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test_xarray.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* test_xarray.c: Test the XArray API
* Copyright (c) 2017-2018 Microsoft Corporation
* Copyright (c) 2019-2020 Oracle
* Author: Matthew Wilcox <[email protected]>
*/
#include <linux/xarray.h>
#include <linux/module.h>
static unsigned int tests_run;
static unsigned int tests_passed;
static const unsigned int order_limit =
IS_ENABLED(CONFIG_XARRAY_MULTI) ? BITS_PER_LONG : 1;
#ifndef XA_DEBUG
# ifdef __KERNEL__
void xa_dump(const struct xarray *xa) { }
# endif
#undef XA_BUG_ON
#define XA_BUG_ON(xa, x) do { \
tests_run++; \
if (x) { \
printk("BUG at %s:%d\n", __func__, __LINE__); \
xa_dump(xa); \
dump_stack(); \
} else { \
tests_passed++; \
} \
} while (0)
#endif
static void *xa_mk_index(unsigned long index)
{
return xa_mk_value(index & LONG_MAX);
}
static void *xa_store_index(struct xarray *xa, unsigned long index, gfp_t gfp)
{
return xa_store(xa, index, xa_mk_index(index), gfp);
}
static void xa_insert_index(struct xarray *xa, unsigned long index)
{
XA_BUG_ON(xa, xa_insert(xa, index, xa_mk_index(index),
GFP_KERNEL) != 0);
}
static void xa_alloc_index(struct xarray *xa, unsigned long index, gfp_t gfp)
{
u32 id;
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(index), xa_limit_32b,
gfp) != 0);
XA_BUG_ON(xa, id != index);
}
static void xa_erase_index(struct xarray *xa, unsigned long index)
{
XA_BUG_ON(xa, xa_erase(xa, index) != xa_mk_index(index));
XA_BUG_ON(xa, xa_load(xa, index) != NULL);
}
/*
* If anyone needs this, please move it to xarray.c. We have no current
* users outside the test suite because all current multislot users want
* to use the advanced API.
*/
static void *xa_store_order(struct xarray *xa, unsigned long index,
unsigned order, void *entry, gfp_t gfp)
{
XA_STATE_ORDER(xas, xa, index, order);
void *curr;
do {
xas_lock(&xas);
curr = xas_store(&xas, entry);
xas_unlock(&xas);
} while (xas_nomem(&xas, gfp));
return curr;
}
static noinline void check_xa_err(struct xarray *xa)
{
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 0, GFP_NOWAIT)) != 0);
XA_BUG_ON(xa, xa_err(xa_erase(xa, 0)) != 0);
#ifndef __KERNEL__
/* The kernel does not fail GFP_NOWAIT allocations */
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
#endif
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_KERNEL)) != 0);
XA_BUG_ON(xa, xa_err(xa_store(xa, 1, xa_mk_value(0), GFP_KERNEL)) != 0);
XA_BUG_ON(xa, xa_err(xa_erase(xa, 1)) != 0);
// kills the test-suite :-(
// XA_BUG_ON(xa, xa_err(xa_store(xa, 0, xa_mk_internal(0), 0)) != -EINVAL);
}
static noinline void check_xas_retry(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
void *entry;
xa_store_index(xa, 0, GFP_KERNEL);
xa_store_index(xa, 1, GFP_KERNEL);
rcu_read_lock();
XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_value(0));
xa_erase_index(xa, 1);
XA_BUG_ON(xa, !xa_is_retry(xas_reload(&xas)));
XA_BUG_ON(xa, xas_retry(&xas, NULL));
XA_BUG_ON(xa, xas_retry(&xas, xa_mk_value(0)));
xas_reset(&xas);
XA_BUG_ON(xa, xas.xa_node != XAS_RESTART);
XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
XA_BUG_ON(xa, xas.xa_node != NULL);
rcu_read_unlock();
XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
rcu_read_lock();
XA_BUG_ON(xa, !xa_is_internal(xas_reload(&xas)));
xas.xa_node = XAS_RESTART;
XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
rcu_read_unlock();
/* Make sure we can iterate through retry entries */
xas_lock(&xas);
xas_set(&xas, 0);
xas_store(&xas, XA_RETRY_ENTRY);
xas_set(&xas, 1);
xas_store(&xas, XA_RETRY_ENTRY);
xas_set(&xas, 0);
xas_for_each(&xas, entry, ULONG_MAX) {
xas_store(&xas, xa_mk_index(xas.xa_index));
}
xas_unlock(&xas);
xa_erase_index(xa, 0);
xa_erase_index(xa, 1);
}
static noinline void check_xa_load(struct xarray *xa)
{
unsigned long i, j;
for (i = 0; i < 1024; i++) {
for (j = 0; j < 1024; j++) {
void *entry = xa_load(xa, j);
if (j < i)
XA_BUG_ON(xa, xa_to_value(entry) != j);
else
XA_BUG_ON(xa, entry);
}
XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
}
for (i = 0; i < 1024; i++) {
for (j = 0; j < 1024; j++) {
void *entry = xa_load(xa, j);
if (j >= i)
XA_BUG_ON(xa, xa_to_value(entry) != j);
else
XA_BUG_ON(xa, entry);
}
xa_erase_index(xa, i);
}
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_xa_mark_1(struct xarray *xa, unsigned long index)
{
unsigned int order;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 8 : 1;
/* NULL elements have no marks set */
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
xa_set_mark(xa, index, XA_MARK_0);
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
/* Storing a pointer will not make a mark appear */
XA_BUG_ON(xa, xa_store_index(xa, index, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
xa_set_mark(xa, index, XA_MARK_0);
XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
/* Setting one mark will not set another mark */
XA_BUG_ON(xa, xa_get_mark(xa, index + 1, XA_MARK_0));
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_1));
/* Storing NULL clears marks, and they can't be set again */
xa_erase_index(xa, index);
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
xa_set_mark(xa, index, XA_MARK_0);
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
/*
* Storing a multi-index entry over entries with marks gives the
* entire entry the union of the marks
*/
BUG_ON((index % 4) != 0);
for (order = 2; order < max_order; order++) {
unsigned long base = round_down(index, 1UL << order);
unsigned long next = base + (1UL << order);
unsigned long i;
XA_BUG_ON(xa, xa_store_index(xa, index + 1, GFP_KERNEL));
xa_set_mark(xa, index + 1, XA_MARK_0);
XA_BUG_ON(xa, xa_store_index(xa, index + 2, GFP_KERNEL));
xa_set_mark(xa, index + 2, XA_MARK_2);
XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL));
xa_store_order(xa, index, order, xa_mk_index(index),
GFP_KERNEL);
for (i = base; i < next; i++) {
XA_STATE(xas, xa, i);
unsigned int seen = 0;
void *entry;
XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_1));
XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_2));
/* We should see two elements in the array */
rcu_read_lock();
xas_for_each(&xas, entry, ULONG_MAX)
seen++;
rcu_read_unlock();
XA_BUG_ON(xa, seen != 2);
/* One of which is marked */
xas_set(&xas, 0);
seen = 0;
rcu_read_lock();
xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
seen++;
rcu_read_unlock();
XA_BUG_ON(xa, seen != 1);
}
XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_0));
XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_1));
XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_2));
xa_erase_index(xa, index);
xa_erase_index(xa, next);
XA_BUG_ON(xa, !xa_empty(xa));
}
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_xa_mark_2(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
unsigned long index;
unsigned int count = 0;
void *entry;
xa_store_index(xa, 0, GFP_KERNEL);
xa_set_mark(xa, 0, XA_MARK_0);
xas_lock(&xas);
xas_load(&xas);
xas_init_marks(&xas);
xas_unlock(&xas);
XA_BUG_ON(xa, !xa_get_mark(xa, 0, XA_MARK_0) == 0);
for (index = 3500; index < 4500; index++) {
xa_store_index(xa, index, GFP_KERNEL);
xa_set_mark(xa, index, XA_MARK_0);
}
xas_reset(&xas);
rcu_read_lock();
xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
count++;
rcu_read_unlock();
XA_BUG_ON(xa, count != 1000);
xas_lock(&xas);
xas_for_each(&xas, entry, ULONG_MAX) {
xas_init_marks(&xas);
XA_BUG_ON(xa, !xa_get_mark(xa, xas.xa_index, XA_MARK_0));
XA_BUG_ON(xa, !xas_get_mark(&xas, XA_MARK_0));
}
xas_unlock(&xas);
xa_destroy(xa);
}
static noinline void check_xa_mark(struct xarray *xa)
{
unsigned long index;
for (index = 0; index < 16384; index += 4)
check_xa_mark_1(xa, index);
check_xa_mark_2(xa);
}
static noinline void check_xa_shrink(struct xarray *xa)
{
XA_STATE(xas, xa, 1);
struct xa_node *node;
unsigned int order;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 15 : 1;
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_store_index(xa, 0, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
/*
* Check that erasing the entry at 1 shrinks the tree and properly
* marks the node as being deleted.
*/
xas_lock(&xas);
XA_BUG_ON(xa, xas_load(&xas) != xa_mk_value(1));
node = xas.xa_node;
XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != xa_mk_value(0));
XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 1) != NULL);
XA_BUG_ON(xa, xas.xa_node != XAS_BOUNDS);
XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != XA_RETRY_ENTRY);
XA_BUG_ON(xa, xas_load(&xas) != NULL);
xas_unlock(&xas);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
xa_erase_index(xa, 0);
XA_BUG_ON(xa, !xa_empty(xa));
for (order = 0; order < max_order; order++) {
unsigned long max = (1UL << order) - 1;
xa_store_order(xa, 0, order, xa_mk_value(0), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, max) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
rcu_read_lock();
node = xa_head(xa);
rcu_read_unlock();
XA_BUG_ON(xa, xa_store_index(xa, ULONG_MAX, GFP_KERNEL) !=
NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_head(xa) == node);
rcu_read_unlock();
XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
xa_erase_index(xa, ULONG_MAX);
XA_BUG_ON(xa, xa->xa_head != node);
xa_erase_index(xa, 0);
}
}
static noinline void check_insert(struct xarray *xa)
{
unsigned long i;
for (i = 0; i < 1024; i++) {
xa_insert_index(xa, i);
XA_BUG_ON(xa, xa_load(xa, i - 1) != NULL);
XA_BUG_ON(xa, xa_load(xa, i + 1) != NULL);
xa_erase_index(xa, i);
}
for (i = 10; i < BITS_PER_LONG; i++) {
xa_insert_index(xa, 1UL << i);
XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 1) != NULL);
XA_BUG_ON(xa, xa_load(xa, (1UL << i) + 1) != NULL);
xa_erase_index(xa, 1UL << i);
xa_insert_index(xa, (1UL << i) - 1);
XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 2) != NULL);
XA_BUG_ON(xa, xa_load(xa, 1UL << i) != NULL);
xa_erase_index(xa, (1UL << i) - 1);
}
xa_insert_index(xa, ~0UL);
XA_BUG_ON(xa, xa_load(xa, 0UL) != NULL);
XA_BUG_ON(xa, xa_load(xa, ~1UL) != NULL);
xa_erase_index(xa, ~0UL);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_cmpxchg(struct xarray *xa)
{
void *FIVE = xa_mk_value(5);
void *SIX = xa_mk_value(6);
void *LOTS = xa_mk_value(12345678);
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_insert(xa, 12345678, xa, GFP_KERNEL) != -EBUSY);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, SIX, FIVE, GFP_KERNEL) != LOTS);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, LOTS, FIVE, GFP_KERNEL) != LOTS);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, FIVE, LOTS, GFP_KERNEL) != FIVE);
XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_cmpxchg(xa, 5, NULL, FIVE, GFP_KERNEL) != NULL);
xa_erase_index(xa, 12345678);
xa_erase_index(xa, 5);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_reserve(struct xarray *xa)
{
void *entry;
unsigned long index;
int count;
/* An array with a reserved entry is not empty */
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
XA_BUG_ON(xa, xa_empty(xa));
XA_BUG_ON(xa, xa_load(xa, 12345678));
xa_release(xa, 12345678);
XA_BUG_ON(xa, !xa_empty(xa));
/* Releasing a used entry does nothing */
XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_NOWAIT) != NULL);
xa_release(xa, 12345678);
xa_erase_index(xa, 12345678);
XA_BUG_ON(xa, !xa_empty(xa));
/* cmpxchg sees a reserved entry as ZERO */
XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, XA_ZERO_ENTRY,
xa_mk_value(12345678), GFP_NOWAIT) != NULL);
xa_release(xa, 12345678);
xa_erase_index(xa, 12345678);
XA_BUG_ON(xa, !xa_empty(xa));
/* xa_insert treats it as busy */
XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
XA_BUG_ON(xa, xa_insert(xa, 12345678, xa_mk_value(12345678), 0) !=
-EBUSY);
XA_BUG_ON(xa, xa_empty(xa));
XA_BUG_ON(xa, xa_erase(xa, 12345678) != NULL);
XA_BUG_ON(xa, !xa_empty(xa));
/* Can iterate through a reserved entry */
xa_store_index(xa, 5, GFP_KERNEL);
XA_BUG_ON(xa, xa_reserve(xa, 6, GFP_KERNEL) != 0);
xa_store_index(xa, 7, GFP_KERNEL);
count = 0;
xa_for_each(xa, index, entry) {
XA_BUG_ON(xa, index != 5 && index != 7);
count++;
}
XA_BUG_ON(xa, count != 2);
/* If we free a reserved entry, we should be able to allocate it */
if (xa->xa_flags & XA_FLAGS_ALLOC) {
u32 id;
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(8),
XA_LIMIT(5, 10), GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 8);
xa_release(xa, 6);
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(6),
XA_LIMIT(5, 10), GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 6);
}
xa_destroy(xa);
}
static noinline void check_xas_erase(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
void *entry;
unsigned long i, j;
for (i = 0; i < 200; i++) {
for (j = i; j < 2 * i + 17; j++) {
xas_set(&xas, j);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_index(j));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
}
xas_set(&xas, ULONG_MAX);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_value(0));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
xas_lock(&xas);
xas_store(&xas, NULL);
xas_set(&xas, 0);
j = i;
xas_for_each(&xas, entry, ULONG_MAX) {
XA_BUG_ON(xa, entry != xa_mk_index(j));
xas_store(&xas, NULL);
j++;
}
xas_unlock(&xas);
XA_BUG_ON(xa, !xa_empty(xa));
}
}
#ifdef CONFIG_XARRAY_MULTI
static noinline void check_multi_store_1(struct xarray *xa, unsigned long index,
unsigned int order)
{
XA_STATE(xas, xa, index);
unsigned long min = index & ~((1UL << order) - 1);
unsigned long max = min + (1UL << order);
xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(index));
XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(index));
XA_BUG_ON(xa, xa_load(xa, max) != NULL);
XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
xas_lock(&xas);
XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(min)) != xa_mk_index(index));
xas_unlock(&xas);
XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(min));
XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(min));
XA_BUG_ON(xa, xa_load(xa, max) != NULL);
XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
xa_erase_index(xa, min);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_multi_store_2(struct xarray *xa, unsigned long index,
unsigned int order)
{
XA_STATE(xas, xa, index);
xa_store_order(xa, index, order, xa_mk_value(0), GFP_KERNEL);
xas_lock(&xas);
XA_BUG_ON(xa, xas_store(&xas, xa_mk_value(1)) != xa_mk_value(0));
XA_BUG_ON(xa, xas.xa_index != index);
XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
xas_unlock(&xas);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_multi_store_3(struct xarray *xa, unsigned long index,
unsigned int order)
{
XA_STATE(xas, xa, 0);
void *entry;
int n = 0;
xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
xas_lock(&xas);
xas_for_each(&xas, entry, ULONG_MAX) {
XA_BUG_ON(xa, entry != xa_mk_index(index));
n++;
}
XA_BUG_ON(xa, n != 1);
xas_set(&xas, index + 1);
xas_for_each(&xas, entry, ULONG_MAX) {
XA_BUG_ON(xa, entry != xa_mk_index(index));
n++;
}
XA_BUG_ON(xa, n != 2);
xas_unlock(&xas);
xa_destroy(xa);
}
#endif
static noinline void check_multi_store(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned long i, j, k;
unsigned int max_order = (sizeof(long) == 4) ? 30 : 60;
/* Loading from any position returns the same value */
xa_store_order(xa, 0, 1, xa_mk_value(0), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 2);
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
rcu_read_unlock();
/* Storing adjacent to the value does not alter the value */
xa_store(xa, 3, xa, GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 3);
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
rcu_read_unlock();
/* Overwriting multiple indexes works */
xa_store_order(xa, 0, 2, xa_mk_value(1), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 2) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 3) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 4) != NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 4);
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 4);
rcu_read_unlock();
/* We can erase multiple values with a single store */
xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
XA_BUG_ON(xa, !xa_empty(xa));
/* Even when the first slot is empty but the others aren't */
xa_store_index(xa, 1, GFP_KERNEL);
xa_store_index(xa, 2, GFP_KERNEL);
xa_store_order(xa, 0, 2, NULL, GFP_KERNEL);
XA_BUG_ON(xa, !xa_empty(xa));
for (i = 0; i < max_order; i++) {
for (j = 0; j < max_order; j++) {
xa_store_order(xa, 0, i, xa_mk_index(i), GFP_KERNEL);
xa_store_order(xa, 0, j, xa_mk_index(j), GFP_KERNEL);
for (k = 0; k < max_order; k++) {
void *entry = xa_load(xa, (1UL << k) - 1);
if ((i < k) && (j < k))
XA_BUG_ON(xa, entry != NULL);
else
XA_BUG_ON(xa, entry != xa_mk_index(j));
}
xa_erase(xa, 0);
XA_BUG_ON(xa, !xa_empty(xa));
}
}
for (i = 0; i < 20; i++) {
check_multi_store_1(xa, 200, i);
check_multi_store_1(xa, 0, i);
check_multi_store_1(xa, (1UL << i) + 1, i);
}
check_multi_store_2(xa, 4095, 9);
for (i = 1; i < 20; i++) {
check_multi_store_3(xa, 0, i);
check_multi_store_3(xa, 1UL << i, i);
}
#endif
}
static noinline void check_xa_alloc_1(struct xarray *xa, unsigned int base)
{
int i;
u32 id;
XA_BUG_ON(xa, !xa_empty(xa));
/* An empty array should assign %base to the first alloc */
xa_alloc_index(xa, base, GFP_KERNEL);
/* Erasing it should make the array empty again */
xa_erase_index(xa, base);
XA_BUG_ON(xa, !xa_empty(xa));
/* And it should assign %base again */
xa_alloc_index(xa, base, GFP_KERNEL);
/* Allocating and then erasing a lot should not lose base */
for (i = base + 1; i < 2 * XA_CHUNK_SIZE; i++)
xa_alloc_index(xa, i, GFP_KERNEL);
for (i = base; i < 2 * XA_CHUNK_SIZE; i++)
xa_erase_index(xa, i);
xa_alloc_index(xa, base, GFP_KERNEL);
/* Destroying the array should do the same as erasing */
xa_destroy(xa);
/* And it should assign %base again */
xa_alloc_index(xa, base, GFP_KERNEL);
/* The next assigned ID should be base+1 */
xa_alloc_index(xa, base + 1, GFP_KERNEL);
xa_erase_index(xa, base + 1);
/* Storing a value should mark it used */
xa_store_index(xa, base + 1, GFP_KERNEL);
xa_alloc_index(xa, base + 2, GFP_KERNEL);
/* If we then erase base, it should be free */
xa_erase_index(xa, base);
xa_alloc_index(xa, base, GFP_KERNEL);
xa_erase_index(xa, base + 1);
xa_erase_index(xa, base + 2);
for (i = 1; i < 5000; i++) {
xa_alloc_index(xa, base + i, GFP_KERNEL);
}
xa_destroy(xa);
/* Check that we fail properly at the limit of allocation */
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(UINT_MAX - 1),
XA_LIMIT(UINT_MAX - 1, UINT_MAX),
GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 0xfffffffeU);
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(UINT_MAX),
XA_LIMIT(UINT_MAX - 1, UINT_MAX),
GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 0xffffffffU);
id = 3;
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(0),
XA_LIMIT(UINT_MAX - 1, UINT_MAX),
GFP_KERNEL) != -EBUSY);
XA_BUG_ON(xa, id != 3);
xa_destroy(xa);
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(10), XA_LIMIT(10, 5),
GFP_KERNEL) != -EBUSY);
XA_BUG_ON(xa, xa_store_index(xa, 3, GFP_KERNEL) != 0);
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(10), XA_LIMIT(10, 5),
GFP_KERNEL) != -EBUSY);
xa_erase_index(xa, 3);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_xa_alloc_2(struct xarray *xa, unsigned int base)
{
unsigned int i, id;
unsigned long index;
void *entry;
/* Allocate and free a NULL and check xa_empty() behaves */
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != base);
XA_BUG_ON(xa, xa_empty(xa));
XA_BUG_ON(xa, xa_erase(xa, id) != NULL);
XA_BUG_ON(xa, !xa_empty(xa));
/* Ditto, but check destroy instead of erase */
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != base);
XA_BUG_ON(xa, xa_empty(xa));
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
for (i = base; i < base + 10; i++) {
XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b,
GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != i);
}
XA_BUG_ON(xa, xa_store(xa, 3, xa_mk_index(3), GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_store(xa, 4, xa_mk_index(4), GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_store(xa, 4, NULL, GFP_KERNEL) != xa_mk_index(4));
XA_BUG_ON(xa, xa_erase(xa, 5) != NULL);
XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 5);
xa_for_each(xa, index, entry) {
xa_erase_index(xa, index);
}
for (i = base; i < base + 9; i++) {
XA_BUG_ON(xa, xa_erase(xa, i) != NULL);
XA_BUG_ON(xa, xa_empty(xa));
}
XA_BUG_ON(xa, xa_erase(xa, 8) != NULL);
XA_BUG_ON(xa, xa_empty(xa));
XA_BUG_ON(xa, xa_erase(xa, base + 9) != NULL);
XA_BUG_ON(xa, !xa_empty(xa));
xa_destroy(xa);
}
static noinline void check_xa_alloc_3(struct xarray *xa, unsigned int base)
{
struct xa_limit limit = XA_LIMIT(1, 0x3fff);
u32 next = 0;
unsigned int i, id;
unsigned long index;
void *entry;
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(1), limit,
&next, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 1);
next = 0x3ffd;
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(0x3ffd), limit,
&next, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 0x3ffd);
xa_erase_index(xa, 0x3ffd);
xa_erase_index(xa, 1);
XA_BUG_ON(xa, !xa_empty(xa));
for (i = 0x3ffe; i < 0x4003; i++) {
if (i < 0x4000)
entry = xa_mk_index(i);
else
entry = xa_mk_index(i - 0x3fff);
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, entry, limit,
&next, GFP_KERNEL) != (id == 1));
XA_BUG_ON(xa, xa_mk_index(id) != entry);
}
/* Check wrap-around is handled correctly */
if (base != 0)
xa_erase_index(xa, base);
xa_erase_index(xa, base + 1);
next = UINT_MAX;
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(UINT_MAX),
xa_limit_32b, &next, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != UINT_MAX);
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(base),
xa_limit_32b, &next, GFP_KERNEL) != 1);
XA_BUG_ON(xa, id != base);
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(base + 1),
xa_limit_32b, &next, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != base + 1);
xa_for_each(xa, index, entry)
xa_erase_index(xa, index);
XA_BUG_ON(xa, !xa_empty(xa));
}
static DEFINE_XARRAY_ALLOC(xa0);
static DEFINE_XARRAY_ALLOC1(xa1);
static noinline void check_xa_alloc(void)
{
check_xa_alloc_1(&xa0, 0);
check_xa_alloc_1(&xa1, 1);
check_xa_alloc_2(&xa0, 0);
check_xa_alloc_2(&xa1, 1);
check_xa_alloc_3(&xa0, 0);
check_xa_alloc_3(&xa1, 1);
}
static noinline void __check_store_iter(struct xarray *xa, unsigned long start,
unsigned int order, unsigned int present)
{
XA_STATE_ORDER(xas, xa, start, order);
void *entry;
unsigned int count = 0;
retry:
xas_lock(&xas);
xas_for_each_conflict(&xas, entry) {
XA_BUG_ON(xa, !xa_is_value(entry));
XA_BUG_ON(xa, entry < xa_mk_index(start));
XA_BUG_ON(xa, entry > xa_mk_index(start + (1UL << order) - 1));
count++;
}
xas_store(&xas, xa_mk_index(start));
xas_unlock(&xas);
if (xas_nomem(&xas, GFP_KERNEL)) {
count = 0;
goto retry;
}
XA_BUG_ON(xa, xas_error(&xas));
XA_BUG_ON(xa, count != present);
XA_BUG_ON(xa, xa_load(xa, start) != xa_mk_index(start));
XA_BUG_ON(xa, xa_load(xa, start + (1UL << order) - 1) !=
xa_mk_index(start));
xa_erase_index(xa, start);
}
static noinline void check_store_iter(struct xarray *xa)
{
unsigned int i, j;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
for (i = 0; i < max_order; i++) {
unsigned int min = 1 << i;
unsigned int max = (2 << i) - 1;
__check_store_iter(xa, 0, i, 0);
XA_BUG_ON(xa, !xa_empty(xa));
__check_store_iter(xa, min, i, 0);
XA_BUG_ON(xa, !xa_empty(xa));
xa_store_index(xa, min, GFP_KERNEL);
__check_store_iter(xa, min, i, 1);
XA_BUG_ON(xa, !xa_empty(xa));
xa_store_index(xa, max, GFP_KERNEL);
__check_store_iter(xa, min, i, 1);
XA_BUG_ON(xa, !xa_empty(xa));
for (j = 0; j < min; j++)
xa_store_index(xa, j, GFP_KERNEL);
__check_store_iter(xa, 0, i, min);
XA_BUG_ON(xa, !xa_empty(xa));
for (j = 0; j < min; j++)
xa_store_index(xa, min + j, GFP_KERNEL);
__check_store_iter(xa, min, i, min);
XA_BUG_ON(xa, !xa_empty(xa));
}
#ifdef CONFIG_XARRAY_MULTI
xa_store_index(xa, 63, GFP_KERNEL);
xa_store_index(xa, 65, GFP_KERNEL);
__check_store_iter(xa, 64, 2, 1);
xa_erase_index(xa, 63);
#endif
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_multi_find_1(struct xarray *xa, unsigned order)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned long multi = 3 << order;
unsigned long next = 4 << order;
unsigned long index;
xa_store_order(xa, multi, order, xa_mk_value(multi), GFP_KERNEL);
XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_store_index(xa, next + 1, GFP_KERNEL) != NULL);
index = 0;
XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(multi));
XA_BUG_ON(xa, index != multi);
index = multi + 1;
XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(multi));
XA_BUG_ON(xa, (index < multi) || (index >= next));
XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(next));
XA_BUG_ON(xa, index != next);
XA_BUG_ON(xa, xa_find_after(xa, &index, next, XA_PRESENT) != NULL);
XA_BUG_ON(xa, index != next);
xa_erase_index(xa, multi);
xa_erase_index(xa, next);
xa_erase_index(xa, next + 1);
XA_BUG_ON(xa, !xa_empty(xa));
#endif
}
static noinline void check_multi_find_2(struct xarray *xa)
{
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 10 : 1;
unsigned int i, j;
void *entry;
for (i = 0; i < max_order; i++) {
unsigned long index = 1UL << i;
for (j = 0; j < index; j++) {
XA_STATE(xas, xa, j + index);
xa_store_index(xa, index - 1, GFP_KERNEL);
xa_store_order(xa, index, i, xa_mk_index(index),
GFP_KERNEL);
rcu_read_lock();
xas_for_each(&xas, entry, ULONG_MAX) {
xa_erase_index(xa, index);
}
rcu_read_unlock();
xa_erase_index(xa, index - 1);
XA_BUG_ON(xa, !xa_empty(xa));
}
}
}
static noinline void check_multi_find_3(struct xarray *xa)
{
unsigned int order;
for (order = 5; order < order_limit; order++) {
unsigned long index = 1UL << (order - 5);
XA_BUG_ON(xa, !xa_empty(xa));
xa_store_order(xa, 0, order - 4, xa_mk_index(0), GFP_KERNEL);
XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT));
xa_erase_index(xa, 0);
}
}
static noinline void check_find_1(struct xarray *xa)
{
unsigned long i, j, k;
XA_BUG_ON(xa, !xa_empty(xa));
/*
* Check xa_find with all pairs between 0 and 99 inclusive,
* starting at every index between 0 and 99
*/
for (i = 0; i < 100; i++) {
XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
xa_set_mark(xa, i, XA_MARK_0);
for (j = 0; j < i; j++) {
XA_BUG_ON(xa, xa_store_index(xa, j, GFP_KERNEL) !=
NULL);
xa_set_mark(xa, j, XA_MARK_0);
for (k = 0; k < 100; k++) {
unsigned long index = k;
void *entry = xa_find(xa, &index, ULONG_MAX,
XA_PRESENT);
if (k <= j)