[PATCH 0/2] Lima DRM driver

Wed Feb 6 13:14:55 UTC 2019

Kernel DRM driver for ARM Mali 400/450 GPUs.

Since last RFC, all feedback has been addressed. Most Mali DTS
changes are already upstreamed by SoC maintainers. The kernel
driver and user-kernel interface are quite stable for several
months, so I think it's ready to be upstreamed.

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.
- 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.

This patch serial is based on 5.0-rc5 and squash all the commits.
For whole history of this driver's development, see:
https://gitlab.freedesktop.org/lima/linux/commits/lima-5.0-rc5
https://gitlab.freedesktop.org/lima/linux/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, and some
single full screen application like kodi-gbm, see:
https://gitlab.freedesktop.org/lima/mesa

[rfc]
https://lists.freedesktop.org/archives/dri-devel/2018-May/177314.html

Lima Project Developers (1):
  drm/lima: driver for ARM Mali4xx GPUs

Qiang Yu (1):
  drm/fourcc: add ARM tiled format modifier

 drivers/gpu/drm/Kconfig               |   2 +
 drivers/gpu/drm/Makefile              |   1 +
 drivers/gpu/drm/lima/Kconfig          |  10 +
 drivers/gpu/drm/lima/Makefile         |  22 ++
 drivers/gpu/drm/lima/lima_bcast.c     |  46 +++
 drivers/gpu/drm/lima/lima_bcast.h     |  14 +
 drivers/gpu/drm/lima/lima_ctx.c       | 124 +++++++
 drivers/gpu/drm/lima/lima_ctx.h       |  33 ++
 drivers/gpu/drm/lima/lima_device.c    | 384 ++++++++++++++++++++
 drivers/gpu/drm/lima/lima_device.h    | 116 ++++++
 drivers/gpu/drm/lima/lima_dlbu.c      |  56 +++
 drivers/gpu/drm/lima/lima_dlbu.h      |  18 +
 drivers/gpu/drm/lima/lima_drv.c       | 459 ++++++++++++++++++++++++
 drivers/gpu/drm/lima/lima_drv.h       |  59 ++++
 drivers/gpu/drm/lima/lima_gem.c       | 485 +++++++++++++++++++++++++
 drivers/gpu/drm/lima/lima_gem.h       |  25 ++
 drivers/gpu/drm/lima/lima_gem_prime.c | 144 ++++++++
 drivers/gpu/drm/lima/lima_gem_prime.h |  18 +
 drivers/gpu/drm/lima/lima_gp.c        | 280 +++++++++++++++
 drivers/gpu/drm/lima/lima_gp.h        |  16 +
 drivers/gpu/drm/lima/lima_l2_cache.c  |  79 +++++
 drivers/gpu/drm/lima/lima_l2_cache.h  |  14 +
 drivers/gpu/drm/lima/lima_mmu.c       | 135 +++++++
 drivers/gpu/drm/lima/lima_mmu.h       |  16 +
 drivers/gpu/drm/lima/lima_object.c    | 103 ++++++
 drivers/gpu/drm/lima/lima_object.h    |  72 ++++
 drivers/gpu/drm/lima/lima_pmu.c       |  61 ++++
 drivers/gpu/drm/lima/lima_pmu.h       |  12 +
 drivers/gpu/drm/lima/lima_pp.c        | 419 ++++++++++++++++++++++
 drivers/gpu/drm/lima/lima_pp.h        |  19 +
 drivers/gpu/drm/lima/lima_regs.h      | 298 ++++++++++++++++
 drivers/gpu/drm/lima/lima_sched.c     | 486 ++++++++++++++++++++++++++
 drivers/gpu/drm/lima/lima_sched.h     | 108 ++++++
 drivers/gpu/drm/lima/lima_ttm.c       | 319 +++++++++++++++++
 drivers/gpu/drm/lima/lima_ttm.h       |  24 ++
 drivers/gpu/drm/lima/lima_vm.c        | 354 +++++++++++++++++++
 drivers/gpu/drm/lima/lima_vm.h        |  59 ++++
 include/uapi/drm/drm_fourcc.h         |   9 +
 include/uapi/drm/lima_drm.h           | 193 ++++++++++
 39 files changed, 5092 insertions(+)
 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

-- 
2.17.1