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_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 79 typedef 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 91 static 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 } 126 127 typedef struct drm_unique32 { 128 u32 unique_len; /* Length of unique */ 129 u32 unique; /* Unique name for driver instantiation */ 130 } drm_unique32_t; 131 132 static 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 } 158 159 static int compat_drm_setunique(struct file *file, unsigned int cmd, 160 unsigned long arg) 161 { 162 /* it's dead */ 163 return -EINVAL; 164 } 165 166 typedef 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; 174 175 static 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 } 205 206 typedef struct drm_stats32 { 207 u32 count; 208 struct { 209 u32 value; 210 enum drm_stat_type type; 211 } data[15]; 212 } drm_stats32_t; 213 214 static 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) 226 typedef 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; 233 234 static 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 #endif 241 242 struct drm_wait_vblank_request32 { 243 enum drm_vblank_seq_type type; 244 unsigned int sequence; 245 u32 signal; 246 }; 247 248 struct drm_wait_vblank_reply32 { 249 enum drm_vblank_seq_type type; 250 unsigned int sequence; 251 s32 tval_sec; 252 s32 tval_usec; 253 }; 254 255 typedef union drm_wait_vblank32 { 256 struct drm_wait_vblank_request32 request; 257 struct drm_wait_vblank_reply32 reply; 258 } drm_wait_vblank32_t; 259 260 static 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) 289 typedef 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; 300 301 static 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 #endif 328 329 static 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 #endif 342 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 #endif 346 }; 347 348 /** 349 * drm_compat_ioctl - 32bit IOCTL compatibility handler for DRM drivers 350 * @filp: file this ioctl is called on 351 * @cmd: ioctl cmd number 352 * @arg: user argument 353 * 354 * Compatibility handler for 32 bit userspace running on 64 kernels. All actual 355 * IOCTL handling is forwarded to drm_ioctl(), while marshalling structures as 356 * appropriate. Note that this only handles DRM core IOCTLs, if the driver has 357 * botched IOCTL itself, it must handle those by wrapping this function. 358 * 359 * Returns: 360 * Zero on success, negative error code on failure. 361 */ 362 long 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 just 371 * work. This may not always be a good assumption, but it's better 372 * 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 } 391 EXPORT_SYMBOL(drm_compat_ioctl); 392