From patchwork Tue Jun 1 18:22:23 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 103587 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o51IMdgE020749 for ; Tue, 1 Jun 2010 18:22:39 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751585Ab0FASWi (ORCPT ); Tue, 1 Jun 2010 14:22:38 -0400 Received: from mail-fx0-f46.google.com ([209.85.161.46]:33775 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751091Ab0FASWi (ORCPT ); Tue, 1 Jun 2010 14:22:38 -0400 Received: by fxm8 with SMTP id 8so1231034fxm.19 for ; Tue, 01 Jun 2010 11:22:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:to:cc:subject:date :message-id:x-mailer:in-reply-to:references; bh=RVJL5uDcUVK5ZOC/l96D1Uj8W4wv8hAUjt/dQi6stMA=; b=rZfmsjVCAL+4ilSUvTWbkmlkf80XU0lVkKQgSO/IjAcqJy6h5kVY26Y5oLPQXLUelN P+y+yIZSXdvEY/XHAAk0+ul2CDojCOkFOzyDfZNTQuiNRVJHYy6LA6WFw+h9cOyeU5sw nCndxPkoMJEOJh6axDXkGsUifIYyK9kSj8PCA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=LeOUSwsSmgCqSay7cQbfctgy8o+G1TamoWNlxa+Q/jvXDyqgEJmYjodMfFXcsv6yPw 7QEzMIAStiUtiFyIdHwuCQAmXLR0ukrBtVM6VzOfAqjcDtkENgvF48asLxDBBUsgweeI rhT9cvGOsEB4oaf6HJvooKAjRAn2HlnpYhJtY= Received: by 10.223.63.17 with SMTP id z17mr7469598fah.66.1275416554534; Tue, 01 Jun 2010 11:22:34 -0700 (PDT) Received: from localhost.localdomain ([77.127.199.160]) by mx.google.com with ESMTPS id g10sm48248722fai.0.2010.06.01.11.22.28 (version=SSLv3 cipher=RC4-MD5); Tue, 01 Jun 2010 11:22:29 -0700 (PDT) From: Maxim Levitsky To: "linux-acpi@vger.kernel.org" Cc: linux-pm , Matthew Garrett , "Rafael J. Wysocki" , Alan Stern , Maxim Levitsky Subject: [PATCH 1/2] suspend: Move NVS save/restore code to generic suspend functionality Date: Tue, 1 Jun 2010 21:22:23 +0300 Message-Id: <1275416544-4515-1-git-send-email-maximlevitsky@gmail.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1275416390.3778.7.camel@maxim-laptop> References: <1275416390.3778.7.camel@maxim-laptop> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Tue, 01 Jun 2010 18:22:40 +0000 (UTC) diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 7bca3c6..0d6fc71 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -729,7 +729,7 @@ static int __init e820_mark_nvs_memory(void) struct e820entry *ei = &e820.map[i]; if (ei->type == E820_NVS) - hibernate_nvs_register(ei->addr, ei->size); + suspend_nvs_register(ei->addr, ei->size); } return 0; diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index 3fb4bde..bdb306f 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -404,7 +404,7 @@ static int acpi_hibernation_begin(void) { int error; - error = s4_no_nvs ? 0 : hibernate_nvs_alloc(); + error = s4_no_nvs ? 0 : suspend_nvs_alloc(); if (!error) { acpi_target_sleep_state = ACPI_STATE_S4; acpi_sleep_tts_switch(acpi_target_sleep_state); @@ -418,7 +418,7 @@ static int acpi_hibernation_pre_snapshot(void) int error = acpi_pm_prepare(); if (!error) - hibernate_nvs_save(); + suspend_nvs_save(); return error; } @@ -443,7 +443,7 @@ static int acpi_hibernation_enter(void) static void acpi_hibernation_finish(void) { - hibernate_nvs_free(); + suspend_nvs_free(); acpi_ec_unblock_transactions(); acpi_pm_finish(); } @@ -464,7 +464,7 @@ static void acpi_hibernation_leave(void) panic("ACPI S4 hardware signature mismatch"); } /* Restore the NVS memory area */ - hibernate_nvs_restore(); + suspend_nvs_restore(); /* Allow EC transactions to happen. */ acpi_ec_unblock_transactions_early(); } @@ -507,7 +507,7 @@ static int acpi_hibernation_begin_old(void) if (!error) { if (!s4_no_nvs) - error = hibernate_nvs_alloc(); + error = suspend_nvs_alloc(); if (!error) acpi_target_sleep_state = ACPI_STATE_S4; } @@ -517,7 +517,7 @@ static int acpi_hibernation_begin_old(void) static int acpi_hibernation_pre_snapshot_old(void) { acpi_pm_freeze(); - hibernate_nvs_save(); + suspend_nvs_save(); return 0; } diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 5e781d8..bc7d6bb 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -256,22 +256,22 @@ static inline int hibernate(void) { return -ENOSYS; } static inline bool system_entering_hibernation(void) { return false; } #endif /* CONFIG_HIBERNATION */ -#ifdef CONFIG_HIBERNATION_NVS -extern int hibernate_nvs_register(unsigned long start, unsigned long size); -extern int hibernate_nvs_alloc(void); -extern void hibernate_nvs_free(void); -extern void hibernate_nvs_save(void); -extern void hibernate_nvs_restore(void); -#else /* CONFIG_HIBERNATION_NVS */ -static inline int hibernate_nvs_register(unsigned long a, unsigned long b) +#ifdef CONFIG_SUSPEND_NVS +extern int suspend_nvs_register(unsigned long start, unsigned long size); +extern int suspend_nvs_alloc(void); +extern void suspend_nvs_free(void); +extern void suspend_nvs_save(void); +extern void suspend_nvs_restore(void); +#else /* CONFIG_SUSPEND_NVS */ +static inline int suspend_nvs_register(unsigned long a, unsigned long b) { return 0; } -static inline int hibernate_nvs_alloc(void) { return 0; } -static inline void hibernate_nvs_free(void) {} -static inline void hibernate_nvs_save(void) {} -static inline void hibernate_nvs_restore(void) {} -#endif /* CONFIG_HIBERNATION_NVS */ +static inline int suspend_nvs_alloc(void) { return 0; } +static inline void suspend_nvs_free(void) {} +static inline void suspend_nvs_save(void) {} +static inline void suspend_nvs_restore(void) {} +#endif /* CONFIG_SUSPEND_NVS */ #ifdef CONFIG_PM_SLEEP void save_processor_state(void); diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig index 5c36ea9..ca6066a 100644 --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -99,9 +99,13 @@ config PM_SLEEP_ADVANCED_DEBUG depends on PM_ADVANCED_DEBUG default n +config SUSPEND_NVS + bool + config SUSPEND bool "Suspend to RAM and standby" depends on PM && ARCH_SUSPEND_POSSIBLE + select SUSPEND_NVS if HAS_IOMEM default y ---help--- Allow the system to enter sleep states in which main memory is @@ -130,13 +134,10 @@ config SUSPEND_FREEZER Turning OFF this setting is NOT recommended! If in doubt, say Y. -config HIBERNATION_NVS - bool - config HIBERNATION bool "Hibernation (aka 'suspend to disk')" depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE - select HIBERNATION_NVS if HAS_IOMEM + select SUSPEND_NVS if HAS_IOMEM ---help--- Enable the suspend to disk (STD) functionality, which is usually called "hibernation" in user interfaces. STD checkpoints the diff --git a/kernel/power/Makefile b/kernel/power/Makefile index 524e058..f9063c6 100644 --- a/kernel/power/Makefile +++ b/kernel/power/Makefile @@ -10,6 +10,6 @@ obj-$(CONFIG_SUSPEND) += suspend.o obj-$(CONFIG_PM_TEST_SUSPEND) += suspend_test.o obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o \ block_io.o -obj-$(CONFIG_HIBERNATION_NVS) += hibernate_nvs.o +obj-$(CONFIG_SUSPEND_NVS) += nvs.o obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o diff --git a/kernel/power/hibernate_nvs.c b/kernel/power/hibernate_nvs.c deleted file mode 100644 index fdcad9e..0000000 --- a/kernel/power/hibernate_nvs.c +++ /dev/null @@ -1,136 +0,0 @@ -/* - * linux/kernel/power/hibernate_nvs.c - Routines for handling NVS memory - * - * Copyright (C) 2008,2009 Rafael J. Wysocki , Novell Inc. - * - * This file is released under the GPLv2. - */ - -#include -#include -#include -#include -#include -#include - -/* - * Platforms, like ACPI, may want us to save some memory used by them during - * hibernation and to restore the contents of this memory during the subsequent - * resume. The code below implements a mechanism allowing us to do that. - */ - -struct nvs_page { - unsigned long phys_start; - unsigned int size; - void *kaddr; - void *data; - struct list_head node; -}; - -static LIST_HEAD(nvs_list); - -/** - * hibernate_nvs_register - register platform NVS memory region to save - * @start - physical address of the region - * @size - size of the region - * - * The NVS region need not be page-aligned (both ends) and we arrange - * things so that the data from page-aligned addresses in this region will - * be copied into separate RAM pages. - */ -int hibernate_nvs_register(unsigned long start, unsigned long size) -{ - struct nvs_page *entry, *next; - - while (size > 0) { - unsigned int nr_bytes; - - entry = kzalloc(sizeof(struct nvs_page), GFP_KERNEL); - if (!entry) - goto Error; - - list_add_tail(&entry->node, &nvs_list); - entry->phys_start = start; - nr_bytes = PAGE_SIZE - (start & ~PAGE_MASK); - entry->size = (size < nr_bytes) ? size : nr_bytes; - - start += entry->size; - size -= entry->size; - } - return 0; - - Error: - list_for_each_entry_safe(entry, next, &nvs_list, node) { - list_del(&entry->node); - kfree(entry); - } - return -ENOMEM; -} - -/** - * hibernate_nvs_free - free data pages allocated for saving NVS regions - */ -void hibernate_nvs_free(void) -{ - struct nvs_page *entry; - - list_for_each_entry(entry, &nvs_list, node) - if (entry->data) { - free_page((unsigned long)entry->data); - entry->data = NULL; - if (entry->kaddr) { - iounmap(entry->kaddr); - entry->kaddr = NULL; - } - } -} - -/** - * hibernate_nvs_alloc - allocate memory necessary for saving NVS regions - */ -int hibernate_nvs_alloc(void) -{ - struct nvs_page *entry; - - list_for_each_entry(entry, &nvs_list, node) { - entry->data = (void *)__get_free_page(GFP_KERNEL); - if (!entry->data) { - hibernate_nvs_free(); - return -ENOMEM; - } - } - return 0; -} - -/** - * hibernate_nvs_save - save NVS memory regions - */ -void hibernate_nvs_save(void) -{ - struct nvs_page *entry; - - printk(KERN_INFO "PM: Saving platform NVS memory\n"); - - list_for_each_entry(entry, &nvs_list, node) - if (entry->data) { - entry->kaddr = ioremap(entry->phys_start, entry->size); - memcpy(entry->data, entry->kaddr, entry->size); - } -} - -/** - * hibernate_nvs_restore - restore NVS memory regions - * - * This function is going to be called with interrupts disabled, so it - * cannot iounmap the virtual addresses used to access the NVS region. - */ -void hibernate_nvs_restore(void) -{ - struct nvs_page *entry; - - printk(KERN_INFO "PM: Restoring platform NVS memory\n"); - - list_for_each_entry(entry, &nvs_list, node) - if (entry->data) - memcpy(entry->kaddr, entry->data, entry->size); -} diff --git a/kernel/power/nvs.c b/kernel/power/nvs.c new file mode 100644 index 0000000..30c662f --- /dev/null +++ b/kernel/power/nvs.c @@ -0,0 +1,136 @@ +/* + * linux/kernel/power/nvs.c - Routines for handling NVS memory + * + * Copyright (C) 2008,2009 Rafael J. Wysocki , Novell Inc. + * + * This file is released under the GPLv2. + */ + +#include +#include +#include +#include +#include +#include + +/* + * Platforms, like ACPI, may want us to save some memory used by them during + * suspend and to restore the contents of this memory during the subsequent + * resume. The code below implements a mechanism allowing us to do that. + */ + +struct nvs_page { + unsigned long phys_start; + unsigned int size; + void *kaddr; + void *data; + struct list_head node; +}; + +static LIST_HEAD(nvs_list); + +/** + * suspend_nvs_register - register platform NVS memory region to save + * @start - physical address of the region + * @size - size of the region + * + * The NVS region need not be page-aligned (both ends) and we arrange + * things so that the data from page-aligned addresses in this region will + * be copied into separate RAM pages. + */ +int suspend_nvs_register(unsigned long start, unsigned long size) +{ + struct nvs_page *entry, *next; + + while (size > 0) { + unsigned int nr_bytes; + + entry = kzalloc(sizeof(struct nvs_page), GFP_KERNEL); + if (!entry) + goto Error; + + list_add_tail(&entry->node, &nvs_list); + entry->phys_start = start; + nr_bytes = PAGE_SIZE - (start & ~PAGE_MASK); + entry->size = (size < nr_bytes) ? size : nr_bytes; + + start += entry->size; + size -= entry->size; + } + return 0; + + Error: + list_for_each_entry_safe(entry, next, &nvs_list, node) { + list_del(&entry->node); + kfree(entry); + } + return -ENOMEM; +} + +/** + * suspend_nvs_free - free data pages allocated for saving NVS regions + */ +void suspend_nvs_free(void) +{ + struct nvs_page *entry; + + list_for_each_entry(entry, &nvs_list, node) + if (entry->data) { + free_page((unsigned long)entry->data); + entry->data = NULL; + if (entry->kaddr) { + iounmap(entry->kaddr); + entry->kaddr = NULL; + } + } +} + +/** + * suspend_nvs_alloc - allocate memory necessary for saving NVS regions + */ +int suspend_nvs_alloc(void) +{ + struct nvs_page *entry; + + list_for_each_entry(entry, &nvs_list, node) { + entry->data = (void *)__get_free_page(GFP_KERNEL); + if (!entry->data) { + suspend_nvs_free(); + return -ENOMEM; + } + } + return 0; +} + +/** + * suspend_nvs_save - save NVS memory regions + */ +void suspend_nvs_save(void) +{ + struct nvs_page *entry; + + printk(KERN_INFO "PM: Saving platform NVS memory\n"); + + list_for_each_entry(entry, &nvs_list, node) + if (entry->data) { + entry->kaddr = ioremap(entry->phys_start, entry->size); + memcpy(entry->data, entry->kaddr, entry->size); + } +} + +/** + * suspend_nvs_restore - restore NVS memory regions + * + * This function is going to be called with interrupts disabled, so it + * cannot iounmap the virtual addresses used to access the NVS region. + */ +void suspend_nvs_restore(void) +{ + struct nvs_page *entry; + + printk(KERN_INFO "PM: Restoring platform NVS memory\n"); + + list_for_each_entry(entry, &nvs_list, node) + if (entry->data) + memcpy(entry->kaddr, entry->data, entry->size); +} diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 56e7dbb..f37cb7d 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -16,6 +16,12 @@ #include #include #include +#include +#include +#include +#include +#include +#include #include "power.h"