drivers/char/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
  80         spin_lock_irqsave(&dev->drw_lock, irqflags);
  81
  82         drm_free(drm_get_drawable_info(dev, draw->handle),
  83                  sizeof(struct drm_drawable_info), DRM_MEM_BUFS);
  84
  85         idr_remove(&dev->drw_idr, draw->handle);
  86
  87         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  88         DRM_DEBUG("%d\n", draw->handle);
  89         return 0;
  90 }
  91
  92 int drm_update_drawable_info(struct drm_device *dev, void *data, struct drm_file *file_priv)
  93 {
  94         struct drm_update_draw *update = data;
  95         unsigned long irqflags;
  96         struct drm_clip_rect *rects;
  97         struct drm_drawable_info *info;
  98         int err;
  99
 100         info = idr_find(&dev->drw_idr, update->handle);
 101         if (!info) {
 102                 info = drm_calloc(1, sizeof(*info), DRM_MEM_BUFS);
 103                 if (!info)
 104                         return -ENOMEM;
 105                 if (IS_ERR(idr_replace(&dev->drw_idr, info, update->handle))) {
 106                         DRM_ERROR("No such drawable %d\n", update->handle);
 107                         drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 108                         return -EINVAL;
 109                 }
 110         }
 111
 112         switch (update->type) {
 113         case DRM_DRAWABLE_CLIPRECTS:
 114                 if (update->num != info->num_rects) {
 115                         rects = drm_alloc(update->num * sizeof(struct drm_clip_rect),
 116                                          DRM_MEM_BUFS);
 117                 } else
 118                         rects = info->rects;
 119
 120                 if (update->num && !rects) {
 121                         DRM_ERROR("Failed to allocate cliprect memory\n");
 122                         err = -ENOMEM;
 123                         goto error;
 124                 }
 125
 126                 if (update->num && DRM_COPY_FROM_USER(rects,
 127                                                      (struct drm_clip_rect __user *)
 128                                                      (unsigned long)update->data,
 129                                                      update->num *
 130                                                      sizeof(*rects))) {
 131                         DRM_ERROR("Failed to copy cliprects from userspace\n");
 132                         err = -EFAULT;
 133                         goto error;
 134                 }
 135
 136                 spin_lock_irqsave(&dev->drw_lock, irqflags);
 137
 138                 if (rects != info->rects) {
 139                         drm_free(info->rects, info->num_rects *
 140                                  sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 141                 }
 142
 143                 info->rects = rects;
 144                 info->num_rects = update->num;
 145
 146                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 147
 148                 DRM_DEBUG("Updated %d cliprects for drawable %d\n",
 149                           info->num_rects, update->handle);
 150                 break;
 151         default:
 152                 DRM_ERROR("Invalid update type %d\n", update->type);
 153                 return -EINVAL;
 154         }
 155
 156         return 0;
 157
 158 error:
 159         if (rects != info->rects)
 160                 drm_free(rects, update->num * sizeof(struct drm_clip_rect),
 161                          DRM_MEM_BUFS);
 162
 163         return err;
 164 }
 165
 166 /**
 167  * Caller must hold the drawable spinlock!
 168  */
 169 struct drm_drawable_info *drm_get_drawable_info(struct drm_device *dev, drm_drawable_t id)
 170 {
 171         return idr_find(&dev->drw_idr, id);
 172 }
 173 EXPORT_SYMBOL(drm_get_drawable_info);
 174
 175 static int drm_drawable_free(int idr, void *p, void *data)
 176 {
 177         struct drm_drawable_info *info = p;
 178
 179         if (info) {
 180                 drm_free(info->rects, info->num_rects *
 181                          sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 182                 drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 183         }
 184
 185         return 0;
 186 }
 187
 188 void drm_drawable_free_all(struct drm_device *dev)
 189 {
 190         idr_for_each(&dev->drw_idr, drm_drawable_free, NULL);
 191         idr_remove_all(&dev->drw_idr);
 192 }