drm/i915: Include the kernel uptime in the error state

As well as knowing when the error occurred, it is more interesting to me
to know how long after booting the error occurred, and for good measure
record the time since last hw initialisation.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161025121602.1457-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -746,6 +746,8 @@ struct intel_display_error_state;
 struct drm_i915_error_state {
 	struct kref ref;
 	struct timeval time;
+	struct timeval boottime;
+	struct timeval uptime;
 
 	struct drm_i915_private *i915;
 
@@ -2099,6 +2101,8 @@ struct drm_i915_private {
 		 * off the idle_work.
 		 */
 		struct delayed_work idle_work;
+
+		ktime_t last_init_time;
 	} gt;
 
 	/* perform PHY state sanity checks? */

drivers/gpu/drm/i915/i915_gem.c

@@ -4470,6 +4470,8 @@ i915_gem_init_hw(struct drm_device *dev)
 	enum intel_engine_id id;
 	int ret;
 
+	dev_priv->gt.last_init_time = ktime_get();
+
 	/* Double layer security blanket, see i915_gem_init() */
 	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
 

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -546,9 +546,13 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
 	}
 
 	err_printf(m, "%s\n", error->error_msg);
-	err_printf(m, "Time: %ld s %ld us\n", error->time.tv_sec,
-		   error->time.tv_usec);
 	err_printf(m, "Kernel: " UTS_RELEASE "\n");
+	err_printf(m, "Time: %ld s %ld us\n",
+		   error->time.tv_sec, error->time.tv_usec);
+	err_printf(m, "Boottime: %ld s %ld us\n",
+		   error->boottime.tv_sec, error->boottime.tv_usec);
+	err_printf(m, "Uptime: %ld s %ld us\n",
+		   error->uptime.tv_sec, error->uptime.tv_usec);
 	err_print_capabilities(m, &error->device_info);
 	max_hangcheck_score = 0;
 	for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
@@ -1549,6 +1553,10 @@ static int capture(void *data)
 	i915_gem_capture_guc_log_buffer(error->i915, error);
 
 	do_gettimeofday(&error->time);
+	error->boottime = ktime_to_timeval(ktime_get_boottime());
+	error->uptime =
+		ktime_to_timeval(ktime_sub(ktime_get(),
+					   error->i915->gt.last_init_time));
 
 	error->overlay = intel_overlay_capture_error_state(error->i915);
 	error->display = intel_display_capture_error_state(error->i915);