drivers/gpu/drm/i915/gem/i915_gemfs.c

   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 }