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Pretty soon only some drivers will need dev->struct_mutex in their gem_free_object callbacks. Hence it's really important to make sure everything still keeps getting this right. v2: Don't check for locking before we check for non-NULL obj. Spotted by Dan Carpenter. Link: http://mid.gmane.org/1444894601-5200-10-git-send-email-daniel.vetter@ffwll.ch Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
189 lines
6.0 KiB
C
189 lines
6.0 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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WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
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kref_put(&obj->refcount, drm_gem_object_free);
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}
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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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