[Intel-gfx] [PATCH v2] drm/i915: Show RPS autotuning thresholds along with waitboost

[Chris Wilson]

For convenience when debugging user issues show the autotuning
RPS parameters in debugfs/i915_rps_boost_info.

v2: Refine the presentation

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: fritsch at kodi.tv
---
 drivers/gpu/drm/i915/i915_debugfs.c | 43 +++++++++++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index c461072da142..8d302906d768 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2441,6 +2441,16 @@ static int count_irq_waiters(struct drm_i915_private *i915)
 	return count;
 }
 
+static const char *rps_power_to_str(int power)
+{
+	switch (power) {
+	default: return "unknown";
+	case LOW_POWER: return "low power";
+	case BETWEEN: return "mixed";
+	case HIGH_POWER: return "high power";
+	}
+}
+
 static int i915_rps_boost_info(struct seq_file *m, void *data)
 {
 	struct drm_info_node *node = m->private;
@@ -2452,12 +2462,17 @@ static int i915_rps_boost_info(struct seq_file *m, void *data)
 	seq_printf(m, "GPU busy? %s [%x]\n",
 		   yesno(dev_priv->gt.awake), dev_priv->gt.active_engines);
 	seq_printf(m, "CPU waiting? %d\n", count_irq_waiters(dev_priv));
-	seq_printf(m, "Frequency requested %d; min hard:%d, soft:%d; max soft:%d, hard:%d\n",
-		   intel_gpu_freq(dev_priv, dev_priv->rps.cur_freq),
+	seq_printf(m, "Frequency requested %d\n",
+		   intel_gpu_freq(dev_priv, dev_priv->rps.cur_freq));
+	seq_printf(m, "  min hard:%d, soft:%d; max soft:%d, hard:%d\n",
 		   intel_gpu_freq(dev_priv, dev_priv->rps.min_freq),
 		   intel_gpu_freq(dev_priv, dev_priv->rps.min_freq_softlimit),
 		   intel_gpu_freq(dev_priv, dev_priv->rps.max_freq_softlimit),
 		   intel_gpu_freq(dev_priv, dev_priv->rps.max_freq));
+	seq_printf(m, "  idle:%d, efficient:%d, boost:%d\n",
+		   intel_gpu_freq(dev_priv, dev_priv->rps.idle_freq),
+		   intel_gpu_freq(dev_priv, dev_priv->rps.efficient_freq),
+		   intel_gpu_freq(dev_priv, dev_priv->rps.boost_freq));
 
 	mutex_lock(&dev->filelist_mutex);
 	spin_lock(&dev_priv->rps.client_lock);
@@ -2478,6 +2493,30 @@ static int i915_rps_boost_info(struct seq_file *m, void *data)
 	spin_unlock(&dev_priv->rps.client_lock);
 	mutex_unlock(&dev->filelist_mutex);
 
+	if (INTEL_GEN(dev_priv) >= 6 &&
+	    dev_priv->rps.enabled &&
+	    dev_priv->gt.active_engines) {
+		u32 rpupei, rpcurup;
+		u32 rpdownei, rpcurdown;
+
+		intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
+		rpupei = I915_READ_FW(GEN6_RP_CUR_UP_EI) & GEN6_CURICONT_MASK;
+		rpcurup = I915_READ_FW(GEN6_RP_CUR_UP) & GEN6_CURBSYTAVG_MASK;
+		rpdownei = I915_READ_FW(GEN6_RP_CUR_DOWN_EI) & GEN6_CURIAVG_MASK;
+		rpcurdown = I915_READ_FW(GEN6_RP_CUR_DOWN) & GEN6_CURBSYTAVG_MASK;
+		intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
+
+		seq_printf(m, "\nRPS Autotuning (current \"%s\" window):\n",
+			   rps_power_to_str(dev_priv->rps.power));
+		seq_printf(m, "  Avg. up: %d%% [above threshold? %d%%]\n",
+			   100*rpcurup/rpupei,
+			   dev_priv->rps.up_threshold);
+		seq_printf(m, "  Avg. down: %d%% [below threshold? %d%%]\n",
+			   100*rpcurdown/rpdownei,
+			   dev_priv->rps.down_threshold);
+	} else
+		seq_printf(m, "\nRPS Autotuning inactive\n");
+
 	return 0;
 }
 
-- 
2.8.1