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      1 /*	$NetBSD: i915_sw_fence_work.c,v 1.4 2021/12/19 12:13:37 riastradh Exp $	*/
      2 
      3 // SPDX-License-Identifier: MIT
      4 
      5 /*
      6  * Copyright  2019 Intel Corporation
      7  */
      8 
      9 #include <sys/cdefs.h>
     10 __KERNEL_RCSID(0, "$NetBSD: i915_sw_fence_work.c,v 1.4 2021/12/19 12:13:37 riastradh Exp $");
     11 
     12 #include "i915_sw_fence_work.h"
     13 
     14 static void fence_complete(struct dma_fence_work *f)
     15 {
     16 	if (f->ops->release)
     17 		f->ops->release(f);
     18 	dma_fence_signal(&f->dma);
     19 }
     20 
     21 static void fence_work(struct work_struct *work)
     22 {
     23 	struct dma_fence_work *f = container_of(work, typeof(*f), work);
     24 	int err;
     25 
     26 	err = f->ops->work(f);
     27 	if (err)
     28 		dma_fence_set_error(&f->dma, err);
     29 
     30 	fence_complete(f);
     31 	dma_fence_put(&f->dma);
     32 }
     33 
     34 static int __i915_sw_fence_call
     35 fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
     36 {
     37 	struct dma_fence_work *f = container_of(fence, typeof(*f), chain);
     38 
     39 	switch (state) {
     40 	case FENCE_COMPLETE:
     41 		if (fence->error)
     42 			dma_fence_set_error(&f->dma, fence->error);
     43 
     44 		if (!f->dma.error) {
     45 			dma_fence_get(&f->dma);
     46 			queue_work(system_unbound_wq, &f->work);
     47 		} else {
     48 			fence_complete(f);
     49 		}
     50 		break;
     51 
     52 	case FENCE_FREE:
     53 		dma_fence_put(&f->dma);
     54 		break;
     55 	}
     56 
     57 	return NOTIFY_DONE;
     58 }
     59 
     60 static const char *get_driver_name(struct dma_fence *fence)
     61 {
     62 	return "dma-fence";
     63 }
     64 
     65 static const char *get_timeline_name(struct dma_fence *fence)
     66 {
     67 	struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
     68 
     69 	return f->ops->name ?: "work";
     70 }
     71 
     72 static void fence_release(struct dma_fence *fence)
     73 {
     74 	struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
     75 
     76 	i915_sw_fence_fini(&f->chain);
     77 
     78 	BUILD_BUG_ON(offsetof(typeof(*f), dma));
     79 	spin_lock_destroy(&f->lock);
     80 	dma_fence_free(&f->dma);
     81 }
     82 
     83 static const struct dma_fence_ops fence_ops = {
     84 	.get_driver_name = get_driver_name,
     85 	.get_timeline_name = get_timeline_name,
     86 	.release = fence_release,
     87 };
     88 
     89 void dma_fence_work_init(struct dma_fence_work *f,
     90 			 const struct dma_fence_work_ops *ops)
     91 {
     92 	f->ops = ops;
     93 	spin_lock_init(&f->lock);
     94 	dma_fence_init(&f->dma, &fence_ops, &f->lock, 0, 0);
     95 	i915_sw_fence_init(&f->chain, fence_notify);
     96 	INIT_WORK(&f->work, fence_work);
     97 }
     98 
     99 int dma_fence_work_chain(struct dma_fence_work *f, struct dma_fence *signal)
    100 {
    101 	if (!signal)
    102 		return 0;
    103 
    104 	return __i915_sw_fence_await_dma_fence(&f->chain, signal, &f->cb);
    105 }
    106