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         memset(&v, 0, sizeof(v));
 103
 104         v = (struct drm_version) {
 105                 .name_len = v32.name_len,
 106                 .name = compat_ptr(v32.name),
 107                 .date_len = v32.date_len,
 108                 .date = compat_ptr(v32.date),
 109                 .desc_len = v32.desc_len,
 110                 .desc = compat_ptr(v32.desc),
 111         };
 112         err = drm_ioctl_kernel(file, drm_version, &v,
 113                                DRM_RENDER_ALLOW);
 114         if (err)
 115                 return err;
 116
 117         v32.version_major = v.version_major;
 118         v32.version_minor = v.version_minor;
 119         v32.version_patchlevel = v.version_patchlevel;
 120         v32.name_len = v.name_len;
 121         v32.date_len = v.date_len;
 122         v32.desc_len = v.desc_len;
 123         if (copy_to_user((void __user *)arg, &v32, sizeof(v32)))
 124                 return -EFAULT;
 125         return 0;
 126 }
 127
 128 typedef struct drm_unique32 {
 129         u32 unique_len; /* Length of unique */
 130         u32 unique;     /* Unique name for driver instantiation */
 131 } drm_unique32_t;
 132
 133 static int compat_drm_getunique(struct file *file, unsigned int cmd,
 134                                 unsigned long arg)
 135 {
 136         drm_unique32_t uq32;
 137         struct drm_unique uq;
 138         int err;
 139
 140         if (copy_from_user(&uq32, (void __user *)arg, sizeof(uq32)))
 141                 return -EFAULT;
 142
 143         memset(&uq, 0, sizeof(uq));
 144
 145         uq = (struct drm_unique){
 146                 .unique_len = uq32.unique_len,
 147                 .unique = compat_ptr(uq32.unique),
 148         };
 149
 150         err = drm_ioctl_kernel(file, drm_getunique, &uq, 0);
 151         if (err)
 152                 return err;
 153
 154         uq32.unique_len = uq.unique_len;
 155         if (copy_to_user((void __user *)arg, &uq32, sizeof(uq32)))
 156                 return -EFAULT;
 157         return 0;
 158 }
 159
 160 static int compat_drm_setunique(struct file *file, unsigned int cmd,
 161                                 unsigned long arg)
 162 {
 163         /* it's dead */
 164         return -EINVAL;
 165 }
 166
 167 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 168 typedef struct drm_map32 {
 169         u32 offset;             /* Requested physical address (0 for SAREA) */
 170         u32 size;               /* Requested physical size (bytes) */
 171         enum drm_map_type type; /* Type of memory to map */
 172         enum drm_map_flags flags;       /* Flags */
 173         u32 handle;             /* User-space: "Handle" to pass to mmap() */
 174         int mtrr;               /* MTRR slot used */
 175 } drm_map32_t;
 176
 177 static int compat_drm_getmap(struct file *file, unsigned int cmd,
 178                              unsigned long arg)
 179 {
 180         drm_map32_t __user *argp = (void __user *)arg;
 181         drm_map32_t m32;
 182         struct drm_map map;
 183         int err;
 184
 185         if (copy_from_user(&m32, argp, sizeof(m32)))
 186                 return -EFAULT;
 187
 188         map.offset = m32.offset;
 189         err = drm_ioctl_kernel(file, drm_legacy_getmap_ioctl, &map, 0);
 190         if (err)
 191                 return err;
 192
 193         m32.offset = map.offset;
 194         m32.size = map.size;
 195         m32.type = map.type;
 196         m32.flags = map.flags;
 197         m32.handle = ptr_to_compat((void __user *)map.handle);
 198         m32.mtrr = map.mtrr;
 199         if (copy_to_user(argp, &m32, sizeof(m32)))
 200                 return -EFAULT;
 201         return 0;
 202
 203 }
 204
 205 static int compat_drm_addmap(struct file *file, unsigned int cmd,
 206                              unsigned long arg)
 207 {
 208         drm_map32_t __user *argp = (void __user *)arg;
 209         drm_map32_t m32;
 210         struct drm_map map;
 211         int err;
 212
 213         if (copy_from_user(&m32, argp, sizeof(m32)))
 214                 return -EFAULT;
 215
 216         map.offset = m32.offset;
 217         map.size = m32.size;
 218         map.type = m32.type;
 219         map.flags = m32.flags;
 220
 221         err = drm_ioctl_kernel(file, drm_legacy_addmap_ioctl, &map,
 222                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 223         if (err)
 224                 return err;
 225
 226         m32.offset = map.offset;
 227         m32.mtrr = map.mtrr;
 228         m32.handle = ptr_to_compat((void __user *)map.handle);
 229         if (map.handle != compat_ptr(m32.handle))
 230                 pr_err_ratelimited("compat_drm_addmap truncated handle %p for type %d offset %x\n",
 231                                    map.handle, m32.type, m32.offset);
 232
 233         if (copy_to_user(argp, &m32, sizeof(m32)))
 234                 return -EFAULT;
 235
 236         return 0;
 237 }
 238
 239 static int compat_drm_rmmap(struct file *file, unsigned int cmd,
 240                             unsigned long arg)
 241 {
 242         drm_map32_t __user *argp = (void __user *)arg;
 243         struct drm_map map;
 244         u32 handle;
 245
 246         if (get_user(handle, &argp->handle))
 247                 return -EFAULT;
 248         map.handle = compat_ptr(handle);
 249         return drm_ioctl_kernel(file, drm_legacy_rmmap_ioctl, &map, DRM_AUTH);
 250 }
 251 #endif
 252
 253 typedef struct drm_client32 {
 254         int idx;        /* Which client desired? */
 255         int auth;       /* Is client authenticated? */
 256         u32 pid;        /* Process ID */
 257         u32 uid;        /* User ID */
 258         u32 magic;      /* Magic */
 259         u32 iocs;       /* Ioctl count */
 260 } drm_client32_t;
 261
 262 static int compat_drm_getclient(struct file *file, unsigned int cmd,
 263                                 unsigned long arg)
 264 {
 265         drm_client32_t c32;
 266         drm_client32_t __user *argp = (void __user *)arg;
 267         struct drm_client client;
 268         int err;
 269
 270         if (copy_from_user(&c32, argp, sizeof(c32)))
 271                 return -EFAULT;
 272
 273         memset(&client, 0, sizeof(client));
 274
 275         client.idx = c32.idx;
 276
 277         err = drm_ioctl_kernel(file, drm_getclient, &client, 0);
 278         if (err)
 279                 return err;
 280
 281         c32.idx = client.idx;
 282         c32.auth = client.auth;
 283         c32.pid = client.pid;
 284         c32.uid = client.uid;
 285         c32.magic = client.magic;
 286         c32.iocs = client.iocs;
 287
 288         if (copy_to_user(argp, &c32, sizeof(c32)))
 289                 return -EFAULT;
 290         return 0;
 291 }
 292
 293 typedef struct drm_stats32 {
 294         u32 count;
 295         struct {
 296                 u32 value;
 297                 enum drm_stat_type type;
 298         } data[15];
 299 } drm_stats32_t;
 300
 301 static int compat_drm_getstats(struct file *file, unsigned int cmd,
 302                                unsigned long arg)
 303 {
 304         drm_stats32_t __user *argp = (void __user *)arg;
 305         int err;
 306
 307         err = drm_ioctl_kernel(file, drm_noop, NULL, 0);
 308         if (err)
 309                 return err;
 310
 311         if (clear_user(argp, sizeof(drm_stats32_t)))
 312                 return -EFAULT;
 313         return 0;
 314 }
 315
 316 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 317 typedef struct drm_buf_desc32 {
 318         int count;               /* Number of buffers of this size */
 319         int size;                /* Size in bytes */
 320         int low_mark;            /* Low water mark */
 321         int high_mark;           /* High water mark */
 322         int flags;
 323         u32 agp_start;           /* Start address in the AGP aperture */
 324 } drm_buf_desc32_t;
 325
 326 static int compat_drm_addbufs(struct file *file, unsigned int cmd,
 327                               unsigned long arg)
 328 {
 329         drm_buf_desc32_t __user *argp = (void __user *)arg;
 330         drm_buf_desc32_t desc32;
 331         struct drm_buf_desc desc;
 332         int err;
 333
 334         if (copy_from_user(&desc32, argp, sizeof(drm_buf_desc32_t)))
 335                 return -EFAULT;
 336
 337         desc = (struct drm_buf_desc){
 338                 desc32.count, desc32.size, desc32.low_mark, desc32.high_mark,
 339                 desc32.flags, desc32.agp_start
 340         };
 341
 342         err = drm_ioctl_kernel(file, drm_legacy_addbufs, &desc,
 343                                    DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 344         if (err)
 345                 return err;
 346
 347         desc32 = (drm_buf_desc32_t){
 348                 desc.count, desc.size, desc.low_mark, desc.high_mark,
 349                 desc.flags, desc.agp_start
 350         };
 351         if (copy_to_user(argp, &desc32, sizeof(drm_buf_desc32_t)))
 352                 return -EFAULT;
 353
 354         return 0;
 355 }
 356
 357 static int compat_drm_markbufs(struct file *file, unsigned int cmd,
 358                                unsigned long arg)
 359 {
 360         drm_buf_desc32_t b32;
 361         drm_buf_desc32_t __user *argp = (void __user *)arg;
 362         struct drm_buf_desc buf;
 363
 364         if (copy_from_user(&b32, argp, sizeof(b32)))
 365                 return -EFAULT;
 366
 367         buf.size = b32.size;
 368         buf.low_mark = b32.low_mark;
 369         buf.high_mark = b32.high_mark;
 370
 371         return drm_ioctl_kernel(file, drm_legacy_markbufs, &buf,
 372                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 373 }
 374
 375 typedef struct drm_buf_info32 {
 376         int count;              /**< Entries in list */
 377         u32 list;
 378 } drm_buf_info32_t;
 379
 380 static int copy_one_buf32(void *data, int count, struct drm_buf_entry *from)
 381 {
 382         drm_buf_info32_t *request = data;
 383         drm_buf_desc32_t __user *to = compat_ptr(request->list);
 384         drm_buf_desc32_t v = {.count = from->buf_count,
 385                               .size = from->buf_size,
 386                               .low_mark = from->low_mark,
 387                               .high_mark = from->high_mark};
 388
 389         if (copy_to_user(to + count, &v, offsetof(drm_buf_desc32_t, flags)))
 390                 return -EFAULT;
 391         return 0;
 392 }
 393
 394 static int drm_legacy_infobufs32(struct drm_device *dev, void *data,
 395                         struct drm_file *file_priv)
 396 {
 397         drm_buf_info32_t *request = data;
 398
 399         return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf32);
 400 }
 401
 402 static int compat_drm_infobufs(struct file *file, unsigned int cmd,
 403                                unsigned long arg)
 404 {
 405         drm_buf_info32_t req32;
 406         drm_buf_info32_t __user *argp = (void __user *)arg;
 407         int err;
 408
 409         if (copy_from_user(&req32, argp, sizeof(req32)))
 410                 return -EFAULT;
 411
 412         if (req32.count < 0)
 413                 req32.count = 0;
 414
 415         err = drm_ioctl_kernel(file, drm_legacy_infobufs32, &req32, DRM_AUTH);
 416         if (err)
 417                 return err;
 418
 419         if (put_user(req32.count, &argp->count))
 420                 return -EFAULT;
 421
 422         return 0;
 423 }
 424
 425 typedef struct drm_buf_pub32 {
 426         int idx;                /**< Index into the master buffer list */
 427         int total;              /**< Buffer size */
 428         int used;               /**< Amount of buffer in use (for DMA) */
 429         u32 address;            /**< Address of buffer */
 430 } drm_buf_pub32_t;
 431
 432 typedef struct drm_buf_map32 {
 433         int count;              /**< Length of the buffer list */
 434         u32 virtual;            /**< Mmap'd area in user-virtual */
 435         u32 list;               /**< Buffer information */
 436 } drm_buf_map32_t;
 437
 438 static int map_one_buf32(void *data, int idx, unsigned long virtual,
 439                         struct drm_buf *buf)
 440 {
 441         drm_buf_map32_t *request = data;
 442         drm_buf_pub32_t __user *to = compat_ptr(request->list) + idx;
 443         drm_buf_pub32_t v;
 444
 445         v.idx = buf->idx;
 446         v.total = buf->total;
 447         v.used = 0;
 448         v.address = virtual + buf->offset;
 449         if (copy_to_user(to, &v, sizeof(v)))
 450                 return -EFAULT;
 451         return 0;
 452 }
 453
 454 static int drm_legacy_mapbufs32(struct drm_device *dev, void *data,
 455                        struct drm_file *file_priv)
 456 {
 457         drm_buf_map32_t *request = data;
 458         void __user *v;
 459         int err = __drm_legacy_mapbufs(dev, data, &request->count,
 460                                     &v, map_one_buf32,
 461                                     file_priv);
 462         request->virtual = ptr_to_compat(v);
 463         return err;
 464 }
 465
 466 static int compat_drm_mapbufs(struct file *file, unsigned int cmd,
 467                               unsigned long arg)
 468 {
 469         drm_buf_map32_t __user *argp = (void __user *)arg;
 470         drm_buf_map32_t req32;
 471         int err;
 472
 473         if (copy_from_user(&req32, argp, sizeof(req32)))
 474                 return -EFAULT;
 475         if (req32.count < 0)
 476                 return -EINVAL;
 477
 478         err = drm_ioctl_kernel(file, drm_legacy_mapbufs32, &req32, DRM_AUTH);
 479         if (err)
 480                 return err;
 481
 482         if (put_user(req32.count, &argp->count)
 483             || put_user(req32.virtual, &argp->virtual))
 484                 return -EFAULT;
 485
 486         return 0;
 487 }
 488
 489 typedef struct drm_buf_free32 {
 490         int count;
 491         u32 list;
 492 } drm_buf_free32_t;
 493
 494 static int compat_drm_freebufs(struct file *file, unsigned int cmd,
 495                                unsigned long arg)
 496 {
 497         drm_buf_free32_t req32;
 498         struct drm_buf_free request;
 499         drm_buf_free32_t __user *argp = (void __user *)arg;
 500
 501         if (copy_from_user(&req32, argp, sizeof(req32)))
 502                 return -EFAULT;
 503
 504         request.count = req32.count;
 505         request.list = compat_ptr(req32.list);
 506         return drm_ioctl_kernel(file, drm_legacy_freebufs, &request, DRM_AUTH);
 507 }
 508
 509 typedef struct drm_ctx_priv_map32 {
 510         unsigned int ctx_id;     /**< Context requesting private mapping */
 511         u32 handle;             /**< Handle of map */
 512 } drm_ctx_priv_map32_t;
 513
 514 static int compat_drm_setsareactx(struct file *file, unsigned int cmd,
 515                                   unsigned long arg)
 516 {
 517         drm_ctx_priv_map32_t req32;
 518         struct drm_ctx_priv_map request;
 519         drm_ctx_priv_map32_t __user *argp = (void __user *)arg;
 520
 521         if (copy_from_user(&req32, argp, sizeof(req32)))
 522                 return -EFAULT;
 523
 524         request.ctx_id = req32.ctx_id;
 525         request.handle = compat_ptr(req32.handle);
 526         return drm_ioctl_kernel(file, drm_legacy_setsareactx, &request,
 527                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 528 }
 529
 530 static int compat_drm_getsareactx(struct file *file, unsigned int cmd,
 531                                   unsigned long arg)
 532 {
 533         struct drm_ctx_priv_map req;
 534         drm_ctx_priv_map32_t req32;
 535         drm_ctx_priv_map32_t __user *argp = (void __user *)arg;
 536         int err;
 537
 538         if (copy_from_user(&req32, argp, sizeof(req32)))
 539                 return -EFAULT;
 540
 541         req.ctx_id = req32.ctx_id;
 542         err = drm_ioctl_kernel(file, drm_legacy_getsareactx, &req, DRM_AUTH);
 543         if (err)
 544                 return err;
 545
 546         req32.handle = ptr_to_compat((void __user *)req.handle);
 547         if (copy_to_user(argp, &req32, sizeof(req32)))
 548                 return -EFAULT;
 549
 550         return 0;
 551 }
 552
 553 typedef struct drm_ctx_res32 {
 554         int count;
 555         u32 contexts;
 556 } drm_ctx_res32_t;
 557
 558 static int compat_drm_resctx(struct file *file, unsigned int cmd,
 559                              unsigned long arg)
 560 {
 561         drm_ctx_res32_t __user *argp = (void __user *)arg;
 562         drm_ctx_res32_t res32;
 563         struct drm_ctx_res res;
 564         int err;
 565
 566         if (copy_from_user(&res32, argp, sizeof(res32)))
 567                 return -EFAULT;
 568
 569         res.count = res32.count;
 570         res.contexts = compat_ptr(res32.contexts);
 571         err = drm_ioctl_kernel(file, drm_legacy_resctx, &res, DRM_AUTH);
 572         if (err)
 573                 return err;
 574
 575         res32.count = res.count;
 576         if (copy_to_user(argp, &res32, sizeof(res32)))
 577                 return -EFAULT;
 578
 579         return 0;
 580 }
 581
 582 typedef struct drm_dma32 {
 583         int context;              /**< Context handle */
 584         int send_count;           /**< Number of buffers to send */
 585         u32 send_indices;         /**< List of handles to buffers */
 586         u32 send_sizes;           /**< Lengths of data to send */
 587         enum drm_dma_flags flags;                 /**< Flags */
 588         int request_count;        /**< Number of buffers requested */
 589         int request_size;         /**< Desired size for buffers */
 590         u32 request_indices;      /**< Buffer information */
 591         u32 request_sizes;
 592         int granted_count;        /**< Number of buffers granted */
 593 } drm_dma32_t;
 594
 595 static int compat_drm_dma(struct file *file, unsigned int cmd,
 596                           unsigned long arg)
 597 {
 598         drm_dma32_t d32;
 599         drm_dma32_t __user *argp = (void __user *)arg;
 600         struct drm_dma d;
 601         int err;
 602
 603         if (copy_from_user(&d32, argp, sizeof(d32)))
 604                 return -EFAULT;
 605
 606         d.context = d32.context;
 607         d.send_count = d32.send_count;
 608         d.send_indices = compat_ptr(d32.send_indices);
 609         d.send_sizes = compat_ptr(d32.send_sizes);
 610         d.flags = d32.flags;
 611         d.request_count = d32.request_count;
 612         d.request_indices = compat_ptr(d32.request_indices);
 613         d.request_sizes = compat_ptr(d32.request_sizes);
 614         err = drm_ioctl_kernel(file, drm_legacy_dma_ioctl, &d, DRM_AUTH);
 615         if (err)
 616                 return err;
 617
 618         if (put_user(d.request_size, &argp->request_size)
 619             || put_user(d.granted_count, &argp->granted_count))
 620                 return -EFAULT;
 621
 622         return 0;
 623 }
 624 #endif
 625
 626 #if IS_ENABLED(CONFIG_AGP)
 627 typedef struct drm_agp_mode32 {
 628         u32 mode;       /**< AGP mode */
 629 } drm_agp_mode32_t;
 630
 631 static int compat_drm_agp_enable(struct file *file, unsigned int cmd,
 632                                  unsigned long arg)
 633 {
 634         drm_agp_mode32_t __user *argp = (void __user *)arg;
 635         struct drm_agp_mode mode;
 636
 637         if (get_user(mode.mode, &argp->mode))
 638                 return -EFAULT;
 639
 640         return drm_ioctl_kernel(file,  drm_agp_enable_ioctl, &mode,
 641                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 642 }
 643
 644 typedef struct drm_agp_info32 {
 645         int agp_version_major;
 646         int agp_version_minor;
 647         u32 mode;
 648         u32 aperture_base;      /* physical address */
 649         u32 aperture_size;      /* bytes */
 650         u32 memory_allowed;     /* bytes */
 651         u32 memory_used;
 652
 653         /* PCI information */
 654         unsigned short id_vendor;
 655         unsigned short id_device;
 656 } drm_agp_info32_t;
 657
 658 static int compat_drm_agp_info(struct file *file, unsigned int cmd,
 659                                unsigned long arg)
 660 {
 661         drm_agp_info32_t __user *argp = (void __user *)arg;
 662         drm_agp_info32_t i32;
 663         struct drm_agp_info info;
 664         int err;
 665
 666         err = drm_ioctl_kernel(file, drm_agp_info_ioctl, &info, DRM_AUTH);
 667         if (err)
 668                 return err;
 669
 670         i32.agp_version_major = info.agp_version_major;
 671         i32.agp_version_minor = info.agp_version_minor;
 672         i32.mode = info.mode;
 673         i32.aperture_base = info.aperture_base;
 674         i32.aperture_size = info.aperture_size;
 675         i32.memory_allowed = info.memory_allowed;
 676         i32.memory_used = info.memory_used;
 677         i32.id_vendor = info.id_vendor;
 678         i32.id_device = info.id_device;
 679         if (copy_to_user(argp, &i32, sizeof(i32)))
 680                 return -EFAULT;
 681
 682         return 0;
 683 }
 684
 685 typedef struct drm_agp_buffer32 {
 686         u32 size;       /**< In bytes -- will round to page boundary */
 687         u32 handle;     /**< Used for binding / unbinding */
 688         u32 type;       /**< Type of memory to allocate */
 689         u32 physical;   /**< Physical used by i810 */
 690 } drm_agp_buffer32_t;
 691
 692 static int compat_drm_agp_alloc(struct file *file, unsigned int cmd,
 693                                 unsigned long arg)
 694 {
 695         drm_agp_buffer32_t __user *argp = (void __user *)arg;
 696         drm_agp_buffer32_t req32;
 697         struct drm_agp_buffer request;
 698         int err;
 699
 700         if (copy_from_user(&req32, argp, sizeof(req32)))
 701                 return -EFAULT;
 702
 703         request.size = req32.size;
 704         request.type = req32.type;
 705         err = drm_ioctl_kernel(file, drm_agp_alloc_ioctl, &request,
 706                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 707         if (err)
 708                 return err;
 709
 710         req32.handle = request.handle;
 711         req32.physical = request.physical;
 712         if (copy_to_user(argp, &req32, sizeof(req32))) {
 713                 drm_ioctl_kernel(file, drm_agp_free_ioctl, &request,
 714                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 715                 return -EFAULT;
 716         }
 717
 718         return 0;
 719 }
 720
 721 static int compat_drm_agp_free(struct file *file, unsigned int cmd,
 722                                unsigned long arg)
 723 {
 724         drm_agp_buffer32_t __user *argp = (void __user *)arg;
 725         struct drm_agp_buffer request;
 726
 727         if (get_user(request.handle, &argp->handle))
 728                 return -EFAULT;
 729
 730         return drm_ioctl_kernel(file, drm_agp_free_ioctl, &request,
 731                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 732 }
 733
 734 typedef struct drm_agp_binding32 {
 735         u32 handle;     /**< From drm_agp_buffer */
 736         u32 offset;     /**< In bytes -- will round to page boundary */
 737 } drm_agp_binding32_t;
 738
 739 static int compat_drm_agp_bind(struct file *file, unsigned int cmd,
 740                                unsigned long arg)
 741 {
 742         drm_agp_binding32_t __user *argp = (void __user *)arg;
 743         drm_agp_binding32_t req32;
 744         struct drm_agp_binding request;
 745
 746         if (copy_from_user(&req32, argp, sizeof(req32)))
 747                 return -EFAULT;
 748
 749         request.handle = req32.handle;
 750         request.offset = req32.offset;
 751         return drm_ioctl_kernel(file, drm_agp_bind_ioctl, &request,
 752                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 753 }
 754
 755 static int compat_drm_agp_unbind(struct file *file, unsigned int cmd,
 756                                  unsigned long arg)
 757 {
 758         drm_agp_binding32_t __user *argp = (void __user *)arg;
 759         struct drm_agp_binding request;
 760
 761         if (get_user(request.handle, &argp->handle))
 762                 return -EFAULT;
 763
 764         return drm_ioctl_kernel(file, drm_agp_unbind_ioctl, &request,
 765                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 766 }
 767 #endif /* CONFIG_AGP */
 768
 769 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 770 typedef struct drm_scatter_gather32 {
 771         u32 size;       /**< In bytes -- will round to page boundary */
 772         u32 handle;     /**< Used for mapping / unmapping */
 773 } drm_scatter_gather32_t;
 774
 775 static int compat_drm_sg_alloc(struct file *file, unsigned int cmd,
 776                                unsigned long arg)
 777 {
 778         drm_scatter_gather32_t __user *argp = (void __user *)arg;
 779         struct drm_scatter_gather request;
 780         int err;
 781
 782         if (get_user(request.size, &argp->size))
 783                 return -EFAULT;
 784
 785         err = drm_ioctl_kernel(file, drm_legacy_sg_alloc, &request,
 786                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 787         if (err)
 788                 return err;
 789
 790         /* XXX not sure about the handle conversion here... */
 791         if (put_user(request.handle >> PAGE_SHIFT, &argp->handle))
 792                 return -EFAULT;
 793
 794         return 0;
 795 }
 796
 797 static int compat_drm_sg_free(struct file *file, unsigned int cmd,
 798                               unsigned long arg)
 799 {
 800         drm_scatter_gather32_t __user *argp = (void __user *)arg;
 801         struct drm_scatter_gather request;
 802         unsigned long x;
 803
 804         if (get_user(x, &argp->handle))
 805                 return -EFAULT;
 806         request.handle = x << PAGE_SHIFT;
 807         return drm_ioctl_kernel(file, drm_legacy_sg_free, &request,
 808                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 809 }
 810 #endif
 811 #if defined(CONFIG_X86)
 812 typedef struct drm_update_draw32 {
 813         drm_drawable_t handle;
 814         unsigned int type;
 815         unsigned int num;
 816         /* 64-bit version has a 32-bit pad here */
 817         u64 data;       /**< Pointer */
 818 } __attribute__((packed)) drm_update_draw32_t;
 819
 820 static int compat_drm_update_draw(struct file *file, unsigned int cmd,
 821                                   unsigned long arg)
 822 {
 823         drm_update_draw32_t update32;
 824
 825         if (copy_from_user(&update32, (void __user *)arg, sizeof(update32)))
 826                 return -EFAULT;
 827
 828         return drm_ioctl_kernel(file, drm_noop, NULL,
 829                                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 830 }
 831 #endif
 832
 833 struct drm_wait_vblank_request32 {
 834         enum drm_vblank_seq_type type;
 835         unsigned int sequence;
 836         u32 signal;
 837 };
 838
 839 struct drm_wait_vblank_reply32 {
 840         enum drm_vblank_seq_type type;
 841         unsigned int sequence;
 842         s32 tval_sec;
 843         s32 tval_usec;
 844 };
 845
 846 typedef union drm_wait_vblank32 {
 847         struct drm_wait_vblank_request32 request;
 848         struct drm_wait_vblank_reply32 reply;
 849 } drm_wait_vblank32_t;
 850
 851 static int compat_drm_wait_vblank(struct file *file, unsigned int cmd,
 852                                   unsigned long arg)
 853 {
 854         drm_wait_vblank32_t __user *argp = (void __user *)arg;
 855         drm_wait_vblank32_t req32;
 856         union drm_wait_vblank req;
 857         int err;
 858
 859         if (copy_from_user(&req32, argp, sizeof(req32)))
 860                 return -EFAULT;
 861
 862         memset(&req, 0, sizeof(req));
 863
 864         req.request.type = req32.request.type;
 865         req.request.sequence = req32.request.sequence;
 866         req.request.signal = req32.request.signal;
 867         err = drm_ioctl_kernel(file, drm_wait_vblank_ioctl, &req, DRM_UNLOCKED);
 868         if (err)
 869                 return err;
 870
 871         req32.reply.type = req.reply.type;
 872         req32.reply.sequence = req.reply.sequence;
 873         req32.reply.tval_sec = req.reply.tval_sec;
 874         req32.reply.tval_usec = req.reply.tval_usec;
 875         if (copy_to_user(argp, &req32, sizeof(req32)))
 876                 return -EFAULT;
 877
 878         return 0;
 879 }
 880
 881 #if defined(CONFIG_X86)
 882 typedef struct drm_mode_fb_cmd232 {
 883         u32 fb_id;
 884         u32 width;
 885         u32 height;
 886         u32 pixel_format;
 887         u32 flags;
 888         u32 handles[4];
 889         u32 pitches[4];
 890         u32 offsets[4];
 891         u64 modifier[4];
 892 } __attribute__((packed)) drm_mode_fb_cmd232_t;
 893
 894 static int compat_drm_mode_addfb2(struct file *file, unsigned int cmd,
 895                                   unsigned long arg)
 896 {
 897         struct drm_mode_fb_cmd232 __user *argp = (void __user *)arg;
 898         struct drm_mode_fb_cmd2 req64;
 899         int err;
 900
 901         memset(&req64, 0, sizeof(req64));
 902
 903         if (copy_from_user(&req64, argp,
 904                            offsetof(drm_mode_fb_cmd232_t, modifier)))
 905                 return -EFAULT;
 906
 907         if (copy_from_user(&req64.modifier, &argp->modifier,
 908                            sizeof(req64.modifier)))
 909                 return -EFAULT;
 910
 911         err = drm_ioctl_kernel(file, drm_mode_addfb2, &req64, 0);
 912         if (err)
 913                 return err;
 914
 915         if (put_user(req64.fb_id, &argp->fb_id))
 916                 return -EFAULT;
 917
 918         return 0;
 919 }
 920 #endif
 921
 922 static struct {
 923         drm_ioctl_compat_t *fn;
 924         char *name;
 925 } drm_compat_ioctls[] = {
 926 #define DRM_IOCTL32_DEF(n, f) [DRM_IOCTL_NR(n##32)] = {.fn = f, .name = #n}
 927         DRM_IOCTL32_DEF(DRM_IOCTL_VERSION, compat_drm_version),
 928         DRM_IOCTL32_DEF(DRM_IOCTL_GET_UNIQUE, compat_drm_getunique),
 929 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 930         DRM_IOCTL32_DEF(DRM_IOCTL_GET_MAP, compat_drm_getmap),
 931 #endif
 932         DRM_IOCTL32_DEF(DRM_IOCTL_GET_CLIENT, compat_drm_getclient),
 933         DRM_IOCTL32_DEF(DRM_IOCTL_GET_STATS, compat_drm_getstats),
 934         DRM_IOCTL32_DEF(DRM_IOCTL_SET_UNIQUE, compat_drm_setunique),
 935 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 936         DRM_IOCTL32_DEF(DRM_IOCTL_ADD_MAP, compat_drm_addmap),
 937         DRM_IOCTL32_DEF(DRM_IOCTL_ADD_BUFS, compat_drm_addbufs),
 938         DRM_IOCTL32_DEF(DRM_IOCTL_MARK_BUFS, compat_drm_markbufs),
 939         DRM_IOCTL32_DEF(DRM_IOCTL_INFO_BUFS, compat_drm_infobufs),
 940         DRM_IOCTL32_DEF(DRM_IOCTL_MAP_BUFS, compat_drm_mapbufs),
 941         DRM_IOCTL32_DEF(DRM_IOCTL_FREE_BUFS, compat_drm_freebufs),
 942         DRM_IOCTL32_DEF(DRM_IOCTL_RM_MAP, compat_drm_rmmap),
 943         DRM_IOCTL32_DEF(DRM_IOCTL_SET_SAREA_CTX, compat_drm_setsareactx),
 944         DRM_IOCTL32_DEF(DRM_IOCTL_GET_SAREA_CTX, compat_drm_getsareactx),
 945         DRM_IOCTL32_DEF(DRM_IOCTL_RES_CTX, compat_drm_resctx),
 946         DRM_IOCTL32_DEF(DRM_IOCTL_DMA, compat_drm_dma),
 947 #endif
 948 #if IS_ENABLED(CONFIG_AGP)
 949         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_ENABLE, compat_drm_agp_enable),
 950         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_INFO, compat_drm_agp_info),
 951         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_ALLOC, compat_drm_agp_alloc),
 952         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_FREE, compat_drm_agp_free),
 953         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_BIND, compat_drm_agp_bind),
 954         DRM_IOCTL32_DEF(DRM_IOCTL_AGP_UNBIND, compat_drm_agp_unbind),
 955 #endif
 956 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 957         DRM_IOCTL32_DEF(DRM_IOCTL_SG_ALLOC, compat_drm_sg_alloc),
 958         DRM_IOCTL32_DEF(DRM_IOCTL_SG_FREE, compat_drm_sg_free),
 959 #endif
 960 #if defined(CONFIG_X86) || defined(CONFIG_IA64)
 961         DRM_IOCTL32_DEF(DRM_IOCTL_UPDATE_DRAW, compat_drm_update_draw),
 962 #endif
 963         DRM_IOCTL32_DEF(DRM_IOCTL_WAIT_VBLANK, compat_drm_wait_vblank),
 964 #if defined(CONFIG_X86) || defined(CONFIG_IA64)
 965         DRM_IOCTL32_DEF(DRM_IOCTL_MODE_ADDFB2, compat_drm_mode_addfb2),
 966 #endif
 967 };
 968
 969 /**
 970  * drm_compat_ioctl - 32bit IOCTL compatibility handler for DRM drivers
 971  * @filp: file this ioctl is called on
 972  * @cmd: ioctl cmd number
 973  * @arg: user argument
 974  *
 975  * Compatibility handler for 32 bit userspace running on 64 kernels. All actual
 976  * IOCTL handling is forwarded to drm_ioctl(), while marshalling structures as
 977  * appropriate. Note that this only handles DRM core IOCTLs, if the driver has
 978  * botched IOCTL itself, it must handle those by wrapping this function.
 979  *
 980  * Returns:
 981  * Zero on success, negative error code on failure.
 982  */
 983 long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 984 {
 985         unsigned int nr = DRM_IOCTL_NR(cmd);
 986         struct drm_file *file_priv = filp->private_data;
 987         drm_ioctl_compat_t *fn;
 988         int ret;
 989
 990         /* Assume that ioctls without an explicit compat routine will just
 991          * work.  This may not always be a good assumption, but it's better
 992          * than always failing.
 993          */
 994         if (nr >= ARRAY_SIZE(drm_compat_ioctls))
 995                 return drm_ioctl(filp, cmd, arg);
 996
 997         fn = drm_compat_ioctls[nr].fn;
 998         if (!fn)
 999                 return drm_ioctl(filp, cmd, arg);
1000
1001         DRM_DEBUG("comm=\"%s\", pid=%d, dev=0x%lx, auth=%d, %s\n",
1002                   current->comm, task_pid_nr(current),
1003                   (long)old_encode_dev(file_priv->minor->kdev->devt),
1004                   file_priv->authenticated,
1005                   drm_compat_ioctls[nr].name);
1006         ret = (*fn)(filp, cmd, arg);
1007         if (ret)
1008                 DRM_DEBUG("ret = %d\n", ret);
1009         return ret;
1010 }
1011 EXPORT_SYMBOL(drm_compat_ioctl);