Ben Skeggs | 27111a2 | 2014-08-10 04:10:31 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 Red Hat Inc. |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | * copy of this software and associated documentation files (the "Software"), |
| 6 | * to deal in the Software without restriction, including without limitation |
| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | * Software is furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice shall be included in |
| 12 | * all copies or substantial portions of the Software. |
| 13 | * |
| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 17 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 18 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| 20 | * OTHER DEALINGS IN THE SOFTWARE. |
| 21 | * |
| 22 | * Authors: Ben Skeggs <bskeggs@redhat.com> |
| 23 | */ |
| 24 | |
| 25 | #include "nouveau_drm.h" |
| 26 | #include "nouveau_usif.h" |
| 27 | |
| 28 | #include <nvif/notify.h> |
| 29 | #include <nvif/unpack.h> |
| 30 | #include <nvif/client.h> |
| 31 | #include <nvif/event.h> |
| 32 | #include <nvif/ioctl.h> |
| 33 | |
| 34 | struct usif_notify_p { |
| 35 | struct drm_pending_event base; |
| 36 | struct { |
| 37 | struct drm_event base; |
| 38 | u8 data[]; |
| 39 | } e; |
| 40 | }; |
| 41 | |
| 42 | struct usif_notify { |
| 43 | struct list_head head; |
| 44 | atomic_t enabled; |
| 45 | u32 handle; |
| 46 | u16 reply; |
| 47 | u8 route; |
| 48 | u64 token; |
| 49 | struct usif_notify_p *p; |
| 50 | }; |
| 51 | |
| 52 | static inline struct usif_notify * |
| 53 | usif_notify_find(struct drm_file *filp, u32 handle) |
| 54 | { |
| 55 | struct nouveau_cli *cli = nouveau_cli(filp); |
| 56 | struct usif_notify *ntfy; |
| 57 | list_for_each_entry(ntfy, &cli->notifys, head) { |
| 58 | if (ntfy->handle == handle) |
| 59 | return ntfy; |
| 60 | } |
| 61 | return NULL; |
| 62 | } |
| 63 | |
| 64 | static inline void |
| 65 | usif_notify_dtor(struct usif_notify *ntfy) |
| 66 | { |
| 67 | list_del(&ntfy->head); |
| 68 | kfree(ntfy); |
| 69 | } |
| 70 | |
| 71 | int |
| 72 | usif_notify(const void *header, u32 length, const void *data, u32 size) |
| 73 | { |
| 74 | struct usif_notify *ntfy = NULL; |
| 75 | const union { |
| 76 | struct nvif_notify_rep_v0 v0; |
| 77 | } *rep = header; |
| 78 | struct drm_device *dev; |
| 79 | struct drm_file *filp; |
| 80 | unsigned long flags; |
| 81 | |
| 82 | if (length == sizeof(rep->v0) && rep->v0.version == 0) { |
| 83 | if (WARN_ON(!(ntfy = (void *)(unsigned long)rep->v0.token))) |
| 84 | return NVIF_NOTIFY_DROP; |
| 85 | BUG_ON(rep->v0.route != NVDRM_NOTIFY_USIF); |
| 86 | } else |
| 87 | if (WARN_ON(1)) |
| 88 | return NVIF_NOTIFY_DROP; |
| 89 | |
| 90 | if (WARN_ON(!ntfy->p || ntfy->reply != (length + size))) |
| 91 | return NVIF_NOTIFY_DROP; |
| 92 | filp = ntfy->p->base.file_priv; |
| 93 | dev = filp->minor->dev; |
| 94 | |
| 95 | memcpy(&ntfy->p->e.data[0], header, length); |
| 96 | memcpy(&ntfy->p->e.data[length], data, size); |
| 97 | switch (rep->v0.version) { |
| 98 | case 0: { |
| 99 | struct nvif_notify_rep_v0 *rep = (void *)ntfy->p->e.data; |
| 100 | rep->route = ntfy->route; |
| 101 | rep->token = ntfy->token; |
| 102 | } |
| 103 | break; |
| 104 | default: |
| 105 | BUG_ON(1); |
| 106 | break; |
| 107 | } |
| 108 | |
| 109 | spin_lock_irqsave(&dev->event_lock, flags); |
| 110 | if (!WARN_ON(filp->event_space < ntfy->p->e.base.length)) { |
| 111 | list_add_tail(&ntfy->p->base.link, &filp->event_list); |
| 112 | filp->event_space -= ntfy->p->e.base.length; |
| 113 | } |
| 114 | wake_up_interruptible(&filp->event_wait); |
| 115 | spin_unlock_irqrestore(&dev->event_lock, flags); |
| 116 | atomic_set(&ntfy->enabled, 0); |
| 117 | return NVIF_NOTIFY_DROP; |
| 118 | } |
| 119 | |
| 120 | static int |
| 121 | usif_notify_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) |
| 122 | { |
| 123 | struct nouveau_cli *cli = nouveau_cli(f); |
| 124 | struct nvif_client *client = &cli->base; |
| 125 | union { |
| 126 | struct nvif_ioctl_ntfy_new_v0 v0; |
| 127 | } *args = data; |
| 128 | union { |
| 129 | struct nvif_notify_req_v0 v0; |
| 130 | } *req; |
| 131 | struct usif_notify *ntfy; |
| 132 | int ret; |
| 133 | |
| 134 | if (nvif_unpack(args->v0, 0, 0, true)) { |
| 135 | if (usif_notify_find(f, args->v0.index)) |
| 136 | return -EEXIST; |
| 137 | } else |
| 138 | return ret; |
| 139 | req = data; |
| 140 | |
| 141 | if (!(ntfy = kmalloc(sizeof(*ntfy), GFP_KERNEL))) |
| 142 | return -ENOMEM; |
| 143 | atomic_set(&ntfy->enabled, 0); |
| 144 | |
| 145 | if (nvif_unpack(req->v0, 0, 0, true)) { |
| 146 | ntfy->reply = sizeof(struct nvif_notify_rep_v0) + req->v0.reply; |
| 147 | ntfy->route = req->v0.route; |
| 148 | ntfy->token = req->v0.token; |
| 149 | req->v0.route = NVDRM_NOTIFY_USIF; |
| 150 | req->v0.token = (unsigned long)(void *)ntfy; |
| 151 | ret = nvif_client_ioctl(client, argv, argc); |
| 152 | req->v0.token = ntfy->token; |
| 153 | req->v0.route = ntfy->route; |
| 154 | ntfy->handle = args->v0.index; |
| 155 | } |
| 156 | |
| 157 | if (ret == 0) |
| 158 | list_add(&ntfy->head, &cli->notifys); |
| 159 | if (ret) |
| 160 | kfree(ntfy); |
| 161 | return ret; |
| 162 | } |
| 163 | |
| 164 | static int |
| 165 | usif_notify_del(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) |
| 166 | { |
| 167 | struct nouveau_cli *cli = nouveau_cli(f); |
| 168 | struct nvif_client *client = &cli->base; |
| 169 | union { |
| 170 | struct nvif_ioctl_ntfy_del_v0 v0; |
| 171 | } *args = data; |
| 172 | struct usif_notify *ntfy; |
| 173 | int ret; |
| 174 | |
| 175 | if (nvif_unpack(args->v0, 0, 0, true)) { |
| 176 | if (!(ntfy = usif_notify_find(f, args->v0.index))) |
| 177 | return -ENOENT; |
| 178 | } else |
| 179 | return ret; |
| 180 | |
| 181 | ret = nvif_client_ioctl(client, argv, argc); |
| 182 | if (ret == 0) |
| 183 | usif_notify_dtor(ntfy); |
| 184 | return ret; |
| 185 | } |
| 186 | |
| 187 | static int |
| 188 | usif_notify_get(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) |
| 189 | { |
| 190 | struct nouveau_cli *cli = nouveau_cli(f); |
| 191 | struct nvif_client *client = &cli->base; |
| 192 | union { |
| 193 | struct nvif_ioctl_ntfy_del_v0 v0; |
| 194 | } *args = data; |
| 195 | struct usif_notify *ntfy; |
| 196 | int ret; |
| 197 | |
| 198 | if (nvif_unpack(args->v0, 0, 0, true)) { |
| 199 | if (!(ntfy = usif_notify_find(f, args->v0.index))) |
| 200 | return -ENOENT; |
| 201 | } else |
| 202 | return ret; |
| 203 | |
| 204 | if (atomic_xchg(&ntfy->enabled, 1)) |
| 205 | return 0; |
| 206 | |
| 207 | ntfy->p = kmalloc(sizeof(*ntfy->p) + ntfy->reply, GFP_KERNEL); |
| 208 | if (ret = -ENOMEM, !ntfy->p) |
| 209 | goto done; |
| 210 | ntfy->p->base.event = &ntfy->p->e.base; |
| 211 | ntfy->p->base.file_priv = f; |
| 212 | ntfy->p->base.pid = current->pid; |
| 213 | ntfy->p->base.destroy =(void(*)(struct drm_pending_event *))kfree; |
| 214 | ntfy->p->e.base.type = DRM_NOUVEAU_EVENT_NVIF; |
| 215 | ntfy->p->e.base.length = sizeof(ntfy->p->e.base) + ntfy->reply; |
| 216 | |
| 217 | ret = nvif_client_ioctl(client, argv, argc); |
| 218 | done: |
| 219 | if (ret) { |
| 220 | atomic_set(&ntfy->enabled, 0); |
| 221 | kfree(ntfy->p); |
| 222 | } |
| 223 | return ret; |
| 224 | } |
| 225 | |
| 226 | static int |
| 227 | usif_notify_put(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) |
| 228 | { |
| 229 | struct nouveau_cli *cli = nouveau_cli(f); |
| 230 | struct nvif_client *client = &cli->base; |
| 231 | union { |
| 232 | struct nvif_ioctl_ntfy_put_v0 v0; |
| 233 | } *args = data; |
| 234 | struct usif_notify *ntfy; |
| 235 | int ret; |
| 236 | |
| 237 | if (nvif_unpack(args->v0, 0, 0, true)) { |
| 238 | if (!(ntfy = usif_notify_find(f, args->v0.index))) |
| 239 | return -ENOENT; |
| 240 | } else |
| 241 | return ret; |
| 242 | |
| 243 | ret = nvif_client_ioctl(client, argv, argc); |
| 244 | if (ret == 0 && atomic_xchg(&ntfy->enabled, 0)) |
| 245 | kfree(ntfy->p); |
| 246 | return ret; |
| 247 | } |
| 248 | |
| 249 | struct usif_object { |
| 250 | struct list_head head; |
| 251 | struct list_head ntfy; |
| 252 | u8 route; |
| 253 | u64 token; |
| 254 | }; |
| 255 | |
| 256 | static void |
| 257 | usif_object_dtor(struct usif_object *object) |
| 258 | { |
| 259 | list_del(&object->head); |
| 260 | kfree(object); |
| 261 | } |
| 262 | |
| 263 | static int |
| 264 | usif_object_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) |
| 265 | { |
| 266 | struct nouveau_cli *cli = nouveau_cli(f); |
| 267 | struct nvif_client *client = &cli->base; |
| 268 | union { |
| 269 | struct nvif_ioctl_new_v0 v0; |
| 270 | } *args = data; |
| 271 | struct usif_object *object; |
| 272 | int ret; |
| 273 | |
| 274 | if (!(object = kmalloc(sizeof(*object), GFP_KERNEL))) |
| 275 | return -ENOMEM; |
| 276 | list_add(&object->head, &cli->objects); |
| 277 | |
| 278 | if (nvif_unpack(args->v0, 0, 0, true)) { |
| 279 | object->route = args->v0.route; |
| 280 | object->token = args->v0.token; |
| 281 | args->v0.route = NVDRM_OBJECT_USIF; |
| 282 | args->v0.token = (unsigned long)(void *)object; |
| 283 | ret = nvif_client_ioctl(client, argv, argc); |
| 284 | args->v0.token = object->token; |
| 285 | args->v0.route = object->route; |
| 286 | } |
| 287 | |
| 288 | if (ret) |
| 289 | usif_object_dtor(object); |
| 290 | return ret; |
| 291 | } |
| 292 | |
| 293 | int |
| 294 | usif_ioctl(struct drm_file *filp, void __user *user, u32 argc) |
| 295 | { |
| 296 | struct nouveau_cli *cli = nouveau_cli(filp); |
| 297 | struct nvif_client *client = &cli->base; |
| 298 | void *data = kmalloc(argc, GFP_KERNEL); |
| 299 | u32 size = argc; |
| 300 | union { |
| 301 | struct nvif_ioctl_v0 v0; |
| 302 | } *argv = data; |
| 303 | struct usif_object *object; |
| 304 | u8 owner; |
| 305 | int ret; |
| 306 | |
| 307 | if (ret = -ENOMEM, !argv) |
| 308 | goto done; |
| 309 | if (ret = -EFAULT, copy_from_user(argv, user, size)) |
| 310 | goto done; |
| 311 | |
| 312 | if (nvif_unpack(argv->v0, 0, 0, true)) { |
| 313 | /* block access to objects not created via this interface */ |
| 314 | owner = argv->v0.owner; |
| 315 | argv->v0.owner = NVDRM_OBJECT_USIF; |
| 316 | } else |
| 317 | goto done; |
| 318 | |
| 319 | mutex_lock(&cli->mutex); |
| 320 | switch (argv->v0.type) { |
| 321 | case NVIF_IOCTL_V0_NEW: |
| 322 | /* ... except if we're creating children */ |
| 323 | argv->v0.owner = NVIF_IOCTL_V0_OWNER_ANY; |
| 324 | ret = usif_object_new(filp, data, size, argv, argc); |
| 325 | break; |
| 326 | case NVIF_IOCTL_V0_NTFY_NEW: |
| 327 | ret = usif_notify_new(filp, data, size, argv, argc); |
| 328 | break; |
| 329 | case NVIF_IOCTL_V0_NTFY_DEL: |
| 330 | ret = usif_notify_del(filp, data, size, argv, argc); |
| 331 | break; |
| 332 | case NVIF_IOCTL_V0_NTFY_GET: |
| 333 | ret = usif_notify_get(filp, data, size, argv, argc); |
| 334 | break; |
| 335 | case NVIF_IOCTL_V0_NTFY_PUT: |
| 336 | ret = usif_notify_put(filp, data, size, argv, argc); |
| 337 | break; |
| 338 | default: |
| 339 | ret = nvif_client_ioctl(client, argv, argc); |
| 340 | break; |
| 341 | } |
| 342 | if (argv->v0.route == NVDRM_OBJECT_USIF) { |
| 343 | object = (void *)(unsigned long)argv->v0.token; |
| 344 | argv->v0.route = object->route; |
| 345 | argv->v0.token = object->token; |
| 346 | if (ret == 0 && argv->v0.type == NVIF_IOCTL_V0_DEL) { |
| 347 | list_del(&object->head); |
| 348 | kfree(object); |
| 349 | } |
| 350 | } else { |
| 351 | argv->v0.route = NVIF_IOCTL_V0_ROUTE_HIDDEN; |
| 352 | argv->v0.token = 0; |
| 353 | } |
| 354 | argv->v0.owner = owner; |
| 355 | mutex_unlock(&cli->mutex); |
| 356 | |
| 357 | if (copy_to_user(user, argv, argc)) |
| 358 | ret = -EFAULT; |
| 359 | done: |
| 360 | kfree(argv); |
| 361 | return ret; |
| 362 | } |
| 363 | |
| 364 | void |
| 365 | usif_client_fini(struct nouveau_cli *cli) |
| 366 | { |
| 367 | struct usif_object *object, *otemp; |
| 368 | struct usif_notify *notify, *ntemp; |
| 369 | |
| 370 | list_for_each_entry_safe(notify, ntemp, &cli->notifys, head) { |
| 371 | usif_notify_dtor(notify); |
| 372 | } |
| 373 | |
| 374 | list_for_each_entry_safe(object, otemp, &cli->objects, head) { |
| 375 | usif_object_dtor(object); |
| 376 | } |
| 377 | } |
| 378 | |
| 379 | void |
| 380 | usif_client_init(struct nouveau_cli *cli) |
| 381 | { |
| 382 | INIT_LIST_HEAD(&cli->objects); |
| 383 | INIT_LIST_HEAD(&cli->notifys); |
| 384 | } |