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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 */ |