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The BCM2712 root complexes can interpret priority signalling in two different ways, based on the incoming Traffic Class of a TLP. The TLP TCs are assigned to separate internal request/response queues, and assigned different AXI IDs. These queues can have outgoing AXI transactions tagged based on: - Static QoS values - Dynamic QoS through internal backpressure - Dynamic QoS with elevation based on Vendor Messages received by the RC The VDM mechanism is of limited use due to implementation bugs, but the implicit reordering due to separate ID assignment allows higher-priority traffic from an EP to overtake other traffic in the RC and rest of the system. RP1 assigns TCs based on its internal bus managers, and internally tags read requests to allow out-of-order completions, so these two features operate in concert to provide priority service to e.g. MIPI camera or display traffic. Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
Linux kernel
There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first.
In order to build the documentation, use make htmldocs or
make pdfdocs. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation.
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.
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