[Nouveau] [PATCH 0/4] NV50/GF100 behind constrained hierarchies

[Jon Derrick]

Hi Ben,

I've been working with an mmio-constrained pci hierarchy intended almost
solely for nvme devices and switches. Binding nouveau to an NV50-based
gpu results in a kernel panic as the device cannot be fully mapped.

I've made modifications in nv50 and vmm to unbind the driver from this
hierarchy, and modified gf100 assuming it will have the same issue.

1/4 also includes a fix where nv50 doesn't look like it checks the
return value for nvkm_vmm_new for bar1. I don't know if this was
intentional (eg, it could work without it).

I'm wholly unfamiliar with linux graphics drivers so let me know if
there's a better place for this.

Jon Derrick (4):
  drm/nouveau/bar/nv50: check bar1 vmm return value
  drm/nouveau/bar/nv50: ensure BAR is mapped
  drm/nouveau/bar/gf100: ensure BAR is mapped
  drm/nouveau/mmu: qualify vmm during dtor

 drivers/gpu/drm/nouveau/nvkm/subdev/bar/gf100.c |  2 ++
 drivers/gpu/drm/nouveau/nvkm/subdev/bar/nv50.c  | 14 +++++++++++---
 drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c   |  2 +-
 3 files changed, 14 insertions(+), 4 deletions(-)

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2.14.4