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drm/radeon: stop poisoning the GART TLB 

commit 0986c1a55c upstream.

When we set the valid bit on invalid GART entries they are
loaded into the TLB when an adjacent entry is loaded. This
poisons the TLB with invalid entries which are sometimes
not correctly removed on TLB flush.

For stable inclusion the patch probably needs to be modified a bit.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian König 2014-06-04 15:29:56 +02:00 committed by Greg Kroah-Hartman
parent ed22557e4f
commit df0b5e31c9
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/radeon/rs600.c
View File

@ -646,8 +646,10 @@ int rs600_gart_set_page(struct radeon_device *rdev, int i, uint64_t addr)
return -EINVAL;
}
addr = addr & 0xFFFFFFFFFFFFF000ULL;
addr |= R600_PTE_VALID | R600_PTE_SYSTEM | R600_PTE_SNOOPED;
addr |= R600_PTE_READABLE | R600_PTE_WRITEABLE;
if (addr != rdev->dummy_page.addr)
addr |= R600_PTE_VALID | R600_PTE_READABLE |
R600_PTE_WRITEABLE;
addr |= R600_PTE_SYSTEM | R600_PTE_SNOOPED;
writeq(addr, ptr + (i * 8));
return 0;
}