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[PATCH] [9/12] GBPAGES: Switch pci-gart over to using cpa instead of clear_kernel_mapping

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From: Andi Kleen
Subject: [PATCH] [9/12] GBPAGES: Switch pci-gart over to using cpa instead of clear_kernel_mapping
Date: Friday, February 1, 2008 - 2:53 am

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@suse.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)
--
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Messages in current thread:
[PATCH] [0/12] GBPAGES patchkit for 2.6.25 v3, Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [1/12] GBPAGES: Add feature macros for the gbpages ..., Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [2/12] GBPAGES: Rename LARGE_PAGE_SIZE to PMD_PAGE ..., Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [3/12] GBPAGES: Add PUD_PAGE_SIZE, Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [4/12] Add pgtable accessor functions for GB pages, Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [5/12] GBPAGES: Support gbpages in pagetable dump, Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [6/12] GBPAGES: Add gbpages support to lookup_address, Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [7/12] GBPAGES: Add an option to disable direct ma ..., Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [8/12] GBPAGES: Implement gbpages support in chang ..., Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [9/12] GBPAGES: Switch pci-gart over to using cpa ..., Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [10/12] GBPAGES: Remove now unused clear_kernel_ma ..., Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [11/12] GBPAGES: Do kernel direct mapping at boot ..., Andi Kleen, (Fri Feb 1, 2:53 am)
[PATCH] [12/12] GBPAGES: Switch direct mapping setup over ..., Andi Kleen, (Fri Feb 1, 2:53 am)
Re: [PATCH] [0/12] GBPAGES patchkit for 2.6.25 v3, Thomas Gleixner, (Fri Feb 1, 5:25 am)
Re: [PATCH] [12/12] GBPAGES: Switch direct mapping setup o ..., Jeremy Fitzhardinge, (Fri Feb 1, 10:37 am)
Re: [PATCH] [12/12] GBPAGES: Switch direct mapping setup o ..., Andi Kleen, (Fri Feb 1, 10:58 am)
Re: [PATCH] [12/12] GBPAGES: Switch direct mapping setup o ..., Jeremy Fitzhardinge, (Fri Feb 1, 12:16 pm)
Re: [PATCH] [7/12] GBPAGES: Add an option to disable direc ..., Randy Dunlap, (Tue Feb 5, 3:41 pm)