1 /* $NetBSD: nouveau_usif.c,v 1.8 2021/12/18 23:45:32 riastradh Exp $ */ 2 3 /* 4 * Copyright 2014 Red Hat Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: Ben Skeggs <bskeggs (at) redhat.com> 25 */ 26 27 #include <sys/cdefs.h> 28 __KERNEL_RCSID(0, "$NetBSD: nouveau_usif.c,v 1.8 2021/12/18 23:45:32 riastradh Exp $"); 29 30 #include "nouveau_drv.h" 31 #include "nouveau_usif.h" 32 #include "nouveau_abi16.h" 33 34 #include <nvif/notify.h> 35 #include <nvif/unpack.h> 36 #include <nvif/client.h> 37 #include <nvif/event.h> 38 #include <nvif/ioctl.h> 39 40 struct usif_notify_p { 41 struct drm_pending_event base; 42 struct { 43 struct drm_event base; 44 u8 data[]; 45 } e; 46 }; 47 48 struct usif_notify { 49 struct list_head head; 50 atomic_t enabled; 51 u32 handle; 52 u16 reply; 53 u8 route; 54 u64 token; 55 struct usif_notify_p *p; 56 }; 57 58 static inline struct usif_notify * 59 usif_notify_find(struct drm_file *filp, u32 handle) 60 { 61 struct nouveau_cli *cli = nouveau_cli(filp); 62 struct usif_notify *ntfy; 63 list_for_each_entry(ntfy, &cli->notifys, head) { 64 if (ntfy->handle == handle) 65 return ntfy; 66 } 67 return NULL; 68 } 69 70 static inline void 71 usif_notify_dtor(struct usif_notify *ntfy) 72 { 73 list_del(&ntfy->head); 74 kfree(ntfy); 75 } 76 77 int 78 usif_notify(const void *header, u32 length, const void *data, u32 size) 79 { 80 struct usif_notify *ntfy = NULL; 81 const union { 82 struct nvif_notify_rep_v0 v0; 83 } *rep = header; 84 struct drm_device *dev; 85 struct drm_file *filp; 86 unsigned long flags; 87 88 if (length == sizeof(rep->v0) && rep->v0.version == 0) { 89 if (WARN_ON(!(ntfy = (void *)(unsigned long)rep->v0.token))) 90 return NVIF_NOTIFY_DROP; 91 BUG_ON(rep->v0.route != NVDRM_NOTIFY_USIF); 92 } else 93 if (WARN_ON(1)) 94 return NVIF_NOTIFY_DROP; 95 96 if (WARN_ON(!ntfy->p || ntfy->reply != (length + size))) 97 return NVIF_NOTIFY_DROP; 98 filp = ntfy->p->base.file_priv; 99 dev = filp->minor->dev; 100 101 memcpy(&ntfy->p->e.data[0], header, length); 102 memcpy(&ntfy->p->e.data[length], data, size); 103 switch (rep->v0.version) { 104 case 0: { 105 struct nvif_notify_rep_v0 *rep = (void *)ntfy->p->e.data; 106 rep->route = ntfy->route; 107 rep->token = ntfy->token; 108 } 109 break; 110 default: 111 BUG(); 112 break; 113 } 114 115 spin_lock_irqsave(&dev->event_lock, flags); 116 if (!WARN_ON(filp->event_space < ntfy->p->e.base.length)) { 117 list_add_tail(&ntfy->p->base.link, &filp->event_list); 118 filp->event_space -= ntfy->p->e.base.length; 119 } 120 #ifdef __NetBSD__ 121 DRM_SPIN_WAKEUP_ONE(&filp->event_wait, &dev->event_lock); 122 #else 123 wake_up_interruptible(&filp->event_wait); 124 #endif 125 spin_unlock_irqrestore(&dev->event_lock, flags); 126 atomic_set(&ntfy->enabled, 0); 127 return NVIF_NOTIFY_DROP; 128 } 129 130 static int 131 usif_notify_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 132 { 133 struct nouveau_cli *cli = nouveau_cli(f); 134 struct nvif_client *client = &cli->base; 135 union { 136 struct nvif_ioctl_ntfy_new_v0 v0; 137 } *args = data; 138 union { 139 struct nvif_notify_req_v0 v0; 140 } *req; 141 struct usif_notify *ntfy; 142 int ret = -ENOSYS; 143 144 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { 145 if (usif_notify_find(f, args->v0.index)) 146 return -EEXIST; 147 } else 148 return ret; 149 req = data; 150 ret = -ENOSYS; 151 152 if (!(ntfy = kmalloc(sizeof(*ntfy), GFP_KERNEL))) 153 return -ENOMEM; 154 atomic_set(&ntfy->enabled, 0); 155 156 if (!(ret = nvif_unpack(ret, &data, &size, req->v0, 0, 0, true))) { 157 ntfy->reply = sizeof(struct nvif_notify_rep_v0) + req->v0.reply; 158 ntfy->route = req->v0.route; 159 ntfy->token = req->v0.token; 160 req->v0.route = NVDRM_NOTIFY_USIF; 161 req->v0.token = (unsigned long)(void *)ntfy; 162 ret = nvif_client_ioctl(client, argv, argc); 163 req->v0.token = ntfy->token; 164 req->v0.route = ntfy->route; 165 ntfy->handle = args->v0.index; 166 } 167 168 if (ret == 0) 169 list_add(&ntfy->head, &cli->notifys); 170 if (ret) 171 kfree(ntfy); 172 return ret; 173 } 174 175 static int 176 usif_notify_del(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 177 { 178 struct nouveau_cli *cli = nouveau_cli(f); 179 struct nvif_client *client = &cli->base; 180 union { 181 struct nvif_ioctl_ntfy_del_v0 v0; 182 } *args = data; 183 struct usif_notify *ntfy; 184 int ret = -ENOSYS; 185 186 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { 187 if (!(ntfy = usif_notify_find(f, args->v0.index))) 188 return -ENOENT; 189 } else 190 return ret; 191 192 ret = nvif_client_ioctl(client, argv, argc); 193 if (ret == 0) 194 usif_notify_dtor(ntfy); 195 return ret; 196 } 197 198 static int 199 usif_notify_get(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 200 { 201 struct nouveau_cli *cli = nouveau_cli(f); 202 struct nvif_client *client = &cli->base; 203 union { 204 struct nvif_ioctl_ntfy_del_v0 v0; 205 } *args = data; 206 struct usif_notify *ntfy; 207 int ret = -ENOSYS; 208 209 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { 210 if (!(ntfy = usif_notify_find(f, args->v0.index))) 211 return -ENOENT; 212 } else 213 return ret; 214 215 if (atomic_xchg(&ntfy->enabled, 1)) 216 return 0; 217 218 ntfy->p = kmalloc(sizeof(*ntfy->p) + ntfy->reply, GFP_KERNEL); 219 if (ret = -ENOMEM, !ntfy->p) 220 goto done; 221 ntfy->p->base.event = &ntfy->p->e.base; 222 ntfy->p->base.file_priv = f; 223 ntfy->p->e.base.type = DRM_NOUVEAU_EVENT_NVIF; 224 ntfy->p->e.base.length = sizeof(ntfy->p->e.base) + ntfy->reply; 225 226 ret = nvif_client_ioctl(client, argv, argc); 227 done: 228 if (ret) { 229 atomic_set(&ntfy->enabled, 0); 230 kfree(ntfy->p); 231 } 232 return ret; 233 } 234 235 static int 236 usif_notify_put(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 237 { 238 struct nouveau_cli *cli = nouveau_cli(f); 239 struct nvif_client *client = &cli->base; 240 union { 241 struct nvif_ioctl_ntfy_put_v0 v0; 242 } *args = data; 243 struct usif_notify *ntfy; 244 int ret = -ENOSYS; 245 246 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { 247 if (!(ntfy = usif_notify_find(f, args->v0.index))) 248 return -ENOENT; 249 } else 250 return ret; 251 252 ret = nvif_client_ioctl(client, argv, argc); 253 if (ret == 0 && atomic_xchg(&ntfy->enabled, 0)) 254 kfree(ntfy->p); 255 return ret; 256 } 257 258 struct usif_object { 259 struct list_head head; 260 struct list_head ntfy; 261 u8 route; 262 u64 token; 263 }; 264 265 static void 266 usif_object_dtor(struct usif_object *object) 267 { 268 list_del(&object->head); 269 kfree(object); 270 } 271 272 static int 273 usif_object_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 274 { 275 struct nouveau_cli *cli = nouveau_cli(f); 276 struct nvif_client *client = &cli->base; 277 union { 278 struct nvif_ioctl_new_v0 v0; 279 } *args = data; 280 struct usif_object *object; 281 int ret = -ENOSYS; 282 283 if (!(object = kmalloc(sizeof(*object), GFP_KERNEL))) 284 return -ENOMEM; 285 list_add(&object->head, &cli->objects); 286 287 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { 288 object->route = args->v0.route; 289 object->token = args->v0.token; 290 args->v0.route = NVDRM_OBJECT_USIF; 291 args->v0.token = (unsigned long)(void *)object; 292 ret = nvif_client_ioctl(client, argv, argc); 293 args->v0.token = object->token; 294 args->v0.route = object->route; 295 } 296 297 if (ret) 298 usif_object_dtor(object); 299 return ret; 300 } 301 302 int 303 #ifdef __NetBSD__ 304 usif_ioctl(struct drm_file *filp, void *data, u32 argc) 305 #else 306 usif_ioctl(struct drm_file *filp, void __user *user, u32 argc) 307 #endif 308 { 309 struct nouveau_cli *cli = nouveau_cli(filp); 310 struct nvif_client *client = &cli->base; 311 #ifndef __NetBSD__ 312 void *data = kmalloc(argc, GFP_KERNEL); 313 #endif 314 u32 size = argc; 315 union { 316 struct nvif_ioctl_v0 v0; 317 } *argv = data; 318 struct usif_object *object; 319 u8 owner; 320 int ret; 321 322 #ifndef __NetBSD__ 323 if (ret = -ENOMEM, !argv) 324 goto done; 325 if (ret = -EFAULT, copy_from_user(argv, user, size)) 326 goto done; 327 #endif 328 329 if (!(ret = nvif_unpack(-ENOSYS, &data, &size, argv->v0, 0, 0, true))) { 330 /* block access to objects not created via this interface */ 331 owner = argv->v0.owner; 332 if (argv->v0.object == 0ULL && 333 argv->v0.type != NVIF_IOCTL_V0_DEL) 334 argv->v0.owner = NVDRM_OBJECT_ANY; /* except client */ 335 else 336 argv->v0.owner = NVDRM_OBJECT_USIF; 337 } else 338 goto done; 339 340 /* USIF slightly abuses some return-only ioctl members in order 341 * to provide interoperability with the older ABI16 objects 342 */ 343 mutex_lock(&cli->mutex); 344 if (argv->v0.route) { 345 if (ret = -EINVAL, argv->v0.route == 0xff) 346 ret = nouveau_abi16_usif(filp, argv, argc); 347 if (ret) { 348 mutex_unlock(&cli->mutex); 349 goto done; 350 } 351 } 352 353 switch (argv->v0.type) { 354 case NVIF_IOCTL_V0_NEW: 355 ret = usif_object_new(filp, data, size, argv, argc); 356 break; 357 case NVIF_IOCTL_V0_NTFY_NEW: 358 ret = usif_notify_new(filp, data, size, argv, argc); 359 break; 360 case NVIF_IOCTL_V0_NTFY_DEL: 361 ret = usif_notify_del(filp, data, size, argv, argc); 362 break; 363 case NVIF_IOCTL_V0_NTFY_GET: 364 ret = usif_notify_get(filp, data, size, argv, argc); 365 break; 366 case NVIF_IOCTL_V0_NTFY_PUT: 367 ret = usif_notify_put(filp, data, size, argv, argc); 368 break; 369 case NVIF_IOCTL_V0_MAP_NETBSD: 370 /* Kernel-only kludge. */ 371 ret = -EINVAL; 372 break; 373 default: 374 ret = nvif_client_ioctl(client, argv, argc); 375 break; 376 } 377 if (argv->v0.route == NVDRM_OBJECT_USIF) { 378 object = (void *)(unsigned long)argv->v0.token; 379 argv->v0.route = object->route; 380 argv->v0.token = object->token; 381 if (ret == 0 && argv->v0.type == NVIF_IOCTL_V0_DEL) { 382 list_del(&object->head); 383 kfree(object); 384 } 385 } else { 386 argv->v0.route = NVIF_IOCTL_V0_ROUTE_HIDDEN; 387 argv->v0.token = 0; 388 } 389 argv->v0.owner = owner; 390 mutex_unlock(&cli->mutex); 391 392 #ifndef __NetBSD__ 393 if (copy_to_user(user, argv, argc)) 394 ret = -EFAULT; 395 #endif 396 done: 397 #ifndef __NetBSD__ 398 kfree(argv); 399 #endif 400 return ret; 401 } 402 403 void 404 usif_client_fini(struct nouveau_cli *cli) 405 { 406 struct usif_object *object, *otemp; 407 struct usif_notify *notify, *ntemp; 408 409 list_for_each_entry_safe(notify, ntemp, &cli->notifys, head) { 410 usif_notify_dtor(notify); 411 } 412 413 list_for_each_entry_safe(object, otemp, &cli->objects, head) { 414 usif_object_dtor(object); 415 } 416 } 417 418 void 419 usif_client_init(struct nouveau_cli *cli) 420 { 421 INIT_LIST_HEAD(&cli->objects); 422 INIT_LIST_HEAD(&cli->notifys); 423 } 424
Indexes created Mon Sep 22 10:09:38 GMT 2025