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v5.4
  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * test_ida.c: Test the IDA API
  4 * Copyright (c) 2016-2018 Microsoft Corporation
  5 * Copyright (c) 2018 Oracle Corporation
  6 * Author: Matthew Wilcox <willy@infradead.org>
  7 */
  8
  9#include <linux/idr.h>
 10#include <linux/module.h>
 11
 12static unsigned int tests_run;
 13static unsigned int tests_passed;
 14
 15#ifdef __KERNEL__
 16void ida_dump(struct ida *ida) { }
 17#endif
 18#define IDA_BUG_ON(ida, x) do {						\
 19	tests_run++;							\
 20	if (x) {							\
 21		ida_dump(ida);						\
 22		dump_stack();						\
 23	} else {							\
 24		tests_passed++;						\
 25	}								\
 26} while (0)
 27
 28/*
 29 * Straightforward checks that allocating and freeing IDs work.
 30 */
 31static void ida_check_alloc(struct ida *ida)
 32{
 33	int i, id;
 34
 35	for (i = 0; i < 10000; i++)
 36		IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != i);
 37
 38	ida_free(ida, 20);
 39	ida_free(ida, 21);
 40	for (i = 0; i < 3; i++) {
 41		id = ida_alloc(ida, GFP_KERNEL);
 42		IDA_BUG_ON(ida, id < 0);
 43		if (i == 2)
 44			IDA_BUG_ON(ida, id != 10000);
 45	}
 46
 47	for (i = 0; i < 5000; i++)
 48		ida_free(ida, i);
 49
 50	IDA_BUG_ON(ida, ida_alloc_min(ida, 5000, GFP_KERNEL) != 10001);
 51	ida_destroy(ida);
 52
 53	IDA_BUG_ON(ida, !ida_is_empty(ida));
 54}
 55
 56/* Destroy an IDA with a single entry at @base */
 57static void ida_check_destroy_1(struct ida *ida, unsigned int base)
 58{
 59	IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) != base);
 60	IDA_BUG_ON(ida, ida_is_empty(ida));
 61	ida_destroy(ida);
 62	IDA_BUG_ON(ida, !ida_is_empty(ida));
 63}
 64
 65/* Check that ida_destroy and ida_is_empty work */
 66static void ida_check_destroy(struct ida *ida)
 67{
 68	/* Destroy an already-empty IDA */
 69	IDA_BUG_ON(ida, !ida_is_empty(ida));
 70	ida_destroy(ida);
 71	IDA_BUG_ON(ida, !ida_is_empty(ida));
 72
 73	ida_check_destroy_1(ida, 0);
 74	ida_check_destroy_1(ida, 1);
 75	ida_check_destroy_1(ida, 1023);
 76	ida_check_destroy_1(ida, 1024);
 77	ida_check_destroy_1(ida, 12345678);
 78}
 79
 80/*
 81 * Check what happens when we fill a leaf and then delete it.  This may
 82 * discover mishandling of IDR_FREE.
 83 */
 84static void ida_check_leaf(struct ida *ida, unsigned int base)
 85{
 86	unsigned long i;
 87
 88	for (i = 0; i < IDA_BITMAP_BITS; i++) {
 89		IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) !=
 90				base + i);
 91	}
 92
 93	ida_destroy(ida);
 94	IDA_BUG_ON(ida, !ida_is_empty(ida));
 95
 96	IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != 0);
 97	IDA_BUG_ON(ida, ida_is_empty(ida));
 98	ida_free(ida, 0);
 99	IDA_BUG_ON(ida, !ida_is_empty(ida));
100}
101
102/*
103 * Check allocations up to and slightly above the maximum allowed (2^31-1) ID.
104 * Allocating up to 2^31-1 should succeed, and then allocating the next one
105 * should fail.
106 */
107static void ida_check_max(struct ida *ida)
108{
109	unsigned long i, j;
110
111	for (j = 1; j < 65537; j *= 2) {
112		unsigned long base = (1UL << 31) - j;
113		for (i = 0; i < j; i++) {
114			IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) !=
115					base + i);
116		}
117		IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) !=
118				-ENOSPC);
119		ida_destroy(ida);
120		IDA_BUG_ON(ida, !ida_is_empty(ida));
121	}
122}
123
124/*
125 * Check handling of conversions between exceptional entries and full bitmaps.
126 */
127static void ida_check_conv(struct ida *ida)
128{
129	unsigned long i;
130
131	for (i = 0; i < IDA_BITMAP_BITS * 2; i += IDA_BITMAP_BITS) {
132		IDA_BUG_ON(ida, ida_alloc_min(ida, i + 1, GFP_KERNEL) != i + 1);
133		IDA_BUG_ON(ida, ida_alloc_min(ida, i + BITS_PER_LONG,
134					GFP_KERNEL) != i + BITS_PER_LONG);
135		ida_free(ida, i + 1);
136		ida_free(ida, i + BITS_PER_LONG);
137		IDA_BUG_ON(ida, !ida_is_empty(ida));
138	}
139
140	for (i = 0; i < IDA_BITMAP_BITS * 2; i++)
141		IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != i);
142	for (i = IDA_BITMAP_BITS * 2; i > 0; i--)
143		ida_free(ida, i - 1);
144	IDA_BUG_ON(ida, !ida_is_empty(ida));
145
146	for (i = 0; i < IDA_BITMAP_BITS + BITS_PER_LONG - 4; i++)
147		IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != i);
148	for (i = IDA_BITMAP_BITS + BITS_PER_LONG - 4; i > 0; i--)
149		ida_free(ida, i - 1);
150	IDA_BUG_ON(ida, !ida_is_empty(ida));
151}
152
153static DEFINE_IDA(ida);
154
155static int ida_checks(void)
156{
157	IDA_BUG_ON(&ida, !ida_is_empty(&ida));
158	ida_check_alloc(&ida);
159	ida_check_destroy(&ida);
160	ida_check_leaf(&ida, 0);
161	ida_check_leaf(&ida, 1024);
162	ida_check_leaf(&ida, 1024 * 64);
163	ida_check_max(&ida);
164	ida_check_conv(&ida);
165
166	printk("IDA: %u of %u tests passed\n", tests_passed, tests_run);
167	return (tests_run != tests_passed) ? 0 : -EINVAL;
168}
169
170static void ida_exit(void)
171{
172}
173
174module_init(ida_checks);
175module_exit(ida_exit);
176MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
177MODULE_LICENSE("GPL");
v6.2
  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * test_ida.c: Test the IDA API
  4 * Copyright (c) 2016-2018 Microsoft Corporation
  5 * Copyright (c) 2018 Oracle Corporation
  6 * Author: Matthew Wilcox <willy@infradead.org>
  7 */
  8
  9#include <linux/idr.h>
 10#include <linux/module.h>
 11
 12static unsigned int tests_run;
 13static unsigned int tests_passed;
 14
 15#ifdef __KERNEL__
 16void ida_dump(struct ida *ida) { }
 17#endif
 18#define IDA_BUG_ON(ida, x) do {						\
 19	tests_run++;							\
 20	if (x) {							\
 21		ida_dump(ida);						\
 22		dump_stack();						\
 23	} else {							\
 24		tests_passed++;						\
 25	}								\
 26} while (0)
 27
 28/*
 29 * Straightforward checks that allocating and freeing IDs work.
 30 */
 31static void ida_check_alloc(struct ida *ida)
 32{
 33	int i, id;
 34
 35	for (i = 0; i < 10000; i++)
 36		IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != i);
 37
 38	ida_free(ida, 20);
 39	ida_free(ida, 21);
 40	for (i = 0; i < 3; i++) {
 41		id = ida_alloc(ida, GFP_KERNEL);
 42		IDA_BUG_ON(ida, id < 0);
 43		if (i == 2)
 44			IDA_BUG_ON(ida, id != 10000);
 45	}
 46
 47	for (i = 0; i < 5000; i++)
 48		ida_free(ida, i);
 49
 50	IDA_BUG_ON(ida, ida_alloc_min(ida, 5000, GFP_KERNEL) != 10001);
 51	ida_destroy(ida);
 52
 53	IDA_BUG_ON(ida, !ida_is_empty(ida));
 54}
 55
 56/* Destroy an IDA with a single entry at @base */
 57static void ida_check_destroy_1(struct ida *ida, unsigned int base)
 58{
 59	IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) != base);
 60	IDA_BUG_ON(ida, ida_is_empty(ida));
 61	ida_destroy(ida);
 62	IDA_BUG_ON(ida, !ida_is_empty(ida));
 63}
 64
 65/* Check that ida_destroy and ida_is_empty work */
 66static void ida_check_destroy(struct ida *ida)
 67{
 68	/* Destroy an already-empty IDA */
 69	IDA_BUG_ON(ida, !ida_is_empty(ida));
 70	ida_destroy(ida);
 71	IDA_BUG_ON(ida, !ida_is_empty(ida));
 72
 73	ida_check_destroy_1(ida, 0);
 74	ida_check_destroy_1(ida, 1);
 75	ida_check_destroy_1(ida, 1023);
 76	ida_check_destroy_1(ida, 1024);
 77	ida_check_destroy_1(ida, 12345678);
 78}
 79
 80/*
 81 * Check what happens when we fill a leaf and then delete it.  This may
 82 * discover mishandling of IDR_FREE.
 83 */
 84static void ida_check_leaf(struct ida *ida, unsigned int base)
 85{
 86	unsigned long i;
 87
 88	for (i = 0; i < IDA_BITMAP_BITS; i++) {
 89		IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) !=
 90				base + i);
 91	}
 92
 93	ida_destroy(ida);
 94	IDA_BUG_ON(ida, !ida_is_empty(ida));
 95
 96	IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != 0);
 97	IDA_BUG_ON(ida, ida_is_empty(ida));
 98	ida_free(ida, 0);
 99	IDA_BUG_ON(ida, !ida_is_empty(ida));
100}
101
102/*
103 * Check allocations up to and slightly above the maximum allowed (2^31-1) ID.
104 * Allocating up to 2^31-1 should succeed, and then allocating the next one
105 * should fail.
106 */
107static void ida_check_max(struct ida *ida)
108{
109	unsigned long i, j;
110
111	for (j = 1; j < 65537; j *= 2) {
112		unsigned long base = (1UL << 31) - j;
113		for (i = 0; i < j; i++) {
114			IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) !=
115					base + i);
116		}
117		IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) !=
118				-ENOSPC);
119		ida_destroy(ida);
120		IDA_BUG_ON(ida, !ida_is_empty(ida));
121	}
122}
123
124/*
125 * Check handling of conversions between exceptional entries and full bitmaps.
126 */
127static void ida_check_conv(struct ida *ida)
128{
129	unsigned long i;
130
131	for (i = 0; i < IDA_BITMAP_BITS * 2; i += IDA_BITMAP_BITS) {
132		IDA_BUG_ON(ida, ida_alloc_min(ida, i + 1, GFP_KERNEL) != i + 1);
133		IDA_BUG_ON(ida, ida_alloc_min(ida, i + BITS_PER_LONG,
134					GFP_KERNEL) != i + BITS_PER_LONG);
135		ida_free(ida, i + 1);
136		ida_free(ida, i + BITS_PER_LONG);
137		IDA_BUG_ON(ida, !ida_is_empty(ida));
138	}
139
140	for (i = 0; i < IDA_BITMAP_BITS * 2; i++)
141		IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != i);
142	for (i = IDA_BITMAP_BITS * 2; i > 0; i--)
143		ida_free(ida, i - 1);
144	IDA_BUG_ON(ida, !ida_is_empty(ida));
145
146	for (i = 0; i < IDA_BITMAP_BITS + BITS_PER_LONG - 4; i++)
147		IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != i);
148	for (i = IDA_BITMAP_BITS + BITS_PER_LONG - 4; i > 0; i--)
149		ida_free(ida, i - 1);
150	IDA_BUG_ON(ida, !ida_is_empty(ida));
151}
152
153static DEFINE_IDA(ida);
154
155static int ida_checks(void)
156{
157	IDA_BUG_ON(&ida, !ida_is_empty(&ida));
158	ida_check_alloc(&ida);
159	ida_check_destroy(&ida);
160	ida_check_leaf(&ida, 0);
161	ida_check_leaf(&ida, 1024);
162	ida_check_leaf(&ida, 1024 * 64);
163	ida_check_max(&ida);
164	ida_check_conv(&ida);
165
166	printk("IDA: %u of %u tests passed\n", tests_passed, tests_run);
167	return (tests_run != tests_passed) ? 0 : -EINVAL;
168}
169
170static void ida_exit(void)
171{
172}
173
174module_init(ida_checks);
175module_exit(ida_exit);
176MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
177MODULE_LICENSE("GPL");