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 | |
29 | struct 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 */ |
69 | static inline void |
70 | scsi_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 | } |
76 | static inline void |
77 | scsi_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 | } |
83 | static inline void * |
84 | scsi_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 | } |
91 | static inline void * |
92 | scsi_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 | |
99 | void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q); |
100 | |
101 | #endif /* SCSI_TRANSPORT_H */ |
102 | |