[FOR_CI 10/14] drm/i915/tdr: Add engine reset count to error state

[Arun Siluvery]

Driver maintains count of how many times a given engine is reset, useful to
capture this in error state also. It gives an idea of how engine is coping
up with the workloads it is executing before this error state.

Signed-off-by: Arun Siluvery <arun.siluvery at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h       | 7 +++++++
 drivers/gpu/drm/i915/i915_gpu_error.c | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d807a99..3c34201 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -519,6 +519,7 @@ struct drm_i915_error_state {
 		int hangcheck_score;
 		enum intel_ring_hangcheck_action hangcheck_action;
 		int num_requests;
+		u32 reset_count;
 
 		/* our own tracking of ring head and tail */
 		u32 cpu_ring_head;
@@ -3383,6 +3384,12 @@ static inline bool i915_engine_reset_in_progress(struct i915_gpu_error *error,
 	return test_bit(engine->id + 1, &error->flags);
 }
 
+static inline u32 i915_engine_reset_count(struct i915_gpu_error *error,
+					  struct intel_engine_cs *engine)
+{
+	return READ_ONCE(error->engine_reset_count[engine->id]);
+}
+
 void i915_gem_reset(struct drm_device *dev);
 void i915_gem_reset_engine_status(struct intel_engine_cs *ring);
 bool i915_gem_clflush_object(struct drm_i915_gem_object *obj, bool force);
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 9d73d22..1af6f2f 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -303,6 +303,7 @@ static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
 	err_printf(m, "  hangcheck: %s [%d]\n",
 		   hangcheck_action_to_str(ring->hangcheck_action),
 		   ring->hangcheck_score);
+	err_printf(m, "  engine reset count: %u\n", ring->reset_count);
 }
 
 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
@@ -1022,6 +1023,8 @@ static void i915_record_ring_state(struct drm_i915_private *dev_priv,
 
 	ering->hangcheck_score = engine->hangcheck.score;
 	ering->hangcheck_action = engine->hangcheck.action;
+	ering->reset_count = i915_engine_reset_count(&dev_priv->gpu_error,
+						     engine);
 
 	if (USES_PPGTT(dev_priv)) {
 		int i;
-- 
1.9.1