drivers/s390/scsi/zfcp_sysfs_adapter.c

   1 /*
   2  * linux/drivers/s390/scsi/zfcp_sysfs_adapter.c
   3  *
   4  * FCP adapter driver for IBM eServer zSeries
   5  *
   6  * sysfs adapter 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_ADAPTER_C_REVISION "$Revision: 1.37 $"
  30
  31 #include "zfcp_ext.h"
  32
  33 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  34
  35 static const char fc_topologies[5][25] = {
  36         "<error>",
  37         "point-to-point",
  38         "fabric",
  39         "arbitrated loop",
  40         "fabric (virt. adapter)"
  41 };
  42
  43 /**
  44  * ZFCP_DEFINE_ADAPTER_ATTR
  45  * @_name:   name of show attribute
  46  * @_format: format string
  47  * @_value:  value to print
  48  *
  49  * Generates attributes for an adapter.
  50  */
  51 #define ZFCP_DEFINE_ADAPTER_ATTR(_name, _format, _value)                      \
  52 static ssize_t zfcp_sysfs_adapter_##_name##_show(struct device *dev,          \
  53                                                  char *buf)                   \
  54 {                                                                             \
  55         struct zfcp_adapter *adapter;                                         \
  56                                                                               \
  57         adapter = dev_get_drvdata(dev);                                       \
  58         return sprintf(buf, _format, _value);                                 \
  59 }                                                                             \
  60                                                                               \
  61 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_adapter_##_name##_show, NULL);
  62
  63 ZFCP_DEFINE_ADAPTER_ATTR(status, "0x%08x\n", atomic_read(&adapter->status));
  64 ZFCP_DEFINE_ADAPTER_ATTR(wwnn, "0x%016llx\n", adapter->wwnn);
  65 ZFCP_DEFINE_ADAPTER_ATTR(wwpn, "0x%016llx\n", adapter->wwpn);
  66 ZFCP_DEFINE_ADAPTER_ATTR(s_id, "0x%06x\n", adapter->s_id);
  67 ZFCP_DEFINE_ADAPTER_ATTR(card_version, "0x%04x\n", adapter->hydra_version);
  68 ZFCP_DEFINE_ADAPTER_ATTR(lic_version, "0x%08x\n", adapter->fsf_lic_version);
  69 ZFCP_DEFINE_ADAPTER_ATTR(fc_link_speed, "%d Gb/s\n", adapter->fc_link_speed);
  70 ZFCP_DEFINE_ADAPTER_ATTR(fc_service_class, "%d\n", adapter->fc_service_class);
  71 ZFCP_DEFINE_ADAPTER_ATTR(fc_topology, "%s\n",
  72                          fc_topologies[adapter->fc_topology]);
  73 ZFCP_DEFINE_ADAPTER_ATTR(hardware_version, "0x%08x\n",
  74                          adapter->hardware_version);
  75 ZFCP_DEFINE_ADAPTER_ATTR(serial_number, "%17s\n", adapter->serial_number);
  76 ZFCP_DEFINE_ADAPTER_ATTR(scsi_host_no, "0x%x\n", adapter->scsi_host_no);
  77 ZFCP_DEFINE_ADAPTER_ATTR(in_recovery, "%d\n", atomic_test_mask
  78                          (ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status));
  79
  80 /**
  81  * zfcp_sysfs_port_add_store - add a port to sysfs tree
  82  * @dev: pointer to belonging device
  83  * @buf: pointer to input buffer
  84  * @count: number of bytes in buffer
  85  *
  86  * Store function of the "port_add" attribute of an adapter.
  87  */
  88 static ssize_t
  89 zfcp_sysfs_port_add_store(struct device *dev, const char *buf, size_t count)
  90 {
  91         wwn_t wwpn;
  92         char *endp;
  93         struct zfcp_adapter *adapter;
  94         struct zfcp_port *port;
  95         int retval = -EINVAL;
  96
  97         down(&zfcp_data.config_sema);
  98
  99         adapter = dev_get_drvdata(dev);
 100         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
 101                 retval = -EBUSY;
 102                 goto out;
 103         }
 104
 105         wwpn = simple_strtoull(buf, &endp, 0);
 106         if ((endp + 1) < (buf + count))
 107                 goto out;
 108
 109         port = zfcp_port_enqueue(adapter, wwpn, 0, 0);
 110         if (!port)
 111                 goto out;
 112
 113         retval = 0;
 114
 115         zfcp_erp_port_reopen(port, 0);
 116         zfcp_erp_wait(port->adapter);
 117         zfcp_port_put(port);
 118  out:
 119         up(&zfcp_data.config_sema);
 120         return retval ? retval : (ssize_t) count;
 121 }
 122
 123 static DEVICE_ATTR(port_add, S_IWUSR, NULL, zfcp_sysfs_port_add_store);
 124
 125 /**
 126  * zfcp_sysfs_port_remove_store - remove a port from sysfs tree
 127  * @dev: pointer to belonging device
 128  * @buf: pointer to input buffer
 129  * @count: number of bytes in buffer
 130  *
 131  * Store function of the "port_remove" attribute of an adapter.
 132  */
 133 static ssize_t
 134 zfcp_sysfs_port_remove_store(struct device *dev, const char *buf, size_t count)
 135 {
 136         struct zfcp_adapter *adapter;
 137         struct zfcp_port *port;
 138         wwn_t wwpn;
 139         char *endp;
 140         int retval = 0;
 141
 142         down(&zfcp_data.config_sema);
 143
 144         adapter = dev_get_drvdata(dev);
 145         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
 146                 retval = -EBUSY;
 147                 goto out;
 148         }
 149
 150         wwpn = simple_strtoull(buf, &endp, 0);
 151         if ((endp + 1) < (buf + count)) {
 152                 retval = -EINVAL;
 153                 goto out;
 154         }
 155
 156         write_lock_irq(&zfcp_data.config_lock);
 157         port = zfcp_get_port_by_wwpn(adapter, wwpn);
 158         if (port && (atomic_read(&port->refcount) == 0)) {
 159                 zfcp_port_get(port);
 160                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 161                 list_move(&port->list, &adapter->port_remove_lh);
 162         }
 163         else {
 164                 port = NULL;
 165         }
 166         write_unlock_irq(&zfcp_data.config_lock);
 167
 168         if (!port) {
 169                 retval = -ENXIO;
 170                 goto out;
 171         }
 172
 173         zfcp_erp_port_shutdown(port, 0);
 174         zfcp_erp_wait(adapter);
 175         zfcp_port_put(port);
 176         zfcp_port_dequeue(port);
 177  out:
 178         up(&zfcp_data.config_sema);
 179         return retval ? retval : (ssize_t) count;
 180 }
 181
 182 static DEVICE_ATTR(port_remove, S_IWUSR, NULL, zfcp_sysfs_port_remove_store);
 183
 184 /**
 185  * zfcp_sysfs_adapter_failed_store - failed state of adapter
 186  * @dev: pointer to belonging device
 187  * @buf: pointer to input buffer
 188  * @count: number of bytes in buffer
 189  *
 190  * Store function of the "failed" attribute of an adapter.
 191  * If a "0" gets written to "failed", error recovery will be
 192  * started for the belonging adapter.
 193  */
 194 static ssize_t
 195 zfcp_sysfs_adapter_failed_store(struct device *dev,
 196                                 const char *buf, size_t count)
 197 {
 198         struct zfcp_adapter *adapter;
 199         unsigned int val;
 200         char *endp;
 201         int retval = 0;
 202
 203         down(&zfcp_data.config_sema);
 204
 205         adapter = dev_get_drvdata(dev);
 206         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
 207                 retval = -EBUSY;
 208                 goto out;
 209         }
 210
 211         val = simple_strtoul(buf, &endp, 0);
 212         if (((endp + 1) < (buf + count)) || (val != 0)) {
 213                 retval = -EINVAL;
 214                 goto out;
 215         }
 216
 217         zfcp_erp_modify_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING,
 218                                        ZFCP_SET);
 219         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
 220         zfcp_erp_wait(adapter);
 221  out:
 222         up(&zfcp_data.config_sema);
 223         return retval ? retval : (ssize_t) count;
 224 }
 225
 226 /**
 227  * zfcp_sysfs_adapter_failed_show - failed state of adapter
 228  * @dev: pointer to belonging device
 229  * @buf: pointer to input buffer
 230  *
 231  * Show function of "failed" attribute of adapter. Will be
 232  * "0" if adapter is working, otherwise "1".
 233  */
 234 static ssize_t
 235 zfcp_sysfs_adapter_failed_show(struct device *dev, char *buf)
 236 {
 237         struct zfcp_adapter *adapter;
 238
 239         adapter = dev_get_drvdata(dev);
 240         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status))
 241                 return sprintf(buf, "1\n");
 242         else
 243                 return sprintf(buf, "0\n");
 244 }
 245
 246 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_adapter_failed_show,
 247                    zfcp_sysfs_adapter_failed_store);
 248
 249 static struct attribute *zfcp_adapter_attrs[] = {
 250         &dev_attr_failed.attr,
 251         &dev_attr_in_recovery.attr,
 252         &dev_attr_port_remove.attr,
 253         &dev_attr_port_add.attr,
 254         &dev_attr_wwnn.attr,
 255         &dev_attr_wwpn.attr,
 256         &dev_attr_s_id.attr,
 257         &dev_attr_card_version.attr,
 258         &dev_attr_lic_version.attr,
 259         &dev_attr_fc_link_speed.attr,
 260         &dev_attr_fc_service_class.attr,
 261         &dev_attr_fc_topology.attr,
 262         &dev_attr_scsi_host_no.attr,
 263         &dev_attr_status.attr,
 264         &dev_attr_hardware_version.attr,
 265         &dev_attr_serial_number.attr,
 266         NULL
 267 };
 268
 269 static struct attribute_group zfcp_adapter_attr_group = {
 270         .attrs = zfcp_adapter_attrs,
 271 };
 272
 273 /**
 274  * zfcp_sysfs_create_adapter_files - create sysfs adapter files
 275  * @dev: pointer to belonging device
 276  *
 277  * Create all attributes of the sysfs representation of an adapter.
 278  */
 279 int
 280 zfcp_sysfs_adapter_create_files(struct device *dev)
 281 {
 282         return sysfs_create_group(&dev->kobj, &zfcp_adapter_attr_group);
 283 }
 284
 285 /**
 286  * zfcp_sysfs_remove_adapter_files - remove sysfs adapter files
 287  * @dev: pointer to belonging device
 288  *
 289  * Remove all attributes of the sysfs representation of an adapter.
 290  */
 291 void
 292 zfcp_sysfs_adapter_remove_files(struct device *dev)
 293 {
 294         sysfs_remove_group(&dev->kobj, &zfcp_adapter_attr_group);
 295 }
 296
 297 #undef ZFCP_LOG_AREA