Re: [DPU PATCH v2] drm/msm: Use atomic private_obj instead of subclassing

Jeykumar Sankaran <jsanka@xxxxxxxxxxxxxx> · Mon, 19 Mar 2018 12:33:41 -0700

On 2018-03-19 10:31, Sean Paul wrote:
Instead of subclassing atomic state, store driver private data in
private_obj/state. This allows us to remove the swap_state driver hook
for mdp5 and get closer to using the atomic helpers entirely.

Changes in v2:
 - Use state->state in disp duplicate_state callback (Jeykumar)

Cc: Jeykumar Sankaran <jsanka@xxxxxxxxxxxxxx>
Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
With the below comment updated

Reviewed-by: Jeykumar Sankaran <jsanka@xxxxxxxxxxxxxx>

---
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 37 ++++++--------
 drivers/gpu/drm/msm/msm_atomic.c         | 30 -----------
 drivers/gpu/drm/msm/msm_drv.c            | 65 ++++++++++++++++++++++--
 drivers/gpu/drm/msm/msm_drv.h            |  4 +-
 drivers/gpu/drm/msm/msm_kms.h            | 28 +++++-----
 5 files changed, 95 insertions(+), 69 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
index 6d8e3a9a6fc0..f1a248419655 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -74,36 +74,32 @@ struct mdp5_state *mdp5_get_state(struct
drm_atomic_state *s)
 {
 	struct msm_drm_private *priv = s->dev->dev_private;
 	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
-	struct msm_kms_state *state = to_kms_state(s);
-	struct mdp5_state *new_state;
+	struct msm_kms_state *kms_state;
 	int ret;

-	if (state->state)
-		return state->state;
-
 	ret = drm_modeset_lock(&mdp5_kms->state_lock, s->acquire_ctx);
 	if (ret)
 		return ERR_PTR(ret);

-	new_state = kmalloc(sizeof(*mdp5_kms->state), GFP_KERNEL);
-	if (!new_state)
-		return ERR_PTR(-ENOMEM);
+	kms_state = msm_kms_get_state(s);
+	if (IS_ERR_OR_NULL(kms_state))
+		return (struct mdp5_state *)kms_state; /* casting ERR_PTR
*/

-	/* Copy state: */
-	new_state->hwpipe = mdp5_kms->state->hwpipe;
-	new_state->hwmixer = mdp5_kms->state->hwmixer;
-	if (mdp5_kms->smp)
-		new_state->smp = mdp5_kms->state->smp;
+	return kms_state->state;
+}

-	state->state = new_state;
+static void *mdp5_duplicate_state(void *state)
+{
+	if (!state)
+		return kzalloc(sizeof(struct mdp5_state), GFP_KERNEL);

-	return new_state;
+	return kmemdup(state, sizeof(struct mdp5_state), GFP_KERNEL);
 }

-static void mdp5_swap_state(struct msm_kms *kms, struct 
drm_atomic_state
*state)
+static void mdp5_destroy_state(void *state)
 {
-	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
-	swap(to_kms_state(state)->state, mdp5_kms->state);
+	struct mdp5_state *mdp_state = state;
+	kfree(mdp_state);
 }

 static void mdp5_prepare_commit(struct msm_kms *kms, struct
drm_atomic_state *state)
@@ -229,7 +225,8 @@ static const struct mdp_kms_funcs kms_funcs = {
 		.irq             = mdp5_irq,
 		.enable_vblank   = mdp5_enable_vblank,
 		.disable_vblank  = mdp5_disable_vblank,
-		.swap_state      = mdp5_swap_state,
+		.duplicate_state = mdp5_duplicate_state,
+		.destroy_state	 = mdp5_destroy_state,
 		.prepare_commit  = mdp5_prepare_commit,
 		.complete_commit = mdp5_complete_commit,
 		.wait_for_crtc_commit_done =
mdp5_wait_for_crtc_commit_done,
@@ -726,8 +723,6 @@ static void mdp5_destroy(struct platform_device 
*pdev)

 	if (mdp5_kms->rpm_enabled)
 		pm_runtime_disable(&pdev->dev);
-
-	kfree(mdp5_kms->state);
 }

 static int construct_pipes(struct mdp5_kms *mdp5_kms, int cnt,
diff --git a/drivers/gpu/drm/msm/msm_atomic.c
b/drivers/gpu/drm/msm/msm_atomic.c
index 7e54eb65d096..1f53262ea46b 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -169,9 +169,6 @@ int msm_atomic_commit(struct drm_device *dev,
 	 */
 	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);

-	if (to_kms_state(state)->state)
-		priv->kms->funcs->swap_state(priv->kms, state);
-
 	/*
 	 * Provide the driver a chance to prepare for output fences. This
is
 	 * done after the point of no return, but before asynchronous
commits
@@ -210,30 +207,3 @@ int msm_atomic_commit(struct drm_device *dev,
 	drm_atomic_helper_cleanup_planes(dev, state);
 	return ret;
 }
-
-struct drm_atomic_state *msm_atomic_state_alloc(struct drm_device 
*dev)
-{
-	struct msm_kms_state *state = kzalloc(sizeof(*state), GFP_KERNEL);
-
-	if (!state || drm_atomic_state_init(dev, &state->base) < 0) {
-		kfree(state);
-		return NULL;
-	}
-
-	return &state->base;
-}
-
-void msm_atomic_state_clear(struct drm_atomic_state *s)
-{
-	struct msm_kms_state *state = to_kms_state(s);
-	drm_atomic_state_default_clear(&state->base);
-	kfree(state->state);
-	state->state = NULL;
-}
-
-void msm_atomic_state_free(struct drm_atomic_state *state)
-{
-	kfree(to_kms_state(state)->state);
-	drm_atomic_state_default_release(state);
-	kfree(state);
-}
diff --git a/drivers/gpu/drm/msm/msm_drv.c 
b/drivers/gpu/drm/msm/msm_drv.c
index 5219792e93bc..4c0740dc7854 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -121,9 +121,62 @@ static const struct drm_mode_config_funcs
mode_config_funcs = {
 	.output_poll_changed = msm_fb_output_poll_changed,
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = msm_atomic_commit,
-	.atomic_state_alloc = msm_atomic_state_alloc,
-	.atomic_state_clear = msm_atomic_state_clear,
-	.atomic_state_free = msm_atomic_state_free,
+};
+
+static inline
+struct msm_kms *obj_to_kms(struct drm_private_obj *obj)
+{
+	return container_of(obj, struct msm_kms, base);
+}
+
+static inline
+struct msm_kms_state *state_to_kms_state(struct drm_private_state 
*state)
+{
+	return container_of(state, struct msm_kms_state, base);
+}
+
+struct msm_kms_state *msm_kms_get_state(struct drm_atomic_state *s)
+{
+	struct msm_drm_private *priv = s->dev->dev_private;
+	struct drm_private_obj *obj = &priv->kms->base;
+	struct drm_private_state *state;
+
+	state = drm_atomic_get_private_obj_state(s, obj);
+	if (IS_ERR_OR_NULL(state))
+		return (struct msm_kms_state *)state; /* casting ERR_PTR
*/
+
+	return state_to_kms_state(state);
+}
+
+static struct drm_private_state *
+msm_kms_duplicate_state(struct drm_private_obj *obj)
+{
+	struct msm_kms *kms = obj_to_kms(obj);
+	struct msm_kms_state *state = state_to_kms_state(obj->state);
+	struct msm_kms_state *new_state;
+
+	if (kms->funcs->duplicate_state)
+		new_state = kms->funcs->duplicate_state(state->state);
+
+	__drm_atomic_helper_private_obj_duplicate_state(obj,
&new_state->base);
+
+	return &new_state->base;
+}
+
+static void msm_kms_destroy_state(struct drm_private_obj *obj,
+				  struct drm_private_state *state)
+{
+	struct msm_kms *kms = obj_to_kms(obj);
+	struct msm_kms_state *kms_state = state_to_kms_state(obj->state);
+
+	if (kms->funcs->destroy_state)
+		kms->funcs->destroy_state(kms_state->state);
+	kfree(kms_state);
+}
+
+static const struct drm_private_state_funcs kms_state_funcs = {
+	.atomic_duplicate_state = msm_kms_duplicate_state,
+	.atomic_destroy_state = msm_kms_destroy_state,
 };

 #ifdef CONFIG_DRM_MSM_REGISTER_LOGGING
@@ -341,6 +394,8 @@ static int msm_drm_uninit(struct device *dev)
 		}
 	}

+	drm_atomic_private_obj_fini(&kms->base);
+
 	msm_gem_shrinker_cleanup(ddev);

 	drm_kms_helper_poll_fini(ddev);
@@ -770,6 +825,10 @@ static int msm_drm_init(struct device *dev, struct
drm_driver *drv)
 	}
 #endif

+	drm_atomic_private_obj_init(&kms->base,
+				    &kms->state.base,
+				    &kms_state_funcs);
+
 	/* perform subdriver post initialization */
 	if (kms && kms->funcs && kms->funcs->postinit) {
 		ret = kms->funcs->postinit(kms);
diff --git a/drivers/gpu/drm/msm/msm_drv.h 
b/drivers/gpu/drm/msm/msm_drv.h
index 292496b682e8..8cab333df717 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -598,9 +598,7 @@ struct msm_format {

 int msm_atomic_commit(struct drm_device *dev,
 		struct drm_atomic_state *state, bool nonblock);
-struct drm_atomic_state *msm_atomic_state_alloc(struct drm_device 
*dev);
-void msm_atomic_state_clear(struct drm_atomic_state *state);
-void msm_atomic_state_free(struct drm_atomic_state *state);
+struct msm_kms_state *msm_kms_get_state(struct drm_atomic_state 
*state);

 void msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
 		struct msm_gem_vma *vma, struct sg_table *sgt);
diff --git a/drivers/gpu/drm/msm/msm_kms.h 
b/drivers/gpu/drm/msm/msm_kms.h
index 09ba1e79db50..4c5a69258c42 100644
--- a/drivers/gpu/drm/msm/msm_kms.h
+++ b/drivers/gpu/drm/msm/msm_kms.h
@@ -57,6 +57,8 @@ struct msm_kms_funcs {
 	void (*disable_vblank)(struct msm_kms *kms, struct drm_crtc
*crtc);
 	/* swap global atomic state: */
 	void (*swap_state)(struct msm_kms *kms, struct drm_atomic_state
*state);
+	void *(*duplicate_state)(void *state);
+	void (*destroy_state)(void *state);
 	/* modeset, bracketing atomic_commit(): */
 	void (*prepare_fence)(struct msm_kms *kms,
 			struct drm_atomic_state *state);
@@ -114,16 +116,6 @@ struct msm_kms_funcs {
 #endif
 };

-struct msm_kms {
-	const struct msm_kms_funcs *funcs;
-
-	/* irq number to be passed on to drm_irq_install */
-	int irq;
-
-	/* mapper-id used to request GEM buffer mapped for scanout: */
-	struct msm_gem_address_space *aspace;
-};
-
 /**
  * Subclass of drm_atomic_state, to allow kms backend to have driver
  * private global state.  The kms backend can do whatever it wants
Update comments. It is not subclassing drm_atomic_state anymore.
@@ -131,10 +123,22 @@ struct msm_kms {
  * is kfree'd and set back to NULL.
  */
 struct msm_kms_state {
-	struct drm_atomic_state base;
+	struct drm_private_state base;
 	void *state;
 };
-#define to_kms_state(x) container_of(x, struct msm_kms_state, base)
+
+struct msm_kms {
+	struct drm_private_obj base;
+	struct msm_kms_state state;
+
+	const struct msm_kms_funcs *funcs;
+
+	/* irq number to be passed on to drm_irq_install */
+	int irq;
+
+	/* mapper-id used to request GEM buffer mapped for scanout: */
+	struct msm_gem_address_space *aspace;
+};

 static inline void msm_kms_init(struct msm_kms *kms,
 		const struct msm_kms_funcs *funcs)

--
Jeykumar S
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