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
  20         f->ops->work(f);
  21
  22         fence_complete(f);
  23         dma_fence_put(&f->dma);
  24 }
  25
  26 static int
  27 fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
  28 {
  29         struct dma_fence_work *f = container_of(fence, typeof(*f), chain);
  30
  31         switch (state) {
  32         case FENCE_COMPLETE:
  33                 if (fence->error)
  34                         dma_fence_set_error(&f->dma, fence->error);
  35
  36                 if (!f->dma.error) {
  37                         dma_fence_get(&f->dma);
  38                         if (test_bit(DMA_FENCE_WORK_IMM, &f->dma.flags))
  39                                 fence_work(&f->work);
  40                         else
  41                                 queue_work(system_unbound_wq, &f->work);
  42                 } else {
  43                         fence_complete(f);
  44                 }
  45                 break;
  46
  47         case FENCE_FREE:
  48                 dma_fence_put(&f->dma);
  49                 break;
  50         }
  51
  52         return NOTIFY_DONE;
  53 }
  54
  55 static const char *get_driver_name(struct dma_fence *fence)
  56 {
  57         return "dma-fence";
  58 }
  59
  60 static const char *get_timeline_name(struct dma_fence *fence)
  61 {
  62         struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
  63
  64         return f->ops->name ?: "work";
  65 }
  66
  67 static void fence_release(struct dma_fence *fence)
  68 {
  69         struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
  70
  71         i915_sw_fence_fini(&f->chain);
  72
  73         BUILD_BUG_ON(offsetof(typeof(*f), dma));
  74         dma_fence_free(&f->dma);
  75 }
  76
  77 static const struct dma_fence_ops fence_ops = {
  78         .get_driver_name = get_driver_name,
  79         .get_timeline_name = get_timeline_name,
  80         .release = fence_release,
  81 };
  82
  83 void dma_fence_work_init(struct dma_fence_work *f,
  84                          const struct dma_fence_work_ops *ops)
  85 {
  86         f->ops = ops;
  87         spin_lock_init(&f->lock);
  88         dma_fence_init(&f->dma, &fence_ops, &f->lock, 0, 0);
  89         i915_sw_fence_init(&f->chain, fence_notify);
  90         INIT_WORK(&f->work, fence_work);
  91 }
  92
  93 int dma_fence_work_chain(struct dma_fence_work *f, struct dma_fence *signal)
  94 {
  95         if (!signal)
  96                 return 0;
  97
  98         return __i915_sw_fence_await_dma_fence(&f->chain, signal, &f->cb);
  99 }