drm/amdgpu: cache the fence to wait for a VMID
Beneficial when a lot of processes are waiting for VMIDs.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
index 156e026..7d28057 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
@@ -205,6 +205,9 @@ static int amdgpu_vmid_grab_idle(struct amdgpu_vm *vm,
unsigned i;
int r;
+ if (ring->vmid_wait && !dma_fence_is_signaled(ring->vmid_wait))
+ return amdgpu_sync_fence(adev, sync, ring->vmid_wait, false);
+
fences = kmalloc_array(sizeof(void *), id_mgr->num_ids, GFP_KERNEL);
if (!fences)
return -ENOMEM;
@@ -239,9 +242,9 @@ static int amdgpu_vmid_grab_idle(struct amdgpu_vm *vm,
}
r = amdgpu_sync_fence(adev, sync, &array->base, false);
- dma_fence_put(&array->base);
+ dma_fence_put(ring->vmid_wait);
+ ring->vmid_wait = &array->base;
return r;
-
}
kfree(fences);