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Commit 86302eea authored by Christian König's avatar Christian König Committed by Alex Deucher
Browse files

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



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: default avatarMichel Dänzer <michel.daenzer@amd.com>
Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Tested-by: default avatarMichel Dänzer <michel.daenzer@amd.com>
parent 73ef0e0d

drivers/gpu/drm/radeon/cik.c

+17 −0
Original line number Diff line number Diff line
@@ -3920,6 +3920,17 @@ void cik_fence_compute_ring_emit(struct radeon_device *rdev, 
	radeon_ring_write(ring, 0);

}



/**

 * cik_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 cik_semaphore_ring_emit(struct radeon_device *rdev,

			     struct radeon_ring *ring,

			     struct radeon_semaphore *semaphore,
@@ -3932,6 +3943,12 @@ bool cik_semaphore_ring_emit(struct radeon_device *rdev, 
	radeon_ring_write(ring, lower_32_bits(addr));

	radeon_ring_write(ring, (upper_32_bits(addr) & 0xffff) | sel);



	if (emit_wait && ring->idx == RADEON_RING_TYPE_GFX_INDEX) {

		/* 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;

}

drivers/gpu/drm/radeon/r600.c

+18 −0
Original line number Diff line number Diff line
@@ -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;

}

drivers/gpu/drm/radeon/r600d.h

+1 −0
Original line number Diff line number Diff line
@@ -1597,6 +1597,7 @@ 
		 */

#              define PACKET3_CP_DMA_CMD_SAIC      (1 << 28)

#              define PACKET3_CP_DMA_CMD_DAIC      (1 << 29)

#define	PACKET3_PFP_SYNC_ME				0x42 /* r7xx+ only */

#define	PACKET3_SURFACE_SYNC				0x43

#              define PACKET3_CB0_DEST_BASE_ENA    (1 << 6)

#              define PACKET3_FULL_CACHE_ENA       (1 << 20) /* r7xx+ only */