drivers/s390/scsi/zfcp_sysfs_adapter.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_DEFINE_ADAPTER_ATTR
  28  * @_name:   name of show attribute
  29  * @_format: format string
  30  * @_value:  value to print
  31  *
  32  * Generates attributes for an adapter.
  33  */
  34 #define ZFCP_DEFINE_ADAPTER_ATTR(_name, _format, _value)                      \
  35 static ssize_t zfcp_sysfs_adapter_##_name##_show(struct device *dev, struct device_attribute *attr,          \
  36                                                  char *buf)                   \
  37 {                                                                             \
  38         struct zfcp_adapter *adapter;                                         \
  39                                                                               \
  40         adapter = dev_get_drvdata(dev);                                       \
  41         return sprintf(buf, _format, _value);                                 \
  42 }                                                                             \
  43                                                                               \
  44 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_adapter_##_name##_show, NULL);
  45
  46 ZFCP_DEFINE_ADAPTER_ATTR(status, "0x%08x\n", atomic_read(&adapter->status));
  47 ZFCP_DEFINE_ADAPTER_ATTR(peer_wwnn, "0x%016llx\n", adapter->peer_wwnn);
  48 ZFCP_DEFINE_ADAPTER_ATTR(peer_wwpn, "0x%016llx\n", adapter->peer_wwpn);
  49 ZFCP_DEFINE_ADAPTER_ATTR(peer_d_id, "0x%06x\n", adapter->peer_d_id);
  50 ZFCP_DEFINE_ADAPTER_ATTR(card_version, "0x%04x\n", adapter->hydra_version);
  51 ZFCP_DEFINE_ADAPTER_ATTR(lic_version, "0x%08x\n", adapter->fsf_lic_version);
  52 ZFCP_DEFINE_ADAPTER_ATTR(hardware_version, "0x%08x\n",
  53                          adapter->hardware_version);
  54 ZFCP_DEFINE_ADAPTER_ATTR(in_recovery, "%d\n", atomic_test_mask
  55                          (ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status));
  56
  57 /**
  58  * zfcp_sysfs_port_add_store - add a port to sysfs tree
  59  * @dev: pointer to belonging device
  60  * @buf: pointer to input buffer
  61  * @count: number of bytes in buffer
  62  *
  63  * Store function of the "port_add" attribute of an adapter.
  64  */
  65 static ssize_t
  66 zfcp_sysfs_port_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  67 {
  68         wwn_t wwpn;
  69         char *endp;
  70         struct zfcp_adapter *adapter;
  71         struct zfcp_port *port;
  72         int retval = -EINVAL;
  73
  74         down(&zfcp_data.config_sema);
  75
  76         adapter = dev_get_drvdata(dev);
  77         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
  78                 retval = -EBUSY;
  79                 goto out;
  80         }
  81
  82         wwpn = simple_strtoull(buf, &endp, 0);
  83         if ((endp + 1) < (buf + count))
  84                 goto out;
  85
  86         port = zfcp_port_enqueue(adapter, wwpn, 0, 0);
  87         if (!port)
  88                 goto out;
  89
  90         retval = 0;
  91
  92         zfcp_erp_port_reopen(port, 0);
  93         zfcp_erp_wait(port->adapter);
  94         zfcp_port_put(port);
  95  out:
  96         up(&zfcp_data.config_sema);
  97         return retval ? retval : (ssize_t) count;
  98 }
  99
 100 static DEVICE_ATTR(port_add, S_IWUSR, NULL, zfcp_sysfs_port_add_store);
 101
 102 /**
 103  * zfcp_sysfs_port_remove_store - remove a port from sysfs tree
 104  * @dev: pointer to belonging device
 105  * @buf: pointer to input buffer
 106  * @count: number of bytes in buffer
 107  *
 108  * Store function of the "port_remove" attribute of an adapter.
 109  */
 110 static ssize_t
 111 zfcp_sysfs_port_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 112 {
 113         struct zfcp_adapter *adapter;
 114         struct zfcp_port *port;
 115         wwn_t wwpn;
 116         char *endp;
 117         int retval = 0;
 118
 119         down(&zfcp_data.config_sema);
 120
 121         adapter = dev_get_drvdata(dev);
 122         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
 123                 retval = -EBUSY;
 124                 goto out;
 125         }
 126
 127         wwpn = simple_strtoull(buf, &endp, 0);
 128         if ((endp + 1) < (buf + count)) {
 129                 retval = -EINVAL;
 130                 goto out;
 131         }
 132
 133         write_lock_irq(&zfcp_data.config_lock);
 134         port = zfcp_get_port_by_wwpn(adapter, wwpn);
 135         if (port && (atomic_read(&port->refcount) == 0)) {
 136                 zfcp_port_get(port);
 137                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 138                 list_move(&port->list, &adapter->port_remove_lh);
 139         }
 140         else {
 141                 port = NULL;
 142         }
 143         write_unlock_irq(&zfcp_data.config_lock);
 144
 145         if (!port) {
 146                 retval = -ENXIO;
 147                 goto out;
 148         }
 149
 150         zfcp_erp_port_shutdown(port, 0);
 151         zfcp_erp_wait(adapter);
 152         zfcp_port_put(port);
 153         zfcp_port_dequeue(port);
 154  out:
 155         up(&zfcp_data.config_sema);
 156         return retval ? retval : (ssize_t) count;
 157 }
 158
 159 static DEVICE_ATTR(port_remove, S_IWUSR, NULL, zfcp_sysfs_port_remove_store);
 160
 161 /**
 162  * zfcp_sysfs_adapter_failed_store - failed state of adapter
 163  * @dev: pointer to belonging device
 164  * @buf: pointer to input buffer
 165  * @count: number of bytes in buffer
 166  *
 167  * Store function of the "failed" attribute of an adapter.
 168  * If a "0" gets written to "failed", error recovery will be
 169  * started for the belonging adapter.
 170  */
 171 static ssize_t
 172 zfcp_sysfs_adapter_failed_store(struct device *dev, struct device_attribute *attr,
 173                                 const char *buf, size_t count)
 174 {
 175         struct zfcp_adapter *adapter;
 176         unsigned int val;
 177         char *endp;
 178         int retval = 0;
 179
 180         down(&zfcp_data.config_sema);
 181
 182         adapter = dev_get_drvdata(dev);
 183         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
 184                 retval = -EBUSY;
 185                 goto out;
 186         }
 187
 188         val = simple_strtoul(buf, &endp, 0);
 189         if (((endp + 1) < (buf + count)) || (val != 0)) {
 190                 retval = -EINVAL;
 191                 goto out;
 192         }
 193
 194         zfcp_erp_modify_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING,
 195                                        ZFCP_SET);
 196         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
 197         zfcp_erp_wait(adapter);
 198  out:
 199         up(&zfcp_data.config_sema);
 200         return retval ? retval : (ssize_t) count;
 201 }
 202
 203 /**
 204  * zfcp_sysfs_adapter_failed_show - failed state of adapter
 205  * @dev: pointer to belonging device
 206  * @buf: pointer to input buffer
 207  *
 208  * Show function of "failed" attribute of adapter. Will be
 209  * "0" if adapter is working, otherwise "1".
 210  */
 211 static ssize_t
 212 zfcp_sysfs_adapter_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
 213 {
 214         struct zfcp_adapter *adapter;
 215
 216         adapter = dev_get_drvdata(dev);
 217         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status))
 218                 return sprintf(buf, "1\n");
 219         else
 220                 return sprintf(buf, "0\n");
 221 }
 222
 223 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_adapter_failed_show,
 224                    zfcp_sysfs_adapter_failed_store);
 225
 226 static struct attribute *zfcp_adapter_attrs[] = {
 227         &dev_attr_failed.attr,
 228         &dev_attr_in_recovery.attr,
 229         &dev_attr_port_remove.attr,
 230         &dev_attr_port_add.attr,
 231         &dev_attr_peer_wwnn.attr,
 232         &dev_attr_peer_wwpn.attr,
 233         &dev_attr_peer_d_id.attr,
 234         &dev_attr_card_version.attr,
 235         &dev_attr_lic_version.attr,
 236         &dev_attr_status.attr,
 237         &dev_attr_hardware_version.attr,
 238         NULL
 239 };
 240
 241 static struct attribute_group zfcp_adapter_attr_group = {
 242         .attrs = zfcp_adapter_attrs,
 243 };
 244
 245 /**
 246  * zfcp_sysfs_create_adapter_files - create sysfs adapter files
 247  * @dev: pointer to belonging device
 248  *
 249  * Create all attributes of the sysfs representation of an adapter.
 250  */
 251 int
 252 zfcp_sysfs_adapter_create_files(struct device *dev)
 253 {
 254         return sysfs_create_group(&dev->kobj, &zfcp_adapter_attr_group);
 255 }
 256
 257 /**
 258  * zfcp_sysfs_remove_adapter_files - remove sysfs adapter files
 259  * @dev: pointer to belonging device
 260  *
 261  * Remove all attributes of the sysfs representation of an adapter.
 262  */
 263 void
 264 zfcp_sysfs_adapter_remove_files(struct device *dev)
 265 {
 266         sysfs_remove_group(&dev->kobj, &zfcp_adapter_attr_group);
 267 }
 268
 269 #undef ZFCP_LOG_AREA