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/*
* Copyright © 2017 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include "i915_drv.h"
#include "i915_gemfs.h"
int i915_gemfs_init(struct drm_i915_private *i915)
{
struct file_system_type *type;
struct vfsmount *gemfs;
type = get_fs_type("tmpfs");
if (!type)
return -ENODEV;
gemfs = kern_mount(type);
if (IS_ERR(gemfs))
return PTR_ERR(gemfs);
/*
* Enable huge-pages for objects that are at least HPAGE_PMD_SIZE, most
* likely 2M. Note that within_size may overallocate huge-pages, if say
* we allocate an object of size 2M + 4K, we may get 2M + 2M, but under
* memory pressure shmem should split any huge-pages which can be
* shrunk.
*/
if (has_transparent_hugepage()) {
struct super_block *sb = gemfs->mnt_sb;
char options[] = "huge=within_size";
int flags = 0;
int err;
err = sb->s_op->remount_fs(sb, &flags, options);
if (err) {
kern_unmount(gemfs);
return err;
}
}
i915->mm.gemfs = gemfs;
return 0;
}
void i915_gemfs_fini(struct drm_i915_private *i915)
{
kern_unmount(i915->mm.gemfs);
}
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