[PATCH 49/59] drm/vmwgfx/gmrid: convert to driver controlled allocation.

[daniel at ffwll.ch]

On Tue, Aug 04, 2020 at 12:56:22PM +1000, Dave Airlie wrote:
> From: Dave Airlie <airlied at redhat.com>
> 
> Signed-off-by: Dave Airlie <airlied at redhat.com>
> ---
>  drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c | 32 +++++++++++--------
>  1 file changed, 18 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c b/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
> index 54c85a59dd8b..bc51b7773084 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
> @@ -37,6 +37,7 @@
>  #include <linux/kernel.h>
>  
>  struct vmwgfx_gmrid_man {
> +	struct ttm_mem_type_manager manager;
>  	spinlock_t lock;
>  	struct ida gmr_ida;
>  	uint32_t max_gmr_ids;
> @@ -44,13 +45,17 @@ struct vmwgfx_gmrid_man {
>  	uint32_t used_gmr_pages;
>  };
>  
> +static struct vmwgfx_gmrid_man *to_gmrid_manager(struct ttm_mem_type_manager *man)
> +{
> +	return container_of(man, struct vmwgfx_gmrid_man, manager);
> +}
> +
>  static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
>  				  struct ttm_buffer_object *bo,
>  				  const struct ttm_place *place,
>  				  struct ttm_mem_reg *mem)
>  {
> -	struct vmwgfx_gmrid_man *gman =
> -		(struct vmwgfx_gmrid_man *)man->priv;
> +	struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
>  	int id;
>  
>  	id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
> @@ -82,8 +87,7 @@ static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
>  static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
>  				   struct ttm_mem_reg *mem)
>  {
> -	struct vmwgfx_gmrid_man *gman =
> -		(struct vmwgfx_gmrid_man *)man->priv;
> +	struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
>  
>  	if (mem->mm_node) {
>  		ida_free(&gman->gmr_ida, mem->start);
> @@ -98,13 +102,15 @@ static const struct ttm_mem_type_manager_func vmw_gmrid_manager_func;
>  
>  int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
>  {
> -	struct ttm_mem_type_manager *man = ttm_manager_type(&dev_priv->bdev, type);
> +	struct ttm_mem_type_manager *man;
>  	struct vmwgfx_gmrid_man *gman =
>  		kzalloc(sizeof(*gman), GFP_KERNEL);
>  
>  	if (unlikely(!gman))
>  		return -ENOMEM;
>  
> +	man = &gman->manager;
> +
>  	man->func = &vmw_gmrid_manager_func;
>  	man->available_caching = TTM_PL_FLAG_CACHED;
>  	man->default_caching = TTM_PL_FLAG_CACHED;
> @@ -127,8 +133,7 @@ int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
>  	default:
>  		BUG();
>  	}
> -	man->priv = (void *) gman;
> -
> +	ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager);
>  	ttm_mem_type_manager_set_used(man, true);
>  	return 0;
>  }
> @@ -136,19 +141,18 @@ int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
>  void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
>  {
>  	struct ttm_mem_type_manager *man = ttm_manager_type(&dev_priv->bdev, type);
> -	struct vmwgfx_gmrid_man *gman =
> -		(struct vmwgfx_gmrid_man *)man->priv;
> +	struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
>  
>  	ttm_mem_type_manager_disable(man);
>  
>  	ttm_mem_type_manager_force_list_clean(&dev_priv->bdev, man);
>  
> -	if (gman) {

Ah, here it goes, please disregard my suggestion earlier for adding a
WARN_ON, that's just churn.

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

> -		ida_destroy(&gman->gmr_ida);
> -		kfree(gman);
> -	}
> -
>  	ttm_mem_type_manager_cleanup(man);
> +
> +	ttm_set_driver_manager(&dev_priv->bdev, type, NULL);
> +	ida_destroy(&gman->gmr_ida);
> +	kfree(gman);
> +
>  }
>  
>  static const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
> -- 
> 2.26.2
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch