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/platform_device.h>
8 #include <linux/pm_runtime.h>
9 #include <linux/dma-resv.h>
10 #include <drm/gpu_scheduler.h>
11 #include <drm/panfrost_drm.h>
12
13 #include "panfrost_device.h"
14 #include "panfrost_devfreq.h"
15 #include "panfrost_job.h"
16 #include "panfrost_features.h"
17 #include "panfrost_issues.h"
18 #include "panfrost_gem.h"
19 #include "panfrost_regs.h"
20 #include "panfrost_gpu.h"
21 #include "panfrost_mmu.h"
22
23 #define job_write(dev, reg, data) writel(data, dev->iomem + (reg))
24 #define job_read(dev, reg) readl(dev->iomem + (reg))
25
26 struct panfrost_queue_state {
27 struct drm_gpu_scheduler sched;
28
29 u64 fence_context;
30 u64 emit_seqno;
31 };
32
33 struct panfrost_job_slot {
34 struct panfrost_queue_state queue[NUM_JOB_SLOTS];
35 spinlock_t job_lock;
36 };
37
38 static struct panfrost_job *
to_panfrost_job(struct drm_sched_job * sched_job)39 to_panfrost_job(struct drm_sched_job *sched_job)
40 {
41 return container_of(sched_job, struct panfrost_job, base);
42 }
43
44 struct panfrost_fence {
45 struct dma_fence base;
46 struct drm_device *dev;
47 /* panfrost seqno for signaled() test */
48 u64 seqno;
49 int queue;
50 };
51
52 static inline struct panfrost_fence *
to_panfrost_fence(struct dma_fence * fence)53 to_panfrost_fence(struct dma_fence *fence)
54 {
55 return (struct panfrost_fence *)fence;
56 }
57
panfrost_fence_get_driver_name(struct dma_fence * fence)58 static const char *panfrost_fence_get_driver_name(struct dma_fence *fence)
59 {
60 return "panfrost";
61 }
62
panfrost_fence_get_timeline_name(struct dma_fence * fence)63 static const char *panfrost_fence_get_timeline_name(struct dma_fence *fence)
64 {
65 struct panfrost_fence *f = to_panfrost_fence(fence);
66
67 switch (f->queue) {
68 case 0:
69 return "panfrost-js-0";
70 case 1:
71 return "panfrost-js-1";
72 case 2:
73 return "panfrost-js-2";
74 default:
75 return NULL;
76 }
77 }
78
79 static const struct dma_fence_ops panfrost_fence_ops = {
80 .get_driver_name = panfrost_fence_get_driver_name,
81 .get_timeline_name = panfrost_fence_get_timeline_name,
82 };
83
panfrost_fence_create(struct panfrost_device * pfdev,int js_num)84 static struct dma_fence *panfrost_fence_create(struct panfrost_device *pfdev, int js_num)
85 {
86 struct panfrost_fence *fence;
87 struct panfrost_job_slot *js = pfdev->js;
88
89 fence = kzalloc(sizeof(*fence), GFP_KERNEL);
90 if (!fence)
91 return ERR_PTR(-ENOMEM);
92
93 fence->dev = pfdev->ddev;
94 fence->queue = js_num;
95 fence->seqno = ++js->queue[js_num].emit_seqno;
96 dma_fence_init(&fence->base, &panfrost_fence_ops, &js->job_lock,
97 js->queue[js_num].fence_context, fence->seqno);
98
99 return &fence->base;
100 }
101
panfrost_job_get_slot(struct panfrost_job * job)102 static int panfrost_job_get_slot(struct panfrost_job *job)
103 {
104 /* JS0: fragment jobs.
105 * JS1: vertex/tiler jobs
106 * JS2: compute jobs
107 */
108 if (job->requirements & PANFROST_JD_REQ_FS)
109 return 0;
110
111 /* Not exposed to userspace yet */
112 #if 0
113 if (job->requirements & PANFROST_JD_REQ_ONLY_COMPUTE) {
114 if ((job->requirements & PANFROST_JD_REQ_CORE_GRP_MASK) &&
115 (job->pfdev->features.nr_core_groups == 2))
116 return 2;
117 if (panfrost_has_hw_issue(job->pfdev, HW_ISSUE_8987))
118 return 2;
119 }
120 #endif
121 return 1;
122 }
123
panfrost_job_write_affinity(struct panfrost_device * pfdev,u32 requirements,int js)124 static void panfrost_job_write_affinity(struct panfrost_device *pfdev,
125 u32 requirements,
126 int js)
127 {
128 u64 affinity;
129
130 /*
131 * Use all cores for now.
132 * Eventually we may need to support tiler only jobs and h/w with
133 * multiple (2) coherent core groups
134 */
135 affinity = pfdev->features.shader_present;
136
137 job_write(pfdev, JS_AFFINITY_NEXT_LO(js), affinity & 0xFFFFFFFF);
138 job_write(pfdev, JS_AFFINITY_NEXT_HI(js), affinity >> 32);
139 }
140
panfrost_job_hw_submit(struct panfrost_job * job,int js)141 static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
142 {
143 struct panfrost_device *pfdev = job->pfdev;
144 u32 cfg;
145 u64 jc_head = job->jc;
146 int ret;
147
148 ret = pm_runtime_get_sync(pfdev->dev);
149 if (ret < 0)
150 return;
151
152 if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js)))) {
153 pm_runtime_put_sync_autosuspend(pfdev->dev);
154 return;
155 }
156
157 cfg = panfrost_mmu_as_get(pfdev, &job->file_priv->mmu);
158
159 panfrost_devfreq_record_transition(pfdev, js);
160
161 job_write(pfdev, JS_HEAD_NEXT_LO(js), jc_head & 0xFFFFFFFF);
162 job_write(pfdev, JS_HEAD_NEXT_HI(js), jc_head >> 32);
163
164 panfrost_job_write_affinity(pfdev, job->requirements, js);
165
166 /* start MMU, medium priority, cache clean/flush on end, clean/flush on
167 * start */
168 cfg |= JS_CONFIG_THREAD_PRI(8) |
169 JS_CONFIG_START_FLUSH_CLEAN_INVALIDATE |
170 JS_CONFIG_END_FLUSH_CLEAN_INVALIDATE;
171
172 if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION))
173 cfg |= JS_CONFIG_ENABLE_FLUSH_REDUCTION;
174
175 if (panfrost_has_hw_issue(pfdev, HW_ISSUE_10649))
176 cfg |= JS_CONFIG_START_MMU;
177
178 job_write(pfdev, JS_CONFIG_NEXT(js), cfg);
179
180 if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION))
181 job_write(pfdev, JS_FLUSH_ID_NEXT(js), job->flush_id);
182
183 /* GO ! */
184 dev_dbg(pfdev->dev, "JS: Submitting atom %p to js[%d] with head=0x%llx",
185 job, js, jc_head);
186
187 job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START);
188 }
189
panfrost_acquire_object_fences(struct drm_gem_object ** bos,int bo_count,struct dma_fence ** implicit_fences)190 static void panfrost_acquire_object_fences(struct drm_gem_object **bos,
191 int bo_count,
192 struct dma_fence **implicit_fences)
193 {
194 int i;
195
196 for (i = 0; i < bo_count; i++)
197 implicit_fences[i] = dma_resv_get_excl_rcu(bos[i]->resv);
198 }
199
panfrost_attach_object_fences(struct drm_gem_object ** bos,int bo_count,struct dma_fence * fence)200 static void panfrost_attach_object_fences(struct drm_gem_object **bos,
201 int bo_count,
202 struct dma_fence *fence)
203 {
204 int i;
205
206 for (i = 0; i < bo_count; i++)
207 dma_resv_add_excl_fence(bos[i]->resv, fence);
208 }
209
panfrost_job_push(struct panfrost_job * job)210 int panfrost_job_push(struct panfrost_job *job)
211 {
212 struct panfrost_device *pfdev = job->pfdev;
213 int slot = panfrost_job_get_slot(job);
214 struct drm_sched_entity *entity = &job->file_priv->sched_entity[slot];
215 struct ww_acquire_ctx acquire_ctx;
216 int ret = 0;
217
218 mutex_lock(&pfdev->sched_lock);
219
220 ret = drm_gem_lock_reservations(job->bos, job->bo_count,
221 &acquire_ctx);
222 if (ret) {
223 mutex_unlock(&pfdev->sched_lock);
224 return ret;
225 }
226
227 ret = drm_sched_job_init(&job->base, entity, NULL);
228 if (ret) {
229 mutex_unlock(&pfdev->sched_lock);
230 goto unlock;
231 }
232
233 job->render_done_fence = dma_fence_get(&job->base.s_fence->finished);
234
235 kref_get(&job->refcount); /* put by scheduler job completion */
236
237 panfrost_acquire_object_fences(job->bos, job->bo_count,
238 job->implicit_fences);
239
240 drm_sched_entity_push_job(&job->base, entity);
241
242 mutex_unlock(&pfdev->sched_lock);
243
244 panfrost_attach_object_fences(job->bos, job->bo_count,
245 job->render_done_fence);
246
247 unlock:
248 drm_gem_unlock_reservations(job->bos, job->bo_count, &acquire_ctx);
249
250 return ret;
251 }
252
panfrost_job_cleanup(struct kref * ref)253 static void panfrost_job_cleanup(struct kref *ref)
254 {
255 struct panfrost_job *job = container_of(ref, struct panfrost_job,
256 refcount);
257 unsigned int i;
258
259 if (job->in_fences) {
260 for (i = 0; i < job->in_fence_count; i++)
261 dma_fence_put(job->in_fences[i]);
262 kvfree(job->in_fences);
263 }
264 if (job->implicit_fences) {
265 for (i = 0; i < job->bo_count; i++)
266 dma_fence_put(job->implicit_fences[i]);
267 kvfree(job->implicit_fences);
268 }
269 dma_fence_put(job->done_fence);
270 dma_fence_put(job->render_done_fence);
271
272 if (job->bos) {
273 for (i = 0; i < job->bo_count; i++)
274 drm_gem_object_put_unlocked(job->bos[i]);
275 kvfree(job->bos);
276 }
277
278 kfree(job);
279 }
280
panfrost_job_put(struct panfrost_job * job)281 void panfrost_job_put(struct panfrost_job *job)
282 {
283 kref_put(&job->refcount, panfrost_job_cleanup);
284 }
285
panfrost_job_free(struct drm_sched_job * sched_job)286 static void panfrost_job_free(struct drm_sched_job *sched_job)
287 {
288 struct panfrost_job *job = to_panfrost_job(sched_job);
289
290 drm_sched_job_cleanup(sched_job);
291
292 panfrost_job_put(job);
293 }
294
panfrost_job_dependency(struct drm_sched_job * sched_job,struct drm_sched_entity * s_entity)295 static struct dma_fence *panfrost_job_dependency(struct drm_sched_job *sched_job,
296 struct drm_sched_entity *s_entity)
297 {
298 struct panfrost_job *job = to_panfrost_job(sched_job);
299 struct dma_fence *fence;
300 unsigned int i;
301
302 /* Explicit fences */
303 for (i = 0; i < job->in_fence_count; i++) {
304 if (job->in_fences[i]) {
305 fence = job->in_fences[i];
306 job->in_fences[i] = NULL;
307 return fence;
308 }
309 }
310
311 /* Implicit fences, max. one per BO */
312 for (i = 0; i < job->bo_count; i++) {
313 if (job->implicit_fences[i]) {
314 fence = job->implicit_fences[i];
315 job->implicit_fences[i] = NULL;
316 return fence;
317 }
318 }
319
320 return NULL;
321 }
322
panfrost_job_run(struct drm_sched_job * sched_job)323 static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
324 {
325 struct panfrost_job *job = to_panfrost_job(sched_job);
326 struct panfrost_device *pfdev = job->pfdev;
327 int slot = panfrost_job_get_slot(job);
328 struct dma_fence *fence = NULL;
329
330 if (unlikely(job->base.s_fence->finished.error))
331 return NULL;
332
333 pfdev->jobs[slot] = job;
334
335 fence = panfrost_fence_create(pfdev, slot);
336 if (IS_ERR(fence))
337 return NULL;
338
339 if (job->done_fence)
340 dma_fence_put(job->done_fence);
341 job->done_fence = dma_fence_get(fence);
342
343 panfrost_job_hw_submit(job, slot);
344
345 return fence;
346 }
347
panfrost_job_enable_interrupts(struct panfrost_device * pfdev)348 void panfrost_job_enable_interrupts(struct panfrost_device *pfdev)
349 {
350 int j;
351 u32 irq_mask = 0;
352
353 for (j = 0; j < NUM_JOB_SLOTS; j++) {
354 irq_mask |= MK_JS_MASK(j);
355 }
356
357 job_write(pfdev, JOB_INT_CLEAR, irq_mask);
358 job_write(pfdev, JOB_INT_MASK, irq_mask);
359 }
360
panfrost_job_timedout(struct drm_sched_job * sched_job)361 static void panfrost_job_timedout(struct drm_sched_job *sched_job)
362 {
363 struct panfrost_job *job = to_panfrost_job(sched_job);
364 struct panfrost_device *pfdev = job->pfdev;
365 int js = panfrost_job_get_slot(job);
366 unsigned long flags;
367 int i;
368
369 /*
370 * If the GPU managed to complete this jobs fence, the timeout is
371 * spurious. Bail out.
372 */
373 if (dma_fence_is_signaled(job->done_fence))
374 return;
375
376 dev_err(pfdev->dev, "gpu sched timeout, js=%d, config=0x%x, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p",
377 js,
378 job_read(pfdev, JS_CONFIG(js)),
379 job_read(pfdev, JS_STATUS(js)),
380 job_read(pfdev, JS_HEAD_LO(js)),
381 job_read(pfdev, JS_TAIL_LO(js)),
382 sched_job);
383
384 if (!mutex_trylock(&pfdev->reset_lock))
385 return;
386
387 for (i = 0; i < NUM_JOB_SLOTS; i++) {
388 struct drm_gpu_scheduler *sched = &pfdev->js->queue[i].sched;
389
390 drm_sched_stop(sched, sched_job);
391 if (js != i)
392 /* Ensure any timeouts on other slots have finished */
393 cancel_delayed_work_sync(&sched->work_tdr);
394 }
395
396 drm_sched_increase_karma(sched_job);
397
398 spin_lock_irqsave(&pfdev->js->job_lock, flags);
399 for (i = 0; i < NUM_JOB_SLOTS; i++) {
400 if (pfdev->jobs[i]) {
401 pm_runtime_put_noidle(pfdev->dev);
402 pfdev->jobs[i] = NULL;
403 }
404 }
405 spin_unlock_irqrestore(&pfdev->js->job_lock, flags);
406
407 /* panfrost_core_dump(pfdev); */
408
409 panfrost_devfreq_record_transition(pfdev, js);
410 panfrost_device_reset(pfdev);
411
412 for (i = 0; i < NUM_JOB_SLOTS; i++)
413 drm_sched_resubmit_jobs(&pfdev->js->queue[i].sched);
414
415 /* restart scheduler after GPU is usable again */
416 for (i = 0; i < NUM_JOB_SLOTS; i++)
417 drm_sched_start(&pfdev->js->queue[i].sched, true);
418
419 mutex_unlock(&pfdev->reset_lock);
420 }
421
422 static const struct drm_sched_backend_ops panfrost_sched_ops = {
423 .dependency = panfrost_job_dependency,
424 .run_job = panfrost_job_run,
425 .timedout_job = panfrost_job_timedout,
426 .free_job = panfrost_job_free
427 };
428
panfrost_job_irq_handler(int irq,void * data)429 static irqreturn_t panfrost_job_irq_handler(int irq, void *data)
430 {
431 struct panfrost_device *pfdev = data;
432 u32 status = job_read(pfdev, JOB_INT_STAT);
433 int j;
434
435 dev_dbg(pfdev->dev, "jobslot irq status=%x\n", status);
436
437 if (!status)
438 return IRQ_NONE;
439
440 pm_runtime_mark_last_busy(pfdev->dev);
441
442 for (j = 0; status; j++) {
443 u32 mask = MK_JS_MASK(j);
444
445 if (!(status & mask))
446 continue;
447
448 job_write(pfdev, JOB_INT_CLEAR, mask);
449
450 if (status & JOB_INT_MASK_ERR(j)) {
451 job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_NOP);
452
453 dev_err(pfdev->dev, "js fault, js=%d, status=%s, head=0x%x, tail=0x%x",
454 j,
455 panfrost_exception_name(pfdev, job_read(pfdev, JS_STATUS(j))),
456 job_read(pfdev, JS_HEAD_LO(j)),
457 job_read(pfdev, JS_TAIL_LO(j)));
458
459 drm_sched_fault(&pfdev->js->queue[j].sched);
460 }
461
462 if (status & JOB_INT_MASK_DONE(j)) {
463 struct panfrost_job *job;
464
465 spin_lock(&pfdev->js->job_lock);
466 job = pfdev->jobs[j];
467 /* Only NULL if job timeout occurred */
468 if (job) {
469 pfdev->jobs[j] = NULL;
470
471 panfrost_mmu_as_put(pfdev, &job->file_priv->mmu);
472 panfrost_devfreq_record_transition(pfdev, j);
473
474 dma_fence_signal_locked(job->done_fence);
475 pm_runtime_put_autosuspend(pfdev->dev);
476 }
477 spin_unlock(&pfdev->js->job_lock);
478 }
479
480 status &= ~mask;
481 }
482
483 return IRQ_HANDLED;
484 }
485
panfrost_job_init(struct panfrost_device * pfdev)486 int panfrost_job_init(struct panfrost_device *pfdev)
487 {
488 struct panfrost_job_slot *js;
489 int ret, j, irq;
490
491 pfdev->js = js = devm_kzalloc(pfdev->dev, sizeof(*js), GFP_KERNEL);
492 if (!js)
493 return -ENOMEM;
494
495 spin_lock_init(&js->job_lock);
496
497 irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "job");
498 if (irq <= 0)
499 return -ENODEV;
500
501 ret = devm_request_irq(pfdev->dev, irq, panfrost_job_irq_handler,
502 IRQF_SHARED, "job", pfdev);
503 if (ret) {
504 dev_err(pfdev->dev, "failed to request job irq");
505 return ret;
506 }
507
508 for (j = 0; j < NUM_JOB_SLOTS; j++) {
509 js->queue[j].fence_context = dma_fence_context_alloc(1);
510
511 ret = drm_sched_init(&js->queue[j].sched,
512 &panfrost_sched_ops,
513 1, 0, msecs_to_jiffies(500),
514 "pan_js");
515 if (ret) {
516 dev_err(pfdev->dev, "Failed to create scheduler: %d.", ret);
517 goto err_sched;
518 }
519 }
520
521 panfrost_job_enable_interrupts(pfdev);
522
523 return 0;
524
525 err_sched:
526 for (j--; j >= 0; j--)
527 drm_sched_fini(&js->queue[j].sched);
528
529 return ret;
530 }
531
panfrost_job_fini(struct panfrost_device * pfdev)532 void panfrost_job_fini(struct panfrost_device *pfdev)
533 {
534 struct panfrost_job_slot *js = pfdev->js;
535 int j;
536
537 job_write(pfdev, JOB_INT_MASK, 0);
538
539 for (j = 0; j < NUM_JOB_SLOTS; j++)
540 drm_sched_fini(&js->queue[j].sched);
541
542 }
543
panfrost_job_open(struct panfrost_file_priv * panfrost_priv)544 int panfrost_job_open(struct panfrost_file_priv *panfrost_priv)
545 {
546 struct panfrost_device *pfdev = panfrost_priv->pfdev;
547 struct panfrost_job_slot *js = pfdev->js;
548 struct drm_sched_rq *rq;
549 int ret, i;
550
551 for (i = 0; i < NUM_JOB_SLOTS; i++) {
552 rq = &js->queue[i].sched.sched_rq[DRM_SCHED_PRIORITY_NORMAL];
553 ret = drm_sched_entity_init(&panfrost_priv->sched_entity[i], &rq, 1, NULL);
554 if (WARN_ON(ret))
555 return ret;
556 }
557 return 0;
558 }
559
panfrost_job_close(struct panfrost_file_priv * panfrost_priv)560 void panfrost_job_close(struct panfrost_file_priv *panfrost_priv)
561 {
562 int i;
563
564 for (i = 0; i < NUM_JOB_SLOTS; i++)
565 drm_sched_entity_destroy(&panfrost_priv->sched_entity[i]);
566 }
567
panfrost_job_is_idle(struct panfrost_device * pfdev)568 int panfrost_job_is_idle(struct panfrost_device *pfdev)
569 {
570 struct panfrost_job_slot *js = pfdev->js;
571 int i;
572
573 for (i = 0; i < NUM_JOB_SLOTS; i++) {
574 /* If there are any jobs in the HW queue, we're not idle */
575 if (atomic_read(&js->queue[i].sched.hw_rq_count))
576 return false;
577
578 /* Check whether the hardware is idle */
579 if (pfdev->devfreq.slot[i].busy)
580 return false;
581 }
582
583 return true;
584 }
585