From patchwork Fri Sep 5 17:34:52 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 4853611 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id E407BC0338 for ; Fri, 5 Sep 2014 17:35:03 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id F3DB720225 for ; Fri, 5 Sep 2014 17:35:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A8B892021A for ; Fri, 5 Sep 2014 17:35:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754373AbaIERe5 (ORCPT ); Fri, 5 Sep 2014 13:34:57 -0400 Received: from service87.mimecast.com ([91.220.42.44]:54515 "EHLO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754715AbaIERey (ORCPT ); Fri, 5 Sep 2014 13:34:54 -0400 Received: from cam-owa2.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.21]) by service87.mimecast.com; Fri, 05 Sep 2014 18:34:52 +0100 Received: from red-moon.cambridge.arm.com ([10.1.255.212]) by cam-owa2.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.3959); Fri, 5 Sep 2014 18:34:51 +0100 From: Lorenzo Pieralisi To: linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org Cc: devicetree@vger.kernel.org, Lorenzo Pieralisi , Mark Rutland , Sudeep Holla , Catalin Marinas , Will Deacon , Charles Garcia Tobin , Nicolas Pitre , Rob Herring , Grant Likely , Peter De Schrijver , Santosh Shilimkar , Daniel Lezcano , Amit Kucheria , Vincent Guittot , Antti Miettinen , Stephen Boyd , Kevin Hilman , Sebastian Capella , Mark Brown , Paul Walmsley , Chander Kashyap , Geoff Levand , Bartlomiej Zolnierkiewicz , Ashwin Chaugule , Lina Iyer Subject: [PATCH v9 3/8] arm64: kernel: introduce cpu_init_idle CPU operation Date: Fri, 5 Sep 2014 18:34:52 +0100 Message-Id: <1409938498-17984-4-git-send-email-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1409938498-17984-1-git-send-email-lorenzo.pieralisi@arm.com> References: <1409938498-17984-1-git-send-email-lorenzo.pieralisi@arm.com> X-OriginalArrivalTime: 05 Sep 2014 17:34:51.0168 (UTC) FILETIME=[B274D200:01CFC92F] X-MC-Unique: 114090518345200701 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-8.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The CPUidle subsystem on ARM64 machines requires the idle states implementation back-end to initialize idle states parameter upon boot. This patch adds a hook in the CPU operations structure that should be initialized by the CPU operations back-end in order to provide a function that initializes cpu idle states. This patch also adds the infrastructure to arm64 kernel required to export the CPU operations based initialization interface, so that drivers (ie CPUidle) can use it when they are initialized at probe time. Reviewed-by: Catalin Marinas Signed-off-by: Lorenzo Pieralisi --- arch/arm64/include/asm/cpu_ops.h | 3 +++ arch/arm64/include/asm/cpuidle.h | 13 +++++++++++++ arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/cpuidle.c | 31 +++++++++++++++++++++++++++++++ 4 files changed, 48 insertions(+) create mode 100644 arch/arm64/include/asm/cpuidle.h create mode 100644 arch/arm64/kernel/cpuidle.c diff --git a/arch/arm64/include/asm/cpu_ops.h b/arch/arm64/include/asm/cpu_ops.h index d7b4b38..47dfa31 100644 --- a/arch/arm64/include/asm/cpu_ops.h +++ b/arch/arm64/include/asm/cpu_ops.h @@ -28,6 +28,8 @@ struct device_node; * enable-method property. * @cpu_init: Reads any data necessary for a specific enable-method from the * devicetree, for a given cpu node and proposed logical id. + * @cpu_init_idle: Reads any data necessary to initialize CPU idle states from + * devicetree, for a given cpu node and proposed logical id. * @cpu_prepare: Early one-time preparation step for a cpu. If there is a * mechanism for doing so, tests whether it is possible to boot * the given CPU. @@ -47,6 +49,7 @@ struct device_node; struct cpu_operations { const char *name; int (*cpu_init)(struct device_node *, unsigned int); + int (*cpu_init_idle)(struct device_node *, unsigned int); int (*cpu_prepare)(unsigned int); int (*cpu_boot)(unsigned int); void (*cpu_postboot)(void); diff --git a/arch/arm64/include/asm/cpuidle.h b/arch/arm64/include/asm/cpuidle.h new file mode 100644 index 0000000..b52a993 --- /dev/null +++ b/arch/arm64/include/asm/cpuidle.h @@ -0,0 +1,13 @@ +#ifndef __ASM_CPUIDLE_H +#define __ASM_CPUIDLE_H + +#ifdef CONFIG_CPU_IDLE +extern int cpu_init_idle(unsigned int cpu); +#else +static inline int cpu_init_idle(unsigned int cpu) +{ + return -EOPNOTSUPP; +} +#endif + +#endif diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index 383d81d..be78980 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -27,6 +27,7 @@ arm64-obj-$(CONFIG_PERF_EVENTS) += perf_regs.o arm64-obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o +arm64-obj-$(CONFIG_CPU_IDLE) += cpuidle.o arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o arm64-obj-$(CONFIG_KGDB) += kgdb.o arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c new file mode 100644 index 0000000..19d17f5 --- /dev/null +++ b/arch/arm64/kernel/cpuidle.c @@ -0,0 +1,31 @@ +/* + * ARM64 CPU idle arch support + * + * Copyright (C) 2014 ARM Ltd. + * Author: Lorenzo Pieralisi + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include + +#include +#include + +int cpu_init_idle(unsigned int cpu) +{ + int ret = -EOPNOTSUPP; + struct device_node *cpu_node = of_cpu_device_node_get(cpu); + + if (!cpu_node) + return -ENODEV; + + if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_init_idle) + ret = cpu_ops[cpu]->cpu_init_idle(cpu_node, cpu); + + of_node_put(cpu_node); + return ret; +}