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         int id, idx;
 136         unsigned int shift;
 137         unsigned long irqflags;
 138         u32 *bitfield = dev->drw_bitfield;
 139         unsigned int bitfield_length = dev->drw_bitfield_length;
 140         drm_drawable_info_t **info = dev->drw_info;
 141         unsigned int info_length = dev->drw_info_length;
 142
 143         DRM_COPY_FROM_USER_IOCTL(draw, (drm_draw_t __user *) data,
 144                                  sizeof(draw));
 145
 146         id = draw.handle - 1;
 147         idx = id / (8 * sizeof(*bitfield));
 148         shift = id % (8 * sizeof(*bitfield));
 149
 150         if (idx < 0 || idx >= bitfield_length ||
 151             !(bitfield[idx] & (1 << shift))) {
 152                 DRM_DEBUG("No such drawable %d\n", draw.handle);
 153                 return 0;
 154         }
 155
 156         spin_lock_irqsave(&dev->drw_lock, irqflags);
 157
 158         bitfield[idx] &= ~(1 << shift);
 159
 160         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 161
 162         if (info[id]) {
 163                 drm_free(info[id]->rects, info[id]->num_rects *
 164                          sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
 165                 drm_free(info[id], sizeof(**info), DRM_MEM_BUFS);
 166         }
 167
 168         /* Can we shrink the arrays? */
 169         if (idx == bitfield_length - 1) {
 170                 while (idx >= 0 && !bitfield[idx])
 171                         --idx;
 172
 173                 bitfield_length = idx + 1;
 174
 175                 if (idx != id / (8 * sizeof(*bitfield)))
 176                         bitfield = drm_alloc(bitfield_length *
 177                                              sizeof(*bitfield), DRM_MEM_BUFS);
 178
 179                 if (!bitfield && bitfield_length) {
 180                         bitfield = dev->drw_bitfield;
 181                         bitfield_length = dev->drw_bitfield_length;
 182                 }
 183         }
 184
 185         if (bitfield != dev->drw_bitfield) {
 186                 info_length = 8 * sizeof(*bitfield) * bitfield_length;
 187
 188                 info = drm_alloc(info_length * sizeof(*info), DRM_MEM_BUFS);
 189
 190                 if (!info && info_length) {
 191                         info = dev->drw_info;
 192                         info_length = dev->drw_info_length;
 193                 }
 194
 195                 spin_lock_irqsave(&dev->drw_lock, irqflags);
 196
 197                 memcpy(bitfield, dev->drw_bitfield, bitfield_length *
 198                        sizeof(*bitfield));
 199                 drm_free(dev->drw_bitfield, sizeof(*bitfield) *
 200                          dev->drw_bitfield_length, DRM_MEM_BUFS);
 201                 dev->drw_bitfield = bitfield;
 202                 dev->drw_bitfield_length = bitfield_length;
 203
 204                 if (info != dev->drw_info) {
 205                         memcpy(info, dev->drw_info, info_length *
 206                                sizeof(*info));
 207                         drm_free(dev->drw_info, sizeof(*info) *
 208                                  dev->drw_info_length, DRM_MEM_BUFS);
 209                         dev->drw_info = info;
 210                         dev->drw_info_length = info_length;
 211                 }
 212
 213                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 214         }
 215
 216         DRM_DEBUG("%d\n", draw.handle);
 217         return 0;
 218 }
 219
 220 int drm_update_drawable_info(DRM_IOCTL_ARGS) {
 221         DRM_DEVICE;
 222         drm_update_draw_t update;
 223         unsigned int id, idx, shift;
 224         u32 *bitfield = dev->drw_bitfield;
 225         unsigned long irqflags, bitfield_length = dev->drw_bitfield_length;
 226         drm_drawable_info_t *info;
 227         drm_clip_rect_t *rects;
 228         int err;
 229
 230         DRM_COPY_FROM_USER_IOCTL(update, (drm_update_draw_t __user *) data,
 231                                  sizeof(update));
 232
 233         id = update.handle - 1;
 234         idx = id / (8 * sizeof(*bitfield));
 235         shift = id % (8 * sizeof(*bitfield));
 236
 237         if (idx < 0 || idx >= bitfield_length ||
 238             !(bitfield[idx] & (1 << shift))) {
 239                 DRM_ERROR("No such drawable %d\n", update.handle);
 240                 return DRM_ERR(EINVAL);
 241         }
 242
 243         info = dev->drw_info[id];
 244
 245         if (!info) {
 246                 info = drm_calloc(1, sizeof(drm_drawable_info_t), DRM_MEM_BUFS);
 247
 248                 if (!info) {
 249                         DRM_ERROR("Failed to allocate drawable info memory\n");
 250                         return DRM_ERR(ENOMEM);
 251                 }
 252         }
 253
 254         switch (update.type) {
 255         case DRM_DRAWABLE_CLIPRECTS:
 256                 if (update.num != info->num_rects) {
 257                         rects = drm_alloc(update.num * sizeof(drm_clip_rect_t),
 258                                          DRM_MEM_BUFS);
 259                 } else
 260                         rects = info->rects;
 261
 262                 if (update.num && !rects) {
 263                         DRM_ERROR("Failed to allocate cliprect memory\n");
 264                         err = DRM_ERR(ENOMEM);
 265                         goto error;
 266                 }
 267
 268                 if (update.num && DRM_COPY_FROM_USER(rects,
 269                                                      (drm_clip_rect_t __user *)
 270                                                      (unsigned long)update.data,
 271                                                      update.num *
 272                                                      sizeof(*rects))) {
 273                         DRM_ERROR("Failed to copy cliprects from userspace\n");
 274                         err = DRM_ERR(EFAULT);
 275                         goto error;
 276                 }
 277
 278                 spin_lock_irqsave(&dev->drw_lock, irqflags);
 279
 280                 if (rects != info->rects) {
 281                         drm_free(info->rects, info->num_rects *
 282                                  sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
 283                 }
 284
 285                 info->rects = rects;
 286                 info->num_rects = update.num;
 287                 dev->drw_info[id] = info;
 288
 289                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 290
 291                 DRM_DEBUG("Updated %d cliprects for drawable %d\n",
 292                           info->num_rects, id);
 293                 break;
 294         default:
 295                 DRM_ERROR("Invalid update type %d\n", update.type);
 296                 return DRM_ERR(EINVAL);
 297         }
 298
 299         return 0;
 300
 301 error:
 302         if (!dev->drw_info[id])
 303                 drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 304         else if (rects != dev->drw_info[id]->rects)
 305                 drm_free(rects, update.num *
 306                          sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
 307
 308         return err;
 309 }
 310
 311 /**
 312  * Caller must hold the drawable spinlock!
 313  */
 314 drm_drawable_info_t *drm_get_drawable_info(drm_device_t *dev, drm_drawable_t id) {
 315         u32 *bitfield = dev->drw_bitfield;
 316         unsigned int idx, shift;
 317
 318         id--;
 319         idx = id / (8 * sizeof(*bitfield));
 320         shift = id % (8 * sizeof(*bitfield));
 321
 322         if (idx < 0 || idx >= dev->drw_bitfield_length ||
 323             !(bitfield[idx] & (1 << shift))) {
 324                 DRM_DEBUG("No such drawable %d\n", id);
 325                 return NULL;
 326         }
 327
 328         return dev->drw_info[id];
 329 }
 330 EXPORT_SYMBOL(drm_get_drawable_info);