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Thu, 22 Apr 2021 20:30:54 +0000 Received: from HQMAIL101.nvidia.com (172.20.187.10) by HQMAIL111.nvidia.com (172.20.187.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 22 Apr 2021 20:30:54 +0000 Received: from skomatineni-linux.nvidia.com (172.20.145.6) by mail.nvidia.com (172.20.187.10) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 22 Apr 2021 20:30:53 +0000 From: Sowjanya Komatineni To: , , , , , , , CC: , , , , , , , Subject: [RFC PATCH 1/4] firmware/psci: add support for PSCI function SET_STATE_IDLE_TIME Date: Thu, 22 Apr 2021 13:30:45 -0700 Message-ID: <1619123448-10138-2-git-send-email-skomatineni@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1619123448-10138-1-git-send-email-skomatineni@nvidia.com> References: <1619123448-10138-1-git-send-email-skomatineni@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5cfe9a73-b5f1-4378-481b-08d905cd8767 X-MS-TrafficTypeDiagnostic: DM5PR12MB2406: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5236; 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DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Apr 2021 20:30:54.6723 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5cfe9a73-b5f1-4378-481b-08d905cd8767 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.112.35]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT064.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB2406 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This patch adds support for new PSCI function ID SET_STATE_IDLE_TIME. Some platforms use separate CPU firmware to handle all state transition based on state enter request from kernel and may need runtime state idle time of the corresponding state from kernel to pass to TF-A through PSCI. Current PSCI specification has no way of passing runtime state information from kernel to TF-A. So, this patch adds implementation for new PSCI function ID for this purpose. Signed-off-by: Sowjanya Komatineni --- drivers/firmware/psci/psci.c | 9 +++++++++ include/linux/psci.h | 1 + include/uapi/linux/psci.h | 2 ++ 3 files changed, 12 insertions(+) diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c index f5bd0dc..3bd63d7 100644 --- a/drivers/firmware/psci/psci.c +++ b/drivers/firmware/psci/psci.c @@ -180,6 +180,14 @@ static int psci_0_1_cpu_suspend(u32 state, unsigned long entry_point) state, entry_point); } +static int psci_set_state_idle_time(u32 idle_time) +{ + int err; + + err = invoke_psci_fn(PSCI_1_1_FN_SET_STATE_IDLE_TIME, idle_time, 0, 0); + return psci_to_linux_errno(err); +} + static int psci_0_2_cpu_suspend(u32 state, unsigned long entry_point) { return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND), @@ -470,6 +478,7 @@ static void __init psci_0_2_set_functions(void) .migrate = psci_0_2_migrate, .affinity_info = psci_affinity_info, .migrate_info_type = psci_migrate_info_type, + .set_state_idle_time = psci_set_state_idle_time, }; arm_pm_restart = psci_sys_reset; diff --git a/include/linux/psci.h b/include/linux/psci.h index 4ca0060..6643bfd 100644 --- a/include/linux/psci.h +++ b/include/linux/psci.h @@ -30,6 +30,7 @@ struct psci_operations { int (*affinity_info)(unsigned long target_affinity, unsigned long lowest_affinity_level); int (*migrate_info_type)(void); + int (*set_state_idle_time)(u32 idle_time); }; extern struct psci_operations psci_ops; diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h index 2fcad1d..0013db74 100644 --- a/include/uapi/linux/psci.h +++ b/include/uapi/linux/psci.h @@ -55,6 +55,8 @@ #define PSCI_1_0_FN64_SYSTEM_SUSPEND PSCI_0_2_FN64(14) #define PSCI_1_1_FN64_SYSTEM_RESET2 PSCI_0_2_FN64(18) +#define PSCI_1_1_FN_SET_STATE_IDLE_TIME PSCI_0_2_FN(25) + /* PSCI v0.2 power state encoding for CPU_SUSPEND function */ #define PSCI_0_2_POWER_STATE_ID_MASK 0xffff #define PSCI_0_2_POWER_STATE_ID_SHIFT 0 From patchwork Thu Apr 22 20:30:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sowjanya Komatineni X-Patchwork-Id: 425930 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT 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 CB859C43611 for ; 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vger.kernel.org; dkim=none (message not signed) header.d=none; vger.kernel.org; dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.112.34 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.112.34; helo=mail.nvidia.com; Received: from mail.nvidia.com (216.228.112.34) by CO1NAM11FT006.mail.protection.outlook.com (10.13.174.246) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.4065.21 via Frontend Transport; Thu, 22 Apr 2021 20:30:56 +0000 Received: from HQMAIL101.nvidia.com (172.20.187.10) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 22 Apr 2021 20:30:55 +0000 Received: from skomatineni-linux.nvidia.com (172.20.145.6) by mail.nvidia.com (172.20.187.10) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 22 Apr 2021 20:30:55 +0000 From: Sowjanya Komatineni To: , , , , , , , CC: , , , , , , , Subject: [RFC PATCH 3/4] cpuidle: psci: pass state idle time before state enter callback Date: Thu, 22 Apr 2021 13:30:47 -0700 Message-ID: <1619123448-10138-4-git-send-email-skomatineni@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1619123448-10138-1-git-send-email-skomatineni@nvidia.com> References: <1619123448-10138-1-git-send-email-skomatineni@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: ca233226-44e0-4ab5-c21b-08d905cd8897 X-MS-TrafficTypeDiagnostic: CO6PR12MB5393: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6108; 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DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Apr 2021 20:30:56.6498 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ca233226-44e0-4ab5-c21b-08d905cd8897 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.112.34]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT006.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR12MB5393 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Some platforms use separate CPU firmware to handle all state transition decisions and may need runtime state idle time of the target state it is going to enter. This patch calls set_state_idle_time psci operation callback to pass the state idle time to TF-A through PSCI before calling psci_enter_state. Signed-off-by: Sowjanya Komatineni --- drivers/cpuidle/cpuidle-psci.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c index b51b5df..22a5003 100644 --- a/drivers/cpuidle/cpuidle-psci.c +++ b/drivers/cpuidle/cpuidle-psci.c @@ -151,6 +151,17 @@ static int psci_enter_idle_state(struct cpuidle_device *dev, { u32 *state = __this_cpu_read(psci_cpuidle_data.psci_states); + /* + * Some platforms use separate CPU firmware running in background to + * handle state transition which may need runtime idle time of the + * corresponding state from kernel. + * So, pass the state idle time from kernel to TF-A firmware through + * PSCI. Platform specific TF-A firmware may update this to CPU + * firmware. + */ + if (idx) + psci_ops.set_state_idle_time(drv->states[idx].idle_time); + return psci_enter_state(idx, state[idx]); }