3 files changed, 207 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index 32fc51341d99..16bb135c20aa 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -576,6 +576,11 @@ dasd_create_device(struct ccw_device *cdev)
 	dev_set_drvdata(&cdev->dev, device);
 	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 
+	device->paths_info = kset_create_and_add("paths_info", NULL,
+						 &device->cdev->dev.kobj);
+	if (!device->paths_info)
+		dev_warn(&cdev->dev, "Could not create paths_info kset\n");
+
 	return device;
 }
 
@@ -622,6 +627,9 @@ dasd_delete_device(struct dasd_device *device)
 	wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
 
 	dasd_generic_free_discipline(device);
+
+	kset_unregister(device->paths_info);
+
 	/* Disconnect dasd_device structure from ccw_device structure. */
 	cdev = device->cdev;
 	device->cdev = NULL;
@@ -1641,6 +1649,39 @@ dasd_path_interval_store(struct device *dev, struct device_attribute *attr,
 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show,
 		   dasd_path_interval_store);
 
+static ssize_t
+dasd_device_fcs_show(struct device *dev, struct device_attribute *attr,
+		     char *buf)
+{
+	struct dasd_device *device;
+	int fc_sec;
+	int rc;
+
+	device = dasd_device_from_cdev(to_ccwdev(dev));
+	if (IS_ERR(device))
+		return -ENODEV;
+	fc_sec = dasd_path_get_fcs_device(device);
+	if (fc_sec == -EINVAL)
+		rc = snprintf(buf, PAGE_SIZE, "Inconsistent\n");
+	else
+		rc = snprintf(buf, PAGE_SIZE, "%s\n", dasd_path_get_fcs_str(fc_sec));
+	dasd_put_device(device);
+
+	return rc;
+}
+static DEVICE_ATTR(fc_security, 0444, dasd_device_fcs_show, NULL);
+
+static ssize_t
+dasd_path_fcs_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
+{
+	struct dasd_path *path = to_dasd_path(kobj);
+	unsigned int fc_sec = path->fc_security;
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", dasd_path_get_fcs_str(fc_sec));
+}
+
+static struct kobj_attribute path_fcs_attribute =
+	__ATTR(fc_security, 0444, dasd_path_fcs_show, NULL);
 
 #define DASD_DEFINE_ATTR(_name, _func)					\
 static ssize_t dasd_##_name##_show(struct device *dev,			\
@@ -1697,6 +1738,7 @@ static struct attribute * dasd_attrs[] = {
 	&dev_attr_path_reset.attr,
 	&dev_attr_hpf.attr,
 	&dev_attr_ese.attr,
+	&dev_attr_fc_security.attr,
 	NULL,
 };
 
@@ -1777,6 +1819,73 @@ dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
 }
 EXPORT_SYMBOL(dasd_set_feature);
 
+static struct attribute *paths_info_attrs[] = {
+	&path_fcs_attribute.attr,
+	NULL,
+};
+
+static struct kobj_type path_attr_type = {
+	.release	= dasd_path_release,
+	.default_attrs	= paths_info_attrs,
+	.sysfs_ops	= &kobj_sysfs_ops,
+};
+
+static void dasd_path_init_kobj(struct dasd_device *device, int chp)
+{
+	device->path[chp].kobj.kset = device->paths_info;
+	kobject_init(&device->path[chp].kobj, &path_attr_type);
+}
+
+void dasd_path_create_kobj(struct dasd_device *device, int chp)
+{
+	int rc;
+
+	if (test_bit(DASD_FLAG_OFFLINE, &device->flags))
+		return;
+	if (!device->paths_info) {
+		dev_warn(&device->cdev->dev, "Unable to create paths objects\n");
+		return;
+	}
+	if (device->path[chp].in_sysfs)
+		return;
+	if (!device->path[chp].conf_data)
+		return;
+
+	dasd_path_init_kobj(device, chp);
+
+	rc = kobject_add(&device->path[chp].kobj, NULL, "%x.%02x",
+			 device->path[chp].cssid, device->path[chp].chpid);
+	if (rc)
+		kobject_put(&device->path[chp].kobj);
+	device->path[chp].in_sysfs = true;
+}
+EXPORT_SYMBOL(dasd_path_create_kobj);
+
+void dasd_path_create_kobjects(struct dasd_device *device)
+{
+	u8 lpm, opm;
+
+	opm = dasd_path_get_opm(device);
+	for (lpm = 0x80; lpm; lpm >>= 1) {
+		if (!(lpm & opm))
+			continue;
+		dasd_path_create_kobj(device, pathmask_to_pos(lpm));
+	}
+}
+EXPORT_SYMBOL(dasd_path_create_kobjects);
+
+/*
+ * As we keep kobjects for the lifetime of a device, this function must not be
+ * called anywhere but in the context of offlining a device.
+ */
+void dasd_path_remove_kobj(struct dasd_device *device, int chp)
+{
+	if (device->path[chp].in_sysfs) {
+		kobject_put(&device->path[chp].kobj);
+		device->path[chp].in_sysfs = false;
+	}
+}
+EXPORT_SYMBOL(dasd_path_remove_kobj);
 
 int dasd_add_sysfs_files(struct ccw_device *cdev)
 {
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 3273b26b25b0..cfffab4c627b 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1035,6 +1035,30 @@ static void dasd_eckd_clear_conf_data(struct dasd_device *device)
 		device->path[i].ssid = 0;
 		device->path[i].chpid = 0;
 		dasd_path_notoper(device, i);
+		dasd_path_remove_kobj(device, i);
+	}
+}
+
+static void dasd_eckd_read_fc_security(struct dasd_device *device)
+{
+	struct dasd_eckd_private *private = device->private;
+	u8 esm_valid;
+	u8 esm[8];
+	int chp;
+	int rc;
+
+	rc = chsc_scud(private->uid.ssid, (u64 *)esm, &esm_valid);
+	if (rc) {
+		for (chp = 0; chp < 8; chp++)
+			device->path[chp].fc_security = 0;
+		return;
+	}
+
+	for (chp = 0; chp < 8; chp++) {
+		if (esm_valid & (0x80 >> chp))
+			device->path[chp].fc_security = esm[chp];
+		else
+			device->path[chp].fc_security = 0;
 	}
 }
 
@@ -1164,6 +1188,8 @@ static int dasd_eckd_read_conf(struct dasd_device *device)
 		}
 	}
 
+	dasd_eckd_read_fc_security(device);
+
 	return path_err;
 }
 
@@ -1430,6 +1456,8 @@ static void do_path_verification_work(struct work_struct *work)
 		dasd_path_add_cablepm(device, cablepm);
 		dasd_path_add_nohpfpm(device, hpfpm);
 		spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
+
+		dasd_path_create_kobj(device, pos);
 	}
 	clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
 	dasd_put_device(device);
@@ -2069,6 +2097,8 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
 	if (rc)
 		goto out_err3;
 
+	dasd_path_create_kobjects(device);
+
 	/* Read Feature Codes */
 	dasd_eckd_read_features(device);
 
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index 97ee0997a33e..e6823464acca 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -426,6 +426,35 @@ extern struct dasd_discipline *dasd_diag_discipline_pointer;
 #define DASD_THRHLD_MAX		4294967295U
 #define DASD_INTERVAL_MAX	4294967295U
 
+/* FC Endpoint Security Capabilities */
+#define DASD_FC_SECURITY_UNSUP		0
+#define DASD_FC_SECURITY_AUTH		1
+#define DASD_FC_SECURITY_ENC_FCSP2	2
+#define DASD_FC_SECURITY_ENC_ERAS	3
+
+#define DASD_FC_SECURITY_ENC_STR	"Encryption"
+static const struct {
+	u8 value;
+	char *name;
+} dasd_path_fcs_mnemonics[] = {
+	{ DASD_FC_SECURITY_UNSUP,	"Unsupported" },
+	{ DASD_FC_SECURITY_AUTH,	"Authentication" },
+	{ DASD_FC_SECURITY_ENC_FCSP2,	DASD_FC_SECURITY_ENC_STR },
+	{ DASD_FC_SECURITY_ENC_ERAS,	DASD_FC_SECURITY_ENC_STR },
+};
+
+static inline char *dasd_path_get_fcs_str(int val)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dasd_path_fcs_mnemonics); i++) {
+		if (dasd_path_fcs_mnemonics[i].value == val)
+			return dasd_path_fcs_mnemonics[i].name;
+	}
+
+	return dasd_path_fcs_mnemonics[0].name;
+}
+
 struct dasd_path {
 	unsigned long flags;
 	u8 cssid;
@@ -434,8 +463,18 @@ struct dasd_path {
 	struct dasd_conf_data *conf_data;
 	atomic_t error_count;
 	unsigned long errorclk;
+	u8 fc_security;
+	struct kobject kobj;
+	bool in_sysfs;
 };
 
+#define to_dasd_path(path) container_of(path, struct dasd_path, kobj)
+
+static inline void dasd_path_release(struct kobject *kobj)
+{
+/* Memory for the dasd_path kobject is freed when dasd_free_device() is called */
+}
+
 
 struct dasd_profile_info {
 	/* legacy part of profile data, as in dasd_profile_info_t */
@@ -547,6 +586,7 @@ struct dasd_device {
 	struct dentry *hosts_dentry;
 	struct dasd_profile profile;
 	struct dasd_format_entry format_entry;
+	struct kset *paths_info;
 };
 
 struct dasd_block {
@@ -824,6 +864,9 @@ int dasd_set_feature(struct ccw_device *, int, int);
 
 int dasd_add_sysfs_files(struct ccw_device *);
 void dasd_remove_sysfs_files(struct ccw_device *);
+void dasd_path_create_kobj(struct dasd_device *, int);
+void dasd_path_create_kobjects(struct dasd_device *);
+void dasd_path_remove_kobj(struct dasd_device *, int);
 
 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
@@ -1114,6 +1157,31 @@ static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device)
 	return hpfpm;
 }
 
+static inline u8 dasd_path_get_fcs_path(struct dasd_device *device, int chp)
+{
+	return device->path[chp].fc_security;
+}
+
+static inline int dasd_path_get_fcs_device(struct dasd_device *device)
+{
+	u8 fc_sec = 0;
+	int chp;
+
+	for (chp = 0; chp < 8; chp++) {
+		if (device->opm & (0x80 >> chp)) {
+			fc_sec = device->path[chp].fc_security;
+			break;
+		}
+	}
+	for (; chp < 8; chp++) {
+		if (device->opm & (0x80 >> chp))
+			if (device->path[chp].fc_security != fc_sec)
+				return -EINVAL;
+	}
+
+	return fc_sec;
+}
+
 /*
  * add functions for path masks
  * the existing path mask will be extended by the given path mask