drm/nouveau/mmu: protect each vm with its own mutex

An upcoming commit requires being able to modify the PRAMIN BAR page
tables while already holding the MMU subdev mutex.

To solve this issue, each VM has been given its own mutex.  As a nice
side-effect, this also allows separate VMs to be updated concurrently.

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

1 files changed, 7 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 2bf8f46c1bb0..0991c9011dc1 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/subdev/mmu.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/subdev/mmu.h
@@ -26,6 +26,8 @@ struct nvkm_vma {
 
 struct nvkm_vm {
 	struct nvkm_mmu *mmu;
+
+	struct mutex mutex;
 	struct nvkm_mm mm;
 	struct kref refcount;
 
@@ -47,7 +49,8 @@ struct nvkm_mmu {
 	u8  lpg_shift;
 
 	int  (*create)(struct nvkm_mmu *, u64 offset, u64 length,
-		       u64 mm_offset, struct nvkm_vm **);
+		       u64 mm_offset, struct lock_class_key *,
+		       struct nvkm_vm **);
 
 	void (*map_pgt)(struct nvkm_gpuobj *pgd, u32 pde,
 			struct nvkm_gpuobj *pgt[2]);
@@ -85,14 +88,14 @@ extern struct nvkm_oclass nv44_mmu_oclass;
 extern struct nvkm_oclass nv50_mmu_oclass;
 extern struct nvkm_oclass gf100_mmu_oclass;
 
-int  nv04_vm_create(struct nvkm_mmu *, u64, u64, u64,
+int  nv04_vm_create(struct nvkm_mmu *, u64, u64, u64, struct lock_class_key *,
 		    struct nvkm_vm **);
 void nv04_mmu_dtor(struct nvkm_object *);
 
 int  nvkm_vm_create(struct nvkm_mmu *, u64 offset, u64 length, u64 mm_offset,
-		    u32 block, struct nvkm_vm **);
+		    u32 block, struct lock_class_key *, struct nvkm_vm **);
 int  nvkm_vm_new(struct nvkm_device *, u64 offset, u64 length, u64 mm_offset,
-		 struct nvkm_vm **);
+		 struct lock_class_key *, struct nvkm_vm **);
 int  nvkm_vm_ref(struct nvkm_vm *, struct nvkm_vm **, struct nvkm_gpuobj *pgd);
 int  nvkm_vm_get(struct nvkm_vm *, u64 size, u32 page_shift, u32 access,
 		 struct nvkm_vma *);