1// SPDX-License-Identifier: GPL-2.0 OR MIT 2/* 3 * Copyright 2014-2022 Advanced Micro Devices, Inc. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be included in 13 * all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 21 * OTHER DEALINGS IN THE SOFTWARE. 22 */ 23 24#include <linux/mutex.h> 25#include <linux/log2.h> 26#include <linux/sched.h> 27#include <linux/sched/mm.h> 28#include <linux/sched/task.h> 29#include <linux/mmu_context.h> 30#include <linux/slab.h> 31#include <linux/notifier.h> 32#include <linux/compat.h> 33#include <linux/mman.h> 34#include <linux/file.h> 35#include <linux/pm_runtime.h> 36#include "amdgpu_amdkfd.h" 37#include "amdgpu.h" 38 39struct mm_struct; 40 41#include "kfd_priv.h" 42#include "kfd_device_queue_manager.h" 43#include "kfd_svm.h" 44#include "kfd_smi_events.h" 45#include "kfd_debug.h" 46 47/* 48 * List of struct kfd_process (field kfd_process). 49 * Unique/indexed by mm_struct* 50 */ 51DEFINE_HASHTABLE(kfd_processes_table, KFD_PROCESS_TABLE_SIZE); 52DEFINE_MUTEX(kfd_processes_mutex); 53 54DEFINE_SRCU(kfd_processes_srcu); 55 56/* For process termination handling */ 57static struct workqueue_struct *kfd_process_wq; 58 59/* Ordered, single-threaded workqueue for restoring evicted 60 * processes. Restoring multiple processes concurrently under memory 61 * pressure can lead to processes blocking each other from validating 62 * their BOs and result in a live-lock situation where processes 63 * remain evicted indefinitely. 64 */ 65static struct workqueue_struct *kfd_restore_wq; 66 67static struct kfd_process *find_process(const struct task_struct *thread, 68 bool ref); 69static void kfd_process_ref_release(struct kref *ref); 70static struct kfd_process *create_process(const struct task_struct *thread); 71 72static void evict_process_worker(struct work_struct *work); 73static void restore_process_worker(struct work_struct *work); 74 75static void kfd_process_device_destroy_cwsr_dgpu(struct kfd_process_device *pdd); 76 77struct kfd_procfs_tree { 78 struct kobject *kobj; 79}; 80 81static struct kfd_procfs_tree procfs; 82 83/* 84 * Structure for SDMA activity tracking 85 */ 86struct kfd_sdma_activity_handler_workarea { 87 struct work_struct sdma_activity_work; 88 struct kfd_process_device *pdd; 89 uint64_t sdma_activity_counter; 90}; 91 92struct temp_sdma_queue_list { 93 uint64_t __user *rptr; 94 uint64_t sdma_val; 95 unsigned int queue_id; 96 struct list_head list; 97}; 98 99static void kfd_sdma_activity_worker(struct work_struct *work) 100{ 101 struct kfd_sdma_activity_handler_workarea *workarea; 102 struct kfd_process_device *pdd; 103 uint64_t val; 104 struct mm_struct *mm; 105 struct queue *q; 106 struct qcm_process_device *qpd; 107 struct device_queue_manager *dqm; 108 int ret = 0; 109 struct temp_sdma_queue_list sdma_q_list; 110 struct temp_sdma_queue_list *sdma_q, *next; 111 112 workarea = container_of(work, struct kfd_sdma_activity_handler_workarea, 113 sdma_activity_work); 114 115 pdd = workarea->pdd; 116 if (!pdd) 117 return; 118 dqm = pdd->dev->dqm; 119 qpd = &pdd->qpd; 120 if (!dqm || !qpd) 121 return; 122 /* 123 * Total SDMA activity is current SDMA activity + past SDMA activity 124 * Past SDMA count is stored in pdd. 125 * To get the current activity counters for all active SDMA queues, 126 * we loop over all SDMA queues and get their counts from user-space. 127 * 128 * We cannot call get_user() with dqm_lock held as it can cause 129 * a circular lock dependency situation. To read the SDMA stats, 130 * we need to do the following: 131 * 132 * 1. Create a temporary list of SDMA queue nodes from the qpd->queues_list, 133 * with dqm_lock/dqm_unlock(). 134 * 2. Call get_user() for each node in temporary list without dqm_lock. 135 * Save the SDMA count for each node and also add the count to the total 136 * SDMA count counter. 137 * Its possible, during this step, a few SDMA queue nodes got deleted 138 * from the qpd->queues_list. 139 * 3. Do a second pass over qpd->queues_list to check if any nodes got deleted. 140 * If any node got deleted, its SDMA count would be captured in the sdma 141 * past activity counter. So subtract the SDMA counter stored in step 2 142 * for this node from the total SDMA count. 143 */ 144 INIT_LIST_HEAD(&sdma_q_list.list); 145 146 /* 147 * Create the temp list of all SDMA queues 148 */ 149 dqm_lock(dqm); 150 151 list_for_each_entry(q, &qpd->queues_list, list) { 152 if ((q->properties.type != KFD_QUEUE_TYPE_SDMA) && 153 (q->properties.type != KFD_QUEUE_TYPE_SDMA_XGMI)) 154 continue; 155 156 sdma_q = kzalloc(sizeof(struct temp_sdma_queue_list), GFP_KERNEL); 157 if (!sdma_q) { 158 dqm_unlock(dqm); 159 goto cleanup; 160 } 161 162 INIT_LIST_HEAD(&sdma_q->list); 163 sdma_q->rptr = (uint64_t __user *)q->properties.read_ptr; 164 sdma_q->queue_id = q->properties.queue_id; 165 list_add_tail(&sdma_q->list, &sdma_q_list.list); 166 } 167 168 /* 169 * If the temp list is empty, then no SDMA queues nodes were found in 170 * qpd->queues_list. Return the past activity count as the total sdma 171 * count 172 */ 173 if (list_empty(&sdma_q_list.list)) { 174 workarea->sdma_activity_counter = pdd->sdma_past_activity_counter; 175 dqm_unlock(dqm); 176 return; 177 } 178 179 dqm_unlock(dqm); 180 181 /* 182 * Get the usage count for each SDMA queue in temp_list. 183 */ 184 mm = get_task_mm(pdd->process->lead_thread); 185 if (!mm) 186 goto cleanup; 187 188 kthread_use_mm(mm); 189 190 list_for_each_entry(sdma_q, &sdma_q_list.list, list) { 191 val = 0; 192 ret = read_sdma_queue_counter(sdma_q->rptr, &val); 193 if (ret) { 194 pr_debug("Failed to read SDMA queue active counter for queue id: %d", 195 sdma_q->queue_id); 196 } else { 197 sdma_q->sdma_val = val; 198 workarea->sdma_activity_counter += val; 199 } 200 } 201 202 kthread_unuse_mm(mm); 203 mmput(mm); 204 205 /* 206 * Do a second iteration over qpd_queues_list to check if any SDMA 207 * nodes got deleted while fetching SDMA counter. 208 */ 209 dqm_lock(dqm); 210 211 workarea->sdma_activity_counter += pdd->sdma_past_activity_counter; 212 213 list_for_each_entry(q, &qpd->queues_list, list) { 214 if (list_empty(&sdma_q_list.list)) 215 break; 216 217 if ((q->properties.type != KFD_QUEUE_TYPE_SDMA) && 218 (q->properties.type != KFD_QUEUE_TYPE_SDMA_XGMI)) 219 continue; 220 221 list_for_each_entry_safe(sdma_q, next, &sdma_q_list.list, list) { 222 if (((uint64_t __user *)q->properties.read_ptr == sdma_q->rptr) && 223 (sdma_q->queue_id == q->properties.queue_id)) { 224 list_del(&sdma_q->list); 225 kfree(sdma_q); 226 break; 227 } 228 } 229 } 230 231 dqm_unlock(dqm); 232 233 /* 234 * If temp list is not empty, it implies some queues got deleted 235 * from qpd->queues_list during SDMA usage read. Subtract the SDMA 236 * count for each node from the total SDMA count. 237 */ 238 list_for_each_entry_safe(sdma_q, next, &sdma_q_list.list, list) { 239 workarea->sdma_activity_counter -= sdma_q->sdma_val; 240 list_del(&sdma_q->list); 241 kfree(sdma_q); 242 } 243 244 return; 245 246cleanup: 247 list_for_each_entry_safe(sdma_q, next, &sdma_q_list.list, list) { 248 list_del(&sdma_q->list); 249 kfree(sdma_q); 250 } 251} 252 253/** 254 * kfd_get_cu_occupancy - Collect number of waves in-flight on this device 255 * by current process. Translates acquired wave count into number of compute units 256 * that are occupied. 257 * 258 * @attr: Handle of attribute that allows reporting of wave count. The attribute 259 * handle encapsulates GPU device it is associated with, thereby allowing collection 260 * of waves in flight, etc 261 * @buffer: Handle of user provided buffer updated with wave count 262 * 263 * Return: Number of bytes written to user buffer or an error value 264 */ 265static int kfd_get_cu_occupancy(struct attribute *attr, char *buffer) 266{ 267 int cu_cnt; 268 int wave_cnt; 269 int max_waves_per_cu; 270 struct kfd_node *dev = NULL; 271 struct kfd_process *proc = NULL; 272 struct kfd_process_device *pdd = NULL; 273 274 pdd = container_of(attr, struct kfd_process_device, attr_cu_occupancy); 275 dev = pdd->dev; 276 if (dev->kfd2kgd->get_cu_occupancy == NULL) 277 return -EINVAL; 278 279 cu_cnt = 0; 280 proc = pdd->process; 281 if (pdd->qpd.queue_count == 0) { 282 pr_debug("Gpu-Id: %d has no active queues for process %d\n", 283 dev->id, proc->pasid); 284 return snprintf(buffer, PAGE_SIZE, "%d\n", cu_cnt); 285 } 286 287 /* Collect wave count from device if it supports */ 288 wave_cnt = 0; 289 max_waves_per_cu = 0; 290 dev->kfd2kgd->get_cu_occupancy(dev->adev, proc->pasid, &wave_cnt, 291 &max_waves_per_cu, 0); 292 293 /* Translate wave count to number of compute units */ 294 cu_cnt = (wave_cnt + (max_waves_per_cu - 1)) / max_waves_per_cu; 295 return snprintf(buffer, PAGE_SIZE, "%d\n", cu_cnt); 296} 297 298static ssize_t kfd_procfs_show(struct kobject *kobj, struct attribute *attr, 299 char *buffer) 300{ 301 if (strcmp(attr->name, "pasid") == 0) { 302 struct kfd_process *p = container_of(attr, struct kfd_process, 303 attr_pasid); 304 305 return snprintf(buffer, PAGE_SIZE, "%d\n", p->pasid); 306 } else if (strncmp(attr->name, "vram_", 5) == 0) { 307 struct kfd_process_device *pdd = container_of(attr, struct kfd_process_device, 308 attr_vram); 309 return snprintf(buffer, PAGE_SIZE, "%llu\n", READ_ONCE(pdd->vram_usage)); 310 } else if (strncmp(attr->name, "sdma_", 5) == 0) { 311 struct kfd_process_device *pdd = container_of(attr, struct kfd_process_device, 312 attr_sdma); 313 struct kfd_sdma_activity_handler_workarea sdma_activity_work_handler; 314 315 INIT_WORK(&sdma_activity_work_handler.sdma_activity_work, 316 kfd_sdma_activity_worker); 317 318 sdma_activity_work_handler.pdd = pdd; 319 sdma_activity_work_handler.sdma_activity_counter = 0; 320 321 schedule_work(&sdma_activity_work_handler.sdma_activity_work); 322 323 flush_work(&sdma_activity_work_handler.sdma_activity_work); 324 325 return snprintf(buffer, PAGE_SIZE, "%llu\n", 326 (sdma_activity_work_handler.sdma_activity_counter)/ 327 SDMA_ACTIVITY_DIVISOR); 328 } else { 329 pr_err("Invalid attribute"); 330 return -EINVAL; 331 } 332 333 return 0; 334} 335 336static void kfd_procfs_kobj_release(struct kobject *kobj) 337{ 338 kfree(kobj); 339} 340 341static const struct sysfs_ops kfd_procfs_ops = { 342 .show = kfd_procfs_show, 343}; 344 345static const struct kobj_type procfs_type = { 346 .release = kfd_procfs_kobj_release, 347 .sysfs_ops = &kfd_procfs_ops, 348}; 349 350void kfd_procfs_init(void) 351{ 352 int ret = 0; 353 354 procfs.kobj = kfd_alloc_struct(procfs.kobj); 355 if (!procfs.kobj) 356 return; 357 358 ret = kobject_init_and_add(procfs.kobj, &procfs_type, 359 &kfd_device->kobj, "proc"); 360 if (ret) { 361 pr_warn("Could not create procfs proc folder"); 362 /* If we fail to create the procfs, clean up */ 363 kfd_procfs_shutdown(); 364 } 365} 366 367void kfd_procfs_shutdown(void) 368{ 369 if (procfs.kobj) { 370 kobject_del(procfs.kobj); 371 kobject_put(procfs.kobj); 372 procfs.kobj = NULL; 373 } 374} 375 376static ssize_t kfd_procfs_queue_show(struct kobject *kobj, 377 struct attribute *attr, char *buffer) 378{ 379 struct queue *q = container_of(kobj, struct queue, kobj); 380 381 if (!strcmp(attr->name, "size")) 382 return snprintf(buffer, PAGE_SIZE, "%llu", 383 q->properties.queue_size); 384 else if (!strcmp(attr->name, "type")) 385 return snprintf(buffer, PAGE_SIZE, "%d", q->properties.type); 386 else if (!strcmp(attr->name, "gpuid")) 387 return snprintf(buffer, PAGE_SIZE, "%u", q->device->id); 388 else 389 pr_err("Invalid attribute"); 390 391 return 0; 392} 393 394static ssize_t kfd_procfs_stats_show(struct kobject *kobj, 395 struct attribute *attr, char *buffer) 396{ 397 if (strcmp(attr->name, "evicted_ms") == 0) { 398 struct kfd_process_device *pdd = container_of(attr, 399 struct kfd_process_device, 400 attr_evict); 401 uint64_t evict_jiffies; 402 403 evict_jiffies = atomic64_read(&pdd->evict_duration_counter); 404 405 return snprintf(buffer, 406 PAGE_SIZE, 407 "%llu\n", 408 jiffies64_to_msecs(evict_jiffies)); 409 410 /* Sysfs handle that gets CU occupancy is per device */ 411 } else if (strcmp(attr->name, "cu_occupancy") == 0) { 412 return kfd_get_cu_occupancy(attr, buffer); 413 } else { 414 pr_err("Invalid attribute"); 415 } 416 417 return 0; 418} 419 420static ssize_t kfd_sysfs_counters_show(struct kobject *kobj, 421 struct attribute *attr, char *buf) 422{ 423 struct kfd_process_device *pdd; 424 425 if (!strcmp(attr->name, "faults")) { 426 pdd = container_of(attr, struct kfd_process_device, 427 attr_faults); 428 return sysfs_emit(buf, "%llu\n", READ_ONCE(pdd->faults)); 429 } 430 if (!strcmp(attr->name, "page_in")) { 431 pdd = container_of(attr, struct kfd_process_device, 432 attr_page_in); 433 return sysfs_emit(buf, "%llu\n", READ_ONCE(pdd->page_in)); 434 } 435 if (!strcmp(attr->name, "page_out")) { 436 pdd = container_of(attr, struct kfd_process_device, 437 attr_page_out); 438 return sysfs_emit(buf, "%llu\n", READ_ONCE(pdd->page_out)); 439 } 440 return 0; 441} 442 443static struct attribute attr_queue_size = { 444 .name = "size", 445 .mode = KFD_SYSFS_FILE_MODE 446}; 447 448static struct attribute attr_queue_type = { 449 .name = "type", 450 .mode = KFD_SYSFS_FILE_MODE 451}; 452 453static struct attribute attr_queue_gpuid = { 454 .name = "gpuid", 455 .mode = KFD_SYSFS_FILE_MODE 456}; 457 458static struct attribute *procfs_queue_attrs[] = { 459 &attr_queue_size, 460 &attr_queue_type, 461 &attr_queue_gpuid, 462 NULL 463}; 464ATTRIBUTE_GROUPS(procfs_queue); 465 466static const struct sysfs_ops procfs_queue_ops = { 467 .show = kfd_procfs_queue_show, 468}; 469 470static const struct kobj_type procfs_queue_type = { 471 .sysfs_ops = &procfs_queue_ops, 472 .default_groups = procfs_queue_groups, 473}; 474 475static const struct sysfs_ops procfs_stats_ops = { 476 .show = kfd_procfs_stats_show, 477}; 478 479static const struct kobj_type procfs_stats_type = { 480 .sysfs_ops = &procfs_stats_ops, 481 .release = kfd_procfs_kobj_release, 482}; 483 484static const struct sysfs_ops sysfs_counters_ops = { 485 .show = kfd_sysfs_counters_show, 486}; 487 488static const struct kobj_type sysfs_counters_type = { 489 .sysfs_ops = &sysfs_counters_ops, 490 .release = kfd_procfs_kobj_release, 491}; 492 493int kfd_procfs_add_queue(struct queue *q) 494{ 495 struct kfd_process *proc; 496 int ret; 497 498 if (!q || !q->process) 499 return -EINVAL; 500 proc = q->process; 501 502 /* Create proc/<pid>/queues/<queue id> folder */ 503 if (!proc->kobj_queues) 504 return -EFAULT; 505 ret = kobject_init_and_add(&q->kobj, &procfs_queue_type, 506 proc->kobj_queues, "%u", q->properties.queue_id); 507 if (ret < 0) { 508 pr_warn("Creating proc/<pid>/queues/%u failed", 509 q->properties.queue_id); 510 kobject_put(&q->kobj); 511 return ret; 512 } 513 514 return 0; 515} 516 517static void kfd_sysfs_create_file(struct kobject *kobj, struct attribute *attr, 518 char *name) 519{ 520 int ret; 521 522 if (!kobj || !attr || !name) 523 return; 524 525 attr->name = name; 526 attr->mode = KFD_SYSFS_FILE_MODE; 527 sysfs_attr_init(attr); 528 529 ret = sysfs_create_file(kobj, attr); 530 if (ret) 531 pr_warn("Create sysfs %s/%s failed %d", kobj->name, name, ret); 532} 533 534static void kfd_procfs_add_sysfs_stats(struct kfd_process *p) 535{ 536 int ret; 537 int i; 538 char stats_dir_filename[MAX_SYSFS_FILENAME_LEN]; 539 540 if (!p || !p->kobj) 541 return; 542 543 /* 544 * Create sysfs files for each GPU: 545 * - proc/<pid>/stats_<gpuid>/ 546 * - proc/<pid>/stats_<gpuid>/evicted_ms 547 * - proc/<pid>/stats_<gpuid>/cu_occupancy 548 */ 549 for (i = 0; i < p->n_pdds; i++) { 550 struct kfd_process_device *pdd = p->pdds[i]; 551 552 snprintf(stats_dir_filename, MAX_SYSFS_FILENAME_LEN, 553 "stats_%u", pdd->dev->id); 554 pdd->kobj_stats = kfd_alloc_struct(pdd->kobj_stats); 555 if (!pdd->kobj_stats) 556 return; 557 558 ret = kobject_init_and_add(pdd->kobj_stats, 559 &procfs_stats_type, 560 p->kobj, 561 stats_dir_filename); 562 563 if (ret) { 564 pr_warn("Creating KFD proc/stats_%s folder failed", 565 stats_dir_filename); 566 kobject_put(pdd->kobj_stats); 567 pdd->kobj_stats = NULL; 568 return; 569 } 570 571 kfd_sysfs_create_file(pdd->kobj_stats, &pdd->attr_evict, 572 "evicted_ms"); 573 /* Add sysfs file to report compute unit occupancy */ 574 if (pdd->dev->kfd2kgd->get_cu_occupancy) 575 kfd_sysfs_create_file(pdd->kobj_stats, 576 &pdd->attr_cu_occupancy, 577 "cu_occupancy"); 578 } 579} 580 581static void kfd_procfs_add_sysfs_counters(struct kfd_process *p) 582{ 583 int ret = 0; 584 int i; 585 char counters_dir_filename[MAX_SYSFS_FILENAME_LEN]; 586 587 if (!p || !p->kobj) 588 return; 589 590 /* 591 * Create sysfs files for each GPU which supports SVM 592 * - proc/<pid>/counters_<gpuid>/ 593 * - proc/<pid>/counters_<gpuid>/faults 594 * - proc/<pid>/counters_<gpuid>/page_in 595 * - proc/<pid>/counters_<gpuid>/page_out 596 */ 597 for_each_set_bit(i, p->svms.bitmap_supported, p->n_pdds) { 598 struct kfd_process_device *pdd = p->pdds[i]; 599 struct kobject *kobj_counters; 600 601 snprintf(counters_dir_filename, MAX_SYSFS_FILENAME_LEN, 602 "counters_%u", pdd->dev->id); 603 kobj_counters = kfd_alloc_struct(kobj_counters); 604 if (!kobj_counters) 605 return; 606 607 ret = kobject_init_and_add(kobj_counters, &sysfs_counters_type, 608 p->kobj, counters_dir_filename); 609 if (ret) { 610 pr_warn("Creating KFD proc/%s folder failed", 611 counters_dir_filename); 612 kobject_put(kobj_counters); 613 return; 614 } 615 616 pdd->kobj_counters = kobj_counters; 617 kfd_sysfs_create_file(kobj_counters, &pdd->attr_faults, 618 "faults"); 619 kfd_sysfs_create_file(kobj_counters, &pdd->attr_page_in, 620 "page_in"); 621 kfd_sysfs_create_file(kobj_counters, &pdd->attr_page_out, 622 "page_out"); 623 } 624} 625 626static void kfd_procfs_add_sysfs_files(struct kfd_process *p) 627{ 628 int i; 629 630 if (!p || !p->kobj) 631 return; 632 633 /* 634 * Create sysfs files for each GPU: 635 * - proc/<pid>/vram_<gpuid> 636 * - proc/<pid>/sdma_<gpuid> 637 */ 638 for (i = 0; i < p->n_pdds; i++) { 639 struct kfd_process_device *pdd = p->pdds[i]; 640 641 snprintf(pdd->vram_filename, MAX_SYSFS_FILENAME_LEN, "vram_%u", 642 pdd->dev->id); 643 kfd_sysfs_create_file(p->kobj, &pdd->attr_vram, 644 pdd->vram_filename); 645 646 snprintf(pdd->sdma_filename, MAX_SYSFS_FILENAME_LEN, "sdma_%u", 647 pdd->dev->id); 648 kfd_sysfs_create_file(p->kobj, &pdd->attr_sdma, 649 pdd->sdma_filename); 650 } 651} 652 653void kfd_procfs_del_queue(struct queue *q) 654{ 655 if (!q) 656 return; 657 658 kobject_del(&q->kobj); 659 kobject_put(&q->kobj); 660} 661 662int kfd_process_create_wq(void) 663{ 664 if (!kfd_process_wq) 665 kfd_process_wq = alloc_workqueue("kfd_process_wq", 0, 0); 666 if (!kfd_restore_wq) 667 kfd_restore_wq = alloc_ordered_workqueue("kfd_restore_wq", 668 WQ_FREEZABLE); 669 670 if (!kfd_process_wq || !kfd_restore_wq) { 671 kfd_process_destroy_wq(); 672 return -ENOMEM; 673 } 674 675 return 0; 676} 677 678void kfd_process_destroy_wq(void) 679{ 680 if (kfd_process_wq) { 681 destroy_workqueue(kfd_process_wq); 682 kfd_process_wq = NULL; 683 } 684 if (kfd_restore_wq) { 685 destroy_workqueue(kfd_restore_wq); 686 kfd_restore_wq = NULL; 687 } 688} 689 690static void kfd_process_free_gpuvm(struct kgd_mem *mem, 691 struct kfd_process_device *pdd, void **kptr) 692{ 693 struct kfd_node *dev = pdd->dev; 694 695 if (kptr && *kptr) { 696 amdgpu_amdkfd_gpuvm_unmap_gtt_bo_from_kernel(mem); 697 *kptr = NULL; 698 } 699 700 amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(dev->adev, mem, pdd->drm_priv); 701 amdgpu_amdkfd_gpuvm_free_memory_of_gpu(dev->adev, mem, pdd->drm_priv, 702 NULL); 703} 704 705/* kfd_process_alloc_gpuvm - Allocate GPU VM for the KFD process 706 * This function should be only called right after the process 707 * is created and when kfd_processes_mutex is still being held 708 * to avoid concurrency. Because of that exclusiveness, we do 709 * not need to take p->mutex. 710 */ 711static int kfd_process_alloc_gpuvm(struct kfd_process_device *pdd, 712 uint64_t gpu_va, uint32_t size, 713 uint32_t flags, struct kgd_mem **mem, void **kptr) 714{ 715 struct kfd_node *kdev = pdd->dev; 716 int err; 717 718 err = amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(kdev->adev, gpu_va, size, 719 pdd->drm_priv, mem, NULL, 720 flags, false); 721 if (err) 722 goto err_alloc_mem; 723 724 err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(kdev->adev, *mem, 725 pdd->drm_priv); 726 if (err) 727 goto err_map_mem; 728 729 err = amdgpu_amdkfd_gpuvm_sync_memory(kdev->adev, *mem, true); 730 if (err) { 731 pr_debug("Sync memory failed, wait interrupted by user signal\n"); 732 goto sync_memory_failed; 733 } 734 735 if (kptr) { 736 err = amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel( 737 (struct kgd_mem *)*mem, kptr, NULL); 738 if (err) { 739 pr_debug("Map GTT BO to kernel failed\n"); 740 goto sync_memory_failed; 741 } 742 } 743 744 return err; 745 746sync_memory_failed: 747 amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(kdev->adev, *mem, pdd->drm_priv); 748 749err_map_mem: 750 amdgpu_amdkfd_gpuvm_free_memory_of_gpu(kdev->adev, *mem, pdd->drm_priv, 751 NULL); 752err_alloc_mem: 753 *mem = NULL; 754 *kptr = NULL; 755 return err; 756} 757 758/* kfd_process_device_reserve_ib_mem - Reserve memory inside the 759 * process for IB usage The memory reserved is for KFD to submit 760 * IB to AMDGPU from kernel. If the memory is reserved 761 * successfully, ib_kaddr will have the CPU/kernel 762 * address. Check ib_kaddr before accessing the memory. 763 */ 764static int kfd_process_device_reserve_ib_mem(struct kfd_process_device *pdd) 765{ 766 struct qcm_process_device *qpd = &pdd->qpd; 767 uint32_t flags = KFD_IOC_ALLOC_MEM_FLAGS_GTT | 768 KFD_IOC_ALLOC_MEM_FLAGS_NO_SUBSTITUTE | 769 KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE | 770 KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE; 771 struct kgd_mem *mem; 772 void *kaddr; 773 int ret; 774 775 if (qpd->ib_kaddr || !qpd->ib_base) 776 return 0; 777 778 /* ib_base is only set for dGPU */ 779 ret = kfd_process_alloc_gpuvm(pdd, qpd->ib_base, PAGE_SIZE, flags, 780 &mem, &kaddr); 781 if (ret) 782 return ret; 783 784 qpd->ib_mem = mem; 785 qpd->ib_kaddr = kaddr; 786 787 return 0; 788} 789 790static void kfd_process_device_destroy_ib_mem(struct kfd_process_device *pdd) 791{ 792 struct qcm_process_device *qpd = &pdd->qpd; 793 794 if (!qpd->ib_kaddr || !qpd->ib_base) 795 return; 796 797 kfd_process_free_gpuvm(qpd->ib_mem, pdd, &qpd->ib_kaddr); 798} 799 800struct kfd_process *kfd_create_process(struct task_struct *thread) 801{ 802 struct kfd_process *process; 803 int ret; 804 805 if (!(thread->mm && mmget_not_zero(thread->mm))) 806 return ERR_PTR(-EINVAL); 807 808 /* Only the pthreads threading model is supported. */ 809 if (thread->group_leader->mm != thread->mm) { 810 mmput(thread->mm); 811 return ERR_PTR(-EINVAL); 812 } 813 814 /* 815 * take kfd processes mutex before starting of process creation 816 * so there won't be a case where two threads of the same process 817 * create two kfd_process structures 818 */ 819 mutex_lock(&kfd_processes_mutex); 820 821 if (kfd_is_locked()) { 822 pr_debug("KFD is locked! Cannot create process"); 823 process = ERR_PTR(-EINVAL); 824 goto out; 825 } 826 827 /* A prior open of /dev/kfd could have already created the process. */ 828 process = find_process(thread, false); 829 if (process) { 830 pr_debug("Process already found\n"); 831 } else { 832 process = create_process(thread); 833 if (IS_ERR(process)) 834 goto out; 835 836 if (!procfs.kobj) 837 goto out; 838 839 process->kobj = kfd_alloc_struct(process->kobj); 840 if (!process->kobj) { 841 pr_warn("Creating procfs kobject failed"); 842 goto out; 843 } 844 ret = kobject_init_and_add(process->kobj, &procfs_type, 845 procfs.kobj, "%d", 846 (int)process->lead_thread->pid); 847 if (ret) { 848 pr_warn("Creating procfs pid directory failed"); 849 kobject_put(process->kobj); 850 goto out; 851 } 852 853 kfd_sysfs_create_file(process->kobj, &process->attr_pasid, 854 "pasid"); 855 856 process->kobj_queues = kobject_create_and_add("queues", 857 process->kobj); 858 if (!process->kobj_queues) 859 pr_warn("Creating KFD proc/queues folder failed"); 860 861 kfd_procfs_add_sysfs_stats(process); 862 kfd_procfs_add_sysfs_files(process); 863 kfd_procfs_add_sysfs_counters(process); 864 865 init_waitqueue_head(&process->wait_irq_drain); 866 } 867out: 868 if (!IS_ERR(process)) 869 kref_get(&process->ref); 870 mutex_unlock(&kfd_processes_mutex); 871 mmput(thread->mm); 872 873 return process; 874} 875 876struct kfd_process *kfd_get_process(const struct task_struct *thread) 877{ 878 struct kfd_process *process; 879 880 if (!thread->mm) 881 return ERR_PTR(-EINVAL); 882 883 /* Only the pthreads threading model is supported. */ 884 if (thread->group_leader->mm != thread->mm) 885 return ERR_PTR(-EINVAL); 886 887 process = find_process(thread, false); 888 if (!process) 889 return ERR_PTR(-EINVAL); 890 891 return process; 892} 893 894static struct kfd_process *find_process_by_mm(const struct mm_struct *mm) 895{ 896 struct kfd_process *process; 897 898 hash_for_each_possible_rcu(kfd_processes_table, process, 899 kfd_processes, (uintptr_t)mm) 900 if (process->mm == mm) 901 return process; 902 903 return NULL; 904} 905 906static struct kfd_process *find_process(const struct task_struct *thread, 907 bool ref) 908{ 909 struct kfd_process *p; 910 int idx; 911 912 idx = srcu_read_lock(&kfd_processes_srcu); 913 p = find_process_by_mm(thread->mm); 914 if (p && ref) 915 kref_get(&p->ref); 916 srcu_read_unlock(&kfd_processes_srcu, idx); 917 918 return p; 919} 920 921void kfd_unref_process(struct kfd_process *p) 922{ 923 kref_put(&p->ref, kfd_process_ref_release); 924} 925 926/* This increments the process->ref counter. */ 927struct kfd_process *kfd_lookup_process_by_pid(struct pid *pid) 928{ 929 struct task_struct *task = NULL; 930 struct kfd_process *p = NULL; 931 932 if (!pid) { 933 task = current; 934 get_task_struct(task); 935 } else { 936 task = get_pid_task(pid, PIDTYPE_PID); 937 } 938 939 if (task) { 940 p = find_process(task, true); 941 put_task_struct(task); 942 } 943 944 return p; 945} 946 947static void kfd_process_device_free_bos(struct kfd_process_device *pdd) 948{ 949 struct kfd_process *p = pdd->process; 950 void *mem; 951 int id; 952 int i; 953 954 /* 955 * Remove all handles from idr and release appropriate 956 * local memory object 957 */ 958 idr_for_each_entry(&pdd->alloc_idr, mem, id) { 959 960 for (i = 0; i < p->n_pdds; i++) { 961 struct kfd_process_device *peer_pdd = p->pdds[i]; 962 963 if (!peer_pdd->drm_priv) 964 continue; 965 amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu( 966 peer_pdd->dev->adev, mem, peer_pdd->drm_priv); 967 } 968 969 amdgpu_amdkfd_gpuvm_free_memory_of_gpu(pdd->dev->adev, mem, 970 pdd->drm_priv, NULL); 971 kfd_process_device_remove_obj_handle(pdd, id); 972 } 973} 974 975/* 976 * Just kunmap and unpin signal BO here. It will be freed in 977 * kfd_process_free_outstanding_kfd_bos() 978 */ 979static void kfd_process_kunmap_signal_bo(struct kfd_process *p) 980{ 981 struct kfd_process_device *pdd; 982 struct kfd_node *kdev; 983 void *mem; 984 985 kdev = kfd_device_by_id(GET_GPU_ID(p->signal_handle)); 986 if (!kdev) 987 return; 988 989 mutex_lock(&p->mutex); 990 991 pdd = kfd_get_process_device_data(kdev, p); 992 if (!pdd) 993 goto out; 994 995 mem = kfd_process_device_translate_handle( 996 pdd, GET_IDR_HANDLE(p->signal_handle)); 997 if (!mem) 998 goto out; 999 1000 amdgpu_amdkfd_gpuvm_unmap_gtt_bo_from_kernel(mem); 1001 1002out: 1003 mutex_unlock(&p->mutex); 1004} 1005 1006static void kfd_process_free_outstanding_kfd_bos(struct kfd_process *p) 1007{ 1008 int i; 1009 1010 for (i = 0; i < p->n_pdds; i++) 1011 kfd_process_device_free_bos(p->pdds[i]); 1012} 1013 1014static void kfd_process_destroy_pdds(struct kfd_process *p) 1015{ 1016 int i; 1017 1018 for (i = 0; i < p->n_pdds; i++) { 1019 struct kfd_process_device *pdd = p->pdds[i]; 1020 1021 pr_debug("Releasing pdd (topology id %d) for process (pasid 0x%x)\n", 1022 pdd->dev->id, p->pasid); 1023 1024 kfd_process_device_destroy_cwsr_dgpu(pdd); 1025 kfd_process_device_destroy_ib_mem(pdd); 1026 1027 if (pdd->drm_file) { 1028 amdgpu_amdkfd_gpuvm_release_process_vm( 1029 pdd->dev->adev, pdd->drm_priv); 1030 fput(pdd->drm_file); 1031 } 1032 1033 if (pdd->qpd.cwsr_kaddr && !pdd->qpd.cwsr_base) 1034 free_pages((unsigned long)pdd->qpd.cwsr_kaddr, 1035 get_order(KFD_CWSR_TBA_TMA_SIZE)); 1036 1037 idr_destroy(&pdd->alloc_idr); 1038 1039 kfd_free_process_doorbells(pdd->dev->kfd, pdd); 1040 1041 if (pdd->dev->kfd->shared_resources.enable_mes) 1042 amdgpu_amdkfd_free_gtt_mem(pdd->dev->adev, 1043 pdd->proc_ctx_bo); 1044 /* 1045 * before destroying pdd, make sure to report availability 1046 * for auto suspend 1047 */ 1048 if (pdd->runtime_inuse) { 1049 pm_runtime_mark_last_busy(adev_to_drm(pdd->dev->adev)->dev); 1050 pm_runtime_put_autosuspend(adev_to_drm(pdd->dev->adev)->dev); 1051 pdd->runtime_inuse = false; 1052 } 1053 1054 kfree(pdd); 1055 p->pdds[i] = NULL; 1056 } 1057 p->n_pdds = 0; 1058} 1059 1060static void kfd_process_remove_sysfs(struct kfd_process *p) 1061{ 1062 struct kfd_process_device *pdd; 1063 int i; 1064 1065 if (!p->kobj) 1066 return; 1067 1068 sysfs_remove_file(p->kobj, &p->attr_pasid); 1069 kobject_del(p->kobj_queues); 1070 kobject_put(p->kobj_queues); 1071 p->kobj_queues = NULL; 1072 1073 for (i = 0; i < p->n_pdds; i++) { 1074 pdd = p->pdds[i]; 1075 1076 sysfs_remove_file(p->kobj, &pdd->attr_vram); 1077 sysfs_remove_file(p->kobj, &pdd->attr_sdma); 1078 1079 sysfs_remove_file(pdd->kobj_stats, &pdd->attr_evict); 1080 if (pdd->dev->kfd2kgd->get_cu_occupancy) 1081 sysfs_remove_file(pdd->kobj_stats, 1082 &pdd->attr_cu_occupancy); 1083 kobject_del(pdd->kobj_stats); 1084 kobject_put(pdd->kobj_stats); 1085 pdd->kobj_stats = NULL; 1086 } 1087 1088 for_each_set_bit(i, p->svms.bitmap_supported, p->n_pdds) { 1089 pdd = p->pdds[i]; 1090 1091 sysfs_remove_file(pdd->kobj_counters, &pdd->attr_faults); 1092 sysfs_remove_file(pdd->kobj_counters, &pdd->attr_page_in); 1093 sysfs_remove_file(pdd->kobj_counters, &pdd->attr_page_out); 1094 kobject_del(pdd->kobj_counters); 1095 kobject_put(pdd->kobj_counters); 1096 pdd->kobj_counters = NULL; 1097 } 1098 1099 kobject_del(p->kobj); 1100 kobject_put(p->kobj); 1101 p->kobj = NULL; 1102} 1103 1104/* No process locking is needed in this function, because the process 1105 * is not findable any more. We must assume that no other thread is 1106 * using it any more, otherwise we couldn't safely free the process 1107 * structure in the end. 1108 */ 1109static void kfd_process_wq_release(struct work_struct *work) 1110{ 1111 struct kfd_process *p = container_of(work, struct kfd_process, 1112 release_work); 1113 struct dma_fence *ef; 1114 1115 kfd_process_dequeue_from_all_devices(p); 1116 pqm_uninit(&p->pqm); 1117 1118 /* Signal the eviction fence after user mode queues are 1119 * destroyed. This allows any BOs to be freed without 1120 * triggering pointless evictions or waiting for fences. 1121 */ 1122 synchronize_rcu(); 1123 ef = rcu_access_pointer(p->ef); 1124 dma_fence_signal(ef); 1125 1126 kfd_process_remove_sysfs(p); 1127 1128 kfd_process_kunmap_signal_bo(p); 1129 kfd_process_free_outstanding_kfd_bos(p); 1130 svm_range_list_fini(p); 1131 1132 kfd_process_destroy_pdds(p); 1133 dma_fence_put(ef); 1134 1135 kfd_event_free_process(p); 1136 1137 kfd_pasid_free(p->pasid); 1138 mutex_destroy(&p->mutex); 1139 1140 put_task_struct(p->lead_thread); 1141 1142 kfree(p); 1143} 1144 1145static void kfd_process_ref_release(struct kref *ref) 1146{ 1147 struct kfd_process *p = container_of(ref, struct kfd_process, ref); 1148 1149 INIT_WORK(&p->release_work, kfd_process_wq_release); 1150 queue_work(kfd_process_wq, &p->release_work); 1151} 1152 1153static struct mmu_notifier *kfd_process_alloc_notifier(struct mm_struct *mm) 1154{ 1155 int idx = srcu_read_lock(&kfd_processes_srcu); 1156 struct kfd_process *p = find_process_by_mm(mm); 1157 1158 srcu_read_unlock(&kfd_processes_srcu, idx); 1159 1160 return p ? &p->mmu_notifier : ERR_PTR(-ESRCH); 1161} 1162 1163static void kfd_process_free_notifier(struct mmu_notifier *mn) 1164{ 1165 kfd_unref_process(container_of(mn, struct kfd_process, mmu_notifier)); 1166} 1167 1168static void kfd_process_notifier_release_internal(struct kfd_process *p) 1169{ 1170 int i; 1171 1172 cancel_delayed_work_sync(&p->eviction_work); 1173 cancel_delayed_work_sync(&p->restore_work); 1174 1175 for (i = 0; i < p->n_pdds; i++) { 1176 struct kfd_process_device *pdd = p->pdds[i]; 1177 1178 /* re-enable GFX OFF since runtime enable with ttmp setup disabled it. */ 1179 if (!kfd_dbg_is_rlc_restore_supported(pdd->dev) && p->runtime_info.ttmp_setup) 1180 amdgpu_gfx_off_ctrl(pdd->dev->adev, true); 1181 } 1182 1183 /* Indicate to other users that MM is no longer valid */ 1184 p->mm = NULL; 1185 kfd_dbg_trap_disable(p); 1186 1187 if (atomic_read(&p->debugged_process_count) > 0) { 1188 struct kfd_process *target; 1189 unsigned int temp; 1190 int idx = srcu_read_lock(&kfd_processes_srcu); 1191 1192 hash_for_each_rcu(kfd_processes_table, temp, target, kfd_processes) { 1193 if (target->debugger_process && target->debugger_process == p) { 1194 mutex_lock_nested(&target->mutex, 1); 1195 kfd_dbg_trap_disable(target); 1196 mutex_unlock(&target->mutex); 1197 if (atomic_read(&p->debugged_process_count) == 0) 1198 break; 1199 } 1200 } 1201 1202 srcu_read_unlock(&kfd_processes_srcu, idx); 1203 } 1204 1205 mmu_notifier_put(&p->mmu_notifier); 1206} 1207 1208static void kfd_process_notifier_release(struct mmu_notifier *mn, 1209 struct mm_struct *mm) 1210{ 1211 struct kfd_process *p; 1212 1213 /* 1214 * The kfd_process structure can not be free because the 1215 * mmu_notifier srcu is read locked 1216 */ 1217 p = container_of(mn, struct kfd_process, mmu_notifier); 1218 if (WARN_ON(p->mm != mm)) 1219 return; 1220 1221 mutex_lock(&kfd_processes_mutex); 1222 /* 1223 * Do early return if table is empty. 1224 * 1225 * This could potentially happen if this function is called concurrently 1226 * by mmu_notifier and by kfd_cleanup_pocesses. 1227 * 1228 */ 1229 if (hash_empty(kfd_processes_table)) { 1230 mutex_unlock(&kfd_processes_mutex); 1231 return; 1232 } 1233 hash_del_rcu(&p->kfd_processes); 1234 mutex_unlock(&kfd_processes_mutex); 1235 synchronize_srcu(&kfd_processes_srcu); 1236 1237 kfd_process_notifier_release_internal(p); 1238} 1239 1240static const struct mmu_notifier_ops kfd_process_mmu_notifier_ops = { 1241 .release = kfd_process_notifier_release, 1242 .alloc_notifier = kfd_process_alloc_notifier, 1243 .free_notifier = kfd_process_free_notifier, 1244}; 1245 1246/* 1247 * This code handles the case when driver is being unloaded before all 1248 * mm_struct are released. We need to safely free the kfd_process and 1249 * avoid race conditions with mmu_notifier that might try to free them. 1250 * 1251 */ 1252void kfd_cleanup_processes(void) 1253{ 1254 struct kfd_process *p; 1255 struct hlist_node *p_temp; 1256 unsigned int temp; 1257 HLIST_HEAD(cleanup_list); 1258 1259 /* 1260 * Move all remaining kfd_process from the process table to a 1261 * temp list for processing. Once done, callback from mmu_notifier 1262 * release will not see the kfd_process in the table and do early return, 1263 * avoiding double free issues. 1264 */ 1265 mutex_lock(&kfd_processes_mutex); 1266 hash_for_each_safe(kfd_processes_table, temp, p_temp, p, kfd_processes) { 1267 hash_del_rcu(&p->kfd_processes); 1268 synchronize_srcu(&kfd_processes_srcu); 1269 hlist_add_head(&p->kfd_processes, &cleanup_list); 1270 } 1271 mutex_unlock(&kfd_processes_mutex); 1272 1273 hlist_for_each_entry_safe(p, p_temp, &cleanup_list, kfd_processes) 1274 kfd_process_notifier_release_internal(p); 1275 1276 /* 1277 * Ensures that all outstanding free_notifier get called, triggering 1278 * the release of the kfd_process struct. 1279 */ 1280 mmu_notifier_synchronize(); 1281} 1282 1283int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep) 1284{ 1285 unsigned long offset; 1286 int i; 1287 1288 if (p->has_cwsr) 1289 return 0; 1290 1291 for (i = 0; i < p->n_pdds; i++) { 1292 struct kfd_node *dev = p->pdds[i]->dev; 1293 struct qcm_process_device *qpd = &p->pdds[i]->qpd; 1294 1295 if (!dev->kfd->cwsr_enabled || qpd->cwsr_kaddr || qpd->cwsr_base) 1296 continue; 1297 1298 offset = KFD_MMAP_TYPE_RESERVED_MEM | KFD_MMAP_GPU_ID(dev->id); 1299 qpd->tba_addr = (int64_t)vm_mmap(filep, 0, 1300 KFD_CWSR_TBA_TMA_SIZE, PROT_READ | PROT_EXEC, 1301 MAP_SHARED, offset); 1302 1303 if (IS_ERR_VALUE(qpd->tba_addr)) { 1304 int err = qpd->tba_addr; 1305 1306 pr_err("Failure to set tba address. error %d.\n", err); 1307 qpd->tba_addr = 0; 1308 qpd->cwsr_kaddr = NULL; 1309 return err; 1310 } 1311 1312 memcpy(qpd->cwsr_kaddr, dev->kfd->cwsr_isa, dev->kfd->cwsr_isa_size); 1313 1314 kfd_process_set_trap_debug_flag(qpd, p->debug_trap_enabled); 1315 1316 qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET; 1317 pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n", 1318 qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr); 1319 } 1320 1321 p->has_cwsr = true; 1322 1323 return 0; 1324} 1325 1326static int kfd_process_device_init_cwsr_dgpu(struct kfd_process_device *pdd) 1327{ 1328 struct kfd_node *dev = pdd->dev; 1329 struct qcm_process_device *qpd = &pdd->qpd; 1330 uint32_t flags = KFD_IOC_ALLOC_MEM_FLAGS_GTT 1331 | KFD_IOC_ALLOC_MEM_FLAGS_NO_SUBSTITUTE 1332 | KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE; 1333 struct kgd_mem *mem; 1334 void *kaddr; 1335 int ret; 1336 1337 if (!dev->kfd->cwsr_enabled || qpd->cwsr_kaddr || !qpd->cwsr_base) 1338 return 0; 1339 1340 /* cwsr_base is only set for dGPU */ 1341 ret = kfd_process_alloc_gpuvm(pdd, qpd->cwsr_base, 1342 KFD_CWSR_TBA_TMA_SIZE, flags, &mem, &kaddr); 1343 if (ret) 1344 return ret; 1345 1346 qpd->cwsr_mem = mem; 1347 qpd->cwsr_kaddr = kaddr; 1348 qpd->tba_addr = qpd->cwsr_base; 1349 1350 memcpy(qpd->cwsr_kaddr, dev->kfd->cwsr_isa, dev->kfd->cwsr_isa_size); 1351 1352 kfd_process_set_trap_debug_flag(&pdd->qpd, 1353 pdd->process->debug_trap_enabled); 1354 1355 qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET; 1356 pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n", 1357 qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr); 1358 1359 return 0; 1360} 1361 1362static void kfd_process_device_destroy_cwsr_dgpu(struct kfd_process_device *pdd) 1363{ 1364 struct kfd_node *dev = pdd->dev; 1365 struct qcm_process_device *qpd = &pdd->qpd; 1366 1367 if (!dev->kfd->cwsr_enabled || !qpd->cwsr_kaddr || !qpd->cwsr_base) 1368 return; 1369 1370 kfd_process_free_gpuvm(qpd->cwsr_mem, pdd, &qpd->cwsr_kaddr); 1371} 1372 1373void kfd_process_set_trap_handler(struct qcm_process_device *qpd, 1374 uint64_t tba_addr, 1375 uint64_t tma_addr) 1376{ 1377 if (qpd->cwsr_kaddr) { 1378 /* KFD trap handler is bound, record as second-level TBA/TMA 1379 * in first-level TMA. First-level trap will jump to second. 1380 */ 1381 uint64_t *tma = 1382 (uint64_t *)(qpd->cwsr_kaddr + KFD_CWSR_TMA_OFFSET); 1383 tma[0] = tba_addr; 1384 tma[1] = tma_addr; 1385 } else { 1386 /* No trap handler bound, bind as first-level TBA/TMA. */ 1387 qpd->tba_addr = tba_addr; 1388 qpd->tma_addr = tma_addr; 1389 } 1390} 1391 1392bool kfd_process_xnack_mode(struct kfd_process *p, bool supported) 1393{ 1394 int i; 1395 1396 /* On most GFXv9 GPUs, the retry mode in the SQ must match the 1397 * boot time retry setting. Mixing processes with different 1398 * XNACK/retry settings can hang the GPU. 1399 * 1400 * Different GPUs can have different noretry settings depending 1401 * on HW bugs or limitations. We need to find at least one 1402 * XNACK mode for this process that's compatible with all GPUs. 1403 * Fortunately GPUs with retry enabled (noretry=0) can run code 1404 * built for XNACK-off. On GFXv9 it may perform slower. 1405 * 1406 * Therefore applications built for XNACK-off can always be 1407 * supported and will be our fallback if any GPU does not 1408 * support retry. 1409 */ 1410 for (i = 0; i < p->n_pdds; i++) { 1411 struct kfd_node *dev = p->pdds[i]->dev; 1412 1413 /* Only consider GFXv9 and higher GPUs. Older GPUs don't 1414 * support the SVM APIs and don't need to be considered 1415 * for the XNACK mode selection. 1416 */ 1417 if (!KFD_IS_SOC15(dev)) 1418 continue; 1419 /* Aldebaran can always support XNACK because it can support 1420 * per-process XNACK mode selection. But let the dev->noretry 1421 * setting still influence the default XNACK mode. 1422 */ 1423 if (supported && KFD_SUPPORT_XNACK_PER_PROCESS(dev)) { 1424 if (!amdgpu_sriov_xnack_support(dev->kfd->adev)) { 1425 pr_debug("SRIOV platform xnack not supported\n"); 1426 return false; 1427 } 1428 continue; 1429 } 1430 1431 /* GFXv10 and later GPUs do not support shader preemption 1432 * during page faults. This can lead to poor QoS for queue 1433 * management and memory-manager-related preemptions or 1434 * even deadlocks. 1435 */ 1436 if (KFD_GC_VERSION(dev) >= IP_VERSION(10, 1, 1)) 1437 return false; 1438 1439 if (dev->kfd->noretry) 1440 return false; 1441 } 1442 1443 return true; 1444} 1445 1446void kfd_process_set_trap_debug_flag(struct qcm_process_device *qpd, 1447 bool enabled) 1448{ 1449 if (qpd->cwsr_kaddr) { 1450 uint64_t *tma = 1451 (uint64_t *)(qpd->cwsr_kaddr + KFD_CWSR_TMA_OFFSET); 1452 tma[2] = enabled; 1453 } 1454} 1455 1456/* 1457 * On return the kfd_process is fully operational and will be freed when the 1458 * mm is released 1459 */ 1460static struct kfd_process *create_process(const struct task_struct *thread) 1461{ 1462 struct kfd_process *process; 1463 struct mmu_notifier *mn; 1464 int err = -ENOMEM; 1465 1466 process = kzalloc(sizeof(*process), GFP_KERNEL); 1467 if (!process) 1468 goto err_alloc_process; 1469 1470 kref_init(&process->ref); 1471 mutex_init(&process->mutex); 1472 process->mm = thread->mm; 1473 process->lead_thread = thread->group_leader; 1474 process->n_pdds = 0; 1475 process->queues_paused = false; 1476 INIT_DELAYED_WORK(&process->eviction_work, evict_process_worker); 1477 INIT_DELAYED_WORK(&process->restore_work, restore_process_worker); 1478 process->last_restore_timestamp = get_jiffies_64(); 1479 err = kfd_event_init_process(process); 1480 if (err) 1481 goto err_event_init; 1482 process->is_32bit_user_mode = in_compat_syscall(); 1483 process->debug_trap_enabled = false; 1484 process->debugger_process = NULL; 1485 process->exception_enable_mask = 0; 1486 atomic_set(&process->debugged_process_count, 0); 1487 sema_init(&process->runtime_enable_sema, 0); 1488 1489 process->pasid = kfd_pasid_alloc(); 1490 if (process->pasid == 0) { 1491 err = -ENOSPC; 1492 goto err_alloc_pasid; 1493 } 1494 1495 err = pqm_init(&process->pqm, process); 1496 if (err != 0) 1497 goto err_process_pqm_init; 1498 1499 /* init process apertures*/ 1500 err = kfd_init_apertures(process); 1501 if (err != 0) 1502 goto err_init_apertures; 1503 1504 /* Check XNACK support after PDDs are created in kfd_init_apertures */ 1505 process->xnack_enabled = kfd_process_xnack_mode(process, false); 1506 1507 err = svm_range_list_init(process); 1508 if (err) 1509 goto err_init_svm_range_list; 1510 1511 /* alloc_notifier needs to find the process in the hash table */ 1512 hash_add_rcu(kfd_processes_table, &process->kfd_processes, 1513 (uintptr_t)process->mm); 1514 1515 /* Avoid free_notifier to start kfd_process_wq_release if 1516 * mmu_notifier_get failed because of pending signal. 1517 */ 1518 kref_get(&process->ref); 1519 1520 /* MMU notifier registration must be the last call that can fail 1521 * because after this point we cannot unwind the process creation. 1522 * After this point, mmu_notifier_put will trigger the cleanup by 1523 * dropping the last process reference in the free_notifier. 1524 */ 1525 mn = mmu_notifier_get(&kfd_process_mmu_notifier_ops, process->mm); 1526 if (IS_ERR(mn)) { 1527 err = PTR_ERR(mn); 1528 goto err_register_notifier; 1529 } 1530 BUG_ON(mn != &process->mmu_notifier); 1531 1532 kfd_unref_process(process); 1533 get_task_struct(process->lead_thread); 1534 1535 INIT_WORK(&process->debug_event_workarea, debug_event_write_work_handler); 1536 1537 return process; 1538 1539err_register_notifier: 1540 hash_del_rcu(&process->kfd_processes); 1541 svm_range_list_fini(process); 1542err_init_svm_range_list: 1543 kfd_process_free_outstanding_kfd_bos(process); 1544 kfd_process_destroy_pdds(process); 1545err_init_apertures: 1546 pqm_uninit(&process->pqm); 1547err_process_pqm_init: 1548 kfd_pasid_free(process->pasid); 1549err_alloc_pasid: 1550 kfd_event_free_process(process); 1551err_event_init: 1552 mutex_destroy(&process->mutex); 1553 kfree(process); 1554err_alloc_process: 1555 return ERR_PTR(err); 1556} 1557 1558struct kfd_process_device *kfd_get_process_device_data(struct kfd_node *dev, 1559 struct kfd_process *p) 1560{ 1561 int i; 1562 1563 for (i = 0; i < p->n_pdds; i++) 1564 if (p->pdds[i]->dev == dev) 1565 return p->pdds[i]; 1566 1567 return NULL; 1568} 1569 1570struct kfd_process_device *kfd_create_process_device_data(struct kfd_node *dev, 1571 struct kfd_process *p) 1572{ 1573 struct kfd_process_device *pdd = NULL; 1574 int retval = 0; 1575 1576 if (WARN_ON_ONCE(p->n_pdds >= MAX_GPU_INSTANCE)) 1577 return NULL; 1578 pdd = kzalloc(sizeof(*pdd), GFP_KERNEL); 1579 if (!pdd) 1580 return NULL; 1581 1582 pdd->dev = dev; 1583 INIT_LIST_HEAD(&pdd->qpd.queues_list); 1584 INIT_LIST_HEAD(&pdd->qpd.priv_queue_list); 1585 pdd->qpd.dqm = dev->dqm; 1586 pdd->qpd.pqm = &p->pqm; 1587 pdd->qpd.evicted = 0; 1588 pdd->qpd.mapped_gws_queue = false; 1589 pdd->process = p; 1590 pdd->bound = PDD_UNBOUND; 1591 pdd->already_dequeued = false; 1592 pdd->runtime_inuse = false; 1593 pdd->vram_usage = 0; 1594 pdd->sdma_past_activity_counter = 0; 1595 pdd->user_gpu_id = dev->id; 1596 atomic64_set(&pdd->evict_duration_counter, 0); 1597 1598 if (dev->kfd->shared_resources.enable_mes) { 1599 retval = amdgpu_amdkfd_alloc_gtt_mem(dev->adev, 1600 AMDGPU_MES_PROC_CTX_SIZE, 1601 &pdd->proc_ctx_bo, 1602 &pdd->proc_ctx_gpu_addr, 1603 &pdd->proc_ctx_cpu_ptr, 1604 false); 1605 if (retval) { 1606 pr_err("failed to allocate process context bo\n"); 1607 goto err_free_pdd; 1608 } 1609 memset(pdd->proc_ctx_cpu_ptr, 0, AMDGPU_MES_PROC_CTX_SIZE); 1610 } 1611 1612 p->pdds[p->n_pdds++] = pdd; 1613 if (kfd_dbg_is_per_vmid_supported(pdd->dev)) 1614 pdd->spi_dbg_override = pdd->dev->kfd2kgd->disable_debug_trap( 1615 pdd->dev->adev, 1616 false, 1617 0); 1618 1619 /* Init idr used for memory handle translation */ 1620 idr_init(&pdd->alloc_idr); 1621 1622 return pdd; 1623 1624err_free_pdd: 1625 kfree(pdd); 1626 return NULL; 1627} 1628 1629/** 1630 * kfd_process_device_init_vm - Initialize a VM for a process-device 1631 * 1632 * @pdd: The process-device 1633 * @drm_file: Optional pointer to a DRM file descriptor 1634 * 1635 * If @drm_file is specified, it will be used to acquire the VM from 1636 * that file descriptor. If successful, the @pdd takes ownership of 1637 * the file descriptor. 1638 * 1639 * If @drm_file is NULL, a new VM is created. 1640 * 1641 * Returns 0 on success, -errno on failure. 1642 */ 1643int kfd_process_device_init_vm(struct kfd_process_device *pdd, 1644 struct file *drm_file) 1645{ 1646 struct amdgpu_fpriv *drv_priv; 1647 struct amdgpu_vm *avm; 1648 struct kfd_process *p; 1649 struct dma_fence *ef; 1650 struct kfd_node *dev; 1651 int ret; 1652 1653 if (!drm_file) 1654 return -EINVAL; 1655 1656 if (pdd->drm_priv) 1657 return -EBUSY; 1658 1659 ret = amdgpu_file_to_fpriv(drm_file, &drv_priv); 1660 if (ret) 1661 return ret; 1662 avm = &drv_priv->vm; 1663 1664 p = pdd->process; 1665 dev = pdd->dev; 1666 1667 ret = amdgpu_amdkfd_gpuvm_acquire_process_vm(dev->adev, avm, 1668 &p->kgd_process_info, 1669 &ef); 1670 if (ret) { 1671 pr_err("Failed to create process VM object\n"); 1672 return ret; 1673 } 1674 RCU_INIT_POINTER(p->ef, ef); 1675 pdd->drm_priv = drm_file->private_data; 1676 1677 ret = kfd_process_device_reserve_ib_mem(pdd); 1678 if (ret) 1679 goto err_reserve_ib_mem; 1680 ret = kfd_process_device_init_cwsr_dgpu(pdd); 1681 if (ret) 1682 goto err_init_cwsr; 1683 1684 ret = amdgpu_amdkfd_gpuvm_set_vm_pasid(dev->adev, avm, p->pasid); 1685 if (ret) 1686 goto err_set_pasid; 1687 1688 pdd->drm_file = drm_file; 1689 1690 return 0; 1691 1692err_set_pasid: 1693 kfd_process_device_destroy_cwsr_dgpu(pdd); 1694err_init_cwsr: 1695 kfd_process_device_destroy_ib_mem(pdd); 1696err_reserve_ib_mem: 1697 pdd->drm_priv = NULL; 1698 amdgpu_amdkfd_gpuvm_destroy_cb(dev->adev, avm); 1699 1700 return ret; 1701} 1702 1703/* 1704 * Direct the IOMMU to bind the process (specifically the pasid->mm) 1705 * to the device. 1706 * Unbinding occurs when the process dies or the device is removed. 1707 * 1708 * Assumes that the process lock is held. 1709 */ 1710struct kfd_process_device *kfd_bind_process_to_device(struct kfd_node *dev, 1711 struct kfd_process *p) 1712{ 1713 struct kfd_process_device *pdd; 1714 int err; 1715 1716 pdd = kfd_get_process_device_data(dev, p); 1717 if (!pdd) { 1718 pr_err("Process device data doesn't exist\n"); 1719 return ERR_PTR(-ENOMEM); 1720 } 1721 1722 if (!pdd->drm_priv) 1723 return ERR_PTR(-ENODEV); 1724 1725 /* 1726 * signal runtime-pm system to auto resume and prevent 1727 * further runtime suspend once device pdd is created until 1728 * pdd is destroyed. 1729 */ 1730 if (!pdd->runtime_inuse) { 1731 err = pm_runtime_get_sync(adev_to_drm(dev->adev)->dev); 1732 if (err < 0) { 1733 pm_runtime_put_autosuspend(adev_to_drm(dev->adev)->dev); 1734 return ERR_PTR(err); 1735 } 1736 } 1737 1738 /* 1739 * make sure that runtime_usage counter is incremented just once 1740 * per pdd 1741 */ 1742 pdd->runtime_inuse = true; 1743 1744 return pdd; 1745} 1746 1747/* Create specific handle mapped to mem from process local memory idr 1748 * Assumes that the process lock is held. 1749 */ 1750int kfd_process_device_create_obj_handle(struct kfd_process_device *pdd, 1751 void *mem) 1752{ 1753 return idr_alloc(&pdd->alloc_idr, mem, 0, 0, GFP_KERNEL); 1754} 1755 1756/* Translate specific handle from process local memory idr 1757 * Assumes that the process lock is held. 1758 */ 1759void *kfd_process_device_translate_handle(struct kfd_process_device *pdd, 1760 int handle) 1761{ 1762 if (handle < 0) 1763 return NULL; 1764 1765 return idr_find(&pdd->alloc_idr, handle); 1766} 1767 1768/* Remove specific handle from process local memory idr 1769 * Assumes that the process lock is held. 1770 */ 1771void kfd_process_device_remove_obj_handle(struct kfd_process_device *pdd, 1772 int handle) 1773{ 1774 if (handle >= 0) 1775 idr_remove(&pdd->alloc_idr, handle); 1776} 1777 1778/* This increments the process->ref counter. */ 1779struct kfd_process *kfd_lookup_process_by_pasid(u32 pasid) 1780{ 1781 struct kfd_process *p, *ret_p = NULL; 1782 unsigned int temp; 1783 1784 int idx = srcu_read_lock(&kfd_processes_srcu); 1785 1786 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) { 1787 if (p->pasid == pasid) { 1788 kref_get(&p->ref); 1789 ret_p = p; 1790 break; 1791 } 1792 } 1793 1794 srcu_read_unlock(&kfd_processes_srcu, idx); 1795 1796 return ret_p; 1797} 1798 1799/* This increments the process->ref counter. */ 1800struct kfd_process *kfd_lookup_process_by_mm(const struct mm_struct *mm) 1801{ 1802 struct kfd_process *p; 1803 1804 int idx = srcu_read_lock(&kfd_processes_srcu); 1805 1806 p = find_process_by_mm(mm); 1807 if (p) 1808 kref_get(&p->ref); 1809 1810 srcu_read_unlock(&kfd_processes_srcu, idx); 1811 1812 return p; 1813} 1814 1815/* kfd_process_evict_queues - Evict all user queues of a process 1816 * 1817 * Eviction is reference-counted per process-device. This means multiple 1818 * evictions from different sources can be nested safely. 1819 */ 1820int kfd_process_evict_queues(struct kfd_process *p, uint32_t trigger) 1821{ 1822 int r = 0; 1823 int i; 1824 unsigned int n_evicted = 0; 1825 1826 for (i = 0; i < p->n_pdds; i++) { 1827 struct kfd_process_device *pdd = p->pdds[i]; 1828 1829 kfd_smi_event_queue_eviction(pdd->dev, p->lead_thread->pid, 1830 trigger); 1831 1832 r = pdd->dev->dqm->ops.evict_process_queues(pdd->dev->dqm, 1833 &pdd->qpd); 1834 /* evict return -EIO if HWS is hang or asic is resetting, in this case 1835 * we would like to set all the queues to be in evicted state to prevent 1836 * them been add back since they actually not be saved right now. 1837 */ 1838 if (r && r != -EIO) { 1839 pr_err("Failed to evict process queues\n"); 1840 goto fail; 1841 } 1842 n_evicted++; 1843 } 1844 1845 return r; 1846 1847fail: 1848 /* To keep state consistent, roll back partial eviction by 1849 * restoring queues 1850 */ 1851 for (i = 0; i < p->n_pdds; i++) { 1852 struct kfd_process_device *pdd = p->pdds[i]; 1853 1854 if (n_evicted == 0) 1855 break; 1856 1857 kfd_smi_event_queue_restore(pdd->dev, p->lead_thread->pid); 1858 1859 if (pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm, 1860 &pdd->qpd)) 1861 pr_err("Failed to restore queues\n"); 1862 1863 n_evicted--; 1864 } 1865 1866 return r; 1867} 1868 1869/* kfd_process_restore_queues - Restore all user queues of a process */ 1870int kfd_process_restore_queues(struct kfd_process *p) 1871{ 1872 int r, ret = 0; 1873 int i; 1874 1875 for (i = 0; i < p->n_pdds; i++) { 1876 struct kfd_process_device *pdd = p->pdds[i]; 1877 1878 kfd_smi_event_queue_restore(pdd->dev, p->lead_thread->pid); 1879 1880 r = pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm, 1881 &pdd->qpd); 1882 if (r) { 1883 pr_err("Failed to restore process queues\n"); 1884 if (!ret) 1885 ret = r; 1886 } 1887 } 1888 1889 return ret; 1890} 1891 1892int kfd_process_gpuidx_from_gpuid(struct kfd_process *p, uint32_t gpu_id) 1893{ 1894 int i; 1895 1896 for (i = 0; i < p->n_pdds; i++) 1897 if (p->pdds[i] && gpu_id == p->pdds[i]->user_gpu_id) 1898 return i; 1899 return -EINVAL; 1900} 1901 1902int 1903kfd_process_gpuid_from_node(struct kfd_process *p, struct kfd_node *node, 1904 uint32_t *gpuid, uint32_t *gpuidx) 1905{ 1906 int i; 1907 1908 for (i = 0; i < p->n_pdds; i++) 1909 if (p->pdds[i] && p->pdds[i]->dev == node) { 1910 *gpuid = p->pdds[i]->user_gpu_id; 1911 *gpuidx = i; 1912 return 0; 1913 } 1914 return -EINVAL; 1915} 1916 1917static int signal_eviction_fence(struct kfd_process *p) 1918{ 1919 struct dma_fence *ef; 1920 int ret; 1921 1922 rcu_read_lock(); 1923 ef = dma_fence_get_rcu_safe(&p->ef); 1924 rcu_read_unlock(); 1925 1926 ret = dma_fence_signal(ef); 1927 dma_fence_put(ef); 1928 1929 return ret; 1930} 1931 1932static void evict_process_worker(struct work_struct *work) 1933{ 1934 int ret; 1935 struct kfd_process *p; 1936 struct delayed_work *dwork; 1937 1938 dwork = to_delayed_work(work); 1939 1940 /* Process termination destroys this worker thread. So during the 1941 * lifetime of this thread, kfd_process p will be valid 1942 */ 1943 p = container_of(dwork, struct kfd_process, eviction_work); 1944 1945 pr_debug("Started evicting pasid 0x%x\n", p->pasid); 1946 ret = kfd_process_evict_queues(p, KFD_QUEUE_EVICTION_TRIGGER_TTM); 1947 if (!ret) { 1948 /* If another thread already signaled the eviction fence, 1949 * they are responsible stopping the queues and scheduling 1950 * the restore work. 1951 */ 1952 if (!signal_eviction_fence(p)) 1953 queue_delayed_work(kfd_restore_wq, &p->restore_work, 1954 msecs_to_jiffies(PROCESS_RESTORE_TIME_MS)); 1955 else 1956 kfd_process_restore_queues(p); 1957 1958 pr_debug("Finished evicting pasid 0x%x\n", p->pasid); 1959 } else 1960 pr_err("Failed to evict queues of pasid 0x%x\n", p->pasid); 1961} 1962 1963static int restore_process_helper(struct kfd_process *p) 1964{ 1965 int ret = 0; 1966 1967 /* VMs may not have been acquired yet during debugging. */ 1968 if (p->kgd_process_info) { 1969 ret = amdgpu_amdkfd_gpuvm_restore_process_bos( 1970 p->kgd_process_info, &p->ef); 1971 if (ret) 1972 return ret; 1973 } 1974 1975 ret = kfd_process_restore_queues(p); 1976 if (!ret) 1977 pr_debug("Finished restoring pasid 0x%x\n", p->pasid); 1978 else 1979 pr_err("Failed to restore queues of pasid 0x%x\n", p->pasid); 1980 1981 return ret; 1982} 1983 1984static void restore_process_worker(struct work_struct *work) 1985{ 1986 struct delayed_work *dwork; 1987 struct kfd_process *p; 1988 int ret = 0; 1989 1990 dwork = to_delayed_work(work); 1991 1992 /* Process termination destroys this worker thread. So during the 1993 * lifetime of this thread, kfd_process p will be valid 1994 */ 1995 p = container_of(dwork, struct kfd_process, restore_work); 1996 pr_debug("Started restoring pasid 0x%x\n", p->pasid); 1997 1998 /* Setting last_restore_timestamp before successful restoration. 1999 * Otherwise this would have to be set by KGD (restore_process_bos) 2000 * before KFD BOs are unreserved. If not, the process can be evicted 2001 * again before the timestamp is set. 2002 * If restore fails, the timestamp will be set again in the next 2003 * attempt. This would mean that the minimum GPU quanta would be 2004 * PROCESS_ACTIVE_TIME_MS - (time to execute the following two 2005 * functions) 2006 */ 2007 2008 p->last_restore_timestamp = get_jiffies_64(); 2009 2010 ret = restore_process_helper(p); 2011 if (ret) { 2012 pr_debug("Failed to restore BOs of pasid 0x%x, retry after %d ms\n", 2013 p->pasid, PROCESS_BACK_OFF_TIME_MS); 2014 ret = queue_delayed_work(kfd_restore_wq, &p->restore_work, 2015 msecs_to_jiffies(PROCESS_BACK_OFF_TIME_MS)); 2016 WARN(!ret, "reschedule restore work failed\n"); 2017 } 2018} 2019 2020void kfd_suspend_all_processes(void) 2021{ 2022 struct kfd_process *p; 2023 unsigned int temp; 2024 int idx = srcu_read_lock(&kfd_processes_srcu); 2025 2026 WARN(debug_evictions, "Evicting all processes"); 2027 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) { 2028 if (kfd_process_evict_queues(p, KFD_QUEUE_EVICTION_TRIGGER_SUSPEND)) 2029 pr_err("Failed to suspend process 0x%x\n", p->pasid); 2030 signal_eviction_fence(p); 2031 } 2032 srcu_read_unlock(&kfd_processes_srcu, idx); 2033} 2034 2035int kfd_resume_all_processes(void) 2036{ 2037 struct kfd_process *p; 2038 unsigned int temp; 2039 int ret = 0, idx = srcu_read_lock(&kfd_processes_srcu); 2040 2041 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) { 2042 if (restore_process_helper(p)) { 2043 pr_err("Restore process %d failed during resume\n", 2044 p->pasid); 2045 ret = -EFAULT; 2046 } 2047 } 2048 srcu_read_unlock(&kfd_processes_srcu, idx); 2049 return ret; 2050} 2051 2052int kfd_reserved_mem_mmap(struct kfd_node *dev, struct kfd_process *process, 2053 struct vm_area_struct *vma) 2054{ 2055 struct kfd_process_device *pdd; 2056 struct qcm_process_device *qpd; 2057 2058 if ((vma->vm_end - vma->vm_start) != KFD_CWSR_TBA_TMA_SIZE) { 2059 pr_err("Incorrect CWSR mapping size.\n"); 2060 return -EINVAL; 2061 } 2062 2063 pdd = kfd_get_process_device_data(dev, process); 2064 if (!pdd) 2065 return -EINVAL; 2066 qpd = &pdd->qpd; 2067 2068 qpd->cwsr_kaddr = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 2069 get_order(KFD_CWSR_TBA_TMA_SIZE)); 2070 if (!qpd->cwsr_kaddr) { 2071 pr_err("Error allocating per process CWSR buffer.\n"); 2072 return -ENOMEM; 2073 } 2074 2075 vm_flags_set(vma, VM_IO | VM_DONTCOPY | VM_DONTEXPAND 2076 | VM_NORESERVE | VM_DONTDUMP | VM_PFNMAP); 2077 /* Mapping pages to user process */ 2078 return remap_pfn_range(vma, vma->vm_start, 2079 PFN_DOWN(__pa(qpd->cwsr_kaddr)), 2080 KFD_CWSR_TBA_TMA_SIZE, vma->vm_page_prot); 2081} 2082 2083/* assumes caller holds process lock. */ 2084int kfd_process_drain_interrupts(struct kfd_process_device *pdd) 2085{ 2086 uint32_t irq_drain_fence[8]; 2087 uint8_t node_id = 0; 2088 int r = 0; 2089 2090 if (!KFD_IS_SOC15(pdd->dev)) 2091 return 0; 2092 2093 pdd->process->irq_drain_is_open = true; 2094 2095 memset(irq_drain_fence, 0, sizeof(irq_drain_fence)); 2096 irq_drain_fence[0] = (KFD_IRQ_FENCE_SOURCEID << 8) | 2097 KFD_IRQ_FENCE_CLIENTID; 2098 irq_drain_fence[3] = pdd->process->pasid; 2099 2100 /* 2101 * For GFX 9.4.3, send the NodeId also in IH cookie DW[3] 2102 */ 2103 if (KFD_GC_VERSION(pdd->dev->kfd) == IP_VERSION(9, 4, 3)) { 2104 node_id = ffs(pdd->dev->interrupt_bitmap) - 1; 2105 irq_drain_fence[3] |= node_id << 16; 2106 } 2107 2108 /* ensure stale irqs scheduled KFD interrupts and send drain fence. */ 2109 if (amdgpu_amdkfd_send_close_event_drain_irq(pdd->dev->adev, 2110 irq_drain_fence)) { 2111 pdd->process->irq_drain_is_open = false; 2112 return 0; 2113 } 2114 2115 r = wait_event_interruptible(pdd->process->wait_irq_drain, 2116 !READ_ONCE(pdd->process->irq_drain_is_open)); 2117 if (r) 2118 pdd->process->irq_drain_is_open = false; 2119 2120 return r; 2121} 2122 2123void kfd_process_close_interrupt_drain(unsigned int pasid) 2124{ 2125 struct kfd_process *p; 2126 2127 p = kfd_lookup_process_by_pasid(pasid); 2128 2129 if (!p) 2130 return; 2131 2132 WRITE_ONCE(p->irq_drain_is_open, false); 2133 wake_up_all(&p->wait_irq_drain); 2134 kfd_unref_process(p); 2135} 2136 2137struct send_exception_work_handler_workarea { 2138 struct work_struct work; 2139 struct kfd_process *p; 2140 unsigned int queue_id; 2141 uint64_t error_reason; 2142}; 2143 2144static void send_exception_work_handler(struct work_struct *work) 2145{ 2146 struct send_exception_work_handler_workarea *workarea; 2147 struct kfd_process *p; 2148 struct queue *q; 2149 struct mm_struct *mm; 2150 struct kfd_context_save_area_header __user *csa_header; 2151 uint64_t __user *err_payload_ptr; 2152 uint64_t cur_err; 2153 uint32_t ev_id; 2154 2155 workarea = container_of(work, 2156 struct send_exception_work_handler_workarea, 2157 work); 2158 p = workarea->p; 2159 2160 mm = get_task_mm(p->lead_thread); 2161 2162 if (!mm) 2163 return; 2164 2165 kthread_use_mm(mm); 2166 2167 q = pqm_get_user_queue(&p->pqm, workarea->queue_id); 2168 2169 if (!q) 2170 goto out; 2171 2172 csa_header = (void __user *)q->properties.ctx_save_restore_area_address; 2173 2174 get_user(err_payload_ptr, (uint64_t __user **)&csa_header->err_payload_addr); 2175 get_user(cur_err, err_payload_ptr); 2176 cur_err |= workarea->error_reason; 2177 put_user(cur_err, err_payload_ptr); 2178 get_user(ev_id, &csa_header->err_event_id); 2179 2180 kfd_set_event(p, ev_id); 2181 2182out: 2183 kthread_unuse_mm(mm); 2184 mmput(mm); 2185} 2186 2187int kfd_send_exception_to_runtime(struct kfd_process *p, 2188 unsigned int queue_id, 2189 uint64_t error_reason) 2190{ 2191 struct send_exception_work_handler_workarea worker; 2192 2193 INIT_WORK_ONSTACK(&worker.work, send_exception_work_handler); 2194 2195 worker.p = p; 2196 worker.queue_id = queue_id; 2197 worker.error_reason = error_reason; 2198 2199 schedule_work(&worker.work); 2200 flush_work(&worker.work); 2201 destroy_work_on_stack(&worker.work); 2202 2203 return 0; 2204} 2205 2206struct kfd_process_device *kfd_process_device_data_by_id(struct kfd_process *p, uint32_t gpu_id) 2207{ 2208 int i; 2209 2210 if (gpu_id) { 2211 for (i = 0; i < p->n_pdds; i++) { 2212 struct kfd_process_device *pdd = p->pdds[i]; 2213 2214 if (pdd->user_gpu_id == gpu_id) 2215 return pdd; 2216 } 2217 } 2218 return NULL; 2219} 2220 2221int kfd_process_get_user_gpu_id(struct kfd_process *p, uint32_t actual_gpu_id) 2222{ 2223 int i; 2224 2225 if (!actual_gpu_id) 2226 return 0; 2227 2228 for (i = 0; i < p->n_pdds; i++) { 2229 struct kfd_process_device *pdd = p->pdds[i]; 2230 2231 if (pdd->dev->id == actual_gpu_id) 2232 return pdd->user_gpu_id; 2233 } 2234 return -EINVAL; 2235} 2236 2237#if defined(CONFIG_DEBUG_FS) 2238 2239int kfd_debugfs_mqds_by_process(struct seq_file *m, void *data) 2240{ 2241 struct kfd_process *p; 2242 unsigned int temp; 2243 int r = 0; 2244 2245 int idx = srcu_read_lock(&kfd_processes_srcu); 2246 2247 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) { 2248 seq_printf(m, "Process %d PASID 0x%x:\n", 2249 p->lead_thread->tgid, p->pasid); 2250 2251 mutex_lock(&p->mutex); 2252 r = pqm_debugfs_mqds(m, &p->pqm); 2253 mutex_unlock(&p->mutex); 2254 2255 if (r) 2256 break; 2257 } 2258 2259 srcu_read_unlock(&kfd_processes_srcu, idx); 2260 2261 return r; 2262} 2263 2264#endif 2265