + passing them off to other drivers. config X86_MCE_THERMAL_VERBOSE bool "Verbose logging for thermal events" diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c index f996ffb887bc..d14f1922fb49 100644 --- a/arch/x86/kernel/cpu/mce/intel.c +++ b/arch/x86/kernel/cpu/mce/intel.c @@ -511,7 +511,8 @@ static void intel_ppin_init(struct cpuinfo_x86 *c) void mce_intel_feature_init(struct cpuinfo_x86 *c) { - intel_init_thermal(c); + if (IS_ENABLED(CONFIG_X86_THERMAL_VECTOR)) + intel_init_thermal(c); intel_init_cmci(); intel_init_lmce(); intel_ppin_init(c); -- 2.26.0