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2add64ebae
This patch defines a new opcode in the DEBUG IOCTL that is used by the user to notify the driver when the user wants to start or stop using the debug and profile infrastructure of the device. i.e. set the device to debug mode or to non-debug mode. There are a couple of restrictions that this new opcode introduces: 1. The user can't configure the debug/profiling infrastructure before he sets the device to debug mode, by using this new opcode. 2. The user can't set the device to debug mode unless he is the only user that is currently using (has an open FD) the device. 3. Other users can't use the device (open a new FD) in case an existing user has set the device into debug mode. These restrictions are needed because the debug and profiling infrastructure is a shared component in the ASIC and therefore, can't be used while multiple users are working on the device. Because the driver currently does NOT support multiple users, the implementation of the restrictions is not required at this point. However, the interface definition is needed in order to avoid changing the user API later on. Signed-off-by: Oded Gabbay <oded.gabbay@gmail.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.