[PATCH 09/56] drm/i915: Split out verbose PPGTT dumping

[Ben Widawsky <benjamin.widawsky@intel.com>]

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.

v2: Get the info for the non-default contexts. Merge a patch from Chris
into this patch (Chris). All credit goes to him.

References: 20140320115742.GA4463@nuc-i3427.alporthouse.com
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 49 +++++++++++++++++++++++--------------
 1 file changed, 30 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index d9c1414..4a0b1c8 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1812,18 +1812,13 @@ static int i915_swizzle_info(struct seq_file *m, void *data)
 	return 0;
 }
 
-static int per_file_ctx(int id, void *ptr, void *data)
+static void print_ppgtt(struct seq_file *m, struct i915_hw_ppgtt *ppgtt, const char *name)
 {
-	struct i915_hw_context *ctx = ptr;
-	struct seq_file *m = data;
-	struct i915_hw_ppgtt *ppgtt = ctx_to_ppgtt(ctx);
-
-	ppgtt->debug_dump(ppgtt, m);
-
-	return 0;
+	seq_printf(m, "%s:\n", name);
+	seq_printf(m, "pd gtt offset: 0x%08x\n", ppgtt->pd_offset);
 }
 
-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;
@@ -1847,7 +1842,21 @@ 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 int per_file_ctx(int id, void *ptr, void *data)
+{
+	struct i915_hw_context *ctx = ptr;
+	struct seq_file *m = data;
+	bool verbose = (unsigned long)data & 1;
+	struct i915_hw_ppgtt *ppgtt = ctx_to_ppgtt(ctx);
+
+	print_ppgtt(m, ppgtt, ctx->id == DEFAULT_CONTEXT_ID ? "Default context" : "User context");
+	if (verbose)
+		ppgtt->debug_dump(ppgtt, m);
+
+	return 0;
+}
+
+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;
@@ -1868,10 +1877,9 @@ 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;
 
@@ -1880,10 +1888,11 @@ static void gen6_ppgtt_info(struct seq_file *m, struct drm_device *dev)
 		struct i915_hw_ppgtt *pvt_ppgtt;
 
 		pvt_ppgtt = ctx_to_ppgtt(file_priv->private_default_ctx);
-		seq_printf(m, "proc: %s\n",
+		seq_printf(m, "\nproc: %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");
+		idr_for_each(&file_priv->context_idr, per_file_ctx,
+			     (void *)((unsigned long)m | verbose));
 	}
 	seq_printf(m, "ECOCHK: 0x%08x\n", I915_READ(GAM_ECOCHK));
 }
@@ -1893,6 +1902,7 @@ 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)
@@ -1900,9 +1910,9 @@ 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);
@@ -3843,6 +3853,7 @@ 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_llc", i915_llc, 0},
 	{"i915_edp_psr_status", i915_edp_psr_status, 0},
 	{"i915_sink_crc_eDP1", i915_sink_crc, 0},
-- 
1.9.2