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 #include "zfcp_ext.h"
  32
  33 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  34
  35 /**
  36  * zfcp_sysfs_port_release - gets called when a struct device port is released
  37  * @dev: pointer to belonging device
  38  */
  39 void
  40 zfcp_sysfs_port_release(struct device *dev)
  41 {
  42         kfree(dev);
  43 }
  44
  45 /**
  46  * ZFCP_DEFINE_PORT_ATTR
  47  * @_name:   name of show attribute
  48  * @_format: format string
  49  * @_value:  value to print
  50  *
  51  * Generates attributes for a port.
  52  */
  53 #define ZFCP_DEFINE_PORT_ATTR(_name, _format, _value)                    \
  54 static ssize_t zfcp_sysfs_port_##_name##_show(struct device *dev, struct device_attribute *attr,        \
  55                                               char *buf)                 \
  56 {                                                                        \
  57         struct zfcp_port *port;                                          \
  58                                                                          \
  59         port = dev_get_drvdata(dev);                                     \
  60         return sprintf(buf, _format, _value);                            \
  61 }                                                                        \
  62                                                                          \
  63 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_port_##_name##_show, NULL);
  64
  65 ZFCP_DEFINE_PORT_ATTR(status, "0x%08x\n", atomic_read(&port->status));
  66 ZFCP_DEFINE_PORT_ATTR(in_recovery, "%d\n", atomic_test_mask
  67                       (ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
  68 ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
  69                       (ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
  70
  71 /**
  72  * zfcp_sysfs_unit_add_store - add a unit to sysfs tree
  73  * @dev: pointer to belonging device
  74  * @buf: pointer to input buffer
  75  * @count: number of bytes in buffer
  76  *
  77  * Store function of the "unit_add" attribute of a port.
  78  */
  79 static ssize_t
  80 zfcp_sysfs_unit_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  81 {
  82         fcp_lun_t fcp_lun;
  83         char *endp;
  84         struct zfcp_port *port;
  85         struct zfcp_unit *unit;
  86         int retval = -EINVAL;
  87
  88         down(&zfcp_data.config_sema);
  89
  90         port = dev_get_drvdata(dev);
  91         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
  92                 retval = -EBUSY;
  93                 goto out;
  94         }
  95
  96         fcp_lun = simple_strtoull(buf, &endp, 0);
  97         if ((endp + 1) < (buf + count))
  98                 goto out;
  99
 100         unit = zfcp_unit_enqueue(port, fcp_lun);
 101         if (!unit)
 102                 goto out;
 103
 104         retval = 0;
 105
 106         zfcp_erp_unit_reopen(unit, 0);
 107         zfcp_erp_wait(unit->port->adapter);
 108         zfcp_unit_put(unit);
 109  out:
 110         up(&zfcp_data.config_sema);
 111         return retval ? retval : (ssize_t) count;
 112 }
 113
 114 static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
 115
 116 /**
 117  * zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
 118  * @dev: pointer to belonging device
 119  * @buf: pointer to input buffer
 120  * @count: number of bytes in buffer
 121  */
 122 static ssize_t
 123 zfcp_sysfs_unit_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 124 {
 125         struct zfcp_port *port;
 126         struct zfcp_unit *unit;
 127         fcp_lun_t fcp_lun;
 128         char *endp;
 129         int retval = 0;
 130
 131         down(&zfcp_data.config_sema);
 132
 133         port = dev_get_drvdata(dev);
 134         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
 135                 retval = -EBUSY;
 136                 goto out;
 137         }
 138
 139         fcp_lun = 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         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 147         if (unit && (atomic_read(&unit->refcount) == 0)) {
 148                 zfcp_unit_get(unit);
 149                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 150                 list_move(&unit->list, &port->unit_remove_lh);
 151         }
 152         else {
 153                 unit = NULL;
 154         }
 155         write_unlock_irq(&zfcp_data.config_lock);
 156
 157         if (!unit) {
 158                 retval = -ENXIO;
 159                 goto out;
 160         }
 161
 162         zfcp_erp_unit_shutdown(unit, 0);
 163         zfcp_erp_wait(unit->port->adapter);
 164         zfcp_unit_put(unit);
 165         zfcp_unit_dequeue(unit);
 166  out:
 167         up(&zfcp_data.config_sema);
 168         return retval ? retval : (ssize_t) count;
 169 }
 170
 171 static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
 172
 173 /**
 174  * zfcp_sysfs_port_failed_store - failed state of port
 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 a port.
 180  * If a "0" gets written to "failed", error recovery will be
 181  * started for the belonging port.
 182  */
 183 static ssize_t
 184 zfcp_sysfs_port_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 185 {
 186         struct zfcp_port *port;
 187         unsigned int val;
 188         char *endp;
 189         int retval = 0;
 190
 191         down(&zfcp_data.config_sema);
 192
 193         port = dev_get_drvdata(dev);
 194         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
 195                 retval = -EBUSY;
 196                 goto out;
 197         }
 198
 199         val = simple_strtoul(buf, &endp, 0);
 200         if (((endp + 1) < (buf + count)) || (val != 0)) {
 201                 retval = -EINVAL;
 202                 goto out;
 203         }
 204
 205         zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 206         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 207         zfcp_erp_wait(port->adapter);
 208  out:
 209         up(&zfcp_data.config_sema);
 210         return retval ? retval : (ssize_t) count;
 211 }
 212
 213 /**
 214  * zfcp_sysfs_port_failed_show - failed state of port
 215  * @dev: pointer to belonging device
 216  * @buf: pointer to input buffer
 217  *
 218  * Show function of "failed" attribute of port. Will be
 219  * "0" if port is working, otherwise "1".
 220  */
 221 static ssize_t
 222 zfcp_sysfs_port_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
 223 {
 224         struct zfcp_port *port;
 225
 226         port = dev_get_drvdata(dev);
 227         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->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_port_failed_show,
 234                    zfcp_sysfs_port_failed_store);
 235
 236 /**
 237  * zfcp_port_common_attrs
 238  * sysfs attributes that are common for all kind of fc ports.
 239  */
 240 static struct attribute *zfcp_port_common_attrs[] = {
 241         &dev_attr_failed.attr,
 242         &dev_attr_in_recovery.attr,
 243         &dev_attr_status.attr,
 244         &dev_attr_access_denied.attr,
 245         NULL
 246 };
 247
 248 static struct attribute_group zfcp_port_common_attr_group = {
 249         .attrs = zfcp_port_common_attrs,
 250 };
 251
 252 /**
 253  * zfcp_port_no_ns_attrs
 254  * sysfs attributes not to be used for nameserver ports.
 255  */
 256 static struct attribute *zfcp_port_no_ns_attrs[] = {
 257         &dev_attr_unit_add.attr,
 258         &dev_attr_unit_remove.attr,
 259         NULL
 260 };
 261
 262 static struct attribute_group zfcp_port_no_ns_attr_group = {
 263         .attrs = zfcp_port_no_ns_attrs,
 264 };
 265
 266 /**
 267  * zfcp_sysfs_port_create_files - create sysfs port files
 268  * @dev: pointer to belonging device
 269  *
 270  * Create all attributes of the sysfs representation of a port.
 271  */
 272 int
 273 zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
 274 {
 275         int retval;
 276
 277         retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
 278
 279         if ((flags & ZFCP_STATUS_PORT_WKA) || retval)
 280                 return retval;
 281
 282         retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
 283         if (retval)
 284                 sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
 285
 286         return retval;
 287 }
 288
 289 /**
 290  * zfcp_sysfs_port_remove_files - remove sysfs port files
 291  * @dev: pointer to belonging device
 292  *
 293  * Remove all attributes of the sysfs representation of a port.
 294  */
 295 void
 296 zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
 297 {
 298         sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
 299         if (!(flags & ZFCP_STATUS_PORT_WKA))
 300                 sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
 301 }
 302
 303 #undef ZFCP_LOG_AREA