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