61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
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/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2017 Intel Corporation
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*/
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include "i915_drv.h"
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#include "i915_gemfs.h"
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#include "i915_utils.h"
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void i915_gemfs_init(struct drm_i915_private *i915)
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{
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char huge_opt[] = "huge=within_size"; /* r/w */
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struct file_system_type *type;
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struct vfsmount *gemfs;
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/*
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* By creating our own shmemfs mountpoint, we can pass in
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* mount flags that better match our usecase.
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*
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* One example, although it is probably better with a per-file
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* control, is selecting huge page allocations ("huge=within_size").
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* However, we only do so on platforms which benefit from it, or to
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* offset the overhead of iommu lookups, where with latter it is a net
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* win even on platforms which would otherwise see some performance
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* regressions such a slow reads issue on Broadwell and Skylake.
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*/
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if (GRAPHICS_VER(i915) < 11 && !i915_vtd_active(i915))
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return;
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if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
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goto err;
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type = get_fs_type("tmpfs");
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if (!type)
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goto err;
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gemfs = vfs_kern_mount(type, SB_KERNMOUNT, type->name, huge_opt);
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if (IS_ERR(gemfs))
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goto err;
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i915->mm.gemfs = gemfs;
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drm_info(&i915->drm, "Using Transparent Hugepages\n");
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return;
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err:
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drm_notice(&i915->drm,
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"Transparent Hugepage support is recommended for optimal performance%s\n",
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GRAPHICS_VER(i915) >= 11 ? " on this platform!" :
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" when IOMMU is enabled!");
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}
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void i915_gemfs_fini(struct drm_i915_private *i915)
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{
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kern_unmount(i915->mm.gemfs);
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}
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