release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/gpu/drm/drm_drawable.c

   1 /**
   2  * \file drm_drawable.c
   3  * IOCTLs for drawables
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  * \author Michel Dänzer <michel@tungstengraphics.com>
   8  */
   9
  10 /*
  11  * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com
  12  *
  13  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  14  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  15  * Copyright 2006 Tungsten Graphics, Inc., Bismarck, North Dakota.
  16  * All Rights Reserved.
  17  *
  18  * Permission is hereby granted, free of charge, to any person obtaining a
  19  * copy of this software and associated documentation files (the "Software"),
  20  * to deal in the Software without restriction, including without limitation
  21  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  22  * and/or sell copies of the Software, and to permit persons to whom the
  23  * Software is furnished to do so, subject to the following conditions:
  24  *
  25  * The above copyright notice and this permission notice (including the next
  26  * paragraph) shall be included in all copies or substantial portions of the
  27  * Software.
  28  *
  29  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  30  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  31  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  32  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  33  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  34  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  35  * OTHER DEALINGS IN THE SOFTWARE.
  36  */
  37
  38 #include "drmP.h"
  39
  40 /**
  41  * Allocate drawable ID and memory to store information about it.
  42  */
  43 int drm_adddraw(struct drm_device *dev, void *data, struct drm_file *file_priv)
  44 {
  45         unsigned long irqflags;
  46         struct drm_draw *draw = data;
  47         int new_id = 0;
  48         int ret;
  49
  50 again:
  51         if (idr_pre_get(&dev->drw_idr, GFP_KERNEL) == 0) {
  52                 DRM_ERROR("Out of memory expanding drawable idr\n");
  53                 return -ENOMEM;
  54         }
  55
  56         spin_lock_irqsave(&dev->drw_lock, irqflags);
  57         ret = idr_get_new_above(&dev->drw_idr, NULL, 1, &new_id);
  58         if (ret == -EAGAIN) {
  59                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  60                 goto again;
  61         }
  62
  63         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  64
  65         draw->handle = new_id;
  66
  67         DRM_DEBUG("%d\n", draw->handle);
  68
  69         return 0;
  70 }
  71
  72 /**
  73  * Free drawable ID and memory to store information about it.
  74  */
  75 int drm_rmdraw(struct drm_device *dev, void *data, struct drm_file *file_priv)
  76 {
  77         struct drm_draw *draw = data;
  78         unsigned long irqflags;
  79         struct drm_drawable_info *info;
  80
  81         spin_lock_irqsave(&dev->drw_lock, irqflags);
  82
  83         info = drm_get_drawable_info(dev, draw->handle);
  84         if (info == NULL) {
  85                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  86                 return -EINVAL;
  87         }
  88         kfree(info->rects);
  89         kfree(info);
  90
  91         idr_remove(&dev->drw_idr, draw->handle);
  92
  93         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  94         DRM_DEBUG("%d\n", draw->handle);
  95         return 0;
  96 }
  97
  98 int drm_update_drawable_info(struct drm_device *dev, void *data, struct drm_file *file_priv)
  99 {
 100         struct drm_update_draw *update = data;
 101         unsigned long irqflags;
 102         struct drm_clip_rect *rects;
 103         struct drm_drawable_info *info;
 104         int err;
 105
 106         info = idr_find(&dev->drw_idr, update->handle);
 107         if (!info) {
 108                 info = kzalloc(sizeof(*info), GFP_KERNEL);
 109                 if (!info)
 110                         return -ENOMEM;
 111                 if (IS_ERR(idr_replace(&dev->drw_idr, info, update->handle))) {
 112                         DRM_ERROR("No such drawable %d\n", update->handle);
 113                         kfree(info);
 114                         return -EINVAL;
 115                 }
 116         }
 117
 118         switch (update->type) {
 119         case DRM_DRAWABLE_CLIPRECTS:
 120                 if (update->num == 0)
 121                         rects = NULL;
 122                 else if (update->num != info->num_rects) {
 123                         rects = kmalloc(update->num *
 124                                         sizeof(struct drm_clip_rect),
 125                                         GFP_KERNEL);
 126                 } else
 127                         rects = info->rects;
 128
 129                 if (update->num && !rects) {
 130                         DRM_ERROR("Failed to allocate cliprect memory\n");
 131                         err = -ENOMEM;
 132                         goto error;
 133                 }
 134
 135                 if (update->num && DRM_COPY_FROM_USER(rects,
 136                                                      (struct drm_clip_rect __user *)
 137                                                      (unsigned long)update->data,
 138                                                      update->num *
 139                                                      sizeof(*rects))) {
 140                         DRM_ERROR("Failed to copy cliprects from userspace\n");
 141                         err = -EFAULT;
 142                         goto error;
 143                 }
 144
 145                 spin_lock_irqsave(&dev->drw_lock, irqflags);
 146
 147                 if (rects != info->rects) {
 148                         kfree(info->rects);
 149                 }
 150
 151                 info->rects = rects;
 152                 info->num_rects = update->num;
 153
 154                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 155
 156                 DRM_DEBUG("Updated %d cliprects for drawable %d\n",
 157                           info->num_rects, update->handle);
 158                 break;
 159         default:
 160                 DRM_ERROR("Invalid update type %d\n", update->type);
 161                 return -EINVAL;
 162         }
 163
 164         return 0;
 165
 166 error:
 167         if (rects != info->rects)
 168                 kfree(rects);
 169
 170         return err;
 171 }
 172
 173 /**
 174  * Caller must hold the drawable spinlock!
 175  */
 176 struct drm_drawable_info *drm_get_drawable_info(struct drm_device *dev, drm_drawable_t id)
 177 {
 178         return idr_find(&dev->drw_idr, id);
 179 }
 180 EXPORT_SYMBOL(drm_get_drawable_info);
 181
 182 static int drm_drawable_free(int idr, void *p, void *data)
 183 {
 184         struct drm_drawable_info *info = p;
 185
 186         if (info) {
 187                 kfree(info->rects);
 188                 kfree(info);
 189         }
 190
 191         return 0;
 192 }
 193
 194 void drm_drawable_free_all(struct drm_device *dev)
 195 {
 196         idr_for_each(&dev->drw_idr, drm_drawable_free, NULL);
 197         idr_remove_all(&dev->drw_idr);
 198 }