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drm/radeon: stop poisoning the GART TLB

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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 e9c2b01dc3
commit 5f4b3e2d0a
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/radeon/rs600.c
View File

@@ -582,8 +582,10 @@ 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;
}