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         int i, j;
  48         u32 *bitfield = dev->drw_bitfield;
  49         unsigned int bitfield_length = dev->drw_bitfield_length;
  50         drm_drawable_info_t **info = dev->drw_info;
  51         unsigned int info_length = dev->drw_info_length;
  52         drm_draw_t draw;
  53
  54         for (i = 0, j = 0; i < bitfield_length; i++) {
  55                 if (bitfield[i] == ~0)
  56                         continue;
  57
  58                 for (; j < 8 * sizeof(*bitfield); j++)
  59                         if (!(bitfield[i] & (1 << j)))
  60                                 goto done;
  61         }
  62 done:
  63
  64         if (i == bitfield_length) {
  65                 bitfield_length++;
  66
  67                 bitfield = drm_alloc(bitfield_length * sizeof(*bitfield),
  68                                      DRM_MEM_BUFS);
  69
  70                 if (!bitfield) {
  71                         DRM_ERROR("Failed to allocate new drawable bitfield\n");
  72                         return DRM_ERR(ENOMEM);
  73                 }
  74
  75                 if (8 * sizeof(*bitfield) * bitfield_length > info_length) {
  76                         info_length += 8 * sizeof(*bitfield);
  77
  78                         info = drm_alloc(info_length * sizeof(*info),
  79                                          DRM_MEM_BUFS);
  80
  81                         if (!info) {
  82                                 DRM_ERROR("Failed to allocate new drawable info"
  83                                           " array\n");
  84
  85                                 drm_free(bitfield,
  86                                          bitfield_length * sizeof(*bitfield),
  87                                          DRM_MEM_BUFS);
  88                                 return DRM_ERR(ENOMEM);
  89                         }
  90                 }
  91
  92                 bitfield[i] = 0;
  93         }
  94
  95         draw.handle = i * 8 * sizeof(*bitfield) + j + 1;
  96         DRM_DEBUG("%d\n", draw.handle);
  97
  98         spin_lock_irqsave(&dev->drw_lock, irqflags);
  99
 100         bitfield[i] |= 1 << j;
 101         info[draw.handle - 1] = NULL;
 102
 103         if (bitfield != dev->drw_bitfield) {
 104                 memcpy(bitfield, dev->drw_bitfield, dev->drw_bitfield_length *
 105                        sizeof(*bitfield));
 106                 drm_free(dev->drw_bitfield, sizeof(*bitfield) *
 107                          dev->drw_bitfield_length, DRM_MEM_BUFS);
 108                 dev->drw_bitfield = bitfield;
 109                 dev->drw_bitfield_length = bitfield_length;
 110         }
 111
 112         if (info != dev->drw_info) {
 113                 memcpy(info, dev->drw_info, dev->drw_info_length *
 114                        sizeof(*info));
 115                 drm_free(dev->drw_info, sizeof(*info) * dev->drw_info_length,
 116                          DRM_MEM_BUFS);
 117                 dev->drw_info = info;
 118                 dev->drw_info_length = info_length;
 119         }
 120
 121         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 122
 123         DRM_COPY_TO_USER_IOCTL((drm_draw_t __user *)data, draw, sizeof(draw));
 124
 125         return 0;
 126 }
 127
 128 /**
 129  * Free drawable ID and memory to store information about it.
 130  */
 131 int drm_rmdraw(DRM_IOCTL_ARGS)
 132 {
 133         DRM_DEVICE;
 134         drm_draw_t draw;
 135         unsigned int id, idx, shift;
 136         unsigned long irqflags;
 137         u32 *bitfield = dev->drw_bitfield;
 138         unsigned int bitfield_length = dev->drw_bitfield_length;
 139         drm_drawable_info_t **info = dev->drw_info;
 140         unsigned int info_length = dev->drw_info_length;
 141
 142         DRM_COPY_FROM_USER_IOCTL(draw, (drm_draw_t __user *) data,
 143                                  sizeof(draw));
 144
 145         id = draw.handle - 1;
 146         idx = id / (8 * sizeof(*bitfield));
 147         shift = id % (8 * sizeof(*bitfield));
 148
 149         if (idx < 0 || idx >= bitfield_length ||
 150             !(bitfield[idx] & (1 << shift))) {
 151                 DRM_DEBUG("No such drawable %d\n", draw.handle);
 152                 return 0;
 153         }
 154
 155         spin_lock_irqsave(&dev->drw_lock, irqflags);
 156
 157         bitfield[idx] &= ~(1 << shift);
 158
 159         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 160
 161         if (info[id]) {
 162                 drm_free(info[id]->rects, info[id]->num_rects *
 163                          sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
 164                 drm_free(info[id], sizeof(**info), DRM_MEM_BUFS);
 165         }
 166
 167         /* Can we shrink the arrays? */
 168         if (idx == bitfield_length - 1) {
 169                 while (idx >= 0 && !bitfield[idx])
 170                         --idx;
 171
 172                 bitfield_length = idx + 1;
 173
 174                 if (idx != id / (8 * sizeof(*bitfield)))
 175                         bitfield = drm_alloc(bitfield_length *
 176                                              sizeof(*bitfield), DRM_MEM_BUFS);
 177
 178                 if (!bitfield && bitfield_length) {
 179                         bitfield = dev->drw_bitfield;
 180                         bitfield_length = dev->drw_bitfield_length;
 181                 }
 182         }
 183
 184         if (bitfield != dev->drw_bitfield) {
 185                 info_length = 8 * sizeof(*bitfield) * bitfield_length;
 186
 187                 info = drm_alloc(info_length * sizeof(*info), DRM_MEM_BUFS);
 188
 189                 if (!info && info_length) {
 190                         info = dev->drw_info;
 191                         info_length = dev->drw_info_length;
 192                 }
 193
 194                 spin_lock_irqsave(&dev->drw_lock, irqflags);
 195
 196                 memcpy(bitfield, dev->drw_bitfield, bitfield_length *
 197                        sizeof(*bitfield));
 198                 drm_free(dev->drw_bitfield, sizeof(*bitfield) *
 199                          dev->drw_bitfield_length, DRM_MEM_BUFS);
 200                 dev->drw_bitfield = bitfield;
 201                 dev->drw_bitfield_length = bitfield_length;
 202
 203                 if (info != dev->drw_info) {
 204                         memcpy(info, dev->drw_info, info_length *
 205                                sizeof(*info));
 206                         drm_free(dev->drw_info, sizeof(*info) *
 207                                  dev->drw_info_length, DRM_MEM_BUFS);
 208                         dev->drw_info = info;
 209                         dev->drw_info_length = info_length;
 210                 }
 211
 212                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 213         }
 214
 215         DRM_DEBUG("%d\n", draw.handle);
 216         return 0;
 217 }
 218
 219 int drm_update_drawable_info(DRM_IOCTL_ARGS) {
 220         DRM_DEVICE;
 221         drm_update_draw_t update;
 222         unsigned int id, idx, shift;
 223         u32 *bitfield = dev->drw_bitfield;
 224         unsigned long irqflags, bitfield_length = dev->drw_bitfield_length;
 225         drm_drawable_info_t *info;
 226         drm_clip_rect_t *rects;
 227         int err;
 228
 229         DRM_COPY_FROM_USER_IOCTL(update, (drm_update_draw_t __user *) data,
 230                                  sizeof(update));
 231
 232         id = update.handle - 1;
 233         idx = id / (8 * sizeof(*bitfield));
 234         shift = id % (8 * sizeof(*bitfield));
 235
 236         if (idx < 0 || idx >= bitfield_length ||
 237             !(bitfield[idx] & (1 << shift))) {
 238                 DRM_ERROR("No such drawable %d\n", update.handle);
 239                 return DRM_ERR(EINVAL);
 240         }
 241
 242         info = dev->drw_info[id];
 243
 244         if (!info) {
 245                 info = drm_calloc(1, sizeof(drm_drawable_info_t), DRM_MEM_BUFS);
 246
 247                 if (!info) {
 248                         DRM_ERROR("Failed to allocate drawable info memory\n");
 249                         return DRM_ERR(ENOMEM);
 250                 }
 251         }
 252
 253         switch (update.type) {
 254         case DRM_DRAWABLE_CLIPRECTS:
 255                 if (update.num != info->num_rects) {
 256                         rects = drm_alloc(update.num * sizeof(drm_clip_rect_t),
 257                                          DRM_MEM_BUFS);
 258                 } else
 259                         rects = info->rects;
 260
 261                 if (update.num && !rects) {
 262                         DRM_ERROR("Failed to allocate cliprect memory\n");
 263                         err = DRM_ERR(ENOMEM);
 264                         goto error;
 265                 }
 266
 267                 if (update.num && DRM_COPY_FROM_USER(rects,
 268                                                      (drm_clip_rect_t __user *)
 269                                                      (unsigned long)update.data,
 270                                                      update.num *
 271                                                      sizeof(*rects))) {
 272                         DRM_ERROR("Failed to copy cliprects from userspace\n");
 273                         err = DRM_ERR(EFAULT);
 274                         goto error;
 275                 }
 276
 277                 spin_lock_irqsave(&dev->drw_lock, irqflags);
 278
 279                 if (rects != info->rects) {
 280                         drm_free(info->rects, info->num_rects *
 281                                  sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
 282                 }
 283
 284                 info->rects = rects;
 285                 info->num_rects = update.num;
 286                 dev->drw_info[id] = info;
 287
 288                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 289
 290                 DRM_DEBUG("Updated %d cliprects for drawable %d\n",
 291                           info->num_rects, id);
 292                 break;
 293         default:
 294                 DRM_ERROR("Invalid update type %d\n", update.type);
 295                 return DRM_ERR(EINVAL);
 296         }
 297
 298         return 0;
 299
 300 error:
 301         if (!dev->drw_info[id])
 302                 drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 303         else if (rects != dev->drw_info[id]->rects)
 304                 drm_free(rects, update.num *
 305                          sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
 306
 307         return err;
 308 }
 309
 310 /**
 311  * Caller must hold the drawable spinlock!
 312  */
 313 drm_drawable_info_t *drm_get_drawable_info(drm_device_t *dev, drm_drawable_t id) {
 314         u32 *bitfield = dev->drw_bitfield;
 315         unsigned int idx, shift;
 316
 317         id--;
 318         idx = id / (8 * sizeof(*bitfield));
 319         shift = id % (8 * sizeof(*bitfield));
 320
 321         if (idx < 0 || idx >= dev->drw_bitfield_length ||
 322             !(bitfield[idx] & (1 << shift))) {
 323                 DRM_DEBUG("No such drawable %d\n", id);
 324                 return NULL;
 325         }
 326
 327         return dev->drw_info[id];
 328 }
 329 EXPORT_SYMBOL(drm_get_drawable_info);