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