drm/i915: Show RPS autotuning thresholds along with waitboost

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

v2: Refine the presentation
v3: Style

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: fritsch@kodi.tv
Link: http://patchwork.freedesktop.org/patch/msgid/1471181336-27523-1-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: David Weinehall <david.weinehall@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1471250973-31277-1-git-send-email-chris@chris-wilson.co.uk

2 files changed, 50 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index c461072..a7ee7d6 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2441,6 +2441,20 @@ static int count_irq_waiters(struct drm_i915_private *i915)
 	return count;
 }
 
+static const char *rps_power_to_str(unsigned int power)
+{
+	static const char * const strings[] = {
+		[LOW_POWER] = "low power",
+		[BETWEEN] = "mixed",
+		[HIGH_POWER] = "high power",
+	};
+
+	if (power >= ARRAY_SIZE(strings) || !strings[power])
+		return "unknown";
+
+	return strings[power];
+}
+
 static int i915_rps_boost_info(struct seq_file *m, void *data)
 {
 	struct drm_info_node *node = m->private;
@@ -2452,12 +2466,17 @@ 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 +2497,31 @@ 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 rpup, rpupei;
+		u32 rpdown, rpdownei;
+
+		intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
+		rpup = I915_READ_FW(GEN6_RP_CUR_UP) & GEN6_RP_EI_MASK;
+		rpupei = I915_READ_FW(GEN6_RP_CUR_UP_EI) & GEN6_RP_EI_MASK;
+		rpdown = I915_READ_FW(GEN6_RP_CUR_DOWN) & GEN6_RP_EI_MASK;
+		rpdownei = I915_READ_FW(GEN6_RP_CUR_DOWN_EI) & GEN6_RP_EI_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 * rpup / rpupei,
+			   dev_priv->rps.up_threshold);
+		seq_printf(m, "  Avg. down: %d%% [below threshold? %d%%]\n",
+			   100 * rpdown / rpdownei,
+			   dev_priv->rps.down_threshold);
+	} else {
+		seq_puts(m, "\nRPS Autotuning inactive\n");
+	}
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index da82744..d4adf28 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7036,12 +7036,13 @@ enum {
 #define GEN6_RP_UP_THRESHOLD			_MMIO(0xA02C)
 #define GEN6_RP_DOWN_THRESHOLD			_MMIO(0xA030)
 #define GEN6_RP_CUR_UP_EI			_MMIO(0xA050)
-#define   GEN6_CURICONT_MASK			0xffffff
+#define   GEN6_RP_EI_MASK			0xffffff
+#define   GEN6_CURICONT_MASK			GEN6_RP_EI_MASK
 #define GEN6_RP_CUR_UP				_MMIO(0xA054)
-#define   GEN6_CURBSYTAVG_MASK			0xffffff
+#define   GEN6_CURBSYTAVG_MASK			GEN6_RP_EI_MASK
 #define GEN6_RP_PREV_UP				_MMIO(0xA058)
 #define GEN6_RP_CUR_DOWN_EI			_MMIO(0xA05C)
-#define   GEN6_CURIAVG_MASK			0xffffff
+#define   GEN6_CURIAVG_MASK			GEN6_RP_EI_MASK
 #define GEN6_RP_CUR_DOWN			_MMIO(0xA060)
 #define GEN6_RP_PREV_DOWN			_MMIO(0xA064)
 #define GEN6_RP_UP_EI				_MMIO(0xA068)