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path: root/drivers/s390/scsi/zfcp_sysfs_port.c
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Diffstat (limited to 'drivers/s390/scsi/zfcp_sysfs_port.c')
-rw-r--r--drivers/s390/scsi/zfcp_sysfs_port.c311
1 files changed, 311 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_sysfs_port.c b/drivers/s390/scsi/zfcp_sysfs_port.c
new file mode 100644
index 00000000000..6aafb2abb4b
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_sysfs_port.c
@@ -0,0 +1,311 @@
+/*
+ * linux/drivers/s390/scsi/zfcp_sysfs_port.c
+ *
+ * FCP adapter driver for IBM eServer zSeries
+ *
+ * sysfs port related routines
+ *
+ * (C) Copyright IBM Corp. 2003, 2004
+ *
+ * Authors:
+ * Martin Peschke <mpeschke@de.ibm.com>
+ * Heiko Carstens <heiko.carstens@de.ibm.com>
+ * Andreas Herrmann <aherrman@de.ibm.com>
+ * Volker Sameske <sameske@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define ZFCP_SYSFS_PORT_C_REVISION "$Revision: 1.47 $"
+
+#include "zfcp_ext.h"
+
+#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
+
+/**
+ * zfcp_sysfs_port_release - gets called when a struct device port is released
+ * @dev: pointer to belonging device
+ */
+void
+zfcp_sysfs_port_release(struct device *dev)
+{
+ kfree(dev);
+}
+
+/**
+ * ZFCP_DEFINE_PORT_ATTR
+ * @_name: name of show attribute
+ * @_format: format string
+ * @_value: value to print
+ *
+ * Generates attributes for a port.
+ */
+#define ZFCP_DEFINE_PORT_ATTR(_name, _format, _value) \
+static ssize_t zfcp_sysfs_port_##_name##_show(struct device *dev, \
+ char *buf) \
+{ \
+ struct zfcp_port *port; \
+ \
+ port = dev_get_drvdata(dev); \
+ return sprintf(buf, _format, _value); \
+} \
+ \
+static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_port_##_name##_show, NULL);
+
+ZFCP_DEFINE_PORT_ATTR(status, "0x%08x\n", atomic_read(&port->status));
+ZFCP_DEFINE_PORT_ATTR(wwnn, "0x%016llx\n", port->wwnn);
+ZFCP_DEFINE_PORT_ATTR(d_id, "0x%06x\n", port->d_id);
+ZFCP_DEFINE_PORT_ATTR(scsi_id, "0x%x\n", port->scsi_id);
+ZFCP_DEFINE_PORT_ATTR(in_recovery, "%d\n", atomic_test_mask
+ (ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
+ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
+ (ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
+
+/**
+ * zfcp_sysfs_unit_add_store - add a unit to sysfs tree
+ * @dev: pointer to belonging device
+ * @buf: pointer to input buffer
+ * @count: number of bytes in buffer
+ *
+ * Store function of the "unit_add" attribute of a port.
+ */
+static ssize_t
+zfcp_sysfs_unit_add_store(struct device *dev, const char *buf, size_t count)
+{
+ fcp_lun_t fcp_lun;
+ char *endp;
+ struct zfcp_port *port;
+ struct zfcp_unit *unit;
+ int retval = -EINVAL;
+
+ down(&zfcp_data.config_sema);
+
+ port = dev_get_drvdata(dev);
+ if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
+ retval = -EBUSY;
+ goto out;
+ }
+
+ fcp_lun = simple_strtoull(buf, &endp, 0);
+ if ((endp + 1) < (buf + count))
+ goto out;
+
+ unit = zfcp_unit_enqueue(port, fcp_lun);
+ if (!unit)
+ goto out;
+
+ retval = 0;
+
+ zfcp_erp_unit_reopen(unit, 0);
+ zfcp_erp_wait(unit->port->adapter);
+ zfcp_unit_put(unit);
+ out:
+ up(&zfcp_data.config_sema);
+ return retval ? retval : (ssize_t) count;
+}
+
+static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
+
+/**
+ * zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
+ * @dev: pointer to belonging device
+ * @buf: pointer to input buffer
+ * @count: number of bytes in buffer
+ */
+static ssize_t
+zfcp_sysfs_unit_remove_store(struct device *dev, const char *buf, size_t count)
+{
+ struct zfcp_port *port;
+ struct zfcp_unit *unit;
+ fcp_lun_t fcp_lun;
+ char *endp;
+ int retval = 0;
+
+ down(&zfcp_data.config_sema);
+
+ port = dev_get_drvdata(dev);
+ if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
+ retval = -EBUSY;
+ goto out;
+ }
+
+ fcp_lun = simple_strtoull(buf, &endp, 0);
+ if ((endp + 1) < (buf + count)) {
+ retval = -EINVAL;
+ goto out;
+ }
+
+ write_lock_irq(&zfcp_data.config_lock);
+ unit = zfcp_get_unit_by_lun(port, fcp_lun);
+ if (unit && (atomic_read(&unit->refcount) == 0)) {
+ zfcp_unit_get(unit);
+ atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
+ list_move(&unit->list, &port->unit_remove_lh);
+ }
+ else {
+ unit = NULL;
+ }
+ write_unlock_irq(&zfcp_data.config_lock);
+
+ if (!unit) {
+ retval = -ENXIO;
+ goto out;
+ }
+
+ zfcp_erp_unit_shutdown(unit, 0);
+ zfcp_erp_wait(unit->port->adapter);
+ zfcp_unit_put(unit);
+ zfcp_unit_dequeue(unit);
+ out:
+ up(&zfcp_data.config_sema);
+ return retval ? retval : (ssize_t) count;
+}
+
+static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
+
+/**
+ * zfcp_sysfs_port_failed_store - failed state of port
+ * @dev: pointer to belonging device
+ * @buf: pointer to input buffer
+ * @count: number of bytes in buffer
+ *
+ * Store function of the "failed" attribute of a port.
+ * If a "0" gets written to "failed", error recovery will be
+ * started for the belonging port.
+ */
+static ssize_t
+zfcp_sysfs_port_failed_store(struct device *dev, const char *buf, size_t count)
+{
+ struct zfcp_port *port;
+ unsigned int val;
+ char *endp;
+ int retval = 0;
+
+ down(&zfcp_data.config_sema);
+
+ port = dev_get_drvdata(dev);
+ if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
+ retval = -EBUSY;
+ goto out;
+ }
+
+ val = simple_strtoul(buf, &endp, 0);
+ if (((endp + 1) < (buf + count)) || (val != 0)) {
+ retval = -EINVAL;
+ goto out;
+ }
+
+ zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
+ zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
+ zfcp_erp_wait(port->adapter);
+ out:
+ up(&zfcp_data.config_sema);
+ return retval ? retval : (ssize_t) count;
+}
+
+/**
+ * zfcp_sysfs_port_failed_show - failed state of port
+ * @dev: pointer to belonging device
+ * @buf: pointer to input buffer
+ *
+ * Show function of "failed" attribute of port. Will be
+ * "0" if port is working, otherwise "1".
+ */
+static ssize_t
+zfcp_sysfs_port_failed_show(struct device *dev, char *buf)
+{
+ struct zfcp_port *port;
+
+ port = dev_get_drvdata(dev);
+ if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status))
+ return sprintf(buf, "1\n");
+ else
+ return sprintf(buf, "0\n");
+}
+
+static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_port_failed_show,
+ zfcp_sysfs_port_failed_store);
+
+/**
+ * zfcp_port_common_attrs
+ * sysfs attributes that are common for all kind of fc ports.
+ */
+static struct attribute *zfcp_port_common_attrs[] = {
+ &dev_attr_failed.attr,
+ &dev_attr_in_recovery.attr,
+ &dev_attr_status.attr,
+ &dev_attr_wwnn.attr,
+ &dev_attr_d_id.attr,
+ &dev_attr_access_denied.attr,
+ NULL
+};
+
+static struct attribute_group zfcp_port_common_attr_group = {
+ .attrs = zfcp_port_common_attrs,
+};
+
+/**
+ * zfcp_port_no_ns_attrs
+ * sysfs attributes not to be used for nameserver ports.
+ */
+static struct attribute *zfcp_port_no_ns_attrs[] = {
+ &dev_attr_unit_add.attr,
+ &dev_attr_unit_remove.attr,
+ &dev_attr_scsi_id.attr,
+ NULL
+};
+
+static struct attribute_group zfcp_port_no_ns_attr_group = {
+ .attrs = zfcp_port_no_ns_attrs,
+};
+
+/**
+ * zfcp_sysfs_port_create_files - create sysfs port files
+ * @dev: pointer to belonging device
+ *
+ * Create all attributes of the sysfs representation of a port.
+ */
+int
+zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
+{
+ int retval;
+
+ retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
+
+ if ((flags & ZFCP_STATUS_PORT_WKA) || retval)
+ return retval;
+
+ retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
+ if (retval)
+ sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
+
+ return retval;
+}
+
+/**
+ * zfcp_sysfs_port_remove_files - remove sysfs port files
+ * @dev: pointer to belonging device
+ *
+ * Remove all attributes of the sysfs representation of a port.
+ */
+void
+zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
+{
+ sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
+ if (!(flags & ZFCP_STATUS_PORT_WKA))
+ sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
+}
+
+#undef ZFCP_LOG_AREA
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-20 08:46:21 +0000