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drm/radeon: Sync ME and PFP after CP semaphore waits v4

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Fixes lockups due to CP read GPUVM faults when running piglit on Cape
Verde.

v2 (chk): apply the fix to R600+ as well, on CIK only the GFX CP has
	  a PFP, add more comments to R600 code, enable flushing again
v3: (agd5f): only apply to 7xx+.  r6xx does not have the packet.
v4: (agd5f): split flush change into a separate patch, fix formatting

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Tested-by: Michel Dänzer <michel.daenzer@amd.com>
This commit is contained in:
Christian König 2014-08-18 16:30:12 +02:00 • committed by Alex Deucher
parent 73ef0e0d62
commit 86302eeade
3 changed files with 36 additions and 0 deletions
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18
drivers/gpu/drm/radeon/r600.c
View file

@ -2753,6 +2753,17 @@ void r600_fence_ring_emit(struct radeon_device *rdev,
}
}
/**
* r600_semaphore_ring_emit - emit a semaphore on the CP ring
*
* @rdev: radeon_device pointer
* @ring: radeon ring buffer object
* @semaphore: radeon semaphore object
* @emit_wait: Is this a sempahore wait?
*
* Emits a semaphore signal/wait packet to the CP ring and prevents the PFP
* from running ahead of semaphore waits.
*/
bool r600_semaphore_ring_emit(struct radeon_device *rdev,
struct radeon_ring *ring,
struct radeon_semaphore *semaphore,
@ -2768,6 +2779,13 @@ bool r600_semaphore_ring_emit(struct radeon_device *rdev,
radeon_ring_write(ring, lower_32_bits(addr));
radeon_ring_write(ring, (upper_32_bits(addr) & 0xff) | sel);
/* PFP_SYNC_ME packet only exists on 7xx+ */
if (emit_wait && (rdev->family >= CHIP_RV770)) {
/* Prevent the PFP from running ahead of the semaphore wait */
radeon_ring_write(ring, PACKET3(PACKET3_PFP_SYNC_ME, 0));
radeon_ring_write(ring, 0x0);
}
return true;
}