[PATCH 8/9] drm/ttm: use GEM references for VM mappings

[Matthew Brost]

On Tue, Jul 16, 2024 at 02:35:18PM +0200, Christian König wrote:
> Instead of a TTM reference grab a GEM reference whenever necessary for a
> VM mapping.
> 
> Signed-off-by: Christian König <christian.koenig at amd.com>

Reviewed-by: Matthew Brost <matthew.brost at intel.com>

> ---
>  drivers/gpu/drm/ttm/ttm_bo_vm.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> index 4212b8c91dd4..3f283b3433f8 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> @@ -58,13 +58,13 @@ static vm_fault_t ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
>  		if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT)
>  			return VM_FAULT_RETRY;
>  
> -		ttm_bo_get(bo);
> +		drm_gem_object_get(&bo->base);
>  		mmap_read_unlock(vmf->vma->vm_mm);
>  		(void)dma_resv_wait_timeout(bo->base.resv,
>  					    DMA_RESV_USAGE_KERNEL, true,
>  					    MAX_SCHEDULE_TIMEOUT);
>  		dma_resv_unlock(bo->base.resv);
> -		ttm_bo_put(bo);
> +		drm_gem_object_put(&bo->base);
>  		return VM_FAULT_RETRY;
>  	}
>  
> @@ -130,12 +130,12 @@ vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo,
>  		 */
>  		if (fault_flag_allow_retry_first(vmf->flags)) {
>  			if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
> -				ttm_bo_get(bo);
> +				drm_gem_object_get(&bo->base);
>  				mmap_read_unlock(vmf->vma->vm_mm);
>  				if (!dma_resv_lock_interruptible(bo->base.resv,
>  								 NULL))
>  					dma_resv_unlock(bo->base.resv);
> -				ttm_bo_put(bo);
> +				drm_gem_object_put(&bo->base);
>  			}
>  
>  			return VM_FAULT_RETRY;
> @@ -353,7 +353,7 @@ void ttm_bo_vm_open(struct vm_area_struct *vma)
>  
>  	WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping);
>  
> -	ttm_bo_get(bo);
> +	drm_gem_object_get(&bo->base);
>  }
>  EXPORT_SYMBOL(ttm_bo_vm_open);
>  
> @@ -361,7 +361,7 @@ void ttm_bo_vm_close(struct vm_area_struct *vma)
>  {
>  	struct ttm_buffer_object *bo = vma->vm_private_data;
>  
> -	ttm_bo_put(bo);
> +	drm_gem_object_put(&bo->base);
>  	vma->vm_private_data = NULL;
>  }
>  EXPORT_SYMBOL(ttm_bo_vm_close);
> @@ -462,7 +462,7 @@ int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
>  	if (is_cow_mapping(vma->vm_flags))
>  		return -EINVAL;
>  
> -	ttm_bo_get(bo);
> +	drm_gem_object_get(&bo->base);
>  
>  	/*
>  	 * Drivers may want to override the vm_ops field. Otherwise we
> -- 
> 2.34.1
>