From f67fa5229331f6d4920175dd0d6e1e6a2c69c060 Mon Sep 17 00:00:00 2001
From: Francisco Jerez <currojerez@riseup.net>
Date: Sun, 31 Oct 2010 01:37:47 +0200
Subject: [PATCH] dri/nouveau: Keep small DYNAMIC_DRAW vertex buffers in system
 ram.

---
 src/mesa/drivers/dri/nouveau/nouveau_array.c  |  5 ++--
 .../drivers/dri/nouveau/nouveau_bufferobj.c   | 25 +++++++++++++++----
 .../drivers/dri/nouveau/nouveau_bufferobj.h   |  7 ++++++
 src/mesa/drivers/dri/nouveau/nouveau_vbo_t.c  | 11 ++++----
 4 files changed, 35 insertions(+), 13 deletions(-)

diff --git a/src/mesa/drivers/dri/nouveau/nouveau_array.c b/src/mesa/drivers/dri/nouveau/nouveau_array.c
index 1fee3603092..17e6d163a02 100644
--- a/src/mesa/drivers/dri/nouveau/nouveau_array.c
+++ b/src/mesa/drivers/dri/nouveau/nouveau_array.c
@@ -90,7 +90,7 @@ nouveau_init_array(struct nouveau_array *a, int attr, int stride,
 	a->buf = NULL;
 
 	if (obj) {
-		if (_mesa_is_bufferobj(obj)) {
+		if (nouveau_bufferobj_hw(obj)) {
 			struct nouveau_bufferobj *nbo =
 				to_nouveau_bufferobj(obj);
 
@@ -107,7 +107,8 @@ nouveau_init_array(struct nouveau_array *a, int attr, int stride,
 			a->offset = 0;
 
 			if (map)
-				a->buf = ptr;
+				a->buf = ADD_POINTERS(
+					nouveau_bufferobj_sys(obj), ptr);
 		}
 	}
 
diff --git a/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.c b/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.c
index c1453416347..e60b91f64be 100644
--- a/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.c
+++ b/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.c
@@ -36,7 +36,9 @@ get_bufferobj_map(struct gl_buffer_object *obj, unsigned flags)
 	struct nouveau_bufferobj *nbo = to_nouveau_bufferobj(obj);
 	void *map = NULL;
 
-	if (nbo->bo) {
+	if (nbo->sys) {
+		map = nbo->sys;
+	} else if (nbo->bo) {
 		nouveau_bo_map(nbo->bo, flags);
 		map = nbo->bo->map;
 		nouveau_bo_unmap(nbo->bo);
@@ -65,6 +67,7 @@ nouveau_bufferobj_del(struct gl_context *ctx, struct gl_buffer_object *obj)
 	struct nouveau_bufferobj *nbo = to_nouveau_bufferobj(obj);
 
 	nouveau_bo_ref(NULL, &nbo->bo);
+	FREE(nbo->sys);
 	FREE(nbo);
 }
 
@@ -79,11 +82,23 @@ nouveau_bufferobj_data(struct gl_context *ctx, GLenum target, GLsizeiptrARB size
 	obj->Size = size;
 	obj->Usage = usage;
 
+	/* Free previous storage */
 	nouveau_bo_ref(NULL, &nbo->bo);
-	ret = nouveau_bo_new(context_dev(ctx),
-			     NOUVEAU_BO_GART | NOUVEAU_BO_MAP, 0,
-			     size, &nbo->bo);
-	assert(!ret);
+	FREE(nbo->sys);
+
+	if (target == GL_ELEMENT_ARRAY_BUFFER_ARB ||
+	    (size < 512 && usage == GL_DYNAMIC_DRAW_ARB) ||
+	    context_chipset(ctx) < 0x10) {
+		/* Heuristic: keep it in system ram */
+		nbo->sys = MALLOC(size);
+
+	} else {
+		/* Get a hardware BO */
+		ret = nouveau_bo_new(context_dev(ctx),
+				     NOUVEAU_BO_GART | NOUVEAU_BO_MAP, 0,
+				     size, &nbo->bo);
+		assert(!ret);
+	}
 
 	if (data)
 		memcpy(get_bufferobj_map(obj, NOUVEAU_BO_WR), data, size);
diff --git a/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.h b/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.h
index acfc4cb9a90..01ef0bad0fd 100644
--- a/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.h
+++ b/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.h
@@ -30,9 +30,16 @@
 struct nouveau_bufferobj {
 	struct gl_buffer_object base;
 	struct nouveau_bo *bo;
+	void *sys;
 };
 #define to_nouveau_bufferobj(x) ((struct nouveau_bufferobj *)(x))
 
+#define nouveau_bufferobj_hw(x) \
+	(_mesa_is_bufferobj(x) ? to_nouveau_bufferobj(x)->bo : NULL)
+
+#define nouveau_bufferobj_sys(x) \
+	(_mesa_is_bufferobj(x) ? to_nouveau_bufferobj(x)->sys : NULL)
+
 void
 nouveau_bufferobj_functions_init(struct dd_function_table *functions);
 
diff --git a/src/mesa/drivers/dri/nouveau/nouveau_vbo_t.c b/src/mesa/drivers/dri/nouveau/nouveau_vbo_t.c
index bf5885f8b17..9437fc98788 100644
--- a/src/mesa/drivers/dri/nouveau/nouveau_vbo_t.c
+++ b/src/mesa/drivers/dri/nouveau/nouveau_vbo_t.c
@@ -297,22 +297,21 @@ vbo_bind_vertices(struct gl_context *ctx, const struct gl_client_array **arrays,
 
 	FOR_EACH_BOUND_ATTR(render, i, attr) {
 		const struct gl_client_array *array = arrays[attr];
+		struct gl_buffer_object *obj = array->BufferObj;
 		struct nouveau_array *a = &render->attrs[attr];
 		unsigned delta = (base + min_index) * array->StrideB;
 
 		bo[i] = NULL;
 
-		if (_mesa_is_bufferobj(array->BufferObj)) {
-			struct nouveau_bufferobj *nbo =
-				to_nouveau_bufferobj(array->BufferObj);
-
+		if (nouveau_bufferobj_hw(obj)) {
 			/* Array in a buffer obj. */
-			nouveau_bo_ref(nbo->bo, &bo[i]);
+			nouveau_bo_ref(to_nouveau_bufferobj(obj)->bo, &bo[i]);
 			offset[i] = delta + (intptr_t)array->Ptr;
 
 		} else {
 			int n = max_index - min_index + 1;
-			char *sp = (char *)array->Ptr + delta;
+			char *sp = (char *)ADD_POINTERS(
+				nouveau_bufferobj_sys(obj), array->Ptr) + delta;
 			char *dp  = nouveau_get_scratch(ctx, n * a->stride,
 							&bo[i], &offset[i]);
 
-- 
2.30.2