146 lines
4.3 KiB
C
146 lines
4.3 KiB
C
/*
|
|
* 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/fence-array.h>
|
|
|
|
static void fence_array_cb_func(struct fence *f, struct fence_cb *cb);
|
|
|
|
static const char *fence_array_get_driver_name(struct fence *fence)
|
|
{
|
|
return "fence_array";
|
|
}
|
|
|
|
static const char *fence_array_get_timeline_name(struct fence *fence)
|
|
{
|
|
return "unbound";
|
|
}
|
|
|
|
static void fence_array_cb_func(struct fence *f, struct fence_cb *cb)
|
|
{
|
|
struct fence_array_cb *array_cb =
|
|
container_of(cb, struct fence_array_cb, cb);
|
|
struct fence_array *array = array_cb->array;
|
|
|
|
if (atomic_dec_and_test(&array->num_pending))
|
|
fence_signal(&array->base);
|
|
fence_put(&array->base);
|
|
}
|
|
|
|
static bool fence_array_enable_signaling(struct fence *fence)
|
|
{
|
|
struct fence_array *array = to_fence_array(fence);
|
|
struct fence_array_cb *cb = (void *)(&array[1]);
|
|
unsigned i;
|
|
|
|
for (i = 0; i < array->num_fences; ++i) {
|
|
cb[i].array = array;
|
|
/*
|
|
* As we may report that the fence is signaled before all
|
|
* callbacks are complete, we need to take an additional
|
|
* reference count on the array so that we do not free it too
|
|
* early. The core fence handling will only hold the reference
|
|
* until we signal the array as complete (but that is now
|
|
* insufficient).
|
|
*/
|
|
fence_get(&array->base);
|
|
if (fence_add_callback(array->fences[i], &cb[i].cb,
|
|
fence_array_cb_func)) {
|
|
fence_put(&array->base);
|
|
if (atomic_dec_and_test(&array->num_pending))
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool fence_array_signaled(struct fence *fence)
|
|
{
|
|
struct fence_array *array = to_fence_array(fence);
|
|
|
|
return atomic_read(&array->num_pending) <= 0;
|
|
}
|
|
|
|
static void fence_array_release(struct fence *fence)
|
|
{
|
|
struct fence_array *array = to_fence_array(fence);
|
|
unsigned i;
|
|
|
|
for (i = 0; i < array->num_fences; ++i)
|
|
fence_put(array->fences[i]);
|
|
|
|
kfree(array->fences);
|
|
fence_free(fence);
|
|
}
|
|
|
|
const struct fence_ops fence_array_ops = {
|
|
.get_driver_name = fence_array_get_driver_name,
|
|
.get_timeline_name = fence_array_get_timeline_name,
|
|
.enable_signaling = fence_array_enable_signaling,
|
|
.signaled = fence_array_signaled,
|
|
.wait = fence_default_wait,
|
|
.release = fence_array_release,
|
|
};
|
|
EXPORT_SYMBOL(fence_array_ops);
|
|
|
|
/**
|
|
* fence_array_create - Create a custom fence array
|
|
* @num_fences: [in] number of fences to add in the array
|
|
* @fences: [in] array containing the fences
|
|
* @context: [in] fence context to use
|
|
* @seqno: [in] sequence number to use
|
|
* @signal_on_any: [in] signal on any fence in the array
|
|
*
|
|
* Allocate a fence_array object and initialize the base fence with fence_init().
|
|
* In case of error it returns NULL.
|
|
*
|
|
* The caller should allocate the fences array with num_fences size
|
|
* and fill it with the fences it wants to add to the object. Ownership of this
|
|
* array is taken and fence_put() is used on each fence on release.
|
|
*
|
|
* If @signal_on_any is true the fence array signals if any fence in the array
|
|
* signals, otherwise it signals when all fences in the array signal.
|
|
*/
|
|
struct fence_array *fence_array_create(int num_fences, struct fence **fences,
|
|
u64 context, unsigned seqno,
|
|
bool signal_on_any)
|
|
{
|
|
struct fence_array *array;
|
|
size_t size = sizeof(*array);
|
|
|
|
/* Allocate the callback structures behind the array. */
|
|
size += num_fences * sizeof(struct fence_array_cb);
|
|
array = kzalloc(size, GFP_KERNEL);
|
|
if (!array)
|
|
return NULL;
|
|
|
|
spin_lock_init(&array->lock);
|
|
fence_init(&array->base, &fence_array_ops, &array->lock,
|
|
context, seqno);
|
|
|
|
array->num_fences = num_fences;
|
|
atomic_set(&array->num_pending, signal_on_any ? 1 : num_fences);
|
|
array->fences = fences;
|
|
|
|
return array;
|
|
}
|
|
EXPORT_SYMBOL(fence_array_create);
|