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iommu/vt-d: Add Kconfig option to enable/disable scalable mode

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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>
This commit is contained in:
Lu Baolu 2020-01-02 08:18:02 +08:00 committed by Joerg Roedel
parent 46cf053efe
commit 046182525d
2 changed files with 18 additions and 1 deletions
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12
drivers/iommu/Kconfig
View File

@ -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

5
drivers/iommu/intel-iommu.c
View File

@ -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);