summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/panfrost/panfrost_job.c
blob: a8b4827dc4258633d13d5a0fb3d7e1b04a51a787 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
/* Copyright 2019 Collabora ltd. */
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/dma-resv.h>
#include <drm/gpu_scheduler.h>
#include <drm/panfrost_drm.h>

#include "panfrost_device.h"
#include "panfrost_devfreq.h"
#include "panfrost_job.h"
#include "panfrost_features.h"
#include "panfrost_issues.h"
#include "panfrost_gem.h"
#include "panfrost_regs.h"
#include "panfrost_gpu.h"
#include "panfrost_mmu.h"
#include "panfrost_dump.h"

#define JOB_TIMEOUT_MS 500

#define job_write(dev, reg, data) writel(data, dev->iomem + (reg))
#define job_read(dev, reg) readl(dev->iomem + (reg))

struct panfrost_queue_state {
	struct drm_gpu_scheduler sched;
	u64 fence_context;
	u64 emit_seqno;
};

struct panfrost_job_slot {
	struct panfrost_queue_state queue[NUM_JOB_SLOTS];
	spinlock_t job_lock;
	int irq;
};

static struct panfrost_job *
to_panfrost_job(struct drm_sched_job *sched_job)
{
	return container_of(sched_job, struct panfrost_job, base);
}

struct panfrost_fence {
	struct dma_fence base;
	struct drm_device *dev;
	/* panfrost seqno for signaled() test */
	u64 seqno;
	int queue;
};

static inline struct panfrost_fence *
to_panfrost_fence(struct dma_fence *fence)
{
	return (struct panfrost_fence *)fence;
}

static const char *panfrost_fence_get_driver_name(struct dma_fence *fence)
{
	return "panfrost";
}

static const char *panfrost_fence_get_timeline_name(struct dma_fence *fence)
{
	struct panfrost_fence *f = to_panfrost_fence(fence);

	switch (f->queue) {
	case 0:
		return "panfrost-js-0";
	case 1:
		return "panfrost-js-1";
	case 2:
		return "panfrost-js-2";
	default:
		return NULL;
	}
}

static const struct dma_fence_ops panfrost_fence_ops = {
	.get_driver_name = panfrost_fence_get_driver_name,
	.get_timeline_name = panfrost_fence_get_timeline_name,
};

static struct dma_fence *panfrost_fence_create(struct panfrost_device *pfdev, int js_num)
{
	struct panfrost_fence *fence;
	struct panfrost_job_slot *js = pfdev->js;

	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
	if (!fence)
		return ERR_PTR(-ENOMEM);

	fence->dev = pfdev->ddev;
	fence->queue = js_num;
	fence->seqno = ++js->queue[js_num].emit_seqno;
	dma_fence_init(&fence->base, &panfrost_fence_ops, &js->job_lock,
		       js->queue[js_num].fence_context, fence->seqno);

	return &fence->base;
}

int panfrost_job_get_slot(struct panfrost_job *job)
{
	/* JS0: fragment jobs.
	 * JS1: vertex/tiler jobs
	 * JS2: compute jobs
	 */
	if (job->requirements & PANFROST_JD_REQ_FS)
		return 0;

/* Not exposed to userspace yet */
#if 0
	if (job->requirements & PANFROST_JD_REQ_ONLY_COMPUTE) {
		if ((job->requirements & PANFROST_JD_REQ_CORE_GRP_MASK) &&
		    (job->pfdev->features.nr_core_groups == 2))
			return 2;
		if (panfrost_has_hw_issue(job->pfdev, HW_ISSUE_8987))
			return 2;
	}
#endif
	return 1;
}

static void panfrost_job_write_affinity(struct panfrost_device *pfdev,
					u32 requirements,
					int js)
{
	u64 affinity;

	/*
	 * Use all cores for now.
	 * Eventually we may need to support tiler only jobs and h/w with
	 * multiple (2) coherent core groups
	 */
	affinity = pfdev->features.shader_present;

	job_write(pfdev, JS_AFFINITY_NEXT_LO(js), lower_32_bits(affinity));
	job_write(pfdev, JS_AFFINITY_NEXT_HI(js), upper_32_bits(affinity));
}

static u32
panfrost_get_job_chain_flag(const struct panfrost_job *job)
{
	struct panfrost_fence *f = to_panfrost_fence(job->done_fence);

	if (!panfrost_has_hw_feature(job->pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION))
		return 0;

	return (f->seqno & 1) ? JS_CONFIG_JOB_CHAIN_FLAG : 0;
}

static struct panfrost_job *
panfrost_dequeue_job(struct panfrost_device *pfdev, int slot)
{
	struct panfrost_job *job = pfdev->jobs[slot][0];

	WARN_ON(!job);
	pfdev->jobs[slot][0] = pfdev->jobs[slot][1];
	pfdev->jobs[slot][1] = NULL;

	return job;
}

static unsigned int
panfrost_enqueue_job(struct panfrost_device *pfdev, int slot,
		     struct panfrost_job *job)
{
	if (WARN_ON(!job))
		return 0;

	if (!pfdev->jobs[slot][0]) {
		pfdev->jobs[slot][0] = job;
		return 0;
	}

	WARN_ON(pfdev->jobs[slot][1]);
	pfdev->jobs[slot][1] = job;
	WARN_ON(panfrost_get_job_chain_flag(job) ==
		panfrost_get_job_chain_flag(pfdev->jobs[slot][0]));
	return 1;
}

static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
{
	struct panfrost_device *pfdev = job->pfdev;
	unsigned int subslot;
	u32 cfg;
	u64 jc_head = job->jc;
	int ret;

	panfrost_devfreq_record_busy(&pfdev->pfdevfreq);

	ret = pm_runtime_get_sync(pfdev->dev);
	if (ret < 0)
		return;

	if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js)))) {
		return;
	}

	cfg = panfrost_mmu_as_get(pfdev, job->mmu);

	job_write(pfdev, JS_HEAD_NEXT_LO(js), lower_32_bits(jc_head));
	job_write(pfdev, JS_HEAD_NEXT_HI(js), upper_32_bits(jc_head));

	panfrost_job_write_affinity(pfdev, job->requirements, js);

	/* start MMU, medium priority, cache clean/flush on end, clean/flush on
	 * start */
	cfg |= JS_CONFIG_THREAD_PRI(8) |
		JS_CONFIG_START_FLUSH_CLEAN_INVALIDATE |
		JS_CONFIG_END_FLUSH_CLEAN_INVALIDATE |
		panfrost_get_job_chain_flag(job);

	if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION))
		cfg |= JS_CONFIG_ENABLE_FLUSH_REDUCTION;

	if (panfrost_has_hw_issue(pfdev, HW_ISSUE_10649))
		cfg |= JS_CONFIG_START_MMU;

	job_write(pfdev, JS_CONFIG_NEXT(js), cfg);

	if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION))
		job_write(pfdev, JS_FLUSH_ID_NEXT(js), job->flush_id);

	/* GO ! */

	spin_lock(&pfdev->js->job_lock);
	subslot = panfrost_enqueue_job(pfdev, js, job);
	/* Don't queue the job if a reset is in progress */
	if (!atomic_read(&pfdev->reset.pending)) {
		job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START);
		dev_dbg(pfdev->dev,
			"JS: Submitting atom %p to js[%d][%d] with head=0x%llx AS %d",
			job, js, subslot, jc_head, cfg & 0xf);
	}
	spin_unlock(&pfdev->js->job_lock);
}

static int panfrost_acquire_object_fences(struct drm_gem_object **bos,
					  int bo_count,
					  struct drm_sched_job *job)
{
	int i, ret;

	for (i = 0; i < bo_count; i++) {
		ret = dma_resv_reserve_fences(bos[i]->resv, 1);
		if (ret)
			return ret;

		/* panfrost always uses write mode in its current uapi */
		ret = drm_sched_job_add_implicit_dependencies(job, bos[i],
							      true);
		if (ret)
			return ret;
	}

	return 0;
}

static void panfrost_attach_object_fences(struct drm_gem_object **bos,
					  int bo_count,
					  struct dma_fence *fence)
{
	int i;

	for (i = 0; i < bo_count; i++)
		dma_resv_add_fence(bos[i]->resv, fence, DMA_RESV_USAGE_WRITE);
}

int panfrost_job_push(struct panfrost_job *job)
{
	struct panfrost_device *pfdev = job->pfdev;
	struct ww_acquire_ctx acquire_ctx;
	int ret = 0;

	ret = drm_gem_lock_reservations(job->bos, job->bo_count,
					    &acquire_ctx);
	if (ret)
		return ret;

	mutex_lock(&pfdev->sched_lock);
	drm_sched_job_arm(&job->base);

	job->render_done_fence = dma_fence_get(&job->base.s_fence->finished);

	ret = panfrost_acquire_object_fences(job->bos, job->bo_count,
					     &job->base);
	if (ret) {
		mutex_unlock(&pfdev->sched_lock);
		goto unlock;
	}

	kref_get(&job->refcount); /* put by scheduler job completion */

	drm_sched_entity_push_job(&job->base);

	mutex_unlock(&pfdev->sched_lock);

	panfrost_attach_object_fences(job->bos, job->bo_count,
				      job->render_done_fence);

unlock:
	drm_gem_unlock_reservations(job->bos, job->bo_count, &acquire_ctx);

	return ret;
}

static void panfrost_job_cleanup(struct kref *ref)
{
	struct panfrost_job *job = container_of(ref, struct panfrost_job,
						refcount);
	unsigned int i;

	dma_fence_put(job->done_fence);
	dma_fence_put(job->render_done_fence);

	if (job->mappings) {
		for (i = 0; i < job->bo_count; i++) {
			if (!job->mappings[i])
				break;

			atomic_dec(&job->mappings[i]->obj->gpu_usecount);
			panfrost_gem_mapping_put(job->mappings[i]);
		}
		kvfree(job->mappings);
	}

	if (job->bos) {
		for (i = 0; i < job->bo_count; i++)
			drm_gem_object_put(job->bos[i]);

		kvfree(job->bos);
	}

	kfree(job);
}

void panfrost_job_put(struct panfrost_job *job)
{
	kref_put(&job->refcount, panfrost_job_cleanup);
}

static void panfrost_job_free(struct drm_sched_job *sched_job)
{
	struct panfrost_job *job = to_panfrost_job(sched_job);

	drm_sched_job_cleanup(sched_job);

	panfrost_job_put(job);
}

static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
{
	struct panfrost_job *job = to_panfrost_job(sched_job);
	struct panfrost_device *pfdev = job->pfdev;
	int slot = panfrost_job_get_slot(job);
	struct dma_fence *fence = NULL;

	if (unlikely(job->base.s_fence->finished.error))
		return NULL;

	/* Nothing to execute: can happen if the job has finished while
	 * we were resetting the GPU.
	 */
	if (!job->jc)
		return NULL;

	fence = panfrost_fence_create(pfdev, slot);
	if (IS_ERR(fence))
		return fence;

	if (job->done_fence)
		dma_fence_put(job->done_fence);
	job->done_fence = dma_fence_get(fence);

	panfrost_job_hw_submit(job, slot);

	return fence;
}

void panfrost_job_enable_interrupts(struct panfrost_device *pfdev)
{
	int j;
	u32 irq_mask = 0;

	for (j = 0; j < NUM_JOB_SLOTS; j++) {
		irq_mask |= MK_JS_MASK(j);
	}

	job_write(pfdev, JOB_INT_CLEAR, irq_mask);
	job_write(pfdev, JOB_INT_MASK, irq_mask);
}

static void panfrost_job_handle_err(struct panfrost_device *pfdev,
				    struct panfrost_job *job,
				    unsigned int js)
{
	u32 js_status = job_read(pfdev, JS_STATUS(js));
	const char *exception_name = panfrost_exception_name(js_status);
	bool signal_fence = true;

	if (!panfrost_exception_is_fault(js_status)) {
		dev_dbg(pfdev->dev, "js event, js=%d, status=%s, head=0x%x, tail=0x%x",
			js, exception_name,
			job_read(pfdev, JS_HEAD_LO(js)),
			job_read(pfdev, JS_TAIL_LO(js)));
	} else {
		dev_err(pfdev->dev, "js fault, js=%d, status=%s, head=0x%x, tail=0x%x",
			js, exception_name,
			job_read(pfdev, JS_HEAD_LO(js)),
			job_read(pfdev, JS_TAIL_LO(js)));
	}

	if (js_status == DRM_PANFROST_EXCEPTION_STOPPED) {
		/* Update the job head so we can resume */
		job->jc = job_read(pfdev, JS_TAIL_LO(js)) |
			  ((u64)job_read(pfdev, JS_TAIL_HI(js)) << 32);

		/* The job will be resumed, don't signal the fence */
		signal_fence = false;
	} else if (js_status == DRM_PANFROST_EXCEPTION_TERMINATED) {
		/* Job has been hard-stopped, flag it as canceled */
		dma_fence_set_error(job->done_fence, -ECANCELED);
		job->jc = 0;
	} else if (panfrost_exception_is_fault(js_status)) {
		/* We might want to provide finer-grained error code based on
		 * the exception type, but unconditionally setting to EINVAL
		 * is good enough for now.
		 */
		dma_fence_set_error(job->done_fence, -EINVAL);
		job->jc = 0;
	}

	panfrost_mmu_as_put(pfdev, job->mmu);
	panfrost_devfreq_record_idle(&pfdev->pfdevfreq);

	if (signal_fence)
		dma_fence_signal_locked(job->done_fence);

	pm_runtime_put_autosuspend(pfdev->dev);

	if (panfrost_exception_needs_reset(pfdev, js_status)) {
		atomic_set(&pfdev->reset.pending, 1);
		drm_sched_fault(&pfdev->js->queue[js].sched);
	}
}

static void panfrost_job_handle_done(struct panfrost_device *pfdev,
				     struct panfrost_job *job)
{
	/* Set ->jc to 0 to avoid re-submitting an already finished job (can
	 * happen when we receive the DONE interrupt while doing a GPU reset).
	 */
	job->jc = 0;
	panfrost_mmu_as_put(pfdev, job->mmu);
	panfrost_devfreq_record_idle(&pfdev->pfdevfreq);

	dma_fence_signal_locked(job->done_fence);
	pm_runtime_put_autosuspend(pfdev->dev);
}

static void panfrost_job_handle_irq(struct panfrost_device *pfdev, u32 status)
{
	struct panfrost_job *done[NUM_JOB_SLOTS][2] = {};
	struct panfrost_job *failed[NUM_JOB_SLOTS] = {};
	u32 js_state = 0, js_events = 0;
	unsigned int i, j;

	/* First we collect all failed/done jobs. */
	while (status) {
		u32 js_state_mask = 0;

		for (j = 0; j < NUM_JOB_SLOTS; j++) {
			if (status & MK_JS_MASK(j))
				js_state_mask |= MK_JS_MASK(j);

			if (status & JOB_INT_MASK_DONE(j)) {
				if (done[j][0])
					done[j][1] = panfrost_dequeue_job(pfdev, j);
				else
					done[j][0] = panfrost_dequeue_job(pfdev, j);
			}

			if (status & JOB_INT_MASK_ERR(j)) {
				/* Cancel the next submission. Will be submitted
				 * after we're done handling this failure if
				 * there's no reset pending.
				 */
				job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_NOP);
				failed[j] = panfrost_dequeue_job(pfdev, j);
			}
		}

		/* JS_STATE is sampled when JOB_INT_CLEAR is written.
		 * For each BIT(slot) or BIT(slot + 16) bit written to
		 * JOB_INT_CLEAR, the corresponding bits in JS_STATE
		 * (BIT(slot) and BIT(slot + 16)) are updated, but this
		 * is racy. If we only have one job done at the time we
		 * read JOB_INT_RAWSTAT but the second job fails before we
		 * clear the status, we end up with a status containing
		 * only the DONE bit and consider both jobs as DONE since
		 * JS_STATE reports both NEXT and CURRENT as inactive.
		 * To prevent that, let's repeat this clear+read steps
		 * until status is 0.
		 */
		job_write(pfdev, JOB_INT_CLEAR, status);
		js_state &= ~js_state_mask;
		js_state |= job_read(pfdev, JOB_INT_JS_STATE) & js_state_mask;
		js_events |= status;
		status = job_read(pfdev, JOB_INT_RAWSTAT);
	}

	/* Then we handle the dequeued jobs. */
	for (j = 0; j < NUM_JOB_SLOTS; j++) {
		if (!(js_events & MK_JS_MASK(j)))
			continue;

		if (failed[j]) {
			panfrost_job_handle_err(pfdev, failed[j], j);
		} else if (pfdev->jobs[j][0] && !(js_state & MK_JS_MASK(j))) {
			/* When the current job doesn't fail, the JM dequeues
			 * the next job without waiting for an ACK, this means
			 * we can have 2 jobs dequeued and only catch the
			 * interrupt when the second one is done. If both slots
			 * are inactive, but one job remains in pfdev->jobs[j],
			 * consider it done. Of course that doesn't apply if a
			 * failure happened since we cancelled execution of the
			 * job in _NEXT (see above).
			 */
			if (WARN_ON(!done[j][0]))
				done[j][0] = panfrost_dequeue_job(pfdev, j);
			else
				done[j][1] = panfrost_dequeue_job(pfdev, j);
		}

		for (i = 0; i < ARRAY_SIZE(done[0]) && done[j][i]; i++)
			panfrost_job_handle_done(pfdev, done[j][i]);
	}

	/* And finally we requeue jobs that were waiting in the second slot
	 * and have been stopped if we detected a failure on the first slot.
	 */
	for (j = 0; j < NUM_JOB_SLOTS; j++) {
		if (!(js_events & MK_JS_MASK(j)))
			continue;

		if (!failed[j] || !pfdev->jobs[j][0])
			continue;

		if (pfdev->jobs[j][0]->jc == 0) {
			/* The job was cancelled, signal the fence now */
			struct panfrost_job *canceled = panfrost_dequeue_job(pfdev, j);

			dma_fence_set_error(canceled->done_fence, -ECANCELED);
			panfrost_job_handle_done(pfdev, canceled);
		} else if (!atomic_read(&pfdev->reset.pending)) {
			/* Requeue the job we removed if no reset is pending */
			job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_START);
		}
	}
}

static void panfrost_job_handle_irqs(struct panfrost_device *pfdev)
{
	u32 status = job_read(pfdev, JOB_INT_RAWSTAT);

	while (status) {
		pm_runtime_mark_last_busy(pfdev->dev);

		spin_lock(&pfdev->js->job_lock);
		panfrost_job_handle_irq(pfdev, status);
		spin_unlock(&pfdev->js->job_lock);
		status = job_read(pfdev, JOB_INT_RAWSTAT);
	}
}

static u32 panfrost_active_slots(struct panfrost_device *pfdev,
				 u32 *js_state_mask, u32 js_state)
{
	u32 rawstat;

	if (!(js_state & *js_state_mask))
		return 0;

	rawstat = job_read(pfdev, JOB_INT_RAWSTAT);
	if (rawstat) {
		unsigned int i;

		for (i = 0; i < NUM_JOB_SLOTS; i++) {
			if (rawstat & MK_JS_MASK(i))
				*js_state_mask &= ~MK_JS_MASK(i);
		}
	}

	return js_state & *js_state_mask;
}

static void
panfrost_reset(struct panfrost_device *pfdev,
	       struct drm_sched_job *bad)
{
	u32 js_state, js_state_mask = 0xffffffff;
	unsigned int i, j;
	bool cookie;
	int ret;

	if (!atomic_read(&pfdev->reset.pending))
		return;

	/* Stop the schedulers.
	 *
	 * FIXME: We temporarily get out of the dma_fence_signalling section
	 * because the cleanup path generate lockdep splats when taking locks
	 * to release job resources. We should rework the code to follow this
	 * pattern:
	 *
	 *	try_lock
	 *	if (locked)
	 *		release
	 *	else
	 *		schedule_work_to_release_later
	 */
	for (i = 0; i < NUM_JOB_SLOTS; i++)
		drm_sched_stop(&pfdev->js->queue[i].sched, bad);

	cookie = dma_fence_begin_signalling();

	if (bad)
		drm_sched_increase_karma(bad);

	/* Mask job interrupts and synchronize to make sure we won't be
	 * interrupted during our reset.
	 */
	job_write(pfdev, JOB_INT_MASK, 0);
	synchronize_irq(pfdev->js->irq);

	for (i = 0; i < NUM_JOB_SLOTS; i++) {
		/* Cancel the next job and soft-stop the running job. */
		job_write(pfdev, JS_COMMAND_NEXT(i), JS_COMMAND_NOP);
		job_write(pfdev, JS_COMMAND(i), JS_COMMAND_SOFT_STOP);
	}

	/* Wait at most 10ms for soft-stops to complete */
	ret = readl_poll_timeout(pfdev->iomem + JOB_INT_JS_STATE, js_state,
				 !panfrost_active_slots(pfdev, &js_state_mask, js_state),
				 10, 10000);

	if (ret)
		dev_err(pfdev->dev, "Soft-stop failed\n");

	/* Handle the remaining interrupts before we reset. */
	panfrost_job_handle_irqs(pfdev);

	/* Remaining interrupts have been handled, but we might still have
	 * stuck jobs. Let's make sure the PM counters stay balanced by
	 * manually calling pm_runtime_put_noidle() and
	 * panfrost_devfreq_record_idle() for each stuck job.
	 */
	spin_lock(&pfdev->js->job_lock);
	for (i = 0; i < NUM_JOB_SLOTS; i++) {
		for (j = 0; j < ARRAY_SIZE(pfdev->jobs[0]) && pfdev->jobs[i][j]; j++) {
			pm_runtime_put_noidle(pfdev->dev);
			panfrost_devfreq_record_idle(&pfdev->pfdevfreq);
		}
	}
	memset(pfdev->jobs, 0, sizeof(pfdev->jobs));
	spin_unlock(&pfdev->js->job_lock);

	/* Proceed with reset now. */
	panfrost_device_reset(pfdev);

	/* panfrost_device_reset() unmasks job interrupts, but we want to
	 * keep them masked a bit longer.
	 */
	job_write(pfdev, JOB_INT_MASK, 0);

	/* GPU has been reset, we can clear the reset pending bit. */
	atomic_set(&pfdev->reset.pending, 0);

	/* Now resubmit jobs that were previously queued but didn't have a
	 * chance to finish.
	 * FIXME: We temporarily get out of the DMA fence signalling section
	 * while resubmitting jobs because the job submission logic will
	 * allocate memory with the GFP_KERNEL flag which can trigger memory
	 * reclaim and exposes a lock ordering issue.
	 */
	dma_fence_end_signalling(cookie);
	for (i = 0; i < NUM_JOB_SLOTS; i++)
		drm_sched_resubmit_jobs(&pfdev->js->queue[i].sched);
	cookie = dma_fence_begin_signalling();

	/* Restart the schedulers */
	for (i = 0; i < NUM_JOB_SLOTS; i++)
		drm_sched_start(&pfdev->js->queue[i].sched, true);

	/* Re-enable job interrupts now that everything has been restarted. */
	job_write(pfdev, JOB_INT_MASK,
		  GENMASK(16 + NUM_JOB_SLOTS - 1, 16) |
		  GENMASK(NUM_JOB_SLOTS - 1, 0));

	dma_fence_end_signalling(cookie);
}

static enum drm_gpu_sched_stat panfrost_job_timedout(struct drm_sched_job
						     *sched_job)
{
	struct panfrost_job *job = to_panfrost_job(sched_job);
	struct panfrost_device *pfdev = job->pfdev;
	int js = panfrost_job_get_slot(job);

	/*
	 * If the GPU managed to complete this jobs fence, the timeout is
	 * spurious. Bail out.
	 */
	if (dma_fence_is_signaled(job->done_fence))
		return DRM_GPU_SCHED_STAT_NOMINAL;

	/*
	 * Panfrost IRQ handler may take a long time to process an interrupt
	 * if there is another IRQ handler hogging the processing.
	 * For example, the HDMI encoder driver might be stuck in the IRQ
	 * handler for a significant time in a case of bad cable connection.
	 * In order to catch such cases and not report spurious Panfrost
	 * job timeouts, synchronize the IRQ handler and re-check the fence
	 * status.
	 */
	synchronize_irq(pfdev->js->irq);

	if (dma_fence_is_signaled(job->done_fence)) {
		dev_warn(pfdev->dev, "unexpectedly high interrupt latency\n");
		return DRM_GPU_SCHED_STAT_NOMINAL;
	}

	dev_err(pfdev->dev, "gpu sched timeout, js=%d, config=0x%x, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p",
		js,
		job_read(pfdev, JS_CONFIG(js)),
		job_read(pfdev, JS_STATUS(js)),
		job_read(pfdev, JS_HEAD_LO(js)),
		job_read(pfdev, JS_TAIL_LO(js)),
		sched_job);

	panfrost_core_dump(job);

	atomic_set(&pfdev->reset.pending, 1);
	panfrost_reset(pfdev, sched_job);

	return DRM_GPU_SCHED_STAT_NOMINAL;
}

static void panfrost_reset_work(struct work_struct *work)
{
	struct panfrost_device *pfdev;

	pfdev = container_of(work, struct panfrost_device, reset.work);
	panfrost_reset(pfdev, NULL);
}

static const struct drm_sched_backend_ops panfrost_sched_ops = {
	.run_job = panfrost_job_run,
	.timedout_job = panfrost_job_timedout,
	.free_job = panfrost_job_free
};

static irqreturn_t panfrost_job_irq_handler_thread(int irq, void *data)
{
	struct panfrost_device *pfdev = data;

	panfrost_job_handle_irqs(pfdev);
	job_write(pfdev, JOB_INT_MASK,
		  GENMASK(16 + NUM_JOB_SLOTS - 1, 16) |
		  GENMASK(NUM_JOB_SLOTS - 1, 0));
	return IRQ_HANDLED;
}

static irqreturn_t panfrost_job_irq_handler(int irq, void *data)
{
	struct panfrost_device *pfdev = data;
	u32 status = job_read(pfdev, JOB_INT_STAT);

	if (!status)
		return IRQ_NONE;

	job_write(pfdev, JOB_INT_MASK, 0);
	return IRQ_WAKE_THREAD;
}

int panfrost_job_init(struct panfrost_device *pfdev)
{
	struct panfrost_job_slot *js;
	unsigned int nentries = 2;
	int ret, j;

	/* All GPUs have two entries per queue, but without jobchain
	 * disambiguation stopping the right job in the close path is tricky,
	 * so let's just advertise one entry in that case.
	 */
	if (!panfrost_has_hw_feature(pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION))
		nentries = 1;

	pfdev->js = js = devm_kzalloc(pfdev->dev, sizeof(*js), GFP_KERNEL);
	if (!js)
		return -ENOMEM;

	INIT_WORK(&pfdev->reset.work, panfrost_reset_work);
	spin_lock_init(&js->job_lock);

	js->irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "job");
	if (js->irq <= 0)
		return -ENODEV;

	ret = devm_request_threaded_irq(pfdev->dev, js->irq,
					panfrost_job_irq_handler,
					panfrost_job_irq_handler_thread,
					IRQF_SHARED, KBUILD_MODNAME "-job",
					pfdev);
	if (ret) {
		dev_err(pfdev->dev, "failed to request job irq");
		return ret;
	}

	pfdev->reset.wq = alloc_ordered_workqueue("panfrost-reset", 0);
	if (!pfdev->reset.wq)
		return -ENOMEM;

	for (j = 0; j < NUM_JOB_SLOTS; j++) {
		js->queue[j].fence_context = dma_fence_context_alloc(1);

		ret = drm_sched_init(&js->queue[j].sched,
				     &panfrost_sched_ops,
				     nentries, 0,
				     msecs_to_jiffies(JOB_TIMEOUT_MS),
				     pfdev->reset.wq,
				     NULL, "pan_js", pfdev->dev);
		if (ret) {
			dev_err(pfdev->dev, "Failed to create scheduler: %d.", ret);
			goto err_sched;
		}
	}

	panfrost_job_enable_interrupts(pfdev);

	return 0;

err_sched:
	for (j--; j >= 0; j--)
		drm_sched_fini(&js->queue[j].sched);

	destroy_workqueue(pfdev->reset.wq);
	return ret;
}

void panfrost_job_fini(struct panfrost_device *pfdev)
{
	struct panfrost_job_slot *js = pfdev->js;
	int j;

	job_write(pfdev, JOB_INT_MASK, 0);

	for (j = 0; j < NUM_JOB_SLOTS; j++) {
		drm_sched_fini(&js->queue[j].sched);
	}

	cancel_work_sync(&pfdev->reset.work);
	destroy_workqueue(pfdev->reset.wq);
}

int panfrost_job_open(struct panfrost_file_priv *panfrost_priv)
{
	struct panfrost_device *pfdev = panfrost_priv->pfdev;
	struct panfrost_job_slot *js = pfdev->js;
	struct drm_gpu_scheduler *sched;
	int ret, i;

	for (i = 0; i < NUM_JOB_SLOTS; i++) {
		sched = &js->queue[i].sched;
		ret = drm_sched_entity_init(&panfrost_priv->sched_entity[i],
					    DRM_SCHED_PRIORITY_NORMAL, &sched,
					    1, NULL);
		if (WARN_ON(ret))
			return ret;
	}
	return 0;
}

void panfrost_job_close(struct panfrost_file_priv *panfrost_priv)
{
	struct panfrost_device *pfdev = panfrost_priv->pfdev;
	int i;

	for (i = 0; i < NUM_JOB_SLOTS; i++)
		drm_sched_entity_destroy(&panfrost_priv->sched_entity[i]);

	/* Kill in-flight jobs */
	spin_lock(&pfdev->js->job_lock);
	for (i = 0; i < NUM_JOB_SLOTS; i++) {
		struct drm_sched_entity *entity = &panfrost_priv->sched_entity[i];
		int j;

		for (j = ARRAY_SIZE(pfdev->jobs[0]) - 1; j >= 0; j--) {
			struct panfrost_job *job = pfdev->jobs[i][j];
			u32 cmd;

			if (!job || job->base.entity != entity)
				continue;

			if (j == 1) {
				/* Try to cancel the job before it starts */
				job_write(pfdev, JS_COMMAND_NEXT(i), JS_COMMAND_NOP);
				/* Reset the job head so it doesn't get restarted if
				 * the job in the first slot failed.
				 */
				job->jc = 0;
			}

			if (panfrost_has_hw_feature(pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION)) {
				cmd = panfrost_get_job_chain_flag(job) ?
				      JS_COMMAND_HARD_STOP_1 :
				      JS_COMMAND_HARD_STOP_0;
			} else {
				cmd = JS_COMMAND_HARD_STOP;
			}

			job_write(pfdev, JS_COMMAND(i), cmd);
		}
	}
	spin_unlock(&pfdev->js->job_lock);
}

int panfrost_job_is_idle(struct panfrost_device *pfdev)
{
	struct panfrost_job_slot *js = pfdev->js;
	int i;

	for (i = 0; i < NUM_JOB_SLOTS; i++) {
		/* If there are any jobs in the HW queue, we're not idle */
		if (atomic_read(&js->queue[i].sched.hw_rq_count))
			return false;
	}

	return true;
}