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drm/radeon/kms: set gart pages to invalid on unbind and point to dummy page

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this uses a new entrypoint to invalidate gart entries instead of using 0.
Changed to rather than pointing to 0 address point empty entry to dummy
page. This might help to avoid hard lockup if for some wrong
reasons GPU try to access unmapped GART entry.

I'm not 100% sure this is going to work, we probably need to allocate
a dummy page and point all the GTT entries at it similiar to what AGP does.
but we can test this first I suppose.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2010-02-05 16:00:07 +10:00
parent e34398952e
commit 8256856568
10 changed files with 40 additions and 3 deletions
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2
drivers/gpu/drm/radeon/radeon_device.c
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@ -238,6 +238,8 @@ bool radeon_boot_test_post_card(struct radeon_device *rdev)
int radeon_dummy_page_init(struct radeon_device *rdev)
{
if (rdev->dummy_page.page)
return 0;
rdev->dummy_page.page = alloc_page(GFP_DMA32 | GFP_KERNEL | __GFP_ZERO);
if (rdev->dummy_page.page == NULL)
return -ENOMEM;