nouveau_usif.c revision 1.3
1 /* $NetBSD: nouveau_usif.c,v 1.3 2018/08/27 07:35:56 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 1.3 2018/08/27 07:35:56 riastradh 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 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; 139 140 if (nvif_unpack(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; 146 147 if (!(ntfy = kmalloc(sizeof(*ntfy), GFP_KERNEL))) 148 return -ENOMEM; 149 atomic_set(&ntfy->enabled, 0); 150 151 if (nvif_unpack(req->v0, 0, 0, true)) { 152 ntfy->reply = sizeof(struct nvif_notify_rep_v0) + req->v0.reply; 153 ntfy->route = req->v0.route; 154 ntfy->token = req->v0.token; 155 req->v0.route = NVDRM_NOTIFY_USIF; 156 req->v0.token = (unsigned long)(void *)ntfy; 157 ret = nvif_client_ioctl(client, argv, argc); 158 req->v0.token = ntfy->token; 159 req->v0.route = ntfy->route; 160 ntfy->handle = args->v0.index; 161 } 162 163 if (ret == 0) 164 list_add(&ntfy->head, &cli->notifys); 165 if (ret) 166 kfree(ntfy); 167 return ret; 168 } 169 170 static int 171 usif_notify_del(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 172 { 173 struct nouveau_cli *cli = nouveau_cli(f); 174 struct nvif_client *client = &cli->base; 175 union { 176 struct nvif_ioctl_ntfy_del_v0 v0; 177 } *args = data; 178 struct usif_notify *ntfy; 179 int ret; 180 181 if (nvif_unpack(args->v0, 0, 0, true)) { 182 if (!(ntfy = usif_notify_find(f, args->v0.index))) 183 return -ENOENT; 184 } else 185 return ret; 186 187 ret = nvif_client_ioctl(client, argv, argc); 188 if (ret == 0) 189 usif_notify_dtor(ntfy); 190 return ret; 191 } 192 193 static int 194 usif_notify_get(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 195 { 196 struct nouveau_cli *cli = nouveau_cli(f); 197 struct nvif_client *client = &cli->base; 198 union { 199 struct nvif_ioctl_ntfy_del_v0 v0; 200 } *args = data; 201 struct usif_notify *ntfy; 202 int ret; 203 204 if (nvif_unpack(args->v0, 0, 0, true)) { 205 if (!(ntfy = usif_notify_find(f, args->v0.index))) 206 return -ENOENT; 207 } else 208 return ret; 209 210 if (atomic_xchg(&ntfy->enabled, 1)) 211 return 0; 212 213 ntfy->p = kmalloc(sizeof(*ntfy->p) + ntfy->reply, GFP_KERNEL); 214 if (ret = -ENOMEM, !ntfy->p) 215 goto done; 216 ntfy->p->base.event = &ntfy->p->e.base; 217 ntfy->p->base.file_priv = f; 218 ntfy->p->base.pid = current->pid; 219 ntfy->p->base.destroy =(void(*)(struct drm_pending_event *))kfree; 220 ntfy->p->e.base.type = DRM_NOUVEAU_EVENT_NVIF; 221 ntfy->p->e.base.length = sizeof(ntfy->p->e.base) + ntfy->reply; 222 223 ret = nvif_client_ioctl(client, argv, argc); 224 done: 225 if (ret) { 226 atomic_set(&ntfy->enabled, 0); 227 kfree(ntfy->p); 228 } 229 return ret; 230 } 231 232 static int 233 usif_notify_put(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 234 { 235 struct nouveau_cli *cli = nouveau_cli(f); 236 struct nvif_client *client = &cli->base; 237 union { 238 struct nvif_ioctl_ntfy_put_v0 v0; 239 } *args = data; 240 struct usif_notify *ntfy; 241 int ret; 242 243 if (nvif_unpack(args->v0, 0, 0, true)) { 244 if (!(ntfy = usif_notify_find(f, args->v0.index))) 245 return -ENOENT; 246 } else 247 return ret; 248 249 ret = nvif_client_ioctl(client, argv, argc); 250 if (ret == 0 && atomic_xchg(&ntfy->enabled, 0)) 251 kfree(ntfy->p); 252 return ret; 253 } 254 255 struct usif_object { 256 struct list_head head; 257 struct list_head ntfy; 258 u8 route; 259 u64 token; 260 }; 261 262 static void 263 usif_object_dtor(struct usif_object *object) 264 { 265 list_del(&object->head); 266 kfree(object); 267 } 268 269 static int 270 usif_object_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) 271 { 272 struct nouveau_cli *cli = nouveau_cli(f); 273 struct nvif_client *client = &cli->base; 274 union { 275 struct nvif_ioctl_new_v0 v0; 276 } *args = data; 277 struct usif_object *object; 278 int ret; 279 280 if (!(object = kmalloc(sizeof(*object), GFP_KERNEL))) 281 return -ENOMEM; 282 list_add(&object->head, &cli->objects); 283 284 if (nvif_unpack(args->v0, 0, 0, true)) { 285 object->route = args->v0.route; 286 object->token = args->v0.token; 287 args->v0.route = NVDRM_OBJECT_USIF; 288 args->v0.token = (unsigned long)(void *)object; 289 ret = nvif_client_ioctl(client, argv, argc); 290 args->v0.token = object->token; 291 args->v0.route = object->route; 292 } 293 294 if (ret) 295 usif_object_dtor(object); 296 return ret; 297 } 298 299 int 300 usif_ioctl(struct drm_file *filp, void __user *user, u32 argc) 301 { 302 struct nouveau_cli *cli = nouveau_cli(filp); 303 struct nvif_client *client = &cli->base; 304 void *data = kmalloc(argc, GFP_KERNEL); 305 u32 size = argc; 306 union { 307 struct nvif_ioctl_v0 v0; 308 } *argv = data; 309 struct usif_object *object; 310 u8 owner; 311 int ret; 312 313 if (ret = -ENOMEM, !argv) 314 goto done; 315 if (ret = -EFAULT, copy_from_user(argv, user, size)) 316 goto done; 317 318 if (nvif_unpack(argv->v0, 0, 0, true)) { 319 /* block access to objects not created via this interface */ 320 owner = argv->v0.owner; 321 if (argv->v0.object == 0ULL && 322 argv->v0.type != NVIF_IOCTL_V0_DEL) 323 argv->v0.owner = NVDRM_OBJECT_ANY; /* except client */ 324 else 325 argv->v0.owner = NVDRM_OBJECT_USIF; 326 } else 327 goto done; 328 329 /* USIF slightly abuses some return-only ioctl members in order 330 * to provide interoperability with the older ABI16 objects 331 */ 332 mutex_lock(&cli->mutex); 333 if (argv->v0.route) { 334 if (ret = -EINVAL, argv->v0.route == 0xff) 335 ret = nouveau_abi16_usif(filp, argv, argc); 336 if (ret) { 337 mutex_unlock(&cli->mutex); 338 goto done; 339 } 340 } 341 342 switch (argv->v0.type) { 343 case NVIF_IOCTL_V0_NEW: 344 ret = usif_object_new(filp, data, size, argv, argc); 345 break; 346 case NVIF_IOCTL_V0_NTFY_NEW: 347 ret = usif_notify_new(filp, data, size, argv, argc); 348 break; 349 case NVIF_IOCTL_V0_NTFY_DEL: 350 ret = usif_notify_del(filp, data, size, argv, argc); 351 break; 352 case NVIF_IOCTL_V0_NTFY_GET: 353 ret = usif_notify_get(filp, data, size, argv, argc); 354 break; 355 case NVIF_IOCTL_V0_NTFY_PUT: 356 ret = usif_notify_put(filp, data, size, argv, argc); 357 break; 358 case NVIF_IOCTL_V0_MAP_NETBSD: 359 /* Kernel-only kludge. */ 360 ret = -EINVAL; 361 default: 362 ret = nvif_client_ioctl(client, argv, argc); 363 break; 364 } 365 if (argv->v0.route == NVDRM_OBJECT_USIF) { 366 object = (void *)(unsigned long)argv->v0.token; 367 argv->v0.route = object->route; 368 argv->v0.token = object->token; 369 if (ret == 0 && argv->v0.type == NVIF_IOCTL_V0_DEL) { 370 list_del(&object->head); 371 kfree(object); 372 } 373 } else { 374 argv->v0.route = NVIF_IOCTL_V0_ROUTE_HIDDEN; 375 argv->v0.token = 0; 376 } 377 argv->v0.owner = owner; 378 mutex_unlock(&cli->mutex); 379 380 if (copy_to_user(user, argv, argc)) 381 ret = -EFAULT; 382 done: 383 kfree(argv); 384 return ret; 385 } 386 387 void 388 usif_client_fini(struct nouveau_cli *cli) 389 { 390 struct usif_object *object, *otemp; 391 struct usif_notify *notify, *ntemp; 392 393 list_for_each_entry_safe(notify, ntemp, &cli->notifys, head) { 394 usif_notify_dtor(notify); 395 } 396 397 list_for_each_entry_safe(object, otemp, &cli->objects, head) { 398 usif_object_dtor(object); 399 } 400 } 401 402 void 403 usif_client_init(struct nouveau_cli *cli) 404 { 405 INIT_LIST_HEAD(&cli->objects); 406 INIT_LIST_HEAD(&cli->notifys); 407 } 408
Indexes created Sun Oct 26 21:10:03 GMT 2025