drivers/gpu/drm/panfrost/panfrost_job.c

   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/reservation.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 *
  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 *
  53 to_panfrost_fence(struct dma_fence *fence)
  54 {
  55         return (struct panfrost_fence *)fence;
  56 }
  57
  58 static const char *panfrost_fence_get_driver_name(struct dma_fence *fence)
  59 {
  60         return "panfrost";
  61 }
  62
  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
  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
 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
 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
 141 static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
 142 {
 143         struct panfrost_device *pfdev = job->pfdev;
 144         unsigned long flags;
 145         u32 cfg;
 146         u64 jc_head = job->jc;
 147         int ret;
 148
 149         ret = pm_runtime_get_sync(pfdev->dev);
 150         if (ret < 0)
 151                 return;
 152
 153         if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js))))
 154                 goto end;
 155
 156         panfrost_devfreq_record_transition(pfdev, js);
 157         spin_lock_irqsave(&pfdev->hwaccess_lock, flags);
 158
 159         job_write(pfdev, JS_HEAD_NEXT_LO(js), jc_head & 0xFFFFFFFF);
 160         job_write(pfdev, JS_HEAD_NEXT_HI(js), jc_head >> 32);
 161
 162         panfrost_job_write_affinity(pfdev, job->requirements, js);
 163
 164         /* start MMU, medium priority, cache clean/flush on end, clean/flush on
 165          * start */
 166         /* TODO: different address spaces */
 167         cfg = JS_CONFIG_THREAD_PRI(8) |
 168                 JS_CONFIG_START_FLUSH_CLEAN_INVALIDATE |
 169                 JS_CONFIG_END_FLUSH_CLEAN_INVALIDATE;
 170
 171         if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION))
 172                 cfg |= JS_CONFIG_ENABLE_FLUSH_REDUCTION;
 173
 174         if (panfrost_has_hw_issue(pfdev, HW_ISSUE_10649))
 175                 cfg |= JS_CONFIG_START_MMU;
 176
 177         job_write(pfdev, JS_CONFIG_NEXT(js), cfg);
 178
 179         if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION))
 180                 job_write(pfdev, JS_FLUSH_ID_NEXT(js), job->flush_id);
 181
 182         /* GO ! */
 183         dev_dbg(pfdev->dev, "JS: Submitting atom %p to js[%d] with head=0x%llx",
 184                                 job, js, jc_head);
 185
 186         job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START);
 187
 188         spin_unlock_irqrestore(&pfdev->hwaccess_lock, flags);
 189
 190 end:
 191         pm_runtime_mark_last_busy(pfdev->dev);
 192         pm_runtime_put_autosuspend(pfdev->dev);
 193 }
 194
 195 static void panfrost_acquire_object_fences(struct drm_gem_object **bos,
 196                                            int bo_count,
 197                                            struct dma_fence **implicit_fences)
 198 {
 199         int i;
 200
 201         for (i = 0; i < bo_count; i++)
 202                 implicit_fences[i] = reservation_object_get_excl_rcu(bos[i]->resv);
 203 }
 204
 205 static void panfrost_attach_object_fences(struct drm_gem_object **bos,
 206                                           int bo_count,
 207                                           struct dma_fence *fence)
 208 {
 209         int i;
 210
 211         for (i = 0; i < bo_count; i++)
 212                 reservation_object_add_excl_fence(bos[i]->resv, fence);
 213 }
 214
 215 int panfrost_job_push(struct panfrost_job *job)
 216 {
 217         struct panfrost_device *pfdev = job->pfdev;
 218         int slot = panfrost_job_get_slot(job);
 219         struct drm_sched_entity *entity = &job->file_priv->sched_entity[slot];
 220         struct ww_acquire_ctx acquire_ctx;
 221         int ret = 0;
 222
 223         mutex_lock(&pfdev->sched_lock);
 224
 225         ret = drm_gem_lock_reservations(job->bos, job->bo_count,
 226                                             &acquire_ctx);
 227         if (ret) {
 228                 mutex_unlock(&pfdev->sched_lock);
 229                 return ret;
 230         }
 231
 232         ret = drm_sched_job_init(&job->base, entity, NULL);
 233         if (ret) {
 234                 mutex_unlock(&pfdev->sched_lock);
 235                 goto unlock;
 236         }
 237
 238         job->render_done_fence = dma_fence_get(&job->base.s_fence->finished);
 239
 240         kref_get(&job->refcount); /* put by scheduler job completion */
 241
 242         panfrost_acquire_object_fences(job->bos, job->bo_count,
 243                                        job->implicit_fences);
 244
 245         drm_sched_entity_push_job(&job->base, entity);
 246
 247         mutex_unlock(&pfdev->sched_lock);
 248
 249         panfrost_attach_object_fences(job->bos, job->bo_count,
 250                                       job->render_done_fence);
 251
 252 unlock:
 253         drm_gem_unlock_reservations(job->bos, job->bo_count, &acquire_ctx);
 254
 255         return ret;
 256 }
 257
 258 static void panfrost_job_cleanup(struct kref *ref)
 259 {
 260         struct panfrost_job *job = container_of(ref, struct panfrost_job,
 261                                                 refcount);
 262         unsigned int i;
 263
 264         if (job->in_fences) {
 265                 for (i = 0; i < job->in_fence_count; i++)
 266                         dma_fence_put(job->in_fences[i]);
 267                 kvfree(job->in_fences);
 268         }
 269         if (job->implicit_fences) {
 270                 for (i = 0; i < job->bo_count; i++)
 271                         dma_fence_put(job->implicit_fences[i]);
 272                 kvfree(job->implicit_fences);
 273         }
 274         dma_fence_put(job->done_fence);
 275         dma_fence_put(job->render_done_fence);
 276
 277         if (job->bos) {
 278                 for (i = 0; i < job->bo_count; i++)
 279                         drm_gem_object_put_unlocked(job->bos[i]);
 280                 kvfree(job->bos);
 281         }
 282
 283         kfree(job);
 284 }
 285
 286 void panfrost_job_put(struct panfrost_job *job)
 287 {
 288         kref_put(&job->refcount, panfrost_job_cleanup);
 289 }
 290
 291 static void panfrost_job_free(struct drm_sched_job *sched_job)
 292 {
 293         struct panfrost_job *job = to_panfrost_job(sched_job);
 294
 295         drm_sched_job_cleanup(sched_job);
 296
 297         panfrost_job_put(job);
 298 }
 299
 300 static struct dma_fence *panfrost_job_dependency(struct drm_sched_job *sched_job,
 301                                                  struct drm_sched_entity *s_entity)
 302 {
 303         struct panfrost_job *job = to_panfrost_job(sched_job);
 304         struct dma_fence *fence;
 305         unsigned int i;
 306
 307         /* Explicit fences */
 308         for (i = 0; i < job->in_fence_count; i++) {
 309                 if (job->in_fences[i]) {
 310                         fence = job->in_fences[i];
 311                         job->in_fences[i] = NULL;
 312                         return fence;
 313                 }
 314         }
 315
 316         /* Implicit fences, max. one per BO */
 317         for (i = 0; i < job->bo_count; i++) {
 318                 if (job->implicit_fences[i]) {
 319                         fence = job->implicit_fences[i];
 320                         job->implicit_fences[i] = NULL;
 321                         return fence;
 322                 }
 323         }
 324
 325         return NULL;
 326 }
 327
 328 static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
 329 {
 330         struct panfrost_job *job = to_panfrost_job(sched_job);
 331         struct panfrost_device *pfdev = job->pfdev;
 332         int slot = panfrost_job_get_slot(job);
 333         struct dma_fence *fence = NULL;
 334
 335         if (unlikely(job->base.s_fence->finished.error))
 336                 return NULL;
 337
 338         pfdev->jobs[slot] = job;
 339
 340         fence = panfrost_fence_create(pfdev, slot);
 341         if (IS_ERR(fence))
 342                 return NULL;
 343
 344         if (job->done_fence)
 345                 dma_fence_put(job->done_fence);
 346         job->done_fence = dma_fence_get(fence);
 347
 348         panfrost_job_hw_submit(job, slot);
 349
 350         return fence;
 351 }
 352
 353 void panfrost_job_enable_interrupts(struct panfrost_device *pfdev)
 354 {
 355         int j;
 356         u32 irq_mask = 0;
 357
 358         for (j = 0; j < NUM_JOB_SLOTS; j++) {
 359                 irq_mask |= MK_JS_MASK(j);
 360         }
 361
 362         job_write(pfdev, JOB_INT_CLEAR, irq_mask);
 363         job_write(pfdev, JOB_INT_MASK, irq_mask);
 364 }
 365
 366 static void panfrost_job_timedout(struct drm_sched_job *sched_job)
 367 {
 368         struct panfrost_job *job = to_panfrost_job(sched_job);
 369         struct panfrost_device *pfdev = job->pfdev;
 370         int js = panfrost_job_get_slot(job);
 371         int i;
 372
 373         /*
 374          * If the GPU managed to complete this jobs fence, the timeout is
 375          * spurious. Bail out.
 376          */
 377         if (dma_fence_is_signaled(job->done_fence))
 378                 return;
 379
 380         dev_err(pfdev->dev, "gpu sched timeout, js=%d, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p",
 381                 js,
 382                 job_read(pfdev, JS_STATUS(js)),
 383                 job_read(pfdev, JS_HEAD_LO(js)),
 384                 job_read(pfdev, JS_TAIL_LO(js)),
 385                 sched_job);
 386
 387         if (!mutex_trylock(&pfdev->reset_lock))
 388                 return;
 389
 390         for (i = 0; i < NUM_JOB_SLOTS; i++) {
 391                 struct drm_gpu_scheduler *sched = &pfdev->js->queue[i].sched;
 392
 393                 drm_sched_stop(sched, sched_job);
 394                 if (js != i)
 395                         /* Ensure any timeouts on other slots have finished */
 396                         cancel_delayed_work_sync(&sched->work_tdr);
 397         }
 398
 399         drm_sched_increase_karma(sched_job);
 400
 401         /* panfrost_core_dump(pfdev); */
 402
 403         panfrost_devfreq_record_transition(pfdev, js);
 404         panfrost_gpu_soft_reset(pfdev);
 405
 406         /* TODO: Re-enable all other address spaces */
 407         panfrost_mmu_enable(pfdev, 0);
 408         panfrost_gpu_power_on(pfdev);
 409         panfrost_job_enable_interrupts(pfdev);
 410
 411         for (i = 0; i < NUM_JOB_SLOTS; i++)
 412                 drm_sched_resubmit_jobs(&pfdev->js->queue[i].sched);
 413
 414         /* restart scheduler after GPU is usable again */
 415         for (i = 0; i < NUM_JOB_SLOTS; i++)
 416                 drm_sched_start(&pfdev->js->queue[i].sched, true);
 417
 418         mutex_unlock(&pfdev->reset_lock);
 419 }
 420
 421 static const struct drm_sched_backend_ops panfrost_sched_ops = {
 422         .dependency = panfrost_job_dependency,
 423         .run_job = panfrost_job_run,
 424         .timedout_job = panfrost_job_timedout,
 425         .free_job = panfrost_job_free
 426 };
 427
 428 static irqreturn_t panfrost_job_irq_handler(int irq, void *data)
 429 {
 430         struct panfrost_device *pfdev = data;
 431         u32 status = job_read(pfdev, JOB_INT_STAT);
 432         int j;
 433
 434         dev_dbg(pfdev->dev, "jobslot irq status=%x\n", status);
 435
 436         if (!status)
 437                 return IRQ_NONE;
 438
 439         pm_runtime_mark_last_busy(pfdev->dev);
 440
 441         for (j = 0; status; j++) {
 442                 u32 mask = MK_JS_MASK(j);
 443
 444                 if (!(status & mask))
 445                         continue;
 446
 447                 job_write(pfdev, JOB_INT_CLEAR, mask);
 448
 449                 if (status & JOB_INT_MASK_ERR(j)) {
 450                         job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_NOP);
 451
 452                         dev_err(pfdev->dev, "js fault, js=%d, status=%s, head=0x%x, tail=0x%x",
 453                                 j,
 454                                 panfrost_exception_name(pfdev, job_read(pfdev, JS_STATUS(j))),
 455                                 job_read(pfdev, JS_HEAD_LO(j)),
 456                                 job_read(pfdev, JS_TAIL_LO(j)));
 457
 458                         drm_sched_fault(&pfdev->js->queue[j].sched);
 459                 }
 460
 461                 if (status & JOB_INT_MASK_DONE(j)) {
 462                         panfrost_devfreq_record_transition(pfdev, j);
 463                         dma_fence_signal(pfdev->jobs[j]->done_fence);
 464                 }
 465
 466                 status &= ~mask;
 467         }
 468
 469         return IRQ_HANDLED;
 470 }
 471
 472 int panfrost_job_init(struct panfrost_device *pfdev)
 473 {
 474         struct panfrost_job_slot *js;
 475         int ret, j, irq;
 476
 477         pfdev->js = js = devm_kzalloc(pfdev->dev, sizeof(*js), GFP_KERNEL);
 478         if (!js)
 479                 return -ENOMEM;
 480
 481         spin_lock_init(&js->job_lock);
 482
 483         irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "job");
 484         if (irq <= 0)
 485                 return -ENODEV;
 486
 487         ret = devm_request_irq(pfdev->dev, irq, panfrost_job_irq_handler,
 488                                IRQF_SHARED, "job", pfdev);
 489         if (ret) {
 490                 dev_err(pfdev->dev, "failed to request job irq");
 491                 return ret;
 492         }
 493
 494         for (j = 0; j < NUM_JOB_SLOTS; j++) {
 495                 js->queue[j].fence_context = dma_fence_context_alloc(1);
 496
 497                 ret = drm_sched_init(&js->queue[j].sched,
 498                                      &panfrost_sched_ops,
 499                                      1, 0, msecs_to_jiffies(500),
 500                                      "pan_js");
 501                 if (ret) {
 502                         dev_err(pfdev->dev, "Failed to create scheduler: %d.", ret);
 503                         goto err_sched;
 504                 }
 505         }
 506
 507         panfrost_job_enable_interrupts(pfdev);
 508
 509         return 0;
 510
 511 err_sched:
 512         for (j--; j >= 0; j--)
 513                 drm_sched_fini(&js->queue[j].sched);
 514
 515         return ret;
 516 }
 517
 518 void panfrost_job_fini(struct panfrost_device *pfdev)
 519 {
 520         struct panfrost_job_slot *js = pfdev->js;
 521         int j;
 522
 523         job_write(pfdev, JOB_INT_MASK, 0);
 524
 525         for (j = 0; j < NUM_JOB_SLOTS; j++)
 526                 drm_sched_fini(&js->queue[j].sched);
 527
 528 }
 529
 530 int panfrost_job_open(struct panfrost_file_priv *panfrost_priv)
 531 {
 532         struct panfrost_device *pfdev = panfrost_priv->pfdev;
 533         struct panfrost_job_slot *js = pfdev->js;
 534         struct drm_sched_rq *rq;
 535         int ret, i;
 536
 537         for (i = 0; i < NUM_JOB_SLOTS; i++) {
 538                 rq = &js->queue[i].sched.sched_rq[DRM_SCHED_PRIORITY_NORMAL];
 539                 ret = drm_sched_entity_init(&panfrost_priv->sched_entity[i], &rq, 1, NULL);
 540                 if (WARN_ON(ret))
 541                         return ret;
 542         }
 543         return 0;
 544 }
 545
 546 void panfrost_job_close(struct panfrost_file_priv *panfrost_priv)
 547 {
 548         int i;
 549
 550         for (i = 0; i < NUM_JOB_SLOTS; i++)
 551                 drm_sched_entity_destroy(&panfrost_priv->sched_entity[i]);
 552 }
 553
 554 int panfrost_job_is_idle(struct panfrost_device *pfdev)
 555 {
 556         struct panfrost_job_slot *js = pfdev->js;
 557         int i;
 558
 559         for (i = 0; i < NUM_JOB_SLOTS; i++) {
 560                 /* If there are any jobs in the HW queue, we're not idle */
 561                 if (atomic_read(&js->queue[i].sched.hw_rq_count))
 562                         return false;
 563
 564                 /* Check whether the hardware is idle */
 565                 if (pfdev->devfreq.slot[i].busy)
 566                         return false;
 567         }
 568
 569         return true;
 570 }