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