On Wed, Mar 6, 2019 at 9:24 AM Qiang Yu <yuq...@gmail.com> wrote: > > - 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 GEM+shmem for MM. Currently just alloc and pin memory when > gem object creation. GPU vm map of the buffer is also done in > the alloc stage in kernel space. We may delay the memory > allocation and real GPU vm map to command submission stage in the > furture as improvement. > - 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. > > mesa driver can be found here before upstreamed: > https://gitlab.freedesktop.org/lima/mesa > > v7: > - remove lima_fence_ops with default value > - move fence slab create to device probe > - check pad ioctl args to be zero > - add comments for user/kernel interface > > v6: > - fix comments by checkpatch.pl > > v5: > - export gp/pp version to userspace > - rebase on drm-misc-next > > v4: > - use get param interface to get info > - separate context create/free ioctl > - remove unused max sched task param > - update copyright time > - use xarray instead of idr > - stop using drmP.h > > v3: > - fix comments from kbuild robot > - restrict supported arch to tested ones > > v2: > - fix syscall argument check > - fix job finish fence leak since kernel 5.0 > - use drm syncobj to replace native fence > - move buffer object GPU va map into kernel > - reserve syscall argument space for future info > - remove kernel gem modifier > - switch TTM back to GEM+shmem MM > - use time based io poll > - use whole register name > - adopt gem reservation obj integration > - use drm_timeout_abs_to_jiffies > > Cc: Eric Anholt <e...@anholt.net> > Cc: Rob Herring <r...@kernel.org> > Cc: Christian König <ckoenig.leichtzumer...@gmail.com> > Cc: Daniel Vetter <dan...@ffwll.ch> > Cc: Alex Deucher <alexdeuc...@gmail.com> > Cc: Sam Ravnborg <s...@ravnborg.org> > Cc: Rob Clark <robdcl...@gmail.com> > Signed-off-by: Andreas Baierl <ich...@imkreisrum.de> > Signed-off-by: Erico Nunes <nunes.er...@gmail.com> > Signed-off-by: Heiko Stuebner <he...@sntech.de> > Signed-off-by: Marek Vasut <ma...@denx.de> > Signed-off-by: Neil Armstrong <narmstr...@baylibre.com> > Signed-off-by: Simon Shields <si...@lineageos.org> > Signed-off-by: Vasily Khoruzhick <anars...@gmail.com> > Signed-off-by: Qiang Yu <yuq...@gmail.com> > --- > drivers/gpu/drm/Kconfig | 2 + > drivers/gpu/drm/Makefile | 1 + > drivers/gpu/drm/lima/Kconfig | 10 + > drivers/gpu/drm/lima/Makefile | 21 ++ > drivers/gpu/drm/lima/lima_bcast.c | 47 +++ > drivers/gpu/drm/lima/lima_bcast.h | 14 + > drivers/gpu/drm/lima/lima_ctx.c | 97 ++++++ > drivers/gpu/drm/lima/lima_ctx.h | 30 ++ > drivers/gpu/drm/lima/lima_device.c | 385 +++++++++++++++++++++++ > drivers/gpu/drm/lima/lima_device.h | 131 ++++++++ > drivers/gpu/drm/lima/lima_dlbu.c | 58 ++++ > drivers/gpu/drm/lima/lima_dlbu.h | 18 ++ > drivers/gpu/drm/lima/lima_drv.c | 376 +++++++++++++++++++++++ > drivers/gpu/drm/lima/lima_drv.h | 45 +++ > drivers/gpu/drm/lima/lima_gem.c | 381 +++++++++++++++++++++++ > drivers/gpu/drm/lima/lima_gem.h | 25 ++ > drivers/gpu/drm/lima/lima_gem_prime.c | 47 +++ > drivers/gpu/drm/lima/lima_gem_prime.h | 13 + > drivers/gpu/drm/lima/lima_gp.c | 283 +++++++++++++++++ > drivers/gpu/drm/lima/lima_gp.h | 16 + > drivers/gpu/drm/lima/lima_l2_cache.c | 80 +++++ > drivers/gpu/drm/lima/lima_l2_cache.h | 14 + > drivers/gpu/drm/lima/lima_mmu.c | 142 +++++++++ > drivers/gpu/drm/lima/lima_mmu.h | 16 + > drivers/gpu/drm/lima/lima_object.c | 122 ++++++++ > drivers/gpu/drm/lima/lima_object.h | 36 +++ > drivers/gpu/drm/lima/lima_pmu.c | 60 ++++ > drivers/gpu/drm/lima/lima_pmu.h | 12 + > drivers/gpu/drm/lima/lima_pp.c | 427 ++++++++++++++++++++++++++ > drivers/gpu/drm/lima/lima_pp.h | 19 ++ > drivers/gpu/drm/lima/lima_regs.h | 298 ++++++++++++++++++ > drivers/gpu/drm/lima/lima_sched.c | 404 ++++++++++++++++++++++++ > drivers/gpu/drm/lima/lima_sched.h | 104 +++++++ > drivers/gpu/drm/lima/lima_vm.c | 282 +++++++++++++++++ > drivers/gpu/drm/lima/lima_vm.h | 62 ++++ > include/uapi/drm/lima_drm.h | 164 ++++++++++ > 36 files changed, 4242 insertions(+)
Reviewed-by: Rob Herring <r...@kerrnel.org> I can apply this if you want, though I'm not completely sure whether folks want the mesa bits to go upstream first. Rob _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
