Cannot use VAAPI on headless amdgpu devices

[agrajag9]

Describe the bug
VAAPI calls may never return if there's no display attached. This is at least true for the WX 2100.

There's an option in amdgpu_drv.c but I wasn't able to get it working.

FreeBSD version
stable/13-n248443-c89c8b894cf GENERIC amd64

PCI Info

pciconf -lv

vgapci0@pci0:3:0:0:     class=0x030000 rev=0x00 hdr=0x00 vendor=0x1002 device=0x6995 subvendor=0x1028 subdevice=0x0b0c
    vendor     = 'Advanced Micro Devices, Inc. [AMD/ATI]'
    device     = 'Lexa XT [Radeon PRO WX 2100]'
    class      = display
    subclass   = VGA

DRM KMOD version

drm-fbsd13-kmod 5.4.144.g20211013
drm-kmod g20190710_1

To Reproduce

1. Detach all displays from amdgpu device
2. Run LIBVA_TRACE=1 LIBVA_DRIVER_NAME=radeonsi vainfo

[valpackett]

There's an option in amdgpu_drv.c but I wasn't able to get it working.

It's under #ifdef __linux__ so we don't have it.

I have no idea why that is the case, this was added in a really old commit and nothing that actually reads the value is ifdef'd, it's literally only the sysctl itself.

Please do try removing the ifdef and using the functionality.

[valpackett]

With https://reviews.freebsd.org/D34248 + https://reviews.freebsd.org/D34252 + #146 it will work.

[agrajag9]

Wonderful! Sorry for not trying the quick fix on my end, both $HOME and $WORK have been oversaturated with more important stuff, but glad to see we've gotten there anyways!