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=-6.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable 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 89535C2D0BF for ; Fri, 13 Dec 2019 09:27:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 601182253D for ; Fri, 13 Dec 2019 09:27:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726613AbfLMJ1b (ORCPT ); Fri, 13 Dec 2019 04:27:31 -0500 Received: from cloudserver094114.home.pl ([79.96.170.134]:43234 "EHLO cloudserver094114.home.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725945AbfLMJ1b (ORCPT ); Fri, 13 Dec 2019 04:27:31 -0500 Received: from 79.184.255.82.ipv4.supernova.orange.pl (79.184.255.82) (HELO kreacher.localnet) by serwer1319399.home.pl (79.96.170.134) with SMTP (IdeaSmtpServer 0.83.320) id 9e2bfb5acf4f8881; Fri, 13 Dec 2019 10:27:28 +0100 From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Linux ACPI , Len Brown , Srinivas Pandruvada , Len Brown Subject: [PATCH v1 09/10] intel_idle: Add module parameter to prevent ACPI _CST from being used Date: Fri, 13 Dec 2019 10:24:58 +0100 Message-ID: <4991900.sFTjH42vUX@kreacher> In-Reply-To: <3950312.2WmFeOdZGY@kreacher> References: <3950312.2WmFeOdZGY@kreacher> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Rafael J. Wysocki" Add a new module parameter called "no_acpi" to the intel_idle driver to allow the driver to be prevented from using ACPI _CST via kernel command line. Signed-off-by: Rafael J. Wysocki --- No changes from the RFC version. --- drivers/idle/intel_idle.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index a072b84d9595..26fe383bb921 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -1138,6 +1138,10 @@ static bool intel_idle_max_cstate_reached(int cstate) #ifdef CONFIG_ACPI_PROCESSOR_CSTATE #include +static bool no_acpi __read_mostly; +module_param(no_acpi, bool, 0444); +MODULE_PARM_DESC(no_acpi, "Do not use ACPI _CST for building the idle states list"); + static struct acpi_processor_power acpi_state_table; /** @@ -1167,6 +1171,11 @@ static bool intel_idle_acpi_cst_extract(void) { unsigned int cpu; + if (no_acpi) { + pr_debug("Not allowed to use ACPI _CST\n"); + return false; + } + for_each_possible_cpu(cpu) { struct acpi_processor *pr = per_cpu(processors, cpu); -- 2.16.4