drivers/gpu/drm/i915/i915_sw_fence_work.c

   1 // SPDX-License-Identifier: MIT
   2
   3 /*
   4  * Copyright © 2019 Intel Corporation
   5  */
   6
   7 #include "i915_sw_fence_work.h"
   8
   9 static 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
  16 static 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
  29 static int __i915_sw_fence_call
  30 fence_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
  58 static const char *get_driver_name(struct dma_fence *fence)
  59 {
  60         return "dma-fence";
  61 }
  62
  63 static 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
  70 static 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
  80 static 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
  86 void 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
  96 int 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 }