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/iopoll.h> 8 #include <linux/platform_device.h> 9 #include <linux/pm_runtime.h> 10 #include <linux/dma-resv.h> 11 #include <drm/gpu_scheduler.h> 12 #include <drm/panfrost_drm.h> 13 14 #include "panfrost_device.h" 15 #include "panfrost_devfreq.h" 16 #include "panfrost_job.h" 17 #include "panfrost_features.h" 18 #include "panfrost_issues.h" 19 #include "panfrost_gem.h" 20 #include "panfrost_regs.h" 21 #include "panfrost_gpu.h" 22 #include "panfrost_mmu.h" 23 24 #define JOB_TIMEOUT_MS 500 25 26 #define job_write(dev, reg, data) writel(data, dev->iomem + (reg)) 27 #define job_read(dev, reg) readl(dev->iomem + (reg)) 28 29 struct panfrost_queue_state { 30 struct drm_gpu_scheduler sched; 31 u64 fence_context; 32 u64 emit_seqno; 33 }; 34 35 struct panfrost_job_slot { 36 struct panfrost_queue_state queue[NUM_JOB_SLOTS]; 37 spinlock_t job_lock; 38 int irq; 39 }; 40 41 static struct panfrost_job * 42 to_panfrost_job(struct drm_sched_job *sched_job) 43 { 44 return container_of(sched_job, struct panfrost_job, base); 45 } 46 47 struct panfrost_fence { 48 struct dma_fence base; 49 struct drm_device *dev; 50 /* panfrost seqno for signaled() test */ 51 u64 seqno; 52 int queue; 53 }; 54 55 static inline struct panfrost_fence * 56 to_panfrost_fence(struct dma_fence *fence) 57 { 58 return (struct panfrost_fence *)fence; 59 } 60 61 static const char *panfrost_fence_get_driver_name(struct dma_fence *fence) 62 { 63 return "panfrost"; 64 } 65 66 static const char *panfrost_fence_get_timeline_name(struct dma_fence *fence) 67 { 68 struct panfrost_fence *f = to_panfrost_fence(fence); 69 70 switch (f->queue) { 71 case 0: 72 return "panfrost-js-0"; 73 case 1: 74 return "panfrost-js-1"; 75 case 2: 76 return "panfrost-js-2"; 77 default: 78 return NULL; 79 } 80 } 81 82 static const struct dma_fence_ops panfrost_fence_ops = { 83 .get_driver_name = panfrost_fence_get_driver_name, 84 .get_timeline_name = panfrost_fence_get_timeline_name, 85 }; 86 87 static struct dma_fence *panfrost_fence_create(struct panfrost_device *pfdev, int js_num) 88 { 89 struct panfrost_fence *fence; 90 struct panfrost_job_slot *js = pfdev->js; 91 92 fence = kzalloc(sizeof(*fence), GFP_KERNEL); 93 if (!fence) 94 return ERR_PTR(-ENOMEM); 95 96 fence->dev = pfdev->ddev; 97 fence->queue = js_num; 98 fence->seqno = ++js->queue[js_num].emit_seqno; 99 dma_fence_init(&fence->base, &panfrost_fence_ops, &js->job_lock, 100 js->queue[js_num].fence_context, fence->seqno); 101 102 return &fence->base; 103 } 104 105 int panfrost_job_get_slot(struct panfrost_job *job) 106 { 107 /* JS0: fragment jobs. 108 * JS1: vertex/tiler jobs 109 * JS2: compute jobs 110 */ 111 if (job->requirements & PANFROST_JD_REQ_FS) 112 return 0; 113 114 /* Not exposed to userspace yet */ 115 #if 0 116 if (job->requirements & PANFROST_JD_REQ_ONLY_COMPUTE) { 117 if ((job->requirements & PANFROST_JD_REQ_CORE_GRP_MASK) && 118 (job->pfdev->features.nr_core_groups == 2)) 119 return 2; 120 if (panfrost_has_hw_issue(job->pfdev, HW_ISSUE_8987)) 121 return 2; 122 } 123 #endif 124 return 1; 125 } 126 127 static void panfrost_job_write_affinity(struct panfrost_device *pfdev, 128 u32 requirements, 129 int js) 130 { 131 u64 affinity; 132 133 /* 134 * Use all cores for now. 135 * Eventually we may need to support tiler only jobs and h/w with 136 * multiple (2) coherent core groups 137 */ 138 affinity = pfdev->features.shader_present; 139 140 job_write(pfdev, JS_AFFINITY_NEXT_LO(js), lower_32_bits(affinity)); 141 job_write(pfdev, JS_AFFINITY_NEXT_HI(js), upper_32_bits(affinity)); 142 } 143 144 static u32 145 panfrost_get_job_chain_flag(const struct panfrost_job *job) 146 { 147 struct panfrost_fence *f = to_panfrost_fence(job->done_fence); 148 149 if (!panfrost_has_hw_feature(job->pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION)) 150 return 0; 151 152 return (f->seqno & 1) ? JS_CONFIG_JOB_CHAIN_FLAG : 0; 153 } 154 155 static struct panfrost_job * 156 panfrost_dequeue_job(struct panfrost_device *pfdev, int slot) 157 { 158 struct panfrost_job *job = pfdev->jobs[slot][0]; 159 160 WARN_ON(!job); 161 pfdev->jobs[slot][0] = pfdev->jobs[slot][1]; 162 pfdev->jobs[slot][1] = NULL; 163 164 return job; 165 } 166 167 static unsigned int 168 panfrost_enqueue_job(struct panfrost_device *pfdev, int slot, 169 struct panfrost_job *job) 170 { 171 if (WARN_ON(!job)) 172 return 0; 173 174 if (!pfdev->jobs[slot][0]) { 175 pfdev->jobs[slot][0] = job; 176 return 0; 177 } 178 179 WARN_ON(pfdev->jobs[slot][1]); 180 pfdev->jobs[slot][1] = job; 181 WARN_ON(panfrost_get_job_chain_flag(job) == 182 panfrost_get_job_chain_flag(pfdev->jobs[slot][0])); 183 return 1; 184 } 185 186 static void panfrost_job_hw_submit(struct panfrost_job *job, int js) 187 { 188 struct panfrost_device *pfdev = job->pfdev; 189 unsigned int subslot; 190 u32 cfg; 191 u64 jc_head = job->jc; 192 int ret; 193 194 panfrost_devfreq_record_busy(&pfdev->pfdevfreq); 195 196 ret = pm_runtime_get_sync(pfdev->dev); 197 if (ret < 0) 198 return; 199 200 if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js)))) { 201 return; 202 } 203 204 cfg = panfrost_mmu_as_get(pfdev, job->file_priv->mmu); 205 206 job_write(pfdev, JS_HEAD_NEXT_LO(js), lower_32_bits(jc_head)); 207 job_write(pfdev, JS_HEAD_NEXT_HI(js), upper_32_bits(jc_head)); 208 209 panfrost_job_write_affinity(pfdev, job->requirements, js); 210 211 /* start MMU, medium priority, cache clean/flush on end, clean/flush on 212 * start */ 213 cfg |= JS_CONFIG_THREAD_PRI(8) | 214 JS_CONFIG_START_FLUSH_CLEAN_INVALIDATE | 215 JS_CONFIG_END_FLUSH_CLEAN_INVALIDATE | 216 panfrost_get_job_chain_flag(job); 217 218 if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION)) 219 cfg |= JS_CONFIG_ENABLE_FLUSH_REDUCTION; 220 221 if (panfrost_has_hw_issue(pfdev, HW_ISSUE_10649)) 222 cfg |= JS_CONFIG_START_MMU; 223 224 job_write(pfdev, JS_CONFIG_NEXT(js), cfg); 225 226 if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION)) 227 job_write(pfdev, JS_FLUSH_ID_NEXT(js), job->flush_id); 228 229 /* GO ! */ 230 231 spin_lock(&pfdev->js->job_lock); 232 subslot = panfrost_enqueue_job(pfdev, js, job); 233 /* Don't queue the job if a reset is in progress */ 234 if (!atomic_read(&pfdev->reset.pending)) { 235 job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START); 236 dev_dbg(pfdev->dev, 237 "JS: Submitting atom %p to js[%d][%d] with head=0x%llx AS %d", 238 job, js, subslot, jc_head, cfg & 0xf); 239 } 240 spin_unlock(&pfdev->js->job_lock); 241 } 242 243 static int panfrost_acquire_object_fences(struct drm_gem_object **bos, 244 int bo_count, 245 struct drm_sched_job *job) 246 { 247 int i, ret; 248 249 for (i = 0; i < bo_count; i++) { 250 ret = dma_resv_reserve_fences(bos[i]->resv, 1); 251 if (ret) 252 return ret; 253 254 /* panfrost always uses write mode in its current uapi */ 255 ret = drm_sched_job_add_implicit_dependencies(job, bos[i], 256 true); 257 if (ret) 258 return ret; 259 } 260 261 return 0; 262 } 263 264 static void panfrost_attach_object_fences(struct drm_gem_object **bos, 265 int bo_count, 266 struct dma_fence *fence) 267 { 268 int i; 269 270 for (i = 0; i < bo_count; i++) 271 dma_resv_add_fence(bos[i]->resv, fence, DMA_RESV_USAGE_WRITE); 272 } 273 274 int panfrost_job_push(struct panfrost_job *job) 275 { 276 struct panfrost_device *pfdev = job->pfdev; 277 struct ww_acquire_ctx acquire_ctx; 278 int ret = 0; 279 280 ret = drm_gem_lock_reservations(job->bos, job->bo_count, 281 &acquire_ctx); 282 if (ret) 283 return ret; 284 285 mutex_lock(&pfdev->sched_lock); 286 drm_sched_job_arm(&job->base); 287 288 job->render_done_fence = dma_fence_get(&job->base.s_fence->finished); 289 290 ret = panfrost_acquire_object_fences(job->bos, job->bo_count, 291 &job->base); 292 if (ret) { 293 mutex_unlock(&pfdev->sched_lock); 294 goto unlock; 295 } 296 297 kref_get(&job->refcount); /* put by scheduler job completion */ 298 299 drm_sched_entity_push_job(&job->base); 300 301 mutex_unlock(&pfdev->sched_lock); 302 303 panfrost_attach_object_fences(job->bos, job->bo_count, 304 job->render_done_fence); 305 306 unlock: 307 drm_gem_unlock_reservations(job->bos, job->bo_count, &acquire_ctx); 308 309 return ret; 310 } 311 312 static void panfrost_job_cleanup(struct kref *ref) 313 { 314 struct panfrost_job *job = container_of(ref, struct panfrost_job, 315 refcount); 316 unsigned int i; 317 318 dma_fence_put(job->done_fence); 319 dma_fence_put(job->render_done_fence); 320 321 if (job->mappings) { 322 for (i = 0; i < job->bo_count; i++) { 323 if (!job->mappings[i]) 324 break; 325 326 atomic_dec(&job->mappings[i]->obj->gpu_usecount); 327 panfrost_gem_mapping_put(job->mappings[i]); 328 } 329 kvfree(job->mappings); 330 } 331 332 if (job->bos) { 333 for (i = 0; i < job->bo_count; i++) 334 drm_gem_object_put(job->bos[i]); 335 336 kvfree(job->bos); 337 } 338 339 kfree(job); 340 } 341 342 void panfrost_job_put(struct panfrost_job *job) 343 { 344 kref_put(&job->refcount, panfrost_job_cleanup); 345 } 346 347 static void panfrost_job_free(struct drm_sched_job *sched_job) 348 { 349 struct panfrost_job *job = to_panfrost_job(sched_job); 350 351 drm_sched_job_cleanup(sched_job); 352 353 panfrost_job_put(job); 354 } 355 356 static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job) 357 { 358 struct panfrost_job *job = to_panfrost_job(sched_job); 359 struct panfrost_device *pfdev = job->pfdev; 360 int slot = panfrost_job_get_slot(job); 361 struct dma_fence *fence = NULL; 362 363 if (unlikely(job->base.s_fence->finished.error)) 364 return NULL; 365 366 /* Nothing to execute: can happen if the job has finished while 367 * we were resetting the GPU. 368 */ 369 if (!job->jc) 370 return NULL; 371 372 fence = panfrost_fence_create(pfdev, slot); 373 if (IS_ERR(fence)) 374 return fence; 375 376 if (job->done_fence) 377 dma_fence_put(job->done_fence); 378 job->done_fence = dma_fence_get(fence); 379 380 panfrost_job_hw_submit(job, slot); 381 382 return fence; 383 } 384 385 void panfrost_job_enable_interrupts(struct panfrost_device *pfdev) 386 { 387 int j; 388 u32 irq_mask = 0; 389 390 for (j = 0; j < NUM_JOB_SLOTS; j++) { 391 irq_mask |= MK_JS_MASK(j); 392 } 393 394 job_write(pfdev, JOB_INT_CLEAR, irq_mask); 395 job_write(pfdev, JOB_INT_MASK, irq_mask); 396 } 397 398 static void panfrost_job_handle_err(struct panfrost_device *pfdev, 399 struct panfrost_job *job, 400 unsigned int js) 401 { 402 u32 js_status = job_read(pfdev, JS_STATUS(js)); 403 const char *exception_name = panfrost_exception_name(js_status); 404 bool signal_fence = true; 405 406 if (!panfrost_exception_is_fault(js_status)) { 407 dev_dbg(pfdev->dev, "js event, js=%d, status=%s, head=0x%x, tail=0x%x", 408 js, exception_name, 409 job_read(pfdev, JS_HEAD_LO(js)), 410 job_read(pfdev, JS_TAIL_LO(js))); 411 } else { 412 dev_err(pfdev->dev, "js fault, js=%d, status=%s, head=0x%x, tail=0x%x", 413 js, exception_name, 414 job_read(pfdev, JS_HEAD_LO(js)), 415 job_read(pfdev, JS_TAIL_LO(js))); 416 } 417 418 if (js_status == DRM_PANFROST_EXCEPTION_STOPPED) { 419 /* Update the job head so we can resume */ 420 job->jc = job_read(pfdev, JS_TAIL_LO(js)) | 421 ((u64)job_read(pfdev, JS_TAIL_HI(js)) << 32); 422 423 /* The job will be resumed, don't signal the fence */ 424 signal_fence = false; 425 } else if (js_status == DRM_PANFROST_EXCEPTION_TERMINATED) { 426 /* Job has been hard-stopped, flag it as canceled */ 427 dma_fence_set_error(job->done_fence, -ECANCELED); 428 job->jc = 0; 429 } else if (panfrost_exception_is_fault(js_status)) { 430 /* We might want to provide finer-grained error code based on 431 * the exception type, but unconditionally setting to EINVAL 432 * is good enough for now. 433 */ 434 dma_fence_set_error(job->done_fence, -EINVAL); 435 job->jc = 0; 436 } 437 438 panfrost_mmu_as_put(pfdev, job->file_priv->mmu); 439 panfrost_devfreq_record_idle(&pfdev->pfdevfreq); 440 441 if (signal_fence) 442 dma_fence_signal_locked(job->done_fence); 443 444 pm_runtime_put_autosuspend(pfdev->dev); 445 446 if (panfrost_exception_needs_reset(pfdev, js_status)) { 447 atomic_set(&pfdev->reset.pending, 1); 448 drm_sched_fault(&pfdev->js->queue[js].sched); 449 } 450 } 451 452 static void panfrost_job_handle_done(struct panfrost_device *pfdev, 453 struct panfrost_job *job) 454 { 455 /* Set ->jc to 0 to avoid re-submitting an already finished job (can 456 * happen when we receive the DONE interrupt while doing a GPU reset). 457 */ 458 job->jc = 0; 459 panfrost_mmu_as_put(pfdev, job->file_priv->mmu); 460 panfrost_devfreq_record_idle(&pfdev->pfdevfreq); 461 462 dma_fence_signal_locked(job->done_fence); 463 pm_runtime_put_autosuspend(pfdev->dev); 464 } 465 466 static void panfrost_job_handle_irq(struct panfrost_device *pfdev, u32 status) 467 { 468 struct panfrost_job *done[NUM_JOB_SLOTS][2] = {}; 469 struct panfrost_job *failed[NUM_JOB_SLOTS] = {}; 470 u32 js_state = 0, js_events = 0; 471 unsigned int i, j; 472 473 /* First we collect all failed/done jobs. */ 474 while (status) { 475 u32 js_state_mask = 0; 476 477 for (j = 0; j < NUM_JOB_SLOTS; j++) { 478 if (status & MK_JS_MASK(j)) 479 js_state_mask |= MK_JS_MASK(j); 480 481 if (status & JOB_INT_MASK_DONE(j)) { 482 if (done[j][0]) 483 done[j][1] = panfrost_dequeue_job(pfdev, j); 484 else 485 done[j][0] = panfrost_dequeue_job(pfdev, j); 486 } 487 488 if (status & JOB_INT_MASK_ERR(j)) { 489 /* Cancel the next submission. Will be submitted 490 * after we're done handling this failure if 491 * there's no reset pending. 492 */ 493 job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_NOP); 494 failed[j] = panfrost_dequeue_job(pfdev, j); 495 } 496 } 497 498 /* JS_STATE is sampled when JOB_INT_CLEAR is written. 499 * For each BIT(slot) or BIT(slot + 16) bit written to 500 * JOB_INT_CLEAR, the corresponding bits in JS_STATE 501 * (BIT(slot) and BIT(slot + 16)) are updated, but this 502 * is racy. If we only have one job done at the time we 503 * read JOB_INT_RAWSTAT but the second job fails before we 504 * clear the status, we end up with a status containing 505 * only the DONE bit and consider both jobs as DONE since 506 * JS_STATE reports both NEXT and CURRENT as inactive. 507 * To prevent that, let's repeat this clear+read steps 508 * until status is 0. 509 */ 510 job_write(pfdev, JOB_INT_CLEAR, status); 511 js_state &= ~js_state_mask; 512 js_state |= job_read(pfdev, JOB_INT_JS_STATE) & js_state_mask; 513 js_events |= status; 514 status = job_read(pfdev, JOB_INT_RAWSTAT); 515 } 516 517 /* Then we handle the dequeued jobs. */ 518 for (j = 0; j < NUM_JOB_SLOTS; j++) { 519 if (!(js_events & MK_JS_MASK(j))) 520 continue; 521 522 if (failed[j]) { 523 panfrost_job_handle_err(pfdev, failed[j], j); 524 } else if (pfdev->jobs[j][0] && !(js_state & MK_JS_MASK(j))) { 525 /* When the current job doesn't fail, the JM dequeues 526 * the next job without waiting for an ACK, this means 527 * we can have 2 jobs dequeued and only catch the 528 * interrupt when the second one is done. If both slots 529 * are inactive, but one job remains in pfdev->jobs[j], 530 * consider it done. Of course that doesn't apply if a 531 * failure happened since we cancelled execution of the 532 * job in _NEXT (see above). 533 */ 534 if (WARN_ON(!done[j][0])) 535 done[j][0] = panfrost_dequeue_job(pfdev, j); 536 else 537 done[j][1] = panfrost_dequeue_job(pfdev, j); 538 } 539 540 for (i = 0; i < ARRAY_SIZE(done[0]) && done[j][i]; i++) 541 panfrost_job_handle_done(pfdev, done[j][i]); 542 } 543 544 /* And finally we requeue jobs that were waiting in the second slot 545 * and have been stopped if we detected a failure on the first slot. 546 */ 547 for (j = 0; j < NUM_JOB_SLOTS; j++) { 548 if (!(js_events & MK_JS_MASK(j))) 549 continue; 550 551 if (!failed[j] || !pfdev->jobs[j][0]) 552 continue; 553 554 if (pfdev->jobs[j][0]->jc == 0) { 555 /* The job was cancelled, signal the fence now */ 556 struct panfrost_job *canceled = panfrost_dequeue_job(pfdev, j); 557 558 dma_fence_set_error(canceled->done_fence, -ECANCELED); 559 panfrost_job_handle_done(pfdev, canceled); 560 } else if (!atomic_read(&pfdev->reset.pending)) { 561 /* Requeue the job we removed if no reset is pending */ 562 job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_START); 563 } 564 } 565 } 566 567 static void panfrost_job_handle_irqs(struct panfrost_device *pfdev) 568 { 569 u32 status = job_read(pfdev, JOB_INT_RAWSTAT); 570 571 while (status) { 572 pm_runtime_mark_last_busy(pfdev->dev); 573 574 spin_lock(&pfdev->js->job_lock); 575 panfrost_job_handle_irq(pfdev, status); 576 spin_unlock(&pfdev->js->job_lock); 577 status = job_read(pfdev, JOB_INT_RAWSTAT); 578 } 579 } 580 581 static u32 panfrost_active_slots(struct panfrost_device *pfdev, 582 u32 *js_state_mask, u32 js_state) 583 { 584 u32 rawstat; 585 586 if (!(js_state & *js_state_mask)) 587 return 0; 588 589 rawstat = job_read(pfdev, JOB_INT_RAWSTAT); 590 if (rawstat) { 591 unsigned int i; 592 593 for (i = 0; i < NUM_JOB_SLOTS; i++) { 594 if (rawstat & MK_JS_MASK(i)) 595 *js_state_mask &= ~MK_JS_MASK(i); 596 } 597 } 598 599 return js_state & *js_state_mask; 600 } 601 602 static void 603 panfrost_reset(struct panfrost_device *pfdev, 604 struct drm_sched_job *bad) 605 { 606 u32 js_state, js_state_mask = 0xffffffff; 607 unsigned int i, j; 608 bool cookie; 609 int ret; 610 611 if (!atomic_read(&pfdev->reset.pending)) 612 return; 613 614 /* Stop the schedulers. 615 * 616 * FIXME: We temporarily get out of the dma_fence_signalling section 617 * because the cleanup path generate lockdep splats when taking locks 618 * to release job resources. We should rework the code to follow this 619 * pattern: 620 * 621 * try_lock 622 * if (locked) 623 * release 624 * else 625 * schedule_work_to_release_later 626 */ 627 for (i = 0; i < NUM_JOB_SLOTS; i++) 628 drm_sched_stop(&pfdev->js->queue[i].sched, bad); 629 630 cookie = dma_fence_begin_signalling(); 631 632 if (bad) 633 drm_sched_increase_karma(bad); 634 635 /* Mask job interrupts and synchronize to make sure we won't be 636 * interrupted during our reset. 637 */ 638 job_write(pfdev, JOB_INT_MASK, 0); 639 synchronize_irq(pfdev->js->irq); 640 641 for (i = 0; i < NUM_JOB_SLOTS; i++) { 642 /* Cancel the next job and soft-stop the running job. */ 643 job_write(pfdev, JS_COMMAND_NEXT(i), JS_COMMAND_NOP); 644 job_write(pfdev, JS_COMMAND(i), JS_COMMAND_SOFT_STOP); 645 } 646 647 /* Wait at most 10ms for soft-stops to complete */ 648 ret = readl_poll_timeout(pfdev->iomem + JOB_INT_JS_STATE, js_state, 649 !panfrost_active_slots(pfdev, &js_state_mask, js_state), 650 10, 10000); 651 652 if (ret) 653 dev_err(pfdev->dev, "Soft-stop failed\n"); 654 655 /* Handle the remaining interrupts before we reset. */ 656 panfrost_job_handle_irqs(pfdev); 657 658 /* Remaining interrupts have been handled, but we might still have 659 * stuck jobs. Let's make sure the PM counters stay balanced by 660 * manually calling pm_runtime_put_noidle() and 661 * panfrost_devfreq_record_idle() for each stuck job. 662 */ 663 spin_lock(&pfdev->js->job_lock); 664 for (i = 0; i < NUM_JOB_SLOTS; i++) { 665 for (j = 0; j < ARRAY_SIZE(pfdev->jobs[0]) && pfdev->jobs[i][j]; j++) { 666 pm_runtime_put_noidle(pfdev->dev); 667 panfrost_devfreq_record_idle(&pfdev->pfdevfreq); 668 } 669 } 670 memset(pfdev->jobs, 0, sizeof(pfdev->jobs)); 671 spin_unlock(&pfdev->js->job_lock); 672 673 /* Proceed with reset now. */ 674 panfrost_device_reset(pfdev); 675 676 /* panfrost_device_reset() unmasks job interrupts, but we want to 677 * keep them masked a bit longer. 678 */ 679 job_write(pfdev, JOB_INT_MASK, 0); 680 681 /* GPU has been reset, we can clear the reset pending bit. */ 682 atomic_set(&pfdev->reset.pending, 0); 683 684 /* Now resubmit jobs that were previously queued but didn't have a 685 * chance to finish. 686 * FIXME: We temporarily get out of the DMA fence signalling section 687 * while resubmitting jobs because the job submission logic will 688 * allocate memory with the GFP_KERNEL flag which can trigger memory 689 * reclaim and exposes a lock ordering issue. 690 */ 691 dma_fence_end_signalling(cookie); 692 for (i = 0; i < NUM_JOB_SLOTS; i++) 693 drm_sched_resubmit_jobs(&pfdev->js->queue[i].sched); 694 cookie = dma_fence_begin_signalling(); 695 696 /* Restart the schedulers */ 697 for (i = 0; i < NUM_JOB_SLOTS; i++) 698 drm_sched_start(&pfdev->js->queue[i].sched, true); 699 700 /* Re-enable job interrupts now that everything has been restarted. */ 701 job_write(pfdev, JOB_INT_MASK, 702 GENMASK(16 + NUM_JOB_SLOTS - 1, 16) | 703 GENMASK(NUM_JOB_SLOTS - 1, 0)); 704 705 dma_fence_end_signalling(cookie); 706 } 707 708 static enum drm_gpu_sched_stat panfrost_job_timedout(struct drm_sched_job 709 *sched_job) 710 { 711 struct panfrost_job *job = to_panfrost_job(sched_job); 712 struct panfrost_device *pfdev = job->pfdev; 713 int js = panfrost_job_get_slot(job); 714 715 /* 716 * If the GPU managed to complete this jobs fence, the timeout is 717 * spurious. Bail out. 718 */ 719 if (dma_fence_is_signaled(job->done_fence)) 720 return DRM_GPU_SCHED_STAT_NOMINAL; 721 722 dev_err(pfdev->dev, "gpu sched timeout, js=%d, config=0x%x, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p", 723 js, 724 job_read(pfdev, JS_CONFIG(js)), 725 job_read(pfdev, JS_STATUS(js)), 726 job_read(pfdev, JS_HEAD_LO(js)), 727 job_read(pfdev, JS_TAIL_LO(js)), 728 sched_job); 729 730 atomic_set(&pfdev->reset.pending, 1); 731 panfrost_reset(pfdev, sched_job); 732 733 return DRM_GPU_SCHED_STAT_NOMINAL; 734 } 735 736 static void panfrost_reset_work(struct work_struct *work) 737 { 738 struct panfrost_device *pfdev; 739 740 pfdev = container_of(work, struct panfrost_device, reset.work); 741 panfrost_reset(pfdev, NULL); 742 } 743 744 static const struct drm_sched_backend_ops panfrost_sched_ops = { 745 .run_job = panfrost_job_run, 746 .timedout_job = panfrost_job_timedout, 747 .free_job = panfrost_job_free 748 }; 749 750 static irqreturn_t panfrost_job_irq_handler_thread(int irq, void *data) 751 { 752 struct panfrost_device *pfdev = data; 753 754 panfrost_job_handle_irqs(pfdev); 755 job_write(pfdev, JOB_INT_MASK, 756 GENMASK(16 + NUM_JOB_SLOTS - 1, 16) | 757 GENMASK(NUM_JOB_SLOTS - 1, 0)); 758 return IRQ_HANDLED; 759 } 760 761 static irqreturn_t panfrost_job_irq_handler(int irq, void *data) 762 { 763 struct panfrost_device *pfdev = data; 764 u32 status = job_read(pfdev, JOB_INT_STAT); 765 766 if (!status) 767 return IRQ_NONE; 768 769 job_write(pfdev, JOB_INT_MASK, 0); 770 return IRQ_WAKE_THREAD; 771 } 772 773 int panfrost_job_init(struct panfrost_device *pfdev) 774 { 775 struct panfrost_job_slot *js; 776 unsigned int nentries = 2; 777 int ret, j; 778 779 /* All GPUs have two entries per queue, but without jobchain 780 * disambiguation stopping the right job in the close path is tricky, 781 * so let's just advertise one entry in that case. 782 */ 783 if (!panfrost_has_hw_feature(pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION)) 784 nentries = 1; 785 786 pfdev->js = js = devm_kzalloc(pfdev->dev, sizeof(*js), GFP_KERNEL); 787 if (!js) 788 return -ENOMEM; 789 790 INIT_WORK(&pfdev->reset.work, panfrost_reset_work); 791 spin_lock_init(&js->job_lock); 792 793 js->irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "job"); 794 if (js->irq <= 0) 795 return -ENODEV; 796 797 ret = devm_request_threaded_irq(pfdev->dev, js->irq, 798 panfrost_job_irq_handler, 799 panfrost_job_irq_handler_thread, 800 IRQF_SHARED, KBUILD_MODNAME "-job", 801 pfdev); 802 if (ret) { 803 dev_err(pfdev->dev, "failed to request job irq"); 804 return ret; 805 } 806 807 pfdev->reset.wq = alloc_ordered_workqueue("panfrost-reset", 0); 808 if (!pfdev->reset.wq) 809 return -ENOMEM; 810 811 for (j = 0; j < NUM_JOB_SLOTS; j++) { 812 js->queue[j].fence_context = dma_fence_context_alloc(1); 813 814 ret = drm_sched_init(&js->queue[j].sched, 815 &panfrost_sched_ops, 816 nentries, 0, 817 msecs_to_jiffies(JOB_TIMEOUT_MS), 818 pfdev->reset.wq, 819 NULL, "pan_js", pfdev->dev); 820 if (ret) { 821 dev_err(pfdev->dev, "Failed to create scheduler: %d.", ret); 822 goto err_sched; 823 } 824 } 825 826 panfrost_job_enable_interrupts(pfdev); 827 828 return 0; 829 830 err_sched: 831 for (j--; j >= 0; j--) 832 drm_sched_fini(&js->queue[j].sched); 833 834 destroy_workqueue(pfdev->reset.wq); 835 return ret; 836 } 837 838 void panfrost_job_fini(struct panfrost_device *pfdev) 839 { 840 struct panfrost_job_slot *js = pfdev->js; 841 int j; 842 843 job_write(pfdev, JOB_INT_MASK, 0); 844 845 for (j = 0; j < NUM_JOB_SLOTS; j++) { 846 drm_sched_fini(&js->queue[j].sched); 847 } 848 849 cancel_work_sync(&pfdev->reset.work); 850 destroy_workqueue(pfdev->reset.wq); 851 } 852 853 int panfrost_job_open(struct panfrost_file_priv *panfrost_priv) 854 { 855 struct panfrost_device *pfdev = panfrost_priv->pfdev; 856 struct panfrost_job_slot *js = pfdev->js; 857 struct drm_gpu_scheduler *sched; 858 int ret, i; 859 860 for (i = 0; i < NUM_JOB_SLOTS; i++) { 861 sched = &js->queue[i].sched; 862 ret = drm_sched_entity_init(&panfrost_priv->sched_entity[i], 863 DRM_SCHED_PRIORITY_NORMAL, &sched, 864 1, NULL); 865 if (WARN_ON(ret)) 866 return ret; 867 } 868 return 0; 869 } 870 871 void panfrost_job_close(struct panfrost_file_priv *panfrost_priv) 872 { 873 struct panfrost_device *pfdev = panfrost_priv->pfdev; 874 int i; 875 876 for (i = 0; i < NUM_JOB_SLOTS; i++) 877 drm_sched_entity_destroy(&panfrost_priv->sched_entity[i]); 878 879 /* Kill in-flight jobs */ 880 spin_lock(&pfdev->js->job_lock); 881 for (i = 0; i < NUM_JOB_SLOTS; i++) { 882 struct drm_sched_entity *entity = &panfrost_priv->sched_entity[i]; 883 int j; 884 885 for (j = ARRAY_SIZE(pfdev->jobs[0]) - 1; j >= 0; j--) { 886 struct panfrost_job *job = pfdev->jobs[i][j]; 887 u32 cmd; 888 889 if (!job || job->base.entity != entity) 890 continue; 891 892 if (j == 1) { 893 /* Try to cancel the job before it starts */ 894 job_write(pfdev, JS_COMMAND_NEXT(i), JS_COMMAND_NOP); 895 /* Reset the job head so it doesn't get restarted if 896 * the job in the first slot failed. 897 */ 898 job->jc = 0; 899 } 900 901 if (panfrost_has_hw_feature(pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION)) { 902 cmd = panfrost_get_job_chain_flag(job) ? 903 JS_COMMAND_HARD_STOP_1 : 904 JS_COMMAND_HARD_STOP_0; 905 } else { 906 cmd = JS_COMMAND_HARD_STOP; 907 } 908 909 job_write(pfdev, JS_COMMAND(i), cmd); 910 } 911 } 912 spin_unlock(&pfdev->js->job_lock); 913 } 914 915 int panfrost_job_is_idle(struct panfrost_device *pfdev) 916 { 917 struct panfrost_job_slot *js = pfdev->js; 918 int i; 919 920 for (i = 0; i < NUM_JOB_SLOTS; i++) { 921 /* If there are any jobs in the HW queue, we're not idle */ 922 if (atomic_read(&js->queue[i].sched.hw_rq_count)) 923 return false; 924 } 925 926 return true; 927 } 928