Messages in this thread | | | Subject | Re: [PATCH v2 1/1] iommu/vt-d: Add Kconfig option to enable/disable scalable mode | From | Lu Baolu <> | Date | Mon, 11 Nov 2019 09:27:42 +0800 |
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Hi,
On 11/9/19 11:59 AM, Qian Cai wrote: > > >> 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?
How about "pasid based multiple stages DMA translation"?
Best regards, baolu
> >> + >> 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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