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/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2019 Intel Corporation
*/
#include "i915_drv.h"
#include "i915_gem_object.h"
struct stub_fence {
struct dma_fence dma;
struct i915_sw_fence chain;
};
static int __i915_sw_fence_call
stub_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
{
struct stub_fence *stub = container_of(fence, typeof(*stub), chain);
switch (state) {
case FENCE_COMPLETE:
dma_fence_signal(&stub->dma);
break;
case FENCE_FREE:
dma_fence_put(&stub->dma);
break;
}
return NOTIFY_DONE;
}
static const char *stub_driver_name(struct dma_fence *fence)
{
return DRIVER_NAME;
}
static const char *stub_timeline_name(struct dma_fence *fence)
{
return "object";
}
static void stub_release(struct dma_fence *fence)
{
struct stub_fence *stub = container_of(fence, typeof(*stub), dma);
i915_sw_fence_fini(&stub->chain);
BUILD_BUG_ON(offsetof(typeof(*stub), dma));
dma_fence_free(&stub->dma);
}
static const struct dma_fence_ops stub_fence_ops = {
.get_driver_name = stub_driver_name,
.get_timeline_name = stub_timeline_name,
.release = stub_release,
};
struct dma_fence *
i915_gem_object_lock_fence(struct drm_i915_gem_object *obj)
{
struct stub_fence *stub;
assert_object_held(obj);
stub = kmalloc(sizeof(*stub), GFP_KERNEL);
if (!stub)
return NULL;
i915_sw_fence_init(&stub->chain, stub_notify);
dma_fence_init(&stub->dma, &stub_fence_ops, &stub->chain.wait.lock,
0, 0);
if (i915_sw_fence_await_reservation(&stub->chain,
obj->base.resv, NULL, true,
i915_fence_timeout(to_i915(obj->base.dev)),
I915_FENCE_GFP) < 0)
goto err;
dma_resv_add_excl_fence(obj->base.resv, &stub->dma);
return &stub->dma;
err:
stub_release(&stub->dma);
return NULL;
}
void i915_gem_object_unlock_fence(struct drm_i915_gem_object *obj,
struct dma_fence *fence)
{
struct stub_fence *stub = container_of(fence, typeof(*stub), dma);
i915_sw_fence_commit(&stub->chain);
}
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