drivers/base/regmap/regmap-kunit.c

// SPDX-License-Identifier: GPL-2.0
//
// regmap KUnit tests
//
// Copyright 2023 Arm Ltd

#include <kunit/test.h>
#include "internal.h"

#define BLOCK_TEST_SIZE 12

static const struct regmap_config test_regmap_config = {
	.max_register = BLOCK_TEST_SIZE,
	.reg_stride = 1,
	.val_bits = sizeof(unsigned int) * 8,
};

struct regcache_types {
	enum regcache_type type;
	const char *name;
};

static void case_to_desc(const struct regcache_types *t, char *desc)
{
	strcpy(desc, t->name);
}

static const struct regcache_types regcache_types_list[] = {
	{ REGCACHE_NONE, "none" },
	{ REGCACHE_FLAT, "flat" },
	{ REGCACHE_RBTREE, "rbtree" },
	{ REGCACHE_MAPLE, "maple" },
};

KUNIT_ARRAY_PARAM(regcache_types, regcache_types_list, case_to_desc);

static const struct regcache_types real_cache_types_list[] = {
	{ REGCACHE_FLAT, "flat" },
	{ REGCACHE_RBTREE, "rbtree" },
	{ REGCACHE_MAPLE, "maple" },
};

KUNIT_ARRAY_PARAM(real_cache_types, real_cache_types_list, case_to_desc);

static const struct regcache_types sparse_cache_types_list[] = {
	{ REGCACHE_RBTREE, "rbtree" },
	{ REGCACHE_MAPLE, "maple" },
};

KUNIT_ARRAY_PARAM(sparse_cache_types, sparse_cache_types_list, case_to_desc);

static struct regmap *gen_regmap(struct regmap_config *config,
				 struct regmap_ram_data **data)
{
	unsigned int *buf;
	struct regmap *ret;
	size_t size = (config->max_register + 1) * sizeof(unsigned int);
	int i;
	struct reg_default *defaults;

	buf = kmalloc(size, GFP_KERNEL);
	if (!buf)
		return ERR_PTR(-ENOMEM);

	get_random_bytes(buf, size);

	*data = kzalloc(sizeof(**data), GFP_KERNEL);
	if (!(*data))
		return ERR_PTR(-ENOMEM);
	(*data)->vals = buf;

	if (config->num_reg_defaults) {
		defaults = kcalloc(config->num_reg_defaults,
				   sizeof(struct reg_default),
				   GFP_KERNEL);
		if (!defaults)
			return ERR_PTR(-ENOMEM);
		config->reg_defaults = defaults;

		for (i = 0; i < config->num_reg_defaults; i++) {
			defaults[i].reg = i * config->reg_stride;
			defaults[i].def = buf[i * config->reg_stride];
		}
	}

	ret = regmap_init_ram(config, *data);
	if (IS_ERR(ret)) {
		kfree(buf);
		kfree(*data);
	}

	return ret;
}

static void basic_read_write(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int val, rval;

	config = test_regmap_config;
	config.cache_type = t->type;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	get_random_bytes(&val, sizeof(val));

	/* If we write a value to a register we can read it back */
	KUNIT_EXPECT_EQ(test, 0, regmap_write(map, 0, val));
	KUNIT_EXPECT_EQ(test, 0, regmap_read(map, 0, &rval));
	KUNIT_EXPECT_EQ(test, val, rval);

	/* If using a cache the cache satisfied the read */
	KUNIT_EXPECT_EQ(test, t->type == REGCACHE_NONE, data->read[0]);

	regmap_exit(map);
}

static void bulk_write(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int val[BLOCK_TEST_SIZE], rval[BLOCK_TEST_SIZE];
	int i;

	config = test_regmap_config;
	config.cache_type = t->type;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	get_random_bytes(&val, sizeof(val));

	/*
	 * Data written via the bulk API can be read back with single
	 * reads.
	 */
	KUNIT_EXPECT_EQ(test, 0, regmap_bulk_write(map, 0, val,
						   BLOCK_TEST_SIZE));
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		KUNIT_EXPECT_EQ(test, 0, regmap_read(map, i, &rval[i]));

	KUNIT_EXPECT_MEMEQ(test, val, rval, sizeof(val));

	/* If using a cache the cache satisfied the read */
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		KUNIT_EXPECT_EQ(test, t->type == REGCACHE_NONE, data->read[i]);

	regmap_exit(map);
}

static void bulk_read(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int val[BLOCK_TEST_SIZE], rval[BLOCK_TEST_SIZE];
	int i;

	config = test_regmap_config;
	config.cache_type = t->type;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	get_random_bytes(&val, sizeof(val));

	/* Data written as single writes can be read via the bulk API */
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		KUNIT_EXPECT_EQ(test, 0, regmap_write(map, i, val[i]));
	KUNIT_EXPECT_EQ(test, 0, regmap_bulk_read(map, 0, rval,
						  BLOCK_TEST_SIZE));
	KUNIT_EXPECT_MEMEQ(test, val, rval, sizeof(val));

	/* If using a cache the cache satisfied the read */
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		KUNIT_EXPECT_EQ(test, t->type == REGCACHE_NONE, data->read[i]);

	regmap_exit(map);
}

static void reg_defaults(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int rval[BLOCK_TEST_SIZE];
	int i;

	config = test_regmap_config;
	config.cache_type = t->type;
	config.num_reg_defaults = BLOCK_TEST_SIZE;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	/* Read back the expected default data */
	KUNIT_EXPECT_EQ(test, 0, regmap_bulk_read(map, 0, rval,
						  BLOCK_TEST_SIZE));
	KUNIT_EXPECT_MEMEQ(test, data->vals, rval, sizeof(rval));

	/* The data should have been read from cache if there was one */
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		KUNIT_EXPECT_EQ(test, t->type == REGCACHE_NONE, data->read[i]);
}

static void reg_defaults_read_dev(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int rval[BLOCK_TEST_SIZE];
	int i;

	config = test_regmap_config;
	config.cache_type = t->type;
	config.num_reg_defaults_raw = BLOCK_TEST_SIZE;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	/* We should have read the cache defaults back from the map */
	for (i = 0; i < BLOCK_TEST_SIZE; i++) {
		KUNIT_EXPECT_EQ(test, t->type != REGCACHE_NONE, data->read[i]);
		data->read[i] = false;
	}

	/* Read back the expected default data */
	KUNIT_EXPECT_EQ(test, 0, regmap_bulk_read(map, 0, rval,
						  BLOCK_TEST_SIZE));
	KUNIT_EXPECT_MEMEQ(test, data->vals, rval, sizeof(rval));

	/* The data should have been read from cache if there was one */
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		KUNIT_EXPECT_EQ(test, t->type == REGCACHE_NONE, data->read[i]);
}

static void register_patch(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	struct reg_sequence patch[2];
	unsigned int rval[BLOCK_TEST_SIZE];
	int i;

	/* We need defaults so readback works */
	config = test_regmap_config;
	config.cache_type = t->type;
	config.num_reg_defaults = BLOCK_TEST_SIZE;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	/* Stash the original values */
	KUNIT_EXPECT_EQ(test, 0, regmap_bulk_read(map, 0, rval,
						  BLOCK_TEST_SIZE));

	/* Patch a couple of values */
	patch[0].reg = 2;
	patch[0].def = rval[2] + 1;
	patch[0].delay_us = 0;
	patch[1].reg = 5;
	patch[1].def = rval[5] + 1;
	patch[1].delay_us = 0;
	KUNIT_EXPECT_EQ(test, 0, regmap_register_patch(map, patch,
						       ARRAY_SIZE(patch)));

	/* Only the patched registers are written */
	for (i = 0; i < BLOCK_TEST_SIZE; i++) {
		switch (i) {
		case 2:
		case 5:
			KUNIT_EXPECT_TRUE(test, data->written[i]);
			KUNIT_EXPECT_EQ(test, data->vals[i], rval[i] + 1);
			break;
		default:
			KUNIT_EXPECT_FALSE(test, data->written[i]);
			KUNIT_EXPECT_EQ(test, data->vals[i], rval[i]);
			break;
		}
	}

	regmap_exit(map);
}

static void stride(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int rval;
	int i;

	config = test_regmap_config;
	config.cache_type = t->type;
	config.reg_stride = 2;
	config.num_reg_defaults = BLOCK_TEST_SIZE / 2;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	/* Only even registers can be accessed, try both read and write */
	for (i = 0; i < BLOCK_TEST_SIZE; i++) {
		data->read[i] = false;
		data->written[i] = false;

		if (i % 2) {
			KUNIT_EXPECT_NE(test, 0, regmap_read(map, i, &rval));
			KUNIT_EXPECT_NE(test, 0, regmap_write(map, i, rval));
			KUNIT_EXPECT_FALSE(test, data->read[i]);
			KUNIT_EXPECT_FALSE(test, data->written[i]);
		} else {
			KUNIT_EXPECT_EQ(test, 0, regmap_read(map, i, &rval));
			KUNIT_EXPECT_EQ(test, data->vals[i], rval);
			KUNIT_EXPECT_EQ(test, t->type == REGCACHE_NONE,
					data->read[i]);

			KUNIT_EXPECT_EQ(test, 0, regmap_write(map, i, rval));
			KUNIT_EXPECT_TRUE(test, data->written[i]);
		}
	}

	regmap_exit(map);
}

static struct regmap_range_cfg test_range = {
	.selector_reg = 1,
	.selector_mask = 0xff,

	.window_start = 4,
	.window_len = 10,

	.range_min = 20,
	.range_max = 40,
};

static bool test_range_volatile(struct device *dev, unsigned int reg)
{
	if (reg >= test_range.window_start &&
	    reg <= test_range.selector_reg + test_range.window_len)
		return true;

	if (reg >= test_range.range_min && reg <= test_range.range_max)
		return true;

	return false;
}

static void basic_ranges(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int val;
	int i;

	config = test_regmap_config;
	config.cache_type = t->type;
	config.volatile_reg = test_range_volatile;
	config.ranges = &test_range;
	config.num_ranges = 1;
	config.max_register = test_range.range_max;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	for (i = test_range.range_min; i < test_range.range_max; i++) {
		data->read[i] = false;
		data->written[i] = false;
	}

	/* Reset the page to a non-zero value to trigger a change */
	KUNIT_EXPECT_EQ(test, 0, regmap_write(map, test_range.selector_reg,
					      test_range.range_max));

	/* Check we set the page and use the window for writes */
	data->written[test_range.selector_reg] = false;
	data->written[test_range.window_start] = false;
	KUNIT_EXPECT_EQ(test, 0, regmap_write(map, test_range.range_min, 0));
	KUNIT_EXPECT_TRUE(test, data->written[test_range.selector_reg]);
	KUNIT_EXPECT_TRUE(test, data->written[test_range.window_start]);

	data->written[test_range.selector_reg] = false;
	data->written[test_range.window_start] = false;
	KUNIT_EXPECT_EQ(test, 0, regmap_write(map,
					      test_range.range_min +
					      test_range.window_len,
					      0));
	KUNIT_EXPECT_TRUE(test, data->written[test_range.selector_reg]);
	KUNIT_EXPECT_TRUE(test, data->written[test_range.window_start]);

	/* Same for reads */
	data->written[test_range.selector_reg] = false;
	data->read[test_range.window_start] = false;
	KUNIT_EXPECT_EQ(test, 0, regmap_read(map, test_range.range_min, &val));
	KUNIT_EXPECT_TRUE(test, data->written[test_range.selector_reg]);
	KUNIT_EXPECT_TRUE(test, data->read[test_range.window_start]);

	data->written[test_range.selector_reg] = false;
	data->read[test_range.window_start] = false;
	KUNIT_EXPECT_EQ(test, 0, regmap_read(map,
					     test_range.range_min +
					     test_range.window_len,
					     &val));
	KUNIT_EXPECT_TRUE(test, data->written[test_range.selector_reg]);
	KUNIT_EXPECT_TRUE(test, data->read[test_range.window_start]);

	/* No physical access triggered in the virtual range */
	for (i = test_range.range_min; i < test_range.range_max; i++) {
		KUNIT_EXPECT_FALSE(test, data->read[i]);
		KUNIT_EXPECT_FALSE(test, data->written[i]);
	}

	regmap_exit(map);
}

/* Try to stress dynamic creation of cache data structures */
static void stress_insert(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int rval, *vals;
	size_t buf_sz;
	int i;

	config = test_regmap_config;
	config.cache_type = t->type;
	config.max_register = 300;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	vals = kunit_kcalloc(test, sizeof(unsigned long), config.max_register,
			     GFP_KERNEL);
	KUNIT_ASSERT_FALSE(test, vals == NULL);
	buf_sz = sizeof(unsigned long) * config.max_register;

	get_random_bytes(vals, buf_sz);

	/* Write data into the map/cache in ever decreasing strides */
	for (i = 0; i < config.max_register; i += 100)
		KUNIT_EXPECT_EQ(test, 0, regmap_write(map, i, vals[i]));
	for (i = 0; i < config.max_register; i += 50)
		KUNIT_EXPECT_EQ(test, 0, regmap_write(map, i, vals[i]));
	for (i = 0; i < config.max_register; i += 25)
		KUNIT_EXPECT_EQ(test, 0, regmap_write(map, i, vals[i]));
	for (i = 0; i < config.max_register; i += 10)
		KUNIT_EXPECT_EQ(test, 0, regmap_write(map, i, vals[i]));
	for (i = 0; i < config.max_register; i += 5)
		KUNIT_EXPECT_EQ(test, 0, regmap_write(map, i, vals[i]));
	for (i = 0; i < config.max_register; i += 3)
		KUNIT_EXPECT_EQ(test, 0, regmap_write(map, i, vals[i]));
	for (i = 0; i < config.max_register; i += 2)
		KUNIT_EXPECT_EQ(test, 0, regmap_write(map, i, vals[i]));
	for (i = 0; i < config.max_register; i++)
		KUNIT_EXPECT_EQ(test, 0, regmap_write(map, i, vals[i]));

	/* Do reads from the cache (if there is one) match? */
	for (i = 0; i < config.max_register; i ++) {
		KUNIT_EXPECT_EQ(test, 0, regmap_read(map, i, &rval));
		KUNIT_EXPECT_EQ(test, rval, vals[i]);
		KUNIT_EXPECT_EQ(test, t->type == REGCACHE_NONE, data->read[i]);
	}

	regmap_exit(map);
}

static void cache_bypass(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int val, rval;

	config = test_regmap_config;
	config.cache_type = t->type;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	get_random_bytes(&val, sizeof(val));

	/* Ensure the cache has a value in it */
	KUNIT_EXPECT_EQ(test, 0, regmap_write(map, 0, val));

	/* Bypass then write a different value */
	regcache_cache_bypass(map, true);
	KUNIT_EXPECT_EQ(test, 0, regmap_write(map, 0, val + 1));

	/* Read the bypassed value */
	KUNIT_EXPECT_EQ(test, 0, regmap_read(map, 0, &rval));
	KUNIT_EXPECT_EQ(test, val + 1, rval);
	KUNIT_EXPECT_EQ(test, data->vals[0], rval);

	/* Disable bypass, the cache should still return the original value */
	regcache_cache_bypass(map, false);
	KUNIT_EXPECT_EQ(test, 0, regmap_read(map, 0, &rval));
	KUNIT_EXPECT_EQ(test, val, rval);

	regmap_exit(map);
}

static void cache_sync(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int val[BLOCK_TEST_SIZE];
	int i;

	config = test_regmap_config;
	config.cache_type = t->type;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	get_random_bytes(&val, sizeof(val));

	/* Put some data into the cache */
	KUNIT_EXPECT_EQ(test, 0, regmap_bulk_write(map, 0, val,
						   BLOCK_TEST_SIZE));
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		data->written[i] = false;

	/* Trash the data on the device itself then resync */
	regcache_mark_dirty(map);
	memset(data->vals, 0, sizeof(val));
	KUNIT_EXPECT_EQ(test, 0, regcache_sync(map));

	/* Did we just write the correct data out? */
	KUNIT_EXPECT_MEMEQ(test, data->vals, val, sizeof(val));
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		KUNIT_EXPECT_EQ(test, true, data->written[i]);

	regmap_exit(map);
}

static void cache_sync_defaults(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int val;
	int i;

	config = test_regmap_config;
	config.cache_type = t->type;
	config.num_reg_defaults = BLOCK_TEST_SIZE;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	get_random_bytes(&val, sizeof(val));

	/* Change the value of one register */
	KUNIT_EXPECT_EQ(test, 0, regmap_write(map, 2, val));

	/* Resync */
	regcache_mark_dirty(map);
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		data->written[i] = false;
	KUNIT_EXPECT_EQ(test, 0, regcache_sync(map));

	/* Did we just sync the one register we touched? */
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		KUNIT_EXPECT_EQ(test, i == 2, data->written[i]);

	regmap_exit(map);
}

static void cache_sync_patch(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	struct reg_sequence patch[2];
	unsigned int rval[BLOCK_TEST_SIZE], val;
	int i;

	/* We need defaults so readback works */
	config = test_regmap_config;
	config.cache_type = t->type;
	config.num_reg_defaults = BLOCK_TEST_SIZE;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	/* Stash the original values */
	KUNIT_EXPECT_EQ(test, 0, regmap_bulk_read(map, 0, rval,
						  BLOCK_TEST_SIZE));

	/* Patch a couple of values */
	patch[0].reg = 2;
	patch[0].def = rval[2] + 1;
	patch[0].delay_us = 0;
	patch[1].reg = 5;
	patch[1].def = rval[5] + 1;
	patch[1].delay_us = 0;
	KUNIT_EXPECT_EQ(test, 0, regmap_register_patch(map, patch,
						       ARRAY_SIZE(patch)));

	/* Sync the cache */
	regcache_mark_dirty(map);
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		data->written[i] = false;
	KUNIT_EXPECT_EQ(test, 0, regcache_sync(map));

	/* The patch should be on the device but not in the cache */
	for (i = 0; i < BLOCK_TEST_SIZE; i++) {
		KUNIT_EXPECT_EQ(test, 0, regmap_read(map, i, &val));
		KUNIT_EXPECT_EQ(test, val, rval[i]);

		switch (i) {
		case 2:
		case 5:
			KUNIT_EXPECT_EQ(test, true, data->written[i]);
			KUNIT_EXPECT_EQ(test, data->vals[i], rval[i] + 1);
			break;
		default:
			KUNIT_EXPECT_EQ(test, false, data->written[i]);
			KUNIT_EXPECT_EQ(test, data->vals[i], rval[i]);
			break;
		}
	}

	regmap_exit(map);
}

static void cache_drop(struct kunit *test)
{
	struct regcache_types *t = (struct regcache_types *)test->param_value;
	struct regmap *map;
	struct regmap_config config;
	struct regmap_ram_data *data;
	unsigned int rval[BLOCK_TEST_SIZE];
	int i;

	config = test_regmap_config;
	config.cache_type = t->type;
	config.num_reg_defaults = BLOCK_TEST_SIZE;

	map = gen_regmap(&config, &data);
	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
	if (IS_ERR(map))
		return;

	/* Ensure the data is read from the cache */
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		data->read[i] = false;
	KUNIT_EXPECT_EQ(test, 0, regmap_bulk_read(map, 0, rval,
						  BLOCK_TEST_SIZE));
	for (i = 0; i < BLOCK_TEST_SIZE; i++) {
		KUNIT_EXPECT_FALSE(test, data->read[i]);
		data->read[i] = false;
	}
	KUNIT_EXPECT_MEMEQ(test, data->vals, rval, sizeof(rval));

	/* Drop some registers */
	KUNIT_EXPECT_EQ(test, 0, regcache_drop_region(map, 3, 5));

	/* Reread and check only the dropped registers hit the device. */
	KUNIT_EXPECT_EQ(test, 0, regmap_bulk_read(map, 0, rval,
						  BLOCK_TEST_SIZE));
	for (i = 0; i < BLOCK_TEST_SIZE; i++)
		KUNIT_EXPECT_EQ(test, data->read[i], i >= 3 && i <= 5);
	KUNIT_EXPECT_MEMEQ(test, data->vals, rval, sizeof(rval));

	regmap_exit(map);
}

static struct kunit_case regmap_test_cases[] = {
	KUNIT_CASE_PARAM(basic_read_write, regcache_types_gen_params),
	KUNIT_CASE_PARAM(bulk_write, regcache_types_gen_params),
	KUNIT_CASE_PARAM(bulk_read, regcache_types_gen_params),
	KUNIT_CASE_PARAM(reg_defaults, regcache_types_gen_params),
	KUNIT_CASE_PARAM(reg_defaults_read_dev, regcache_types_gen_params),
	KUNIT_CASE_PARAM(register_patch, regcache_types_gen_params),
	KUNIT_CASE_PARAM(stride, regcache_types_gen_params),
	KUNIT_CASE_PARAM(basic_ranges, regcache_types_gen_params),
	KUNIT_CASE_PARAM(stress_insert, regcache_types_gen_params),
	KUNIT_CASE_PARAM(cache_bypass, real_cache_types_gen_params),
	KUNIT_CASE_PARAM(cache_sync, real_cache_types_gen_params),
	KUNIT_CASE_PARAM(cache_sync_defaults, real_cache_types_gen_params),
	KUNIT_CASE_PARAM(cache_sync_patch, real_cache_types_gen_params),
	KUNIT_CASE_PARAM(cache_drop, sparse_cache_types_gen_params),
	{}
};

static struct kunit_suite regmap_test_suite = {
	.name = "regmap",
	.test_cases = regmap_test_cases,
};
kunit_test_suite(regmap_test_suite);

MODULE_LICENSE("GPL v2");