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OpenCloudOS-Kernel/tools/testing/radix-tree/idr-test.c

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/*
* idr-test.c: Test the IDR API
* Copyright (c) 2016 Matthew Wilcox <willy@infradead.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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/bitmap.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include "test.h"
#define DUMMY_PTR ((void *)0x12)
int item_idr_free(int id, void *p, void *data)
{
struct item *item = p;
assert(item->index == id);
free(p);
return 0;
}
void item_idr_remove(struct idr *idr, int id)
{
struct item *item = idr_find(idr, id);
assert(item->index == id);
idr_remove(idr, id);
free(item);
}
void idr_alloc_test(void)
{
unsigned long i;
DEFINE_IDR(idr);
assert(idr_alloc_cyclic(&idr, DUMMY_PTR, 0, 0x4000, GFP_KERNEL) == 0);
assert(idr_alloc_cyclic(&idr, DUMMY_PTR, 0x3ffd, 0x4000, GFP_KERNEL) == 0x3ffd);
idr_remove(&idr, 0x3ffd);
idr_remove(&idr, 0);
for (i = 0x3ffe; i < 0x4003; i++) {
int id;
struct item *item;
if (i < 0x4000)
item = item_create(i, 0);
else
item = item_create(i - 0x3fff, 0);
id = idr_alloc_cyclic(&idr, item, 1, 0x4000, GFP_KERNEL);
assert(id == item->index);
}
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
}
void idr_replace_test(void)
{
DEFINE_IDR(idr);
idr_alloc(&idr, (void *)-1, 10, 11, GFP_KERNEL);
idr_replace(&idr, &idr, 10);
idr_destroy(&idr);
}
/*
* Unlike the radix tree, you can put a NULL pointer -- with care -- into
* the IDR. Some interfaces, like idr_find() do not distinguish between
* "present, value is NULL" and "not present", but that's exactly what some
* users want.
*/
void idr_null_test(void)
{
int i;
DEFINE_IDR(idr);
assert(idr_is_empty(&idr));
assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 0);
assert(!idr_is_empty(&idr));
idr_remove(&idr, 0);
assert(idr_is_empty(&idr));
assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 0);
assert(!idr_is_empty(&idr));
idr_destroy(&idr);
assert(idr_is_empty(&idr));
for (i = 0; i < 10; i++) {
assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == i);
}
assert(idr_replace(&idr, DUMMY_PTR, 3) == NULL);
assert(idr_replace(&idr, DUMMY_PTR, 4) == NULL);
assert(idr_replace(&idr, NULL, 4) == DUMMY_PTR);
assert(idr_replace(&idr, DUMMY_PTR, 11) == ERR_PTR(-ENOENT));
idr_remove(&idr, 5);
assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 5);
idr_remove(&idr, 5);
for (i = 0; i < 9; i++) {
idr_remove(&idr, i);
assert(!idr_is_empty(&idr));
}
idr_remove(&idr, 8);
assert(!idr_is_empty(&idr));
idr_remove(&idr, 9);
assert(idr_is_empty(&idr));
assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 0);
assert(idr_replace(&idr, DUMMY_PTR, 3) == ERR_PTR(-ENOENT));
assert(idr_replace(&idr, DUMMY_PTR, 0) == NULL);
assert(idr_replace(&idr, NULL, 0) == DUMMY_PTR);
idr_destroy(&idr);
assert(idr_is_empty(&idr));
for (i = 1; i < 10; i++) {
assert(idr_alloc(&idr, NULL, 1, 0, GFP_KERNEL) == i);
}
idr_destroy(&idr);
assert(idr_is_empty(&idr));
}
void idr_nowait_test(void)
{
unsigned int i;
DEFINE_IDR(idr);
idr_preload(GFP_KERNEL);
for (i = 0; i < 3; i++) {
struct item *item = item_create(i, 0);
assert(idr_alloc(&idr, item, i, i + 1, GFP_NOWAIT) == i);
}
idr_preload_end();
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
}
void idr_get_next_test(int base)
{
unsigned long i;
int nextid;
DEFINE_IDR(idr);
idr_init_base(&idr, base);
int indices[] = {4, 7, 9, 15, 65, 128, 1000, 99999, 0};
for(i = 0; indices[i]; i++) {
struct item *item = item_create(indices[i], 0);
assert(idr_alloc(&idr, item, indices[i], indices[i+1],
GFP_KERNEL) == indices[i]);
}
for(i = 0, nextid = 0; indices[i]; i++) {
idr_get_next(&idr, &nextid);
assert(nextid == indices[i]);
nextid++;
}
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
}
void idr_checks(void)
{
unsigned long i;
DEFINE_IDR(idr);
for (i = 0; i < 10000; i++) {
struct item *item = item_create(i, 0);
assert(idr_alloc(&idr, item, 0, 20000, GFP_KERNEL) == i);
}
assert(idr_alloc(&idr, DUMMY_PTR, 5, 30, GFP_KERNEL) < 0);
for (i = 0; i < 5000; i++)
item_idr_remove(&idr, i);
idr_remove(&idr, 3);
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
assert(idr_is_empty(&idr));
idr_remove(&idr, 3);
idr_remove(&idr, 0);
for (i = INT_MAX - 3UL; i < INT_MAX + 1UL; i++) {
struct item *item = item_create(i, 0);
assert(idr_alloc(&idr, item, i, i + 10, GFP_KERNEL) == i);
}
assert(idr_alloc(&idr, DUMMY_PTR, i - 2, i, GFP_KERNEL) == -ENOSPC);
assert(idr_alloc(&idr, DUMMY_PTR, i - 2, i + 10, GFP_KERNEL) == -ENOSPC);
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
idr_destroy(&idr);
assert(idr_is_empty(&idr));
idr_set_cursor(&idr, INT_MAX - 3UL);
for (i = INT_MAX - 3UL; i < INT_MAX + 3UL; i++) {
struct item *item;
unsigned int id;
if (i <= INT_MAX)
item = item_create(i, 0);
else
item = item_create(i - INT_MAX - 1, 0);
id = idr_alloc_cyclic(&idr, item, 0, 0, GFP_KERNEL);
assert(id == item->index);
}
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
assert(idr_is_empty(&idr));
for (i = 1; i < 10000; i++) {
struct item *item = item_create(i, 0);
assert(idr_alloc(&idr, item, 1, 20000, GFP_KERNEL) == i);
}
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
idr_replace_test();
idr_alloc_test();
idr_null_test();
idr_nowait_test();
idr_get_next_test(0);
idr_get_next_test(1);
idr_get_next_test(4);
}
/*
* Check that we get the correct error when we run out of memory doing
* allocations. To ensure we run out of memory, just "forget" to preload.
* The first test is for not having a bitmap available, and the second test
* is for not being able to allocate a level of the radix tree.
*/
void ida_check_nomem(void)
{
DEFINE_IDA(ida);
int id, err;
err = ida_get_new_above(&ida, 256, &id);
assert(err == -EAGAIN);
err = ida_get_new_above(&ida, 1UL << 30, &id);
assert(err == -EAGAIN);
}
/*
* Check what happens when we fill a leaf and then delete it. This may
* discover mishandling of IDR_FREE.
*/
void ida_check_leaf(void)
{
DEFINE_IDA(ida);
int id;
unsigned long i;
for (i = 0; i < IDA_BITMAP_BITS; i++) {
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new(&ida, &id));
assert(id == i);
}
ida_destroy(&ida);
assert(ida_is_empty(&ida));
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new(&ida, &id));
assert(id == 0);
ida_destroy(&ida);
assert(ida_is_empty(&ida));
}
/*
* Check handling of conversions between exceptional entries and full bitmaps.
*/
void ida_check_conv(void)
{
DEFINE_IDA(ida);
int id;
unsigned long i;
for (i = 0; i < IDA_BITMAP_BITS * 2; i += IDA_BITMAP_BITS) {
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new_above(&ida, i + 1, &id));
assert(id == i + 1);
assert(!ida_get_new_above(&ida, i + BITS_PER_LONG, &id));
assert(id == i + BITS_PER_LONG);
ida_remove(&ida, i + 1);
ida_remove(&ida, i + BITS_PER_LONG);
assert(ida_is_empty(&ida));
}
assert(ida_pre_get(&ida, GFP_KERNEL));
for (i = 0; i < IDA_BITMAP_BITS * 2; i++) {
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new(&ida, &id));
assert(id == i);
}
for (i = IDA_BITMAP_BITS * 2; i > 0; i--) {
ida_remove(&ida, i - 1);
}
assert(ida_is_empty(&ida));
for (i = 0; i < IDA_BITMAP_BITS + BITS_PER_LONG - 4; i++) {
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new(&ida, &id));
assert(id == i);
}
for (i = IDA_BITMAP_BITS + BITS_PER_LONG - 4; i > 0; i--) {
ida_remove(&ida, i - 1);
}
assert(ida_is_empty(&ida));
radix_tree_cpu_dead(1);
for (i = 0; i < 1000000; i++) {
int err = ida_get_new(&ida, &id);
if (err == -EAGAIN) {
assert((i % IDA_BITMAP_BITS) == (BITS_PER_LONG - 2));
assert(ida_pre_get(&ida, GFP_KERNEL));
err = ida_get_new(&ida, &id);
} else {
assert((i % IDA_BITMAP_BITS) != (BITS_PER_LONG - 2));
}
assert(!err);
assert(id == i);
}
ida_destroy(&ida);
}
/*
* Check allocations up to and slightly above the maximum allowed (2^31-1) ID.
* Allocating up to 2^31-1 should succeed, and then allocating the next one
* should fail.
*/
void ida_check_max(void)
{
DEFINE_IDA(ida);
int id, err;
unsigned long i, j;
for (j = 1; j < 65537; j *= 2) {
unsigned long base = (1UL << 31) - j;
for (i = 0; i < j; i++) {
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new_above(&ida, base, &id));
assert(id == base + i);
}
assert(ida_pre_get(&ida, GFP_KERNEL));
err = ida_get_new_above(&ida, base, &id);
assert(err == -ENOSPC);
ida_destroy(&ida);
assert(ida_is_empty(&ida));
rcu_barrier();
}
}
void ida_check_random(void)
{
DEFINE_IDA(ida);
DECLARE_BITMAP(bitmap, 2048);
int id, err;
unsigned int i;
time_t s = time(NULL);
repeat:
memset(bitmap, 0, sizeof(bitmap));
for (i = 0; i < 100000; i++) {
int i = rand();
int bit = i & 2047;
if (test_bit(bit, bitmap)) {
__clear_bit(bit, bitmap);
ida_remove(&ida, bit);
} else {
__set_bit(bit, bitmap);
do {
ida_pre_get(&ida, GFP_KERNEL);
err = ida_get_new_above(&ida, bit, &id);
} while (err == -EAGAIN);
assert(!err);
assert(id == bit);
}
}
ida_destroy(&ida);
if (time(NULL) < s + 10)
goto repeat;
}
void ida_simple_get_remove_test(void)
{
DEFINE_IDA(ida);
unsigned long i;
for (i = 0; i < 10000; i++) {
assert(ida_simple_get(&ida, 0, 20000, GFP_KERNEL) == i);
}
assert(ida_simple_get(&ida, 5, 30, GFP_KERNEL) < 0);
for (i = 0; i < 10000; i++) {
ida_simple_remove(&ida, i);
}
assert(ida_is_empty(&ida));
ida_destroy(&ida);
}
void ida_checks(void)
{
DEFINE_IDA(ida);
int id;
unsigned long i;
radix_tree_cpu_dead(1);
ida_check_nomem();
for (i = 0; i < 10000; i++) {
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new(&ida, &id));
assert(id == i);
}
ida_remove(&ida, 20);
ida_remove(&ida, 21);
for (i = 0; i < 3; i++) {
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new(&ida, &id));
if (i == 2)
assert(id == 10000);
}
for (i = 0; i < 5000; i++)
ida_remove(&ida, i);
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new_above(&ida, 5000, &id));
assert(id == 10001);
ida_destroy(&ida);
assert(ida_is_empty(&ida));
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new_above(&ida, 1, &id));
assert(id == 1);
ida_remove(&ida, id);
assert(ida_is_empty(&ida));
ida_destroy(&ida);
assert(ida_is_empty(&ida));
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new_above(&ida, 1, &id));
ida_destroy(&ida);
assert(ida_is_empty(&ida));
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new_above(&ida, 1, &id));
assert(id == 1);
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new_above(&ida, 1025, &id));
assert(id == 1025);
assert(ida_pre_get(&ida, GFP_KERNEL));
assert(!ida_get_new_above(&ida, 10000, &id));
assert(id == 10000);
ida_remove(&ida, 1025);
ida_destroy(&ida);
assert(ida_is_empty(&ida));
ida_check_leaf();
ida_check_max();
ida_check_conv();
ida_check_random();
ida_simple_get_remove_test();
radix_tree_cpu_dead(1);
}
static void *ida_random_fn(void *arg)
{
rcu_register_thread();
ida_check_random();
rcu_unregister_thread();
return NULL;
}
void ida_thread_tests(void)
{
pthread_t threads[20];
int i;
for (i = 0; i < ARRAY_SIZE(threads); i++)
if (pthread_create(&threads[i], NULL, ida_random_fn, NULL)) {
perror("creating ida thread");
exit(1);
}
while (i--)
pthread_join(threads[i], NULL);
}
int __weak main(void)
{
radix_tree_init();
idr_checks();
ida_checks();
ida_thread_tests();
radix_tree_cpu_dead(1);
rcu_barrier();
if (nr_allocated)
printf("nr_allocated = %d\n", nr_allocated);
return 0;
}
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