On Thu, Oct 24, 2019 at 12:40:19PM +0100, Chris Wilson wrote: > We would like some freedom to break the user API/ABI for future HW but > yet still expose the driver for upstream development on that HW. > Currently, we have the i915.force_probe module parameter to avoid binding > to HW while the driver is under development, but that is still a little > too soft with respect to the stringent no-regression rules if we also > plan to be redesigning the uAPI to go along with the new HW. > > To allow the uAPI to be changed during development, only expose that API > and in development HW under STAGING (and BROKEN). Hopefully, making it > explicit that such interfaces to that HW are under development and not > to be blindly enabled by distributions. > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> > Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > Cc: Jani Nikula <jani.nikula@xxxxxxxxx> > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > Cc: Dave Airlie <airlied@xxxxxxxxxx> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > --- > drivers/gpu/drm/i915/Kconfig | 8 ++++++++ > drivers/gpu/drm/i915/Kconfig.debug | 1 + > drivers/gpu/drm/i915/Kconfig.unstable | 20 ++++++++++++++++++++ > 3 files changed, 29 insertions(+) > create mode 100644 drivers/gpu/drm/i915/Kconfig.unstable > > diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig > index 3c6d57df262d..1fd9e665b742 100644 > --- a/drivers/gpu/drm/i915/Kconfig > +++ b/drivers/gpu/drm/i915/Kconfig > @@ -148,3 +148,11 @@ menu "drm/i915 Profile Guided Optimisation" > depends on DRM_I915 > source "drivers/gpu/drm/i915/Kconfig.profile" > endmenu > + > +menu "drm/i915 Ustable Evolution" > + visible if EXPERT > + visible if STAGING > + visible if BROKEN > + depends on DRM_I915 > + source "drivers/gpu/drm/i915/Kconfig.unstable" > +endmenu > diff --git a/drivers/gpu/drm/i915/Kconfig.debug b/drivers/gpu/drm/i915/Kconfig.debug > index d2ba8f7e5e50..ef123eb29168 100644 > --- a/drivers/gpu/drm/i915/Kconfig.debug > +++ b/drivers/gpu/drm/i915/Kconfig.debug > @@ -44,6 +44,7 @@ config DRM_I915_DEBUG > select DRM_I915_SELFTEST > select DRM_I915_DEBUG_RUNTIME_PM > select DRM_I915_DEBUG_MMIO > + select BROKEN # for prototype uAPI > default n > help > Choose this option to turn on extra driver debugging that may affect > diff --git a/drivers/gpu/drm/i915/Kconfig.unstable b/drivers/gpu/drm/i915/Kconfig.unstable > new file mode 100644 > index 000000000000..ecc8458b5a32 > --- /dev/null > +++ b/drivers/gpu/drm/i915/Kconfig.unstable > @@ -0,0 +1,20 @@ > +# SPDX-License-Identifier: GPL-2.0-only > +config DRM_I915_UNSTABLE > + bool "Enable unstable API for early prototype development" > + depends on EXPERT > + depends on STAGING > + depends on BROKEN # should never be enabled by distros! > + # We use the dependency on !COMPILE_TEST to not be enabled in > + # allmodconfig or allyesconfig configurations > + depends on !COMPILE_TEST > + default n > + help > + Enable prototype uAPI under general discussion before they are > + finalized. Such prototypes may be withdrawn or substantially > + changed before release. They are only enabled here so that a wide > + number of interested parties (userspace driver developers) can > + verify that the uAPI meet their expectations. > + > + Recommended for driver developers _only_. > + > + If in the slightest bit of doubt, say "N". > -- > 2.24.0.rc0 > _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
