diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_frontbuffer.h')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_frontbuffer.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.h b/drivers/gpu/drm/i915/display/intel_frontbuffer.h new file mode 100644 index 000000000..6d41f5394 --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.h @@ -0,0 +1,152 @@ +/* + * Copyright (c) 2014-2016 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#ifndef __INTEL_FRONTBUFFER_H__ +#define __INTEL_FRONTBUFFER_H__ + +#include <linux/atomic.h> +#include <linux/kref.h> + +#include "gem/i915_gem_object_types.h" +#include "i915_active.h" + +struct drm_i915_private; + +enum fb_op_origin { + ORIGIN_GTT, + ORIGIN_CPU, + ORIGIN_CS, + ORIGIN_FLIP, + ORIGIN_DIRTYFB, +}; + +struct intel_frontbuffer { + struct kref ref; + atomic_t bits; + struct i915_active write; + struct drm_i915_gem_object *obj; + struct rcu_head rcu; +}; + +void intel_frontbuffer_flip_prepare(struct drm_i915_private *i915, + unsigned frontbuffer_bits); +void intel_frontbuffer_flip_complete(struct drm_i915_private *i915, + unsigned frontbuffer_bits); +void intel_frontbuffer_flip(struct drm_i915_private *i915, + unsigned frontbuffer_bits); + +void intel_frontbuffer_put(struct intel_frontbuffer *front); + +static inline struct intel_frontbuffer * +__intel_frontbuffer_get(const struct drm_i915_gem_object *obj) +{ + struct intel_frontbuffer *front; + + if (likely(!rcu_access_pointer(obj->frontbuffer))) + return NULL; + + rcu_read_lock(); + do { + front = rcu_dereference(obj->frontbuffer); + if (!front) + break; + + if (unlikely(!kref_get_unless_zero(&front->ref))) + continue; + + if (likely(front == rcu_access_pointer(obj->frontbuffer))) + break; + + intel_frontbuffer_put(front); + } while (1); + rcu_read_unlock(); + + return front; +} + +struct intel_frontbuffer * +intel_frontbuffer_get(struct drm_i915_gem_object *obj); + +void __intel_fb_invalidate(struct intel_frontbuffer *front, + enum fb_op_origin origin, + unsigned int frontbuffer_bits); + +/** + * intel_frontbuffer_invalidate - invalidate frontbuffer object + * @front: GEM object to invalidate + * @origin: which operation caused the invalidation + * + * This function gets called every time rendering on the given object starts and + * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must + * be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed + * until the rendering completes or a flip on this frontbuffer plane is + * scheduled. + */ +static inline bool intel_frontbuffer_invalidate(struct intel_frontbuffer *front, + enum fb_op_origin origin) +{ + unsigned int frontbuffer_bits; + + if (!front) + return false; + + frontbuffer_bits = atomic_read(&front->bits); + if (!frontbuffer_bits) + return false; + + __intel_fb_invalidate(front, origin, frontbuffer_bits); + return true; +} + +void __intel_fb_flush(struct intel_frontbuffer *front, + enum fb_op_origin origin, + unsigned int frontbuffer_bits); + +/** + * intel_frontbuffer_flush - flush frontbuffer object + * @front: GEM object to flush + * @origin: which operation caused the flush + * + * This function gets called every time rendering on the given object has + * completed and frontbuffer caching can be started again. + */ +static inline void intel_frontbuffer_flush(struct intel_frontbuffer *front, + enum fb_op_origin origin) +{ + unsigned int frontbuffer_bits; + + if (!front) + return; + + frontbuffer_bits = atomic_read(&front->bits); + if (!frontbuffer_bits) + return; + + __intel_fb_flush(front, origin, frontbuffer_bits); +} + +void intel_frontbuffer_track(struct intel_frontbuffer *old, + struct intel_frontbuffer *new, + unsigned int frontbuffer_bits); + +#endif /* __INTEL_FRONTBUFFER_H__ */ |