From patchwork Tue Mar 11 18:40:14 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sebastian Capella X-Patchwork-Id: 3813831 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 9C15E9F38E for ; Tue, 11 Mar 2014 18:41:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3E4CE202F0 for ; Tue, 11 Mar 2014 18:41:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0044B20254 for ; Tue, 11 Mar 2014 18:40:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755311AbaCKSka (ORCPT ); Tue, 11 Mar 2014 14:40:30 -0400 Received: from mail-pa0-f41.google.com ([209.85.220.41]:57755 "EHLO mail-pa0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755281AbaCKSk2 (ORCPT ); Tue, 11 Mar 2014 14:40:28 -0400 Received: by mail-pa0-f41.google.com with SMTP id fa1so9192112pad.14 for ; Tue, 11 Mar 2014 11:40:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-type:content-transfer-encoding; bh=3SLxWo5EDwOOAXZ7iwIsHCrBbdw0VudJV6dQi1fyaNU=; b=LzHoKxMNGt2LEEFwVr/5LrNPlc4VmXaoptMHyZfSpbnrNqanVmtjXhRLAgMs6HtKu5 C6XaeQNrD67Xd+k05ik1hEk9452BleYQb20eRkSGj0HgRyCQjb+UXdZSWcYi5tblZQ8Q 8Up4Eb8ncllE+z1gDakkpZ+AepHe0907+B2tA3kKbsaXYoCLIh3lVB2eItYj+IyhoFkC dgoRrQTHp71PbToWx3osvmTcnZCKouJHK9JzyMnPj/KwOhZomOvUOwlErIc/s8fjDGxf PhWPxTrUUvxH5G9ZK2ZDDQrXYSdRLf4aFHwH9Rkf9tRLIbarC1xp3N/pYDShi8Ud1kFl Ccxg== X-Gm-Message-State: ALoCoQkTuUkR+AQEyIN+NSwld/Ep1y5GIZxhtGUsPLA3xSTaae1Da6VMmKPp1CvfEPDrsLWUbO+y X-Received: by 10.66.9.41 with SMTP id w9mr48751204paa.39.1394563227529; Tue, 11 Mar 2014 11:40:27 -0700 (PDT) Received: from localhost (cpe-76-93-135-111.san.res.rr.com. [76.93.135.111]) by mx.google.com with ESMTPSA id yk4sm72127414pbc.16.2014.03.11.11.40.24 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Tue, 11 Mar 2014 11:40:26 -0700 (PDT) From: Sebastian Capella To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linaro-kernel@lists.linaro.org, linux-arm-kernel@lists.infradead.org Cc: Russ Dill , "Rafael J. Wysocki" , Sebastian Capella , Russell King , Len Brown , Nicolas Pitre , Santosh Shilimkar , Will Deacon , Jonathan Austin , Catalin Marinas , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Stephen Boyd , Laura Abbott , Jiang Liu , Sricharan R , Victor Kamensky , Stefano Stabellini , Ben Dooks Subject: [PATCH v8 2/2] ARM hibernation / suspend-to-disk Date: Tue, 11 Mar 2014 11:40:14 -0700 Message-Id: <1394563214-26007-3-git-send-email-sebastian.capella@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1394563214-26007-1-git-send-email-sebastian.capella@linaro.org> References: <1394563214-26007-1-git-send-email-sebastian.capella@linaro.org> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, T_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 From: Russ Dill Enable hibernation for ARM architectures and provide ARM architecture specific calls used during hibernation. The swsusp hibernation framework depends on the platform first having functional suspend/resume. Then, in order to enable hibernation on a given platform, a platform_hibernation_ops structure may need to be registered with the system in order to save/restore any SoC-specific / cpu specific state needing (re)init over a suspend-to-disk/resume-from-disk cycle. For example: - "secure" SoCs that have different sets of control registers and/or different CR reg access patterns. - SoCs with L2 caches as the activation sequence there is SoC-dependent; a full off-on cycle for L2 is not done by the hibernation support code. - SoCs requiring steps on wakeup _before_ the "generic" parts done by cpu_suspend / cpu_resume can work correctly. - SoCs having persistent state which is maintained during suspend and resume, but will be lost during the power off cycle after suspend-to-disk. This is a rebase/rework of Frank Hofmann's v5 hibernation patchset. Acked-by: Russ Dill Cc: "Rafael J. Wysocki" Signed-off-by: Sebastian Capella Acked-by: Pavel Machek Reviewed-by: Lorenzo Pieralisi Cc: Russell King Cc: Len Brown Cc: Nicolas Pitre Cc: Santosh Shilimkar Cc: Will Deacon Cc: Jonathan Austin Cc: Catalin Marinas Cc: "Uwe Kleine-König" Cc: Stephen Boyd Cc: Laura Abbott Cc: Jiang Liu Cc: Sricharan R Cc: Victor Kamensky Cc: Stefano Stabellini Cc: Ben Dooks --- arch/arm/kernel/Makefile | 1 + arch/arm/kernel/hibernate.c | 107 +++++++++++++++++++++++++++++++++++++++++++ arch/arm/mm/Kconfig | 5 ++ include/linux/suspend.h | 2 + 4 files changed, 115 insertions(+) create mode 100644 arch/arm/kernel/hibernate.c diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index a30fc9b..8afa848 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -39,6 +39,7 @@ obj-$(CONFIG_ARTHUR) += arthur.o obj-$(CONFIG_ISA_DMA) += dma-isa.o obj-$(CONFIG_PCI) += bios32.o isa.o obj-$(CONFIG_ARM_CPU_SUSPEND) += sleep.o suspend.o +obj-$(CONFIG_HIBERNATION) += hibernate.o obj-$(CONFIG_SMP) += smp.o ifdef CONFIG_MMU obj-$(CONFIG_SMP) += smp_tlb.o diff --git a/arch/arm/kernel/hibernate.c b/arch/arm/kernel/hibernate.c new file mode 100644 index 0000000..036293d --- /dev/null +++ b/arch/arm/kernel/hibernate.c @@ -0,0 +1,107 @@ +/* + * Hibernation support specific for ARM + * + * Derived from work on ARM hibernation support by: + * + * Ubuntu project, hibernation support for mach-dove + * Copyright (C) 2010 Nokia Corporation (Hiroshi Doyu) + * Copyright (C) 2010 Texas Instruments, Inc. (Teerth Reddy et al.) + * https://lkml.org/lkml/2010/6/18/4 + * https://lists.linux-foundation.org/pipermail/linux-pm/2010-June/027422.html + * https://patchwork.kernel.org/patch/96442/ + * + * Copyright (C) 2006 Rafael J. Wysocki + * + * License terms: GNU General Public License (GPL) version 2 + */ + +#include +#include +#include +#include +#include +#include + +extern const void __nosave_begin, __nosave_end; + +int pfn_is_nosave(unsigned long pfn) +{ + unsigned long nosave_begin_pfn = __phys_to_pfn(__pa(&__nosave_begin)); + unsigned long nosave_end_pfn = __phys_to_pfn(__pa(&__nosave_end - 1)); + + return (pfn >= nosave_begin_pfn) && (pfn <= nosave_end_pfn); +} + +void notrace save_processor_state(void) +{ + WARN_ON(num_online_cpus() != 1); + local_fiq_disable(); +} + +void notrace restore_processor_state(void) +{ + local_fiq_enable(); +} + +/* + * Snapshot kernel memory and reset the system. + * + * swsusp_save() is executed in the suspend finisher so that the CPU + * context pointer and memory are part of the saved image, which is + * required by the resume kernel image to restart execution from + * swsusp_arch_suspend(). + * + * soft_restart is not technically needed, but is used to get success + * returned from cpu_suspend. + * + * When soft reboot completes, the hibernation snapshot is written out. + */ +static int notrace arch_save_image(unsigned long unused) +{ + int ret; + + ret = swsusp_save(); + if (ret == 0) + soft_restart(virt_to_phys(cpu_resume)); + return ret; +} + +/* + * Save the current CPU state before suspend / poweroff. + */ +int notrace swsusp_arch_suspend(void) +{ + return cpu_suspend(0, arch_save_image); +} + +/* + * Restore page contents for physical pages that were in use during loading + * hibernation image. Switch to idmap_pgd so the physical page tables + * are overwritten with the same contents. + */ +static void notrace arch_restore_image(void *unused) +{ + struct pbe *pbe; + + cpu_switch_mm(idmap_pgd, &init_mm); + for (pbe = restore_pblist; pbe; pbe = pbe->next) + copy_page(pbe->orig_address, pbe->address); + + soft_restart(virt_to_phys(cpu_resume)); +} + +static u64 resume_stack[PAGE_SIZE/2/sizeof(u64)] __nosavedata; + +/* + * Resume from the hibernation image. + * Due to the kernel heap / data restore, stack contents change underneath + * and that would make function calls impossible; switch to a temporary + * stack within the nosave region to avoid that problem. + */ +int swsusp_arch_resume(void) +{ + extern void call_with_stack(void (*fn)(void *), void *arg, void *sp); + call_with_stack(arch_restore_image, 0, + resume_stack + ARRAY_SIZE(resume_stack)); + return 0; +} diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 1f8fed9..83707702 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -611,6 +611,11 @@ config CPU_USE_DOMAINS config IO_36 bool +config ARCH_HIBERNATION_POSSIBLE + bool + depends on MMU + default y if CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || CPU_XSCALE || CPU_XSC3 || CPU_V6 || CPU_V6K || CPU_V7 + comment "Processor Features" config ARM_LPAE diff --git a/include/linux/suspend.h b/include/linux/suspend.h index f73cabf..38bbf95 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -320,6 +320,8 @@ extern unsigned long get_safe_page(gfp_t gfp_mask); extern void hibernation_set_ops(const struct platform_hibernation_ops *ops); extern int hibernate(void); extern bool system_entering_hibernation(void); +asmlinkage int swsusp_save(void); +extern struct pbe *restore_pblist; #else /* CONFIG_HIBERNATION */ static inline void register_nosave_region(unsigned long b, unsigned long e) {} static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}