From patchwork Tue Feb 25 00:27:39 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sebastian Capella X-Patchwork-Id: 323803 Return-Path: X-Original-To: incoming-imx@patchwork.ozlabs.org Delivered-To: patchwork-incoming-imx@bilbo.ozlabs.org Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:770:15f::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id DB79B2C0227 for ; Tue, 25 Feb 2014 11:30:45 +1100 (EST) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WI5tV-0004Ob-Vs; Tue, 25 Feb 2014 00:29:11 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WI5tB-0007hr-E3; Tue, 25 Feb 2014 00:28:49 +0000 Received: from mail-pa0-f50.google.com ([209.85.220.50]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WI5sh-0007ca-L1 for linux-arm-kernel@lists.infradead.org; Tue, 25 Feb 2014 00:28:22 +0000 Received: by mail-pa0-f50.google.com with SMTP id kp14so7324526pab.37 for ; Mon, 24 Feb 2014 16:27:58 -0800 (PST) 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=cwoFGriU+qJNHvcN8iRU4W8OLsL3NyCbH6iJ94MFrP0=; b=iWEC6B1mWunJw87D2sm/5Dl2zEHFcAroCjWzliLHkmmYdyC63ELt85R8ohqOKXWGqP XLI6KO8fYG4kWsCQgesnAoZC/I2BZQx3y0Bo45qawr5GqJ0ac1ieHJokPHwYaRfI7C1x qdtYAjDF0ll99Zq6cfRHiovZpjxMNeGysmcAXhrYyLXAXK4zqBF58msdQsVBg126O4xg Oxp+GJau2o4ViQv1hY01hDkcp8Hxx8PZ7ZSJrrUqbNqYH9cekFYhp1b7i6hkmPDY/c9o SuBdXl4rEpjTuOwKiIqejP7szfF2KhangdMN7cwZ0QyUb/EPHY0d6OJTt53qqnZDQ32N B5dQ== X-Gm-Message-State: ALoCoQkE+MvKl64gsClIP7XgdYqxM/mQRPmktP5AX75a2KQk+j5QR6GKKSJU5tiYMb7FmZwgulYg X-Received: by 10.68.113.68 with SMTP id iw4mr2704011pbb.119.1393288077463; Mon, 24 Feb 2014 16:27:57 -0800 (PST) Received: from localhost (cpe-76-93-135-111.san.res.rr.com. [76.93.135.111]) by mx.google.com with ESMTPSA id ns7sm4041390pbc.32.2014.02.24.16.27.54 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Mon, 24 Feb 2014 16:27:56 -0800 (PST) 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 Subject: [PATCH v2 3/3] ARM hibernation / suspend-to-disk Date: Mon, 24 Feb 2014 16:27:39 -0800 Message-Id: <1393288059-18174-4-git-send-email-sebastian.capella@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1393288059-18174-1-git-send-email-sebastian.capella@linaro.org> References: <1393288059-18174-1-git-send-email-sebastian.capella@linaro.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140224_192819_937074_EBEDA1F0 X-CRM114-Status: GOOD ( 22.34 ) X-Spam-Score: 0.5 (/) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (0.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.220.50 listed in list.dnswl.org] 3.1 KHOP_BIG_TO_CC Sent to 10+ recipients instaed of Bcc or a list -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Len Brown , Russell King , Jonathan Austin , Nicolas Pitre , Will Deacon , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , "Rafael J. Wysocki" , Russ Dill , Sebastian Capella , Pavel Machek , Catalin Marinas , Santosh Shilimkar , Stephen Boyd X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org List-Id: linux-imx-kernel.lists.patchwork.ozlabs.org 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. Cc: Russ Dill Cc: "Rafael J. Wysocki" Signed-off-by: Sebastian Capella Cc: Russell King Cc: Len Brown Cc: Pavel Machek Cc: Nicolas Pitre Cc: Santosh Shilimkar Cc: Will Deacon Cc: Jonathan Austin Cc: Catalin Marinas Cc: "Uwe Kleine-König" Cc: Stephen Boyd --- arch/arm/include/asm/memory.h | 1 + arch/arm/kernel/Makefile | 1 + arch/arm/kernel/hibernate.c | 104 +++++++++++++++++++++++++++++++++++++++++ arch/arm/mm/Kconfig | 5 ++ include/linux/suspend.h | 2 + 5 files changed, 113 insertions(+) create mode 100644 arch/arm/kernel/hibernate.c diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index 8756e4b..1079ea8 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -291,6 +291,7 @@ static inline void *phys_to_virt(phys_addr_t x) */ #define __pa(x) __virt_to_phys((unsigned long)(x)) #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) +#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x); 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..74bfa8b --- /dev/null +++ b/arch/arm/kernel/hibernate.c @@ -0,0 +1,104 @@ +/* + * 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 +#include + +extern const void __nosave_begin, __nosave_end; + +int pfn_is_nosave(unsigned long pfn) +{ + unsigned long nosave_begin_pfn = + __pa_symbol(&__nosave_begin) >> PAGE_SHIFT; + unsigned long nosave_end_pfn = + PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT; + + 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. + * After resume, the hibernation snapshot is written out. + */ +static int notrace __swsusp_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, __swsusp_arch_save_image); +} + +/* + * The framework loads the hibernation image into a linked list anchored + * at restore_pblist, for swsusp_arch_resume() to copy back to the proper + * destinations. + * + * To make this work if resume is triggered from initramfs, the + * pagetables need to be switched to allow writes to kernel mem. + */ +static void notrace __swsusp_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_noirq(virt_to_phys(cpu_resume)); +} + +static u8 __swsusp_resume_stk[PAGE_SIZE/2] __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(__swsusp_arch_restore_image, 0, + __swsusp_resume_stk + sizeof(__swsusp_resume_stk)); + 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) {}