drivers/s390/scsi/zfcp_sysfs_unit.c

   1 /*
   2  * linux/drivers/s390/scsi/zfcp_sysfs_unit.c
   3  *
   4  * FCP adapter driver for IBM eServer zSeries
   5  *
   6  * sysfs unit related routines
   7  *
   8  * (C) Copyright IBM Corp. 2003, 2004
   9  *
  10  * Authors:
  11  *      Martin Peschke <mpeschke@de.ibm.com>
  12  *      Heiko Carstens <heiko.carstens@de.ibm.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2, or (at your option)
  17  * any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 #define ZFCP_SYSFS_UNIT_C_REVISION "$Revision: 1.27 $"
  30
  31 #include "zfcp_ext.h"
  32
  33 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  34
  35 /**
  36  * zfcp_sysfs_unit_release - gets called when a struct device unit is released
  37  * @dev: pointer to belonging device
  38  */
  39 void
  40 zfcp_sysfs_unit_release(struct device *dev)
  41 {
  42         kfree(dev);
  43 }
  44
  45 /**
  46  * ZFCP_DEFINE_UNIT_ATTR
  47  * @_name:   name of show attribute
  48  * @_format: format string
  49  * @_value:  value to print
  50  *
  51  * Generates attribute for a unit.
  52  */
  53 #define ZFCP_DEFINE_UNIT_ATTR(_name, _format, _value)                    \
  54 static ssize_t zfcp_sysfs_unit_##_name##_show(struct device *dev,        \
  55                                               char *buf)                 \
  56 {                                                                        \
  57         struct zfcp_unit *unit;                                          \
  58                                                                          \
  59         unit = dev_get_drvdata(dev);                                     \
  60         return sprintf(buf, _format, _value);                            \
  61 }                                                                        \
  62                                                                          \
  63 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_unit_##_name##_show, NULL);
  64
  65 ZFCP_DEFINE_UNIT_ATTR(status, "0x%08x\n", atomic_read(&unit->status));
  66 ZFCP_DEFINE_UNIT_ATTR(scsi_lun, "0x%x\n", unit->scsi_lun);
  67 ZFCP_DEFINE_UNIT_ATTR(in_recovery, "%d\n", atomic_test_mask
  68                       (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status));
  69
  70 /**
  71  * zfcp_sysfs_unit_failed_store - failed state of unit
  72  * @dev: pointer to belonging device
  73  * @buf: pointer to input buffer
  74  * @count: number of bytes in buffer
  75  *
  76  * Store function of the "failed" attribute of a unit.
  77  * If a "0" gets written to "failed", error recovery will be
  78  * started for the belonging unit.
  79  */
  80 static ssize_t
  81 zfcp_sysfs_unit_failed_store(struct device *dev, const char *buf, size_t count)
  82 {
  83         struct zfcp_unit *unit;
  84         unsigned int val;
  85         char *endp;
  86         int retval = 0;
  87
  88         down(&zfcp_data.config_sema);
  89         unit = dev_get_drvdata(dev);
  90         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status)) {
  91                 retval = -EBUSY;
  92                 goto out;
  93         }
  94
  95         val = simple_strtoul(buf, &endp, 0);
  96         if (((endp + 1) < (buf + count)) || (val != 0)) {
  97                 retval = -EINVAL;
  98                 goto out;
  99         }
 100
 101         zfcp_erp_modify_unit_status(unit, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 102         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
 103         zfcp_erp_wait(unit->port->adapter);
 104  out:
 105         up(&zfcp_data.config_sema);
 106         return retval ? retval : (ssize_t) count;
 107 }
 108
 109 /**
 110  * zfcp_sysfs_unit_failed_show - failed state of unit
 111  * @dev: pointer to belonging device
 112  * @buf: pointer to input buffer
 113  *
 114  * Show function of "failed" attribute of unit. Will be
 115  * "0" if unit is working, otherwise "1".
 116  */
 117 static ssize_t
 118 zfcp_sysfs_unit_failed_show(struct device *dev, char *buf)
 119 {
 120         struct zfcp_unit *unit;
 121
 122         unit = dev_get_drvdata(dev);
 123         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status))
 124                 return sprintf(buf, "1\n");
 125         else
 126                 return sprintf(buf, "0\n");
 127 }
 128
 129 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_unit_failed_show,
 130                    zfcp_sysfs_unit_failed_store);
 131
 132 static struct attribute *zfcp_unit_attrs[] = {
 133         &dev_attr_scsi_lun.attr,
 134         &dev_attr_failed.attr,
 135         &dev_attr_in_recovery.attr,
 136         &dev_attr_status.attr,
 137         NULL
 138 };
 139
 140 static struct attribute_group zfcp_unit_attr_group = {
 141         .attrs = zfcp_unit_attrs,
 142 };
 143
 144 /**
 145  * zfcp_sysfs_create_unit_files - create sysfs unit files
 146  * @dev: pointer to belonging device
 147  *
 148  * Create all attributes of the sysfs representation of a unit.
 149  */
 150 int
 151 zfcp_sysfs_unit_create_files(struct device *dev)
 152 {
 153         return sysfs_create_group(&dev->kobj, &zfcp_unit_attr_group);
 154 }
 155
 156 /**
 157  * zfcp_sysfs_remove_unit_files - remove sysfs unit files
 158  * @dev: pointer to belonging device
 159  *
 160  * Remove all attributes of the sysfs representation of a unit.
 161  */
 162 void
 163 zfcp_sysfs_unit_remove_files(struct device *dev)
 164 {
 165         sysfs_remove_group(&dev->kobj, &zfcp_unit_attr_group);
 166 }
 167
 168 #undef ZFCP_LOG_AREA