Re: [ptxdist] mesalib 2021.11 broken kmsro driver?

[Lucas Stach <l.stach@pengutronix.de>]

Am Montag, dem 08.11.2021 um 14:37 +0100 schrieb Christian Melki:
> On 11/8/21 14:03, Michael Olbrich wrote:
> > Hi,
> > 
> > On Mon, Nov 08, 2021 at 11:16:11AM +0100, Christian Melki wrote:
> > > The kmsro driver doesn't seem to create any .so files.
> > > According to people on #dri-devel it's builtin in other .so files?
> > > So the idea of kmsro library names to copy will fail in the current .make.
> > 
> > What exactly is broken?
> 
> ptxdist: error: missing gallium driver armada-drm_dri.so
> 
> > In general, all gallium drivers are built into a
> > single file. 'make install' creates hardlinks for all drivers that are
> > built. In ptxdist we just create one gallium_dri.so and symlinks for all
> > drivers.
> > The 'kmsro' argument for the meson 'gallium-drivers' options just means,
> > build all KMS only drivers. So the list of hardlinks/softlinks ist
> > different. That's why we have the '$(subst kmsro, ....'.
> 
> kmsro doesn't create any library hardlinks named according to whatever
> list ptxdist has. Actually, adding kmsro doesn't change built number of
> objects or generated library hardlinks at all.
> 
> with kmsro:
>         Gallium drivers: kmsro virgl r600 nouveau swrast svga
> 
> [1621/1621] Linking target src/mesa/drivers/dri/libmesa_dri_drivers.so
> 
> $ ls -1gG platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/*
> -rwxr-xr-x  2  94331520 nov  8 14:25
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/i965_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:25
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/kms_swrast_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:25
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/nouveau_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:25
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/r600_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:25
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/swrast_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:25
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/virtio_gpu_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:25
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/vmwgfx_dri.so
> 
> 
> without kmsro:
>         Gallium drivers: virgl r600 nouveau swrast svga
> 
> [1621/1621] Linking target src/mesa/drivers/dri/libmesa_dri_drivers.so
> $ ls -1gG platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/*
> -rwxr-xr-x  2  94331520 nov  8 14:34
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/i965_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:34
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/kms_swrast_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:34
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/nouveau_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:34
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/r600_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:34
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/swrast_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:34
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/virtio_gpu_dri.so
> -rwxr-xr-x 12 127009440 nov  8 14:34
> platform-secplatform/packages/mesa-21.2.3/usr/lib/dri/vmwgfx_dri.so
> 
> .. or something else that's apparently magic is happening.

kmsro just wraps around other drivers that support the render GPU being
different from the scanout GPU. From the list above you have not
enabled any of those drivers (e.g. etnaviv, freedreno, panfrost, ...),
so there isn't anything to wrap around for kmsro, so you don't get any
libraries built.

Regards,
Lucas


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