linux-imx

/*

 * dma-fence-array: aggregate fences to be waited together

 *

 * Copyright (C) 2016 Collabora Ltd

 * Copyright (C) 2016 Advanced Micro Devices, Inc.

 * Authors:

 *  Gustavo Padovan <gustavo@padovan.org>

 *  Christian König <christian.koenig@amd.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 *

 * 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.

 */

​

#include <linux/export.h>

#include <linux/slab.h>

#include <linux/dma-fence-array.h>

​

static const char *dma_fence_array_get_driver_name(struct dma_fence *fence)

{

    return "dma_fence_array";

}

​

static const char *dma_fence_array_get_timeline_name(struct dma_fence *fence)

{

    return "unbound";

}

​

static void irq_dma_fence_array_work(struct irq_work *wrk)

{

    struct dma_fence_array *array = container_of(wrk, typeof(*array), work);

​

    dma_fence_signal(&array->base);

    dma_fence_put(&array->base);

}

​

static void dma_fence_array_cb_func(struct dma_fence *f,

                    struct dma_fence_cb *cb)

{

    struct dma_fence_array_cb *array_cb =

        container_of(cb, struct dma_fence_array_cb, cb);

    struct dma_fence_array *array = array_cb->array;

​

    if (atomic_dec_and_test(&array->num_pending))

        irq_work_queue(&array->work);

    else

        dma_fence_put(&array->base);

}

​

static bool dma_fence_array_enable_signaling(struct dma_fence *fence)

{

    struct dma_fence_array *array = to_dma_fence_array(fence);

    struct dma_fence_array_cb *cb = (void *)(&array[1]);

    unsigned i;

​

    for (i = 0; i < array->num_fences; ++i) {

        cb[i].array = array;

        /*