// SPDX-License-Identifier: GPL-2.0+ /* Copyright (C) 2024 Raspberry Pi */ #include <linux/fs.h> #include <linux/mount.h> #include "v3d_drv.h" void v3d_gemfs_init(struct v3d_dev *v3d) { char huge_opt[] = "huge=within_size"; struct file_system_type *type; struct vfsmount *gemfs; /* * By creating our own shmemfs mountpoint, we can pass in * mount flags that better match our usecase. However, we * only do so on platforms which benefit from it. */ if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) goto err; /* The user doesn't want to enable Super Pages */ if (!super_pages) goto err; type = get_fs_type("tmpfs"); if (!type) goto err; gemfs = vfs_kern_mount(type, SB_KERNMOUNT, type->name, huge_opt); if (IS_ERR(gemfs)) goto err; v3d->gemfs = gemfs; drm_info(&v3d->drm, "Using Transparent Hugepages\n"); return; err: v3d->gemfs = NULL; drm_notice(&v3d->drm, "Transparent Hugepage support is recommended for optimal performance on this platform!\n"); } void v3d_gemfs_fini(struct v3d_dev *v3d) { if (v3d->gemfs) kern_unmount(v3d->gemfs); }