drm/etnaviv: Record GPU visible size of GEM BO separately

The GPU visible size of a GEM BO is not necessarily PAGE_SIZE aligned,
which happens when CPU page size is not equal to GPU page size. Extra
precious resources such as GPU page tables and GPU TLBs may being paid
because of this but never get used.

Track the size of GPU visible part of GEM BO separately, ensure no
GPUVA range wasting by aligning that size to GPU page size.

Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

Author: suijingfeng

drivers/gpu/drm/etnaviv/etnaviv_gem.c

@@ -544,7 +544,7 @@ static const struct drm_gem_object_funcs etnaviv_gem_object_funcs = {
 	.vm_ops = &vm_ops,
 };
 
-static int etnaviv_gem_new_impl(struct drm_device *dev, u32 flags,
+static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
 	const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj)
 {
 	struct etnaviv_gem_object *etnaviv_obj;
@@ -571,6 +571,7 @@ static int etnaviv_gem_new_impl(struct drm_device *dev, u32 flags,
 	if (!etnaviv_obj)
 		return -ENOMEM;
 
+	etnaviv_obj->size = ALIGN(size, SZ_4K);
 	etnaviv_obj->flags = flags;
 	etnaviv_obj->ops = ops;
 
@@ -591,15 +592,13 @@ int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 	struct drm_gem_object *obj = NULL;
 	int ret;
 
-	size = PAGE_ALIGN(size);
-
-	ret = etnaviv_gem_new_impl(dev, flags, &etnaviv_gem_shmem_ops, &obj);
+	ret = etnaviv_gem_new_impl(dev, size, flags, &etnaviv_gem_shmem_ops, &obj);
 	if (ret)
 		goto fail;
 
 	lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
 
-	ret = drm_gem_object_init(dev, obj, size);
+	ret = drm_gem_object_init(dev, obj, PAGE_ALIGN(size));
 	if (ret)
 		goto fail;
 
@@ -628,7 +627,7 @@ int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 	struct drm_gem_object *obj;
 	int ret;
 
-	ret = etnaviv_gem_new_impl(dev, flags, ops, &obj);
+	ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj);
 	if (ret)
 		return ret;
 

drivers/gpu/drm/etnaviv/etnaviv_gem.h

@@ -36,6 +36,11 @@ struct etnaviv_gem_object {
 	const struct etnaviv_gem_ops *ops;
 	struct mutex lock;
 
+	/*
+	 * The actual size that is visible to the GPU, not necessarily
+	 * PAGE_SIZE aligned, but should be aligned to GPU page size.
+	 */
+	u32 size;
 	u32 flags;
 
 	struct list_head gem_node;