drm/i915: Add stats for GuC log buffer flush interrupts

GuC firmware sends an interrupt to flush the log buffer when it
becomes half full. GuC firmware also tracks how many times the
buffer overflowed.
It would be useful to maintain a statistics of how many flush
interrupts were received and for which type of log buffer,
along with the overflow count of each buffer type.
Augmented i915_log_info debugfs to report back these statistics.

v2:
- Update the logic to detect multiple overflows between the 2
  flush interrupts and also log a message for overflow (Tvrtko)
- Track the number of times there was no free sub buffer to capture
  the GuC log buffer. (Tvrtko)

v3:
- Fix the printf field width for overflow counter, set it to 10 as per the
  max value of u32, which takes 10 digits in decimal form. (Tvrtko)

v4:
- Move the log buffer overflow handling to a new function for better
  readability. (Tvrtko)

Signed-off-by: Akash Goel <akash.goel@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 253c22109c3f..9111cfdf217a 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1691,6 +1691,8 @@ static void gen9_guc_irq_handler(struct drm_i915_private *dev_priv, u32 gt_iir)
 			/* Handle flush interrupt in bottom half */
 			queue_work(dev_priv->guc.log.flush_wq,
 				   &dev_priv->guc.log.flush_work);
+
+			dev_priv->guc.log.flush_interrupt_count++;
 		} else {
 			/* Not clearing of unhandled event bits won't result in
 			 * re-triggering of the interrupt.