Am Di., 12. Feb. 2019 um 15:16 Uhr schrieb Daniel Vetter <daniel@xxxxxxxx>:
>
> On Fri, Feb 08, 2019 at 08:23:44AM +0100, Christian Gmeiner wrote:
> > Am Sa., 2. Feb. 2019 um 16:42 Uhr schrieb Rob Herring <robh@xxxxxxxxxx>:
> > >
> > > Many users of drm_gem_object embed a struct reservation_object into
> > > their subclassed struct, so let's add one to struct drm_gem_object.
> > > This will allow removing the reservation object from the subclasses
> > > and removing the ->gem_prime_res_obj callback.
> > >
> > > With the addition, add a drm_gem_reservation_object_wait() helper
> > > function for drivers to use in wait ioctls.
> > >
> > > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> > > Cc: Maxime Ripard <maxime.ripard@xxxxxxxxxxx>
> > > Cc: Sean Paul <sean@xxxxxxxxxx>
> > > Cc: David Airlie <airlied@xxxxxxxx>
> > > Cc: Daniel Vetter <daniel@xxxxxxxx>
> > > Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
> >
> > Reviewed-by: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
>
> Does this extend to 2/5 to update etnaviv?
oopps... yes it does - see my reply to 2/5.
> -Daniel
>
> >
> > > ---
> > > v2:
> > > - Fix missing kerneldoc
> > > - Reword todo with what is left todo.
> > > - Fix timeout error handling (added to drm_gem_reservation_object_wait)
> > >
> > > Documentation/gpu/todo.rst | 8 +++----
> > > drivers/gpu/drm/drm_gem.c | 43 +++++++++++++++++++++++++++++++++++++
> > > drivers/gpu/drm/drm_prime.c | 1 +
> > > include/drm/drm_gem.h | 21 ++++++++++++++++++
> > > 4 files changed, 69 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
> > > index 14191b64446d..c9ed55605641 100644
> > > --- a/Documentation/gpu/todo.rst
> > > +++ b/Documentation/gpu/todo.rst
> > > @@ -209,12 +209,12 @@ Would be great to refactor this all into a set of small common helpers.
> > >
> > > Contact: Daniel Vetter
> > >
> > > -Put a reservation_object into drm_gem_object
> > > +Remove the ->gem_prime_res_obj callback
> > > --------------------------------------------
> > >
> > > -This would remove the need for the ->gem_prime_res_obj callback. It would also
> > > -allow us to implement generic helpers for waiting for a bo, allowing for quite a
> > > -bit of refactoring in the various wait ioctl implementations.
> > > +The ->gem_prime_res_obj callback can be removed from drivers by using the
> > > +reservation_object in the drm_gem_object. It may also be possible to use the
> > > +generic drm_gem_reservation_object_wait helper for waiting for a bo.
> > >
> > > Contact: Daniel Vetter
> > >
> > > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> > > index 8b55ece97967..b09acbc5a655 100644
> > > --- a/drivers/gpu/drm/drm_gem.c
> > > +++ b/drivers/gpu/drm/drm_gem.c
> > > @@ -170,6 +170,10 @@ void drm_gem_private_object_init(struct drm_device *dev,
> > > kref_init(&obj->refcount);
> > > obj->handle_count = 0;
> > > obj->size = size;
> > > + reservation_object_init(&obj->_resv);
> > > + if (!obj->resv)
> > > + obj->resv = &obj->_resv;
> > > +
> > > drm_vma_node_reset(&obj->vma_node);
> > > }
> > > EXPORT_SYMBOL(drm_gem_private_object_init);
> > > @@ -657,6 +661,44 @@ drm_gem_object_lookup(struct drm_file *filp, u32 handle)
> > > }
> > > EXPORT_SYMBOL(drm_gem_object_lookup);
> > >
> > > +/**
> > > + * drm_gem_reservation_object_wait - Wait on GEM object's reservation's objects
> > > + * shared and/or exclusive fences.
> > > + * @filep: DRM file private date
> > > + * @handle: userspace handle
> > > + * @wait_all: if true, wait on all fences, else wait on just exclusive fence
> > > + * @timeout: timeout value in jiffies or zero to return immediately
> > > + *
> > > + * Returns:
> > > + *
> > > + * Returns -ERESTARTSYS if interrupted, 0 if the wait timed out, or
> > > + * greater than 0 on success.
> > > + */
> > > +long drm_gem_reservation_object_wait(struct drm_file *filep, u32 handle,
> > > + bool wait_all, unsigned long timeout)
> > > +{
> > > + long ret;
> > > + struct drm_gem_object *obj;
> > > +
> > > + obj = drm_gem_object_lookup(filep, handle);
> > > + if (!obj) {
> > > + DRM_DEBUG("Failed to look up GEM BO %d\n", handle);
> > > + return -EINVAL;
> > > + }
> > > +
> > > + ret = reservation_object_wait_timeout_rcu(obj->resv, wait_all,
> > > + true, timeout);
> > > + if (ret == 0)
> > > + ret = -ETIME;
> > > + else if (ret > 0)
> > > + ret = 0;
> > > +
> > > + drm_gem_object_put_unlocked(obj);
> > > +
> > > + return ret;
> > > +}
> > > +EXPORT_SYMBOL(drm_gem_reservation_object_wait);
> > > +
> > > /**
> > > * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl
> > > * @dev: drm_device
> > > @@ -821,6 +863,7 @@ drm_gem_object_release(struct drm_gem_object *obj)
> > > if (obj->filp)
> > > fput(obj->filp);
> > >
> > > + reservation_object_fini(&obj->_resv);
> > > drm_gem_free_mmap_offset(obj);
> > > }
> > > EXPORT_SYMBOL(drm_gem_object_release);
> > > diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> > > index 231e3f6d5f41..dc079efb3b0f 100644
> > > --- a/drivers/gpu/drm/drm_prime.c
> > > +++ b/drivers/gpu/drm/drm_prime.c
> > > @@ -504,6 +504,7 @@ struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
> > > .size = obj->size,
> > > .flags = flags,
> > > .priv = obj,
> > > + .resv = obj->resv,
> > > };
> > >
> > > if (dev->driver->gem_prime_res_obj)
> > > diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
> > > index c95727425284..25f1ff2df464 100644
> > > --- a/include/drm/drm_gem.h
> > > +++ b/include/drm/drm_gem.h
> > > @@ -35,6 +35,7 @@
> > > */
> > >
> > > #include <linux/kref.h>
> > > +#include <linux/reservation.h>
> > >
> > > #include <drm/drm_vma_manager.h>
> > >
> > > @@ -262,6 +263,24 @@ struct drm_gem_object {
> > > */
> > > struct dma_buf_attachment *import_attach;
> > >
> > > + /**
> > > + * @resv:
> > > + *
> > > + * Pointer to reservation object associated with the this GEM object.
> > > + *
> > > + * Normally (@resv == &@_resv) except for imported GEM objects.
> > > + */
> > > + struct reservation_object *resv;
> > > +
> > > + /**
> > > + * @_resv:
> > > + *
> > > + * A reservation object for this GEM object.
> > > + *
> > > + * This is unused for imported GEM objects.
> > > + */
> > > + struct reservation_object _resv;
> > > +
> > > /**
> > > * @funcs:
> > > *
> > > @@ -363,6 +382,8 @@ void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
> > > bool dirty, bool accessed);
> > >
> > > struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle);
> > > +long drm_gem_reservation_object_wait(struct drm_file *filep, u32 handle,
> > > + bool wait_all, unsigned long timeout);
> > > int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
> > > u32 handle, u64 *offset);
> > > int drm_gem_dumb_destroy(struct drm_file *file,
> > > --
> > > 2.19.1
> > >
> >
> >
> > --
> > greets
> > --
> > Christian Gmeiner, MSc
> >
> > https://christian-gmeiner.info
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
--
greets
--
Christian Gmeiner, MSc
https://christian-gmeiner.info
