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  1. #ifndef __DRM_GEM_H__
  2. #define __DRM_GEM_H__
  3.  
  4. /*
  5.  * GEM Graphics Execution Manager Driver Interfaces
  6.  *
  7.  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  8.  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  9.  * Copyright (c) 2009-2010, Code Aurora Forum.
  10.  * All rights reserved.
  11.  * Copyright © 2014 Intel Corporation
  12.  *   Daniel Vetter <daniel.vetter@ffwll.ch>
  13.  *
  14.  * Author: Rickard E. (Rik) Faith <faith@valinux.com>
  15.  * Author: Gareth Hughes <gareth@valinux.com>
  16.  *
  17.  * Permission is hereby granted, free of charge, to any person obtaining a
  18.  * copy of this software and associated documentation files (the "Software"),
  19.  * to deal in the Software without restriction, including without limitation
  20.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  21.  * and/or sell copies of the Software, and to permit persons to whom the
  22.  * Software is furnished to do so, subject to the following conditions:
  23.  *
  24.  * The above copyright notice and this permission notice (including the next
  25.  * paragraph) shall be included in all copies or substantial portions of the
  26.  * Software.
  27.  *
  28.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  29.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  30.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  31.  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  32.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  33.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  34.  * OTHER DEALINGS IN THE SOFTWARE.
  35.  */
  36.  
  37. /**
  38.  * This structure defines the drm_mm memory object, which will be used by the
  39.  * DRM for its buffer objects.
  40.  */
  41. struct drm_gem_object {
  42.         /** Reference count of this object */
  43.         struct kref refcount;
  44.  
  45.         /**
  46.          * handle_count - gem file_priv handle count of this object
  47.          *
  48.          * Each handle also holds a reference. Note that when the handle_count
  49.          * drops to 0 any global names (e.g. the id in the flink namespace) will
  50.          * be cleared.
  51.          *
  52.          * Protected by dev->object_name_lock.
  53.          * */
  54.         unsigned handle_count;
  55.  
  56.         /** Related drm device */
  57.         struct drm_device *dev;
  58.  
  59.         /** File representing the shmem storage */
  60.         struct file *filp;
  61.  
  62.         /* Mapping info for this object */
  63.         struct drm_vma_offset_node vma_node;
  64.  
  65.         /**
  66.          * Size of the object, in bytes.  Immutable over the object's
  67.          * lifetime.
  68.          */
  69.         size_t size;
  70.  
  71.         /**
  72.          * Global name for this object, starts at 1. 0 means unnamed.
  73.          * Access is covered by the object_name_lock in the related drm_device
  74.          */
  75.         int name;
  76.  
  77.         /**
  78.          * Memory domains. These monitor which caches contain read/write data
  79.          * related to the object. When transitioning from one set of domains
  80.          * to another, the driver is called to ensure that caches are suitably
  81.          * flushed and invalidated
  82.          */
  83.         uint32_t read_domains;
  84.         uint32_t write_domain;
  85.  
  86.         /**
  87.          * While validating an exec operation, the
  88.          * new read/write domain values are computed here.
  89.          * They will be transferred to the above values
  90.          * at the point that any cache flushing occurs
  91.          */
  92.         uint32_t pending_read_domains;
  93.         uint32_t pending_write_domain;
  94.  
  95.         /**
  96.          * dma_buf - dma buf associated with this GEM object
  97.          *
  98.          * Pointer to the dma-buf associated with this gem object (either
  99.          * through importing or exporting). We break the resulting reference
  100.          * loop when the last gem handle for this object is released.
  101.          *
  102.          * Protected by obj->object_name_lock
  103.          */
  104.         struct dma_buf *dma_buf;
  105.  
  106.         /**
  107.          * import_attach - dma buf attachment backing this object
  108.          *
  109.          * Any foreign dma_buf imported as a gem object has this set to the
  110.          * attachment point for the device. This is invariant over the lifetime
  111.          * of a gem object.
  112.          *
  113.          * The driver's ->gem_free_object callback is responsible for cleaning
  114.          * up the dma_buf attachment and references acquired at import time.
  115.          *
  116.          * Note that the drm gem/prime core does not depend upon drivers setting
  117.          * this field any more. So for drivers where this doesn't make sense
  118.          * (e.g. virtual devices or a displaylink behind an usb bus) they can
  119.          * simply leave it as NULL.
  120.          */
  121.         struct dma_buf_attachment *import_attach;
  122. };
  123.  
  124. void drm_gem_object_release(struct drm_gem_object *obj);
  125. void drm_gem_object_free(struct kref *kref);
  126. int drm_gem_object_init(struct drm_device *dev,
  127.                         struct drm_gem_object *obj, size_t size);
  128. void drm_gem_private_object_init(struct drm_device *dev,
  129.                                  struct drm_gem_object *obj, size_t size);
  130. void drm_gem_vm_open(struct vm_area_struct *vma);
  131. void drm_gem_vm_close(struct vm_area_struct *vma);
  132. int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
  133.                      struct vm_area_struct *vma);
  134. int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
  135.  
  136. static inline void
  137. drm_gem_object_reference(struct drm_gem_object *obj)
  138. {
  139.         kref_get(&obj->refcount);
  140. }
  141.  
  142. static inline void
  143. drm_gem_object_unreference(struct drm_gem_object *obj)
  144. {
  145.         if (obj != NULL) {
  146.                 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
  147.  
  148.                 kref_put(&obj->refcount, drm_gem_object_free);
  149.         }
  150. }
  151.  
  152. static inline void
  153. drm_gem_object_unreference_unlocked(struct drm_gem_object *obj)
  154. {
  155.         struct drm_device *dev;
  156.  
  157.         if (!obj)
  158.                 return;
  159.  
  160.         dev = obj->dev;
  161.         if (kref_put_mutex(&obj->refcount, drm_gem_object_free, &dev->struct_mutex))
  162.                 mutex_unlock(&dev->struct_mutex);
  163.         else
  164.                 might_lock(&dev->struct_mutex);
  165. }
  166.  
  167. int drm_gem_handle_create(struct drm_file *file_priv,
  168.                           struct drm_gem_object *obj,
  169.                           u32 *handlep);
  170. int drm_gem_handle_delete(struct drm_file *filp, u32 handle);
  171.  
  172.  
  173. void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
  174. int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
  175. int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
  176.  
  177. struct page **drm_gem_get_pages(struct drm_gem_object *obj);
  178. void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
  179.                 bool dirty, bool accessed);
  180.  
  181. struct drm_gem_object *drm_gem_object_lookup(struct drm_device *dev,
  182.                                              struct drm_file *filp,
  183.                                              u32 handle);
  184. int drm_gem_dumb_destroy(struct drm_file *file,
  185.                          struct drm_device *dev,
  186.                          uint32_t handle);
  187.  
  188. #endif /* __DRM_GEM_H__ */
  189.