iommu/vt-d: Add Kconfig option to enable/disable scalable mode
This adds Kconfig option INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON to make it easier for distributions to enable or disable the Intel IOMMU scalable mode by default during kernel build. Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -248,6 +248,18 @@ config INTEL_IOMMU_FLOPPY_WA
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workaround will setup a 1:1 mapping for the first
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16MiB to make floppy (an ISA device) work.
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config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
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bool "Enable Intel IOMMU scalable mode by default"
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depends on INTEL_IOMMU
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help
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Selecting this option will enable by default the scalable mode if
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hardware presents the capability. The scalable mode is defined in
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VT-d 3.0. The scalable mode capability could be checked by reading
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/sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option
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is not selected, scalable mode support could also be enabled by
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passing intel_iommu=sm_on to the kernel. If not sure, please use
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the default value.
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config IRQ_REMAP
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bool "Support for Interrupt Remapping"
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depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
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@ -355,9 +355,14 @@ static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
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int dmar_disabled = 0;
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#else
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int dmar_disabled = 1;
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#endif /*CONFIG_INTEL_IOMMU_DEFAULT_ON*/
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#endif /* CONFIG_INTEL_IOMMU_DEFAULT_ON */
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#ifdef INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
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int intel_iommu_sm = 1;
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#else
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int intel_iommu_sm;
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#endif /* INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON */
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int intel_iommu_enabled = 0;
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EXPORT_SYMBOL_GPL(intel_iommu_enabled);
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