<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> Good morning list! To answer my own question... It turns out that the Buildroot configure scripts silently disabling dri3 when no DRI driver is selected. Though it seems that the Gallium drivers for VC4/V3D reverting to DRI. But because there was no dri support compiled in, it must fail in the end. So for everybody who is trying to get a Buildroot linux with GPU acceleration, consider to enable at least in Target Packages -> Graphic libraries... -> mesa3d Gallium KMSRO driver Gallium v3d driver Gallium vc4 driver DRI swrast driver With these options I got it working now and swrast is not being used. Instead, using LIBGL_DEBUG=verbose, you will see that it reverts to DRI3. With the -info you will also see that it is using the V3D 4.2 renderer. Best regards, Michael <div class="moz-cite-prefix">Am 15.03.2021 um 18:24 schrieb Michael Taubert: </div> <blockquote type="cite" cite="mid:a3d5770d-feea-1669-e22f-4f8673b34e53@arachnodroid.de"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> Yes, that was one of my first thoughts so I check the permissions in the filesystem. I think they are okay, as everything is running with user root, at the moment. # namei -l /dev/dri/renderD128 f: /dev/dri/renderD128 drwxr-xr-x root root / drwxr-xr-x root root dev drwxr-xr-x root root dri crw-rw-rw- root video renderD128 Today I had the chance to check that on a Raspbian and with strace I couldn't find a DRM_IOCTL_GEM_OPEN. They both have a permission denied on DRM_IOCTL_GET_UNIQUE, so I assume that the GEM_OPEN is the problem here. It makes me think that it's a problem with my compilation of Mesa3D or may be the configuration? According to the kernel manpage <a class="moz-txt-link-freetext" href="https://dri.freedesktop.org/docs/drm/gpu/drm-uapi.html" moz-do-not-send="true">https://dri.freedesktop.org/docs/drm/gpu/drm-uapi.html</a> "With render nodes, user-space can now control access to the render node via basic file-system access-modes. A running graphics server which authenticates clients on the privileged primary/legacy node is no longer required. Instead, a client can open the render node and is immediately granted GPU access." It seems to me that glxgears shouldn't even try to perform any privileged ioctl's on the render node (dev/dri/renderD128). On Raspbian, glxgears continues with a DRM_IOCTL_PRIME_FD_TO_HANDLE. So what is causing glxgears to use this, instead of a DRM_IOCTL_GEM_OPEN? Best regards, Michael <div class="moz-cite-prefix">Am 15.03.2021 um 14:02 schrieb Jens Owen: </div> <blockquote type="cite" cite="mid:CAJ5TNtb_0wZYeB1SBNf1igHx0Sw0QeqOHnvZHRZC6nk0jN0QDw@mail.gmail.com"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <div dir="auto">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.</div> <div dir="auto"> </div> <div> <div class="gmail_quote"> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex" dir="auto"> 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 <a href="http://github.com/raspberrypi/linux" rel="noreferrer" target="_blank" moz-do-not-send="true">github.com/raspberrypi/linux</a>) Firmware stable (branch at <a href="http://github.com/raspberrypi/firmware" rel="noreferrer" target="_blank" moz-do-not-send="true">github.com/raspberrypi/firmware</a>) 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <<a href="https://lists.freedesktop.org/archives/mesa-users/attachments/20210314/4dc3eead/attachment-0001.htm" rel="noreferrer" target="_blank" moz-do-not-send="true">https://lists.freedesktop.org/archives/mesa-users/attachments/20210314/4dc3eead/attachment-0001.htm</a>> ------------------------------ Subject: Digest Footer _______________________________________________ mesa-users mailing list <a href="mailto:mesa-users@lists.freedesktop.org" target="_blank" moz-do-not-send="true">mesa-users@lists.freedesktop.org</a> <a href="https://lists.freedesktop.org/mailman/listinfo/mesa-users" rel="noreferrer" target="_blank" moz-do-not-send="true">https://lists.freedesktop.org/mailman/listinfo/mesa-users</a> ------------------------------ End of mesa-users Digest, Vol 130, Issue 3 ****************************************** </blockquote> </div> </div> <fieldset class="mimeAttachmentHeader"></fieldset> <pre class="moz-quote-pre" wrap="">_______________________________________________ mesa-users mailing list <a class="moz-txt-link-abbreviated" href="mailto:mesa-users@lists.freedesktop.org" moz-do-not-send="true">mesa-users@lists.freedesktop.org</a> <a class="moz-txt-link-freetext" href="https://lists.freedesktop.org/mailman/listinfo/mesa-users" moz-do-not-send="true">https://lists.freedesktop.org/mailman/listinfo/mesa-users</a> </pre> </blockquote> <fieldset class="mimeAttachmentHeader"></fieldset> <pre class="moz-quote-pre" wrap="">_______________________________________________ mesa-users mailing list <a class="moz-txt-link-abbreviated" href="mailto:mesa-users@lists.freedesktop.org">mesa-users@lists.freedesktop.org</a> <a class="moz-txt-link-freetext" href="https://lists.freedesktop.org/mailman/listinfo/mesa-users">https://lists.freedesktop.org/mailman/listinfo/mesa-users</a> </pre> </blockquote> </body> </html>