[PATCH v2 1/6] drm/msm: Use drm_private_obj/state instead of subclassing

[PATCH v2 1/6] drm/msm: Use drm_private_obj/state instead of subclassing

[Sean Paul]

Now that we have private state handled by the core, we can use those
instead of rolling our own swap_state for private data.

Originally posted here: https://patchwork.freedesktop.org/patch/211361/

Changes in v2:
 - Use state->state in disp duplicate_state callback (Jeykumar)
Changes in v3:
 - Update comment describing msm_kms_state (Jeykumar)
Changes in v4:
 - Rebased on msm-next
 - Don't always use private state from atomic state (Archit)
 - Renamed some of the state accessors
 - Tested on mdp5 db410c
Changes in v5:
 - None

Cc: Jeykumar Sankaran <jsanka@codeaurora.org>
Cc: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c   | 77 ++++++++++---------
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h   | 11 +--
 drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.c | 12 ++-
 drivers/gpu/drm/msm/disp/mdp5/mdp5_pipe.c  | 28 ++++---
 drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c   | 19 +++--
 drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h   |  4 +-
 drivers/gpu/drm/msm/msm_atomic.c           | 37 ---------
 drivers/gpu/drm/msm/msm_drv.c              | 87 +++++++++++++++++++++-
 drivers/gpu/drm/msm/msm_drv.h              |  3 -
 drivers/gpu/drm/msm/msm_kms.h              | 21 ++++--
 10 files changed, 183 insertions(+), 116 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..366670043190 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -70,60 +70,62 @@ static int mdp5_hw_init(struct msm_kms *kms)
 	return 0;
 }
 
-struct mdp5_state *mdp5_get_state(struct drm_atomic_state *s)
+struct mdp5_state *mdp5_state_from_atomic(struct drm_atomic_state *state)
 {
-	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;
-	int ret;
+	struct msm_kms_state *kms_state = msm_kms_state_from_atomic(state);
 
-	if (state->state)
-		return state->state;
+	if (IS_ERR_OR_NULL(kms_state))
+		return (struct mdp5_state *)kms_state; /* casting ERR_PTR */
 
-	ret = drm_modeset_lock(&mdp5_kms->state_lock, s->acquire_ctx);
-	if (ret)
-		return ERR_PTR(ret);
+	return kms_state->state;
+}
 
-	new_state = kmalloc(sizeof(*mdp5_kms->state), GFP_KERNEL);
-	if (!new_state)
-		return ERR_PTR(-ENOMEM);
+struct mdp5_state *mdp5_state_from_dev(struct drm_device *dev)
+{
+	struct msm_kms_state *kms_state = msm_kms_state_from_dev(dev);
 
-	/* 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;
+	if (IS_ERR_OR_NULL(kms_state))
+		return (struct mdp5_state *)kms_state; /* casting ERR_PTR */
 
-	state->state = new_state;
+	return kms_state->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 = (struct mdp5_state *)state;
+	kfree(mdp_state);
 }
 
-static void mdp5_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *state)
+static void mdp5_prepare_commit(struct msm_kms *kms,
+				struct drm_atomic_state *old_state)
 {
 	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
+	struct mdp5_state *mdp5_state = mdp5_state_from_dev(mdp5_kms->dev);
 	struct device *dev = &mdp5_kms->pdev->dev;
 
 	pm_runtime_get_sync(dev);
 
 	if (mdp5_kms->smp)
-		mdp5_smp_prepare_commit(mdp5_kms->smp, &mdp5_kms->state->smp);
+		mdp5_smp_prepare_commit(mdp5_kms->smp, &mdp5_state->smp);
 }
 
-static void mdp5_complete_commit(struct msm_kms *kms, struct drm_atomic_state *state)
+static void mdp5_complete_commit(struct msm_kms *kms,
+				 struct drm_atomic_state *old_state)
 {
 	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
+	struct mdp5_state *mdp5_state = mdp5_state_from_dev(mdp5_kms->dev);
 	struct device *dev = &mdp5_kms->pdev->dev;
 
 	if (mdp5_kms->smp)
-		mdp5_smp_complete_commit(mdp5_kms->smp, &mdp5_kms->state->smp);
+		mdp5_smp_complete_commit(mdp5_kms->smp, &mdp5_state->smp);
 
 	pm_runtime_put_sync(dev);
 }
@@ -229,7 +231,8 @@ 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 +729,6 @@ 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,
@@ -859,7 +860,8 @@ static int interface_init(struct mdp5_kms *mdp5_kms)
 	return 0;
 }
 
-static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
+static int mdp5_init(struct platform_device *pdev, struct drm_device *dev,
+		     struct msm_kms_state *initial_state)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct mdp5_kms *mdp5_kms;
@@ -880,9 +882,8 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
 	mdp5_kms->dev = dev;
 	mdp5_kms->pdev = pdev;
 
-	drm_modeset_lock_init(&mdp5_kms->state_lock);
-	mdp5_kms->state = kzalloc(sizeof(*mdp5_kms->state), GFP_KERNEL);
-	if (!mdp5_kms->state) {
+	initial_state->state = mdp5_duplicate_state(NULL);
+	if (!initial_state->state) {
 		ret = -ENOMEM;
 		goto fail;
 	}
@@ -940,7 +941,8 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
 	 * this section initializes the SMP:
 	 */
 	if (mdp5_kms->caps & MDP_CAP_SMP) {
-		mdp5_kms->smp = mdp5_smp_init(mdp5_kms, &config->hw->smp);
+		mdp5_kms->smp = mdp5_smp_init(mdp5_kms, &config->hw->smp,
+					      initial_state->state);
 		if (IS_ERR(mdp5_kms->smp)) {
 			ret = PTR_ERR(mdp5_kms->smp);
 			mdp5_kms->smp = NULL;
@@ -980,10 +982,11 @@ static int mdp5_bind(struct device *dev, struct device *master, void *data)
 {
 	struct drm_device *ddev = dev_get_drvdata(master);
 	struct platform_device *pdev = to_platform_device(dev);
+	struct msm_kms_state *initial_state = (struct msm_kms_state *)data;
 
 	DBG("");
 
-	return mdp5_init(pdev, ddev);
+	return mdp5_init(pdev, ddev, initial_state);
 }
 
 static void mdp5_unbind(struct device *dev, struct device *master,
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h
index 425a03d213e5..e23117b82aad 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h
@@ -28,8 +28,6 @@
 #include "mdp5_ctl.h"
 #include "mdp5_smp.h"
 
-struct mdp5_state;
-
 struct mdp5_kms {
 	struct mdp_kms base;
 
@@ -49,12 +47,6 @@ struct mdp5_kms {
 	struct mdp5_cfg_handler *cfg;
 	uint32_t caps;	/* MDP capabilities (MDP_CAP_XXX bits) */
 
-	/**
-	 * Global atomic state.  Do not access directly, use mdp5_get_state()
-	 */
-	struct mdp5_state *state;
-	struct drm_modeset_lock state_lock;
-
 	struct mdp5_smp *smp;
 	struct mdp5_ctl_manager *ctlm;
 
@@ -93,7 +85,8 @@ struct mdp5_state {
 };
 
 struct mdp5_state *__must_check
-mdp5_get_state(struct drm_atomic_state *s);
+mdp5_state_from_atomic(struct drm_atomic_state *s);
+struct mdp5_state *__must_check mdp5_state_from_dev(struct drm_device *dev);
 
 /* Atomic plane state.  Subclasses the base drm_plane_state in order to
  * track assigned hwpipe and hw specific state.
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.c
index 8a00991f03c7..fdd5e12a9d56 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.c
@@ -52,10 +52,11 @@ int mdp5_mixer_assign(struct drm_atomic_state *s, struct drm_crtc *crtc,
 {
 	struct msm_drm_private *priv = s->dev->dev_private;
 	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
-	struct mdp5_state *state = mdp5_get_state(s);
+	struct mdp5_state *state;
 	struct mdp5_hw_mixer_state *new_state;
 	int i;
 
+	state = mdp5_state_from_atomic(s);
 	if (IS_ERR(state))
 		return PTR_ERR(state);
 
@@ -129,12 +130,17 @@ int mdp5_mixer_assign(struct drm_atomic_state *s, struct drm_crtc *crtc,
 
 void mdp5_mixer_release(struct drm_atomic_state *s, struct mdp5_hw_mixer *mixer)
 {
-	struct mdp5_state *state = mdp5_get_state(s);
-	struct mdp5_hw_mixer_state *new_state = &state->hwmixer;
+	struct mdp5_state *state;
+	struct mdp5_hw_mixer_state *new_state;
 
 	if (!mixer)
 		return;
 
+	state = mdp5_state_from_atomic(s);
+	if (IS_ERR(state))
+		return;
+
+	new_state = &state->hwmixer;
 	if (WARN_ON(!new_state->hwmixer_to_crtc[mixer->idx]))
 		return;
 
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_pipe.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_pipe.c
index ff52c49095f9..dc66ab9fdd50 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_pipe.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_pipe.c
@@ -24,17 +24,20 @@ int mdp5_pipe_assign(struct drm_atomic_state *s, struct drm_plane *plane,
 {
 	struct msm_drm_private *priv = s->dev->dev_private;
 	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
-	struct mdp5_state *state;
+	struct mdp5_state *old_mdp5_state, *new_mdp5_state;
 	struct mdp5_hw_pipe_state *old_state, *new_state;
 	int i, j;
 
-	state = mdp5_get_state(s);
-	if (IS_ERR(state))
-		return PTR_ERR(state);
+	new_mdp5_state = mdp5_state_from_atomic(s);
+	if (IS_ERR(new_mdp5_state))
+		return PTR_ERR(new_mdp5_state);
 
-	/* grab old_state after mdp5_get_state(), since now we hold lock: */
-	old_state = &mdp5_kms->state->hwpipe;
-	new_state = &state->hwpipe;
+	old_mdp5_state = mdp5_state_from_dev(s->dev);
+	if (IS_ERR(old_mdp5_state))
+		return PTR_ERR(old_mdp5_state);
+
+	old_state = &old_mdp5_state->hwpipe;
+	new_state = &new_mdp5_state->hwpipe;
 
 	for (i = 0; i < mdp5_kms->num_hwpipes; i++) {
 		struct mdp5_hw_pipe *cur = mdp5_kms->hwpipes[i];
@@ -107,7 +110,7 @@ int mdp5_pipe_assign(struct drm_atomic_state *s, struct drm_plane *plane,
 		WARN_ON(r_hwpipe);
 
 		DBG("%s: alloc SMP blocks", (*hwpipe)->name);
-		ret = mdp5_smp_assign(mdp5_kms->smp, &state->smp,
+		ret = mdp5_smp_assign(mdp5_kms->smp, &new_mdp5_state->smp,
 				(*hwpipe)->pipe, blkcfg);
 		if (ret)
 			return -ENOMEM;
@@ -132,12 +135,17 @@ void mdp5_pipe_release(struct drm_atomic_state *s, struct mdp5_hw_pipe *hwpipe)
 {
 	struct msm_drm_private *priv = s->dev->dev_private;
 	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
-	struct mdp5_state *state = mdp5_get_state(s);
-	struct mdp5_hw_pipe_state *new_state = &state->hwpipe;
+	struct mdp5_state *state;
+	struct mdp5_hw_pipe_state *new_state;
 
 	if (!hwpipe)
 		return;
 
+	state = mdp5_state_from_atomic(s);
+	if (IS_ERR(state))
+		return;
+
+	new_state = &state->hwpipe;
 	if (WARN_ON(!new_state->hwpipe_to_plane[hwpipe->idx]))
 		return;
 
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
index ae4983d9d0a5..918e4123e781 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
@@ -338,6 +338,7 @@ void mdp5_smp_complete_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state
 void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p)
 {
 	struct mdp5_kms *mdp5_kms = get_kms(smp);
+	struct mdp5_state *mdp5_state;
 	struct mdp5_hw_pipe_state *hwpstate;
 	struct mdp5_smp_state *state;
 	int total = 0, i, j;
@@ -346,11 +347,12 @@ void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p)
 	drm_printf(p, "----\t-----\t-----\n");
 
 	if (drm_can_sleep())
-		drm_modeset_lock(&mdp5_kms->state_lock, NULL);
+		drm_modeset_lock_all(mdp5_kms->dev);
 
-	/* grab these *after* we hold the state_lock */
-	hwpstate = &mdp5_kms->state->hwpipe;
-	state = &mdp5_kms->state->smp;
+	/* grab these *after* we hold the modeset_lock */
+	mdp5_state = mdp5_state_from_dev(mdp5_kms->dev);
+	hwpstate = &mdp5_state->hwpipe;
+	state = &mdp5_state->smp;
 
 	for (i = 0; i < mdp5_kms->num_hwpipes; i++) {
 		struct mdp5_hw_pipe *hwpipe = mdp5_kms->hwpipes[i];
@@ -374,7 +376,7 @@ void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p)
 			bitmap_weight(state->state, smp->blk_cnt));
 
 	if (drm_can_sleep())
-		drm_modeset_unlock(&mdp5_kms->state_lock);
+		drm_modeset_unlock_all(mdp5_kms->dev);
 }
 
 void mdp5_smp_destroy(struct mdp5_smp *smp)
@@ -382,12 +384,15 @@ void mdp5_smp_destroy(struct mdp5_smp *smp)
 	kfree(smp);
 }
 
-struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms, const struct mdp5_smp_block *cfg)
+struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms,
+			       const struct mdp5_smp_block *cfg,
+			       struct mdp5_state *mdp5_state)
 {
-	struct mdp5_smp_state *state = &mdp5_kms->state->smp;
+	struct mdp5_smp_state *state;
 	struct mdp5_smp *smp = NULL;
 	int ret;
 
+	state = &mdp5_state->smp;
 	smp = kzalloc(sizeof(*smp), GFP_KERNEL);
 	if (unlikely(!smp)) {
 		ret = -ENOMEM;
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h
index b41d0448fbe8..1bfa22b63a2d 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h
@@ -69,6 +69,7 @@ struct mdp5_smp_state {
 };
 
 struct mdp5_kms;
+struct mdp5_state;
 struct mdp5_smp;
 
 /*
@@ -78,7 +79,8 @@ struct mdp5_smp;
  */
 
 struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms,
-		const struct mdp5_smp_block *cfg);
+		const struct mdp5_smp_block *cfg,
+		struct mdp5_state *mdp5_state);
 void  mdp5_smp_destroy(struct mdp5_smp *smp);
 
 void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p);
diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index bf5f8c39f34d..e792158676aa 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -220,16 +220,6 @@ int msm_atomic_commit(struct drm_device *dev,
 
 	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
 
-	/*
-	 * This is the point of no return - everything below never fails except
-	 * when the hw goes bonghits. Which means we can commit the new state on
-	 * the software side now.
-	 *
-	 * swap driver private state while still holding state_lock
-	 */
-	if (to_kms_state(state)->state)
-		priv->kms->funcs->swap_state(priv->kms, state);
-
 	/*
 	 * Everything below can be run asynchronously without the need to grab
 	 * any modeset locks at all under one conditions: It must be guaranteed
@@ -262,30 +252,3 @@ 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 30cd514d8f7c..7e8f640062ef 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -42,11 +42,79 @@ static const struct drm_mode_config_funcs mode_config_funcs = {
 	.output_poll_changed = drm_fb_helper_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 *msm_kms_from_obj(struct drm_private_obj *obj)
+{
+	return container_of(obj, struct msm_kms, base);
+}
+
+static inline
+struct msm_kms_state *msm_kms_state_from_priv(struct drm_private_state *priv)
+{
+	return container_of(priv, struct msm_kms_state, base);
+}
+
+
+struct msm_kms_state *msm_kms_state_from_atomic(struct drm_atomic_state *state)
+{
+	struct msm_drm_private *priv = state->dev->dev_private;
+	struct drm_private_obj *obj = &priv->kms->base;
+	struct drm_private_state *priv_state;
+
+	priv_state = drm_atomic_get_private_obj_state(state, obj);
+	if (IS_ERR_OR_NULL(priv_state))
+		return (struct msm_kms_state *)state; /* casting ERR_PTR */
+
+	return msm_kms_state_from_priv(priv_state);
+}
+
+struct msm_kms_state *msm_kms_state_from_dev(struct drm_device *dev)
+{
+	struct msm_drm_private *priv = dev->dev_private;
+	struct drm_private_obj *obj = &priv->kms->base;
+	struct drm_private_state *priv_state = obj->state;
+
+	return msm_kms_state_from_priv(priv_state);
+}
+
+static struct drm_private_state *
+msm_kms_duplicate_state(struct drm_private_obj *obj)
+{
+	struct msm_kms *kms = msm_kms_from_obj(obj);
+	struct msm_kms_state *state = msm_kms_state_from_priv(obj->state);
+	struct msm_kms_state *new_state;
+
+	new_state = kzalloc(sizeof(*new_state), GFP_KERNEL);
+	if (!new_state)
+		return NULL;
+
+	if (kms->funcs->duplicate_state)
+		new_state->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 *priv_state)
+{
+	struct msm_kms *kms = msm_kms_from_obj(obj);
+	struct msm_kms_state *state = msm_kms_state_from_priv(priv_state);
+
+	if (kms->funcs->destroy_state)
+		kms->funcs->destroy_state(state->state);
+	kfree(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
 static bool reglog = false;
 MODULE_PARM_DESC(reglog, "Enable register read/write logging");
@@ -245,6 +313,8 @@ static int msm_drm_uninit(struct device *dev)
 	flush_workqueue(priv->atomic_wq);
 	destroy_workqueue(priv->atomic_wq);
 
+	drm_atomic_private_obj_fini(&kms->base);
+
 	if (kms && kms->funcs)
 		kms->funcs->destroy(kms);
 
@@ -356,6 +426,7 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 	struct drm_device *ddev;
 	struct msm_drm_private *priv;
 	struct msm_kms *kms;
+	struct msm_kms_state *initial_state;
 	int ret;
 
 	ddev = drm_dev_alloc(drv, dev);
@@ -364,6 +435,10 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 		return PTR_ERR(ddev);
 	}
 
+	initial_state = kzalloc(sizeof(*initial_state), GFP_KERNEL);
+	if (!initial_state)
+		return -ENOMEM;
+
 	platform_set_drvdata(pdev, ddev);
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
@@ -394,7 +469,7 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 	drm_mode_config_init(ddev);
 
 	/* Bind all our sub-components: */
-	ret = component_bind_all(dev, ddev);
+	ret = component_bind_all(dev, initial_state);
 	if (ret) {
 		msm_mdss_destroy(ddev);
 		kfree(priv);
@@ -433,6 +508,10 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 		goto fail;
 	}
 
+	drm_atomic_private_obj_init(&kms->base,
+				    &initial_state->base,
+				    &kms_state_funcs);
+
 	if (kms) {
 		ret = kms->funcs->hw_init(kms);
 		if (ret) {
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 48ed5b9a8580..c5b8c989b859 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -162,9 +162,6 @@ 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);
 
 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 17d5824417ad..24d09fcebf16 100644
--- a/drivers/gpu/drm/msm/msm_kms.h
+++ b/drivers/gpu/drm/msm/msm_kms.h
@@ -42,6 +42,8 @@ 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_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
 	void (*complete_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
@@ -68,6 +70,8 @@ struct msm_kms_funcs {
 };
 
 struct msm_kms {
+	struct drm_private_obj base;
+
 	const struct msm_kms_funcs *funcs;
 
 	/* irq number to be passed on to drm_irq_install */
@@ -78,16 +82,23 @@ struct msm_kms {
 };
 
 /**
- * Subclass of drm_atomic_state, to allow kms backend to have driver
+ * Subclass of drm_private_state, to allow kms backend to have driver
  * private global state.  The kms backend can do whatever it wants
- * with the ->state ptr.  On ->atomic_state_clear() the ->state ptr
- * is kfree'd and set back to NULL.
+ * with the ->state ptr.
  */
 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)
+
+/**
+ * Extracts the msm_kms_state from either an atomic state, or the current
+ * device. One or the other might be desirable depending on whether you want the
+ * currently configured msm_kms_state (from_dev), or you would like the state
+ * which is about to be applied (from_atomic).
+ */
+struct msm_kms_state *msm_kms_state_from_dev(struct drm_device *dev);
+struct msm_kms_state *msm_kms_state_from_atomic(struct drm_atomic_state *state);
 
 static inline void msm_kms_init(struct msm_kms *kms,
 		const struct msm_kms_funcs *funcs)
-- 
Sean Paul, Software Engineer, Google / Chromium OS

Re: [PATCH v2 1/6] drm/msm: Use drm_private_obj/state instead of subclassing

[Archit Taneja]

On Thursday 29 March 2018 12:36 AM, Sean Paul wrote:
> Now that we have private state handled by the core, we can use those
> instead of rolling our own swap_state for private data.
> 
> Originally posted here: https://patchwork.freedesktop.org/patch/211361/
> 
> Changes in v2:
>   - Use state->state in disp duplicate_state callback (Jeykumar)
> Changes in v3:
>   - Update comment describing msm_kms_state (Jeykumar)
> Changes in v4:
>   - Rebased on msm-next
>   - Don't always use private state from atomic state (Archit)
>   - Renamed some of the state accessors
>   - Tested on mdp5 db410c
> Changes in v5:
>   - None
> 
> Cc: Jeykumar Sankaran <jsanka@codeaurora.org>
> Cc: Archit Taneja <architt@codeaurora.org>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> ---
>   drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c   | 77 ++++++++++---------
>   drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h   | 11 +--
>   drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.c | 12 ++-
>   drivers/gpu/drm/msm/disp/mdp5/mdp5_pipe.c  | 28 ++++---
>   drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c   | 19 +++--
>   drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h   |  4 +-
>   drivers/gpu/drm/msm/msm_atomic.c           | 37 ---------
>   drivers/gpu/drm/msm/msm_drv.c              | 87 +++++++++++++++++++++-
>   drivers/gpu/drm/msm/msm_drv.h              |  3 -
>   drivers/gpu/drm/msm/msm_kms.h              | 21 ++++--
>   10 files changed, 183 insertions(+), 116 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..366670043190 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> @@ -70,60 +70,62 @@ static int mdp5_hw_init(struct msm_kms *kms)
>   	return 0;
>   }
>   
> -struct mdp5_state *mdp5_get_state(struct drm_atomic_state *s)
> +struct mdp5_state *mdp5_state_from_atomic(struct drm_atomic_state *state)
>   {
> -	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;
> -	int ret;
> +	struct msm_kms_state *kms_state = msm_kms_state_from_atomic(state);
>   
> -	if (state->state)
> -		return state->state;
> +	if (IS_ERR_OR_NULL(kms_state))
> +		return (struct mdp5_state *)kms_state; /* casting ERR_PTR */
>   
> -	ret = drm_modeset_lock(&mdp5_kms->state_lock, s->acquire_ctx);
> -	if (ret)
> -		return ERR_PTR(ret);
> +	return kms_state->state;
> +}
>   
> -	new_state = kmalloc(sizeof(*mdp5_kms->state), GFP_KERNEL);
> -	if (!new_state)
> -		return ERR_PTR(-ENOMEM);
> +struct mdp5_state *mdp5_state_from_dev(struct drm_device *dev)
> +{
> +	struct msm_kms_state *kms_state = msm_kms_state_from_dev(dev);
>   
> -	/* 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;
> +	if (IS_ERR_OR_NULL(kms_state))
> +		return (struct mdp5_state *)kms_state; /* casting ERR_PTR */
>   
> -	state->state = new_state;
> +	return kms_state->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 = (struct mdp5_state *)state;
> +	kfree(mdp_state);
>   }
>   
> -static void mdp5_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *state)
> +static void mdp5_prepare_commit(struct msm_kms *kms,
> +				struct drm_atomic_state *old_state)
>   {
>   	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
> +	struct mdp5_state *mdp5_state = mdp5_state_from_dev(mdp5_kms->dev);
>   	struct device *dev = &mdp5_kms->pdev->dev;
>   
>   	pm_runtime_get_sync(dev);
>   
>   	if (mdp5_kms->smp)
> -		mdp5_smp_prepare_commit(mdp5_kms->smp, &mdp5_kms->state->smp);
> +		mdp5_smp_prepare_commit(mdp5_kms->smp, &mdp5_state->smp);
>   }
>   
> -static void mdp5_complete_commit(struct msm_kms *kms, struct drm_atomic_state *state)
> +static void mdp5_complete_commit(struct msm_kms *kms,
> +				 struct drm_atomic_state *old_state)
>   {
>   	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
> +	struct mdp5_state *mdp5_state = mdp5_state_from_dev(mdp5_kms->dev);
>   	struct device *dev = &mdp5_kms->pdev->dev;
>   
>   	if (mdp5_kms->smp)
> -		mdp5_smp_complete_commit(mdp5_kms->smp, &mdp5_kms->state->smp);
> +		mdp5_smp_complete_commit(mdp5_kms->smp, &mdp5_state->smp);
>   
>   	pm_runtime_put_sync(dev);
>   }
> @@ -229,7 +231,8 @@ 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 +729,6 @@ 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,
> @@ -859,7 +860,8 @@ static int interface_init(struct mdp5_kms *mdp5_kms)
>   	return 0;
>   }
>   
> -static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
> +static int mdp5_init(struct platform_device *pdev, struct drm_device *dev,
> +		     struct msm_kms_state *initial_state)
>   {
>   	struct msm_drm_private *priv = dev->dev_private;
>   	struct mdp5_kms *mdp5_kms;
> @@ -880,9 +882,8 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
>   	mdp5_kms->dev = dev;
>   	mdp5_kms->pdev = pdev;
>   
> -	drm_modeset_lock_init(&mdp5_kms->state_lock);
> -	mdp5_kms->state = kzalloc(sizeof(*mdp5_kms->state), GFP_KERNEL);
> -	if (!mdp5_kms->state) {
> +	initial_state->state = mdp5_duplicate_state(NULL);
> +	if (!initial_state->state) {
>   		ret = -ENOMEM;
>   		goto fail;
>   	}
> @@ -940,7 +941,8 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
>   	 * this section initializes the SMP:
>   	 */
>   	if (mdp5_kms->caps & MDP_CAP_SMP) {
> -		mdp5_kms->smp = mdp5_smp_init(mdp5_kms, &config->hw->smp);
> +		mdp5_kms->smp = mdp5_smp_init(mdp5_kms, &config->hw->smp,
> +					      initial_state->state);
>   		if (IS_ERR(mdp5_kms->smp)) {
>   			ret = PTR_ERR(mdp5_kms->smp);
>   			mdp5_kms->smp = NULL;
> @@ -980,10 +982,11 @@ static int mdp5_bind(struct device *dev, struct device *master, void *data)
>   {
>   	struct drm_device *ddev = dev_get_drvdata(master);
>   	struct platform_device *pdev = to_platform_device(dev);
> +	struct msm_kms_state *initial_state = (struct msm_kms_state *)data;
>   
>   	DBG("");
>   
> -	return mdp5_init(pdev, ddev);
> +	return mdp5_init(pdev, ddev, initial_state);
>   }
>   
>   static void mdp5_unbind(struct device *dev, struct device *master,
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h
> index 425a03d213e5..e23117b82aad 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h
> @@ -28,8 +28,6 @@
>   #include "mdp5_ctl.h"
>   #include "mdp5_smp.h"
>   
> -struct mdp5_state;
> -
>   struct mdp5_kms {
>   	struct mdp_kms base;
>   
> @@ -49,12 +47,6 @@ struct mdp5_kms {
>   	struct mdp5_cfg_handler *cfg;
>   	uint32_t caps;	/* MDP capabilities (MDP_CAP_XXX bits) */
>   
> -	/**
> -	 * Global atomic state.  Do not access directly, use mdp5_get_state()
> -	 */
> -	struct mdp5_state *state;
> -	struct drm_modeset_lock state_lock;
> -
>   	struct mdp5_smp *smp;
>   	struct mdp5_ctl_manager *ctlm;
>   
> @@ -93,7 +85,8 @@ struct mdp5_state {
>   };
>   
>   struct mdp5_state *__must_check
> -mdp5_get_state(struct drm_atomic_state *s);
> +mdp5_state_from_atomic(struct drm_atomic_state *s);
> +struct mdp5_state *__must_check mdp5_state_from_dev(struct drm_device *dev);
>   
>   /* Atomic plane state.  Subclasses the base drm_plane_state in order to
>    * track assigned hwpipe and hw specific state.
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.c
> index 8a00991f03c7..fdd5e12a9d56 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.c
> @@ -52,10 +52,11 @@ int mdp5_mixer_assign(struct drm_atomic_state *s, struct drm_crtc *crtc,
>   {
>   	struct msm_drm_private *priv = s->dev->dev_private;
>   	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
> -	struct mdp5_state *state = mdp5_get_state(s);
> +	struct mdp5_state *state;
>   	struct mdp5_hw_mixer_state *new_state;
>   	int i;
>   
> +	state = mdp5_state_from_atomic(s);
>   	if (IS_ERR(state))
>   		return PTR_ERR(state);
>   
> @@ -129,12 +130,17 @@ int mdp5_mixer_assign(struct drm_atomic_state *s, struct drm_crtc *crtc,
>   
>   void mdp5_mixer_release(struct drm_atomic_state *s, struct mdp5_hw_mixer *mixer)
>   {
> -	struct mdp5_state *state = mdp5_get_state(s);
> -	struct mdp5_hw_mixer_state *new_state = &state->hwmixer;
> +	struct mdp5_state *state;
> +	struct mdp5_hw_mixer_state *new_state;
>   
>   	if (!mixer)
>   		return;
>   
> +	state = mdp5_state_from_atomic(s);
> +	if (IS_ERR(state))
> +		return;
> +
> +	new_state = &state->hwmixer;
>   	if (WARN_ON(!new_state->hwmixer_to_crtc[mixer->idx]))
>   		return;
>   
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_pipe.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_pipe.c
> index ff52c49095f9..dc66ab9fdd50 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_pipe.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_pipe.c
> @@ -24,17 +24,20 @@ int mdp5_pipe_assign(struct drm_atomic_state *s, struct drm_plane *plane,
>   {
>   	struct msm_drm_private *priv = s->dev->dev_private;
>   	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
> -	struct mdp5_state *state;
> +	struct mdp5_state *old_mdp5_state, *new_mdp5_state;
>   	struct mdp5_hw_pipe_state *old_state, *new_state;
>   	int i, j;
>   
> -	state = mdp5_get_state(s);
> -	if (IS_ERR(state))
> -		return PTR_ERR(state);
> +	new_mdp5_state = mdp5_state_from_atomic(s);
> +	if (IS_ERR(new_mdp5_state))
> +		return PTR_ERR(new_mdp5_state);
>   
> -	/* grab old_state after mdp5_get_state(), since now we hold lock: */
> -	old_state = &mdp5_kms->state->hwpipe;
> -	new_state = &state->hwpipe;
> +	old_mdp5_state = mdp5_state_from_dev(s->dev);
> +	if (IS_ERR(old_mdp5_state))
> +		return PTR_ERR(old_mdp5_state);
> +
> +	old_state = &old_mdp5_state->hwpipe;
> +	new_state = &new_mdp5_state->hwpipe;
>   
>   	for (i = 0; i < mdp5_kms->num_hwpipes; i++) {
>   		struct mdp5_hw_pipe *cur = mdp5_kms->hwpipes[i];
> @@ -107,7 +110,7 @@ int mdp5_pipe_assign(struct drm_atomic_state *s, struct drm_plane *plane,
>   		WARN_ON(r_hwpipe);
>   
>   		DBG("%s: alloc SMP blocks", (*hwpipe)->name);
> -		ret = mdp5_smp_assign(mdp5_kms->smp, &state->smp,
> +		ret = mdp5_smp_assign(mdp5_kms->smp, &new_mdp5_state->smp,
>   				(*hwpipe)->pipe, blkcfg);
>   		if (ret)
>   			return -ENOMEM;
> @@ -132,12 +135,17 @@ void mdp5_pipe_release(struct drm_atomic_state *s, struct mdp5_hw_pipe *hwpipe)
>   {
>   	struct msm_drm_private *priv = s->dev->dev_private;
>   	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
> -	struct mdp5_state *state = mdp5_get_state(s);
> -	struct mdp5_hw_pipe_state *new_state = &state->hwpipe;
> +	struct mdp5_state *state;
> +	struct mdp5_hw_pipe_state *new_state;
>   
>   	if (!hwpipe)
>   		return;
>   
> +	state = mdp5_state_from_atomic(s);
> +	if (IS_ERR(state))
> +		return;
> +
> +	new_state = &state->hwpipe;
>   	if (WARN_ON(!new_state->hwpipe_to_plane[hwpipe->idx]))
>   		return;
>   
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
> index ae4983d9d0a5..918e4123e781 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
> @@ -338,6 +338,7 @@ void mdp5_smp_complete_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state
>   void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p)
>   {
>   	struct mdp5_kms *mdp5_kms = get_kms(smp);
> +	struct mdp5_state *mdp5_state;
>   	struct mdp5_hw_pipe_state *hwpstate;
>   	struct mdp5_smp_state *state;
>   	int total = 0, i, j;
> @@ -346,11 +347,12 @@ void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p)
>   	drm_printf(p, "----\t-----\t-----\n");
>   
>   	if (drm_can_sleep())
> -		drm_modeset_lock(&mdp5_kms->state_lock, NULL);
> +		drm_modeset_lock_all(mdp5_kms->dev);
>   
> -	/* grab these *after* we hold the state_lock */
> -	hwpstate = &mdp5_kms->state->hwpipe;
> -	state = &mdp5_kms->state->smp;
> +	/* grab these *after* we hold the modeset_lock */
> +	mdp5_state = mdp5_state_from_dev(mdp5_kms->dev);
> +	hwpstate = &mdp5_state->hwpipe;
> +	state = &mdp5_state->smp;
>   
>   	for (i = 0; i < mdp5_kms->num_hwpipes; i++) {
>   		struct mdp5_hw_pipe *hwpipe = mdp5_kms->hwpipes[i];
> @@ -374,7 +376,7 @@ void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p)
>   			bitmap_weight(state->state, smp->blk_cnt));
>   
>   	if (drm_can_sleep())
> -		drm_modeset_unlock(&mdp5_kms->state_lock);
> +		drm_modeset_unlock_all(mdp5_kms->dev);
>   }
>   
>   void mdp5_smp_destroy(struct mdp5_smp *smp)
> @@ -382,12 +384,15 @@ void mdp5_smp_destroy(struct mdp5_smp *smp)
>   	kfree(smp);
>   }
>   
> -struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms, const struct mdp5_smp_block *cfg)
> +struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms,
> +			       const struct mdp5_smp_block *cfg,
> +			       struct mdp5_state *mdp5_state)
>   {
> -	struct mdp5_smp_state *state = &mdp5_kms->state->smp;
> +	struct mdp5_smp_state *state;
>   	struct mdp5_smp *smp = NULL;
>   	int ret;
>   
> +	state = &mdp5_state->smp;
>   	smp = kzalloc(sizeof(*smp), GFP_KERNEL);
>   	if (unlikely(!smp)) {
>   		ret = -ENOMEM;
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h
> index b41d0448fbe8..1bfa22b63a2d 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h
> @@ -69,6 +69,7 @@ struct mdp5_smp_state {
>   };
>   
>   struct mdp5_kms;
> +struct mdp5_state;
>   struct mdp5_smp;
>   
>   /*
> @@ -78,7 +79,8 @@ struct mdp5_smp;
>    */
>   
>   struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms,
> -		const struct mdp5_smp_block *cfg);
> +		const struct mdp5_smp_block *cfg,
> +		struct mdp5_state *mdp5_state);
>   void  mdp5_smp_destroy(struct mdp5_smp *smp);
>   
>   void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p);
> diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
> index bf5f8c39f34d..e792158676aa 100644
> --- a/drivers/gpu/drm/msm/msm_atomic.c
> +++ b/drivers/gpu/drm/msm/msm_atomic.c
> @@ -220,16 +220,6 @@ int msm_atomic_commit(struct drm_device *dev,
>   
>   	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
>   
> -	/*
> -	 * This is the point of no return - everything below never fails except
> -	 * when the hw goes bonghits. Which means we can commit the new state on
> -	 * the software side now.
> -	 *
> -	 * swap driver private state while still holding state_lock
> -	 */
> -	if (to_kms_state(state)->state)
> -		priv->kms->funcs->swap_state(priv->kms, state);
> -
>   	/*
>   	 * Everything below can be run asynchronously without the need to grab
>   	 * any modeset locks at all under one conditions: It must be guaranteed
> @@ -262,30 +252,3 @@ 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 30cd514d8f7c..7e8f640062ef 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -42,11 +42,79 @@ static const struct drm_mode_config_funcs mode_config_funcs = {
>   	.output_poll_changed = drm_fb_helper_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 *msm_kms_from_obj(struct drm_private_obj *obj)
> +{
> +	return container_of(obj, struct msm_kms, base);
> +}
> +
> +static inline
> +struct msm_kms_state *msm_kms_state_from_priv(struct drm_private_state *priv)
> +{
> +	return container_of(priv, struct msm_kms_state, base);
> +}
> +
> +
> +struct msm_kms_state *msm_kms_state_from_atomic(struct drm_atomic_state *state)
> +{
> +	struct msm_drm_private *priv = state->dev->dev_private;
> +	struct drm_private_obj *obj = &priv->kms->base;
> +	struct drm_private_state *priv_state;
> +
> +	priv_state = drm_atomic_get_private_obj_state(state, obj);
> +	if (IS_ERR_OR_NULL(priv_state))
> +		return (struct msm_kms_state *)state; /* casting ERR_PTR */
> +
> +	return msm_kms_state_from_priv(priv_state);
> +}
> +
> +struct msm_kms_state *msm_kms_state_from_dev(struct drm_device *dev)
> +{
> +	struct msm_drm_private *priv = dev->dev_private;
> +	struct drm_private_obj *obj = &priv->kms->base;
> +	struct drm_private_state *priv_state = obj->state;
> +
> +	return msm_kms_state_from_priv(priv_state);
> +}
> +
> +static struct drm_private_state *
> +msm_kms_duplicate_state(struct drm_private_obj *obj)
> +{
> +	struct msm_kms *kms = msm_kms_from_obj(obj);
> +	struct msm_kms_state *state = msm_kms_state_from_priv(obj->state);
> +	struct msm_kms_state *new_state;
> +
> +	new_state = kzalloc(sizeof(*new_state), GFP_KERNEL);
> +	if (!new_state)
> +		return NULL;
> +
> +	if (kms->funcs->duplicate_state)
> +		new_state->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 *priv_state)
> +{
> +	struct msm_kms *kms = msm_kms_from_obj(obj);
> +	struct msm_kms_state *state = msm_kms_state_from_priv(priv_state);
> +
> +	if (kms->funcs->destroy_state)
> +		kms->funcs->destroy_state(state->state);
> +	kfree(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,
> +};
> +
> +

Minor nit: Two blank lines here^

>   #ifdef CONFIG_DRM_MSM_REGISTER_LOGGING
>   static bool reglog = false;
>   MODULE_PARM_DESC(reglog, "Enable register read/write logging");
> @@ -245,6 +313,8 @@ static int msm_drm_uninit(struct device *dev)
>   	flush_workqueue(priv->atomic_wq);
>   	destroy_workqueue(priv->atomic_wq);
>   
> +	drm_atomic_private_obj_fini(&kms->base);
> +
>   	if (kms && kms->funcs)
>   		kms->funcs->destroy(kms);
>   
> @@ -356,6 +426,7 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
>   	struct drm_device *ddev;
>   	struct msm_drm_private *priv;
>   	struct msm_kms *kms;
> +	struct msm_kms_state *initial_state;
>   	int ret;
>   
>   	ddev = drm_dev_alloc(drv, dev);
> @@ -364,6 +435,10 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
>   		return PTR_ERR(ddev);
>   	}
>   
> +	initial_state = kzalloc(sizeof(*initial_state), GFP_KERNEL);
> +	if (!initial_state)
> +		return -ENOMEM;
> +
>   	platform_set_drvdata(pdev, ddev);
>   
>   	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> @@ -394,7 +469,7 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
>   	drm_mode_config_init(ddev);
>   
>   	/* Bind all our sub-components: */
> -	ret = component_bind_all(dev, ddev);
> +	ret = component_bind_all(dev, initial_state);

Only the core kms component (mdp4/mdp5/dpu) will use initial_state,
and the encoders drivers (DSI/HDMI) would discard it, right? I guess
it's still better than passing ddev, which can be derived from the
component master.

Reviewed-by: Archit Taneja <architt@codeaurora.org>

>   	if (ret) {
>   		msm_mdss_destroy(ddev);
>   		kfree(priv);
> @@ -433,6 +508,10 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
>   		goto fail;
>   	}
>   
> +	drm_atomic_private_obj_init(&kms->base,
> +				    &initial_state->base,
> +				    &kms_state_funcs);
> +
>   	if (kms) {
>   		ret = kms->funcs->hw_init(kms);
>   		if (ret) {
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index 48ed5b9a8580..c5b8c989b859 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -162,9 +162,6 @@ 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);
>   
>   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 17d5824417ad..24d09fcebf16 100644
> --- a/drivers/gpu/drm/msm/msm_kms.h
> +++ b/drivers/gpu/drm/msm/msm_kms.h
> @@ -42,6 +42,8 @@ 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_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
>   	void (*complete_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
> @@ -68,6 +70,8 @@ struct msm_kms_funcs {
>   };
>   
>   struct msm_kms {
> +	struct drm_private_obj base;
> +
>   	const struct msm_kms_funcs *funcs;
>   
>   	/* irq number to be passed on to drm_irq_install */
> @@ -78,16 +82,23 @@ struct msm_kms {
>   };
>   
>   /**
> - * Subclass of drm_atomic_state, to allow kms backend to have driver
> + * Subclass of drm_private_state, to allow kms backend to have driver
>    * private global state.  The kms backend can do whatever it wants
> - * with the ->state ptr.  On ->atomic_state_clear() the ->state ptr
> - * is kfree'd and set back to NULL.
> + * with the ->state ptr.
>    */
>   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)
> +
> +/**
> + * Extracts the msm_kms_state from either an atomic state, or the current
> + * device. One or the other might be desirable depending on whether you want the
> + * currently configured msm_kms_state (from_dev), or you would like the state
> + * which is about to be applied (from_atomic).
> + */
> +struct msm_kms_state *msm_kms_state_from_dev(struct drm_device *dev);
> +struct msm_kms_state *msm_kms_state_from_atomic(struct drm_atomic_state *state);
>   
>   static inline void msm_kms_init(struct msm_kms *kms,
>   		const struct msm_kms_funcs *funcs)
> 

[PATCH v2 2/6] drm/msm: Refactor complete_commit() to look more the helpers

[Sean Paul]

Factor out the commit_tail() portions of complete_commit() into a
separate function to facilitate moving to the atomic helpers in future
patches.

Changes in v2:
- None

Cc: Jeykumar Sankaran <jsanka@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/msm/msm_atomic.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index e792158676aa..671a18ee977d 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -97,18 +97,12 @@ static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
 	}
 }
 
-/* The (potentially) asynchronous part of the commit.  At this point
- * nothing can fail short of armageddon.
- */
-static void complete_commit(struct msm_commit *c, bool async)
+static void msm_atomic_commit_tail(struct drm_atomic_state *state)
 {
-	struct drm_atomic_state *state = c->state;
 	struct drm_device *dev = state->dev;
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_kms *kms = priv->kms;
 
-	drm_atomic_helper_wait_for_fences(dev, state, false);
-
 	kms->funcs->prepare_commit(kms, state);
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);
@@ -135,6 +129,19 @@ static void complete_commit(struct msm_commit *c, bool async)
 	drm_atomic_helper_cleanup_planes(dev, state);
 
 	kms->funcs->complete_commit(kms, state);
+}
+
+/* The (potentially) asynchronous part of the commit.  At this point
+ * nothing can fail short of armageddon.
+ */
+static void complete_commit(struct msm_commit *c)
+{
+	struct drm_atomic_state *state = c->state;
+	struct drm_device *dev = state->dev;
+
+	drm_atomic_helper_wait_for_fences(dev, state, false);
+
+	msm_atomic_commit_tail(state);
 
 	drm_atomic_state_put(state);
 
@@ -143,7 +150,7 @@ static void complete_commit(struct msm_commit *c, bool async)
 
 static void commit_worker(struct work_struct *work)
 {
-	complete_commit(container_of(work, struct msm_commit, work), true);
+	complete_commit(container_of(work, struct msm_commit, work));
 }
 
 /**
@@ -242,7 +249,7 @@ int msm_atomic_commit(struct drm_device *dev,
 		return 0;
 	}
 
-	complete_commit(c, false);
+	complete_commit(c);
 
 	return 0;
 
-- 
Sean Paul, Software Engineer, Google / Chromium OS

Re: [PATCH v2 2/6] drm/msm: Refactor complete_commit() to look more the helpers

[Archit Taneja]

On Thursday 29 March 2018 12:36 AM, Sean Paul wrote:
> Factor out the commit_tail() portions of complete_commit() into a
> separate function to facilitate moving to the atomic helpers in future
> patches.
> 

Reviewed-by: Archit Taneja <architt@codeaurora.org>

> Changes in v2:
> - None
> 
> Cc: Jeykumar Sankaran <jsanka@codeaurora.org>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> ---
>   drivers/gpu/drm/msm/msm_atomic.c | 25 ++++++++++++++++---------
>   1 file changed, 16 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
> index e792158676aa..671a18ee977d 100644
> --- a/drivers/gpu/drm/msm/msm_atomic.c
> +++ b/drivers/gpu/drm/msm/msm_atomic.c
> @@ -97,18 +97,12 @@ static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
>   	}
>   }
>   
> -/* The (potentially) asynchronous part of the commit.  At this point
> - * nothing can fail short of armageddon.
> - */
> -static void complete_commit(struct msm_commit *c, bool async)
> +static void msm_atomic_commit_tail(struct drm_atomic_state *state)
>   {
> -	struct drm_atomic_state *state = c->state;
>   	struct drm_device *dev = state->dev;
>   	struct msm_drm_private *priv = dev->dev_private;
>   	struct msm_kms *kms = priv->kms;
>   
> -	drm_atomic_helper_wait_for_fences(dev, state, false);
> -
>   	kms->funcs->prepare_commit(kms, state);
>   
>   	drm_atomic_helper_commit_modeset_disables(dev, state);
> @@ -135,6 +129,19 @@ static void complete_commit(struct msm_commit *c, bool async)
>   	drm_atomic_helper_cleanup_planes(dev, state);
>   
>   	kms->funcs->complete_commit(kms, state);
> +}
> +
> +/* The (potentially) asynchronous part of the commit.  At this point
> + * nothing can fail short of armageddon.
> + */
> +static void complete_commit(struct msm_commit *c)
> +{
> +	struct drm_atomic_state *state = c->state;
> +	struct drm_device *dev = state->dev;
> +
> +	drm_atomic_helper_wait_for_fences(dev, state, false);
> +
> +	msm_atomic_commit_tail(state);
>   
>   	drm_atomic_state_put(state);
>   
> @@ -143,7 +150,7 @@ static void complete_commit(struct msm_commit *c, bool async)
>   
>   static void commit_worker(struct work_struct *work)
>   {
> -	complete_commit(container_of(work, struct msm_commit, work), true);
> +	complete_commit(container_of(work, struct msm_commit, work));
>   }
>   
>   /**
> @@ -242,7 +249,7 @@ int msm_atomic_commit(struct drm_device *dev,
>   		return 0;
>   	}
>   
> -	complete_commit(c, false);
> +	complete_commit(c);
>   
>   	return 0;
>   
> 

[PATCH v2 3/6] drm/msm: Mark the crtc->state->event consumed

[Sean Paul]

Don't leave the event != NULL once it's consumed, this is used a signal
to the atomic helpers that the event will be handled by the driver.

Changes in v2:
- None

Cc: Jeykumar Sankaran <jsanka@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c | 1 +
 drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c
index 6e5e1aa54ce1..b001699297c4 100644
--- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c
+++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c
@@ -351,6 +351,7 @@ static void mdp4_crtc_atomic_flush(struct drm_crtc *crtc,
 
 	spin_lock_irqsave(&dev->event_lock, flags);
 	mdp4_crtc->event = crtc->state->event;
+	crtc->state->event = NULL;
 	spin_unlock_irqrestore(&dev->event_lock, flags);
 
 	blend_setup(crtc);
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
index 9893e43ba6c5..76b96081916f 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
@@ -708,6 +708,7 @@ static void mdp5_crtc_atomic_flush(struct drm_crtc *crtc,
 
 	spin_lock_irqsave(&dev->event_lock, flags);
 	mdp5_crtc->event = crtc->state->event;
+	crtc->state->event = NULL;
 	spin_unlock_irqrestore(&dev->event_lock, flags);
 
 	/*
-- 
Sean Paul, Software Engineer, Google / Chromium OS

Re: [PATCH v2 3/6] drm/msm: Mark the crtc->state->event consumed

[Archit Taneja]

On Thursday 29 March 2018 12:36 AM, Sean Paul wrote:
> Don't leave the event != NULL once it's consumed, this is used a signal
s/used a/used as a ?
> to the atomic helpers that the event will be handled by the driver.
>

Reviewed-by: Archit Taneja <architt@codeaurora.org>

> Changes in v2:
> - None
> 
> Cc: Jeykumar Sankaran <jsanka@codeaurora.org>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> ---
>   drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c | 1 +
>   drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 1 +
>   2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c
> index 6e5e1aa54ce1..b001699297c4 100644
> --- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c
> @@ -351,6 +351,7 @@ static void mdp4_crtc_atomic_flush(struct drm_crtc *crtc,
>   
>   	spin_lock_irqsave(&dev->event_lock, flags);
>   	mdp4_crtc->event = crtc->state->event;
> +	crtc->state->event = NULL;
>   	spin_unlock_irqrestore(&dev->event_lock, flags);
>   
>   	blend_setup(crtc);
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> index 9893e43ba6c5..76b96081916f 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> @@ -708,6 +708,7 @@ static void mdp5_crtc_atomic_flush(struct drm_crtc *crtc,
>   
>   	spin_lock_irqsave(&dev->event_lock, flags);
>   	mdp5_crtc->event = crtc->state->event;
> +	crtc->state->event = NULL;
>   	spin_unlock_irqrestore(&dev->event_lock, flags);
>   
>   	/*
> 

[PATCH v2 4/6] drm/msm: Issue queued events when disabling crtc

[Sean Paul]

Ensure that any queued events are issued when disabling the crtc. This
avoids timeouts when we come back and wait for dependencies (like the
previous frame's flip_done).

Changes in v2:
- None

Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
index 76b96081916f..10271359789e 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
@@ -430,6 +430,7 @@ static void mdp5_crtc_atomic_disable(struct drm_crtc *crtc,
 	struct mdp5_crtc_state *mdp5_cstate = to_mdp5_crtc_state(crtc->state);
 	struct mdp5_kms *mdp5_kms = get_kms(crtc);
 	struct device *dev = &mdp5_kms->pdev->dev;
+	unsigned long flags;
 
 	DBG("%s", crtc->name);
 
@@ -445,6 +446,14 @@ static void mdp5_crtc_atomic_disable(struct drm_crtc *crtc,
 	mdp_irq_unregister(&mdp5_kms->base, &mdp5_crtc->err);
 	pm_runtime_put_sync(dev);
 
+	if (crtc->state->event && !crtc->state->active) {
+		WARN_ON(mdp5_crtc->event);
+		spin_lock_irqsave(&mdp5_kms->dev->event_lock, flags);
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+		crtc->state->event = NULL;
+		spin_unlock_irqrestore(&mdp5_kms->dev->event_lock, flags);
+	}
+
 	mdp5_crtc->enabled = false;
 }
 
-- 
Sean Paul, Software Engineer, Google / Chromium OS

Re: [PATCH v2 4/6] drm/msm: Issue queued events when disabling crtc

[Archit Taneja]

On Thursday 29 March 2018 12:36 AM, Sean Paul wrote:
> Ensure that any queued events are issued when disabling the crtc. This
> avoids timeouts when we come back and wait for dependencies (like the
> previous frame's flip_done).

Reviewed-by: Archit Taneja <architt@codeaurora.org>

> 
> Changes in v2:
> - None
> 
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> ---
>   drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> index 76b96081916f..10271359789e 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> @@ -430,6 +430,7 @@ static void mdp5_crtc_atomic_disable(struct drm_crtc *crtc,
>   	struct mdp5_crtc_state *mdp5_cstate = to_mdp5_crtc_state(crtc->state);
>   	struct mdp5_kms *mdp5_kms = get_kms(crtc);
>   	struct device *dev = &mdp5_kms->pdev->dev;
> +	unsigned long flags;
>   
>   	DBG("%s", crtc->name);
>   
> @@ -445,6 +446,14 @@ static void mdp5_crtc_atomic_disable(struct drm_crtc *crtc,
>   	mdp_irq_unregister(&mdp5_kms->base, &mdp5_crtc->err);
>   	pm_runtime_put_sync(dev);
>   
> +	if (crtc->state->event && !crtc->state->active) {
> +		WARN_ON(mdp5_crtc->event);
> +		spin_lock_irqsave(&mdp5_kms->dev->event_lock, flags);
> +		drm_crtc_send_vblank_event(crtc, crtc->state->event);
> +		crtc->state->event = NULL;
> +		spin_unlock_irqrestore(&mdp5_kms->dev->event_lock, flags);
> +	}
> +
>   	mdp5_crtc->enabled = false;
>   }
>   
> 

[PATCH v2 5/6] drm/msm: Remove msm_commit/worker, use atomic helper commit

[Sean Paul]

Moving further towards switching fully to the the atomic helpers, this
patch removes the hand-rolled worker nonblock commit code and uses the
atomic helpers commit_work model.

Changes in v2:
- Remove commit_destroy()
- Shuffle order of commit_tail calls to further serialize commits
- Use stall in swap_state to avoid abandoned events on disable

Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/msm/msm_atomic.c | 153 +++++++++----------------------
 drivers/gpu/drm/msm/msm_drv.c    |   1 -
 drivers/gpu/drm/msm/msm_drv.h    |   4 -
 3 files changed, 42 insertions(+), 116 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index 671a18ee977d..52249565cc03 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -20,66 +20,6 @@
 #include "msm_gem.h"
 #include "msm_fence.h"
 
-struct msm_commit {
-	struct drm_device *dev;
-	struct drm_atomic_state *state;
-	struct work_struct work;
-	uint32_t crtc_mask;
-};
-
-static void commit_worker(struct work_struct *work);
-
-/* block until specified crtcs are no longer pending update, and
- * atomically mark them as pending update
- */
-static int start_atomic(struct msm_drm_private *priv, uint32_t crtc_mask)
-{
-	int ret;
-
-	spin_lock(&priv->pending_crtcs_event.lock);
-	ret = wait_event_interruptible_locked(priv->pending_crtcs_event,
-			!(priv->pending_crtcs & crtc_mask));
-	if (ret == 0) {
-		DBG("start: %08x", crtc_mask);
-		priv->pending_crtcs |= crtc_mask;
-	}
-	spin_unlock(&priv->pending_crtcs_event.lock);
-
-	return ret;
-}
-
-/* clear specified crtcs (no longer pending update)
- */
-static void end_atomic(struct msm_drm_private *priv, uint32_t crtc_mask)
-{
-	spin_lock(&priv->pending_crtcs_event.lock);
-	DBG("end: %08x", crtc_mask);
-	priv->pending_crtcs &= ~crtc_mask;
-	wake_up_all_locked(&priv->pending_crtcs_event);
-	spin_unlock(&priv->pending_crtcs_event.lock);
-}
-
-static struct msm_commit *commit_init(struct drm_atomic_state *state)
-{
-	struct msm_commit *c = kzalloc(sizeof(*c), GFP_KERNEL);
-
-	if (!c)
-		return NULL;
-
-	c->dev = state->dev;
-	c->state = state;
-
-	INIT_WORK(&c->work, commit_worker);
-
-	return c;
-}
-
-static void commit_destroy(struct msm_commit *c)
-{
-	end_atomic(c->dev->dev_private, c->crtc_mask);
-	kfree(c);
-}
-
 static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
 		struct drm_atomic_state *old_state)
 {
@@ -126,31 +66,37 @@ static void msm_atomic_commit_tail(struct drm_atomic_state *state)
 
 	msm_atomic_wait_for_commit_done(dev, state);
 
-	drm_atomic_helper_cleanup_planes(dev, state);
-
 	kms->funcs->complete_commit(kms, state);
+
+	drm_atomic_helper_wait_for_vblanks(dev, state);
+
+	drm_atomic_helper_commit_hw_done(state);
+
+	drm_atomic_helper_cleanup_planes(dev, state);
 }
 
 /* The (potentially) asynchronous part of the commit.  At this point
  * nothing can fail short of armageddon.
  */
-static void complete_commit(struct msm_commit *c)
+static void commit_tail(struct drm_atomic_state *state)
 {
-	struct drm_atomic_state *state = c->state;
-	struct drm_device *dev = state->dev;
+	drm_atomic_helper_wait_for_fences(state->dev, state, false);
 
-	drm_atomic_helper_wait_for_fences(dev, state, false);
+	drm_atomic_helper_wait_for_dependencies(state);
 
 	msm_atomic_commit_tail(state);
 
-	drm_atomic_state_put(state);
+	drm_atomic_helper_commit_cleanup_done(state);
 
-	commit_destroy(c);
+	drm_atomic_state_put(state);
 }
 
-static void commit_worker(struct work_struct *work)
+static void commit_work(struct work_struct *work)
 {
-	complete_commit(container_of(work, struct msm_commit, work));
+	struct drm_atomic_state *state = container_of(work,
+						      struct drm_atomic_state,
+						      commit_work);
+	commit_tail(state);
 }
 
 /**
@@ -169,17 +115,12 @@ int msm_atomic_commit(struct drm_device *dev,
 		struct drm_atomic_state *state, bool nonblock)
 {
 	struct msm_drm_private *priv = dev->dev_private;
-	struct msm_commit *c;
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *crtc_state;
 	struct drm_plane *plane;
 	struct drm_plane_state *old_plane_state, *new_plane_state;
 	int i, ret;
 
-	ret = drm_atomic_helper_prepare_planes(dev, state);
-	if (ret)
-		return ret;
-
 	/*
 	 * Note that plane->atomic_async_check() should fail if we need
 	 * to re-assign hwpipe or anything that touches global atomic
@@ -187,45 +128,39 @@ int msm_atomic_commit(struct drm_device *dev,
 	 * cases.
 	 */
 	if (state->async_update) {
+		ret = drm_atomic_helper_prepare_planes(dev, state);
+		if (ret)
+			return ret;
+
 		drm_atomic_helper_async_commit(dev, state);
 		drm_atomic_helper_cleanup_planes(dev, state);
 		return 0;
 	}
 
-	c = commit_init(state);
-	if (!c) {
-		ret = -ENOMEM;
-		goto error;
-	}
+	ret = drm_atomic_helper_setup_commit(state, nonblock);
+	if (ret)
+		return ret;
 
-	/*
-	 * Figure out what crtcs we have:
-	 */
-	for_each_new_crtc_in_state(state, crtc, crtc_state, i)
-		c->crtc_mask |= drm_crtc_mask(crtc);
+	INIT_WORK(&state->commit_work, commit_work);
 
-	/*
-	 * Figure out what fence to wait for:
-	 */
-	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
-		if ((new_plane_state->fb != old_plane_state->fb) && new_plane_state->fb) {
-			struct drm_gem_object *obj = msm_framebuffer_bo(new_plane_state->fb, 0);
-			struct msm_gem_object *msm_obj = to_msm_bo(obj);
-			struct dma_fence *fence = reservation_object_get_excl_rcu(msm_obj->resv);
-
-			drm_atomic_set_fence_for_plane(new_plane_state, fence);
-		}
+	ret = drm_atomic_helper_prepare_planes(dev, state);
+	if (ret)
+		return ret;
+
+	if (!nonblock) {
+		ret = drm_atomic_helper_wait_for_fences(dev, state, true);
+		if (ret)
+			goto error;
 	}
 
 	/*
-	 * Wait for pending updates on any of the same crtc's and then
-	 * mark our set of crtc's as busy:
+	 * This is the point of no return - everything below never fails except
+	 * when the hw goes bonghits. Which means we can commit the new state on
+	 * the software side now.
+	 *
+	 * swap driver private state while still holding state_lock
 	 */
-	ret = start_atomic(dev->dev_private, c->crtc_mask);
-	if (ret)
-		goto err_free;
-
-	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
+	BUG_ON(drm_atomic_helper_swap_state(state, true) < 0);
 
 	/*
 	 * Everything below can be run asynchronously without the need to grab
@@ -244,17 +179,13 @@ int msm_atomic_commit(struct drm_device *dev,
 	 */
 
 	drm_atomic_state_get(state);
-	if (nonblock) {
-		queue_work(priv->atomic_wq, &c->work);
-		return 0;
-	}
-
-	complete_commit(c);
+	if (nonblock)
+		queue_work(system_unbound_wq, &state->commit_work);
+	else
+		commit_tail(state);
 
 	return 0;
 
-err_free:
-	kfree(c);
 error:
 	drm_atomic_helper_cleanup_planes(dev, state);
 	return ret;
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 7e8f640062ef..d1a45a68c287 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -459,7 +459,6 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 
 	priv->wq = alloc_ordered_workqueue("msm", 0);
 	priv->atomic_wq = alloc_ordered_workqueue("msm:atomic", 0);
-	init_waitqueue_head(&priv->pending_crtcs_event);
 
 	INIT_LIST_HEAD(&priv->inactive_list);
 	INIT_LIST_HEAD(&priv->vblank_ctrl.event_list);
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index c5b8c989b859..b89fa5186eb8 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -117,10 +117,6 @@ struct msm_drm_private {
 	struct workqueue_struct *wq;
 	struct workqueue_struct *atomic_wq;
 
-	/* crtcs pending async atomic updates: */
-	uint32_t pending_crtcs;
-	wait_queue_head_t pending_crtcs_event;
-
 	unsigned int num_planes;
 	struct drm_plane *planes[16];
 
-- 
Sean Paul, Software Engineer, Google / Chromium OS

[PATCH v2 6/6] drm/msm: Switch to atomic_helper_commit()

[Sean Paul]

Now that all of the msm-specific goo is tucked safely away we can switch
over to using the atomic helper commit directly. \o/

Changes in v2:
- None

Cc: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/msm/msm_atomic.c | 120 +------------------------------
 drivers/gpu/drm/msm/msm_drv.c    |   7 +-
 drivers/gpu/drm/msm/msm_drv.h    |   3 +-
 3 files changed, 8 insertions(+), 122 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index 52249565cc03..d593ac3de1df 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -17,8 +17,6 @@
 
 #include "msm_drv.h"
 #include "msm_kms.h"
-#include "msm_gem.h"
-#include "msm_fence.h"
 
 static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
 		struct drm_atomic_state *old_state)
@@ -37,7 +35,7 @@ static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
 	}
 }
 
-static void msm_atomic_commit_tail(struct drm_atomic_state *state)
+void msm_atomic_commit_tail(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;
 	struct msm_drm_private *priv = dev->dev_private;
@@ -74,119 +72,3 @@ static void msm_atomic_commit_tail(struct drm_atomic_state *state)
 
 	drm_atomic_helper_cleanup_planes(dev, state);
 }
-
-/* The (potentially) asynchronous part of the commit.  At this point
- * nothing can fail short of armageddon.
- */
-static void commit_tail(struct drm_atomic_state *state)
-{
-	drm_atomic_helper_wait_for_fences(state->dev, state, false);
-
-	drm_atomic_helper_wait_for_dependencies(state);
-
-	msm_atomic_commit_tail(state);
-
-	drm_atomic_helper_commit_cleanup_done(state);
-
-	drm_atomic_state_put(state);
-}
-
-static void commit_work(struct work_struct *work)
-{
-	struct drm_atomic_state *state = container_of(work,
-						      struct drm_atomic_state,
-						      commit_work);
-	commit_tail(state);
-}
-
-/**
- * drm_atomic_helper_commit - commit validated state object
- * @dev: DRM device
- * @state: the driver state object
- * @nonblock: nonblocking commit
- *
- * This function commits a with drm_atomic_helper_check() pre-validated state
- * object. This can still fail when e.g. the framebuffer reservation fails.
- *
- * RETURNS
- * Zero for success or -errno.
- */
-int msm_atomic_commit(struct drm_device *dev,
-		struct drm_atomic_state *state, bool nonblock)
-{
-	struct msm_drm_private *priv = dev->dev_private;
-	struct drm_crtc *crtc;
-	struct drm_crtc_state *crtc_state;
-	struct drm_plane *plane;
-	struct drm_plane_state *old_plane_state, *new_plane_state;
-	int i, ret;
-
-	/*
-	 * Note that plane->atomic_async_check() should fail if we need
-	 * to re-assign hwpipe or anything that touches global atomic
-	 * state, so we'll never go down the async update path in those
-	 * cases.
-	 */
-	if (state->async_update) {
-		ret = drm_atomic_helper_prepare_planes(dev, state);
-		if (ret)
-			return ret;
-
-		drm_atomic_helper_async_commit(dev, state);
-		drm_atomic_helper_cleanup_planes(dev, state);
-		return 0;
-	}
-
-	ret = drm_atomic_helper_setup_commit(state, nonblock);
-	if (ret)
-		return ret;
-
-	INIT_WORK(&state->commit_work, commit_work);
-
-	ret = drm_atomic_helper_prepare_planes(dev, state);
-	if (ret)
-		return ret;
-
-	if (!nonblock) {
-		ret = drm_atomic_helper_wait_for_fences(dev, state, true);
-		if (ret)
-			goto error;
-	}
-
-	/*
-	 * This is the point of no return - everything below never fails except
-	 * when the hw goes bonghits. Which means we can commit the new state on
-	 * the software side now.
-	 *
-	 * swap driver private state while still holding state_lock
-	 */
-	BUG_ON(drm_atomic_helper_swap_state(state, true) < 0);
-
-	/*
-	 * Everything below can be run asynchronously without the need to grab
-	 * any modeset locks at all under one conditions: It must be guaranteed
-	 * that the asynchronous work has either been cancelled (if the driver
-	 * supports it, which at least requires that the framebuffers get
-	 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
-	 * before the new state gets committed on the software side with
-	 * drm_atomic_helper_swap_state().
-	 *
-	 * This scheme allows new atomic state updates to be prepared and
-	 * checked in parallel to the asynchronous completion of the previous
-	 * update. Which is important since compositors need to figure out the
-	 * composition of the next frame right after having submitted the
-	 * current layout.
-	 */
-
-	drm_atomic_state_get(state);
-	if (nonblock)
-		queue_work(system_unbound_wq, &state->commit_work);
-	else
-		commit_tail(state);
-
-	return 0;
-
-error:
-	drm_atomic_helper_cleanup_planes(dev, state);
-	return ret;
-}
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index d1a45a68c287..eb5569d4dd57 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -41,7 +41,11 @@ static const struct drm_mode_config_funcs mode_config_funcs = {
 	.fb_create = msm_framebuffer_create,
 	.output_poll_changed = drm_fb_helper_output_poll_changed,
 	.atomic_check = drm_atomic_helper_check,
-	.atomic_commit = msm_atomic_commit,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static const struct drm_mode_config_helper_funcs mode_config_helper_funcs = {
+	.atomic_commit_tail = msm_atomic_commit_tail,
 };
 
 static inline
@@ -520,6 +524,7 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 	}
 
 	ddev->mode_config.funcs = &mode_config_funcs;
+	ddev->mode_config.helper_private = &mode_config_helper_funcs;
 
 	ret = drm_vblank_init(ddev, priv->num_crtcs);
 	if (ret < 0) {
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index b89fa5186eb8..3e89d7eac02f 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -156,8 +156,7 @@ struct msm_format {
 	uint32_t pixel_format;
 };
 
-int msm_atomic_commit(struct drm_device *dev,
-		struct drm_atomic_state *state, bool nonblock);
+void msm_atomic_commit_tail(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);
-- 
Sean Paul, Software Engineer, Google / Chromium OS