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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
View File

@ -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);

8
drivers/gpu/drm/radeon/si_dma.c
View File

@ -206,6 +206,14 @@ void si_dma_vm_flush(struct radeon_device *rdev, struct radeon_ring *ring,
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0, 0));
radeon_ring_write(ring, (0xf << 16) | (VM_INVALIDATE_REQUEST >> 2));
radeon_ring_write(ring, 1 << vm_id);
/* wait for invalidate to complete */
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_POLL_REG_MEM, 0, 0, 0, 0));
radeon_ring_write(ring, VM_INVALIDATE_REQUEST);
radeon_ring_write(ring, 0xff << 16); /* retry */
radeon_ring_write(ring, 1 << vm_id); /* mask */
radeon_ring_write(ring, 0); /* value */
radeon_ring_write(ring, (0 << 28) | 0x20); /* func(always) | poll interval */
}
/**

18
drivers/gpu/drm/radeon/sid.h
View File

@ -1632,6 +1632,23 @@
#define PACKET3_MPEG_INDEX 0x3A
#define PACKET3_COPY_DW 0x3B
#define PACKET3_WAIT_REG_MEM 0x3C
#define WAIT_REG_MEM_FUNCTION(x) ((x) << 0)
/* 0 - always
* 1 - <
* 2 - <=
* 3 - ==
* 4 - !=
* 5 - >=
* 6 - >
*/
#define WAIT_REG_MEM_MEM_SPACE(x) ((x) << 4)
/* 0 - reg
* 1 - mem
*/
#define WAIT_REG_MEM_ENGINE(x) ((x) << 8)
/* 0 - me
* 1 - pfp
*/
#define PACKET3_MEM_WRITE 0x3D
#define PACKET3_COPY_DATA 0x40
#define PACKET3_CP_DMA 0x41
@ -1835,6 +1852,7 @@
#define DMA_PACKET_TRAP 0x7
#define DMA_PACKET_SRBM_WRITE 0x9
#define DMA_PACKET_CONSTANT_FILL 0xd
#define DMA_PACKET_POLL_REG_MEM 0xe
#define DMA_PACKET_NOP 0xf
#define VCE_STATUS 0x20004