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