efi: Make efi_find_mirror() public

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4PM01
CVE: NA

--------------------------------

Commit b05b9f5f ("x86, mirror: x86 enabling - find mirrored memory
ranges") introduce the efi_find_mirror function on x86. In order to reuse
the API we make it public in preparation for arm64 to support mirrord
memory.
Co-developed-by: NJing Xiangfeng <jingxiangfeng@huawei.com>
Signed-off-by: NMa Wupeng <mawupeng1@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/x86/platform/efi/efi.c

@@ -105,29 +105,6 @@ static int __init setup_add_efi_memmap(char *arg)
 }
 early_param("add_efi_memmap", setup_add_efi_memmap);
 
-void __init efi_find_mirror(void)
-{
-	efi_memory_desc_t *md;
-	u64 mirror_size = 0, total_size = 0;
-
-	if (!efi_enabled(EFI_MEMMAP))
-		return;
-
-	for_each_efi_memory_desc(md) {
-		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 passed in e820

drivers/firmware/efi/efi.c

@@ -435,6 +435,29 @@ static int __init efisubsys_init(void)
 
 subsys_initcall(efisubsys_init);
 
+void __init efi_find_mirror(void)
+{
+	efi_memory_desc_t *md;
+	u64 mirror_size = 0, total_size = 0;
+
+	if (!efi_enabled(EFI_MEMMAP))
+		return;
+
+	for_each_efi_memory_desc(md) {
+		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);
+}
+
 /*
  * Find the efi memory descriptor for a given physical address.  Given a
  * physical address, determine if it exists within an EFI Memory Map entry,

include/linux/efi.h

@@ -812,6 +812,7 @@ static inline bool efi_rt_services_supported(unsigned int mask)
 {
 	return (efi.runtime_supported_mask & mask) == mask;
 }
+extern void efi_find_mirror(void);
 #else
 static inline bool efi_enabled(int feature)
 {
@@ -835,6 +836,8 @@ static inline bool efi_rt_services_supported(unsigned int mask)
 {
 	return false;
 }
+
+static inline void efi_find_mirror(void) {}
 #endif
 
 extern int efi_status_to_err(efi_status_t status);