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Date: Mon, 8 Apr 2024 15:46:00 +0100
From: Richard Fitzgerald <rf@...nsource.cirrus.com>
To: <broonie@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
"Richard
Fitzgerald" <rf@...nsource.cirrus.com>
Subject: [PATCH 11/11] regmap: kunit: Add test cases for regmap_read_bypassed()
This adds test cases to prove that regmap_read_bypassed() reads
the hardware value while the regmap is in cache-only.
Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
This depends on pending commit ("regmap: Add regmap_read_bypassed()")
https://lore.kernel.org/linux-sound/20240408101803.43183-1-rf@opensource.cirrus.com/T/#m2b99b1e01872bfc3597e89dee57dcdd5dbaf1b55
---
drivers/base/regmap/regmap-kunit.c | 131 +++++++++++++++++++++++++++++
1 file changed, 131 insertions(+)
diff --git a/drivers/base/regmap/regmap-kunit.c b/drivers/base/regmap/regmap-kunit.c
index 6e469609c82c..44265dc2313d 100644
--- a/drivers/base/regmap/regmap-kunit.c
+++ b/drivers/base/regmap/regmap-kunit.c
@@ -295,6 +295,135 @@ static void bulk_read(struct kunit *test)
KUNIT_EXPECT_EQ(test, config.cache_type == REGCACHE_NONE, data->read[i]);
}
+static void read_bypassed(struct kunit *test)
+{
+ const struct regmap_test_param *param = test->param_value;
+ struct regmap *map;
+ struct regmap_config config;
+ struct regmap_ram_data *data;
+ unsigned int val[BLOCK_TEST_SIZE], rval;
+ int i;
+
+ config = test_regmap_config;
+
+ map = gen_regmap(test, &config, &data);
+ KUNIT_ASSERT_FALSE(test, IS_ERR(map));
+ if (IS_ERR(map))
+ return;
+
+ KUNIT_EXPECT_FALSE(test, map->cache_bypass);
+
+ get_random_bytes(&val, sizeof(val));
+
+ /* Write some test values */
+ KUNIT_EXPECT_EQ(test, 0, regmap_bulk_write(map, param->from_reg, val, ARRAY_SIZE(val)));
+
+ regcache_cache_only(map, true);
+
+ /*
+ * While in cache-only regmap_read_bypassed() should return the register
+ * value and leave the map in cache-only.
+ */
+ for (i = 0; i < ARRAY_SIZE(val); i++) {
+ /* Put inverted bits in rval to prove we really read the value */
+ rval = ~val[i];
+ KUNIT_EXPECT_EQ(test, 0, regmap_read(map, param->from_reg + i, &rval));
+ KUNIT_EXPECT_EQ(test, val[i], rval);
+
+ rval = ~val[i];
+ KUNIT_EXPECT_EQ(test, 0, regmap_read_bypassed(map, param->from_reg + i, &rval));
+ KUNIT_EXPECT_EQ(test, val[i], rval);
+ KUNIT_EXPECT_TRUE(test, map->cache_only);
+ KUNIT_EXPECT_FALSE(test, map->cache_bypass);
+ }
+
+ /*
+ * Change the underlying register values to prove it is returning
+ * real values not cached values.
+ */
+ for (i = 0; i < ARRAY_SIZE(val); i++) {
+ val[i] = ~val[i];
+ data->vals[param->from_reg + i] = val[i];
+ }
+
+ for (i = 0; i < ARRAY_SIZE(val); i++) {
+ rval = ~val[i];
+ KUNIT_EXPECT_EQ(test, 0, regmap_read(map, param->from_reg + i, &rval));
+ KUNIT_EXPECT_NE(test, val[i], rval);
+
+ rval = ~val[i];
+ KUNIT_EXPECT_EQ(test, 0, regmap_read_bypassed(map, param->from_reg + i, &rval));
+ KUNIT_EXPECT_EQ(test, val[i], rval);
+ KUNIT_EXPECT_TRUE(test, map->cache_only);
+ KUNIT_EXPECT_FALSE(test, map->cache_bypass);
+ }
+}
+
+static void read_bypassed_volatile(struct kunit *test)
+{
+ const struct regmap_test_param *param = test->param_value;
+ struct regmap *map;
+ struct regmap_config config;
+ struct regmap_ram_data *data;
+ unsigned int val[BLOCK_TEST_SIZE], rval;
+ int i;
+
+ config = test_regmap_config;
+ /* All registers except #5 volatile */
+ config.volatile_reg = reg_5_false;
+
+ map = gen_regmap(test, &config, &data);
+ KUNIT_ASSERT_FALSE(test, IS_ERR(map));
+ if (IS_ERR(map))
+ return;
+
+ KUNIT_EXPECT_FALSE(test, map->cache_bypass);
+
+ get_random_bytes(&val, sizeof(val));
+
+ /* Write some test values */
+ KUNIT_EXPECT_EQ(test, 0, regmap_bulk_write(map, param->from_reg, val, ARRAY_SIZE(val)));
+
+ regcache_cache_only(map, true);
+
+ /*
+ * While in cache-only regmap_read_bypassed() should return the register
+ * value and leave the map in cache-only.
+ */
+ for (i = 0; i < ARRAY_SIZE(val); i++) {
+ /* Register #5 is non-volatile so should read from cache */
+ KUNIT_EXPECT_EQ(test, (i == 5) ? 0 : -EBUSY,
+ regmap_read(map, param->from_reg + i, &rval));
+
+ /* Put inverted bits in rval to prove we really read the value */
+ rval = ~val[i];
+ KUNIT_EXPECT_EQ(test, 0, regmap_read_bypassed(map, param->from_reg + i, &rval));
+ KUNIT_EXPECT_EQ(test, val[i], rval);
+ KUNIT_EXPECT_TRUE(test, map->cache_only);
+ KUNIT_EXPECT_FALSE(test, map->cache_bypass);
+ }
+
+ /*
+ * Change the underlying register values to prove it is returning
+ * real values not cached values.
+ */
+ for (i = 0; i < ARRAY_SIZE(val); i++) {
+ val[i] = ~val[i];
+ data->vals[param->from_reg + i] = val[i];
+ }
+
+ for (i = 0; i < ARRAY_SIZE(val); i++) {
+ if (i == 5)
+ continue;
+
+ rval = ~val[i];
+ KUNIT_EXPECT_EQ(test, 0, regmap_read_bypassed(map, param->from_reg + i, &rval));
+ KUNIT_EXPECT_EQ(test, val[i], rval);
+ KUNIT_EXPECT_TRUE(test, map->cache_only);
+ KUNIT_EXPECT_FALSE(test, map->cache_bypass);
+ }
+}
+
static void write_readonly(struct kunit *test)
{
struct regmap *map;
@@ -1747,6 +1876,8 @@ static void raw_ranges(struct kunit *test)
static struct kunit_case regmap_test_cases[] = {
KUNIT_CASE_PARAM(basic_read_write, regcache_types_gen_params),
+ KUNIT_CASE_PARAM(read_bypassed, real_cache_types_gen_params),
+ KUNIT_CASE_PARAM(read_bypassed_volatile, real_cache_types_gen_params),
KUNIT_CASE_PARAM(bulk_write, regcache_types_gen_params),
KUNIT_CASE_PARAM(bulk_read, regcache_types_gen_params),
KUNIT_CASE_PARAM(write_readonly, regcache_types_gen_params),
--
2.39.2
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