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Wysocki" , Pavel Machek , Rob Herring Cc: Sandeep Tripathy , Atish Patra , Alistair Francis , Liush , Anup Patel , devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Anup Patel Subject: [PATCH v8 1/8] RISC-V: Enable CPU_IDLE drivers Date: Mon, 11 Oct 2021 13:48:13 +0530 Message-Id: <20211011081820.1135261-2-anup.patel@wdc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211011081820.1135261-1-anup.patel@wdc.com> References: <20211011081820.1135261-1-anup.patel@wdc.com> X-ClientProxiedBy: MA1PR01CA0159.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:71::29) To CO6PR04MB7812.namprd04.prod.outlook.com (2603:10b6:303:138::6) MIME-Version: 1.0 Received: from wdc.com (122.171.184.84) by MA1PR01CA0159.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:71::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4587.18 via Frontend Transport; Mon, 11 Oct 2021 08:18:48 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 43dbe2d9-f419-4a92-2662-08d98c8fc323 X-MS-TrafficTypeDiagnostic: CO6PR04MB8331: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: WDCIPOUTBOUND: EOP-TRUE X-MS-Oob-TLC-OOBClassifiers: OLM:3044; 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:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CO6PR04MB7812.namprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(956004)(110136005)(2616005)(2906002)(55016002)(44832011)(316002)(6666004)(54906003)(5660300002)(83380400001)(38350700002)(38100700002)(8676002)(26005)(86362001)(7416002)(1076003)(36756003)(508600001)(66946007)(8886007)(66556008)(4326008)(66476007)(8936002)(186003)(52116002)(7696005);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: 43dbe2d9-f419-4a92-2662-08d98c8fc323 X-MS-Exchange-CrossTenant-AuthSource: CO6PR04MB7812.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Oct 2021 08:18:53.4844 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: rSa1TPvwJK4uDhBRDJE8wrL0D0VIzy/5zEovFMQM9BSn6JhCCoRjr2HqQSKEGGPjjVSblGyEwLP+20FkhRSiWw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR04MB8331 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org We force select CPU_PM and provide asm/cpuidle.h so that we can use CPU IDLE drivers for Linux RISC-V kernel. Signed-off-by: Anup Patel --- arch/riscv/Kconfig | 7 +++++++ arch/riscv/configs/defconfig | 1 + arch/riscv/configs/rv32_defconfig | 1 + arch/riscv/include/asm/cpuidle.h | 24 ++++++++++++++++++++++++ arch/riscv/kernel/process.c | 3 ++- 5 files changed, 35 insertions(+), 1 deletion(-) create mode 100644 arch/riscv/include/asm/cpuidle.h diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 8de2afb460f7..d02f1f5a2431 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -46,6 +46,7 @@ config RISCV select CLONE_BACKWARDS select CLINT_TIMER if !MMU select COMMON_CLK + select CPU_PM if CPU_IDLE select EDAC_SUPPORT select GENERIC_ARCH_TOPOLOGY if SMP select GENERIC_ATOMIC64 if !64BIT @@ -564,5 +565,11 @@ source "kernel/power/Kconfig" endmenu +menu "CPU Power Management" + +source "drivers/cpuidle/Kconfig" + +endmenu + source "arch/riscv/kvm/Kconfig" source "drivers/firmware/Kconfig" diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig index be21f54e9b91..39b4c32e7997 100644 --- a/arch/riscv/configs/defconfig +++ b/arch/riscv/configs/defconfig @@ -20,6 +20,7 @@ CONFIG_SOC_SIFIVE=y CONFIG_SOC_VIRT=y CONFIG_SMP=y CONFIG_HOTPLUG_CPU=y +CONFIG_CPU_IDLE=y CONFIG_VIRTUALIZATION=y CONFIG_KVM=y CONFIG_JUMP_LABEL=y diff --git a/arch/riscv/configs/rv32_defconfig b/arch/riscv/configs/rv32_defconfig index ad01f50c98f1..fed827c82a9e 100644 --- a/arch/riscv/configs/rv32_defconfig +++ b/arch/riscv/configs/rv32_defconfig @@ -20,6 +20,7 @@ CONFIG_SOC_VIRT=y CONFIG_ARCH_RV32I=y CONFIG_SMP=y CONFIG_HOTPLUG_CPU=y +CONFIG_CPU_IDLE=y CONFIG_VIRTUALIZATION=y CONFIG_KVM=y CONFIG_JUMP_LABEL=y diff --git a/arch/riscv/include/asm/cpuidle.h b/arch/riscv/include/asm/cpuidle.h new file mode 100644 index 000000000000..71fdc607d4bc --- /dev/null +++ b/arch/riscv/include/asm/cpuidle.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2021 Allwinner Ltd + * Copyright (C) 2021 Western Digital Corporation or its affiliates. + */ + +#ifndef _ASM_RISCV_CPUIDLE_H +#define _ASM_RISCV_CPUIDLE_H + +#include +#include + +static inline void cpu_do_idle(void) +{ + /* + * Add mb() here to ensure that all + * IO/MEM accesses are completed prior + * to entering WFI. + */ + mb(); + wait_for_interrupt(); +} + +#endif diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c index 03ac3aa611f5..504b496787aa 100644 --- a/arch/riscv/kernel/process.c +++ b/arch/riscv/kernel/process.c @@ -23,6 +23,7 @@ #include #include #include +#include register unsigned long gp_in_global __asm__("gp"); @@ -37,7 +38,7 @@ extern asmlinkage void ret_from_kernel_thread(void); void arch_cpu_idle(void) { - wait_for_interrupt(); + cpu_do_idle(); raw_local_irq_enable(); }