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s390/cio: add helper to query utility strings per given ccw device

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Signed-off-by: Sebastian Ott <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Sebastian Ott authored and Martin Schwidefsky committed 2018-05-23 08:06:56 +02:00
1 parent 1c21765cb3
commit 199652309a
2 files changed
+32
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arch/s390/include/asm/ccwdev.h
+1
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@@ -231,4 +231,5 @@ int ccw_device_siosl(struct ccw_device *);
extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *);
struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *, int);
u8 *ccw_device_get_util_str(struct ccw_device *cdev, int chp_idx);
#endif /* _S390_CCWDEV_H_ */
drivers/s390/cio/device_ops.c
+31
View File
@@ -472,6 +472,36 @@ struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *cdev,
return chp_get_chp_desc(chpid);
}
/**
* ccw_device_get_util_str() - return newly allocated utility strings
* @cdev: device to obtain the utility strings for
* @chp_idx: index of the channel path
*
* On success return a newly allocated copy of the utility strings
* associated with the given channel path. Return %NULL on error.
*/
u8 *ccw_device_get_util_str(struct ccw_device *cdev, int chp_idx)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct channel_path *chp;
struct chp_id chpid;
u8 *util_str;
chp_id_init(&chpid);
chpid.id = sch->schib.pmcw.chpid[chp_idx];
chp = chpid_to_chp(chpid);
util_str = kmalloc(sizeof(chp->desc_fmt3.util_str), GFP_KERNEL);
if (!util_str)
return NULL;
mutex_lock(&chp->lock);
memcpy(util_str, chp->desc_fmt3.util_str, sizeof(chp->desc_fmt3.util_str));
mutex_unlock(&chp->lock);
return util_str;
}
/**
* ccw_device_get_id() - obtain a ccw device id
* @cdev: device to obtain the id for
@@ -682,3 +712,4 @@ EXPORT_SYMBOL(ccw_device_start_key);
EXPORT_SYMBOL(ccw_device_get_ciw);
EXPORT_SYMBOL(ccw_device_get_path_mask);
EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc);
EXPORT_SYMBOL_GPL(ccw_device_get_util_str);