Re: [PATCH v4 01/17] drm/ttm: turn ttm_bo_device.vma_manager into a pointer

[Daniel Vetter]

On Thu, Aug 08, 2019 at 03:44:01PM +0200, Gerd Hoffmann wrote:
> Rename the embedded struct vma_offset_manager, it is named _vma_manager
> now.  ttm_bo_device.vma_manager is a pointer now, pointing to the
> embedded ttm_bo_device._vma_manager by default.
> 
> Add ttm_bo_device_init_with_vma_manager() function which allows to
> initialize ttm with a different vma manager.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>

I think a todo to convert all other ttm drivers over and then move
_vma_manager into vmwgfx would be nice. If you're not volunteering
yourself for this ofc.
-Daniel

> ---
>  include/drm/ttm/ttm_bo_driver.h | 11 +++++++++--
>  drivers/gpu/drm/ttm/ttm_bo.c    | 29 +++++++++++++++++++++--------
>  drivers/gpu/drm/ttm/ttm_bo_vm.c |  6 +++---
>  3 files changed, 33 insertions(+), 13 deletions(-)
> 
> diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
> index 3f1935c19a66..2f84d6bcd1a7 100644
> --- a/include/drm/ttm/ttm_bo_driver.h
> +++ b/include/drm/ttm/ttm_bo_driver.h
> @@ -441,7 +441,8 @@ extern struct ttm_bo_global {
>   *
>   * @driver: Pointer to a struct ttm_bo_driver struct setup by the driver.
>   * @man: An array of mem_type_managers.
> - * @vma_manager: Address space manager
> + * @vma_manager: Address space manager (pointer)
> + * @_vma_manager: Address space manager (enbedded)
>   * lru_lock: Spinlock that protects the buffer+device lru lists and
>   * ddestroy lists.
>   * @dev_mapping: A pointer to the struct address_space representing the
> @@ -464,7 +465,8 @@ struct ttm_bo_device {
>  	/*
>  	 * Protected by internal locks.
>  	 */
> -	struct drm_vma_offset_manager vma_manager;
> +	struct drm_vma_offset_manager *vma_manager;
> +	struct drm_vma_offset_manager _vma_manager;
>  
>  	/*
>  	 * Protected by the global:lru lock.
> @@ -597,6 +599,11 @@ int ttm_bo_device_init(struct ttm_bo_device *bdev,
>  		       struct ttm_bo_driver *driver,
>  		       struct address_space *mapping,
>  		       bool need_dma32);
> +int ttm_bo_device_init_with_vma_manager(struct ttm_bo_device *bdev,
> +					struct ttm_bo_driver *driver,
> +					struct address_space *mapping,
> +					struct drm_vma_offset_manager *vma_manager,
> +					bool need_dma32);
>  
>  /**
>   * ttm_bo_unmap_virtual
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index 10a861a1690c..0ed1a1182962 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -672,7 +672,7 @@ static void ttm_bo_release(struct kref *kref)
>  	struct ttm_bo_device *bdev = bo->bdev;
>  	struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
>  
> -	drm_vma_offset_remove(&bdev->vma_manager, &bo->base.vma_node);
> +	drm_vma_offset_remove(bdev->vma_manager, &bo->base.vma_node);
>  	ttm_mem_io_lock(man, false);
>  	ttm_mem_io_free_vm(bo);
>  	ttm_mem_io_unlock(man);
> @@ -1353,7 +1353,7 @@ int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
>  	 */
>  	if (bo->type == ttm_bo_type_device ||
>  	    bo->type == ttm_bo_type_sg)
> -		ret = drm_vma_offset_add(&bdev->vma_manager, &bo->base.vma_node,
> +		ret = drm_vma_offset_add(bdev->vma_manager, &bo->base.vma_node,
>  					 bo->mem.num_pages);
>  
>  	/* passed reservation objects should already be locked,
> @@ -1704,7 +1704,7 @@ int ttm_bo_device_release(struct ttm_bo_device *bdev)
>  			pr_debug("Swap list %d was clean\n", i);
>  	spin_unlock(&glob->lru_lock);
>  
> -	drm_vma_offset_manager_destroy(&bdev->vma_manager);
> +	drm_vma_offset_manager_destroy(&bdev->_vma_manager);
>  
>  	if (!ret)
>  		ttm_bo_global_release();
> @@ -1713,10 +1713,11 @@ int ttm_bo_device_release(struct ttm_bo_device *bdev)
>  }
>  EXPORT_SYMBOL(ttm_bo_device_release);
>  
> -int ttm_bo_device_init(struct ttm_bo_device *bdev,
> -		       struct ttm_bo_driver *driver,
> -		       struct address_space *mapping,
> -		       bool need_dma32)
> +int ttm_bo_device_init_with_vma_manager(struct ttm_bo_device *bdev,
> +					struct ttm_bo_driver *driver,
> +					struct address_space *mapping,
> +					struct drm_vma_offset_manager *vma_manager,
> +					bool need_dma32)
>  {
>  	struct ttm_bo_global *glob = &ttm_bo_glob;
>  	int ret;
> @@ -1737,7 +1738,8 @@ int ttm_bo_device_init(struct ttm_bo_device *bdev,
>  	if (unlikely(ret != 0))
>  		goto out_no_sys;
>  
> -	drm_vma_offset_manager_init(&bdev->vma_manager,
> +	bdev->vma_manager = vma_manager;
> +	drm_vma_offset_manager_init(&bdev->_vma_manager,
>  				    DRM_FILE_PAGE_OFFSET_START,
>  				    DRM_FILE_PAGE_OFFSET_SIZE);
>  	INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
> @@ -1754,6 +1756,17 @@ int ttm_bo_device_init(struct ttm_bo_device *bdev,
>  	ttm_bo_global_release();
>  	return ret;
>  }
> +EXPORT_SYMBOL(ttm_bo_device_init_with_vma_manager);
> +
> +int ttm_bo_device_init(struct ttm_bo_device *bdev,
> +		       struct ttm_bo_driver *driver,
> +		       struct address_space *mapping,
> +		       bool need_dma32)
> +{
> +	return ttm_bo_device_init_with_vma_manager(bdev, driver, mapping,
> +						   &bdev->_vma_manager,
> +						   need_dma32);
> +}
>  EXPORT_SYMBOL(ttm_bo_device_init);
>  
>  /*
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> index 85f5bcbe0c76..d4eecde8d050 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> @@ -409,16 +409,16 @@ static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev,
>  	struct drm_vma_offset_node *node;
>  	struct ttm_buffer_object *bo = NULL;
>  
> -	drm_vma_offset_lock_lookup(&bdev->vma_manager);
> +	drm_vma_offset_lock_lookup(bdev->vma_manager);
>  
> -	node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages);
> +	node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
>  	if (likely(node)) {
>  		bo = container_of(node, struct ttm_buffer_object,
>  				  base.vma_node);
>  		bo = ttm_bo_get_unless_zero(bo);
>  	}
>  
> -	drm_vma_offset_unlock_lookup(&bdev->vma_manager);
> +	drm_vma_offset_unlock_lookup(bdev->vma_manager);
>  
>  	if (!bo)
>  		pr_err("Could not find buffer object to map\n");
> -- 
> 2.18.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch