drivers/s390/scsi/zfcp_sysfs_unit.c

   1 /*
   2  * This file is part of the zfcp device driver for
   3  * FCP adapters for IBM System z9 and zSeries.
   4  *
   5  * (C) Copyright IBM Corp. 2002, 2006
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "zfcp_ext.h"
  23
  24 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  25
  26 /**
  27  * zfcp_sysfs_unit_release - gets called when a struct device unit is released
  28  * @dev: pointer to belonging device
  29  */
  30 void
  31 zfcp_sysfs_unit_release(struct device *dev)
  32 {
  33         kfree(dev);
  34 }
  35
  36 /**
  37  * ZFCP_DEFINE_UNIT_ATTR
  38  * @_name:   name of show attribute
  39  * @_format: format string
  40  * @_value:  value to print
  41  *
  42  * Generates attribute for a unit.
  43  */
  44 #define ZFCP_DEFINE_UNIT_ATTR(_name, _format, _value)                    \
  45 static ssize_t zfcp_sysfs_unit_##_name##_show(struct device *dev, struct device_attribute *attr,        \
  46                                               char *buf)                 \
  47 {                                                                        \
  48         struct zfcp_unit *unit;                                          \
  49                                                                          \
  50         unit = dev_get_drvdata(dev);                                     \
  51         return sprintf(buf, _format, _value);                            \
  52 }                                                                        \
  53                                                                          \
  54 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_unit_##_name##_show, NULL);
  55
  56 ZFCP_DEFINE_UNIT_ATTR(status, "0x%08x\n", atomic_read(&unit->status));
  57 ZFCP_DEFINE_UNIT_ATTR(in_recovery, "%d\n", atomic_test_mask
  58                       (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status));
  59 ZFCP_DEFINE_UNIT_ATTR(access_denied, "%d\n", atomic_test_mask
  60                       (ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status));
  61 ZFCP_DEFINE_UNIT_ATTR(access_shared, "%d\n", atomic_test_mask
  62                       (ZFCP_STATUS_UNIT_SHARED, &unit->status));
  63 ZFCP_DEFINE_UNIT_ATTR(access_readonly, "%d\n", atomic_test_mask
  64                       (ZFCP_STATUS_UNIT_READONLY, &unit->status));
  65
  66 /**
  67  * zfcp_sysfs_unit_failed_store - failed state of unit
  68  * @dev: pointer to belonging device
  69  * @buf: pointer to input buffer
  70  * @count: number of bytes in buffer
  71  *
  72  * Store function of the "failed" attribute of a unit.
  73  * If a "0" gets written to "failed", error recovery will be
  74  * started for the belonging unit.
  75  */
  76 static ssize_t
  77 zfcp_sysfs_unit_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  78 {
  79         struct zfcp_unit *unit;
  80         unsigned int val;
  81         char *endp;
  82         int retval = 0;
  83
  84         down(&zfcp_data.config_sema);
  85         unit = dev_get_drvdata(dev);
  86         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status)) {
  87                 retval = -EBUSY;
  88                 goto out;
  89         }
  90
  91         val = simple_strtoul(buf, &endp, 0);
  92         if (((endp + 1) < (buf + count)) || (val != 0)) {
  93                 retval = -EINVAL;
  94                 goto out;
  95         }
  96
  97         zfcp_erp_modify_unit_status(unit, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
  98         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
  99         zfcp_erp_wait(unit->port->adapter);
 100  out:
 101         up(&zfcp_data.config_sema);
 102         return retval ? retval : (ssize_t) count;
 103 }
 104
 105 /**
 106  * zfcp_sysfs_unit_failed_show - failed state of unit
 107  * @dev: pointer to belonging device
 108  * @buf: pointer to input buffer
 109  *
 110  * Show function of "failed" attribute of unit. Will be
 111  * "0" if unit is working, otherwise "1".
 112  */
 113 static ssize_t
 114 zfcp_sysfs_unit_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
 115 {
 116         struct zfcp_unit *unit;
 117
 118         unit = dev_get_drvdata(dev);
 119         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status))
 120                 return sprintf(buf, "1\n");
 121         else
 122                 return sprintf(buf, "0\n");
 123 }
 124
 125 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_unit_failed_show,
 126                    zfcp_sysfs_unit_failed_store);
 127
 128 static struct attribute *zfcp_unit_attrs[] = {
 129         &dev_attr_failed.attr,
 130         &dev_attr_in_recovery.attr,
 131         &dev_attr_status.attr,
 132         &dev_attr_access_denied.attr,
 133         &dev_attr_access_shared.attr,
 134         &dev_attr_access_readonly.attr,
 135         NULL
 136 };
 137
 138 static struct attribute_group zfcp_unit_attr_group = {
 139         .attrs = zfcp_unit_attrs,
 140 };
 141
 142 /**
 143  * zfcp_sysfs_create_unit_files - create sysfs unit files
 144  * @dev: pointer to belonging device
 145  *
 146  * Create all attributes of the sysfs representation of a unit.
 147  */
 148 int
 149 zfcp_sysfs_unit_create_files(struct device *dev)
 150 {
 151         return sysfs_create_group(&dev->kobj, &zfcp_unit_attr_group);
 152 }
 153
 154 /**
 155  * zfcp_sysfs_remove_unit_files - remove sysfs unit files
 156  * @dev: pointer to belonging device
 157  *
 158  * Remove all attributes of the sysfs representation of a unit.
 159  */
 160 void
 161 zfcp_sysfs_unit_remove_files(struct device *dev)
 162 {
 163         sysfs_remove_group(&dev->kobj, &zfcp_unit_attr_group);
 164 }
 165
 166 #undef ZFCP_LOG_AREA