1 // SPDX-License-Identifier: GPL-2.0 OR MIT 2 /* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */ 3 4 #include <linux/iosys-map.h> 5 #include <linux/kthread.h> 6 #include <linux/slab.h> 7 #include <linux/vmalloc.h> 8 #include <linux/pm_runtime.h> 9 10 #include "lima_devfreq.h" 11 #include "lima_drv.h" 12 #include "lima_sched.h" 13 #include "lima_vm.h" 14 #include "lima_mmu.h" 15 #include "lima_l2_cache.h" 16 #include "lima_gem.h" 17 #include "lima_trace.h" 18 19 struct lima_fence { 20 struct dma_fence base; 21 struct lima_sched_pipe *pipe; 22 }; 23 24 static struct kmem_cache *lima_fence_slab; 25 static int lima_fence_slab_refcnt; 26 27 int lima_sched_slab_init(void) 28 { 29 if (!lima_fence_slab) { 30 lima_fence_slab = kmem_cache_create( 31 "lima_fence", sizeof(struct lima_fence), 0, 32 SLAB_HWCACHE_ALIGN, NULL); 33 if (!lima_fence_slab) 34 return -ENOMEM; 35 } 36 37 lima_fence_slab_refcnt++; 38 return 0; 39 } 40 41 void lima_sched_slab_fini(void) 42 { 43 if (!--lima_fence_slab_refcnt) { 44 kmem_cache_destroy(lima_fence_slab); 45 lima_fence_slab = NULL; 46 } 47 } 48 49 static inline struct lima_fence *to_lima_fence(struct dma_fence *fence) 50 { 51 return container_of(fence, struct lima_fence, base); 52 } 53 54 static const char *lima_fence_get_driver_name(struct dma_fence *fence) 55 { 56 return "lima"; 57 } 58 59 static const char *lima_fence_get_timeline_name(struct dma_fence *fence) 60 { 61 struct lima_fence *f = to_lima_fence(fence); 62 63 return f->pipe->base.name; 64 } 65 66 static void lima_fence_release_rcu(struct rcu_head *rcu) 67 { 68 struct dma_fence *f = container_of(rcu, struct dma_fence, rcu); 69 struct lima_fence *fence = to_lima_fence(f); 70 71 kmem_cache_free(lima_fence_slab, fence); 72 } 73 74 static void lima_fence_release(struct dma_fence *fence) 75 { 76 struct lima_fence *f = to_lima_fence(fence); 77 78 call_rcu(&f->base.rcu, lima_fence_release_rcu); 79 } 80 81 static const struct dma_fence_ops lima_fence_ops = { 82 .get_driver_name = lima_fence_get_driver_name, 83 .get_timeline_name = lima_fence_get_timeline_name, 84 .release = lima_fence_release, 85 }; 86 87 static struct lima_fence *lima_fence_create(struct lima_sched_pipe *pipe) 88 { 89 struct lima_fence *fence; 90 91 fence = kmem_cache_zalloc(lima_fence_slab, GFP_KERNEL); 92 if (!fence) 93 return NULL; 94 95 fence->pipe = pipe; 96 dma_fence_init(&fence->base, &lima_fence_ops, &pipe->fence_lock, 97 pipe->fence_context, ++pipe->fence_seqno); 98 99 return fence; 100 } 101 102 static inline struct lima_sched_task *to_lima_task(struct drm_sched_job *job) 103 { 104 return container_of(job, struct lima_sched_task, base); 105 } 106 107 static inline struct lima_sched_pipe *to_lima_pipe(struct drm_gpu_scheduler *sched) 108 { 109 return container_of(sched, struct lima_sched_pipe, base); 110 } 111 112 int lima_sched_task_init(struct lima_sched_task *task, 113 struct lima_sched_context *context, 114 struct lima_bo **bos, int num_bos, 115 struct lima_vm *vm) 116 { 117 int err, i; 118 119 task->bos = kmemdup(bos, sizeof(*bos) * num_bos, GFP_KERNEL); 120 if (!task->bos) 121 return -ENOMEM; 122 123 for (i = 0; i < num_bos; i++) 124 drm_gem_object_get(&bos[i]->base.base); 125 126 err = drm_sched_job_init(&task->base, &context->base, vm); 127 if (err) { 128 kfree(task->bos); 129 return err; 130 } 131 132 drm_sched_job_arm(&task->base); 133 134 task->num_bos = num_bos; 135 task->vm = lima_vm_get(vm); 136 137 return 0; 138 } 139 140 void lima_sched_task_fini(struct lima_sched_task *task) 141 { 142 int i; 143 144 drm_sched_job_cleanup(&task->base); 145 146 if (task->bos) { 147 for (i = 0; i < task->num_bos; i++) 148 drm_gem_object_put(&task->bos[i]->base.base); 149 kfree(task->bos); 150 } 151 152 lima_vm_put(task->vm); 153 } 154 155 int lima_sched_context_init(struct lima_sched_pipe *pipe, 156 struct lima_sched_context *context, 157 atomic_t *guilty) 158 { 159 struct drm_gpu_scheduler *sched = &pipe->base; 160 161 return drm_sched_entity_init(&context->base, DRM_SCHED_PRIORITY_NORMAL, 162 &sched, 1, guilty); 163 } 164 165 void lima_sched_context_fini(struct lima_sched_pipe *pipe, 166 struct lima_sched_context *context) 167 { 168 drm_sched_entity_fini(&context->base); 169 } 170 171 struct dma_fence *lima_sched_context_queue_task(struct lima_sched_task *task) 172 { 173 struct dma_fence *fence = dma_fence_get(&task->base.s_fence->finished); 174 175 trace_lima_task_submit(task); 176 drm_sched_entity_push_job(&task->base); 177 return fence; 178 } 179 180 static int lima_pm_busy(struct lima_device *ldev) 181 { 182 int ret; 183 184 /* resume GPU if it has been suspended by runtime PM */ 185 ret = pm_runtime_resume_and_get(ldev->dev); 186 if (ret < 0) 187 return ret; 188 189 lima_devfreq_record_busy(&ldev->devfreq); 190 return 0; 191 } 192 193 static void lima_pm_idle(struct lima_device *ldev) 194 { 195 lima_devfreq_record_idle(&ldev->devfreq); 196 197 /* GPU can do auto runtime suspend */ 198 pm_runtime_mark_last_busy(ldev->dev); 199 pm_runtime_put_autosuspend(ldev->dev); 200 } 201 202 static struct dma_fence *lima_sched_run_job(struct drm_sched_job *job) 203 { 204 struct lima_sched_task *task = to_lima_task(job); 205 struct lima_sched_pipe *pipe = to_lima_pipe(job->sched); 206 struct lima_device *ldev = pipe->ldev; 207 struct lima_fence *fence; 208 int i, err; 209 210 /* after GPU reset */ 211 if (job->s_fence->finished.error < 0) 212 return NULL; 213 214 fence = lima_fence_create(pipe); 215 if (!fence) 216 return NULL; 217 218 err = lima_pm_busy(ldev); 219 if (err < 0) { 220 dma_fence_put(&fence->base); 221 return NULL; 222 } 223 224 task->fence = &fence->base; 225 226 /* for caller usage of the fence, otherwise irq handler 227 * may consume the fence before caller use it 228 */ 229 dma_fence_get(task->fence); 230 231 pipe->current_task = task; 232 233 /* this is needed for MMU to work correctly, otherwise GP/PP 234 * will hang or page fault for unknown reason after running for 235 * a while. 236 * 237 * Need to investigate: 238 * 1. is it related to TLB 239 * 2. how much performance will be affected by L2 cache flush 240 * 3. can we reduce the calling of this function because all 241 * GP/PP use the same L2 cache on mali400 242 * 243 * TODO: 244 * 1. move this to task fini to save some wait time? 245 * 2. when GP/PP use different l2 cache, need PP wait GP l2 246 * cache flush? 247 */ 248 for (i = 0; i < pipe->num_l2_cache; i++) 249 lima_l2_cache_flush(pipe->l2_cache[i]); 250 251 lima_vm_put(pipe->current_vm); 252 pipe->current_vm = lima_vm_get(task->vm); 253 254 if (pipe->bcast_mmu) 255 lima_mmu_switch_vm(pipe->bcast_mmu, pipe->current_vm); 256 else { 257 for (i = 0; i < pipe->num_mmu; i++) 258 lima_mmu_switch_vm(pipe->mmu[i], pipe->current_vm); 259 } 260 261 trace_lima_task_run(task); 262 263 pipe->error = false; 264 pipe->task_run(pipe, task); 265 266 return task->fence; 267 } 268 269 static void lima_sched_build_error_task_list(struct lima_sched_task *task) 270 { 271 struct lima_sched_error_task *et; 272 struct lima_sched_pipe *pipe = to_lima_pipe(task->base.sched); 273 struct lima_ip *ip = pipe->processor[0]; 274 int pipe_id = ip->id == lima_ip_gp ? lima_pipe_gp : lima_pipe_pp; 275 struct lima_device *dev = ip->dev; 276 struct lima_sched_context *sched_ctx = 277 container_of(task->base.entity, 278 struct lima_sched_context, base); 279 struct lima_ctx *ctx = 280 container_of(sched_ctx, struct lima_ctx, context[pipe_id]); 281 struct lima_dump_task *dt; 282 struct lima_dump_chunk *chunk; 283 struct lima_dump_chunk_pid *pid_chunk; 284 struct lima_dump_chunk_buffer *buffer_chunk; 285 u32 size, task_size, mem_size; 286 int i; 287 struct iosys_map map; 288 int ret; 289 290 mutex_lock(&dev->error_task_list_lock); 291 292 if (dev->dump.num_tasks >= lima_max_error_tasks) { 293 dev_info(dev->dev, "fail to save task state from %s pid %d: " 294 "error task list is full\n", ctx->pname, ctx->pid); 295 goto out; 296 } 297 298 /* frame chunk */ 299 size = sizeof(struct lima_dump_chunk) + pipe->frame_size; 300 /* process name chunk */ 301 size += sizeof(struct lima_dump_chunk) + sizeof(ctx->pname); 302 /* pid chunk */ 303 size += sizeof(struct lima_dump_chunk); 304 /* buffer chunks */ 305 for (i = 0; i < task->num_bos; i++) { 306 struct lima_bo *bo = task->bos[i]; 307 308 size += sizeof(struct lima_dump_chunk); 309 size += bo->heap_size ? bo->heap_size : lima_bo_size(bo); 310 } 311 312 task_size = size + sizeof(struct lima_dump_task); 313 mem_size = task_size + sizeof(*et); 314 et = kvmalloc(mem_size, GFP_KERNEL); 315 if (!et) { 316 dev_err(dev->dev, "fail to alloc task dump buffer of size %x\n", 317 mem_size); 318 goto out; 319 } 320 321 et->data = et + 1; 322 et->size = task_size; 323 324 dt = et->data; 325 memset(dt, 0, sizeof(*dt)); 326 dt->id = pipe_id; 327 dt->size = size; 328 329 chunk = (struct lima_dump_chunk *)(dt + 1); 330 memset(chunk, 0, sizeof(*chunk)); 331 chunk->id = LIMA_DUMP_CHUNK_FRAME; 332 chunk->size = pipe->frame_size; 333 memcpy(chunk + 1, task->frame, pipe->frame_size); 334 dt->num_chunks++; 335 336 chunk = (void *)(chunk + 1) + chunk->size; 337 memset(chunk, 0, sizeof(*chunk)); 338 chunk->id = LIMA_DUMP_CHUNK_PROCESS_NAME; 339 chunk->size = sizeof(ctx->pname); 340 memcpy(chunk + 1, ctx->pname, sizeof(ctx->pname)); 341 dt->num_chunks++; 342 343 pid_chunk = (void *)(chunk + 1) + chunk->size; 344 memset(pid_chunk, 0, sizeof(*pid_chunk)); 345 pid_chunk->id = LIMA_DUMP_CHUNK_PROCESS_ID; 346 pid_chunk->pid = ctx->pid; 347 dt->num_chunks++; 348 349 buffer_chunk = (void *)(pid_chunk + 1) + pid_chunk->size; 350 for (i = 0; i < task->num_bos; i++) { 351 struct lima_bo *bo = task->bos[i]; 352 void *data; 353 354 memset(buffer_chunk, 0, sizeof(*buffer_chunk)); 355 buffer_chunk->id = LIMA_DUMP_CHUNK_BUFFER; 356 buffer_chunk->va = lima_vm_get_va(task->vm, bo); 357 358 if (bo->heap_size) { 359 buffer_chunk->size = bo->heap_size; 360 361 data = vmap(bo->base.pages, bo->heap_size >> PAGE_SHIFT, 362 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 363 if (!data) { 364 kvfree(et); 365 goto out; 366 } 367 368 memcpy(buffer_chunk + 1, data, buffer_chunk->size); 369 370 vunmap(data); 371 } else { 372 buffer_chunk->size = lima_bo_size(bo); 373 374 ret = drm_gem_vmap_unlocked(&bo->base.base, &map); 375 if (ret) { 376 kvfree(et); 377 goto out; 378 } 379 380 memcpy(buffer_chunk + 1, map.vaddr, buffer_chunk->size); 381 382 drm_gem_vunmap_unlocked(&bo->base.base, &map); 383 } 384 385 buffer_chunk = (void *)(buffer_chunk + 1) + buffer_chunk->size; 386 dt->num_chunks++; 387 } 388 389 list_add(&et->list, &dev->error_task_list); 390 dev->dump.size += et->size; 391 dev->dump.num_tasks++; 392 393 dev_info(dev->dev, "save error task state success\n"); 394 395 out: 396 mutex_unlock(&dev->error_task_list_lock); 397 } 398 399 static enum drm_gpu_sched_stat lima_sched_timedout_job(struct drm_sched_job *job) 400 { 401 struct lima_sched_pipe *pipe = to_lima_pipe(job->sched); 402 struct lima_sched_task *task = to_lima_task(job); 403 struct lima_device *ldev = pipe->ldev; 404 405 if (!pipe->error) 406 DRM_ERROR("lima job timeout\n"); 407 408 drm_sched_stop(&pipe->base, &task->base); 409 410 drm_sched_increase_karma(&task->base); 411 412 if (lima_max_error_tasks) 413 lima_sched_build_error_task_list(task); 414 415 pipe->task_error(pipe); 416 417 if (pipe->bcast_mmu) 418 lima_mmu_page_fault_resume(pipe->bcast_mmu); 419 else { 420 int i; 421 422 for (i = 0; i < pipe->num_mmu; i++) 423 lima_mmu_page_fault_resume(pipe->mmu[i]); 424 } 425 426 lima_vm_put(pipe->current_vm); 427 pipe->current_vm = NULL; 428 pipe->current_task = NULL; 429 430 lima_pm_idle(ldev); 431 432 drm_sched_resubmit_jobs(&pipe->base); 433 drm_sched_start(&pipe->base, true); 434 435 return DRM_GPU_SCHED_STAT_NOMINAL; 436 } 437 438 static void lima_sched_free_job(struct drm_sched_job *job) 439 { 440 struct lima_sched_task *task = to_lima_task(job); 441 struct lima_sched_pipe *pipe = to_lima_pipe(job->sched); 442 struct lima_vm *vm = task->vm; 443 struct lima_bo **bos = task->bos; 444 int i; 445 446 dma_fence_put(task->fence); 447 448 for (i = 0; i < task->num_bos; i++) 449 lima_vm_bo_del(vm, bos[i]); 450 451 lima_sched_task_fini(task); 452 kmem_cache_free(pipe->task_slab, task); 453 } 454 455 static const struct drm_sched_backend_ops lima_sched_ops = { 456 .run_job = lima_sched_run_job, 457 .timedout_job = lima_sched_timedout_job, 458 .free_job = lima_sched_free_job, 459 }; 460 461 static void lima_sched_recover_work(struct work_struct *work) 462 { 463 struct lima_sched_pipe *pipe = 464 container_of(work, struct lima_sched_pipe, recover_work); 465 int i; 466 467 for (i = 0; i < pipe->num_l2_cache; i++) 468 lima_l2_cache_flush(pipe->l2_cache[i]); 469 470 if (pipe->bcast_mmu) { 471 lima_mmu_flush_tlb(pipe->bcast_mmu); 472 } else { 473 for (i = 0; i < pipe->num_mmu; i++) 474 lima_mmu_flush_tlb(pipe->mmu[i]); 475 } 476 477 if (pipe->task_recover(pipe)) 478 drm_sched_fault(&pipe->base); 479 } 480 481 int lima_sched_pipe_init(struct lima_sched_pipe *pipe, const char *name) 482 { 483 unsigned int timeout = lima_sched_timeout_ms > 0 ? 484 lima_sched_timeout_ms : 500; 485 486 pipe->fence_context = dma_fence_context_alloc(1); 487 spin_lock_init(&pipe->fence_lock); 488 489 INIT_WORK(&pipe->recover_work, lima_sched_recover_work); 490 491 return drm_sched_init(&pipe->base, &lima_sched_ops, 1, 492 lima_job_hang_limit, 493 msecs_to_jiffies(timeout), NULL, 494 NULL, name, pipe->ldev->dev); 495 } 496 497 void lima_sched_pipe_fini(struct lima_sched_pipe *pipe) 498 { 499 drm_sched_fini(&pipe->base); 500 } 501 502 void lima_sched_pipe_task_done(struct lima_sched_pipe *pipe) 503 { 504 struct lima_sched_task *task = pipe->current_task; 505 struct lima_device *ldev = pipe->ldev; 506 507 if (pipe->error) { 508 if (task && task->recoverable) 509 schedule_work(&pipe->recover_work); 510 else 511 drm_sched_fault(&pipe->base); 512 } else { 513 pipe->task_fini(pipe); 514 dma_fence_signal(task->fence); 515 516 lima_pm_idle(ldev); 517 } 518 } 519