[Intel-gfx] [PATCH 01/26] drm/i915: Split out verbose PPGTT dumping

[Ben Widawsky]

There often is not enough memory to dump the full contents of the PPGTT.
As a temporary bandage, to continue getting valuable basic PPGTT info,
wrap the dangerous, memory hungry part inside of a new verbose version
of the debugfs file.

Also while here we can split out the ppgtt print function so it's more
reusable.

I'd really like to get ppgtt info into our error state, but I found it too
difficult to make work in the limited time I have. Maybe Mika can find a way.

Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1031c43..b226788 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1760,7 +1760,7 @@ static int per_file_ctx(int id, void *ptr, void *data)
 	return 0;
 }
 
-static void gen8_ppgtt_info(struct seq_file *m, struct drm_device *dev)
+static void gen8_ppgtt_info(struct seq_file *m, struct drm_device *dev, int verbose)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_ring_buffer *ring;
@@ -1785,7 +1785,13 @@ static void gen8_ppgtt_info(struct seq_file *m, struct drm_device *dev)
 	}
 }
 
-static void gen6_ppgtt_info(struct seq_file *m, struct drm_device *dev)
+static void print_ppgtt(struct seq_file *m, struct i915_hw_ppgtt *ppgtt, const char *name)
+{
+	seq_printf(m, "%s:\n", name);
+	seq_printf(m, "pd gtt offset: 0x%08x\n", ppgtt->pd_offset);
+}
+
+static void gen6_ppgtt_info(struct seq_file *m, struct drm_device *dev, bool verbose)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_ring_buffer *ring;
@@ -1806,10 +1812,9 @@ static void gen6_ppgtt_info(struct seq_file *m, struct drm_device *dev)
 	if (dev_priv->mm.aliasing_ppgtt) {
 		struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
 
-		seq_puts(m, "aliasing PPGTT:\n");
-		seq_printf(m, "pd gtt offset: 0x%08x\n", ppgtt->pd_offset);
-
-		ppgtt->debug_dump(ppgtt, m);
+		print_ppgtt(m, ppgtt, "Aliasing PPGTT");
+		if (verbose)
+			ppgtt->debug_dump(ppgtt, m);
 	} else
 		return;
 
@@ -1820,8 +1825,9 @@ static void gen6_ppgtt_info(struct seq_file *m, struct drm_device *dev)
 		pvt_ppgtt = ctx_to_ppgtt(file_priv->private_default_ctx);
 		seq_printf(m, "proc: %s\n",
 			   get_pid_task(file->pid, PIDTYPE_PID)->comm);
-		seq_puts(m, "  default context:\n");
-		idr_for_each(&file_priv->context_idr, per_file_ctx, m);
+		print_ppgtt(m, pvt_ppgtt, "Default context");
+		if (verbose)
+			idr_for_each(&file_priv->context_idr, per_file_ctx, m);
 	}
 	seq_printf(m, "ECOCHK: 0x%08x\n", I915_READ(GAM_ECOCHK));
 }
@@ -1831,6 +1837,7 @@ static int i915_ppgtt_info(struct seq_file *m, void *data)
 	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;
+	bool verbose = node->info_ent->data ? true : false;
 
 	int ret = mutex_lock_interruptible(&dev->struct_mutex);
 	if (ret)
@@ -1838,9 +1845,9 @@ static int i915_ppgtt_info(struct seq_file *m, void *data)
 	intel_runtime_pm_get(dev_priv);
 
 	if (INTEL_INFO(dev)->gen >= 8)
-		gen8_ppgtt_info(m, dev);
+		gen8_ppgtt_info(m, dev, verbose);
 	else if (INTEL_INFO(dev)->gen >= 6)
-		gen6_ppgtt_info(m, dev);
+		gen6_ppgtt_info(m, dev, verbose);
 
 	intel_runtime_pm_put(dev_priv);
 	mutex_unlock(&dev->struct_mutex);
@@ -3826,6 +3833,7 @@ static const struct drm_info_list i915_debugfs_list[] = {
 	{"i915_gen6_forcewake_count", i915_gen6_forcewake_count_info, 0},
 	{"i915_swizzle_info", i915_swizzle_info, 0},
 	{"i915_ppgtt_info", i915_ppgtt_info, 0},
+	{"i915_ppgtt_verbose_info", i915_ppgtt_info, 0, (void *)1},
 	{"i915_dpio", i915_dpio_info, 0},
 	{"i915_llc", i915_llc, 0},
 	{"i915_edp_psr_status", i915_edp_psr_status, 0},
-- 
1.9.0