diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_active.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_active.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_active.c b/drivers/gpu/drm/i915/i915_active.c index 13f304a29fc8..22341c62c204 100644 --- a/drivers/gpu/drm/i915/i915_active.c +++ b/drivers/gpu/drm/i915/i915_active.c @@ -196,6 +196,7 @@ void __i915_active_init(struct drm_i915_private *i915, debug_active_init(ref); ref->i915 = i915; + ref->flags = 0; ref->active = active; ref->retire = retire; ref->tree = RB_ROOT; @@ -262,6 +263,34 @@ void i915_active_release(struct i915_active *ref) active_retire(ref); } +static void __active_ungrab(struct i915_active *ref) +{ + clear_and_wake_up_bit(I915_ACTIVE_GRAB_BIT, &ref->flags); +} + +bool i915_active_trygrab(struct i915_active *ref) +{ + debug_active_assert(ref); + + if (test_and_set_bit(I915_ACTIVE_GRAB_BIT, &ref->flags)) + return false; + + if (!atomic_add_unless(&ref->count, 1, 0)) { + __active_ungrab(ref); + return false; + } + + return true; +} + +void i915_active_ungrab(struct i915_active *ref) +{ + GEM_BUG_ON(!test_bit(I915_ACTIVE_GRAB_BIT, &ref->flags)); + + active_retire(ref); + __active_ungrab(ref); +} + int i915_active_wait(struct i915_active *ref) { struct active_node *it, *n; @@ -270,7 +299,7 @@ int i915_active_wait(struct i915_active *ref) might_sleep(); might_lock(&ref->mutex); - if (RB_EMPTY_ROOT(&ref->tree)) + if (i915_active_is_idle(ref)) return 0; err = mutex_lock_interruptible(&ref->mutex); @@ -292,6 +321,9 @@ int i915_active_wait(struct i915_active *ref) if (err) return err; + if (wait_on_bit(&ref->flags, I915_ACTIVE_GRAB_BIT, TASK_KILLABLE)) + return -EINTR; + if (!i915_active_is_idle(ref)) return -EBUSY; |