On Thu, Mar 28, 2019 at 05:13:05PM +0100, Paul Kocialkowski wrote:
> 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>
> Reviewed-by: Eric Anholt <e...@anholt.net>
> ---
> drivers/gpu/drm/drm_file.c | 3 +--
> include/drm/drm_drv.h | 3 ---
> 2 files changed, 1 insertion(+), 5 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) {
If you guys insist on this (still not a fan myself) pls pull it out of
drm_setup - that's all just legacy hw setup in there. I still think
tracking this a bit more accurately (if you want to bother with this)
would be better.
-Daniel
> 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..de5637494503 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -234,9 +234,6 @@ struct drm_driver {
> * kernel driver does not really own the hardware. Instead ownershipe is
> * handled with the help of userspace through an inheritedly racy dance
> * 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.
> */
> void (*lastclose) (struct drm_device *);
>
> --
> 2.21.0
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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