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To provide user-space a set of interfaces to: 1. pass in a ccw program to perform an I/O operation. 2. read back I/O results of the completed I/O operations. We introduce an MMIO region for the vfio-ccw device here. This region is defined to content: 1. areas to store arguments that an ssch required. 2. areas to store the I/O results. Using pwrite/pread to the device on this region, a user-space program could write/read data to/from the vfio-ccw device. Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com> Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> Message-Id: <20170317031743.40128-8-bjsdjshi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
40 lines
1,004 B
C
40 lines
1,004 B
C
/*
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* Private stuff for vfio_ccw driver
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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_PRIVATE_H_
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#define _VFIO_CCW_PRIVATE_H_
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#include <linux/vfio_ccw.h>
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#include "css.h"
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/**
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* struct vfio_ccw_private
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* @sch: pointer to the subchannel
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* @completion: synchronization helper of the I/O completion
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* @avail: available for creating a mediated device
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* @mdev: pointer to the mediated device
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* @nb: notifier for vfio events
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* @io_region: MMIO region to input/output I/O arguments/results
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*/
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struct vfio_ccw_private {
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struct subchannel *sch;
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struct completion *completion;
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atomic_t avail;
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struct mdev_device *mdev;
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struct notifier_block nb;
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struct ccw_io_region io_region;
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} __aligned(8);
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extern int vfio_ccw_mdev_reg(struct subchannel *sch);
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extern void vfio_ccw_mdev_unreg(struct subchannel *sch);
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extern int vfio_ccw_sch_quiesce(struct subchannel *sch);
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#endif
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