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s390: Add a mechanism to get the subchannel id. 

This will be needed by the new virtio-ccw transport.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Cornelia Huck 2012-05-30 16:03:22 +02:00 committed by Martin Schwidefsky
parent 36eb2caa7b
commit 9368dac436
2 changed files with 17 additions and 0 deletions
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5
arch/s390/include/asm/ccwdev.h
View File

@ -18,6 +18,9 @@ struct irb;
struct ccw1;
struct ccw_dev_id;
/* from asm/schid.h */
struct subchannel_id;
/* simplified initializers for struct ccw_device:
* CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one
* entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */
@ -226,5 +229,7 @@ int ccw_device_siosl(struct ccw_device *);
// FIXME: these have to go
extern int _ccw_device_get_subchannel_number(struct ccw_device *);
extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *);
extern void *ccw_device_get_chp_desc(struct ccw_device *, int);
#endif /* _S390_CCWDEV_H_ */

12
drivers/s390/cio/device_ops.c
View File

@ -763,6 +763,18 @@ _ccw_device_get_subchannel_number(struct ccw_device *cdev)
return cdev->private->schid.sch_no;
}
/**
* ccw_device_get_schid - obtain a subchannel id
* @cdev: device to obtain the id for
* @schid: where to fill in the values
*/
void ccw_device_get_schid(struct ccw_device *cdev, struct subchannel_id *schid)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
*schid = sch->schid;
}
EXPORT_SYMBOL_GPL(ccw_device_get_schid);
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(ccw_device_set_options_mask);