On Fri, Jan 27, 2023 at 11:14:55PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> At the moment, accel drivers can be built-in even with CONFIG_DRM=m,
> but this causes a link failure:
>
> x86_64-linux-ld: drivers/accel/ivpu/ivpu_drv.o: in function `ivpu_dev_init':
> ivpu_drv.c:(.text+0x1535): undefined reference to `drmm_kmalloc'
> x86_64-linux-ld: ivpu_drv.c:(.text+0x1562): undefined reference to `drmm_kmalloc'
> x86_64-linux-ld: drivers/accel/ivpu/ivpu_drv.o: in function `ivpu_remove':
> ivpu_drv.c:(.text+0x1faa): undefined reference to `drm_dev_unregister'
> x86_64-linux-ld: drivers/accel/ivpu/ivpu_drv.o: in function `ivpu_probe':
> ivpu_drv.c:(.text+0x1fef): undefined reference to `__devm_drm_dev_alloc'
>
> The problem is that DRM_ACCEL is a 'bool' symbol symbol, so driver that
> only depend on DRM_ACCEL but not also on DRM do not see the restriction
> to =m configs.
>
> To ensure that each accel driver has an implied dependency on CONFIG_DRM,
> enclose the entire Kconfig file in an if/endif check.
>
> Fixes: 8bf4889762a8 ("drivers/accel: define kconfig and register a new major")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@xxxxxxxxxxxxxxx>
> ---
> v2: rearrage the DRM dependency rather than requiring DRM to be built-in
> ---
> drivers/accel/Kconfig | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/accel/Kconfig b/drivers/accel/Kconfig
> index 834863902e16..c437206aa3f1 100644
> --- a/drivers/accel/Kconfig
> +++ b/drivers/accel/Kconfig
> @@ -6,9 +6,10 @@
> # as, but not limited to, Machine-Learning and Deep-Learning acceleration
> # devices
> #
> +if DRM
> +
> menuconfig DRM_ACCEL
> bool "Compute Acceleration Framework"
> - depends on DRM
> help
> Framework for device drivers of compute acceleration devices, such
> as, but not limited to, Machine-Learning and Deep-Learning
> @@ -25,3 +26,5 @@ menuconfig DRM_ACCEL
>
> source "drivers/accel/habanalabs/Kconfig"
> source "drivers/accel/ivpu/Kconfig"
> +
> +endif
> --
> 2.39.0
>
