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 | ||