| # IOMMU_API always gets selected by whoever wants it. |
| config IOMMU_API |
| bool |
| |
| menuconfig IOMMU_SUPPORT |
| bool "IOMMU Hardware Support" |
| default y |
| ---help--- |
| Say Y here if you want to compile device drivers for IO Memory |
| Management Units into the kernel. These devices usually allow to |
| remap DMA requests and/or remap interrupts from other devices on the |
| system. |
| |
| if IOMMU_SUPPORT |
| |
| # MSM IOMMU support |
| config MSM_IOMMU |
| bool "MSM IOMMU Support" |
| depends on ARCH_MSM8X60 || ARCH_MSM8960 |
| select IOMMU_API |
| help |
| Support for the IOMMUs found on certain Qualcomm SOCs. |
| These IOMMUs allow virtualization of the address space used by most |
| cores within the multimedia subsystem. |
| |
| If unsure, say N here. |
| |
| config IOMMU_PGTABLES_L2 |
| def_bool y |
| depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n |
| |
| # AMD IOMMU support |
| config AMD_IOMMU |
| bool "AMD IOMMU support" |
| select SWIOTLB |
| select PCI_MSI |
| select PCI_IOV |
| select IOMMU_API |
| depends on X86_64 && PCI && ACPI |
| ---help--- |
| With this option you can enable support for AMD IOMMU hardware in |
| your system. An IOMMU is a hardware component which provides |
| remapping of DMA memory accesses from devices. With an AMD IOMMU you |
| can isolate the the DMA memory of different devices and protect the |
| system from misbehaving device drivers or hardware. |
| |
| You can find out if your system has an AMD IOMMU if you look into |
| your BIOS for an option to enable it or if you have an IVRS ACPI |
| table. |
| |
| config AMD_IOMMU_STATS |
| bool "Export AMD IOMMU statistics to debugfs" |
| depends on AMD_IOMMU |
| select DEBUG_FS |
| ---help--- |
| This option enables code in the AMD IOMMU driver to collect various |
| statistics about whats happening in the driver and exports that |
| information to userspace via debugfs. |
| If unsure, say N. |
| |
| # Intel IOMMU support |
| config DMAR |
| bool "Support for DMA Remapping Devices" |
| depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC) |
| select IOMMU_API |
| help |
| DMA remapping (DMAR) devices support enables independent address |
| translations for Direct Memory Access (DMA) from devices. |
| These DMA remapping devices are reported via ACPI tables |
| and include PCI device scope covered by these DMA |
| remapping devices. |
| |
| config DMAR_DEFAULT_ON |
| def_bool y |
| prompt "Enable DMA Remapping Devices by default" |
| depends on DMAR |
| help |
| Selecting this option will enable a DMAR device at boot time if |
| one is found. If this option is not selected, DMAR support can |
| be enabled by passing intel_iommu=on to the kernel. |
| |
| config DMAR_BROKEN_GFX_WA |
| bool "Workaround broken graphics drivers (going away soon)" |
| depends on DMAR && BROKEN && X86 |
| ---help--- |
| Current Graphics drivers tend to use physical address |
| for DMA and avoid using DMA APIs. Setting this config |
| option permits the IOMMU driver to set a unity map for |
| all the OS-visible memory. Hence the driver can continue |
| to use physical addresses for DMA, at least until this |
| option is removed in the 2.6.32 kernel. |
| |
| config DMAR_FLOPPY_WA |
| def_bool y |
| depends on DMAR && X86 |
| ---help--- |
| Floppy disk drivers are known to bypass DMA API calls |
| thereby failing to work when IOMMU is enabled. This |
| workaround will setup a 1:1 mapping for the first |
| 16MiB to make floppy (an ISA device) work. |
| |
| config INTR_REMAP |
| bool "Support for Interrupt Remapping (EXPERIMENTAL)" |
| depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL |
| ---help--- |
| Supports Interrupt remapping for IO-APIC and MSI devices. |
| To use x2apic mode in the CPU's which support x2APIC enhancements or |
| to support platforms with CPU's having > 8 bit APIC ID, say Y. |
| |
| endif # IOMMU_SUPPORT |
