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drm/i915/gt: Treat a busy timeline as 'active' while waiting

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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 <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191006165002.30312-4-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-10-06 17:49:54 +01:00
parent 1664f35aa7
commit a1b58ee3cb
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/gt/intel_gt_requests.c
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@ -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);