drm/i915/guc: Update intel_gt_wait_for_idle to work with GuC

When running the GuC the GPU can't be considered idle if the GuC still
has contexts pinned. As such, a call has been added in
intel_gt_wait_for_idle to idle the UC and in turn the GuC by waiting for
the number of unpinned contexts to go to zero.

v2: rtimeout -> remaining_timeout
v3: Drop unnecessary includes, guc_submission_busy_loop ->
guc_submission_send_busy_loop, drop negatie timeout trick, move a
refactor of guc_context_unpin to earlier path (John H)
v4: Add stddef.h back into intel_gt_requests.h, sort circuit idle
function if not in GuC submission mode

Cc: John Harrison <john.c.harrison@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210721215101.139794-16-matthew.brost@intel.com

1 files changed, 5 insertions, 16 deletions

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_requests.c b/drivers/gpu/drm/i915/gt/intel_gt_requests.c
index 647eca9d867a..edb881d75630 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_requests.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_requests.c
@@ -130,7 +130,8 @@ void intel_engine_fini_retire(struct intel_engine_cs *engine)
 	GEM_BUG_ON(engine->retire);
 }
 
-long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout)
+long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout,
+				      long *remaining_timeout)
 {
 	struct intel_gt_timelines *timelines = &gt->timelines;
 	struct intel_timeline *tl, *tn;
@@ -195,22 +196,10 @@ out_active:	spin_lock(&timelines->lock);
 	if (flush_submission(gt, timeout)) /* Wait, there's more! */
 		active_count++;
 
-	return active_count ? timeout : 0;
-}
-
-int intel_gt_wait_for_idle(struct intel_gt *gt, long timeout)
-{
-	/* If the device is asleep, we have no requests outstanding */
-	if (!intel_gt_pm_is_awake(gt))
-		return 0;
-
-	while ((timeout = intel_gt_retire_requests_timeout(gt, timeout)) > 0) {
-		cond_resched();
-		if (signal_pending(current))
-			return -EINTR;
-	}
+	if (remaining_timeout)
+		*remaining_timeout = timeout;
 
-	return timeout;
+	return active_count ? timeout : 0;
 }
 
 static void retire_work_handler(struct work_struct *work)