a7f46d5b91
Continuation of the effort to declutter i915_drv.h. Also, component specific helpers which consult the iommu/virtualization helpers moved to respective component source/header files as appropriate. v2: * s/dev_priv/i915/ in intel_scanout_needs_vtd_wa. (Lucas) Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Jani Nikula <jani.nikula@intel.com> Cc: Lucas De Marchi <lucas.demarchi@intel.com> Acked-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220329090204.2324499-1-tvrtko.ursulin@linux.intel.com [tursulin: fixup conflict in i915_drv.h]
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/*
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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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int 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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char *opts;
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type = get_fs_type("tmpfs");
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if (!type)
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return -ENODEV;
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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 to offset the overhead of iommu lookups
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* due to bandwidth issues (slow reads) on Broadwell+.
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*/
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opts = NULL;
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if (i915_vtd_active(i915)) {
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if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
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opts = huge_opt;
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drm_info(&i915->drm,
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"Transparent Hugepage mode '%s'\n",
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opts);
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} else {
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drm_notice(&i915->drm,
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"Transparent Hugepage support is recommended for optimal performance when IOMMU is enabled!\n");
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}
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}
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gemfs = vfs_kern_mount(type, SB_KERNMOUNT, type->name, opts);
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if (IS_ERR(gemfs))
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return PTR_ERR(gemfs);
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i915->mm.gemfs = gemfs;
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return 0;
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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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