On Tue, Mar 06, 2018 at 08:29:20AM +0100, Daniel Vetter wrote:
> On Wed, Feb 21, 2018 at 04:19:40PM +0100, Maarten Lankhorst wrote:
> > Hey,
> >
> > Op 21-02-18 om 15:37 schreef Rob Clark:
> > > Follow the same pattern of locking as with other state objects. This
> > > avoids boilerplate in the driver.
> > I'm afraid this will prohibit any uses of this on i915, since it still uses legacy lock_all().
> >
> > Oh well, afaict nothing in i915 uses private objects, so I don't think it's harmful. :)
>
> We do use private objects, as part of dp mst helpers. But I also thought
> that the only users left of lock_all are in the debugfs code, where this
> really doesn't matter all that much.
Correction, we use it in other places than debugfs. But thanks to Ville's
private state obj refactoring we now have drm_atomic_private_obj_init(),
so it's easy to add all the private state objects to a new list in
drm_dev->mode_config.private_states or so, and use that list in
drm_modeset_lock_all_ctx to also take driver private locks.
I think that would actually be useful in other places, just in case.
-Daniel
>
> > Could you cc intel-gfx just in case?
>
> Yeah, best to double-check with CI.
>
> > > Signed-off-by: Rob Clark <robdclark@xxxxxxxxx>
> > > ---
> > > 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.
> > > */
> >
> >
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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