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[PATCH] swsusp: x86_64 mark special saveable/unsaveable pages

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Pages (Reserved/ACPI NVS/ACPI Data) below end_pfn will be saved/restored by S4
currently.  We should mark 'Reserved' pages not saveable.

Pages (Reserved/ACPI NVS/ACPI Data) above end_pfn will not be saved/restored
by S4 currently.  We should save the 'ACPI NVS/ACPI Data' pages.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Nigel Cunningham <nigel@suspend2.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Shaohua Li 2006-06-23 02:04:46 -07:00 committed by Linus Torvalds
parent b6370d96e0
commit 3e3318dee0
1 changed files with 95 additions and 0 deletions
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95
arch/x86_64/kernel/setup.c
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@ -47,6 +47,7 @@
#include <linux/dmi.h>
#include <linux/dma-mapping.h>
#include <linux/ctype.h>
#include <linux/suspend.h>
#include <asm/mtrr.h>
#include <asm/uaccess.h>
@ -595,6 +596,100 @@ static void discover_ebda(void)
ebda_size = 64*1024;
}
#ifdef CONFIG_SOFTWARE_SUSPEND
static void __init mark_nosave_page_range(unsigned long start, unsigned long end)
{
struct page *page;
while (start <= end) {
page = pfn_to_page(start);
SetPageNosave(page);
start++;
}
}
static void __init e820_nosave_reserved_pages(void)
{
int i;
unsigned long r_start = 0, r_end = 0;
/* Assume e820 map is sorted */
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
unsigned long start, end;
start = round_down(ei->addr, PAGE_SIZE);
end = round_up(ei->addr + ei->size, PAGE_SIZE);
if (start >= end)
continue;
if (ei->type == E820_RESERVED)
continue;
r_end = start>>PAGE_SHIFT;
/* swsusp ignores invalid pfn, ignore these pages here */
if (r_end > end_pfn)
r_end = end_pfn;
if (r_end > r_start)
mark_nosave_page_range(r_start, r_end-1);
if (r_end >= end_pfn)
break;
r_start = end>>PAGE_SHIFT;
}
}
static void __init e820_save_acpi_pages(void)
{
int i;
/* Assume e820 map is sorted */
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
unsigned long start, end;
start = ei->addr, PAGE_SIZE;
end = ei->addr + ei->size;
if (start >= end)
continue;
if (ei->type != E820_ACPI && ei->type != E820_NVS)
continue;
/*
* If the region is below end_pfn, it will be
* saved/restored by swsusp follow 'RAM' type.
*/
if (start < (end_pfn << PAGE_SHIFT))
start = end_pfn << PAGE_SHIFT;
if (end > start)
swsusp_add_arch_pages(start, end);
}
}
extern char __start_rodata, __end_rodata;
/*
* BIOS reserved region/hole - no save/restore
* ACPI NVS - save/restore
* ACPI Data - this is a little tricky, the mem could be used by OS after OS
* reads tables from the region, but anyway save/restore the memory hasn't any
* side effect and Linux runtime module load/unload might use it.
* kernel rodata - no save/restore (kernel rodata isn't changed)
*/
static int __init mark_nosave_pages(void)
{
unsigned long pfn_start, pfn_end;
/* BIOS reserved regions & holes */
e820_nosave_reserved_pages();
/* kernel rodata */
pfn_start = round_up(__pa_symbol(&__start_rodata), PAGE_SIZE) >> PAGE_SHIFT;
pfn_end = round_down(__pa_symbol(&__end_rodata), PAGE_SIZE) >> PAGE_SHIFT;
mark_nosave_page_range(pfn_start, pfn_end-1);
/* record ACPI Data/NVS as saveable */
e820_save_acpi_pages();
return 0;
}
core_initcall(mark_nosave_pages);
#endif
void __init setup_arch(char **cmdline_p)
{
unsigned long kernel_end;