nouveau_usif.c revision 1.5.2.2
1 /* $NetBSD: nouveau_usif.c,v 1.5.2.2 2018/09/06 06:56:18 pgoyette 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 1.5.2.2 2018/09/06 06:56:18 pgoyette Exp $"); 29 30 #include "nouveau_drm.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_ON(1); 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; 143 144 if (nvif_unpack(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; 150 151 if (!(ntfy = kmalloc(sizeof(*ntfy), GFP_KERNEL))) 152 return -ENOMEM; 153 atomic_set(&ntfy->enabled, 0); 154 155 if (nvif_unpack(req->v0, 0, 0, true)) { 156 ntfy->reply = sizeof(struct nvif_notify_rep_v0) + req->v0.reply; 157 ntfy->route = req->v0.route; 158 ntfy->token = req->v0.token; 159 req->v0.route = NVDRM_NOTIFY_USIF; 160 req->v0.token = (unsigned long)(void *)ntfy; 161 ret = nvif_client_ioctl(client, argv, argc); 162 req->v0.token = ntfy->token; 163 req->v0.route = ntfy->route; 164 ntfy->handle = args->v0.index; 165 } 166 167 if (ret == 0) 168 list_add(&ntfy->head, &cli->notifys); 169 if (ret) 170 kfree(ntfy); 171 return ret; 172 } 173 174 static int 175 usif_notify_del(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 176 { 177 struct nouveau_cli *cli = nouveau_cli(f); 178 struct nvif_client *client = &cli->base; 179 union { 180 struct nvif_ioctl_ntfy_del_v0 v0; 181 } *args = data; 182 struct usif_notify *ntfy; 183 int ret; 184 185 if (nvif_unpack(args->v0, 0, 0, true)) { 186 if (!(ntfy = usif_notify_find(f, args->v0.index))) 187 return -ENOENT; 188 } else 189 return ret; 190 191 ret = nvif_client_ioctl(client, argv, argc); 192 if (ret == 0) 193 usif_notify_dtor(ntfy); 194 return ret; 195 } 196 197 static int 198 usif_notify_get(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 199 { 200 struct nouveau_cli *cli = nouveau_cli(f); 201 struct nvif_client *client = &cli->base; 202 union { 203 struct nvif_ioctl_ntfy_del_v0 v0; 204 } *args = data; 205 struct usif_notify *ntfy; 206 int ret; 207 208 if (nvif_unpack(args->v0, 0, 0, true)) { 209 if (!(ntfy = usif_notify_find(f, args->v0.index))) 210 return -ENOENT; 211 } else 212 return ret; 213 214 if (atomic_xchg(&ntfy->enabled, 1)) 215 return 0; 216 217 ntfy->p = kmalloc(sizeof(*ntfy->p) + ntfy->reply, GFP_KERNEL); 218 if (ret = -ENOMEM, !ntfy->p) 219 goto done; 220 ntfy->p->base.event = &ntfy->p->e.base; 221 ntfy->p->base.file_priv = f; 222 #ifdef __NetBSD__ 223 ntfy->p->base.pid = curproc->p_pid; 224 #else 225 ntfy->p->base.pid = current->pid; 226 #endif 227 ntfy->p->base.destroy =(void(*)(struct drm_pending_event *))kfree; 228 ntfy->p->e.base.type = DRM_NOUVEAU_EVENT_NVIF; 229 ntfy->p->e.base.length = sizeof(ntfy->p->e.base) + ntfy->reply; 230 231 ret = nvif_client_ioctl(client, argv, argc); 232 done: 233 if (ret) { 234 atomic_set(&ntfy->enabled, 0); 235 kfree(ntfy->p); 236 } 237 return ret; 238 } 239 240 static int 241 usif_notify_put(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 242 { 243 struct nouveau_cli *cli = nouveau_cli(f); 244 struct nvif_client *client = &cli->base; 245 union { 246 struct nvif_ioctl_ntfy_put_v0 v0; 247 } *args = data; 248 struct usif_notify *ntfy; 249 int ret; 250 251 if (nvif_unpack(args->v0, 0, 0, true)) { 252 if (!(ntfy = usif_notify_find(f, args->v0.index))) 253 return -ENOENT; 254 } else 255 return ret; 256 257 ret = nvif_client_ioctl(client, argv, argc); 258 if (ret == 0 && atomic_xchg(&ntfy->enabled, 0)) 259 kfree(ntfy->p); 260 return ret; 261 } 262 263 struct usif_object { 264 struct list_head head; 265 struct list_head ntfy; 266 u8 route; 267 u64 token; 268 }; 269 270 static void 271 usif_object_dtor(struct usif_object *object) 272 { 273 list_del(&object->head); 274 kfree(object); 275 } 276 277 static int 278 usif_object_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 279 { 280 struct nouveau_cli *cli = nouveau_cli(f); 281 struct nvif_client *client = &cli->base; 282 union { 283 struct nvif_ioctl_new_v0 v0; 284 } *args = data; 285 struct usif_object *object; 286 int ret; 287 288 if (!(object = kmalloc(sizeof(*object), GFP_KERNEL))) 289 return -ENOMEM; 290 list_add(&object->head, &cli->objects); 291 292 if (nvif_unpack(args->v0, 0, 0, true)) { 293 object->route = args->v0.route; 294 object->token = args->v0.token; 295 args->v0.route = NVDRM_OBJECT_USIF; 296 args->v0.token = (unsigned long)(void *)object; 297 ret = nvif_client_ioctl(client, argv, argc); 298 args->v0.token = object->token; 299 args->v0.route = object->route; 300 } 301 302 if (ret) 303 usif_object_dtor(object); 304 return ret; 305 } 306 307 int 308 usif_ioctl(struct drm_file *filp, void __user *user, u32 argc) 309 { 310 struct nouveau_cli *cli = nouveau_cli(filp); 311 struct nvif_client *client = &cli->base; 312 void *data = kmalloc(argc, GFP_KERNEL); 313 u32 size = argc; 314 union { 315 struct nvif_ioctl_v0 v0; 316 } *argv = data; 317 struct usif_object *object; 318 u8 owner; 319 int ret; 320 321 if (ret = -ENOMEM, !argv) 322 goto done; 323 if (ret = -EFAULT, copy_from_user(argv, user, size)) 324 goto done; 325 326 if (nvif_unpack(argv->v0, 0, 0, true)) { 327 /* block access to objects not created via this interface */ 328 owner = argv->v0.owner; 329 if (argv->v0.object == 0ULL && 330 argv->v0.type != NVIF_IOCTL_V0_DEL) 331 argv->v0.owner = NVDRM_OBJECT_ANY; /* except client */ 332 else 333 argv->v0.owner = NVDRM_OBJECT_USIF; 334 } else 335 goto done; 336 337 /* USIF slightly abuses some return-only ioctl members in order 338 * to provide interoperability with the older ABI16 objects 339 */ 340 mutex_lock(&cli->mutex); 341 if (argv->v0.route) { 342 if (ret = -EINVAL, argv->v0.route == 0xff) 343 ret = nouveau_abi16_usif(filp, argv, argc); 344 if (ret) { 345 mutex_unlock(&cli->mutex); 346 goto done; 347 } 348 } 349 350 switch (argv->v0.type) { 351 case NVIF_IOCTL_V0_NEW: 352 ret = usif_object_new(filp, data, size, argv, argc); 353 break; 354 case NVIF_IOCTL_V0_NTFY_NEW: 355 ret = usif_notify_new(filp, data, size, argv, argc); 356 break; 357 case NVIF_IOCTL_V0_NTFY_DEL: 358 ret = usif_notify_del(filp, data, size, argv, argc); 359 break; 360 case NVIF_IOCTL_V0_NTFY_GET: 361 ret = usif_notify_get(filp, data, size, argv, argc); 362 break; 363 case NVIF_IOCTL_V0_NTFY_PUT: 364 ret = usif_notify_put(filp, data, size, argv, argc); 365 break; 366 case NVIF_IOCTL_V0_MAP_NETBSD: 367 /* Kernel-only kludge. */ 368 ret = -EINVAL; 369 default: 370 ret = nvif_client_ioctl(client, argv, argc); 371 break; 372 } 373 if (argv->v0.route == NVDRM_OBJECT_USIF) { 374 object = (void *)(unsigned long)argv->v0.token; 375 argv->v0.route = object->route; 376 argv->v0.token = object->token; 377 if (ret == 0 && argv->v0.type == NVIF_IOCTL_V0_DEL) { 378 list_del(&object->head); 379 kfree(object); 380 } 381 } else { 382 argv->v0.route = NVIF_IOCTL_V0_ROUTE_HIDDEN; 383 argv->v0.token = 0; 384 } 385 argv->v0.owner = owner; 386 mutex_unlock(&cli->mutex); 387 388 if (copy_to_user(user, argv, argc)) 389 ret = -EFAULT; 390 done: 391 kfree(argv); 392 return ret; 393 } 394 395 void 396 usif_client_fini(struct nouveau_cli *cli) 397 { 398 struct usif_object *object, *otemp; 399 struct usif_notify *notify, *ntemp; 400 401 list_for_each_entry_safe(notify, ntemp, &cli->notifys, head) { 402 usif_notify_dtor(notify); 403 } 404 405 list_for_each_entry_safe(object, otemp, &cli->objects, head) { 406 usif_object_dtor(object); 407 } 408 } 409 410 void 411 usif_client_init(struct nouveau_cli *cli) 412 { 413 INIT_LIST_HEAD(&cli->objects); 414 INIT_LIST_HEAD(&cli->notifys); 415 } 416
Indexes created Thu Oct 23 22:10:10 GMT 2025