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drm/i915: Put future HW and their uAPIs under STAGING & BROKEN

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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@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191027154314.11139-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-10-27 15:43:14 +00:00
parent 3fc794f27f
commit d9d54a530a
3 changed files with 28 additions and 0 deletions
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6
drivers/gpu/drm/i915/Kconfig
View file

@ -148,3 +148,9 @@ menu "drm/i915 Profile Guided Optimisation"
depends on DRM_I915
source "drivers/gpu/drm/i915/Kconfig.profile"
endmenu
menu "drm/i915 Unstable Evolution"
visible if EXPERT && STAGING && BROKEN
depends on DRM_I915
source "drivers/gpu/drm/i915/Kconfig.unstable"
endmenu

1
drivers/gpu/drm/i915/Kconfig.debug
View file

@ -36,6 +36,7 @@ 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

21
drivers/gpu/drm/i915/Kconfig.unstable Normal file
View file

@ -0,0 +1,21 @@
# 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. These uAPI should
never be used in production.
Recommended for driver developers _only_.
If in the slightest bit of doubt, say "N".