Re: [Xen-devel] Re: pvops: i915 kms crashs with corrupt page table

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 02/25/2010 02:32 AM, Bastian Blank wrote:
> On Thu, Feb 25, 2010 at 11:06:20AM +0100, Bastian Blank wrote:
>    
> > On Wed, Feb 24, 2010 at 11:23:37AM -0800, Jeremy Fitzhardinge wrote:
> >      
> > > On 02/24/2010 09:55 AM, Bastian Blank wrote:
> > >        
> > > > I run a 2.6.32 dom0 kernel (the Debian distribution config). If I enable
> > > > KMS in the intel driver, Xorg crashs with corrupt page table.
> > > >          
> > > Does this help?
> > >        
> > No.
> >      
> But it is something like that:
>
> intel_i810_configure:
>          pci_read_config_dword(intel_private.pcidev, I810_GMADDR,&temp);
>          agp_bridge->gart_bus_addr = (temp&  PCI_BASE_ADDRESS_MEM_MASK);
>
> agp_copy_info:
>         info->aper_base = bridge->gart_bus_addr;
>
> drm_agp_init:
>         head->base = head->agp_info.aper_base;
>
>         dev->agp = head
>
> i915_gem_init_ringbuffer:
>         ring->map.offset = dev->agp->base + obj_priv->gtt_offset;
>
> This address is directly used to create a userspace mapping.
>    
Does this help?

diff --git a/arch/x86/include/asm/pgtable_64.h 
b/arch/x86/include/asm/pgtable_64.h
index c57a301..4e46931 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -160,7 +160,7 @@ extern void cleanup_highmap(void);
 #define pgtable_cache_init()   do { } while (0)
 #define check_pgt_cache()      do { } while (0)

-#define PAGE_AGP    PAGE_KERNEL_NOCACHE
+#define PAGE_AGP    PAGE_KERNEL_IO_NOCACHE
 #define HAVE_PAGE_AGP 1

 /* fs/proc/kcore.c */

        J


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