tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * channel program interfaces
4 *
5 * Copyright IBM Corp. 2017
6 *
7 * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
8 * Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
9 */
10
11#ifndef _VFIO_CCW_CP_H_
12#define _VFIO_CCW_CP_H_
13
14#include <asm/cio.h>
15#include <asm/scsw.h>
16
17#include "orb.h"
18
19/*
20 * Max length for ccw chain.
21 * XXX: Limit to 256, need to check more?
22 */
23#define CCWCHAIN_LEN_MAX 256
24
25/**
26 * struct channel_program - manage information for channel program
27 * @ccwchain_list: list head of ccwchains
28 * @orb: orb for the currently processed ssch request
29 * @mdev: the mediated device to perform page pinning/unpinning
30 * @initialized: whether this instance is actually initialized
31 *
32 * @ccwchain_list is the head of a ccwchain list, that contents the
33 * translated result of the guest channel program that pointed out by
34 * the iova parameter when calling cp_init.
35 */
36struct channel_program {
37 struct list_head ccwchain_list;
38 union orb orb;
39 struct device *mdev;
40 bool initialized;
41 struct ccw1 *guest_cp;
42};
43
44extern int cp_init(struct channel_program *cp, struct device *mdev,
45 union orb *orb);
46extern void cp_free(struct channel_program *cp);
47extern int cp_prefetch(struct channel_program *cp);
48extern union orb *cp_get_orb(struct channel_program *cp, u32 intparm, u8 lpm);
49extern void cp_update_scsw(struct channel_program *cp, union scsw *scsw);
50extern bool cp_iova_pinned(struct channel_program *cp, u64 iova);
51
52#endif