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2024-05-10 61598093bbdd283a7edc367d900f223070ead8d2

 kernel/drivers/gpu/drm/i915/i915_sw_fence.c
..
..
@@ -1,19 +1,22 @@
1
1
 /*
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- * (C) Copyright 2016 Intel Corporation
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+ * SPDX-License-Identifier: MIT
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3
  *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; version 2
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- * of the License.
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+ * (C) Copyright 2016 Intel Corporation
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5
  */
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6
 
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7
 #include <linux/slab.h>
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8
 #include <linux/dma-fence.h>
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9
 #include <linux/irq_work.h>
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-#include <linux/reservation.h>
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+#include <linux/dma-resv.h>
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11
 
15
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 #include "i915_sw_fence.h"
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13
 #include "i915_selftest.h"
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+
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+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
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+#define I915_SW_FENCE_BUG_ON(expr) BUG_ON(expr)
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+#else
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+#define I915_SW_FENCE_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
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+#endif
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20
 
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 #define I915_SW_FENCE_FLAG_ALLOC BIT(3) /* after WQ_FLAG_* for safety */
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22
 
..
..
@@ -24,14 +27,14 @@
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 	DEBUG_FENCE_NOTIFY,
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28
 };
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29
 
27
-#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
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-
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 static void *i915_sw_fence_debug_hint(void *addr)
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 {
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 	return (void *)(((struct i915_sw_fence *)addr)->flags & I915_SW_FENCE_MASK);
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 }
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34
 
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-static struct debug_obj_descr i915_sw_fence_debug_descr = {
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+#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
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+
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+static const struct debug_obj_descr i915_sw_fence_debug_descr = {
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 	.name = "i915_sw_fence",
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 	.debug_hint = i915_sw_fence_debug_hint,
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40
 };
..
..
@@ -160,8 +163,15 @@
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 		LIST_HEAD(extra);
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164
 
162
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 		do {
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-			list_for_each_entry_safe(pos, next, &x->head, entry)
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-				pos->func(pos, TASK_NORMAL, 0, &extra);
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+			list_for_each_entry_safe(pos, next, &x->head, entry) {
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+				int wake_flags;
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+
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+				wake_flags = fence->error;
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+				if (pos->func == autoremove_wake_function)
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+					wake_flags = 0;
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+
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+				pos->func(pos, TASK_NORMAL, wake_flags, &extra);
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+			}
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175
 
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 			if (list_empty(&extra))
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177
 				break;
..
..
@@ -195,7 +205,7 @@
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 	__i915_sw_fence_notify(fence, FENCE_FREE);
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206
 }
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207
 
198
-static void i915_sw_fence_complete(struct i915_sw_fence *fence)
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+void i915_sw_fence_complete(struct i915_sw_fence *fence)
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 {
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 	debug_fence_assert(fence);
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211
 
..
..
@@ -205,10 +215,21 @@
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 	__i915_sw_fence_complete(fence, NULL);
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216
 }
207
217
 
208
-static void i915_sw_fence_await(struct i915_sw_fence *fence)
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+bool i915_sw_fence_await(struct i915_sw_fence *fence)
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 {
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-	debug_fence_assert(fence);
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-	WARN_ON(atomic_inc_return(&fence->pending) <= 1);
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+	int pending;
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+
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+	/*
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+	 * It is only safe to add a new await to the fence while it has
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+	 * not yet been signaled (i.e. there are still existing signalers).
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+	 */
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+	pending = atomic_read(&fence->pending);
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+	do {
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+		if (pending < 1)
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+			return false;
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+	} while (!atomic_try_cmpxchg(&fence->pending, &pending, pending + 1));
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+
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+	return true;
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233
 }
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234
 
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 void __i915_sw_fence_init(struct i915_sw_fence *fence,
..
..
@@ -218,11 +239,21 @@
218
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 {
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 	BUG_ON(!fn || (unsigned long)fn & ~I915_SW_FENCE_MASK);
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241
 
242
+	__init_waitqueue_head(&fence->wait, name, key);
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+	fence->flags = (unsigned long)fn;
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+
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+	i915_sw_fence_reinit(fence);
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+}
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+
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+void i915_sw_fence_reinit(struct i915_sw_fence *fence)
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+{
221
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 	debug_fence_init(fence);
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251
 
223
-	__init_waitqueue_head(&fence->wait, name, key);
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 	atomic_set(&fence->pending, 1);
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-	fence->flags = (unsigned long)fn;
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+	fence->error = 0;
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+
255
+	I915_SW_FENCE_BUG_ON(!fence->flags);
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+	I915_SW_FENCE_BUG_ON(!list_empty(&fence->wait.head));
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257
 }
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258
 
228
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 void i915_sw_fence_commit(struct i915_sw_fence *fence)
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@@ -233,6 +264,8 @@
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264
 
234
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 static int i915_sw_fence_wake(wait_queue_entry_t *wq, unsigned mode, int flags, void *key)
235
266
 {
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+	i915_sw_fence_set_error_once(wq->private, flags);
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+
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 	list_del(&wq->entry);
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 	__i915_sw_fence_complete(wq->private, key);
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271
 
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@@ -305,8 +338,10 @@
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 	debug_fence_assert(fence);
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339
 	might_sleep_if(gfpflags_allow_blocking(gfp));
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340
 
308
-	if (i915_sw_fence_done(signaler))
341
+	if (i915_sw_fence_done(signaler)) {
342
+		i915_sw_fence_set_error_once(fence, signaler->error);
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343
 		return 0;
344
+	}
310
345
 
311
346
 	debug_fence_assert(signaler);
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347
 
..
..
@@ -322,6 +357,7 @@
322
357
 				return -ENOMEM;
323
358
 
324
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 			i915_sw_fence_wait(signaler);
360
+			i915_sw_fence_set_error_once(fence, signaler->error);
325
361
 			return 0;
326
362
 		}
327
363
 
..
..
@@ -340,7 +376,7 @@
340
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 		__add_wait_queue_entry_tail(&signaler->wait, wq);
341
377
 		pending = 1;
342
378
 	} else {
343
-		i915_sw_fence_wake(wq, 0, 0, NULL);
379
+		i915_sw_fence_wake(wq, 0, signaler->error, NULL);
344
380
 		pending = 0;
345
381
 	}
346
382
 	spin_unlock_irqrestore(&signaler->wait.lock, flags);
..
..
@@ -362,11 +398,6 @@
362
398
 	return __i915_sw_fence_await_sw_fence(fence, signaler, NULL, gfp);
363
399
 }
364
400
 
365
-struct i915_sw_dma_fence_cb {
366
-	struct dma_fence_cb base;
367
-	struct i915_sw_fence *fence;
368
-};
369
-
370
401
 struct i915_sw_dma_fence_cb_timer {
371
402
 	struct i915_sw_dma_fence_cb base;
372
403
 	struct dma_fence *dma;
..
..
@@ -380,6 +411,7 @@
380
411
 {
381
412
 	struct i915_sw_dma_fence_cb *cb = container_of(data, typeof(*cb), base);
382
413
 
414
+	i915_sw_fence_set_error_once(cb->fence, dma->error);
383
415
 	i915_sw_fence_complete(cb->fence);
384
416
 	kfree(cb);
385
417
 }
..
..
@@ -393,11 +425,13 @@
393
425
 	if (!fence)
394
426
 		return;
395
427
 
396
-	pr_warn("asynchronous wait on fence %s:%s:%x timed out\n",
397
-		cb->dma->ops->get_driver_name(cb->dma),
398
-		cb->dma->ops->get_timeline_name(cb->dma),
399
-		cb->dma->seqno);
428
+	pr_notice("Asynchronous wait on fence %s:%s:%llx timed out (hint:%ps)\n",
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+		  cb->dma->ops->get_driver_name(cb->dma),
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+		  cb->dma->ops->get_timeline_name(cb->dma),
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+		  cb->dma->seqno,
432
+		  i915_sw_fence_debug_hint(fence));
400
433
 
434
+	i915_sw_fence_set_error_once(fence, -ETIMEDOUT);
401
435
 	i915_sw_fence_complete(fence);
402
436
 }
403
437
 
..
..
@@ -409,8 +443,10 @@
409
443
 	struct i915_sw_fence *fence;
410
444
 
411
445
 	fence = xchg(&cb->base.fence, NULL);
412
-	if (fence)
446
+	if (fence) {
447
+		i915_sw_fence_set_error_once(fence, dma->error);
413
448
 		i915_sw_fence_complete(fence);
449
+	}
414
450
 
415
451
 	irq_work_queue(&cb->work);
416
452
 }
..
..
@@ -438,8 +474,10 @@
438
474
 	debug_fence_assert(fence);
439
475
 	might_sleep_if(gfpflags_allow_blocking(gfp));
440
476
 
441
-	if (dma_fence_is_signaled(dma))
477
+	if (dma_fence_is_signaled(dma)) {
478
+		i915_sw_fence_set_error_once(fence, dma->error);
442
479
 		return 0;
480
+	}
443
481
 
444
482
 	cb = kmalloc(timeout ?
445
483
 		     sizeof(struct i915_sw_dma_fence_cb_timer) :
..
..
@@ -449,7 +487,12 @@
449
487
 		if (!gfpflags_allow_blocking(gfp))
450
488
 			return -ENOMEM;
451
489
 
452
-		return dma_fence_wait(dma, false);
490
+		ret = dma_fence_wait(dma, false);
491
+		if (ret)
492
+			return ret;
493
+
494
+		i915_sw_fence_set_error_once(fence, dma->error);
495
+		return 0;
453
496
 	}
454
497
 
455
498
 	cb->fence = fence;
..
..
@@ -482,8 +525,43 @@
482
525
 	return ret;
483
526
 }
484
527
 
528
+static void __dma_i915_sw_fence_wake(struct dma_fence *dma,
529
+				     struct dma_fence_cb *data)
530
+{
531
+	struct i915_sw_dma_fence_cb *cb = container_of(data, typeof(*cb), base);
532
+
533
+	i915_sw_fence_set_error_once(cb->fence, dma->error);
534
+	i915_sw_fence_complete(cb->fence);
535
+}
536
+
537
+int __i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
538
+				    struct dma_fence *dma,
539
+				    struct i915_sw_dma_fence_cb *cb)
540
+{
541
+	int ret;
542
+
543
+	debug_fence_assert(fence);
544
+
545
+	if (dma_fence_is_signaled(dma)) {
546
+		i915_sw_fence_set_error_once(fence, dma->error);
547
+		return 0;
548
+	}
549
+
550
+	cb->fence = fence;
551
+	i915_sw_fence_await(fence);
552
+
553
+	ret = 1;
554
+	if (dma_fence_add_callback(dma, &cb->base, __dma_i915_sw_fence_wake)) {
555
+		/* fence already signaled */
556
+		__dma_i915_sw_fence_wake(dma, &cb->base);
557
+		ret = 0;
558
+	}
559
+
560
+	return ret;
561
+}
562
+
485
563
 int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
486
-				    struct reservation_object *resv,
564
+				    struct dma_resv *resv,
487
565
 				    const struct dma_fence_ops *exclude,
488
566
 				    bool write,
489
567
 				    unsigned long timeout,
..
..
@@ -499,8 +577,7 @@
499
577
 		struct dma_fence **shared;
500
578
 		unsigned int count, i;
501
579
 
502
-		ret = reservation_object_get_fences_rcu(resv,
503
-							&excl, &count, &shared);
580
+		ret = dma_resv_get_fences_rcu(resv, &excl, &count, &shared);
504
581
 		if (ret)
505
582
 			return ret;
506
583
 
..
..
@@ -524,7 +601,7 @@
524
601
 			dma_fence_put(shared[i]);
525
602
 		kfree(shared);
526
603
 	} else {
527
-		excl = reservation_object_get_excl_rcu(resv);
604
+		excl = dma_resv_get_excl_rcu(resv);
528
605
 	}
529
606
 
530
607
 	if (ret >= 0 && excl && excl->ops != exclude) {