diff options
Diffstat (limited to 'drivers/gpu/drm/v3d/v3d_gemfs.c')
-rw-r--r-- | drivers/gpu/drm/v3d/v3d_gemfs.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/gpu/drm/v3d/v3d_gemfs.c b/drivers/gpu/drm/v3d/v3d_gemfs.c new file mode 100644 index 000000000000..4c5e18590a5c --- /dev/null +++ b/drivers/gpu/drm/v3d/v3d_gemfs.c @@ -0,0 +1,50 @@ +// 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); +} |