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1da177e4 LT |
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> | |
242f9dcb | 24 | #include <linux/blkdev.h> |
c3e9dda4 | 25 | #include <scsi/scsi_host.h> |
a9b73202 | 26 | #include <scsi/scsi_device.h> |
1da177e4 LT |
27 | |
28 | struct scsi_transport_template { | |
29 | /* the attribute containers */ | |
30 | struct transport_container host_attrs; | |
31 | struct transport_container target_attrs; | |
32 | struct transport_container device_attrs; | |
33 | ||
5c44cd2a | 34 | /* |
e02f3f59 | 35 | * If set, called from sysfs and legacy procfs rescanning code. |
5c44cd2a | 36 | */ |
e02f3f59 | 37 | int (*user_scan)(struct Scsi_Host *, uint, uint, uint); |
5c44cd2a | 38 | |
1da177e4 LT |
39 | /* The size of the specific transport attribute structure (a |
40 | * space of this size will be left at the end of the | |
41 | * scsi_* structure */ | |
42 | int device_size; | |
c3e9dda4 | 43 | int device_private_offset; |
1da177e4 | 44 | int target_size; |
c3e9dda4 | 45 | int target_private_offset; |
1da177e4 | 46 | int host_size; |
c3e9dda4 | 47 | /* no private offset for the host; there's an alternative mechanism */ |
1da177e4 LT |
48 | |
49 | /* | |
50 | * True if the transport wants to use a host-based work-queue | |
51 | */ | |
52 | unsigned int create_work_queue : 1; | |
c829c394 | 53 | |
9227c33d CH |
54 | /* |
55 | * Allows a transport to override the default error handler. | |
56 | */ | |
57 | void (* eh_strategy_handler)(struct Scsi_Host *); | |
58 | ||
c829c394 JS |
59 | /* |
60 | * This is an optional routine that allows the transport to become | |
61 | * involved when a scsi io timer fires. The return value tells the | |
62 | * timer routine how to finish the io timeout handling: | |
63 | * EH_HANDLED: I fixed the error, please complete the command | |
64 | * EH_RESET_TIMER: I need more time, reset the timer and | |
65 | * begin counting again | |
66 | * EH_NOT_HANDLED Begin normal error recovery | |
67 | */ | |
242f9dcb | 68 | enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *); |
2c47f9ef FT |
69 | |
70 | /* | |
71 | * Used as callback for the completion of i_t_nexus request | |
72 | * for target drivers. | |
73 | */ | |
74 | int (* it_nexus_response)(struct Scsi_Host *, u64, int); | |
bfb74374 FT |
75 | |
76 | /* | |
77 | * Used as callback for the completion of task management | |
78 | * request for target drivers. | |
79 | */ | |
80 | int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int); | |
1da177e4 LT |
81 | }; |
82 | ||
83 | #define transport_class_to_shost(tc) \ | |
ee959b00 | 84 | dev_to_shost((tc)->parent) |
1da177e4 LT |
85 | |
86 | ||
c3e9dda4 JB |
87 | /* Private area maintenance. The driver requested allocations come |
88 | * directly after the transport class allocations (if any). The idea | |
89 | * is that you *must* call these only once. The code assumes that the | |
90 | * initial values are the ones the transport specific code requires */ | |
91 | static inline void | |
92 | scsi_transport_reserve_target(struct scsi_transport_template * t, int space) | |
93 | { | |
94 | BUG_ON(t->target_private_offset != 0); | |
95 | t->target_private_offset = ALIGN(t->target_size, sizeof(void *)); | |
96 | t->target_size = t->target_private_offset + space; | |
97 | } | |
98 | static inline void | |
99 | scsi_transport_reserve_device(struct scsi_transport_template * t, int space) | |
100 | { | |
101 | BUG_ON(t->device_private_offset != 0); | |
102 | t->device_private_offset = ALIGN(t->device_size, sizeof(void *)); | |
103 | t->device_size = t->device_private_offset + space; | |
104 | } | |
105 | static inline void * | |
106 | scsi_transport_target_data(struct scsi_target *starget) | |
107 | { | |
108 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
109 | return (u8 *)starget->starget_data | |
110 | + shost->transportt->target_private_offset; | |
111 | ||
112 | } | |
113 | static inline void * | |
114 | scsi_transport_device_data(struct scsi_device *sdev) | |
115 | { | |
116 | struct Scsi_Host *shost = sdev->host; | |
117 | return (u8 *)sdev->sdev_data | |
118 | + shost->transportt->device_private_offset; | |
119 | } | |
120 | ||
1da177e4 | 121 | #endif /* SCSI_TRANSPORT_H */ |