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Some IDT NTB-capable PCIe-switches have message registers to communicate with peer devices. This patch adds new NTB API callback methods, which can be used to utilize these registers functionality: ntb_msg_count(); - get number of message registers ntb_msg_inbits(); - get bitfield of inbound message registers status ntb_msg_outbits(); - get bitfield of outbound message registers status ntb_msg_read_sts(); - read the inbound and outbound message registers status ntb_msg_clear_sts(); - clear status bits of message registers ntb_msg_set_mask(); - mask interrupts raised by status bits of message registers. ntb_msg_clear_mask(); - clear interrupts mask bits of message registers ntb_msg_read(midx, *pidx); - read message register with specified index, additionally getting peer port index which data received from ntb_msg_write(midx, pidx); - write data to the specified message register sending it to the passed peer device connected over a pidx port ntb_msg_event(); - notify driver context of a new message event Of course there is hardware which doesn't support Message registers, so this API is 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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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.