1 /* 2 * Copyright (C) 2007 Ben Skeggs. 3 * All Rights Reserved. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining 6 * a copy of this software and associated documentation files (the 7 * "Software"), to deal in the Software without restriction, including 8 * without limitation the rights to use, copy, modify, merge, publish, 9 * distribute, sublicense, and/or sell copies of the Software, and to 10 * permit persons to whom the Software is furnished to do so, subject to 11 * the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the 14 * next paragraph) shall be included in all copies or substantial 15 * portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE 21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 24 * 25 */ 26 27 #include <drm/drmP.h> 28 29 #include <linux/ktime.h> 30 #include <linux/hrtimer.h> 31 #include <trace/events/fence.h> 32 33 #include <nvif/notify.h> 34 #include <nvif/event.h> 35 36 #include "nouveau_drm.h" 37 #include "nouveau_dma.h" 38 #include "nouveau_fence.h" 39 40 static const struct fence_ops nouveau_fence_ops_uevent; 41 static const struct fence_ops nouveau_fence_ops_legacy; 42 43 static inline struct nouveau_fence * 44 from_fence(struct fence *fence) 45 { 46 return container_of(fence, struct nouveau_fence, base); 47 } 48 49 static inline struct nouveau_fence_chan * 50 nouveau_fctx(struct nouveau_fence *fence) 51 { 52 return container_of(fence->base.lock, struct nouveau_fence_chan, lock); 53 } 54 55 static void 56 nouveau_fence_signal(struct nouveau_fence *fence) 57 { 58 fence_signal_locked(&fence->base); 59 list_del(&fence->head); 60 61 if (test_bit(FENCE_FLAG_USER_BITS, &fence->base.flags)) { 62 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 63 64 if (!--fctx->notify_ref) 65 nvif_notify_put(&fctx->notify); 66 } 67 68 fence_put(&fence->base); 69 } 70 71 static struct nouveau_fence * 72 nouveau_local_fence(struct fence *fence, struct nouveau_drm *drm) { 73 struct nouveau_fence_priv *priv = (void*)drm->fence; 74 75 if (fence->ops != &nouveau_fence_ops_legacy && 76 fence->ops != &nouveau_fence_ops_uevent) 77 return NULL; 78 79 if (fence->context < priv->context_base || 80 fence->context >= priv->context_base + priv->contexts) 81 return NULL; 82 83 return from_fence(fence); 84 } 85 86 void 87 nouveau_fence_context_del(struct nouveau_fence_chan *fctx) 88 { 89 struct nouveau_fence *fence; 90 91 nvif_notify_fini(&fctx->notify); 92 93 spin_lock_irq(&fctx->lock); 94 while (!list_empty(&fctx->pending)) { 95 fence = list_entry(fctx->pending.next, typeof(*fence), head); 96 97 nouveau_fence_signal(fence); 98 fence->channel = NULL; 99 } 100 spin_unlock_irq(&fctx->lock); 101 } 102 103 static void 104 nouveau_fence_context_put(struct kref *fence_ref) 105 { 106 kfree(container_of(fence_ref, struct nouveau_fence_chan, fence_ref)); 107 } 108 109 void 110 nouveau_fence_context_free(struct nouveau_fence_chan *fctx) 111 { 112 kref_put(&fctx->fence_ref, nouveau_fence_context_put); 113 } 114 115 static void 116 nouveau_fence_update(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx) 117 { 118 struct nouveau_fence *fence; 119 120 u32 seq = fctx->read(chan); 121 122 while (!list_empty(&fctx->pending)) { 123 fence = list_entry(fctx->pending.next, typeof(*fence), head); 124 125 if ((int)(seq - fence->base.seqno) < 0) 126 return; 127 128 nouveau_fence_signal(fence); 129 } 130 } 131 132 static int 133 nouveau_fence_wait_uevent_handler(struct nvif_notify *notify) 134 { 135 struct nouveau_fence_chan *fctx = 136 container_of(notify, typeof(*fctx), notify); 137 unsigned long flags; 138 139 spin_lock_irqsave(&fctx->lock, flags); 140 if (!list_empty(&fctx->pending)) { 141 struct nouveau_fence *fence; 142 143 fence = list_entry(fctx->pending.next, typeof(*fence), head); 144 nouveau_fence_update(fence->channel, fctx); 145 } 146 spin_unlock_irqrestore(&fctx->lock, flags); 147 148 /* Always return keep here. NVIF refcount is handled with nouveau_fence_update */ 149 return NVIF_NOTIFY_KEEP; 150 } 151 152 void 153 nouveau_fence_context_new(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx) 154 { 155 struct nouveau_fence_priv *priv = (void*)chan->drm->fence; 156 struct nouveau_cli *cli = (void *)nvif_client(chan->object); 157 int ret; 158 159 INIT_LIST_HEAD(&fctx->flip); 160 INIT_LIST_HEAD(&fctx->pending); 161 spin_lock_init(&fctx->lock); 162 fctx->context = priv->context_base + chan->chid; 163 164 if (chan == chan->drm->cechan) 165 strcpy(fctx->name, "copy engine channel"); 166 else if (chan == chan->drm->channel) 167 strcpy(fctx->name, "generic kernel channel"); 168 else 169 strcpy(fctx->name, nvkm_client(&cli->base)->name); 170 171 kref_init(&fctx->fence_ref); 172 if (!priv->uevent) 173 return; 174 175 ret = nvif_notify_init(chan->object, NULL, 176 nouveau_fence_wait_uevent_handler, false, 177 G82_CHANNEL_DMA_V0_NTFY_UEVENT, 178 &(struct nvif_notify_uevent_req) { }, 179 sizeof(struct nvif_notify_uevent_req), 180 sizeof(struct nvif_notify_uevent_rep), 181 &fctx->notify); 182 183 WARN_ON(ret); 184 } 185 186 struct nouveau_fence_work { 187 struct work_struct work; 188 struct fence_cb cb; 189 void (*func)(void *); 190 void *data; 191 }; 192 193 static void 194 nouveau_fence_work_handler(struct work_struct *kwork) 195 { 196 struct nouveau_fence_work *work = container_of(kwork, typeof(*work), work); 197 work->func(work->data); 198 kfree(work); 199 } 200 201 static void nouveau_fence_work_cb(struct fence *fence, struct fence_cb *cb) 202 { 203 struct nouveau_fence_work *work = container_of(cb, typeof(*work), cb); 204 205 schedule_work(&work->work); 206 } 207 208 void 209 nouveau_fence_work(struct fence *fence, 210 void (*func)(void *), void *data) 211 { 212 struct nouveau_fence_work *work; 213 214 if (fence_is_signaled(fence)) 215 goto err; 216 217 work = kmalloc(sizeof(*work), GFP_KERNEL); 218 if (!work) { 219 /* 220 * this might not be a nouveau fence any more, 221 * so force a lazy wait here 222 */ 223 WARN_ON(nouveau_fence_wait((struct nouveau_fence *)fence, 224 true, false)); 225 goto err; 226 } 227 228 INIT_WORK(&work->work, nouveau_fence_work_handler); 229 work->func = func; 230 work->data = data; 231 232 if (fence_add_callback(fence, &work->cb, nouveau_fence_work_cb) < 0) 233 goto err_free; 234 return; 235 236 err_free: 237 kfree(work); 238 err: 239 func(data); 240 } 241 242 int 243 nouveau_fence_emit(struct nouveau_fence *fence, struct nouveau_channel *chan) 244 { 245 struct nouveau_fence_chan *fctx = chan->fence; 246 struct nouveau_fence_priv *priv = (void*)chan->drm->fence; 247 int ret; 248 249 fence->channel = chan; 250 fence->timeout = jiffies + (15 * HZ); 251 252 if (priv->uevent) 253 fence_init(&fence->base, &nouveau_fence_ops_uevent, 254 &fctx->lock, fctx->context, ++fctx->sequence); 255 else 256 fence_init(&fence->base, &nouveau_fence_ops_legacy, 257 &fctx->lock, fctx->context, ++fctx->sequence); 258 kref_get(&fctx->fence_ref); 259 260 trace_fence_emit(&fence->base); 261 ret = fctx->emit(fence); 262 if (!ret) { 263 fence_get(&fence->base); 264 spin_lock_irq(&fctx->lock); 265 nouveau_fence_update(chan, fctx); 266 list_add_tail(&fence->head, &fctx->pending); 267 spin_unlock_irq(&fctx->lock); 268 } 269 270 return ret; 271 } 272 273 bool 274 nouveau_fence_done(struct nouveau_fence *fence) 275 { 276 if (fence->base.ops == &nouveau_fence_ops_legacy || 277 fence->base.ops == &nouveau_fence_ops_uevent) { 278 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 279 unsigned long flags; 280 281 if (test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags)) 282 return true; 283 284 spin_lock_irqsave(&fctx->lock, flags); 285 nouveau_fence_update(fence->channel, fctx); 286 spin_unlock_irqrestore(&fctx->lock, flags); 287 } 288 return fence_is_signaled(&fence->base); 289 } 290 291 static long 292 nouveau_fence_wait_legacy(struct fence *f, bool intr, long wait) 293 { 294 struct nouveau_fence *fence = from_fence(f); 295 unsigned long sleep_time = NSEC_PER_MSEC / 1000; 296 unsigned long t = jiffies, timeout = t + wait; 297 298 while (!nouveau_fence_done(fence)) { 299 ktime_t kt; 300 301 t = jiffies; 302 303 if (wait != MAX_SCHEDULE_TIMEOUT && time_after_eq(t, timeout)) { 304 __set_current_state(TASK_RUNNING); 305 return 0; 306 } 307 308 __set_current_state(intr ? TASK_INTERRUPTIBLE : 309 TASK_UNINTERRUPTIBLE); 310 311 kt = ktime_set(0, sleep_time); 312 schedule_hrtimeout(&kt, HRTIMER_MODE_REL); 313 sleep_time *= 2; 314 if (sleep_time > NSEC_PER_MSEC) 315 sleep_time = NSEC_PER_MSEC; 316 317 if (intr && signal_pending(current)) 318 return -ERESTARTSYS; 319 } 320 321 __set_current_state(TASK_RUNNING); 322 323 return timeout - t; 324 } 325 326 static int 327 nouveau_fence_wait_busy(struct nouveau_fence *fence, bool intr) 328 { 329 int ret = 0; 330 331 while (!nouveau_fence_done(fence)) { 332 if (time_after_eq(jiffies, fence->timeout)) { 333 ret = -EBUSY; 334 break; 335 } 336 337 __set_current_state(intr ? 338 TASK_INTERRUPTIBLE : 339 TASK_UNINTERRUPTIBLE); 340 341 if (intr && signal_pending(current)) { 342 ret = -ERESTARTSYS; 343 break; 344 } 345 } 346 347 __set_current_state(TASK_RUNNING); 348 return ret; 349 } 350 351 int 352 nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr) 353 { 354 long ret; 355 356 if (!lazy) 357 return nouveau_fence_wait_busy(fence, intr); 358 359 ret = fence_wait_timeout(&fence->base, intr, 15 * HZ); 360 if (ret < 0) 361 return ret; 362 else if (!ret) 363 return -EBUSY; 364 else 365 return 0; 366 } 367 368 int 369 nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan, bool exclusive, bool intr) 370 { 371 struct nouveau_fence_chan *fctx = chan->fence; 372 struct fence *fence; 373 struct reservation_object *resv = nvbo->bo.resv; 374 struct reservation_object_list *fobj; 375 struct nouveau_fence *f; 376 int ret = 0, i; 377 378 if (!exclusive) { 379 ret = reservation_object_reserve_shared(resv); 380 381 if (ret) 382 return ret; 383 } 384 385 fobj = reservation_object_get_list(resv); 386 fence = reservation_object_get_excl(resv); 387 388 if (fence && (!exclusive || !fobj || !fobj->shared_count)) { 389 struct nouveau_channel *prev = NULL; 390 391 f = nouveau_local_fence(fence, chan->drm); 392 if (f) 393 prev = f->channel; 394 395 if (!prev || (prev != chan && (ret = fctx->sync(f, prev, chan)))) 396 ret = fence_wait(fence, intr); 397 398 return ret; 399 } 400 401 if (!exclusive || !fobj) 402 return ret; 403 404 for (i = 0; i < fobj->shared_count && !ret; ++i) { 405 struct nouveau_channel *prev = NULL; 406 407 fence = rcu_dereference_protected(fobj->shared[i], 408 reservation_object_held(resv)); 409 410 f = nouveau_local_fence(fence, chan->drm); 411 if (f) 412 prev = f->channel; 413 414 if (!prev || (prev != chan && (ret = fctx->sync(f, prev, chan)))) 415 ret = fence_wait(fence, intr); 416 417 if (ret) 418 break; 419 } 420 421 return ret; 422 } 423 424 void 425 nouveau_fence_unref(struct nouveau_fence **pfence) 426 { 427 if (*pfence) 428 fence_put(&(*pfence)->base); 429 *pfence = NULL; 430 } 431 432 int 433 nouveau_fence_new(struct nouveau_channel *chan, bool sysmem, 434 struct nouveau_fence **pfence) 435 { 436 struct nouveau_fence *fence; 437 int ret = 0; 438 439 if (unlikely(!chan->fence)) 440 return -ENODEV; 441 442 fence = kzalloc(sizeof(*fence), GFP_KERNEL); 443 if (!fence) 444 return -ENOMEM; 445 446 fence->sysmem = sysmem; 447 448 ret = nouveau_fence_emit(fence, chan); 449 if (ret) 450 nouveau_fence_unref(&fence); 451 452 *pfence = fence; 453 return ret; 454 } 455 456 static const char *nouveau_fence_get_get_driver_name(struct fence *fence) 457 { 458 return "nouveau"; 459 } 460 461 static const char *nouveau_fence_get_timeline_name(struct fence *f) 462 { 463 struct nouveau_fence *fence = from_fence(f); 464 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 465 466 return fence->channel ? fctx->name : "dead channel"; 467 } 468 469 /* 470 * In an ideal world, read would not assume the channel context is still alive. 471 * This function may be called from another device, running into free memory as a 472 * result. The drm node should still be there, so we can derive the index from 473 * the fence context. 474 */ 475 static bool nouveau_fence_is_signaled(struct fence *f) 476 { 477 struct nouveau_fence *fence = from_fence(f); 478 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 479 struct nouveau_channel *chan = fence->channel; 480 481 return (int)(fctx->read(chan) - fence->base.seqno) >= 0; 482 } 483 484 static bool nouveau_fence_no_signaling(struct fence *f) 485 { 486 struct nouveau_fence *fence = from_fence(f); 487 488 /* 489 * caller should have a reference on the fence, 490 * else fence could get freed here 491 */ 492 WARN_ON(atomic_read(&fence->base.refcount.refcount) <= 1); 493 494 /* 495 * This needs uevents to work correctly, but fence_add_callback relies on 496 * being able to enable signaling. It will still get signaled eventually, 497 * just not right away. 498 */ 499 if (nouveau_fence_is_signaled(f)) { 500 list_del(&fence->head); 501 502 fence_put(&fence->base); 503 return false; 504 } 505 506 return true; 507 } 508 509 static void nouveau_fence_release(struct fence *f) 510 { 511 struct nouveau_fence *fence = from_fence(f); 512 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 513 514 kref_put(&fctx->fence_ref, nouveau_fence_context_put); 515 fence_free(&fence->base); 516 } 517 518 static const struct fence_ops nouveau_fence_ops_legacy = { 519 .get_driver_name = nouveau_fence_get_get_driver_name, 520 .get_timeline_name = nouveau_fence_get_timeline_name, 521 .enable_signaling = nouveau_fence_no_signaling, 522 .signaled = nouveau_fence_is_signaled, 523 .wait = nouveau_fence_wait_legacy, 524 .release = nouveau_fence_release 525 }; 526 527 static bool nouveau_fence_enable_signaling(struct fence *f) 528 { 529 struct nouveau_fence *fence = from_fence(f); 530 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 531 bool ret; 532 533 if (!fctx->notify_ref++) 534 nvif_notify_get(&fctx->notify); 535 536 ret = nouveau_fence_no_signaling(f); 537 if (ret) 538 set_bit(FENCE_FLAG_USER_BITS, &fence->base.flags); 539 else if (!--fctx->notify_ref) 540 nvif_notify_put(&fctx->notify); 541 542 return ret; 543 } 544 545 static const struct fence_ops nouveau_fence_ops_uevent = { 546 .get_driver_name = nouveau_fence_get_get_driver_name, 547 .get_timeline_name = nouveau_fence_get_timeline_name, 548 .enable_signaling = nouveau_fence_enable_signaling, 549 .signaled = nouveau_fence_is_signaled, 550 .wait = fence_default_wait, 551 .release = NULL 552 }; 553