By default regmap uses a mutex to protect the regmap but we also support
other kinds of locking, including spinlocks, which can have an impact
especially around allocations. Ensure that we are covering the spinlock
case by running tests configured using fast I/O, this causes the core to
use a spinlock instead of a mutex. Running every single test would be
redundant but cover most of them.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/base/regmap/regmap-kunit.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap-kunit.c b/drivers/base/regmap/regmap-kunit.c
index b80b447c87a2..4bf3f1e59ed7 100644
--- a/drivers/base/regmap/regmap-kunit.c
+++ b/drivers/base/regmap/regmap-kunit.c
@@ -22,6 +22,7 @@ struct regmap_test_param {
 	enum regmap_endian val_endian;
 
 	unsigned int from_reg;
+	bool fast_io;
 };
 
 static void get_changed_bytes(void *orig, void *new, size_t size)
@@ -80,41 +81,52 @@ static const char *regmap_endian_name(enum regmap_endian endian)
 
 static void param_to_desc(const struct regmap_test_param *param, char *desc)
 {
-	snprintf(desc, KUNIT_PARAM_DESC_SIZE, "%s-%s @%#x",
+	snprintf(desc, KUNIT_PARAM_DESC_SIZE, "%s-%s%s @%#x",
 		 regcache_type_name(param->cache),
 		 regmap_endian_name(param->val_endian),
+		 param->fast_io ? " fast I/O" : "",
 		 param->from_reg);
 }
 
 static const struct regmap_test_param regcache_types_list[] = {
 	{ .cache = REGCACHE_NONE },
+	{ .cache = REGCACHE_NONE, .fast_io = true },
 	{ .cache = REGCACHE_FLAT },
+	{ .cache = REGCACHE_FLAT, .fast_io = true },
 	{ .cache = REGCACHE_RBTREE },
+	{ .cache = REGCACHE_RBTREE, .fast_io = true },
 	{ .cache = REGCACHE_MAPLE },
+	{ .cache = REGCACHE_MAPLE, .fast_io = true },
 };
 
 KUNIT_ARRAY_PARAM(regcache_types, regcache_types_list, param_to_desc);
 
 static const struct regmap_test_param real_cache_types_only_list[] = {
 	{ .cache = REGCACHE_FLAT },
+	{ .cache = REGCACHE_FLAT, .fast_io = true },
 	{ .cache = REGCACHE_RBTREE },
+	{ .cache = REGCACHE_RBTREE, .fast_io = true },
 	{ .cache = REGCACHE_MAPLE },
+	{ .cache = REGCACHE_MAPLE, .fast_io = true },
 };
 
 KUNIT_ARRAY_PARAM(real_cache_types_only, real_cache_types_only_list, param_to_desc);
 
 static const struct regmap_test_param real_cache_types_list[] = {
 	{ .cache = REGCACHE_FLAT,   .from_reg = 0 },
+	{ .cache = REGCACHE_FLAT,   .from_reg = 0, .fast_io = true },
 	{ .cache = REGCACHE_FLAT,   .from_reg = 0x2001 },
 	{ .cache = REGCACHE_FLAT,   .from_reg = 0x2002 },
 	{ .cache = REGCACHE_FLAT,   .from_reg = 0x2003 },
 	{ .cache = REGCACHE_FLAT,   .from_reg = 0x2004 },
 	{ .cache = REGCACHE_RBTREE, .from_reg = 0 },
+	{ .cache = REGCACHE_RBTREE, .from_reg = 0, .fast_io = true },
 	{ .cache = REGCACHE_RBTREE, .from_reg = 0x2001 },
 	{ .cache = REGCACHE_RBTREE, .from_reg = 0x2002 },
 	{ .cache = REGCACHE_RBTREE, .from_reg = 0x2003 },
 	{ .cache = REGCACHE_RBTREE, .from_reg = 0x2004 },
 	{ .cache = REGCACHE_MAPLE,  .from_reg = 0 },
+	{ .cache = REGCACHE_RBTREE, .from_reg = 0, .fast_io = true },
 	{ .cache = REGCACHE_MAPLE,  .from_reg = 0x2001 },
 	{ .cache = REGCACHE_MAPLE,  .from_reg = 0x2002 },
 	{ .cache = REGCACHE_MAPLE,  .from_reg = 0x2003 },
@@ -125,11 +137,13 @@ KUNIT_ARRAY_PARAM(real_cache_types, real_cache_types_list, param_to_desc);
 
 static const struct regmap_test_param sparse_cache_types_list[] = {
 	{ .cache = REGCACHE_RBTREE, .from_reg = 0 },
+	{ .cache = REGCACHE_RBTREE, .from_reg = 0, .fast_io = true },
 	{ .cache = REGCACHE_RBTREE, .from_reg = 0x2001 },
 	{ .cache = REGCACHE_RBTREE, .from_reg = 0x2002 },
 	{ .cache = REGCACHE_RBTREE, .from_reg = 0x2003 },
 	{ .cache = REGCACHE_RBTREE, .from_reg = 0x2004 },
 	{ .cache = REGCACHE_MAPLE,  .from_reg = 0 },
+	{ .cache = REGCACHE_MAPLE,  .from_reg = 0, .fast_io = true },
 	{ .cache = REGCACHE_MAPLE,  .from_reg = 0x2001 },
 	{ .cache = REGCACHE_MAPLE,  .from_reg = 0x2002 },
 	{ .cache = REGCACHE_MAPLE,  .from_reg = 0x2003 },
@@ -151,6 +165,7 @@ static struct regmap *gen_regmap(struct kunit *test,
 	struct reg_default *defaults;
 
 	config->cache_type = param->cache;
+	config->fast_io = param->fast_io;
 
 	if (config->max_register == 0) {
 		config->max_register = param->from_reg;

---
base-commit: ae0acef3822ed8908e83cd24f337891e6be64eba
change-id: 20240831-regmap-test-fast-io-b3f9d78aec42

Best regards,
-- 
Mark Brown <broonie@kernel.org>

On Sun, 01 Sep 2024 12:06:14 +0100, Mark Brown wrote:
> By default regmap uses a mutex to protect the regmap but we also support
> other kinds of locking, including spinlocks, which can have an impact
> especially around allocations. Ensure that we are covering the spinlock
> case by running tests configured using fast I/O, this causes the core to
> use a spinlock instead of a mutex. Running every single test would be
> redundant but cover most of them.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git for-next

Thanks!

[1/1] regmap: kunit: Add coverage of spinlocked regmaps
      commit: c7edb7ac8472a57e0c56a3a95796db3af98b2383

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark