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linux/drivers/dma-buf/st-dma-fence-unwrap.c

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// SPDX-License-Identifier: MIT
/*
* Copyright (C) 2022 Advanced Micro Devices, Inc.
*/
#include <linux/dma-fence-unwrap.h>
#if 0
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/mm.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/random.h>
#endif
#include "selftest.h"
#define CHAIN_SZ (4 << 10)
static inline struct mock_fence {
struct dma_fence base;
spinlock_t lock;
} *to_mock_fence(struct dma_fence *f) {
return container_of(f, struct mock_fence, base);
}
static const char *mock_name(struct dma_fence *f)
{
return "mock";
}
static const struct dma_fence_ops mock_ops = {
.get_driver_name = mock_name,
.get_timeline_name = mock_name,
};
static struct dma_fence *mock_fence(void)
{
struct mock_fence *f;
f = kmalloc(sizeof(*f), GFP_KERNEL);
if (!f)
return NULL;
spin_lock_init(&f->lock);
dma_fence_init(&f->base, &mock_ops, &f->lock, 0, 0);
return &f->base;
}
static struct dma_fence *mock_array(unsigned int num_fences, ...)
{
struct dma_fence_array *array;
struct dma_fence **fences;
va_list valist;
int i;
fences = kcalloc(num_fences, sizeof(*fences), GFP_KERNEL);
if (!fences)
return NULL;
va_start(valist, num_fences);
for (i = 0; i < num_fences; ++i)
fences[i] = va_arg(valist, typeof(*fences));
va_end(valist);
array = dma_fence_array_create(num_fences, fences,
dma_fence_context_alloc(1),
1, false);
if (!array)
goto cleanup;
return &array->base;
cleanup:
for (i = 0; i < num_fences; ++i)
dma_fence_put(fences[i]);
kfree(fences);
return NULL;
}
static struct dma_fence *mock_chain(struct dma_fence *prev,
struct dma_fence *fence)
{
struct dma_fence_chain *f;
f = dma_fence_chain_alloc();
if (!f) {
dma_fence_put(prev);
dma_fence_put(fence);
return NULL;
}
dma_fence_chain_init(f, prev, fence, 1);
return &f->base;
}
static int sanitycheck(void *arg)
{
struct dma_fence *f, *chain, *array;
int err = 0;
f = mock_fence();
if (!f)
return -ENOMEM;
array = mock_array(1, f);
if (!array)
return -ENOMEM;
chain = mock_chain(NULL, array);
if (!chain)
return -ENOMEM;
dma_fence_signal(f);
dma_fence_put(chain);
return err;
}
static int unwrap_array(void *arg)
{
struct dma_fence *fence, *f1, *f2, *array;
struct dma_fence_unwrap iter;
int err = 0;
f1 = mock_fence();
if (!f1)
return -ENOMEM;
f2 = mock_fence();
if (!f2) {
dma_fence_put(f1);
return -ENOMEM;
}
array = mock_array(2, f1, f2);
if (!array)
return -ENOMEM;
dma_fence_unwrap_for_each(fence, &iter, array) {
if (fence == f1) {
f1 = NULL;
} else if (fence == f2) {
f2 = NULL;
} else {
pr_err("Unexpected fence!\n");
err = -EINVAL;
}
}
if (f1 || f2) {
pr_err("Not all fences seen!\n");
err = -EINVAL;
}
dma_fence_signal(f1);
dma_fence_signal(f2);
dma_fence_put(array);
return 0;
}
static int unwrap_chain(void *arg)
{
struct dma_fence *fence, *f1, *f2, *chain;
struct dma_fence_unwrap iter;
int err = 0;
f1 = mock_fence();
if (!f1)
return -ENOMEM;
f2 = mock_fence();
if (!f2) {
dma_fence_put(f1);
return -ENOMEM;
}
chain = mock_chain(f1, f2);
if (!chain)
return -ENOMEM;
dma_fence_unwrap_for_each(fence, &iter, chain) {
if (fence == f1) {
f1 = NULL;
} else if (fence == f2) {
f2 = NULL;
} else {
pr_err("Unexpected fence!\n");
err = -EINVAL;
}
}
if (f1 || f2) {
pr_err("Not all fences seen!\n");
err = -EINVAL;
}
dma_fence_signal(f1);
dma_fence_signal(f2);
dma_fence_put(chain);
return 0;
}
static int unwrap_chain_array(void *arg)
{
struct dma_fence *fence, *f1, *f2, *array, *chain;
struct dma_fence_unwrap iter;
int err = 0;
f1 = mock_fence();
if (!f1)
return -ENOMEM;
f2 = mock_fence();
if (!f2) {
dma_fence_put(f1);
return -ENOMEM;
}
array = mock_array(2, f1, f2);
if (!array)
return -ENOMEM;
chain = mock_chain(NULL, array);
if (!chain)
return -ENOMEM;
dma_fence_unwrap_for_each(fence, &iter, chain) {
if (fence == f1) {
f1 = NULL;
} else if (fence == f2) {
f2 = NULL;
} else {
pr_err("Unexpected fence!\n");
err = -EINVAL;
}
}
if (f1 || f2) {
pr_err("Not all fences seen!\n");
err = -EINVAL;
}
dma_fence_signal(f1);
dma_fence_signal(f2);
dma_fence_put(chain);
return 0;
}
int dma_fence_unwrap(void)
{
static const struct subtest tests[] = {
SUBTEST(sanitycheck),
SUBTEST(unwrap_array),
SUBTEST(unwrap_chain),
SUBTEST(unwrap_chain_array),
};
return subtests(tests, NULL);
}