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 * Allows a transport to override the default error handler.
54 */
55 void (* eh_strategy_handler)(struct Scsi_Host *);
56
57 /*
58 * This is an optional routine that allows the transport to become
59 * involved when a scsi io timer fires. The return value tells the
60 * timer routine how to finish the io timeout handling:
61 * EH_HANDLED: I fixed the error, please complete the command
62 * EH_RESET_TIMER: I need more time, reset the timer and
63 * begin counting again
64 * EH_NOT_HANDLED Begin normal error recovery
65 */
66 enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
67};
68
69#define transport_class_to_shost(tc) \
70 dev_to_shost((tc)->dev)
71
72
73/* Private area maintenance. The driver requested allocations come
74 * directly after the transport class allocations (if any). The idea
75 * is that you *must* call these only once. The code assumes that the
76 * initial values are the ones the transport specific code requires */
77static inline void
78scsi_transport_reserve_target(struct scsi_transport_template * t, int space)
79{
80 BUG_ON(t->target_private_offset != 0);
81 t->target_private_offset = ALIGN(t->target_size, sizeof(void *));
82 t->target_size = t->target_private_offset + space;
83}
84static inline void
85scsi_transport_reserve_device(struct scsi_transport_template * t, int space)
86{
87 BUG_ON(t->device_private_offset != 0);
88 t->device_private_offset = ALIGN(t->device_size, sizeof(void *));
89 t->device_size = t->device_private_offset + space;
90}
91static inline void *
92scsi_transport_target_data(struct scsi_target *starget)
93{
94 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
95 return (u8 *)starget->starget_data
96 + shost->transportt->target_private_offset;
97
98}
99static inline void *
100scsi_transport_device_data(struct scsi_device *sdev)
101{
102 struct Scsi_Host *shost = sdev->host;
103 return (u8 *)sdev->sdev_data
104 + shost->transportt->device_private_offset;
105}
106
107#endif /* SCSI_TRANSPORT_H */