Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946807AbbHHRTf (ORCPT ); Sat, 8 Aug 2015 13:19:35 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:59456 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1946775AbbHHRTK (ORCPT ); Sat, 8 Aug 2015 13:19:10 -0400 From: "Jonathan (Zhixiong) Zhang" To: Matt Fleming , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, ying.huang@intel.com, tony.luck@gmail.com, fu.wei@linaro.org, al.stone@linaro.org, bp@alien8.de, rjw@rjwysocki.net, catalin.marinas@arm.com, will.deacon@arm.com, hanjun.guo@linaro.org Cc: "Jonathan (Zhixiong) Zhang" , linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, linaro-acpi@lists.linaro.org, timur@codeaurora.org Subject: [PATCH V11 2/5] x86: acpi: implement arch_apei_get_mem_attributes() Date: Sat, 8 Aug 2015 10:18:50 -0700 Message-Id: <1439054333-21766-3-git-send-email-zjzhang@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1439054333-21766-1-git-send-email-zjzhang@codeaurora.org> References: <1439054333-21766-1-git-send-email-zjzhang@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2372 Lines: 70 From: "Jonathan (Zhixiong) Zhang" ... to allow arch specific implementation of getting page protection type associated with a physical address. On x86, we currently have no way to lookup the EFI memory map attributes for a region in a consistent way because the memmap is discarded after efi_free_boot_services(). So if you call efi_mem_attributes() during boot and at runtime, you could theoretically see different attributes. Since we are yet to see any x86 platforms that require anything other than PAGE_KERNEL (some arm64 platforms require the equivalent of PAGE_KERNEL_NOCACHE), return that until we know differently. Signed-off-by: Jonathan (Zhixiong) Zhang --- arch/x86/include/asm/acpi.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h index 3a45668f6dc3..ffe22c6b17bd 100644 --- a/arch/x86/include/asm/acpi.h +++ b/arch/x86/include/asm/acpi.h @@ -32,6 +32,10 @@ #include #include +#ifdef CONFIG_ACPI_APEI +#include +#endif + #ifdef CONFIG_ACPI extern int acpi_lapic; extern int acpi_ioapic; @@ -147,4 +151,24 @@ extern int x86_acpi_numa_init(void); #define acpi_unlazy_tlb(x) leave_mm(x) +#ifdef CONFIG_ACPI_APEI +static inline pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr) +{ + /* + * We currently have no way to lookup the EFI memory map + * attributes for a region in a consistent way because the + * memmap is discarded after efi_free_boot_services(). So if + * you call efi_mem_attributes() during boot and at runtime, + * you could theoretically see different attributes. + * + * Since we are yet to see any x86 platforms that require + * anything other than PAGE_KERNEL (some arm64 platforms + * require the equivalent of PAGE_KERNEL_NOCACHE), return that + * until we know differently. + */ + + return PAGE_KERNEL; +} +#endif + #endif /* _ASM_X86_ACPI_H */ -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/