drivers/s390/scsi/zfcp_sysfs_port.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * sysfs attributes for zfcp port.
   5  *
   6  * Copyright IBM Corporation 2002, 2008
   7  */
   8
   9 #include "zfcp_ext.h"
  10
  11 /**
  12  * zfcp_sysfs_port_release - gets called when a struct device port is released
  13  * @dev: pointer to belonging device
  14  */
  15 void
  16 zfcp_sysfs_port_release(struct device *dev)
  17 {
  18         kfree(dev);
  19 }
  20
  21 /**
  22  * ZFCP_DEFINE_PORT_ATTR
  23  * @_name:   name of show attribute
  24  * @_format: format string
  25  * @_value:  value to print
  26  *
  27  * Generates attributes for a port.
  28  */
  29 #define ZFCP_DEFINE_PORT_ATTR(_name, _format, _value)                    \
  30 static ssize_t zfcp_sysfs_port_##_name##_show(struct device *dev, struct device_attribute *attr,        \
  31                                               char *buf)                 \
  32 {                                                                        \
  33         struct zfcp_port *port;                                          \
  34                                                                          \
  35         port = dev_get_drvdata(dev);                                     \
  36         return sprintf(buf, _format, _value);                            \
  37 }                                                                        \
  38                                                                          \
  39 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_port_##_name##_show, NULL);
  40
  41 ZFCP_DEFINE_PORT_ATTR(status, "0x%08x\n", atomic_read(&port->status));
  42 ZFCP_DEFINE_PORT_ATTR(in_recovery, "%d\n", atomic_test_mask
  43                       (ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
  44 ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
  45                       (ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
  46
  47 /**
  48  * zfcp_sysfs_unit_add_store - add a unit to sysfs tree
  49  * @dev: pointer to belonging device
  50  * @buf: pointer to input buffer
  51  * @count: number of bytes in buffer
  52  *
  53  * Store function of the "unit_add" attribute of a port.
  54  */
  55 static ssize_t
  56 zfcp_sysfs_unit_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  57 {
  58         fcp_lun_t fcp_lun;
  59         char *endp;
  60         struct zfcp_port *port;
  61         struct zfcp_unit *unit;
  62         int retval = -EINVAL;
  63
  64         down(&zfcp_data.config_sema);
  65
  66         port = dev_get_drvdata(dev);
  67         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
  68                 retval = -EBUSY;
  69                 goto out;
  70         }
  71
  72         fcp_lun = simple_strtoull(buf, &endp, 0);
  73         if ((endp + 1) < (buf + count))
  74                 goto out;
  75
  76         unit = zfcp_unit_enqueue(port, fcp_lun);
  77         if (!unit)
  78                 goto out;
  79
  80         retval = 0;
  81
  82         zfcp_erp_unit_reopen(unit, 0, 94, NULL);
  83         zfcp_erp_wait(unit->port->adapter);
  84         zfcp_unit_put(unit);
  85  out:
  86         up(&zfcp_data.config_sema);
  87         return retval ? retval : (ssize_t) count;
  88 }
  89
  90 static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
  91
  92 /**
  93  * zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
  94  * @dev: pointer to belonging device
  95  * @buf: pointer to input buffer
  96  * @count: number of bytes in buffer
  97  */
  98 static ssize_t
  99 zfcp_sysfs_unit_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 100 {
 101         struct zfcp_port *port;
 102         struct zfcp_unit *unit;
 103         fcp_lun_t fcp_lun;
 104         char *endp;
 105         int retval = 0;
 106
 107         down(&zfcp_data.config_sema);
 108
 109         port = dev_get_drvdata(dev);
 110         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
 111                 retval = -EBUSY;
 112                 goto out;
 113         }
 114
 115         fcp_lun = simple_strtoull(buf, &endp, 0);
 116         if ((endp + 1) < (buf + count)) {
 117                 retval = -EINVAL;
 118                 goto out;
 119         }
 120
 121         write_lock_irq(&zfcp_data.config_lock);
 122         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 123         if (unit && (atomic_read(&unit->refcount) == 0)) {
 124                 zfcp_unit_get(unit);
 125                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 126                 list_move(&unit->list, &port->unit_remove_lh);
 127         }
 128         else {
 129                 unit = NULL;
 130         }
 131         write_unlock_irq(&zfcp_data.config_lock);
 132
 133         if (!unit) {
 134                 retval = -ENXIO;
 135                 goto out;
 136         }
 137
 138         zfcp_erp_unit_shutdown(unit, 0, 95, NULL);
 139         zfcp_erp_wait(unit->port->adapter);
 140         zfcp_unit_put(unit);
 141         zfcp_unit_dequeue(unit);
 142  out:
 143         up(&zfcp_data.config_sema);
 144         return retval ? retval : (ssize_t) count;
 145 }
 146
 147 static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
 148
 149 /**
 150  * zfcp_sysfs_port_failed_store - failed state of port
 151  * @dev: pointer to belonging device
 152  * @buf: pointer to input buffer
 153  * @count: number of bytes in buffer
 154  *
 155  * Store function of the "failed" attribute of a port.
 156  * If a "0" gets written to "failed", error recovery will be
 157  * started for the belonging port.
 158  */
 159 static ssize_t
 160 zfcp_sysfs_port_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 161 {
 162         struct zfcp_port *port;
 163         unsigned int val;
 164         char *endp;
 165         int retval = 0;
 166
 167         down(&zfcp_data.config_sema);
 168
 169         port = dev_get_drvdata(dev);
 170         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
 171                 retval = -EBUSY;
 172                 goto out;
 173         }
 174
 175         val = simple_strtoul(buf, &endp, 0);
 176         if (((endp + 1) < (buf + count)) || (val != 0)) {
 177                 retval = -EINVAL;
 178                 goto out;
 179         }
 180
 181         zfcp_erp_modify_port_status(port, 45, NULL,
 182                                     ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 183         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 96, NULL);
 184         zfcp_erp_wait(port->adapter);
 185  out:
 186         up(&zfcp_data.config_sema);
 187         return retval ? retval : (ssize_t) count;
 188 }
 189
 190 /**
 191  * zfcp_sysfs_port_failed_show - failed state of port
 192  * @dev: pointer to belonging device
 193  * @buf: pointer to input buffer
 194  *
 195  * Show function of "failed" attribute of port. Will be
 196  * "0" if port is working, otherwise "1".
 197  */
 198 static ssize_t
 199 zfcp_sysfs_port_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
 200 {
 201         struct zfcp_port *port;
 202
 203         port = dev_get_drvdata(dev);
 204         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status))
 205                 return sprintf(buf, "1\n");
 206         else
 207                 return sprintf(buf, "0\n");
 208 }
 209
 210 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_port_failed_show,
 211                    zfcp_sysfs_port_failed_store);
 212
 213 /**
 214  * zfcp_port_common_attrs
 215  * sysfs attributes that are common for all kind of fc ports.
 216  */
 217 static struct attribute *zfcp_port_common_attrs[] = {
 218         &dev_attr_failed.attr,
 219         &dev_attr_in_recovery.attr,
 220         &dev_attr_status.attr,
 221         &dev_attr_access_denied.attr,
 222         NULL
 223 };
 224
 225 static struct attribute_group zfcp_port_common_attr_group = {
 226         .attrs = zfcp_port_common_attrs,
 227 };
 228
 229 /**
 230  * zfcp_port_no_ns_attrs
 231  * sysfs attributes not to be used for nameserver ports.
 232  */
 233 static struct attribute *zfcp_port_no_ns_attrs[] = {
 234         &dev_attr_unit_add.attr,
 235         &dev_attr_unit_remove.attr,
 236         NULL
 237 };
 238
 239 static struct attribute_group zfcp_port_no_ns_attr_group = {
 240         .attrs = zfcp_port_no_ns_attrs,
 241 };
 242
 243 /**
 244  * zfcp_sysfs_port_create_files - create sysfs port files
 245  * @dev: pointer to belonging device
 246  *
 247  * Create all attributes of the sysfs representation of a port.
 248  */
 249 int
 250 zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
 251 {
 252         int retval;
 253
 254         retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
 255
 256         if ((flags & ZFCP_STATUS_PORT_WKA) || retval)
 257                 return retval;
 258
 259         retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
 260         if (retval)
 261                 sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
 262
 263         return retval;
 264 }
 265
 266 /**
 267  * zfcp_sysfs_port_remove_files - remove sysfs port files
 268  * @dev: pointer to belonging device
 269  *
 270  * Remove all attributes of the sysfs representation of a port.
 271  */
 272 void
 273 zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
 274 {
 275         sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
 276         if (!(flags & ZFCP_STATUS_PORT_WKA))
 277                 sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
 278 }