From: Mark Brown broonie@kernel.org
[ Upstream commit 2f0dbb24f78a333433a2b875c0b76bf55c119cd4 ]
During the cache sync test we verify that values we expect to have been written only to the cache do not appear in the hardware. This works most of the time but since we randomly generate both the original and new values there is a low probability that these values may actually be the same. Wrap get_random_bytes() to ensure that the values are different, there are other tests which should have similar verification that we actually changed something.
While we're at it refactor the test to use three changed values rather than attempting to use one of them twice, that just complicates checking that our new values are actually new.
We use random generation to try to avoid data dependencies in the tests.
Reported-by: Guenter Roeck linux@roeck-us.net Reviewed-by: Guenter Roeck linux@roeck-us.net Tested-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Mark Brown broonie@kernel.org Link: https://msgid.link/r/20240211-regmap-kunit-random-change-v3-1-e387a9ea4468@k... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/base/regmap/regmap-kunit.c | 54 +++++++++++++++++++++--------- 1 file changed, 38 insertions(+), 16 deletions(-)
diff --git a/drivers/base/regmap/regmap-kunit.c b/drivers/base/regmap/regmap-kunit.c index e14cc03a17f6c..4c9e38ead5c56 100644 --- a/drivers/base/regmap/regmap-kunit.c +++ b/drivers/base/regmap/regmap-kunit.c @@ -9,6 +9,23 @@
#define BLOCK_TEST_SIZE 12
+static void get_changed_bytes(void *orig, void *new, size_t size) +{ + char *o = orig; + char *n = new; + int i; + + get_random_bytes(new, size); + + /* + * This could be nicer and more efficient but we shouldn't + * super care. + */ + for (i = 0; i < size; i++) + while (n[i] == o[i]) + get_random_bytes(&n[i], 1); +} + static const struct regmap_config test_regmap_config = { .max_register = BLOCK_TEST_SIZE, .reg_stride = 1, @@ -1192,7 +1209,7 @@ static void raw_sync(struct kunit *test) struct regmap *map; struct regmap_config config; struct regmap_ram_data *data; - u16 val[2]; + u16 val[3]; u16 *hw_buf; unsigned int rval; int i; @@ -1206,17 +1223,13 @@ static void raw_sync(struct kunit *test)
hw_buf = (u16 *)data->vals;
- get_random_bytes(&val, sizeof(val)); + get_changed_bytes(&hw_buf[2], &val[0], sizeof(val));
/* Do a regular write and a raw write in cache only mode */ regcache_cache_only(map, true); - KUNIT_EXPECT_EQ(test, 0, regmap_raw_write(map, 2, val, sizeof(val))); - if (config.val_format_endian == REGMAP_ENDIAN_BIG) - KUNIT_EXPECT_EQ(test, 0, regmap_write(map, 6, - be16_to_cpu(val[0]))); - else - KUNIT_EXPECT_EQ(test, 0, regmap_write(map, 6, - le16_to_cpu(val[0]))); + KUNIT_EXPECT_EQ(test, 0, regmap_raw_write(map, 2, val, + sizeof(u16) * 2)); + KUNIT_EXPECT_EQ(test, 0, regmap_write(map, 4, val[2]));
/* We should read back the new values, and defaults for the rest */ for (i = 0; i < config.max_register + 1; i++) { @@ -1225,24 +1238,34 @@ static void raw_sync(struct kunit *test) switch (i) { case 2: case 3: - case 6: if (config.val_format_endian == REGMAP_ENDIAN_BIG) { KUNIT_EXPECT_EQ(test, rval, - be16_to_cpu(val[i % 2])); + be16_to_cpu(val[i - 2])); } else { KUNIT_EXPECT_EQ(test, rval, - le16_to_cpu(val[i % 2])); + le16_to_cpu(val[i - 2])); } break; + case 4: + KUNIT_EXPECT_EQ(test, rval, val[i - 2]); + break; default: KUNIT_EXPECT_EQ(test, config.reg_defaults[i].def, rval); break; } } + + /* + * The value written via _write() was translated by the core, + * translate the original copy for comparison purposes. + */ + if (config.val_format_endian == REGMAP_ENDIAN_BIG) + val[2] = cpu_to_be16(val[2]); + else + val[2] = cpu_to_le16(val[2]); /* The values should not appear in the "hardware" */ - KUNIT_EXPECT_MEMNEQ(test, &hw_buf[2], val, sizeof(val)); - KUNIT_EXPECT_MEMNEQ(test, &hw_buf[6], val, sizeof(u16)); + KUNIT_EXPECT_MEMNEQ(test, &hw_buf[2], &val[0], sizeof(val));
for (i = 0; i < config.max_register + 1; i++) data->written[i] = false; @@ -1253,8 +1276,7 @@ static void raw_sync(struct kunit *test) KUNIT_EXPECT_EQ(test, 0, regcache_sync(map));
/* The values should now appear in the "hardware" */ - KUNIT_EXPECT_MEMEQ(test, &hw_buf[2], val, sizeof(val)); - KUNIT_EXPECT_MEMEQ(test, &hw_buf[6], val, sizeof(u16)); + KUNIT_EXPECT_MEMEQ(test, &hw_buf[2], &val[0], sizeof(val));
regmap_exit(map); }