[PATCH 01/10] s390/cio: Export information about Endpoint-Security Capability
From: Stefan Haberland <sth@linux.ibm.com>
Date: 2020-10-02 19:39:50
Also in:
linux-s390
Subsystem:
s390 architecture, s390 common i/o layer, the rest · Maintainers:
Heiko Carstens, Vasily Gorbik, Alexander Gordeev, Vineeth Vijayan, Peter Oberparleiter, Linus Torvalds
From: Sebastian Ott <redacted> 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 Reference-ID: IO1812 Signed-off-by: Sebastian Ott <redacted> [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> 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