diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2017-03-16 00:07:25 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2017-03-16 00:45:40 +0300 |
| commit | 908a6cbf84db77f33d8522f8ff9d9bf34dd7441f (patch) | |
| tree | ec8f41b8b5c3eed6cdb804863f003a51ebd8926e /drivers/gpu/drm/i915/intel_breadcrumbs.c | |
| parent | a5cae7b8edefe01a77ad6288367026f65fbfb91d (diff) | |
| download | linux-908a6cbf84db77f33d8522f8ff9d9bf34dd7441f.tar.xz | |
drm/i915/breadcrumbs: Assert that we do not shortcut the current bottom-half
We need to ensure that we always serialize updates to the bottom-half
using the breadcrumbs.irq_lock so that we don't race with a concurrent
interrupt handler. This is most important just prior to leaving the
waiter (when the intel_wait will be overwritten), so make sure we are
not the current bottom-half when skipping the irq locks.
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: http://patchwork.freedesktop.org/patch/msgid/20170315210726.12095-4-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/intel_breadcrumbs.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_breadcrumbs.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c index e2dbd919d82f..cb6985acc542 100644 --- a/drivers/gpu/drm/i915/intel_breadcrumbs.c +++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c @@ -287,6 +287,7 @@ static inline void __intel_breadcrumbs_finish(struct intel_breadcrumbs *b, struct intel_wait *wait) { lockdep_assert_held(&b->rb_lock); + GEM_BUG_ON(b->irq_wait == wait); /* This request is completed, so remove it from the tree, mark it as * complete, and *then* wake up the associated task. @@ -512,8 +513,10 @@ void intel_engine_remove_wait(struct intel_engine_cs *engine, * the tree by the bottom-half to avoid contention on the spinlock * by the herd. */ - if (RB_EMPTY_NODE(&wait->node)) + if (RB_EMPTY_NODE(&wait->node)) { + GEM_BUG_ON(READ_ONCE(b->irq_wait) == wait); return; + } spin_lock_irq(&b->rb_lock); __intel_engine_remove_wait(engine, wait); |