drivers/s390/scsi/zfcp_sysfs_unit.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * sysfs interface for zfcp unit.
   5  *
   6  * Copyright IBM Corporation 2002, 2008
   7  */
   8
   9 #include "zfcp_ext.h"
  10
  11 /**
  12  * zfcp_sysfs_unit_release - gets called when a struct device unit is released
  13  * @dev: pointer to belonging device
  14  */
  15 void
  16 zfcp_sysfs_unit_release(struct device *dev)
  17 {
  18         kfree(dev);
  19 }
  20
  21 /**
  22  * ZFCP_DEFINE_UNIT_ATTR
  23  * @_name:   name of show attribute
  24  * @_format: format string
  25  * @_value:  value to print
  26  *
  27  * Generates attribute for a unit.
  28  */
  29 #define ZFCP_DEFINE_UNIT_ATTR(_name, _format, _value)                    \
  30 static ssize_t zfcp_sysfs_unit_##_name##_show(struct device *dev, struct device_attribute *attr,        \
  31                                               char *buf)                 \
  32 {                                                                        \
  33         struct zfcp_unit *unit;                                          \
  34                                                                          \
  35         unit = dev_get_drvdata(dev);                                     \
  36         return sprintf(buf, _format, _value);                            \
  37 }                                                                        \
  38                                                                          \
  39 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_unit_##_name##_show, NULL);
  40
  41 ZFCP_DEFINE_UNIT_ATTR(status, "0x%08x\n", atomic_read(&unit->status));
  42 ZFCP_DEFINE_UNIT_ATTR(in_recovery, "%d\n", atomic_test_mask
  43                       (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status));
  44 ZFCP_DEFINE_UNIT_ATTR(access_denied, "%d\n", atomic_test_mask
  45                       (ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status));
  46 ZFCP_DEFINE_UNIT_ATTR(access_shared, "%d\n", atomic_test_mask
  47                       (ZFCP_STATUS_UNIT_SHARED, &unit->status));
  48 ZFCP_DEFINE_UNIT_ATTR(access_readonly, "%d\n", atomic_test_mask
  49                       (ZFCP_STATUS_UNIT_READONLY, &unit->status));
  50
  51 /**
  52  * zfcp_sysfs_unit_failed_store - failed state of unit
  53  * @dev: pointer to belonging device
  54  * @buf: pointer to input buffer
  55  * @count: number of bytes in buffer
  56  *
  57  * Store function of the "failed" attribute of a unit.
  58  * If a "0" gets written to "failed", error recovery will be
  59  * started for the belonging unit.
  60  */
  61 static ssize_t
  62 zfcp_sysfs_unit_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  63 {
  64         struct zfcp_unit *unit;
  65         unsigned int val;
  66         char *endp;
  67         int retval = 0;
  68
  69         down(&zfcp_data.config_sema);
  70         unit = dev_get_drvdata(dev);
  71         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status)) {
  72                 retval = -EBUSY;
  73                 goto out;
  74         }
  75
  76         val = simple_strtoul(buf, &endp, 0);
  77         if (((endp + 1) < (buf + count)) || (val != 0)) {
  78                 retval = -EINVAL;
  79                 goto out;
  80         }
  81
  82         zfcp_erp_modify_unit_status(unit, 46, NULL,
  83                                     ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
  84         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, 97, NULL);
  85         zfcp_erp_wait(unit->port->adapter);
  86  out:
  87         up(&zfcp_data.config_sema);
  88         return retval ? retval : (ssize_t) count;
  89 }
  90
  91 /**
  92  * zfcp_sysfs_unit_failed_show - failed state of unit
  93  * @dev: pointer to belonging device
  94  * @buf: pointer to input buffer
  95  *
  96  * Show function of "failed" attribute of unit. Will be
  97  * "0" if unit is working, otherwise "1".
  98  */
  99 static ssize_t
 100 zfcp_sysfs_unit_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
 101 {
 102         struct zfcp_unit *unit;
 103
 104         unit = dev_get_drvdata(dev);
 105         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status))
 106                 return sprintf(buf, "1\n");
 107         else
 108                 return sprintf(buf, "0\n");
 109 }
 110
 111 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_unit_failed_show,
 112                    zfcp_sysfs_unit_failed_store);
 113
 114 static struct attribute *zfcp_unit_attrs[] = {
 115         &dev_attr_failed.attr,
 116         &dev_attr_in_recovery.attr,
 117         &dev_attr_status.attr,
 118         &dev_attr_access_denied.attr,
 119         &dev_attr_access_shared.attr,
 120         &dev_attr_access_readonly.attr,
 121         NULL
 122 };
 123
 124 static struct attribute_group zfcp_unit_attr_group = {
 125         .attrs = zfcp_unit_attrs,
 126 };
 127
 128 /**
 129  * zfcp_sysfs_create_unit_files - create sysfs unit files
 130  * @dev: pointer to belonging device
 131  *
 132  * Create all attributes of the sysfs representation of a unit.
 133  */
 134 int
 135 zfcp_sysfs_unit_create_files(struct device *dev)
 136 {
 137         return sysfs_create_group(&dev->kobj, &zfcp_unit_attr_group);
 138 }
 139
 140 /**
 141  * zfcp_sysfs_remove_unit_files - remove sysfs unit files
 142  * @dev: pointer to belonging device
 143  *
 144  * Remove all attributes of the sysfs representation of a unit.
 145  */
 146 void
 147 zfcp_sysfs_unit_remove_files(struct device *dev)
 148 {
 149         sysfs_remove_group(&dev->kobj, &zfcp_unit_attr_group);
 150 }