git.oblomov.eu Git - linux-2.6/blob - 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  * All Rights Reserved.
  16  *
  17  * Permission is hereby granted, free of charge, to any person obtaining a
  18  * copy of this software and associated documentation files (the "Software"),
  19  * to deal in the Software without restriction, including without limitation
  20  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  21  * and/or sell copies of the Software, and to permit persons to whom the
  22  * Software is furnished to do so, subject to the following conditions:
  23  *
  24  * The above copyright notice and this permission notice (including the next
  25  * paragraph) shall be included in all copies or substantial portions of the
  26  * Software.
  27  *
  28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  29  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  30  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  31  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  32  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  33  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  34  * OTHER DEALINGS IN THE SOFTWARE.
  35  */
  36
  37 #include "drmP.h"
  38
  39 /** No-op. */
  40 int drm_adddraw(DRM_IOCTL_ARGS)
  41 {
  42         DRM_DEVICE;
  43         unsigned long irqflags;
  44         int i, j = 0;
  45         drm_draw_t draw;
  46
  47         spin_lock_irqsave(&dev->drw_lock, irqflags);
  48
  49         for (i = 0; i < dev->drw_bitfield_length; i++) {
  50                 u32 bitfield = dev->drw_bitfield[i];
  51
  52                 if (bitfield == ~0)
  53                         continue;
  54
  55                 for (; j < sizeof(bitfield); j++)
  56                         if (!(bitfield & (1 << j)))
  57                                 goto done;
  58         }
  59 done:
  60
  61         if (i == dev->drw_bitfield_length) {
  62                 u32 *new_bitfield = drm_realloc(dev->drw_bitfield, i * 4,
  63                                                 (i + 1) * 4, DRM_MEM_BUFS);
  64
  65                 if (!new_bitfield) {
  66                         DRM_ERROR("Failed to allocate new drawable bitfield\n");
  67                         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  68                         return DRM_ERR(ENOMEM);
  69                 }
  70
  71                 if (32 * (i + 1) > dev->drw_info_length) {
  72                         void *new_info = drm_realloc(dev->drw_info,
  73                                                      dev->drw_info_length *
  74                                                      sizeof(drm_drawable_info_t*),
  75                                                      32 * (i + 1) *
  76                                                      sizeof(drm_drawable_info_t*),
  77                                                      DRM_MEM_BUFS);
  78
  79                         if (!new_info) {
  80                                 DRM_ERROR("Failed to allocate new drawable info"
  81                                           " array\n");
  82
  83                                 drm_free(new_bitfield, (i + 1) * 4, DRM_MEM_BUFS);
  84                                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  85                                 return DRM_ERR(ENOMEM);
  86                         }
  87
  88                         dev->drw_info = (drm_drawable_info_t**)new_info;
  89                 }
  90
  91                 new_bitfield[i] = 0;
  92
  93                 dev->drw_bitfield = new_bitfield;
  94                 dev->drw_bitfield_length++;
  95         }
  96
  97         dev->drw_bitfield[i] |= 1 << j;
  98
  99         draw.handle = i * sizeof(u32) + j;
 100         DRM_DEBUG("%d\n", draw.handle);
 101
 102         dev->drw_info[draw.handle] = NULL;
 103
 104         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 105
 106         DRM_COPY_TO_USER_IOCTL((drm_draw_t __user *)data, draw, sizeof(draw));
 107
 108         return 0;
 109 }
 110
 111 /** No-op. */
 112 int drm_rmdraw(DRM_IOCTL_ARGS)
 113 {
 114         DRM_DEVICE;
 115         drm_draw_t draw;
 116         unsigned int idx, mod;
 117         unsigned long irqflags;
 118
 119         DRM_COPY_FROM_USER_IOCTL(draw, (drm_draw_t __user *) data,
 120                                  sizeof(draw));
 121
 122         idx = draw.handle / 32;
 123         mod = draw.handle % 32;
 124
 125         spin_lock_irqsave(&dev->drw_lock, irqflags);
 126
 127         if (idx >= dev->drw_bitfield_length ||
 128             !(dev->drw_bitfield[idx] & (1 << mod))) {
 129                 DRM_DEBUG("No such drawable %d\n", draw.handle);
 130                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 131                 return 0;
 132         }
 133
 134         dev->drw_bitfield[idx] &= ~(1 << mod);
 135
 136         if (idx == (dev->drw_bitfield_length - 1)) {
 137                 while (idx >= 0 && !dev->drw_bitfield[idx])
 138                         --idx;
 139
 140                 if (idx != draw.handle / 32) {
 141                         u32 *new_bitfield = drm_realloc(dev->drw_bitfield,
 142                                                         dev->drw_bitfield_length * 4,
 143                                                         (idx + 1) * 4,
 144                                                         DRM_MEM_BUFS);
 145
 146                         if (new_bitfield || idx == -1) {
 147                                 dev->drw_bitfield = new_bitfield;
 148                                 dev->drw_bitfield_length = idx + 1;
 149                         }
 150                 }
 151         }
 152
 153         if (32 * dev->drw_bitfield_length < dev->drw_info_length) {
 154                 void *new_info = drm_realloc(dev->drw_info,
 155                                              dev->drw_info_length *
 156                                              sizeof(drm_drawable_info_t*),
 157                                              32 * dev->drw_bitfield_length *
 158                                              sizeof(drm_drawable_info_t*),
 159                                              DRM_MEM_BUFS);
 160
 161                 if (new_info || !dev->drw_bitfield_length) {
 162                         dev->drw_info = (drm_drawable_info_t**)new_info;
 163                         dev->drw_info_length = 32 * dev->drw_bitfield_length;
 164                 }
 165         }
 166
 167         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 168
 169         DRM_DEBUG("%d\n", draw.handle);
 170         return 0;
 171 }
 172
 173 int drm_update_drawable_info(DRM_IOCTL_ARGS) {
 174         DRM_DEVICE;
 175         drm_update_draw_t update;
 176         unsigned int id, idx, mod;
 177         unsigned long irqflags;
 178         drm_drawable_info_t *info;
 179         void *new_data;
 180
 181         DRM_COPY_FROM_USER_IOCTL(update, (drm_update_draw_t __user *) data,
 182                                  sizeof(update));
 183
 184         id = update.handle;
 185         idx = id / 32;
 186         mod = id % 32;
 187
 188         spin_lock_irqsave(&dev->drw_lock, irqflags);
 189
 190         if (idx >= dev->drw_bitfield_length ||
 191             !(dev->drw_bitfield[idx] & (1 << mod))) {
 192                 DRM_ERROR("No such drawable %d\n", update.handle);
 193                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 194                 return DRM_ERR(EINVAL);
 195         }
 196
 197         info = dev->drw_info[id];
 198
 199         if (!info) {
 200                 info = drm_calloc(1, sizeof(drm_drawable_info_t), DRM_MEM_BUFS);
 201
 202                 if (!info) {
 203                         DRM_ERROR("Failed to allocate drawable info memory\n");
 204                         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 205                         return DRM_ERR(ENOMEM);
 206                 }
 207
 208                 dev->drw_info[id] = info;
 209         }
 210
 211         switch (update.type) {
 212         case DRM_DRAWABLE_CLIPRECTS:
 213                 if (update.num != info->num_rects) {
 214                         new_data = drm_alloc(update.num *
 215                                              sizeof(drm_clip_rect_t),
 216                                              DRM_MEM_BUFS);
 217
 218                         if (!new_data) {
 219                                 DRM_ERROR("Can't allocate cliprect memory\n");
 220                                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 221                                 return DRM_ERR(ENOMEM);
 222                         }
 223
 224                         info->rects = new_data;
 225                 }
 226
 227                 if (DRM_COPY_FROM_USER(info->rects,
 228                                        (drm_clip_rect_t __user *)
 229                                        (unsigned long)update.data,
 230                                        update.num * sizeof(drm_clip_rect_t))) {
 231                         DRM_ERROR("Can't copy cliprects from userspace\n");
 232                         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 233                         return DRM_ERR(EFAULT);
 234                 }
 235
 236                 if (update.num != info->num_rects) {
 237                         drm_free(info->rects, info->num_rects *
 238                                  sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
 239                         info->num_rects = update.num;
 240                 }
 241
 242                 DRM_DEBUG("Updated %d cliprects for drawable %d\n",
 243                           info->num_rects, id);
 244                 break;
 245         default:
 246                 DRM_ERROR("Invalid update type %d\n", update.type);
 247                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 248                 return DRM_ERR(EINVAL);
 249         }
 250
 251         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 252
 253         return 0;
 254 }
 255
 256 /**
 257  * Caller must hold the drawable spinlock!
 258  */
 259 drm_drawable_info_t *drm_get_drawable_info(drm_device_t *dev, drm_drawable_t id) {
 260         unsigned int idx = id / 32, mod = id % 32;
 261
 262         if (idx >= dev->drw_bitfield_length ||
 263             !(dev->drw_bitfield[idx] & (1 << mod))) {
 264                 DRM_DEBUG("No such drawable %d\n", id);
 265                 return NULL;
 266         }
 267
 268         return dev->drw_info[id];
 269 }
 270 EXPORT_SYMBOL(drm_get_drawable_info);