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drm: drop modeset_lock_all from drm_state_info 

If we push the locks down we don't have to take them all at the same
time.

Aside: Making dump_info fully safe should be fairly simple, if we
protect the ->state pointers with rcu. Simply putting a
synchronize_rcu() into the drm_atomic_state free function should be
all that's roughly needed. Well except we shouldn't block in there, so
better to put that into a work_struct. But I've not set out to fix
that little issue.

Cc: Rob Clark <robdclark@gmail.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170403083304.9083-6-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2017-04-03 10:32:54 +02:00
parent a5b8444e28
commit c2d855649e
1 changed files with 40 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/gpu/drm/drm_atomic.c
View File

@ -1676,6 +1676,44 @@ static void drm_atomic_print_state(const struct drm_atomic_state *state)
drm_atomic_connector_print_state(&p, connector_state);
}
static void __drm_state_dump(struct drm_device *dev, struct drm_printer *p,
bool take_locks)
{
struct drm_mode_config *config = &dev->mode_config;
struct drm_plane *plane;
struct drm_crtc *crtc;
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
return;
list_for_each_entry(plane, &config->plane_list, head) {
if (take_locks)
drm_modeset_lock(&plane->mutex, NULL);
drm_atomic_plane_print_state(p, plane->state);
if (take_locks)
drm_modeset_unlock(&plane->mutex);
}
list_for_each_entry(crtc, &config->crtc_list, head) {
if (take_locks)
drm_modeset_lock(&crtc->mutex, NULL);
drm_atomic_crtc_print_state(p, crtc->state);
if (take_locks)
drm_modeset_unlock(&crtc->mutex);
}
drm_connector_list_iter_begin(dev, &conn_iter);
if (take_locks)
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
drm_for_each_connector_iter(connector, &conn_iter)
drm_atomic_connector_print_state(p, connector->state);
if (take_locks)
drm_modeset_unlock(&dev->mode_config.connection_mutex);
drm_connector_list_iter_end(&conn_iter);
}
/**
* drm_state_dump - dump entire device atomic state
* @dev: the drm device
@ -1693,25 +1731,7 @@ static void drm_atomic_print_state(const struct drm_atomic_state *state)
*/
void drm_state_dump(struct drm_device *dev, struct drm_printer *p)
{
struct drm_mode_config *config = &dev->mode_config;
struct drm_plane *plane;
struct drm_crtc *crtc;
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
return;
list_for_each_entry(plane, &config->plane_list, head)
drm_atomic_plane_print_state(p, plane->state);
list_for_each_entry(crtc, &config->crtc_list, head)
drm_atomic_crtc_print_state(p, crtc->state);
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter)
drm_atomic_connector_print_state(p, connector->state);
drm_connector_list_iter_end(&conn_iter);
__drm_state_dump(dev, p, false);
}
EXPORT_SYMBOL(drm_state_dump);
@ -1722,9 +1742,7 @@ static int drm_state_info(struct seq_file *m, void *data)
struct drm_device *dev = node->minor->dev;
struct drm_printer p = drm_seq_file_printer(m);
drm_modeset_lock_all(dev);
drm_state_dump(dev, &p);
drm_modeset_unlock_all(dev);
__drm_state_dump(dev, &p, true);
return 0;
}