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
 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
 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
 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
 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
 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
 281 void panfrost_job_put(struct panfrost_job *job)
 282 {
 283         kref_put(&job->refcount, panfrost_job_cleanup);
 284 }
 285
 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
 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
 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
 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
 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_devfreq_record_transition(pfdev, js);
 408         panfrost_device_reset(pfdev);
 409
 410         for (i = 0; i < NUM_JOB_SLOTS; i++)
 411                 drm_sched_resubmit_jobs(&pfdev->js->queue[i].sched);
 412
 413         /* restart scheduler after GPU is usable again */
 414         for (i = 0; i < NUM_JOB_SLOTS; i++)
 415                 drm_sched_start(&pfdev->js->queue[i].sched, true);
 416
 417         mutex_unlock(&pfdev->reset_lock);
 418 }
 419
 420 static const struct drm_sched_backend_ops panfrost_sched_ops = {
 421         .dependency = panfrost_job_dependency,
 422         .run_job = panfrost_job_run,
 423         .timedout_job = panfrost_job_timedout,
 424         .free_job = panfrost_job_free
 425 };
 426
 427 static irqreturn_t panfrost_job_irq_handler(int irq, void *data)
 428 {
 429         struct panfrost_device *pfdev = data;
 430         u32 status = job_read(pfdev, JOB_INT_STAT);
 431         int j;
 432
 433         dev_dbg(pfdev->dev, "jobslot irq status=%x\n", status);
 434
 435         if (!status)
 436                 return IRQ_NONE;
 437
 438         pm_runtime_mark_last_busy(pfdev->dev);
 439
 440         for (j = 0; status; j++) {
 441                 u32 mask = MK_JS_MASK(j);
 442
 443                 if (!(status & mask))
 444                         continue;
 445
 446                 job_write(pfdev, JOB_INT_CLEAR, mask);
 447
 448                 if (status & JOB_INT_MASK_ERR(j)) {
 449                         job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_NOP);
 450
 451                         dev_err(pfdev->dev, "js fault, js=%d, status=%s, head=0x%x, tail=0x%x",
 452                                 j,
 453                                 panfrost_exception_name(pfdev, job_read(pfdev, JS_STATUS(j))),
 454                                 job_read(pfdev, JS_HEAD_LO(j)),
 455                                 job_read(pfdev, JS_TAIL_LO(j)));
 456
 457                         drm_sched_fault(&pfdev->js->queue[j].sched);
 458                 }
 459
 460                 if (status & JOB_INT_MASK_DONE(j)) {
 461                         struct panfrost_job *job;
 462
 463                         spin_lock(&pfdev->js->job_lock);
 464                         job = pfdev->jobs[j];
 465                         /* Only NULL if job timeout occurred */
 466                         if (job) {
 467                                 pfdev->jobs[j] = NULL;
 468
 469                                 panfrost_mmu_as_put(pfdev, &job->file_priv->mmu);
 470                                 panfrost_devfreq_record_transition(pfdev, j);
 471
 472                                 dma_fence_signal_locked(job->done_fence);
 473                                 pm_runtime_put_autosuspend(pfdev->dev);
 474                         }
 475                         spin_unlock(&pfdev->js->job_lock);
 476                 }
 477
 478                 status &= ~mask;
 479         }
 480
 481         return IRQ_HANDLED;
 482 }
 483
 484 int panfrost_job_init(struct panfrost_device *pfdev)
 485 {
 486         struct panfrost_job_slot *js;
 487         int ret, j, irq;
 488
 489         pfdev->js = js = devm_kzalloc(pfdev->dev, sizeof(*js), GFP_KERNEL);
 490         if (!js)
 491                 return -ENOMEM;
 492
 493         spin_lock_init(&js->job_lock);
 494
 495         irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "job");
 496         if (irq <= 0)
 497                 return -ENODEV;
 498
 499         ret = devm_request_irq(pfdev->dev, irq, panfrost_job_irq_handler,
 500                                IRQF_SHARED, "job", pfdev);
 501         if (ret) {
 502                 dev_err(pfdev->dev, "failed to request job irq");
 503                 return ret;
 504         }
 505
 506         for (j = 0; j < NUM_JOB_SLOTS; j++) {
 507                 js->queue[j].fence_context = dma_fence_context_alloc(1);
 508
 509                 ret = drm_sched_init(&js->queue[j].sched,
 510                                      &panfrost_sched_ops,
 511                                      1, 0, msecs_to_jiffies(500),
 512                                      "pan_js");
 513                 if (ret) {
 514                         dev_err(pfdev->dev, "Failed to create scheduler: %d.", ret);
 515                         goto err_sched;
 516                 }
 517         }
 518
 519         panfrost_job_enable_interrupts(pfdev);
 520
 521         return 0;
 522
 523 err_sched:
 524         for (j--; j >= 0; j--)
 525                 drm_sched_fini(&js->queue[j].sched);
 526
 527         return ret;
 528 }
 529
 530 void panfrost_job_fini(struct panfrost_device *pfdev)
 531 {
 532         struct panfrost_job_slot *js = pfdev->js;
 533         int j;
 534
 535         job_write(pfdev, JOB_INT_MASK, 0);
 536
 537         for (j = 0; j < NUM_JOB_SLOTS; j++)
 538                 drm_sched_fini(&js->queue[j].sched);
 539
 540 }
 541
 542 int panfrost_job_open(struct panfrost_file_priv *panfrost_priv)
 543 {
 544         struct panfrost_device *pfdev = panfrost_priv->pfdev;
 545         struct panfrost_job_slot *js = pfdev->js;
 546         struct drm_sched_rq *rq;
 547         int ret, i;
 548
 549         for (i = 0; i < NUM_JOB_SLOTS; i++) {
 550                 rq = &js->queue[i].sched.sched_rq[DRM_SCHED_PRIORITY_NORMAL];
 551                 ret = drm_sched_entity_init(&panfrost_priv->sched_entity[i], &rq, 1, NULL);
 552                 if (WARN_ON(ret))
 553                         return ret;
 554         }
 555         return 0;
 556 }
 557
 558 void panfrost_job_close(struct panfrost_file_priv *panfrost_priv)
 559 {
 560         int i;
 561
 562         for (i = 0; i < NUM_JOB_SLOTS; i++)
 563                 drm_sched_entity_destroy(&panfrost_priv->sched_entity[i]);
 564 }
 565
 566 int panfrost_job_is_idle(struct panfrost_device *pfdev)
 567 {
 568         struct panfrost_job_slot *js = pfdev->js;
 569         int i;
 570
 571         for (i = 0; i < NUM_JOB_SLOTS; i++) {
 572                 /* If there are any jobs in the HW queue, we're not idle */
 573                 if (atomic_read(&js->queue[i].sched.hw_rq_count))
 574                         return false;
 575
 576                 /* Check whether the hardware is idle */
 577                 if (pfdev->devfreq.slot[i].busy)
 578                         return false;
 579         }
 580
 581         return true;
 582 }