drm/nouveau: use GEM references instead of TTMs

TTM wants to get rid of the duplicate refcounting of the embedded GEM
object and its own reference count.

Hence, use of GEM object references where possible.

Also get rid of nouveau_bo_ref() and replace it with nouveau_bo_fini(),
which drops the initial reference we get from initializing a ttm_bo.

Reviewed-by: Ben Skeggs <bskeggs@nvidia.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240718165959.3983-4-dakr@kernel.org

9 files changed, 44 insertions, 40 deletions

diff --git a/drivers/gpu/drm/nouveau/dispnv04/crtc.c b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
index 4310ad71870b..438e3ec6e1ca 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/crtc.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
@@ -617,9 +617,15 @@ nv_crtc_swap_fbs(struct drm_crtc *crtc, struct drm_framebuffer *old_fb)
 
 	ret = nouveau_bo_pin(nvbo, NOUVEAU_GEM_DOMAIN_VRAM, false);
 	if (ret == 0) {
-		if (disp->image[nv_crtc->index])
-			nouveau_bo_unpin(disp->image[nv_crtc->index]);
-		nouveau_bo_ref(nvbo, &disp->image[nv_crtc->index]);
+		if (disp->image[nv_crtc->index]) {
+			struct nouveau_bo *bo = disp->image[nv_crtc->index];
+
+			nouveau_bo_unpin(bo);
+			drm_gem_object_put(&bo->bo.base);
+		}
+
+		drm_gem_object_get(&nvbo->bo.base);
+		disp->image[nv_crtc->index] = nvbo;
 	}
 
 	return ret;
@@ -754,13 +760,17 @@ static void nv_crtc_destroy(struct drm_crtc *crtc)
 
 	drm_crtc_cleanup(crtc);
 
-	if (disp->image[nv_crtc->index])
-		nouveau_bo_unpin(disp->image[nv_crtc->index]);
-	nouveau_bo_ref(NULL, &disp->image[nv_crtc->index]);
+	if (disp->image[nv_crtc->index]) {
+		struct nouveau_bo *bo = disp->image[nv_crtc->index];
+
+		nouveau_bo_unpin(bo);
+		drm_gem_object_put(&bo->bo.base);
+		disp->image[nv_crtc->index] = NULL;
+	}
 
 	nouveau_bo_unmap(nv_crtc->cursor.nvbo);
 	nouveau_bo_unpin(nv_crtc->cursor.nvbo);
-	nouveau_bo_ref(NULL, &nv_crtc->cursor.nvbo);
+	nouveau_bo_fini(nv_crtc->cursor.nvbo);
 	nvif_event_dtor(&nv_crtc->vblank);
 	nvif_head_dtor(&nv_crtc->head);
 	kfree(nv_crtc);
@@ -794,9 +804,14 @@ nv_crtc_disable(struct drm_crtc *crtc)
 {
 	struct nv04_display *disp = nv04_display(crtc->dev);
 	struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
-	if (disp->image[nv_crtc->index])
-		nouveau_bo_unpin(disp->image[nv_crtc->index]);
-	nouveau_bo_ref(NULL, &disp->image[nv_crtc->index]);
+
+	if (disp->image[nv_crtc->index]) {
+		struct nouveau_bo *bo = disp->image[nv_crtc->index];
+
+		nouveau_bo_unpin(bo);
+		drm_gem_object_put(&bo->bo.base);
+		disp->image[nv_crtc->index] = NULL;
+	}
 }
 
 static int
@@ -1210,7 +1225,11 @@ nv04_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 		PUSH_NVSQ(push, NV05F, 0x0130, 0);
 	}
 
-	nouveau_bo_ref(new_bo, &dispnv04->image[head]);
+	if (dispnv04->image[head])
+		drm_gem_object_put(&dispnv04->image[head]->bo.base);
+
+	drm_gem_object_get(&new_bo->bo.base);
+	dispnv04->image[head] = new_bo;
 
 	ret = nv04_page_flip_emit(chan, old_bo, new_bo, s, &fence);
 	if (ret)
@@ -1329,7 +1348,7 @@ nv04_crtc_create(struct drm_device *dev, int crtc_num)
 				nouveau_bo_unpin(nv_crtc->cursor.nvbo);
 		}
 		if (ret)
-			nouveau_bo_ref(NULL, &nv_crtc->cursor.nvbo);
+			nouveau_bo_fini(nv_crtc->cursor.nvbo);
 	}
 
 	nv04_cursor_init(nv_crtc);
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index ac9657d7e92d..6d20d3c68fa7 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -2819,7 +2819,7 @@ nv50_display_destroy(struct drm_device *dev)
 	nouveau_bo_unmap(disp->sync);
 	if (disp->sync)
 		nouveau_bo_unpin(disp->sync);
-	nouveau_bo_ref(NULL, &disp->sync);
+	nouveau_bo_fini(disp->sync);
 
 	nouveau_display(dev)->priv = NULL;
 	kfree(disp);
@@ -2862,7 +2862,7 @@ nv50_display_create(struct drm_device *dev)
 				nouveau_bo_unpin(disp->sync);
 		}
 		if (ret)
-			nouveau_bo_ref(NULL, &disp->sync);
+			nouveau_bo_fini(disp->sync);
 	}
 
 	if (ret)
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.h b/drivers/gpu/drm/nouveau/nouveau_bo.h
index 3b8dfbb621da..596a63a50a20 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.h
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.h
@@ -53,25 +53,10 @@ nouveau_bo(struct ttm_buffer_object *bo)
 	return container_of(bo, struct nouveau_bo, bo);
 }
 
-static inline int
-nouveau_bo_ref(struct nouveau_bo *ref, struct nouveau_bo **pnvbo)
+static inline void
+nouveau_bo_fini(struct nouveau_bo *bo)
 {
-	struct nouveau_bo *prev;
-
-	if (!pnvbo)
-		return -EINVAL;
-	prev = *pnvbo;
-
-	if (ref) {
-		ttm_bo_get(&ref->bo);
-		*pnvbo = nouveau_bo(&ref->bo);
-	} else {
-		*pnvbo = NULL;
-	}
-	if (prev)
-		ttm_bo_put(&prev->bo);
-
-	return 0;
+	ttm_bo_put(&bo->bo);
 }
 
 extern struct ttm_device_funcs nouveau_bo_driver;
diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c b/drivers/gpu/drm/nouveau/nouveau_chan.c
index 66fca95c10c7..f568ea251e3b 100644
--- a/drivers/gpu/drm/nouveau/nouveau_chan.c
+++ b/drivers/gpu/drm/nouveau/nouveau_chan.c
@@ -110,7 +110,7 @@ nouveau_channel_del(struct nouveau_channel **pchan)
 		nouveau_bo_unmap(chan->push.buffer);
 		if (chan->push.buffer && chan->push.buffer->bo.pin_count)
 			nouveau_bo_unpin(chan->push.buffer);
-		nouveau_bo_ref(NULL, &chan->push.buffer);
+		nouveau_bo_fini(chan->push.buffer);
 		kfree(chan);
 	}
 	*pchan = NULL;
diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
index 6719353e2e13..7b3b8f4630a2 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -294,7 +294,7 @@ nouveau_dmem_chunk_alloc(struct nouveau_drm *drm, struct page **ppage)
 out_bo_unpin:
 	nouveau_bo_unpin(chunk->bo);
 out_bo_free:
-	nouveau_bo_ref(NULL, &chunk->bo);
+	nouveau_bo_fini(chunk->bo);
 out_release:
 	release_mem_region(chunk->pagemap.range.start, range_len(&chunk->pagemap.range));
 out_free:
@@ -426,7 +426,7 @@ nouveau_dmem_fini(struct nouveau_drm *drm)
 	list_for_each_entry_safe(chunk, tmp, &drm->dmem->chunks, list) {
 		nouveau_dmem_evict_chunk(chunk);
 		nouveau_bo_unpin(chunk->bo);
-		nouveau_bo_ref(NULL, &chunk->bo);
+		nouveau_bo_fini(chunk->bo);
 		WARN_ON(chunk->callocated);
 		list_del(&chunk->list);
 		memunmap_pages(&chunk->pagemap);
diff --git a/drivers/gpu/drm/nouveau/nv10_fence.c b/drivers/gpu/drm/nouveau/nv10_fence.c
index c6a0db5b9e21..1a53b8b80467 100644
--- a/drivers/gpu/drm/nouveau/nv10_fence.c
+++ b/drivers/gpu/drm/nouveau/nv10_fence.c
@@ -88,7 +88,7 @@ nv10_fence_destroy(struct nouveau_drm *drm)
 	nouveau_bo_unmap(priv->bo);
 	if (priv->bo)
 		nouveau_bo_unpin(priv->bo);
-	nouveau_bo_ref(NULL, &priv->bo);
+	nouveau_bo_fini(priv->bo);
 	drm->fence = NULL;
 	kfree(priv);
 }
diff --git a/drivers/gpu/drm/nouveau/nv17_fence.c b/drivers/gpu/drm/nouveau/nv17_fence.c
index 07c2e0878c24..2c99f2c1ddcd 100644
--- a/drivers/gpu/drm/nouveau/nv17_fence.c
+++ b/drivers/gpu/drm/nouveau/nv17_fence.c
@@ -141,7 +141,7 @@ nv17_fence_create(struct nouveau_drm *drm)
 				nouveau_bo_unpin(priv->bo);
 		}
 		if (ret)
-			nouveau_bo_ref(NULL, &priv->bo);
+			nouveau_bo_fini(priv->bo);
 	}
 
 	if (ret) {
diff --git a/drivers/gpu/drm/nouveau/nv50_fence.c b/drivers/gpu/drm/nouveau/nv50_fence.c
index ea1e1f480bfe..6fa18f9d26b6 100644
--- a/drivers/gpu/drm/nouveau/nv50_fence.c
+++ b/drivers/gpu/drm/nouveau/nv50_fence.c
@@ -92,7 +92,7 @@ nv50_fence_create(struct nouveau_drm *drm)
 				nouveau_bo_unpin(priv->bo);
 		}
 		if (ret)
-			nouveau_bo_ref(NULL, &priv->bo);
+			nouveau_bo_fini(priv->bo);
 	}
 
 	if (ret) {
diff --git a/drivers/gpu/drm/nouveau/nv84_fence.c b/drivers/gpu/drm/nouveau/nv84_fence.c
index 812b8c62eeba..9ce4c2d60fe3 100644
--- a/drivers/gpu/drm/nouveau/nv84_fence.c
+++ b/drivers/gpu/drm/nouveau/nv84_fence.c
@@ -188,7 +188,7 @@ nv84_fence_destroy(struct nouveau_drm *drm)
 	nouveau_bo_unmap(priv->bo);
 	if (priv->bo)
 		nouveau_bo_unpin(priv->bo);
-	nouveau_bo_ref(NULL, &priv->bo);
+	nouveau_bo_fini(priv->bo);
 	drm->fence = NULL;
 	kfree(priv);
 }
@@ -232,7 +232,7 @@ nv84_fence_create(struct nouveau_drm *drm)
 				nouveau_bo_unpin(priv->bo);
 		}
 		if (ret)
-			nouveau_bo_ref(NULL, &priv->bo);
+			nouveau_bo_fini(priv->bo);
 	}
 
 	if (ret)