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      1 /*	$NetBSD: i915_gemfs.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $	*/
      2 
      3 /*
      4  * SPDX-License-Identifier: MIT
      5  *
      6  * Copyright  2017 Intel Corporation
      7  */
      8 
      9 #include <sys/cdefs.h>
     10 __KERNEL_RCSID(0, "$NetBSD: i915_gemfs.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $");
     11 
     12 #include <linux/fs.h>
     13 #include <linux/mount.h>
     14 #include <linux/pagemap.h>
     15 
     16 #include "i915_drv.h"
     17 #include "i915_gemfs.h"
     18 
     19 int i915_gemfs_init(struct drm_i915_private *i915)
     20 {
     21 	struct file_system_type *type;
     22 	struct vfsmount *gemfs;
     23 
     24 	type = get_fs_type("tmpfs");
     25 	if (!type)
     26 		return -ENODEV;
     27 
     28 	/*
     29 	 * By creating our own shmemfs mountpoint, we can pass in
     30 	 * mount flags that better match our usecase.
     31 	 *
     32 	 * One example, although it is probably better with a per-file
     33 	 * control, is selecting huge page allocations ("huge=within_size").
     34 	 * Currently unused due to bandwidth issues (slow reads) on Broadwell+.
     35 	 */
     36 
     37 	gemfs = kern_mount(type);
     38 	if (IS_ERR(gemfs))
     39 		return PTR_ERR(gemfs);
     40 
     41 	i915->mm.gemfs = gemfs;
     42 
     43 	return 0;
     44 }
     45 
     46 void i915_gemfs_fini(struct drm_i915_private *i915)
     47 {
     48 	kern_unmount(i915->mm.gemfs);
     49 }
     50