drm/amdkfd: Return proper error code for gws alloc API

Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c

@@ -2124,7 +2124,7 @@ int amdgpu_amdkfd_add_gws_to_process(void *info, void *gws, struct kgd_mem **mem
 
 	*mem = kzalloc(sizeof(struct kgd_mem), GFP_KERNEL);
 	if (!*mem)
-		return -EINVAL;
+		return -ENOMEM;
 
 	mutex_init(&(*mem)->lock);
 	(*mem)->bo = amdgpu_bo_ref(gws_bo);

drivers/gpu/drm/amd/amdkfd/kfd_chardev.c

@@ -1575,15 +1575,15 @@ static int kfd_ioctl_alloc_queue_gws(struct file *filep,
 	struct kfd_dev *dev;
 
 	if (!hws_gws_support)
-		return -EINVAL;
+		return -ENODEV;
 
 	dev = kfd_device_by_id(args->gpu_id);
 	if (!dev) {
 		pr_debug("Could not find gpu id 0x%x\n", args->gpu_id);
-		return -EINVAL;
+		return -ENODEV;
 	}
 	if (dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS)
-		return -EINVAL;
+		return -ENODEV;
 
 	mutex_lock(&p->mutex);
 	retval = pqm_set_gws(&p->pqm, args->queue_id, args->num_gws ? dev->gws : NULL);

drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c

@@ -103,7 +103,7 @@ int pqm_set_gws(struct process_queue_manager *pqm, unsigned int qid,
 
 	/* Only allow one queue per process can have GWS assigned */
 	if (gws && pdd->qpd.num_gws)
-		return -EINVAL;
+		return -EBUSY;
 
 	if (!gws && pdd->qpd.num_gws == 0)
 		return -EINVAL;