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.
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| 1 | +/* | |
| 2 | + * Interfaces for vfio-ccw | |
| 3 | + * | |
| 4 | + * Copyright IBM Corp. 2017 | |
| 5 | + * | |
| 6 | + * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> | |
| 7 | + */ | |
| 8 | + | |
| 9 | +#ifndef _VFIO_CCW_H_ | |
| 10 | +#define _VFIO_CCW_H_ | |
| 11 | + | |
| 12 | +#include <linux/types.h> | |
| 13 | + | |
| 14 | +struct ccw_io_region { | |
| 15 | +#define ORB_AREA_SIZE 12 | |
| 16 | + __u8 orb_area[ORB_AREA_SIZE]; | |
| 17 | +#define SCSW_AREA_SIZE 12 | |
| 18 | + __u8 scsw_area[SCSW_AREA_SIZE]; | |
| 19 | +#define IRB_AREA_SIZE 96 | |
| 20 | + __u8 irb_area[IRB_AREA_SIZE]; | |
| 21 | + __u32 ret_code; | |
| 22 | +} __packed; | |
| 23 | + | |
| 24 | +#endif | |