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    Subject[PATCH V7 2/5] x86: acpi: implement arch_apei_get_mem_attributes()
    Date
    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
    --
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
    a Linux Foundation Collaborative Project


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