From: Archit Taneja architt@codeaurora.org
Global shared resources (hwpipes, hwmixers and SMP) for MDP5 are implemented as a part of atomic state by subclassing drm_atomic_state.
The preferred approach is to use the drm_private_obj infrastructure available in the atomic core.
mdp5_global_state is introduced as a drm atomic private object. The two funcs mdp5_get_global_state() and mdp5_get_existing_global_state() are the two variants that will be used to access mdp5_global_state.
This will replace the existing mdp5_state struct (which subclasses drm_atomic_state) and the funcs around it. These will be removed later once we mdp5_global_state is put to use everywhere.
Changes in v3: - Added glob_state_lock instead of pushing it into the core - Added to the msm atomic helper patch set
Signed-off-by: Archit Taneja architt@codeaurora.org Signed-off-by: Rob Clark robdclark@gmail.com Signed-off-by: Sean Paul seanpaul@chromium.org --- drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 87 ++++++++++++++++++++++++ drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h | 25 +++++++ 2 files changed, 112 insertions(+)
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c index 6d8e3a9a6fc0..fcbdef385a8a 100644 --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c @@ -106,6 +106,86 @@ static void mdp5_swap_state(struct msm_kms *kms, struct drm_atomic_state *state) swap(to_kms_state(state)->state, mdp5_kms->state); }
+/* Global/shared object state funcs */ + +/* + * This is a helper that returns the private state currently in operation. + * Note that this would return the "old_state" if called in the atomic check + * path, and the "new_state" after the atomic swap has been done. + */ +struct mdp5_global_state * +mdp5_get_existing_global_state(struct mdp5_kms *mdp5_kms) +{ + return to_mdp5_global_state(mdp5_kms->glob_state.state); +} + +/* + * This acquires the modeset lock set aside for global state, creates + * a new duplicated private object state. + */ +struct mdp5_global_state *mdp5_get_global_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 drm_private_state *priv_state; + int ret; + + ret = drm_modeset_lock(&mdp5_kms->glob_state_lock, s->acquire_ctx); + if (ret) + return ERR_PTR(ret); + + priv_state = drm_atomic_get_private_obj_state(s, &mdp5_kms->glob_state); + if (IS_ERR(priv_state)) + return ERR_CAST(priv_state); + + return to_mdp5_global_state(priv_state); +} + +static struct drm_private_state * +mdp5_global_duplicate_state(struct drm_private_obj *obj) +{ + struct mdp5_global_state *state; + + state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL); + if (!state) + return NULL; + + __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base); + + return &state->base; +} + +static void mdp5_global_destroy_state(struct drm_private_obj *obj, + struct drm_private_state *state) +{ + struct mdp5_global_state *mdp5_state = to_mdp5_global_state(state); + + kfree(mdp5_state); +} + +static const struct drm_private_state_funcs mdp5_global_state_funcs = { + .atomic_duplicate_state = mdp5_global_duplicate_state, + .atomic_destroy_state = mdp5_global_destroy_state, +}; + +static int mdp5_global_obj_init(struct mdp5_kms *mdp5_kms) +{ + struct mdp5_global_state *state; + + drm_modeset_lock_init(&mdp5_kms->glob_state_lock); + + state = kzalloc(sizeof(*state), GFP_KERNEL); + if (!state) + return -ENOMEM; + + state->mdp5_kms = mdp5_kms; + + drm_atomic_private_obj_init(&mdp5_kms->glob_state, + &state->base, + &mdp5_global_state_funcs); + return 0; +} + static void mdp5_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *state) { struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms)); @@ -727,6 +807,9 @@ static void mdp5_destroy(struct platform_device *pdev) if (mdp5_kms->rpm_enabled) pm_runtime_disable(&pdev->dev);
+ drm_atomic_private_obj_fini(&mdp5_kms->glob_state); + drm_modeset_lock_fini(&mdp5_kms->glob_state_lock); + kfree(mdp5_kms->state); }
@@ -887,6 +970,10 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev) goto fail; }
+ ret = mdp5_global_obj_init(mdp5_kms); + if (ret) + goto fail; + mdp5_kms->mmio = msm_ioremap(pdev, "mdp_phys", "MDP5"); if (IS_ERR(mdp5_kms->mmio)) { ret = PTR_ERR(mdp5_kms->mmio); diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h index 425a03d213e5..76f0ddfca322 100644 --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.h @@ -55,6 +55,13 @@ struct mdp5_kms { struct mdp5_state *state; struct drm_modeset_lock state_lock;
+ /* + * Global private object state, Do not access directly, use + * mdp5_global_get_state() + */ + struct drm_modeset_lock glob_state_lock; + struct drm_private_obj glob_state; + struct mdp5_smp *smp; struct mdp5_ctl_manager *ctlm;
@@ -95,6 +102,24 @@ struct mdp5_state { struct mdp5_state *__must_check mdp5_get_state(struct drm_atomic_state *s);
+/* Global private object state for tracking resources that are shared across + * multiple kms objects (planes/crtcs/etc). + */ +#define to_mdp5_global_state(x) container_of(x, struct mdp5_global_state, base) +struct mdp5_global_state { + struct drm_private_state base; + + struct drm_atomic_state *state; + struct mdp5_kms *mdp5_kms; + + struct mdp5_hw_pipe_state hwpipe; + struct mdp5_hw_mixer_state hwmixer; + struct mdp5_smp_state smp; +}; + +struct mdp5_global_state * mdp5_get_existing_global_state(struct mdp5_kms *mdp5_kms); +struct mdp5_global_state *__must_check mdp5_get_global_state(struct drm_atomic_state *s); + /* Atomic plane state. Subclasses the base drm_plane_state in order to * track assigned hwpipe and hw specific state. */