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  *      Andreas Herrmann <aherrman@de.ibm.com>
  14  *      Volker Sameske <sameske@de.ibm.com>
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2, or (at your option)
  19  * any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  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, struct device_attribute *attr,        \
  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(in_recovery, "%d\n", atomic_test_mask
  67                       (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status));
  68 ZFCP_DEFINE_UNIT_ATTR(access_denied, "%d\n", atomic_test_mask
  69                       (ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status));
  70 ZFCP_DEFINE_UNIT_ATTR(access_shared, "%d\n", atomic_test_mask
  71                       (ZFCP_STATUS_UNIT_SHARED, &unit->status));
  72 ZFCP_DEFINE_UNIT_ATTR(access_readonly, "%d\n", atomic_test_mask
  73                       (ZFCP_STATUS_UNIT_READONLY, &unit->status));
  74
  75 /**
  76  * zfcp_sysfs_unit_failed_store - failed state of unit
  77  * @dev: pointer to belonging device
  78  * @buf: pointer to input buffer
  79  * @count: number of bytes in buffer
  80  *
  81  * Store function of the "failed" attribute of a unit.
  82  * If a "0" gets written to "failed", error recovery will be
  83  * started for the belonging unit.
  84  */
  85 static ssize_t
  86 zfcp_sysfs_unit_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  87 {
  88         struct zfcp_unit *unit;
  89         unsigned int val;
  90         char *endp;
  91         int retval = 0;
  92
  93         down(&zfcp_data.config_sema);
  94         unit = dev_get_drvdata(dev);
  95         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status)) {
  96                 retval = -EBUSY;
  97                 goto out;
  98         }
  99
 100         val = simple_strtoul(buf, &endp, 0);
 101         if (((endp + 1) < (buf + count)) || (val != 0)) {
 102                 retval = -EINVAL;
 103                 goto out;
 104         }
 105
 106         zfcp_erp_modify_unit_status(unit, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 107         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
 108         zfcp_erp_wait(unit->port->adapter);
 109  out:
 110         up(&zfcp_data.config_sema);
 111         return retval ? retval : (ssize_t) count;
 112 }
 113
 114 /**
 115  * zfcp_sysfs_unit_failed_show - failed state of unit
 116  * @dev: pointer to belonging device
 117  * @buf: pointer to input buffer
 118  *
 119  * Show function of "failed" attribute of unit. Will be
 120  * "0" if unit is working, otherwise "1".
 121  */
 122 static ssize_t
 123 zfcp_sysfs_unit_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
 124 {
 125         struct zfcp_unit *unit;
 126
 127         unit = dev_get_drvdata(dev);
 128         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status))
 129                 return sprintf(buf, "1\n");
 130         else
 131                 return sprintf(buf, "0\n");
 132 }
 133
 134 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_unit_failed_show,
 135                    zfcp_sysfs_unit_failed_store);
 136
 137 static struct attribute *zfcp_unit_attrs[] = {
 138         &dev_attr_failed.attr,
 139         &dev_attr_in_recovery.attr,
 140         &dev_attr_status.attr,
 141         &dev_attr_access_denied.attr,
 142         &dev_attr_access_shared.attr,
 143         &dev_attr_access_readonly.attr,
 144         NULL
 145 };
 146
 147 static struct attribute_group zfcp_unit_attr_group = {
 148         .attrs = zfcp_unit_attrs,
 149 };
 150
 151 /**
 152  * zfcp_sysfs_create_unit_files - create sysfs unit files
 153  * @dev: pointer to belonging device
 154  *
 155  * Create all attributes of the sysfs representation of a unit.
 156  */
 157 int
 158 zfcp_sysfs_unit_create_files(struct device *dev)
 159 {
 160         return sysfs_create_group(&dev->kobj, &zfcp_unit_attr_group);
 161 }
 162
 163 /**
 164  * zfcp_sysfs_remove_unit_files - remove sysfs unit files
 165  * @dev: pointer to belonging device
 166  *
 167  * Remove all attributes of the sysfs representation of a unit.
 168  */
 169 void
 170 zfcp_sysfs_unit_remove_files(struct device *dev)
 171 {
 172         sysfs_remove_group(&dev->kobj, &zfcp_unit_attr_group);
 173 }
 174
 175 #undef ZFCP_LOG_AREA