The patch titled
Subject: x86, mirror: x86 enabling - find mirrored memory ranges
has been added to the -mm tree. Its filename is
x86-mirror-x86-enabling-find-mirrored-memory-ranges.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/x86-mirror-x86-enabling-find-mirrored-memory-ranges.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/x86-mirror-x86-enabling-find-mirrored-memory-ranges.patch
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------------------------------------------------------
From: Tony Luck <tony.luck@xxxxxxxxx>
Subject: x86, mirror: x86 enabling - find mirrored memory ranges
UEFI GetMemoryMap() uses a new attribute bit to mark mirrored memory
address ranges. See UEFI 2.5 spec pages 157-158:
http://www.uefi.org/sites/default/files/resources/UEFI%202_5.pdf
On EFI enabled systems scan the memory map and tell memblock about any
mirrored ranges.
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Cc: Hanjun Guo <guohanjun@xxxxxxxxxx>
Cc: Xiexiuqi <xiexiuqi@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Naoya Horiguchi <nao.horiguchi@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/setup.c | 3 +++
arch/x86/platform/efi/efi.c | 21 +++++++++++++++++++++
include/linux/efi.h | 3 +++
3 files changed, 27 insertions(+)
diff -puN arch/x86/kernel/setup.c~x86-mirror-x86-enabling-find-mirrored-memory-ranges arch/x86/kernel/setup.c
--- a/arch/x86/kernel/setup.c~x86-mirror-x86-enabling-find-mirrored-memory-ranges
+++ a/arch/x86/kernel/setup.c
@@ -1103,6 +1103,9 @@ void __init setup_arch(char **cmdline_p)
memblock_set_current_limit(ISA_END_ADDRESS);
memblock_x86_fill();
+ if (efi_enabled(EFI_BOOT))
+ efi_find_mirror();
+
/*
* The EFI specification says that boot service code won't be called
* after ExitBootServices(). This is, in fact, a lie.
diff -puN arch/x86/platform/efi/efi.c~x86-mirror-x86-enabling-find-mirrored-memory-ranges arch/x86/platform/efi/efi.c
--- a/arch/x86/platform/efi/efi.c~x86-mirror-x86-enabling-find-mirrored-memory-ranges
+++ a/arch/x86/platform/efi/efi.c
@@ -117,6 +117,27 @@ void efi_get_time(struct timespec *now)
now->tv_nsec = 0;
}
+void __init efi_find_mirror(void)
+{
+ void *p;
+ u64 mirror_size = 0, total_size = 0;
+
+ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
+ efi_memory_desc_t *md = p;
+ unsigned long long start = md->phys_addr;
+ unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
+
+ total_size += size;
+ if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
+ memblock_mark_mirror(start, size);
+ mirror_size += size;
+ }
+ }
+ if (mirror_size)
+ pr_info("Memory: %lldM/%lldM mirrored memory\n",
+ mirror_size>>20, total_size>>20);
+}
+
/*
* Tell the kernel about the EFI memory map. This might include
* more than the max 128 entries that can fit in the e820 legacy
diff -puN include/linux/efi.h~x86-mirror-x86-enabling-find-mirrored-memory-ranges include/linux/efi.h
--- a/include/linux/efi.h~x86-mirror-x86-enabling-find-mirrored-memory-ranges
+++ a/include/linux/efi.h
@@ -96,6 +96,8 @@ typedef struct {
#define EFI_MEMORY_WP ((u64)0x0000000000001000ULL) /* write-protect */
#define EFI_MEMORY_RP ((u64)0x0000000000002000ULL) /* read-protect */
#define EFI_MEMORY_XP ((u64)0x0000000000004000ULL) /* execute-protect */
+#define EFI_MEMORY_MORE_RELIABLE \
+ ((u64)0x0000000000010000ULL) /* higher reliability */
#define EFI_MEMORY_RUNTIME ((u64)0x8000000000000000ULL) /* range requires runtime mapping */
#define EFI_MEMORY_DESCRIPTOR_VERSION 1
@@ -864,6 +866,7 @@ extern void efi_enter_virtual_mode (void
extern void efi_late_init(void);
extern void efi_free_boot_services(void);
extern efi_status_t efi_query_variable_store(u32 attributes, unsigned long size);
+extern void efi_find_mirror(void);
#else
static inline void efi_late_init(void) {}
static inline void efi_free_boot_services(void) {}
_
Patches currently in -mm which might be from tony.luck@xxxxxxxxx are
mm-hugetlb-reduce-arch-dependent-code-about-huge_pmd_unshare.patch
memblock-introduce-a-for_each_reserved_mem_region-iterator.patch
mm-meminit-move-page-initialization-into-a-separate-function.patch
mm-meminit-only-set-page-reserved-in-the-memblock-region.patch
mm-page_alloc-pass-pfn-to-__free_pages_bootmem.patch
mm-meminit-make-__early_pfn_to_nid-smp-safe-and-introduce-meminit_pfn_in_nid.patch
mm-meminit-inline-some-helper-functions.patch
mm-meminit-initialise-a-subset-of-struct-pages-if-config_deferred_struct_page_init-is-set.patch
mm-meminit-initialise-remaining-struct-pages-in-parallel-with-kswapd.patch
mm-meminit-minimise-number-of-pfn-page-lookups-during-initialisation.patch
x86-mm-enable-deferred-struct-page-initialisation-on-x86-64.patch
mm-meminit-free-pages-in-large-chunks-where-possible.patch
mm-meminit-reduce-number-of-times-pageblocks-are-set-during-struct-page-init.patch
mm-meminit-remove-mminit_verify_page_links.patch
mm-memory-failure-split-thp-earlier-in-memory-error-handling.patch
mm-memory-failure-introduce-get_hwpoison_page-for-consistent-refcount-handling.patch
mm-soft-offline-dont-free-target-page-in-successful-page-migration.patch
mm-memory-failure-me_huge_page-does-nothing-for-thp.patch
memory-failure-export-page_type-and-action-result.patch
memory-failure-change-type-of-action_results-param-3-to-enum.patch
tracing-add-trace-event-for-memory-failure.patch
tracing-add-trace-event-for-memory-failure-fix.patch
mm-memblock-add-extra-flags-to-memblock-to-allow-selection-of-memory-based-on-attribute.patch
mm-memblock-allocate-boot-time-data-structures-from-mirrored-memory.patch
x86-mirror-x86-enabling-find-mirrored-memory-ranges.patch
linux-next.patch
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