drivers/s390/scsi/zfcp_sysfs_port.c

   1 /*
   2  * linux/drivers/s390/scsi/zfcp_sysfs_port.c
   3  *
   4  * FCP adapter driver for IBM eServer zSeries
   5  *
   6  * sysfs port 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  *      Volker Sameske <sameske@de.ibm.com>
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2, or (at your option)
  19  * any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30
  31 #define ZFCP_SYSFS_PORT_C_REVISION "$Revision: 1.47 $"
  32
  33 #include "zfcp_ext.h"
  34
  35 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  36
  37 /**
  38  * zfcp_sysfs_port_release - gets called when a struct device port is released
  39  * @dev: pointer to belonging device
  40  */
  41 void
  42 zfcp_sysfs_port_release(struct device *dev)
  43 {
  44         kfree(dev);
  45 }
  46
  47 /**
  48  * ZFCP_DEFINE_PORT_ATTR
  49  * @_name:   name of show attribute
  50  * @_format: format string
  51  * @_value:  value to print
  52  *
  53  * Generates attributes for a port.
  54  */
  55 #define ZFCP_DEFINE_PORT_ATTR(_name, _format, _value)                    \
  56 static ssize_t zfcp_sysfs_port_##_name##_show(struct device *dev,        \
  57                                               char *buf)                 \
  58 {                                                                        \
  59         struct zfcp_port *port;                                          \
  60                                                                          \
  61         port = dev_get_drvdata(dev);                                     \
  62         return sprintf(buf, _format, _value);                            \
  63 }                                                                        \
  64                                                                          \
  65 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_port_##_name##_show, NULL);
  66
  67 ZFCP_DEFINE_PORT_ATTR(status, "0x%08x\n", atomic_read(&port->status));
  68 ZFCP_DEFINE_PORT_ATTR(wwnn, "0x%016llx\n", port->wwnn);
  69 ZFCP_DEFINE_PORT_ATTR(d_id, "0x%06x\n", port->d_id);
  70 ZFCP_DEFINE_PORT_ATTR(scsi_id, "0x%x\n", port->scsi_id);
  71 ZFCP_DEFINE_PORT_ATTR(in_recovery, "%d\n", atomic_test_mask
  72                       (ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
  73 ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
  74                       (ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
  75
  76 /**
  77  * zfcp_sysfs_unit_add_store - add a unit to sysfs tree
  78  * @dev: pointer to belonging device
  79  * @buf: pointer to input buffer
  80  * @count: number of bytes in buffer
  81  *
  82  * Store function of the "unit_add" attribute of a port.
  83  */
  84 static ssize_t
  85 zfcp_sysfs_unit_add_store(struct device *dev, const char *buf, size_t count)
  86 {
  87         fcp_lun_t fcp_lun;
  88         char *endp;
  89         struct zfcp_port *port;
  90         struct zfcp_unit *unit;
  91         int retval = -EINVAL;
  92
  93         down(&zfcp_data.config_sema);
  94
  95         port = dev_get_drvdata(dev);
  96         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
  97                 retval = -EBUSY;
  98                 goto out;
  99         }
 100
 101         fcp_lun = simple_strtoull(buf, &endp, 0);
 102         if ((endp + 1) < (buf + count))
 103                 goto out;
 104
 105         unit = zfcp_unit_enqueue(port, fcp_lun);
 106         if (!unit)
 107                 goto out;
 108
 109         retval = 0;
 110
 111         zfcp_erp_unit_reopen(unit, 0);
 112         zfcp_erp_wait(unit->port->adapter);
 113         zfcp_unit_put(unit);
 114  out:
 115         up(&zfcp_data.config_sema);
 116         return retval ? retval : (ssize_t) count;
 117 }
 118
 119 static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
 120
 121 /**
 122  * zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
 123  * @dev: pointer to belonging device
 124  * @buf: pointer to input buffer
 125  * @count: number of bytes in buffer
 126  */
 127 static ssize_t
 128 zfcp_sysfs_unit_remove_store(struct device *dev, const char *buf, size_t count)
 129 {
 130         struct zfcp_port *port;
 131         struct zfcp_unit *unit;
 132         fcp_lun_t fcp_lun;
 133         char *endp;
 134         int retval = 0;
 135
 136         down(&zfcp_data.config_sema);
 137
 138         port = dev_get_drvdata(dev);
 139         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
 140                 retval = -EBUSY;
 141                 goto out;
 142         }
 143
 144         fcp_lun = simple_strtoull(buf, &endp, 0);
 145         if ((endp + 1) < (buf + count)) {
 146                 retval = -EINVAL;
 147                 goto out;
 148         }
 149
 150         write_lock_irq(&zfcp_data.config_lock);
 151         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 152         if (unit && (atomic_read(&unit->refcount) == 0)) {
 153                 zfcp_unit_get(unit);
 154                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 155                 list_move(&unit->list, &port->unit_remove_lh);
 156         }
 157         else {
 158                 unit = NULL;
 159         }
 160         write_unlock_irq(&zfcp_data.config_lock);
 161
 162         if (!unit) {
 163                 retval = -ENXIO;
 164                 goto out;
 165         }
 166
 167         zfcp_erp_unit_shutdown(unit, 0);
 168         zfcp_erp_wait(unit->port->adapter);
 169         zfcp_unit_put(unit);
 170         zfcp_unit_dequeue(unit);
 171  out:
 172         up(&zfcp_data.config_sema);
 173         return retval ? retval : (ssize_t) count;
 174 }
 175
 176 static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
 177
 178 /**
 179  * zfcp_sysfs_port_failed_store - failed state of port
 180  * @dev: pointer to belonging device
 181  * @buf: pointer to input buffer
 182  * @count: number of bytes in buffer
 183  *
 184  * Store function of the "failed" attribute of a port.
 185  * If a "0" gets written to "failed", error recovery will be
 186  * started for the belonging port.
 187  */
 188 static ssize_t
 189 zfcp_sysfs_port_failed_store(struct device *dev, const char *buf, size_t count)
 190 {
 191         struct zfcp_port *port;
 192         unsigned int val;
 193         char *endp;
 194         int retval = 0;
 195
 196         down(&zfcp_data.config_sema);
 197
 198         port = dev_get_drvdata(dev);
 199         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
 200                 retval = -EBUSY;
 201                 goto out;
 202         }
 203
 204         val = simple_strtoul(buf, &endp, 0);
 205         if (((endp + 1) < (buf + count)) || (val != 0)) {
 206                 retval = -EINVAL;
 207                 goto out;
 208         }
 209
 210         zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 211         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 212         zfcp_erp_wait(port->adapter);
 213  out:
 214         up(&zfcp_data.config_sema);
 215         return retval ? retval : (ssize_t) count;
 216 }
 217
 218 /**
 219  * zfcp_sysfs_port_failed_show - failed state of port
 220  * @dev: pointer to belonging device
 221  * @buf: pointer to input buffer
 222  *
 223  * Show function of "failed" attribute of port. Will be
 224  * "0" if port is working, otherwise "1".
 225  */
 226 static ssize_t
 227 zfcp_sysfs_port_failed_show(struct device *dev, char *buf)
 228 {
 229         struct zfcp_port *port;
 230
 231         port = dev_get_drvdata(dev);
 232         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status))
 233                 return sprintf(buf, "1\n");
 234         else
 235                 return sprintf(buf, "0\n");
 236 }
 237
 238 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_port_failed_show,
 239                    zfcp_sysfs_port_failed_store);
 240
 241 /**
 242  * zfcp_port_common_attrs
 243  * sysfs attributes that are common for all kind of fc ports.
 244  */
 245 static struct attribute *zfcp_port_common_attrs[] = {
 246         &dev_attr_failed.attr,
 247         &dev_attr_in_recovery.attr,
 248         &dev_attr_status.attr,
 249         &dev_attr_wwnn.attr,
 250         &dev_attr_d_id.attr,
 251         &dev_attr_access_denied.attr,
 252         NULL
 253 };
 254
 255 static struct attribute_group zfcp_port_common_attr_group = {
 256         .attrs = zfcp_port_common_attrs,
 257 };
 258
 259 /**
 260  * zfcp_port_no_ns_attrs
 261  * sysfs attributes not to be used for nameserver ports.
 262  */
 263 static struct attribute *zfcp_port_no_ns_attrs[] = {
 264         &dev_attr_unit_add.attr,
 265         &dev_attr_unit_remove.attr,
 266         &dev_attr_scsi_id.attr,
 267         NULL
 268 };
 269
 270 static struct attribute_group zfcp_port_no_ns_attr_group = {
 271         .attrs = zfcp_port_no_ns_attrs,
 272 };
 273
 274 /**
 275  * zfcp_sysfs_port_create_files - create sysfs port files
 276  * @dev: pointer to belonging device
 277  *
 278  * Create all attributes of the sysfs representation of a port.
 279  */
 280 int
 281 zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
 282 {
 283         int retval;
 284
 285         retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
 286
 287         if ((flags & ZFCP_STATUS_PORT_WKA) || retval)
 288                 return retval;
 289
 290         retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
 291         if (retval)
 292                 sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
 293
 294         return retval;
 295 }
 296
 297 /**
 298  * zfcp_sysfs_port_remove_files - remove sysfs port files
 299  * @dev: pointer to belonging device
 300  *
 301  * Remove all attributes of the sysfs representation of a port.
 302  */
 303 void
 304 zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
 305 {
 306         sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
 307         if (!(flags & ZFCP_STATUS_PORT_WKA))
 308                 sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
 309 }
 310
 311 #undef ZFCP_LOG_AREA