Commit b962a120 authored by Rob Clark's avatar Rob Clark Committed by Boris Brezillon

drm/atomic: integrate modeset lock with private objects

Follow the same pattern of locking as with other state objects. This
avoids boilerplate in the driver.
Signed-off-by: default avatarRob Clark <robdclark@gmail.com>
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20181022123122.30468-1-boris.brezillon@bootlin.com
parent cb8ce711
......@@ -676,6 +676,7 @@ 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
......@@ -685,14 +686,18 @@ 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);
......@@ -705,7 +710,9 @@ 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);
......@@ -715,8 +722,8 @@ 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:
*
......@@ -726,7 +733,7 @@ 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;
......@@ -735,6 +742,10 @@ 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);
......
......@@ -3221,7 +3221,7 @@ 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);
......
......@@ -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);
......
......@@ -22,6 +22,7 @@
*/
#include <drm/drmP.h>
#include <drm/drm_atomic.h>
#include <drm/drm_crtc.h>
#include <drm/drm_modeset_lock.h>
......@@ -394,6 +395,7 @@ 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;
......@@ -414,6 +416,12 @@ 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);
......@@ -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;
......
......@@ -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;
......
......@@ -432,7 +432,8 @@ 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);
......
......@@ -228,8 +228,30 @@ 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.
*/
......@@ -244,6 +266,18 @@ 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
......@@ -400,7 +434,8 @@ 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);
......
......@@ -512,6 +512,15 @@ 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;
......
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