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Wysocki" , Mika Westerberg , Bjorn Helgaas CC: , , "Andy Shevchenko" , , Kuppuswamy Sathyanarayanan , "Iain Lane" , Shyam-sundar S-k , Mario Limonciello Subject: [PATCH v13 09/12] ACPI: x86: s2idle: Add a function to get constraints for a device Date: Fri, 18 Aug 2023 00:13:16 -0500 Message-ID: <20230818051319.551-10-mario.limonciello@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230818051319.551-1-mario.limonciello@amd.com> References: <20230818051319.551-1-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-TrafficTypeDiagnostic: SN1PEPF0002636C:EE_|BN9PR12MB5354:EE_ X-MS-Office365-Filtering-Correlation-Id: 69c28048-0627-404d-4363-08db9faa1543 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:(13230031)(4636009)(346002)(136003)(39860400002)(376002)(396003)(186009)(1800799009)(82310400011)(451199024)(36840700001)(46966006)(40470700004)(6666004)(7696005)(40460700003)(86362001)(16526019)(336012)(426003)(1076003)(26005)(40480700001)(83380400001)(36756003)(36860700001)(47076005)(81166007)(82740400003)(356005)(2616005)(2906002)(54906003)(316002)(41300700001)(70206006)(70586007)(110136005)(44832011)(5660300002)(8676002)(4326008)(8936002)(478600001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Aug 2023 05:15:05.2418 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 69c28048-0627-404d-4363-08db9faa1543 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: SN1PEPF0002636C.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN9PR12MB5354 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Other parts of the kernel may use constraints information to make decisions on what power state to put a device into. Signed-off-by: Mario Limonciello --- v12->v13: * Drop checking for enabled, just return constraints v11->v12: * Use for_each_lpi_constraint instead * use CONFIG_SUSPEND instead of CONFIG_ACPI_SLEEP v9->v10: * split from other patches * kerneldoc fixes * move debug statement to this function --- drivers/acpi/x86/s2idle.c | 24 ++++++++++++++++++++++++ include/linux/acpi.h | 6 ++++++ 2 files changed, 30 insertions(+) diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c index 1aa3cd5677bd8..dd961f3a60577 100644 --- a/drivers/acpi/x86/s2idle.c +++ b/drivers/acpi/x86/s2idle.c @@ -299,6 +299,30 @@ static void lpi_device_get_constraints(void) ACPI_FREE(out_obj); } +/** + * acpi_get_lps0_constraint - get any LPS0 constraint for a device + * @dev: device to get constraints for + * + * Returns: + * - the value for constraint. + * - Otherwise, -ENODEV. + */ +int acpi_get_lps0_constraint(struct device *dev) +{ + struct lpi_constraints *entry; + + for_each_lpi_constraint(entry) { + if (!device_match_acpi_handle(dev, entry->handle)) + continue; + acpi_handle_debug(entry->handle, + "ACPI device constraint: %d\n", entry->min_dstate); + return entry->min_dstate; + } + dev_dbg(dev, "No ACPI device constraint specified\n"); + + return -ENODEV; +} + static void lpi_check_constraints(void) { struct lpi_constraints *entry; diff --git a/include/linux/acpi.h b/include/linux/acpi.h index f1552c04a2856..6745535444c76 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -1109,6 +1109,12 @@ struct acpi_s2idle_dev_ops { }; int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg); void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg); +int acpi_get_lps0_constraint(struct device *dev); +#else /* CONFIG_SUSPEND && CONFIG_X86 */ +static inline int acpi_get_lps0_constraint(struct device *dev) +{ + return -ENODEV; +} #endif /* CONFIG_SUSPEND && CONFIG_X86 */ #ifndef CONFIG_IA64 void arch_reserve_mem_area(acpi_physical_address addr, size_t size);