[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>

1 files changed, 106 insertions, 0 deletions

diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index dd6b0e3386c..e6023970aa4 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -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