[Intel-gfx] [PATCH 4/4] drm/i915: Expose SAGV state via debugfs

[Jani Nikula]

On Tue, 31 Jan 2023, Ville Syrjala <ville.syrjala at linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Since SAGV is controlled via unidirectional pcode commands
> we have no way to query the current state. So instead let's
> expose the last programmed state via debugfs. This way we
> can at least know whether SAGV should be enabled or not
> (which can be important to know when dealing with underruns/etc.).
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Reviewed-by: Jani Nikula <jani.nikula at intel.com>

> ---
>  .../drm/i915/display/intel_display_debugfs.c  |  2 +-
>  drivers/gpu/drm/i915/display/skl_watermark.c  | 31 ++++++++++++++++---
>  drivers/gpu/drm/i915/display/skl_watermark.h  |  2 +-
>  3 files changed, 28 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> index 7bcd90384a46..9e2fb8626c96 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> @@ -1622,7 +1622,7 @@ void intel_display_debugfs_register(struct drm_i915_private *i915)
>  	intel_dmc_debugfs_register(i915);
>  	intel_fbc_debugfs_register(i915);
>  	intel_hpd_debugfs_register(i915);
> -	skl_watermark_ipc_debugfs_register(i915);
> +	skl_watermark_debugfs_register(i915);
>  }
>  
>  static int i915_panel_show(struct seq_file *m, void *data)
> diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c
> index 5916694f147c..022aed8dd440 100644
> --- a/drivers/gpu/drm/i915/display/skl_watermark.c
> +++ b/drivers/gpu/drm/i915/display/skl_watermark.c
> @@ -3545,13 +3545,34 @@ static const struct file_operations skl_watermark_ipc_status_fops = {
>  	.write = skl_watermark_ipc_status_write
>  };
>  
> -void skl_watermark_ipc_debugfs_register(struct drm_i915_private *i915)
> +static int intel_sagv_status_show(struct seq_file *m, void *unused)
> +{
> +	struct drm_i915_private *i915 = m->private;
> +	static const char * const sagv_status[] = {
> +		[I915_SAGV_UNKNOWN] = "unknown",
> +		[I915_SAGV_DISABLED] = "disabled",
> +		[I915_SAGV_ENABLED] = "enabled",
> +		[I915_SAGV_NOT_CONTROLLED] = "not controlled",
> +	};
> +
> +	seq_printf(m, "SAGV available: %s\n", str_yes_no(intel_has_sagv(i915)));
> +	seq_printf(m, "SAGV status: %s\n", sagv_status[i915->display.sagv.status]);
> +	seq_printf(m, "SAGV block time: %d usec\n", i915->display.sagv.block_time_us);
> +
> +	return 0;
> +}
> +
> +DEFINE_SHOW_ATTRIBUTE(intel_sagv_status);
> +
> +void skl_watermark_debugfs_register(struct drm_i915_private *i915)
>  {
>  	struct drm_minor *minor = i915->drm.primary;
>  
> -	if (!HAS_IPC(i915))
> -		return;
> +	if (HAS_IPC(i915))
> +		debugfs_create_file("i915_ipc_status", 0644, minor->debugfs_root, i915,
> +				    &skl_watermark_ipc_status_fops);
>  
> -	debugfs_create_file("i915_ipc_status", 0644, minor->debugfs_root, i915,
> -			    &skl_watermark_ipc_status_fops);
> +	if (HAS_SAGV(i915))
> +		debugfs_create_file("i915_sagv_status", 0444, minor->debugfs_root, i915,
> +				    &intel_sagv_status_fops);
>  }
> diff --git a/drivers/gpu/drm/i915/display/skl_watermark.h b/drivers/gpu/drm/i915/display/skl_watermark.h
> index 37954c472070..1f81e1a5a4a3 100644
> --- a/drivers/gpu/drm/i915/display/skl_watermark.h
> +++ b/drivers/gpu/drm/i915/display/skl_watermark.h
> @@ -47,7 +47,7 @@ void intel_wm_state_verify(struct intel_crtc *crtc,
>  void skl_watermark_ipc_init(struct drm_i915_private *i915);
>  void skl_watermark_ipc_update(struct drm_i915_private *i915);
>  bool skl_watermark_ipc_enabled(struct drm_i915_private *i915);
> -void skl_watermark_ipc_debugfs_register(struct drm_i915_private *i915);
> +void skl_watermark_debugfs_register(struct drm_i915_private *i915);
>  
>  void skl_wm_init(struct drm_i915_private *i915);

-- 
Jani Nikula, Intel Open Source Graphics Center