Nvidia released some documentation on how CRC support works on their GPUs, hooray!
So: this patch series implements said CRC support in nouveau, along with adding some special debugfs interfaces for some relevant igt-gpu-tools tests (already on the ML).
First - we add some new functionality to kthread_work in the kernel, and then use this to add a new feature to DRM that Ville Syrjälä came up with: vblank workers. Basically, this is just a generic DRM interface that allows for scheduling high-priority workers that start on a given vblank interrupt. Note that while we're currently only using this in nouveau, Intel has plans to use this for i915 as well (hence why they came up with it!).
And finally: in order to implement the last feature, we expose some new functions in the kernel's kthread_worker infrastructure so that we can de-complicate our implementation of this.
Anyway-welcome to the future! :)
Major changes since v6: * Move vblank_work related functions into their own files * Write documentation * Simplify work flushing and cancellation by getting rid of seqcounts and ->pending Major changes since v4: * Remove the interfaces we tried adding to kthread_worker and use a wait queue + seqcount in order to implement flushing vblank workers. * Rebase Major changes since v3: * Style fixes on nouveau patches from checkpatch, no functional changes * Don't integrate so tightly with kthread_work (and use our own lock), instead introduce some new functions for doing simple async flushing and cancelling. I think this interface looks a lot more acceptable then what I was previously trying. * Apply some changes requested by danvet Major changes since v2: * Use kthread_worker instead of kthreadd for vblank workers * Don't check debugfs return values
Lyude Paul (11): drm/vblank: Register drmm cleanup action once per drm_vblank_crtc drm/vblank: Use spin_(un)lock_irq() in drm_crtc_vblank_off() drm/vblank: Add vblank works drm/nouveau/kms/nv50-: Unroll error cleanup in nv50_head_create() drm/nouveau/kms/nv140-: Don't modify depth in state during atomic commit drm/nouveau/kms/nv50-: Fix disabling dithering drm/nouveau/kms/nv50-: s/harm/armh/g drm/nouveau/kms/nv140-: Track wndw mappings in nv50_head_atom drm/nouveau/kms/nv50-: Expose nv50_outp_atom in disp.h drm/nouveau/kms/nv50-: Move hard-coded object handles into header drm/nouveau/kms/nvd9-: Add CRC support
Documentation/gpu/drm-kms.rst | 15 + drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_vblank.c | 83 ++- drivers/gpu/drm/drm_vblank_internal.h | 19 + drivers/gpu/drm/drm_vblank_work.c | 259 +++++++ drivers/gpu/drm/drm_vblank_work_internal.h | 24 + drivers/gpu/drm/nouveau/dispnv04/crtc.c | 25 +- drivers/gpu/drm/nouveau/dispnv50/Kbuild | 4 + drivers/gpu/drm/nouveau/dispnv50/atom.h | 21 + drivers/gpu/drm/nouveau/dispnv50/core.h | 4 + drivers/gpu/drm/nouveau/dispnv50/core907d.c | 3 + drivers/gpu/drm/nouveau/dispnv50/core917d.c | 3 + drivers/gpu/drm/nouveau/dispnv50/corec37d.c | 3 + drivers/gpu/drm/nouveau/dispnv50/corec57d.c | 3 + drivers/gpu/drm/nouveau/dispnv50/crc.c | 714 ++++++++++++++++++++ drivers/gpu/drm/nouveau/dispnv50/crc.h | 125 ++++ drivers/gpu/drm/nouveau/dispnv50/crc907d.c | 139 ++++ drivers/gpu/drm/nouveau/dispnv50/crcc37d.c | 153 +++++ drivers/gpu/drm/nouveau/dispnv50/disp.c | 58 +- drivers/gpu/drm/nouveau/dispnv50/disp.h | 24 + drivers/gpu/drm/nouveau/dispnv50/handles.h | 16 + drivers/gpu/drm/nouveau/dispnv50/head.c | 134 +++- drivers/gpu/drm/nouveau/dispnv50/head.h | 12 +- drivers/gpu/drm/nouveau/dispnv50/head907d.c | 14 +- drivers/gpu/drm/nouveau/dispnv50/headc37d.c | 27 +- drivers/gpu/drm/nouveau/dispnv50/headc57d.c | 20 +- drivers/gpu/drm/nouveau/dispnv50/wndw.c | 15 +- drivers/gpu/drm/nouveau/nouveau_display.c | 60 +- include/drm/drm_vblank.h | 20 + include/drm/drm_vblank_work.h | 71 ++ 30 files changed, 1910 insertions(+), 160 deletions(-) create mode 100644 drivers/gpu/drm/drm_vblank_internal.h create mode 100644 drivers/gpu/drm/drm_vblank_work.c create mode 100644 drivers/gpu/drm/drm_vblank_work_internal.h create mode 100644 drivers/gpu/drm/nouveau/dispnv50/crc.c create mode 100644 drivers/gpu/drm/nouveau/dispnv50/crc.h create mode 100644 drivers/gpu/drm/nouveau/dispnv50/crc907d.c create mode 100644 drivers/gpu/drm/nouveau/dispnv50/crcc37d.c create mode 100644 drivers/gpu/drm/nouveau/dispnv50/handles.h create mode 100644 include/drm/drm_vblank_work.h