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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; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CO1NAM11FT093.mail.protection.outlook.com (10.13.175.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5769.21 via Frontend Transport; Mon, 31 Oct 2022 20:43:33 +0000 Received: from AUS-LX-MLIMONCI.amd.com (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 15.1.2375.31; Mon, 31 Oct 2022 15:43:32 -0500 From: Mario Limonciello To: Sven van Ashbrook , Rafael J Wysocki , , CC: Rajneesh Bhardwaj , S-k Shyam-sundar , , Rajat Jain , David E Box , Hans de Goede , Mario Limonciello , Subject: [RFC 0/3] Introduce infrastructure to report time in deepest state Date: Mon, 31 Oct 2022 15:43:16 -0500 Message-ID: <20221031204320.22464-1-mario.limonciello@amd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain 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: CO1NAM11FT093:EE_|SA1PR12MB6824:EE_ X-MS-Office365-Filtering-Correlation-Id: dbc44ec7-a780-4ad6-9036-08dabb8093c7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Oct 2022 20:43:33.4165 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: dbc44ec7-a780-4ad6-9036-08dabb8093c7 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: CO1NAM11FT093.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB6824 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sven van Ashbrook brought a patch to the kernel mailing list that attempted to change the reporting level of a s0ix entry issue to a different debugging level so that infastructure used by Google could better scan logs to catch problems. This approach was rejected, but during the conversation another suggestion was made by David E. Box to introduce some infrastructure into the kernel to report this information. As it's information that is reported by both AMD and Intel platforms over s2idle, this seems to make sense. This series introduces a new sysfs file, a symbol for kernel modules to use to populate it and changes to both AMD and Intel drivers to utilize it. The expectation is that userspace could read this file after s2idle occurred to infer how much of the s2idle cycle was spent in the deepest hardware state. Mario Limonciello (3): PM: Add a sysfs file to represent whether hardware reached the deepest state platform/x86/amd: pmc: Report duration of time in deepest hw state platform/x86/intel/pmc: core: Report duration of time in deepest HW state Documentation/ABI/testing/sysfs-power | 8 ++++++++ drivers/platform/x86/amd/pmc.c | 4 +--- drivers/platform/x86/intel/pmc/core.c | 2 ++ include/linux/suspend.h | 2 ++ kernel/power/main.c | 14 ++++++++++++++ 5 files changed, 27 insertions(+), 3 deletions(-) -- 2.34.1