| 1 | /* |
| 2 | * SPDX-License-Identifier: MIT |
| 3 | * |
| 4 | * (C) Copyright 2016 Intel Corporation |
| 5 | */ |
| 6 | |
| 7 | #include <linux/slab.h> |
| 8 | #include <linux/dma-fence.h> |
| 9 | #include <linux/irq_work.h> |
| 10 | #include <linux/dma-resv.h> |
| 11 | |
| 12 | #include "i915_sw_fence.h" |
| 13 | #include "i915_selftest.h" |
| 14 | |
| 15 | #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) |
| 16 | #define I915_SW_FENCE_BUG_ON(expr) BUG_ON(expr) |
| 17 | #else |
| 18 | #define I915_SW_FENCE_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr) |
| 19 | #endif |
| 20 | |
| 21 | static DEFINE_SPINLOCK(i915_sw_fence_lock); |
| 22 | |
| 23 | #define WQ_FLAG_BITS \ |
| 24 | BITS_PER_TYPE(typeof_member(struct wait_queue_entry, flags)) |
| 25 | |
| 26 | /* after WQ_FLAG_* for safety */ |
| 27 | #define I915_SW_FENCE_FLAG_FENCE BIT(WQ_FLAG_BITS - 1) |
| 28 | #define I915_SW_FENCE_FLAG_ALLOC BIT(WQ_FLAG_BITS - 2) |
| 29 | |
| 30 | enum { |
| 31 | DEBUG_FENCE_IDLE = 0, |
| 32 | DEBUG_FENCE_NOTIFY, |
| 33 | }; |
| 34 | |
| 35 | static void *i915_sw_fence_debug_hint(void *addr) |
| 36 | { |
| 37 | return (void *)(((struct i915_sw_fence *)addr)->flags & I915_SW_FENCE_MASK); |
| 38 | } |
| 39 | |
| 40 | #ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS |
| 41 | |
| 42 | static const struct debug_obj_descr i915_sw_fence_debug_descr = { |
| 43 | .name = "i915_sw_fence", |
| 44 | .debug_hint = i915_sw_fence_debug_hint, |
| 45 | }; |
| 46 | |
| 47 | static inline void debug_fence_init(struct i915_sw_fence *fence) |
| 48 | { |
| 49 | debug_object_init(fence, &i915_sw_fence_debug_descr); |
| 50 | } |
| 51 | |
| 52 | static inline void debug_fence_init_onstack(struct i915_sw_fence *fence) |
| 53 | { |
| 54 | debug_object_init_on_stack(fence, &i915_sw_fence_debug_descr); |
| 55 | } |
| 56 | |
| 57 | static inline void debug_fence_activate(struct i915_sw_fence *fence) |
| 58 | { |
| 59 | debug_object_activate(fence, &i915_sw_fence_debug_descr); |
| 60 | } |
| 61 | |
| 62 | static inline void debug_fence_set_state(struct i915_sw_fence *fence, |
| 63 | int old, int new) |
| 64 | { |
| 65 | debug_object_active_state(fence, &i915_sw_fence_debug_descr, old, new); |
| 66 | } |
| 67 | |
| 68 | static inline void debug_fence_deactivate(struct i915_sw_fence *fence) |
| 69 | { |
| 70 | debug_object_deactivate(fence, &i915_sw_fence_debug_descr); |
| 71 | } |
| 72 | |
| 73 | static inline void debug_fence_destroy(struct i915_sw_fence *fence) |
| 74 | { |
| 75 | debug_object_destroy(fence, &i915_sw_fence_debug_descr); |
| 76 | } |
| 77 | |
| 78 | static inline void debug_fence_free(struct i915_sw_fence *fence) |
| 79 | { |
| 80 | debug_object_free(fence, &i915_sw_fence_debug_descr); |
| 81 | smp_wmb(); /* flush the change in state before reallocation */ |
| 82 | } |
| 83 | |
| 84 | static inline void debug_fence_assert(struct i915_sw_fence *fence) |
| 85 | { |
| 86 | debug_object_assert_init(fence, &i915_sw_fence_debug_descr); |
| 87 | } |
| 88 | |
| 89 | #else |
| 90 | |
| 91 | static inline void debug_fence_init(struct i915_sw_fence *fence) |
| 92 | { |
| 93 | } |
| 94 | |
| 95 | static inline void debug_fence_init_onstack(struct i915_sw_fence *fence) |
| 96 | { |
| 97 | } |
| 98 | |
| 99 | static inline void debug_fence_activate(struct i915_sw_fence *fence) |
| 100 | { |
| 101 | } |
| 102 | |
| 103 | static inline void debug_fence_set_state(struct i915_sw_fence *fence, |
| 104 | int old, int new) |
| 105 | { |
| 106 | } |
| 107 | |
| 108 | static inline void debug_fence_deactivate(struct i915_sw_fence *fence) |
| 109 | { |
| 110 | } |
| 111 | |
| 112 | static inline void debug_fence_destroy(struct i915_sw_fence *fence) |
| 113 | { |
| 114 | } |
| 115 | |
| 116 | static inline void debug_fence_free(struct i915_sw_fence *fence) |
| 117 | { |
| 118 | } |
| 119 | |
| 120 | static inline void debug_fence_assert(struct i915_sw_fence *fence) |
| 121 | { |
| 122 | } |
| 123 | |
| 124 | #endif |
| 125 | |
| 126 | static int __i915_sw_fence_notify(struct i915_sw_fence *fence, |
| 127 | enum i915_sw_fence_notify state) |
| 128 | { |
| 129 | i915_sw_fence_notify_t fn; |
| 130 | |
| 131 | fn = (i915_sw_fence_notify_t)(fence->flags & I915_SW_FENCE_MASK); |
| 132 | return fn(fence, state); |
| 133 | } |
| 134 | |
| 135 | #ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS |
| 136 | void i915_sw_fence_fini(struct i915_sw_fence *fence) |
| 137 | { |
| 138 | debug_fence_free(fence); |
| 139 | } |
| 140 | #endif |
| 141 | |
| 142 | static void __i915_sw_fence_wake_up_all(struct i915_sw_fence *fence, |
| 143 | struct list_head *continuation) |
| 144 | { |
| 145 | wait_queue_head_t *x = &fence->wait; |
| 146 | wait_queue_entry_t *pos, *next; |
| 147 | unsigned long flags; |
| 148 | |
| 149 | debug_fence_deactivate(fence); |
| 150 | atomic_set_release(&fence->pending, -1); /* 0 -> -1 [done] */ |
| 151 | |
| 152 | /* |
| 153 | * To prevent unbounded recursion as we traverse the graph of |
| 154 | * i915_sw_fences, we move the entry list from this, the next ready |
| 155 | * fence, to the tail of the original fence's entry list |
| 156 | * (and so added to the list to be woken). |
| 157 | */ |
| 158 | |
| 159 | spin_lock_irqsave_nested(&x->lock, flags, 1 + !!continuation); |
| 160 | if (continuation) { |
| 161 | list_for_each_entry_safe(pos, next, &x->head, entry) { |
| 162 | if (pos->flags & I915_SW_FENCE_FLAG_FENCE) |
| 163 | list_move_tail(&pos->entry, continuation); |
| 164 | else |
| 165 | pos->func(pos, TASK_NORMAL, 0, continuation); |
| 166 | } |
| 167 | } else { |
| 168 | LIST_HEAD(extra); |
| 169 | |
| 170 | do { |
| 171 | list_for_each_entry_safe(pos, next, &x->head, entry) { |
| 172 | int wake_flags; |
| 173 | |
| 174 | wake_flags = 0; |
| 175 | if (pos->flags & I915_SW_FENCE_FLAG_FENCE) |
| 176 | wake_flags = fence->error; |
| 177 | |
| 178 | pos->func(pos, TASK_NORMAL, wake_flags, &extra); |
| 179 | } |
| 180 | |
| 181 | if (list_empty(&extra)) |
| 182 | break; |
| 183 | |
| 184 | list_splice_tail_init(&extra, &x->head); |
| 185 | } while (1); |
| 186 | } |
| 187 | spin_unlock_irqrestore(&x->lock, flags); |
| 188 | |
| 189 | debug_fence_assert(fence); |
| 190 | } |
| 191 | |
| 192 | static void __i915_sw_fence_complete(struct i915_sw_fence *fence, |
| 193 | struct list_head *continuation) |
| 194 | { |
| 195 | debug_fence_assert(fence); |
| 196 | |
| 197 | if (!atomic_dec_and_test(&fence->pending)) |
| 198 | return; |
| 199 | |
| 200 | debug_fence_set_state(fence, DEBUG_FENCE_IDLE, DEBUG_FENCE_NOTIFY); |
| 201 | |
| 202 | if (__i915_sw_fence_notify(fence, FENCE_COMPLETE) != NOTIFY_DONE) |
| 203 | return; |
| 204 | |
| 205 | debug_fence_set_state(fence, DEBUG_FENCE_NOTIFY, DEBUG_FENCE_IDLE); |
| 206 | |
| 207 | __i915_sw_fence_wake_up_all(fence, continuation); |
| 208 | |
| 209 | debug_fence_destroy(fence); |
| 210 | __i915_sw_fence_notify(fence, FENCE_FREE); |
| 211 | } |
| 212 | |
| 213 | void i915_sw_fence_complete(struct i915_sw_fence *fence) |
| 214 | { |
| 215 | debug_fence_assert(fence); |
| 216 | |
| 217 | if (WARN_ON(i915_sw_fence_done(fence))) |
| 218 | return; |
| 219 | |
| 220 | __i915_sw_fence_complete(fence, NULL); |
| 221 | } |
| 222 | |
| 223 | bool i915_sw_fence_await(struct i915_sw_fence *fence) |
| 224 | { |
| 225 | int pending; |
| 226 | |
| 227 | /* |
| 228 | * It is only safe to add a new await to the fence while it has |
| 229 | * not yet been signaled (i.e. there are still existing signalers). |
| 230 | */ |
| 231 | pending = atomic_read(&fence->pending); |
| 232 | do { |
| 233 | if (pending < 1) |
| 234 | return false; |
| 235 | } while (!atomic_try_cmpxchg(&fence->pending, &pending, pending + 1)); |
| 236 | |
| 237 | return true; |
| 238 | } |
| 239 | |
| 240 | void __i915_sw_fence_init(struct i915_sw_fence *fence, |
| 241 | i915_sw_fence_notify_t fn, |
| 242 | const char *name, |
| 243 | struct lock_class_key *key) |
| 244 | { |
| 245 | BUG_ON(!fn || (unsigned long)fn & ~I915_SW_FENCE_MASK); |
| 246 | |
| 247 | __init_waitqueue_head(&fence->wait, name, key); |
| 248 | fence->flags = (unsigned long)fn; |
| 249 | |
| 250 | i915_sw_fence_reinit(fence); |
| 251 | } |
| 252 | |
| 253 | void i915_sw_fence_reinit(struct i915_sw_fence *fence) |
| 254 | { |
| 255 | debug_fence_init(fence); |
| 256 | |
| 257 | atomic_set(&fence->pending, 1); |
| 258 | fence->error = 0; |
| 259 | |
| 260 | I915_SW_FENCE_BUG_ON(!fence->flags); |
| 261 | I915_SW_FENCE_BUG_ON(!list_empty(&fence->wait.head)); |
| 262 | } |
| 263 | |
| 264 | void i915_sw_fence_commit(struct i915_sw_fence *fence) |
| 265 | { |
| 266 | debug_fence_activate(fence); |
| 267 | i915_sw_fence_complete(fence); |
| 268 | } |
| 269 | |
| 270 | static int i915_sw_fence_wake(wait_queue_entry_t *wq, unsigned mode, int flags, void *key) |
| 271 | { |
| 272 | i915_sw_fence_set_error_once(wq->private, flags); |
| 273 | |
| 274 | list_del(&wq->entry); |
| 275 | __i915_sw_fence_complete(wq->private, key); |
| 276 | |
| 277 | if (wq->flags & I915_SW_FENCE_FLAG_ALLOC) |
| 278 | kfree(wq); |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | static bool __i915_sw_fence_check_if_after(struct i915_sw_fence *fence, |
| 283 | const struct i915_sw_fence * const signaler) |
| 284 | { |
| 285 | wait_queue_entry_t *wq; |
| 286 | |
| 287 | if (__test_and_set_bit(I915_SW_FENCE_CHECKED_BIT, &fence->flags)) |
| 288 | return false; |
| 289 | |
| 290 | if (fence == signaler) |
| 291 | return true; |
| 292 | |
| 293 | list_for_each_entry(wq, &fence->wait.head, entry) { |
| 294 | if (wq->func != i915_sw_fence_wake) |
| 295 | continue; |
| 296 | |
| 297 | if (__i915_sw_fence_check_if_after(wq->private, signaler)) |
| 298 | return true; |
| 299 | } |
| 300 | |
| 301 | return false; |
| 302 | } |
| 303 | |
| 304 | static void __i915_sw_fence_clear_checked_bit(struct i915_sw_fence *fence) |
| 305 | { |
| 306 | wait_queue_entry_t *wq; |
| 307 | |
| 308 | if (!__test_and_clear_bit(I915_SW_FENCE_CHECKED_BIT, &fence->flags)) |
| 309 | return; |
| 310 | |
| 311 | list_for_each_entry(wq, &fence->wait.head, entry) { |
| 312 | if (wq->func != i915_sw_fence_wake) |
| 313 | continue; |
| 314 | |
| 315 | __i915_sw_fence_clear_checked_bit(wq->private); |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | static bool i915_sw_fence_check_if_after(struct i915_sw_fence *fence, |
| 320 | const struct i915_sw_fence * const signaler) |
| 321 | { |
| 322 | unsigned long flags; |
| 323 | bool err; |
| 324 | |
| 325 | if (!IS_ENABLED(CONFIG_DRM_I915_SW_FENCE_CHECK_DAG)) |
| 326 | return false; |
| 327 | |
| 328 | spin_lock_irqsave(&i915_sw_fence_lock, flags); |
| 329 | err = __i915_sw_fence_check_if_after(fence, signaler); |
| 330 | __i915_sw_fence_clear_checked_bit(fence); |
| 331 | spin_unlock_irqrestore(&i915_sw_fence_lock, flags); |
| 332 | |
| 333 | return err; |
| 334 | } |
| 335 | |
| 336 | static int __i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence, |
| 337 | struct i915_sw_fence *signaler, |
| 338 | wait_queue_entry_t *wq, gfp_t gfp) |
| 339 | { |
| 340 | unsigned int pending; |
| 341 | unsigned long flags; |
| 342 | |
| 343 | debug_fence_assert(fence); |
| 344 | might_sleep_if(gfpflags_allow_blocking(gfp)); |
| 345 | |
| 346 | if (i915_sw_fence_done(signaler)) { |
| 347 | i915_sw_fence_set_error_once(fence, signaler->error); |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | debug_fence_assert(signaler); |
| 352 | |
| 353 | /* The dependency graph must be acyclic. */ |
| 354 | if (unlikely(i915_sw_fence_check_if_after(fence, signaler))) |
| 355 | return -EINVAL; |
| 356 | |
| 357 | pending = I915_SW_FENCE_FLAG_FENCE; |
| 358 | if (!wq) { |
| 359 | wq = kmalloc(sizeof(*wq), gfp); |
| 360 | if (!wq) { |
| 361 | if (!gfpflags_allow_blocking(gfp)) |
| 362 | return -ENOMEM; |
| 363 | |
| 364 | i915_sw_fence_wait(signaler); |
| 365 | i915_sw_fence_set_error_once(fence, signaler->error); |
| 366 | return 0; |
| 367 | } |
| 368 | |
| 369 | pending |= I915_SW_FENCE_FLAG_ALLOC; |
| 370 | } |
| 371 | |
| 372 | INIT_LIST_HEAD(&wq->entry); |
| 373 | wq->flags = pending; |
| 374 | wq->func = i915_sw_fence_wake; |
| 375 | wq->private = fence; |
| 376 | |
| 377 | i915_sw_fence_await(fence); |
| 378 | |
| 379 | spin_lock_irqsave(&signaler->wait.lock, flags); |
| 380 | if (likely(!i915_sw_fence_done(signaler))) { |
| 381 | __add_wait_queue_entry_tail(&signaler->wait, wq); |
| 382 | pending = 1; |
| 383 | } else { |
| 384 | i915_sw_fence_wake(wq, 0, signaler->error, NULL); |
| 385 | pending = 0; |
| 386 | } |
| 387 | spin_unlock_irqrestore(&signaler->wait.lock, flags); |
| 388 | |
| 389 | return pending; |
| 390 | } |
| 391 | |
| 392 | int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence, |
| 393 | struct i915_sw_fence *signaler, |
| 394 | wait_queue_entry_t *wq) |
| 395 | { |
| 396 | return __i915_sw_fence_await_sw_fence(fence, signaler, wq, 0); |
| 397 | } |
| 398 | |
| 399 | int i915_sw_fence_await_sw_fence_gfp(struct i915_sw_fence *fence, |
| 400 | struct i915_sw_fence *signaler, |
| 401 | gfp_t gfp) |
| 402 | { |
| 403 | return __i915_sw_fence_await_sw_fence(fence, signaler, NULL, gfp); |
| 404 | } |
| 405 | |
| 406 | struct i915_sw_dma_fence_cb_timer { |
| 407 | struct i915_sw_dma_fence_cb base; |
| 408 | struct dma_fence *dma; |
| 409 | struct timer_list timer; |
| 410 | struct irq_work work; |
| 411 | struct rcu_head rcu; |
| 412 | }; |
| 413 | |
| 414 | static void dma_i915_sw_fence_wake(struct dma_fence *dma, |
| 415 | struct dma_fence_cb *data) |
| 416 | { |
| 417 | struct i915_sw_dma_fence_cb *cb = container_of(data, typeof(*cb), base); |
| 418 | |
| 419 | i915_sw_fence_set_error_once(cb->fence, dma->error); |
| 420 | i915_sw_fence_complete(cb->fence); |
| 421 | kfree(cb); |
| 422 | } |
| 423 | |
| 424 | static void timer_i915_sw_fence_wake(struct timer_list *t) |
| 425 | { |
| 426 | struct i915_sw_dma_fence_cb_timer *cb = from_timer(cb, t, timer); |
| 427 | struct i915_sw_fence *fence; |
| 428 | |
| 429 | fence = xchg(&cb->base.fence, NULL); |
| 430 | if (!fence) |
| 431 | return; |
| 432 | |
| 433 | pr_notice("Asynchronous wait on fence %s:%s:%llx timed out (hint:%ps)\n", |
| 434 | cb->dma->ops->get_driver_name(cb->dma), |
| 435 | cb->dma->ops->get_timeline_name(cb->dma), |
| 436 | cb->dma->seqno, |
| 437 | i915_sw_fence_debug_hint(fence)); |
| 438 | |
| 439 | i915_sw_fence_set_error_once(fence, -ETIMEDOUT); |
| 440 | i915_sw_fence_complete(fence); |
| 441 | } |
| 442 | |
| 443 | static void dma_i915_sw_fence_wake_timer(struct dma_fence *dma, |
| 444 | struct dma_fence_cb *data) |
| 445 | { |
| 446 | struct i915_sw_dma_fence_cb_timer *cb = |
| 447 | container_of(data, typeof(*cb), base.base); |
| 448 | struct i915_sw_fence *fence; |
| 449 | |
| 450 | fence = xchg(&cb->base.fence, NULL); |
| 451 | if (fence) { |
| 452 | i915_sw_fence_set_error_once(fence, dma->error); |
| 453 | i915_sw_fence_complete(fence); |
| 454 | } |
| 455 | |
| 456 | irq_work_queue(&cb->work); |
| 457 | } |
| 458 | |
| 459 | static void irq_i915_sw_fence_work(struct irq_work *wrk) |
| 460 | { |
| 461 | struct i915_sw_dma_fence_cb_timer *cb = |
| 462 | container_of(wrk, typeof(*cb), work); |
| 463 | |
| 464 | del_timer_sync(&cb->timer); |
| 465 | dma_fence_put(cb->dma); |
| 466 | |
| 467 | kfree_rcu(cb, rcu); |
| 468 | } |
| 469 | |
| 470 | int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence, |
| 471 | struct dma_fence *dma, |
| 472 | unsigned long timeout, |
| 473 | gfp_t gfp) |
| 474 | { |
| 475 | struct i915_sw_dma_fence_cb *cb; |
| 476 | dma_fence_func_t func; |
| 477 | int ret; |
| 478 | |
| 479 | debug_fence_assert(fence); |
| 480 | might_sleep_if(gfpflags_allow_blocking(gfp)); |
| 481 | |
| 482 | if (dma_fence_is_signaled(dma)) { |
| 483 | i915_sw_fence_set_error_once(fence, dma->error); |
| 484 | return 0; |
| 485 | } |
| 486 | |
| 487 | cb = kmalloc(timeout ? |
| 488 | sizeof(struct i915_sw_dma_fence_cb_timer) : |
| 489 | sizeof(struct i915_sw_dma_fence_cb), |
| 490 | gfp); |
| 491 | if (!cb) { |
| 492 | if (!gfpflags_allow_blocking(gfp)) |
| 493 | return -ENOMEM; |
| 494 | |
| 495 | ret = dma_fence_wait(dma, false); |
| 496 | if (ret) |
| 497 | return ret; |
| 498 | |
| 499 | i915_sw_fence_set_error_once(fence, dma->error); |
| 500 | return 0; |
| 501 | } |
| 502 | |
| 503 | cb->fence = fence; |
| 504 | i915_sw_fence_await(fence); |
| 505 | |
| 506 | func = dma_i915_sw_fence_wake; |
| 507 | if (timeout) { |
| 508 | struct i915_sw_dma_fence_cb_timer *timer = |
| 509 | container_of(cb, typeof(*timer), base); |
| 510 | |
| 511 | timer->dma = dma_fence_get(dma); |
| 512 | init_irq_work(&timer->work, irq_i915_sw_fence_work); |
| 513 | |
| 514 | timer_setup(&timer->timer, |
| 515 | timer_i915_sw_fence_wake, TIMER_IRQSAFE); |
| 516 | mod_timer(&timer->timer, round_jiffies_up(jiffies + timeout)); |
| 517 | |
| 518 | func = dma_i915_sw_fence_wake_timer; |
| 519 | } |
| 520 | |
| 521 | ret = dma_fence_add_callback(dma, &cb->base, func); |
| 522 | if (ret == 0) { |
| 523 | ret = 1; |
| 524 | } else { |
| 525 | func(dma, &cb->base); |
| 526 | if (ret == -ENOENT) /* fence already signaled */ |
| 527 | ret = 0; |
| 528 | } |
| 529 | |
| 530 | return ret; |
| 531 | } |
| 532 | |
| 533 | static void __dma_i915_sw_fence_wake(struct dma_fence *dma, |
| 534 | struct dma_fence_cb *data) |
| 535 | { |
| 536 | struct i915_sw_dma_fence_cb *cb = container_of(data, typeof(*cb), base); |
| 537 | |
| 538 | i915_sw_fence_set_error_once(cb->fence, dma->error); |
| 539 | i915_sw_fence_complete(cb->fence); |
| 540 | } |
| 541 | |
| 542 | int __i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence, |
| 543 | struct dma_fence *dma, |
| 544 | struct i915_sw_dma_fence_cb *cb) |
| 545 | { |
| 546 | int ret; |
| 547 | |
| 548 | debug_fence_assert(fence); |
| 549 | |
| 550 | if (dma_fence_is_signaled(dma)) { |
| 551 | i915_sw_fence_set_error_once(fence, dma->error); |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | cb->fence = fence; |
| 556 | i915_sw_fence_await(fence); |
| 557 | |
| 558 | ret = 1; |
| 559 | if (dma_fence_add_callback(dma, &cb->base, __dma_i915_sw_fence_wake)) { |
| 560 | /* fence already signaled */ |
| 561 | __dma_i915_sw_fence_wake(dma, &cb->base); |
| 562 | ret = 0; |
| 563 | } |
| 564 | |
| 565 | return ret; |
| 566 | } |
| 567 | |
| 568 | int i915_sw_fence_await_reservation(struct i915_sw_fence *fence, |
| 569 | struct dma_resv *resv, |
| 570 | const struct dma_fence_ops *exclude, |
| 571 | bool write, |
| 572 | unsigned long timeout, |
| 573 | gfp_t gfp) |
| 574 | { |
| 575 | struct dma_fence *excl; |
| 576 | int ret = 0, pending; |
| 577 | |
| 578 | debug_fence_assert(fence); |
| 579 | might_sleep_if(gfpflags_allow_blocking(gfp)); |
| 580 | |
| 581 | if (write) { |
| 582 | struct dma_fence **shared; |
| 583 | unsigned int count, i; |
| 584 | |
| 585 | ret = dma_resv_get_fences_rcu(resv, &excl, &count, &shared); |
| 586 | if (ret) |
| 587 | return ret; |
| 588 | |
| 589 | for (i = 0; i < count; i++) { |
| 590 | if (shared[i]->ops == exclude) |
| 591 | continue; |
| 592 | |
| 593 | pending = i915_sw_fence_await_dma_fence(fence, |
| 594 | shared[i], |
| 595 | timeout, |
| 596 | gfp); |
| 597 | if (pending < 0) { |
| 598 | ret = pending; |
| 599 | break; |
| 600 | } |
| 601 | |
| 602 | ret |= pending; |
| 603 | } |
| 604 | |
| 605 | for (i = 0; i < count; i++) |
| 606 | dma_fence_put(shared[i]); |
| 607 | kfree(shared); |
| 608 | } else { |
| 609 | excl = dma_resv_get_excl_rcu(resv); |
| 610 | } |
| 611 | |
| 612 | if (ret >= 0 && excl && excl->ops != exclude) { |
| 613 | pending = i915_sw_fence_await_dma_fence(fence, |
| 614 | excl, |
| 615 | timeout, |
| 616 | gfp); |
| 617 | if (pending < 0) |
| 618 | ret = pending; |
| 619 | else |
| 620 | ret |= pending; |
| 621 | } |
| 622 | |
| 623 | dma_fence_put(excl); |
| 624 | |
| 625 | return ret; |
| 626 | } |
| 627 | |
| 628 | #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) |
| 629 | #include "selftests/lib_sw_fence.c" |
| 630 | #include "selftests/i915_sw_fence.c" |
| 631 | #endif |