linux/drivers/gpu/drm/amd/amdkfd/kfd_process.c
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   1/*
   2 * Copyright 2014 Advanced Micro Devices, Inc.
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 */
  22
  23#include <linux/mutex.h>
  24#include <linux/log2.h>
  25#include <linux/sched.h>
  26#include <linux/sched/mm.h>
  27#include <linux/sched/task.h>
  28#include <linux/mmu_context.h>
  29#include <linux/slab.h>
  30#include <linux/amd-iommu.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_dbgmgr.h"
  44#include "kfd_iommu.h"
  45#include "kfd_svm.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);
  52static DEFINE_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);
  68static void kfd_process_ref_release(struct kref *ref);
  69static struct kfd_process *create_process(const struct task_struct *thread);
  70static int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep);
  71
  72static void evict_process_worker(struct work_struct *work);
  73static void restore_process_worker(struct work_struct *work);
  74
  75struct kfd_procfs_tree {
  76        struct kobject *kobj;
  77};
  78
  79static struct kfd_procfs_tree procfs;
  80
  81/*
  82 * Structure for SDMA activity tracking
  83 */
  84struct kfd_sdma_activity_handler_workarea {
  85        struct work_struct sdma_activity_work;
  86        struct kfd_process_device *pdd;
  87        uint64_t sdma_activity_counter;
  88};
  89
  90struct temp_sdma_queue_list {
  91        uint64_t __user *rptr;
  92        uint64_t sdma_val;
  93        unsigned int queue_id;
  94        struct list_head list;
  95};
  96
  97static void kfd_sdma_activity_worker(struct work_struct *work)
  98{
  99        struct kfd_sdma_activity_handler_workarea *workarea;
 100        struct kfd_process_device *pdd;
 101        uint64_t val;
 102        struct mm_struct *mm;
 103        struct queue *q;
 104        struct qcm_process_device *qpd;
 105        struct device_queue_manager *dqm;
 106        int ret = 0;
 107        struct temp_sdma_queue_list sdma_q_list;
 108        struct temp_sdma_queue_list *sdma_q, *next;
 109
 110        workarea = container_of(work, struct kfd_sdma_activity_handler_workarea,
 111                                sdma_activity_work);
 112
 113        pdd = workarea->pdd;
 114        if (!pdd)
 115                return;
 116        dqm = pdd->dev->dqm;
 117        qpd = &pdd->qpd;
 118        if (!dqm || !qpd)
 119                return;
 120        /*
 121         * Total SDMA activity is current SDMA activity + past SDMA activity
 122         * Past SDMA count is stored in pdd.
 123         * To get the current activity counters for all active SDMA queues,
 124         * we loop over all SDMA queues and get their counts from user-space.
 125         *
 126         * We cannot call get_user() with dqm_lock held as it can cause
 127         * a circular lock dependency situation. To read the SDMA stats,
 128         * we need to do the following:
 129         *
 130         * 1. Create a temporary list of SDMA queue nodes from the qpd->queues_list,
 131         *    with dqm_lock/dqm_unlock().
 132         * 2. Call get_user() for each node in temporary list without dqm_lock.
 133         *    Save the SDMA count for each node and also add the count to the total
 134         *    SDMA count counter.
 135         *    Its possible, during this step, a few SDMA queue nodes got deleted
 136         *    from the qpd->queues_list.
 137         * 3. Do a second pass over qpd->queues_list to check if any nodes got deleted.
 138         *    If any node got deleted, its SDMA count would be captured in the sdma
 139         *    past activity counter. So subtract the SDMA counter stored in step 2
 140         *    for this node from the total SDMA count.
 141         */
 142        INIT_LIST_HEAD(&sdma_q_list.list);
 143
 144        /*
 145         * Create the temp list of all SDMA queues
 146         */
 147        dqm_lock(dqm);
 148
 149        list_for_each_entry(q, &qpd->queues_list, list) {
 150                if ((q->properties.type != KFD_QUEUE_TYPE_SDMA) &&
 151                    (q->properties.type != KFD_QUEUE_TYPE_SDMA_XGMI))
 152                        continue;
 153
 154                sdma_q = kzalloc(sizeof(struct temp_sdma_queue_list), GFP_KERNEL);
 155                if (!sdma_q) {
 156                        dqm_unlock(dqm);
 157                        goto cleanup;
 158                }
 159
 160                INIT_LIST_HEAD(&sdma_q->list);
 161                sdma_q->rptr = (uint64_t __user *)q->properties.read_ptr;
 162                sdma_q->queue_id = q->properties.queue_id;
 163                list_add_tail(&sdma_q->list, &sdma_q_list.list);
 164        }
 165
 166        /*
 167         * If the temp list is empty, then no SDMA queues nodes were found in
 168         * qpd->queues_list. Return the past activity count as the total sdma
 169         * count
 170         */
 171        if (list_empty(&sdma_q_list.list)) {
 172                workarea->sdma_activity_counter = pdd->sdma_past_activity_counter;
 173                dqm_unlock(dqm);
 174                return;
 175        }
 176
 177        dqm_unlock(dqm);
 178
 179        /*
 180         * Get the usage count for each SDMA queue in temp_list.
 181         */
 182        mm = get_task_mm(pdd->process->lead_thread);
 183        if (!mm)
 184                goto cleanup;
 185
 186        kthread_use_mm(mm);
 187
 188        list_for_each_entry(sdma_q, &sdma_q_list.list, list) {
 189                val = 0;
 190                ret = read_sdma_queue_counter(sdma_q->rptr, &val);
 191                if (ret) {
 192                        pr_debug("Failed to read SDMA queue active counter for queue id: %d",
 193                                 sdma_q->queue_id);
 194                } else {
 195                        sdma_q->sdma_val = val;
 196                        workarea->sdma_activity_counter += val;
 197                }
 198        }
 199
 200        kthread_unuse_mm(mm);
 201        mmput(mm);
 202
 203        /*
 204         * Do a second iteration over qpd_queues_list to check if any SDMA
 205         * nodes got deleted while fetching SDMA counter.
 206         */
 207        dqm_lock(dqm);
 208
 209        workarea->sdma_activity_counter += pdd->sdma_past_activity_counter;
 210
 211        list_for_each_entry(q, &qpd->queues_list, list) {
 212                if (list_empty(&sdma_q_list.list))
 213                        break;
 214
 215                if ((q->properties.type != KFD_QUEUE_TYPE_SDMA) &&
 216                    (q->properties.type != KFD_QUEUE_TYPE_SDMA_XGMI))
 217                        continue;
 218
 219                list_for_each_entry_safe(sdma_q, next, &sdma_q_list.list, list) {
 220                        if (((uint64_t __user *)q->properties.read_ptr == sdma_q->rptr) &&
 221                             (sdma_q->queue_id == q->properties.queue_id)) {
 222                                list_del(&sdma_q->list);
 223                                kfree(sdma_q);
 224                                break;
 225                        }
 226                }
 227        }
 228
 229        dqm_unlock(dqm);
 230
 231        /*
 232         * If temp list is not empty, it implies some queues got deleted
 233         * from qpd->queues_list during SDMA usage read. Subtract the SDMA
 234         * count for each node from the total SDMA count.
 235         */
 236        list_for_each_entry_safe(sdma_q, next, &sdma_q_list.list, list) {
 237                workarea->sdma_activity_counter -= sdma_q->sdma_val;
 238                list_del(&sdma_q->list);
 239                kfree(sdma_q);
 240        }
 241
 242        return;
 243
 244cleanup:
 245        list_for_each_entry_safe(sdma_q, next, &sdma_q_list.list, list) {
 246                list_del(&sdma_q->list);
 247                kfree(sdma_q);
 248        }
 249}
 250
 251/**
 252 * @kfd_get_cu_occupancy - Collect number of waves in-flight on this device
 253 * by current process. Translates acquired wave count into number of compute units
 254 * that are occupied.
 255 *
 256 * @atr: Handle of attribute that allows reporting of wave count. The attribute
 257 * handle encapsulates GPU device it is associated with, thereby allowing collection
 258 * of waves in flight, etc
 259 *
 260 * @buffer: Handle of user provided buffer updated with wave count
 261 *
 262 * Return: Number of bytes written to user buffer or an error value
 263 */
 264static int kfd_get_cu_occupancy(struct attribute *attr, char *buffer)
 265{
 266        int cu_cnt;
 267        int wave_cnt;
 268        int max_waves_per_cu;
 269        struct kfd_dev *dev = NULL;
 270        struct kfd_process *proc = NULL;
 271        struct kfd_process_device *pdd = NULL;
 272
 273        pdd = container_of(attr, struct kfd_process_device, attr_cu_occupancy);
 274        dev = pdd->dev;
 275        if (dev->kfd2kgd->get_cu_occupancy == NULL)
 276                return -EINVAL;
 277
 278        cu_cnt = 0;
 279        proc = pdd->process;
 280        if (pdd->qpd.queue_count == 0) {
 281                pr_debug("Gpu-Id: %d has no active queues for process %d\n",
 282                         dev->id, proc->pasid);
 283                return snprintf(buffer, PAGE_SIZE, "%d\n", cu_cnt);
 284        }
 285
 286        /* Collect wave count from device if it supports */
 287        wave_cnt = 0;
 288        max_waves_per_cu = 0;
 289        dev->kfd2kgd->get_cu_occupancy(dev->kgd, proc->pasid, &wave_cnt,
 290                        &max_waves_per_cu);
 291
 292        /* Translate wave count to number of compute units */
 293        cu_cnt = (wave_cnt + (max_waves_per_cu - 1)) / max_waves_per_cu;
 294        return snprintf(buffer, PAGE_SIZE, "%d\n", cu_cnt);
 295}
 296
 297static ssize_t kfd_procfs_show(struct kobject *kobj, struct attribute *attr,
 298                               char *buffer)
 299{
 300        if (strcmp(attr->name, "pasid") == 0) {
 301                struct kfd_process *p = container_of(attr, struct kfd_process,
 302                                                     attr_pasid);
 303
 304                return snprintf(buffer, PAGE_SIZE, "%d\n", p->pasid);
 305        } else if (strncmp(attr->name, "vram_", 5) == 0) {
 306                struct kfd_process_device *pdd = container_of(attr, struct kfd_process_device,
 307                                                              attr_vram);
 308                return snprintf(buffer, PAGE_SIZE, "%llu\n", READ_ONCE(pdd->vram_usage));
 309        } else if (strncmp(attr->name, "sdma_", 5) == 0) {
 310                struct kfd_process_device *pdd = container_of(attr, struct kfd_process_device,
 311                                                              attr_sdma);
 312                struct kfd_sdma_activity_handler_workarea sdma_activity_work_handler;
 313
 314                INIT_WORK(&sdma_activity_work_handler.sdma_activity_work,
 315                                        kfd_sdma_activity_worker);
 316
 317                sdma_activity_work_handler.pdd = pdd;
 318                sdma_activity_work_handler.sdma_activity_counter = 0;
 319
 320                schedule_work(&sdma_activity_work_handler.sdma_activity_work);
 321
 322                flush_work(&sdma_activity_work_handler.sdma_activity_work);
 323
 324                return snprintf(buffer, PAGE_SIZE, "%llu\n",
 325                                (sdma_activity_work_handler.sdma_activity_counter)/
 326                                 SDMA_ACTIVITY_DIVISOR);
 327        } else {
 328                pr_err("Invalid attribute");
 329                return -EINVAL;
 330        }
 331
 332        return 0;
 333}
 334
 335static void kfd_procfs_kobj_release(struct kobject *kobj)
 336{
 337        kfree(kobj);
 338}
 339
 340static const struct sysfs_ops kfd_procfs_ops = {
 341        .show = kfd_procfs_show,
 342};
 343
 344static struct kobj_type procfs_type = {
 345        .release = kfd_procfs_kobj_release,
 346        .sysfs_ops = &kfd_procfs_ops,
 347};
 348
 349void kfd_procfs_init(void)
 350{
 351        int ret = 0;
 352
 353        procfs.kobj = kfd_alloc_struct(procfs.kobj);
 354        if (!procfs.kobj)
 355                return;
 356
 357        ret = kobject_init_and_add(procfs.kobj, &procfs_type,
 358                                   &kfd_device->kobj, "proc");
 359        if (ret) {
 360                pr_warn("Could not create procfs proc folder");
 361                /* If we fail to create the procfs, clean up */
 362                kfd_procfs_shutdown();
 363        }
 364}
 365
 366void kfd_procfs_shutdown(void)
 367{
 368        if (procfs.kobj) {
 369                kobject_del(procfs.kobj);
 370                kobject_put(procfs.kobj);
 371                procfs.kobj = NULL;
 372        }
 373}
 374
 375static ssize_t kfd_procfs_queue_show(struct kobject *kobj,
 376                                     struct attribute *attr, char *buffer)
 377{
 378        struct queue *q = container_of(kobj, struct queue, kobj);
 379
 380        if (!strcmp(attr->name, "size"))
 381                return snprintf(buffer, PAGE_SIZE, "%llu",
 382                                q->properties.queue_size);
 383        else if (!strcmp(attr->name, "type"))
 384                return snprintf(buffer, PAGE_SIZE, "%d", q->properties.type);
 385        else if (!strcmp(attr->name, "gpuid"))
 386                return snprintf(buffer, PAGE_SIZE, "%u", q->device->id);
 387        else
 388                pr_err("Invalid attribute");
 389
 390        return 0;
 391}
 392
 393static ssize_t kfd_procfs_stats_show(struct kobject *kobj,
 394                                     struct attribute *attr, char *buffer)
 395{
 396        if (strcmp(attr->name, "evicted_ms") == 0) {
 397                struct kfd_process_device *pdd = container_of(attr,
 398                                struct kfd_process_device,
 399                                attr_evict);
 400                uint64_t evict_jiffies;
 401
 402                evict_jiffies = atomic64_read(&pdd->evict_duration_counter);
 403
 404                return snprintf(buffer,
 405                                PAGE_SIZE,
 406                                "%llu\n",
 407                                jiffies64_to_msecs(evict_jiffies));
 408
 409        /* Sysfs handle that gets CU occupancy is per device */
 410        } else if (strcmp(attr->name, "cu_occupancy") == 0) {
 411                return kfd_get_cu_occupancy(attr, buffer);
 412        } else {
 413                pr_err("Invalid attribute");
 414        }
 415
 416        return 0;
 417}
 418
 419static ssize_t kfd_sysfs_counters_show(struct kobject *kobj,
 420                                       struct attribute *attr, char *buf)
 421{
 422        struct kfd_process_device *pdd;
 423
 424        if (!strcmp(attr->name, "faults")) {
 425                pdd = container_of(attr, struct kfd_process_device,
 426                                   attr_faults);
 427                return sysfs_emit(buf, "%llu\n", READ_ONCE(pdd->faults));
 428        }
 429        if (!strcmp(attr->name, "page_in")) {
 430                pdd = container_of(attr, struct kfd_process_device,
 431                                   attr_page_in);
 432                return sysfs_emit(buf, "%llu\n", READ_ONCE(pdd->page_in));
 433        }
 434        if (!strcmp(attr->name, "page_out")) {
 435                pdd = container_of(attr, struct kfd_process_device,
 436                                   attr_page_out);
 437                return sysfs_emit(buf, "%llu\n", READ_ONCE(pdd->page_out));
 438        }
 439        return 0;
 440}
 441
 442static struct attribute attr_queue_size = {
 443        .name = "size",
 444        .mode = KFD_SYSFS_FILE_MODE
 445};
 446
 447static struct attribute attr_queue_type = {
 448        .name = "type",
 449        .mode = KFD_SYSFS_FILE_MODE
 450};
 451
 452static struct attribute attr_queue_gpuid = {
 453        .name = "gpuid",
 454        .mode = KFD_SYSFS_FILE_MODE
 455};
 456
 457static struct attribute *procfs_queue_attrs[] = {
 458        &attr_queue_size,
 459        &attr_queue_type,
 460        &attr_queue_gpuid,
 461        NULL
 462};
 463
 464static const struct sysfs_ops procfs_queue_ops = {
 465        .show = kfd_procfs_queue_show,
 466};
 467
 468static struct kobj_type procfs_queue_type = {
 469        .sysfs_ops = &procfs_queue_ops,
 470        .default_attrs = procfs_queue_attrs,
 471};
 472
 473static const struct sysfs_ops procfs_stats_ops = {
 474        .show = kfd_procfs_stats_show,
 475};
 476
 477static struct kobj_type procfs_stats_type = {
 478        .sysfs_ops = &procfs_stats_ops,
 479        .release = kfd_procfs_kobj_release,
 480};
 481
 482static const struct sysfs_ops sysfs_counters_ops = {
 483        .show = kfd_sysfs_counters_show,
 484};
 485
 486static struct kobj_type sysfs_counters_type = {
 487        .sysfs_ops = &sysfs_counters_ops,
 488        .release = kfd_procfs_kobj_release,
 489};
 490
 491int kfd_procfs_add_queue(struct queue *q)
 492{
 493        struct kfd_process *proc;
 494        int ret;
 495
 496        if (!q || !q->process)
 497                return -EINVAL;
 498        proc = q->process;
 499
 500        /* Create proc/<pid>/queues/<queue id> folder */
 501        if (!proc->kobj_queues)
 502                return -EFAULT;
 503        ret = kobject_init_and_add(&q->kobj, &procfs_queue_type,
 504                        proc->kobj_queues, "%u", q->properties.queue_id);
 505        if (ret < 0) {
 506                pr_warn("Creating proc/<pid>/queues/%u failed",
 507                        q->properties.queue_id);
 508                kobject_put(&q->kobj);
 509                return ret;
 510        }
 511
 512        return 0;
 513}
 514
 515static void kfd_sysfs_create_file(struct kobject *kobj, struct attribute *attr,
 516                                 char *name)
 517{
 518        int ret;
 519
 520        if (!kobj || !attr || !name)
 521                return;
 522
 523        attr->name = name;
 524        attr->mode = KFD_SYSFS_FILE_MODE;
 525        sysfs_attr_init(attr);
 526
 527        ret = sysfs_create_file(kobj, attr);
 528        if (ret)
 529                pr_warn("Create sysfs %s/%s failed %d", kobj->name, name, ret);
 530}
 531
 532static void kfd_procfs_add_sysfs_stats(struct kfd_process *p)
 533{
 534        int ret;
 535        int i;
 536        char stats_dir_filename[MAX_SYSFS_FILENAME_LEN];
 537
 538        if (!p || !p->kobj)
 539                return;
 540
 541        /*
 542         * Create sysfs files for each GPU:
 543         * - proc/<pid>/stats_<gpuid>/
 544         * - proc/<pid>/stats_<gpuid>/evicted_ms
 545         * - proc/<pid>/stats_<gpuid>/cu_occupancy
 546         */
 547        for (i = 0; i < p->n_pdds; i++) {
 548                struct kfd_process_device *pdd = p->pdds[i];
 549
 550                snprintf(stats_dir_filename, MAX_SYSFS_FILENAME_LEN,
 551                                "stats_%u", pdd->dev->id);
 552                pdd->kobj_stats = kfd_alloc_struct(pdd->kobj_stats);
 553                if (!pdd->kobj_stats)
 554                        return;
 555
 556                ret = kobject_init_and_add(pdd->kobj_stats,
 557                                           &procfs_stats_type,
 558                                           p->kobj,
 559                                           stats_dir_filename);
 560
 561                if (ret) {
 562                        pr_warn("Creating KFD proc/stats_%s folder failed",
 563                                stats_dir_filename);
 564                        kobject_put(pdd->kobj_stats);
 565                        pdd->kobj_stats = NULL;
 566                        return;
 567                }
 568
 569                kfd_sysfs_create_file(pdd->kobj_stats, &pdd->attr_evict,
 570                                      "evicted_ms");
 571                /* Add sysfs file to report compute unit occupancy */
 572                if (pdd->dev->kfd2kgd->get_cu_occupancy)
 573                        kfd_sysfs_create_file(pdd->kobj_stats,
 574                                              &pdd->attr_cu_occupancy,
 575                                              "cu_occupancy");
 576        }
 577}
 578
 579static void kfd_procfs_add_sysfs_counters(struct kfd_process *p)
 580{
 581        int ret = 0;
 582        int i;
 583        char counters_dir_filename[MAX_SYSFS_FILENAME_LEN];
 584
 585        if (!p || !p->kobj)
 586                return;
 587
 588        /*
 589         * Create sysfs files for each GPU which supports SVM
 590         * - proc/<pid>/counters_<gpuid>/
 591         * - proc/<pid>/counters_<gpuid>/faults
 592         * - proc/<pid>/counters_<gpuid>/page_in
 593         * - proc/<pid>/counters_<gpuid>/page_out
 594         */
 595        for_each_set_bit(i, p->svms.bitmap_supported, p->n_pdds) {
 596                struct kfd_process_device *pdd = p->pdds[i];
 597                struct kobject *kobj_counters;
 598
 599                snprintf(counters_dir_filename, MAX_SYSFS_FILENAME_LEN,
 600                        "counters_%u", pdd->dev->id);
 601                kobj_counters = kfd_alloc_struct(kobj_counters);
 602                if (!kobj_counters)
 603                        return;
 604
 605                ret = kobject_init_and_add(kobj_counters, &sysfs_counters_type,
 606                                           p->kobj, counters_dir_filename);
 607                if (ret) {
 608                        pr_warn("Creating KFD proc/%s folder failed",
 609                                counters_dir_filename);
 610                        kobject_put(kobj_counters);
 611                        return;
 612                }
 613
 614                pdd->kobj_counters = kobj_counters;
 615                kfd_sysfs_create_file(kobj_counters, &pdd->attr_faults,
 616                                      "faults");
 617                kfd_sysfs_create_file(kobj_counters, &pdd->attr_page_in,
 618                                      "page_in");
 619                kfd_sysfs_create_file(kobj_counters, &pdd->attr_page_out,
 620                                      "page_out");
 621        }
 622}
 623
 624static void kfd_procfs_add_sysfs_files(struct kfd_process *p)
 625{
 626        int i;
 627
 628        if (!p || !p->kobj)
 629                return;
 630
 631        /*
 632         * Create sysfs files for each GPU:
 633         * - proc/<pid>/vram_<gpuid>
 634         * - proc/<pid>/sdma_<gpuid>
 635         */
 636        for (i = 0; i < p->n_pdds; i++) {
 637                struct kfd_process_device *pdd = p->pdds[i];
 638
 639                snprintf(pdd->vram_filename, MAX_SYSFS_FILENAME_LEN, "vram_%u",
 640                         pdd->dev->id);
 641                kfd_sysfs_create_file(p->kobj, &pdd->attr_vram,
 642                                      pdd->vram_filename);
 643
 644                snprintf(pdd->sdma_filename, MAX_SYSFS_FILENAME_LEN, "sdma_%u",
 645                         pdd->dev->id);
 646                kfd_sysfs_create_file(p->kobj, &pdd->attr_sdma,
 647                                            pdd->sdma_filename);
 648        }
 649}
 650
 651void kfd_procfs_del_queue(struct queue *q)
 652{
 653        if (!q)
 654                return;
 655
 656        kobject_del(&q->kobj);
 657        kobject_put(&q->kobj);
 658}
 659
 660int kfd_process_create_wq(void)
 661{
 662        if (!kfd_process_wq)
 663                kfd_process_wq = alloc_workqueue("kfd_process_wq", 0, 0);
 664        if (!kfd_restore_wq)
 665                kfd_restore_wq = alloc_ordered_workqueue("kfd_restore_wq", 0);
 666
 667        if (!kfd_process_wq || !kfd_restore_wq) {
 668                kfd_process_destroy_wq();
 669                return -ENOMEM;
 670        }
 671
 672        return 0;
 673}
 674
 675void kfd_process_destroy_wq(void)
 676{
 677        if (kfd_process_wq) {
 678                destroy_workqueue(kfd_process_wq);
 679                kfd_process_wq = NULL;
 680        }
 681        if (kfd_restore_wq) {
 682                destroy_workqueue(kfd_restore_wq);
 683                kfd_restore_wq = NULL;
 684        }
 685}
 686
 687static void kfd_process_free_gpuvm(struct kgd_mem *mem,
 688                        struct kfd_process_device *pdd)
 689{
 690        struct kfd_dev *dev = pdd->dev;
 691
 692        amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(dev->kgd, mem, pdd->drm_priv);
 693        amdgpu_amdkfd_gpuvm_free_memory_of_gpu(dev->kgd, mem, pdd->drm_priv,
 694                                               NULL);
 695}
 696
 697/* kfd_process_alloc_gpuvm - Allocate GPU VM for the KFD process
 698 *      This function should be only called right after the process
 699 *      is created and when kfd_processes_mutex is still being held
 700 *      to avoid concurrency. Because of that exclusiveness, we do
 701 *      not need to take p->mutex.
 702 */
 703static int kfd_process_alloc_gpuvm(struct kfd_process_device *pdd,
 704                                   uint64_t gpu_va, uint32_t size,
 705                                   uint32_t flags, void **kptr)
 706{
 707        struct kfd_dev *kdev = pdd->dev;
 708        struct kgd_mem *mem = NULL;
 709        int handle;
 710        int err;
 711
 712        err = amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(kdev->kgd, gpu_va, size,
 713                                                 pdd->drm_priv, &mem, NULL, flags);
 714        if (err)
 715                goto err_alloc_mem;
 716
 717        err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(kdev->kgd, mem, pdd->drm_priv);
 718        if (err)
 719                goto err_map_mem;
 720
 721        err = amdgpu_amdkfd_gpuvm_sync_memory(kdev->kgd, mem, true);
 722        if (err) {
 723                pr_debug("Sync memory failed, wait interrupted by user signal\n");
 724                goto sync_memory_failed;
 725        }
 726
 727        /* Create an obj handle so kfd_process_device_remove_obj_handle
 728         * will take care of the bo removal when the process finishes.
 729         * We do not need to take p->mutex, because the process is just
 730         * created and the ioctls have not had the chance to run.
 731         */
 732        handle = kfd_process_device_create_obj_handle(pdd, mem);
 733
 734        if (handle < 0) {
 735                err = handle;
 736                goto free_gpuvm;
 737        }
 738
 739        if (kptr) {
 740                err = amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel(kdev->kgd,
 741                                (struct kgd_mem *)mem, kptr, NULL);
 742                if (err) {
 743                        pr_debug("Map GTT BO to kernel failed\n");
 744                        goto free_obj_handle;
 745                }
 746        }
 747
 748        return err;
 749
 750free_obj_handle:
 751        kfd_process_device_remove_obj_handle(pdd, handle);
 752free_gpuvm:
 753sync_memory_failed:
 754        kfd_process_free_gpuvm(mem, pdd);
 755        return err;
 756
 757err_map_mem:
 758        amdgpu_amdkfd_gpuvm_free_memory_of_gpu(kdev->kgd, mem, pdd->drm_priv,
 759                                               NULL);
 760err_alloc_mem:
 761        *kptr = NULL;
 762        return err;
 763}
 764
 765/* kfd_process_device_reserve_ib_mem - Reserve memory inside the
 766 *      process for IB usage The memory reserved is for KFD to submit
 767 *      IB to AMDGPU from kernel.  If the memory is reserved
 768 *      successfully, ib_kaddr will have the CPU/kernel
 769 *      address. Check ib_kaddr before accessing the memory.
 770 */
 771static int kfd_process_device_reserve_ib_mem(struct kfd_process_device *pdd)
 772{
 773        struct qcm_process_device *qpd = &pdd->qpd;
 774        uint32_t flags = KFD_IOC_ALLOC_MEM_FLAGS_GTT |
 775                        KFD_IOC_ALLOC_MEM_FLAGS_NO_SUBSTITUTE |
 776                        KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE |
 777                        KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE;
 778        void *kaddr;
 779        int ret;
 780
 781        if (qpd->ib_kaddr || !qpd->ib_base)
 782                return 0;
 783
 784        /* ib_base is only set for dGPU */
 785        ret = kfd_process_alloc_gpuvm(pdd, qpd->ib_base, PAGE_SIZE, flags,
 786                                      &kaddr);
 787        if (ret)
 788                return ret;
 789
 790        qpd->ib_kaddr = kaddr;
 791
 792        return 0;
 793}
 794
 795struct kfd_process *kfd_create_process(struct file *filep)
 796{
 797        struct kfd_process *process;
 798        struct task_struct *thread = current;
 799        int ret;
 800
 801        if (!thread->mm)
 802                return ERR_PTR(-EINVAL);
 803
 804        /* Only the pthreads threading model is supported. */
 805        if (thread->group_leader->mm != thread->mm)
 806                return ERR_PTR(-EINVAL);
 807
 808        /*
 809         * take kfd processes mutex before starting of process creation
 810         * so there won't be a case where two threads of the same process
 811         * create two kfd_process structures
 812         */
 813        mutex_lock(&kfd_processes_mutex);
 814
 815        /* A prior open of /dev/kfd could have already created the process. */
 816        process = find_process(thread);
 817        if (process) {
 818                pr_debug("Process already found\n");
 819        } else {
 820                process = create_process(thread);
 821                if (IS_ERR(process))
 822                        goto out;
 823
 824                ret = kfd_process_init_cwsr_apu(process, filep);
 825                if (ret)
 826                        goto out_destroy;
 827
 828                if (!procfs.kobj)
 829                        goto out;
 830
 831                process->kobj = kfd_alloc_struct(process->kobj);
 832                if (!process->kobj) {
 833                        pr_warn("Creating procfs kobject failed");
 834                        goto out;
 835                }
 836                ret = kobject_init_and_add(process->kobj, &procfs_type,
 837                                           procfs.kobj, "%d",
 838                                           (int)process->lead_thread->pid);
 839                if (ret) {
 840                        pr_warn("Creating procfs pid directory failed");
 841                        kobject_put(process->kobj);
 842                        goto out;
 843                }
 844
 845                kfd_sysfs_create_file(process->kobj, &process->attr_pasid,
 846                                      "pasid");
 847
 848                process->kobj_queues = kobject_create_and_add("queues",
 849                                                        process->kobj);
 850                if (!process->kobj_queues)
 851                        pr_warn("Creating KFD proc/queues folder failed");
 852
 853                kfd_procfs_add_sysfs_stats(process);
 854                kfd_procfs_add_sysfs_files(process);
 855                kfd_procfs_add_sysfs_counters(process);
 856        }
 857out:
 858        if (!IS_ERR(process))
 859                kref_get(&process->ref);
 860        mutex_unlock(&kfd_processes_mutex);
 861
 862        return process;
 863
 864out_destroy:
 865        hash_del_rcu(&process->kfd_processes);
 866        mutex_unlock(&kfd_processes_mutex);
 867        synchronize_srcu(&kfd_processes_srcu);
 868        /* kfd_process_free_notifier will trigger the cleanup */
 869        mmu_notifier_put(&process->mmu_notifier);
 870        return ERR_PTR(ret);
 871}
 872
 873struct kfd_process *kfd_get_process(const struct task_struct *thread)
 874{
 875        struct kfd_process *process;
 876
 877        if (!thread->mm)
 878                return ERR_PTR(-EINVAL);
 879
 880        /* Only the pthreads threading model is supported. */
 881        if (thread->group_leader->mm != thread->mm)
 882                return ERR_PTR(-EINVAL);
 883
 884        process = find_process(thread);
 885        if (!process)
 886                return ERR_PTR(-EINVAL);
 887
 888        return process;
 889}
 890
 891static struct kfd_process *find_process_by_mm(const struct mm_struct *mm)
 892{
 893        struct kfd_process *process;
 894
 895        hash_for_each_possible_rcu(kfd_processes_table, process,
 896                                        kfd_processes, (uintptr_t)mm)
 897                if (process->mm == mm)
 898                        return process;
 899
 900        return NULL;
 901}
 902
 903static struct kfd_process *find_process(const struct task_struct *thread)
 904{
 905        struct kfd_process *p;
 906        int idx;
 907
 908        idx = srcu_read_lock(&kfd_processes_srcu);
 909        p = find_process_by_mm(thread->mm);
 910        srcu_read_unlock(&kfd_processes_srcu, idx);
 911
 912        return p;
 913}
 914
 915void kfd_unref_process(struct kfd_process *p)
 916{
 917        kref_put(&p->ref, kfd_process_ref_release);
 918}
 919
 920
 921static void kfd_process_device_free_bos(struct kfd_process_device *pdd)
 922{
 923        struct kfd_process *p = pdd->process;
 924        void *mem;
 925        int id;
 926        int i;
 927
 928        /*
 929         * Remove all handles from idr and release appropriate
 930         * local memory object
 931         */
 932        idr_for_each_entry(&pdd->alloc_idr, mem, id) {
 933
 934                for (i = 0; i < p->n_pdds; i++) {
 935                        struct kfd_process_device *peer_pdd = p->pdds[i];
 936
 937                        if (!peer_pdd->drm_priv)
 938                                continue;
 939                        amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
 940                                peer_pdd->dev->kgd, mem, peer_pdd->drm_priv);
 941                }
 942
 943                amdgpu_amdkfd_gpuvm_free_memory_of_gpu(pdd->dev->kgd, mem,
 944                                                       pdd->drm_priv, NULL);
 945                kfd_process_device_remove_obj_handle(pdd, id);
 946        }
 947}
 948
 949static void kfd_process_free_outstanding_kfd_bos(struct kfd_process *p)
 950{
 951        int i;
 952
 953        for (i = 0; i < p->n_pdds; i++)
 954                kfd_process_device_free_bos(p->pdds[i]);
 955}
 956
 957static void kfd_process_destroy_pdds(struct kfd_process *p)
 958{
 959        int i;
 960
 961        for (i = 0; i < p->n_pdds; i++) {
 962                struct kfd_process_device *pdd = p->pdds[i];
 963
 964                pr_debug("Releasing pdd (topology id %d) for process (pasid 0x%x)\n",
 965                                pdd->dev->id, p->pasid);
 966
 967                if (pdd->drm_file) {
 968                        amdgpu_amdkfd_gpuvm_release_process_vm(
 969                                        pdd->dev->kgd, pdd->drm_priv);
 970                        fput(pdd->drm_file);
 971                }
 972
 973                if (pdd->qpd.cwsr_kaddr && !pdd->qpd.cwsr_base)
 974                        free_pages((unsigned long)pdd->qpd.cwsr_kaddr,
 975                                get_order(KFD_CWSR_TBA_TMA_SIZE));
 976
 977                kfree(pdd->qpd.doorbell_bitmap);
 978                idr_destroy(&pdd->alloc_idr);
 979
 980                kfd_free_process_doorbells(pdd->dev, pdd->doorbell_index);
 981
 982                /*
 983                 * before destroying pdd, make sure to report availability
 984                 * for auto suspend
 985                 */
 986                if (pdd->runtime_inuse) {
 987                        pm_runtime_mark_last_busy(pdd->dev->ddev->dev);
 988                        pm_runtime_put_autosuspend(pdd->dev->ddev->dev);
 989                        pdd->runtime_inuse = false;
 990                }
 991
 992                kfree(pdd);
 993                p->pdds[i] = NULL;
 994        }
 995        p->n_pdds = 0;
 996}
 997
 998static void kfd_process_remove_sysfs(struct kfd_process *p)
 999{
1000        struct kfd_process_device *pdd;
1001        int i;
1002
1003        if (!p->kobj)
1004                return;
1005
1006        sysfs_remove_file(p->kobj, &p->attr_pasid);
1007        kobject_del(p->kobj_queues);
1008        kobject_put(p->kobj_queues);
1009        p->kobj_queues = NULL;
1010
1011        for (i = 0; i < p->n_pdds; i++) {
1012                pdd = p->pdds[i];
1013
1014                sysfs_remove_file(p->kobj, &pdd->attr_vram);
1015                sysfs_remove_file(p->kobj, &pdd->attr_sdma);
1016
1017                sysfs_remove_file(pdd->kobj_stats, &pdd->attr_evict);
1018                if (pdd->dev->kfd2kgd->get_cu_occupancy)
1019                        sysfs_remove_file(pdd->kobj_stats,
1020                                          &pdd->attr_cu_occupancy);
1021                kobject_del(pdd->kobj_stats);
1022                kobject_put(pdd->kobj_stats);
1023                pdd->kobj_stats = NULL;
1024        }
1025
1026        for_each_set_bit(i, p->svms.bitmap_supported, p->n_pdds) {
1027                pdd = p->pdds[i];
1028
1029                sysfs_remove_file(pdd->kobj_counters, &pdd->attr_faults);
1030                sysfs_remove_file(pdd->kobj_counters, &pdd->attr_page_in);
1031                sysfs_remove_file(pdd->kobj_counters, &pdd->attr_page_out);
1032                kobject_del(pdd->kobj_counters);
1033                kobject_put(pdd->kobj_counters);
1034                pdd->kobj_counters = NULL;
1035        }
1036
1037        kobject_del(p->kobj);
1038        kobject_put(p->kobj);
1039        p->kobj = NULL;
1040}
1041
1042/* No process locking is needed in this function, because the process
1043 * is not findable any more. We must assume that no other thread is
1044 * using it any more, otherwise we couldn't safely free the process
1045 * structure in the end.
1046 */
1047static void kfd_process_wq_release(struct work_struct *work)
1048{
1049        struct kfd_process *p = container_of(work, struct kfd_process,
1050                                             release_work);
1051        kfd_process_remove_sysfs(p);
1052        kfd_iommu_unbind_process(p);
1053
1054        kfd_process_free_outstanding_kfd_bos(p);
1055        svm_range_list_fini(p);
1056
1057        kfd_process_destroy_pdds(p);
1058        dma_fence_put(p->ef);
1059
1060        kfd_event_free_process(p);
1061
1062        kfd_pasid_free(p->pasid);
1063        mutex_destroy(&p->mutex);
1064
1065        put_task_struct(p->lead_thread);
1066
1067        kfree(p);
1068}
1069
1070static void kfd_process_ref_release(struct kref *ref)
1071{
1072        struct kfd_process *p = container_of(ref, struct kfd_process, ref);
1073
1074        INIT_WORK(&p->release_work, kfd_process_wq_release);
1075        queue_work(kfd_process_wq, &p->release_work);
1076}
1077
1078static struct mmu_notifier *kfd_process_alloc_notifier(struct mm_struct *mm)
1079{
1080        int idx = srcu_read_lock(&kfd_processes_srcu);
1081        struct kfd_process *p = find_process_by_mm(mm);
1082
1083        srcu_read_unlock(&kfd_processes_srcu, idx);
1084
1085        return p ? &p->mmu_notifier : ERR_PTR(-ESRCH);
1086}
1087
1088static void kfd_process_free_notifier(struct mmu_notifier *mn)
1089{
1090        kfd_unref_process(container_of(mn, struct kfd_process, mmu_notifier));
1091}
1092
1093static void kfd_process_notifier_release(struct mmu_notifier *mn,
1094                                        struct mm_struct *mm)
1095{
1096        struct kfd_process *p;
1097        int i;
1098
1099        /*
1100         * The kfd_process structure can not be free because the
1101         * mmu_notifier srcu is read locked
1102         */
1103        p = container_of(mn, struct kfd_process, mmu_notifier);
1104        if (WARN_ON(p->mm != mm))
1105                return;
1106
1107        mutex_lock(&kfd_processes_mutex);
1108        hash_del_rcu(&p->kfd_processes);
1109        mutex_unlock(&kfd_processes_mutex);
1110        synchronize_srcu(&kfd_processes_srcu);
1111
1112        cancel_delayed_work_sync(&p->eviction_work);
1113        cancel_delayed_work_sync(&p->restore_work);
1114        cancel_delayed_work_sync(&p->svms.restore_work);
1115
1116        mutex_lock(&p->mutex);
1117
1118        /* Iterate over all process device data structures and if the
1119         * pdd is in debug mode, we should first force unregistration,
1120         * then we will be able to destroy the queues
1121         */
1122        for (i = 0; i < p->n_pdds; i++) {
1123                struct kfd_dev *dev = p->pdds[i]->dev;
1124
1125                mutex_lock(kfd_get_dbgmgr_mutex());
1126                if (dev && dev->dbgmgr && dev->dbgmgr->pasid == p->pasid) {
1127                        if (!kfd_dbgmgr_unregister(dev->dbgmgr, p)) {
1128                                kfd_dbgmgr_destroy(dev->dbgmgr);
1129                                dev->dbgmgr = NULL;
1130                        }
1131                }
1132                mutex_unlock(kfd_get_dbgmgr_mutex());
1133        }
1134
1135        kfd_process_dequeue_from_all_devices(p);
1136        pqm_uninit(&p->pqm);
1137
1138        /* Indicate to other users that MM is no longer valid */
1139        p->mm = NULL;
1140        /* Signal the eviction fence after user mode queues are
1141         * destroyed. This allows any BOs to be freed without
1142         * triggering pointless evictions or waiting for fences.
1143         */
1144        dma_fence_signal(p->ef);
1145
1146        mutex_unlock(&p->mutex);
1147
1148        mmu_notifier_put(&p->mmu_notifier);
1149}
1150
1151static const struct mmu_notifier_ops kfd_process_mmu_notifier_ops = {
1152        .release = kfd_process_notifier_release,
1153        .alloc_notifier = kfd_process_alloc_notifier,
1154        .free_notifier = kfd_process_free_notifier,
1155};
1156
1157static int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep)
1158{
1159        unsigned long  offset;
1160        int i;
1161
1162        for (i = 0; i < p->n_pdds; i++) {
1163                struct kfd_dev *dev = p->pdds[i]->dev;
1164                struct qcm_process_device *qpd = &p->pdds[i]->qpd;
1165
1166                if (!dev->cwsr_enabled || qpd->cwsr_kaddr || qpd->cwsr_base)
1167                        continue;
1168
1169                offset = KFD_MMAP_TYPE_RESERVED_MEM | KFD_MMAP_GPU_ID(dev->id);
1170                qpd->tba_addr = (int64_t)vm_mmap(filep, 0,
1171                        KFD_CWSR_TBA_TMA_SIZE, PROT_READ | PROT_EXEC,
1172                        MAP_SHARED, offset);
1173
1174                if (IS_ERR_VALUE(qpd->tba_addr)) {
1175                        int err = qpd->tba_addr;
1176
1177                        pr_err("Failure to set tba address. error %d.\n", err);
1178                        qpd->tba_addr = 0;
1179                        qpd->cwsr_kaddr = NULL;
1180                        return err;
1181                }
1182
1183                memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
1184
1185                qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
1186                pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
1187                        qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
1188        }
1189
1190        return 0;
1191}
1192
1193static int kfd_process_device_init_cwsr_dgpu(struct kfd_process_device *pdd)
1194{
1195        struct kfd_dev *dev = pdd->dev;
1196        struct qcm_process_device *qpd = &pdd->qpd;
1197        uint32_t flags = KFD_IOC_ALLOC_MEM_FLAGS_GTT
1198                        | KFD_IOC_ALLOC_MEM_FLAGS_NO_SUBSTITUTE
1199                        | KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE;
1200        void *kaddr;
1201        int ret;
1202
1203        if (!dev->cwsr_enabled || qpd->cwsr_kaddr || !qpd->cwsr_base)
1204                return 0;
1205
1206        /* cwsr_base is only set for dGPU */
1207        ret = kfd_process_alloc_gpuvm(pdd, qpd->cwsr_base,
1208                                      KFD_CWSR_TBA_TMA_SIZE, flags, &kaddr);
1209        if (ret)
1210                return ret;
1211
1212        qpd->cwsr_kaddr = kaddr;
1213        qpd->tba_addr = qpd->cwsr_base;
1214
1215        memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
1216
1217        qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
1218        pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
1219                 qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
1220
1221        return 0;
1222}
1223
1224void kfd_process_set_trap_handler(struct qcm_process_device *qpd,
1225                                  uint64_t tba_addr,
1226                                  uint64_t tma_addr)
1227{
1228        if (qpd->cwsr_kaddr) {
1229                /* KFD trap handler is bound, record as second-level TBA/TMA
1230                 * in first-level TMA. First-level trap will jump to second.
1231                 */
1232                uint64_t *tma =
1233                        (uint64_t *)(qpd->cwsr_kaddr + KFD_CWSR_TMA_OFFSET);
1234                tma[0] = tba_addr;
1235                tma[1] = tma_addr;
1236        } else {
1237                /* No trap handler bound, bind as first-level TBA/TMA. */
1238                qpd->tba_addr = tba_addr;
1239                qpd->tma_addr = tma_addr;
1240        }
1241}
1242
1243bool kfd_process_xnack_mode(struct kfd_process *p, bool supported)
1244{
1245        int i;
1246
1247        /* On most GFXv9 GPUs, the retry mode in the SQ must match the
1248         * boot time retry setting. Mixing processes with different
1249         * XNACK/retry settings can hang the GPU.
1250         *
1251         * Different GPUs can have different noretry settings depending
1252         * on HW bugs or limitations. We need to find at least one
1253         * XNACK mode for this process that's compatible with all GPUs.
1254         * Fortunately GPUs with retry enabled (noretry=0) can run code
1255         * built for XNACK-off. On GFXv9 it may perform slower.
1256         *
1257         * Therefore applications built for XNACK-off can always be
1258         * supported and will be our fallback if any GPU does not
1259         * support retry.
1260         */
1261        for (i = 0; i < p->n_pdds; i++) {
1262                struct kfd_dev *dev = p->pdds[i]->dev;
1263
1264                /* Only consider GFXv9 and higher GPUs. Older GPUs don't
1265                 * support the SVM APIs and don't need to be considered
1266                 * for the XNACK mode selection.
1267                 */
1268                if (dev->device_info->asic_family < CHIP_VEGA10)
1269                        continue;
1270                /* Aldebaran can always support XNACK because it can support
1271                 * per-process XNACK mode selection. But let the dev->noretry
1272                 * setting still influence the default XNACK mode.
1273                 */
1274                if (supported &&
1275                    dev->device_info->asic_family == CHIP_ALDEBARAN)
1276                        continue;
1277
1278                /* GFXv10 and later GPUs do not support shader preemption
1279                 * during page faults. This can lead to poor QoS for queue
1280                 * management and memory-manager-related preemptions or
1281                 * even deadlocks.
1282                 */
1283                if (dev->device_info->asic_family >= CHIP_NAVI10)
1284                        return false;
1285
1286                if (dev->noretry)
1287                        return false;
1288        }
1289
1290        return true;
1291}
1292
1293/*
1294 * On return the kfd_process is fully operational and will be freed when the
1295 * mm is released
1296 */
1297static struct kfd_process *create_process(const struct task_struct *thread)
1298{
1299        struct kfd_process *process;
1300        struct mmu_notifier *mn;
1301        int err = -ENOMEM;
1302
1303        process = kzalloc(sizeof(*process), GFP_KERNEL);
1304        if (!process)
1305                goto err_alloc_process;
1306
1307        kref_init(&process->ref);
1308        mutex_init(&process->mutex);
1309        process->mm = thread->mm;
1310        process->lead_thread = thread->group_leader;
1311        process->n_pdds = 0;
1312        INIT_DELAYED_WORK(&process->eviction_work, evict_process_worker);
1313        INIT_DELAYED_WORK(&process->restore_work, restore_process_worker);
1314        process->last_restore_timestamp = get_jiffies_64();
1315        kfd_event_init_process(process);
1316        process->is_32bit_user_mode = in_compat_syscall();
1317
1318        process->pasid = kfd_pasid_alloc();
1319        if (process->pasid == 0)
1320                goto err_alloc_pasid;
1321
1322        err = pqm_init(&process->pqm, process);
1323        if (err != 0)
1324                goto err_process_pqm_init;
1325
1326        /* init process apertures*/
1327        err = kfd_init_apertures(process);
1328        if (err != 0)
1329                goto err_init_apertures;
1330
1331        /* Check XNACK support after PDDs are created in kfd_init_apertures */
1332        process->xnack_enabled = kfd_process_xnack_mode(process, false);
1333
1334        err = svm_range_list_init(process);
1335        if (err)
1336                goto err_init_svm_range_list;
1337
1338        /* alloc_notifier needs to find the process in the hash table */
1339        hash_add_rcu(kfd_processes_table, &process->kfd_processes,
1340                        (uintptr_t)process->mm);
1341
1342        /* MMU notifier registration must be the last call that can fail
1343         * because after this point we cannot unwind the process creation.
1344         * After this point, mmu_notifier_put will trigger the cleanup by
1345         * dropping the last process reference in the free_notifier.
1346         */
1347        mn = mmu_notifier_get(&kfd_process_mmu_notifier_ops, process->mm);
1348        if (IS_ERR(mn)) {
1349                err = PTR_ERR(mn);
1350                goto err_register_notifier;
1351        }
1352        BUG_ON(mn != &process->mmu_notifier);
1353
1354        get_task_struct(process->lead_thread);
1355
1356        return process;
1357
1358err_register_notifier:
1359        hash_del_rcu(&process->kfd_processes);
1360        svm_range_list_fini(process);
1361err_init_svm_range_list:
1362        kfd_process_free_outstanding_kfd_bos(process);
1363        kfd_process_destroy_pdds(process);
1364err_init_apertures:
1365        pqm_uninit(&process->pqm);
1366err_process_pqm_init:
1367        kfd_pasid_free(process->pasid);
1368err_alloc_pasid:
1369        mutex_destroy(&process->mutex);
1370        kfree(process);
1371err_alloc_process:
1372        return ERR_PTR(err);
1373}
1374
1375static int init_doorbell_bitmap(struct qcm_process_device *qpd,
1376                        struct kfd_dev *dev)
1377{
1378        unsigned int i;
1379        int range_start = dev->shared_resources.non_cp_doorbells_start;
1380        int range_end = dev->shared_resources.non_cp_doorbells_end;
1381
1382        if (!KFD_IS_SOC15(dev->device_info->asic_family))
1383                return 0;
1384
1385        qpd->doorbell_bitmap =
1386                kzalloc(DIV_ROUND_UP(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
1387                                     BITS_PER_BYTE), GFP_KERNEL);
1388        if (!qpd->doorbell_bitmap)
1389                return -ENOMEM;
1390
1391        /* Mask out doorbells reserved for SDMA, IH, and VCN on SOC15. */
1392        pr_debug("reserved doorbell 0x%03x - 0x%03x\n", range_start, range_end);
1393        pr_debug("reserved doorbell 0x%03x - 0x%03x\n",
1394                        range_start + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,
1395                        range_end + KFD_QUEUE_DOORBELL_MIRROR_OFFSET);
1396
1397        for (i = 0; i < KFD_MAX_NUM_OF_QUEUES_PER_PROCESS / 2; i++) {
1398                if (i >= range_start && i <= range_end) {
1399                        set_bit(i, qpd->doorbell_bitmap);
1400                        set_bit(i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,
1401                                qpd->doorbell_bitmap);
1402                }
1403        }
1404
1405        return 0;
1406}
1407
1408struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev,
1409                                                        struct kfd_process *p)
1410{
1411        int i;
1412
1413        for (i = 0; i < p->n_pdds; i++)
1414                if (p->pdds[i]->dev == dev)
1415                        return p->pdds[i];
1416
1417        return NULL;
1418}
1419
1420struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
1421                                                        struct kfd_process *p)
1422{
1423        struct kfd_process_device *pdd = NULL;
1424
1425        if (WARN_ON_ONCE(p->n_pdds >= MAX_GPU_INSTANCE))
1426                return NULL;
1427        pdd = kzalloc(sizeof(*pdd), GFP_KERNEL);
1428        if (!pdd)
1429                return NULL;
1430
1431        if (kfd_alloc_process_doorbells(dev, &pdd->doorbell_index) < 0) {
1432                pr_err("Failed to alloc doorbell for pdd\n");
1433                goto err_free_pdd;
1434        }
1435
1436        if (init_doorbell_bitmap(&pdd->qpd, dev)) {
1437                pr_err("Failed to init doorbell for process\n");
1438                goto err_free_pdd;
1439        }
1440
1441        pdd->dev = dev;
1442        INIT_LIST_HEAD(&pdd->qpd.queues_list);
1443        INIT_LIST_HEAD(&pdd->qpd.priv_queue_list);
1444        pdd->qpd.dqm = dev->dqm;
1445        pdd->qpd.pqm = &p->pqm;
1446        pdd->qpd.evicted = 0;
1447        pdd->qpd.mapped_gws_queue = false;
1448        pdd->process = p;
1449        pdd->bound = PDD_UNBOUND;
1450        pdd->already_dequeued = false;
1451        pdd->runtime_inuse = false;
1452        pdd->vram_usage = 0;
1453        pdd->sdma_past_activity_counter = 0;
1454        atomic64_set(&pdd->evict_duration_counter, 0);
1455        p->pdds[p->n_pdds++] = pdd;
1456
1457        /* Init idr used for memory handle translation */
1458        idr_init(&pdd->alloc_idr);
1459
1460        return pdd;
1461
1462err_free_pdd:
1463        kfree(pdd);
1464        return NULL;
1465}
1466
1467/**
1468 * kfd_process_device_init_vm - Initialize a VM for a process-device
1469 *
1470 * @pdd: The process-device
1471 * @drm_file: Optional pointer to a DRM file descriptor
1472 *
1473 * If @drm_file is specified, it will be used to acquire the VM from
1474 * that file descriptor. If successful, the @pdd takes ownership of
1475 * the file descriptor.
1476 *
1477 * If @drm_file is NULL, a new VM is created.
1478 *
1479 * Returns 0 on success, -errno on failure.
1480 */
1481int kfd_process_device_init_vm(struct kfd_process_device *pdd,
1482                               struct file *drm_file)
1483{
1484        struct kfd_process *p;
1485        struct kfd_dev *dev;
1486        int ret;
1487
1488        if (!drm_file)
1489                return -EINVAL;
1490
1491        if (pdd->drm_priv)
1492                return -EBUSY;
1493
1494        p = pdd->process;
1495        dev = pdd->dev;
1496
1497        ret = amdgpu_amdkfd_gpuvm_acquire_process_vm(
1498                dev->kgd, drm_file, p->pasid,
1499                &p->kgd_process_info, &p->ef);
1500        if (ret) {
1501                pr_err("Failed to create process VM object\n");
1502                return ret;
1503        }
1504        pdd->drm_priv = drm_file->private_data;
1505
1506        ret = kfd_process_device_reserve_ib_mem(pdd);
1507        if (ret)
1508                goto err_reserve_ib_mem;
1509        ret = kfd_process_device_init_cwsr_dgpu(pdd);
1510        if (ret)
1511                goto err_init_cwsr;
1512
1513        pdd->drm_file = drm_file;
1514
1515        return 0;
1516
1517err_init_cwsr:
1518err_reserve_ib_mem:
1519        kfd_process_device_free_bos(pdd);
1520        pdd->drm_priv = NULL;
1521
1522        return ret;
1523}
1524
1525/*
1526 * Direct the IOMMU to bind the process (specifically the pasid->mm)
1527 * to the device.
1528 * Unbinding occurs when the process dies or the device is removed.
1529 *
1530 * Assumes that the process lock is held.
1531 */
1532struct kfd_process_device *kfd_bind_process_to_device(struct kfd_dev *dev,
1533                                                        struct kfd_process *p)
1534{
1535        struct kfd_process_device *pdd;
1536        int err;
1537
1538        pdd = kfd_get_process_device_data(dev, p);
1539        if (!pdd) {
1540                pr_err("Process device data doesn't exist\n");
1541                return ERR_PTR(-ENOMEM);
1542        }
1543
1544        if (!pdd->drm_priv)
1545                return ERR_PTR(-ENODEV);
1546
1547        /*
1548         * signal runtime-pm system to auto resume and prevent
1549         * further runtime suspend once device pdd is created until
1550         * pdd is destroyed.
1551         */
1552        if (!pdd->runtime_inuse) {
1553                err = pm_runtime_get_sync(dev->ddev->dev);
1554                if (err < 0) {
1555                        pm_runtime_put_autosuspend(dev->ddev->dev);
1556                        return ERR_PTR(err);
1557                }
1558        }
1559
1560        err = kfd_iommu_bind_process_to_device(pdd);
1561        if (err)
1562                goto out;
1563
1564        /*
1565         * make sure that runtime_usage counter is incremented just once
1566         * per pdd
1567         */
1568        pdd->runtime_inuse = true;
1569
1570        return pdd;
1571
1572out:
1573        /* balance runpm reference count and exit with error */
1574        if (!pdd->runtime_inuse) {
1575                pm_runtime_mark_last_busy(dev->ddev->dev);
1576                pm_runtime_put_autosuspend(dev->ddev->dev);
1577        }
1578
1579        return ERR_PTR(err);
1580}
1581
1582/* Create specific handle mapped to mem from process local memory idr
1583 * Assumes that the process lock is held.
1584 */
1585int kfd_process_device_create_obj_handle(struct kfd_process_device *pdd,
1586                                        void *mem)
1587{
1588        return idr_alloc(&pdd->alloc_idr, mem, 0, 0, GFP_KERNEL);
1589}
1590
1591/* Translate specific handle from process local memory idr
1592 * Assumes that the process lock is held.
1593 */
1594void *kfd_process_device_translate_handle(struct kfd_process_device *pdd,
1595                                        int handle)
1596{
1597        if (handle < 0)
1598                return NULL;
1599
1600        return idr_find(&pdd->alloc_idr, handle);
1601}
1602
1603/* Remove specific handle from process local memory idr
1604 * Assumes that the process lock is held.
1605 */
1606void kfd_process_device_remove_obj_handle(struct kfd_process_device *pdd,
1607                                        int handle)
1608{
1609        if (handle >= 0)
1610                idr_remove(&pdd->alloc_idr, handle);
1611}
1612
1613/* This increments the process->ref counter. */
1614struct kfd_process *kfd_lookup_process_by_pasid(u32 pasid)
1615{
1616        struct kfd_process *p, *ret_p = NULL;
1617        unsigned int temp;
1618
1619        int idx = srcu_read_lock(&kfd_processes_srcu);
1620
1621        hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1622                if (p->pasid == pasid) {
1623                        kref_get(&p->ref);
1624                        ret_p = p;
1625                        break;
1626                }
1627        }
1628
1629        srcu_read_unlock(&kfd_processes_srcu, idx);
1630
1631        return ret_p;
1632}
1633
1634/* This increments the process->ref counter. */
1635struct kfd_process *kfd_lookup_process_by_mm(const struct mm_struct *mm)
1636{
1637        struct kfd_process *p;
1638
1639        int idx = srcu_read_lock(&kfd_processes_srcu);
1640
1641        p = find_process_by_mm(mm);
1642        if (p)
1643                kref_get(&p->ref);
1644
1645        srcu_read_unlock(&kfd_processes_srcu, idx);
1646
1647        return p;
1648}
1649
1650/* kfd_process_evict_queues - Evict all user queues of a process
1651 *
1652 * Eviction is reference-counted per process-device. This means multiple
1653 * evictions from different sources can be nested safely.
1654 */
1655int kfd_process_evict_queues(struct kfd_process *p)
1656{
1657        int r = 0;
1658        int i;
1659        unsigned int n_evicted = 0;
1660
1661        for (i = 0; i < p->n_pdds; i++) {
1662                struct kfd_process_device *pdd = p->pdds[i];
1663
1664                r = pdd->dev->dqm->ops.evict_process_queues(pdd->dev->dqm,
1665                                                            &pdd->qpd);
1666                if (r) {
1667                        pr_err("Failed to evict process queues\n");
1668                        goto fail;
1669                }
1670                n_evicted++;
1671        }
1672
1673        return r;
1674
1675fail:
1676        /* To keep state consistent, roll back partial eviction by
1677         * restoring queues
1678         */
1679        for (i = 0; i < p->n_pdds; i++) {
1680                struct kfd_process_device *pdd = p->pdds[i];
1681
1682                if (n_evicted == 0)
1683                        break;
1684                if (pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm,
1685                                                              &pdd->qpd))
1686                        pr_err("Failed to restore queues\n");
1687
1688                n_evicted--;
1689        }
1690
1691        return r;
1692}
1693
1694/* kfd_process_restore_queues - Restore all user queues of a process */
1695int kfd_process_restore_queues(struct kfd_process *p)
1696{
1697        int r, ret = 0;
1698        int i;
1699
1700        for (i = 0; i < p->n_pdds; i++) {
1701                struct kfd_process_device *pdd = p->pdds[i];
1702
1703                r = pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm,
1704                                                              &pdd->qpd);
1705                if (r) {
1706                        pr_err("Failed to restore process queues\n");
1707                        if (!ret)
1708                                ret = r;
1709                }
1710        }
1711
1712        return ret;
1713}
1714
1715int kfd_process_gpuidx_from_gpuid(struct kfd_process *p, uint32_t gpu_id)
1716{
1717        int i;
1718
1719        for (i = 0; i < p->n_pdds; i++)
1720                if (p->pdds[i] && gpu_id == p->pdds[i]->dev->id)
1721                        return i;
1722        return -EINVAL;
1723}
1724
1725int
1726kfd_process_gpuid_from_kgd(struct kfd_process *p, struct amdgpu_device *adev,
1727                           uint32_t *gpuid, uint32_t *gpuidx)
1728{
1729        struct kgd_dev *kgd = (struct kgd_dev *)adev;
1730        int i;
1731
1732        for (i = 0; i < p->n_pdds; i++)
1733                if (p->pdds[i] && p->pdds[i]->dev->kgd == kgd) {
1734                        *gpuid = p->pdds[i]->dev->id;
1735                        *gpuidx = i;
1736                        return 0;
1737                }
1738        return -EINVAL;
1739}
1740
1741static void evict_process_worker(struct work_struct *work)
1742{
1743        int ret;
1744        struct kfd_process *p;
1745        struct delayed_work *dwork;
1746
1747        dwork = to_delayed_work(work);
1748
1749        /* Process termination destroys this worker thread. So during the
1750         * lifetime of this thread, kfd_process p will be valid
1751         */
1752        p = container_of(dwork, struct kfd_process, eviction_work);
1753        WARN_ONCE(p->last_eviction_seqno != p->ef->seqno,
1754                  "Eviction fence mismatch\n");
1755
1756        /* Narrow window of overlap between restore and evict work
1757         * item is possible. Once amdgpu_amdkfd_gpuvm_restore_process_bos
1758         * unreserves KFD BOs, it is possible to evicted again. But
1759         * restore has few more steps of finish. So lets wait for any
1760         * previous restore work to complete
1761         */
1762        flush_delayed_work(&p->restore_work);
1763
1764        pr_debug("Started evicting pasid 0x%x\n", p->pasid);
1765        ret = kfd_process_evict_queues(p);
1766        if (!ret) {
1767                dma_fence_signal(p->ef);
1768                dma_fence_put(p->ef);
1769                p->ef = NULL;
1770                queue_delayed_work(kfd_restore_wq, &p->restore_work,
1771                                msecs_to_jiffies(PROCESS_RESTORE_TIME_MS));
1772
1773                pr_debug("Finished evicting pasid 0x%x\n", p->pasid);
1774        } else
1775                pr_err("Failed to evict queues of pasid 0x%x\n", p->pasid);
1776}
1777
1778static void restore_process_worker(struct work_struct *work)
1779{
1780        struct delayed_work *dwork;
1781        struct kfd_process *p;
1782        int ret = 0;
1783
1784        dwork = to_delayed_work(work);
1785
1786        /* Process termination destroys this worker thread. So during the
1787         * lifetime of this thread, kfd_process p will be valid
1788         */
1789        p = container_of(dwork, struct kfd_process, restore_work);
1790        pr_debug("Started restoring pasid 0x%x\n", p->pasid);
1791
1792        /* Setting last_restore_timestamp before successful restoration.
1793         * Otherwise this would have to be set by KGD (restore_process_bos)
1794         * before KFD BOs are unreserved. If not, the process can be evicted
1795         * again before the timestamp is set.
1796         * If restore fails, the timestamp will be set again in the next
1797         * attempt. This would mean that the minimum GPU quanta would be
1798         * PROCESS_ACTIVE_TIME_MS - (time to execute the following two
1799         * functions)
1800         */
1801
1802        p->last_restore_timestamp = get_jiffies_64();
1803        ret = amdgpu_amdkfd_gpuvm_restore_process_bos(p->kgd_process_info,
1804                                                     &p->ef);
1805        if (ret) {
1806                pr_debug("Failed to restore BOs of pasid 0x%x, retry after %d ms\n",
1807                         p->pasid, PROCESS_BACK_OFF_TIME_MS);
1808                ret = queue_delayed_work(kfd_restore_wq, &p->restore_work,
1809                                msecs_to_jiffies(PROCESS_BACK_OFF_TIME_MS));
1810                WARN(!ret, "reschedule restore work failed\n");
1811                return;
1812        }
1813
1814        ret = kfd_process_restore_queues(p);
1815        if (!ret)
1816                pr_debug("Finished restoring pasid 0x%x\n", p->pasid);
1817        else
1818                pr_err("Failed to restore queues of pasid 0x%x\n", p->pasid);
1819}
1820
1821void kfd_suspend_all_processes(void)
1822{
1823        struct kfd_process *p;
1824        unsigned int temp;
1825        int idx = srcu_read_lock(&kfd_processes_srcu);
1826
1827        WARN(debug_evictions, "Evicting all processes");
1828        hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1829                cancel_delayed_work_sync(&p->eviction_work);
1830                cancel_delayed_work_sync(&p->restore_work);
1831
1832                if (kfd_process_evict_queues(p))
1833                        pr_err("Failed to suspend process 0x%x\n", p->pasid);
1834                dma_fence_signal(p->ef);
1835                dma_fence_put(p->ef);
1836                p->ef = NULL;
1837        }
1838        srcu_read_unlock(&kfd_processes_srcu, idx);
1839}
1840
1841int kfd_resume_all_processes(void)
1842{
1843        struct kfd_process *p;
1844        unsigned int temp;
1845        int ret = 0, idx = srcu_read_lock(&kfd_processes_srcu);
1846
1847        hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1848                if (!queue_delayed_work(kfd_restore_wq, &p->restore_work, 0)) {
1849                        pr_err("Restore process %d failed during resume\n",
1850                               p->pasid);
1851                        ret = -EFAULT;
1852                }
1853        }
1854        srcu_read_unlock(&kfd_processes_srcu, idx);
1855        return ret;
1856}
1857
1858int kfd_reserved_mem_mmap(struct kfd_dev *dev, struct kfd_process *process,
1859                          struct vm_area_struct *vma)
1860{
1861        struct kfd_process_device *pdd;
1862        struct qcm_process_device *qpd;
1863
1864        if ((vma->vm_end - vma->vm_start) != KFD_CWSR_TBA_TMA_SIZE) {
1865                pr_err("Incorrect CWSR mapping size.\n");
1866                return -EINVAL;
1867        }
1868
1869        pdd = kfd_get_process_device_data(dev, process);
1870        if (!pdd)
1871                return -EINVAL;
1872        qpd = &pdd->qpd;
1873
1874        qpd->cwsr_kaddr = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
1875                                        get_order(KFD_CWSR_TBA_TMA_SIZE));
1876        if (!qpd->cwsr_kaddr) {
1877                pr_err("Error allocating per process CWSR buffer.\n");
1878                return -ENOMEM;
1879        }
1880
1881        vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND
1882                | VM_NORESERVE | VM_DONTDUMP | VM_PFNMAP;
1883        /* Mapping pages to user process */
1884        return remap_pfn_range(vma, vma->vm_start,
1885                               PFN_DOWN(__pa(qpd->cwsr_kaddr)),
1886                               KFD_CWSR_TBA_TMA_SIZE, vma->vm_page_prot);
1887}
1888
1889void kfd_flush_tlb(struct kfd_process_device *pdd, enum TLB_FLUSH_TYPE type)
1890{
1891        struct kfd_dev *dev = pdd->dev;
1892
1893        if (dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS) {
1894                /* Nothing to flush until a VMID is assigned, which
1895                 * only happens when the first queue is created.
1896                 */
1897                if (pdd->qpd.vmid)
1898                        amdgpu_amdkfd_flush_gpu_tlb_vmid(dev->kgd,
1899                                                        pdd->qpd.vmid);
1900        } else {
1901                amdgpu_amdkfd_flush_gpu_tlb_pasid(dev->kgd,
1902                                        pdd->process->pasid, type);
1903        }
1904}
1905
1906#if defined(CONFIG_DEBUG_FS)
1907
1908int kfd_debugfs_mqds_by_process(struct seq_file *m, void *data)
1909{
1910        struct kfd_process *p;
1911        unsigned int temp;
1912        int r = 0;
1913
1914        int idx = srcu_read_lock(&kfd_processes_srcu);
1915
1916        hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1917                seq_printf(m, "Process %d PASID 0x%x:\n",
1918                           p->lead_thread->tgid, p->pasid);
1919
1920                mutex_lock(&p->mutex);
1921                r = pqm_debugfs_mqds(m, &p->pqm);
1922                mutex_unlock(&p->mutex);
1923
1924                if (r)
1925                        break;
1926        }
1927
1928        srcu_read_unlock(&kfd_processes_srcu, idx);
1929
1930        return r;
1931}
1932
1933#endif
1934
1935
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