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Commit e0bacd2f authored by Ben Skeggs's avatar Ben Skeggs
Browse files

drm/nouveau/vm: make vm refcount into a kref 



Never used to be required, but a recent change made it necessary.

Reported-by: default avatarMaarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
parent dc409df9

drivers/gpu/drm/nouveau/core/include/subdev/vm.h

+1 −1
Original line number Diff line number Diff line
@@ -55,7 +55,7 @@ struct nouveau_vma { 
struct nouveau_vm {

	struct nouveau_vmmgr *vmm;

	struct nouveau_mm mm;

	int refcount;

	struct kref refcount;



	struct list_head pgd_list;

	atomic_t engref[NVDEV_SUBDEV_NR];

drivers/gpu/drm/nouveau/core/subdev/vm/base.c

+10 −17
Original line number Diff line number Diff line
@@ -361,7 +361,7 @@ nouveau_vm_create(struct nouveau_vmmgr *vmm, u64 offset, u64 length, 


	INIT_LIST_HEAD(&vm->pgd_list);

	vm->vmm = vmm;

	vm->refcount = 1;

	kref_init(&vm->refcount);

	vm->fpde = offset >> (vmm->pgt_bits + 12);

	vm->lpde = (offset + length - 1) >> (vmm->pgt_bits + 12);
@@ -441,8 +441,9 @@ nouveau_vm_unlink(struct nouveau_vm *vm, struct nouveau_gpuobj *mpgd) 
}



static void

nouveau_vm_del(struct nouveau_vm *vm)

nouveau_vm_del(struct kref *kref)

{

	struct nouveau_vm *vm = container_of(kref, typeof(*vm), refcount);

	struct nouveau_vm_pgd *vpgd, *tmp;



	list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
@@ -458,27 +459,19 @@ int 
nouveau_vm_ref(struct nouveau_vm *ref, struct nouveau_vm **ptr,

	       struct nouveau_gpuobj *pgd)

{

	struct nouveau_vm *vm;

	int ret;



	vm = ref;

	if (vm) {

		ret = nouveau_vm_link(vm, pgd);

	if (ref) {

		int ret = nouveau_vm_link(ref, pgd);

		if (ret)

			return ret;



		vm->refcount++;

		kref_get(&ref->refcount);

	}



	vm = *ptr;

	*ptr = ref;



	if (vm) {

		nouveau_vm_unlink(vm, pgd);



		if (--vm->refcount == 0)

			nouveau_vm_del(vm);

	if (*ptr) {

		nouveau_vm_unlink(*ptr, pgd);

		kref_put(&(*ptr)->refcount, nouveau_vm_del);

	}



	*ptr = ref;

	return 0;

}