[agl-dev-community] Tips for debugging GPU acceleration.

[Alex Bennée <alex.bennee@xxxxxxxxxx>]

Hi Gerd,

I'm currently trying to get accelerated graphics working on an AArch64
AGL distribution (both in KVM and TCG builds). As far as I can tell the
device is being correctly created and I do get a working DRI based
display. However the Weston based compositor falls back to the softpipe
rendering:

  Date: 2020-10-22 UTC
  [19:37:22.296] Using config file '/etc/xdg/weston/weston.ini'.
  [19:37:22.297] Output repaint window is 7 ms maximum.
  [19:37:22.298] Loading module '/usr/lib/libweston-8/drm-backend.so'
  [19:37:22.318] initializing drm backend
  [19:37:22.323] logind: not running in a systemd session
  [19:37:22.323] logind: cannot setup systemd-logind helper (-61), using legacy fallback
  [19:37:22.370] using /dev/dri/card0
  [19:37:22.370] DRM: supports universal planes
  [19:37:22.370] DRM: supports atomic modesetting
  [19:37:22.370] DRM: supports picture aspect ratio
  [19:37:22.373] Loading module '/usr/lib/libweston-8/gl-renderer.so'
  [19:37:22.540] EGL client extensions: EGL_EXT_client_extensions
                 EGL_EXT_device_base EGL_EXT_device_enumeration
                 EGL_EXT_device_query EGL_EXT_platform_base
                 EGL_KHR_client_get_all_proc_addresses EGL_KHR_debug
                 EGL_EXT_platform_wayland EGL_MESA_platform_gbm
                 EGL_MESA_platform_surfaceless EGL_EXT_platform_device
  [19:37:22.542] EGL version: 1.4
  [19:37:22.542] EGL vendor: Mesa Project
  [19:37:22.542] EGL client APIs: OpenGL OpenGL_ES 
  [19:37:22.542] EGL extensions: EGL_ANDROID_blob_cache EGL_EXT_buffer_age
                 EGL_EXT_image_dma_buf_import EGL_KHR_cl_event2
                 EGL_KHR_config_attribs EGL_KHR_create_context
                 EGL_KHR_create_context_no_error EGL_KHR_fence_sync
                 EGL_KHR_get_all_proc_addresses EGL_KHR_gl_colorspace
                 EGL_KHR_gl_renderbuffer_image EGL_KHR_gl_texture_2D_image
                 EGL_KHR_gl_texture_3D_image EGL_KHR_gl_texture_cubemap_image
                 EGL_KHR_image EGL_KHR_image_base EGL_KHR_image_pixmap
                 EGL_KHR_no_config_context EGL_KHR_reusable_sync
                 EGL_KHR_surfaceless_context EGL_EXT_pixel_format_float
                 EGL_KHR_wait_sync EGL_MESA_configless_context
                 EGL_MESA_image_dma_buf_export EGL_MESA_query_driver
  [19:37:22.542] warning: Disabling render GPU timeline and explicit synchronization due to missing EGL_ANDROID_native_fence_sync extension
  [19:37:22.542] EGL_KHR_surfaceless_context available
  [19:37:22.819] GL version: OpenGL ES 3.1 Mesa 20.0.2
  [19:37:22.819] GLSL version: OpenGL ES GLSL ES 3.10
  [19:37:22.819] GL vendor: VMware, Inc.
  [19:37:22.819] GL renderer: softpipe
  [19:37:22.819] GL extensions: GL_EXT_blend_minmax GL_EXT_multi_draw_arrays

I know the kernel has the right bits enabled (VIRTIO_DRM_GPU) but the
kernel seems to think the host needs something else to support it:

  [    2.743035] virtio-pci 0000:00:04.0: enabling device (0000 -> 0003)
  [    2.746441] virtio-pci 0000:00:05.0: enabling device (0000 -> 0002)
  [    2.778843] random: fast init done
  [    2.780024] random: crng init done
  [    2.781054] bochs-drm 0000:00:02.0: remove_conflicting_pci_framebuffers: bar 0: 0x10000000 -> 0x10ffffff
  [    2.781597] bochs-drm 0000:00:02.0: remove_conflicting_pci_framebuffers: bar 2: 0x11014000 -> 0x11014fff
  [    2.786609] bochs-drm 0000:00:02.0: enabling device (0000 -> 0002)
  [    2.789259] [drm] Found bochs VGA, ID 0xb0c5.
  [    2.789639] [drm] Framebuffer size 16384 kB @ 0x10000000, mmio @ 0x11014000.
  [    2.791527] [TTM] Zone  kernel: Available graphics memory: 2015562 KiB
  [    2.792300] [TTM] Initializing pool allocator
  [    2.793275] [TTM] Initializing DMA pool allocator
  [    2.801629] [drm] Found EDID data blob.
  [    2.809735] [drm] Initialized bochs-drm 1.0.0 20130925 for 0000:00:02.0 on minor 0
  [    2.903431] Console: switching to colour frame buffer device 128x48
  [    2.928141] bochs-drm 0000:00:02.0: fb0: bochs-drmdrmfb frame buffer device
  [    2.929844] [drm] pci: virtio-gpu-pci detected at 0000:00:05.0
  [    2.930300] [drm] virgl 3d acceleration not supported by host
  [    2.930484] [drm] EDID support available.
  [    2.931193] [drm] number of scanouts: 1
  [    2.931318] [drm] number of cap sets: 0
  [    2.935329] [drm] Initialized virtio_gpu 0.1.0 0 for virtio4 on minor 1
  [    3.058526] virtio_gpu virtio4: fb1: virtio_gpudrmfb frame buffer device

I'm invoking QEMU on both systems with:

  -device virtio-gpu-pci,virgl=true

The full TCG command line is:

  ./aarch64-softmmu/qemu-system-aarch64 -cpu cortex-a57 \
    -machine type=virt,virtualization=on,gic-version=3 \
    -serial mon:stdio \
    -netdev user,id=unet,hostfwd=tcp::2222-:22 \
    -device virtio-net-device,netdev=unet,id=virt-net \
    -drive id=disk0,file=$HOME/images/agl/agl-demo-platform-crosssdk-qemuarm64.ext4,if=none,format=raw \
    -device virtio-blk-device,drive=disk0 \
    -soundhw hda \
    -device qemu-xhci \
    -device usb-tablet \
    -device usb-kbd \
    -object rng-random,filename=/dev/urandom,id=rng0 \
    -device virtio-rng-pci,rng=rng0 \
    -device virtio-serial-device \
    -chardev null,id=virtcon \
    -device virtconsole,chardev=virtcon \
    -m 4096 \
    -kernel ~/images/agl/Image \
    -append "console=ttyAMA0 root=/dev/vda" \
    -display gtk,show-cursor=on \
    -smp 4 \
    -device virtio-gpu-pci,virgl=true

Any tips on how to track down where things are going wrong?

-- 
Alex Bennée


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