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 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] = dma_resv_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 dma_resv_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 mutex_lock(&pfdev->reset_lock); 388 389 for (i = 0; i < NUM_JOB_SLOTS; i++) 390 drm_sched_stop(&pfdev->js->queue[i].sched, sched_job); 391 392 if (sched_job) 393 drm_sched_increase_karma(sched_job); 394 395 /* panfrost_core_dump(pfdev); */ 396 397 panfrost_devfreq_record_transition(pfdev, js); 398 panfrost_device_reset(pfdev); 399 400 for (i = 0; i < NUM_JOB_SLOTS; i++) 401 drm_sched_resubmit_jobs(&pfdev->js->queue[i].sched); 402 403 /* restart scheduler after GPU is usable again */ 404 for (i = 0; i < NUM_JOB_SLOTS; i++) 405 drm_sched_start(&pfdev->js->queue[i].sched, true); 406 407 mutex_unlock(&pfdev->reset_lock); 408 } 409 410 static const struct drm_sched_backend_ops panfrost_sched_ops = { 411 .dependency = panfrost_job_dependency, 412 .run_job = panfrost_job_run, 413 .timedout_job = panfrost_job_timedout, 414 .free_job = panfrost_job_free 415 }; 416 417 static irqreturn_t panfrost_job_irq_handler(int irq, void *data) 418 { 419 struct panfrost_device *pfdev = data; 420 u32 status = job_read(pfdev, JOB_INT_STAT); 421 int j; 422 423 dev_dbg(pfdev->dev, "jobslot irq status=%x\n", status); 424 425 if (!status) 426 return IRQ_NONE; 427 428 pm_runtime_mark_last_busy(pfdev->dev); 429 430 for (j = 0; status; j++) { 431 u32 mask = MK_JS_MASK(j); 432 433 if (!(status & mask)) 434 continue; 435 436 job_write(pfdev, JOB_INT_CLEAR, mask); 437 438 if (status & JOB_INT_MASK_ERR(j)) { 439 job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_NOP); 440 441 dev_err(pfdev->dev, "js fault, js=%d, status=%s, head=0x%x, tail=0x%x", 442 j, 443 panfrost_exception_name(pfdev, job_read(pfdev, JS_STATUS(j))), 444 job_read(pfdev, JS_HEAD_LO(j)), 445 job_read(pfdev, JS_TAIL_LO(j))); 446 447 drm_sched_fault(&pfdev->js->queue[j].sched); 448 } 449 450 if (status & JOB_INT_MASK_DONE(j)) { 451 panfrost_devfreq_record_transition(pfdev, j); 452 dma_fence_signal(pfdev->jobs[j]->done_fence); 453 } 454 455 status &= ~mask; 456 } 457 458 return IRQ_HANDLED; 459 } 460 461 int panfrost_job_init(struct panfrost_device *pfdev) 462 { 463 struct panfrost_job_slot *js; 464 int ret, j, irq; 465 466 pfdev->js = js = devm_kzalloc(pfdev->dev, sizeof(*js), GFP_KERNEL); 467 if (!js) 468 return -ENOMEM; 469 470 spin_lock_init(&js->job_lock); 471 472 irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "job"); 473 if (irq <= 0) 474 return -ENODEV; 475 476 ret = devm_request_irq(pfdev->dev, irq, panfrost_job_irq_handler, 477 IRQF_SHARED, "job", pfdev); 478 if (ret) { 479 dev_err(pfdev->dev, "failed to request job irq"); 480 return ret; 481 } 482 483 for (j = 0; j < NUM_JOB_SLOTS; j++) { 484 js->queue[j].fence_context = dma_fence_context_alloc(1); 485 486 ret = drm_sched_init(&js->queue[j].sched, 487 &panfrost_sched_ops, 488 1, 0, msecs_to_jiffies(500), 489 "pan_js"); 490 if (ret) { 491 dev_err(pfdev->dev, "Failed to create scheduler: %d.", ret); 492 goto err_sched; 493 } 494 } 495 496 panfrost_job_enable_interrupts(pfdev); 497 498 return 0; 499 500 err_sched: 501 for (j--; j >= 0; j--) 502 drm_sched_fini(&js->queue[j].sched); 503 504 return ret; 505 } 506 507 void panfrost_job_fini(struct panfrost_device *pfdev) 508 { 509 struct panfrost_job_slot *js = pfdev->js; 510 int j; 511 512 job_write(pfdev, JOB_INT_MASK, 0); 513 514 for (j = 0; j < NUM_JOB_SLOTS; j++) 515 drm_sched_fini(&js->queue[j].sched); 516 517 } 518 519 int panfrost_job_open(struct panfrost_file_priv *panfrost_priv) 520 { 521 struct panfrost_device *pfdev = panfrost_priv->pfdev; 522 struct panfrost_job_slot *js = pfdev->js; 523 struct drm_sched_rq *rq; 524 int ret, i; 525 526 for (i = 0; i < NUM_JOB_SLOTS; i++) { 527 rq = &js->queue[i].sched.sched_rq[DRM_SCHED_PRIORITY_NORMAL]; 528 ret = drm_sched_entity_init(&panfrost_priv->sched_entity[i], &rq, 1, NULL); 529 if (WARN_ON(ret)) 530 return ret; 531 } 532 return 0; 533 } 534 535 void panfrost_job_close(struct panfrost_file_priv *panfrost_priv) 536 { 537 int i; 538 539 for (i = 0; i < NUM_JOB_SLOTS; i++) 540 drm_sched_entity_destroy(&panfrost_priv->sched_entity[i]); 541 } 542 543 int panfrost_job_is_idle(struct panfrost_device *pfdev) 544 { 545 struct panfrost_job_slot *js = pfdev->js; 546 int i; 547 548 for (i = 0; i < NUM_JOB_SLOTS; i++) { 549 /* If there are any jobs in the HW queue, we're not idle */ 550 if (atomic_read(&js->queue[i].sched.hw_rq_count)) 551 return false; 552 553 /* Check whether the hardware is idle */ 554 if (pfdev->devfreq.slot[i].busy) 555 return false; 556 } 557 558 return true; 559 } 560