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 void drm_gem_object_release_wrap(struct drm_gem_object *obj)
  24 {
  25         /* Remove the list map if one is present */
  26         if (obj->map_list.map) {
  27                 struct drm_gem_mm *mm = obj->dev->mm_private;
  28                 struct drm_map_list *list = &obj->map_list;
  29                 drm_ht_remove_item(&mm->offset_hash, &list->hash);
  30                 drm_mm_put_block(list->file_offset_node);
  31                 kfree(list->map);
  32                 list->map = NULL;
  33         }
  34         drm_gem_object_release(obj);
  35 }
  36
  37 /**
  38  *      gem_create_mmap_offset          -       invent an mmap offset
  39  *      @obj: our object
  40  *
  41  *      Standard implementation of offset generation for mmap as is
  42  *      duplicated in several drivers. This belongs in GEM.
  43  */
  44 int gem_create_mmap_offset(struct drm_gem_object *obj)
  45 {
  46         struct drm_device *dev = obj->dev;
  47         struct drm_gem_mm *mm = dev->mm_private;
  48         struct drm_map_list *list;
  49         struct drm_local_map *map;
  50         int ret;
  51
  52         list = &obj->map_list;
  53         list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
  54         if (list->map == NULL)
  55                 return -ENOMEM;
  56         map = list->map;
  57         map->type = _DRM_GEM;
  58         map->size = obj->size;
  59         map->handle = obj;
  60
  61         list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
  62                                         obj->size / PAGE_SIZE, 0, 0);
  63         if (!list->file_offset_node) {
  64                 dev_err(dev->dev, "failed to allocate offset for bo %d\n",
  65                                                                 obj->name);
  66                 ret = -ENOSPC;
  67                 goto free_it;
  68         }
  69         list->file_offset_node = drm_mm_get_block(list->file_offset_node,
  70                                         obj->size / PAGE_SIZE, 0);
  71         if (!list->file_offset_node) {
  72                 ret = -ENOMEM;
  73                 goto free_it;
  74         }
  75         list->hash.key = list->file_offset_node->start;
  76         ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
  77         if (ret) {
  78                 dev_err(dev->dev, "failed to add to map hash\n");
  79                 goto free_mm;
  80         }
  81         return 0;
  82
  83 free_mm:
  84         drm_mm_put_block(list->file_offset_node);
  85 free_it:
  86         kfree(list->map);
  87         list->map = NULL;
  88         return ret;
  89 }