// SPDX-License-Identifier: GPL-2.0-only
/*
* idr-test.c: Test the IDR API
* Copyright (c) 2016 Matthew Wilcox <willy@infradead.org>
*/
#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 *)0 x10)
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 , 0 x4000, GFP_KERNEL) == 0 );
assert(idr_alloc_cyclic(&idr, DUMMY_PTR, 0 x3ffd, 0 x4000, GFP_KERNEL) == 0 x3ffd);
idr_remove(&idr, 0 x3ffd);
idr_remove(&idr, 0 );
for (i = 0 x3ffe; i < 0 x4003; i++) {
int id;
struct item *item;
if (i < 0 x4000)
item = item_create(i, 0 );
else
item = item_create(i - 0 x3fff, 0 );
id = idr_alloc_cyclic(&idr, item, 1 , 0 x4000, 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);
}
int idr_u32_cb(int id, void *ptr, void *data)
{
BUG_ON(id < 0 );
BUG_ON(ptr != DUMMY_PTR);
return 0 ;
}
void idr_u32_test1(struct idr *idr, u32 handle)
{
static bool warned = false ;
u32 id = handle;
int sid = 0 ;
void *ptr;
BUG_ON(idr_alloc_u32(idr, DUMMY_PTR, &id, id, GFP_KERNEL));
BUG_ON(id != handle);
BUG_ON(idr_alloc_u32(idr, DUMMY_PTR, &id, id, GFP_KERNEL) != -ENOSPC);
BUG_ON(id != handle);
if (!warned && id > INT_MAX)
printk("vvv Ignore these warnings\n" );
ptr = idr_get_next(idr, &sid);
if (id > INT_MAX) {
BUG_ON(ptr != NULL);
BUG_ON(sid != 0 );
} else {
BUG_ON(ptr != DUMMY_PTR);
BUG_ON(sid != id);
}
idr_for_each(idr, idr_u32_cb, NULL);
if (!warned && id > INT_MAX) {
printk("^^^ Warnings over\n" );
warned = true ;
}
BUG_ON(idr_remove(idr, id) != DUMMY_PTR);
BUG_ON(!idr_is_empty(idr));
}
void idr_u32_test(int base)
{
DEFINE_IDR(idr);
idr_init_base(&idr, base);
idr_u32_test1(&idr, 10 );
idr_u32_test1(&idr, 0 x7fffffff);
idr_u32_test1(&idr, 0 x80000000);
idr_u32_test1(&idr, 0 x80000001);
idr_u32_test1(&idr, 0 xffe00000);
idr_u32_test1(&idr, 0 xffffffff);
}
static void idr_align_test(struct idr *idr)
{
char name[] = "Motorola 68000" ;
int i, id;
void *entry;
for (i = 0 ; i < 9 ; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0 , 0 , GFP_KERNEL) != i);
idr_for_each_entry(idr, entry, id);
}
idr_destroy(idr);
for (i = 1 ; i < 10 ; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0 , 0 , GFP_KERNEL) != i - 1 );
idr_for_each_entry(idr, entry, id);
}
idr_destroy(idr);
for (i = 2 ; i < 11 ; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0 , 0 , GFP_KERNEL) != i - 2 );
idr_for_each_entry(idr, entry, id);
}
idr_destroy(idr);
for (i = 3 ; i < 12 ; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0 , 0 , GFP_KERNEL) != i - 3 );
idr_for_each_entry(idr, entry, id);
}
idr_destroy(idr);
for (i = 0 ; i < 8 ; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0 , 0 , GFP_KERNEL) != 0 );
BUG_ON(idr_alloc(idr, &name[i + 1 ], 0 , 0 , GFP_KERNEL) != 1 );
idr_for_each_entry(idr, entry, id);
idr_remove(idr, 1 );
idr_for_each_entry(idr, entry, id);
idr_remove(idr, 0 );
BUG_ON(!idr_is_empty(idr));
}
for (i = 0 ; i < 8 ; i++) {
BUG_ON(idr_alloc(idr, NULL, 0 , 0 , GFP_KERNEL) != 0 );
idr_for_each_entry(idr, entry, id);
idr_replace(idr, &name[i], 0 );
idr_for_each_entry(idr, entry, id);
BUG_ON(idr_find(idr, 0 ) != &name[i]);
idr_remove(idr, 0 );
}
for (i = 0 ; i < 8 ; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0 , 0 , GFP_KERNEL) != 0 );
BUG_ON(idr_alloc(idr, NULL, 0 , 0 , GFP_KERNEL) != 1 );
idr_remove(idr, 1 );
idr_for_each_entry(idr, entry, id);
idr_replace(idr, &name[i + 1 ], 0 );
idr_for_each_entry(idr, entry, id);
idr_remove(idr, 0 );
}
}
DEFINE_IDR(find_idr);
static void *idr_throbber(void *arg)
{
time_t start = time(NULL);
int id = *(int *)arg;
rcu_register_thread();
do {
idr_alloc(&find_idr, xa_mk_value(id), id, id + 1 , GFP_KERNEL);
idr_remove(&find_idr, id);
} while (time(NULL) < start + 10 );
rcu_unregister_thread();
return NULL;
}
/*
* There are always either 1 or 2 objects in the IDR. If we find nothing,
* or we find something at an ID we didn't expect, that's a bug.
*/
void idr_find_test_1(int anchor_id, int throbber_id)
{
pthread_t throbber;
time_t start = time(NULL);
BUG_ON(idr_alloc(&find_idr, xa_mk_value(anchor_id), anchor_id,
anchor_id + 1 , GFP_KERNEL) != anchor_id);
pthread_create(&throbber, NULL, idr_throbber, &throbber_id);
rcu_read_lock();
do {
int id = 0 ;
void *entry = idr_get_next(&find_idr, &id);
rcu_read_unlock();
if ((id != anchor_id && id != throbber_id) ||
entry != xa_mk_value(id)) {
printf("%s(%d, %d): %p at %d\n" , __func__, anchor_id,
throbber_id, entry, id);
abort();
}
rcu_read_lock();
} while (time(NULL) < start + 11 );
rcu_read_unlock();
pthread_join(throbber, NULL);
idr_remove(&find_idr, anchor_id);
BUG_ON(!idr_is_empty(&find_idr));
}
void idr_find_test(void )
{
idr_find_test_1(100000 , 0 );
idr_find_test_1(0 , 100000 );
}
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 );
assert(idr_alloc(&idr, DUMMY_PTR, 0 , 0 , GFP_KERNEL) == 0 );
idr_remove(&idr, 1 );
for (i = 1 ; i < RADIX_TREE_MAP_SIZE; i++)
assert(idr_alloc(&idr, DUMMY_PTR, 0 , 0 , GFP_KERNEL) == i);
idr_remove(&idr, 1 << 30 );
idr_destroy(&idr);
for (i = INT_MAX - 3 UL; i < INT_MAX + 1 UL; 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 - 3 UL);
for (i = INT_MAX - 3 UL; i < INT_MAX + 3 UL; 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 );
idr_u32_test(4 );
idr_u32_test(1 );
idr_u32_test(0 );
idr_align_test(&idr);
idr_find_test();
}
#define module_init(x)
#define module_exit(x)
#define MODULE_AUTHOR(x)
#define MODULE_DESCRIPTION(X)
#define MODULE_LICENSE(x)
#define dump_stack() assert(0 )
void ida_dump(struct ida *);
#include "../../../lib/test_ida.c"
/*
* Check that we get the correct error when we run out of memory doing
* allocations. In userspace, GFP_NOWAIT will always fail an allocation.
* 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;
id = ida_alloc_min(&ida, 256 , GFP_NOWAIT);
IDA_BUG_ON(&ida, id != -ENOMEM);
id = ida_alloc_min(&ida, 1 UL << 30 , GFP_NOWAIT);
IDA_BUG_ON(&ida, id != -ENOMEM);
IDA_BUG_ON(&ida, !ida_is_empty(&ida));
}
/*
* Check handling of conversions between exceptional entries and full bitmaps.
*/
void ida_check_conv_user(void )
{
DEFINE_IDA(ida);
unsigned long i;
for (i = 0 ; i < 1000000 ; i++) {
int id = ida_alloc(&ida, GFP_NOWAIT);
if (id == -ENOMEM) {
IDA_BUG_ON(&ida, ((i % IDA_BITMAP_BITS) !=
BITS_PER_XA_VALUE) &&
((i % IDA_BITMAP_BITS) != 0 ));
id = ida_alloc(&ida, GFP_KERNEL);
} else {
IDA_BUG_ON(&ida, (i % IDA_BITMAP_BITS) ==
BITS_PER_XA_VALUE);
}
IDA_BUG_ON(&ida, id != i);
}
ida_destroy(&ida);
}
void ida_check_random(void )
{
DEFINE_IDA(ida);
DECLARE_BITMAP(bitmap, 2048 );
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_free(&ida, bit);
} else {
__set_bit(bit, bitmap);
IDA_BUG_ON(&ida, ida_alloc_min(&ida, bit, GFP_KERNEL)
!= 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 user_ida_checks(void )
{
radix_tree_cpu_dead(1 );
ida_check_nomem();
ida_check_conv_user();
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;
}
static void *ida_leak_fn(void *arg)
{
struct ida *ida = arg;
time_t s = time(NULL);
int i, ret;
rcu_register_thread();
do for (i = 0 ; i < 1000 ; i++) {
ret = ida_alloc_range(ida, 128 , 128 , GFP_KERNEL);
if (ret >= 0 )
ida_free(ida, 128 );
} while (time(NULL) < s + 2 );
rcu_unregister_thread();
return NULL;
}
void ida_thread_tests(void )
{
DEFINE_IDA(ida);
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);
for (i = 0 ; i < ARRAY_SIZE(threads); i++)
if (pthread_create(&threads[i], NULL, ida_leak_fn, &ida)) {
perror("creating ida thread" );
exit (1 );
}
while (i--)
pthread_join(threads[i], NULL);
assert(ida_is_empty(&ida));
}
void ida_tests(void )
{
user_ida_checks();
ida_checks();
ida_exit();
ida_thread_tests();
}
int __weak main(void )
{
rcu_register_thread();
radix_tree_init();
idr_checks();
ida_tests();
radix_tree_cpu_dead(1 );
rcu_barrier();
if (nr_allocated)
printf("nr_allocated = %d\n" , nr_allocated);
rcu_unregister_thread();
return 0 ;
}
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