projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 465c403c MA |
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> | |
| b901bb89 | 27 | #include <linux/pagemap.h> |
| 465c403c MA |
28 | |
| 29 | #include "i915_drv.h" | |
| 30 | #include "i915_gemfs.h" | |
| 31 | ||
| 32 | int 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 | ||
| b901bb89 MA |
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; | |
| fd50fbb6 JL |
55 | /* FIXME: Disabled until we get W/A for read BW issue. */ |
| 56 | char options[] = "huge=never"; | |
| b901bb89 MA |
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 | ||
| 465c403c MA |
67 | i915->mm.gemfs = gemfs; |
| 68 | ||
| 69 | return 0; | |
| 70 | } | |
| 71 | ||
| 72 | void i915_gemfs_fini(struct drm_i915_private *i915) | |
| 73 | { | |
| 74 | kern_unmount(i915->mm.gemfs); | |
| 75 | } |