Commit 8b8b0915 authored by Sebastian Ott's avatar Sebastian Ott Committed by Jens Axboe
Browse files

s390/cio: Export information about Endpoint-Security Capability 



Add a new sysfs attribute 'esc' per chpid. This new attribute exports
the Endpoint-Security-Capability byte of channel-path description block,
which could be 0-None, 1-Authentication, 2 and 3-Encryption.

For example:
$ cat /sys/devices/css0/chp0.34/esc
0

[vneethv@linux.ibm.com: cleaned-up & modified description]

Signed-off-by: default avatarSebastian Ott <sebott@linux.ibm.com>
Signed-off-by: default avatarVineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: default avatarStefan Haberland <sth@linux.ibm.com>
Reviewed-by: default avatarJan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: default avatarPeter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: default avatarCornelia Huck <cohuck@redhat.com>
Acked-by: default avatarVasily Gorbik <gor@linux.ibm.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent e2b6b301

drivers/s390/cio/chp.c

+15 −0
Original line number Diff line number Diff line
@@ -384,6 +384,20 @@ static ssize_t chp_chid_external_show(struct device *dev, 
}

static DEVICE_ATTR(chid_external, 0444, chp_chid_external_show, NULL);



static ssize_t chp_esc_show(struct device *dev,

			    struct device_attribute *attr, char *buf)

{

	struct channel_path *chp = to_channelpath(dev);

	ssize_t rc;



	mutex_lock(&chp->lock);

	rc = sprintf(buf, "%x\n", chp->desc_fmt1.esc);

	mutex_unlock(&chp->lock);



	return rc;

}

static DEVICE_ATTR(esc, 0444, chp_esc_show, NULL);



static ssize_t util_string_read(struct file *filp, struct kobject *kobj,

				struct bin_attribute *attr, char *buf,

				loff_t off, size_t count)
@@ -414,6 +428,7 @@ static struct attribute *chp_attrs[] = { 
	&dev_attr_shared.attr,

	&dev_attr_chid.attr,

	&dev_attr_chid_external.attr,

	&dev_attr_esc.attr,

	NULL,

};

static struct attribute_group chp_attr_group = {

drivers/s390/cio/chsc.h

+2 −1
Original line number Diff line number Diff line
@@ -27,7 +27,8 @@ struct channel_path_desc_fmt1 { 
	u8 lsn;

	u8 desc;

	u8 chpid;

	u32:24;

	u32:16;

	u8 esc;

	u8 chpp;

	u32 unused[2];

	u16 chid;