Commit 04618252 authored by Lu Baolu's avatar Lu Baolu Committed by Joerg Roedel
Browse files

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: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 46cf053e

drivers/iommu/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -248,6 +248,18 @@ config INTEL_IOMMU_FLOPPY_WA 
	  workaround will setup a 1:1 mapping for the first

	  16MiB to make floppy (an ISA device) work.



config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON

	bool "Enable Intel IOMMU scalable mode by default"

	depends on INTEL_IOMMU

	help

	  Selecting this option will enable by default the scalable mode if

	  hardware presents the capability. The scalable mode is defined in

	  VT-d 3.0. The scalable mode capability could be checked by reading

	  /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option

	  is not selected, scalable mode support could also be enabled by

	  passing intel_iommu=sm_on to the kernel. If not sure, please use

	  the default value.



config IRQ_REMAP

	bool "Support for Interrupt Remapping"

	depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI

drivers/iommu/intel-iommu.c

+6 −1
Original line number Diff line number Diff line
@@ -357,7 +357,12 @@ int dmar_disabled = 0; 
int dmar_disabled = 1;

#endif /* CONFIG_INTEL_IOMMU_DEFAULT_ON */



#ifdef INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON

int intel_iommu_sm = 1;

#else

int intel_iommu_sm;

#endif /* INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON */



int intel_iommu_enabled = 0;

EXPORT_SYMBOL_GPL(intel_iommu_enabled);

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