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0001 /*
0002  * \file drm_ioc32.c
0003  *
0004  * 32-bit ioctl compatibility routines for the DRM.
0005  *
0006  * \author Paul Mackerras <paulus@samba.org>
0007  *
0008  * Copyright (C) Paul Mackerras 2005.
0009  * All Rights Reserved.
0010  *
0011  * Permission is hereby granted, free of charge, to any person obtaining a
0012  * copy of this software and associated documentation files (the "Software"),
0013  * to deal in the Software without restriction, including without limitation
0014  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0015  * and/or sell copies of the Software, and to permit persons to whom the
0016  * Software is furnished to do so, subject to the following conditions:
0017  *
0018  * The above copyright notice and this permission notice (including the next
0019  * paragraph) shall be included in all copies or substantial portions of the
0020  * Software.
0021  *
0022  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0023  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0024  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0025  * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
0026  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
0027  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
0028  * IN THE SOFTWARE.
0029  */
0030 #include <linux/compat.h>
0031 #include <linux/ratelimit.h>
0032 #include <linux/export.h>
0033 
0034 #include <drm/drm_file.h>
0035 #include <drm/drm_print.h>
0036 
0037 #include "drm_crtc_internal.h"
0038 #include "drm_internal.h"
0039 #include "drm_legacy.h"
0040 
0041 #define DRM_IOCTL_VERSION32     DRM_IOWR(0x00, drm_version32_t)
0042 #define DRM_IOCTL_GET_UNIQUE32      DRM_IOWR(0x01, drm_unique32_t)
0043 #define DRM_IOCTL_GET_MAP32     DRM_IOWR(0x04, drm_map32_t)
0044 #define DRM_IOCTL_GET_CLIENT32      DRM_IOWR(0x05, drm_client32_t)
0045 #define DRM_IOCTL_GET_STATS32       DRM_IOR( 0x06, drm_stats32_t)
0046 
0047 #define DRM_IOCTL_SET_UNIQUE32      DRM_IOW( 0x10, drm_unique32_t)
0048 #define DRM_IOCTL_ADD_MAP32     DRM_IOWR(0x15, drm_map32_t)
0049 #define DRM_IOCTL_ADD_BUFS32        DRM_IOWR(0x16, drm_buf_desc32_t)
0050 #define DRM_IOCTL_MARK_BUFS32       DRM_IOW( 0x17, drm_buf_desc32_t)
0051 #define DRM_IOCTL_INFO_BUFS32       DRM_IOWR(0x18, drm_buf_info32_t)
0052 #define DRM_IOCTL_MAP_BUFS32        DRM_IOWR(0x19, drm_buf_map32_t)
0053 #define DRM_IOCTL_FREE_BUFS32       DRM_IOW( 0x1a, drm_buf_free32_t)
0054 
0055 #define DRM_IOCTL_RM_MAP32      DRM_IOW( 0x1b, drm_map32_t)
0056 
0057 #define DRM_IOCTL_SET_SAREA_CTX32   DRM_IOW( 0x1c, drm_ctx_priv_map32_t)
0058 #define DRM_IOCTL_GET_SAREA_CTX32   DRM_IOWR(0x1d, drm_ctx_priv_map32_t)
0059 
0060 #define DRM_IOCTL_RES_CTX32     DRM_IOWR(0x26, drm_ctx_res32_t)
0061 #define DRM_IOCTL_DMA32         DRM_IOWR(0x29, drm_dma32_t)
0062 
0063 #define DRM_IOCTL_AGP_ENABLE32      DRM_IOW( 0x32, drm_agp_mode32_t)
0064 #define DRM_IOCTL_AGP_INFO32        DRM_IOR( 0x33, drm_agp_info32_t)
0065 #define DRM_IOCTL_AGP_ALLOC32       DRM_IOWR(0x34, drm_agp_buffer32_t)
0066 #define DRM_IOCTL_AGP_FREE32        DRM_IOW( 0x35, drm_agp_buffer32_t)
0067 #define DRM_IOCTL_AGP_BIND32        DRM_IOW( 0x36, drm_agp_binding32_t)
0068 #define DRM_IOCTL_AGP_UNBIND32      DRM_IOW( 0x37, drm_agp_binding32_t)
0069 
0070 #define DRM_IOCTL_SG_ALLOC32        DRM_IOW( 0x38, drm_scatter_gather32_t)
0071 #define DRM_IOCTL_SG_FREE32     DRM_IOW( 0x39, drm_scatter_gather32_t)
0072 
0073 #define DRM_IOCTL_UPDATE_DRAW32     DRM_IOW( 0x3f, drm_update_draw32_t)
0074 
0075 #define DRM_IOCTL_WAIT_VBLANK32     DRM_IOWR(0x3a, drm_wait_vblank32_t)
0076 
0077 #define DRM_IOCTL_MODE_ADDFB232     DRM_IOWR(0xb8, drm_mode_fb_cmd232_t)
0078 
0079 typedef struct drm_version_32 {
0080     int version_major;    /* Major version */
0081     int version_minor;    /* Minor version */
0082     int version_patchlevel;    /* Patch level */
0083     u32 name_len;         /* Length of name buffer */
0084     u32 name;         /* Name of driver */
0085     u32 date_len;         /* Length of date buffer */
0086     u32 date;         /* User-space buffer to hold date */
0087     u32 desc_len;         /* Length of desc buffer */
0088     u32 desc;         /* User-space buffer to hold desc */
0089 } drm_version32_t;
0090 
0091 static int compat_drm_version(struct file *file, unsigned int cmd,
0092                   unsigned long arg)
0093 {
0094     drm_version32_t v32;
0095     struct drm_version v;
0096     int err;
0097 
0098     if (copy_from_user(&v32, (void __user *)arg, sizeof(v32)))
0099         return -EFAULT;
0100 
0101     memset(&v, 0, sizeof(v));
0102 
0103     v = (struct drm_version) {
0104         .name_len = v32.name_len,
0105         .name = compat_ptr(v32.name),
0106         .date_len = v32.date_len,
0107         .date = compat_ptr(v32.date),
0108         .desc_len = v32.desc_len,
0109         .desc = compat_ptr(v32.desc),
0110     };
0111     err = drm_ioctl_kernel(file, drm_version, &v,
0112                    DRM_RENDER_ALLOW);
0113     if (err)
0114         return err;
0115 
0116     v32.version_major = v.version_major;
0117     v32.version_minor = v.version_minor;
0118     v32.version_patchlevel = v.version_patchlevel;
0119     v32.name_len = v.name_len;
0120     v32.date_len = v.date_len;
0121     v32.desc_len = v.desc_len;
0122     if (copy_to_user((void __user *)arg, &v32, sizeof(v32)))
0123         return -EFAULT;
0124     return 0;
0125 }
0126 
0127 typedef struct drm_unique32 {
0128     u32 unique_len; /* Length of unique */
0129     u32 unique; /* Unique name for driver instantiation */
0130 } drm_unique32_t;
0131 
0132 static int compat_drm_getunique(struct file *file, unsigned int cmd,
0133                 unsigned long arg)
0134 {
0135     drm_unique32_t uq32;
0136     struct drm_unique uq;
0137     int err;
0138 
0139     if (copy_from_user(&uq32, (void __user *)arg, sizeof(uq32)))
0140         return -EFAULT;
0141 
0142     memset(&uq, 0, sizeof(uq));
0143 
0144     uq = (struct drm_unique){
0145         .unique_len = uq32.unique_len,
0146         .unique = compat_ptr(uq32.unique),
0147     };
0148 
0149     err = drm_ioctl_kernel(file, drm_getunique, &uq, 0);
0150     if (err)
0151         return err;
0152 
0153     uq32.unique_len = uq.unique_len;
0154     if (copy_to_user((void __user *)arg, &uq32, sizeof(uq32)))
0155         return -EFAULT;
0156     return 0;
0157 }
0158 
0159 static int compat_drm_setunique(struct file *file, unsigned int cmd,
0160                 unsigned long arg)
0161 {
0162     /* it's dead */
0163     return -EINVAL;
0164 }
0165 
0166 #if IS_ENABLED(CONFIG_DRM_LEGACY)
0167 typedef struct drm_map32 {
0168     u32 offset;     /* Requested physical address (0 for SAREA) */
0169     u32 size;       /* Requested physical size (bytes) */
0170     enum drm_map_type type; /* Type of memory to map */
0171     enum drm_map_flags flags;   /* Flags */
0172     u32 handle;     /* User-space: "Handle" to pass to mmap() */
0173     int mtrr;       /* MTRR slot used */
0174 } drm_map32_t;
0175 
0176 static int compat_drm_getmap(struct file *file, unsigned int cmd,
0177                  unsigned long arg)
0178 {
0179     drm_map32_t __user *argp = (void __user *)arg;
0180     drm_map32_t m32;
0181     struct drm_map map;
0182     int err;
0183 
0184     if (copy_from_user(&m32, argp, sizeof(m32)))
0185         return -EFAULT;
0186 
0187     map.offset = m32.offset;
0188     err = drm_ioctl_kernel(file, drm_legacy_getmap_ioctl, &map, 0);
0189     if (err)
0190         return err;
0191 
0192     m32.offset = map.offset;
0193     m32.size = map.size;
0194     m32.type = map.type;
0195     m32.flags = map.flags;
0196     m32.handle = ptr_to_compat((void __user *)map.handle);
0197     m32.mtrr = map.mtrr;
0198     if (copy_to_user(argp, &m32, sizeof(m32)))
0199         return -EFAULT;
0200     return 0;
0201 
0202 }
0203 
0204 static int compat_drm_addmap(struct file *file, unsigned int cmd,
0205                  unsigned long arg)
0206 {
0207     drm_map32_t __user *argp = (void __user *)arg;
0208     drm_map32_t m32;
0209     struct drm_map map;
0210     int err;
0211 
0212     if (copy_from_user(&m32, argp, sizeof(m32)))
0213         return -EFAULT;
0214 
0215     map.offset = m32.offset;
0216     map.size = m32.size;
0217     map.type = m32.type;
0218     map.flags = m32.flags;
0219 
0220     err = drm_ioctl_kernel(file, drm_legacy_addmap_ioctl, &map,
0221                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0222     if (err)
0223         return err;
0224 
0225     m32.offset = map.offset;
0226     m32.mtrr = map.mtrr;
0227     m32.handle = ptr_to_compat((void __user *)map.handle);
0228     if (map.handle != compat_ptr(m32.handle))
0229         pr_err_ratelimited("compat_drm_addmap truncated handle %p for type %d offset %x\n",
0230                    map.handle, m32.type, m32.offset);
0231 
0232     if (copy_to_user(argp, &m32, sizeof(m32)))
0233         return -EFAULT;
0234 
0235     return 0;
0236 }
0237 
0238 static int compat_drm_rmmap(struct file *file, unsigned int cmd,
0239                 unsigned long arg)
0240 {
0241     drm_map32_t __user *argp = (void __user *)arg;
0242     struct drm_map map;
0243     u32 handle;
0244 
0245     if (get_user(handle, &argp->handle))
0246         return -EFAULT;
0247     map.handle = compat_ptr(handle);
0248     return drm_ioctl_kernel(file, drm_legacy_rmmap_ioctl, &map, DRM_AUTH);
0249 }
0250 #endif
0251 
0252 typedef struct drm_client32 {
0253     int idx;    /* Which client desired? */
0254     int auth;   /* Is client authenticated? */
0255     u32 pid;    /* Process ID */
0256     u32 uid;    /* User ID */
0257     u32 magic;  /* Magic */
0258     u32 iocs;   /* Ioctl count */
0259 } drm_client32_t;
0260 
0261 static int compat_drm_getclient(struct file *file, unsigned int cmd,
0262                 unsigned long arg)
0263 {
0264     drm_client32_t c32;
0265     drm_client32_t __user *argp = (void __user *)arg;
0266     struct drm_client client;
0267     int err;
0268 
0269     if (copy_from_user(&c32, argp, sizeof(c32)))
0270         return -EFAULT;
0271 
0272     memset(&client, 0, sizeof(client));
0273 
0274     client.idx = c32.idx;
0275 
0276     err = drm_ioctl_kernel(file, drm_getclient, &client, 0);
0277     if (err)
0278         return err;
0279 
0280     c32.idx = client.idx;
0281     c32.auth = client.auth;
0282     c32.pid = client.pid;
0283     c32.uid = client.uid;
0284     c32.magic = client.magic;
0285     c32.iocs = client.iocs;
0286 
0287     if (copy_to_user(argp, &c32, sizeof(c32)))
0288         return -EFAULT;
0289     return 0;
0290 }
0291 
0292 typedef struct drm_stats32 {
0293     u32 count;
0294     struct {
0295         u32 value;
0296         enum drm_stat_type type;
0297     } data[15];
0298 } drm_stats32_t;
0299 
0300 static int compat_drm_getstats(struct file *file, unsigned int cmd,
0301                    unsigned long arg)
0302 {
0303     drm_stats32_t __user *argp = (void __user *)arg;
0304 
0305     /* getstats is defunct, just clear */
0306     if (clear_user(argp, sizeof(drm_stats32_t)))
0307         return -EFAULT;
0308     return 0;
0309 }
0310 
0311 #if IS_ENABLED(CONFIG_DRM_LEGACY)
0312 typedef struct drm_buf_desc32 {
0313     int count;       /* Number of buffers of this size */
0314     int size;        /* Size in bytes */
0315     int low_mark;        /* Low water mark */
0316     int high_mark;       /* High water mark */
0317     int flags;
0318     u32 agp_start;       /* Start address in the AGP aperture */
0319 } drm_buf_desc32_t;
0320 
0321 static int compat_drm_addbufs(struct file *file, unsigned int cmd,
0322                   unsigned long arg)
0323 {
0324     drm_buf_desc32_t __user *argp = (void __user *)arg;
0325     drm_buf_desc32_t desc32;
0326     struct drm_buf_desc desc;
0327     int err;
0328 
0329     if (copy_from_user(&desc32, argp, sizeof(drm_buf_desc32_t)))
0330         return -EFAULT;
0331 
0332     desc = (struct drm_buf_desc){
0333         desc32.count, desc32.size, desc32.low_mark, desc32.high_mark,
0334         desc32.flags, desc32.agp_start
0335     };
0336 
0337     err = drm_ioctl_kernel(file, drm_legacy_addbufs, &desc,
0338                    DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0339     if (err)
0340         return err;
0341 
0342     desc32 = (drm_buf_desc32_t){
0343         desc.count, desc.size, desc.low_mark, desc.high_mark,
0344         desc.flags, desc.agp_start
0345     };
0346     if (copy_to_user(argp, &desc32, sizeof(drm_buf_desc32_t)))
0347         return -EFAULT;
0348 
0349     return 0;
0350 }
0351 
0352 static int compat_drm_markbufs(struct file *file, unsigned int cmd,
0353                    unsigned long arg)
0354 {
0355     drm_buf_desc32_t b32;
0356     drm_buf_desc32_t __user *argp = (void __user *)arg;
0357     struct drm_buf_desc buf;
0358 
0359     if (copy_from_user(&b32, argp, sizeof(b32)))
0360         return -EFAULT;
0361 
0362     buf.size = b32.size;
0363     buf.low_mark = b32.low_mark;
0364     buf.high_mark = b32.high_mark;
0365 
0366     return drm_ioctl_kernel(file, drm_legacy_markbufs, &buf,
0367                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0368 }
0369 
0370 typedef struct drm_buf_info32 {
0371     int count;      /**< Entries in list */
0372     u32 list;
0373 } drm_buf_info32_t;
0374 
0375 static int copy_one_buf32(void *data, int count, struct drm_buf_entry *from)
0376 {
0377     drm_buf_info32_t *request = data;
0378     drm_buf_desc32_t __user *to = compat_ptr(request->list);
0379     drm_buf_desc32_t v = {.count = from->buf_count,
0380                   .size = from->buf_size,
0381                   .low_mark = from->low_mark,
0382                   .high_mark = from->high_mark};
0383 
0384     if (copy_to_user(to + count, &v, offsetof(drm_buf_desc32_t, flags)))
0385         return -EFAULT;
0386     return 0;
0387 }
0388 
0389 static int drm_legacy_infobufs32(struct drm_device *dev, void *data,
0390             struct drm_file *file_priv)
0391 {
0392     drm_buf_info32_t *request = data;
0393 
0394     return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf32);
0395 }
0396 
0397 static int compat_drm_infobufs(struct file *file, unsigned int cmd,
0398                    unsigned long arg)
0399 {
0400     drm_buf_info32_t req32;
0401     drm_buf_info32_t __user *argp = (void __user *)arg;
0402     int err;
0403 
0404     if (copy_from_user(&req32, argp, sizeof(req32)))
0405         return -EFAULT;
0406 
0407     if (req32.count < 0)
0408         req32.count = 0;
0409 
0410     err = drm_ioctl_kernel(file, drm_legacy_infobufs32, &req32, DRM_AUTH);
0411     if (err)
0412         return err;
0413 
0414     if (put_user(req32.count, &argp->count))
0415         return -EFAULT;
0416 
0417     return 0;
0418 }
0419 
0420 typedef struct drm_buf_pub32 {
0421     int idx;        /**< Index into the master buffer list */
0422     int total;      /**< Buffer size */
0423     int used;       /**< Amount of buffer in use (for DMA) */
0424     u32 address;        /**< Address of buffer */
0425 } drm_buf_pub32_t;
0426 
0427 typedef struct drm_buf_map32 {
0428     int count;      /**< Length of the buffer list */
0429     u32 virtual;        /**< Mmap'd area in user-virtual */
0430     u32 list;       /**< Buffer information */
0431 } drm_buf_map32_t;
0432 
0433 static int map_one_buf32(void *data, int idx, unsigned long virtual,
0434             struct drm_buf *buf)
0435 {
0436     drm_buf_map32_t *request = data;
0437     drm_buf_pub32_t __user *to = compat_ptr(request->list) + idx;
0438     drm_buf_pub32_t v;
0439 
0440     v.idx = buf->idx;
0441     v.total = buf->total;
0442     v.used = 0;
0443     v.address = virtual + buf->offset;
0444     if (copy_to_user(to, &v, sizeof(v)))
0445         return -EFAULT;
0446     return 0;
0447 }
0448 
0449 static int drm_legacy_mapbufs32(struct drm_device *dev, void *data,
0450                struct drm_file *file_priv)
0451 {
0452     drm_buf_map32_t *request = data;
0453     void __user *v;
0454     int err = __drm_legacy_mapbufs(dev, data, &request->count,
0455                     &v, map_one_buf32,
0456                     file_priv);
0457     request->virtual = ptr_to_compat(v);
0458     return err;
0459 }
0460 
0461 static int compat_drm_mapbufs(struct file *file, unsigned int cmd,
0462                   unsigned long arg)
0463 {
0464     drm_buf_map32_t __user *argp = (void __user *)arg;
0465     drm_buf_map32_t req32;
0466     int err;
0467 
0468     if (copy_from_user(&req32, argp, sizeof(req32)))
0469         return -EFAULT;
0470     if (req32.count < 0)
0471         return -EINVAL;
0472 
0473     err = drm_ioctl_kernel(file, drm_legacy_mapbufs32, &req32, DRM_AUTH);
0474     if (err)
0475         return err;
0476 
0477     if (put_user(req32.count, &argp->count)
0478         || put_user(req32.virtual, &argp->virtual))
0479         return -EFAULT;
0480 
0481     return 0;
0482 }
0483 
0484 typedef struct drm_buf_free32 {
0485     int count;
0486     u32 list;
0487 } drm_buf_free32_t;
0488 
0489 static int compat_drm_freebufs(struct file *file, unsigned int cmd,
0490                    unsigned long arg)
0491 {
0492     drm_buf_free32_t req32;
0493     struct drm_buf_free request;
0494     drm_buf_free32_t __user *argp = (void __user *)arg;
0495 
0496     if (copy_from_user(&req32, argp, sizeof(req32)))
0497         return -EFAULT;
0498 
0499     request.count = req32.count;
0500     request.list = compat_ptr(req32.list);
0501     return drm_ioctl_kernel(file, drm_legacy_freebufs, &request, DRM_AUTH);
0502 }
0503 
0504 typedef struct drm_ctx_priv_map32 {
0505     unsigned int ctx_id;     /**< Context requesting private mapping */
0506     u32 handle;     /**< Handle of map */
0507 } drm_ctx_priv_map32_t;
0508 
0509 static int compat_drm_setsareactx(struct file *file, unsigned int cmd,
0510                   unsigned long arg)
0511 {
0512     drm_ctx_priv_map32_t req32;
0513     struct drm_ctx_priv_map request;
0514     drm_ctx_priv_map32_t __user *argp = (void __user *)arg;
0515 
0516     if (copy_from_user(&req32, argp, sizeof(req32)))
0517         return -EFAULT;
0518 
0519     request.ctx_id = req32.ctx_id;
0520     request.handle = compat_ptr(req32.handle);
0521     return drm_ioctl_kernel(file, drm_legacy_setsareactx, &request,
0522                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0523 }
0524 
0525 static int compat_drm_getsareactx(struct file *file, unsigned int cmd,
0526                   unsigned long arg)
0527 {
0528     struct drm_ctx_priv_map req;
0529     drm_ctx_priv_map32_t req32;
0530     drm_ctx_priv_map32_t __user *argp = (void __user *)arg;
0531     int err;
0532 
0533     if (copy_from_user(&req32, argp, sizeof(req32)))
0534         return -EFAULT;
0535 
0536     req.ctx_id = req32.ctx_id;
0537     err = drm_ioctl_kernel(file, drm_legacy_getsareactx, &req, DRM_AUTH);
0538     if (err)
0539         return err;
0540 
0541     req32.handle = ptr_to_compat((void __user *)req.handle);
0542     if (copy_to_user(argp, &req32, sizeof(req32)))
0543         return -EFAULT;
0544 
0545     return 0;
0546 }
0547 
0548 typedef struct drm_ctx_res32 {
0549     int count;
0550     u32 contexts;
0551 } drm_ctx_res32_t;
0552 
0553 static int compat_drm_resctx(struct file *file, unsigned int cmd,
0554                  unsigned long arg)
0555 {
0556     drm_ctx_res32_t __user *argp = (void __user *)arg;
0557     drm_ctx_res32_t res32;
0558     struct drm_ctx_res res;
0559     int err;
0560 
0561     if (copy_from_user(&res32, argp, sizeof(res32)))
0562         return -EFAULT;
0563 
0564     res.count = res32.count;
0565     res.contexts = compat_ptr(res32.contexts);
0566     err = drm_ioctl_kernel(file, drm_legacy_resctx, &res, DRM_AUTH);
0567     if (err)
0568         return err;
0569 
0570     res32.count = res.count;
0571     if (copy_to_user(argp, &res32, sizeof(res32)))
0572         return -EFAULT;
0573 
0574     return 0;
0575 }
0576 
0577 typedef struct drm_dma32 {
0578     int context;          /**< Context handle */
0579     int send_count;       /**< Number of buffers to send */
0580     u32 send_indices;     /**< List of handles to buffers */
0581     u32 send_sizes;       /**< Lengths of data to send */
0582     enum drm_dma_flags flags;         /**< Flags */
0583     int request_count;    /**< Number of buffers requested */
0584     int request_size;     /**< Desired size for buffers */
0585     u32 request_indices;      /**< Buffer information */
0586     u32 request_sizes;
0587     int granted_count;    /**< Number of buffers granted */
0588 } drm_dma32_t;
0589 
0590 static int compat_drm_dma(struct file *file, unsigned int cmd,
0591               unsigned long arg)
0592 {
0593     drm_dma32_t d32;
0594     drm_dma32_t __user *argp = (void __user *)arg;
0595     struct drm_dma d;
0596     int err;
0597 
0598     if (copy_from_user(&d32, argp, sizeof(d32)))
0599         return -EFAULT;
0600 
0601     d.context = d32.context;
0602     d.send_count = d32.send_count;
0603     d.send_indices = compat_ptr(d32.send_indices);
0604     d.send_sizes = compat_ptr(d32.send_sizes);
0605     d.flags = d32.flags;
0606     d.request_count = d32.request_count;
0607     d.request_indices = compat_ptr(d32.request_indices);
0608     d.request_sizes = compat_ptr(d32.request_sizes);
0609     err = drm_ioctl_kernel(file, drm_legacy_dma_ioctl, &d, DRM_AUTH);
0610     if (err)
0611         return err;
0612 
0613     if (put_user(d.request_size, &argp->request_size)
0614         || put_user(d.granted_count, &argp->granted_count))
0615         return -EFAULT;
0616 
0617     return 0;
0618 }
0619 #endif
0620 
0621 #if IS_ENABLED(CONFIG_DRM_LEGACY)
0622 #if IS_ENABLED(CONFIG_AGP)
0623 typedef struct drm_agp_mode32 {
0624     u32 mode;   /**< AGP mode */
0625 } drm_agp_mode32_t;
0626 
0627 static int compat_drm_agp_enable(struct file *file, unsigned int cmd,
0628                  unsigned long arg)
0629 {
0630     drm_agp_mode32_t __user *argp = (void __user *)arg;
0631     struct drm_agp_mode mode;
0632 
0633     if (get_user(mode.mode, &argp->mode))
0634         return -EFAULT;
0635 
0636     return drm_ioctl_kernel(file,  drm_legacy_agp_enable_ioctl, &mode,
0637                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0638 }
0639 
0640 typedef struct drm_agp_info32 {
0641     int agp_version_major;
0642     int agp_version_minor;
0643     u32 mode;
0644     u32 aperture_base;  /* physical address */
0645     u32 aperture_size;  /* bytes */
0646     u32 memory_allowed; /* bytes */
0647     u32 memory_used;
0648 
0649     /* PCI information */
0650     unsigned short id_vendor;
0651     unsigned short id_device;
0652 } drm_agp_info32_t;
0653 
0654 static int compat_drm_agp_info(struct file *file, unsigned int cmd,
0655                    unsigned long arg)
0656 {
0657     drm_agp_info32_t __user *argp = (void __user *)arg;
0658     drm_agp_info32_t i32;
0659     struct drm_agp_info info;
0660     int err;
0661 
0662     err = drm_ioctl_kernel(file, drm_legacy_agp_info_ioctl, &info, DRM_AUTH);
0663     if (err)
0664         return err;
0665 
0666     i32.agp_version_major = info.agp_version_major;
0667     i32.agp_version_minor = info.agp_version_minor;
0668     i32.mode = info.mode;
0669     i32.aperture_base = info.aperture_base;
0670     i32.aperture_size = info.aperture_size;
0671     i32.memory_allowed = info.memory_allowed;
0672     i32.memory_used = info.memory_used;
0673     i32.id_vendor = info.id_vendor;
0674     i32.id_device = info.id_device;
0675     if (copy_to_user(argp, &i32, sizeof(i32)))
0676         return -EFAULT;
0677 
0678     return 0;
0679 }
0680 
0681 typedef struct drm_agp_buffer32 {
0682     u32 size;   /**< In bytes -- will round to page boundary */
0683     u32 handle; /**< Used for binding / unbinding */
0684     u32 type;   /**< Type of memory to allocate */
0685     u32 physical;   /**< Physical used by i810 */
0686 } drm_agp_buffer32_t;
0687 
0688 static int compat_drm_agp_alloc(struct file *file, unsigned int cmd,
0689                 unsigned long arg)
0690 {
0691     drm_agp_buffer32_t __user *argp = (void __user *)arg;
0692     drm_agp_buffer32_t req32;
0693     struct drm_agp_buffer request;
0694     int err;
0695 
0696     if (copy_from_user(&req32, argp, sizeof(req32)))
0697         return -EFAULT;
0698 
0699     request.size = req32.size;
0700     request.type = req32.type;
0701     err = drm_ioctl_kernel(file, drm_legacy_agp_alloc_ioctl, &request,
0702                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0703     if (err)
0704         return err;
0705 
0706     req32.handle = request.handle;
0707     req32.physical = request.physical;
0708     if (copy_to_user(argp, &req32, sizeof(req32))) {
0709         drm_ioctl_kernel(file, drm_legacy_agp_free_ioctl, &request,
0710                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0711         return -EFAULT;
0712     }
0713 
0714     return 0;
0715 }
0716 
0717 static int compat_drm_agp_free(struct file *file, unsigned int cmd,
0718                    unsigned long arg)
0719 {
0720     drm_agp_buffer32_t __user *argp = (void __user *)arg;
0721     struct drm_agp_buffer request;
0722 
0723     if (get_user(request.handle, &argp->handle))
0724         return -EFAULT;
0725 
0726     return drm_ioctl_kernel(file, drm_legacy_agp_free_ioctl, &request,
0727                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0728 }
0729 
0730 typedef struct drm_agp_binding32 {
0731     u32 handle; /**< From drm_agp_buffer */
0732     u32 offset; /**< In bytes -- will round to page boundary */
0733 } drm_agp_binding32_t;
0734 
0735 static int compat_drm_agp_bind(struct file *file, unsigned int cmd,
0736                    unsigned long arg)
0737 {
0738     drm_agp_binding32_t __user *argp = (void __user *)arg;
0739     drm_agp_binding32_t req32;
0740     struct drm_agp_binding request;
0741 
0742     if (copy_from_user(&req32, argp, sizeof(req32)))
0743         return -EFAULT;
0744 
0745     request.handle = req32.handle;
0746     request.offset = req32.offset;
0747     return drm_ioctl_kernel(file, drm_legacy_agp_bind_ioctl, &request,
0748                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0749 }
0750 
0751 static int compat_drm_agp_unbind(struct file *file, unsigned int cmd,
0752                  unsigned long arg)
0753 {
0754     drm_agp_binding32_t __user *argp = (void __user *)arg;
0755     struct drm_agp_binding request;
0756 
0757     if (get_user(request.handle, &argp->handle))
0758         return -EFAULT;
0759 
0760     return drm_ioctl_kernel(file, drm_legacy_agp_unbind_ioctl, &request,
0761                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0762 }
0763 #endif /* CONFIG_AGP */
0764 
0765 typedef struct drm_scatter_gather32 {
0766     u32 size;   /**< In bytes -- will round to page boundary */
0767     u32 handle; /**< Used for mapping / unmapping */
0768 } drm_scatter_gather32_t;
0769 
0770 static int compat_drm_sg_alloc(struct file *file, unsigned int cmd,
0771                    unsigned long arg)
0772 {
0773     drm_scatter_gather32_t __user *argp = (void __user *)arg;
0774     struct drm_scatter_gather request;
0775     int err;
0776 
0777     if (get_user(request.size, &argp->size))
0778         return -EFAULT;
0779 
0780     err = drm_ioctl_kernel(file, drm_legacy_sg_alloc, &request,
0781                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0782     if (err)
0783         return err;
0784 
0785     /* XXX not sure about the handle conversion here... */
0786     if (put_user(request.handle >> PAGE_SHIFT, &argp->handle))
0787         return -EFAULT;
0788 
0789     return 0;
0790 }
0791 
0792 static int compat_drm_sg_free(struct file *file, unsigned int cmd,
0793                   unsigned long arg)
0794 {
0795     drm_scatter_gather32_t __user *argp = (void __user *)arg;
0796     struct drm_scatter_gather request;
0797     unsigned long x;
0798 
0799     if (get_user(x, &argp->handle))
0800         return -EFAULT;
0801     request.handle = x << PAGE_SHIFT;
0802     return drm_ioctl_kernel(file, drm_legacy_sg_free, &request,
0803                 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
0804 }
0805 #endif
0806 #if defined(CONFIG_X86)
0807 typedef struct drm_update_draw32 {
0808     drm_drawable_t handle;
0809     unsigned int type;
0810     unsigned int num;
0811     /* 64-bit version has a 32-bit pad here */
0812     u64 data;   /**< Pointer */
0813 } __attribute__((packed)) drm_update_draw32_t;
0814 
0815 static int compat_drm_update_draw(struct file *file, unsigned int cmd,
0816                   unsigned long arg)
0817 {
0818     /* update_draw is defunct */
0819     return 0;
0820 }
0821 #endif
0822 
0823 struct drm_wait_vblank_request32 {
0824     enum drm_vblank_seq_type type;
0825     unsigned int sequence;
0826     u32 signal;
0827 };
0828 
0829 struct drm_wait_vblank_reply32 {
0830     enum drm_vblank_seq_type type;
0831     unsigned int sequence;
0832     s32 tval_sec;
0833     s32 tval_usec;
0834 };
0835 
0836 typedef union drm_wait_vblank32 {
0837     struct drm_wait_vblank_request32 request;
0838     struct drm_wait_vblank_reply32 reply;
0839 } drm_wait_vblank32_t;
0840 
0841 static int compat_drm_wait_vblank(struct file *file, unsigned int cmd,
0842                   unsigned long arg)
0843 {
0844     drm_wait_vblank32_t __user *argp = (void __user *)arg;
0845     drm_wait_vblank32_t req32;
0846     union drm_wait_vblank req;
0847     int err;
0848 
0849     if (copy_from_user(&req32, argp, sizeof(req32)))
0850         return -EFAULT;
0851 
0852     memset(&req, 0, sizeof(req));
0853 
0854     req.request.type = req32.request.type;
0855     req.request.sequence = req32.request.sequence;
0856     req.request.signal = req32.request.signal;
0857     err = drm_ioctl_kernel(file, drm_wait_vblank_ioctl, &req, DRM_UNLOCKED);
0858 
0859     req32.reply.type = req.reply.type;
0860     req32.reply.sequence = req.reply.sequence;
0861     req32.reply.tval_sec = req.reply.tval_sec;
0862     req32.reply.tval_usec = req.reply.tval_usec;
0863     if (copy_to_user(argp, &req32, sizeof(req32)))
0864         return -EFAULT;
0865 
0866     return err;
0867 }
0868 
0869 #if defined(CONFIG_X86)
0870 typedef struct drm_mode_fb_cmd232 {
0871     u32 fb_id;
0872     u32 width;
0873     u32 height;
0874     u32 pixel_format;
0875     u32 flags;
0876     u32 handles[4];
0877     u32 pitches[4];
0878     u32 offsets[4];
0879     u64 modifier[4];
0880 } __attribute__((packed)) drm_mode_fb_cmd232_t;
0881 
0882 static int compat_drm_mode_addfb2(struct file *file, unsigned int cmd,
0883                   unsigned long arg)
0884 {
0885     struct drm_mode_fb_cmd232 __user *argp = (void __user *)arg;
0886     struct drm_mode_fb_cmd2 req64;
0887     int err;
0888 
0889     memset(&req64, 0, sizeof(req64));
0890 
0891     if (copy_from_user(&req64, argp,
0892                offsetof(drm_mode_fb_cmd232_t, modifier)))
0893         return -EFAULT;
0894 
0895     if (copy_from_user(&req64.modifier, &argp->modifier,
0896                sizeof(req64.modifier)))
0897         return -EFAULT;
0898 
0899     err = drm_ioctl_kernel(file, drm_mode_addfb2, &req64, 0);
0900     if (err)
0901         return err;
0902 
0903     if (put_user(req64.fb_id, &argp->fb_id))
0904         return -EFAULT;
0905 
0906     return 0;
0907 }
0908 #endif
0909 
0910 static struct {
0911     drm_ioctl_compat_t *fn;
0912     char *name;
0913 } drm_compat_ioctls[] = {
0914 #define DRM_IOCTL32_DEF(n, f) [DRM_IOCTL_NR(n##32)] = {.fn = f, .name = #n}
0915     DRM_IOCTL32_DEF(DRM_IOCTL_VERSION, compat_drm_version),
0916     DRM_IOCTL32_DEF(DRM_IOCTL_GET_UNIQUE, compat_drm_getunique),
0917 #if IS_ENABLED(CONFIG_DRM_LEGACY)
0918     DRM_IOCTL32_DEF(DRM_IOCTL_GET_MAP, compat_drm_getmap),
0919 #endif
0920     DRM_IOCTL32_DEF(DRM_IOCTL_GET_CLIENT, compat_drm_getclient),
0921     DRM_IOCTL32_DEF(DRM_IOCTL_GET_STATS, compat_drm_getstats),
0922     DRM_IOCTL32_DEF(DRM_IOCTL_SET_UNIQUE, compat_drm_setunique),
0923 #if IS_ENABLED(CONFIG_DRM_LEGACY)
0924     DRM_IOCTL32_DEF(DRM_IOCTL_ADD_MAP, compat_drm_addmap),
0925     DRM_IOCTL32_DEF(DRM_IOCTL_ADD_BUFS, compat_drm_addbufs),
0926     DRM_IOCTL32_DEF(DRM_IOCTL_MARK_BUFS, compat_drm_markbufs),
0927     DRM_IOCTL32_DEF(DRM_IOCTL_INFO_BUFS, compat_drm_infobufs),
0928     DRM_IOCTL32_DEF(DRM_IOCTL_MAP_BUFS, compat_drm_mapbufs),
0929     DRM_IOCTL32_DEF(DRM_IOCTL_FREE_BUFS, compat_drm_freebufs),
0930     DRM_IOCTL32_DEF(DRM_IOCTL_RM_MAP, compat_drm_rmmap),
0931     DRM_IOCTL32_DEF(DRM_IOCTL_SET_SAREA_CTX, compat_drm_setsareactx),
0932     DRM_IOCTL32_DEF(DRM_IOCTL_GET_SAREA_CTX, compat_drm_getsareactx),
0933     DRM_IOCTL32_DEF(DRM_IOCTL_RES_CTX, compat_drm_resctx),
0934     DRM_IOCTL32_DEF(DRM_IOCTL_DMA, compat_drm_dma),
0935 #if IS_ENABLED(CONFIG_AGP)
0936     DRM_IOCTL32_DEF(DRM_IOCTL_AGP_ENABLE, compat_drm_agp_enable),
0937     DRM_IOCTL32_DEF(DRM_IOCTL_AGP_INFO, compat_drm_agp_info),
0938     DRM_IOCTL32_DEF(DRM_IOCTL_AGP_ALLOC, compat_drm_agp_alloc),
0939     DRM_IOCTL32_DEF(DRM_IOCTL_AGP_FREE, compat_drm_agp_free),
0940     DRM_IOCTL32_DEF(DRM_IOCTL_AGP_BIND, compat_drm_agp_bind),
0941     DRM_IOCTL32_DEF(DRM_IOCTL_AGP_UNBIND, compat_drm_agp_unbind),
0942 #endif
0943 #endif
0944 #if IS_ENABLED(CONFIG_DRM_LEGACY)
0945     DRM_IOCTL32_DEF(DRM_IOCTL_SG_ALLOC, compat_drm_sg_alloc),
0946     DRM_IOCTL32_DEF(DRM_IOCTL_SG_FREE, compat_drm_sg_free),
0947 #endif
0948 #if defined(CONFIG_X86) || defined(CONFIG_IA64)
0949     DRM_IOCTL32_DEF(DRM_IOCTL_UPDATE_DRAW, compat_drm_update_draw),
0950 #endif
0951     DRM_IOCTL32_DEF(DRM_IOCTL_WAIT_VBLANK, compat_drm_wait_vblank),
0952 #if defined(CONFIG_X86) || defined(CONFIG_IA64)
0953     DRM_IOCTL32_DEF(DRM_IOCTL_MODE_ADDFB2, compat_drm_mode_addfb2),
0954 #endif
0955 };
0956 
0957 /**
0958  * drm_compat_ioctl - 32bit IOCTL compatibility handler for DRM drivers
0959  * @filp: file this ioctl is called on
0960  * @cmd: ioctl cmd number
0961  * @arg: user argument
0962  *
0963  * Compatibility handler for 32 bit userspace running on 64 kernels. All actual
0964  * IOCTL handling is forwarded to drm_ioctl(), while marshalling structures as
0965  * appropriate. Note that this only handles DRM core IOCTLs, if the driver has
0966  * botched IOCTL itself, it must handle those by wrapping this function.
0967  *
0968  * Returns:
0969  * Zero on success, negative error code on failure.
0970  */
0971 long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
0972 {
0973     unsigned int nr = DRM_IOCTL_NR(cmd);
0974     struct drm_file *file_priv = filp->private_data;
0975     drm_ioctl_compat_t *fn;
0976     int ret;
0977 
0978     /* Assume that ioctls without an explicit compat routine will just
0979      * work.  This may not always be a good assumption, but it's better
0980      * than always failing.
0981      */
0982     if (nr >= ARRAY_SIZE(drm_compat_ioctls))
0983         return drm_ioctl(filp, cmd, arg);
0984 
0985     fn = drm_compat_ioctls[nr].fn;
0986     if (!fn)
0987         return drm_ioctl(filp, cmd, arg);
0988 
0989     DRM_DEBUG("comm=\"%s\", pid=%d, dev=0x%lx, auth=%d, %s\n",
0990           current->comm, task_pid_nr(current),
0991           (long)old_encode_dev(file_priv->minor->kdev->devt),
0992           file_priv->authenticated,
0993           drm_compat_ioctls[nr].name);
0994     ret = (*fn)(filp, cmd, arg);
0995     if (ret)
0996         DRM_DEBUG("ret = %d\n", ret);
0997     return ret;
0998 }
0999 EXPORT_SYMBOL(drm_compat_ioctl);
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