Re: RPi4 issue with DRM_RENDER_ALLOW

It’s been a while for me, but you might check if you have an issue with
permissions. A quick check would be to see if glxgears works when run as
root.

Hi all!
>
> The last days I've been struggling with mesa3d to get GPU acceleration
> on X, on my Raspberry Pi 4 Model B. Maybe someone knows how to deal with
> it.
>
> Using Buildroot I've compiled a system with mesa3d, using KMSRO, V3D and
> VC4 Gallium drivers. X11 is starting up, stating that DRI is initialised
> and everything seems to work. But when I run glxinfo or glxgears, it is
> stating 'Failed to open bo 1: Permission denied'. glxgears opens a
> window which simply stays black. So I started to track it down and ended
> up in drivers/drm/drm_ioctl.c.
>
> The specific function that returns EACCES (-13) is drm_ioctl_permit().
> To identify the failing condition I've added some DRM_DEBUG() for each
> one of the four condition there. After enabling drm.debug with
>
> # echo 0xf > /sys/module/drm/parameters/debug
>
> I see that it fails on the DRM_RENDER_ALLOW condition. I don't know how
> this all works together and what it means, in detail. So I'm lost now. I
> assume that X11 is occupying the exclusive access to the render node
> /dev/dri/renderD128. But how does glxgears should work now? What I'm
> trying to archive is to run chromium with GPU acceleration, but the GPU
> process is crashing and reverts to software rendering.
>
> When running glxinfo it is showing all the renderer information, which
> looks good, though it shows that permission denied too. All programs are
> running as root at the moment and the filesystem permissions look good.
>
> As I said, I'm lost and don't know that much about all this to go any
> further, so I'm stuck at it now. I hope someone here got the missing
> piece for me to get it working, though I'm not sure wether it is the
> right place for this question. May be it's related to kernel
> configuration, to the Raspberry firmware, or what so ever. But I even
> don't know that.
>
> Software used:
>
> Mesa3D 20.3.4
> Linux 5.10.y (branch at github.com/raspberrypi/linux)
> Firmware stable (branch at github.com/raspberrypi/firmware)
>
> Thank you in advance. Further down you will find some output from strace
> and drm.debug.
>
> Best regards,
>
> Michael
>
> ==== strace of glxgears
> openat(AT_FDCWD, "/dev/dri/renderD128", O_RDWR|O_LARGEFILE|O_CLOEXEC) = 6
> ioctl(6, DRM_IOCTL_VERSION, 0x15084e0)  = 0
> ioctl(6, DRM_IOCTL_VERSION, 0x15084e0)  = 0
> ioctl(6, DRM_IOCTL_GET_UNIQUE, 0xbedebcd0) = -1 EACCES (Permission denied)
> ioctl(6, DRM_IOCTL_EXYNOS_GEM_GET or DRM_IOCTL_PANFROST_GET_PARAM or
> DRM_IOCTL_QXL_GETPARAM or DRM_IOCTL_SIS_FB_ALLOC or
> DRM_IOCTL_TEGRA_SYNCPT_WAIT or DRM_IOCTL_V3D_GET_PARAM or
> DRM_IOCTL_VC4_MMAP_BO, 0xbedebf00) = 0
> ioctl(6, DRM_IOCTL_EXYNOS_GEM_GET or DRM_IOCTL_PANFROST_GET_PARAM or
> DRM_IOCTL_QXL_GETPARAM or DRM_IOCTL_SIS_FB_ALLOC or
> DRM_IOCTL_TEGRA_SYNCPT_WAIT or DRM_IOCTL_V3D_GET_PARAM or
> DRM_IOCTL_VC4_MMAP_BO, 0xbedebf10) = 0
> ioctl(6, DRM_IOCTL_EXYNOS_GEM_GET or DRM_IOCTL_PANFROST_GET_PARAM or
> DRM_IOCTL_QXL_GETPARAM or DRM_IOCTL_SIS_FB_ALLOC or
> DRM_IOCTL_TEGRA_SYNCPT_WAIT or DRM_IOCTL_V3D_GET_PARAM or
> DRM_IOCTL_VC4_MMAP_BO, 0xbedebf28) = 0
> ioctl(6, DRM_IOCTL_EXYNOS_GEM_GET or DRM_IOCTL_PANFROST_GET_PARAM or
> DRM_IOCTL_QXL_GETPARAM or DRM_IOCTL_SIS_FB_ALLOC or
> DRM_IOCTL_TEGRA_SYNCPT_WAIT or DRM_IOCTL_V3D_GET_PARAM or
> DRM_IOCTL_VC4_MMAP_BO, 0xbedebf28) = 0
> ioctl(4, DRM_IOCTL_GET_CAP, 0xbedebf90) = 0
> ioctl(6, DRM_IOCTL_SYNCOBJ_CREATE, 0xbedec770) = 0
> ioctl(6, DRM_IOCTL_AMDGPU_CTX or DRM_IOCTL_ETNAVIV_GEM_NEW or
> DRM_IOCTL_LIMA_GEM_INFO or DRM_IOCTL_MSM_GEM_NEW or DRM_IOCTL_V3D_CREATE_BO
> or DRM_IOCTL_VC4_WAIT_BO, 0xbedec460) = 0
> ioctl(6, DRM_IOCTL_ETNAVIV_GEM_INFO or DRM_IOCTL_OMAP_GEM_NEW or
> DRM_IOCTL_PANFROST_MMAP_BO or DRM_IOCTL_V3D_MMAP_BO or
> DRM_IOCTL_VC4_CREATE_BO or DRM_IOCTL_VIRTGPU_GETPARAM, 0xbedec410) = 0
> openat(AT_FDCWD, "/sys/devices/system/cpu/online", O_RDONLY|O_CLOEXEC) = 7
> ioctl(6, DRM_IOCTL_AMDGPU_CTX or DRM_IOCTL_ETNAVIV_GEM_NEW or
> DRM_IOCTL_LIMA_GEM_INFO or DRM_IOCTL_MSM_GEM_NEW or DRM_IOCTL_V3D_CREATE_BO
> or DRM_IOCTL_VC4_WAIT_BO, 0xbedec240) = 0
> ioctl(6, DRM_IOCTL_ETNAVIV_GEM_INFO or DRM_IOCTL_OMAP_GEM_NEW or
> DRM_IOCTL_PANFROST_MMAP_BO or DRM_IOCTL_V3D_MMAP_BO or
> DRM_IOCTL_VC4_CREATE_BO or DRM_IOCTL_VIRTGPU_GETPARAM, 0xbedec210) = 0
> ioctl(6, DRM_IOCTL_GEM_OPEN, 0xbedec818) = -1 EACCES (Permission denied)
> write(2, "V3D:-1:: Failed to open bo 2: Pe"..., 48V3D:-1:: Failed to open
> bo 2: Permission denied
> ioctl(6, DRM_IOCTL_SYNCOBJ_CREATE, 0xbedec6d8) = 0
> ioctl(6, DRM_IOCTL_AMDGPU_CTX or DRM_IOCTL_ETNAVIV_GEM_NEW or
> DRM_IOCTL_LIMA_GEM_INFO or DRM_IOCTL_MSM_GEM_NEW or DRM_IOCTL_V3D_CREATE_BO
> or DRM_IOCTL_VC4_WAIT_BO, 0xbedec3c8) = 0
> ioctl(6, DRM_IOCTL_ETNAVIV_GEM_INFO or DRM_IOCTL_OMAP_GEM_NEW or
> DRM_IOCTL_PANFROST_MMAP_BO or DRM_IOCTL_V3D_MMAP_BO or
> DRM_IOCTL_VC4_CREATE_BO or DRM_IOCTL_VIRTGPU_GETPARAM, 0xbedec378) = 0
> ioctl(6, DRM_IOCTL_AMDGPU_CTX or DRM_IOCTL_ETNAVIV_GEM_NEW or
> DRM_IOCTL_LIMA_GEM_INFO or DRM_IOCTL_MSM_GEM_NEW or DRM_IOCTL_V3D_CREATE_BO
> or DRM_IOCTL_VC4_WAIT_BO, 0xbedec1a8) = 0
> ioctl(6, DRM_IOCTL_ETNAVIV_GEM_INFO or DRM_IOCTL_OMAP_GEM_NEW or
> DRM_IOCTL_PANFROST_MMAP_BO or DRM_IOCTL_V3D_MMAP_BO or
> DRM_IOCTL_VC4_CREATE_BO or DRM_IOCTL_VIRTGPU_GETPARAM, 0xbedec178) = 0
> ioctl(6, DRM_IOCTL_GEM_OPEN, 0xbedec818) = -1 EACCES (Permission denied)
> write(2, "V3D:-1:: Failed to open bo 2: Pe"..., 48V3D:-1:: Failed to open
> bo 2: Permission denied
>
>
>
>
> ====== drm.debug
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.920528]
> [drm:drm_stub_open [drm]]
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.920751] [drm:drm_open
> [drm]] comm="glxgears", pid=448, minor=1
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.920995] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe201, auth=1, DRM_IOCTL_GET_MAGIC
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.921207]
> [drm:drm_getmagic [drm]] 1
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.921520] [drm:drm_ioctl
> [drm]] comm="Xorg" pid=237, dev=0xe201, auth=1, DRM_IOCTL_AUTH_MAGIC
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.921733]
> [drm:drm_authmagic [drm]] 1
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.922042] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe201, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.922257] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe201, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.929723] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe201, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.929942] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe201, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.944279] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe201, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.944500] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe201, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.950969] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe201, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.951187] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe201, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.956154] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe201, auth=1, VC4_GET_PARAM
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.956367] [drm:drm_ioctl
> [drm]] comm="glxgears", pid=448, ret=-19
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.956652]
> [drm:drm_stub_open [drm]]
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.956870] [drm:drm_open
> [drm]] comm="glxgears", pid=448, minor=128
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.957103] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe280, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.957317] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe280, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.957548]
> [drm:drm_release [drm]] open_count = 3
> Mar 14 18:55:47 buildroot user.debug kernel: [35999.957754]
> [drm:drm_file_free.part.0 [drm]] comm="glxgears", pid=448, dev=0xe280,
> open_count=3
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.050627]
> [drm:drm_stub_open [drm]]
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.050844] [drm:drm_open
> [drm]] comm="glxgears", pid=448, minor=128
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.051068] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe280, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.051279] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe280, auth=1, DRM_IOCTL_VERSION
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.051502] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe280, auth=1, DRM_IOCTL_GET_UNIQUE
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.051704]
> [drm:drm_ioctl_permit [drm]] DRM_RENDER_ALLOW
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.051905] [drm:drm_ioctl
> [drm]] comm="glxgears", pid=448, ret=-13
> ...snip...
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.121036] [drm:drm_ioctl
> [drm]] comm="glxgears" pid=448, dev=0xe280, auth=1, DRM_IOCTL_GEM_OPEN
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.121241]
> [drm:drm_ioctl_permit [drm]] DRM_RENDER_ALLOW
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.121433] [drm:drm_ioctl
> [drm]] comm="Xorg" pid=237, dev=0xe280, auth=1, V3D_MMAP_BO
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.121635] [drm:drm_ioctl
> [drm]] comm="glxgears", pid=448, ret=-13
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.121825] [drm:drm_ioctl
> [drm]] comm="Xorg" pid=237, dev=0xe280, auth=1, V3D_WAIT_BO
> Mar 14 18:55:47 buildroot user.debug kernel: [36000.122071] [drm:drm_ioctl
> [drm]] comm="Xorg" pid=237, dev=0xe280, auth=1, V3D_SUBMIT_CL
>
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