mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Rashika](/assets/img/avatar_default.png)
Include header file internal.h in nvs.c because functions suspend_nvs_free(), suspend_nvs_alloc(), suspend_nvs_save() and suspend_nvs_restore() have their prototype declaration in internal.h. This eliminates the following warnings in nvs.c: drivers/acpi/nvs.c:128:6: warning: no previous prototype for ‘suspend_nvs_free’ [-Wmissing-prototypes] drivers/acpi/nvs.c:152:5: warning: no previous prototype for ‘suspend_nvs_alloc’ [-Wmissing-prototypes] drivers/acpi/nvs.c:169:5: warning: no previous prototype for ‘suspend_nvs_save’ [-Wmissing-prototypes] drivers/acpi/nvs.c:201:6: warning: no previous prototype for ‘suspend_nvs_restore’ [-Wmissing-prototypes] Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
212 lines
4.6 KiB
C
212 lines
4.6 KiB
C
/*
|
|
* nvs.c - Routines for saving and restoring ACPI NVS memory region
|
|
*
|
|
* Copyright (C) 2008-2011 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/acpi.h>
|
|
|
|
#include "internal.h"
|
|
|
|
/* ACPI NVS regions, APEI may use it */
|
|
|
|
struct nvs_region {
|
|
__u64 phys_start;
|
|
__u64 size;
|
|
struct list_head node;
|
|
};
|
|
|
|
static LIST_HEAD(nvs_region_list);
|
|
|
|
#ifdef CONFIG_ACPI_SLEEP
|
|
static int suspend_nvs_register(unsigned long start, unsigned long size);
|
|
#else
|
|
static inline int suspend_nvs_register(unsigned long a, unsigned long b)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int acpi_nvs_register(__u64 start, __u64 size)
|
|
{
|
|
struct nvs_region *region;
|
|
|
|
region = kmalloc(sizeof(*region), GFP_KERNEL);
|
|
if (!region)
|
|
return -ENOMEM;
|
|
region->phys_start = start;
|
|
region->size = size;
|
|
list_add_tail(®ion->node, &nvs_region_list);
|
|
|
|
return suspend_nvs_register(start, size);
|
|
}
|
|
|
|
int acpi_nvs_for_each_region(int (*func)(__u64 start, __u64 size, void *data),
|
|
void *data)
|
|
{
|
|
int rc;
|
|
struct nvs_region *region;
|
|
|
|
list_for_each_entry(region, &nvs_region_list, node) {
|
|
rc = func(region->phys_start, region->size, data);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_ACPI_SLEEP
|
|
/*
|
|
* 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;
|
|
bool unmap;
|
|
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.
|
|
*/
|
|
static int suspend_nvs_register(unsigned long start, unsigned long size)
|
|
{
|
|
struct nvs_page *entry, *next;
|
|
|
|
pr_info("PM: Registering ACPI NVS region [mem %#010lx-%#010lx] (%ld bytes)\n",
|
|
start, start + size - 1, size);
|
|
|
|
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) {
|
|
if (entry->unmap) {
|
|
iounmap(entry->kaddr);
|
|
entry->unmap = false;
|
|
} else {
|
|
acpi_os_unmap_memory(entry->kaddr,
|
|
entry->size);
|
|
}
|
|
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) {
|
|
unsigned long phys = entry->phys_start;
|
|
unsigned int size = entry->size;
|
|
|
|
entry->kaddr = acpi_os_get_iomem(phys, size);
|
|
if (!entry->kaddr) {
|
|
entry->kaddr = acpi_os_ioremap(phys, size);
|
|
entry->unmap = !!entry->kaddr;
|
|
}
|
|
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);
|
|
}
|
|
#endif
|