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linux-sg2042
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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@intel.com>
Cc: Xishi Qiu <qiuxishi@huawei.com>
Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Xiexiuqi <xiexiuqi@huawei.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tony Luck 2015-06-24 16:58:15 -07:00 committed by Linus Torvalds
parent a3f5bafcc0
commit b05b9f5f9d
3 changed files with 27 additions and 0 deletions
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3
arch/x86/kernel/setup.c
View File

@ -1105,6 +1105,9 @@ 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.

21
arch/x86/platform/efi/efi.c
View File

@ -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

3
include/linux/efi.h
View File

@ -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
@ -868,6 +870,7 @@ extern void efi_enter_virtual_mode (void); /* switch EFI to virtual mode, if pos
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) {}