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da42104f58
Since obj->frontbuffer is no longer protected by the struct_mutex, as we
are processing the execbuf, it may be removed. Mark the
intel_frontbuffer as rcu protected, and so acquire a reference to
the struct as we track activity upon it.
Closes: https://gitlab.freedesktop.org/drm/intel/issues/827
Fixes: 8e7cb1799b ("drm/i915: Extract intel_frontbuffer active tracking")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: <stable@vger.kernel.org> # v5.4+
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191218104043.3539458-1-chris@chris-wilson.co.uk
153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/*
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* Copyright (c) 2014-2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef __INTEL_FRONTBUFFER_H__
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#define __INTEL_FRONTBUFFER_H__
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#include <linux/atomic.h>
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#include <linux/kref.h>
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#include "gem/i915_gem_object_types.h"
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#include "i915_active.h"
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struct drm_i915_private;
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enum fb_op_origin {
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ORIGIN_GTT,
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ORIGIN_CPU,
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ORIGIN_CS,
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ORIGIN_FLIP,
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ORIGIN_DIRTYFB,
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};
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struct intel_frontbuffer {
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struct kref ref;
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atomic_t bits;
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struct i915_active write;
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struct drm_i915_gem_object *obj;
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struct rcu_head rcu;
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};
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void intel_frontbuffer_flip_prepare(struct drm_i915_private *i915,
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unsigned frontbuffer_bits);
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void intel_frontbuffer_flip_complete(struct drm_i915_private *i915,
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unsigned frontbuffer_bits);
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void intel_frontbuffer_flip(struct drm_i915_private *i915,
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unsigned frontbuffer_bits);
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void intel_frontbuffer_put(struct intel_frontbuffer *front);
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static inline struct intel_frontbuffer *
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__intel_frontbuffer_get(const struct drm_i915_gem_object *obj)
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{
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struct intel_frontbuffer *front;
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if (likely(!rcu_access_pointer(obj->frontbuffer)))
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return NULL;
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rcu_read_lock();
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do {
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front = rcu_dereference(obj->frontbuffer);
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if (!front)
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break;
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if (unlikely(!kref_get_unless_zero(&front->ref)))
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continue;
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if (likely(front == rcu_access_pointer(obj->frontbuffer)))
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break;
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intel_frontbuffer_put(front);
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} while (1);
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rcu_read_unlock();
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return front;
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}
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struct intel_frontbuffer *
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intel_frontbuffer_get(struct drm_i915_gem_object *obj);
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void __intel_fb_invalidate(struct intel_frontbuffer *front,
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enum fb_op_origin origin,
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unsigned int frontbuffer_bits);
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/**
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* intel_frontbuffer_invalidate - invalidate frontbuffer object
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* @front: GEM object to invalidate
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* @origin: which operation caused the invalidation
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*
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* This function gets called every time rendering on the given object starts and
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* frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must
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* be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed
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* until the rendering completes or a flip on this frontbuffer plane is
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* scheduled.
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*/
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static inline bool intel_frontbuffer_invalidate(struct intel_frontbuffer *front,
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enum fb_op_origin origin)
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{
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unsigned int frontbuffer_bits;
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if (!front)
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return false;
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frontbuffer_bits = atomic_read(&front->bits);
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if (!frontbuffer_bits)
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return false;
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__intel_fb_invalidate(front, origin, frontbuffer_bits);
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return true;
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}
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void __intel_fb_flush(struct intel_frontbuffer *front,
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enum fb_op_origin origin,
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unsigned int frontbuffer_bits);
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/**
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* intel_frontbuffer_flush - flush frontbuffer object
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* @front: GEM object to flush
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* @origin: which operation caused the flush
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*
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* This function gets called every time rendering on the given object has
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* completed and frontbuffer caching can be started again.
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*/
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static inline void intel_frontbuffer_flush(struct intel_frontbuffer *front,
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enum fb_op_origin origin)
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{
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unsigned int frontbuffer_bits;
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if (!front)
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return;
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frontbuffer_bits = atomic_read(&front->bits);
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if (!frontbuffer_bits)
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return;
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__intel_fb_flush(front, origin, frontbuffer_bits);
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}
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void intel_frontbuffer_track(struct intel_frontbuffer *old,
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struct intel_frontbuffer *new,
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unsigned int frontbuffer_bits);
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#endif /* __INTEL_FRONTBUFFER_H__ */
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