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The ISSEI (Intel Silicon Security Engine Interface) subsystem provides a communication channel between the host and the Silicon Security Engine. Prepare basic driver functions and character device for user-space communication. Add DMA access routines for ISSEI HECI devices. Add of DMA-related structures and implementation of routines for setting up DMA, as well as reading and writing DMA buffers. Reviewed-by: Karol Wachowski <[email protected]> Co-developed-by: Vitaly Lubart <[email protected]> Signed-off-by: Vitaly Lubart <[email protected]> Signed-off-by: Alexander Usyskin <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>