1// SPDX-License-Identifier: GPL-2.0+
 2/* Copyright (C) 2024 Raspberry Pi */
 3
 4#include <linux/fs.h>
 5#include <linux/mount.h>
 6
 7#include "v3d_drv.h"
 8
 9void v3d_gemfs_init(struct v3d_dev *v3d)
10{
11	char huge_opt[] = "huge=within_size";
12	struct file_system_type *type;
13	struct vfsmount *gemfs;
14
15	/*
16	 * By creating our own shmemfs mountpoint, we can pass in
17	 * mount flags that better match our usecase. However, we
18	 * only do so on platforms which benefit from it.
19	 */
20	if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
21		goto err;
22
23	/* The user doesn't want to enable Super Pages */
24	if (!super_pages)
25		goto err;
26
27	type = get_fs_type("tmpfs");
28	if (!type)
29		goto err;
30
31	gemfs = vfs_kern_mount(type, SB_KERNMOUNT, type->name, huge_opt);
32	if (IS_ERR(gemfs))
33		goto err;
34
35	v3d->gemfs = gemfs;
36	drm_info(&v3d->drm, "Using Transparent Hugepages\n");
37
38	return;
39
40err:
41	v3d->gemfs = NULL;
42	drm_notice(&v3d->drm,
43		   "Transparent Hugepage support is recommended for optimal performance on this platform!\n");
44}
45
46void v3d_gemfs_fini(struct v3d_dev *v3d)
47{
48	if (v3d->gemfs)
49		kern_unmount(v3d->gemfs);
50}