Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 170 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..3c474ed93
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.h
@@ -0,0 +1,170 @@
+/*
+ * 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/bits.h>
+#include <linux/kref.h>
+
+#include "gem/i915_gem_object_types.h"
+#include "i915_active_types.h"
+
+struct drm_i915_private;
+
+enum fb_op_origin {
+	ORIGIN_CPU = 0,
+	ORIGIN_CS,
+	ORIGIN_FLIP,
+	ORIGIN_DIRTYFB,
+	ORIGIN_CURSOR_UPDATE,
+};
+
+struct intel_frontbuffer {
+	struct kref ref;
+	atomic_t bits;
+	struct i915_active write;
+	struct drm_i915_gem_object *obj;
+	struct rcu_head rcu;
+};
+
+/*
+ * Frontbuffer tracking bits. Set in obj->frontbuffer_bits while a gem bo is
+ * considered to be the frontbuffer for the given plane interface-wise. This
+ * doesn't mean that the hw necessarily already scans it out, but that any
+ * rendering (by the cpu or gpu) will land in the frontbuffer eventually.
+ *
+ * We have one bit per pipe and per scanout plane type.
+ */
+#define INTEL_FRONTBUFFER_BITS_PER_PIPE 8
+#define INTEL_FRONTBUFFER(pipe, plane_id) \
+	BIT((plane_id) + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe));
+#define INTEL_FRONTBUFFER_OVERLAY(pipe) \
+	BIT(INTEL_FRONTBUFFER_BITS_PER_PIPE - 1 + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))
+#define INTEL_FRONTBUFFER_ALL_MASK(pipe) \
+	GENMASK(INTEL_FRONTBUFFER_BITS_PER_PIPE * ((pipe) + 1) - 1,	\
+		INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))
+
+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__ */