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drm/radeon: stop poisoning the GART TLB

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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>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2014-06-04 15:29:56 +02:00 committed by Alex Deucher
parent ea29286146
commit 0986c1a55c
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/radeon/rs600.c
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@ -634,7 +634,10 @@ int rs600_gart_set_page(struct radeon_device *rdev, int i, uint64_t addr)
return -EINVAL;
}
addr = addr & 0xFFFFFFFFFFFFF000ULL;
addr |= R600_PTE_GART;
if (addr == rdev->dummy_page.addr)
addr |= R600_PTE_SYSTEM | R600_PTE_SNOOPED;
else
addr |= R600_PTE_GART;
writeq(addr, ptr + (i * 8));
return 0;
}