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(DRM_IOCTL_ARGS)
  44 {
  45         DRM_DEVICE;
  46         unsigned long irqflags;
  47         struct drm_draw draw;
  48         int new_id = 0;
  49         int ret;
  50
  51 again:
  52         if (idr_pre_get(&dev->drw_idr, GFP_KERNEL) == 0) {
  53                 DRM_ERROR("Out of memory expanding drawable idr\n");
  54                 return -ENOMEM;
  55         }
  56
  57         spin_lock_irqsave(&dev->drw_lock, irqflags);
  58         ret = idr_get_new_above(&dev->drw_idr, NULL, 1, &new_id);
  59         if (ret == -EAGAIN) {
  60                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  61                 goto again;
  62         }
  63
  64         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  65
  66         draw.handle = new_id;
  67
  68         DRM_DEBUG("%d\n", draw.handle);
  69
  70         DRM_COPY_TO_USER_IOCTL((struct drm_draw __user *)data, draw, sizeof(draw));
  71
  72         return 0;
  73 }
  74
  75 /**
  76  * Free drawable ID and memory to store information about it.
  77  */
  78 int drm_rmdraw(DRM_IOCTL_ARGS)
  79 {
  80         DRM_DEVICE;
  81         struct drm_draw draw;
  82         unsigned long irqflags;
  83
  84         DRM_COPY_FROM_USER_IOCTL(draw, (struct drm_draw __user *) data,
  85                                  sizeof(draw));
  86
  87         spin_lock_irqsave(&dev->drw_lock, irqflags);
  88
  89         drm_free(drm_get_drawable_info(dev, draw.handle),
  90                  sizeof(struct drm_drawable_info), DRM_MEM_BUFS);
  91
  92         idr_remove(&dev->drw_idr, draw.handle);
  93
  94         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  95         DRM_DEBUG("%d\n", draw.handle);
  96         return 0;
  97 }
  98
  99 int drm_update_drawable_info(DRM_IOCTL_ARGS)
 100 {
 101         DRM_DEVICE;
 102         struct drm_update_draw update;
 103         unsigned long irqflags;
 104         struct drm_clip_rect *rects;
 105         struct drm_drawable_info *info;
 106         int err;
 107
 108         DRM_COPY_FROM_USER_IOCTL(update, (struct drm_update_draw __user *) data,
 109                                  sizeof(update));
 110
 111         info = idr_find(&dev->drw_idr, update.handle);
 112         if (!info) {
 113                 info = drm_calloc(1, sizeof(*info), DRM_MEM_BUFS);
 114                 if (!info)
 115                         return -ENOMEM;
 116                 if (IS_ERR(idr_replace(&dev->drw_idr, info, update.handle))) {
 117                         DRM_ERROR("No such drawable %d\n", update.handle);
 118                         drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 119                         return -EINVAL;
 120                 }
 121         }
 122
 123         switch (update.type) {
 124         case DRM_DRAWABLE_CLIPRECTS:
 125                 if (update.num != info->num_rects) {
 126                         rects = drm_alloc(update.num * sizeof(struct drm_clip_rect),
 127                                          DRM_MEM_BUFS);
 128                 } else
 129                         rects = info->rects;
 130
 131                 if (update.num && !rects) {
 132                         DRM_ERROR("Failed to allocate cliprect memory\n");
 133                         err = DRM_ERR(ENOMEM);
 134                         goto error;
 135                 }
 136
 137                 if (update.num && DRM_COPY_FROM_USER(rects,
 138                                                      (struct drm_clip_rect __user *)
 139                                                      (unsigned long)update.data,
 140                                                      update.num *
 141                                                      sizeof(*rects))) {
 142                         DRM_ERROR("Failed to copy cliprects from userspace\n");
 143                         err = DRM_ERR(EFAULT);
 144                         goto error;
 145                 }
 146
 147                 spin_lock_irqsave(&dev->drw_lock, irqflags);
 148
 149                 if (rects != info->rects) {
 150                         drm_free(info->rects, info->num_rects *
 151                                  sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 152                 }
 153
 154                 info->rects = rects;
 155                 info->num_rects = update.num;
 156
 157                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 158
 159                 DRM_DEBUG("Updated %d cliprects for drawable %d\n",
 160                           info->num_rects, update.handle);
 161                 break;
 162         default:
 163                 DRM_ERROR("Invalid update type %d\n", update.type);
 164                 return DRM_ERR(EINVAL);
 165         }
 166
 167         return 0;
 168
 169 error:
 170         if (rects != info->rects)
 171                 drm_free(rects, update.num * sizeof(struct drm_clip_rect),
 172                          DRM_MEM_BUFS);
 173
 174         return err;
 175 }
 176
 177 /**
 178  * Caller must hold the drawable spinlock!
 179  */
 180 struct drm_drawable_info *drm_get_drawable_info(struct drm_device *dev, drm_drawable_t id)
 181 {
 182         return idr_find(&dev->drw_idr, id);
 183 }
 184 EXPORT_SYMBOL(drm_get_drawable_info);
 185
 186 static int drm_drawable_free(int idr, void *p, void *data)
 187 {
 188         struct drm_drawable_info *info = p;
 189
 190         if (info) {
 191                 drm_free(info->rects, info->num_rects *
 192                          sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 193                 drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 194         }
 195
 196         return 0;
 197 }
 198
 199 void drm_drawable_free_all(struct drm_device *dev)
 200 {
 201         idr_for_each(&dev->drw_idr, drm_drawable_free, NULL);
 202         idr_remove_all(&dev->drw_idr);
 203 }