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Commit 1da51581 authored by Imre Deak's avatar Imre Deak Committed by Daniel Vetter
Browse files

drm/i915: add a debugfs entry for power domain info 



Add a debugfs entry showing the use-count for all power domains of each
power well.

v3: address comments from Paulo:
- simplify power_domain_str() by using a switch table
- move power_well::domain_count to power_domains
- WARN_ON decrementing a 0 refcount

Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Reviewed-by: default avatarPaulo Zanoni <paulo.zanoni@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 1c2256df

drivers/gpu/drm/i915/i915_debugfs.c

+71 −0
Original line number Diff line number Diff line
@@ -1844,6 +1844,76 @@ static int i915_pc8_status(struct seq_file *m, void *unused) 
	return 0;

}



static const char *power_domain_str(enum intel_display_power_domain domain)

{

	switch (domain) {

	case POWER_DOMAIN_PIPE_A:

		return "PIPE_A";

	case POWER_DOMAIN_PIPE_B:

		return "PIPE_B";

	case POWER_DOMAIN_PIPE_C:

		return "PIPE_C";

	case POWER_DOMAIN_PIPE_A_PANEL_FITTER:

		return "PIPE_A_PANEL_FITTER";

	case POWER_DOMAIN_PIPE_B_PANEL_FITTER:

		return "PIPE_B_PANEL_FITTER";

	case POWER_DOMAIN_PIPE_C_PANEL_FITTER:

		return "PIPE_C_PANEL_FITTER";

	case POWER_DOMAIN_TRANSCODER_A:

		return "TRANSCODER_A";

	case POWER_DOMAIN_TRANSCODER_B:

		return "TRANSCODER_B";

	case POWER_DOMAIN_TRANSCODER_C:

		return "TRANSCODER_C";

	case POWER_DOMAIN_TRANSCODER_EDP:

		return "TRANSCODER_EDP";

	case POWER_DOMAIN_VGA:

		return "VGA";

	case POWER_DOMAIN_AUDIO:

		return "AUDIO";

	case POWER_DOMAIN_INIT:

		return "INIT";

	default:

		WARN_ON(1);

		return "?";

	}

}



static int i915_power_domain_info(struct seq_file *m, void *unused)

{

	struct drm_info_node *node = (struct drm_info_node *) m->private;

	struct drm_device *dev = node->minor->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct i915_power_domains *power_domains = &dev_priv->power_domains;

	int i;



	mutex_lock(&power_domains->lock);



	seq_printf(m, "%-25s %s\n", "Power well/domain", "Use count");

	for (i = 0; i < power_domains->power_well_count; i++) {

		struct i915_power_well *power_well;

		enum intel_display_power_domain power_domain;



		power_well = &power_domains->power_wells[i];

		seq_printf(m, "%-25s %d\n", power_well->name,

			   power_well->count);



		for (power_domain = 0; power_domain < POWER_DOMAIN_NUM;

		     power_domain++) {

			if (!(BIT(power_domain) & power_well->domains))

				continue;



			seq_printf(m, "  %-23s %d\n",

				 power_domain_str(power_domain),

				 power_domains->domain_use_count[power_domain]);

		}

	}



	mutex_unlock(&power_domains->lock);



	return 0;

}



struct pipe_crc_info {

	const char *name;

	struct drm_device *dev;
@@ -3079,6 +3149,7 @@ static const struct drm_info_list i915_debugfs_list[] = { 
	{"i915_edp_psr_status", i915_edp_psr_status, 0},

	{"i915_energy_uJ", i915_energy_uJ, 0},

	{"i915_pc8_status", i915_pc8_status, 0},

	{"i915_power_domain_info", i915_power_domain_info, 0},

};

#define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)

drivers/gpu/drm/i915/i915_drv.h

+3 −0
Original line number Diff line number Diff line
@@ -971,6 +971,9 @@ struct i915_power_domains { 
	int power_well_count;



	struct mutex lock;

#if IS_ENABLED(CONFIG_DEBUG_FS)

	int domain_use_count[POWER_DOMAIN_NUM];

#endif

	struct i915_power_well *power_wells;

};

drivers/gpu/drm/i915/intel_pm.c

+12 −0
Original line number Diff line number Diff line
@@ -5754,8 +5754,13 @@ void intel_display_power_get(struct drm_device *dev, 
	power_domains = &dev_priv->power_domains;



	mutex_lock(&power_domains->lock);



#if IS_ENABLED(CONFIG_DEBUG_FS)

	power_domains->domain_use_count[domain]++;

#endif

	for_each_power_well(i, power_well, BIT(domain), power_domains)

		__intel_power_well_get(dev, power_well);



	mutex_unlock(&power_domains->lock);

}
@@ -5770,8 +5775,15 @@ void intel_display_power_put(struct drm_device *dev, 
	power_domains = &dev_priv->power_domains;



	mutex_lock(&power_domains->lock);



	for_each_power_well_rev(i, power_well, BIT(domain), power_domains)

		__intel_power_well_put(dev, power_well);



#if IS_ENABLED(CONFIG_DEBUG_FS)

	WARN_ON(!power_domains->domain_use_count[domain]);

	power_domains->domain_use_count[domain]--;

#endif



	mutex_unlock(&power_domains->lock);

}