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, struct device_attribute *attr,        \
  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(in_recovery, "%d\n", atomic_test_mask
  71                       (ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
  72 ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
  73                       (ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
  74
  75 /**
  76  * zfcp_sysfs_unit_add_store - add a unit to sysfs tree
  77  * @dev: pointer to belonging device
  78  * @buf: pointer to input buffer
  79  * @count: number of bytes in buffer
  80  *
  81  * Store function of the "unit_add" attribute of a port.
  82  */
  83 static ssize_t
  84 zfcp_sysfs_unit_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  85 {
  86         fcp_lun_t fcp_lun;
  87         char *endp;
  88         struct zfcp_port *port;
  89         struct zfcp_unit *unit;
  90         int retval = -EINVAL;
  91
  92         down(&zfcp_data.config_sema);
  93
  94         port = dev_get_drvdata(dev);
  95         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
  96                 retval = -EBUSY;
  97                 goto out;
  98         }
  99
 100         fcp_lun = simple_strtoull(buf, &endp, 0);
 101         if ((endp + 1) < (buf + count))
 102                 goto out;
 103
 104         unit = zfcp_unit_enqueue(port, fcp_lun);
 105         if (!unit)
 106                 goto out;
 107
 108         retval = 0;
 109
 110         zfcp_erp_unit_reopen(unit, 0);
 111         zfcp_erp_wait(unit->port->adapter);
 112         zfcp_unit_put(unit);
 113  out:
 114         up(&zfcp_data.config_sema);
 115         return retval ? retval : (ssize_t) count;
 116 }
 117
 118 static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
 119
 120 /**
 121  * zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
 122  * @dev: pointer to belonging device
 123  * @buf: pointer to input buffer
 124  * @count: number of bytes in buffer
 125  */
 126 static ssize_t
 127 zfcp_sysfs_unit_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 128 {
 129         struct zfcp_port *port;
 130         struct zfcp_unit *unit;
 131         fcp_lun_t fcp_lun;
 132         char *endp;
 133         int retval = 0;
 134
 135         down(&zfcp_data.config_sema);
 136
 137         port = dev_get_drvdata(dev);
 138         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
 139                 retval = -EBUSY;
 140                 goto out;
 141         }
 142
 143         fcp_lun = simple_strtoull(buf, &endp, 0);
 144         if ((endp + 1) < (buf + count)) {
 145                 retval = -EINVAL;
 146                 goto out;
 147         }
 148
 149         write_lock_irq(&zfcp_data.config_lock);
 150         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 151         if (unit && (atomic_read(&unit->refcount) == 0)) {
 152                 zfcp_unit_get(unit);
 153                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 154                 list_move(&unit->list, &port->unit_remove_lh);
 155         }
 156         else {
 157                 unit = NULL;
 158         }
 159         write_unlock_irq(&zfcp_data.config_lock);
 160
 161         if (!unit) {
 162                 retval = -ENXIO;
 163                 goto out;
 164         }
 165
 166         zfcp_erp_unit_shutdown(unit, 0);
 167         zfcp_erp_wait(unit->port->adapter);
 168         zfcp_unit_put(unit);
 169         zfcp_unit_dequeue(unit);
 170  out:
 171         up(&zfcp_data.config_sema);
 172         return retval ? retval : (ssize_t) count;
 173 }
 174
 175 static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
 176
 177 /**
 178  * zfcp_sysfs_port_failed_store - failed state of port
 179  * @dev: pointer to belonging device
 180  * @buf: pointer to input buffer
 181  * @count: number of bytes in buffer
 182  *
 183  * Store function of the "failed" attribute of a port.
 184  * If a "0" gets written to "failed", error recovery will be
 185  * started for the belonging port.
 186  */
 187 static ssize_t
 188 zfcp_sysfs_port_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 189 {
 190         struct zfcp_port *port;
 191         unsigned int val;
 192         char *endp;
 193         int retval = 0;
 194
 195         down(&zfcp_data.config_sema);
 196
 197         port = dev_get_drvdata(dev);
 198         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
 199                 retval = -EBUSY;
 200                 goto out;
 201         }
 202
 203         val = simple_strtoul(buf, &endp, 0);
 204         if (((endp + 1) < (buf + count)) || (val != 0)) {
 205                 retval = -EINVAL;
 206                 goto out;
 207         }
 208
 209         zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 210         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 211         zfcp_erp_wait(port->adapter);
 212  out:
 213         up(&zfcp_data.config_sema);
 214         return retval ? retval : (ssize_t) count;
 215 }
 216
 217 /**
 218  * zfcp_sysfs_port_failed_show - failed state of port
 219  * @dev: pointer to belonging device
 220  * @buf: pointer to input buffer
 221  *
 222  * Show function of "failed" attribute of port. Will be
 223  * "0" if port is working, otherwise "1".
 224  */
 225 static ssize_t
 226 zfcp_sysfs_port_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
 227 {
 228         struct zfcp_port *port;
 229
 230         port = dev_get_drvdata(dev);
 231         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status))
 232                 return sprintf(buf, "1\n");
 233         else
 234                 return sprintf(buf, "0\n");
 235 }
 236
 237 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_port_failed_show,
 238                    zfcp_sysfs_port_failed_store);
 239
 240 /**
 241  * zfcp_port_common_attrs
 242  * sysfs attributes that are common for all kind of fc ports.
 243  */
 244 static struct attribute *zfcp_port_common_attrs[] = {
 245         &dev_attr_failed.attr,
 246         &dev_attr_in_recovery.attr,
 247         &dev_attr_status.attr,
 248         &dev_attr_wwnn.attr,
 249         &dev_attr_d_id.attr,
 250         &dev_attr_access_denied.attr,
 251         NULL
 252 };
 253
 254 static struct attribute_group zfcp_port_common_attr_group = {
 255         .attrs = zfcp_port_common_attrs,
 256 };
 257
 258 /**
 259  * zfcp_port_no_ns_attrs
 260  * sysfs attributes not to be used for nameserver ports.
 261  */
 262 static struct attribute *zfcp_port_no_ns_attrs[] = {
 263         &dev_attr_unit_add.attr,
 264         &dev_attr_unit_remove.attr,
 265         NULL
 266 };
 267
 268 static struct attribute_group zfcp_port_no_ns_attr_group = {
 269         .attrs = zfcp_port_no_ns_attrs,
 270 };
 271
 272 /**
 273  * zfcp_sysfs_port_create_files - create sysfs port files
 274  * @dev: pointer to belonging device
 275  *
 276  * Create all attributes of the sysfs representation of a port.
 277  */
 278 int
 279 zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
 280 {
 281         int retval;
 282
 283         retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
 284
 285         if ((flags & ZFCP_STATUS_PORT_WKA) || retval)
 286                 return retval;
 287
 288         retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
 289         if (retval)
 290                 sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
 291
 292         return retval;
 293 }
 294
 295 /**
 296  * zfcp_sysfs_port_remove_files - remove sysfs port files
 297  * @dev: pointer to belonging device
 298  *
 299  * Remove all attributes of the sysfs representation of a port.
 300  */
 301 void
 302 zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
 303 {
 304         sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
 305         if (!(flags & ZFCP_STATUS_PORT_WKA))
 306                 sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
 307 }
 308
 309 #undef ZFCP_LOG_AREA