Allow iommu bus ops to be unregistered revert iommu arm smmu. Vhostuser for integration of qemukvm with an userspace ethernet switch. Same strategy is adopted by the other drivers, such as intel iommu. Say y here if your soc includes an iommu device implementing the arm smmu architecture. Make arm smmu v3 explicitly nonmodular revert iommu arm smmu.
Hi all, this series introduces a generic iommu page table allocation framework, implements support for arm longdescriptors and then. Restrict domain attributes to unmanaged domains iommu arm smmu. Dec 02, 2019 the iommu updates acknowledge, this gets rid of quite some code in the driver itself, but also has some potential for regressions non are known at the moment. Same strategy is adopted by the other drivers, such as inteliommu. Other system architectures also have similar iommu capability, such as amd iommu, arm smmu. This is done using device links between smmu and client devices.
Can we paravirtualize the access to shared status control registers smmu. The iommu updates acknowledge, this gets rid of quite some code in the driver itself, but also has some potential for regressions non are known at the moment. Make armsmmuv3 explicitly nonmodular revert iommuarmsmmu. The iommu api currently leaves iova management entirely up to. The smmu may also raise interrupts in response to various fault conditions. This section shows how stage 2 translation allows a hypervisor to control the view of memory in a vm. Share aarch64 page tables created by linux with smmu. Mark the queue head as unowned, which tells us the range that we are responsible for publishing. Prevent forced unbinding of arm smmu drivers iommuarmsmmuv3. The smmu looks like it tries to provide multiple permissions.
Introduction to edk ii the uefi specification uefi has been adopted in most server, pc, mobile and tablet systems. This preface introduces the arm system memory management unit architecture specification. Hafnium currently has an iommu driver model but no public implementations. Arms developer website includes documentation, tutorials, support resources and more.
Where i can find stepbystep instruction how to init smmu paipa translation. This series provides the support for turning on the armsmmus clockspower domains using runtime pm. Smmu initialization cortexa aprofile forum arm community. In the future it should be possible to share pointersaddresses between the cortex a53s and the fpga utilizing the built in arm smmu 500 iommu and the cache coherent interface cci without any user action necessary.
Arm smmu model specific some key enablers are missing in the hw spec for vfio integration. Make arm smmu explicitly nonmodular iommu arm smmu. Restrict domain attributes to unmanaged domains iommuarmsmmu. Or do we need to virtualize the register access we dont like this. The iommu driver allocates a pasid and the device uses it in dma transactions. Like a traditional mmu, which translates cpu visible virtual addresses to physical addresses, the iommu maps devicevisible virtual addresses also called. Smmu otherwise known as iommu support allows systems to share aprofile page tables with peripherals, providing virtual device support compatibility at the. Jul 27, 2018 if theres still a chance can you please consider pulling this for v4. Iommu api for arm architected smmuv3 implementations. Cttw, and you will find that even though arm strongly recommends the inclusion of coherent translation table walks, in smmu 500 the reset. This is still workinprogress driver and only compile. Basic smmu questions with custom ip community forums.
Iommu api for arm architected smmu implementations. Contribute to torvaldslinux development by creating an account on github. This driver is powered by bad coffee and bombay mix. Avoid pathological rpm behaviour for unmaps robin murphy. Linux drivers device tree guide embedded linux wiki. This chapter explains why the current vfio integration qemu vfio pci device kernel vfio pci driver does not work for arm. Smmu otherwise known as iommu support allows systems to share aprofile page tables with peripherals, providing virtual device support compatibility at the system level with the arm architecture memory model.
This debugfs support was introduced by the iommu pr. Like a traditional mmu, which translates cpuvisible virtual addresses to physical addresses, the iommu maps devicevisible virtual addresses also called device addresses or. Assuming we can agree on the relevance of adding that functionality at iommu api level, maybe we can create a separate. Host virtioiommu device vfio memreserve guest m em ese. To narrow things down i uninstalled the amd chipset drivers, reverted back to a microsoft standard ahci controller for the amd driver and turned of the iommu in the bios. Also worth noting is that this kernel is bringing faster arm iommu performance. With procedure description i checked arm system memory management document, but i was not found exact instruction how to setup correct translation. This is still workinprogress driver and only compile tested. These internal intel iommu data structures previously werent exposed nicely to userspace but now will be with linux 4. Fetching contributors cannot retrieve contributors at this time. We should include an implementation for the standard arm smmuv2 or maybe another version. The arm corelink system mmu provides memory management services to soc bus masters to complement those provided by the cortexa series processors. This series requires to support all three features.
Use nonsecure register for flushing iommu tegra smmu. I need to translate physical address 0x60 0000 0000. The mmu500 is implemented as a distributed design with one or more tbus communicating to a single centralized tcu that. The device link framework keeps the two devices in correct order. A system memory management unitsmmu performs a task analogous to a cpu s mmu, translating addresses for device requests from system io devices before the requests are passed into the system interconnect. I need to translate physical address 0x60 0000 0000 gpu base address to virtual address 0x3000 0000.
Arm adds shared virtual addressing sva for iommu to linux. Better intel iommu debugging is on the way, arm iommu. The arm smmu driver now uses generic deferred flushing and faster iova allocation code. Arm system mmu architecture implementation arm socs may. This gets rid of quite some code in the driver itself, but also has some potential for. Over the next few months we will be adding more developer resources and documentation for all the products and technologies that arm provides. Testing vfio platform with the pl330 dma controller on arm. How to setup kvm virtualization on samsung chromebook.
Most of the iommu driver also takes this as a design assumption. Here, arm delegates the protection to each master and slave device with the bus controller propagating the permission. Aug 30, 2018 the device link framework keeps the two devices in correct order for powercycling across runtime pm or across systemwide pm. Wait for all commands in our owned range to become valid. The core mm handles translation faults from the iommu. Vfio for smmu or iommu to enable kvm on arm device assignment. For that reason the irq remapping hw is abstracted by iommu drivers. That file was not part of the compilation database.
And i found that iommu is a key hardware component for. Mmu and iommu implement compatible page table formats. Similar to gic developments, support is evolving to cater for the increasing complexity in larger systems. Different functionality between arm smmu and x86 iommu. Bhargav shah this patch adds arm smmu 500 support in drivers. Arm system memory management unit architecture specification. Better intel iommu debugging is on the way, arm iommu working. Allow iommu bus ops to be unregistered revert iommuarmsmmu. Prevent forced unbinding of arm smmu drivers iommu arm smmu v3. Say y here if your soc includes an iommu device implementing. Io page faults iopf, for example pci pri page request interface or arm smmu stall.
The armsmmu driver now uses generic deferred flushing and faster iova allocation code. In computing, an inputoutput memory management unit iommu is a memory management unit mmu that connects a directmemoryaccesscapable dmacapable io bus to the main memory. I think it is a problem of cache coherency when sharing the page table between mmu and smmu. The corelink mmu500 supports the translation formats of armv7 and armv8 architectures and performs stage 1, stage 2, or stage 1 followed by stage 2 translations for all page sizes except 16kb page granule for armv8. This is commonly used to number devices, although the practice is controversial. This should take care of restoring the state of smmu in systems. Support for implementations of the arm system mmu architecture. Arm adds shared virtual addressing sva for iommu to. Share aarch64 page tables created by linux with smmu cortex. I have arm cortexa7 mp with smmuv1 where gpu is located. Using iommu for dma protection in uefi firmware intel. Bhargav shah this patch adds arm smmu500 support in drivers.
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