linux/drivers/dma-buf/dma-fence-array.c
Thomas Gleixner 1802d0beec treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 655 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:41 -07:00

174 lines
5.0 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* 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>
*/
#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;
/*
* 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).
*/
dma_fence_get(&array->base);
if (dma_fence_add_callback(array->fences[i], &cb[i].cb,
dma_fence_array_cb_func)) {
dma_fence_put(&array->base);
if (atomic_dec_and_test(&array->num_pending))
return false;
}
}
return true;
}
static bool dma_fence_array_signaled(struct dma_fence *fence)
{
struct dma_fence_array *array = to_dma_fence_array(fence);
return atomic_read(&array->num_pending) <= 0;
}
static void dma_fence_array_release(struct dma_fence *fence)
{
struct dma_fence_array *array = to_dma_fence_array(fence);
unsigned i;
for (i = 0; i < array->num_fences; ++i)
dma_fence_put(array->fences[i]);
kfree(array->fences);
dma_fence_free(fence);
}
const struct dma_fence_ops dma_fence_array_ops = {
.get_driver_name = dma_fence_array_get_driver_name,
.get_timeline_name = dma_fence_array_get_timeline_name,
.enable_signaling = dma_fence_array_enable_signaling,
.signaled = dma_fence_array_signaled,
.release = dma_fence_array_release,
};
EXPORT_SYMBOL(dma_fence_array_ops);
/**
* dma_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 dma_fence_array object and initialize the base fence with
* dma_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 dma_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 dma_fence_array *dma_fence_array_create(int num_fences,
struct dma_fence **fences,
u64 context, unsigned seqno,
bool signal_on_any)
{
struct dma_fence_array *array;
size_t size = sizeof(*array);
/* Allocate the callback structures behind the array. */
size += num_fences * sizeof(struct dma_fence_array_cb);
array = kzalloc(size, GFP_KERNEL);
if (!array)
return NULL;
spin_lock_init(&array->lock);
dma_fence_init(&array->base, &dma_fence_array_ops, &array->lock,
context, seqno);
init_irq_work(&array->work, irq_dma_fence_array_work);
array->num_fences = num_fences;
atomic_set(&array->num_pending, signal_on_any ? 1 : num_fences);
array->fences = fences;
return array;
}
EXPORT_SYMBOL(dma_fence_array_create);
/**
* dma_fence_match_context - Check if all fences are from the given context
* @fence: [in] fence or fence array
* @context: [in] fence context to check all fences against
*
* Checks the provided fence or, for a fence array, all fences in the array
* against the given context. Returns false if any fence is from a different
* context.
*/
bool dma_fence_match_context(struct dma_fence *fence, u64 context)
{
struct dma_fence_array *array = to_dma_fence_array(fence);
unsigned i;
if (!dma_fence_is_array(fence))
return fence->context == context;
for (i = 0; i < array->num_fences; i++) {
if (array->fences[i]->context != context)
return false;
}
return true;
}
EXPORT_SYMBOL(dma_fence_match_context);