drm/i915: drpc debugfs update for gen6

Many of the old fields from Ironlake have gone away. Strip all those
fields, and try to update to fields people care about. RC information
isn't exactly ideal anymore. All we can guarantee when we read the
register is that we're not using forcewake, ie. the software isn't
forcing the hardware to stay awake. The downside is that in doing this
we may wait a while and that causes an unnaturally idle state on the
GPU.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=42578
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 85 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 004b048..1180798 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1001,7 +1001,7 @@ static int i915_inttoext_table(struct seq_file *m, void *unused)
 	return 0;
 }
 
-static int i915_drpc_info(struct seq_file *m, void *unused)
+static int ironlake_drpc_info(struct seq_file *m)
 {
 	struct drm_info_node *node = (struct drm_info_node *) m->private;
 	struct drm_device *dev = node->minor->dev;
@@ -1068,6 +1068,90 @@ static int i915_drpc_info(struct seq_file *m, void *unused)
 	return 0;
 }
 
+static int gen6_drpc_info(struct seq_file *m)
+{
+
+	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;
+	u32 rpmodectl1, gt_core_status, rcctl1;
+	int count=0, ret;
+
+
+	ret = mutex_lock_interruptible(&dev->struct_mutex);
+	if (ret)
+		return ret;
+
+	if (atomic_read(&dev_priv->forcewake_count)) {
+		seq_printf(m, "RC information inaccurate because userspace "
+			      "holds a reference \n");
+	} else {
+		/* NB: we cannot use forcewake, else we read the wrong values */
+		while (count++ < 50 && (I915_READ_NOTRACE(FORCEWAKE_ACK) & 1))
+			udelay(10);
+		seq_printf(m, "RC information accurate: %s\n", yesno(count < 51));
+	}
+
+	gt_core_status = readl(dev_priv->regs + GEN6_GT_CORE_STATUS);
+	trace_i915_reg_rw(false, GEN6_GT_CORE_STATUS, gt_core_status, 4);
+
+	rpmodectl1 = I915_READ(GEN6_RP_CONTROL);
+	rcctl1 = I915_READ(GEN6_RC_CONTROL);
+	mutex_unlock(&dev->struct_mutex);
+
+	seq_printf(m, "Video Turbo Mode: %s\n",
+		   yesno(rpmodectl1 & GEN6_RP_MEDIA_TURBO));
+	seq_printf(m, "HW control enabled: %s\n",
+		   yesno(rpmodectl1 & GEN6_RP_ENABLE));
+	seq_printf(m, "SW control enabled: %s\n",
+		   yesno((rpmodectl1 & GEN6_RP_MEDIA_MODE_MASK) ==
+			  GEN6_RP_MEDIA_SW_MODE));
+	seq_printf(m, "RC6 Enabled: %s\n",
+		   yesno(rcctl1 & GEN6_RC_CTL_RC1e_ENABLE));
+	seq_printf(m, "RC6 Enabled: %s\n",
+		   yesno(rcctl1 & GEN6_RC_CTL_RC6_ENABLE));
+	seq_printf(m, "Deep RC6 Enabled: %s\n",
+		   yesno(rcctl1 & GEN6_RC_CTL_RC6p_ENABLE));
+	seq_printf(m, "Deepest RC6 Enabled: %s\n",
+		   yesno(rcctl1 & GEN6_RC_CTL_RC6pp_ENABLE));
+	seq_printf(m, "Current RC state: ");
+	switch (gt_core_status & GEN6_RCn_MASK) {
+	case GEN6_RC0:
+		if (gt_core_status & GEN6_CORE_CPD_STATE_MASK)
+			seq_printf(m, "Core Power Down\n");
+		else
+			seq_printf(m, "on\n");
+		break;
+	case GEN6_RC3:
+		seq_printf(m, "RC3\n");
+		break;
+	case GEN6_RC6:
+		seq_printf(m, "RC6\n");
+		break;
+	case GEN6_RC7:
+		seq_printf(m, "RC7\n");
+		break;
+	default:
+		seq_printf(m, "Unknown\n");
+		break;
+	}
+
+	seq_printf(m, "Core Power Down: %s\n",
+		   yesno(gt_core_status & GEN6_CORE_CPD_STATE_MASK));
+	return 0;
+}
+
+static int i915_drpc_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;
+
+	if (IS_GEN6(dev) || IS_GEN7(dev))
+		return gen6_drpc_info(m);
+	else
+		return ironlake_drpc_info(m);
+}
+
 static int i915_fbc_status(struct seq_file *m, void *unused)
 {
 	struct drm_info_node *node = (struct drm_info_node *) m->private;