summaryrefslogtreecommitdiffstats
path: root/lib/test_bitmap.c
blob: aa1f2669bdd5d83663994ef04ca0d26b634e8e5f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
/*
 * Test cases for printf facility.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/bitmap.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/string.h>

static unsigned total_tests __initdata;
static unsigned failed_tests __initdata;

static char pbl_buffer[PAGE_SIZE] __initdata;


static bool __init
__check_eq_uint(const char *srcfile, unsigned int line,
		const unsigned int exp_uint, unsigned int x)
{
	if (exp_uint != x) {
		pr_warn("[%s:%u] expected %u, got %u\n",
			srcfile, line, exp_uint, x);
		return false;
	}
	return true;
}


static bool __init
__check_eq_bitmap(const char *srcfile, unsigned int line,
		  const unsigned long *exp_bmap, unsigned int exp_nbits,
		  const unsigned long *bmap, unsigned int nbits)
{
	if (exp_nbits != nbits) {
		pr_warn("[%s:%u] bitmap length mismatch: expected %u, got %u\n",
			srcfile, line, exp_nbits, nbits);
		return false;
	}

	if (!bitmap_equal(exp_bmap, bmap, nbits)) {
		pr_warn("[%s:%u] bitmaps contents differ: expected \"%*pbl\", got \"%*pbl\"\n",
			srcfile, line,
			exp_nbits, exp_bmap, nbits, bmap);
		return false;
	}
	return true;
}

static bool __init
__check_eq_pbl(const char *srcfile, unsigned int line,
	       const char *expected_pbl,
	       const unsigned long *bitmap, unsigned int nbits)
{
	snprintf(pbl_buffer, sizeof(pbl_buffer), "%*pbl", nbits, bitmap);
	if (strcmp(expected_pbl, pbl_buffer)) {
		pr_warn("[%s:%u] expected \"%s\", got \"%s\"\n",
			srcfile, line,
			expected_pbl, pbl_buffer);
		return false;
	}
	return true;
}

static bool __init
__check_eq_u32_array(const char *srcfile, unsigned int line,
		     const u32 *exp_arr, unsigned int exp_len,
		     const u32 *arr, unsigned int len)
{
	if (exp_len != len) {
		pr_warn("[%s:%u] array length differ: expected %u, got %u\n",
			srcfile, line,
			exp_len, len);
		return false;
	}

	if (memcmp(exp_arr, arr, len*sizeof(*arr))) {
		pr_warn("[%s:%u] array contents differ\n", srcfile, line);
		print_hex_dump(KERN_WARNING, "  exp:  ", DUMP_PREFIX_OFFSET,
			       32, 4, exp_arr, exp_len*sizeof(*exp_arr), false);
		print_hex_dump(KERN_WARNING, "  got:  ", DUMP_PREFIX_OFFSET,
			       32, 4, arr, len*sizeof(*arr), false);
		return false;
	}

	return true;
}

#define __expect_eq(suffix, ...)					\
	({								\
		int result = 0;						\
		total_tests++;						\
		if (!__check_eq_ ## suffix(__FILE__, __LINE__,		\
					   ##__VA_ARGS__)) {		\
			failed_tests++;					\
			result = 1;					\
		}							\
		result;							\
	})

#define expect_eq_uint(...)		__expect_eq(uint, ##__VA_ARGS__)
#define expect_eq_bitmap(...)		__expect_eq(bitmap, ##__VA_ARGS__)
#define expect_eq_pbl(...)		__expect_eq(pbl, ##__VA_ARGS__)
#define expect_eq_u32_array(...)	__expect_eq(u32_array, ##__VA_ARGS__)

static void __init test_zero_fill_copy(void)
{
	DECLARE_BITMAP(bmap1, 1024);
	DECLARE_BITMAP(bmap2, 1024);

	bitmap_zero(bmap1, 1024);
	bitmap_zero(bmap2, 1024);

	/* single-word bitmaps */
	expect_eq_pbl("", bmap1, 23);

	bitmap_fill(bmap1, 19);
	expect_eq_pbl("0-18", bmap1, 1024);

	bitmap_copy(bmap2, bmap1, 23);
	expect_eq_pbl("0-18", bmap2, 1024);

	bitmap_fill(bmap2, 23);
	expect_eq_pbl("0-22", bmap2, 1024);

	bitmap_copy(bmap2, bmap1, 23);
	expect_eq_pbl("0-18", bmap2, 1024);

	bitmap_zero(bmap1, 23);
	expect_eq_pbl("", bmap1, 1024);

	/* multi-word bitmaps */
	bitmap_zero(bmap1, 1024);
	expect_eq_pbl("", bmap1, 1024);

	bitmap_fill(bmap1, 109);
	expect_eq_pbl("0-108", bmap1, 1024);

	bitmap_copy(bmap2, bmap1, 1024);
	expect_eq_pbl("0-108", bmap2, 1024);

	bitmap_fill(bmap2, 1024);
	expect_eq_pbl("0-1023", bmap2, 1024);

	bitmap_copy(bmap2, bmap1, 1024);
	expect_eq_pbl("0-108", bmap2, 1024);

	/* the following tests assume a 32- or 64-bit arch (even 128b
	 * if we care)
	 */

	bitmap_fill(bmap2, 1024);
	bitmap_copy(bmap2, bmap1, 109);  /* ... but 0-padded til word length */
	expect_eq_pbl("0-108,128-1023", bmap2, 1024);

	bitmap_fill(bmap2, 1024);
	bitmap_copy(bmap2, bmap1, 97);  /* ... but aligned on word length */
	expect_eq_pbl("0-108,128-1023", bmap2, 1024);

	bitmap_zero(bmap2, 97);  /* ... but 0-padded til word length */
	expect_eq_pbl("128-1023", bmap2, 1024);
}

#define PARSE_TIME 0x1

struct test_bitmap_parselist{
	const int errno;
	const char *in;
	const unsigned long *expected;
	const int nbits;
	const int flags;
};

static const unsigned long exp[] __initconst = {
	BITMAP_FROM_U64(1),
	BITMAP_FROM_U64(2),
	BITMAP_FROM_U64(0x0000ffff),
	BITMAP_FROM_U64(0xffff0000),
	BITMAP_FROM_U64(0x55555555),
	BITMAP_FROM_U64(0xaaaaaaaa),
	BITMAP_FROM_U64(0x11111111),
	BITMAP_FROM_U64(0x22222222),
	BITMAP_FROM_U64(0xffffffff),
	BITMAP_FROM_U64(0xfffffffe),
	BITMAP_FROM_U64(0x3333333311111111ULL),
	BITMAP_FROM_U64(0xffffffff77777777ULL)
};

static const unsigned long exp2[] __initconst = {
	BITMAP_FROM_U64(0x3333333311111111ULL),
	BITMAP_FROM_U64(0xffffffff77777777ULL)
};

static const struct test_bitmap_parselist parselist_tests[] __initconst = {
#define step (sizeof(u64) / sizeof(unsigned long))

	{0, "0",			&exp[0], 8, 0},
	{0, "1",			&exp[1 * step], 8, 0},
	{0, "0-15",			&exp[2 * step], 32, 0},
	{0, "16-31",			&exp[3 * step], 32, 0},
	{0, "0-31:1/2",			&exp[4 * step], 32, 0},
	{0, "1-31:1/2",			&exp[5 * step], 32, 0},
	{0, "0-31:1/4",			&exp[6 * step], 32, 0},
	{0, "1-31:1/4",			&exp[7 * step], 32, 0},
	{0, "0-31:4/4",			&exp[8 * step], 32, 0},
	{0, "1-31:4/4",			&exp[9 * step], 32, 0},
	{0, "0-31:1/4,32-63:2/4",	&exp[10 * step], 64, 0},
	{0, "0-31:3/4,32-63:4/4",	&exp[11 * step], 64, 0},

	{0, "0-31:1/4,32-63:2/4,64-95:3/4,96-127:4/4",	exp2, 128, 0},

	{0, "0-2047:128/256", NULL, 2048, PARSE_TIME},

	{-EINVAL, "-1",	NULL, 8, 0},
	{-EINVAL, "-0",	NULL, 8, 0},
	{-EINVAL, "10-1", NULL, 8, 0},
	{-EINVAL, "0-31:10/1", NULL, 8, 0},
};

static void __init test_bitmap_parselist(void)
{
	int i;
	int err;
	cycles_t cycles;
	DECLARE_BITMAP(bmap, 2048);

	for (i = 0; i < ARRAY_SIZE(parselist_tests); i++) {
#define ptest parselist_tests[i]

		cycles = get_cycles();
		err = bitmap_parselist(ptest.in, bmap, ptest.nbits);
		cycles = get_cycles() - cycles;

		if (err != ptest.errno) {
			pr_err("test %d: input is %s, errno is %d, expected %d\n",
					i, ptest.in, err, ptest.errno);
			continue;
		}

		if (!err && ptest.expected
			 && !__bitmap_equal(bmap, ptest.expected, ptest.nbits)) {
			pr_err("test %d: input is %s, result is 0x%lx, expected 0x%lx\n",
					i, ptest.in, bmap[0], *ptest.expected);
			continue;
		}

		if (ptest.flags & PARSE_TIME)
			pr_err("test %d: input is '%s' OK, Time: %llu\n",
					i, ptest.in,
					(unsigned long long)cycles);
	}
}

static void __init test_bitmap_u32_array_conversions(void)
{
	DECLARE_BITMAP(bmap1, 1024);
	DECLARE_BITMAP(bmap2, 1024);
	u32 exp_arr[32], arr[32];
	unsigned nbits;

	for (nbits = 0 ; nbits < 257 ; ++nbits) {
		const unsigned int used_u32s = DIV_ROUND_UP(nbits, 32);
		unsigned int i, rv;

		bitmap_zero(bmap1, nbits);
		bitmap_set(bmap1, nbits, 1024 - nbits);  /* garbage */

		memset(arr, 0xff, sizeof(arr));
		rv = bitmap_to_u32array(arr, used_u32s, bmap1, nbits);
		expect_eq_uint(nbits, rv);

		memset(exp_arr, 0xff, sizeof(exp_arr));
		memset(exp_arr, 0, used_u32s*sizeof(*exp_arr));
		expect_eq_u32_array(exp_arr, 32, arr, 32);

		bitmap_fill(bmap2, 1024);
		rv = bitmap_from_u32array(bmap2, nbits, arr, used_u32s);
		expect_eq_uint(nbits, rv);
		expect_eq_bitmap(bmap1, 1024, bmap2, 1024);

		for (i = 0 ; i < nbits ; ++i) {
			/*
			 * test conversion bitmap -> u32[]
			 */

			bitmap_zero(bmap1, 1024);
			__set_bit(i, bmap1);
			bitmap_set(bmap1, nbits, 1024 - nbits);  /* garbage */

			memset(arr, 0xff, sizeof(arr));
			rv = bitmap_to_u32array(arr, used_u32s, bmap1, nbits);
			expect_eq_uint(nbits, rv);

			/* 1st used u32 words contain expected bit set, the
			 * remaining words are left unchanged (0xff)
			 */
			memset(exp_arr, 0xff, sizeof(exp_arr));
			memset(exp_arr, 0, used_u32s*sizeof(*exp_arr));
			exp_arr[i/32] = (1U<<(i%32));
			expect_eq_u32_array(exp_arr, 32, arr, 32);


			/* same, with longer array to fill
			 */
			memset(arr, 0xff, sizeof(arr));
			rv = bitmap_to_u32array(arr, 32, bmap1, nbits);
			expect_eq_uint(nbits, rv);

			/* 1st used u32 words contain expected bit set, the
			 * remaining words are all 0s
			 */
			memset(exp_arr, 0, sizeof(exp_arr));
			exp_arr[i/32] = (1U<<(i%32));
			expect_eq_u32_array(exp_arr, 32, arr, 32);

			/*
			 * test conversion u32[] -> bitmap
			 */

			/* the 1st nbits of bmap2 are identical to
			 * bmap1, the remaining bits of bmap2 are left
			 * unchanged (all 1s)
			 */
			bitmap_fill(bmap2, 1024);
			rv = bitmap_from_u32array(bmap2, nbits,
						  exp_arr, used_u32s);
			expect_eq_uint(nbits, rv);

			expect_eq_bitmap(bmap1, 1024, bmap2, 1024);

			/* same, with more bits to fill
			 */
			memset(arr, 0xff, sizeof(arr));  /* garbage */
			memset(arr, 0, used_u32s*sizeof(u32));
			arr[i/32] = (1U<<(i%32));

			bitmap_fill(bmap2, 1024);
			rv = bitmap_from_u32array(bmap2, 1024, arr, used_u32s);
			expect_eq_uint(used_u32s*32, rv);

			/* the 1st nbits of bmap2 are identical to
			 * bmap1, the remaining bits of bmap2 are cleared
			 */
			bitmap_zero(bmap1, 1024);
			__set_bit(i, bmap1);
			expect_eq_bitmap(bmap1, 1024, bmap2, 1024);


			/*
			 * test short conversion bitmap -> u32[] (1
			 * word too short)
			 */
			if (used_u32s > 1) {
				bitmap_zero(bmap1, 1024);
				__set_bit(i, bmap1);
				bitmap_set(bmap1, nbits,
					   1024 - nbits);  /* garbage */
				memset(arr, 0xff, sizeof(arr));

				rv = bitmap_to_u32array(arr, used_u32s - 1,
							bmap1, nbits);
				expect_eq_uint((used_u32s - 1)*32, rv);

				/* 1st used u32 words contain expected
				 * bit set, the remaining words are
				 * left unchanged (0xff)
				 */
				memset(exp_arr, 0xff, sizeof(exp_arr));
				memset(exp_arr, 0,
				       (used_u32s-1)*sizeof(*exp_arr));
				if ((i/32) < (used_u32s - 1))
					exp_arr[i/32] = (1U<<(i%32));
				expect_eq_u32_array(exp_arr, 32, arr, 32);
			}

			/*
			 * test short conversion u32[] -> bitmap (3
			 * bits too short)
			 */
			if (nbits > 3) {
				memset(arr, 0xff, sizeof(arr));  /* garbage */
				memset(arr, 0, used_u32s*sizeof(*arr));
				arr[i/32] = (1U<<(i%32));

				bitmap_zero(bmap1, 1024);
				rv = bitmap_from_u32array(bmap1, nbits - 3,
							  arr, used_u32s);
				expect_eq_uint(nbits - 3, rv);

				/* we are expecting the bit < nbits -
				 * 3 (none otherwise), and the rest of
				 * bmap1 unchanged (0-filled)
				 */
				bitmap_zero(bmap2, 1024);
				if (i < nbits - 3)
					__set_bit(i, bmap2);
				expect_eq_bitmap(bmap2, 1024, bmap1, 1024);

				/* do the same with bmap1 initially
				 * 1-filled
				 */

				bitmap_fill(bmap1, 1024);
				rv = bitmap_from_u32array(bmap1, nbits - 3,
							 arr, used_u32s);
				expect_eq_uint(nbits - 3, rv);

				/* we are expecting the bit < nbits -
				 * 3 (none otherwise), and the rest of
				 * bmap1 unchanged (1-filled)
				 */
				bitmap_zero(bmap2, 1024);
				if (i < nbits - 3)
					__set_bit(i, bmap2);
				bitmap_set(bmap2, nbits-3, 1024 - nbits + 3);
				expect_eq_bitmap(bmap2, 1024, bmap1, 1024);
			}
		}
	}
}

static void noinline __init test_mem_optimisations(void)
{
	DECLARE_BITMAP(bmap1, 1024);
	DECLARE_BITMAP(bmap2, 1024);
	unsigned int start, nbits;

	for (start = 0; start < 1024; start += 8) {
		memset(bmap1, 0x5a, sizeof(bmap1));
		memset(bmap2, 0x5a, sizeof(bmap2));
		for (nbits = 0; nbits < 1024 - start; nbits += 8) {
			bitmap_set(bmap1, start, nbits);
			__bitmap_set(bmap2, start, nbits);
			if (!bitmap_equal(bmap1, bmap2, 1024))
				printk("set not equal %d %d\n", start, nbits);
			if (!__bitmap_equal(bmap1, bmap2, 1024))
				printk("set not __equal %d %d\n", start, nbits);

			bitmap_clear(bmap1, start, nbits);
			__bitmap_clear(bmap2, start, nbits);
			if (!bitmap_equal(bmap1, bmap2, 1024))
				printk("clear not equal %d %d\n", start, nbits);
			if (!__bitmap_equal(bmap1, bmap2, 1024))
				printk("clear not __equal %d %d\n", start,
									nbits);
		}
	}
}

static int __init test_bitmap_init(void)
{
	test_zero_fill_copy();
	test_bitmap_u32_array_conversions();
	test_bitmap_parselist();
	test_mem_optimisations();

	if (failed_tests == 0)
		pr_info("all %u tests passed\n", total_tests);
	else
		pr_warn("failed %u out of %u tests\n",
			failed_tests, total_tests);

	return failed_tests ? -EINVAL : 0;
}

static void __exit test_bitmap_cleanup(void)
{
}

module_init(test_bitmap_init);
module_exit(test_bitmap_cleanup);

MODULE_AUTHOR("david decotigny <david.decotigny@googlers.com>");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud