Commit | Line | Data |
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ba6d10ab | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
1da177e4 LT |
2 | /* |
3 | * Transport specific attributes. | |
4 | * | |
5 | * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved. | |
1da177e4 LT |
6 | */ |
7 | #ifndef SCSI_TRANSPORT_H | |
8 | #define SCSI_TRANSPORT_H | |
9 | ||
10 | #include <linux/transport_class.h> | |
242f9dcb | 11 | #include <linux/blkdev.h> |
187f1882 | 12 | #include <linux/bug.h> |
c3e9dda4 | 13 | #include <scsi/scsi_host.h> |
a9b73202 | 14 | #include <scsi/scsi_device.h> |
1da177e4 LT |
15 | |
16 | struct scsi_transport_template { | |
17 | /* the attribute containers */ | |
18 | struct transport_container host_attrs; | |
19 | struct transport_container target_attrs; | |
20 | struct transport_container device_attrs; | |
21 | ||
5c44cd2a | 22 | /* |
e02f3f59 | 23 | * If set, called from sysfs and legacy procfs rescanning code. |
5c44cd2a | 24 | */ |
9cb78c16 | 25 | int (*user_scan)(struct Scsi_Host *, uint, uint, u64); |
5c44cd2a | 26 | |
1da177e4 LT |
27 | /* The size of the specific transport attribute structure (a |
28 | * space of this size will be left at the end of the | |
29 | * scsi_* structure */ | |
30 | int device_size; | |
c3e9dda4 | 31 | int device_private_offset; |
1da177e4 | 32 | int target_size; |
c3e9dda4 | 33 | int target_private_offset; |
1da177e4 | 34 | int host_size; |
c3e9dda4 | 35 | /* no private offset for the host; there's an alternative mechanism */ |
1da177e4 LT |
36 | |
37 | /* | |
38 | * True if the transport wants to use a host-based work-queue | |
39 | */ | |
40 | unsigned int create_work_queue : 1; | |
c829c394 | 41 | |
9227c33d CH |
42 | /* |
43 | * Allows a transport to override the default error handler. | |
44 | */ | |
45 | void (* eh_strategy_handler)(struct Scsi_Host *); | |
1da177e4 LT |
46 | }; |
47 | ||
48 | #define transport_class_to_shost(tc) \ | |
ee959b00 | 49 | dev_to_shost((tc)->parent) |
1da177e4 LT |
50 | |
51 | ||
c3e9dda4 JB |
52 | /* Private area maintenance. The driver requested allocations come |
53 | * directly after the transport class allocations (if any). The idea | |
54 | * is that you *must* call these only once. The code assumes that the | |
55 | * initial values are the ones the transport specific code requires */ | |
56 | static inline void | |
57 | scsi_transport_reserve_target(struct scsi_transport_template * t, int space) | |
58 | { | |
59 | BUG_ON(t->target_private_offset != 0); | |
60 | t->target_private_offset = ALIGN(t->target_size, sizeof(void *)); | |
61 | t->target_size = t->target_private_offset + space; | |
62 | } | |
63 | static inline void | |
64 | scsi_transport_reserve_device(struct scsi_transport_template * t, int space) | |
65 | { | |
66 | BUG_ON(t->device_private_offset != 0); | |
67 | t->device_private_offset = ALIGN(t->device_size, sizeof(void *)); | |
68 | t->device_size = t->device_private_offset + space; | |
69 | } | |
70 | static inline void * | |
71 | scsi_transport_target_data(struct scsi_target *starget) | |
72 | { | |
73 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
74 | return (u8 *)starget->starget_data | |
75 | + shost->transportt->target_private_offset; | |
76 | ||
77 | } | |
78 | static inline void * | |
79 | scsi_transport_device_data(struct scsi_device *sdev) | |
80 | { | |
81 | struct Scsi_Host *shost = sdev->host; | |
82 | return (u8 *)sdev->sdev_data | |
83 | + shost->transportt->device_private_offset; | |
84 | } | |
85 | ||
d48777a6 CH |
86 | void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q); |
87 | ||
1da177e4 | 88 | #endif /* SCSI_TRANSPORT_H */ |