drm/radeon: stop poisoning the GART TLB
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>
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@ -634,6 +634,9 @@ int rs600_gart_set_page(struct radeon_device *rdev, int i, uint64_t addr)
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return -EINVAL;
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}
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addr = addr & 0xFFFFFFFFFFFFF000ULL;
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if (addr == rdev->dummy_page.addr)
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addr |= R600_PTE_SYSTEM | R600_PTE_SNOOPED;
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else
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addr |= R600_PTE_GART;
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writeq(addr, ptr + (i * 8));
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return 0;
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