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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
3/* Copyright 2019 Collabora ltd. */
4#include <linux/delay.h>
5#include <linux/interrupt.h>
6#include <linux/io.h>
7#include <linux/iopoll.h>
8#include <linux/platform_device.h>
9#include <linux/pm_runtime.h>
10#include <linux/dma-resv.h>
11#include <drm/gpu_scheduler.h>
12#include <drm/panfrost_drm.h>
13
14#include "panfrost_device.h"
15#include "panfrost_devfreq.h"
16#include "panfrost_job.h"
17#include "panfrost_features.h"
18#include "panfrost_issues.h"
19#include "panfrost_gem.h"
20#include "panfrost_regs.h"
21#include "panfrost_gpu.h"
22#include "panfrost_mmu.h"
23#include "panfrost_dump.h"
24
25#define JOB_TIMEOUT_MS 500
26
27#define job_write(dev, reg, data) writel(data, dev->iomem + (reg))
28#define job_read(dev, reg) readl(dev->iomem + (reg))
29
30struct panfrost_queue_state {
31 struct drm_gpu_scheduler sched;
32 u64 fence_context;
33 u64 emit_seqno;
34};
35
36struct panfrost_job_slot {
37 struct panfrost_queue_state queue[NUM_JOB_SLOTS];
38 spinlock_t job_lock;
39 int irq;
40};
41
42static struct panfrost_job *
43to_panfrost_job(struct drm_sched_job *sched_job)
44{
45 return container_of(sched_job, struct panfrost_job, base);
46}
47
48struct panfrost_fence {
49 struct dma_fence base;
50 struct drm_device *dev;
51 /* panfrost seqno for signaled() test */
52 u64 seqno;
53 int queue;
54};
55
56static inline struct panfrost_fence *
57to_panfrost_fence(struct dma_fence *fence)
58{
59 return (struct panfrost_fence *)fence;
60}
61
62static const char *panfrost_fence_get_driver_name(struct dma_fence *fence)
63{
64 return "panfrost";
65}
66
67static const char *panfrost_fence_get_timeline_name(struct dma_fence *fence)
68{
69 struct panfrost_fence *f = to_panfrost_fence(fence);
70
71 switch (f->queue) {
72 case 0:
73 return "panfrost-js-0";
74 case 1:
75 return "panfrost-js-1";
76 case 2:
77 return "panfrost-js-2";
78 default:
79 return NULL;
80 }
81}
82
83static const struct dma_fence_ops panfrost_fence_ops = {
84 .get_driver_name = panfrost_fence_get_driver_name,
85 .get_timeline_name = panfrost_fence_get_timeline_name,
86};
87
88static struct dma_fence *panfrost_fence_create(struct panfrost_device *pfdev, int js_num)
89{
90 struct panfrost_fence *fence;
91 struct panfrost_job_slot *js = pfdev->js;
92
93 fence = kzalloc(sizeof(*fence), GFP_KERNEL);
94 if (!fence)
95 return ERR_PTR(-ENOMEM);
96
97 fence->dev = pfdev->ddev;
98 fence->queue = js_num;
99 fence->seqno = ++js->queue[js_num].emit_seqno;
100 dma_fence_init(&fence->base, &panfrost_fence_ops, &js->job_lock,
101 js->queue[js_num].fence_context, fence->seqno);
102
103 return &fence->base;
104}
105
106int panfrost_job_get_slot(struct panfrost_job *job)
107{
108 /* JS0: fragment jobs.
109 * JS1: vertex/tiler jobs
110 * JS2: compute jobs
111 */
112 if (job->requirements & PANFROST_JD_REQ_FS)
113 return 0;
114
115/* Not exposed to userspace yet */
116#if 0
117 if (job->requirements & PANFROST_JD_REQ_ONLY_COMPUTE) {
118 if ((job->requirements & PANFROST_JD_REQ_CORE_GRP_MASK) &&
119 (job->pfdev->features.nr_core_groups == 2))
120 return 2;
121 if (panfrost_has_hw_issue(job->pfdev, HW_ISSUE_8987))
122 return 2;
123 }
124#endif
125 return 1;
126}
127
128static void panfrost_job_write_affinity(struct panfrost_device *pfdev,
129 u32 requirements,
130 int js)
131{
132 u64 affinity;
133
134 /*
135 * Use all cores for now.
136 * Eventually we may need to support tiler only jobs and h/w with
137 * multiple (2) coherent core groups
138 */
139 affinity = pfdev->features.shader_present;
140
141 job_write(pfdev, JS_AFFINITY_NEXT_LO(js), lower_32_bits(affinity));
142 job_write(pfdev, JS_AFFINITY_NEXT_HI(js), upper_32_bits(affinity));
143}
144
145static u32
146panfrost_get_job_chain_flag(const struct panfrost_job *job)
147{
148 struct panfrost_fence *f = to_panfrost_fence(job->done_fence);
149
150 if (!panfrost_has_hw_feature(job->pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION))
151 return 0;
152
153 return (f->seqno & 1) ? JS_CONFIG_JOB_CHAIN_FLAG : 0;
154}
155
156static struct panfrost_job *
157panfrost_dequeue_job(struct panfrost_device *pfdev, int slot)
158{
159 struct panfrost_job *job = pfdev->jobs[slot][0];
160
161 WARN_ON(!job);
162
163 if (job->is_profiled && job->engine_usage) {
164 job->engine_usage->elapsed_ns[slot] +=
165 ktime_to_ns(ktime_sub(ktime_get(), job->start_time));
166 job->engine_usage->cycles[slot] +=
167 panfrost_cycle_counter_read(pfdev) - job->start_cycles;
168 }
169
170 if (job->requirements & PANFROST_JD_REQ_CYCLE_COUNT || job->is_profiled)
171 panfrost_cycle_counter_put(pfdev);
172
173 pfdev->jobs[slot][0] = pfdev->jobs[slot][1];
174 pfdev->jobs[slot][1] = NULL;
175
176 return job;
177}
178
179static unsigned int
180panfrost_enqueue_job(struct panfrost_device *pfdev, int slot,
181 struct panfrost_job *job)
182{
183 if (WARN_ON(!job))
184 return 0;
185
186 if (!pfdev->jobs[slot][0]) {
187 pfdev->jobs[slot][0] = job;
188 return 0;
189 }
190
191 WARN_ON(pfdev->jobs[slot][1]);
192 pfdev->jobs[slot][1] = job;
193 WARN_ON(panfrost_get_job_chain_flag(job) ==
194 panfrost_get_job_chain_flag(pfdev->jobs[slot][0]));
195 return 1;
196}
197
198static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
199{
200 struct panfrost_device *pfdev = job->pfdev;
201 unsigned int subslot;
202 u32 cfg;
203 u64 jc_head = job->jc;
204 int ret;
205
206 panfrost_devfreq_record_busy(&pfdev->pfdevfreq);
207
208 ret = pm_runtime_get_sync(pfdev->dev);
209 if (ret < 0)
210 return;
211
212 if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js)))) {
213 return;
214 }
215
216 cfg = panfrost_mmu_as_get(pfdev, job->mmu);
217
218 job_write(pfdev, JS_HEAD_NEXT_LO(js), lower_32_bits(jc_head));
219 job_write(pfdev, JS_HEAD_NEXT_HI(js), upper_32_bits(jc_head));
220
221 panfrost_job_write_affinity(pfdev, job->requirements, js);
222
223 /* start MMU, medium priority, cache clean/flush on end, clean/flush on
224 * start */
225 cfg |= JS_CONFIG_THREAD_PRI(8) |
226 JS_CONFIG_START_FLUSH_CLEAN_INVALIDATE |
227 JS_CONFIG_END_FLUSH_CLEAN_INVALIDATE |
228 panfrost_get_job_chain_flag(job);
229
230 if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION))
231 cfg |= JS_CONFIG_ENABLE_FLUSH_REDUCTION;
232
233 if (panfrost_has_hw_issue(pfdev, HW_ISSUE_10649))
234 cfg |= JS_CONFIG_START_MMU;
235
236 job_write(pfdev, JS_CONFIG_NEXT(js), cfg);
237
238 if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION))
239 job_write(pfdev, JS_FLUSH_ID_NEXT(js), job->flush_id);
240
241 /* GO ! */
242
243 spin_lock(&pfdev->js->job_lock);
244 subslot = panfrost_enqueue_job(pfdev, js, job);
245 /* Don't queue the job if a reset is in progress */
246 if (!atomic_read(&pfdev->reset.pending)) {
247 job->is_profiled = pfdev->profile_mode;
248
249 if (job->requirements & PANFROST_JD_REQ_CYCLE_COUNT ||
250 job->is_profiled)
251 panfrost_cycle_counter_get(pfdev);
252
253 if (job->is_profiled) {
254 job->start_time = ktime_get();
255 job->start_cycles = panfrost_cycle_counter_read(pfdev);
256 }
257
258 job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START);
259 dev_dbg(pfdev->dev,
260 "JS: Submitting atom %p to js[%d][%d] with head=0x%llx AS %d",
261 job, js, subslot, jc_head, cfg & 0xf);
262 }
263 spin_unlock(&pfdev->js->job_lock);
264}
265
266static int panfrost_acquire_object_fences(struct drm_gem_object **bos,
267 int bo_count,
268 struct drm_sched_job *job)
269{
270 int i, ret;
271
272 for (i = 0; i < bo_count; i++) {
273 ret = dma_resv_reserve_fences(bos[i]->resv, 1);
274 if (ret)
275 return ret;
276
277 /* panfrost always uses write mode in its current uapi */
278 ret = drm_sched_job_add_implicit_dependencies(job, bos[i],
279 true);
280 if (ret)
281 return ret;
282 }
283
284 return 0;
285}
286
287static void panfrost_attach_object_fences(struct drm_gem_object **bos,
288 int bo_count,
289 struct dma_fence *fence)
290{
291 int i;
292
293 for (i = 0; i < bo_count; i++)
294 dma_resv_add_fence(bos[i]->resv, fence, DMA_RESV_USAGE_WRITE);
295}
296
297int panfrost_job_push(struct panfrost_job *job)
298{
299 struct panfrost_device *pfdev = job->pfdev;
300 struct ww_acquire_ctx acquire_ctx;
301 int ret = 0;
302
303 ret = drm_gem_lock_reservations(job->bos, job->bo_count,
304 &acquire_ctx);
305 if (ret)
306 return ret;
307
308 mutex_lock(&pfdev->sched_lock);
309 drm_sched_job_arm(&job->base);
310
311 job->render_done_fence = dma_fence_get(&job->base.s_fence->finished);
312
313 ret = panfrost_acquire_object_fences(job->bos, job->bo_count,
314 &job->base);
315 if (ret) {
316 mutex_unlock(&pfdev->sched_lock);
317 goto unlock;
318 }
319
320 kref_get(&job->refcount); /* put by scheduler job completion */
321
322 drm_sched_entity_push_job(&job->base);
323
324 mutex_unlock(&pfdev->sched_lock);
325
326 panfrost_attach_object_fences(job->bos, job->bo_count,
327 job->render_done_fence);
328
329unlock:
330 drm_gem_unlock_reservations(job->bos, job->bo_count, &acquire_ctx);
331
332 return ret;
333}
334
335static void panfrost_job_cleanup(struct kref *ref)
336{
337 struct panfrost_job *job = container_of(ref, struct panfrost_job,
338 refcount);
339 unsigned int i;
340
341 dma_fence_put(job->done_fence);
342 dma_fence_put(job->render_done_fence);
343
344 if (job->mappings) {
345 for (i = 0; i < job->bo_count; i++) {
346 if (!job->mappings[i])
347 break;
348
349 atomic_dec(&job->mappings[i]->obj->gpu_usecount);
350 panfrost_gem_mapping_put(job->mappings[i]);
351 }
352 kvfree(job->mappings);
353 }
354
355 if (job->bos) {
356 for (i = 0; i < job->bo_count; i++)
357 drm_gem_object_put(job->bos[i]);
358
359 kvfree(job->bos);
360 }
361
362 kfree(job);
363}
364
365void panfrost_job_put(struct panfrost_job *job)
366{
367 kref_put(&job->refcount, panfrost_job_cleanup);
368}
369
370static void panfrost_job_free(struct drm_sched_job *sched_job)
371{
372 struct panfrost_job *job = to_panfrost_job(sched_job);
373
374 drm_sched_job_cleanup(sched_job);
375
376 panfrost_job_put(job);
377}
378
379static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
380{
381 struct panfrost_job *job = to_panfrost_job(sched_job);
382 struct panfrost_device *pfdev = job->pfdev;
383 int slot = panfrost_job_get_slot(job);
384 struct dma_fence *fence = NULL;
385
386 if (unlikely(job->base.s_fence->finished.error))
387 return NULL;
388
389 /* Nothing to execute: can happen if the job has finished while
390 * we were resetting the GPU.
391 */
392 if (!job->jc)
393 return NULL;
394
395 fence = panfrost_fence_create(pfdev, slot);
396 if (IS_ERR(fence))
397 return fence;
398
399 if (job->done_fence)
400 dma_fence_put(job->done_fence);
401 job->done_fence = dma_fence_get(fence);
402
403 panfrost_job_hw_submit(job, slot);
404
405 return fence;
406}
407
408void panfrost_job_enable_interrupts(struct panfrost_device *pfdev)
409{
410 int j;
411 u32 irq_mask = 0;
412
413 clear_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended);
414
415 for (j = 0; j < NUM_JOB_SLOTS; j++) {
416 irq_mask |= MK_JS_MASK(j);
417 }
418
419 job_write(pfdev, JOB_INT_CLEAR, irq_mask);
420 job_write(pfdev, JOB_INT_MASK, irq_mask);
421}
422
423void panfrost_job_suspend_irq(struct panfrost_device *pfdev)
424{
425 set_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended);
426
427 job_write(pfdev, JOB_INT_MASK, 0);
428 synchronize_irq(pfdev->js->irq);
429}
430
431static void panfrost_job_handle_err(struct panfrost_device *pfdev,
432 struct panfrost_job *job,
433 unsigned int js)
434{
435 u32 js_status = job_read(pfdev, JS_STATUS(js));
436 const char *exception_name = panfrost_exception_name(js_status);
437 bool signal_fence = true;
438
439 if (!panfrost_exception_is_fault(js_status)) {
440 dev_dbg(pfdev->dev, "js event, js=%d, status=%s, head=0x%x, tail=0x%x",
441 js, exception_name,
442 job_read(pfdev, JS_HEAD_LO(js)),
443 job_read(pfdev, JS_TAIL_LO(js)));
444 } else {
445 dev_err(pfdev->dev, "js fault, js=%d, status=%s, head=0x%x, tail=0x%x",
446 js, exception_name,
447 job_read(pfdev, JS_HEAD_LO(js)),
448 job_read(pfdev, JS_TAIL_LO(js)));
449 }
450
451 if (js_status == DRM_PANFROST_EXCEPTION_STOPPED) {
452 /* Update the job head so we can resume */
453 job->jc = job_read(pfdev, JS_TAIL_LO(js)) |
454 ((u64)job_read(pfdev, JS_TAIL_HI(js)) << 32);
455
456 /* The job will be resumed, don't signal the fence */
457 signal_fence = false;
458 } else if (js_status == DRM_PANFROST_EXCEPTION_TERMINATED) {
459 /* Job has been hard-stopped, flag it as canceled */
460 dma_fence_set_error(job->done_fence, -ECANCELED);
461 job->jc = 0;
462 } else if (panfrost_exception_is_fault(js_status)) {
463 /* We might want to provide finer-grained error code based on
464 * the exception type, but unconditionally setting to EINVAL
465 * is good enough for now.
466 */
467 dma_fence_set_error(job->done_fence, -EINVAL);
468 job->jc = 0;
469 }
470
471 panfrost_mmu_as_put(pfdev, job->mmu);
472 panfrost_devfreq_record_idle(&pfdev->pfdevfreq);
473
474 if (signal_fence)
475 dma_fence_signal_locked(job->done_fence);
476
477 pm_runtime_put_autosuspend(pfdev->dev);
478
479 if (panfrost_exception_needs_reset(pfdev, js_status)) {
480 atomic_set(&pfdev->reset.pending, 1);
481 drm_sched_fault(&pfdev->js->queue[js].sched);
482 }
483}
484
485static void panfrost_job_handle_done(struct panfrost_device *pfdev,
486 struct panfrost_job *job)
487{
488 /* Set ->jc to 0 to avoid re-submitting an already finished job (can
489 * happen when we receive the DONE interrupt while doing a GPU reset).
490 */
491 job->jc = 0;
492 panfrost_mmu_as_put(pfdev, job->mmu);
493 panfrost_devfreq_record_idle(&pfdev->pfdevfreq);
494
495 dma_fence_signal_locked(job->done_fence);
496 pm_runtime_put_autosuspend(pfdev->dev);
497}
498
499static void panfrost_job_handle_irq(struct panfrost_device *pfdev, u32 status)
500{
501 struct panfrost_job *done[NUM_JOB_SLOTS][2] = {};
502 struct panfrost_job *failed[NUM_JOB_SLOTS] = {};
503 u32 js_state = 0, js_events = 0;
504 unsigned int i, j;
505
506 /* First we collect all failed/done jobs. */
507 while (status) {
508 u32 js_state_mask = 0;
509
510 for (j = 0; j < NUM_JOB_SLOTS; j++) {
511 if (status & MK_JS_MASK(j))
512 js_state_mask |= MK_JS_MASK(j);
513
514 if (status & JOB_INT_MASK_DONE(j)) {
515 if (done[j][0])
516 done[j][1] = panfrost_dequeue_job(pfdev, j);
517 else
518 done[j][0] = panfrost_dequeue_job(pfdev, j);
519 }
520
521 if (status & JOB_INT_MASK_ERR(j)) {
522 /* Cancel the next submission. Will be submitted
523 * after we're done handling this failure if
524 * there's no reset pending.
525 */
526 job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_NOP);
527 failed[j] = panfrost_dequeue_job(pfdev, j);
528 }
529 }
530
531 /* JS_STATE is sampled when JOB_INT_CLEAR is written.
532 * For each BIT(slot) or BIT(slot + 16) bit written to
533 * JOB_INT_CLEAR, the corresponding bits in JS_STATE
534 * (BIT(slot) and BIT(slot + 16)) are updated, but this
535 * is racy. If we only have one job done at the time we
536 * read JOB_INT_RAWSTAT but the second job fails before we
537 * clear the status, we end up with a status containing
538 * only the DONE bit and consider both jobs as DONE since
539 * JS_STATE reports both NEXT and CURRENT as inactive.
540 * To prevent that, let's repeat this clear+read steps
541 * until status is 0.
542 */
543 job_write(pfdev, JOB_INT_CLEAR, status);
544 js_state &= ~js_state_mask;
545 js_state |= job_read(pfdev, JOB_INT_JS_STATE) & js_state_mask;
546 js_events |= status;
547 status = job_read(pfdev, JOB_INT_RAWSTAT);
548 }
549
550 /* Then we handle the dequeued jobs. */
551 for (j = 0; j < NUM_JOB_SLOTS; j++) {
552 if (!(js_events & MK_JS_MASK(j)))
553 continue;
554
555 if (failed[j]) {
556 panfrost_job_handle_err(pfdev, failed[j], j);
557 } else if (pfdev->jobs[j][0] && !(js_state & MK_JS_MASK(j))) {
558 /* When the current job doesn't fail, the JM dequeues
559 * the next job without waiting for an ACK, this means
560 * we can have 2 jobs dequeued and only catch the
561 * interrupt when the second one is done. If both slots
562 * are inactive, but one job remains in pfdev->jobs[j],
563 * consider it done. Of course that doesn't apply if a
564 * failure happened since we cancelled execution of the
565 * job in _NEXT (see above).
566 */
567 if (WARN_ON(!done[j][0]))
568 done[j][0] = panfrost_dequeue_job(pfdev, j);
569 else
570 done[j][1] = panfrost_dequeue_job(pfdev, j);
571 }
572
573 for (i = 0; i < ARRAY_SIZE(done[0]) && done[j][i]; i++)
574 panfrost_job_handle_done(pfdev, done[j][i]);
575 }
576
577 /* And finally we requeue jobs that were waiting in the second slot
578 * and have been stopped if we detected a failure on the first slot.
579 */
580 for (j = 0; j < NUM_JOB_SLOTS; j++) {
581 if (!(js_events & MK_JS_MASK(j)))
582 continue;
583
584 if (!failed[j] || !pfdev->jobs[j][0])
585 continue;
586
587 if (pfdev->jobs[j][0]->jc == 0) {
588 /* The job was cancelled, signal the fence now */
589 struct panfrost_job *canceled = panfrost_dequeue_job(pfdev, j);
590
591 dma_fence_set_error(canceled->done_fence, -ECANCELED);
592 panfrost_job_handle_done(pfdev, canceled);
593 } else if (!atomic_read(&pfdev->reset.pending)) {
594 /* Requeue the job we removed if no reset is pending */
595 job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_START);
596 }
597 }
598}
599
600static void panfrost_job_handle_irqs(struct panfrost_device *pfdev)
601{
602 u32 status = job_read(pfdev, JOB_INT_RAWSTAT);
603
604 while (status) {
605 pm_runtime_mark_last_busy(pfdev->dev);
606
607 spin_lock(&pfdev->js->job_lock);
608 panfrost_job_handle_irq(pfdev, status);
609 spin_unlock(&pfdev->js->job_lock);
610 status = job_read(pfdev, JOB_INT_RAWSTAT);
611 }
612}
613
614static u32 panfrost_active_slots(struct panfrost_device *pfdev,
615 u32 *js_state_mask, u32 js_state)
616{
617 u32 rawstat;
618
619 if (!(js_state & *js_state_mask))
620 return 0;
621
622 rawstat = job_read(pfdev, JOB_INT_RAWSTAT);
623 if (rawstat) {
624 unsigned int i;
625
626 for (i = 0; i < NUM_JOB_SLOTS; i++) {
627 if (rawstat & MK_JS_MASK(i))
628 *js_state_mask &= ~MK_JS_MASK(i);
629 }
630 }
631
632 return js_state & *js_state_mask;
633}
634
635static void
636panfrost_reset(struct panfrost_device *pfdev,
637 struct drm_sched_job *bad)
638{
639 u32 js_state, js_state_mask = 0xffffffff;
640 unsigned int i, j;
641 bool cookie;
642 int ret;
643
644 if (!atomic_read(&pfdev->reset.pending))
645 return;
646
647 /* Stop the schedulers.
648 *
649 * FIXME: We temporarily get out of the dma_fence_signalling section
650 * because the cleanup path generate lockdep splats when taking locks
651 * to release job resources. We should rework the code to follow this
652 * pattern:
653 *
654 * try_lock
655 * if (locked)
656 * release
657 * else
658 * schedule_work_to_release_later
659 */
660 for (i = 0; i < NUM_JOB_SLOTS; i++)
661 drm_sched_stop(&pfdev->js->queue[i].sched, bad);
662
663 cookie = dma_fence_begin_signalling();
664
665 if (bad)
666 drm_sched_increase_karma(bad);
667
668 /* Mask job interrupts and synchronize to make sure we won't be
669 * interrupted during our reset.
670 */
671 job_write(pfdev, JOB_INT_MASK, 0);
672 synchronize_irq(pfdev->js->irq);
673
674 for (i = 0; i < NUM_JOB_SLOTS; i++) {
675 /* Cancel the next job and soft-stop the running job. */
676 job_write(pfdev, JS_COMMAND_NEXT(i), JS_COMMAND_NOP);
677 job_write(pfdev, JS_COMMAND(i), JS_COMMAND_SOFT_STOP);
678 }
679
680 /* Wait at most 10ms for soft-stops to complete */
681 ret = readl_poll_timeout(pfdev->iomem + JOB_INT_JS_STATE, js_state,
682 !panfrost_active_slots(pfdev, &js_state_mask, js_state),
683 10, 10000);
684
685 if (ret)
686 dev_err(pfdev->dev, "Soft-stop failed\n");
687
688 /* Handle the remaining interrupts before we reset. */
689 panfrost_job_handle_irqs(pfdev);
690
691 /* Remaining interrupts have been handled, but we might still have
692 * stuck jobs. Let's make sure the PM counters stay balanced by
693 * manually calling pm_runtime_put_noidle() and
694 * panfrost_devfreq_record_idle() for each stuck job.
695 * Let's also make sure the cycle counting register's refcnt is
696 * kept balanced to prevent it from running forever
697 */
698 spin_lock(&pfdev->js->job_lock);
699 for (i = 0; i < NUM_JOB_SLOTS; i++) {
700 for (j = 0; j < ARRAY_SIZE(pfdev->jobs[0]) && pfdev->jobs[i][j]; j++) {
701 if (pfdev->jobs[i][j]->requirements & PANFROST_JD_REQ_CYCLE_COUNT ||
702 pfdev->jobs[i][j]->is_profiled)
703 panfrost_cycle_counter_put(pfdev->jobs[i][j]->pfdev);
704 pm_runtime_put_noidle(pfdev->dev);
705 panfrost_devfreq_record_idle(&pfdev->pfdevfreq);
706 }
707 }
708 memset(pfdev->jobs, 0, sizeof(pfdev->jobs));
709 spin_unlock(&pfdev->js->job_lock);
710
711 /* Proceed with reset now. */
712 panfrost_device_reset(pfdev);
713
714 /* panfrost_device_reset() unmasks job interrupts, but we want to
715 * keep them masked a bit longer.
716 */
717 job_write(pfdev, JOB_INT_MASK, 0);
718
719 /* GPU has been reset, we can clear the reset pending bit. */
720 atomic_set(&pfdev->reset.pending, 0);
721
722 /* Now resubmit jobs that were previously queued but didn't have a
723 * chance to finish.
724 * FIXME: We temporarily get out of the DMA fence signalling section
725 * while resubmitting jobs because the job submission logic will
726 * allocate memory with the GFP_KERNEL flag which can trigger memory
727 * reclaim and exposes a lock ordering issue.
728 */
729 dma_fence_end_signalling(cookie);
730 for (i = 0; i < NUM_JOB_SLOTS; i++)
731 drm_sched_resubmit_jobs(&pfdev->js->queue[i].sched);
732 cookie = dma_fence_begin_signalling();
733
734 /* Restart the schedulers */
735 for (i = 0; i < NUM_JOB_SLOTS; i++)
736 drm_sched_start(&pfdev->js->queue[i].sched, 0);
737
738 /* Re-enable job interrupts now that everything has been restarted. */
739 job_write(pfdev, JOB_INT_MASK,
740 GENMASK(16 + NUM_JOB_SLOTS - 1, 16) |
741 GENMASK(NUM_JOB_SLOTS - 1, 0));
742
743 dma_fence_end_signalling(cookie);
744}
745
746static enum drm_gpu_sched_stat panfrost_job_timedout(struct drm_sched_job
747 *sched_job)
748{
749 struct panfrost_job *job = to_panfrost_job(sched_job);
750 struct panfrost_device *pfdev = job->pfdev;
751 int js = panfrost_job_get_slot(job);
752
753 /*
754 * If the GPU managed to complete this jobs fence, the timeout is
755 * spurious. Bail out.
756 */
757 if (dma_fence_is_signaled(job->done_fence))
758 return DRM_GPU_SCHED_STAT_NOMINAL;
759
760 /*
761 * Panfrost IRQ handler may take a long time to process an interrupt
762 * if there is another IRQ handler hogging the processing.
763 * For example, the HDMI encoder driver might be stuck in the IRQ
764 * handler for a significant time in a case of bad cable connection.
765 * In order to catch such cases and not report spurious Panfrost
766 * job timeouts, synchronize the IRQ handler and re-check the fence
767 * status.
768 */
769 synchronize_irq(pfdev->js->irq);
770
771 if (dma_fence_is_signaled(job->done_fence)) {
772 dev_warn(pfdev->dev, "unexpectedly high interrupt latency\n");
773 return DRM_GPU_SCHED_STAT_NOMINAL;
774 }
775
776 dev_err(pfdev->dev, "gpu sched timeout, js=%d, config=0x%x, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p",
777 js,
778 job_read(pfdev, JS_CONFIG(js)),
779 job_read(pfdev, JS_STATUS(js)),
780 job_read(pfdev, JS_HEAD_LO(js)),
781 job_read(pfdev, JS_TAIL_LO(js)),
782 sched_job);
783
784 panfrost_core_dump(job);
785
786 atomic_set(&pfdev->reset.pending, 1);
787 panfrost_reset(pfdev, sched_job);
788
789 return DRM_GPU_SCHED_STAT_NOMINAL;
790}
791
792static void panfrost_reset_work(struct work_struct *work)
793{
794 struct panfrost_device *pfdev;
795
796 pfdev = container_of(work, struct panfrost_device, reset.work);
797 panfrost_reset(pfdev, NULL);
798}
799
800static const struct drm_sched_backend_ops panfrost_sched_ops = {
801 .run_job = panfrost_job_run,
802 .timedout_job = panfrost_job_timedout,
803 .free_job = panfrost_job_free
804};
805
806static irqreturn_t panfrost_job_irq_handler_thread(int irq, void *data)
807{
808 struct panfrost_device *pfdev = data;
809
810 panfrost_job_handle_irqs(pfdev);
811
812 /* Enable interrupts only if we're not about to get suspended */
813 if (!test_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended))
814 job_write(pfdev, JOB_INT_MASK,
815 GENMASK(16 + NUM_JOB_SLOTS - 1, 16) |
816 GENMASK(NUM_JOB_SLOTS - 1, 0));
817
818 return IRQ_HANDLED;
819}
820
821static irqreturn_t panfrost_job_irq_handler(int irq, void *data)
822{
823 struct panfrost_device *pfdev = data;
824 u32 status;
825
826 if (test_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended))
827 return IRQ_NONE;
828
829 status = job_read(pfdev, JOB_INT_STAT);
830 if (!status)
831 return IRQ_NONE;
832
833 job_write(pfdev, JOB_INT_MASK, 0);
834 return IRQ_WAKE_THREAD;
835}
836
837int panfrost_job_init(struct panfrost_device *pfdev)
838{
839 struct panfrost_job_slot *js;
840 unsigned int nentries = 2;
841 int ret, j;
842
843 /* All GPUs have two entries per queue, but without jobchain
844 * disambiguation stopping the right job in the close path is tricky,
845 * so let's just advertise one entry in that case.
846 */
847 if (!panfrost_has_hw_feature(pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION))
848 nentries = 1;
849
850 pfdev->js = js = devm_kzalloc(pfdev->dev, sizeof(*js), GFP_KERNEL);
851 if (!js)
852 return -ENOMEM;
853
854 INIT_WORK(&pfdev->reset.work, panfrost_reset_work);
855 spin_lock_init(&js->job_lock);
856
857 js->irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "job");
858 if (js->irq < 0)
859 return js->irq;
860
861 ret = devm_request_threaded_irq(pfdev->dev, js->irq,
862 panfrost_job_irq_handler,
863 panfrost_job_irq_handler_thread,
864 IRQF_SHARED, KBUILD_MODNAME "-job",
865 pfdev);
866 if (ret) {
867 dev_err(pfdev->dev, "failed to request job irq");
868 return ret;
869 }
870
871 pfdev->reset.wq = alloc_ordered_workqueue("panfrost-reset", 0);
872 if (!pfdev->reset.wq)
873 return -ENOMEM;
874
875 for (j = 0; j < NUM_JOB_SLOTS; j++) {
876 js->queue[j].fence_context = dma_fence_context_alloc(1);
877
878 ret = drm_sched_init(&js->queue[j].sched,
879 &panfrost_sched_ops, NULL,
880 DRM_SCHED_PRIORITY_COUNT,
881 nentries, 0,
882 msecs_to_jiffies(JOB_TIMEOUT_MS),
883 pfdev->reset.wq,
884 NULL, "pan_js", pfdev->dev);
885 if (ret) {
886 dev_err(pfdev->dev, "Failed to create scheduler: %d.", ret);
887 goto err_sched;
888 }
889 }
890
891 panfrost_job_enable_interrupts(pfdev);
892
893 return 0;
894
895err_sched:
896 for (j--; j >= 0; j--)
897 drm_sched_fini(&js->queue[j].sched);
898
899 destroy_workqueue(pfdev->reset.wq);
900 return ret;
901}
902
903void panfrost_job_fini(struct panfrost_device *pfdev)
904{
905 struct panfrost_job_slot *js = pfdev->js;
906 int j;
907
908 job_write(pfdev, JOB_INT_MASK, 0);
909
910 for (j = 0; j < NUM_JOB_SLOTS; j++) {
911 drm_sched_fini(&js->queue[j].sched);
912 }
913
914 cancel_work_sync(&pfdev->reset.work);
915 destroy_workqueue(pfdev->reset.wq);
916}
917
918int panfrost_job_open(struct panfrost_file_priv *panfrost_priv)
919{
920 struct panfrost_device *pfdev = panfrost_priv->pfdev;
921 struct panfrost_job_slot *js = pfdev->js;
922 struct drm_gpu_scheduler *sched;
923 int ret, i;
924
925 for (i = 0; i < NUM_JOB_SLOTS; i++) {
926 sched = &js->queue[i].sched;
927 ret = drm_sched_entity_init(&panfrost_priv->sched_entity[i],
928 DRM_SCHED_PRIORITY_NORMAL, &sched,
929 1, NULL);
930 if (WARN_ON(ret))
931 return ret;
932 }
933 return 0;
934}
935
936void panfrost_job_close(struct panfrost_file_priv *panfrost_priv)
937{
938 struct panfrost_device *pfdev = panfrost_priv->pfdev;
939 int i;
940
941 for (i = 0; i < NUM_JOB_SLOTS; i++)
942 drm_sched_entity_destroy(&panfrost_priv->sched_entity[i]);
943
944 /* Kill in-flight jobs */
945 spin_lock(&pfdev->js->job_lock);
946 for (i = 0; i < NUM_JOB_SLOTS; i++) {
947 struct drm_sched_entity *entity = &panfrost_priv->sched_entity[i];
948 int j;
949
950 for (j = ARRAY_SIZE(pfdev->jobs[0]) - 1; j >= 0; j--) {
951 struct panfrost_job *job = pfdev->jobs[i][j];
952 u32 cmd;
953
954 if (!job || job->base.entity != entity)
955 continue;
956
957 if (j == 1) {
958 /* Try to cancel the job before it starts */
959 job_write(pfdev, JS_COMMAND_NEXT(i), JS_COMMAND_NOP);
960 /* Reset the job head so it doesn't get restarted if
961 * the job in the first slot failed.
962 */
963 job->jc = 0;
964 }
965
966 if (panfrost_has_hw_feature(pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION)) {
967 cmd = panfrost_get_job_chain_flag(job) ?
968 JS_COMMAND_HARD_STOP_1 :
969 JS_COMMAND_HARD_STOP_0;
970 } else {
971 cmd = JS_COMMAND_HARD_STOP;
972 }
973
974 job_write(pfdev, JS_COMMAND(i), cmd);
975
976 /* Jobs can outlive their file context */
977 job->engine_usage = NULL;
978 }
979 }
980 spin_unlock(&pfdev->js->job_lock);
981}
982
983int panfrost_job_is_idle(struct panfrost_device *pfdev)
984{
985 struct panfrost_job_slot *js = pfdev->js;
986 int i;
987
988 for (i = 0; i < NUM_JOB_SLOTS; i++) {
989 /* If there are any jobs in the HW queue, we're not idle */
990 if (atomic_read(&js->queue[i].sched.credit_count))
991 return false;
992 }
993
994 return true;
995}