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_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 }; 428 429 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 } 485 486 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 } 531 532 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 } 543 544 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 } 559 560 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 } 567 568 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