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, 12 insertions, 4 deletions

diff --git a/drivers/gpu/drm/nouveau/include/nvkm/subdev/mmu.h b/drivers/gpu/drm/nouveau/include/nvkm/subdev/mmu.h
index 40e21f2..8ff71e7 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/subdev/mmu.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/subdev/mmu.h
@@ -26,20 +26,28 @@ struct nvkm_vma {
 };
 
 struct nvkm_vm {
+	const struct nvkm_vmm_func *func;
 	struct nvkm_mmu *mmu;
-
+	const char *name;
+	struct kref kref;
 	struct mutex mutex;
+
+	u64 start;
+	u64 limit;
+
+	struct nvkm_vmm_pt *pd;
+	u16 pd_offset;
+	struct list_head join;
+
 	struct nvkm_mm mm;
 	struct kref refcount;
-
 	struct list_head pgd_list;
-	atomic_t engref[NVKM_SUBDEV_NR];
-
 	struct nvkm_vm_pgt *pgt;
 	u32 fpde;
 	u32 lpde;
 
 	bool bootstrapped;
+	atomic_t engref[NVKM_SUBDEV_NR];
 };
 
 int  nvkm_vm_new(struct nvkm_device *, u64 offset, u64 length, u64 mm_offset,