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// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
/*
*
* (C) COPYRIGHT 2011-2021 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU license.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
*/
#include <linux/atomic.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <mali_kbase_fence.h>
#include <mali_kbase.h>
/* Spin lock protecting all Mali fences as fence->lock. */
static DEFINE_SPINLOCK(kbase_fence_lock);
#if (KERNEL_VERSION(4, 10, 0) > LINUX_VERSION_CODE)
struct fence *
kbase_fence_out_new(struct kbase_jd_atom *katom)
#else
struct dma_fence *
kbase_fence_out_new(struct kbase_jd_atom *katom)
#endif
{
#if (KERNEL_VERSION(4, 10, 0) > LINUX_VERSION_CODE)
struct fence *fence;
#else
struct dma_fence *fence;
#endif
WARN_ON(katom->dma_fence.fence);
fence = kzalloc(sizeof(*fence), GFP_KERNEL);
if (!fence)
return NULL;
dma_fence_init(fence,
&kbase_fence_ops,
&kbase_fence_lock,
katom->dma_fence.context,
atomic_inc_return(&katom->dma_fence.seqno));
katom->dma_fence.fence = fence;
return fence;
}
bool
kbase_fence_free_callbacks(struct kbase_jd_atom *katom)
{
struct kbase_fence_cb *cb, *tmp;
bool res = false;
lockdep_assert_held(&katom->kctx->jctx.lock);
/* Clean up and free callbacks. */
list_for_each_entry_safe(cb, tmp, &katom->dma_fence.callbacks, node) {
bool ret;
/* Cancel callbacks that hasn't been called yet. */
ret = dma_fence_remove_callback(cb->fence, &cb->fence_cb);
if (ret) {
int ret;
/* Fence had not signaled, clean up after
* canceling.
*/
ret = atomic_dec_return(&katom->dma_fence.dep_count);
if (unlikely(ret == 0))
res = true;
}
/*
* Release the reference taken in
* kbase_fence_add_callback().
*/
dma_fence_put(cb->fence);
list_del(&cb->node);
kfree(cb);
}
return res;
}
#if (KERNEL_VERSION(4, 10, 0) > LINUX_VERSION_CODE)
int
kbase_fence_add_callback(struct kbase_jd_atom *katom,
struct fence *fence,
fence_func_t callback)
#else
int
kbase_fence_add_callback(struct kbase_jd_atom *katom,
struct dma_fence *fence,
dma_fence_func_t callback)
#endif
{
int err = 0;
struct kbase_fence_cb *kbase_fence_cb;
if (!fence)
return -EINVAL;
kbase_fence_cb = kmalloc(sizeof(*kbase_fence_cb), GFP_KERNEL);
if (!kbase_fence_cb)
return -ENOMEM;
kbase_fence_cb->fence = fence;
kbase_fence_cb->katom = katom;
INIT_LIST_HEAD(&kbase_fence_cb->node);
atomic_inc(&katom->dma_fence.dep_count);
err = dma_fence_add_callback(fence, &kbase_fence_cb->fence_cb,
callback);
if (err == -ENOENT) {
/* Fence signaled, get the completion result */
err = dma_fence_get_status(fence);
/* remap success completion to err code */
if (err == 1)
err = 0;
kfree(kbase_fence_cb);
atomic_dec(&katom->dma_fence.dep_count);
} else if (err) {
kfree(kbase_fence_cb);
atomic_dec(&katom->dma_fence.dep_count);
} else {
/*
* Get reference to fence that will be kept until callback gets
* cleaned up in kbase_fence_free_callbacks().
*/
dma_fence_get(fence);
/* Add callback to katom's list of callbacks */
list_add(&kbase_fence_cb->node, &katom->dma_fence.callbacks);
}
return err;
}
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