[PATCH v2 00/11] drm: kunit: Switch to kunit actions

[PATCH v2 00/11] drm: kunit: Switch to kunit actions

[Maxime Ripard]

Hi,

Since v6.5-rc1, kunit gained a devm/drmm-like mechanism that makes tests
resources much easier to cleanup.

This series converts the existing tests to use those new actions where
relevant.

Let me know what you think,
Maxime

Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
Changes in v2:
- Fix some typos
- Use plaltform_device_del instead of removing the call to
  platform_device_put after calling platform_device_add
- Link to v1: https://lore.kernel.org/r/20230710-kms-kunit-actions-rework-v1-0-722c58d72c72@kernel.org

---
Maxime Ripard (11):
      drm/tests: helpers: Switch to kunit actions
      drm/tests: client-modeset: Remove call to drm_kunit_helper_free_device()
      drm/tests: modes: Remove call to drm_kunit_helper_free_device()
      drm/tests: probe-helper: Remove call to drm_kunit_helper_free_device()
      drm/tests: helpers: Create a helper to allocate a locking ctx
      drm/tests: helpers: Create a helper to allocate an atomic state
      drm/vc4: tests: pv-muxing: Remove call to drm_kunit_helper_free_device()
      drm/vc4: tests: mock: Use a kunit action to unregister DRM device
      drm/vc4: tests: pv-muxing: Switch to managed locking init
      drm/vc4: tests: Switch to atomic state allocation helper
      drm/vc4: tests: pv-muxing: Document test scenario

 drivers/gpu/drm/tests/drm_client_modeset_test.c |   8 --
 drivers/gpu/drm/tests/drm_kunit_helpers.c       | 108 +++++++++++++++++++++-
 drivers/gpu/drm/tests/drm_modes_test.c          |   8 --
 drivers/gpu/drm/tests/drm_probe_helper_test.c   |   8 --
 drivers/gpu/drm/vc4/tests/vc4_mock.c            |   5 ++
 drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c  | 115 +++++++++---------------
 include/drm/drm_kunit_helpers.h                 |   7 ++
 7 files changed, 158 insertions(+), 101 deletions(-)
---
base-commit: c58c49dd89324b18a812762a2bfa5a0458e4f252
change-id: 20230710-kms-kunit-actions-rework-5d163762c93b

Best regards,
-- 
Maxime Ripard <mripard@kernel.org>

[PATCH v2 01/11] drm/tests: helpers: Switch to kunit actions

[Maxime Ripard]

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/tests/drm_kunit_helpers.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
index 4df47071dc88..5856beb7f7d7 100644
--- a/drivers/gpu/drm/tests/drm_kunit_helpers.c
+++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
@@ -35,8 +35,8 @@ static struct platform_driver fake_platform_driver = {
  * able to leverage the usual infrastructure and most notably the
  * device-managed resources just like a "real" device.
  *
- * Callers need to make sure drm_kunit_helper_free_device() on the
- * device when done.
+ * Resources will be cleaned up automatically, but the removal can be
+ * forced using @drm_kunit_helper_free_device.
  *
  * Returns:
  * A pointer to the new device, or an ERR_PTR() otherwise.
@@ -49,12 +49,27 @@ struct device *drm_kunit_helper_alloc_device(struct kunit *test)
 	ret = platform_driver_register(&fake_platform_driver);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
+	ret = kunit_add_action_or_reset(test,
+					(kunit_action_t *)platform_driver_unregister,
+					&fake_platform_driver);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
 	pdev = platform_device_alloc(KUNIT_DEVICE_NAME, PLATFORM_DEVID_NONE);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
 
+	ret = kunit_add_action_or_reset(test,
+					(kunit_action_t *)platform_device_put,
+					pdev);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
 	ret = platform_device_add(pdev);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
+	ret = kunit_add_action_or_reset(test,
+					(kunit_action_t *)platform_device_del,
+					pdev);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
 	return &pdev->dev;
 }
 EXPORT_SYMBOL_GPL(drm_kunit_helper_alloc_device);
@@ -70,8 +85,13 @@ void drm_kunit_helper_free_device(struct kunit *test, struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 
-	platform_device_unregister(pdev);
-	platform_driver_unregister(&fake_platform_driver);
+	kunit_release_action(test,
+			     (kunit_action_t *)platform_device_unregister,
+			     pdev);
+
+	kunit_release_action(test,
+			     (kunit_action_t *)platform_driver_unregister,
+			     &fake_platform_driver);
 }
 EXPORT_SYMBOL_GPL(drm_kunit_helper_free_device);
 

-- 
2.41.0

Re: [PATCH v2 01/11] drm/tests: helpers: Switch to kunit actions

[kernel test robot]

Hi Maxime,

kernel test robot noticed the following build warnings:

[auto build test WARNING on c58c49dd89324b18a812762a2bfa5a0458e4f252]

url:    https://github.com/intel-lab-lkp/linux/commits/Maxime-Ripard/drm-tests-helpers-Switch-to-kunit-actions/20230720-191901
base:   c58c49dd89324b18a812762a2bfa5a0458e4f252
patch link:    https://lore.kernel.org/r/20230720-kms-kunit-actions-rework-v2-1-175017bd56ab%40kernel.org
patch subject: [PATCH v2 01/11] drm/tests: helpers: Switch to kunit actions
config: arm64-randconfig-r022-20230720 (https://download.01.org/0day-ci/archive/20230721/202307210148.7gWzLOtn-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230721/202307210148.7gWzLOtn-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307210148.7gWzLOtn-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/tests/drm_kunit_helpers.c:53:6: warning: cast from 'void (*)(struct platform_driver *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
      53 |                                         (kunit_action_t *)platform_driver_unregister,
         |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/tests/drm_kunit_helpers.c:61:6: warning: cast from 'void (*)(struct platform_device *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
      61 |                                         (kunit_action_t *)platform_device_put,
         |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/tests/drm_kunit_helpers.c:69:6: warning: cast from 'void (*)(struct platform_device *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
      69 |                                         (kunit_action_t *)platform_device_del,
         |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/tests/drm_kunit_helpers.c:89:9: warning: cast from 'void (*)(struct platform_device *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
      89 |                              (kunit_action_t *)platform_device_unregister,
         |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/tests/drm_kunit_helpers.c:93:9: warning: cast from 'void (*)(struct platform_driver *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
      93 |                              (kunit_action_t *)platform_driver_unregister,
         |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   5 warnings generated.


vim +53 drivers/gpu/drm/tests/drm_kunit_helpers.c

    28	
    29	/**
    30	 * drm_kunit_helper_alloc_device - Allocate a mock device for a KUnit test
    31	 * @test: The test context object
    32	 *
    33	 * This allocates a fake struct &device to create a mock for a KUnit
    34	 * test. The device will also be bound to a fake driver. It will thus be
    35	 * able to leverage the usual infrastructure and most notably the
    36	 * device-managed resources just like a "real" device.
    37	 *
    38	 * Resources will be cleaned up automatically, but the removal can be
    39	 * forced using @drm_kunit_helper_free_device.
    40	 *
    41	 * Returns:
    42	 * A pointer to the new device, or an ERR_PTR() otherwise.
    43	 */
    44	struct device *drm_kunit_helper_alloc_device(struct kunit *test)
    45	{
    46		struct platform_device *pdev;
    47		int ret;
    48	
    49		ret = platform_driver_register(&fake_platform_driver);
    50		KUNIT_ASSERT_EQ(test, ret, 0);
    51	
    52		ret = kunit_add_action_or_reset(test,
  > 53						(kunit_action_t *)platform_driver_unregister,
    54						&fake_platform_driver);
    55		KUNIT_ASSERT_EQ(test, ret, 0);
    56	
    57		pdev = platform_device_alloc(KUNIT_DEVICE_NAME, PLATFORM_DEVID_NONE);
    58		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
    59	
    60		ret = kunit_add_action_or_reset(test,
  > 61						(kunit_action_t *)platform_device_put,
    62						pdev);
    63		KUNIT_ASSERT_EQ(test, ret, 0);
    64	
    65		ret = platform_device_add(pdev);
    66		KUNIT_ASSERT_EQ(test, ret, 0);
    67	
    68		ret = kunit_add_action_or_reset(test,
    69						(kunit_action_t *)platform_device_del,
    70						pdev);
    71		KUNIT_ASSERT_EQ(test, ret, 0);
    72	
    73		return &pdev->dev;
    74	}
    75	EXPORT_SYMBOL_GPL(drm_kunit_helper_alloc_device);
    76	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH v2 01/11] drm/tests: helpers: Switch to kunit actions

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 1875 bytes --]

Hi David, Brendan,

On Fri, Jul 21, 2023 at 01:14:41AM +0800, kernel test robot wrote:
> Hi Maxime,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on c58c49dd89324b18a812762a2bfa5a0458e4f252]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Maxime-Ripard/drm-tests-helpers-Switch-to-kunit-actions/20230720-191901
> base:   c58c49dd89324b18a812762a2bfa5a0458e4f252
> patch link:    https://lore.kernel.org/r/20230720-kms-kunit-actions-rework-v2-1-175017bd56ab%40kernel.org
> patch subject: [PATCH v2 01/11] drm/tests: helpers: Switch to kunit actions
> config: arm64-randconfig-r022-20230720 (https://download.01.org/0day-ci/archive/20230721/202307210148.7gWzLOtn-lkp@intel.com/config)
> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
> reproduce: (https://download.01.org/0day-ci/archive/20230721/202307210148.7gWzLOtn-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202307210148.7gWzLOtn-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
> >> drivers/gpu/drm/tests/drm_kunit_helpers.c:53:6: warning: cast from 'void (*)(struct platform_driver *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
>       53 |                                         (kunit_action_t *)platform_driver_unregister,
>          |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I missed that warning before, and I don't think we can address that
easily. Should we give up on kunit_action_t entirely?

Maxime

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[PATCH v2 02/11] drm/tests: client-modeset: Remove call to drm_kunit_helper_free_device()

[Maxime Ripard]

Calling drm_kunit_helper_free_device() to clean up the resources
allocated by drm_kunit_helper_alloc_device() is now optional and not
needed in most cases.

Remove it.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/tests/drm_client_modeset_test.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_client_modeset_test.c b/drivers/gpu/drm/tests/drm_client_modeset_test.c
index 416a279b6dae..7516f6cb36e4 100644
--- a/drivers/gpu/drm/tests/drm_client_modeset_test.c
+++ b/drivers/gpu/drm/tests/drm_client_modeset_test.c
@@ -82,13 +82,6 @@ static int drm_client_modeset_test_init(struct kunit *test)
 	return 0;
 }
 
-static void drm_client_modeset_test_exit(struct kunit *test)
-{
-	struct drm_client_modeset_test_priv *priv = test->priv;
-
-	drm_kunit_helper_free_device(test, priv->dev);
-}
-
 static void drm_test_pick_cmdline_res_1920_1080_60(struct kunit *test)
 {
 	struct drm_client_modeset_test_priv *priv = test->priv;
@@ -188,7 +181,6 @@ static struct kunit_case drm_test_pick_cmdline_tests[] = {
 static struct kunit_suite drm_test_pick_cmdline_test_suite = {
 	.name = "drm_test_pick_cmdline",
 	.init = drm_client_modeset_test_init,
-	.exit = drm_client_modeset_test_exit,
 	.test_cases = drm_test_pick_cmdline_tests
 };
 

-- 
2.41.0

[PATCH v2 03/11] drm/tests: modes: Remove call to drm_kunit_helper_free_device()

[Maxime Ripard]

Calling drm_kunit_helper_free_device() to clean up the resources
allocated by drm_kunit_helper_alloc_device() is now optional and not
needed in most cases.

Remove it.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/tests/drm_modes_test.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_modes_test.c b/drivers/gpu/drm/tests/drm_modes_test.c
index bc4aa2ce78be..1e9f63fbfead 100644
--- a/drivers/gpu/drm/tests/drm_modes_test.c
+++ b/drivers/gpu/drm/tests/drm_modes_test.c
@@ -36,13 +36,6 @@ static int drm_test_modes_init(struct kunit *test)
 	return 0;
 }
 
-static void drm_test_modes_exit(struct kunit *test)
-{
-	struct drm_test_modes_priv *priv = test->priv;
-
-	drm_kunit_helper_free_device(test, priv->dev);
-}
-
 static void drm_test_modes_analog_tv_ntsc_480i(struct kunit *test)
 {
 	struct drm_test_modes_priv *priv = test->priv;
@@ -148,7 +141,6 @@ static struct kunit_case drm_modes_analog_tv_tests[] = {
 static struct kunit_suite drm_modes_analog_tv_test_suite = {
 	.name = "drm_modes_analog_tv",
 	.init = drm_test_modes_init,
-	.exit = drm_test_modes_exit,
 	.test_cases = drm_modes_analog_tv_tests,
 };
 

-- 
2.41.0

[PATCH v2 04/11] drm/tests: probe-helper: Remove call to drm_kunit_helper_free_device()

[Maxime Ripard]

Calling drm_kunit_helper_free_device() to clean up the resources
allocated by drm_kunit_helper_alloc_device() is now optional and not
needed in most cases.

Remove it.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/tests/drm_probe_helper_test.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_probe_helper_test.c b/drivers/gpu/drm/tests/drm_probe_helper_test.c
index 0ee65828623e..1a2044070a6c 100644
--- a/drivers/gpu/drm/tests/drm_probe_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_probe_helper_test.c
@@ -60,13 +60,6 @@ static int drm_probe_helper_test_init(struct kunit *test)
 	return 0;
 }
 
-static void drm_probe_helper_test_exit(struct kunit *test)
-{
-	struct drm_probe_helper_test_priv *priv = test->priv;
-
-	drm_kunit_helper_free_device(test, priv->dev);
-}
-
 typedef struct drm_display_mode *(*expected_mode_func_t)(struct drm_device *);
 
 struct drm_connector_helper_tv_get_modes_test {
@@ -208,7 +201,6 @@ static struct kunit_case drm_test_connector_helper_tv_get_modes_tests[] = {
 static struct kunit_suite drm_test_connector_helper_tv_get_modes_suite = {
 	.name = "drm_connector_helper_tv_get_modes",
 	.init = drm_probe_helper_test_init,
-	.exit = drm_probe_helper_test_exit,
 	.test_cases = drm_test_connector_helper_tv_get_modes_tests,
 };
 

-- 
2.41.0

[PATCH v2 05/11] drm/tests: helpers: Create a helper to allocate a locking ctx

[Maxime Ripard]

As we get more and more tests, the locking context initialisation
creates more and more boilerplate, both at creation and destruction.

Let's create a helper that will allocate, initialise a context, and
register kunit actions to clean up once the test is done.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/tests/drm_kunit_helpers.c | 41 +++++++++++++++++++++++++++++++
 include/drm/drm_kunit_helpers.h           |  2 ++
 2 files changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
index 5856beb7f7d7..5130d4553262 100644
--- a/drivers/gpu/drm/tests/drm_kunit_helpers.c
+++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
@@ -120,5 +120,46 @@ __drm_kunit_helper_alloc_drm_device_with_driver(struct kunit *test,
 }
 EXPORT_SYMBOL_GPL(__drm_kunit_helper_alloc_drm_device_with_driver);
 
+static void action_drm_release_context(void *ptr)
+{
+	struct drm_modeset_acquire_ctx *ctx = ptr;
+
+	drm_modeset_drop_locks(ctx);
+	drm_modeset_acquire_fini(ctx);
+}
+
+/**
+ * drm_kunit_helper_context_alloc - Allocates an acquire context
+ * @test: The test context object
+ *
+ * Allocates and initializes a modeset acquire context.
+ *
+ * The context is tied to the kunit test context, so we must not call
+ * drm_modeset_acquire_fini() on it, it will be done so automatically.
+ *
+ * Returns:
+ * An ERR_PTR on error, a pointer to the newly allocated context otherwise
+ */
+struct drm_modeset_acquire_ctx *
+drm_kunit_helper_acquire_ctx_alloc(struct kunit *test)
+{
+	struct drm_modeset_acquire_ctx *ctx;
+	int ret;
+
+	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, ctx);
+
+	drm_modeset_acquire_init(ctx, 0);
+
+	ret = kunit_add_action_or_reset(test,
+					action_drm_release_context,
+					ctx);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return ctx;
+}
+EXPORT_SYMBOL_GPL(drm_kunit_helper_acquire_ctx_alloc);
+
 MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
 MODULE_LICENSE("GPL");
diff --git a/include/drm/drm_kunit_helpers.h b/include/drm/drm_kunit_helpers.h
index ed013fdcc1ff..4ba5e10653c6 100644
--- a/include/drm/drm_kunit_helpers.h
+++ b/include/drm/drm_kunit_helpers.h
@@ -87,5 +87,7 @@ __drm_kunit_helper_alloc_drm_device(struct kunit *test,
 						      sizeof(_type),		\
 						      offsetof(_type, _member),	\
 						      _feat))
+struct drm_modeset_acquire_ctx *
+drm_kunit_helper_acquire_ctx_alloc(struct kunit *test);
 
 #endif // DRM_KUNIT_HELPERS_H_

-- 
2.41.0

Re: [PATCH v2 05/11] drm/tests: helpers: Create a helper to allocate a locking ctx

[kernel test robot]

Hi Maxime,

kernel test robot noticed the following build warnings:

[auto build test WARNING on c58c49dd89324b18a812762a2bfa5a0458e4f252]

url:    https://github.com/intel-lab-lkp/linux/commits/Maxime-Ripard/drm-tests-helpers-Switch-to-kunit-actions/20230720-191901
base:   c58c49dd89324b18a812762a2bfa5a0458e4f252
patch link:    https://lore.kernel.org/r/20230720-kms-kunit-actions-rework-v2-5-175017bd56ab%40kernel.org
patch subject: [PATCH v2 05/11] drm/tests: helpers: Create a helper to allocate a locking ctx
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20230720/202307202244.26VyeZKj-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230720/202307202244.26VyeZKj-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307202244.26VyeZKj-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/tests/drm_kunit_helpers.c:145: warning: expecting prototype for drm_kunit_helper_context_alloc(). Prototype was for drm_kunit_helper_acquire_ctx_alloc() instead


vim +145 drivers/gpu/drm/tests/drm_kunit_helpers.c

   130	
   131	/**
   132	 * drm_kunit_helper_context_alloc - Allocates an acquire context
   133	 * @test: The test context object
   134	 *
   135	 * Allocates and initializes a modeset acquire context.
   136	 *
   137	 * The context is tied to the kunit test context, so we must not call
   138	 * drm_modeset_acquire_fini() on it, it will be done so automatically.
   139	 *
   140	 * Returns:
   141	 * An ERR_PTR on error, a pointer to the newly allocated context otherwise
   142	 */
   143	struct drm_modeset_acquire_ctx *
   144	drm_kunit_helper_acquire_ctx_alloc(struct kunit *test)
 > 145	{
   146		struct drm_modeset_acquire_ctx *ctx;
   147		int ret;
   148	
   149		ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
   150		KUNIT_ASSERT_NOT_NULL(test, ctx);
   151	
   152		drm_modeset_acquire_init(ctx, 0);
   153	
   154		ret = kunit_add_action_or_reset(test,
   155						action_drm_release_context,
   156						ctx);
   157		if (ret)
   158			return ERR_PTR(ret);
   159	
   160		return ctx;
   161	}
   162	EXPORT_SYMBOL_GPL(drm_kunit_helper_acquire_ctx_alloc);
   163	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

[PATCH v2 06/11] drm/tests: helpers: Create a helper to allocate an atomic state

[Maxime Ripard]

As we gain more tests, boilerplate to allocate an atomic state and free
it starts to be there more and more as well.

In order to reduce the allocation boilerplate, we can create a helper
to create that atomic state, and call an action when the test is done.
This will also clean up the exit path.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/tests/drm_kunit_helpers.c | 39 +++++++++++++++++++++++++++++++
 include/drm/drm_kunit_helpers.h           |  5 ++++
 2 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
index 5130d4553262..d3b2c6b48163 100644
--- a/drivers/gpu/drm/tests/drm_kunit_helpers.c
+++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 
+#include <drm/drm_atomic.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_kunit_helpers.h>
 #include <drm/drm_managed.h>
@@ -161,5 +162,43 @@ drm_kunit_helper_acquire_ctx_alloc(struct kunit *test)
 }
 EXPORT_SYMBOL_GPL(drm_kunit_helper_acquire_ctx_alloc);
 
+/**
+ * drm_kunit_helper_atomic_state_alloc - Allocates an atomic state
+ * @test: The test context object
+ * @drm: The device to alloc the state for
+ * @ctx: Locking context for that atomic update
+ *
+ * Allocates a empty atomic state.
+ *
+ * The state is tied to the kunit test context, so we must not call
+ * drm_atomic_state_put() on it, it will be done so automatically.
+ *
+ * Returns:
+ * An ERR_PTR on error, a pointer to the newly allocated state otherwise
+ */
+struct drm_atomic_state *
+drm_kunit_helper_atomic_state_alloc(struct kunit *test,
+				    struct drm_device *drm,
+				    struct drm_modeset_acquire_ctx *ctx)
+{
+	struct drm_atomic_state *state;
+	int ret;
+
+	state = drm_atomic_state_alloc(drm);
+	if (!state)
+		return ERR_PTR(-ENOMEM);
+
+	ret = kunit_add_action_or_reset(test,
+					(kunit_action_t *)drm_atomic_state_put,
+					state);
+	if (ret)
+		return ERR_PTR(ret);
+
+	state->acquire_ctx = ctx;
+
+	return state;
+}
+EXPORT_SYMBOL_GPL(drm_kunit_helper_atomic_state_alloc);
+
 MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
 MODULE_LICENSE("GPL");
diff --git a/include/drm/drm_kunit_helpers.h b/include/drm/drm_kunit_helpers.h
index 4ba5e10653c6..514c8a7a32f0 100644
--- a/include/drm/drm_kunit_helpers.h
+++ b/include/drm/drm_kunit_helpers.h
@@ -90,4 +90,9 @@ __drm_kunit_helper_alloc_drm_device(struct kunit *test,
 struct drm_modeset_acquire_ctx *
 drm_kunit_helper_acquire_ctx_alloc(struct kunit *test);
 
+struct drm_atomic_state *
+drm_kunit_helper_atomic_state_alloc(struct kunit *test,
+				    struct drm_device *drm,
+				    struct drm_modeset_acquire_ctx *ctx);
+
 #endif // DRM_KUNIT_HELPERS_H_

-- 
2.41.0

Re: [PATCH v2 06/11] drm/tests: helpers: Create a helper to allocate an atomic state

[kernel test robot]

Hi Maxime,

kernel test robot noticed the following build warnings:

[auto build test WARNING on c58c49dd89324b18a812762a2bfa5a0458e4f252]

url:    https://github.com/intel-lab-lkp/linux/commits/Maxime-Ripard/drm-tests-helpers-Switch-to-kunit-actions/20230720-191901
base:   c58c49dd89324b18a812762a2bfa5a0458e4f252
patch link:    https://lore.kernel.org/r/20230720-kms-kunit-actions-rework-v2-6-175017bd56ab%40kernel.org
patch subject: [PATCH v2 06/11] drm/tests: helpers: Create a helper to allocate an atomic state
config: arm64-randconfig-r022-20230720 (https://download.01.org/0day-ci/archive/20230721/202307210124.Ur3UNuxZ-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230721/202307210124.Ur3UNuxZ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307210124.Ur3UNuxZ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/tests/drm_kunit_helpers.c:54:6: warning: cast from 'void (*)(struct platform_driver *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
      54 |                                         (kunit_action_t *)platform_driver_unregister,
         |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/tests/drm_kunit_helpers.c:62:6: warning: cast from 'void (*)(struct platform_device *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
      62 |                                         (kunit_action_t *)platform_device_put,
         |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/tests/drm_kunit_helpers.c:70:6: warning: cast from 'void (*)(struct platform_device *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
      70 |                                         (kunit_action_t *)platform_device_del,
         |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/tests/drm_kunit_helpers.c:90:9: warning: cast from 'void (*)(struct platform_device *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
      90 |                              (kunit_action_t *)platform_device_unregister,
         |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/tests/drm_kunit_helpers.c:94:9: warning: cast from 'void (*)(struct platform_driver *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
      94 |                              (kunit_action_t *)platform_driver_unregister,
         |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/tests/drm_kunit_helpers.c:192:6: warning: cast from 'void (*)(struct drm_atomic_state *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
     192 |                                         (kunit_action_t *)drm_atomic_state_put,
         |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   6 warnings generated.


vim +192 drivers/gpu/drm/tests/drm_kunit_helpers.c

   164	
   165	/**
   166	 * drm_kunit_helper_atomic_state_alloc - Allocates an atomic state
   167	 * @test: The test context object
   168	 * @drm: The device to alloc the state for
   169	 * @ctx: Locking context for that atomic update
   170	 *
   171	 * Allocates a empty atomic state.
   172	 *
   173	 * The state is tied to the kunit test context, so we must not call
   174	 * drm_atomic_state_put() on it, it will be done so automatically.
   175	 *
   176	 * Returns:
   177	 * An ERR_PTR on error, a pointer to the newly allocated state otherwise
   178	 */
   179	struct drm_atomic_state *
   180	drm_kunit_helper_atomic_state_alloc(struct kunit *test,
   181					    struct drm_device *drm,
   182					    struct drm_modeset_acquire_ctx *ctx)
   183	{
   184		struct drm_atomic_state *state;
   185		int ret;
   186	
   187		state = drm_atomic_state_alloc(drm);
   188		if (!state)
   189			return ERR_PTR(-ENOMEM);
   190	
   191		ret = kunit_add_action_or_reset(test,
 > 192						(kunit_action_t *)drm_atomic_state_put,
   193						state);
   194		if (ret)
   195			return ERR_PTR(ret);
   196	
   197		state->acquire_ctx = ctx;
   198	
   199		return state;
   200	}
   201	EXPORT_SYMBOL_GPL(drm_kunit_helper_atomic_state_alloc);
   202	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

[PATCH v2 07/11] drm/vc4: tests: pv-muxing: Remove call to drm_kunit_helper_free_device()

[Maxime Ripard]

Calling drm_kunit_helper_free_device() to clean up the resources
allocated by drm_kunit_helper_alloc_device() is now optional and not
needed in most cases.

Remove it.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
index ae0bd0f81698..6c982e72cae8 100644
--- a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
+++ b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
@@ -762,7 +762,6 @@ static void vc4_pv_muxing_test_exit(struct kunit *test)
 	drm_modeset_drop_locks(&priv->ctx);
 	drm_modeset_acquire_fini(&priv->ctx);
 	drm_dev_unregister(drm);
-	drm_kunit_helper_free_device(test, vc4->dev);
 }
 
 static struct kunit_case vc4_pv_muxing_tests[] = {
@@ -873,7 +872,6 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes
 	drm_modeset_drop_locks(&ctx);
 	drm_modeset_acquire_fini(&ctx);
 	drm_dev_unregister(drm);
-	drm_kunit_helper_free_device(test, vc4->dev);
 }
 
 static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
@@ -963,7 +961,6 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
 	drm_modeset_drop_locks(&ctx);
 	drm_modeset_acquire_fini(&ctx);
 	drm_dev_unregister(drm);
-	drm_kunit_helper_free_device(test, vc4->dev);
 }
 
 static void
@@ -1017,7 +1014,6 @@ drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct ku
 	drm_modeset_drop_locks(&ctx);
 	drm_modeset_acquire_fini(&ctx);
 	drm_dev_unregister(drm);
-	drm_kunit_helper_free_device(test, vc4->dev);
 }
 
 static struct kunit_case vc5_pv_muxing_bugs_tests[] = {

-- 
2.41.0

[PATCH v2 08/11] drm/vc4: tests: mock: Use a kunit action to unregister DRM device

[Maxime Ripard]

The *_mock_device functions allocate a DRM device that needs to be
released using drm_dev_unregister.

Now that we have a kunit release action API, we can switch to it and
don't require any kind of garbage collection from the caller.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/vc4/tests/vc4_mock.c           | 5 +++++
 drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c | 6 ------
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/vc4/tests/vc4_mock.c b/drivers/gpu/drm/vc4/tests/vc4_mock.c
index a4bed26af32f..00825ddc52f0 100644
--- a/drivers/gpu/drm/vc4/tests/vc4_mock.c
+++ b/drivers/gpu/drm/vc4/tests/vc4_mock.c
@@ -186,6 +186,11 @@ static struct vc4_dev *__mock_device(struct kunit *test, bool is_vc5)
 	ret = drm_dev_register(drm, 0);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
+	ret = kunit_add_action_or_reset(test,
+					(kunit_action_t *)drm_dev_unregister,
+					drm);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
 	return vc4;
 }
 
diff --git a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
index 6c982e72cae8..776a7b01608f 100644
--- a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
+++ b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
@@ -754,14 +754,11 @@ static int vc4_pv_muxing_test_init(struct kunit *test)
 static void vc4_pv_muxing_test_exit(struct kunit *test)
 {
 	struct pv_muxing_priv *priv = test->priv;
-	struct vc4_dev *vc4 = priv->vc4;
-	struct drm_device *drm = &vc4->base;
 	struct drm_atomic_state *state = priv->state;
 
 	drm_atomic_state_put(state);
 	drm_modeset_drop_locks(&priv->ctx);
 	drm_modeset_acquire_fini(&priv->ctx);
-	drm_dev_unregister(drm);
 }
 
 static struct kunit_case vc4_pv_muxing_tests[] = {
@@ -871,7 +868,6 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes
 	drm_atomic_state_put(state);
 	drm_modeset_drop_locks(&ctx);
 	drm_modeset_acquire_fini(&ctx);
-	drm_dev_unregister(drm);
 }
 
 static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
@@ -960,7 +956,6 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
 	drm_atomic_state_put(state);
 	drm_modeset_drop_locks(&ctx);
 	drm_modeset_acquire_fini(&ctx);
-	drm_dev_unregister(drm);
 }
 
 static void
@@ -1013,7 +1008,6 @@ drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct ku
 	drm_atomic_state_put(state);
 	drm_modeset_drop_locks(&ctx);
 	drm_modeset_acquire_fini(&ctx);
-	drm_dev_unregister(drm);
 }
 
 static struct kunit_case vc5_pv_muxing_bugs_tests[] = {

-- 
2.41.0

[PATCH v2 09/11] drm/vc4: tests: pv-muxing: Switch to managed locking init

[Maxime Ripard]

The new helper to init the locking context allows to remove some
boilerplate.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c | 42 ++++++++++++--------------
 1 file changed, 19 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
index 776a7b01608f..ff1deaed0cab 100644
--- a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
+++ b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
@@ -20,7 +20,6 @@
 
 struct pv_muxing_priv {
 	struct vc4_dev *vc4;
-	struct drm_modeset_acquire_ctx ctx;
 	struct drm_atomic_state *state;
 };
 
@@ -725,6 +724,7 @@ static void drm_vc4_test_pv_muxing_invalid(struct kunit *test)
 static int vc4_pv_muxing_test_init(struct kunit *test)
 {
 	const struct pv_muxing_param *params = test->param_value;
+	struct drm_modeset_acquire_ctx *ctx;
 	struct drm_atomic_state *state;
 	struct pv_muxing_priv *priv;
 	struct drm_device *drm;
@@ -738,13 +738,14 @@ static int vc4_pv_muxing_test_init(struct kunit *test)
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vc4);
 	priv->vc4 = vc4;
 
-	drm_modeset_acquire_init(&priv->ctx, 0);
+	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 
 	drm = &vc4->base;
 	state = drm_atomic_state_alloc(drm);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = &priv->ctx;
+	state->acquire_ctx = ctx;
 
 	priv->state = state;
 
@@ -757,8 +758,6 @@ static void vc4_pv_muxing_test_exit(struct kunit *test)
 	struct drm_atomic_state *state = priv->state;
 
 	drm_atomic_state_put(state);
-	drm_modeset_drop_locks(&priv->ctx);
-	drm_modeset_acquire_fini(&priv->ctx);
 }
 
 static struct kunit_case vc4_pv_muxing_tests[] = {
@@ -798,7 +797,7 @@ static struct kunit_suite vc5_pv_muxing_test_suite = {
  */
 static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *test)
 {
-	struct drm_modeset_acquire_ctx ctx;
+	struct drm_modeset_acquire_ctx *ctx;
 	struct drm_atomic_state *state;
 	struct vc4_crtc_state *new_vc4_crtc_state;
 	struct vc4_hvs_state *new_hvs_state;
@@ -811,13 +810,14 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes
 	vc4 = vc5_mock_device(test);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vc4);
 
-	drm_modeset_acquire_init(&ctx, 0);
+	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 
 	drm = &vc4->base;
 	state = drm_atomic_state_alloc(drm);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = &ctx;
+	state->acquire_ctx = ctx;
 
 	ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI0);
 	KUNIT_ASSERT_EQ(test, ret, 0);
@@ -844,7 +844,7 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes
 	state = drm_atomic_state_alloc(drm);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = &ctx;
+	state->acquire_ctx = ctx;
 
 	ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI1);
 	KUNIT_ASSERT_EQ(test, ret, 0);
@@ -866,13 +866,11 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes
 	KUNIT_EXPECT_NE(test, hdmi0_channel, hdmi1_channel);
 
 	drm_atomic_state_put(state);
-	drm_modeset_drop_locks(&ctx);
-	drm_modeset_acquire_fini(&ctx);
 }
 
 static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
 {
-	struct drm_modeset_acquire_ctx ctx;
+	struct drm_modeset_acquire_ctx *ctx;
 	struct drm_atomic_state *state;
 	struct vc4_crtc_state *new_vc4_crtc_state;
 	struct vc4_hvs_state *new_hvs_state;
@@ -885,13 +883,14 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
 	vc4 = vc5_mock_device(test);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vc4);
 
-	drm_modeset_acquire_init(&ctx, 0);
+	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 
 	drm = &vc4->base;
 	state = drm_atomic_state_alloc(drm);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = &ctx;
+	state->acquire_ctx = ctx;
 
 	ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI0);
 	KUNIT_ASSERT_EQ(test, ret, 0);
@@ -929,7 +928,7 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
 	state = drm_atomic_state_alloc(drm);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = &ctx;
+	state->acquire_ctx = ctx;
 
 	ret = vc4_mock_atomic_del_output(test, state, VC4_ENCODER_TYPE_HDMI0);
 	KUNIT_ASSERT_EQ(test, ret, 0);
@@ -954,14 +953,12 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
 	}
 
 	drm_atomic_state_put(state);
-	drm_modeset_drop_locks(&ctx);
-	drm_modeset_acquire_fini(&ctx);
 }
 
 static void
 drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct kunit *test)
 {
-	struct drm_modeset_acquire_ctx ctx;
+	struct drm_modeset_acquire_ctx *ctx;
 	struct drm_atomic_state *state;
 	struct vc4_crtc_state *new_vc4_crtc_state;
 	struct drm_device *drm;
@@ -971,13 +968,14 @@ drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct ku
 	vc4 = vc5_mock_device(test);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vc4);
 
-	drm_modeset_acquire_init(&ctx, 0);
+	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 
 	drm = &vc4->base;
 	state = drm_atomic_state_alloc(drm);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = &ctx;
+	state->acquire_ctx = ctx;
 
 	ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI0);
 	KUNIT_ASSERT_EQ(test, ret, 0);
@@ -993,7 +991,7 @@ drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct ku
 	state = drm_atomic_state_alloc(drm);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = &ctx;
+	state->acquire_ctx = ctx;
 
 	ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI1);
 	KUNIT_ASSERT_EQ(test, ret, 0);
@@ -1006,8 +1004,6 @@ drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct ku
 	KUNIT_EXPECT_NULL(test, new_vc4_crtc_state);
 
 	drm_atomic_state_put(state);
-	drm_modeset_drop_locks(&ctx);
-	drm_modeset_acquire_fini(&ctx);
 }
 
 static struct kunit_case vc5_pv_muxing_bugs_tests[] = {

-- 
2.41.0

[PATCH v2 10/11] drm/vc4: tests: Switch to atomic state allocation helper

[Maxime Ripard]

Now that we have a helper that takes care of an atomic state allocation
and cleanup, we can migrate to it to simplify our tests.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c | 55 ++++----------------------
 1 file changed, 8 insertions(+), 47 deletions(-)

diff --git a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
index ff1deaed0cab..5f9f5626329d 100644
--- a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
+++ b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
@@ -725,7 +725,6 @@ static int vc4_pv_muxing_test_init(struct kunit *test)
 {
 	const struct pv_muxing_param *params = test->param_value;
 	struct drm_modeset_acquire_ctx *ctx;
-	struct drm_atomic_state *state;
 	struct pv_muxing_priv *priv;
 	struct drm_device *drm;
 	struct vc4_dev *vc4;
@@ -742,24 +741,12 @@ static int vc4_pv_muxing_test_init(struct kunit *test)
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 
 	drm = &vc4->base;
-	state = drm_atomic_state_alloc(drm);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
-
-	state->acquire_ctx = ctx;
-
-	priv->state = state;
+	priv->state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->state);
 
 	return 0;
 }
 
-static void vc4_pv_muxing_test_exit(struct kunit *test)
-{
-	struct pv_muxing_priv *priv = test->priv;
-	struct drm_atomic_state *state = priv->state;
-
-	drm_atomic_state_put(state);
-}
-
 static struct kunit_case vc4_pv_muxing_tests[] = {
 	KUNIT_CASE_PARAM(drm_vc4_test_pv_muxing,
 			 vc4_test_pv_muxing_gen_params),
@@ -771,7 +758,6 @@ static struct kunit_case vc4_pv_muxing_tests[] = {
 static struct kunit_suite vc4_pv_muxing_test_suite = {
 	.name = "vc4-pv-muxing-combinations",
 	.init = vc4_pv_muxing_test_init,
-	.exit = vc4_pv_muxing_test_exit,
 	.test_cases = vc4_pv_muxing_tests,
 };
 
@@ -786,7 +772,6 @@ static struct kunit_case vc5_pv_muxing_tests[] = {
 static struct kunit_suite vc5_pv_muxing_test_suite = {
 	.name = "vc5-pv-muxing-combinations",
 	.init = vc4_pv_muxing_test_init,
-	.exit = vc4_pv_muxing_test_exit,
 	.test_cases = vc5_pv_muxing_tests,
 };
 
@@ -814,11 +799,9 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 
 	drm = &vc4->base;
-	state = drm_atomic_state_alloc(drm);
+	state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = ctx;
-
 	ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI0);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
@@ -839,13 +822,9 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes
 	ret = drm_atomic_helper_swap_state(state, false);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
-	drm_atomic_state_put(state);
-
-	state = drm_atomic_state_alloc(drm);
+	state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = ctx;
-
 	ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI1);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
@@ -864,8 +843,6 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes
 	KUNIT_ASSERT_TRUE(test, new_hvs_state->fifo_state[hdmi1_channel].in_use);
 
 	KUNIT_EXPECT_NE(test, hdmi0_channel, hdmi1_channel);
-
-	drm_atomic_state_put(state);
 }
 
 static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
@@ -887,11 +864,9 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 
 	drm = &vc4->base;
-	state = drm_atomic_state_alloc(drm);
+	state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = ctx;
-
 	ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI0);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
@@ -923,13 +898,9 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
 	ret = drm_atomic_helper_swap_state(state, false);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
-	drm_atomic_state_put(state);
-
-	state = drm_atomic_state_alloc(drm);
+	state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = ctx;
-
 	ret = vc4_mock_atomic_del_output(test, state, VC4_ENCODER_TYPE_HDMI0);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
@@ -951,8 +922,6 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
 
 		KUNIT_EXPECT_EQ(test, old_hdmi1_channel, hdmi1_channel);
 	}
-
-	drm_atomic_state_put(state);
 }
 
 static void
@@ -972,11 +941,9 @@ drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct ku
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 
 	drm = &vc4->base;
-	state = drm_atomic_state_alloc(drm);
+	state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = ctx;
-
 	ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI0);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
@@ -986,13 +953,9 @@ drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct ku
 	ret = drm_atomic_helper_swap_state(state, false);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
-	drm_atomic_state_put(state);
-
-	state = drm_atomic_state_alloc(drm);
+	state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
-	state->acquire_ctx = ctx;
-
 	ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI1);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
@@ -1002,8 +965,6 @@ drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct ku
 	new_vc4_crtc_state = get_vc4_crtc_state_for_encoder(test, state,
 							    VC4_ENCODER_TYPE_HDMI0);
 	KUNIT_EXPECT_NULL(test, new_vc4_crtc_state);
-
-	drm_atomic_state_put(state);
 }
 
 static struct kunit_case vc5_pv_muxing_bugs_tests[] = {

-- 
2.41.0

[PATCH v2 11/11] drm/vc4: tests: pv-muxing: Document test scenario

[Maxime Ripard]

We've had a couple of tests that weren't really obvious, nor did they
document what they were supposed to test. Document that to make it
hopefully more obvious.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
index 5f9f5626329d..61622e951031 100644
--- a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
+++ b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c
@@ -845,6 +845,13 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes
 	KUNIT_EXPECT_NE(test, hdmi0_channel, hdmi1_channel);
 }
 
+/*
+ * This test makes sure that we never change the FIFO of an active HVS
+ * channel if we disable a FIFO with a lower index.
+ *
+ * Doing so would result in a FIFO stall and would disrupt an output
+ * supposed to be unaffected by the commit.
+ */
 static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
 {
 	struct drm_modeset_acquire_ctx *ctx;
@@ -924,6 +931,21 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test)
 	}
 }
 
+/*
+ * Test that if we affect a single output, only the CRTC state of that
+ * output will be pulled in the global atomic state.
+ *
+ * This is relevant for two things:
+ *
+ *   - If we don't have that state at all, we are unlikely to affect the
+ *     FIFO muxing. This is somewhat redundant with
+ *     drm_test_vc5_pv_muxing_bugs_stable_fifo()
+ *
+ *   - KMS waits for page flips to occur on all the CRTC found in the
+ *     CRTC state. Since the CRTC is unaffected, we would over-wait, but
+ *     most importantly run into corner cases like waiting on an
+ *     inactive CRTC that never completes.
+ */
 static void
 drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct kunit *test)
 {

-- 
2.41.0

Re: [PATCH v2 00/11] drm: kunit: Switch to kunit actions

[Maira Canal]

Hi Maxime,

On 7/20/23 08:15, Maxime Ripard wrote:
> Hi,
> 
> Since v6.5-rc1, kunit gained a devm/drmm-like mechanism that makes tests
> resources much easier to cleanup.
> 
> This series converts the existing tests to use those new actions where
> relevant.
> > Let me know what you think,

With the problems pointed out by kernel test bot fixed, the whole
series is:

Reviewed-by: Maíra Canal <mairacanal@riseup.net>

Best Regards,
- Maíra

> Maxime
> 
> Signed-off-by: Maxime Ripard <mripard@kernel.org>
> ---
> Changes in v2:
> - Fix some typos
> - Use plaltform_device_del instead of removing the call to
>    platform_device_put after calling platform_device_add
> - Link to v1: https://lore.kernel.org/r/20230710-kms-kunit-actions-rework-v1-0-722c58d72c72@kernel.org
> 
> ---
> Maxime Ripard (11):
>        drm/tests: helpers: Switch to kunit actions
>        drm/tests: client-modeset: Remove call to drm_kunit_helper_free_device()
>        drm/tests: modes: Remove call to drm_kunit_helper_free_device()
>        drm/tests: probe-helper: Remove call to drm_kunit_helper_free_device()
>        drm/tests: helpers: Create a helper to allocate a locking ctx
>        drm/tests: helpers: Create a helper to allocate an atomic state
>        drm/vc4: tests: pv-muxing: Remove call to drm_kunit_helper_free_device()
>        drm/vc4: tests: mock: Use a kunit action to unregister DRM device
>        drm/vc4: tests: pv-muxing: Switch to managed locking init
>        drm/vc4: tests: Switch to atomic state allocation helper
>        drm/vc4: tests: pv-muxing: Document test scenario
> 
>   drivers/gpu/drm/tests/drm_client_modeset_test.c |   8 --
>   drivers/gpu/drm/tests/drm_kunit_helpers.c       | 108 +++++++++++++++++++++-
>   drivers/gpu/drm/tests/drm_modes_test.c          |   8 --
>   drivers/gpu/drm/tests/drm_probe_helper_test.c   |   8 --
>   drivers/gpu/drm/vc4/tests/vc4_mock.c            |   5 ++
>   drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c  | 115 +++++++++---------------
>   include/drm/drm_kunit_helpers.h                 |   7 ++
>   7 files changed, 158 insertions(+), 101 deletions(-)
> ---
> base-commit: c58c49dd89324b18a812762a2bfa5a0458e4f252
> change-id: 20230710-kms-kunit-actions-rework-5d163762c93b
> 
> Best regards,

Re: [PATCH v2 00/11] drm: kunit: Switch to kunit actions

[Maxime Ripard]

On Thu, 20 Jul 2023 13:15:45 +0200, Maxime Ripard wrote:
> Since v6.5-rc1, kunit gained a devm/drmm-like mechanism that makes tests
> resources much easier to cleanup.
> 
> This series converts the existing tests to use those new actions where
> relevant.
> 
> Let me know what you think,
> Maxime
> 
> [...]

Applied to drm/drm-misc (drm-misc-next).

Thanks!
Maxime