drm/nouveau/nvkm: add locking to subdev/engine init paths

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This wasn't really needed before; the main place this could race is with
channel recovery, but (through potentially fragile means) shouldn't have
been possible.

However, a number of upcoming patches benefit from having better control
over subdev init, necessitating some improvements here.

- allows subdev/engine oneinit() without init() (host/fifo patches)
- merges engine use locking/tracking into subdev, and extends it to fix
  some issues that will arise with future usage patterns (acr patches)

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

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This commit is contained in:

Ben Skeggs 2022-06-01 20:47:19 +10:00

parent 565bfaf1f2

commit 8478cd5a74

4 changed files with 142 additions and 69 deletions

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6

drivers/gpu/drm/nouveau/include/nvkm/core/engine.h

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25

drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h

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63

drivers/gpu/drm/nouveau/nvkm/core/engine.c

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117

drivers/gpu/drm/nouveau/nvkm/core/subdev.c

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