diff options
| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2016-06-23 11:58:15 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-05-23 09:06:56 +0300 |
| commit | 199652309a4d6635fca19d7528d73ab9e219bd9a (patch) | |
| tree | 65a98a1d959e122d596b1fb12464d5d9cf9eb489 /drivers/s390/cio/device_ops.c | |
| parent | 1c21765cb3aeb17a90bfc494a63abbd4c31480bf (diff) | |
| download | linux-199652309a4d6635fca19d7528d73ab9e219bd9a.tar.xz | |
s390/cio: add helper to query utility strings per given ccw device
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/device_ops.c')
| -rw-r--r-- | drivers/s390/cio/device_ops.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c index aecfebb74157..4435ae0b3027 100644 --- a/drivers/s390/cio/device_ops.c +++ b/drivers/s390/cio/device_ops.c @@ -473,6 +473,36 @@ struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *cdev, } /** + * 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 * @dev_id: where to fill in the values @@ -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); |