On Wed, Feb 21, 2018 at 09:37:21AM -0500, Rob Clark wrote:
> Follow the same pattern of locking as with other state objects. This
> avoids boilerplate in the driver.
>
> Signed-off-by: Rob Clark <robdcl...@gmail.com>
Please also adjust the kernel doc, and I think we can remove the locking
WARN_ON in drm_atomic_get_mst_topology_state after this patch (plus again
adjust the kerneldoc for that please).
Otherwise I think this makes sense, and ecnourages reasonable semantics
for driver private state objects.
-Daniel
> ---
> drivers/gpu/drm/drm_atomic.c | 9 ++++++++-
> include/drm/drm_atomic.h | 5 +++++
> 2 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index fc8c4da409ff..004e621ab307 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1078,6 +1078,8 @@ drm_atomic_private_obj_init(struct drm_private_obj *obj,
> {
> memset(obj, 0, sizeof(*obj));
>
> + drm_modeset_lock_init(&obj->lock);
> +
> obj->state = state;
> obj->funcs = funcs;
> }
> @@ -1093,6 +1095,7 @@ void
> drm_atomic_private_obj_fini(struct drm_private_obj *obj)
> {
> obj->funcs->atomic_destroy_state(obj, obj->state);
> + drm_modeset_lock_fini(&obj->lock);
> }
> EXPORT_SYMBOL(drm_atomic_private_obj_fini);
>
> @@ -1113,7 +1116,7 @@ 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;
> @@ -1122,6 +1125,10 @@ 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/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
> index 09076a625637..9ae53b73c9d2 100644
> --- a/include/drm/drm_atomic.h
> +++ b/include/drm/drm_atomic.h
> @@ -218,6 +218,11 @@ struct drm_private_state_funcs {
> * &drm_modeset_lock is required to duplicate and update this object's state.
> */
> struct drm_private_obj {
> + /**
> + * @lock: Modeset lock to protect the state object.
> + */
> + struct drm_modeset_lock lock;
> +
> /**
> * @state: Current atomic state for this driver private object.
> */
> --
> 2.14.3
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
