drivers/scsi/scsi_transport_fc.c

   1 /*
   2  *  FiberChannel transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <scsi/scsi_device.h>
  23 #include <scsi/scsi_host.h>
  24 #include <scsi/scsi_transport.h>
  25 #include <scsi/scsi_transport_fc.h>
  26
  27 #define FC_PRINTK(x, l, f, a...)        printk(l "scsi(%d:%d:%d:%d): " f, (x)->host->host_no, (x)->channel, (x)->id, (x)->lun , ##a)
  28
  29 static void transport_class_release(struct class_device *class_dev);
  30
  31 #define FC_NUM_ATTRS    3       /* increase this if you add attributes */
  32 #define FC_OTHER_ATTRS  0       /* increase this if you add "always on"
  33                                  * attributes */
  34
  35 struct fc_internal {
  36         struct scsi_transport_template t;
  37         struct fc_function_template *f;
  38         /* The actual attributes */
  39         struct class_device_attribute private_attrs[FC_NUM_ATTRS];
  40         /* The array of null terminated pointers to attributes
  41          * needed by scsi_sysfs.c */
  42         struct class_device_attribute *attrs[FC_NUM_ATTRS + FC_OTHER_ATTRS + 1];
  43 };
  44
  45 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
  46
  47 struct class fc_transport_class = {
  48         .name = "fc_transport",
  49         .release = transport_class_release,
  50 };
  51
  52 static __init int fc_transport_init(void)
  53 {
  54         return class_register(&fc_transport_class);
  55 }
  56
  57 static void __exit fc_transport_exit(void)
  58 {
  59         class_unregister(&fc_transport_class);
  60 }
  61
  62 static int fc_setup_transport_attrs(struct scsi_device *sdev)
  63 {
  64         /* I'm not sure what values are invalid.  We should pick some invalid
  65          * values for the defaults */
  66         fc_node_name(sdev) = -1;
  67         fc_port_name(sdev) = -1;
  68         fc_port_id(sdev) = -1;
  69
  70         return 0;
  71 }
  72
  73 static void transport_class_release(struct class_device *class_dev)
  74 {
  75         struct scsi_device *sdev = transport_class_to_sdev(class_dev);
  76         put_device(&sdev->sdev_gendev);
  77 }
  78
  79 #define fc_transport_show_function(field, format_string, cast)          \
  80                                                                         \
  81 static ssize_t                                                          \
  82 show_fc_transport_##field (struct class_device *cdev, char *buf)        \
  83 {                                                                       \
  84         struct scsi_device *sdev = transport_class_to_sdev(cdev);       \
  85         struct fc_transport_attrs *tp;                                  \
  86         struct fc_internal *i = to_fc_internal(sdev->host->transportt); \
  87         tp = (struct fc_transport_attrs *)&sdev->transport_data;        \
  88         if (i->f->get_##field)                                          \
  89                 i->f->get_##field(sdev);                                \
  90         return snprintf(buf, 20, format_string, cast tp->field);        \
  91 }
  92
  93 #define fc_transport_store_function(field, format_string)               \
  94 static ssize_t                                                          \
  95 store_fc_transport_##field(struct class_device *cdev, const char *buf,  \
  96                            size_t count)                                \
  97 {                                                                       \
  98         int val;                                                        \
  99         struct scsi_device *sdev = transport_class_to_sdev(cdev);       \
 100         struct fc_internal *i = to_fc_internal(sdev->host->transportt); \
 101                                                                         \
 102         val = simple_strtoul(buf, NULL, 0);                             \
 103         i->f->set_##field(sdev, val);                                   \
 104         return count;                                                   \
 105 }
 106
 107 #define fc_transport_rd_attr(field, format_string)                      \
 108         fc_transport_show_function(field, format_string, )              \
 109 static CLASS_DEVICE_ATTR(field, S_IRUGO,                                \
 110                          show_fc_transport_##field, NULL)
 111
 112 #define fc_transport_rd_attr_cast(field, format_string, cast)           \
 113         fc_transport_show_function(field, format_string, (cast))        \
 114 static CLASS_DEVICE_ATTR( field, S_IRUGO,                               \
 115                           show_fc_transport_##field, NULL)
 116
 117 #define fc_transport_rw_attr(field, format_string)                      \
 118         fc_transport_show_function(field, format_string, )              \
 119         fc_transport_store_function(field, format_string)               \
 120 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 121                         show_fc_transport_##field,                      \
 122                         store_fc_transport_##field)
 123
 124 /* the FiberChannel Tranport Attributes: */
 125 fc_transport_rd_attr_cast(node_name, "0x%llx\n", unsigned long long);
 126 fc_transport_rd_attr_cast(port_name, "0x%llx\n", unsigned long long);
 127 fc_transport_rd_attr(port_id, "0x%06x\n");
 128
 129 #define SETUP_ATTRIBUTE_RD(field)                               \
 130         i->private_attrs[count] = class_device_attr_##field;    \
 131         i->private_attrs[count].attr.mode = S_IRUGO;            \
 132         i->private_attrs[count].store = NULL;                   \
 133         i->attrs[count] = &i->private_attrs[count];             \
 134         if (i->f->show_##field)                                 \
 135                 count++
 136
 137 #define SETUP_ATTRIBUTE_RW(field)                               \
 138         i->private_attrs[count] = class_device_attr_##field;    \
 139         if (!i->f->set_##field) {                               \
 140                 i->private_attrs[count].attr.mode = S_IRUGO;    \
 141                 i->private_attrs[count].store = NULL;           \
 142         }                                                       \
 143         i->attrs[count] = &i->private_attrs[count];             \
 144         if (i->f->show_##field)                                 \
 145                 count++
 146
 147 struct scsi_transport_template *
 148 fc_attach_transport(struct fc_function_template *ft)
 149 {
 150         struct fc_internal *i = kmalloc(sizeof(struct fc_internal),
 151                                         GFP_KERNEL);
 152         int count = 0;
 153
 154         if (unlikely(!i))
 155                 return NULL;
 156
 157         memset(i, 0, sizeof(struct fc_internal));
 158
 159         i->t.attrs = &i->attrs[0];
 160         i->t.class = &fc_transport_class;
 161         i->t.setup = &fc_setup_transport_attrs;
 162         i->t.size = sizeof(struct fc_transport_attrs);
 163         i->f = ft;
 164
 165         SETUP_ATTRIBUTE_RD(port_id);
 166         SETUP_ATTRIBUTE_RD(port_name);
 167         SETUP_ATTRIBUTE_RD(node_name);
 168
 169         BUG_ON(count > FC_NUM_ATTRS);
 170
 171         /* Setup the always-on attributes here */
 172
 173         i->attrs[count] = NULL;
 174
 175         return &i->t;
 176 }
 177 EXPORT_SYMBOL(fc_attach_transport);
 178
 179 void fc_release_transport(struct scsi_transport_template *t)
 180 {
 181         struct fc_internal *i = to_fc_internal(t);
 182
 183         kfree(i);
 184 }
 185 EXPORT_SYMBOL(fc_release_transport);
 186
 187
 188 MODULE_AUTHOR("Martin Hicks");
 189 MODULE_DESCRIPTION("FC Transport Attributes");
 190 MODULE_LICENSE("GPL");
 191
 192 module_init(fc_transport_init);
 193 module_exit(fc_transport_exit);