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Add pcie_bandwidth_available() to compute the bandwidth available to a device. This may be limited by the device itself or by a slower upstream link leading to the device. The available bandwidth at each link along the path is computed as: link_width * link_speed * (1 - encoding_overhead) 2.5 and 5.0 GT/s links use 8b/10b encoding, which reduces the raw bandwidth available by 20%; 8.0 GT/s and faster links use 128b/130b encoding, which reduces it by about 1.5%. The result is in Mb/s, i.e., megabits/second, of raw bandwidth. Also return the device with the slowest link and the speed and width of that link. Signed-off-by: Tal Gilboa <talgi@mellanox.com> [bhelgaas: changelog, leave pcie_get_minimum_link() alone for now, return bw directly, use pci_upstream_bridge(), check "next_bw <= bw" to find uppermost limiting device, return speed/width of the limiting device] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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.