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/*
* Copyright © 2017 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include "lib_sw_fence.h"
/* Small library of different fence types useful for writing tests */
static int
nop_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
{
return NOTIFY_DONE;
}
void __onstack_fence_init(struct i915_sw_fence *fence,
const char *name,
struct lock_class_key *key)
{
debug_fence_init_onstack(fence);
__init_waitqueue_head(&fence->wait, name, key);
atomic_set(&fence->pending, 1);
fence->error = 0;
fence->fn = nop_fence_notify;
}
void onstack_fence_fini(struct i915_sw_fence *fence)
{
if (!fence->fn)
return;
i915_sw_fence_commit(fence);
i915_sw_fence_fini(fence);
}
static void timed_fence_wake(struct timer_list *t)
{
struct timed_fence *tf = from_timer(tf, t, timer);
i915_sw_fence_commit(&tf->fence);
}
void timed_fence_init(struct timed_fence *tf, unsigned long expires)
{
onstack_fence_init(&tf->fence);
timer_setup_on_stack(&tf->timer, timed_fence_wake, 0);
if (time_after(expires, jiffies))
mod_timer(&tf->timer, expires);
else
i915_sw_fence_commit(&tf->fence);
}
void timed_fence_fini(struct timed_fence *tf)
{
if (del_timer_sync(&tf->timer))
i915_sw_fence_commit(&tf->fence);
destroy_timer_on_stack(&tf->timer);
i915_sw_fence_fini(&tf->fence);
}
struct heap_fence {
struct i915_sw_fence fence;
union {
struct kref ref;
struct rcu_head rcu;
};
};
static int
heap_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
{
struct heap_fence *h = container_of(fence, typeof(*h), fence);
switch (state) {
case FENCE_COMPLETE:
break;
case FENCE_FREE:
heap_fence_put(&h->fence);
}
return NOTIFY_DONE;
}
struct i915_sw_fence *heap_fence_create(gfp_t gfp)
{
struct heap_fence *h;
h = kmalloc(sizeof(*h), gfp);
if (!h)
return NULL;
i915_sw_fence_init(&h->fence, heap_fence_notify);
refcount_set(&h->ref.refcount, 2);
return &h->fence;
}
static void heap_fence_release(struct kref *ref)
{
struct heap_fence *h = container_of(ref, typeof(*h), ref);
i915_sw_fence_fini(&h->fence);
kfree_rcu(h, rcu);
}
void heap_fence_put(struct i915_sw_fence *fence)
{
struct heap_fence *h = container_of(fence, typeof(*h), fence);
kref_put(&h->ref, heap_fence_release);
}
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