tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * SPDX-License-Identifier: MIT
3 *
4 * Copyright © 2019 Intel Corporation
5 */
6
7#include "i915_drv.h"
8#include "i915_gem_object.h"
9
10struct stub_fence {
11 struct dma_fence dma;
12 struct i915_sw_fence chain;
13};
14
15static int __i915_sw_fence_call
16stub_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
17{
18 struct stub_fence *stub = container_of(fence, typeof(*stub), chain);
19
20 switch (state) {
21 case FENCE_COMPLETE:
22 dma_fence_signal(&stub->dma);
23 break;
24
25 case FENCE_FREE:
26 dma_fence_put(&stub->dma);
27 break;
28 }
29
30 return NOTIFY_DONE;
31}
32
33static const char *stub_driver_name(struct dma_fence *fence)
34{
35 return DRIVER_NAME;
36}
37
38static const char *stub_timeline_name(struct dma_fence *fence)
39{
40 return "object";
41}
42
43static void stub_release(struct dma_fence *fence)
44{
45 struct stub_fence *stub = container_of(fence, typeof(*stub), dma);
46
47 i915_sw_fence_fini(&stub->chain);
48
49 BUILD_BUG_ON(offsetof(typeof(*stub), dma));
50 dma_fence_free(&stub->dma);
51}
52
53static const struct dma_fence_ops stub_fence_ops = {
54 .get_driver_name = stub_driver_name,
55 .get_timeline_name = stub_timeline_name,
56 .release = stub_release,
57};
58
59struct dma_fence *
60i915_gem_object_lock_fence(struct drm_i915_gem_object *obj)
61{
62 struct stub_fence *stub;
63
64 assert_object_held(obj);
65
66 stub = kmalloc(sizeof(*stub), GFP_KERNEL);
67 if (!stub)
68 return NULL;
69
70 i915_sw_fence_init(&stub->chain, stub_notify);
71 dma_fence_init(&stub->dma, &stub_fence_ops, &stub->chain.wait.lock,
72 0, 0);
73
74 if (i915_sw_fence_await_reservation(&stub->chain,
75 obj->base.resv, NULL,
76 true, I915_FENCE_TIMEOUT,
77 I915_FENCE_GFP) < 0)
78 goto err;
79
80 dma_resv_add_excl_fence(obj->base.resv, &stub->dma);
81
82 return &stub->dma;
83
84err:
85 stub_release(&stub->dma);
86 return NULL;
87}
88
89void i915_gem_object_unlock_fence(struct drm_i915_gem_object *obj,
90 struct dma_fence *fence)
91{
92 struct stub_fence *stub = container_of(fence, typeof(*stub), dma);
93
94 i915_sw_fence_commit(&stub->chain);
95}