From: Rob Clark <robdclark@xxxxxxxxx> Follow the same pattern of locking as with other state objects. This avoids boilerplate in the driver. Signed-off-by: Rob Clark <robdclark@xxxxxxxxx> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx> Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx> --- Changes in v3: - Improve doc as suggested by Daniel - Add Daniel's R-b Changes in v2: - Make sure all priv objs are locked from drm_modeset_lock_all_ctx(). This implies adding all priv objs to mode_config.privobj_list, and in turn means we have to change the drm_atomic_private_obj_init() prototype and pass it a drm_device. --- drivers/gpu/drm/drm_atomic.c | 19 +++++++++--- drivers/gpu/drm/drm_dp_mst_topology.c | 2 +- drivers/gpu/drm/drm_mode_config.c | 1 + drivers/gpu/drm/drm_modeset_lock.c | 8 +++++ drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 2 +- drivers/gpu/drm/tegra/hub.c | 2 +- drivers/gpu/drm/vc4/vc4_kms.c | 3 +- include/drm/drm_atomic.h | 37 +++++++++++++++++++++++- include/drm/drm_mode_config.h | 9 ++++++ 9 files changed, 74 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 2870ae205237..0e27d45feba9 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -657,6 +657,7 @@ static void drm_atomic_plane_print_state(struct drm_printer *p, /** * drm_atomic_private_obj_init - initialize private object + * @dev: DRM device this object will be attached to * @obj: private object * @state: initial private object state * @funcs: pointer to the struct of function pointers that identify the object @@ -666,14 +667,18 @@ static void drm_atomic_plane_print_state(struct drm_printer *p, * driver private object that needs its own atomic state. */ void -drm_atomic_private_obj_init(struct drm_private_obj *obj, +drm_atomic_private_obj_init(struct drm_device *dev, + struct drm_private_obj *obj, struct drm_private_state *state, const struct drm_private_state_funcs *funcs) { memset(obj, 0, sizeof(*obj)); + drm_modeset_lock_init(&obj->lock); + obj->state = state; obj->funcs = funcs; + list_add_tail(&obj->head, &dev->mode_config.privobj_list); } EXPORT_SYMBOL(drm_atomic_private_obj_init); @@ -686,7 +691,9 @@ EXPORT_SYMBOL(drm_atomic_private_obj_init); void drm_atomic_private_obj_fini(struct drm_private_obj *obj) { + list_del(&obj->head); obj->funcs->atomic_destroy_state(obj, obj->state); + drm_modeset_lock_fini(&obj->lock); } EXPORT_SYMBOL(drm_atomic_private_obj_fini); @@ -696,8 +703,8 @@ EXPORT_SYMBOL(drm_atomic_private_obj_fini); * @obj: private object to get the state for * * This function returns the private object state for the given private object, - * allocating the state if needed. It does not grab any locks as the caller is - * expected to care of any required locking. + * allocating the state if needed. It will also grab the relevant private + * object lock to make sure that the state is consistent. * * RETURNS: * @@ -707,7 +714,7 @@ struct drm_private_state * drm_atomic_get_private_obj_state(struct drm_atomic_state *state, struct drm_private_obj *obj) { - int index, num_objs, i; + int index, num_objs, i, ret; size_t size; struct __drm_private_objs_state *arr; struct drm_private_state *obj_state; @@ -716,6 +723,10 @@ drm_atomic_get_private_obj_state(struct drm_atomic_state *state, if (obj == state->private_objs[i].ptr) return state->private_objs[i].state; + ret = drm_modeset_lock(&obj->lock, state->acquire_ctx); + if (ret) + return ERR_PTR(ret); + num_objs = state->num_private_objs + 1; size = sizeof(*state->private_objs) * num_objs; arr = krealloc(state->private_objs, size, GFP_KERNEL); diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 5ff1d79b86c4..0ab47cd44a20 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -3210,7 +3210,7 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, /* max. time slots - one slot for MTP header */ mst_state->avail_slots = 63; - drm_atomic_private_obj_init(&mgr->base, + drm_atomic_private_obj_init(dev, &mgr->base, &mst_state->base, &mst_state_funcs); diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c index ee80788f2c40..931523c5bc9d 100644 --- a/drivers/gpu/drm/drm_mode_config.c +++ b/drivers/gpu/drm/drm_mode_config.c @@ -381,6 +381,7 @@ void drm_mode_config_init(struct drm_device *dev) INIT_LIST_HEAD(&dev->mode_config.property_list); INIT_LIST_HEAD(&dev->mode_config.property_blob_list); INIT_LIST_HEAD(&dev->mode_config.plane_list); + INIT_LIST_HEAD(&dev->mode_config.privobj_list); idr_init(&dev->mode_config.crtc_idr); idr_init(&dev->mode_config.tile_idr); ida_init(&dev->mode_config.connector_ida); diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c index 8a5100685875..088be2e3c399 100644 --- a/drivers/gpu/drm/drm_modeset_lock.c +++ b/drivers/gpu/drm/drm_modeset_lock.c @@ -22,6 +22,7 @@ */ #include <drm/drmP.h> +#include <drm/drm_atomic.h> #include <drm/drm_crtc.h> #include <drm/drm_modeset_lock.h> @@ -388,6 +389,7 @@ EXPORT_SYMBOL(drm_modeset_unlock); int drm_modeset_lock_all_ctx(struct drm_device *dev, struct drm_modeset_acquire_ctx *ctx) { + struct drm_private_obj *privobj; struct drm_crtc *crtc; struct drm_plane *plane; int ret; @@ -408,6 +410,12 @@ int drm_modeset_lock_all_ctx(struct drm_device *dev, return ret; } + drm_for_each_privobj(privobj, dev) { + ret = drm_modeset_lock(&privobj->lock, ctx); + if (ret) + return ret; + } + return 0; } EXPORT_SYMBOL(drm_modeset_lock_all_ctx); diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c index bddd625ab91b..f71d8cf2261b 100644 --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c @@ -144,7 +144,7 @@ static int mdp5_global_obj_init(struct mdp5_kms *mdp5_kms) state->mdp5_kms = mdp5_kms; - drm_atomic_private_obj_init(&mdp5_kms->glob_state, + drm_atomic_private_obj_init(mdp5_kms->dev, &mdp5_kms->glob_state, &state->base, &mdp5_global_state_funcs); return 0; diff --git a/drivers/gpu/drm/tegra/hub.c b/drivers/gpu/drm/tegra/hub.c index 8f4fcbb515fb..20c44b412148 100644 --- a/drivers/gpu/drm/tegra/hub.c +++ b/drivers/gpu/drm/tegra/hub.c @@ -716,7 +716,7 @@ static int tegra_display_hub_init(struct host1x_client *client) if (!state) return -ENOMEM; - drm_atomic_private_obj_init(&hub->base, &state->base, + drm_atomic_private_obj_init(drm, &hub->base, &state->base, &tegra_display_hub_state_funcs); tegra->hub = hub; diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c index 127468785f74..5c9823ccb3f8 100644 --- a/drivers/gpu/drm/vc4/vc4_kms.c +++ b/drivers/gpu/drm/vc4/vc4_kms.c @@ -426,7 +426,8 @@ int vc4_kms_load(struct drm_device *dev) ctm_state = kzalloc(sizeof(*ctm_state), GFP_KERNEL); if (!ctm_state) return -ENOMEM; - drm_atomic_private_obj_init(&vc4->ctm_manager, &ctm_state->base, + + drm_atomic_private_obj_init(dev, &vc4->ctm_manager, &ctm_state->base, &vc4_ctm_state_funcs); drm_mode_config_reset(dev); diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h index c09ecaf43825..afaa8a65049e 100644 --- a/include/drm/drm_atomic.h +++ b/include/drm/drm_atomic.h @@ -217,8 +217,30 @@ struct drm_private_state_funcs { * Currently only tracks the state update functions and the opaque driver * private state itself, but in the future might also track which * &drm_modeset_lock is required to duplicate and update this object's state. + * + * All private objects must be initialized before the DRM device they are + * attached to is registered to the DRM subsystem (call to drm_dev_register()) + * and should stay around until this DRM device is unregistered (call to + * drm_dev_unregister()). In other words, private objects lifetime is tied + * to the DRM device lifetime. This implies that: + * + * 1/ all calls to drm_atomic_private_obj_init() must be done before calling + * drm_dev_register() + * 2/ all calls to drm_atomic_private_obj_fini() must be done after calling + * drm_dev_unregister() */ struct drm_private_obj { + /** + * @head: List entry used to attach a private object to a &drm_device + * (queued to &drm_mode_config.privobj_list). + */ + struct list_head head; + + /** + * @lock: Modeset lock to protect the state object. + */ + struct drm_modeset_lock lock; + /** * @state: Current atomic state for this driver private object. */ @@ -233,6 +255,18 @@ struct drm_private_obj { const struct drm_private_state_funcs *funcs; }; +/** + * drm_for_each_privobj() - private object iterator + * + * @privobj: pointer to the current private object. Updated after each + * iteration + * @dev: the DRM device we want get private objects from + * + * Allows one to iterate over all private objects attached to @dev + */ +#define drm_for_each_privobj(privobj, dev) \ + list_for_each_entry(privobj, &(dev)->mode_config.privobj_list, head) + /** * struct drm_private_state - base struct for driver private object state * @state: backpointer to global drm_atomic_state @@ -389,7 +423,8 @@ struct drm_connector_state * __must_check drm_atomic_get_connector_state(struct drm_atomic_state *state, struct drm_connector *connector); -void drm_atomic_private_obj_init(struct drm_private_obj *obj, +void drm_atomic_private_obj_init(struct drm_device *dev, + struct drm_private_obj *obj, struct drm_private_state *state, const struct drm_private_state_funcs *funcs); void drm_atomic_private_obj_fini(struct drm_private_obj *obj); diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h index 928e4172a0bb..93a775b0ca5d 100644 --- a/include/drm/drm_mode_config.h +++ b/include/drm/drm_mode_config.h @@ -506,6 +506,15 @@ struct drm_mode_config { */ struct list_head property_list; + /** + * @privobj_list: + * + * List of private objects linked with &drm_private_obj.head. This is + * invariant over the lifetime of a device and hence doesn't need any + * locks. + */ + struct list_head privobj_list; + int min_width, min_height; int max_width, max_height; const struct drm_mode_config_funcs *funcs; -- 2.17.1 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel