# 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 # MSM_IOMMU always gets selected by whoever wants it. config MSM_IOMMU bool # MSM IOMMUv0 support config MSM_IOMMU_V0 bool "MSM IOMMUv0 Support" depends on ARCH_MSM8X60 || ARCH_MSM8960 || ARCH_APQ8064 || ARCH_MSM8610 select IOMMU_API select MSM_IOMMU help Support for the IOMMUs (v0) 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. # MSM IOMMUv1 support config MSM_IOMMU_V1 bool "MSM IOMMUv1 Support" depends on ARCH_MSM8974 || ARCH_MPQ8092 || ARCH_MSM8226 || ARCH_APQ8084 select IOMMU_API select MSM_IOMMU help Support for the IOMMUs (v1) 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. # MSM IOMMU CPU-GPU sync programming support config MSM_IOMMU_GPU_SYNC bool "MSM IOMMU CPU-GPU Sync Support" depends on (ARCH_MSM8X60 || ARCH_MSM8960 || ARCH_APQ8064 || ARCH_MSM8930) && MSM_IOMMU_V0 && MSM_REMOTE_SPINLOCK_SFPB help Say Y here if you want to synchronize access to IOMMU configuration port between CPU and GPU. CPU will grab a remote spinlock before accessing IOMMU configuration registers and GPU will do the same. If unsure, say N here. config MSM_IOMMU_PMON bool "MSM IOMMU Perfomance Monitoring Support" depends on (ARCH_MSM8974 || ARCH_MSM8610 || ARCH_MSM8226) && MSM_IOMMU help Support for monitoring IOMMUs performance on certain Qualcomm SOCs. It captures TLB statistics per context bank of the IOMMU as an indication of its performance metric. If unsure, say N here. config IOMMU_PGTABLES_L2 bool "Allow SMMU page tables in the L2 cache (Experimental)" depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n help Improves TLB miss latency at the expense of potential L2 pollution. However, with large multimedia buffers, the TLB should mostly contain section mappings and TLB misses should be quite infrequent. Most people can probably say Y here. config IOMMU_NON_SECURE bool "Turns on programming of secure SMMU by kernel" depends on MSM_IOMMU help Say Y here if you want the kernel to program all SMMUs regardless of whether SMMUs are secure or not. A secure SMMU is an SMMU that has its global address space programmed by the secure environment. In addition some of the context banks might be owned/programmed by the secure environment for a secure SMMU. Enabling this feature can be used during testing when the secure environment is not available and the kernel needs to program all the SMMUs. If unsure, say N here. # AMD IOMMU support config AMD_IOMMU bool "AMD IOMMU support" select SWIOTLB select PCI_MSI select PCI_ATS select PCI_PRI select PCI_PASID 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. config AMD_IOMMU_V2 tristate "AMD IOMMU Version 2 driver (EXPERIMENTAL)" depends on AMD_IOMMU && PROFILING && EXPERIMENTAL select MMU_NOTIFIER ---help--- This option enables support for the AMD IOMMUv2 features of the IOMMU hardware. Select this option if you want to use devices that support the the PCI PRI and PASID interface. # Intel IOMMU support config DMAR_TABLE bool config INTEL_IOMMU bool "Support for Intel IOMMU using DMA Remapping Devices" depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC) select IOMMU_API select DMAR_TABLE 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 INTEL_IOMMU_DEFAULT_ON def_bool y prompt "Enable Intel DMA Remapping Devices by default" depends on INTEL_IOMMU 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 INTEL_IOMMU_BROKEN_GFX_WA bool "Workaround broken graphics drivers (going away soon)" depends on INTEL_IOMMU && 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 INTEL_IOMMU_FLOPPY_WA def_bool y depends on INTEL_IOMMU && 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 IRQ_REMAP bool "Support for Interrupt Remapping (EXPERIMENTAL)" depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL select DMAR_TABLE ---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. # OMAP IOMMU support config OMAP_IOMMU bool "OMAP IOMMU Support" depends on ARCH_OMAP select IOMMU_API config OMAP_IOVMM tristate "OMAP IO Virtual Memory Manager Support" depends on OMAP_IOMMU config OMAP_IOMMU_DEBUG tristate "Export OMAP IOMMU/IOVMM internals in DebugFS" depends on OMAP_IOVMM && DEBUG_FS help Select this to see extensive information about the internal state of OMAP IOMMU/IOVMM in debugfs. Say N unless you know you need this. config TEGRA_IOMMU_GART bool "Tegra GART IOMMU Support" depends on ARCH_TEGRA_2x_SOC select IOMMU_API help Enables support for remapping discontiguous physical memory shared with the operating system into contiguous I/O virtual space through the GART (Graphics Address Relocation Table) hardware included on Tegra SoCs. config TEGRA_IOMMU_SMMU bool "Tegra SMMU IOMMU Support" depends on ARCH_TEGRA_3x_SOC select IOMMU_API help Enables support for remapping discontiguous physical memory shared with the operating system into contiguous I/O virtual space through the SMMU (System Memory Management Unit) hardware included on Tegra SoCs. endif # IOMMU_SUPPORT