[PATCH 3/6] drm/amdgpu: reserve vmid by vm ioctl

[Chunming Zhou]

Change-Id: I5f80dc39dc9d44660a96a2b710b0dbb4d3b9039d
Signed-off-by: Chunming Zhou <David1.Zhou at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 56 ++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index acf9102..5f4dcc9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -397,6 +397,17 @@ static bool amdgpu_vm_had_gpu_reset(struct amdgpu_device *adev,
 		atomic_read(&adev->gpu_reset_counter);
 }
 
+static bool amdgpu_vm_dedicated_vmid_ready(struct amdgpu_vm *vm)
+{
+	unsigned vmhub;
+
+	for (vmhub = 0; vmhub < AMDGPU_MAX_VMHUBS; vmhub++) {
+		if (!vm->dedicated_vmid[vmhub])
+			return false;
+	}
+	return true;
+}
+
 /**
  * amdgpu_vm_grab_id - allocate the next free VMID
  *
@@ -546,6 +557,45 @@ int amdgpu_vm_grab_id(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
 	return r;
 }
 
+static int amdgpu_vm_alloc_dedicated_vmid(struct amdgpu_device *adev,
+					  struct amdgpu_vm *vm)
+{
+	struct amdgpu_vm_id_manager *id_mgr;
+	struct amdgpu_vm_id *idle;
+	unsigned vmhub;
+	int r;
+
+	for (vmhub = 0; vmhub < AMDGPU_MAX_VMHUBS; vmhub++) {
+		id_mgr = &adev->vm_manager.id_mgr[vmhub];
+
+		mutex_lock(&id_mgr->lock);
+		/* Select the first entry VMID */
+		idle = list_first_entry(&id_mgr->ids_lru, struct amdgpu_vm_id,
+					list);
+		list_del_init(&idle->list);
+		vm->dedicated_vmid[vmhub] = idle;
+		mutex_unlock(&id_mgr->lock);
+
+		r = amdgpu_sync_wait(&idle->active);
+		if (r)
+			goto err;
+	}
+
+	return 0;
+err:
+	for (vmhub = 0; vmhub < AMDGPU_MAX_VMHUBS; vmhub++) {
+		id_mgr = &adev->vm_manager.id_mgr[vmhub];
+
+		mutex_lock(&id_mgr->lock);
+		if (vm->dedicated_vmid[vmhub])
+			list_add(&vm->dedicated_vmid[vmhub]->list,
+				 &id_mgr->ids_lru);
+		vm->dedicated_vmid[vmhub] = NULL;
+		mutex_unlock(&id_mgr->lock);
+	}
+	return r;
+}
+
 static bool amdgpu_vm_ring_has_compute_vm_bug(struct amdgpu_ring *ring)
 {
 	struct amdgpu_device *adev = ring->adev;
@@ -2379,9 +2429,15 @@ int amdgpu_vm_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 	union drm_amdgpu_vm *args = data;
 	struct amdgpu_device *adev = dev->dev_private;
 	struct amdgpu_fpriv *fpriv = filp->driver_priv;
+	int r;
 
 	switch (args->in.op) {
 	case AMDGPU_VM_OP_RESERVE_VMID:
+		if (!amdgpu_vm_dedicated_vmid_ready(&fpriv->vm)) {
+			r = amdgpu_vm_alloc_dedicated_vmid(adev, &fpriv->vm);
+			if (r)
+				return r;
+		}
 		break;
 	default:
 		return -EINVAL;
-- 
1.9.1