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/dma_fence.h> 32 33 #include <nvif/cl826e.h> 34 #include <nvif/notify.h> 35 #include <nvif/event.h> 36 37 #include "nouveau_drv.h" 38 #include "nouveau_dma.h" 39 #include "nouveau_fence.h" 40 41 static const struct dma_fence_ops nouveau_fence_ops_uevent; 42 static const struct dma_fence_ops nouveau_fence_ops_legacy; 43 44 static inline struct nouveau_fence * 45 from_fence(struct dma_fence *fence) 46 { 47 return container_of(fence, struct nouveau_fence, base); 48 } 49 50 static inline struct nouveau_fence_chan * 51 nouveau_fctx(struct nouveau_fence *fence) 52 { 53 return container_of(fence->base.lock, struct nouveau_fence_chan, lock); 54 } 55 56 static int 57 nouveau_fence_signal(struct nouveau_fence *fence) 58 { 59 int drop = 0; 60 61 dma_fence_signal_locked(&fence->base); 62 list_del(&fence->head); 63 rcu_assign_pointer(fence->channel, NULL); 64 65 if (test_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags)) { 66 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 67 68 if (!--fctx->notify_ref) 69 drop = 1; 70 } 71 72 dma_fence_put(&fence->base); 73 return drop; 74 } 75 76 static struct nouveau_fence * 77 nouveau_local_fence(struct dma_fence *fence, struct nouveau_drm *drm) { 78 struct nouveau_fence_priv *priv = (void*)drm->fence; 79 80 if (fence->ops != &nouveau_fence_ops_legacy && 81 fence->ops != &nouveau_fence_ops_uevent) 82 return NULL; 83 84 if (fence->context < priv->context_base || 85 fence->context >= priv->context_base + priv->contexts) 86 return NULL; 87 88 return from_fence(fence); 89 } 90 91 void 92 nouveau_fence_context_del(struct nouveau_fence_chan *fctx) 93 { 94 struct nouveau_fence *fence; 95 96 spin_lock_irq(&fctx->lock); 97 while (!list_empty(&fctx->pending)) { 98 fence = list_entry(fctx->pending.next, typeof(*fence), head); 99 100 if (nouveau_fence_signal(fence)) 101 nvif_notify_put(&fctx->notify); 102 } 103 spin_unlock_irq(&fctx->lock); 104 105 nvif_notify_fini(&fctx->notify); 106 fctx->dead = 1; 107 108 /* 109 * Ensure that all accesses to fence->channel complete before freeing 110 * the channel. 111 */ 112 synchronize_rcu(); 113 } 114 115 static void 116 nouveau_fence_context_put(struct kref *fence_ref) 117 { 118 kfree(container_of(fence_ref, struct nouveau_fence_chan, fence_ref)); 119 } 120 121 void 122 nouveau_fence_context_free(struct nouveau_fence_chan *fctx) 123 { 124 kref_put(&fctx->fence_ref, nouveau_fence_context_put); 125 } 126 127 static int 128 nouveau_fence_update(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx) 129 { 130 struct nouveau_fence *fence; 131 int drop = 0; 132 u32 seq = fctx->read(chan); 133 134 while (!list_empty(&fctx->pending)) { 135 fence = list_entry(fctx->pending.next, typeof(*fence), head); 136 137 if ((int)(seq - fence->base.seqno) < 0) 138 break; 139 140 drop |= nouveau_fence_signal(fence); 141 } 142 143 return drop; 144 } 145 146 static int 147 nouveau_fence_wait_uevent_handler(struct nvif_notify *notify) 148 { 149 struct nouveau_fence_chan *fctx = 150 container_of(notify, typeof(*fctx), notify); 151 unsigned long flags; 152 int ret = NVIF_NOTIFY_KEEP; 153 154 spin_lock_irqsave(&fctx->lock, flags); 155 if (!list_empty(&fctx->pending)) { 156 struct nouveau_fence *fence; 157 struct nouveau_channel *chan; 158 159 fence = list_entry(fctx->pending.next, typeof(*fence), head); 160 chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock)); 161 if (nouveau_fence_update(fence->channel, fctx)) 162 ret = NVIF_NOTIFY_DROP; 163 } 164 spin_unlock_irqrestore(&fctx->lock, flags); 165 166 return ret; 167 } 168 169 void 170 nouveau_fence_context_new(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx) 171 { 172 struct nouveau_fence_priv *priv = (void*)chan->drm->fence; 173 struct nouveau_cli *cli = (void *)chan->user.client; 174 int ret; 175 176 INIT_LIST_HEAD(&fctx->flip); 177 INIT_LIST_HEAD(&fctx->pending); 178 spin_lock_init(&fctx->lock); 179 fctx->context = priv->context_base + chan->chid; 180 181 if (chan == chan->drm->cechan) 182 strcpy(fctx->name, "copy engine channel"); 183 else if (chan == chan->drm->channel) 184 strcpy(fctx->name, "generic kernel channel"); 185 else 186 strcpy(fctx->name, nvxx_client(&cli->base)->name); 187 188 kref_init(&fctx->fence_ref); 189 if (!priv->uevent) 190 return; 191 192 ret = nvif_notify_init(&chan->user, nouveau_fence_wait_uevent_handler, 193 false, NV826E_V0_NTFY_NON_STALL_INTERRUPT, 194 &(struct nvif_notify_uevent_req) { }, 195 sizeof(struct nvif_notify_uevent_req), 196 sizeof(struct nvif_notify_uevent_rep), 197 &fctx->notify); 198 199 WARN_ON(ret); 200 } 201 202 int 203 nouveau_fence_emit(struct nouveau_fence *fence, struct nouveau_channel *chan) 204 { 205 struct nouveau_fence_chan *fctx = chan->fence; 206 struct nouveau_fence_priv *priv = (void*)chan->drm->fence; 207 int ret; 208 209 fence->channel = chan; 210 fence->timeout = jiffies + (15 * HZ); 211 212 if (priv->uevent) 213 dma_fence_init(&fence->base, &nouveau_fence_ops_uevent, 214 &fctx->lock, fctx->context, ++fctx->sequence); 215 else 216 dma_fence_init(&fence->base, &nouveau_fence_ops_legacy, 217 &fctx->lock, fctx->context, ++fctx->sequence); 218 kref_get(&fctx->fence_ref); 219 220 trace_dma_fence_emit(&fence->base); 221 ret = fctx->emit(fence); 222 if (!ret) { 223 dma_fence_get(&fence->base); 224 spin_lock_irq(&fctx->lock); 225 226 if (nouveau_fence_update(chan, fctx)) 227 nvif_notify_put(&fctx->notify); 228 229 list_add_tail(&fence->head, &fctx->pending); 230 spin_unlock_irq(&fctx->lock); 231 } 232 233 return ret; 234 } 235 236 bool 237 nouveau_fence_done(struct nouveau_fence *fence) 238 { 239 if (fence->base.ops == &nouveau_fence_ops_legacy || 240 fence->base.ops == &nouveau_fence_ops_uevent) { 241 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 242 struct nouveau_channel *chan; 243 unsigned long flags; 244 245 if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags)) 246 return true; 247 248 spin_lock_irqsave(&fctx->lock, flags); 249 chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock)); 250 if (chan && nouveau_fence_update(chan, fctx)) 251 nvif_notify_put(&fctx->notify); 252 spin_unlock_irqrestore(&fctx->lock, flags); 253 } 254 return dma_fence_is_signaled(&fence->base); 255 } 256 257 static long 258 nouveau_fence_wait_legacy(struct dma_fence *f, bool intr, long wait) 259 { 260 struct nouveau_fence *fence = from_fence(f); 261 unsigned long sleep_time = NSEC_PER_MSEC / 1000; 262 unsigned long t = jiffies, timeout = t + wait; 263 264 while (!nouveau_fence_done(fence)) { 265 ktime_t kt; 266 267 t = jiffies; 268 269 if (wait != MAX_SCHEDULE_TIMEOUT && time_after_eq(t, timeout)) { 270 __set_current_state(TASK_RUNNING); 271 return 0; 272 } 273 274 __set_current_state(intr ? TASK_INTERRUPTIBLE : 275 TASK_UNINTERRUPTIBLE); 276 277 kt = sleep_time; 278 schedule_hrtimeout(&kt, HRTIMER_MODE_REL); 279 sleep_time *= 2; 280 if (sleep_time > NSEC_PER_MSEC) 281 sleep_time = NSEC_PER_MSEC; 282 283 if (intr && signal_pending(current)) 284 return -ERESTARTSYS; 285 } 286 287 __set_current_state(TASK_RUNNING); 288 289 return timeout - t; 290 } 291 292 static int 293 nouveau_fence_wait_busy(struct nouveau_fence *fence, bool intr) 294 { 295 int ret = 0; 296 297 while (!nouveau_fence_done(fence)) { 298 if (time_after_eq(jiffies, fence->timeout)) { 299 ret = -EBUSY; 300 break; 301 } 302 303 __set_current_state(intr ? 304 TASK_INTERRUPTIBLE : 305 TASK_UNINTERRUPTIBLE); 306 307 if (intr && signal_pending(current)) { 308 ret = -ERESTARTSYS; 309 break; 310 } 311 } 312 313 __set_current_state(TASK_RUNNING); 314 return ret; 315 } 316 317 int 318 nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr) 319 { 320 long ret; 321 322 if (!lazy) 323 return nouveau_fence_wait_busy(fence, intr); 324 325 ret = dma_fence_wait_timeout(&fence->base, intr, 15 * HZ); 326 if (ret < 0) 327 return ret; 328 else if (!ret) 329 return -EBUSY; 330 else 331 return 0; 332 } 333 334 int 335 nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan, bool exclusive, bool intr) 336 { 337 struct nouveau_fence_chan *fctx = chan->fence; 338 struct dma_fence *fence; 339 struct reservation_object *resv = nvbo->bo.resv; 340 struct reservation_object_list *fobj; 341 struct nouveau_fence *f; 342 int ret = 0, i; 343 344 if (!exclusive) { 345 ret = reservation_object_reserve_shared(resv); 346 347 if (ret) 348 return ret; 349 } 350 351 fobj = reservation_object_get_list(resv); 352 fence = reservation_object_get_excl(resv); 353 354 if (fence && (!exclusive || !fobj || !fobj->shared_count)) { 355 struct nouveau_channel *prev = NULL; 356 bool must_wait = true; 357 358 f = nouveau_local_fence(fence, chan->drm); 359 if (f) { 360 rcu_read_lock(); 361 prev = rcu_dereference(f->channel); 362 if (prev && (prev == chan || fctx->sync(f, prev, chan) == 0)) 363 must_wait = false; 364 rcu_read_unlock(); 365 } 366 367 if (must_wait) 368 ret = dma_fence_wait(fence, intr); 369 370 return ret; 371 } 372 373 if (!exclusive || !fobj) 374 return ret; 375 376 for (i = 0; i < fobj->shared_count && !ret; ++i) { 377 struct nouveau_channel *prev = NULL; 378 bool must_wait = true; 379 380 fence = rcu_dereference_protected(fobj->shared[i], 381 reservation_object_held(resv)); 382 383 f = nouveau_local_fence(fence, chan->drm); 384 if (f) { 385 rcu_read_lock(); 386 prev = rcu_dereference(f->channel); 387 if (prev && (prev == chan || fctx->sync(f, prev, chan) == 0)) 388 must_wait = false; 389 rcu_read_unlock(); 390 } 391 392 if (must_wait) 393 ret = dma_fence_wait(fence, intr); 394 } 395 396 return ret; 397 } 398 399 void 400 nouveau_fence_unref(struct nouveau_fence **pfence) 401 { 402 if (*pfence) 403 dma_fence_put(&(*pfence)->base); 404 *pfence = NULL; 405 } 406 407 int 408 nouveau_fence_new(struct nouveau_channel *chan, bool sysmem, 409 struct nouveau_fence **pfence) 410 { 411 struct nouveau_fence *fence; 412 int ret = 0; 413 414 if (unlikely(!chan->fence)) 415 return -ENODEV; 416 417 fence = kzalloc(sizeof(*fence), GFP_KERNEL); 418 if (!fence) 419 return -ENOMEM; 420 421 ret = nouveau_fence_emit(fence, chan); 422 if (ret) 423 nouveau_fence_unref(&fence); 424 425 *pfence = fence; 426 return ret; 427 } 428 429 static const char *nouveau_fence_get_get_driver_name(struct dma_fence *fence) 430 { 431 return "nouveau"; 432 } 433 434 static const char *nouveau_fence_get_timeline_name(struct dma_fence *f) 435 { 436 struct nouveau_fence *fence = from_fence(f); 437 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 438 439 return !fctx->dead ? fctx->name : "dead channel"; 440 } 441 442 /* 443 * In an ideal world, read would not assume the channel context is still alive. 444 * This function may be called from another device, running into free memory as a 445 * result. The drm node should still be there, so we can derive the index from 446 * the fence context. 447 */ 448 static bool nouveau_fence_is_signaled(struct dma_fence *f) 449 { 450 struct nouveau_fence *fence = from_fence(f); 451 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 452 struct nouveau_channel *chan; 453 bool ret = false; 454 455 rcu_read_lock(); 456 chan = rcu_dereference(fence->channel); 457 if (chan) 458 ret = (int)(fctx->read(chan) - fence->base.seqno) >= 0; 459 rcu_read_unlock(); 460 461 return ret; 462 } 463 464 static bool nouveau_fence_no_signaling(struct dma_fence *f) 465 { 466 struct nouveau_fence *fence = from_fence(f); 467 468 /* 469 * caller should have a reference on the fence, 470 * else fence could get freed here 471 */ 472 WARN_ON(kref_read(&fence->base.refcount) <= 1); 473 474 /* 475 * This needs uevents to work correctly, but dma_fence_add_callback relies on 476 * being able to enable signaling. It will still get signaled eventually, 477 * just not right away. 478 */ 479 if (nouveau_fence_is_signaled(f)) { 480 list_del(&fence->head); 481 482 dma_fence_put(&fence->base); 483 return false; 484 } 485 486 return true; 487 } 488 489 static void nouveau_fence_release(struct dma_fence *f) 490 { 491 struct nouveau_fence *fence = from_fence(f); 492 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 493 494 kref_put(&fctx->fence_ref, nouveau_fence_context_put); 495 dma_fence_free(&fence->base); 496 } 497 498 static const struct dma_fence_ops nouveau_fence_ops_legacy = { 499 .get_driver_name = nouveau_fence_get_get_driver_name, 500 .get_timeline_name = nouveau_fence_get_timeline_name, 501 .enable_signaling = nouveau_fence_no_signaling, 502 .signaled = nouveau_fence_is_signaled, 503 .wait = nouveau_fence_wait_legacy, 504 .release = nouveau_fence_release 505 }; 506 507 static bool nouveau_fence_enable_signaling(struct dma_fence *f) 508 { 509 struct nouveau_fence *fence = from_fence(f); 510 struct nouveau_fence_chan *fctx = nouveau_fctx(fence); 511 bool ret; 512 513 if (!fctx->notify_ref++) 514 nvif_notify_get(&fctx->notify); 515 516 ret = nouveau_fence_no_signaling(f); 517 if (ret) 518 set_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags); 519 else if (!--fctx->notify_ref) 520 nvif_notify_put(&fctx->notify); 521 522 return ret; 523 } 524 525 static const struct dma_fence_ops nouveau_fence_ops_uevent = { 526 .get_driver_name = nouveau_fence_get_get_driver_name, 527 .get_timeline_name = nouveau_fence_get_timeline_name, 528 .enable_signaling = nouveau_fence_enable_signaling, 529 .signaled = nouveau_fence_is_signaled, 530 .wait = dma_fence_default_wait, 531 .release = nouveau_fence_release 532 }; 533