[PATCH V7 2/5] x86: acpi: implement arch_apei_get_mem_attributes()
From: Jonathan (Zhixiong) Zhang <hidden>
Date: 2015-07-21 21:59:50
Also in:
linux-acpi, linux-efi
Subsystem:
acpi, acpi component architecture (acpica), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
"Rafael J. Wysocki", Saket Dumbre, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: "Jonathan (Zhixiong) Zhang" <redacted> ... 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 <redacted> --- 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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