[PATCH v2 01/10] s390/cio: Export information about Endpoint-Security Capability

Stefan Haberland
2020-10-08T13:13:43Z

From: Sebastian Ott <sebott@linux.ibm.com>

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

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
[vneethv@linux.ibm.com: cleaned-up & modified description]
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
---
drivers/s390/cio/chp.c | 15 +++++++++++++++
drivers/s390/cio/chsc.h | 3 ++-
2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c
index dfcbe54591fb..8d0de6adcad0 100644
--- a/drivers/s390/cio/chp.c
+++ b/drivers/s390/cio/chp.c
@@ -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 = {
diff --git a/drivers/s390/cio/chsc.h b/drivers/s390/cio/chsc.h
index 7ecf7e4c402e..4f049d17355d 100644
--- a/drivers/s390/cio/chsc.h
+++ b/drivers/s390/cio/chsc.h
@@ -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;
--
2.17.1