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/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 *
  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         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         panfrost_devfreq_record_busy(pfdev);
 159
 160         job_write(pfdev, JS_HEAD_NEXT_LO(js), jc_head & 0xFFFFFFFF);
 161         job_write(pfdev, JS_HEAD_NEXT_HI(js), jc_head >> 32);
 162
 163         panfrost_job_write_affinity(pfdev, job->requirements, js);
 164
 165         /* start MMU, medium priority, cache clean/flush on end, clean/flush on
 166          * start */
 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
 189 static void panfrost_acquire_object_fences(struct drm_gem_object **bos,
 190                                            int bo_count,
 191                                            struct dma_fence **implicit_fences)
 192 {
 193         int i;
 194
 195         for (i = 0; i < bo_count; i++)
 196                 implicit_fences[i] = dma_resv_get_excl_rcu(bos[i]->resv);
 197 }
 198
 199 static void panfrost_attach_object_fences(struct drm_gem_object **bos,
 200                                           int bo_count,
 201                                           struct dma_fence *fence)
 202 {
 203         int i;
 204
 205         for (i = 0; i < bo_count; i++)
 206                 dma_resv_add_excl_fence(bos[i]->resv, fence);
 207 }
 208
 209 int panfrost_job_push(struct panfrost_job *job)
 210 {
 211         struct panfrost_device *pfdev = job->pfdev;
 212         int slot = panfrost_job_get_slot(job);
 213         struct drm_sched_entity *entity = &job->file_priv->sched_entity[slot];
 214         struct ww_acquire_ctx acquire_ctx;
 215         int ret = 0;
 216
 217         mutex_lock(&pfdev->sched_lock);
 218
 219         ret = drm_gem_lock_reservations(job->bos, job->bo_count,
 220                                             &acquire_ctx);
 221         if (ret) {
 222                 mutex_unlock(&pfdev->sched_lock);
 223                 return ret;
 224         }
 225
 226         ret = drm_sched_job_init(&job->base, entity, NULL);
 227         if (ret) {
 228                 mutex_unlock(&pfdev->sched_lock);
 229                 goto unlock;
 230         }
 231
 232         job->render_done_fence = dma_fence_get(&job->base.s_fence->finished);
 233
 234         kref_get(&job->refcount); /* put by scheduler job completion */
 235
 236         panfrost_acquire_object_fences(job->bos, job->bo_count,
 237                                        job->implicit_fences);
 238
 239         drm_sched_entity_push_job(&job->base, entity);
 240
 241         mutex_unlock(&pfdev->sched_lock);
 242
 243         panfrost_attach_object_fences(job->bos, job->bo_count,
 244                                       job->render_done_fence);
 245
 246 unlock:
 247         drm_gem_unlock_reservations(job->bos, job->bo_count, &acquire_ctx);
 248
 249         return ret;
 250 }
 251
 252 static void panfrost_job_cleanup(struct kref *ref)
 253 {
 254         struct panfrost_job *job = container_of(ref, struct panfrost_job,
 255                                                 refcount);
 256         unsigned int i;
 257
 258         if (job->in_fences) {
 259                 for (i = 0; i < job->in_fence_count; i++)
 260                         dma_fence_put(job->in_fences[i]);
 261                 kvfree(job->in_fences);
 262         }
 263         if (job->implicit_fences) {
 264                 for (i = 0; i < job->bo_count; i++)
 265                         dma_fence_put(job->implicit_fences[i]);
 266                 kvfree(job->implicit_fences);
 267         }
 268         dma_fence_put(job->done_fence);
 269         dma_fence_put(job->render_done_fence);
 270
 271         if (job->mappings) {
 272                 for (i = 0; i < job->bo_count; i++) {
 273                         if (!job->mappings[i])
 274                                 break;
 275
 276                         atomic_dec(&job->mappings[i]->obj->gpu_usecount);
 277                         panfrost_gem_mapping_put(job->mappings[i]);
 278                 }
 279                 kvfree(job->mappings);
 280         }
 281
 282         if (job->bos) {
 283                 for (i = 0; i < job->bo_count; i++)
 284                         drm_gem_object_put(job->bos[i]);
 285
 286                 kvfree(job->bos);
 287         }
 288
 289         kfree(job);
 290 }
 291
 292 void panfrost_job_put(struct panfrost_job *job)
 293 {
 294         kref_put(&job->refcount, panfrost_job_cleanup);
 295 }
 296
 297 static void panfrost_job_free(struct drm_sched_job *sched_job)
 298 {
 299         struct panfrost_job *job = to_panfrost_job(sched_job);
 300
 301         drm_sched_job_cleanup(sched_job);
 302
 303         panfrost_job_put(job);
 304 }
 305
 306 static struct dma_fence *panfrost_job_dependency(struct drm_sched_job *sched_job,
 307                                                  struct drm_sched_entity *s_entity)
 308 {
 309         struct panfrost_job *job = to_panfrost_job(sched_job);
 310         struct dma_fence *fence;
 311         unsigned int i;
 312
 313         /* Explicit fences */
 314         for (i = 0; i < job->in_fence_count; i++) {
 315                 if (job->in_fences[i]) {
 316                         fence = job->in_fences[i];
 317                         job->in_fences[i] = NULL;
 318                         return fence;
 319                 }
 320         }
 321
 322         /* Implicit fences, max. one per BO */
 323         for (i = 0; i < job->bo_count; i++) {
 324                 if (job->implicit_fences[i]) {
 325                         fence = job->implicit_fences[i];
 326                         job->implicit_fences[i] = NULL;
 327                         return fence;
 328                 }
 329         }
 330
 331         return NULL;
 332 }
 333
 334 static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
 335 {
 336         struct panfrost_job *job = to_panfrost_job(sched_job);
 337         struct panfrost_device *pfdev = job->pfdev;
 338         int slot = panfrost_job_get_slot(job);
 339         struct dma_fence *fence = NULL;
 340
 341         if (unlikely(job->base.s_fence->finished.error))
 342                 return NULL;
 343
 344         pfdev->jobs[slot] = job;
 345
 346         fence = panfrost_fence_create(pfdev, slot);
 347         if (IS_ERR(fence))
 348                 return NULL;
 349
 350         if (job->done_fence)
 351                 dma_fence_put(job->done_fence);
 352         job->done_fence = dma_fence_get(fence);
 353
 354         panfrost_job_hw_submit(job, slot);
 355
 356         return fence;
 357 }
 358
 359 void panfrost_job_enable_interrupts(struct panfrost_device *pfdev)
 360 {
 361         int j;
 362         u32 irq_mask = 0;
 363
 364         for (j = 0; j < NUM_JOB_SLOTS; j++) {
 365                 irq_mask |= MK_JS_MASK(j);
 366         }
 367
 368         job_write(pfdev, JOB_INT_CLEAR, irq_mask);
 369         job_write(pfdev, JOB_INT_MASK, irq_mask);
 370 }
 371
 372 static void panfrost_job_timedout(struct drm_sched_job *sched_job)
 373 {
 374         struct panfrost_job *job = to_panfrost_job(sched_job);
 375         struct panfrost_device *pfdev = job->pfdev;
 376         int js = panfrost_job_get_slot(job);
 377         unsigned long flags;
 378         int i;
 379
 380         /*
 381          * If the GPU managed to complete this jobs fence, the timeout is
 382          * spurious. Bail out.
 383          */
 384         if (dma_fence_is_signaled(job->done_fence))
 385                 return;
 386
 387         dev_err(pfdev->dev, "gpu sched timeout, js=%d, config=0x%x, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p",
 388                 js,
 389                 job_read(pfdev, JS_CONFIG(js)),
 390                 job_read(pfdev, JS_STATUS(js)),
 391                 job_read(pfdev, JS_HEAD_LO(js)),
 392                 job_read(pfdev, JS_TAIL_LO(js)),
 393                 sched_job);
 394
 395         if (!mutex_trylock(&pfdev->reset_lock))
 396                 return;
 397
 398         for (i = 0; i < NUM_JOB_SLOTS; i++) {
 399                 struct drm_gpu_scheduler *sched = &pfdev->js->queue[i].sched;
 400
 401                 drm_sched_stop(sched, sched_job);
 402                 if (js != i)
 403                         /* Ensure any timeouts on other slots have finished */
 404                         cancel_delayed_work_sync(&sched->work_tdr);
 405         }
 406
 407         drm_sched_increase_karma(sched_job);
 408
 409         spin_lock_irqsave(&pfdev->js->job_lock, flags);
 410         for (i = 0; i < NUM_JOB_SLOTS; i++) {
 411                 if (pfdev->jobs[i]) {
 412                         pm_runtime_put_noidle(pfdev->dev);
 413                         pfdev->jobs[i] = NULL;
 414                 }
 415         }
 416         spin_unlock_irqrestore(&pfdev->js->job_lock, flags);
 417
 418         panfrost_devfreq_record_idle(pfdev);
 419         panfrost_device_reset(pfdev);
 420
 421         for (i = 0; i < NUM_JOB_SLOTS; i++)
 422                 drm_sched_resubmit_jobs(&pfdev->js->queue[i].sched);
 423
 424         /* restart scheduler after GPU is usable again */
 425         for (i = 0; i < NUM_JOB_SLOTS; i++)
 426                 drm_sched_start(&pfdev->js->queue[i].sched, true);
 427
 428         mutex_unlock(&pfdev->reset_lock);
 429 }
 430
 431 static const struct drm_sched_backend_ops panfrost_sched_ops = {
 432         .dependency = panfrost_job_dependency,
 433         .run_job = panfrost_job_run,
 434         .timedout_job = panfrost_job_timedout,
 435         .free_job = panfrost_job_free
 436 };
 437
 438 static irqreturn_t panfrost_job_irq_handler(int irq, void *data)
 439 {
 440         struct panfrost_device *pfdev = data;
 441         u32 status = job_read(pfdev, JOB_INT_STAT);
 442         int j;
 443
 444         dev_dbg(pfdev->dev, "jobslot irq status=%x\n", status);
 445
 446         if (!status)
 447                 return IRQ_NONE;
 448
 449         pm_runtime_mark_last_busy(pfdev->dev);
 450
 451         for (j = 0; status; j++) {
 452                 u32 mask = MK_JS_MASK(j);
 453
 454                 if (!(status & mask))
 455                         continue;
 456
 457                 job_write(pfdev, JOB_INT_CLEAR, mask);
 458
 459                 if (status & JOB_INT_MASK_ERR(j)) {
 460                         job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_NOP);
 461
 462                         dev_err(pfdev->dev, "js fault, js=%d, status=%s, head=0x%x, tail=0x%x",
 463                                 j,
 464                                 panfrost_exception_name(pfdev, job_read(pfdev, JS_STATUS(j))),
 465                                 job_read(pfdev, JS_HEAD_LO(j)),
 466                                 job_read(pfdev, JS_TAIL_LO(j)));
 467
 468                         drm_sched_fault(&pfdev->js->queue[j].sched);
 469                 }
 470
 471                 if (status & JOB_INT_MASK_DONE(j)) {
 472                         struct panfrost_job *job;
 473
 474                         spin_lock(&pfdev->js->job_lock);
 475                         job = pfdev->jobs[j];
 476                         /* Only NULL if job timeout occurred */
 477                         if (job) {
 478                                 pfdev->jobs[j] = NULL;
 479
 480                                 panfrost_mmu_as_put(pfdev, &job->file_priv->mmu);
 481                                 panfrost_devfreq_record_idle(pfdev);
 482
 483                                 dma_fence_signal_locked(job->done_fence);
 484                                 pm_runtime_put_autosuspend(pfdev->dev);
 485                         }
 486                         spin_unlock(&pfdev->js->job_lock);
 487                 }
 488
 489                 status &= ~mask;
 490         }
 491
 492         return IRQ_HANDLED;
 493 }
 494
 495 int panfrost_job_init(struct panfrost_device *pfdev)
 496 {
 497         struct panfrost_job_slot *js;
 498         int ret, j, irq;
 499
 500         pfdev->js = js = devm_kzalloc(pfdev->dev, sizeof(*js), GFP_KERNEL);
 501         if (!js)
 502                 return -ENOMEM;
 503
 504         spin_lock_init(&js->job_lock);
 505
 506         irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "job");
 507         if (irq <= 0)
 508                 return -ENODEV;
 509
 510         ret = devm_request_irq(pfdev->dev, irq, panfrost_job_irq_handler,
 511                                IRQF_SHARED, KBUILD_MODNAME "-job", pfdev);
 512         if (ret) {
 513                 dev_err(pfdev->dev, "failed to request job irq");
 514                 return ret;
 515         }
 516
 517         for (j = 0; j < NUM_JOB_SLOTS; j++) {
 518                 js->queue[j].fence_context = dma_fence_context_alloc(1);
 519
 520                 ret = drm_sched_init(&js->queue[j].sched,
 521                                      &panfrost_sched_ops,
 522                                      1, 0, msecs_to_jiffies(500),
 523                                      "pan_js");
 524                 if (ret) {
 525                         dev_err(pfdev->dev, "Failed to create scheduler: %d.", ret);
 526                         goto err_sched;
 527                 }
 528         }
 529
 530         panfrost_job_enable_interrupts(pfdev);
 531
 532         return 0;
 533
 534 err_sched:
 535         for (j--; j >= 0; j--)
 536                 drm_sched_fini(&js->queue[j].sched);
 537
 538         return ret;
 539 }
 540
 541 void panfrost_job_fini(struct panfrost_device *pfdev)
 542 {
 543         struct panfrost_job_slot *js = pfdev->js;
 544         int j;
 545
 546         job_write(pfdev, JOB_INT_MASK, 0);
 547
 548         for (j = 0; j < NUM_JOB_SLOTS; j++)
 549                 drm_sched_fini(&js->queue[j].sched);
 550
 551 }
 552
 553 int panfrost_job_open(struct panfrost_file_priv *panfrost_priv)
 554 {
 555         struct panfrost_device *pfdev = panfrost_priv->pfdev;
 556         struct panfrost_job_slot *js = pfdev->js;
 557         struct drm_gpu_scheduler *sched;
 558         int ret, i;
 559
 560         for (i = 0; i < NUM_JOB_SLOTS; i++) {
 561                 sched = &js->queue[i].sched;
 562                 ret = drm_sched_entity_init(&panfrost_priv->sched_entity[i],
 563                                             DRM_SCHED_PRIORITY_NORMAL, &sched,
 564                                             1, NULL);
 565                 if (WARN_ON(ret))
 566                         return ret;
 567         }
 568         return 0;
 569 }
 570
 571 void panfrost_job_close(struct panfrost_file_priv *panfrost_priv)
 572 {
 573         int i;
 574
 575         for (i = 0; i < NUM_JOB_SLOTS; i++)
 576                 drm_sched_entity_destroy(&panfrost_priv->sched_entity[i]);
 577 }
 578
 579 int panfrost_job_is_idle(struct panfrost_device *pfdev)
 580 {
 581         struct panfrost_job_slot *js = pfdev->js;
 582         int i;
 583
 584         /* Check whether the hardware is idle */
 585         if (atomic_read(&pfdev->devfreq.busy_count))
 586                 return false;
 587
 588         for (i = 0; i < NUM_JOB_SLOTS; i++) {
 589                 /* If there are any jobs in the HW queue, we're not idle */
 590                 if (atomic_read(&js->queue[i].sched.hw_rq_count))
 591                         return false;
 592         }
 593
 594         return true;
 595 }