From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/gpu/drm/i915/gem/i915_gemfs.c | 60 +++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 drivers/gpu/drm/i915/gem/i915_gemfs.c (limited to 'drivers/gpu/drm/i915/gem/i915_gemfs.c') diff --git a/drivers/gpu/drm/i915/gem/i915_gemfs.c b/drivers/gpu/drm/i915/gem/i915_gemfs.c new file mode 100644 index 0000000000..46b9a17d6a --- /dev/null +++ b/drivers/gpu/drm/i915/gem/i915_gemfs.c @@ -0,0 +1,60 @@ +/* + * SPDX-License-Identifier: MIT + * + * Copyright © 2017 Intel Corporation + */ + +#include +#include + +#include "i915_drv.h" +#include "i915_gemfs.h" +#include "i915_utils.h" + +void i915_gemfs_init(struct drm_i915_private *i915) +{ + char huge_opt[] = "huge=within_size"; /* r/w */ + struct file_system_type *type; + struct vfsmount *gemfs; + + /* + * By creating our own shmemfs mountpoint, we can pass in + * mount flags that better match our usecase. + * + * One example, although it is probably better with a per-file + * control, is selecting huge page allocations ("huge=within_size"). + * However, we only do so on platforms which benefit from it, or to + * offset the overhead of iommu lookups, where with latter it is a net + * win even on platforms which would otherwise see some performance + * regressions such a slow reads issue on Broadwell and Skylake. + */ + + if (GRAPHICS_VER(i915) < 11 && !i915_vtd_active(i915)) + return; + + if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) + goto err; + + type = get_fs_type("tmpfs"); + if (!type) + goto err; + + gemfs = vfs_kern_mount(type, SB_KERNMOUNT, type->name, huge_opt); + if (IS_ERR(gemfs)) + goto err; + + i915->mm.gemfs = gemfs; + drm_info(&i915->drm, "Using Transparent Hugepages\n"); + return; + +err: + drm_notice(&i915->drm, + "Transparent Hugepage support is recommended for optimal performance%s\n", + GRAPHICS_VER(i915) >= 11 ? " on this platform!" : + " when IOMMU is enabled!"); +} + +void i915_gemfs_fini(struct drm_i915_private *i915) +{ + kern_unmount(i915->mm.gemfs); +} -- cgit v1.2.3