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25 #include <linux/completion.h>
26 #include <linux/delay.h>
27 #include <linux/prime_numbers.h>
29 #include "../i915_selftest.h"
31 static int __i915_sw_fence_call
32 fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
39 /* Leave the fence for the caller to free it after testing */
46 static struct i915_sw_fence *alloc_fence(void)
48 struct i915_sw_fence *fence;
50 fence = kmalloc(sizeof(*fence), GFP_KERNEL);
54 i915_sw_fence_init(fence, fence_notify);
58 static void free_fence(struct i915_sw_fence *fence)
60 i915_sw_fence_fini(fence);
64 static int __test_self(struct i915_sw_fence *fence)
66 if (i915_sw_fence_done(fence))
69 i915_sw_fence_commit(fence);
70 if (!i915_sw_fence_done(fence))
73 i915_sw_fence_wait(fence);
74 if (!i915_sw_fence_done(fence))
80 static int test_self(void *arg)
82 struct i915_sw_fence *fence;
85 /* Test i915_sw_fence signaling and completion testing */
86 fence = alloc_fence();
90 ret = __test_self(fence);
96 static int test_dag(void *arg)
98 struct i915_sw_fence *A, *B, *C;
101 /* Test detection of cycles within the i915_sw_fence graphs */
102 if (!IS_ENABLED(CONFIG_DRM_I915_SW_FENCE_CHECK_DAG))
109 if (i915_sw_fence_await_sw_fence_gfp(A, A, GFP_KERNEL) != -EINVAL) {
110 pr_err("recursive cycle not detected (AA)\n");
120 i915_sw_fence_await_sw_fence_gfp(A, B, GFP_KERNEL);
121 if (i915_sw_fence_await_sw_fence_gfp(B, A, GFP_KERNEL) != -EINVAL) {
122 pr_err("single depth cycle not detected (BAB)\n");
132 if (i915_sw_fence_await_sw_fence_gfp(B, C, GFP_KERNEL) == -EINVAL) {
133 pr_err("invalid cycle detected\n");
136 if (i915_sw_fence_await_sw_fence_gfp(C, B, GFP_KERNEL) != -EINVAL) {
137 pr_err("single depth cycle not detected (CBC)\n");
140 if (i915_sw_fence_await_sw_fence_gfp(C, A, GFP_KERNEL) != -EINVAL) {
141 pr_err("cycle not detected (BA, CB, AC)\n");
144 if (i915_sw_fence_await_sw_fence_gfp(A, C, GFP_KERNEL) == -EINVAL) {
145 pr_err("invalid cycle detected\n");
149 i915_sw_fence_commit(A);
150 i915_sw_fence_commit(B);
151 i915_sw_fence_commit(C);
154 if (!i915_sw_fence_done(C)) {
155 pr_err("fence C not done\n");
158 if (!i915_sw_fence_done(B)) {
159 pr_err("fence B not done\n");
162 if (!i915_sw_fence_done(A)) {
163 pr_err("fence A not done\n");
175 static int test_AB(void *arg)
177 struct i915_sw_fence *A, *B;
180 /* Test i915_sw_fence (A) waiting on an event source (B) */
190 ret = i915_sw_fence_await_sw_fence_gfp(A, B, GFP_KERNEL);
194 pr_err("Incorrectly reported fence A was complete before await\n");
200 i915_sw_fence_commit(A);
201 if (i915_sw_fence_done(A))
204 i915_sw_fence_commit(B);
205 if (!i915_sw_fence_done(B)) {
206 pr_err("Fence B is not done\n");
210 if (!i915_sw_fence_done(A)) {
211 pr_err("Fence A is not done\n");
223 static int test_ABC(void *arg)
225 struct i915_sw_fence *A, *B, *C;
228 /* Test a chain of fences, A waits on B who waits on C */
245 ret = i915_sw_fence_await_sw_fence_gfp(A, B, GFP_KERNEL);
249 pr_err("Incorrectly reported fence B was complete before await\n");
253 ret = i915_sw_fence_await_sw_fence_gfp(B, C, GFP_KERNEL);
257 pr_err("Incorrectly reported fence C was complete before await\n");
262 i915_sw_fence_commit(A);
263 if (i915_sw_fence_done(A)) {
264 pr_err("Fence A completed early\n");
268 i915_sw_fence_commit(B);
269 if (i915_sw_fence_done(B)) {
270 pr_err("Fence B completed early\n");
274 if (i915_sw_fence_done(A)) {
275 pr_err("Fence A completed early (after signaling B)\n");
279 i915_sw_fence_commit(C);
282 if (!i915_sw_fence_done(C)) {
283 pr_err("Fence C not done\n");
286 if (!i915_sw_fence_done(B)) {
287 pr_err("Fence B not done\n");
290 if (!i915_sw_fence_done(A)) {
291 pr_err("Fence A not done\n");
303 static int test_AB_C(void *arg)
305 struct i915_sw_fence *A, *B, *C;
308 /* Test multiple fences (AB) waiting on a single event (C) */
325 ret = i915_sw_fence_await_sw_fence_gfp(A, C, GFP_KERNEL);
333 ret = i915_sw_fence_await_sw_fence_gfp(B, C, GFP_KERNEL);
341 i915_sw_fence_commit(A);
342 i915_sw_fence_commit(B);
345 if (i915_sw_fence_done(A)) {
346 pr_err("Fence A completed early\n");
350 if (i915_sw_fence_done(B)) {
351 pr_err("Fence B completed early\n");
355 i915_sw_fence_commit(C);
356 if (!i915_sw_fence_done(C)) {
357 pr_err("Fence C not done\n");
361 if (!i915_sw_fence_done(B)) {
362 pr_err("Fence B not done\n");
366 if (!i915_sw_fence_done(A)) {
367 pr_err("Fence A not done\n");
380 static int test_C_AB(void *arg)
382 struct i915_sw_fence *A, *B, *C;
385 /* Test multiple event sources (A,B) for a single fence (C) */
402 ret = i915_sw_fence_await_sw_fence_gfp(C, A, GFP_KERNEL);
410 ret = i915_sw_fence_await_sw_fence_gfp(C, B, GFP_KERNEL);
419 i915_sw_fence_commit(C);
420 if (i915_sw_fence_done(C))
423 i915_sw_fence_commit(A);
424 i915_sw_fence_commit(B);
426 if (!i915_sw_fence_done(A)) {
427 pr_err("Fence A not done\n");
431 if (!i915_sw_fence_done(B)) {
432 pr_err("Fence B not done\n");
436 if (!i915_sw_fence_done(C)) {
437 pr_err("Fence C not done\n");
450 static int test_chain(void *arg)
453 struct i915_sw_fence **fences;
456 /* Test a long chain of fences */
457 fences = kmalloc_array(nfences, sizeof(*fences), GFP_KERNEL);
461 for (i = 0; i < nfences; i++) {
462 fences[i] = alloc_fence();
470 ret = i915_sw_fence_await_sw_fence_gfp(fences[i],
478 i915_sw_fence_commit(fences[i]);
483 for (i = nfences; --i; ) {
484 if (i915_sw_fence_done(fences[i])) {
486 pr_err("Fence[%d] completed early\n", i);
490 i915_sw_fence_commit(fences[0]);
491 for (i = 0; ret == 0 && i < nfences; i++) {
492 if (!i915_sw_fence_done(fences[i])) {
493 pr_err("Fence[%d] is not done\n", i);
499 for (i = 0; i < nfences; i++)
500 free_fence(fences[i]);
506 struct work_struct work;
507 struct completion started;
508 struct i915_sw_fence *in, *out;
512 static void task_ipc(struct work_struct *work)
514 struct task_ipc *ipc = container_of(work, typeof(*ipc), work);
516 complete(&ipc->started);
518 i915_sw_fence_wait(ipc->in);
519 smp_store_mb(ipc->value, 1);
520 i915_sw_fence_commit(ipc->out);
523 static int test_ipc(void *arg)
528 /* Test use of i915_sw_fence as an interprocess signaling mechanism */
529 ipc.in = alloc_fence();
532 ipc.out = alloc_fence();
538 /* use a completion to avoid chicken-and-egg testing */
539 init_completion(&ipc.started);
542 INIT_WORK_ONSTACK(&ipc.work, task_ipc);
543 schedule_work(&ipc.work);
545 wait_for_completion(&ipc.started);
547 usleep_range(1000, 2000);
548 if (READ_ONCE(ipc.value)) {
549 pr_err("worker updated value before i915_sw_fence was signaled\n");
553 i915_sw_fence_commit(ipc.in);
554 i915_sw_fence_wait(ipc.out);
556 if (!READ_ONCE(ipc.value)) {
557 pr_err("worker signaled i915_sw_fence before value was posted\n");
561 flush_work(&ipc.work);
562 destroy_work_on_stack(&ipc.work);
569 static int test_timer(void *arg)
571 unsigned long target, delay;
572 struct timed_fence tf;
574 timed_fence_init(&tf, target = jiffies);
575 if (!i915_sw_fence_done(&tf.fence)) {
576 pr_err("Fence with immediate expiration not signaled\n");
579 timed_fence_fini(&tf);
581 for_each_prime_number(delay, i915_selftest.timeout_jiffies/2) {
582 timed_fence_init(&tf, target = jiffies + delay);
583 if (i915_sw_fence_done(&tf.fence)) {
584 pr_err("Fence with future expiration (%lu jiffies) already signaled\n", delay);
588 i915_sw_fence_wait(&tf.fence);
589 if (!i915_sw_fence_done(&tf.fence)) {
590 pr_err("Fence not signaled after wait\n");
593 if (time_before(jiffies, target)) {
594 pr_err("Fence signaled too early, target=%lu, now=%lu\n",
599 timed_fence_fini(&tf);
605 timed_fence_fini(&tf);
609 static const char *mock_name(struct dma_fence *fence)
614 static bool mock_enable_signaling(struct dma_fence *fence)
619 static const struct dma_fence_ops mock_fence_ops = {
620 .get_driver_name = mock_name,
621 .get_timeline_name = mock_name,
622 .enable_signaling = mock_enable_signaling,
623 .wait = dma_fence_default_wait,
624 .release = dma_fence_free,
627 static DEFINE_SPINLOCK(mock_fence_lock);
629 static struct dma_fence *alloc_dma_fence(void)
631 struct dma_fence *dma;
633 dma = kmalloc(sizeof(*dma), GFP_KERNEL);
635 dma_fence_init(dma, &mock_fence_ops, &mock_fence_lock, 0, 0);
640 static struct i915_sw_fence *
641 wrap_dma_fence(struct dma_fence *dma, unsigned long delay)
643 struct i915_sw_fence *fence;
646 fence = alloc_fence();
648 return ERR_PTR(-ENOMEM);
650 err = i915_sw_fence_await_dma_fence(fence, dma, delay, GFP_NOWAIT);
651 i915_sw_fence_commit(fence);
660 static int test_dma_fence(void *arg)
662 struct i915_sw_fence *timeout = NULL, *not = NULL;
663 unsigned long delay = i915_selftest.timeout_jiffies;
664 unsigned long end, sleep;
665 struct dma_fence *dma;
668 dma = alloc_dma_fence();
672 timeout = wrap_dma_fence(dma, delay);
673 if (IS_ERR(timeout)) {
674 err = PTR_ERR(timeout);
678 not = wrap_dma_fence(dma, 0);
685 if (i915_sw_fence_done(timeout) || i915_sw_fence_done(not)) {
686 pr_err("Fences immediately signaled\n");
690 /* We round the timeout for the fence up to the next second */
691 end = round_jiffies_up(jiffies + delay);
693 sleep = jiffies_to_usecs(delay) / 3;
694 usleep_range(sleep, 2 * sleep);
695 if (time_after(jiffies, end)) {
696 pr_debug("Slept too long, delay=%lu, (target=%lu, now=%lu) skipping\n",
697 delay, end, jiffies);
701 if (i915_sw_fence_done(timeout) || i915_sw_fence_done(not)) {
702 pr_err("Fences signaled too early\n");
706 if (!wait_event_timeout(timeout->wait,
707 i915_sw_fence_done(timeout),
708 2 * (end - jiffies) + 1)) {
709 pr_err("Timeout fence unsignaled!\n");
713 if (i915_sw_fence_done(not)) {
714 pr_err("No timeout fence signaled!\n");
719 dma_fence_signal(dma);
721 if (!i915_sw_fence_done(timeout) || !i915_sw_fence_done(not)) {
722 pr_err("Fences unsignaled\n");
733 dma_fence_signal(dma);
734 if (!IS_ERR_OR_NULL(timeout))
736 if (!IS_ERR_OR_NULL(not))
742 int i915_sw_fence_mock_selftests(void)
744 static const struct i915_subtest tests[] = {
754 SUBTEST(test_dma_fence),
757 return i915_subtests(tests, NULL);