Messages in this thread | | | Subject | Re: [PATCH v2 1/1] iommu/vt-d: Add Kconfig option to enable/disable scalable mode | From | Qian Cai <> | Date | Fri, 8 Nov 2019 22:59:01 -0500 |
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> On Nov 8, 2019, at 10:40 PM, Lu Baolu <baolu.lu@linux.intel.com> wrote: > > 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.
Maybe a sentence or two to describe what the scalable mode is in layman's terms could be useful, so developers don’t need to search around for the Kconfig selection?
> + > 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 > > _______________________________________________ > iommu mailing list > iommu@lists.linux-foundation.org > https://lists.linuxfoundation.org/mailman/listinfo/iommu
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