linux-kernel - [PATCH V6 2/4] x86: acpi: implement arch_apei_get_mem

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Date:	Mon, 20 Jul 2015 17:32:37 -0700
From:	"Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>
To:	Matt Fleming <matt.fleming@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	ying.huang@...el.com, fu.wei@...aro.org, al.stone@...aro.org,
	bp@...en8.de, rjw@...ysocki.net, lenb@...nel.org,
	catalin.marinas@....com, will.deacon@....com
Cc:	"Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>,
	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, linaro-acpi@...ts.linaro.org
Subject: [PATCH V6 2/4] x86: acpi: implement arch_apei_get_mem_attributes()

From: "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.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@...eaurora.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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