LXR linux/drivers/gpu/drm/i915/i915

   1/*
   2 * Copyright © 2017 Intel Corporation
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice (including the next
  12 * paragraph) shall be included in all copies or substantial portions of the
  13 * Software.
  14 *
  15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21 * IN THE SOFTWARE.
  22 *
  23 */
  24
  25#include <linux/fs.h>
  26#include <linux/mount.h>
  27#include <linux/pagemap.h>
  28
  29#include "i915_drv.h"
  30#include "i915_gemfs.h"
  31
  32int i915_gemfs_init(struct drm_i915_private *i915)
  33{
  34        struct file_system_type *type;
  35        struct vfsmount *gemfs;
  36
  37        type = get_fs_type("tmpfs");
  38        if (!type)
  39                return -ENODEV;
  40
  41        gemfs = kern_mount(type);
  42        if (IS_ERR(gemfs))
  43                return PTR_ERR(gemfs);
  44
  45        /*
  46         * Enable huge-pages for objects that are at least HPAGE_PMD_SIZE, most
  47         * likely 2M. Note that within_size may overallocate huge-pages, if say
  48         * we allocate an object of size 2M + 4K, we may get 2M + 2M, but under
  49         * memory pressure shmem should split any huge-pages which can be
  50         * shrunk.
  51         */
  52
  53        if (has_transparent_hugepage()) {
  54                struct super_block *sb = gemfs->mnt_sb;
  55                /* FIXME: Disabled until we get W/A for read BW issue. */
  56                char options[] = "huge=never";
  57                int flags = 0;
  58                int err;
  59
  60                err = sb->s_op->remount_fs(sb, &flags, options);
  61                if (err) {
  62                        kern_unmount(gemfs);
  63                        return err;
  64                }
  65        }
  66
  67        i915->mm.gemfs = gemfs;
  68
  69        return 0;
  70}
  71
  72void i915_gemfs_fini(struct drm_i915_private *i915)
  73{
  74        kern_unmount(i915->mm.gemfs);
  75}
  76