drm/nouveau/mmu: switch to instanced constructor

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

drm/nouveau/mmu: remove old vmm frontend

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/mmu: define user interfaces to mmu

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/mmu/gf100-: type-based vram allocation and bar mapping

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/mmu: build up information on available memory types

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/mmu: remove support for old backends

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/mmu/gk104,gk20a: implement new vmm backend

Adds support for:
- 64KiB big page size.
- System-memory PTs.
- LPTE "invalid" state.
- (Tegra) Use of video memory aperture.

Adds support for marking LPTEs invalid, resulting in the corresponding
SPTEs being ignored, which is supposed to speed up TLB invalidates.

On The Tegra side, this will switch to using the video memory aperture
for all mappings. The HW will still target non-coherent system memory,
but this aperture needs to be selected in order to support compression.

Tegra's instmem backend somewhat cheated to get this effect previously.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/mmu: remove old vm creation hooks

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/mmu/gk104,gk20a: implement vmm on top of new base

Adds support for:
- Selection of a 64KiB big page size (NvFbBigPage=16).
- System-memory PDs.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/mmu/gk104: fork from gf100

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>