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Message-Id: <20080201095322.551CF1B416F@basil.firstfloor.org> Date: Fri, 1 Feb 2008 10:53:22 +0100 (CET) From: Andi Kleen <ak@...e.de> To: tglx@...utronix.de, mingo@...e.hu, linux-kernel@...r.kernel.org Subject: [PATCH] [9/12] GBPAGES: Switch pci-gart over to using cpa instead of clear_kernel_mapping pci-gart needs to unmap the IOMMU aperture to prevent cache corruptions. Switch this over to using cpa instead of clear_kernel_mapping() Drawback right now is that cpa will split everything down to 4k pages, and this costs 4K for each 2MB of aperture; 128KB for a typical 64MB aperture. Signed-off-by: Andi Kleen <ak@...e.de> --- arch/x86/kernel/pci-gart_64.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux/arch/x86/kernel/pci-gart_64.c =================================================================== --- linux.orig/arch/x86/kernel/pci-gart_64.c +++ linux/arch/x86/kernel/pci-gart_64.c @@ -731,7 +731,8 @@ void __init gart_iommu_init(void) * the backing memory. The GART address is only used by PCI * devices. */ - clear_kernel_mapping((unsigned long)__va(iommu_bus_base), iommu_size); + set_memory_np((unsigned long)__va(iommu_bus_base), + iommu_size >> PAGE_SHIFT); /* * Try to workaround a bug (thanks to BenH) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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