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linux/lib/test_xarray.c
Matthew Wilcox 0e9446c35a xarray: Add range store functionality 
This version of xa_store_range() really only supports load and store.
Our only user only needs basic load and store functionality, so there's
no need to do the extra work to support marking and overlapping stores
correctly yet.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-10-21 10:46:46 -04:00

1239 lines
32 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
/*
* test_xarray.c: Test the XArray API
* Copyright (c) 2017-2018 Microsoft Corporation
* Author: Matthew Wilcox <willy@infradead.org>
*/
#include <linux/xarray.h>
#include <linux/module.h>
static unsigned int tests_run;
static unsigned int tests_passed;
#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_store_index(struct xarray *xa, unsigned long index, gfp_t gfp)
{
return xa_store(xa, index, xa_mk_value(index & LONG_MAX), gfp);
}
static void xa_alloc_index(struct xarray *xa, unsigned long index, gfp_t gfp)
{
u32 id = 0;
XA_BUG_ON(xa, xa_alloc(xa, &id, UINT_MAX, xa_mk_value(index & LONG_MAX),
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_value(index & LONG_MAX));
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);
XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
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_value(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_1);
XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL));
xa_store_order(xa, index, order, xa_mk_value(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 */
xas_for_each(&xas, entry, ULONG_MAX)
seen++;
XA_BUG_ON(xa, seen != 2);
/* One of which is marked */
xas_set(&xas, 0);
seen = 0;
xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
seen++;
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_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) != -EEXIST);
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 = 0;
/* An array with a reserved entry is not empty */
XA_BUG_ON(xa, !xa_empty(xa));
xa_reserve(xa, 12345678, GFP_KERNEL);
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_reserve(xa, 12345678, GFP_KERNEL);
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 NULL */
xa_reserve(xa, 12345678, GFP_KERNEL);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, NULL, xa_mk_value(12345678),
GFP_NOWAIT) != NULL);
xa_release(xa, 12345678);
xa_erase_index(xa, 12345678);
XA_BUG_ON(xa, !xa_empty(xa));
/* Can iterate through a reserved entry */
xa_store_index(xa, 5, GFP_KERNEL);
xa_reserve(xa, 6, GFP_KERNEL);
xa_store_index(xa, 7, GFP_KERNEL);
xa_for_each(xa, entry, index, ULONG_MAX, XA_PRESENT) {
XA_BUG_ON(xa, index != 5 && index != 7);
}
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_value(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_value(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_value(index), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_value(index));
XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_value(index));
XA_BUG_ON(xa, xa_load(xa, max) != NULL);
XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
XA_BUG_ON(xa, xas_store(&xas, xa_mk_value(min)) != xa_mk_value(index));
XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_value(min));
XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_value(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);
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));
XA_BUG_ON(xa, !xa_empty(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, 63, 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_value(i), GFP_KERNEL);
xa_store_order(xa, 0, j, xa_mk_value(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_value(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);
#endif
}
static DEFINE_XARRAY_ALLOC(xa0);
static noinline void check_xa_alloc(void)
{
int i;
u32 id;
/* An empty array should assign 0 to the first alloc */
xa_alloc_index(&xa0, 0, GFP_KERNEL);
/* Erasing it should make the array empty again */
xa_erase_index(&xa0, 0);
XA_BUG_ON(&xa0, !xa_empty(&xa0));
/* And it should assign 0 again */
xa_alloc_index(&xa0, 0, GFP_KERNEL);
/* The next assigned ID should be 1 */
xa_alloc_index(&xa0, 1, GFP_KERNEL);
xa_erase_index(&xa0, 1);
/* Storing a value should mark it used */
xa_store_index(&xa0, 1, GFP_KERNEL);
xa_alloc_index(&xa0, 2, GFP_KERNEL);
/* If we then erase 0, it should be free */
xa_erase_index(&xa0, 0);
xa_alloc_index(&xa0, 0, GFP_KERNEL);
xa_erase_index(&xa0, 1);
xa_erase_index(&xa0, 2);
for (i = 1; i < 5000; i++) {
xa_alloc_index(&xa0, i, GFP_KERNEL);
}
xa_destroy(&xa0);
id = 0xfffffffeU;
XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, UINT_MAX, xa_mk_value(0),
GFP_KERNEL) != 0);
XA_BUG_ON(&xa0, id != 0xfffffffeU);
XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, UINT_MAX, xa_mk_value(0),
GFP_KERNEL) != 0);
XA_BUG_ON(&xa0, id != 0xffffffffU);
XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, UINT_MAX, xa_mk_value(0),
GFP_KERNEL) != -ENOSPC);
XA_BUG_ON(&xa0, id != 0xffffffffU);
xa_destroy(&xa0);
}
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_value(start));
XA_BUG_ON(xa, entry > xa_mk_value(start + (1UL << order) - 1));
count++;
}
xas_store(&xas, xa_mk_value(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_value(start));
XA_BUG_ON(xa, xa_load(xa, start + (1UL << order) - 1) !=
xa_mk_value(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(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned long index;
xa_store_order(xa, 12, 2, xa_mk_value(12), GFP_KERNEL);
XA_BUG_ON(xa, xa_store_index(xa, 16, GFP_KERNEL) != NULL);
index = 0;
XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(12));
XA_BUG_ON(xa, index != 12);
index = 13;
XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(12));
XA_BUG_ON(xa, (index < 12) || (index >= 16));
XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(16));
XA_BUG_ON(xa, index != 16);
xa_erase_index(xa, 12);
xa_erase_index(xa, 16);
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_value(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_find(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)
XA_BUG_ON(xa, index != j);
else if (k <= i)
XA_BUG_ON(xa, index != i);
else
XA_BUG_ON(xa, entry != NULL);
index = k;
entry = xa_find(xa, &index, ULONG_MAX,
XA_MARK_0);
if (k <= j)
XA_BUG_ON(xa, index != j);
else if (k <= i)
XA_BUG_ON(xa, index != i);
else
XA_BUG_ON(xa, entry != NULL);
}
xa_erase_index(xa, j);
XA_BUG_ON(xa, xa_get_mark(xa, j, XA_MARK_0));
XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
}
xa_erase_index(xa, i);
XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_0));
}
XA_BUG_ON(xa, !xa_empty(xa));
check_multi_find(xa);
check_multi_find_2(xa);
}
/* See find_swap_entry() in mm/shmem.c */
static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
{
XA_STATE(xas, xa, 0);
unsigned int checked = 0;
void *entry;
rcu_read_lock();
xas_for_each(&xas, entry, ULONG_MAX) {
if (xas_retry(&xas, entry))
continue;
if (entry == item)
break;
checked++;
if ((checked % 4) != 0)
continue;
xas_pause(&xas);
}
rcu_read_unlock();
return entry ? xas.xa_index : -1;
}
static noinline void check_find_entry(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned int order;
unsigned long offset, index;
for (order = 0; order < 20; order++) {
for (offset = 0; offset < (1UL << (order + 3));
offset += (1UL << order)) {
for (index = 0; index < (1UL << (order + 5));
index += (1UL << order)) {
xa_store_order(xa, index, order,
xa_mk_value(index), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, index) !=
xa_mk_value(index));
XA_BUG_ON(xa, xa_find_entry(xa,
xa_mk_value(index)) != index);
}
XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
xa_destroy(xa);
}
}
#endif
XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
XA_BUG_ON(xa, xa_find_entry(xa, xa_mk_value(LONG_MAX)) != -1);
xa_erase_index(xa, ULONG_MAX);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_move_small(struct xarray *xa, unsigned long idx)
{
XA_STATE(xas, xa, 0);
unsigned long i;
xa_store_index(xa, 0, GFP_KERNEL);
xa_store_index(xa, idx, GFP_KERNEL);
rcu_read_lock();
for (i = 0; i < idx * 4; i++) {
void *entry = xas_next(&xas);
if (i <= idx)
XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
XA_BUG_ON(xa, xas.xa_index != i);
if (i == 0 || i == idx)
XA_BUG_ON(xa, entry != xa_mk_value(i));
else
XA_BUG_ON(xa, entry != NULL);
}
xas_next(&xas);
XA_BUG_ON(xa, xas.xa_index != i);
do {
void *entry = xas_prev(&xas);
i--;
if (i <= idx)
XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
XA_BUG_ON(xa, xas.xa_index != i);
if (i == 0 || i == idx)
XA_BUG_ON(xa, entry != xa_mk_value(i));
else
XA_BUG_ON(xa, entry != NULL);
} while (i > 0);
xas_set(&xas, ULONG_MAX);
XA_BUG_ON(xa, xas_next(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
XA_BUG_ON(xa, xas_next(&xas) != xa_mk_value(0));
XA_BUG_ON(xa, xas.xa_index != 0);
XA_BUG_ON(xa, xas_prev(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
rcu_read_unlock();
xa_erase_index(xa, 0);
xa_erase_index(xa, idx);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_move(struct xarray *xa)
{
XA_STATE(xas, xa, (1 << 16) - 1);
unsigned long i;
for (i = 0; i < (1 << 16); i++)
XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
rcu_read_lock();
do {
void *entry = xas_prev(&xas);
i--;
XA_BUG_ON(xa, entry != xa_mk_value(i));
XA_BUG_ON(xa, i != xas.xa_index);
} while (i != 0);
XA_BUG_ON(xa, xas_prev(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
do {
void *entry = xas_next(&xas);
XA_BUG_ON(xa, entry != xa_mk_value(i));
XA_BUG_ON(xa, i != xas.xa_index);
i++;
} while (i < (1 << 16));
rcu_read_unlock();
for (i = (1 << 8); i < (1 << 15); i++)
xa_erase_index(xa, i);
i = xas.xa_index;
rcu_read_lock();
do {
void *entry = xas_prev(&xas);
i--;
if ((i < (1 << 8)) || (i >= (1 << 15)))
XA_BUG_ON(xa, entry != xa_mk_value(i));
else
XA_BUG_ON(xa, entry != NULL);
XA_BUG_ON(xa, i != xas.xa_index);
} while (i != 0);
XA_BUG_ON(xa, xas_prev(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
do {
void *entry = xas_next(&xas);
if ((i < (1 << 8)) || (i >= (1 << 15)))
XA_BUG_ON(xa, entry != xa_mk_value(i));
else
XA_BUG_ON(xa, entry != NULL);
XA_BUG_ON(xa, i != xas.xa_index);
i++;
} while (i < (1 << 16));
rcu_read_unlock();
xa_destroy(xa);
for (i = 0; i < 16; i++)
check_move_small(xa, 1UL << i);
for (i = 2; i < 16; i++)
check_move_small(xa, (1UL << i) - 1);
}
static noinline void xa_store_many_order(struct xarray *xa,
unsigned long index, unsigned order)
{
XA_STATE_ORDER(xas, xa, index, order);
unsigned int i = 0;
do {
xas_lock(&xas);
XA_BUG_ON(xa, xas_find_conflict(&xas));
xas_create_range(&xas);
if (xas_error(&xas))
goto unlock;
for (i = 0; i < (1U << order); i++) {
XA_BUG_ON(xa, xas_store(&xas, xa_mk_value(index + i)));
xas_next(&xas);
}
unlock:
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
XA_BUG_ON(xa, xas_error(&xas));
}
static noinline void check_create_range_1(struct xarray *xa,
unsigned long index, unsigned order)
{
unsigned long i;
xa_store_many_order(xa, index, order);
for (i = index; i < index + (1UL << order); i++)
xa_erase_index(xa, i);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_create_range_2(struct xarray *xa, unsigned order)
{
unsigned long i;
unsigned long nr = 1UL << order;
for (i = 0; i < nr * nr; i += nr)
xa_store_many_order(xa, i, order);
for (i = 0; i < nr * nr; i++)
xa_erase_index(xa, i);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_create_range_3(void)
{
XA_STATE(xas, NULL, 0);
xas_set_err(&xas, -EEXIST);
xas_create_range(&xas);
XA_BUG_ON(NULL, xas_error(&xas) != -EEXIST);
}
static noinline void check_create_range_4(struct xarray *xa,
unsigned long index, unsigned order)
{
XA_STATE_ORDER(xas, xa, index, order);
unsigned long base = xas.xa_index;
unsigned long i = 0;
xa_store_index(xa, index, GFP_KERNEL);
do {
xas_lock(&xas);
xas_create_range(&xas);
if (xas_error(&xas))
goto unlock;
for (i = 0; i < (1UL << order); i++) {
void *old = xas_store(&xas, xa_mk_value(base + i));
if (xas.xa_index == index)
XA_BUG_ON(xa, old != xa_mk_value(base + i));
else
XA_BUG_ON(xa, old != NULL);
xas_next(&xas);
}
unlock:
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
XA_BUG_ON(xa, xas_error(&xas));
for (i = base; i < base + (1UL << order); i++)
xa_erase_index(xa, i);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_create_range(struct xarray *xa)
{
unsigned int order;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 12 : 1;
for (order = 0; order < max_order; order++) {
check_create_range_1(xa, 0, order);
check_create_range_1(xa, 1U << order, order);
check_create_range_1(xa, 2U << order, order);
check_create_range_1(xa, 3U << order, order);
check_create_range_1(xa, 1U << 24, order);
if (order < 10)
check_create_range_2(xa, order);
check_create_range_4(xa, 0, order);
check_create_range_4(xa, 1U << order, order);
check_create_range_4(xa, 2U << order, order);
check_create_range_4(xa, 3U << order, order);
check_create_range_4(xa, 1U << 24, order);
check_create_range_4(xa, 1, order);
check_create_range_4(xa, (1U << order) + 1, order);
check_create_range_4(xa, (2U << order) + 1, order);
check_create_range_4(xa, (2U << order) - 1, order);
check_create_range_4(xa, (3U << order) + 1, order);
check_create_range_4(xa, (3U << order) - 1, order);
check_create_range_4(xa, (1U << 24) + 1, order);
}
check_create_range_3();
}
static noinline void __check_store_range(struct xarray *xa, unsigned long first,
unsigned long last)
{
#ifdef CONFIG_XARRAY_MULTI
xa_store_range(xa, first, last, xa_mk_value(first), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, first) != xa_mk_value(first));
XA_BUG_ON(xa, xa_load(xa, last) != xa_mk_value(first));
XA_BUG_ON(xa, xa_load(xa, first - 1) != NULL);
XA_BUG_ON(xa, xa_load(xa, last + 1) != NULL);
xa_store_range(xa, first, last, NULL, GFP_KERNEL);
#endif
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_store_range(struct xarray *xa)
{
unsigned long i, j;
for (i = 0; i < 128; i++) {
for (j = i; j < 128; j++) {
__check_store_range(xa, i, j);
__check_store_range(xa, 128 + i, 128 + j);
__check_store_range(xa, 4095 + i, 4095 + j);
__check_store_range(xa, 4096 + i, 4096 + j);
__check_store_range(xa, 123456 + i, 123456 + j);
__check_store_range(xa, UINT_MAX + i, UINT_MAX + j);
}
}
}
static LIST_HEAD(shadow_nodes);
static void test_update_node(struct xa_node *node)
{
if (node->count && node->count == node->nr_values) {
if (list_empty(&node->private_list))
list_add(&shadow_nodes, &node->private_list);
} else {
if (!list_empty(&node->private_list))
list_del_init(&node->private_list);
}
}
static noinline void shadow_remove(struct xarray *xa)
{
struct xa_node *node;
xa_lock(xa);
while ((node = list_first_entry_or_null(&shadow_nodes,
struct xa_node, private_list))) {
XA_STATE(xas, node->array, 0);
XA_BUG_ON(xa, node->array != xa);
list_del_init(&node->private_list);
xas.xa_node = xa_parent_locked(node->array, node);
xas.xa_offset = node->offset;
xas.xa_shift = node->shift + XA_CHUNK_SHIFT;
xas_set_update(&xas, test_update_node);
xas_store(&xas, NULL);
}
xa_unlock(xa);
}
static noinline void check_workingset(struct xarray *xa, unsigned long index)
{
XA_STATE(xas, xa, index);
xas_set_update(&xas, test_update_node);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_value(0));
xas_next(&xas);
xas_store(&xas, xa_mk_value(1));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
XA_BUG_ON(xa, list_empty(&shadow_nodes));
xas_lock(&xas);
xas_next(&xas);
xas_store(&xas, &xas);
XA_BUG_ON(xa, !list_empty(&shadow_nodes));
xas_store(&xas, xa_mk_value(2));
xas_unlock(&xas);
XA_BUG_ON(xa, list_empty(&shadow_nodes));
shadow_remove(xa);
XA_BUG_ON(xa, !list_empty(&shadow_nodes));
XA_BUG_ON(xa, !xa_empty(xa));
}
/*
* Check that the pointer / value / sibling entries are accounted the
* way we expect them to be.
*/
static noinline void check_account(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned int order;
for (order = 1; order < 12; order++) {
XA_STATE(xas, xa, 1 << order);
xa_store_order(xa, 0, order, xa, GFP_KERNEL);
xas_load(&xas);
XA_BUG_ON(xa, xas.xa_node->count == 0);
XA_BUG_ON(xa, xas.xa_node->count > (1 << order));
XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
xa_store_order(xa, 1 << order, order, xa_mk_value(1 << order),
GFP_KERNEL);
XA_BUG_ON(xa, xas.xa_node->count != xas.xa_node->nr_values * 2);
xa_erase(xa, 1 << order);
XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
xa_erase(xa, 0);
XA_BUG_ON(xa, !xa_empty(xa));
}
#endif
}
static noinline void check_destroy(struct xarray *xa)
{
unsigned long index;
XA_BUG_ON(xa, !xa_empty(xa));
/* Destroying an empty array is a no-op */
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
/* Destroying an array with a single entry */
for (index = 0; index < 1000; index++) {
xa_store_index(xa, index, GFP_KERNEL);
XA_BUG_ON(xa, xa_empty(xa));
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
}
/* Destroying an array with a single entry at ULONG_MAX */
xa_store(xa, ULONG_MAX, xa, GFP_KERNEL);
XA_BUG_ON(xa, xa_empty(xa));
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
#ifdef CONFIG_XARRAY_MULTI
/* Destroying an array with a multi-index entry */
xa_store_order(xa, 1 << 11, 11, xa, GFP_KERNEL);
XA_BUG_ON(xa, xa_empty(xa));
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
#endif
}
static DEFINE_XARRAY(array);
static int xarray_checks(void)
{
check_xa_err(&array);
check_xas_retry(&array);
check_xa_load(&array);
check_xa_mark(&array);
check_xa_shrink(&array);
check_xas_erase(&array);
check_cmpxchg(&array);
check_reserve(&array);
check_multi_store(&array);
check_xa_alloc();
check_find(&array);
check_find_entry(&array);
check_account(&array);
check_destroy(&array);
check_move(&array);
check_create_range(&array);
check_store_range(&array);
check_store_iter(&array);
check_workingset(&array, 0);
check_workingset(&array, 64);
check_workingset(&array, 4096);
printk("XArray: %u of %u tests passed\n", tests_passed, tests_run);
return (tests_run == tests_passed) ? 0 : -EINVAL;
}
static void xarray_exit(void)
{
}
module_init(xarray_checks);
module_exit(xarray_exit);
MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
MODULE_LICENSE("GPL");
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