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

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>

1 files changed, 95 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index 655b9192eeb3..b8d5116d7371 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -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;