diff options
Diffstat (limited to 'drivers/s390/scsi/zfcp_sysfs_unit.c')
| -rw-r--r-- | drivers/s390/scsi/zfcp_sysfs_unit.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_sysfs_unit.c b/drivers/s390/scsi/zfcp_sysfs_unit.c new file mode 100644 index 000000000000..87c0b461831f --- /dev/null +++ b/drivers/s390/scsi/zfcp_sysfs_unit.c @@ -0,0 +1,179 @@ +/* + * linux/drivers/s390/scsi/zfcp_sysfs_unit.c + * + * FCP adapter driver for IBM eServer zSeries + * + * sysfs unit 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_UNIT_C_REVISION "$Revision: 1.30 $" + +#include "zfcp_ext.h" + +#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG + +/** + * zfcp_sysfs_unit_release - gets called when a struct device unit is released + * @dev: pointer to belonging device + */ +void +zfcp_sysfs_unit_release(struct device *dev) +{ + kfree(dev); +} + +/** + * ZFCP_DEFINE_UNIT_ATTR + * @_name: name of show attribute + * @_format: format string + * @_value: value to print + * + * Generates attribute for a unit. + */ +#define ZFCP_DEFINE_UNIT_ATTR(_name, _format, _value) \ +static ssize_t zfcp_sysfs_unit_##_name##_show(struct device *dev, \ + char *buf) \ +{ \ + struct zfcp_unit *unit; \ + \ + unit = dev_get_drvdata(dev); \ + return sprintf(buf, _format, _value); \ +} \ + \ +static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_unit_##_name##_show, NULL); + +ZFCP_DEFINE_UNIT_ATTR(status, "0x%08x\n", atomic_read(&unit->status)); +ZFCP_DEFINE_UNIT_ATTR(scsi_lun, "0x%x\n", unit->scsi_lun); +ZFCP_DEFINE_UNIT_ATTR(in_recovery, "%d\n", atomic_test_mask + (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status)); +ZFCP_DEFINE_UNIT_ATTR(access_denied, "%d\n", atomic_test_mask + (ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status)); +ZFCP_DEFINE_UNIT_ATTR(access_shared, "%d\n", atomic_test_mask + (ZFCP_STATUS_UNIT_SHARED, &unit->status)); +ZFCP_DEFINE_UNIT_ATTR(access_readonly, "%d\n", atomic_test_mask + (ZFCP_STATUS_UNIT_READONLY, &unit->status)); + +/** + * zfcp_sysfs_unit_failed_store - failed state of unit + * @dev: pointer to belonging device + * @buf: pointer to input buffer + * @count: number of bytes in buffer + * + * Store function of the "failed" attribute of a unit. + * If a "0" gets written to "failed", error recovery will be + * started for the belonging unit. + */ +static ssize_t +zfcp_sysfs_unit_failed_store(struct device *dev, const char *buf, size_t count) +{ + struct zfcp_unit *unit; + unsigned int val; + char *endp; + int retval = 0; + + down(&zfcp_data.config_sema); + unit = dev_get_drvdata(dev); + if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->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_unit_status(unit, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET); + zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED); + zfcp_erp_wait(unit->port->adapter); + out: + up(&zfcp_data.config_sema); + return retval ? retval : (ssize_t) count; +} + +/** + * zfcp_sysfs_unit_failed_show - failed state of unit + * @dev: pointer to belonging device + * @buf: pointer to input buffer + * + * Show function of "failed" attribute of unit. Will be + * "0" if unit is working, otherwise "1". + */ +static ssize_t +zfcp_sysfs_unit_failed_show(struct device *dev, char *buf) +{ + struct zfcp_unit *unit; + + unit = dev_get_drvdata(dev); + if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status)) + return sprintf(buf, "1\n"); + else + return sprintf(buf, "0\n"); +} + +static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_unit_failed_show, + zfcp_sysfs_unit_failed_store); + +static struct attribute *zfcp_unit_attrs[] = { + &dev_attr_scsi_lun.attr, + &dev_attr_failed.attr, + &dev_attr_in_recovery.attr, + &dev_attr_status.attr, + &dev_attr_access_denied.attr, + &dev_attr_access_shared.attr, + &dev_attr_access_readonly.attr, + NULL +}; + +static struct attribute_group zfcp_unit_attr_group = { + .attrs = zfcp_unit_attrs, +}; + +/** + * zfcp_sysfs_create_unit_files - create sysfs unit files + * @dev: pointer to belonging device + * + * Create all attributes of the sysfs representation of a unit. + */ +int +zfcp_sysfs_unit_create_files(struct device *dev) +{ + return sysfs_create_group(&dev->kobj, &zfcp_unit_attr_group); +} + +/** + * zfcp_sysfs_remove_unit_files - remove sysfs unit files + * @dev: pointer to belonging device + * + * Remove all attributes of the sysfs representation of a unit. + */ +void +zfcp_sysfs_unit_remove_files(struct device *dev) +{ + sysfs_remove_group(&dev->kobj, &zfcp_unit_attr_group); +} + +#undef ZFCP_LOG_AREA |