drivers/gpu/drm/drm_ioc32.c

   1 /*
   2  * \file drm_ioc32.c
   3  *
   4  * 32-bit ioctl compatibility routines for the DRM.
   5  *
   6  * \author Paul Mackerras <paulus@samba.org>
   7  *
   8  * Copyright (C) Paul Mackerras 2005.
   9  * All Rights Reserved.
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice (including the next
  19  * paragraph) shall be included in all copies or substantial portions of the
  20  * Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  26  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  27  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  28  * IN THE SOFTWARE.
  29  */
  30 #include <linux/compat.h>
  31 #include <linux/ratelimit.h>
  32 #include <linux/export.h>
  33
  34 #include <drm/drm_agpsupport.h>
  35 #include <drm/drm_file.h>
  36 #include <drm/drm_print.h>
  37
  38 #include "drm_crtc_internal.h"
  39 #include "drm_internal.h"
  40 #include "drm_legacy.h"
  41
  42 #define DRM_IOCTL_VERSION32             DRM_IOWR(0x00, drm_version32_t)
  43 #define DRM_IOCTL_GET_UNIQUE32          DRM_IOWR(0x01, drm_unique32_t)
  44 #define DRM_IOCTL_GET_MAP32             DRM_IOWR(0x04, drm_map32_t)
  45 #define DRM_IOCTL_GET_CLIENT32          DRM_IOWR(0x05, drm_client32_t)
  46 #define DRM_IOCTL_GET_STATS32           DRM_IOR( 0x06, drm_stats32_t)
  47
  48 #define DRM_IOCTL_SET_UNIQUE32          DRM_IOW( 0x10, drm_unique32_t)
  49 #define DRM_IOCTL_ADD_MAP32             DRM_IOWR(0x15, drm_map32_t)
  50 #define DRM_IOCTL_ADD_BUFS32            DRM_IOWR(0x16, drm_buf_desc32_t)
  51 #define DRM_IOCTL_MARK_BUFS32           DRM_IOW( 0x17, drm_buf_desc32_t)
  52 #define DRM_IOCTL_INFO_BUFS32           DRM_IOWR(0x18, drm_buf_info32_t)
  53 #define DRM_IOCTL_MAP_BUFS32            DRM_IOWR(0x19, drm_buf_map32_t)
  54 #define DRM_IOCTL_FREE_BUFS32           DRM_IOW( 0x1a, drm_buf_free32_t)
  55
  56 #define DRM_IOCTL_RM_MAP32              DRM_IOW( 0x1b, drm_map32_t)
  57
  58 #define DRM_IOCTL_SET_SAREA_CTX32       DRM_IOW( 0x1c, drm_ctx_priv_map32_t)
  59 #define DRM_IOCTL_GET_SAREA_CTX32       DRM_IOWR(0x1d, drm_ctx_priv_map32_t)
  60
  61 #define DRM_IOCTL_RES_CTX32             DRM_IOWR(0x26, drm_ctx_res32_t)
  62 #define DRM_IOCTL_DMA32                 DRM_IOWR(0x29, drm_dma32_t)
  63
  64 #define DRM_IOCTL_AGP_ENABLE32          DRM_IOW( 0x32, drm_agp_mode32_t)
  65 #define DRM_IOCTL_AGP_INFO32            DRM_IOR( 0x33, drm_agp_info32_t)
  66 #define DRM_IOCTL_AGP_ALLOC32           DRM_IOWR(0x34, drm_agp_buffer32_t)
  67 #define DRM_IOCTL_AGP_FREE32            DRM_IOW( 0x35, drm_agp_buffer32_t)
  68 #define DRM_IOCTL_AGP_BIND32            DRM_IOW( 0x36, drm_agp_binding32_t)
  69 #define DRM_IOCTL_AGP_UNBIND32          DRM_IOW( 0x37, drm_agp_binding32_t)
  70
  71 #define DRM_IOCTL_SG_ALLOC32            DRM_IOW( 0x38, drm_scatter_gather32_t)
  72 #define DRM_IOCTL_SG_FREE32             DRM_IOW( 0x39, drm_scatter_gather32_t)
  73
  74 #define DRM_IOCTL_UPDATE_DRAW32         DRM_IOW( 0x3f, drm_update_draw32_t)
  75
  76 #define DRM_IOCTL_WAIT_VBLANK32         DRM_IOWR(0x3a, drm_wait_vblank32_t)
  77
  78 #define DRM_IOCTL_MODE_ADDFB232         DRM_IOWR(0xb8, drm_mode_fb_cmd232_t)
  79
  80 typedef struct drm_version_32 {
  81         int version_major;        /* Major version */
  82         int version_minor;        /* Minor version */
  83         int version_patchlevel;    /* Patch level */
  84         u32 name_len;             /* Length of name buffer */
  85         u32 name;                 /* Name of driver */
  86         u32 date_len;             /* Length of date buffer */
  87         u32 date;                 /* User-space buffer to hold date */
  88         u32 desc_len;             /* Length of desc buffer */
  89         u32 desc;                 /* User-space buffer to hold desc */
  90 } drm_version32_t;
  91
  92 static int compat_drm_version(struct file *file, unsigned int cmd,
  93                               unsigned long arg)
  94 {
  95         drm_version32_t v32;
  96         struct drm_version v;
  97         int err;
  98
  99         if (copy_from_user(&v32, (void __user *)arg, sizeof(v32)))
 100                 return -EFAULT;
 101
 102         v = (struct drm_version) {
 103                 .name_len = v32.name_len,
 104                 .name = compat_ptr(v32.name),
 105                 .date_len = v32.date_len,
 106                 .date = compat_ptr(v32.date),
 107                 .desc_len = v32.desc_len,
 108                 .desc = compat_ptr(v32.desc),
 109         };
 110         err = drm_ioctl_kernel(file, drm_version, &v,
 111                                DRM_RENDER_ALLOW);
 112         if (err)
 113                 return err;
 114
 115         v32.version_major = v.version_major;
 116         v32.version_minor = v.version_minor;
 117         v32.version_patchlevel = v.version_patchlevel;
 118         v32.name_len = v.name_len;
 119         v32.date_len = v.date_len;
 120         v32.desc_len = v.desc_len;
 121         if (copy_to_user((void __user *)arg, &v32, sizeof(v32)))
 122                 return -EFAULT;
 123         return 0;
 124 }
 125
 126 typedef struct drm_unique32 {
 127         u32 unique_len; /* Length of unique */
 128         u32 unique;     /* Unique name for driver instantiation */
 129 } drm_unique32_t;
 130
 131 static int compat_drm_getunique(struct file *file, unsigned int cmd,
 132                                 unsigned long arg)
 133 {
 134         drm_unique32_t uq32;
 135         struct drm_unique uq;
 136         int err;
 137
 138         if (copy_from_user(&uq32, (void __user *)arg, sizeof(uq32)))
 139                 return -EFAULT;
 140         uq = (struct drm_unique){
 141                 .unique_len = uq32.unique_len,
 142                 .unique = compat_ptr(uq32.unique),
 143         };
 144
 145         err = drm_ioctl_kernel(file, drm_getunique, &uq, 0);
 146         if (err)
 147                 return err;
 148
 149         uq32.unique_len = uq.unique_len;
 150         if (copy_to_user((void __user *)arg, &uq32, sizeof(uq32)))
 151                 return -EFAULT;
 152         return 0;
 153 }
 154
 155 static int compat_drm_setunique(struct file *file, unsigned int cmd,
 156                                 unsigned long arg)
 157 {
 158         /* it's dead */
 159         return -EINVAL;
 160 }
 161
 162 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 163 typedef struct drm_map32 {
 164         u32 offset;             /* Requested physical address (0 for SAREA) */
 165         u32 size;               /* Requested physical size (bytes) */
 166         enum drm_map_type type; /* Type of memory to map */
 167         enum drm_map_flags flags;       /* Flags */
 168         u32 handle;             /* User-space: "Handle" to pass to mmap() */
 169         int mtrr;               /* MTRR slot used */
 170 } drm_map32_t;
 171
 172 static int compat_drm_getmap(struct file *file, unsigned int cmd,
 173                              unsigned long arg)
 174 {
 175         drm_map32_t __user *argp = (void __user *)arg;
 176         drm_map32_t m32;
 177         struct drm_map map;
 178         int err;
 179
 180         if (copy_from_user(&m32, argp, sizeof(m32)))
 181                 return -EFAULT;
 182
 183         map.offset = m32.offset;
 184         err = drm_ioctl_kernel(file, drm_legacy_getmap_ioctl, &map, 0);
 185         if (err)
 186                 return err;
 187
 188         m32.offset = map.offset;
 189         m32.size = map.size;
 190         m32.type = map.type;
 191         m32.flags = map.flags;
 192         m32.handle = ptr_to_compat((void __user *)map.handle);
 193         m32.mtrr = map.mtrr;
 194         if (copy_to_user(argp, &m32, sizeof(m32)))
 195                 return -EFAULT;
 196         return 0;
 197
 198 }
 199
 200 static int compat_drm_addmap(struct file *file, unsigned int cmd,
 201                              unsigned long arg)
 202 {
 203         drm_map32_t __user *argp = (void __user *)arg;
 204         drm_map32_t m32;
 205         struct drm_map map;
 206         int err;
 207
 208         if (copy_from_user(&m32, argp, sizeof(m32)))
 209                 return -EFAULT;
 210
 211         map.offset = m32.offset;
 212         map.size = m32.size;
 213         map.type = m32.type;
 214         map.flags = m32.flags;
 215
 216         err = drm_ioctl_kernel(file, drm_legacy_addmap_ioctl, &map,
 217                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 218         if (err)
 219                 return err;
 220
 221         m32.offset = map.offset;
 222         m32.mtrr = map.mtrr;
 223         m32.handle = ptr_to_compat((void __user *)map.handle);
 224         if (map.handle != compat_ptr(m32.handle))
 225                 pr_err_ratelimited("compat_drm_addmap truncated handle %p for type %d offset %x\n",
 226                                    map.handle, m32.type, m32.offset);
 227
 228         if (copy_to_user(argp, &m32, sizeof(m32)))
 229                 return -EFAULT;
 230
 231         return 0;
 232 }
 233
 234 static int compat_drm_rmmap(struct file *file, unsigned int cmd,
 235                             unsigned long arg)
 236 {
 237         drm_map32_t __user *argp = (void __user *)arg;
 238         struct drm_map map;
 239         u32 handle;
 240
 241         if (get_user(handle, &argp->handle))
 242                 return -EFAULT;
 243         map.handle = compat_ptr(handle);
 244         return drm_ioctl_kernel(file, drm_legacy_rmmap_ioctl, &map, DRM_AUTH);
 245 }
 246 #endif
 247
 248 typedef struct drm_client32 {
 249         int idx;        /* Which client desired? */
 250         int auth;       /* Is client authenticated? */
 251         u32 pid;        /* Process ID */
 252         u32 uid;        /* User ID */
 253         u32 magic;      /* Magic */
 254         u32 iocs;       /* Ioctl count */
 255 } drm_client32_t;
 256
 257 static int compat_drm_getclient(struct file *file, unsigned int cmd,
 258                                 unsigned long arg)
 259 {
 260         drm_client32_t c32;
 261         drm_client32_t __user *argp = (void __user *)arg;
 262         struct drm_client client;
 263         int err;
 264
 265         if (copy_from_user(&c32, argp, sizeof(c32)))
 266                 return -EFAULT;
 267
 268         client.idx = c32.idx;
 269
 270         err = drm_ioctl_kernel(file, drm_getclient, &client, 0);
 271         if (err)
 272                 return err;
 273
 274         c32.idx = client.idx;
 275         c32.auth = client.auth;
 276         c32.pid = client.pid;
 277         c32.uid = client.uid;
 278         c32.magic = client.magic;
 279         c32.iocs = client.iocs;
 280
 281         if (copy_to_user(argp, &c32, sizeof(c32)))
 282                 return -EFAULT;
 283         return 0;
 284 }
 285
 286 typedef struct drm_stats32 {
 287         u32 count;
 288         struct {
 289                 u32 value;
 290                 enum drm_stat_type type;
 291         } data[15];
 292 } drm_stats32_t;
 293
 294 static int compat_drm_getstats(struct file *file, unsigned int cmd,
 295                                unsigned long arg)
 296 {
 297         drm_stats32_t __user *argp = (void __user *)arg;
 298         int err;
 299
 300         err = drm_ioctl_kernel(file, drm_noop, NULL, 0);
 301         if (err)
 302                 return err;
 303
 304         if (clear_user(argp, sizeof(drm_stats32_t)))
 305                 return -EFAULT;
 306         return 0;
 307 }
 308
 309 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 310 typedef struct drm_buf_desc32 {
 311         int count;               /* Number of buffers of this size */
 312         int size;                /* Size in bytes */
 313         int low_mark;            /* Low water mark */
 314         int high_mark;           /* High water mark */
 315         int flags;
 316         u32 agp_start;           /* Start address in the AGP aperture */
 317 } drm_buf_desc32_t;
 318
 319 static int compat_drm_addbufs(struct file *file, unsigned int cmd,
 320                               unsigned long arg)
 321 {
 322         drm_buf_desc32_t __user *argp = (void __user *)arg;
 323         drm_buf_desc32_t desc32;
 324         struct drm_buf_desc desc;
 325         int err;
 326
 327         if (copy_from_user(&desc32, argp, sizeof(drm_buf_desc32_t)))
 328                 return -EFAULT;
 329
 330         desc = (struct drm_buf_desc){
 331                 desc32.count, desc32.size, desc32.low_mark, desc32.high_mark,
 332                 desc32.flags, desc32.agp_start
 333         };
 334
 335         err = drm_ioctl_kernel(file, drm_legacy_addbufs, &desc,
 336                                    DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 337         if (err)
 338                 return err;
 339
 340         desc32 = (drm_buf_desc32_t){
 341                 desc.count, desc.size, desc.low_mark, desc.high_mark,
 342                 desc.flags, desc.agp_start
 343         };
 344         if (copy_to_user(argp, &desc32, sizeof(drm_buf_desc32_t)))
 345                 return -EFAULT;
 346
 347         return 0;
 348 }
 349
 350 static int compat_drm_markbufs(struct file *file, unsigned int cmd,
 351                                unsigned long arg)
 352 {
 353         drm_buf_desc32_t b32;
 354         drm_buf_desc32_t __user *argp = (void __user *)arg;
 355         struct drm_buf_desc buf;
 356
 357         if (copy_from_user(&b32, argp, sizeof(b32)))
 358                 return -EFAULT;
 359
 360         buf.size = b32.size;
 361         buf.low_mark = b32.low_mark;
 362         buf.high_mark = b32.high_mark;
 363
 364         return drm_ioctl_kernel(file, drm_legacy_markbufs, &buf,
 365                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 366 }
 367
 368 typedef struct drm_buf_info32 {
 369         int count;              /**< Entries in list */
 370         u32 list;
 371 } drm_buf_info32_t;
 372
 373 static int copy_one_buf32(void *data, int count, struct drm_buf_entry *from)
 374 {
 375         drm_buf_info32_t *request = data;
 376         drm_buf_desc32_t __user *to = compat_ptr(request->list);
 377         drm_buf_desc32_t v = {.count = from->buf_count,
 378                               .size = from->buf_size,
 379                               .low_mark = from->low_mark,
 380                               .high_mark = from->high_mark};
 381
 382         if (copy_to_user(to + count, &v, offsetof(drm_buf_desc32_t, flags)))
 383                 return -EFAULT;
 384         return 0;
 385 }
 386
 387 static int drm_legacy_infobufs32(struct drm_device *dev, void *data,
 388                         struct drm_file *file_priv)
 389 {
 390         drm_buf_info32_t *request = data;
 391
 392         return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf32);
 393 }
 394
 395 static int compat_drm_infobufs(struct file *file, unsigned int cmd,
 396                                unsigned long arg)
 397 {
 398         drm_buf_info32_t req32;
 399         drm_buf_info32_t __user *argp = (void __user *)arg;
 400         int err;
 401
 402         if (copy_from_user(&req32, argp, sizeof(req32)))
 403                 return -EFAULT;
 404
 405         if (req32.count < 0)
 406                 req32.count = 0;
 407
 408         err = drm_ioctl_kernel(file, drm_legacy_infobufs32, &req32, DRM_AUTH);
 409         if (err)
 410                 return err;
 411
 412         if (put_user(req32.count, &argp->count))
 413                 return -EFAULT;
 414
 415         return 0;
 416 }
 417
 418 typedef struct drm_buf_pub32 {
 419         int idx;                /**< Index into the master buffer list */
 420         int total;              /**< Buffer size */
 421         int used;               /**< Amount of buffer in use (for DMA) */
 422         u32 address;            /**< Address of buffer */
 423 } drm_buf_pub32_t;
 424
 425 typedef struct drm_buf_map32 {
 426         int count;              /**< Length of the buffer list */
 427         u32 virtual;            /**< Mmap'd area in user-virtual */
 428         u32 list;               /**< Buffer information */
 429 } drm_buf_map32_t;
 430
 431 static int map_one_buf32(void *data, int idx, unsigned long virtual,
 432                         struct drm_buf *buf)
 433 {
 434         drm_buf_map32_t *request = data;
 435         drm_buf_pub32_t __user *to = compat_ptr(request->list) + idx;
 436         drm_buf_pub32_t v;
 437
 438         v.idx = buf->idx;
 439         v.total = buf->total;
 440         v.used = 0;
 441         v.address = virtual + buf->offset;
 442         if (copy_to_user(to, &v, sizeof(v)))
 443                 return -EFAULT;
 444         return 0;
 445 }
 446
 447 static int drm_legacy_mapbufs32(struct drm_device *dev, void *data,
 448                        struct drm_file *file_priv)
 449 {
 450         drm_buf_map32_t *request = data;
 451         void __user *v;
 452         int err = __drm_legacy_mapbufs(dev, data, &request->count,
 453                                     &v, map_one_buf32,
 454                                     file_priv);
 455         request->virtual = ptr_to_compat(v);
 456         return err;
 457 }
 458
 459 static int compat_drm_mapbufs(struct file *file, unsigned int cmd,
 460                               unsigned long arg)
 461 {
 462         drm_buf_map32_t __user *argp = (void __user *)arg;
 463         drm_buf_map32_t req32;
 464         int err;
 465
 466         if (copy_from_user(&req32, argp, sizeof(req32)))
 467                 return -EFAULT;
 468         if (req32.count < 0)
 469                 return -EINVAL;
 470
 471         err = drm_ioctl_kernel(file, drm_legacy_mapbufs32, &req32, DRM_AUTH);
 472         if (err)
 473                 return err;
 474
 475         if (put_user(req32.count, &argp->count)
 476             || put_user(req32.virtual, &argp->virtual))
 477                 return -EFAULT;
 478
 479         return 0;
 480 }
 481
 482 typedef struct drm_buf_free32 {
 483         int count;
 484         u32 list;
 485 } drm_buf_free32_t;
 486
 487 static int compat_drm_freebufs(struct file *file, unsigned int cmd,
 488                                unsigned long arg)
 489 {
 490         drm_buf_free32_t req32;
 491         struct drm_buf_free request;
 492         drm_buf_free32_t __user *argp = (void __user *)arg;
 493
 494         if (copy_from_user(&req32, argp, sizeof(req32)))
 495                 return -EFAULT;
 496
 497         request.count = req32.count;
 498         request.list = compat_ptr(req32.list);
 499         return drm_ioctl_kernel(file, drm_legacy_freebufs, &request, DRM_AUTH);
 500 }
 501
 502 typedef struct drm_ctx_priv_map32 {
 503         unsigned int ctx_id;     /**< Context requesting private mapping */
 504         u32 handle;             /**< Handle of map */
 505 } drm_ctx_priv_map32_t;
 506
 507 static int compat_drm_setsareactx(struct file *file, unsigned int cmd,
 508                                   unsigned long arg)
 509 {
 510         drm_ctx_priv_map32_t req32;
 511         struct drm_ctx_priv_map request;
 512         drm_ctx_priv_map32_t __user *argp = (void __user *)arg;
 513
 514         if (copy_from_user(&req32, argp, sizeof(req32)))
 515                 return -EFAULT;
 516
 517         request.ctx_id = req32.ctx_id;
 518         request.handle = compat_ptr(req32.handle);
 519         return drm_ioctl_kernel(file, drm_legacy_setsareactx, &request,
 520                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 521 }
 522
 523 static int compat_drm_getsareactx(struct file *file, unsigned int cmd,
 524                                   unsigned long arg)
 525 {
 526         struct drm_ctx_priv_map req;
 527         drm_ctx_priv_map32_t req32;
 528         drm_ctx_priv_map32_t __user *argp = (void __user *)arg;
 529         int err;
 530
 531         if (copy_from_user(&req32, argp, sizeof(req32)))
 532                 return -EFAULT;
 533
 534         req.ctx_id = req32.ctx_id;
 535         err = drm_ioctl_kernel(file, drm_legacy_getsareactx, &req, DRM_AUTH);
 536         if (err)
 537                 return err;
 538
 539         req32.handle = ptr_to_compat((void __user *)req.handle);
 540         if (copy_to_user(argp, &req32, sizeof(req32)))
 541                 return -EFAULT;
 542
 543         return 0;
 544 }
 545
 546 typedef struct drm_ctx_res32 {
 547         int count;
 548         u32 contexts;
 549 } drm_ctx_res32_t;
 550
 551 static int compat_drm_resctx(struct file *file, unsigned int cmd,
 552                              unsigned long arg)
 553 {
 554         drm_ctx_res32_t __user *argp = (void __user *)arg;
 555         drm_ctx_res32_t res32;
 556         struct drm_ctx_res res;
 557         int err;
 558
 559         if (copy_from_user(&res32, argp, sizeof(res32)))
 560                 return -EFAULT;
 561
 562         res.count = res32.count;
 563         res.contexts = compat_ptr(res32.contexts);
 564         err = drm_ioctl_kernel(file, drm_legacy_resctx, &res, DRM_AUTH);
 565         if (err)
 566                 return err;
 567
 568         res32.count = res.count;
 569         if (copy_to_user(argp, &res32, sizeof(res32)))
 570                 return -EFAULT;
 571
 572         return 0;
 573 }
 574
 575 typedef struct drm_dma32 {
 576         int context;              /**< Context handle */
 577         int send_count;           /**< Number of buffers to send */
 578         u32 send_indices;         /**< List of handles to buffers */
 579         u32 send_sizes;           /**< Lengths of data to send */
 580         enum drm_dma_flags flags;                 /**< Flags */
 581         int request_count;        /**< Number of buffers requested */
 582         int request_size;         /**< Desired size for buffers */
 583         u32 request_indices;      /**< Buffer information */
 584         u32 request_sizes;
 585         int granted_count;        /**< Number of buffers granted */
 586 } drm_dma32_t;
 587
 588 static int compat_drm_dma(struct file *file, unsigned int cmd,
 589                           unsigned long arg)
 590 {
 591         drm_dma32_t d32;
 592         drm_dma32_t __user *argp = (void __user *)arg;
 593         struct drm_dma d;
 594         int err;
 595
 596         if (copy_from_user(&d32, argp, sizeof(d32)))
 597                 return -EFAULT;
 598
 599         d.context = d32.context;
 600         d.send_count = d32.send_count;
 601         d.send_indices = compat_ptr(d32.send_indices);
 602         d.send_sizes = compat_ptr(d32.send_sizes);
 603         d.flags = d32.flags;
 604         d.request_count = d32.request_count;
 605         d.request_indices = compat_ptr(d32.request_indices);
 606         d.request_sizes = compat_ptr(d32.request_sizes);
 607         err = drm_ioctl_kernel(file, drm_legacy_dma_ioctl, &d, DRM_AUTH);
 608         if (err)
 609                 return err;
 610
 611         if (put_user(d.request_size, &argp->request_size)
 612             || put_user(d.granted_count, &argp->granted_count))
 613                 return -EFAULT;
 614
 615         return 0;
 616 }
 617 #endif
 618
 619 #if IS_ENABLED(CONFIG_AGP)
 620 typedef struct drm_agp_mode32 {
 621         u32 mode;       /**< AGP mode */
 622 } drm_agp_mode32_t;
 623
 624 static int compat_drm_agp_enable(struct file *file, unsigned int cmd,
 625                                  unsigned long arg)
 626 {
 627         drm_agp_mode32_t __user *argp = (void __user *)arg;
 628         struct drm_agp_mode mode;
 629
 630         if (get_user(mode.mode, &argp->mode))
 631                 return -EFAULT;
 632
 633         return drm_ioctl_kernel(file,  drm_agp_enable_ioctl, &mode,
 634                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 635 }
 636
 637 typedef struct drm_agp_info32 {
 638         int agp_version_major;
 639         int agp_version_minor;
 640         u32 mode;
 641         u32 aperture_base;      /* physical address */
 642         u32 aperture_size;      /* bytes */
 643         u32 memory_allowed;     /* bytes */
 644         u32 memory_used;
 645
 646         /* PCI information */
 647         unsigned short id_vendor;
 648         unsigned short id_device;
 649 } drm_agp_info32_t;
 650
 651 static int compat_drm_agp_info(struct file *file, unsigned int cmd,
 652                                unsigned long arg)
 653 {
 654         drm_agp_info32_t __user *argp = (void __user *)arg;
 655         drm_agp_info32_t i32;
 656         struct drm_agp_info info;
 657         int err;
 658
 659         err = drm_ioctl_kernel(file, drm_agp_info_ioctl, &info, DRM_AUTH);
 660         if (err)
 661                 return err;
 662
 663         i32.agp_version_major = info.agp_version_major;
 664         i32.agp_version_minor = info.agp_version_minor;
 665         i32.mode = info.mode;
 666         i32.aperture_base = info.aperture_base;
 667         i32.aperture_size = info.aperture_size;
 668         i32.memory_allowed = info.memory_allowed;
 669         i32.memory_used = info.memory_used;
 670         i32.id_vendor = info.id_vendor;
 671         i32.id_device = info.id_device;
 672         if (copy_to_user(argp, &i32, sizeof(i32)))
 673                 return -EFAULT;
 674
 675         return 0;
 676 }
 677
 678 typedef struct drm_agp_buffer32 {
 679         u32 size;       /**< In bytes -- will round to page boundary */
 680         u32 handle;     /**< Used for binding / unbinding */
 681         u32 type;       /**< Type of memory to allocate */
 682         u32 physical;   /**< Physical used by i810 */
 683 } drm_agp_buffer32_t;
 684
 685 static int compat_drm_agp_alloc(struct file *file, unsigned int cmd,
 686                                 unsigned long arg)
 687 {
 688         drm_agp_buffer32_t __user *argp = (void __user *)arg;
 689         drm_agp_buffer32_t req32;
 690         struct drm_agp_buffer request;
 691         int err;
 692
 693         if (copy_from_user(&req32, argp, sizeof(req32)))
 694                 return -EFAULT;
 695
 696         request.size = req32.size;
 697         request.type = req32.type;
 698         err = drm_ioctl_kernel(file, drm_agp_alloc_ioctl, &request,
 699                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 700         if (err)
 701                 return err;
 702
 703         req32.handle = request.handle;
 704         req32.physical = request.physical;
 705         if (copy_to_user(argp, &req32, sizeof(req32))) {
 706                 drm_ioctl_kernel(file, drm_agp_free_ioctl, &request,
 707                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 708                 return -EFAULT;
 709         }
 710
 711         return 0;
 712 }
 713
 714 static int compat_drm_agp_free(struct file *file, unsigned int cmd,
 715                                unsigned long arg)
 716 {
 717         drm_agp_buffer32_t __user *argp = (void __user *)arg;
 718         struct drm_agp_buffer request;
 719
 720         if (get_user(request.handle, &argp->handle))
 721                 return -EFAULT;
 722
 723         return drm_ioctl_kernel(file, drm_agp_free_ioctl, &request,
 724                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 725 }
 726
 727 typedef struct drm_agp_binding32 {
 728         u32 handle;     /**< From drm_agp_buffer */
 729         u32 offset;     /**< In bytes -- will round to page boundary */
 730 } drm_agp_binding32_t;
 731
 732 static int compat_drm_agp_bind(struct file *file, unsigned int cmd,
 733                                unsigned long arg)
 734 {
 735         drm_agp_binding32_t __user *argp = (void __user *)arg;
 736         drm_agp_binding32_t req32;
 737         struct drm_agp_binding request;
 738
 739         if (copy_from_user(&req32, argp, sizeof(req32)))
 740                 return -EFAULT;
 741
 742         request.handle = req32.handle;
 743         request.offset = req32.offset;
 744         return drm_ioctl_kernel(file, drm_agp_bind_ioctl, &request,
 745                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 746 }
 747
 748 static int compat_drm_agp_unbind(struct file *file, unsigned int cmd,
 749                                  unsigned long arg)
 750 {
 751         drm_agp_binding32_t __user *argp = (void __user *)arg;
 752         struct drm_agp_binding request;
 753
 754         if (get_user(request.handle, &argp->handle))
 755                 return -EFAULT;
 756
 757         return drm_ioctl_kernel(file, drm_agp_unbind_ioctl, &request,
 758                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 759 }
 760 #endif /* CONFIG_AGP */
 761
 762 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 763 typedef struct drm_scatter_gather32 {
 764         u32 size;       /**< In bytes -- will round to page boundary */
 765         u32 handle;     /**< Used for mapping / unmapping */
 766 } drm_scatter_gather32_t;
 767
 768 static int compat_drm_sg_alloc(struct file *file, unsigned int cmd,
 769                                unsigned long arg)
 770 {
 771         drm_scatter_gather32_t __user *argp = (void __user *)arg;
 772         struct drm_scatter_gather request;
 773         int err;
 774
 775         if (get_user(request.size, &argp->size))
 776                 return -EFAULT;
 777
 778         err = drm_ioctl_kernel(file, drm_legacy_sg_alloc, &request,
 779                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 780         if (err)
 781                 return err;
 782
 783         /* XXX not sure about the handle conversion here... */
 784         if (put_user(request.handle >> PAGE_SHIFT, &argp->handle))
 785                 return -EFAULT;
 786
 787         return 0;
 788 }
 789
 790 static int compat_drm_sg_free(struct file *file, unsigned int cmd,
 791                               unsigned long arg)
 792 {
 793         drm_scatter_gather32_t __user *argp = (void __user *)arg;
 794         struct drm_scatter_gather request;
 795         unsigned long x;
 796
 797         if (get_user(x, &argp->handle))
 798                 return -EFAULT;
 799         request.handle = x << PAGE_SHIFT;
 800         return drm_ioctl_kernel(file, drm_legacy_sg_free, &request,
 801                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 802 }
 803 #endif
 804 #if defined(CONFIG_X86)
 805 typedef struct drm_update_draw32 {
 806         drm_drawable_t handle;
 807         unsigned int type;
 808         unsigned int num;
 809         /* 64-bit version has a 32-bit pad here */
 810         u64 data;       /**< Pointer */
 811 } __attribute__((packed)) drm_update_draw32_t;
 812
 813 static int compat_drm_update_draw(struct file *file, unsigned int cmd,
 814                                   unsigned long arg)
 815 {
 816         drm_update_draw32_t update32;
 817
 818         if (copy_from_user(&update32, (void __user *)arg, sizeof(update32)))
 819                 return -EFAULT;
 820
 821         return drm_ioctl_kernel(file, drm_noop, NULL,
 822                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 823 }
 824 #endif
 825
 826 struct drm_wait_vblank_request32 {
 827         enum drm_vblank_seq_type type;
 828         unsigned int sequence;
 829         u32 signal;
 830 };
 831
 832 struct drm_wait_vblank_reply32 {
 833         enum drm_vblank_seq_type type;
 834         unsigned int sequence;
 835         s32 tval_sec;
 836         s32 tval_usec;
 837 };
 838
 839 typedef union drm_wait_vblank32 {
 840         struct drm_wait_vblank_request32 request;
 841         struct drm_wait_vblank_reply32 reply;
 842 } drm_wait_vblank32_t;
 843
 844 static int compat_drm_wait_vblank(struct file *file, unsigned int cmd,
 845                                   unsigned long arg)
 846 {
 847         drm_wait_vblank32_t __user *argp = (void __user *)arg;
 848         drm_wait_vblank32_t req32;
 849         union drm_wait_vblank req;
 850         int err;
 851
 852         if (copy_from_user(&req32, argp, sizeof(req32)))
 853                 return -EFAULT;
 854
 855         req.request.type = req32.request.type;
 856         req.request.sequence = req32.request.sequence;
 857         req.request.signal = req32.request.signal;
 858         err = drm_ioctl_kernel(file, drm_wait_vblank_ioctl, &req, DRM_UNLOCKED);
 859         if (err)
 860                 return err;
 861
 862         req32.reply.type = req.reply.type;
 863         req32.reply.sequence = req.reply.sequence;
 864         req32.reply.tval_sec = req.reply.tval_sec;
 865         req32.reply.tval_usec = req.reply.tval_usec;
 866         if (copy_to_user(argp, &req32, sizeof(req32)))
 867                 return -EFAULT;
 868
 869         return 0;
 870 }
 871
 872 #if defined(CONFIG_X86)
 873 typedef struct drm_mode_fb_cmd232 {
 874         u32 fb_id;
 875         u32 width;
 876         u32 height;
 877         u32 pixel_format;
 878         u32 flags;
 879         u32 handles[4];
 880         u32 pitches[4];
 881         u32 offsets[4];
 882         u64 modifier[4];
 883 } __attribute__((packed)) drm_mode_fb_cmd232_t;
 884
 885 static int compat_drm_mode_addfb2(struct file *file, unsigned int cmd,
 886                                   unsigned long arg)
 887 {
 888         struct drm_mode_fb_cmd232 __user *argp = (void __user *)arg;
 889         struct drm_mode_fb_cmd2 req64;
 890         int err;
 891
 892         if (copy_from_user(&req64, argp,
 893                            offsetof(drm_mode_fb_cmd232_t, modifier)))
 894                 return -EFAULT;
 895
 896         if (copy_from_user(&req64.modifier, &argp->modifier,
 897                            sizeof(req64.modifier)))
 898                 return -EFAULT;
 899
 900         err = drm_ioctl_kernel(file, drm_mode_addfb2, &req64, 0);
 901         if (err)
 902                 return err;
 903
 904         if (put_user(req64.fb_id, &argp->fb_id))
 905                 return -EFAULT;
 906
 907         return 0;
 908 }
 909 #endif
 910
 911 static struct {
 912         drm_ioctl_compat_t *fn;
 913         char *name;
 914 } drm_compat_ioctls[] = {
 915 #define DRM_IOCTL32_DEF(n, f) [DRM_IOCTL_NR(n##32)] = {.fn = f, .name = #n}
 916         DRM_IOCTL32_DEF(DRM_IOCTL_VERSION, compat_drm_version),
 917         DRM_IOCTL32_DEF(DRM_IOCTL_GET_UNIQUE, compat_drm_getunique),
 918 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 919         DRM_IOCTL32_DEF(DRM_IOCTL_GET_MAP, compat_drm_getmap),
 920 #endif
 921         DRM_IOCTL32_DEF(DRM_IOCTL_GET_CLIENT, compat_drm_getclient),
 922         DRM_IOCTL32_DEF(DRM_IOCTL_GET_STATS, compat_drm_getstats),
 923         DRM_IOCTL32_DEF(DRM_IOCTL_SET_UNIQUE, compat_drm_setunique),
 924 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 925         DRM_IOCTL32_DEF(DRM_IOCTL_ADD_MAP, compat_drm_addmap),
 926         DRM_IOCTL32_DEF(DRM_IOCTL_ADD_BUFS, compat_drm_addbufs),
 927         DRM_IOCTL32_DEF(DRM_IOCTL_MARK_BUFS, compat_drm_markbufs),
 928         DRM_IOCTL32_DEF(DRM_IOCTL_INFO_BUFS, compat_drm_infobufs),
 929         DRM_IOCTL32_DEF(DRM_IOCTL_MAP_BUFS, compat_drm_mapbufs),
 930         DRM_IOCTL32_DEF(DRM_IOCTL_FREE_BUFS, compat_drm_freebufs),
 931         DRM_IOCTL32_DEF(DRM_IOCTL_RM_MAP, compat_drm_rmmap),
 932         DRM_IOCTL32_DEF(DRM_IOCTL_SET_SAREA_CTX, compat_drm_setsareactx),
 933         DRM_IOCTL32_DEF(DRM_IOCTL_GET_SAREA_CTX, compat_drm_getsareactx),
 934         DRM_IOCTL32_DEF(DRM_IOCTL_RES_CTX, compat_drm_resctx),
 935         DRM_IOCTL32_DEF(DRM_IOCTL_DMA, compat_drm_dma),
 936 #endif
 937 #if IS_ENABLED(CONFIG_AGP)
 938         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_ENABLE, compat_drm_agp_enable),
 939         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_INFO, compat_drm_agp_info),
 940         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_ALLOC, compat_drm_agp_alloc),
 941         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_FREE, compat_drm_agp_free),
 942         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_BIND, compat_drm_agp_bind),
 943         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_UNBIND, compat_drm_agp_unbind),
 944 #endif
 945 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 946         DRM_IOCTL32_DEF(DRM_IOCTL_SG_ALLOC, compat_drm_sg_alloc),
 947         DRM_IOCTL32_DEF(DRM_IOCTL_SG_FREE, compat_drm_sg_free),
 948 #endif
 949 #if defined(CONFIG_X86) || defined(CONFIG_IA64)
 950         DRM_IOCTL32_DEF(DRM_IOCTL_UPDATE_DRAW, compat_drm_update_draw),
 951 #endif
 952         DRM_IOCTL32_DEF(DRM_IOCTL_WAIT_VBLANK, compat_drm_wait_vblank),
 953 #if defined(CONFIG_X86) || defined(CONFIG_IA64)
 954         DRM_IOCTL32_DEF(DRM_IOCTL_MODE_ADDFB2, compat_drm_mode_addfb2),
 955 #endif
 956 };
 957
 958 /**
 959  * drm_compat_ioctl - 32bit IOCTL compatibility handler for DRM drivers
 960  * @filp: file this ioctl is called on
 961  * @cmd: ioctl cmd number
 962  * @arg: user argument
 963  *
 964  * Compatibility handler for 32 bit userspace running on 64 kernels. All actual
 965  * IOCTL handling is forwarded to drm_ioctl(), while marshalling structures as
 966  * appropriate. Note that this only handles DRM core IOCTLs, if the driver has
 967  * botched IOCTL itself, it must handle those by wrapping this function.
 968  *
 969  * Returns:
 970  * Zero on success, negative error code on failure.
 971  */
 972 long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 973 {
 974         unsigned int nr = DRM_IOCTL_NR(cmd);
 975         struct drm_file *file_priv = filp->private_data;
 976         drm_ioctl_compat_t *fn;
 977         int ret;
 978
 979         /* Assume that ioctls without an explicit compat routine will just
 980          * work.  This may not always be a good assumption, but it's better
 981          * than always failing.
 982          */
 983         if (nr >= ARRAY_SIZE(drm_compat_ioctls))
 984                 return drm_ioctl(filp, cmd, arg);
 985
 986         fn = drm_compat_ioctls[nr].fn;
 987         if (!fn)
 988                 return drm_ioctl(filp, cmd, arg);
 989
 990         DRM_DEBUG("comm=\"%s\", pid=%d, dev=0x%lx, auth=%d, %s\n",
 991                   current->comm, task_pid_nr(current),
 992                   (long)old_encode_dev(file_priv->minor->kdev->devt),
 993                   file_priv->authenticated,
 994                   drm_compat_ioctls[nr].name);
 995         ret = (*fn)(filp, cmd, arg);
 996         if (ret)
 997                 DRM_DEBUG("ret = %d\n", ret);
 998         return ret;
 999 }
1000 EXPORT_SYMBOL(drm_compat_ioctl);