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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