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1/*2 * \file drm_ioc32.c3 *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 a12 * copy of this software and associated documentation files (the "Software"),13 * to deal in the Software without restriction, including without limitation14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,15 * and/or sell copies of the Software, and to permit persons to whom the16 * Software is furnished to do so, subject to the following conditions:17 *18 * The above copyright notice and this permission notice (including the next19 * paragraph) shall be included in all copies or substantial portions of the20 * Software.21 *22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL25 * 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 DEALINGS28 * IN THE SOFTWARE.29 */30#include <linux/compat.h>31#include <linux/ratelimit.h>32#include <linux/export.h>33 34#include <drm/drm_device.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 41#define DRM_IOCTL_VERSION32 DRM_IOWR(0x00, drm_version32_t)42#define DRM_IOCTL_GET_UNIQUE32 DRM_IOWR(0x01, drm_unique32_t)43#define DRM_IOCTL_GET_MAP32 DRM_IOWR(0x04, drm_map32_t)44#define DRM_IOCTL_GET_CLIENT32 DRM_IOWR(0x05, drm_client32_t)45#define DRM_IOCTL_GET_STATS32 DRM_IOR( 0x06, drm_stats32_t)46 47#define DRM_IOCTL_SET_UNIQUE32 DRM_IOW( 0x10, drm_unique32_t)48#define DRM_IOCTL_ADD_MAP32 DRM_IOWR(0x15, drm_map32_t)49#define DRM_IOCTL_ADD_BUFS32 DRM_IOWR(0x16, drm_buf_desc32_t)50#define DRM_IOCTL_MARK_BUFS32 DRM_IOW( 0x17, drm_buf_desc32_t)51#define DRM_IOCTL_INFO_BUFS32 DRM_IOWR(0x18, drm_buf_info32_t)52#define DRM_IOCTL_MAP_BUFS32 DRM_IOWR(0x19, drm_buf_map32_t)53#define DRM_IOCTL_FREE_BUFS32 DRM_IOW( 0x1a, drm_buf_free32_t)54 55#define DRM_IOCTL_RM_MAP32 DRM_IOW( 0x1b, drm_map32_t)56 57#define DRM_IOCTL_SET_SAREA_CTX32 DRM_IOW( 0x1c, drm_ctx_priv_map32_t)58#define DRM_IOCTL_GET_SAREA_CTX32 DRM_IOWR(0x1d, drm_ctx_priv_map32_t)59 60#define DRM_IOCTL_RES_CTX32 DRM_IOWR(0x26, drm_ctx_res32_t)61#define DRM_IOCTL_DMA32 DRM_IOWR(0x29, drm_dma32_t)62 63#define DRM_IOCTL_AGP_ENABLE32 DRM_IOW( 0x32, drm_agp_mode32_t)64#define DRM_IOCTL_AGP_INFO32 DRM_IOR( 0x33, drm_agp_info32_t)65#define DRM_IOCTL_AGP_ALLOC32 DRM_IOWR(0x34, drm_agp_buffer32_t)66#define DRM_IOCTL_AGP_FREE32 DRM_IOW( 0x35, drm_agp_buffer32_t)67#define DRM_IOCTL_AGP_BIND32 DRM_IOW( 0x36, drm_agp_binding32_t)68#define DRM_IOCTL_AGP_UNBIND32 DRM_IOW( 0x37, drm_agp_binding32_t)69 70#define DRM_IOCTL_SG_ALLOC32 DRM_IOW( 0x38, drm_scatter_gather32_t)71#define DRM_IOCTL_SG_FREE32 DRM_IOW( 0x39, drm_scatter_gather32_t)72 73#define DRM_IOCTL_UPDATE_DRAW32 DRM_IOW( 0x3f, drm_update_draw32_t)74 75#define DRM_IOCTL_WAIT_VBLANK32 DRM_IOWR(0x3a, drm_wait_vblank32_t)76 77#define DRM_IOCTL_MODE_ADDFB232 DRM_IOWR(0xb8, drm_mode_fb_cmd232_t)78 79typedef struct drm_version_32 {80 int version_major; /* Major version */81 int version_minor; /* Minor version */82 int version_patchlevel; /* Patch level */83 u32 name_len; /* Length of name buffer */84 u32 name; /* Name of driver */85 u32 date_len; /* Length of date buffer */86 u32 date; /* User-space buffer to hold date */87 u32 desc_len; /* Length of desc buffer */88 u32 desc; /* User-space buffer to hold desc */89} drm_version32_t;90 91static int compat_drm_version(struct file *file, unsigned int cmd,92 unsigned long arg)93{94 drm_version32_t v32;95 struct drm_version v;96 int err;97 98 if (copy_from_user(&v32, (void __user *)arg, sizeof(v32)))99 return -EFAULT;100 101 memset(&v, 0, sizeof(v));102 103 v = (struct drm_version) {104 .name_len = v32.name_len,105 .name = compat_ptr(v32.name),106 .date_len = v32.date_len,107 .date = compat_ptr(v32.date),108 .desc_len = v32.desc_len,109 .desc = compat_ptr(v32.desc),110 };111 err = drm_ioctl_kernel(file, drm_version, &v,112 DRM_RENDER_ALLOW);113 if (err)114 return err;115 116 v32.version_major = v.version_major;117 v32.version_minor = v.version_minor;118 v32.version_patchlevel = v.version_patchlevel;119 v32.name_len = v.name_len;120 v32.date_len = v.date_len;121 v32.desc_len = v.desc_len;122 if (copy_to_user((void __user *)arg, &v32, sizeof(v32)))123 return -EFAULT;124 return 0;125}126 127typedef struct drm_unique32 {128 u32 unique_len; /* Length of unique */129 u32 unique; /* Unique name for driver instantiation */130} drm_unique32_t;131 132static int compat_drm_getunique(struct file *file, unsigned int cmd,133 unsigned long arg)134{135 drm_unique32_t uq32;136 struct drm_unique uq;137 int err;138 139 if (copy_from_user(&uq32, (void __user *)arg, sizeof(uq32)))140 return -EFAULT;141 142 memset(&uq, 0, sizeof(uq));143 144 uq = (struct drm_unique){145 .unique_len = uq32.unique_len,146 .unique = compat_ptr(uq32.unique),147 };148 149 err = drm_ioctl_kernel(file, drm_getunique, &uq, 0);150 if (err)151 return err;152 153 uq32.unique_len = uq.unique_len;154 if (copy_to_user((void __user *)arg, &uq32, sizeof(uq32)))155 return -EFAULT;156 return 0;157}158 159static int compat_drm_setunique(struct file *file, unsigned int cmd,160 unsigned long arg)161{162 /* it's dead */163 return -EINVAL;164}165 166typedef struct drm_client32 {167 int idx; /* Which client desired? */168 int auth; /* Is client authenticated? */169 u32 pid; /* Process ID */170 u32 uid; /* User ID */171 u32 magic; /* Magic */172 u32 iocs; /* Ioctl count */173} drm_client32_t;174 175static int compat_drm_getclient(struct file *file, unsigned int cmd,176 unsigned long arg)177{178 drm_client32_t c32;179 drm_client32_t __user *argp = (void __user *)arg;180 struct drm_client client;181 int err;182 183 if (copy_from_user(&c32, argp, sizeof(c32)))184 return -EFAULT;185 186 memset(&client, 0, sizeof(client));187 188 client.idx = c32.idx;189 190 err = drm_ioctl_kernel(file, drm_getclient, &client, 0);191 if (err)192 return err;193 194 c32.idx = client.idx;195 c32.auth = client.auth;196 c32.pid = client.pid;197 c32.uid = client.uid;198 c32.magic = client.magic;199 c32.iocs = client.iocs;200 201 if (copy_to_user(argp, &c32, sizeof(c32)))202 return -EFAULT;203 return 0;204}205 206typedef struct drm_stats32 {207 u32 count;208 struct {209 u32 value;210 enum drm_stat_type type;211 } data[15];212} drm_stats32_t;213 214static int compat_drm_getstats(struct file *file, unsigned int cmd,215 unsigned long arg)216{217 drm_stats32_t __user *argp = (void __user *)arg;218 219 /* getstats is defunct, just clear */220 if (clear_user(argp, sizeof(drm_stats32_t)))221 return -EFAULT;222 return 0;223}224 225#if defined(CONFIG_X86)226typedef struct drm_update_draw32 {227 drm_drawable_t handle;228 unsigned int type;229 unsigned int num;230 /* 64-bit version has a 32-bit pad here */231 u64 data; /**< Pointer */232} __packed drm_update_draw32_t;233 234static int compat_drm_update_draw(struct file *file, unsigned int cmd,235 unsigned long arg)236{237 /* update_draw is defunct */238 return 0;239}240#endif241 242struct drm_wait_vblank_request32 {243 enum drm_vblank_seq_type type;244 unsigned int sequence;245 u32 signal;246};247 248struct drm_wait_vblank_reply32 {249 enum drm_vblank_seq_type type;250 unsigned int sequence;251 s32 tval_sec;252 s32 tval_usec;253};254 255typedef union drm_wait_vblank32 {256 struct drm_wait_vblank_request32 request;257 struct drm_wait_vblank_reply32 reply;258} drm_wait_vblank32_t;259 260static int compat_drm_wait_vblank(struct file *file, unsigned int cmd,261 unsigned long arg)262{263 drm_wait_vblank32_t __user *argp = (void __user *)arg;264 drm_wait_vblank32_t req32;265 union drm_wait_vblank req;266 int err;267 268 if (copy_from_user(&req32, argp, sizeof(req32)))269 return -EFAULT;270 271 memset(&req, 0, sizeof(req));272 273 req.request.type = req32.request.type;274 req.request.sequence = req32.request.sequence;275 req.request.signal = req32.request.signal;276 err = drm_ioctl_kernel(file, drm_wait_vblank_ioctl, &req, 0);277 278 req32.reply.type = req.reply.type;279 req32.reply.sequence = req.reply.sequence;280 req32.reply.tval_sec = req.reply.tval_sec;281 req32.reply.tval_usec = req.reply.tval_usec;282 if (copy_to_user(argp, &req32, sizeof(req32)))283 return -EFAULT;284 285 return err;286}287 288#if defined(CONFIG_X86)289typedef struct drm_mode_fb_cmd232 {290 u32 fb_id;291 u32 width;292 u32 height;293 u32 pixel_format;294 u32 flags;295 u32 handles[4];296 u32 pitches[4];297 u32 offsets[4];298 u64 modifier[4];299} __packed drm_mode_fb_cmd232_t;300 301static int compat_drm_mode_addfb2(struct file *file, unsigned int cmd,302 unsigned long arg)303{304 struct drm_mode_fb_cmd232 __user *argp = (void __user *)arg;305 struct drm_mode_fb_cmd2 req64;306 int err;307 308 memset(&req64, 0, sizeof(req64));309 310 if (copy_from_user(&req64, argp,311 offsetof(drm_mode_fb_cmd232_t, modifier)))312 return -EFAULT;313 314 if (copy_from_user(&req64.modifier, &argp->modifier,315 sizeof(req64.modifier)))316 return -EFAULT;317 318 err = drm_ioctl_kernel(file, drm_mode_addfb2, &req64, 0);319 if (err)320 return err;321 322 if (put_user(req64.fb_id, &argp->fb_id))323 return -EFAULT;324 325 return 0;326}327#endif328 329static struct {330 drm_ioctl_compat_t *fn;331 char *name;332} drm_compat_ioctls[] = {333#define DRM_IOCTL32_DEF(n, f) [DRM_IOCTL_NR(n##32)] = {.fn = f, .name = #n}334 DRM_IOCTL32_DEF(DRM_IOCTL_VERSION, compat_drm_version),335 DRM_IOCTL32_DEF(DRM_IOCTL_GET_UNIQUE, compat_drm_getunique),336 DRM_IOCTL32_DEF(DRM_IOCTL_GET_CLIENT, compat_drm_getclient),337 DRM_IOCTL32_DEF(DRM_IOCTL_GET_STATS, compat_drm_getstats),338 DRM_IOCTL32_DEF(DRM_IOCTL_SET_UNIQUE, compat_drm_setunique),339#if defined(CONFIG_X86)340 DRM_IOCTL32_DEF(DRM_IOCTL_UPDATE_DRAW, compat_drm_update_draw),341#endif342 DRM_IOCTL32_DEF(DRM_IOCTL_WAIT_VBLANK, compat_drm_wait_vblank),343#if defined(CONFIG_X86)344 DRM_IOCTL32_DEF(DRM_IOCTL_MODE_ADDFB2, compat_drm_mode_addfb2),345#endif346};347 348/**349 * drm_compat_ioctl - 32bit IOCTL compatibility handler for DRM drivers350 * @filp: file this ioctl is called on351 * @cmd: ioctl cmd number352 * @arg: user argument353 *354 * Compatibility handler for 32 bit userspace running on 64 kernels. All actual355 * IOCTL handling is forwarded to drm_ioctl(), while marshalling structures as356 * appropriate. Note that this only handles DRM core IOCTLs, if the driver has357 * botched IOCTL itself, it must handle those by wrapping this function.358 *359 * Returns:360 * Zero on success, negative error code on failure.361 */362long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)363{364 unsigned int nr = DRM_IOCTL_NR(cmd);365 struct drm_file *file_priv = filp->private_data;366 struct drm_device *dev = file_priv->minor->dev;367 drm_ioctl_compat_t *fn;368 int ret;369 370 /* Assume that ioctls without an explicit compat routine will just371 * work. This may not always be a good assumption, but it's better372 * than always failing.373 */374 if (nr >= ARRAY_SIZE(drm_compat_ioctls))375 return drm_ioctl(filp, cmd, arg);376 377 fn = drm_compat_ioctls[nr].fn;378 if (!fn)379 return drm_ioctl(filp, cmd, arg);380 381 drm_dbg_core(dev, "comm=\"%s\", pid=%d, dev=0x%lx, auth=%d, %s\n",382 current->comm, task_pid_nr(current),383 (long)old_encode_dev(file_priv->minor->kdev->devt),384 file_priv->authenticated,385 drm_compat_ioctls[nr].name);386 ret = (*fn)(filp, cmd, arg);387 if (ret)388 drm_dbg_core(dev, "ret = %d\n", ret);389 return ret;390}391EXPORT_SYMBOL(drm_compat_ioctl);392