clk: gate: Add some kunit test suites

Test various parts of the clk gate implementation with the kunit testing
framework.

Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Acked-by: Daniel Latypov <dlatypov@google.com>
Cc: <kunit-dev@googlegroups.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20220120175902.2165958-1-sboyd@kernel.org

diff --git a/drivers/clk/.kunitconfig b/drivers/clk/.kunitconfig
new file mode 100644 (file)
index 0000000..3754fdb
--- /dev/null
+++ b/drivers/clk/.kunitconfig
@@ -0,0 +1,3 @@
+CONFIG_KUNIT=y
+CONFIG_COMMON_CLK=y
+CONFIG_CLK_GATE_KUNIT_TEST=y

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index ad4256d543613e545ef4e4fa9518e70536f3ada1..3cdf33470a75006bde184e1214d358f01b67dba4 100644 (file)
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -428,4 +428,12 @@ source "drivers/clk/x86/Kconfig"
 source "drivers/clk/xilinx/Kconfig"
 source "drivers/clk/zynqmp/Kconfig"
 
+# Kunit test cases
+config CLK_GATE_KUNIT_TEST
+       tristate "Basic gate type Kunit test" if !KUNIT_ALL_TESTS
+       depends on KUNIT
+       default KUNIT_ALL_TESTS
+       help
+         Kunit test for the basic clk gate type.
+
 endif

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 16e588630472558cfdca46f8c19d537c545f3f15..6a98291350b64069b599a9eeb92e803127489009 100644 (file)
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_COMMON_CLK)        += clk-divider.o
 obj-$(CONFIG_COMMON_CLK)       += clk-fixed-factor.o
 obj-$(CONFIG_COMMON_CLK)       += clk-fixed-rate.o
 obj-$(CONFIG_COMMON_CLK)       += clk-gate.o
+obj-$(CONFIG_CLK_GATE_KUNIT_TEST) += clk-gate_test.o
 obj-$(CONFIG_COMMON_CLK)       += clk-multiplier.o
 obj-$(CONFIG_COMMON_CLK)       += clk-mux.o
 obj-$(CONFIG_COMMON_CLK)       += clk-composite.o

diff --git a/drivers/clk/clk-gate_test.c b/drivers/clk/clk-gate_test.c
new file mode 100644 (file)
index 0000000..e136aaa
--- /dev/null
+++ b/drivers/clk/clk-gate_test.c
@@ -0,0 +1,464 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Kunit test for clk gate basic type
+ */
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/platform_device.h>
+
+#include <kunit/test.h>
+
+static void clk_gate_register_test_dev(struct kunit *test)
+{
+       struct clk_hw *ret;
+       struct platform_device *pdev;
+
+       pdev = platform_device_register_simple("test_gate_device", -1, NULL, 0);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
+
+       ret = clk_hw_register_gate(&pdev->dev, "test_gate", NULL, 0, NULL,
+                                  0, 0, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ret);
+       KUNIT_EXPECT_STREQ(test, "test_gate", clk_hw_get_name(ret));
+       KUNIT_EXPECT_EQ(test, 0UL, clk_hw_get_flags(ret));
+
+       clk_hw_unregister_gate(ret);
+       platform_device_put(pdev);
+}
+
+static void clk_gate_register_test_parent_names(struct kunit *test)
+{
+       struct clk_hw *parent;
+       struct clk_hw *ret;
+
+       parent = clk_hw_register_fixed_rate(NULL, "test_parent", NULL, 0,
+                                           1000000);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
+
+       ret = clk_hw_register_gate(NULL, "test_gate", "test_parent", 0, NULL,
+                                  0, 0, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ret);
+       KUNIT_EXPECT_PTR_EQ(test, parent, clk_hw_get_parent(ret));
+
+       clk_hw_unregister_gate(ret);
+       clk_hw_unregister_fixed_rate(parent);
+}
+
+static void clk_gate_register_test_parent_data(struct kunit *test)
+{
+       struct clk_hw *parent;
+       struct clk_hw *ret;
+       struct clk_parent_data pdata = { };
+
+       parent = clk_hw_register_fixed_rate(NULL, "test_parent", NULL, 0,
+                                           1000000);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
+       pdata.hw = parent;
+
+       ret = clk_hw_register_gate_parent_data(NULL, "test_gate", &pdata, 0,
+                                              NULL, 0, 0, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ret);
+       KUNIT_EXPECT_PTR_EQ(test, parent, clk_hw_get_parent(ret));
+
+       clk_hw_unregister_gate(ret);
+       clk_hw_unregister_fixed_rate(parent);
+}
+
+static void clk_gate_register_test_parent_data_legacy(struct kunit *test)
+{
+       struct clk_hw *parent;
+       struct clk_hw *ret;
+       struct clk_parent_data pdata = { };
+
+       parent = clk_hw_register_fixed_rate(NULL, "test_parent", NULL, 0,
+                                           1000000);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
+       pdata.name = "test_parent";
+
+       ret = clk_hw_register_gate_parent_data(NULL, "test_gate", &pdata, 0,
+                                              NULL, 0, 0, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ret);
+       KUNIT_EXPECT_PTR_EQ(test, parent, clk_hw_get_parent(ret));
+
+       clk_hw_unregister_gate(ret);
+       clk_hw_unregister_fixed_rate(parent);
+}
+
+static void clk_gate_register_test_parent_hw(struct kunit *test)
+{
+       struct clk_hw *parent;
+       struct clk_hw *ret;
+
+       parent = clk_hw_register_fixed_rate(NULL, "test_parent", NULL, 0,
+                                           1000000);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
+
+       ret = clk_hw_register_gate_parent_hw(NULL, "test_gate", parent, 0, NULL,
+                                            0, 0, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ret);
+       KUNIT_EXPECT_PTR_EQ(test, parent, clk_hw_get_parent(ret));
+
+       clk_hw_unregister_gate(ret);
+       clk_hw_unregister_fixed_rate(parent);
+}
+
+static void clk_gate_register_test_hiword_invalid(struct kunit *test)
+{
+       struct clk_hw *ret;
+
+       ret = clk_hw_register_gate(NULL, "test_gate", NULL, 0, NULL,
+                                  20, CLK_GATE_HIWORD_MASK, NULL);
+
+       KUNIT_EXPECT_TRUE(test, IS_ERR(ret));
+}
+
+static struct kunit_case clk_gate_register_test_cases[] = {
+       KUNIT_CASE(clk_gate_register_test_dev),
+       KUNIT_CASE(clk_gate_register_test_parent_names),
+       KUNIT_CASE(clk_gate_register_test_parent_data),
+       KUNIT_CASE(clk_gate_register_test_parent_data_legacy),
+       KUNIT_CASE(clk_gate_register_test_parent_hw),
+       KUNIT_CASE(clk_gate_register_test_hiword_invalid),
+       {}
+};
+
+static struct kunit_suite clk_gate_register_test_suite = {
+       .name = "clk-gate-register-test",
+       .test_cases = clk_gate_register_test_cases,
+};
+
+struct clk_gate_test_context {
+       void __iomem *fake_mem;
+       struct clk_hw *hw;
+       struct clk_hw *parent;
+       u32 fake_reg; /* Keep at end, KASAN can detect out of bounds */
+};
+
+static struct clk_gate_test_context *clk_gate_test_alloc_ctx(struct kunit *test)
+{
+       struct clk_gate_test_context *ctx;
+
+       test->priv = ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+       ctx->fake_mem = (void __force __iomem *)&ctx->fake_reg;
+
+       return ctx;
+}
+
+static void clk_gate_test_parent_rate(struct kunit *test)
+{
+       struct clk_gate_test_context *ctx = test->priv;
+       struct clk_hw *parent = ctx->parent;
+       struct clk_hw *hw = ctx->hw;
+       unsigned long prate = clk_hw_get_rate(parent);
+       unsigned long rate = clk_hw_get_rate(hw);
+
+       KUNIT_EXPECT_EQ(test, prate, rate);
+}
+
+static void clk_gate_test_enable(struct kunit *test)
+{
+       struct clk_gate_test_context *ctx = test->priv;
+       struct clk_hw *parent = ctx->parent;
+       struct clk_hw *hw = ctx->hw;
+       struct clk *clk = hw->clk;
+       u32 enable_val = BIT(5);
+
+       KUNIT_ASSERT_EQ(test, clk_prepare_enable(clk), 0);
+
+       KUNIT_EXPECT_EQ(test, enable_val, ctx->fake_reg);
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_enabled(hw));
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_prepared(hw));
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_enabled(parent));
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_prepared(parent));
+}
+
+static void clk_gate_test_disable(struct kunit *test)
+{
+       struct clk_gate_test_context *ctx = test->priv;
+       struct clk_hw *parent = ctx->parent;
+       struct clk_hw *hw = ctx->hw;
+       struct clk *clk = hw->clk;
+       u32 enable_val = BIT(5);
+       u32 disable_val = 0;
+
+       KUNIT_ASSERT_EQ(test, clk_prepare_enable(clk), 0);
+       KUNIT_ASSERT_EQ(test, enable_val, ctx->fake_reg);
+
+       clk_disable_unprepare(clk);
+       KUNIT_EXPECT_EQ(test, disable_val, ctx->fake_reg);
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_enabled(hw));
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_prepared(hw));
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_enabled(parent));
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_prepared(parent));
+}
+
+static struct kunit_case clk_gate_test_cases[] = {
+       KUNIT_CASE(clk_gate_test_parent_rate),
+       KUNIT_CASE(clk_gate_test_enable),
+       KUNIT_CASE(clk_gate_test_disable),
+       {}
+};
+
+static int clk_gate_test_init(struct kunit *test)
+{
+       struct clk_hw *parent;
+       struct clk_hw *hw;
+       struct clk_gate_test_context *ctx;
+
+       ctx = clk_gate_test_alloc_ctx(test);
+       parent = clk_hw_register_fixed_rate(NULL, "test_parent", NULL, 0,
+                                           2000000);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
+
+       hw = clk_hw_register_gate_parent_hw(NULL, "test_gate", parent, 0,
+                                           ctx->fake_mem, 5, 0, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw);
+
+       ctx->hw = hw;
+       ctx->parent = parent;
+
+       return 0;
+}
+
+static void clk_gate_test_exit(struct kunit *test)
+{
+       struct clk_gate_test_context *ctx = test->priv;
+
+       clk_hw_unregister_gate(ctx->hw);
+       clk_hw_unregister_fixed_rate(ctx->parent);
+}
+
+static struct kunit_suite clk_gate_test_suite = {
+       .name = "clk-gate-test",
+       .init = clk_gate_test_init,
+       .exit = clk_gate_test_exit,
+       .test_cases = clk_gate_test_cases,
+};
+
+static void clk_gate_test_invert_enable(struct kunit *test)
+{
+       struct clk_gate_test_context *ctx = test->priv;
+       struct clk_hw *parent = ctx->parent;
+       struct clk_hw *hw = ctx->hw;
+       struct clk *clk = hw->clk;
+       u32 enable_val = 0;
+
+       KUNIT_ASSERT_EQ(test, clk_prepare_enable(clk), 0);
+
+       KUNIT_EXPECT_EQ(test, enable_val, ctx->fake_reg);
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_enabled(hw));
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_prepared(hw));
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_enabled(parent));
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_prepared(parent));
+}
+
+static void clk_gate_test_invert_disable(struct kunit *test)
+{
+       struct clk_gate_test_context *ctx = test->priv;
+       struct clk_hw *parent = ctx->parent;
+       struct clk_hw *hw = ctx->hw;
+       struct clk *clk = hw->clk;
+       u32 enable_val = 0;
+       u32 disable_val = BIT(15);
+
+       KUNIT_ASSERT_EQ(test, clk_prepare_enable(clk), 0);
+       KUNIT_ASSERT_EQ(test, enable_val, ctx->fake_reg);
+
+       clk_disable_unprepare(clk);
+       KUNIT_EXPECT_EQ(test, disable_val, ctx->fake_reg);
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_enabled(hw));
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_prepared(hw));
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_enabled(parent));
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_prepared(parent));
+}
+
+static struct kunit_case clk_gate_test_invert_cases[] = {
+       KUNIT_CASE(clk_gate_test_invert_enable),
+       KUNIT_CASE(clk_gate_test_invert_disable),
+       {}
+};
+
+static int clk_gate_test_invert_init(struct kunit *test)
+{
+       struct clk_hw *parent;
+       struct clk_hw *hw;
+       struct clk_gate_test_context *ctx;
+
+       ctx = clk_gate_test_alloc_ctx(test);
+       parent = clk_hw_register_fixed_rate(NULL, "test_parent", NULL, 0,
+                                           2000000);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
+
+       ctx->fake_reg = BIT(15); /* Default to off */
+       hw = clk_hw_register_gate_parent_hw(NULL, "test_gate", parent, 0,
+                                           ctx->fake_mem, 15,
+                                           CLK_GATE_SET_TO_DISABLE, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw);
+
+       ctx->hw = hw;
+       ctx->parent = parent;
+
+       return 0;
+}
+
+static struct kunit_suite clk_gate_test_invert_suite = {
+       .name = "clk-gate-invert-test",
+       .init = clk_gate_test_invert_init,
+       .exit = clk_gate_test_exit,
+       .test_cases = clk_gate_test_invert_cases,
+};
+
+static void clk_gate_test_hiword_enable(struct kunit *test)
+{
+       struct clk_gate_test_context *ctx = test->priv;
+       struct clk_hw *parent = ctx->parent;
+       struct clk_hw *hw = ctx->hw;
+       struct clk *clk = hw->clk;
+       u32 enable_val = BIT(9) | BIT(9 + 16);
+
+       KUNIT_ASSERT_EQ(test, clk_prepare_enable(clk), 0);
+
+       KUNIT_EXPECT_EQ(test, enable_val, ctx->fake_reg);
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_enabled(hw));
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_prepared(hw));
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_enabled(parent));
+       KUNIT_EXPECT_TRUE(test, clk_hw_is_prepared(parent));
+}
+
+static void clk_gate_test_hiword_disable(struct kunit *test)
+{
+       struct clk_gate_test_context *ctx = test->priv;
+       struct clk_hw *parent = ctx->parent;
+       struct clk_hw *hw = ctx->hw;
+       struct clk *clk = hw->clk;
+       u32 enable_val = BIT(9) | BIT(9 + 16);
+       u32 disable_val = BIT(9 + 16);
+
+       KUNIT_ASSERT_EQ(test, clk_prepare_enable(clk), 0);
+       KUNIT_ASSERT_EQ(test, enable_val, ctx->fake_reg);
+
+       clk_disable_unprepare(clk);
+       KUNIT_EXPECT_EQ(test, disable_val, ctx->fake_reg);
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_enabled(hw));
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_prepared(hw));
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_enabled(parent));
+       KUNIT_EXPECT_FALSE(test, clk_hw_is_prepared(parent));
+}
+
+static struct kunit_case clk_gate_test_hiword_cases[] = {
+       KUNIT_CASE(clk_gate_test_hiword_enable),
+       KUNIT_CASE(clk_gate_test_hiword_disable),
+       {}
+};
+
+static int clk_gate_test_hiword_init(struct kunit *test)
+{
+       struct clk_hw *parent;
+       struct clk_hw *hw;
+       struct clk_gate_test_context *ctx;
+
+       ctx = clk_gate_test_alloc_ctx(test);
+       parent = clk_hw_register_fixed_rate(NULL, "test_parent", NULL, 0,
+                                           2000000);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
+
+       hw = clk_hw_register_gate_parent_hw(NULL, "test_gate", parent, 0,
+                                           ctx->fake_mem, 9,
+                                           CLK_GATE_HIWORD_MASK, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw);
+
+       ctx->hw = hw;
+       ctx->parent = parent;
+
+       return 0;
+}
+
+static struct kunit_suite clk_gate_test_hiword_suite = {
+       .name = "clk-gate-hiword-test",
+       .init = clk_gate_test_hiword_init,
+       .exit = clk_gate_test_exit,
+       .test_cases = clk_gate_test_hiword_cases,
+};
+
+static void clk_gate_test_is_enabled(struct kunit *test)
+{
+       struct clk_hw *hw;
+       struct clk_gate_test_context *ctx;
+
+       ctx = clk_gate_test_alloc_ctx(test);
+       ctx->fake_reg = BIT(7);
+       hw = clk_hw_register_gate(NULL, "test_gate", NULL, 0, ctx->fake_mem, 7,
+                                 0, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw);
+       KUNIT_ASSERT_TRUE(test, clk_hw_is_enabled(hw));
+
+       clk_hw_unregister_gate(hw);
+}
+
+static void clk_gate_test_is_disabled(struct kunit *test)
+{
+       struct clk_hw *hw;
+       struct clk_gate_test_context *ctx;
+
+       ctx = clk_gate_test_alloc_ctx(test);
+       ctx->fake_reg = BIT(4);
+       hw = clk_hw_register_gate(NULL, "test_gate", NULL, 0, ctx->fake_mem, 7,
+                                 0, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw);
+       KUNIT_ASSERT_FALSE(test, clk_hw_is_enabled(hw));
+
+       clk_hw_unregister_gate(hw);
+}
+
+static void clk_gate_test_is_enabled_inverted(struct kunit *test)
+{
+       struct clk_hw *hw;
+       struct clk_gate_test_context *ctx;
+
+       ctx = clk_gate_test_alloc_ctx(test);
+       ctx->fake_reg = BIT(31);
+       hw = clk_hw_register_gate(NULL, "test_gate", NULL, 0, ctx->fake_mem, 2,
+                                 CLK_GATE_SET_TO_DISABLE, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw);
+       KUNIT_ASSERT_TRUE(test, clk_hw_is_enabled(hw));
+
+       clk_hw_unregister_gate(hw);
+}
+
+static void clk_gate_test_is_disabled_inverted(struct kunit *test)
+{
+       struct clk_hw *hw;
+       struct clk_gate_test_context *ctx;
+
+       ctx = clk_gate_test_alloc_ctx(test);
+       ctx->fake_reg = BIT(29);
+       hw = clk_hw_register_gate(NULL, "test_gate", NULL, 0, ctx->fake_mem, 29,
+                                 CLK_GATE_SET_TO_DISABLE, NULL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw);
+       KUNIT_ASSERT_FALSE(test, clk_hw_is_enabled(hw));
+
+       clk_hw_unregister_gate(hw);
+}
+
+static struct kunit_case clk_gate_test_enabled_cases[] = {
+       KUNIT_CASE(clk_gate_test_is_enabled),
+       KUNIT_CASE(clk_gate_test_is_disabled),
+       KUNIT_CASE(clk_gate_test_is_enabled_inverted),
+       KUNIT_CASE(clk_gate_test_is_disabled_inverted),
+       {}
+};
+
+static struct kunit_suite clk_gate_test_enabled_suite = {
+       .name = "clk-gate-is_enabled-test",
+       .test_cases = clk_gate_test_enabled_cases,
+};
+
+kunit_test_suites(
+       &clk_gate_register_test_suite,
+       &clk_gate_test_suite,
+       &clk_gate_test_invert_suite,
+       &clk_gate_test_hiword_suite,
+       &clk_gate_test_enabled_suite
+);
+MODULE_LICENSE("GPL v2");