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drm/radeon: fix VM flush on SI (v3)

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We need to wait for the GPUVM flush to complete.  There
was some confusion as to how this mechanism was supposed
to work.  The operation is not atomic.  For GPU initiated
invalidations you need to read back a VM register to
introduce enough latency for the update to complete.

v2: drop gart changes
v3: just read back rather than polling

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher
2015-01-05 19:54:50 -05:00
parent cbfc35b90f
commit d474ea7e52
3 changed files with 36 additions and 0 deletions
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10
drivers/gpu/drm/radeon/si.c
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@@ -5057,6 +5057,16 @@ void si_vm_flush(struct radeon_device *rdev, struct radeon_ring *ring,
radeon_ring_write(ring, 0);
radeon_ring_write(ring, 1 << vm_id);
/* wait for the invalidate to complete */
radeon_ring_write(ring, PACKET3(PACKET3_WAIT_REG_MEM, 5));
radeon_ring_write(ring, (WAIT_REG_MEM_FUNCTION(0) | /* always */
WAIT_REG_MEM_ENGINE(0))); /* me */
radeon_ring_write(ring, VM_INVALIDATE_REQUEST >> 2);
radeon_ring_write(ring, 0);
radeon_ring_write(ring, 0); /* ref */
radeon_ring_write(ring, 0); /* mask */
radeon_ring_write(ring, 0x20); /* poll interval */
/* sync PFP to ME, otherwise we might get invalid PFP reads */
radeon_ring_write(ring, PACKET3(PACKET3_PFP_SYNC_ME, 0));
radeon_ring_write(ring, 0x0);