[PATCH 5/6] drm/amdgpu: implement grab dedicated vmid V2

[Chunming Zhou]

v2: move sync waiting only when flush needs

Change-Id: I64da2701c9fdcf986afb90ba1492a78d5bef1b6c
Signed-off-by: Chunming Zhou <David1.Zhou at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 61 ++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index f7113b9..2c0b453 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -408,6 +408,63 @@ static bool amdgpu_vm_dedicated_vmid_ready(struct amdgpu_vm *vm)
 	return true;
 }
 
+static int amdgpu_vm_grab_dedicated_vmid(struct amdgpu_vm *vm,
+					 struct amdgpu_ring *ring,
+					 struct amdgpu_sync *sync,
+					 struct fence *fence,
+					 struct amdgpu_job *job)
+{
+	struct amdgpu_device *adev = ring->adev;
+	unsigned vmhub = ring->funcs->vmhub;
+	struct amdgpu_vm_id *id = vm->dedicated_vmid[vmhub];
+	struct amdgpu_vm_id_manager *id_mgr = &adev->vm_manager.id_mgr[vmhub];
+	struct fence *updates = sync->last_vm_update;
+	int r = 0;
+	struct fence *flushed, *tmp;
+	bool needs_flush = false;
+
+	mutex_lock(&id_mgr->lock);
+	if (amdgpu_vm_had_gpu_reset(adev, id))
+		needs_flush = true;
+
+	flushed  = id->flushed_updates;
+	if (updates && (!flushed || updates->context != flushed->context ||
+			fence_is_later(updates, flushed)))
+		needs_flush = true;
+	if (needs_flush) {
+		tmp = amdgpu_sync_get_fence(&id->active);
+		if (tmp) {
+			r = amdgpu_sync_fence(adev, sync, tmp);
+			fence_put(tmp);
+			mutex_unlock(&id_mgr->lock);
+			return r;
+		}
+	}
+
+	/* Good we can use this VMID. Remember this submission as
+	* user of the VMID.
+	*/
+	r = amdgpu_sync_fence(ring->adev, &id->active, fence);
+	if (r)
+		goto out;
+
+	if (updates && (!flushed || updates->context != flushed->context ||
+			fence_is_later(updates, flushed))) {
+		fence_put(id->flushed_updates);
+		id->flushed_updates = fence_get(updates);
+	}
+	id->pd_gpu_addr = job->vm_pd_addr;
+	id->current_gpu_reset_count = atomic_read(&adev->gpu_reset_counter);
+	atomic64_set(&id->owner, vm->client_id);
+	job->vm_needs_flush = needs_flush;
+
+	job->vm_id = id - id_mgr->ids;
+	trace_amdgpu_vm_grab_id(vm, ring, job);
+out:
+	mutex_unlock(&id_mgr->lock);
+	return r;
+}
+
 /**
  * amdgpu_vm_grab_id - allocate the next free VMID
  *
@@ -432,6 +489,10 @@ int amdgpu_vm_grab_id(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
 	unsigned i;
 	int r = 0;
 
+	if (amdgpu_vm_dedicated_vmid_ready(vm))
+		return amdgpu_vm_grab_dedicated_vmid(vm, ring, sync,
+						     fence, job);
+
 	fences = kmalloc_array(sizeof(void *), id_mgr->num_ids, GFP_KERNEL);
 	if (!fences)
 		return -ENOMEM;
-- 
1.9.1