linux/drivers/gpu/drm/i915/i915_sw_fence_work.c
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   1// SPDX-License-Identifier: MIT
   2
   3/*
   4 * Copyright © 2019 Intel Corporation
   5 */
   6
   7#include "i915_sw_fence_work.h"
   8
   9static void fence_complete(struct dma_fence_work *f)
  10{
  11        if (f->ops->release)
  12                f->ops->release(f);
  13        dma_fence_signal(&f->dma);
  14}
  15
  16static void fence_work(struct work_struct *work)
  17{
  18        struct dma_fence_work *f = container_of(work, typeof(*f), work);
  19        int err;
  20
  21        err = f->ops->work(f);
  22        if (err)
  23                dma_fence_set_error(&f->dma, err);
  24
  25        fence_complete(f);
  26        dma_fence_put(&f->dma);
  27}
  28
  29static int __i915_sw_fence_call
  30fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
  31{
  32        struct dma_fence_work *f = container_of(fence, typeof(*f), chain);
  33
  34        switch (state) {
  35        case FENCE_COMPLETE:
  36                if (fence->error)
  37                        dma_fence_set_error(&f->dma, fence->error);
  38
  39                if (!f->dma.error) {
  40                        dma_fence_get(&f->dma);
  41                        if (test_bit(DMA_FENCE_WORK_IMM, &f->dma.flags))
  42                                fence_work(&f->work);
  43                        else
  44                                queue_work(system_unbound_wq, &f->work);
  45                } else {
  46                        fence_complete(f);
  47                }
  48                break;
  49
  50        case FENCE_FREE:
  51                dma_fence_put(&f->dma);
  52                break;
  53        }
  54
  55        return NOTIFY_DONE;
  56}
  57
  58static const char *get_driver_name(struct dma_fence *fence)
  59{
  60        return "dma-fence";
  61}
  62
  63static const char *get_timeline_name(struct dma_fence *fence)
  64{
  65        struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
  66
  67        return f->ops->name ?: "work";
  68}
  69
  70static void fence_release(struct dma_fence *fence)
  71{
  72        struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
  73
  74        i915_sw_fence_fini(&f->chain);
  75
  76        BUILD_BUG_ON(offsetof(typeof(*f), dma));
  77        dma_fence_free(&f->dma);
  78}
  79
  80static const struct dma_fence_ops fence_ops = {
  81        .get_driver_name = get_driver_name,
  82        .get_timeline_name = get_timeline_name,
  83        .release = fence_release,
  84};
  85
  86void dma_fence_work_init(struct dma_fence_work *f,
  87                         const struct dma_fence_work_ops *ops)
  88{
  89        f->ops = ops;
  90        spin_lock_init(&f->lock);
  91        dma_fence_init(&f->dma, &fence_ops, &f->lock, 0, 0);
  92        i915_sw_fence_init(&f->chain, fence_notify);
  93        INIT_WORK(&f->work, fence_work);
  94}
  95
  96int dma_fence_work_chain(struct dma_fence_work *f, struct dma_fence *signal)
  97{
  98        if (!signal)
  99                return 0;
 100
 101        return __i915_sw_fence_await_dma_fence(&f->chain, signal, &f->cb);
 102}
 103