Paul Kocialkowski <paul.kocialkow...@bootlin.com> writes: > The firstopen DRM driver hook was initially used to perform hardware > initialization, which is now considered legacy. Only a single user of > firstopen remains at this point (savage). > > In some specific cases, non-legacy drivers may also need to implement > these hooks. For instance on VC4, we need to allocate a 16 MiB buffer > for the GPU. Because it's not required for fbcon, it's a waste to > allocate it before userspace starts using the DRM device. > > Using firstopen and lastclose for this allocation seems like the best > fit, so re-habilitate the hook to allow it to be called for non-legacy > drivers. > > Signed-off-by: Paul Kocialkowski <paul.kocialkow...@bootlin.com> > --- > drivers/gpu/drm/drm_file.c | 3 +-- > include/drm/drm_drv.h | 2 +- > 2 files changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c > index b1838a41ad43..c011b5cbfb6b 100644 > --- a/drivers/gpu/drm/drm_file.c > +++ b/drivers/gpu/drm/drm_file.c > @@ -266,8 +266,7 @@ static int drm_setup(struct drm_device * dev) > { > int ret; > > - if (dev->driver->firstopen && > - drm_core_check_feature(dev, DRIVER_LEGACY)) { > + if (dev->driver->firstopen) { > ret = dev->driver->firstopen(dev); > if (ret != 0) > return ret; > diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h > index ca46a45a9cce..aa14607e54d4 100644 > --- a/include/drm/drm_drv.h > +++ b/include/drm/drm_drv.h > @@ -236,7 +236,7 @@ struct drm_driver { > * to set/unset the VT into raw mode. > * > * Legacy drivers initialize the hardware in the @firstopen callback, > - * which isn't even called for modern drivers. > + * modern drivers can use it for other purposes only. > */ > void (*lastclose) (struct drm_device *);
Our usage in vc4 is not very different from what we called "hardware initialization" in other devices. I would rather just delete this sentence entirely. The only alternative I can think of to using a firstopen/lastclose-style allocation for this would be to allocate the bin bo on the first (non-dumb?) V3D BO allocation and refcount those to free the binner.
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