From a1b58ee3cb34c433167b7b7d3465ab3ca0e3daf1 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Sun, 6 Oct 2019 17:49:54 +0100 Subject: [PATCH] drm/i915/gt: Treat a busy timeline as 'active' while waiting If we cannot claim the timeline->mutex while preparing for a wait on it, we have to skip the timeline. In doing so, treat it as active so that under a intel_gt_wait_for_idle() loop, we repeat the wait after scheduling away. Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Reviewed-by: Tvrtko Ursulin Link: https://patchwork.freedesktop.org/patch/msgid/20191006165002.30312-4-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/gt/intel_gt_requests.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/intel_gt_requests.c b/drivers/gpu/drm/i915/gt/intel_gt_requests.c index d69e784..ca606b7 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_requests.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_requests.c @@ -34,8 +34,10 @@ long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout) spin_lock_irqsave(&timelines->lock, flags); list_for_each_entry_safe(tl, tn, &timelines->active_list, link) { - if (!mutex_trylock(&tl->mutex)) + if (!mutex_trylock(&tl->mutex)) { + active_count++; /* report busy to caller, try again? */ continue; + } intel_timeline_get(tl); GEM_BUG_ON(!tl->active_count); -- 2.7.4