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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2019 Intel Corporation
* Copyright © 2021 Advanced Micro Devices, Inc.
*/
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/dma-resv.h>
#include "selftest.h"
static struct spinlock fence_lock;
static const char *fence_name(struct dma_fence *f)
{
return "selftest";
}
static const struct dma_fence_ops fence_ops = {
.get_driver_name = fence_name,
.get_timeline_name = fence_name,
};
static struct dma_fence *alloc_fence(void)
{
struct dma_fence *f;
f = kmalloc(sizeof(*f), GFP_KERNEL);
if (!f)
return NULL;
dma_fence_init(f, &fence_ops, &fence_lock, 0, 0);
return f;
}
static int sanitycheck(void *arg)
{
struct dma_resv resv;
struct dma_fence *f;
int r;
f = alloc_fence();
if (!f)
return -ENOMEM;
dma_fence_signal(f);
dma_fence_put(f);
dma_resv_init(&resv);
r = dma_resv_lock(&resv, NULL);
if (r)
pr_err("Resv locking failed\n");
else
dma_resv_unlock(&resv);
dma_resv_fini(&resv);
return r;
}
static int test_signaling(void *arg)
{
enum dma_resv_usage usage = (unsigned long)arg;
struct dma_resv resv;
struct dma_fence *f;
int r;
f = alloc_fence();
if (!f)
return -ENOMEM;
dma_resv_init(&resv);
r = dma_resv_lock(&resv, NULL);
if (r) {
pr_err("Resv locking failed\n");
goto err_free;
}
r = dma_resv_reserve_fences(&resv, 1);
if (r) {
pr_err("Resv shared slot allocation failed\n");
goto err_unlock;
}
dma_resv_add_fence(&resv, f, usage);
if (dma_resv_test_signaled(&resv, usage)) {
pr_err("Resv unexpectedly signaled\n");
r = -EINVAL;
goto err_unlock;
}
dma_fence_signal(f);
if (!dma_resv_test_signaled(&resv, usage)) {
pr_err("Resv not reporting signaled\n");
r = -EINVAL;
goto err_unlock;
}
err_unlock:
dma_resv_unlock(&resv);
err_free:
dma_resv_fini(&resv);
dma_fence_put(f);
return r;
}
static int test_for_each(void *arg)
{
enum dma_resv_usage usage = (unsigned long)arg;
struct dma_resv_iter cursor;
struct dma_fence *f, *fence;
struct dma_resv resv;
int r;
f = alloc_fence();
if (!f)
return -ENOMEM;
dma_resv_init(&resv);
r = dma_resv_lock(&resv, NULL);
if (r) {
pr_err("Resv locking failed\n");
goto err_free;
}
r = dma_resv_reserve_fences(&resv, 1);
if (r) {
pr_err("Resv shared slot allocation failed\n");
goto err_unlock;
}
dma_resv_add_fence(&resv, f, usage);
r = -ENOENT;
dma_resv_for_each_fence(&cursor, &resv, usage, fence) {
if (!r) {
pr_err("More than one fence found\n");
r = -EINVAL;
goto err_unlock;
}
if (f != fence) {
pr_err("Unexpected fence\n");
r = -EINVAL;
goto err_unlock;
}
if (dma_resv_iter_usage(&cursor) != usage) {
pr_err("Unexpected fence usage\n");
r = -EINVAL;
goto err_unlock;
}
r = 0;
}
if (r) {
pr_err("No fence found\n");
goto err_unlock;
}
dma_fence_signal(f);
err_unlock:
dma_resv_unlock(&resv);
err_free:
dma_resv_fini(&resv);
dma_fence_put(f);
return r;
}
static int test_for_each_unlocked(void *arg)
{
enum dma_resv_usage usage = (unsigned long)arg;
struct dma_resv_iter cursor;
struct dma_fence *f, *fence;
struct dma_resv resv;
int r;
f = alloc_fence();
if (!f)
return -ENOMEM;
dma_resv_init(&resv);
r = dma_resv_lock(&resv, NULL);
if (r) {
pr_err("Resv locking failed\n");
goto err_free;
}
r = dma_resv_reserve_fences(&resv, 1);
if (r) {
pr_err("Resv shared slot allocation failed\n");
dma_resv_unlock(&resv);
goto err_free;
}
dma_resv_add_fence(&resv, f, usage);
dma_resv_unlock(&resv);
r = -ENOENT;
dma_resv_iter_begin(&cursor, &resv, usage);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
if (!r) {
pr_err("More than one fence found\n");
r = -EINVAL;
goto err_iter_end;
}
if (!dma_resv_iter_is_restarted(&cursor)) {
pr_err("No restart flag\n");
goto err_iter_end;
}
if (f != fence) {
pr_err("Unexpected fence\n");
r = -EINVAL;
goto err_iter_end;
}
if (dma_resv_iter_usage(&cursor) != usage) {
pr_err("Unexpected fence usage\n");
r = -EINVAL;
goto err_iter_end;
}
/* We use r as state here */
if (r == -ENOENT) {
r = -EINVAL;
/* That should trigger an restart */
cursor.fences = (void*)~0;
} else if (r == -EINVAL) {
r = 0;
}
}
if (r)
pr_err("No fence found\n");
err_iter_end:
dma_resv_iter_end(&cursor);
dma_fence_signal(f);
err_free:
dma_resv_fini(&resv);
dma_fence_put(f);
return r;
}
static int test_get_fences(void *arg)
{
enum dma_resv_usage usage = (unsigned long)arg;
struct dma_fence *f, **fences = NULL;
struct dma_resv resv;
int r, i;
f = alloc_fence();
if (!f)
return -ENOMEM;
dma_resv_init(&resv);
r = dma_resv_lock(&resv, NULL);
if (r) {
pr_err("Resv locking failed\n");
goto err_resv;
}
r = dma_resv_reserve_fences(&resv, 1);
if (r) {
pr_err("Resv shared slot allocation failed\n");
dma_resv_unlock(&resv);
goto err_resv;
}
dma_resv_add_fence(&resv, f, usage);
dma_resv_unlock(&resv);
r = dma_resv_get_fences(&resv, usage, &i, &fences);
if (r) {
pr_err("get_fences failed\n");
goto err_free;
}
if (i != 1 || fences[0] != f) {
pr_err("get_fences returned unexpected fence\n");
goto err_free;
}
dma_fence_signal(f);
err_free:
while (i--)
dma_fence_put(fences[i]);
kfree(fences);
err_resv:
dma_resv_fini(&resv);
dma_fence_put(f);
return r;
}
int dma_resv(void)
{
static const struct subtest tests[] = {
SUBTEST(sanitycheck),
SUBTEST(test_signaling),
SUBTEST(test_for_each),
SUBTEST(test_for_each_unlocked),
SUBTEST(test_get_fences),
};
enum dma_resv_usage usage;
int r;
spin_lock_init(&fence_lock);
for (usage = DMA_RESV_USAGE_KERNEL; usage <= DMA_RESV_USAGE_BOOKKEEP;
++usage) {
r = subtests(tests, (void *)(unsigned long)usage);
if (r)
return r;
}
return 0;
}
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