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Nvlink2 supports address translation services (ATS) allowing devices to request address translations from an mmu known as the nest MMU which is setup to walk the CPU page tables. To access this functionality certain firmware calls are required to setup and manage hardware context tables in the nvlink processing unit (NPU). The NPU also manages forwarding of TLB invalidates (known as address translation shootdowns/ATSDs) to attached devices. This patch exports several methods to allow device drivers to register a process id (PASID/PID) in the hardware tables and to receive notification of when a device should stop issuing address translation requests (ATRs). It also adds a fault handler to allow device drivers to demand fault pages in. Signed-off-by: Alistair Popple <alistair@popple.id.au> [mpe: Fix up comment formatting, use flush_tlb_mm()] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.