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  *      Andreas Herrmann <aherrman@de.ibm.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2, or (at your option)
  18  * any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  28  */
  29
  30 #define ZFCP_SYSFS_ADAPTER_C_REVISION "$Revision: 1.38 $"
  31
  32 #include "zfcp_ext.h"
  33
  34 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  35
  36 static const char fc_topologies[5][25] = {
  37         "<error>",
  38         "point-to-point",
  39         "fabric",
  40         "arbitrated loop",
  41         "fabric (virt. adapter)"
  42 };
  43
  44 /**
  45  * ZFCP_DEFINE_ADAPTER_ATTR
  46  * @_name:   name of show attribute
  47  * @_format: format string
  48  * @_value:  value to print
  49  *
  50  * Generates attributes for an adapter.
  51  */
  52 #define ZFCP_DEFINE_ADAPTER_ATTR(_name, _format, _value)                      \
  53 static ssize_t zfcp_sysfs_adapter_##_name##_show(struct device *dev, struct device_attribute *attr,          \
  54                                                  char *buf)                   \
  55 {                                                                             \
  56         struct zfcp_adapter *adapter;                                         \
  57                                                                               \
  58         adapter = dev_get_drvdata(dev);                                       \
  59         return sprintf(buf, _format, _value);                                 \
  60 }                                                                             \
  61                                                                               \
  62 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_adapter_##_name##_show, NULL);
  63
  64 ZFCP_DEFINE_ADAPTER_ATTR(status, "0x%08x\n", atomic_read(&adapter->status));
  65 ZFCP_DEFINE_ADAPTER_ATTR(wwnn, "0x%016llx\n", adapter->wwnn);
  66 ZFCP_DEFINE_ADAPTER_ATTR(wwpn, "0x%016llx\n", adapter->wwpn);
  67 ZFCP_DEFINE_ADAPTER_ATTR(s_id, "0x%06x\n", adapter->s_id);
  68 ZFCP_DEFINE_ADAPTER_ATTR(peer_wwnn, "0x%016llx\n", adapter->peer_wwnn);
  69 ZFCP_DEFINE_ADAPTER_ATTR(peer_wwpn, "0x%016llx\n", adapter->peer_wwpn);
  70 ZFCP_DEFINE_ADAPTER_ATTR(peer_d_id, "0x%06x\n", adapter->peer_d_id);
  71 ZFCP_DEFINE_ADAPTER_ATTR(card_version, "0x%04x\n", adapter->hydra_version);
  72 ZFCP_DEFINE_ADAPTER_ATTR(lic_version, "0x%08x\n", adapter->fsf_lic_version);
  73 ZFCP_DEFINE_ADAPTER_ATTR(fc_link_speed, "%d Gb/s\n", adapter->fc_link_speed);
  74 ZFCP_DEFINE_ADAPTER_ATTR(fc_service_class, "%d\n", adapter->fc_service_class);
  75 ZFCP_DEFINE_ADAPTER_ATTR(fc_topology, "%s\n",
  76                          fc_topologies[adapter->fc_topology]);
  77 ZFCP_DEFINE_ADAPTER_ATTR(hardware_version, "0x%08x\n",
  78                          adapter->hardware_version);
  79 ZFCP_DEFINE_ADAPTER_ATTR(serial_number, "%17s\n", adapter->serial_number);
  80 ZFCP_DEFINE_ADAPTER_ATTR(scsi_host_no, "0x%x\n", adapter->scsi_host_no);
  81 ZFCP_DEFINE_ADAPTER_ATTR(in_recovery, "%d\n", atomic_test_mask
  82                          (ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status));
  83
  84 /**
  85  * zfcp_sysfs_port_add_store - add a port to sysfs tree
  86  * @dev: pointer to belonging device
  87  * @buf: pointer to input buffer
  88  * @count: number of bytes in buffer
  89  *
  90  * Store function of the "port_add" attribute of an adapter.
  91  */
  92 static ssize_t
  93 zfcp_sysfs_port_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  94 {
  95         wwn_t wwpn;
  96         char *endp;
  97         struct zfcp_adapter *adapter;
  98         struct zfcp_port *port;
  99         int retval = -EINVAL;
 100
 101         down(&zfcp_data.config_sema);
 102
 103         adapter = dev_get_drvdata(dev);
 104         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
 105                 retval = -EBUSY;
 106                 goto out;
 107         }
 108
 109         wwpn = simple_strtoull(buf, &endp, 0);
 110         if ((endp + 1) < (buf + count))
 111                 goto out;
 112
 113         port = zfcp_port_enqueue(adapter, wwpn, 0, 0);
 114         if (!port)
 115                 goto out;
 116
 117         retval = 0;
 118
 119         zfcp_erp_port_reopen(port, 0);
 120         zfcp_erp_wait(port->adapter);
 121         zfcp_port_put(port);
 122  out:
 123         up(&zfcp_data.config_sema);
 124         return retval ? retval : (ssize_t) count;
 125 }
 126
 127 static DEVICE_ATTR(port_add, S_IWUSR, NULL, zfcp_sysfs_port_add_store);
 128
 129 /**
 130  * zfcp_sysfs_port_remove_store - remove a port from sysfs tree
 131  * @dev: pointer to belonging device
 132  * @buf: pointer to input buffer
 133  * @count: number of bytes in buffer
 134  *
 135  * Store function of the "port_remove" attribute of an adapter.
 136  */
 137 static ssize_t
 138 zfcp_sysfs_port_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 139 {
 140         struct zfcp_adapter *adapter;
 141         struct zfcp_port *port;
 142         wwn_t wwpn;
 143         char *endp;
 144         int retval = 0;
 145
 146         down(&zfcp_data.config_sema);
 147
 148         adapter = dev_get_drvdata(dev);
 149         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
 150                 retval = -EBUSY;
 151                 goto out;
 152         }
 153
 154         wwpn = simple_strtoull(buf, &endp, 0);
 155         if ((endp + 1) < (buf + count)) {
 156                 retval = -EINVAL;
 157                 goto out;
 158         }
 159
 160         write_lock_irq(&zfcp_data.config_lock);
 161         port = zfcp_get_port_by_wwpn(adapter, wwpn);
 162         if (port && (atomic_read(&port->refcount) == 0)) {
 163                 zfcp_port_get(port);
 164                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 165                 list_move(&port->list, &adapter->port_remove_lh);
 166         }
 167         else {
 168                 port = NULL;
 169         }
 170         write_unlock_irq(&zfcp_data.config_lock);
 171
 172         if (!port) {
 173                 retval = -ENXIO;
 174                 goto out;
 175         }
 176
 177         zfcp_erp_port_shutdown(port, 0);
 178         zfcp_erp_wait(adapter);
 179         zfcp_port_put(port);
 180         zfcp_port_dequeue(port);
 181  out:
 182         up(&zfcp_data.config_sema);
 183         return retval ? retval : (ssize_t) count;
 184 }
 185
 186 static DEVICE_ATTR(port_remove, S_IWUSR, NULL, zfcp_sysfs_port_remove_store);
 187
 188 /**
 189  * zfcp_sysfs_adapter_failed_store - failed state of adapter
 190  * @dev: pointer to belonging device
 191  * @buf: pointer to input buffer
 192  * @count: number of bytes in buffer
 193  *
 194  * Store function of the "failed" attribute of an adapter.
 195  * If a "0" gets written to "failed", error recovery will be
 196  * started for the belonging adapter.
 197  */
 198 static ssize_t
 199 zfcp_sysfs_adapter_failed_store(struct device *dev, struct device_attribute *attr,
 200                                 const char *buf, size_t count)
 201 {
 202         struct zfcp_adapter *adapter;
 203         unsigned int val;
 204         char *endp;
 205         int retval = 0;
 206
 207         down(&zfcp_data.config_sema);
 208
 209         adapter = dev_get_drvdata(dev);
 210         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
 211                 retval = -EBUSY;
 212                 goto out;
 213         }
 214
 215         val = simple_strtoul(buf, &endp, 0);
 216         if (((endp + 1) < (buf + count)) || (val != 0)) {
 217                 retval = -EINVAL;
 218                 goto out;
 219         }
 220
 221         zfcp_erp_modify_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING,
 222                                        ZFCP_SET);
 223         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
 224         zfcp_erp_wait(adapter);
 225  out:
 226         up(&zfcp_data.config_sema);
 227         return retval ? retval : (ssize_t) count;
 228 }
 229
 230 /**
 231  * zfcp_sysfs_adapter_failed_show - failed state of adapter
 232  * @dev: pointer to belonging device
 233  * @buf: pointer to input buffer
 234  *
 235  * Show function of "failed" attribute of adapter. Will be
 236  * "0" if adapter is working, otherwise "1".
 237  */
 238 static ssize_t
 239 zfcp_sysfs_adapter_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
 240 {
 241         struct zfcp_adapter *adapter;
 242
 243         adapter = dev_get_drvdata(dev);
 244         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status))
 245                 return sprintf(buf, "1\n");
 246         else
 247                 return sprintf(buf, "0\n");
 248 }
 249
 250 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_adapter_failed_show,
 251                    zfcp_sysfs_adapter_failed_store);
 252
 253 static struct attribute *zfcp_adapter_attrs[] = {
 254         &dev_attr_failed.attr,
 255         &dev_attr_in_recovery.attr,
 256         &dev_attr_port_remove.attr,
 257         &dev_attr_port_add.attr,
 258         &dev_attr_wwnn.attr,
 259         &dev_attr_wwpn.attr,
 260         &dev_attr_s_id.attr,
 261         &dev_attr_peer_wwnn.attr,
 262         &dev_attr_peer_wwpn.attr,
 263         &dev_attr_peer_d_id.attr,
 264         &dev_attr_card_version.attr,
 265         &dev_attr_lic_version.attr,
 266         &dev_attr_fc_link_speed.attr,
 267         &dev_attr_fc_service_class.attr,
 268         &dev_attr_fc_topology.attr,
 269         &dev_attr_scsi_host_no.attr,
 270         &dev_attr_status.attr,
 271         &dev_attr_hardware_version.attr,
 272         &dev_attr_serial_number.attr,
 273         NULL
 274 };
 275
 276 static struct attribute_group zfcp_adapter_attr_group = {
 277         .attrs = zfcp_adapter_attrs,
 278 };
 279
 280 /**
 281  * zfcp_sysfs_create_adapter_files - create sysfs adapter files
 282  * @dev: pointer to belonging device
 283  *
 284  * Create all attributes of the sysfs representation of an adapter.
 285  */
 286 int
 287 zfcp_sysfs_adapter_create_files(struct device *dev)
 288 {
 289         return sysfs_create_group(&dev->kobj, &zfcp_adapter_attr_group);
 290 }
 291
 292 /**
 293  * zfcp_sysfs_remove_adapter_files - remove sysfs adapter files
 294  * @dev: pointer to belonging device
 295  *
 296  * Remove all attributes of the sysfs representation of an adapter.
 297  */
 298 void
 299 zfcp_sysfs_adapter_remove_files(struct device *dev)
 300 {
 301         sysfs_remove_group(&dev->kobj, &zfcp_adapter_attr_group);
 302 }
 303
 304 #undef ZFCP_LOG_AREA