Attachment 153953 Details for Bug 238709 – upstream patch

[patch] upstream patch

patch (text/plain), 1.29 KB, created by Chip Coldwell on 2007-05-02 14:31:52 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Chip Coldwell

Created: 2007-05-02 14:31:52 UTC

Size: 1.29 KB

patch

obsolete

>commit cf6387daf8858bdcb3e123034ca422e8979d73f1
>Author: Joachim Deguara <joachim.deguara@amd.com>
>Date:   Tue Apr 24 13:05:36 2007 +0200
>
>    [PATCH] x86-64: make GART PTEs uncacheable
>    
>    This patches fixes the silent data corruption problems being seen using the
>    GART iommu where 4kB of data where incorrect (seen mostly on Nvidia CK804
>    systems).  This fix, to mark the memory regin the GART PTEs reside on as
>    uncacheable, also brings the code in line with the AGP specification.
>    
>    Signed-off-by: Joachim Deguara <joachim.deguara@amd.com>
>    Signed-off-by: Andi Kleen <ak@suse.de>
>
>diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
>index 2bac8c6..0bae862 100644
>--- a/arch/x86_64/kernel/pci-gart.c
>+++ b/arch/x86_64/kernel/pci-gart.c
>@@ -519,7 +519,11 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
> 	gatt_size = (aper_size >> PAGE_SHIFT) * sizeof(u32); 
> 	gatt = (void *)__get_free_pages(GFP_KERNEL, get_order(gatt_size)); 
> 	if (!gatt) 
>-		panic("Cannot allocate GATT table"); 
>+		panic("Cannot allocate GATT table");
>+	if (change_page_attr_addr((unsigned long)gatt, gatt_size >> PAGE_SHIFT, PAGE_KERNEL_NOCACHE))
>+		panic("Could not set GART PTEs to uncacheable pages");
>+	global_flush_tlb();
>+
> 	memset(gatt, 0, gatt_size); 
> 	agp_gatt_table = gatt;
>

Actions: View | Diff

Attachments on bug 238709: 153953 | 153955