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71189f263f
When we get a solicited interrupt, the start function may have been cleared by a csch, but we still have a channel program structure allocated. Make it safe to call the cp accessors in any case, so we can call them unconditionally. While at it, also make sure that functions called from other parts of the code return gracefully if the channel program structure has not been initialized (even though that is a bug in the caller). Reviewed-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Farhan Ali <alifm@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* channel program interfaces
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*
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* Copyright IBM Corp. 2017
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*
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* Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
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* Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
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*/
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#ifndef _VFIO_CCW_CP_H_
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#define _VFIO_CCW_CP_H_
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#include <asm/cio.h>
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#include <asm/scsw.h>
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#include "orb.h"
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/**
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* struct channel_program - manage information for channel program
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* @ccwchain_list: list head of ccwchains
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* @orb: orb for the currently processed ssch request
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* @mdev: the mediated device to perform page pinning/unpinning
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* @initialized: whether this instance is actually initialized
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*
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* @ccwchain_list is the head of a ccwchain list, that contents the
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* translated result of the guest channel program that pointed out by
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* the iova parameter when calling cp_init.
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*/
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struct channel_program {
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struct list_head ccwchain_list;
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union orb orb;
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struct device *mdev;
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bool initialized;
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};
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extern int cp_init(struct channel_program *cp, struct device *mdev,
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union orb *orb);
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extern void cp_free(struct channel_program *cp);
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extern int cp_prefetch(struct channel_program *cp);
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extern union orb *cp_get_orb(struct channel_program *cp, u32 intparm, u8 lpm);
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extern void cp_update_scsw(struct channel_program *cp, union scsw *scsw);
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extern bool cp_iova_pinned(struct channel_program *cp, u64 iova);
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#endif
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