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