From: "Jonathan (Zhixiong) Zhang" <zjzhang@xxxxxxxxxxxxxx>
Both x86 and ia64 implemented efi_mem_attributs function, which is architecture
agnositc. This function is moved to efi subsystem.
efi_remap() function is added. If EFI memmap feature is enabled, and if a
memory region has attribute of EFI_MEMORY_UC, map it as uncached.
---
This patch was tested on an arm64 platform. It was built on x86 platform.
Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@xxxxxxxxxxxxxx>
---
arch/ia64/kernel/efi.c | 11 -----------
arch/x86/platform/efi/efi.c | 18 ------------------
drivers/firmware/efi/efi.c | 27 +++++++++++++++++++++++++++
include/linux/efi.h | 1 +
4 files changed, 28 insertions(+), 29 deletions(-)
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index c52d7540dc05..ef20ec784b04 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -771,17 +771,6 @@ efi_mem_type (unsigned long phys_addr)
}
u64
-efi_mem_attributes (unsigned long phys_addr)
-{
- efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
-
- if (md)
- return md->attribute;
- return 0;
-}
-EXPORT_SYMBOL(efi_mem_attributes);
-
-u64
efi_mem_attribute (unsigned long phys_addr, unsigned long size)
{
unsigned long end = phys_addr + size;
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index dbc8627a5cdf..88b3ebaeb72f 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -917,24 +917,6 @@ u32 efi_mem_type(unsigned long phys_addr)
return 0;
}
-u64 efi_mem_attributes(unsigned long phys_addr)
-{
- efi_memory_desc_t *md;
- void *p;
-
- if (!efi_enabled(EFI_MEMMAP))
- return 0;
-
- for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
- md = p;
- if ((md->phys_addr <= phys_addr) &&
- (phys_addr < (md->phys_addr +
- (md->num_pages << EFI_PAGE_SHIFT))))
- return md->attribute;
- }
- return 0;
-}
-
static int __init arch_parse_efi_cmdline(char *str)
{
if (parse_option_str(str, "old_map"))
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 3061bb8629dc..5b42bb6d1fde 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -517,3 +517,30 @@ char * __init efi_md_typeattr_format(char *buf, size_t size,
attr & EFI_MEMORY_UC ? "UC" : "");
return buf;
}
+
+u64 efi_mem_attributes(unsigned long phys_addr)
+{
+ efi_memory_desc_t *md;
+ void *p;
+
+ if (!efi_enabled(EFI_MEMMAP))
+ return 0;
+
+ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
+ md = p;
+ if ((md->phys_addr <= phys_addr) &&
+ (phys_addr < (md->phys_addr +
+ (md->num_pages << EFI_PAGE_SHIFT))))
+ return md->attribute;
+ }
+ return 0;
+}
+
+void __iomem *efi_remap(phys_addr_t phys_addr, size_t size)
+{
+ if (efi_enabled(EFI_MEMMAP) &&
+ (efi_mem_attributes(phys_addr) & EFI_MEMORY_UC))
+ return ioremap(phys_addr, size);
+ else
+ return ioremap_cache(phys_addr, size);
+}
diff --git a/include/linux/efi.h b/include/linux/efi.h
index cf7e431cbc73..3279b5acea11 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -891,6 +891,7 @@ extern struct efi_memory_map memmap;
extern int efi_reboot_quirk_mode;
extern bool efi_poweroff_required(void);
+extern void __iomem *efi_remap(phys_addr_t phys_addr, size_t size);
/* Iterate through an efi_memory_map */
#define for_each_efi_memory_desc(m, md) \
--
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