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authorRafael J. Wysocki <rjw@sisk.pl>2011-01-07 01:43:44 +0100
committerLen Brown <len.brown@intel.com>2011-01-07 00:36:55 -0500
commit976513dbfc1547c7b1822566923058655f0c32fd (patch)
tree561e658e65a0136691cc9faebbe1ddf17a3429d3 /kernel/power
parent26fcaf60fe3861409eb4c455c5c0d0f00f599b08 (diff)
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PM / ACPI: Move NVS saving and restoring code to drivers/acpi
The saving of the ACPI NVS area during hibernation and suspend and restoring it during the subsequent resume is entirely specific to ACPI, so move it to drivers/acpi and drop the CONFIG_SUSPEND_NVS configuration option which is redundant. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/Kconfig5
-rw-r--r--kernel/power/Makefile1
-rw-r--r--kernel/power/nvs.c142
3 files changed, 0 insertions, 148 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index a5aff3e..2657299 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -100,13 +100,9 @@ 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
@@ -140,7 +136,6 @@ config HIBERNATION
depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
select LZO_COMPRESS
select LZO_DECOMPRESS
- 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 f9063c6..120a158 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -10,6 +10,5 @@ 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_SUSPEND_NVS) += nvs.o
obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
diff --git a/kernel/power/nvs.c b/kernel/power/nvs.c
deleted file mode 100644
index 57c6fab..0000000
--- a/kernel/power/nvs.c
+++ /dev/null
@@ -1,142 +0,0 @@
-/*
- * linux/kernel/power/hibernate_nvs.c - Routines for handling NVS memory
- *
- * Copyright (C) 2008,2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
- *
- * This file is released under the GPLv2.
- */
-
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/suspend.h>
-
-/*
- * 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
- */
-int 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);
- if (!entry->kaddr) {
- suspend_nvs_free();
- return -ENOMEM;
- }
- memcpy(entry->data, entry->kaddr, entry->size);
- }
-
- return 0;
-}
-
-/**
- * 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);
-}