650d160382
This patch includes "gsi.c", which implements the generic software interface (GSI) for IPA. The generic software interface abstracts channels, which provide a means of transferring data either from the AP to the IPA, or from the IPA to the AP. A ring buffer of "transfer elements" (TREs) is used to describe data transfers to perform. The AP writes a doorbell register associated with a channel to let it know it has added new entries (for an AP->IPA channel) or has finished processing entries (for an IPA->AP channel). Each channel also has an event ring buffer, used by the IPA to communicate information about events related to a channel (for example, the completion of TREs). The IPA writes its own doorbell register, which triggers an interrupt on the AP, to signal that new event information has arrived. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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.