1/*
2 * Transport specific attributes.
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#ifndef SCSI_TRANSPORT_H
21#define SCSI_TRANSPORT_H
22
23#include <linux/transport_class.h>
24#include <linux/blkdev.h>
25#include <linux/bug.h>
26#include <scsi/scsi_host.h>
27#include <scsi/scsi_device.h>
28
29struct scsi_transport_template {
30 /* the attribute containers */
31 struct transport_container host_attrs;
32 struct transport_container target_attrs;
33 struct transport_container device_attrs;
34
35 /*
36 * If set, called from sysfs and legacy procfs rescanning code.
37 */
38 int (*user_scan)(struct Scsi_Host *, uint, uint, u64);
39
40 /* The size of the specific transport attribute structure (a
41 * space of this size will be left at the end of the
42 * scsi_* structure */
43 int device_size;
44 int device_private_offset;
45 int target_size;
46 int target_private_offset;
47 int host_size;
48 /* no private offset for the host; there's an alternative mechanism */
49
50 /*
51 * True if the transport wants to use a host-based work-queue
52 */
53 unsigned int create_work_queue : 1;
54
55 /*
56 * Allows a transport to override the default error handler.
57 */
58 void (* eh_strategy_handler)(struct Scsi_Host *);
59};
60
61#define transport_class_to_shost(tc) \
62 dev_to_shost((tc)->parent)
63
64
65/* Private area maintenance. The driver requested allocations come
66 * directly after the transport class allocations (if any). The idea
67 * is that you *must* call these only once. The code assumes that the
68 * initial values are the ones the transport specific code requires */
69static inline void
70scsi_transport_reserve_target(struct scsi_transport_template * t, int space)
71{
72 BUG_ON(t->target_private_offset != 0);
73 t->target_private_offset = ALIGN(t->target_size, sizeof(void *));
74 t->target_size = t->target_private_offset + space;
75}
76static inline void
77scsi_transport_reserve_device(struct scsi_transport_template * t, int space)
78{
79 BUG_ON(t->device_private_offset != 0);
80 t->device_private_offset = ALIGN(t->device_size, sizeof(void *));
81 t->device_size = t->device_private_offset + space;
82}
83static inline void *
84scsi_transport_target_data(struct scsi_target *starget)
85{
86 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
87 return (u8 *)starget->starget_data
88 + shost->transportt->target_private_offset;
89
90}
91static inline void *
92scsi_transport_device_data(struct scsi_device *sdev)
93{
94 struct Scsi_Host *shost = sdev->host;
95 return (u8 *)sdev->sdev_data
96 + shost->transportt->device_private_offset;
97}
98
99void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q);
100
101#endif /* SCSI_TRANSPORT_H */
102