drm/nouveau/ltc: init comptag mm in fb subdev

A single location for the MM allows us to share allocation logic.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/subdev/ltc.h

@@ -14,7 +14,6 @@ struct nvkm_ltc {
 
 	u32 num_tags;
 	u32 tag_base;
-	struct nvkm_mm tags;
 	struct nvkm_mm_node *tag_ram;
 
 	int zbc_min;

drivers/gpu/drm/nouveau/nvkm/subdev/ltc/base.c

@@ -28,7 +28,8 @@
 int
 nvkm_ltc_tags_alloc(struct nvkm_ltc *ltc, u32 n, struct nvkm_mm_node **pnode)
 {
-	int ret = nvkm_mm_head(&ltc->tags, 0, 1, n, n, 1, pnode);
+	struct nvkm_fb *fb = ltc->subdev.device->fb;
+	int ret = nvkm_mm_head(&fb->tags, 0, 1, n, n, 1, pnode);
 	if (ret)
 		*pnode = NULL;
 	return ret;
@@ -37,7 +38,8 @@ nvkm_ltc_tags_alloc(struct nvkm_ltc *ltc, u32 n, struct nvkm_mm_node **pnode)
 void
 nvkm_ltc_tags_free(struct nvkm_ltc *ltc, struct nvkm_mm_node **pnode)
 {
-	nvkm_mm_free(&ltc->tags, pnode);
+	struct nvkm_fb *fb = ltc->subdev.device->fb;
+	nvkm_mm_free(&fb->tags, pnode);
 }
 
 void
@@ -118,7 +120,6 @@ nvkm_ltc_dtor(struct nvkm_subdev *subdev)
 {
 	struct nvkm_ltc *ltc = nvkm_ltc(subdev);
 	struct nvkm_ram *ram = ltc->subdev.device->fb->ram;
-	nvkm_mm_fini(&ltc->tags);
 	if (ram)
 		nvkm_mm_free(&ram->vram, &ltc->tag_ram);
 	return ltc;

drivers/gpu/drm/nouveau/nvkm/subdev/ltc/gf100.c

@@ -152,7 +152,8 @@ gf100_ltc_flush(struct nvkm_ltc *ltc)
 int
 gf100_ltc_oneinit_tag_ram(struct nvkm_ltc *ltc)
 {
-	struct nvkm_ram *ram = ltc->subdev.device->fb->ram;
+	struct nvkm_fb *fb = ltc->subdev.device->fb;
+	struct nvkm_ram *ram = fb->ram;
 	u32 tag_size, tag_margin, tag_align;
 	int ret;
 
@@ -197,7 +198,8 @@ gf100_ltc_oneinit_tag_ram(struct nvkm_ltc *ltc)
 	}
 
 mm_init:
-	return nvkm_mm_init(&ltc->tags, 0, 0, ltc->num_tags, 1);
+	nvkm_mm_fini(&fb->tags);
+	return nvkm_mm_init(&fb->tags, 0, 0, ltc->num_tags, 1);
 }
 
 int

drivers/gpu/drm/nouveau/nvkm/subdev/ltc/gp100.c

@@ -45,7 +45,7 @@ gp100_ltc_oneinit(struct nvkm_ltc *ltc)
 	ltc->ltc_nr = nvkm_rd32(device, 0x12006c);
 	ltc->lts_nr = nvkm_rd32(device, 0x17e280) >> 28;
 	/*XXX: tagram allocation - TBD */
-	return nvkm_mm_init(&ltc->tags, 0, 0, 0, 1);
+	return 0;
 }
 
 static void