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// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2024 Raspberry Pi */
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/fs_context.h>
#include "v3d_drv.h"
static int add_param(struct fs_context *fc, const char *key, const char *val)
{
return vfs_parse_fs_string(fc, key, val, strlen(val));
}
void v3d_gemfs_init(struct v3d_dev *v3d)
{
struct file_system_type *type;
struct fs_context *fc;
struct vfsmount *gemfs;
int ret;
/*
* 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;
fc = fs_context_for_mount(type, SB_KERNMOUNT);
if (IS_ERR(fc))
goto err;
ret = add_param(fc, "source", "tmpfs");
if (!ret)
ret = add_param(fc, "huge", "within_size");
if (!ret)
gemfs = fc_mount_longterm(fc);
put_fs_context(fc);
if (ret)
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);
}
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