[PATCH RFC 00/24] Lima DRM driver
Daniel Vetter
daniel at ffwll.ch
Wed May 23 09:02:23 UTC 2018
On Fri, May 18, 2018 at 05:27:51PM +0800, Qiang Yu wrote:
> 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.
Curios question, but why? The one thing that ttm does help you with is
keeping track of buffer moves from/to discrete memory. You get that
benefit at the cost of a nice midlayer which tends to get in the way. If
all you do is map buffers into pagetables, then rolling your own (like
e.g. etnaviv does) is I think much better: All the other ttm functionality
(reservatsions, drm_mm allocation management, fences) has all been
extracted and is available to any driver without ttm.
-Daniel
> - 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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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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