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[PATCH] swsusp: i386 mark special saveable/unsaveable pages 

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

Pages (Reserved/ACPI NVS/ACPI Data) above max_low_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 02:04:45 -07:00 committed by Linus Torvalds
parent ce4ab0012b
commit b6370d96e0
1 changed files with 106 additions and 0 deletions
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106
arch/i386/kernel/setup.c
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@ -48,6 +48,7 @@
#include <linux/crash_dump.h>
#include <linux/dmi.h>
#include <linux/pfn.h>
#include <linux/suspend.h>
#include <video/edid.h>
@ -1434,6 +1435,111 @@ static void set_mca_bus(int x)
static void set_mca_bus(int x) { }
#endif
#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 = PFN_DOWN(ei->addr);
end = PFN_UP(ei->addr + ei->size);
if (start >= end)
continue;
if (ei->type == E820_RESERVED)
continue;
r_end = start;
/*
* Highmem 'Reserved' pages are marked as reserved, swsusp
* will not save/restore them, so we ignore these pages here.
*/
if (r_end > max_low_pfn)
r_end = max_low_pfn;
if (r_end > r_start)
mark_nosave_page_range(r_start, r_end-1);
if (r_end >= max_low_pfn)
break;
r_start = end;
}
}
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;
end = ei->addr + ei->size;
if (start >= end)
continue;
if (ei->type != E820_ACPI && ei->type != E820_NVS)
continue;
/*
* If the region is below max_low_pfn, it will be
* saved/restored by swsusp follow 'RAM' type.
*/
if (start < (max_low_pfn << PAGE_SHIFT))
start = max_low_pfn << PAGE_SHIFT;
/*
* Highmem pages (ACPI NVS/Data) are reserved, but swsusp
* highmem save/restore will not save/restore them. We marked
* them as arch saveable pages here
*/
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;
/* FIXME: provide a version for efi BIOS */
if (efi_enabled)
return 0;
/* BIOS reserved regions & holes */
e820_nosave_reserved_pages();
/* kernel rodata */
pfn_start = PFN_UP(virt_to_phys(&__start_rodata));
pfn_end = PFN_DOWN(virt_to_phys(&__end_rodata));
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
/*
* Determine if we were loaded by an EFI loader. If so, then we have also been
* passed the efi memmap, systab, etc., so we should use these data structures