/* * SPDX-License-Identifier: MIT * * Copyright © 2017 Intel Corporation */ #include <linux/fs.h> #include <linux/mount.h> #include <linux/pagemap.h> #include "i915_drv.h" #include "i915_gemfs.h" int i915_gemfs_init(struct drm_i915_private *i915) { struct file_system_type *type; struct vfsmount *gemfs; type = get_fs_type("tmpfs"); if (!type) return -ENODEV; gemfs = kern_mount(type); if (IS_ERR(gemfs)) return PTR_ERR(gemfs); /* * Enable huge-pages for objects that are at least HPAGE_PMD_SIZE, most * likely 2M. Note that within_size may overallocate huge-pages, if say * we allocate an object of size 2M + 4K, we may get 2M + 2M, but under * memory pressure shmem should split any huge-pages which can be * shrunk. */ if (has_transparent_hugepage()) { struct super_block *sb = gemfs->mnt_sb; /* FIXME: Disabled until we get W/A for read BW issue. */ char options[] = "huge=never"; int flags = 0; int err; err = sb->s_op->remount_fs(sb, &flags, options); if (err) { kern_unmount(gemfs); return err; } } i915->mm.gemfs = gemfs; return 0; } void i915_gemfs_fini(struct drm_i915_private *i915) { kern_unmount(i915->mm.gemfs); }