drivers/staging/gma500/gem_glue.c

   1 /**************************************************************************
   2  * Copyright (c) 2011, Intel Corporation.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  **************************************************************************/
  19
  20 #include <drm/drmP.h>
  21 #include <drm/drm.h>
  22
  23 /**
  24  * Initialize an already allocated GEM object of the specified size with
  25  * no GEM provided backing store. Instead the caller is responsible for
  26  * backing the object and handling it.
  27  */
  28 int drm_gem_private_object_init(struct drm_device *dev,
  29                         struct drm_gem_object *obj, size_t size)
  30 {
  31         BUG_ON((size & (PAGE_SIZE - 1)) != 0);
  32
  33         obj->dev = dev;
  34         obj->filp = NULL;
  35
  36         kref_init(&obj->refcount);
  37         atomic_set(&obj->handle_count, 0);
  38         obj->size = size;
  39
  40         return 0;
  41 }
  42
  43 void drm_gem_object_release_wrap(struct drm_gem_object *obj)
  44 {
  45         /* Remove the list map if one is present */
  46         if (obj->map_list.map) {
  47                 struct drm_gem_mm *mm = obj->dev->mm_private;
  48                 struct drm_map_list *list = &obj->map_list;
  49                 drm_ht_remove_item(&mm->offset_hash, &list->hash);
  50                 drm_mm_put_block(list->file_offset_node);
  51                 kfree(list->map);
  52                 list->map = NULL;
  53         }
  54         if (obj->filp)
  55                 drm_gem_object_release(obj);
  56 }
  57
  58 /**
  59  *      gem_create_mmap_offset          -       invent an mmap offset
  60  *      @obj: our object
  61  *
  62  *      Standard implementation of offset generation for mmap as is
  63  *      duplicated in several drivers. This belongs in GEM.
  64  */
  65 int gem_create_mmap_offset(struct drm_gem_object *obj)
  66 {
  67         struct drm_device *dev = obj->dev;
  68         struct drm_gem_mm *mm = dev->mm_private;
  69         struct drm_map_list *list;
  70         struct drm_local_map *map;
  71         int ret;
  72
  73         list = &obj->map_list;
  74         list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
  75         if (list->map == NULL)
  76                 return -ENOMEM;
  77         map = list->map;
  78         map->type = _DRM_GEM;
  79         map->size = obj->size;
  80         map->handle = obj;
  81
  82         list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
  83                                         obj->size / PAGE_SIZE, 0, 0);
  84         if (!list->file_offset_node) {
  85                 dev_err(dev->dev, "failed to allocate offset for bo %d\n",
  86                                                                 obj->name);
  87                 ret = -ENOSPC;
  88                 goto free_it;
  89         }
  90         list->file_offset_node = drm_mm_get_block(list->file_offset_node,
  91                                         obj->size / PAGE_SIZE, 0);
  92         if (!list->file_offset_node) {
  93                 ret = -ENOMEM;
  94                 goto free_it;
  95         }
  96         list->hash.key = list->file_offset_node->start;
  97         ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
  98         if (ret) {
  99                 dev_err(dev->dev, "failed to add to map hash\n");
 100                 goto free_mm;
 101         }
 102         return 0;
 103
 104 free_mm:
 105         drm_mm_put_block(list->file_offset_node);
 106 free_it:
 107         kfree(list->map);
 108         list->map = NULL;
 109         return ret;
 110 }