1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright © 2017-2018 Intel Corporation
4  */
5 
6 #include <linux/prime_numbers.h>
7 #include <linux/string_helpers.h>
8 
9 #include "intel_context.h"
10 #include "intel_engine_heartbeat.h"
11 #include "intel_engine_pm.h"
12 #include "intel_engine_regs.h"
13 #include "intel_gpu_commands.h"
14 #include "intel_gt.h"
15 #include "intel_gt_requests.h"
16 #include "intel_ring.h"
17 #include "selftest_engine_heartbeat.h"
18 
19 #include "../selftests/i915_random.h"
20 #include "../i915_selftest.h"
21 
22 #include "selftests/igt_flush_test.h"
23 #include "selftests/lib_sw_fence.h"
24 #include "selftests/mock_gem_device.h"
25 #include "selftests/mock_timeline.h"
26 
27 static struct page *hwsp_page(struct intel_timeline *tl)
28 {
29 	struct drm_i915_gem_object *obj = tl->hwsp_ggtt->obj;
30 
31 	GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
32 	return sg_page(obj->mm.pages->sgl);
33 }
34 
35 static unsigned long hwsp_cacheline(struct intel_timeline *tl)
36 {
37 	unsigned long address = (unsigned long)page_address(hwsp_page(tl));
38 
39 	return (address + offset_in_page(tl->hwsp_offset)) / TIMELINE_SEQNO_BYTES;
40 }
41 
42 static int selftest_tl_pin(struct intel_timeline *tl)
43 {
44 	struct i915_gem_ww_ctx ww;
45 	int err;
46 
47 	i915_gem_ww_ctx_init(&ww, false);
48 retry:
49 	err = i915_gem_object_lock(tl->hwsp_ggtt->obj, &ww);
50 	if (!err)
51 		err = intel_timeline_pin(tl, &ww);
52 
53 	if (err == -EDEADLK) {
54 		err = i915_gem_ww_ctx_backoff(&ww);
55 		if (!err)
56 			goto retry;
57 	}
58 	i915_gem_ww_ctx_fini(&ww);
59 	return err;
60 }
61 
62 /* Only half of seqno's are usable, see __intel_timeline_get_seqno() */
63 #define CACHELINES_PER_PAGE (PAGE_SIZE / TIMELINE_SEQNO_BYTES / 2)
64 
65 struct mock_hwsp_freelist {
66 	struct intel_gt *gt;
67 	struct radix_tree_root cachelines;
68 	struct intel_timeline **history;
69 	unsigned long count, max;
70 	struct rnd_state prng;
71 };
72 
73 enum {
74 	SHUFFLE = BIT(0),
75 };
76 
77 static void __mock_hwsp_record(struct mock_hwsp_freelist *state,
78 			       unsigned int idx,
79 			       struct intel_timeline *tl)
80 {
81 	tl = xchg(&state->history[idx], tl);
82 	if (tl) {
83 		radix_tree_delete(&state->cachelines, hwsp_cacheline(tl));
84 		intel_timeline_unpin(tl);
85 		intel_timeline_put(tl);
86 	}
87 }
88 
89 static int __mock_hwsp_timeline(struct mock_hwsp_freelist *state,
90 				unsigned int count,
91 				unsigned int flags)
92 {
93 	struct intel_timeline *tl;
94 	unsigned int idx;
95 
96 	while (count--) {
97 		unsigned long cacheline;
98 		int err;
99 
100 		tl = intel_timeline_create(state->gt);
101 		if (IS_ERR(tl))
102 			return PTR_ERR(tl);
103 
104 		err = selftest_tl_pin(tl);
105 		if (err) {
106 			intel_timeline_put(tl);
107 			return err;
108 		}
109 
110 		cacheline = hwsp_cacheline(tl);
111 		err = radix_tree_insert(&state->cachelines, cacheline, tl);
112 		if (err) {
113 			if (err == -EEXIST) {
114 				pr_err("HWSP cacheline %lu already used; duplicate allocation!\n",
115 				       cacheline);
116 			}
117 			intel_timeline_unpin(tl);
118 			intel_timeline_put(tl);
119 			return err;
120 		}
121 
122 		idx = state->count++ % state->max;
123 		__mock_hwsp_record(state, idx, tl);
124 	}
125 
126 	if (flags & SHUFFLE)
127 		i915_prandom_shuffle(state->history,
128 				     sizeof(*state->history),
129 				     min(state->count, state->max),
130 				     &state->prng);
131 
132 	count = i915_prandom_u32_max_state(min(state->count, state->max),
133 					   &state->prng);
134 	while (count--) {
135 		idx = --state->count % state->max;
136 		__mock_hwsp_record(state, idx, NULL);
137 	}
138 
139 	return 0;
140 }
141 
142 static int mock_hwsp_freelist(void *arg)
143 {
144 	struct mock_hwsp_freelist state;
145 	struct drm_i915_private *i915;
146 	const struct {
147 		const char *name;
148 		unsigned int flags;
149 	} phases[] = {
150 		{ "linear", 0 },
151 		{ "shuffled", SHUFFLE },
152 		{ },
153 	}, *p;
154 	unsigned int na;
155 	int err = 0;
156 
157 	i915 = mock_gem_device();
158 	if (!i915)
159 		return -ENOMEM;
160 
161 	INIT_RADIX_TREE(&state.cachelines, GFP_KERNEL);
162 	state.prng = I915_RND_STATE_INITIALIZER(i915_selftest.random_seed);
163 
164 	state.gt = to_gt(i915);
165 
166 	/*
167 	 * Create a bunch of timelines and check that their HWSP do not overlap.
168 	 * Free some, and try again.
169 	 */
170 
171 	state.max = PAGE_SIZE / sizeof(*state.history);
172 	state.count = 0;
173 	state.history = kcalloc(state.max, sizeof(*state.history), GFP_KERNEL);
174 	if (!state.history) {
175 		err = -ENOMEM;
176 		goto err_put;
177 	}
178 
179 	for (p = phases; p->name; p++) {
180 		pr_debug("%s(%s)\n", __func__, p->name);
181 		for_each_prime_number_from(na, 1, 2 * CACHELINES_PER_PAGE) {
182 			err = __mock_hwsp_timeline(&state, na, p->flags);
183 			if (err)
184 				goto out;
185 		}
186 	}
187 
188 out:
189 	for (na = 0; na < state.max; na++)
190 		__mock_hwsp_record(&state, na, NULL);
191 	kfree(state.history);
192 err_put:
193 	mock_destroy_device(i915);
194 	return err;
195 }
196 
197 struct __igt_sync {
198 	const char *name;
199 	u32 seqno;
200 	bool expected;
201 	bool set;
202 };
203 
204 static int __igt_sync(struct intel_timeline *tl,
205 		      u64 ctx,
206 		      const struct __igt_sync *p,
207 		      const char *name)
208 {
209 	int ret;
210 
211 	if (__intel_timeline_sync_is_later(tl, ctx, p->seqno) != p->expected) {
212 		pr_err("%s: %s(ctx=%llu, seqno=%u) expected passed %s but failed\n",
213 		       name, p->name, ctx, p->seqno, str_yes_no(p->expected));
214 		return -EINVAL;
215 	}
216 
217 	if (p->set) {
218 		ret = __intel_timeline_sync_set(tl, ctx, p->seqno);
219 		if (ret)
220 			return ret;
221 	}
222 
223 	return 0;
224 }
225 
226 static int igt_sync(void *arg)
227 {
228 	const struct __igt_sync pass[] = {
229 		{ "unset", 0, false, false },
230 		{ "new", 0, false, true },
231 		{ "0a", 0, true, true },
232 		{ "1a", 1, false, true },
233 		{ "1b", 1, true, true },
234 		{ "0b", 0, true, false },
235 		{ "2a", 2, false, true },
236 		{ "4", 4, false, true },
237 		{ "INT_MAX", INT_MAX, false, true },
238 		{ "INT_MAX-1", INT_MAX-1, true, false },
239 		{ "INT_MAX+1", (u32)INT_MAX+1, false, true },
240 		{ "INT_MAX", INT_MAX, true, false },
241 		{ "UINT_MAX", UINT_MAX, false, true },
242 		{ "wrap", 0, false, true },
243 		{ "unwrap", UINT_MAX, true, false },
244 		{},
245 	}, *p;
246 	struct intel_timeline tl;
247 	int order, offset;
248 	int ret = -ENODEV;
249 
250 	mock_timeline_init(&tl, 0);
251 	for (p = pass; p->name; p++) {
252 		for (order = 1; order < 64; order++) {
253 			for (offset = -1; offset <= (order > 1); offset++) {
254 				u64 ctx = BIT_ULL(order) + offset;
255 
256 				ret = __igt_sync(&tl, ctx, p, "1");
257 				if (ret)
258 					goto out;
259 			}
260 		}
261 	}
262 	mock_timeline_fini(&tl);
263 
264 	mock_timeline_init(&tl, 0);
265 	for (order = 1; order < 64; order++) {
266 		for (offset = -1; offset <= (order > 1); offset++) {
267 			u64 ctx = BIT_ULL(order) + offset;
268 
269 			for (p = pass; p->name; p++) {
270 				ret = __igt_sync(&tl, ctx, p, "2");
271 				if (ret)
272 					goto out;
273 			}
274 		}
275 	}
276 
277 out:
278 	mock_timeline_fini(&tl);
279 	return ret;
280 }
281 
282 static unsigned int random_engine(struct rnd_state *rnd)
283 {
284 	return i915_prandom_u32_max_state(I915_NUM_ENGINES, rnd);
285 }
286 
287 static int bench_sync(void *arg)
288 {
289 	struct rnd_state prng;
290 	struct intel_timeline tl;
291 	unsigned long end_time, count;
292 	u64 prng32_1M;
293 	ktime_t kt;
294 	int order, last_order;
295 
296 	mock_timeline_init(&tl, 0);
297 
298 	/* Lookups from cache are very fast and so the random number generation
299 	 * and the loop itself becomes a significant factor in the per-iteration
300 	 * timings. We try to compensate the results by measuring the overhead
301 	 * of the prng and subtract it from the reported results.
302 	 */
303 	prandom_seed_state(&prng, i915_selftest.random_seed);
304 	count = 0;
305 	kt = ktime_get();
306 	end_time = jiffies + HZ/10;
307 	do {
308 		u32 x;
309 
310 		/* Make sure the compiler doesn't optimise away the prng call */
311 		WRITE_ONCE(x, prandom_u32_state(&prng));
312 
313 		count++;
314 	} while (!time_after(jiffies, end_time));
315 	kt = ktime_sub(ktime_get(), kt);
316 	pr_debug("%s: %lu random evaluations, %lluns/prng\n",
317 		 __func__, count, (long long)div64_ul(ktime_to_ns(kt), count));
318 	prng32_1M = div64_ul(ktime_to_ns(kt) << 20, count);
319 
320 	/* Benchmark (only) setting random context ids */
321 	prandom_seed_state(&prng, i915_selftest.random_seed);
322 	count = 0;
323 	kt = ktime_get();
324 	end_time = jiffies + HZ/10;
325 	do {
326 		u64 id = i915_prandom_u64_state(&prng);
327 
328 		__intel_timeline_sync_set(&tl, id, 0);
329 		count++;
330 	} while (!time_after(jiffies, end_time));
331 	kt = ktime_sub(ktime_get(), kt);
332 	kt = ktime_sub_ns(kt, (count * prng32_1M * 2) >> 20);
333 	pr_info("%s: %lu random insertions, %lluns/insert\n",
334 		__func__, count, (long long)div64_ul(ktime_to_ns(kt), count));
335 
336 	/* Benchmark looking up the exact same context ids as we just set */
337 	prandom_seed_state(&prng, i915_selftest.random_seed);
338 	end_time = count;
339 	kt = ktime_get();
340 	while (end_time--) {
341 		u64 id = i915_prandom_u64_state(&prng);
342 
343 		if (!__intel_timeline_sync_is_later(&tl, id, 0)) {
344 			mock_timeline_fini(&tl);
345 			pr_err("Lookup of %llu failed\n", id);
346 			return -EINVAL;
347 		}
348 	}
349 	kt = ktime_sub(ktime_get(), kt);
350 	kt = ktime_sub_ns(kt, (count * prng32_1M * 2) >> 20);
351 	pr_info("%s: %lu random lookups, %lluns/lookup\n",
352 		__func__, count, (long long)div64_ul(ktime_to_ns(kt), count));
353 
354 	mock_timeline_fini(&tl);
355 	cond_resched();
356 
357 	mock_timeline_init(&tl, 0);
358 
359 	/* Benchmark setting the first N (in order) contexts */
360 	count = 0;
361 	kt = ktime_get();
362 	end_time = jiffies + HZ/10;
363 	do {
364 		__intel_timeline_sync_set(&tl, count++, 0);
365 	} while (!time_after(jiffies, end_time));
366 	kt = ktime_sub(ktime_get(), kt);
367 	pr_info("%s: %lu in-order insertions, %lluns/insert\n",
368 		__func__, count, (long long)div64_ul(ktime_to_ns(kt), count));
369 
370 	/* Benchmark looking up the exact same context ids as we just set */
371 	end_time = count;
372 	kt = ktime_get();
373 	while (end_time--) {
374 		if (!__intel_timeline_sync_is_later(&tl, end_time, 0)) {
375 			pr_err("Lookup of %lu failed\n", end_time);
376 			mock_timeline_fini(&tl);
377 			return -EINVAL;
378 		}
379 	}
380 	kt = ktime_sub(ktime_get(), kt);
381 	pr_info("%s: %lu in-order lookups, %lluns/lookup\n",
382 		__func__, count, (long long)div64_ul(ktime_to_ns(kt), count));
383 
384 	mock_timeline_fini(&tl);
385 	cond_resched();
386 
387 	mock_timeline_init(&tl, 0);
388 
389 	/* Benchmark searching for a random context id and maybe changing it */
390 	prandom_seed_state(&prng, i915_selftest.random_seed);
391 	count = 0;
392 	kt = ktime_get();
393 	end_time = jiffies + HZ/10;
394 	do {
395 		u32 id = random_engine(&prng);
396 		u32 seqno = prandom_u32_state(&prng);
397 
398 		if (!__intel_timeline_sync_is_later(&tl, id, seqno))
399 			__intel_timeline_sync_set(&tl, id, seqno);
400 
401 		count++;
402 	} while (!time_after(jiffies, end_time));
403 	kt = ktime_sub(ktime_get(), kt);
404 	kt = ktime_sub_ns(kt, (count * prng32_1M * 2) >> 20);
405 	pr_info("%s: %lu repeated insert/lookups, %lluns/op\n",
406 		__func__, count, (long long)div64_ul(ktime_to_ns(kt), count));
407 	mock_timeline_fini(&tl);
408 	cond_resched();
409 
410 	/* Benchmark searching for a known context id and changing the seqno */
411 	for (last_order = 1, order = 1; order < 32;
412 	     ({ int tmp = last_order; last_order = order; order += tmp; })) {
413 		unsigned int mask = BIT(order) - 1;
414 
415 		mock_timeline_init(&tl, 0);
416 
417 		count = 0;
418 		kt = ktime_get();
419 		end_time = jiffies + HZ/10;
420 		do {
421 			/* Without assuming too many details of the underlying
422 			 * implementation, try to identify its phase-changes
423 			 * (if any)!
424 			 */
425 			u64 id = (u64)(count & mask) << order;
426 
427 			__intel_timeline_sync_is_later(&tl, id, 0);
428 			__intel_timeline_sync_set(&tl, id, 0);
429 
430 			count++;
431 		} while (!time_after(jiffies, end_time));
432 		kt = ktime_sub(ktime_get(), kt);
433 		pr_info("%s: %lu cyclic/%d insert/lookups, %lluns/op\n",
434 			__func__, count, order,
435 			(long long)div64_ul(ktime_to_ns(kt), count));
436 		mock_timeline_fini(&tl);
437 		cond_resched();
438 	}
439 
440 	return 0;
441 }
442 
443 int intel_timeline_mock_selftests(void)
444 {
445 	static const struct i915_subtest tests[] = {
446 		SUBTEST(mock_hwsp_freelist),
447 		SUBTEST(igt_sync),
448 		SUBTEST(bench_sync),
449 	};
450 
451 	return i915_subtests(tests, NULL);
452 }
453 
454 static int emit_ggtt_store_dw(struct i915_request *rq, u32 addr, u32 value)
455 {
456 	u32 *cs;
457 
458 	cs = intel_ring_begin(rq, 4);
459 	if (IS_ERR(cs))
460 		return PTR_ERR(cs);
461 
462 	if (GRAPHICS_VER(rq->engine->i915) >= 8) {
463 		*cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
464 		*cs++ = addr;
465 		*cs++ = 0;
466 		*cs++ = value;
467 	} else if (GRAPHICS_VER(rq->engine->i915) >= 4) {
468 		*cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
469 		*cs++ = 0;
470 		*cs++ = addr;
471 		*cs++ = value;
472 	} else {
473 		*cs++ = MI_STORE_DWORD_IMM | MI_MEM_VIRTUAL;
474 		*cs++ = addr;
475 		*cs++ = value;
476 		*cs++ = MI_NOOP;
477 	}
478 
479 	intel_ring_advance(rq, cs);
480 
481 	return 0;
482 }
483 
484 static struct i915_request *
485 checked_tl_write(struct intel_timeline *tl, struct intel_engine_cs *engine, u32 value)
486 {
487 	struct i915_request *rq;
488 	int err;
489 
490 	err = selftest_tl_pin(tl);
491 	if (err) {
492 		rq = ERR_PTR(err);
493 		goto out;
494 	}
495 
496 	if (READ_ONCE(*tl->hwsp_seqno) != tl->seqno) {
497 		pr_err("Timeline created with incorrect breadcrumb, found %x, expected %x\n",
498 		       *tl->hwsp_seqno, tl->seqno);
499 		intel_timeline_unpin(tl);
500 		return ERR_PTR(-EINVAL);
501 	}
502 
503 	rq = intel_engine_create_kernel_request(engine);
504 	if (IS_ERR(rq))
505 		goto out_unpin;
506 
507 	i915_request_get(rq);
508 
509 	err = emit_ggtt_store_dw(rq, tl->hwsp_offset, value);
510 	i915_request_add(rq);
511 	if (err) {
512 		i915_request_put(rq);
513 		rq = ERR_PTR(err);
514 	}
515 
516 out_unpin:
517 	intel_timeline_unpin(tl);
518 out:
519 	if (IS_ERR(rq))
520 		pr_err("Failed to write to timeline!\n");
521 	return rq;
522 }
523 
524 static int live_hwsp_engine(void *arg)
525 {
526 #define NUM_TIMELINES 4096
527 	struct intel_gt *gt = arg;
528 	struct intel_timeline **timelines;
529 	struct intel_engine_cs *engine;
530 	enum intel_engine_id id;
531 	unsigned long count, n;
532 	int err = 0;
533 
534 	/*
535 	 * Create a bunch of timelines and check we can write
536 	 * independently to each of their breadcrumb slots.
537 	 */
538 
539 	timelines = kvmalloc_array(NUM_TIMELINES * I915_NUM_ENGINES,
540 				   sizeof(*timelines),
541 				   GFP_KERNEL);
542 	if (!timelines)
543 		return -ENOMEM;
544 
545 	count = 0;
546 	for_each_engine(engine, gt, id) {
547 		if (!intel_engine_can_store_dword(engine))
548 			continue;
549 
550 		intel_engine_pm_get(engine);
551 
552 		for (n = 0; n < NUM_TIMELINES; n++) {
553 			struct intel_timeline *tl;
554 			struct i915_request *rq;
555 
556 			tl = intel_timeline_create(gt);
557 			if (IS_ERR(tl)) {
558 				err = PTR_ERR(tl);
559 				break;
560 			}
561 
562 			rq = checked_tl_write(tl, engine, count);
563 			if (IS_ERR(rq)) {
564 				intel_timeline_put(tl);
565 				err = PTR_ERR(rq);
566 				break;
567 			}
568 
569 			timelines[count++] = tl;
570 			i915_request_put(rq);
571 		}
572 
573 		intel_engine_pm_put(engine);
574 		if (err)
575 			break;
576 	}
577 
578 	if (igt_flush_test(gt->i915))
579 		err = -EIO;
580 
581 	for (n = 0; n < count; n++) {
582 		struct intel_timeline *tl = timelines[n];
583 
584 		if (!err && READ_ONCE(*tl->hwsp_seqno) != n) {
585 			GEM_TRACE_ERR("Invalid seqno:%lu stored in timeline %llu @ %x, found 0x%x\n",
586 				      n, tl->fence_context, tl->hwsp_offset, *tl->hwsp_seqno);
587 			GEM_TRACE_DUMP();
588 			err = -EINVAL;
589 		}
590 		intel_timeline_put(tl);
591 	}
592 
593 	kvfree(timelines);
594 	return err;
595 #undef NUM_TIMELINES
596 }
597 
598 static int live_hwsp_alternate(void *arg)
599 {
600 #define NUM_TIMELINES 4096
601 	struct intel_gt *gt = arg;
602 	struct intel_timeline **timelines;
603 	struct intel_engine_cs *engine;
604 	enum intel_engine_id id;
605 	unsigned long count, n;
606 	int err = 0;
607 
608 	/*
609 	 * Create a bunch of timelines and check we can write
610 	 * independently to each of their breadcrumb slots with adjacent
611 	 * engines.
612 	 */
613 
614 	timelines = kvmalloc_array(NUM_TIMELINES * I915_NUM_ENGINES,
615 				   sizeof(*timelines),
616 				   GFP_KERNEL);
617 	if (!timelines)
618 		return -ENOMEM;
619 
620 	count = 0;
621 	for (n = 0; n < NUM_TIMELINES; n++) {
622 		for_each_engine(engine, gt, id) {
623 			struct intel_timeline *tl;
624 			struct i915_request *rq;
625 
626 			if (!intel_engine_can_store_dword(engine))
627 				continue;
628 
629 			tl = intel_timeline_create(gt);
630 			if (IS_ERR(tl)) {
631 				err = PTR_ERR(tl);
632 				goto out;
633 			}
634 
635 			intel_engine_pm_get(engine);
636 			rq = checked_tl_write(tl, engine, count);
637 			intel_engine_pm_put(engine);
638 			if (IS_ERR(rq)) {
639 				intel_timeline_put(tl);
640 				err = PTR_ERR(rq);
641 				goto out;
642 			}
643 
644 			timelines[count++] = tl;
645 			i915_request_put(rq);
646 		}
647 	}
648 
649 out:
650 	if (igt_flush_test(gt->i915))
651 		err = -EIO;
652 
653 	for (n = 0; n < count; n++) {
654 		struct intel_timeline *tl = timelines[n];
655 
656 		if (!err && READ_ONCE(*tl->hwsp_seqno) != n) {
657 			GEM_TRACE_ERR("Invalid seqno:%lu stored in timeline %llu @ %x, found 0x%x\n",
658 				      n, tl->fence_context, tl->hwsp_offset, *tl->hwsp_seqno);
659 			GEM_TRACE_DUMP();
660 			err = -EINVAL;
661 		}
662 		intel_timeline_put(tl);
663 	}
664 
665 	kvfree(timelines);
666 	return err;
667 #undef NUM_TIMELINES
668 }
669 
670 static int live_hwsp_wrap(void *arg)
671 {
672 	struct intel_gt *gt = arg;
673 	struct intel_engine_cs *engine;
674 	struct intel_timeline *tl;
675 	enum intel_engine_id id;
676 	int err = 0;
677 
678 	/*
679 	 * Across a seqno wrap, we need to keep the old cacheline alive for
680 	 * foreign GPU references.
681 	 */
682 
683 	tl = intel_timeline_create(gt);
684 	if (IS_ERR(tl))
685 		return PTR_ERR(tl);
686 
687 	if (!tl->has_initial_breadcrumb)
688 		goto out_free;
689 
690 	err = selftest_tl_pin(tl);
691 	if (err)
692 		goto out_free;
693 
694 	for_each_engine(engine, gt, id) {
695 		const u32 *hwsp_seqno[2];
696 		struct i915_request *rq;
697 		u32 seqno[2];
698 
699 		if (!intel_engine_can_store_dword(engine))
700 			continue;
701 
702 		rq = intel_engine_create_kernel_request(engine);
703 		if (IS_ERR(rq)) {
704 			err = PTR_ERR(rq);
705 			goto out;
706 		}
707 
708 		tl->seqno = -4u;
709 
710 		mutex_lock_nested(&tl->mutex, SINGLE_DEPTH_NESTING);
711 		err = intel_timeline_get_seqno(tl, rq, &seqno[0]);
712 		mutex_unlock(&tl->mutex);
713 		if (err) {
714 			i915_request_add(rq);
715 			goto out;
716 		}
717 		pr_debug("seqno[0]:%08x, hwsp_offset:%08x\n",
718 			 seqno[0], tl->hwsp_offset);
719 
720 		err = emit_ggtt_store_dw(rq, tl->hwsp_offset, seqno[0]);
721 		if (err) {
722 			i915_request_add(rq);
723 			goto out;
724 		}
725 		hwsp_seqno[0] = tl->hwsp_seqno;
726 
727 		mutex_lock_nested(&tl->mutex, SINGLE_DEPTH_NESTING);
728 		err = intel_timeline_get_seqno(tl, rq, &seqno[1]);
729 		mutex_unlock(&tl->mutex);
730 		if (err) {
731 			i915_request_add(rq);
732 			goto out;
733 		}
734 		pr_debug("seqno[1]:%08x, hwsp_offset:%08x\n",
735 			 seqno[1], tl->hwsp_offset);
736 
737 		err = emit_ggtt_store_dw(rq, tl->hwsp_offset, seqno[1]);
738 		if (err) {
739 			i915_request_add(rq);
740 			goto out;
741 		}
742 		hwsp_seqno[1] = tl->hwsp_seqno;
743 
744 		/* With wrap should come a new hwsp */
745 		GEM_BUG_ON(seqno[1] >= seqno[0]);
746 		GEM_BUG_ON(hwsp_seqno[0] == hwsp_seqno[1]);
747 
748 		i915_request_add(rq);
749 
750 		if (i915_request_wait(rq, 0, HZ / 5) < 0) {
751 			pr_err("Wait for timeline writes timed out!\n");
752 			err = -EIO;
753 			goto out;
754 		}
755 
756 		if (READ_ONCE(*hwsp_seqno[0]) != seqno[0] ||
757 		    READ_ONCE(*hwsp_seqno[1]) != seqno[1]) {
758 			pr_err("Bad timeline values: found (%x, %x), expected (%x, %x)\n",
759 			       *hwsp_seqno[0], *hwsp_seqno[1],
760 			       seqno[0], seqno[1]);
761 			err = -EINVAL;
762 			goto out;
763 		}
764 
765 		intel_gt_retire_requests(gt); /* recycle HWSP */
766 	}
767 
768 out:
769 	if (igt_flush_test(gt->i915))
770 		err = -EIO;
771 
772 	intel_timeline_unpin(tl);
773 out_free:
774 	intel_timeline_put(tl);
775 	return err;
776 }
777 
778 static int emit_read_hwsp(struct i915_request *rq,
779 			  u32 seqno, u32 hwsp,
780 			  u32 *addr)
781 {
782 	const u32 gpr = i915_mmio_reg_offset(GEN8_RING_CS_GPR(rq->engine->mmio_base, 0));
783 	u32 *cs;
784 
785 	cs = intel_ring_begin(rq, 12);
786 	if (IS_ERR(cs))
787 		return PTR_ERR(cs);
788 
789 	*cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
790 	*cs++ = *addr;
791 	*cs++ = 0;
792 	*cs++ = seqno;
793 	*addr += 4;
794 
795 	*cs++ = MI_LOAD_REGISTER_MEM_GEN8 | MI_USE_GGTT;
796 	*cs++ = gpr;
797 	*cs++ = hwsp;
798 	*cs++ = 0;
799 
800 	*cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT;
801 	*cs++ = gpr;
802 	*cs++ = *addr;
803 	*cs++ = 0;
804 	*addr += 4;
805 
806 	intel_ring_advance(rq, cs);
807 
808 	return 0;
809 }
810 
811 struct hwsp_watcher {
812 	struct i915_vma *vma;
813 	struct i915_request *rq;
814 	u32 addr;
815 	u32 *map;
816 };
817 
818 static bool cmp_lt(u32 a, u32 b)
819 {
820 	return a < b;
821 }
822 
823 static bool cmp_gte(u32 a, u32 b)
824 {
825 	return a >= b;
826 }
827 
828 static int setup_watcher(struct hwsp_watcher *w, struct intel_gt *gt,
829 			 struct intel_timeline *tl)
830 {
831 	struct drm_i915_gem_object *obj;
832 	struct i915_vma *vma;
833 
834 	obj = i915_gem_object_create_internal(gt->i915, SZ_2M);
835 	if (IS_ERR(obj))
836 		return PTR_ERR(obj);
837 
838 	/* keep the same cache settings as timeline */
839 	i915_gem_object_set_cache_coherency(obj, tl->hwsp_ggtt->obj->cache_level);
840 	w->map = i915_gem_object_pin_map_unlocked(obj,
841 						  page_unmask_bits(tl->hwsp_ggtt->obj->mm.mapping));
842 	if (IS_ERR(w->map)) {
843 		i915_gem_object_put(obj);
844 		return PTR_ERR(w->map);
845 	}
846 
847 	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
848 	if (IS_ERR(vma)) {
849 		i915_gem_object_put(obj);
850 		return PTR_ERR(vma);
851 	}
852 
853 	w->vma = vma;
854 	w->addr = i915_ggtt_offset(vma);
855 	return 0;
856 }
857 
858 static void switch_tl_lock(struct i915_request *from, struct i915_request *to)
859 {
860 	/* some light mutex juggling required; think co-routines */
861 
862 	if (from) {
863 		lockdep_unpin_lock(&from->context->timeline->mutex, from->cookie);
864 		mutex_unlock(&from->context->timeline->mutex);
865 	}
866 
867 	if (to) {
868 		mutex_lock(&to->context->timeline->mutex);
869 		to->cookie = lockdep_pin_lock(&to->context->timeline->mutex);
870 	}
871 }
872 
873 static int create_watcher(struct hwsp_watcher *w,
874 			  struct intel_engine_cs *engine,
875 			  int ringsz)
876 {
877 	struct intel_context *ce;
878 
879 	ce = intel_context_create(engine);
880 	if (IS_ERR(ce))
881 		return PTR_ERR(ce);
882 
883 	ce->ring_size = ringsz;
884 	w->rq = intel_context_create_request(ce);
885 	intel_context_put(ce);
886 	if (IS_ERR(w->rq))
887 		return PTR_ERR(w->rq);
888 
889 	w->addr = i915_ggtt_offset(w->vma);
890 
891 	switch_tl_lock(w->rq, NULL);
892 
893 	return 0;
894 }
895 
896 static int check_watcher(struct hwsp_watcher *w, const char *name,
897 			 bool (*op)(u32 hwsp, u32 seqno))
898 {
899 	struct i915_request *rq = fetch_and_zero(&w->rq);
900 	u32 offset, end;
901 	int err;
902 
903 	GEM_BUG_ON(w->addr - i915_ggtt_offset(w->vma) > w->vma->size);
904 
905 	i915_request_get(rq);
906 	switch_tl_lock(NULL, rq);
907 	i915_request_add(rq);
908 
909 	if (i915_request_wait(rq, 0, HZ) < 0) {
910 		err = -ETIME;
911 		goto out;
912 	}
913 
914 	err = 0;
915 	offset = 0;
916 	end = (w->addr - i915_ggtt_offset(w->vma)) / sizeof(*w->map);
917 	while (offset < end) {
918 		if (!op(w->map[offset + 1], w->map[offset])) {
919 			pr_err("Watcher '%s' found HWSP value %x for seqno %x\n",
920 			       name, w->map[offset + 1], w->map[offset]);
921 			err = -EINVAL;
922 		}
923 
924 		offset += 2;
925 	}
926 
927 out:
928 	i915_request_put(rq);
929 	return err;
930 }
931 
932 static void cleanup_watcher(struct hwsp_watcher *w)
933 {
934 	if (w->rq) {
935 		switch_tl_lock(NULL, w->rq);
936 
937 		i915_request_add(w->rq);
938 	}
939 
940 	i915_vma_unpin_and_release(&w->vma, I915_VMA_RELEASE_MAP);
941 }
942 
943 static bool retire_requests(struct intel_timeline *tl)
944 {
945 	struct i915_request *rq, *rn;
946 
947 	mutex_lock(&tl->mutex);
948 	list_for_each_entry_safe(rq, rn, &tl->requests, link)
949 		if (!i915_request_retire(rq))
950 			break;
951 	mutex_unlock(&tl->mutex);
952 
953 	return !i915_active_fence_isset(&tl->last_request);
954 }
955 
956 static struct i915_request *wrap_timeline(struct i915_request *rq)
957 {
958 	struct intel_context *ce = rq->context;
959 	struct intel_timeline *tl = ce->timeline;
960 	u32 seqno = rq->fence.seqno;
961 
962 	while (tl->seqno >= seqno) { /* Cause a wrap */
963 		i915_request_put(rq);
964 		rq = intel_context_create_request(ce);
965 		if (IS_ERR(rq))
966 			return rq;
967 
968 		i915_request_get(rq);
969 		i915_request_add(rq);
970 	}
971 
972 	i915_request_put(rq);
973 	rq = i915_request_create(ce);
974 	if (IS_ERR(rq))
975 		return rq;
976 
977 	i915_request_get(rq);
978 	i915_request_add(rq);
979 
980 	return rq;
981 }
982 
983 static int live_hwsp_read(void *arg)
984 {
985 	struct intel_gt *gt = arg;
986 	struct hwsp_watcher watcher[2] = {};
987 	struct intel_engine_cs *engine;
988 	struct intel_timeline *tl;
989 	enum intel_engine_id id;
990 	int err = 0;
991 	int i;
992 
993 	/*
994 	 * If we take a reference to the HWSP for reading on the GPU, that
995 	 * read may be arbitrarily delayed (either by foreign fence or
996 	 * priority saturation) and a wrap can happen within 30 minutes.
997 	 * When the GPU read is finally submitted it should be correct,
998 	 * even across multiple wraps.
999 	 */
1000 
1001 	if (GRAPHICS_VER(gt->i915) < 8) /* CS convenience [SRM/LRM] */
1002 		return 0;
1003 
1004 	tl = intel_timeline_create(gt);
1005 	if (IS_ERR(tl))
1006 		return PTR_ERR(tl);
1007 
1008 	if (!tl->has_initial_breadcrumb)
1009 		goto out_free;
1010 
1011 	selftest_tl_pin(tl);
1012 
1013 	for (i = 0; i < ARRAY_SIZE(watcher); i++) {
1014 		err = setup_watcher(&watcher[i], gt, tl);
1015 		if (err)
1016 			goto out;
1017 	}
1018 
1019 	for_each_engine(engine, gt, id) {
1020 		struct intel_context *ce;
1021 		unsigned long count = 0;
1022 		IGT_TIMEOUT(end_time);
1023 
1024 		/* Create a request we can use for remote reading of the HWSP */
1025 		err = create_watcher(&watcher[1], engine, SZ_512K);
1026 		if (err)
1027 			goto out;
1028 
1029 		do {
1030 			struct i915_sw_fence *submit;
1031 			struct i915_request *rq;
1032 			u32 hwsp, dummy;
1033 
1034 			submit = heap_fence_create(GFP_KERNEL);
1035 			if (!submit) {
1036 				err = -ENOMEM;
1037 				goto out;
1038 			}
1039 
1040 			err = create_watcher(&watcher[0], engine, SZ_4K);
1041 			if (err)
1042 				goto out;
1043 
1044 			ce = intel_context_create(engine);
1045 			if (IS_ERR(ce)) {
1046 				err = PTR_ERR(ce);
1047 				goto out;
1048 			}
1049 
1050 			ce->timeline = intel_timeline_get(tl);
1051 
1052 			/* Ensure timeline is mapped, done during first pin */
1053 			err = intel_context_pin(ce);
1054 			if (err) {
1055 				intel_context_put(ce);
1056 				goto out;
1057 			}
1058 
1059 			/*
1060 			 * Start at a new wrap, and set seqno right before another wrap,
1061 			 * saving 30 minutes of nops
1062 			 */
1063 			tl->seqno = -12u + 2 * (count & 3);
1064 			__intel_timeline_get_seqno(tl, &dummy);
1065 
1066 			rq = i915_request_create(ce);
1067 			if (IS_ERR(rq)) {
1068 				err = PTR_ERR(rq);
1069 				intel_context_unpin(ce);
1070 				intel_context_put(ce);
1071 				goto out;
1072 			}
1073 
1074 			err = i915_sw_fence_await_dma_fence(&rq->submit,
1075 							    &watcher[0].rq->fence, 0,
1076 							    GFP_KERNEL);
1077 			if (err < 0) {
1078 				i915_request_add(rq);
1079 				intel_context_unpin(ce);
1080 				intel_context_put(ce);
1081 				goto out;
1082 			}
1083 
1084 			switch_tl_lock(rq, watcher[0].rq);
1085 			err = intel_timeline_read_hwsp(rq, watcher[0].rq, &hwsp);
1086 			if (err == 0)
1087 				err = emit_read_hwsp(watcher[0].rq, /* before */
1088 						     rq->fence.seqno, hwsp,
1089 						     &watcher[0].addr);
1090 			switch_tl_lock(watcher[0].rq, rq);
1091 			if (err) {
1092 				i915_request_add(rq);
1093 				intel_context_unpin(ce);
1094 				intel_context_put(ce);
1095 				goto out;
1096 			}
1097 
1098 			switch_tl_lock(rq, watcher[1].rq);
1099 			err = intel_timeline_read_hwsp(rq, watcher[1].rq, &hwsp);
1100 			if (err == 0)
1101 				err = emit_read_hwsp(watcher[1].rq, /* after */
1102 						     rq->fence.seqno, hwsp,
1103 						     &watcher[1].addr);
1104 			switch_tl_lock(watcher[1].rq, rq);
1105 			if (err) {
1106 				i915_request_add(rq);
1107 				intel_context_unpin(ce);
1108 				intel_context_put(ce);
1109 				goto out;
1110 			}
1111 
1112 			i915_request_get(rq);
1113 			i915_request_add(rq);
1114 
1115 			rq = wrap_timeline(rq);
1116 			intel_context_unpin(ce);
1117 			intel_context_put(ce);
1118 			if (IS_ERR(rq)) {
1119 				err = PTR_ERR(rq);
1120 				goto out;
1121 			}
1122 
1123 			err = i915_sw_fence_await_dma_fence(&watcher[1].rq->submit,
1124 							    &rq->fence, 0,
1125 							    GFP_KERNEL);
1126 			if (err < 0) {
1127 				i915_request_put(rq);
1128 				goto out;
1129 			}
1130 
1131 			err = check_watcher(&watcher[0], "before", cmp_lt);
1132 			i915_sw_fence_commit(submit);
1133 			heap_fence_put(submit);
1134 			if (err) {
1135 				i915_request_put(rq);
1136 				goto out;
1137 			}
1138 			count++;
1139 
1140 			/* Flush the timeline before manually wrapping again */
1141 			if (i915_request_wait(rq,
1142 					      I915_WAIT_INTERRUPTIBLE,
1143 					      HZ) < 0) {
1144 				err = -ETIME;
1145 				i915_request_put(rq);
1146 				goto out;
1147 			}
1148 			retire_requests(tl);
1149 			i915_request_put(rq);
1150 
1151 			/* Single requests are limited to half a ring at most */
1152 			if (8 * watcher[1].rq->ring->emit >
1153 			    3 * watcher[1].rq->ring->size)
1154 				break;
1155 
1156 		} while (!__igt_timeout(end_time, NULL) &&
1157 			 count < (PAGE_SIZE / TIMELINE_SEQNO_BYTES - 1) / 2);
1158 
1159 		pr_info("%s: simulated %lu wraps\n", engine->name, count);
1160 		err = check_watcher(&watcher[1], "after", cmp_gte);
1161 		if (err)
1162 			goto out;
1163 	}
1164 
1165 out:
1166 	for (i = 0; i < ARRAY_SIZE(watcher); i++)
1167 		cleanup_watcher(&watcher[i]);
1168 
1169 	intel_timeline_unpin(tl);
1170 
1171 	if (igt_flush_test(gt->i915))
1172 		err = -EIO;
1173 
1174 out_free:
1175 	intel_timeline_put(tl);
1176 	return err;
1177 }
1178 
1179 static int live_hwsp_rollover_kernel(void *arg)
1180 {
1181 	struct intel_gt *gt = arg;
1182 	struct intel_engine_cs *engine;
1183 	enum intel_engine_id id;
1184 	int err = 0;
1185 
1186 	/*
1187 	 * Run the host for long enough, and even the kernel context will
1188 	 * see a seqno rollover.
1189 	 */
1190 
1191 	for_each_engine(engine, gt, id) {
1192 		struct intel_context *ce = engine->kernel_context;
1193 		struct intel_timeline *tl = ce->timeline;
1194 		struct i915_request *rq[3] = {};
1195 		int i;
1196 
1197 		st_engine_heartbeat_disable(engine);
1198 		if (intel_gt_wait_for_idle(gt, HZ / 2)) {
1199 			err = -EIO;
1200 			goto out;
1201 		}
1202 
1203 		GEM_BUG_ON(i915_active_fence_isset(&tl->last_request));
1204 		tl->seqno = -2u;
1205 		WRITE_ONCE(*(u32 *)tl->hwsp_seqno, tl->seqno);
1206 
1207 		for (i = 0; i < ARRAY_SIZE(rq); i++) {
1208 			struct i915_request *this;
1209 
1210 			this = i915_request_create(ce);
1211 			if (IS_ERR(this)) {
1212 				err = PTR_ERR(this);
1213 				goto out;
1214 			}
1215 
1216 			pr_debug("%s: create fence.seqnp:%d\n",
1217 				 engine->name,
1218 				 lower_32_bits(this->fence.seqno));
1219 
1220 			GEM_BUG_ON(rcu_access_pointer(this->timeline) != tl);
1221 
1222 			rq[i] = i915_request_get(this);
1223 			i915_request_add(this);
1224 		}
1225 
1226 		/* We expected a wrap! */
1227 		GEM_BUG_ON(rq[2]->fence.seqno > rq[0]->fence.seqno);
1228 
1229 		if (i915_request_wait(rq[2], 0, HZ / 5) < 0) {
1230 			pr_err("Wait for timeline wrap timed out!\n");
1231 			err = -EIO;
1232 			goto out;
1233 		}
1234 
1235 		for (i = 0; i < ARRAY_SIZE(rq); i++) {
1236 			if (!i915_request_completed(rq[i])) {
1237 				pr_err("Pre-wrap request not completed!\n");
1238 				err = -EINVAL;
1239 				goto out;
1240 			}
1241 		}
1242 
1243 out:
1244 		for (i = 0; i < ARRAY_SIZE(rq); i++)
1245 			i915_request_put(rq[i]);
1246 		st_engine_heartbeat_enable(engine);
1247 		if (err)
1248 			break;
1249 	}
1250 
1251 	if (igt_flush_test(gt->i915))
1252 		err = -EIO;
1253 
1254 	return err;
1255 }
1256 
1257 static int live_hwsp_rollover_user(void *arg)
1258 {
1259 	struct intel_gt *gt = arg;
1260 	struct intel_engine_cs *engine;
1261 	enum intel_engine_id id;
1262 	int err = 0;
1263 
1264 	/*
1265 	 * Simulate a long running user context, and force the seqno wrap
1266 	 * on the user's timeline.
1267 	 */
1268 
1269 	for_each_engine(engine, gt, id) {
1270 		struct i915_request *rq[3] = {};
1271 		struct intel_timeline *tl;
1272 		struct intel_context *ce;
1273 		int i;
1274 
1275 		ce = intel_context_create(engine);
1276 		if (IS_ERR(ce))
1277 			return PTR_ERR(ce);
1278 
1279 		err = intel_context_alloc_state(ce);
1280 		if (err)
1281 			goto out;
1282 
1283 		tl = ce->timeline;
1284 		if (!tl->has_initial_breadcrumb)
1285 			goto out;
1286 
1287 		err = intel_context_pin(ce);
1288 		if (err)
1289 			goto out;
1290 
1291 		tl->seqno = -4u;
1292 		WRITE_ONCE(*(u32 *)tl->hwsp_seqno, tl->seqno);
1293 
1294 		for (i = 0; i < ARRAY_SIZE(rq); i++) {
1295 			struct i915_request *this;
1296 
1297 			this = intel_context_create_request(ce);
1298 			if (IS_ERR(this)) {
1299 				err = PTR_ERR(this);
1300 				goto out_unpin;
1301 			}
1302 
1303 			pr_debug("%s: create fence.seqnp:%d\n",
1304 				 engine->name,
1305 				 lower_32_bits(this->fence.seqno));
1306 
1307 			GEM_BUG_ON(rcu_access_pointer(this->timeline) != tl);
1308 
1309 			rq[i] = i915_request_get(this);
1310 			i915_request_add(this);
1311 		}
1312 
1313 		/* We expected a wrap! */
1314 		GEM_BUG_ON(rq[2]->fence.seqno > rq[0]->fence.seqno);
1315 
1316 		if (i915_request_wait(rq[2], 0, HZ / 5) < 0) {
1317 			pr_err("Wait for timeline wrap timed out!\n");
1318 			err = -EIO;
1319 			goto out_unpin;
1320 		}
1321 
1322 		for (i = 0; i < ARRAY_SIZE(rq); i++) {
1323 			if (!i915_request_completed(rq[i])) {
1324 				pr_err("Pre-wrap request not completed!\n");
1325 				err = -EINVAL;
1326 				goto out_unpin;
1327 			}
1328 		}
1329 out_unpin:
1330 		intel_context_unpin(ce);
1331 out:
1332 		for (i = 0; i < ARRAY_SIZE(rq); i++)
1333 			i915_request_put(rq[i]);
1334 		intel_context_put(ce);
1335 		if (err)
1336 			break;
1337 	}
1338 
1339 	if (igt_flush_test(gt->i915))
1340 		err = -EIO;
1341 
1342 	return err;
1343 }
1344 
1345 static int live_hwsp_recycle(void *arg)
1346 {
1347 	struct intel_gt *gt = arg;
1348 	struct intel_engine_cs *engine;
1349 	enum intel_engine_id id;
1350 	unsigned long count;
1351 	int err = 0;
1352 
1353 	/*
1354 	 * Check seqno writes into one timeline at a time. We expect to
1355 	 * recycle the breadcrumb slot between iterations and neither
1356 	 * want to confuse ourselves or the GPU.
1357 	 */
1358 
1359 	count = 0;
1360 	for_each_engine(engine, gt, id) {
1361 		IGT_TIMEOUT(end_time);
1362 
1363 		if (!intel_engine_can_store_dword(engine))
1364 			continue;
1365 
1366 		intel_engine_pm_get(engine);
1367 
1368 		do {
1369 			struct intel_timeline *tl;
1370 			struct i915_request *rq;
1371 
1372 			tl = intel_timeline_create(gt);
1373 			if (IS_ERR(tl)) {
1374 				err = PTR_ERR(tl);
1375 				break;
1376 			}
1377 
1378 			rq = checked_tl_write(tl, engine, count);
1379 			if (IS_ERR(rq)) {
1380 				intel_timeline_put(tl);
1381 				err = PTR_ERR(rq);
1382 				break;
1383 			}
1384 
1385 			if (i915_request_wait(rq, 0, HZ / 5) < 0) {
1386 				pr_err("Wait for timeline writes timed out!\n");
1387 				i915_request_put(rq);
1388 				intel_timeline_put(tl);
1389 				err = -EIO;
1390 				break;
1391 			}
1392 
1393 			if (READ_ONCE(*tl->hwsp_seqno) != count) {
1394 				GEM_TRACE_ERR("Invalid seqno:%lu stored in timeline %llu @ %x found 0x%x\n",
1395 					      count, tl->fence_context,
1396 					      tl->hwsp_offset, *tl->hwsp_seqno);
1397 				GEM_TRACE_DUMP();
1398 				err = -EINVAL;
1399 			}
1400 
1401 			i915_request_put(rq);
1402 			intel_timeline_put(tl);
1403 			count++;
1404 
1405 			if (err)
1406 				break;
1407 		} while (!__igt_timeout(end_time, NULL));
1408 
1409 		intel_engine_pm_put(engine);
1410 		if (err)
1411 			break;
1412 	}
1413 
1414 	return err;
1415 }
1416 
1417 int intel_timeline_live_selftests(struct drm_i915_private *i915)
1418 {
1419 	static const struct i915_subtest tests[] = {
1420 		SUBTEST(live_hwsp_recycle),
1421 		SUBTEST(live_hwsp_engine),
1422 		SUBTEST(live_hwsp_alternate),
1423 		SUBTEST(live_hwsp_wrap),
1424 		SUBTEST(live_hwsp_read),
1425 		SUBTEST(live_hwsp_rollover_kernel),
1426 		SUBTEST(live_hwsp_rollover_user),
1427 	};
1428 
1429 	if (intel_gt_is_wedged(to_gt(i915)))
1430 		return 0;
1431 
1432 	return intel_gt_live_subtests(tests, to_gt(i915));
1433 }
1434