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drm/radeon: update ib_execute for SI (v2) 

When submitting a CONST_IB, emit a SWITCH_BUFFER
packet before the CONST_IB.  This isn't strictly necessary
(the driver will work fine without it), but is good practice
and allows for more flexible DE/CE sychronization options
in the future.  Current userspace drivers do not take
advantage of the CE yet.

v2: - clean up code flow a bit
    - no need to flush caches for CONST IB

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Alex Deucher 2012-07-17 14:02:29 -04:00 committed by Christian König
parent 4ef72566f1
commit a85a7da4c5
2 changed files with 29 additions and 21 deletions
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13
drivers/gpu/drm/radeon/si.c
View File

@ -1765,6 +1765,13 @@ void si_ring_ib_execute(struct radeon_device *rdev, struct radeon_ib *ib)
struct radeon_ring *ring = &rdev->ring[ib->ring];
u32 header;
if (ib->is_const_ib) {
/* set switch buffer packet before const IB */
radeon_ring_write(ring, PACKET3(PACKET3_SWITCH_BUFFER, 0));
radeon_ring_write(ring, 0);
header = PACKET3(PACKET3_INDIRECT_BUFFER_CONST, 2);
} else {
if (ring->rptr_save_reg) {
uint32_t next_rptr = ring->wptr + 3 + 4 + 8;
radeon_ring_write(ring, PACKET3(PACKET3_SET_CONFIG_REG, 1));
@ -1773,10 +1780,8 @@ void si_ring_ib_execute(struct radeon_device *rdev, struct radeon_ib *ib)
radeon_ring_write(ring, next_rptr);
}
if (ib->is_const_ib)
header = PACKET3(PACKET3_INDIRECT_BUFFER_CONST, 2);
else
header = PACKET3(PACKET3_INDIRECT_BUFFER, 2);
}
radeon_ring_write(ring, header);
radeon_ring_write(ring,
@ -1787,6 +1792,7 @@ void si_ring_ib_execute(struct radeon_device *rdev, struct radeon_ib *ib)
radeon_ring_write(ring, upper_32_bits(ib->gpu_addr) & 0xFFFF);
radeon_ring_write(ring, ib->length_dw | (ib->vm_id << 24));
if (!ib->is_const_ib) {
/* flush read cache over gart for this vmid */
radeon_ring_write(ring, PACKET3(PACKET3_SET_CONFIG_REG, 1));
radeon_ring_write(ring, (CP_COHER_CNTL2 - PACKET3_SET_CONFIG_REG_START) >> 2);
@ -1800,6 +1806,7 @@ void si_ring_ib_execute(struct radeon_device *rdev, struct radeon_ib *ib)
radeon_ring_write(ring, 0);
radeon_ring_write(ring, 10); /* poll interval */
}
}
/*
* CP.

1
drivers/gpu/drm/radeon/sid.h
View File

@ -901,5 +901,6 @@
#define PACKET3_WAIT_ON_DE_COUNTER_DIFF 0x88
#define PACKET3_SET_CE_DE_COUNTERS 0x89
#define PACKET3_WAIT_ON_AVAIL_BUFFER 0x8A
#define PACKET3_SWITCH_BUFFER 0x8B
#endif