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/* 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
/*
* Maximum number of chains
*/
#define CCWCHAIN_COUNT_MAX 16
/**
* 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
* @guest_cp: copy of guest channel program
* @ccwchain_count: number of channel program segments (linked by TIC)
* @guest_iova: first data address of a guest channel program
*
* @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;
unsigned int ccwchain_count;
u64 guest_iova;
};
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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