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 #define ZFCP_SYSFS_UNIT_C_REVISION "$Revision: 1.30 $"
  32
  33 #include "zfcp_ext.h"
  34
  35 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  36
  37 /**
  38  * zfcp_sysfs_unit_release - gets called when a struct device unit is released
  39  * @dev: pointer to belonging device
  40  */
  41 void
  42 zfcp_sysfs_unit_release(struct device *dev)
  43 {
  44         kfree(dev);
  45 }
  46
  47 /**
  48  * ZFCP_DEFINE_UNIT_ATTR
  49  * @_name:   name of show attribute
  50  * @_format: format string
  51  * @_value:  value to print
  52  *
  53  * Generates attribute for a unit.
  54  */
  55 #define ZFCP_DEFINE_UNIT_ATTR(_name, _format, _value)                    \
  56 static ssize_t zfcp_sysfs_unit_##_name##_show(struct device *dev, struct device_attribute *attr,        \
  57                                               char *buf)                 \
  58 {                                                                        \
  59         struct zfcp_unit *unit;                                          \
  60                                                                          \
  61         unit = dev_get_drvdata(dev);                                     \
  62         return sprintf(buf, _format, _value);                            \
  63 }                                                                        \
  64                                                                          \
  65 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_unit_##_name##_show, NULL);
  66
  67 ZFCP_DEFINE_UNIT_ATTR(status, "0x%08x\n", atomic_read(&unit->status));
  68 ZFCP_DEFINE_UNIT_ATTR(in_recovery, "%d\n", atomic_test_mask
  69                       (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status));
  70 ZFCP_DEFINE_UNIT_ATTR(access_denied, "%d\n", atomic_test_mask
  71                       (ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status));
  72 ZFCP_DEFINE_UNIT_ATTR(access_shared, "%d\n", atomic_test_mask
  73                       (ZFCP_STATUS_UNIT_SHARED, &unit->status));
  74 ZFCP_DEFINE_UNIT_ATTR(access_readonly, "%d\n", atomic_test_mask
  75                       (ZFCP_STATUS_UNIT_READONLY, &unit->status));
  76
  77 /**
  78  * zfcp_sysfs_unit_failed_store - failed state of unit
  79  * @dev: pointer to belonging device
  80  * @buf: pointer to input buffer
  81  * @count: number of bytes in buffer
  82  *
  83  * Store function of the "failed" attribute of a unit.
  84  * If a "0" gets written to "failed", error recovery will be
  85  * started for the belonging unit.
  86  */
  87 static ssize_t
  88 zfcp_sysfs_unit_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  89 {
  90         struct zfcp_unit *unit;
  91         unsigned int val;
  92         char *endp;
  93         int retval = 0;
  94
  95         down(&zfcp_data.config_sema);
  96         unit = dev_get_drvdata(dev);
  97         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status)) {
  98                 retval = -EBUSY;
  99                 goto out;
 100         }
 101
 102         val = simple_strtoul(buf, &endp, 0);
 103         if (((endp + 1) < (buf + count)) || (val != 0)) {
 104                 retval = -EINVAL;
 105                 goto out;
 106         }
 107
 108         zfcp_erp_modify_unit_status(unit, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 109         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
 110         zfcp_erp_wait(unit->port->adapter);
 111  out:
 112         up(&zfcp_data.config_sema);
 113         return retval ? retval : (ssize_t) count;
 114 }
 115
 116 /**
 117  * zfcp_sysfs_unit_failed_show - failed state of unit
 118  * @dev: pointer to belonging device
 119  * @buf: pointer to input buffer
 120  *
 121  * Show function of "failed" attribute of unit. Will be
 122  * "0" if unit is working, otherwise "1".
 123  */
 124 static ssize_t
 125 zfcp_sysfs_unit_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
 126 {
 127         struct zfcp_unit *unit;
 128
 129         unit = dev_get_drvdata(dev);
 130         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status))
 131                 return sprintf(buf, "1\n");
 132         else
 133                 return sprintf(buf, "0\n");
 134 }
 135
 136 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_unit_failed_show,
 137                    zfcp_sysfs_unit_failed_store);
 138
 139 static struct attribute *zfcp_unit_attrs[] = {
 140         &dev_attr_failed.attr,
 141         &dev_attr_in_recovery.attr,
 142         &dev_attr_status.attr,
 143         &dev_attr_access_denied.attr,
 144         &dev_attr_access_shared.attr,
 145         &dev_attr_access_readonly.attr,
 146         NULL
 147 };
 148
 149 static struct attribute_group zfcp_unit_attr_group = {
 150         .attrs = zfcp_unit_attrs,
 151 };
 152
 153 /**
 154  * zfcp_sysfs_create_unit_files - create sysfs unit files
 155  * @dev: pointer to belonging device
 156  *
 157  * Create all attributes of the sysfs representation of a unit.
 158  */
 159 int
 160 zfcp_sysfs_unit_create_files(struct device *dev)
 161 {
 162         return sysfs_create_group(&dev->kobj, &zfcp_unit_attr_group);
 163 }
 164
 165 /**
 166  * zfcp_sysfs_remove_unit_files - remove sysfs unit files
 167  * @dev: pointer to belonging device
 168  *
 169  * Remove all attributes of the sysfs representation of a unit.
 170  */
 171 void
 172 zfcp_sysfs_unit_remove_files(struct device *dev)
 173 {
 174         sysfs_remove_group(&dev->kobj, &zfcp_unit_attr_group);
 175 }
 176
 177 #undef ZFCP_LOG_AREA