[PATCH v2 13/15] drm/i915/tdr: Export reset count info to debugfs

[Arun Siluvery <arun.siluvery@linux.intel.com>]

A new variable is added to export the reset counts to debugfs, this
includes full gpu reset and engine reset count. This is useful for tests
where they areexpected to trigger reset; these counts are checked before
and after the test to ensure the same.

Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 5b75266..b02ca7a 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4814,6 +4814,38 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_wedged_fops,
 			i915_wedged_get, i915_wedged_set,
 			"%llu\n");
 
+
+static ssize_t i915_reset_info_read(struct file *filp, char __user *ubuf,
+				    size_t max, loff_t *ppos)
+{
+	int len;
+	char buf[300];
+	struct drm_device *dev = filp->private_data;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct i915_gpu_error *error = &dev_priv->gpu_error;
+	struct intel_engine_cs *engine;
+
+	len = scnprintf(buf, sizeof(buf), "full gpu reset = %u\n",
+			i915_reset_count(error));
+
+	for_each_engine(engine, dev_priv) {
+		len += scnprintf(buf + len, sizeof(buf) - len,
+				 "%s = %u\n", engine->name,
+				 i915_engine_reset_count(error, engine));
+	}
+
+	len += scnprintf(buf + len - 1, sizeof(buf) - len, "\n");
+
+	return simple_read_from_buffer(ubuf, max, ppos, buf, len);
+}
+
+static const struct file_operations i915_reset_info_fops = {
+	.owner = THIS_MODULE,
+	.open = simple_open,
+	.read = i915_reset_info_read,
+	.llseek = default_llseek,
+};
+
 static int
 i915_ring_stop_get(void *data, u64 *val)
 {
@@ -5474,6 +5506,7 @@ static const struct i915_debugfs_files {
 	const struct file_operations *fops;
 } i915_debugfs_files[] = {
 	{"i915_wedged", &i915_wedged_fops},
+	{"i915_reset_info", &i915_reset_info_fops},
 	{"i915_max_freq", &i915_max_freq_fops},
 	{"i915_min_freq", &i915_min_freq_fops},
 	{"i915_cache_sharing", &i915_cache_sharing_fops},
-- 
1.9.1

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