drm/nouveau/mmu: implement base for new vm management

This is the first chunk of the new VMM code that provides the structures
needed to describe a GPU virtual address-space layout, as well as common
interfaces to handle VMM creation, and connecting instances to a VMM.

The constructor now allocates the PD itself, rather than having the user
handle that manually.  This won't/can't be used until after all backends
have been ported to these interfaces, so a little bit of memory will be
wasted on Fermi and newer for a couple of commits in the series.

Compatibility has been hacked into the old code to allow each GPU backend
to be ported individually.

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

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/priv.h b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/priv.h
index 0f3bb316022a..ee0a8416df19 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/priv.h
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/priv.h
@@ -32,6 +32,14 @@ struct nvkm_mmu_func {
 	void (*unmap)(struct nvkm_vma *, struct nvkm_memory *pgt,
 		      u32 pte, u32 cnt);
 	void (*flush)(struct nvkm_vm *);
+
+	struct {
+		struct nvkm_sclass base;
+		int (*ctor)(struct nvkm_mmu *, u64 addr, u64 size,
+			    void *argv, u32 argc, struct lock_class_key *,
+			    const char *name, struct nvkm_vmm **);
+		bool global;
+	} vmm;
 };
 
 int nvkm_vm_create(struct nvkm_mmu *, u64, u64, u64, u32,