[PATCH v9 19/26] drm/xe/pat: 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 checked. It internally
> WARNS on domain ack failure.
> - don't use xe_assert() to report HW errors (Michal)
>
> v5
> - return unsigned int from xe_force_wake_get()
> - remove redundant warns
>
> v7
> - Fix commit message
> - Remove redundant header
>
> Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
> 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_pat.c | 65 +++++++++++++++++--------------------
>  1 file changed, 30 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/gpu/drm/xe/xe_pat.c b/drivers/gpu/drm/xe/xe_pat.c
> index b16473818173..30fdbdb9341e 100644
> --- a/drivers/gpu/drm/xe/xe_pat.c
> +++ b/drivers/gpu/drm/xe/xe_pat.c
> @@ -182,11 +182,12 @@ static void program_pat_mcr(struct xe_gt *gt, const struct xe_pat_table_entry ta
>  static void xelp_dump(struct xe_gt *gt, struct drm_printer *p)
>  {
>  	struct xe_device *xe = gt_to_xe(gt);
> -	int i, err;
> +	unsigned int fw_ref;
> +	int i;
>  
> -	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> -	if (err)
> -		goto err_fw;
> +	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> +	if (!fw_ref)
> +		return;
>  
>  	drm_printf(p, "PAT table:\n");
>  
> @@ -198,9 +199,7 @@ static void xelp_dump(struct xe_gt *gt, struct drm_printer *p)
>  			   XELP_MEM_TYPE_STR_MAP[mem_type], pat);
>  	}
>  
> -	err = xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
> -err_fw:
> -	xe_assert(xe, !err);
> +	xe_force_wake_put(gt_to_fw(gt), fw_ref);
>  }
>  
>  static const struct xe_pat_ops xelp_pat_ops = {
> @@ -211,11 +210,12 @@ static const struct xe_pat_ops xelp_pat_ops = {
>  static void xehp_dump(struct xe_gt *gt, struct drm_printer *p)
>  {
>  	struct xe_device *xe = gt_to_xe(gt);
> -	int i, err;
> +	unsigned int fw_ref;
> +	int i;
>  
> -	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> -	if (err)
> -		goto err_fw;
> +	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> +	if (!fw_ref)
> +		return;
>  
>  	drm_printf(p, "PAT table:\n");
>  
> @@ -229,9 +229,7 @@ static void xehp_dump(struct xe_gt *gt, struct drm_printer *p)
>  			   XELP_MEM_TYPE_STR_MAP[mem_type], pat);
>  	}
>  
> -	err = xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
> -err_fw:
> -	xe_assert(xe, !err);
> +	xe_force_wake_put(gt_to_fw(gt), fw_ref);
>  }
>  
>  static const struct xe_pat_ops xehp_pat_ops = {
> @@ -242,11 +240,12 @@ static const struct xe_pat_ops xehp_pat_ops = {
>  static void xehpc_dump(struct xe_gt *gt, struct drm_printer *p)
>  {
>  	struct xe_device *xe = gt_to_xe(gt);
> -	int i, err;
> +	unsigned int fw_ref;
> +	int i;
>  
> -	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> -	if (err)
> -		goto err_fw;
> +	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> +	if (!fw_ref)
> +		return;
>  
>  	drm_printf(p, "PAT table:\n");
>  
> @@ -258,9 +257,7 @@ static void xehpc_dump(struct xe_gt *gt, struct drm_printer *p)
>  			   REG_FIELD_GET(XEHPC_CLOS_LEVEL_MASK, pat), pat);
>  	}
>  
> -	err = xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
> -err_fw:
> -	xe_assert(xe, !err);
> +	xe_force_wake_put(gt_to_fw(gt), fw_ref);
>  }
>  
>  static const struct xe_pat_ops xehpc_pat_ops = {
> @@ -271,11 +268,12 @@ static const struct xe_pat_ops xehpc_pat_ops = {
>  static void xelpg_dump(struct xe_gt *gt, struct drm_printer *p)
>  {
>  	struct xe_device *xe = gt_to_xe(gt);
> -	int i, err;
> +	unsigned int fw_ref;
> +	int i;
>  
> -	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> -	if (err)
> -		goto err_fw;
> +	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> +	if (!fw_ref)
> +		return;
>  
>  	drm_printf(p, "PAT table:\n");
>  
> @@ -292,9 +290,7 @@ static void xelpg_dump(struct xe_gt *gt, struct drm_printer *p)
>  			   REG_FIELD_GET(XELPG_INDEX_COH_MODE_MASK, pat), pat);
>  	}
>  
> -	err = xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
> -err_fw:
> -	xe_assert(xe, !err);
> +	xe_force_wake_put(gt_to_fw(gt), fw_ref);
>  }
>  
>  /*
> @@ -330,12 +326,13 @@ static void xe2lpm_program_pat(struct xe_gt *gt, const struct xe_pat_table_entry
>  static void xe2_dump(struct xe_gt *gt, struct drm_printer *p)
>  {
>  	struct xe_device *xe = gt_to_xe(gt);
> -	int i, err;
> +	unsigned int fw_ref;
>  	u32 pat;
> +	int i;
>  
> -	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> -	if (err)
> -		goto err_fw;
> +	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> +	if (!fw_ref)
> +		return;
>  
>  	drm_printf(p, "PAT table:\n");
>  
> @@ -374,9 +371,7 @@ static void xe2_dump(struct xe_gt *gt, struct drm_printer *p)
>  		   REG_FIELD_GET(XE2_COH_MODE, pat),
>  		   pat);
>  
> -	err = xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
> -err_fw:
> -	xe_assert(xe, !err);
> +	xe_force_wake_put(gt_to_fw(gt), fw_ref);
>  }
>  
>  static const struct xe_pat_ops xe2_pat_ops = {