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