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2207e8d480
Add the core implementation for firmware and host client management within the ISSEI (Intel Silicon Security Engine Interface) subsystem support for a character device to expose the ISSEI HECI interface to user space. The firmware client (fw_client) and host client (host_client) modules are responsible for managing communication between the host software and the firmware. The character device provides a communication channel for user-space applications to interact with the firmware on the platform. The client modules enable the ISSEI driver to manage multiple host clients communicating with corresponding firmware clients, facilitating data transfers and control operations over the HECI interface. The character device allows user-space applications to establish connections to firmware clients using UUIDs, exchange messages, and control the communication flow using standard file operation calls. Reviewed-by: Karol Wachowski <karol.wachowski@linux.intel.com> Co-developed-by: Vitaly Lubart <lubvital@gmail.com> Signed-off-by: Vitaly Lubart <lubvital@gmail.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Link: https://patch.msgid.link/20260513-issei-for-upstream-v1-2-f590038678f9@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>