/* SPDX-License-Identifier: GPL-2.0 */
/*
* channel program interfaces
*
* Copyright IBM Corp . 2017
*
* Author ( s ) : Dong Jia Shi < bjsdjshi @ linux . vnet . ibm . com >
* Xiao Feng Ren < renxiaof @ linux . vnet . ibm . com >
*/
#ifndef _VFIO_CCW_CP_H_
#define _VFIO_CCW_CP_H_
#include <asm /cio.h>
#include <asm /scsw.h>
#include "orb.h"
#include "vfio_ccw_trace.h"
/*
* Max length for ccw chain .
* XXX : Limit to 256 , need to check more ?
*/
#define CCWCHAIN_LEN_MAX 256
/**
* struct channel_program - manage information for channel program
* @ ccwchain_list : list head of ccwchains
* @ orb : orb for the currently processed ssch request
* @ initialized : whether this instance is actually initialized
*
* @ ccwchain_list is the head of a ccwchain list , that contents the
* translated result of the guest channel program that pointed out by
* the iova parameter when calling cp_init .
*/
struct channel_program {
struct list_head ccwchain_list;
union orb orb;
bool initialized;
struct ccw1 *guest_cp;
};
int cp_init(struct channel_program *cp, union orb *orb);
void cp_free(struct channel_program *cp);
int cp_prefetch(struct channel_program *cp);
union orb *cp_get_orb(struct channel_program *cp, struct subchannel *sch);
void cp_update_scsw(struct channel_program *cp, union scsw *scsw);
bool cp_iova_pinned(struct channel_program *cp, u64 iova, u64 length);
#endif
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