[PATCH RFC 00/24] Lima DRM driver

Qiang Yu yuq825 at gmail.com
Sat May 19 06:52:19 UTC 2018


Kernel DRM driver for ARM Mali 400/450 GPUs.

This implementation mainly take amdgpu DRM driver as reference.

- Mali 4xx GPUs have two kinds of processors GP and PP. GP is for
  OpenGL vertex shader processing and PP is for fragment shader
  processing. Each processor has its own MMU so prcessors work in
  virtual address space.
- There's only one GP but multiple PP (max 4 for mali 400 and 8
  for mali 450) in the same mali 4xx GPU. All PPs are grouped
  togather to handle a single fragment shader task divided by
  FB output tiled pixels. Mali 400 user space driver is
  responsible for assign target tiled pixels to each PP, but mali
  450 has a HW module called DLBU to dynamically balance each
  PP's load.
- User space driver allocate buffer object and map into GPU
  virtual address space, upload command stream and draw data with
  CPU mmap of the buffer object, then submit task to GP/PP with
  a register frame indicating where is the command stream and misc
  settings.
- There's no command stream validation/relocation due to each user
  process has its own GPU virtual address space. GP/PP's MMU switch
  virtual address space before running two tasks from different
  user process. Error or evil user space code just get MMU fault
  or GP/PP error IRQ, then the HW/SW will be recovered.
- Use TTM as MM. TTM_PL_TT type memory is used as the content of
  lima buffer object which is allocated from TTM page pool. all
  lima buffer object gets pinned with TTM_PL_FLAG_NO_EVICT when
  allocation, so there's no buffer eviction and swap for now. We
  need reverse engineering to see if and how GP/PP support MMU
  fault recovery (continue execution). Otherwise we have to
  pin/unpin each envolved buffer when task creation/deletion.
- Use drm_sched for GPU task schedule. Each OpenGL context should
  have a lima context object in the kernel to distinguish tasks
  from different user. drm_sched gets task from each lima context
  in a fair way.

Not implemented:
- Dump buffer support
- Power management
- Performance counter

This patch serial just pack a pair of .c/.h files in each patch.
For whole history of this driver's development, see:
https://github.com/yuq/linux-lima/commits/lima-4.17-rc4

Mesa driver is still in development and not ready for daily usage,
but can run some simple tests like kmscube and glamrk2, see:
https://github.com/yuq/mesa-lima

Andrei Paulau (1):
  arm64/dts: add switch-delay for meson mali

Lima Project Developers (10):
  drm/lima: add mali 4xx GPU hardware regs
  drm/lima: add lima core driver
  drm/lima: add GPU device functions
  drm/lima: add PMU related functions
  drm/lima: add PP related functions
  drm/lima: add MMU related functions
  drm/lima: add GPU virtual memory space handing
  drm/lima: add GEM related functions
  drm/lima: add GEM Prime related functions
  drm/lima: add makefile and kconfig

Qiang Yu (12):
  dt-bindings: add switch-delay property for mali-utgard
  arm64/dts: add switch-delay for meson mali
  Revert "drm: Nerf the preclose callback for modern drivers"
  drm/lima: add lima uapi header
  drm/lima: add L2 cache functions
  drm/lima: add GP related functions
  drm/lima: add BCAST related function
  drm/lima: add DLBU related functions
  drm/lima: add TTM subsystem functions
  drm/lima: add buffer object functions
  drm/lima: add GPU schedule using DRM_SCHED
  drm/lima: add context related functions

Simon Shields (1):
  ARM: dts: add gpu node to exynos4

 .../bindings/gpu/arm,mali-utgard.txt          |   4 +
 arch/arm/boot/dts/exynos4.dtsi                |  33 ++
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi   |   1 +
 .../boot/dts/amlogic/meson-gxl-mali.dtsi      |   1 +
 drivers/gpu/drm/Kconfig                       |   2 +
 drivers/gpu/drm/Makefile                      |   1 +
 drivers/gpu/drm/drm_file.c                    |   8 +-
 drivers/gpu/drm/lima/Kconfig                  |   9 +
 drivers/gpu/drm/lima/Makefile                 |  19 +
 drivers/gpu/drm/lima/lima_bcast.c             |  65 +++
 drivers/gpu/drm/lima/lima_bcast.h             |  34 ++
 drivers/gpu/drm/lima/lima_ctx.c               | 143 +++++
 drivers/gpu/drm/lima/lima_ctx.h               |  51 ++
 drivers/gpu/drm/lima/lima_device.c            | 407 ++++++++++++++
 drivers/gpu/drm/lima/lima_device.h            | 136 +++++
 drivers/gpu/drm/lima/lima_dlbu.c              |  75 +++
 drivers/gpu/drm/lima/lima_dlbu.h              |  37 ++
 drivers/gpu/drm/lima/lima_drv.c               | 466 ++++++++++++++++
 drivers/gpu/drm/lima/lima_drv.h               |  77 +++
 drivers/gpu/drm/lima/lima_gem.c               | 459 ++++++++++++++++
 drivers/gpu/drm/lima/lima_gem.h               |  41 ++
 drivers/gpu/drm/lima/lima_gem_prime.c         |  66 +++
 drivers/gpu/drm/lima/lima_gem_prime.h         |  31 ++
 drivers/gpu/drm/lima/lima_gp.c                | 293 +++++++++++
 drivers/gpu/drm/lima/lima_gp.h                |  34 ++
 drivers/gpu/drm/lima/lima_l2_cache.c          |  98 ++++
 drivers/gpu/drm/lima/lima_l2_cache.h          |  32 ++
 drivers/gpu/drm/lima/lima_mmu.c               | 154 ++++++
 drivers/gpu/drm/lima/lima_mmu.h               |  34 ++
 drivers/gpu/drm/lima/lima_object.c            | 120 +++++
 drivers/gpu/drm/lima/lima_object.h            |  87 +++
 drivers/gpu/drm/lima/lima_pmu.c               |  85 +++
 drivers/gpu/drm/lima/lima_pmu.h               |  30 ++
 drivers/gpu/drm/lima/lima_pp.c                | 418 +++++++++++++++
 drivers/gpu/drm/lima/lima_pp.h                |  37 ++
 drivers/gpu/drm/lima/lima_regs.h              | 304 +++++++++++
 drivers/gpu/drm/lima/lima_sched.c             | 497 ++++++++++++++++++
 drivers/gpu/drm/lima/lima_sched.h             | 126 +++++
 drivers/gpu/drm/lima/lima_ttm.c               | 409 ++++++++++++++
 drivers/gpu/drm/lima/lima_ttm.h               |  44 ++
 drivers/gpu/drm/lima/lima_vm.c                | 312 +++++++++++
 drivers/gpu/drm/lima/lima_vm.h                |  73 +++
 include/drm/drm_drv.h                         |  23 +-
 include/uapi/drm/lima_drm.h                   | 195 +++++++
 44 files changed, 5565 insertions(+), 6 deletions(-)
 create mode 100644 drivers/gpu/drm/lima/Kconfig
 create mode 100644 drivers/gpu/drm/lima/Makefile
 create mode 100644 drivers/gpu/drm/lima/lima_bcast.c
 create mode 100644 drivers/gpu/drm/lima/lima_bcast.h
 create mode 100644 drivers/gpu/drm/lima/lima_ctx.c
 create mode 100644 drivers/gpu/drm/lima/lima_ctx.h
 create mode 100644 drivers/gpu/drm/lima/lima_device.c
 create mode 100644 drivers/gpu/drm/lima/lima_device.h
 create mode 100644 drivers/gpu/drm/lima/lima_dlbu.c
 create mode 100644 drivers/gpu/drm/lima/lima_dlbu.h
 create mode 100644 drivers/gpu/drm/lima/lima_drv.c
 create mode 100644 drivers/gpu/drm/lima/lima_drv.h
 create mode 100644 drivers/gpu/drm/lima/lima_gem.c
 create mode 100644 drivers/gpu/drm/lima/lima_gem.h
 create mode 100644 drivers/gpu/drm/lima/lima_gem_prime.c
 create mode 100644 drivers/gpu/drm/lima/lima_gem_prime.h
 create mode 100644 drivers/gpu/drm/lima/lima_gp.c
 create mode 100644 drivers/gpu/drm/lima/lima_gp.h
 create mode 100644 drivers/gpu/drm/lima/lima_l2_cache.c
 create mode 100644 drivers/gpu/drm/lima/lima_l2_cache.h
 create mode 100644 drivers/gpu/drm/lima/lima_mmu.c
 create mode 100644 drivers/gpu/drm/lima/lima_mmu.h
 create mode 100644 drivers/gpu/drm/lima/lima_object.c
 create mode 100644 drivers/gpu/drm/lima/lima_object.h
 create mode 100644 drivers/gpu/drm/lima/lima_pmu.c
 create mode 100644 drivers/gpu/drm/lima/lima_pmu.h
 create mode 100644 drivers/gpu/drm/lima/lima_pp.c
 create mode 100644 drivers/gpu/drm/lima/lima_pp.h
 create mode 100644 drivers/gpu/drm/lima/lima_regs.h
 create mode 100644 drivers/gpu/drm/lima/lima_sched.c
 create mode 100644 drivers/gpu/drm/lima/lima_sched.h
 create mode 100644 drivers/gpu/drm/lima/lima_ttm.c
 create mode 100644 drivers/gpu/drm/lima/lima_ttm.h
 create mode 100644 drivers/gpu/drm/lima/lima_vm.c
 create mode 100644 drivers/gpu/drm/lima/lima_vm.h
 create mode 100644 include/uapi/drm/lima_drm.h

-- 
2.17.0



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