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// SPDX-License-Identifier: GPL-2.0-only
/*
* Syncpoint dma_fence implementation
*
* Copyright (c) 2020, NVIDIA Corporation.
*/
#include <linux/dma-fence.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/sync_file.h>
#include "fence.h"
#include "intr.h"
#include "syncpt.h"
static DEFINE_SPINLOCK(lock);
struct host1x_syncpt_fence {
struct dma_fence base;
atomic_t signaling;
struct host1x_syncpt *sp;
u32 threshold;
struct host1x_waitlist *waiter;
void *waiter_ref;
struct delayed_work timeout_work;
};
static const char *host1x_syncpt_fence_get_driver_name(struct dma_fence *f)
{
return "host1x";
}
static const char *host1x_syncpt_fence_get_timeline_name(struct dma_fence *f)
{
return "syncpoint";
}
static struct host1x_syncpt_fence *to_host1x_fence(struct dma_fence *f)
{
return container_of(f, struct host1x_syncpt_fence, base);
}
static bool host1x_syncpt_fence_enable_signaling(struct dma_fence *f)
{
struct host1x_syncpt_fence *sf = to_host1x_fence(f);
int err;
if (host1x_syncpt_is_expired(sf->sp, sf->threshold))
return false;
dma_fence_get(f);
/*
* The dma_fence framework requires the fence driver to keep a
* reference to any fences for which 'enable_signaling' has been
* called (and that have not been signalled).
*
* We provide a userspace API to create arbitrary syncpoint fences,
* so we cannot normally guarantee that all fences get signalled.
* As such, setup a timeout, so that long-lasting fences will get
* reaped eventually.
*/
schedule_delayed_work(&sf->timeout_work, msecs_to_jiffies(30000));
err = host1x_intr_add_action(sf->sp->host, sf->sp, sf->threshold,
HOST1X_INTR_ACTION_SIGNAL_FENCE, f,
sf->waiter, &sf->waiter_ref);
if (err) {
cancel_delayed_work_sync(&sf->timeout_work);
dma_fence_put(f);
return false;
}
/* intr framework takes ownership of waiter */
sf->waiter = NULL;
/*
* The fence may get signalled at any time after the above call,
* so we need to initialize all state used by signalling
* before it.
*/
return true;
}
static void host1x_syncpt_fence_release(struct dma_fence *f)
{
struct host1x_syncpt_fence *sf = to_host1x_fence(f);
if (sf->waiter)
kfree(sf->waiter);
dma_fence_free(f);
}
const struct dma_fence_ops host1x_syncpt_fence_ops = {
.get_driver_name = host1x_syncpt_fence_get_driver_name,
.get_timeline_name = host1x_syncpt_fence_get_timeline_name,
.enable_signaling = host1x_syncpt_fence_enable_signaling,
.release = host1x_syncpt_fence_release,
};
void host1x_fence_signal(struct host1x_syncpt_fence *f)
{
if (atomic_xchg(&f->signaling, 1))
return;
/*
* Cancel pending timeout work - if it races, it will
* not get 'f->signaling' and return.
*/
cancel_delayed_work_sync(&f->timeout_work);
host1x_intr_put_ref(f->sp->host, f->sp->id, f->waiter_ref, false);
dma_fence_signal(&f->base);
dma_fence_put(&f->base);
}
static void do_fence_timeout(struct work_struct *work)
{
struct delayed_work *dwork = (struct delayed_work *)work;
struct host1x_syncpt_fence *f =
container_of(dwork, struct host1x_syncpt_fence, timeout_work);
if (atomic_xchg(&f->signaling, 1))
return;
/*
* Cancel pending timeout work - if it races, it will
* not get 'f->signaling' and return.
*/
host1x_intr_put_ref(f->sp->host, f->sp->id, f->waiter_ref, true);
dma_fence_set_error(&f->base, -ETIMEDOUT);
dma_fence_signal(&f->base);
dma_fence_put(&f->base);
}
struct dma_fence *host1x_fence_create(struct host1x_syncpt *sp, u32 threshold)
{
struct host1x_syncpt_fence *fence;
fence = kzalloc(sizeof(*fence), GFP_KERNEL);
if (!fence)
return ERR_PTR(-ENOMEM);
fence->waiter = kzalloc(sizeof(*fence->waiter), GFP_KERNEL);
if (!fence->waiter) {
kfree(fence);
return ERR_PTR(-ENOMEM);
}
fence->sp = sp;
fence->threshold = threshold;
dma_fence_init(&fence->base, &host1x_syncpt_fence_ops, &lock,
dma_fence_context_alloc(1), 0);
INIT_DELAYED_WORK(&fence->timeout_work, do_fence_timeout);
return &fence->base;
}
EXPORT_SYMBOL(host1x_fence_create);
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