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Subject[PATCH v2 1/1] iommu/vt-d: Add Kconfig option to enable/disable scalable mode
Date
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>
---
drivers/iommu/Kconfig | 9 +++++++++
drivers/iommu/intel-iommu.c | 7 ++++++-
2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index e3842eabcfdd..fbdf3fd291d9 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -242,6 +242,15 @@ 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
+ prompt "Enable Intel IOMMU scalable mode by default"
+ depends on INTEL_IOMMU
+ help
+ Selecting this option will enable the scalable mode if
+ hardware presents the capability. If this option is not
+ selected, scalable mode support could also be enabled
+ by passing intel_iommu=sm_on to the kernel.
+
config IRQ_REMAP
bool "Support for Interrupt Remapping"
depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 6db6d969e31c..6051fe790c61 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -355,9 +355,14 @@ static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
int dmar_disabled = 0;
#else
int dmar_disabled = 1;
-#endif /*CONFIG_INTEL_IOMMU_DEFAULT_ON*/
+#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);

--
2.17.1
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