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