/**
* chp_update_desc - update channel-path description
* @chp - channel-path
*
* Update the channel-path description of the specified channel-path
* including channel measurement related information.
* Return zero on success, non-zero otherwise.
*/
int chp_update_desc(struct channel_path *chp)
{
int rc;
rc = chsc_determine_base_channel_path_desc(chp->chpid, &chp->desc);
if (rc)
return rc;
/*
* Fetching the following data is optional. Not all machines or
* hypervisors implement the required chsc commands.
*/
chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1);
chsc_get_channel_measurement_chars(chp);
return 0;
}
/**
* chp_new - register a new channel-path
* @chpid - channel-path ID
*
* Create and register data structure representing new channel-path. Return
* zero on success, non-zero otherwise.
*/
int chp_new(struct chp_id chpid)
{
struct channel_path *chp;
int ret;
if (chp_is_registered(chpid))
return 0;
chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
if (!chp)
return -ENOMEM;
/* fill in status, etc. */
chp->chpid = chpid;
chp->state = 1;
chp->dev.parent = &channel_subsystems[chpid.cssid]->device;
chp->dev.groups = chp_attr_groups;
chp->dev.release = chp_release;
mutex_init(&chp->lock);
/* Obtain channel path description and fill it in. */
ret = chp_update_desc(chp);
if (ret)
goto out_free;
if ((chp->desc.flags & 0x80) == 0) {
ret = -ENODEV;
goto out_free;
}
/* Get channel-measurement characteristics. */
if (css_chsc_characteristics.scmc && css_chsc_characteristics.secm) {
ret = chsc_get_channel_measurement_chars(chp);
if (ret)
goto out_free;
} else {
chp->cmg = -1;
}
dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id);
/* make it known to the system */
ret = device_register(&chp->dev);
if (ret) {
CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n",
chpid.cssid, chpid.id, ret);
put_device(&chp->dev);
goto out;
}
mutex_lock(&channel_subsystems[chpid.cssid]->mutex);
if (channel_subsystems[chpid.cssid]->cm_enabled) {
ret = chp_add_cmg_attr(chp);
if (ret) {
device_unregister(&chp->dev);
mutex_unlock(&channel_subsystems[chpid.cssid]->mutex);
goto out;
}
}
channel_subsystems[chpid.cssid]->chps[chpid.id] = chp;
mutex_unlock(&channel_subsystems[chpid.cssid]->mutex);
goto out;
out_free:
kfree(chp);
out:
return ret;
}
/**
* chp_new - register a new channel-path
* @chpid - channel-path ID
*
* Create and register data structure representing new channel-path. Return
* zero on success, non-zero otherwise.
*/
int chp_new(struct chp_id chpid)
{
struct channel_path *chp;
int ret;
if (chp_is_registered(chpid))
return 0;
chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
if (!chp)
return -ENOMEM;
/* fill in status, etc. */
chp->chpid = chpid;
chp->state = 1;
chp->dev.parent = &css[chpid.cssid]->device;
chp->dev.release = chp_release;
snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid,
chpid.id);
/* Obtain channel path description and fill it in. */
ret = chsc_determine_channel_path_description(chpid, &chp->desc);
if (ret)
goto out_free;
if ((chp->desc.flags & 0x80) == 0) {
ret = -ENODEV;
goto out_free;
}
/* Get channel-measurement characteristics. */
if (css_characteristics_avail && css_chsc_characteristics.scmc
&& css_chsc_characteristics.secm) {
ret = chsc_get_channel_measurement_chars(chp);
if (ret)
goto out_free;
} else {
static int msg_done;
if (!msg_done) {
printk(KERN_WARNING "cio: Channel measurements not "
"available, continuing.\n");
msg_done = 1;
}
chp->cmg = -1;
}
/* make it known to the system */
ret = device_register(&chp->dev);
if (ret) {
printk(KERN_WARNING "%s: could not register %x.%02x\n",
__func__, chpid.cssid, chpid.id);
goto out_free;
}
ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
if (ret) {
device_unregister(&chp->dev);
goto out_free;
}
mutex_lock(&css[chpid.cssid]->mutex);
if (css[chpid.cssid]->cm_enabled) {
ret = chp_add_cmg_attr(chp);
if (ret) {
sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
device_unregister(&chp->dev);
mutex_unlock(&css[chpid.cssid]->mutex);
goto out_free;
}
}
css[chpid.cssid]->chps[chpid.id] = chp;
mutex_unlock(&css[chpid.cssid]->mutex);
return ret;
out_free:
kfree(chp);
return ret;
}
