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fwctl provides a fwctl_ops->fw_rpc() callback in order to issue ioctls to a device. The cxl fwctl driver will start by supporting the CXL Feature commands: Get Supported Features, Get Feature, and Set Feature. The fw_rpc() callback provides 'enum fwctl_rpc_scope' parameter where it indicates the security scope of the call. The Get Supported Features and Get Feature calls can be executed with the scope of FWCTL_RPC_CONFIGRATION. The Set Feature call is gated by the effects of the Feature reported by Get Supported Features call for the specific Feature. Only "Get Supported Features" is supported in this patch. Additional commands will be added in follow on patches. "Get Supported Features" will filter the Features that are exclusive to the kernel. The flag field of the Feature details will be cleared of the "Changeable" field and the "set feat size" will be set to 0 to indicate that the feature is not changeable. Link: https://patch.msgid.link/r/20250307205648.1021626-4-dave.jiang@intel.com Reviewed-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Li Ming <ming.li@zohomail.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.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.