| 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 | #include <linux/fs_context.h> |
| 7 | |
| 8 | #include <drm/drm_print.h> |
| 9 | |
| 10 | #include "v3d_drv.h" |
| 11 | |
| 12 | void v3d_gemfs_init(struct v3d_dev *v3d) |
| 13 | { |
| 14 | struct file_system_type *type; |
| 15 | struct fs_context *fc; |
| 16 | struct vfsmount *gemfs; |
| 17 | int ret; |
| 18 | |
| 19 | /* |
| 20 | * By creating our own shmemfs mountpoint, we can pass in |
| 21 | * mount flags that better match our usecase. However, we |
| 22 | * only do so on platforms which benefit from it. |
| 23 | */ |
| 24 | if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) |
| 25 | goto err; |
| 26 | |
| 27 | /* The user doesn't want to enable Super Pages */ |
| 28 | if (!super_pages) |
| 29 | goto err; |
| 30 | |
| 31 | type = get_fs_type(name: "tmpfs"); |
| 32 | if (!type) |
| 33 | goto err; |
| 34 | |
| 35 | fc = fs_context_for_mount(fs_type: type, SB_KERNMOUNT); |
| 36 | if (IS_ERR(ptr: fc)) |
| 37 | goto err; |
| 38 | ret = vfs_parse_fs_string(fc, key: "source", value: "tmpfs"); |
| 39 | if (!ret) |
| 40 | ret = vfs_parse_fs_string(fc, key: "huge", value: "within_size"); |
| 41 | if (!ret) |
| 42 | gemfs = fc_mount_longterm(fc); |
| 43 | put_fs_context(fc); |
| 44 | if (ret) |
| 45 | goto err; |
| 46 | |
| 47 | v3d->gemfs = gemfs; |
| 48 | drm_info(&v3d->drm, "Using Transparent Hugepages\n"); |
| 49 | |
| 50 | return; |
| 51 | |
| 52 | err: |
| 53 | v3d->gemfs = NULL; |
| 54 | drm_notice(&v3d->drm, |
| 55 | "Transparent Hugepage support is recommended for optimal performance on this platform!\n"); |
| 56 | } |
| 57 | |
| 58 | void v3d_gemfs_fini(struct v3d_dev *v3d) |
| 59 | { |
| 60 | if (v3d->gemfs) |
| 61 | kern_unmount(mnt: v3d->gemfs); |
| 62 | } |
| 63 |