KIQ doesn't really use the GPU scheduler. The base
drivers generally use the KIQ ring directly rather than
submitting IBs. However, amdgpu_sched_hw_submission
(which defaults to 2) limits the number of outstanding
fences to 2. KFD uses the KIQ for TLB flushes and the
2 fence limit hurts performance when there are several KFD
processes running.
v2: move some expressions to one line
change KIQ sched_hw_submission to at least 16
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 6c5646b..7c251ff 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -170,6 +170,16 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
unsigned irq_type)
{
int r;
+ int sched_hw_submission = amdgpu_sched_hw_submission;
+
+ /* Set the hw submission limit higher for KIQ because
+ * it's used for a number of gfx/compute tasks by both
+ * KFD and KGD which may have outstanding fences and
+ * it doesn't really use the gpu scheduler anyway;
+ * KIQ tasks get submitted directly to the ring.
+ */
+ if (ring->funcs->type == AMDGPU_RING_TYPE_KIQ)
+ sched_hw_submission = max(sched_hw_submission, 16);
if (ring->adev == NULL) {
if (adev->num_rings >= AMDGPU_MAX_RINGS)
@@ -178,8 +188,7 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
ring->adev = adev;
ring->idx = adev->num_rings++;
adev->rings[ring->idx] = ring;
- r = amdgpu_fence_driver_init_ring(ring,
- amdgpu_sched_hw_submission);
+ r = amdgpu_fence_driver_init_ring(ring, sched_hw_submission);
if (r)
return r;
}
@@ -218,8 +227,7 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
return r;
}
- ring->ring_size = roundup_pow_of_two(max_dw * 4 *
- amdgpu_sched_hw_submission);
+ ring->ring_size = roundup_pow_of_two(max_dw * 4 * sched_hw_submission);
ring->buf_mask = (ring->ring_size / 4) - 1;
ring->ptr_mask = ring->funcs->support_64bit_ptrs ?
--
2.5.5
