From: "Jonathan (Zhixiong) Zhang" zjzhang@codeaurora.org
... 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@codeaurora.org --- 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