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