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Even though there is no any real NTB hardware, which would have both more than two ports and Scratchpad registers, it is logically correct to have Scratchpad API accepting a peer port index as well. Intel/AMD drivers utilize Primary and Secondary topology to split Scratchpad between connected root devices. Since port-index API introduced, Intel/AMD NTB hardware drivers can use device port to determine which Scratchpad registers actually belong to local and peer devices. The same approach can be used if some potential hardware in future will be multi-port and have some set of Scratchpads. Here are the brief of changes in the API: ntb_spad_count() - return number of Scratchpads per each port ntb_peer_spad_addr(pidx, sidx) - address of Scratchpad register of the peer device with pidx-index ntb_peer_spad_read(pidx, sidx) - read specified Scratchpad register of the peer with pidx-index ntb_peer_spad_write(pidx, sidx) - write data to Scratchpad register of the peer with pidx-index Since there is hardware which doesn't support Scratchpad registers, the corresponding API methods are now made optional. Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Allen Hubbe <Allen.Hubbe@dell.com> Signed-off-by: Jon Mason <jdmason@kudzu.us> |
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README
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.