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Wysocki" , Catalin Marinas , Will Deacon CC: , , Mario Limonciello , Sudeep Holla Subject: [PATCH v2 1/2] PSCI: cpuidle: Move the `has_lpi` check to the beginning of the function Date: Fri, 25 Feb 2022 13:06:45 -0600 Message-ID: <20220225190646.1045695-2-mario.limonciello@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220225190646.1045695-1-mario.limonciello@amd.com> References: <20220225190646.1045695-1-mario.limonciello@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 983be2d5-cf8a-4314-fe21-08d9f8929ec8 X-MS-TrafficTypeDiagnostic: BL0PR12MB2388:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230001)(4636009)(46966006)(36840700001)(40470700004)(2616005)(40460700003)(83380400001)(26005)(47076005)(1076003)(186003)(16526019)(336012)(426003)(356005)(86362001)(82310400004)(36860700001)(81166007)(6666004)(316002)(54906003)(110136005)(36756003)(8676002)(70586007)(70206006)(508600001)(44832011)(4326008)(2906002)(8936002)(5660300002)(81973001)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Feb 2022 19:11:26.1428 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 983be2d5-cf8a-4314-fe21-08d9f8929ec8 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT056.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR12MB2388 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Currently the first thing checked is whether the PCSI cpu_suspend function has been initialized. Another change will be overloading `acpi_processor_ffh_lpi_probe` and calling it sooner. So make the `has_lpi` check the first thing checked to prepare for that change. Reviewed-by: Sudeep Holla Signed-off-by: Mario Limonciello --- arch/arm64/kernel/cpuidle.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c index 03991eeff643..3006f4324808 100644 --- a/arch/arm64/kernel/cpuidle.c +++ b/arch/arm64/kernel/cpuidle.c @@ -54,6 +54,9 @@ static int psci_acpi_cpu_init_idle(unsigned int cpu) struct acpi_lpi_state *lpi; struct acpi_processor *pr = per_cpu(processors, cpu); + if (unlikely(!pr || !pr->flags.has_lpi)) + return -EINVAL; + /* * If the PSCI cpu_suspend function hook has not been initialized * idle states must not be enabled, so bail out @@ -61,9 +64,6 @@ static int psci_acpi_cpu_init_idle(unsigned int cpu) if (!psci_ops.cpu_suspend) return -EOPNOTSUPP; - if (unlikely(!pr || !pr->flags.has_lpi)) - return -EINVAL; - count = pr->power.count - 1; if (count <= 0) return -ENODEV; From patchwork Fri Feb 25 19:06:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mario Limonciello X-Patchwork-Id: 547626 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 40FC0C433F5 for ; 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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; Received: from SATLEXMB04.amd.com (165.204.84.17) by DM6NAM11FT056.mail.protection.outlook.com (10.13.173.99) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5017.22 via Frontend Transport; Fri, 25 Feb 2022 19:11:27 +0000 Received: from localhost.localdomain (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.18; Fri, 25 Feb 2022 13:11:25 -0600 From: Mario Limonciello To: "Rafael J . Wysocki" , Catalin Marinas , Will Deacon CC: , , Mario Limonciello , Sudeep Holla Subject: [PATCH v2 2/2] ACPI: processor idle: Check for architectural support for LPI Date: Fri, 25 Feb 2022 13:06:46 -0600 Message-ID: <20220225190646.1045695-3-mario.limonciello@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220225190646.1045695-1-mario.limonciello@amd.com> References: <20220225190646.1045695-1-mario.limonciello@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b7c340fb-3280-40ea-9e97-08d9f8929f55 X-MS-TrafficTypeDiagnostic: CY4PR1201MB0184:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230001)(4636009)(36840700001)(46966006)(40470700004)(316002)(186003)(83380400001)(36756003)(356005)(508600001)(54906003)(110136005)(26005)(16526019)(1076003)(336012)(426003)(81166007)(86362001)(2616005)(40460700003)(70586007)(4326008)(8676002)(70206006)(2906002)(82310400004)(47076005)(6666004)(8936002)(5660300002)(36860700001)(44832011)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Feb 2022 19:11:27.0644 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b7c340fb-3280-40ea-9e97-08d9f8929f55 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT056.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR1201MB0184 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org When `osc_pc_lpi_support_confirmed` is set through `_OSC` and `_LPI` is populated then the cpuidle driver assumes that LPI is fully functional. However currently the kernel only provides architectural support for LPI on ARM. This leads to high power consumption on X86 platforms that otherwise try to enable LPI. So probe whether or not LPI support is implemented before enabling LPI in the kernel. This is done by overloading `acpi_processor_ffh_lpi_probe` to check whether it returns `-EOPNOTSUPP`. It also means that all future implementations of `acpi_processor_ffh_lpi_probe` will need to follow these semantics as well. Reviewed-by: Sudeep Holla Signed-off-by: Mario Limonciello --- drivers/acpi/processor_idle.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index f8e9fa82cb9b..32b20efff5f8 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -1080,6 +1080,11 @@ static int flatten_lpi_states(struct acpi_processor *pr, return 0; } +int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu) +{ + return -EOPNOTSUPP; +} + static int acpi_processor_get_lpi_info(struct acpi_processor *pr) { int ret, i; @@ -1088,6 +1093,11 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr) struct acpi_device *d = NULL; struct acpi_lpi_states_array info[2], *tmp, *prev, *curr; + /* make sure our architecture has support */ + ret = acpi_processor_ffh_lpi_probe(pr->id); + if (ret == -EOPNOTSUPP) + return ret; + if (!osc_pc_lpi_support_confirmed) return -EOPNOTSUPP; @@ -1139,11 +1149,6 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr) return 0; } -int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu) -{ - return -ENODEV; -} - int __weak acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi) { return -ENODEV;