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Status

Be able to run the following OGL application:

• off-screen rendering
  • simple triangle: https://github.com/yuq/gfx/tree/master/gbm-surface
  • vertex shader uniform: https://github.com/yuq/gfx/tree/master/gbm-surface-move
  • multi varying: https://github.com/yuq/gfx/tree/master/gbm-surface-color
  • multi draw: https://github.com/yuq/gfx/tree/master/gbm-surface-draw
  • FBO: https://github.com/yuq/gfx/tree/master/gbm-surface-fbo
  • kmscube: https://github.com/yuq/kmscube
    • ./kmscube -d -D /dev/dri/renderD128
    • ./kmscube -d -D /dev/dri/renderD128 -M rgba
• on-screen rendering
  • PRIME export/import: https://github.com/enunes/mesa-test-programs/blob/master/gbm-bo-test.c
  • renderonly lib: https://github.com/enunes/mesa-test-programs/blob/master/eglkms.c
  • kmscube: https://cgit.freedesktop.org/mesa/kmscube/
    • ./kmscube
    • ./kmscube -M rgba
    • ./kmscube -A
  • glmark2: https://github.com/glmark2/glmark2
    • glmark2-drm -b build
    • glmark2-es2-drm -b build

Tested on

• Mali400
  • Allwinner A20/H3
  • Rockchip RK3188
  • Exynos 4412
• Mali450
  • Allwinner H5
  • Rockchip RK3328
  • Amlogic S905X

Build and install

common process

1. build Linux kernel with lima driver from: https://github.com/yuq/linux-lima
2. build mesa with lima driver by:

./configure --with-gallium-drivers=exynos,sun4i,meson,rockchip,lima --with-dri-drivers= \
  --with-platforms=drm,x11 --disable-xvmc --disable-vdpau --enable-debug

buildroot

For those who want to use buildroot: https://github.com/enunes/buildroot-external-lima

OpenEmbedded

meson metadata with lima driver and test apps: https://github.com/superna9999/meta-meson/tree/topic/mesa-lima

Tool

• dump the runtime close source mali driver memory for reverse engineering
  • https://github.com/yuq/mali-syscall-tracker

TODO

mesa

• Newly refined GP compiler needs optimization, code size can be ~40% smaller compared to close source driver output, main problem should be creating too many moves but too few reg load/store
• PP compiler optimization, add post scheduler instruction combination which combine multi instructions into one instruction
• both GP and PP compiler need control flow and other un-implemented instruction support
• texture mipmap support
• Build a piglit test result list so that we can start clear them one by one.
• New mesa NIR changes will always lower io/alu to scalar which is not expected by PP, need merge scalar back to vector or create a PIPE_CAP to disable it, see
  • https://www.mail-archive.com/mesa-dev@lists.freedesktop.org/msg189216.html
• Tiled texture format support
• optimization
  • thread rendering that has dedicated render thread to submit command

kernel

• Power management
• TTM buffer eviction/swap support, need to investigate if GP/PP support MMU fault recovery
• Dump buffer support

Done

mesa

• GP compiler needs re-fine so that we can guarantee the vertex shader compilation succeed, Connor Abbott think out a new algorithm which should work
• Mesa renderonly lib support
• multi varying support, current implementation assumes we only have a single varying (gl_Position), command stream setup need be implemented for multi varying support
• command stream setup for multi draw, flush at once
• Mali450 initial support
• PP uniform support, command stream need be setup for PP uniform
• fix render fail when buffer is 800x600, maybe due to buffer alignment or command stream setup
• break the ABI come from libdrm_lima which is integrated into mesa for more efficiency especially the command submit interface
• texture support, both PP compiler and command stream need be changed
• command stream setup refine for multi FBO and dynamic buffer size
• Mali450 fully support
• EGL_ANDROID_native_fence_sync support

kernel

• PRIME export support
• Mali450 initial support
• New task scheduler which can create a per OGL context fence context. We can use the new drm_sched which is from amdgpu and will be adopted by etnaviv too. drm_sched should be in Linux kernel 4.16.
• New memory management for non-continuous buffer object
• Different GPU mCLK frequency setup, current GPU mCLK frequency is the default frequency when system boot, but GPU should be able to run on a higher frequency.
• Mali450 fully support, include multi group GP/PP, DLBU
• submit support syn fd dep
• use TTM as MM

Reference

• Lima offical site: http://web.archive.org/web/20180106112822/http://limadriver.org/
• compiler: https://gitorious.org/open-gpu-tools/cwabbotts-open-gpu-tools/

Donation

https://paypal.me/yuq825