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: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 71 +++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_drv.h | 3 ++
drivers/gpu/drm/i915/intel_pm.c | 12 +++++++
3 files changed, 86 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 6875b7a..68d9ed0 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -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;
@@ -3076,6 +3146,7 @@ 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)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 20d3b79..47b8fd1 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -966,6 +966,9 @@ 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;
};
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index ff798b8..a1a54ab 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5752,8 +5752,13 @@ 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);
}
@@ -5768,8 +5773,15 @@ 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);
}
--
1.8.4
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