From: Andi Kleen <ak@suse.de>
To: tglx@linutronix.de, mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: [PATCH] [9/12] GBPAGES: Switch pci-gart over to using cpa instead of clear_kernel_mapping
Date: Fri, 1 Feb 2008 10:53:22 +0100 (CET) [thread overview]
Message-ID: <20080201095322.551CF1B416F@basil.firstfloor.org> (raw)
In-Reply-To: <200802011053.107168490@suse.de>
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)
next prev parent reply other threads:[~2008-02-01 9:55 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-01 9:53 [PATCH] [0/12] GBPAGES patchkit for 2.6.25 v3 Andi Kleen
2008-02-01 9:53 ` [PATCH] [1/12] GBPAGES: Add feature macros for the gbpages cpuid bit Andi Kleen
2008-02-01 9:53 ` [PATCH] [2/12] GBPAGES: Rename LARGE_PAGE_SIZE to PMD_PAGE_SIZE Andi Kleen
2008-02-01 9:53 ` [PATCH] [3/12] GBPAGES: Add PUD_PAGE_SIZE Andi Kleen
2008-02-01 9:53 ` [PATCH] [4/12] Add pgtable accessor functions for GB pages Andi Kleen
2008-02-01 9:53 ` [PATCH] [5/12] GBPAGES: Support gbpages in pagetable dump Andi Kleen
2008-02-01 9:53 ` [PATCH] [6/12] GBPAGES: Add gbpages support to lookup_address Andi Kleen
2008-02-01 9:53 ` [PATCH] [7/12] GBPAGES: Add an option to disable direct mapping gbpages and a global variable Andi Kleen
2008-02-05 22:41 ` Randy Dunlap
2008-02-01 9:53 ` [PATCH] [8/12] GBPAGES: Implement gbpages support in change_page_attr() Andi Kleen
2008-02-01 9:53 ` Andi Kleen [this message]
2008-02-01 9:53 ` [PATCH] [10/12] GBPAGES: Remove now unused clear_kernel_mapping Andi Kleen
2008-02-01 9:53 ` [PATCH] [11/12] GBPAGES: Do kernel direct mapping at boot using GB pages Andi Kleen
2008-02-01 9:53 ` [PATCH] [12/12] GBPAGES: Switch direct mapping setup over to set_pte Andi Kleen
2008-02-01 17:37 ` Jeremy Fitzhardinge
2008-02-01 17:58 ` Andi Kleen
2008-02-01 19:16 ` Jeremy Fitzhardinge
2008-02-01 12:25 ` [PATCH] [0/12] GBPAGES patchkit for 2.6.25 v3 Thomas Gleixner
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