[PATCH v9 23/26] drm/xe/vram: Update handling of xe_force_wake_get return

[Nirmoy Das]

On 10/14/2024 9:55 AM, Himal Prasad Ghimiray wrote:
> xe_force_wake_get() now returns the reference count-incremented domain
> mask. If it fails for individual domains, the return value will always
> be 0. However, for XE_FORCEWAKE_ALL, it may return a non-zero value even
> in the event of failure. Update the return handling of xe_force_wake_get()
> to reflect this behavior, and ensure that the return value is passed as
> input to xe_force_wake_put().
>
> v3
> - return xe_wakeref_t instead of int in xe_force_wake_get()
> - xe_force_wake_put() error doesn't need to be escalated/considered as
> probing error. It internally WARNS on domain ack failure.
>
> v5
> - return unsigned int from xe_force_wake_get()
>
> v7
> - Fix commit message
>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Lucas De Marchi <lucas.demarchi at intel.com>
> Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>

Reviewed-by: Nirmoy Das <nirmoy.das at intel.com>

> ---
>  drivers/gpu/drm/xe/xe_vram.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/xe/xe_vram.c b/drivers/gpu/drm/xe/xe_vram.c
> index 2a623bfcda7e..b1f81dca610d 100644
> --- a/drivers/gpu/drm/xe/xe_vram.c
> +++ b/drivers/gpu/drm/xe/xe_vram.c
> @@ -220,8 +220,8 @@ static int tile_vram_size(struct xe_tile *tile, u64 *vram_size,
>  {
>  	struct xe_device *xe = tile_to_xe(tile);
>  	struct xe_gt *gt = tile->primary_gt;
> +	unsigned int fw_ref;
>  	u64 offset;
> -	int err;
>  	u32 reg;
>  
>  	if (IS_SRIOV_VF(xe)) {
> @@ -240,9 +240,9 @@ static int tile_vram_size(struct xe_tile *tile, u64 *vram_size,
>  		return 0;
>  	}
>  
> -	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> -	if (err)
> -		return err;
> +	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> +	if (!fw_ref)
> +		return -ETIMEDOUT;
>  
>  	/* actual size */
>  	if (unlikely(xe->info.platform == XE_DG1)) {
> @@ -264,7 +264,9 @@ static int tile_vram_size(struct xe_tile *tile, u64 *vram_size,
>  	/* remove the tile offset so we have just the available size */
>  	*vram_size = offset - *tile_offset;
>  
> -	return xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
> +	xe_force_wake_put(gt_to_fw(gt), fw_ref);
> +
> +	return 0;
>  }
>  
>  static void vram_fini(void *arg)