From patchwork Wed Jan 26 11:44:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anup Patel X-Patchwork-Id: 12724974 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 57E90C5DF62 for ; Wed, 26 Jan 2022 11:45:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240886AbiAZLpQ (ORCPT ); Wed, 26 Jan 2022 06:45:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240876AbiAZLpP (ORCPT ); Wed, 26 Jan 2022 06:45:15 -0500 Received: from mail-pj1-x1036.google.com (mail-pj1-x1036.google.com [IPv6:2607:f8b0:4864:20::1036]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 156DCC061747 for ; Wed, 26 Jan 2022 03:45:15 -0800 (PST) Received: by mail-pj1-x1036.google.com with SMTP id r59so5092471pjg.4 for ; Wed, 26 Jan 2022 03:45:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=s5PgLHdLhcwiJdVhNsOwglrdY0pbHmFnLAELykCh5Ws=; b=PYGgs67GQPFDJ15PjfEz6fgO2DTbqR/L4BR+YDKngG7olmoD8RgBVJsLkK480Vr3Hb ieMxqYaA+CV0ToHsTK/RS4zRCGGCtuWrzrvxLaDbtZrsxz57UFH/oL19/Cueh1OPjSJ1 J0pjcqm5DjB7jkJhR1iO7SwCHzJvZq/1iGTUXgiYJN36WPVJJIVLYj+4893mC9xbaMx1 SoLXCKyuGUbf76s2DUNGPydGvs/x0Ma73H1W11cFThxK1uiJfrICNSy+RIxTZBMQcF9Q RI6OYDT/PTOsGkKbtJh4t1l/c6K2Sqjhx0WJNnKa60o+qRiN6P3n1AA1mLODSDVjugY5 0msQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=s5PgLHdLhcwiJdVhNsOwglrdY0pbHmFnLAELykCh5Ws=; b=mIK1RjQXGNaIt6TIGBdrFFT3XMKkGKb89sgoEsJqhDvwIfSdzUNkJbRHLxuMu6KhjV m1pyR87DiaPNC2Z86iDkrtII8jS89AwupxXdfnWD+Fvdss/kTm9g0Ss9umRa74srRkVX A0hz3gkBuZcIwM1q5jXo3zZqFIcPu8VvEcItUMUcuOOua57sLfbwj6rerWPWso1GHkjo oIJQmdxrFBIsJoGGFRtbtkfMkqh6LYCKzHOydLrubjIvYdzmoLJidOzROh63V0NWiWCX /tVfk4oekMKA/8JJp0+cTAa1efJwnCx30vp/x2SJkdpD8tPpyHeyHpZoV6Ir1TEaFYk1 /8Dw== X-Gm-Message-State: AOAM533KgoAAnIDZf9MvC/NrN+ENAVQA8L4U2nUXiyo7dTA6uty6PF86 DgRtfrLfu1/+EXvABS7TwSJwyQ== X-Google-Smtp-Source: ABdhPJwAY0SiEeiP7NCmqUrkybPvy8Zo1tT1PswCl1bTDjTh1U5WwHZ70oyc8R+cYGUMwlpIaC2zCg== X-Received: by 2002:a17:90b:1bc1:: with SMTP id oa1mr8327304pjb.209.1643197514585; Wed, 26 Jan 2022 03:45:14 -0800 (PST) Received: from localhost.localdomain ([122.167.221.23]) by smtp.gmail.com with ESMTPSA id nn2sm2994976pjb.35.2022.01.26.03.45.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jan 2022 03:45:14 -0800 (PST) From: Anup Patel To: Palmer Dabbelt , Paul Walmsley , Albert Ou , Daniel Lezcano , Ulf Hansson , "Rafael J . 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, kvm-riscv@lists.infradead.org Subject: [PATCH v10 1/8] RISC-V: Enable CPU_IDLE drivers Date: Wed, 26 Jan 2022 17:14:45 +0530 Message-Id: <20220126114452.692512-2-apatel@ventanamicro.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220126114452.692512-1-apatel@ventanamicro.com> References: <20220126114452.692512-1-apatel@ventanamicro.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Anup Patel 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 Signed-off-by: Anup Patel Reviewed-by: Guo Ren --- 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 5adcbd9b5e88..76976d12b463 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 @@ -547,4 +548,10 @@ source "kernel/power/Kconfig" endmenu +menu "CPU Power Management" + +source "drivers/cpuidle/Kconfig" + +endmenu + source "arch/riscv/kvm/Kconfig" diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig index f120fcc43d0a..a5e0482a4969 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=m CONFIG_JUMP_LABEL=y diff --git a/arch/riscv/configs/rv32_defconfig b/arch/riscv/configs/rv32_defconfig index 8b56a7f1eb06..d1b87db54d68 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=m 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(); }