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0578be680c
If kref_put_mutex returns true then the caller or the put function is responsible for unlocking the mutex. The usual pattern assumes that the free callback unlocks the mutex, but since that is shared with the locked variant we need to explicitly unlock here. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
186 lines
5.9 KiB
C
186 lines
5.9 KiB
C
#ifndef __DRM_GEM_H__
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#define __DRM_GEM_H__
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/*
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* GEM Graphics Execution Manager Driver Interfaces
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* Copyright (c) 2009-2010, Code Aurora Forum.
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* All rights reserved.
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* Copyright © 2014 Intel Corporation
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* Daniel Vetter <daniel.vetter@ffwll.ch>
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*
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* Author: Rickard E. (Rik) Faith <faith@valinux.com>
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* Author: Gareth Hughes <gareth@valinux.com>
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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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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* This structure defines the drm_mm memory object, which will be used by the
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* DRM for its buffer objects.
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*/
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struct drm_gem_object {
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/** Reference count of this object */
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struct kref refcount;
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/**
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* handle_count - gem file_priv handle count of this object
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*
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* Each handle also holds a reference. Note that when the handle_count
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* drops to 0 any global names (e.g. the id in the flink namespace) will
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* be cleared.
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*
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* Protected by dev->object_name_lock.
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* */
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unsigned handle_count;
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/** Related drm device */
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struct drm_device *dev;
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/** File representing the shmem storage */
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struct file *filp;
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/* Mapping info for this object */
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struct drm_vma_offset_node vma_node;
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/**
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* Size of the object, in bytes. Immutable over the object's
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* lifetime.
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*/
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size_t size;
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/**
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* Global name for this object, starts at 1. 0 means unnamed.
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* Access is covered by the object_name_lock in the related drm_device
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*/
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int name;
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/**
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* Memory domains. These monitor which caches contain read/write data
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* related to the object. When transitioning from one set of domains
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* to another, the driver is called to ensure that caches are suitably
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* flushed and invalidated
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*/
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uint32_t read_domains;
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uint32_t write_domain;
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/**
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* While validating an exec operation, the
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* new read/write domain values are computed here.
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* They will be transferred to the above values
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* at the point that any cache flushing occurs
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*/
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uint32_t pending_read_domains;
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uint32_t pending_write_domain;
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/**
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* dma_buf - dma buf associated with this GEM object
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*
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* Pointer to the dma-buf associated with this gem object (either
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* through importing or exporting). We break the resulting reference
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* loop when the last gem handle for this object is released.
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*
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* Protected by obj->object_name_lock
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*/
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struct dma_buf *dma_buf;
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/**
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* import_attach - dma buf attachment backing this object
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*
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* Any foreign dma_buf imported as a gem object has this set to the
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* attachment point for the device. This is invariant over the lifetime
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* of a gem object.
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*
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* The driver's ->gem_free_object callback is responsible for cleaning
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* up the dma_buf attachment and references acquired at import time.
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*
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* Note that the drm gem/prime core does not depend upon drivers setting
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* this field any more. So for drivers where this doesn't make sense
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* (e.g. virtual devices or a displaylink behind an usb bus) they can
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* simply leave it as NULL.
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*/
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struct dma_buf_attachment *import_attach;
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};
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void drm_gem_object_release(struct drm_gem_object *obj);
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void drm_gem_object_free(struct kref *kref);
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int drm_gem_object_init(struct drm_device *dev,
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struct drm_gem_object *obj, size_t size);
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void drm_gem_private_object_init(struct drm_device *dev,
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struct drm_gem_object *obj, size_t size);
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void drm_gem_vm_open(struct vm_area_struct *vma);
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void drm_gem_vm_close(struct vm_area_struct *vma);
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int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
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struct vm_area_struct *vma);
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int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
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static inline void
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drm_gem_object_reference(struct drm_gem_object *obj)
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{
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kref_get(&obj->refcount);
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}
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static inline void
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drm_gem_object_unreference(struct drm_gem_object *obj)
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{
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if (obj != NULL)
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kref_put(&obj->refcount, drm_gem_object_free);
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}
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static inline void
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drm_gem_object_unreference_unlocked(struct drm_gem_object *obj)
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{
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struct drm_device *dev;
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if (!obj)
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return;
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dev = obj->dev;
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if (kref_put_mutex(&obj->refcount, drm_gem_object_free, &dev->struct_mutex))
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mutex_unlock(&dev->struct_mutex);
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else
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might_lock(&dev->struct_mutex);
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}
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int drm_gem_handle_create(struct drm_file *file_priv,
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struct drm_gem_object *obj,
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u32 *handlep);
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int drm_gem_handle_delete(struct drm_file *filp, u32 handle);
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void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
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int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
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int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
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struct page **drm_gem_get_pages(struct drm_gem_object *obj);
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void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
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bool dirty, bool accessed);
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struct drm_gem_object *drm_gem_object_lookup(struct drm_device *dev,
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struct drm_file *filp,
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u32 handle);
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int drm_gem_dumb_destroy(struct drm_file *file,
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struct drm_device *dev,
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uint32_t handle);
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#endif /* __DRM_GEM_H__ */
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