Messages in this thread Patch in this message | | | From | "Jonathan (Zhixiong) Zhang" <> | Subject | [PATCH V9 5/5] acpi, apei: use appropriate pgprot_t to map GHES memory | Date | Thu, 30 Jul 2015 14:35:09 -0700 |
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From: "Jonathan (Zhixiong) Zhang" <zjzhang@codeaurora.org>
With ACPI APEI firmware first handling, generic hardware error record is updated by firmware in GHES memory region. On an arm64 platform, firmware updates GHES memory region with uncached access attribute, and then Linux reads stale data from cache.
GHES memory region should be mapped with page protection type according to what is returned from arch_apei_get_mem_attribute(), instead of always with PAGE_KERNEL (eg. cached attribute).
Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org> --- drivers/acpi/apei/ghes.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index b979b5dbe5bc..98609b404dae 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -173,8 +173,10 @@ static void __iomem *ghes_ioremap_pfn_irq(u64 pfn) unsigned long vaddr; vaddr = (unsigned long)GHES_IOREMAP_IRQ_PAGE(ghes_ioremap_area->addr); - ioremap_page_range(vaddr, vaddr + PAGE_SIZE, - pfn << PAGE_SHIFT, PAGE_KERNEL); + ioremap_page_range(vaddr, + vaddr + PAGE_SIZE, + pfn << PAGE_SHIFT, + arch_apei_get_mem_attribute(pfn << PAGE_SHIFT)); return (void __iomem *)vaddr; } -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
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