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00b3e8480b
Add support for a generic ioctl read/write interface using which users can request firmware to perform read/write operations on a protected and secure address space. The functionality is introduced through the means of two new IOCTL IDs which extend the existing PM_IOCTL EEMI API: - IOCTL_READ_REG - IOCTL_MASK_WRITE_REG The caller only passes the node id of the given device and an offset. The base address is not exposed to the caller and internally retrieved by the firmware. Firmware will enforce an access policy on the incoming read/write request. Signed-off-by: Izhar Ameer Shaikh <izhar.ameer.shaikh@amd.com> Reviewed-by: Tanmay Shah <tanmay.shah@amd.com> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com> Signed-off-by: Ajay Neeli <ajay.neeli@amd.com> Acked-by: Senthil Nathan Thangaraj <senthilnathan.thangaraj@amd.com> Acked-by: Michal Simek <michal.simek@amd.com> Acked-by: Bart Van Assche <bvanassche@acm.org> Link: https://patch.msgid.link/20251021113003.13650-3-ajay.neeli@amd.com Signed-off-by: Martin K. Petersen <martin.petersen@oracle.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 reStructuredText 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.