From: "Jonathan (Zhixiong) Zhang" <zjzhang@xxxxxxxxxxxxxx>
... to allow arch specific implementation of getting page
protection type associated with a physical address.
If the physical address has memory attributes defined by EFI
memmap as EFI_MEMORY_UC, the page protection type is
PAGE_KENERL_NOCACHE. Otherwise, the page protection type is
PAGE_KERNEL.
Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@xxxxxxxxxxxxxx>
---
arch/x86/kernel/acpi/apei.c | 10 ++++++++++
include/acpi/apei.h | 1 +
2 files changed, 11 insertions(+)
diff --git a/arch/x86/kernel/acpi/apei.c b/arch/x86/kernel/acpi/apei.c
index c280df6b2aa2..9c6b3c8d81e4 100644
--- a/arch/x86/kernel/acpi/apei.c
+++ b/arch/x86/kernel/acpi/apei.c
@@ -14,6 +14,8 @@
#include <acpi/apei.h>
+#include <linux/efi.h>
+
#include <asm/mce.h>
#include <asm/tlbflush.h>
@@ -60,3 +62,11 @@ void arch_apei_flush_tlb_one(unsigned long addr)
{
__flush_tlb_one(addr);
}
+
+pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
+{
+ if (efi_mem_attributes(addr) & EFI_MEMORY_UC)
+ return PAGE_KERNEL_NOCACHE;
+
+ return PAGE_KERNEL;
+}
diff --git a/include/acpi/apei.h b/include/acpi/apei.h
index 284801ac7042..64a12ce9880b 100644
--- a/include/acpi/apei.h
+++ b/include/acpi/apei.h
@@ -46,6 +46,7 @@ int erst_clear(u64 record_id);
int arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, void *data);
void arch_apei_report_mem_error(int sev, struct cper_sec_mem_err *mem_err);
void arch_apei_flush_tlb_one(unsigned long addr);
+pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr);
#endif
#endif
--
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