Quelle  xe_gpu_scheduler.c   Sprache: C

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2023 Intel Corporation
 */

#include "xe_gpu_scheduler.h"

static void xe_sched_process_msg_queue(struct xe_gpu_scheduler *sched)
{
 if (!READ_ONCE(sched->base.pause_submit))
  queue_work(sched->base.submit_wq, &sched->work_process_msg);
}

static void xe_sched_process_msg_queue_if_ready(struct xe_gpu_scheduler *sched)
{
 struct xe_sched_msg *msg;

 xe_sched_msg_lock(sched);
 msg = list_first_entry_or_null(&sched->msgs, struct xe_sched_msg, link);
 if (msg)
  xe_sched_process_msg_queue(sched);
 xe_sched_msg_unlock(sched);
}

static struct xe_sched_msg *
xe_sched_get_msg(struct xe_gpu_scheduler *sched)
{
 struct xe_sched_msg *msg;

 xe_sched_msg_lock(sched);
 msg = list_first_entry_or_null(&sched->msgs,
           struct xe_sched_msg, link);
 if (msg)
  list_del_init(&msg->link);
 xe_sched_msg_unlock(sched);

 return msg;
}

static void xe_sched_process_msg_work(struct work_struct *w)
{
 struct xe_gpu_scheduler *sched =
  container_of(w, struct xe_gpu_scheduler, work_process_msg);
 struct xe_sched_msg *msg;

 if (READ_ONCE(sched->base.pause_submit))
  return;

 msg = xe_sched_get_msg(sched);
 if (msg) {
  sched->ops->process_msg(msg);

  xe_sched_process_msg_queue_if_ready(sched);
 }
}

int xe_sched_init(struct xe_gpu_scheduler *sched,
    const struct drm_sched_backend_ops *ops,
    const struct xe_sched_backend_ops *xe_ops,
    struct workqueue_struct *submit_wq,
    uint32_t hw_submission, unsigned hang_limit,
    long timeout, struct workqueue_struct *timeout_wq,
    atomic_t *score, const char *name,
    struct device *dev)
{
 const struct drm_sched_init_args args = {
  .ops = ops,
  .submit_wq = submit_wq,
  .num_rqs = 1,
  .credit_limit = hw_submission,
  .hang_limit = hang_limit,
  .timeout = timeout,
  .timeout_wq = timeout_wq,
  .score = score,
  .name = name,
  .dev = dev,
 };

 sched->ops = xe_ops;
 INIT_LIST_HEAD(&sched->msgs);
 INIT_WORK(&sched->work_process_msg, xe_sched_process_msg_work);

 return drm_sched_init(&sched->base, &args);
}

void xe_sched_fini(struct xe_gpu_scheduler *sched)
{
 xe_sched_submission_stop(sched);
 drm_sched_fini(&sched->base);
}

void xe_sched_submission_start(struct xe_gpu_scheduler *sched)
{
 drm_sched_wqueue_start(&sched->base);
 queue_work(sched->base.submit_wq, &sched->work_process_msg);
}

void xe_sched_submission_stop(struct xe_gpu_scheduler *sched)
{
 drm_sched_wqueue_stop(&sched->base);
 cancel_work_sync(&sched->work_process_msg);
}

void xe_sched_submission_resume_tdr(struct xe_gpu_scheduler *sched)
{
 drm_sched_resume_timeout(&sched->base, sched->base.timeout);
}

void xe_sched_add_msg(struct xe_gpu_scheduler *sched,
        struct xe_sched_msg *msg)
{
 xe_sched_msg_lock(sched);
 xe_sched_add_msg_locked(sched, msg);
 xe_sched_msg_unlock(sched);
}

void xe_sched_add_msg_locked(struct xe_gpu_scheduler *sched,
        struct xe_sched_msg *msg)
{
 lockdep_assert_held(&sched->base.job_list_lock);

 list_add_tail(&msg->link, &sched->msgs);
 xe_sched_process_msg_queue(sched);
}