nouveau_usif.c revision 1.1.1.2
1 /* $NetBSD: nouveau_usif.c,v 1.1.1.2 2021/12/18 20:15:36 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 1.1.1.2 2021/12/18 20:15:36 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 wake_up_interruptible(&filp->event_wait); 121 spin_unlock_irqrestore(&dev->event_lock, flags); 122 atomic_set(&ntfy->enabled, 0); 123 return NVIF_NOTIFY_DROP; 124 } 125 126 static int 127 usif_notify_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 128 { 129 struct nouveau_cli *cli = nouveau_cli(f); 130 struct nvif_client *client = &cli->base; 131 union { 132 struct nvif_ioctl_ntfy_new_v0 v0; 133 } *args = data; 134 union { 135 struct nvif_notify_req_v0 v0; 136 } *req; 137 struct usif_notify *ntfy; 138 int ret = -ENOSYS; 139 140 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { 141 if (usif_notify_find(f, args->v0.index)) 142 return -EEXIST; 143 } else 144 return ret; 145 req = data; 146 ret = -ENOSYS; 147 148 if (!(ntfy = kmalloc(sizeof(*ntfy), GFP_KERNEL))) 149 return -ENOMEM; 150 atomic_set(&ntfy->enabled, 0); 151 152 if (!(ret = nvif_unpack(ret, &data, &size, req->v0, 0, 0, true))) { 153 ntfy->reply = sizeof(struct nvif_notify_rep_v0) + req->v0.reply; 154 ntfy->route = req->v0.route; 155 ntfy->token = req->v0.token; 156 req->v0.route = NVDRM_NOTIFY_USIF; 157 req->v0.token = (unsigned long)(void *)ntfy; 158 ret = nvif_client_ioctl(client, argv, argc); 159 req->v0.token = ntfy->token; 160 req->v0.route = ntfy->route; 161 ntfy->handle = args->v0.index; 162 } 163 164 if (ret == 0) 165 list_add(&ntfy->head, &cli->notifys); 166 if (ret) 167 kfree(ntfy); 168 return ret; 169 } 170 171 static int 172 usif_notify_del(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 173 { 174 struct nouveau_cli *cli = nouveau_cli(f); 175 struct nvif_client *client = &cli->base; 176 union { 177 struct nvif_ioctl_ntfy_del_v0 v0; 178 } *args = data; 179 struct usif_notify *ntfy; 180 int ret = -ENOSYS; 181 182 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { 183 if (!(ntfy = usif_notify_find(f, args->v0.index))) 184 return -ENOENT; 185 } else 186 return ret; 187 188 ret = nvif_client_ioctl(client, argv, argc); 189 if (ret == 0) 190 usif_notify_dtor(ntfy); 191 return ret; 192 } 193 194 static int 195 usif_notify_get(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 196 { 197 struct nouveau_cli *cli = nouveau_cli(f); 198 struct nvif_client *client = &cli->base; 199 union { 200 struct nvif_ioctl_ntfy_del_v0 v0; 201 } *args = data; 202 struct usif_notify *ntfy; 203 int ret = -ENOSYS; 204 205 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { 206 if (!(ntfy = usif_notify_find(f, args->v0.index))) 207 return -ENOENT; 208 } else 209 return ret; 210 211 if (atomic_xchg(&ntfy->enabled, 1)) 212 return 0; 213 214 ntfy->p = kmalloc(sizeof(*ntfy->p) + ntfy->reply, GFP_KERNEL); 215 if (ret = -ENOMEM, !ntfy->p) 216 goto done; 217 ntfy->p->base.event = &ntfy->p->e.base; 218 ntfy->p->base.file_priv = f; 219 ntfy->p->e.base.type = DRM_NOUVEAU_EVENT_NVIF; 220 ntfy->p->e.base.length = sizeof(ntfy->p->e.base) + ntfy->reply; 221 222 ret = nvif_client_ioctl(client, argv, argc); 223 done: 224 if (ret) { 225 atomic_set(&ntfy->enabled, 0); 226 kfree(ntfy->p); 227 } 228 return ret; 229 } 230 231 static int 232 usif_notify_put(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 233 { 234 struct nouveau_cli *cli = nouveau_cli(f); 235 struct nvif_client *client = &cli->base; 236 union { 237 struct nvif_ioctl_ntfy_put_v0 v0; 238 } *args = data; 239 struct usif_notify *ntfy; 240 int ret = -ENOSYS; 241 242 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { 243 if (!(ntfy = usif_notify_find(f, args->v0.index))) 244 return -ENOENT; 245 } else 246 return ret; 247 248 ret = nvif_client_ioctl(client, argv, argc); 249 if (ret == 0 && atomic_xchg(&ntfy->enabled, 0)) 250 kfree(ntfy->p); 251 return ret; 252 } 253 254 struct usif_object { 255 struct list_head head; 256 struct list_head ntfy; 257 u8 route; 258 u64 token; 259 }; 260 261 static void 262 usif_object_dtor(struct usif_object *object) 263 { 264 list_del(&object->head); 265 kfree(object); 266 } 267 268 static int 269 usif_object_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 270 { 271 struct nouveau_cli *cli = nouveau_cli(f); 272 struct nvif_client *client = &cli->base; 273 union { 274 struct nvif_ioctl_new_v0 v0; 275 } *args = data; 276 struct usif_object *object; 277 int ret = -ENOSYS; 278 279 if (!(object = kmalloc(sizeof(*object), GFP_KERNEL))) 280 return -ENOMEM; 281 list_add(&object->head, &cli->objects); 282 283 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { 284 object->route = args->v0.route; 285 object->token = args->v0.token; 286 args->v0.route = NVDRM_OBJECT_USIF; 287 args->v0.token = (unsigned long)(void *)object; 288 ret = nvif_client_ioctl(client, argv, argc); 289 args->v0.token = object->token; 290 args->v0.route = object->route; 291 } 292 293 if (ret) 294 usif_object_dtor(object); 295 return ret; 296 } 297 298 int 299 usif_ioctl(struct drm_file *filp, void __user *user, u32 argc) 300 { 301 struct nouveau_cli *cli = nouveau_cli(filp); 302 struct nvif_client *client = &cli->base; 303 void *data = kmalloc(argc, GFP_KERNEL); 304 u32 size = argc; 305 union { 306 struct nvif_ioctl_v0 v0; 307 } *argv = data; 308 struct usif_object *object; 309 u8 owner; 310 int ret; 311 312 if (ret = -ENOMEM, !argv) 313 goto done; 314 if (ret = -EFAULT, copy_from_user(argv, user, size)) 315 goto done; 316 317 if (!(ret = nvif_unpack(-ENOSYS, &data, &size, argv->v0, 0, 0, true))) { 318 /* block access to objects not created via this interface */ 319 owner = argv->v0.owner; 320 if (argv->v0.object == 0ULL && 321 argv->v0.type != NVIF_IOCTL_V0_DEL) 322 argv->v0.owner = NVDRM_OBJECT_ANY; /* except client */ 323 else 324 argv->v0.owner = NVDRM_OBJECT_USIF; 325 } else 326 goto done; 327 328 /* USIF slightly abuses some return-only ioctl members in order 329 * to provide interoperability with the older ABI16 objects 330 */ 331 mutex_lock(&cli->mutex); 332 if (argv->v0.route) { 333 if (ret = -EINVAL, argv->v0.route == 0xff) 334 ret = nouveau_abi16_usif(filp, argv, argc); 335 if (ret) { 336 mutex_unlock(&cli->mutex); 337 goto done; 338 } 339 } 340 341 switch (argv->v0.type) { 342 case NVIF_IOCTL_V0_NEW: 343 ret = usif_object_new(filp, data, size, argv, argc); 344 break; 345 case NVIF_IOCTL_V0_NTFY_NEW: 346 ret = usif_notify_new(filp, data, size, argv, argc); 347 break; 348 case NVIF_IOCTL_V0_NTFY_DEL: 349 ret = usif_notify_del(filp, data, size, argv, argc); 350 break; 351 case NVIF_IOCTL_V0_NTFY_GET: 352 ret = usif_notify_get(filp, data, size, argv, argc); 353 break; 354 case NVIF_IOCTL_V0_NTFY_PUT: 355 ret = usif_notify_put(filp, data, size, argv, argc); 356 break; 357 default: 358 ret = nvif_client_ioctl(client, argv, argc); 359 break; 360 } 361 if (argv->v0.route == NVDRM_OBJECT_USIF) { 362 object = (void *)(unsigned long)argv->v0.token; 363 argv->v0.route = object->route; 364 argv->v0.token = object->token; 365 if (ret == 0 && argv->v0.type == NVIF_IOCTL_V0_DEL) { 366 list_del(&object->head); 367 kfree(object); 368 } 369 } else { 370 argv->v0.route = NVIF_IOCTL_V0_ROUTE_HIDDEN; 371 argv->v0.token = 0; 372 } 373 argv->v0.owner = owner; 374 mutex_unlock(&cli->mutex); 375 376 if (copy_to_user(user, argv, argc)) 377 ret = -EFAULT; 378 done: 379 kfree(argv); 380 return ret; 381 } 382 383 void 384 usif_client_fini(struct nouveau_cli *cli) 385 { 386 struct usif_object *object, *otemp; 387 struct usif_notify *notify, *ntemp; 388 389 list_for_each_entry_safe(notify, ntemp, &cli->notifys, head) { 390 usif_notify_dtor(notify); 391 } 392 393 list_for_each_entry_safe(object, otemp, &cli->objects, head) { 394 usif_object_dtor(object); 395 } 396 } 397 398 void 399 usif_client_init(struct nouveau_cli *cli) 400 { 401 INIT_LIST_HEAD(&cli->objects); 402 INIT_LIST_HEAD(&cli->notifys); 403 } 404
Indexes created Thu Oct 23 22:10:10 GMT 2025