drm/amdgpu: support cond exec

This adds the groundwork for conditional execution on
SDMA which is necessary for preemption.

Signed-off-by: Monk Liu <monk.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 972eed2ef787..dd79243d0a37 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -267,6 +267,15 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
         }
         ring->next_rptr_gpu_addr = adev->wb.gpu_addr + (ring->next_rptr_offs * 4);
         ring->next_rptr_cpu_addr = &adev->wb.wb[ring->next_rptr_offs];
+
+        r = amdgpu_wb_get(adev, &ring->cond_exe_offs);
+        if (r) {
+                dev_err(adev->dev, "(%d) ring cond_exec_polling wb alloc failed\n", r);
+                return r;
+        }
+        ring->cond_exe_gpu_addr = adev->wb.gpu_addr + (ring->cond_exe_offs * 4);
+        ring->cond_exe_cpu_addr = &adev->wb.wb[ring->cond_exe_offs];
+
         spin_lock_init(&ring->fence_lock);
         r = amdgpu_fence_driver_start_ring(ring, irq_src, irq_type);
         if (r) {