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(peer_wwnn, "0x%016llx\n", adapter->peer_wwnn);
  66 ZFCP_DEFINE_ADAPTER_ATTR(peer_wwpn, "0x%016llx\n", adapter->peer_wwpn);
  67 ZFCP_DEFINE_ADAPTER_ATTR(peer_d_id, "0x%06x\n", adapter->peer_d_id);
  68 ZFCP_DEFINE_ADAPTER_ATTR(physical_wwpn, "0x%016llx\n", adapter->physical_wwpn);
  69 ZFCP_DEFINE_ADAPTER_ATTR(physical_s_id, "0x%06x\n", adapter->physical_s_id);
  70 ZFCP_DEFINE_ADAPTER_ATTR(card_version, "0x%04x\n", adapter->hydra_version);
  71 ZFCP_DEFINE_ADAPTER_ATTR(lic_version, "0x%08x\n", adapter->fsf_lic_version);
  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(in_recovery, "%d\n", atomic_test_mask
  77                          (ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status));
  78
  79 /**
  80  * zfcp_sysfs_port_add_store - add a port to sysfs tree
  81  * @dev: pointer to belonging device
  82  * @buf: pointer to input buffer
  83  * @count: number of bytes in buffer
  84  *
  85  * Store function of the "port_add" attribute of an adapter.
  86  */
  87 static ssize_t
  88 zfcp_sysfs_port_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  89 {
  90         wwn_t wwpn;
  91         char *endp;
  92         struct zfcp_adapter *adapter;
  93         struct zfcp_port *port;
  94         int retval = -EINVAL;
  95
  96         down(&zfcp_data.config_sema);
  97
  98         adapter = dev_get_drvdata(dev);
  99         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
 100                 retval = -EBUSY;
 101                 goto out;
 102         }
 103
 104         wwpn = simple_strtoull(buf, &endp, 0);
 105         if ((endp + 1) < (buf + count))
 106                 goto out;
 107
 108         port = zfcp_port_enqueue(adapter, wwpn, 0, 0);
 109         if (!port)
 110                 goto out;
 111
 112         retval = 0;
 113
 114         zfcp_erp_port_reopen(port, 0);
 115         zfcp_erp_wait(port->adapter);
 116         zfcp_port_put(port);
 117  out:
 118         up(&zfcp_data.config_sema);
 119         return retval ? retval : (ssize_t) count;
 120 }
 121
 122 static DEVICE_ATTR(port_add, S_IWUSR, NULL, zfcp_sysfs_port_add_store);
 123
 124 /**
 125  * zfcp_sysfs_port_remove_store - remove a port from sysfs tree
 126  * @dev: pointer to belonging device
 127  * @buf: pointer to input buffer
 128  * @count: number of bytes in buffer
 129  *
 130  * Store function of the "port_remove" attribute of an adapter.
 131  */
 132 static ssize_t
 133 zfcp_sysfs_port_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 134 {
 135         struct zfcp_adapter *adapter;
 136         struct zfcp_port *port;
 137         wwn_t wwpn;
 138         char *endp;
 139         int retval = 0;
 140
 141         down(&zfcp_data.config_sema);
 142
 143         adapter = dev_get_drvdata(dev);
 144         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
 145                 retval = -EBUSY;
 146                 goto out;
 147         }
 148
 149         wwpn = simple_strtoull(buf, &endp, 0);
 150         if ((endp + 1) < (buf + count)) {
 151                 retval = -EINVAL;
 152                 goto out;
 153         }
 154
 155         write_lock_irq(&zfcp_data.config_lock);
 156         port = zfcp_get_port_by_wwpn(adapter, wwpn);
 157         if (port && (atomic_read(&port->refcount) == 0)) {
 158                 zfcp_port_get(port);
 159                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 160                 list_move(&port->list, &adapter->port_remove_lh);
 161         }
 162         else {
 163                 port = NULL;
 164         }
 165         write_unlock_irq(&zfcp_data.config_lock);
 166
 167         if (!port) {
 168                 retval = -ENXIO;
 169                 goto out;
 170         }
 171
 172         zfcp_erp_port_shutdown(port, 0);
 173         zfcp_erp_wait(adapter);
 174         zfcp_port_put(port);
 175         zfcp_port_dequeue(port);
 176  out:
 177         up(&zfcp_data.config_sema);
 178         return retval ? retval : (ssize_t) count;
 179 }
 180
 181 static DEVICE_ATTR(port_remove, S_IWUSR, NULL, zfcp_sysfs_port_remove_store);
 182
 183 /**
 184  * zfcp_sysfs_adapter_failed_store - failed state of adapter
 185  * @dev: pointer to belonging device
 186  * @buf: pointer to input buffer
 187  * @count: number of bytes in buffer
 188  *
 189  * Store function of the "failed" attribute of an adapter.
 190  * If a "0" gets written to "failed", error recovery will be
 191  * started for the belonging adapter.
 192  */
 193 static ssize_t
 194 zfcp_sysfs_adapter_failed_store(struct device *dev, struct device_attribute *attr,
 195                                 const char *buf, size_t count)
 196 {
 197         struct zfcp_adapter *adapter;
 198         unsigned int val;
 199         char *endp;
 200         int retval = 0;
 201
 202         down(&zfcp_data.config_sema);
 203
 204         adapter = dev_get_drvdata(dev);
 205         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status)) {
 206                 retval = -EBUSY;
 207                 goto out;
 208         }
 209
 210         val = simple_strtoul(buf, &endp, 0);
 211         if (((endp + 1) < (buf + count)) || (val != 0)) {
 212                 retval = -EINVAL;
 213                 goto out;
 214         }
 215
 216         zfcp_erp_modify_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING,
 217                                        ZFCP_SET);
 218         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
 219         zfcp_erp_wait(adapter);
 220  out:
 221         up(&zfcp_data.config_sema);
 222         return retval ? retval : (ssize_t) count;
 223 }
 224
 225 /**
 226  * zfcp_sysfs_adapter_failed_show - failed state of adapter
 227  * @dev: pointer to belonging device
 228  * @buf: pointer to input buffer
 229  *
 230  * Show function of "failed" attribute of adapter. Will be
 231  * "0" if adapter is working, otherwise "1".
 232  */
 233 static ssize_t
 234 zfcp_sysfs_adapter_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
 235 {
 236         struct zfcp_adapter *adapter;
 237
 238         adapter = dev_get_drvdata(dev);
 239         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status))
 240                 return sprintf(buf, "1\n");
 241         else
 242                 return sprintf(buf, "0\n");
 243 }
 244
 245 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_adapter_failed_show,
 246                    zfcp_sysfs_adapter_failed_store);
 247
 248 static struct attribute *zfcp_adapter_attrs[] = {
 249         &dev_attr_failed.attr,
 250         &dev_attr_in_recovery.attr,
 251         &dev_attr_port_remove.attr,
 252         &dev_attr_port_add.attr,
 253         &dev_attr_peer_wwnn.attr,
 254         &dev_attr_peer_wwpn.attr,
 255         &dev_attr_peer_d_id.attr,
 256         &dev_attr_physical_wwpn.attr,
 257         &dev_attr_physical_s_id.attr,
 258         &dev_attr_card_version.attr,
 259         &dev_attr_lic_version.attr,
 260         &dev_attr_fc_topology.attr,
 261         &dev_attr_status.attr,
 262         &dev_attr_hardware_version.attr,
 263         NULL
 264 };
 265
 266 static struct attribute_group zfcp_adapter_attr_group = {
 267         .attrs = zfcp_adapter_attrs,
 268 };
 269
 270 /**
 271  * zfcp_sysfs_create_adapter_files - create sysfs adapter files
 272  * @dev: pointer to belonging device
 273  *
 274  * Create all attributes of the sysfs representation of an adapter.
 275  */
 276 int
 277 zfcp_sysfs_adapter_create_files(struct device *dev)
 278 {
 279         return sysfs_create_group(&dev->kobj, &zfcp_adapter_attr_group);
 280 }
 281
 282 /**
 283  * zfcp_sysfs_remove_adapter_files - remove sysfs adapter files
 284  * @dev: pointer to belonging device
 285  *
 286  * Remove all attributes of the sysfs representation of an adapter.
 287  */
 288 void
 289 zfcp_sysfs_adapter_remove_files(struct device *dev)
 290 {
 291         sysfs_remove_group(&dev->kobj, &zfcp_adapter_attr_group);
 292 }
 293
 294 #undef ZFCP_LOG_AREA