Commit | Line | Data |
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a6a8d9f8 CS |
1 | /* |
2 | * Header file for SCSI device handler infrastruture. | |
3 | * | |
4 | * Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | * Copyright IBM Corporation, 2007 | |
21 | * Authors: | |
22 | * Chandra Seetharaman <sekharan@us.ibm.com> | |
23 | * Mike Anderson <andmike@linux.vnet.ibm.com> | |
24 | */ | |
25 | ||
26 | #include <scsi/scsi_device.h> | |
27 | ||
28 | enum { | |
29 | SCSI_DH_OK = 0, | |
30 | /* | |
31 | * device errors | |
32 | */ | |
33 | SCSI_DH_DEV_FAILED, /* generic device error */ | |
34 | SCSI_DH_DEV_TEMP_BUSY, | |
b6ff1b14 | 35 | SCSI_DH_DEV_UNSUPP, /* device handler not supported */ |
a6a8d9f8 CS |
36 | SCSI_DH_DEVICE_MAX, /* max device blkerr definition */ |
37 | ||
38 | /* | |
39 | * transport errors | |
40 | */ | |
41 | SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1, | |
42 | SCSI_DH_CONN_FAILURE, | |
43 | SCSI_DH_TRANSPORT_MAX, /* max transport blkerr definition */ | |
44 | ||
45 | /* | |
46 | * driver and generic errors | |
47 | */ | |
48 | SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1, /* generic error */ | |
49 | SCSI_DH_INVALID_IO, | |
50 | SCSI_DH_RETRY, /* retry the req, but not immediately */ | |
51 | SCSI_DH_IMM_RETRY, /* immediately retry the req */ | |
52 | SCSI_DH_TIMED_OUT, | |
53 | SCSI_DH_RES_TEMP_UNAVAIL, | |
54 | SCSI_DH_DEV_OFFLINED, | |
55 | SCSI_DH_NOSYS, | |
56 | SCSI_DH_DRIVER_MAX, | |
57 | }; | |
ee14c674 CH |
58 | |
59 | typedef void (*activate_complete)(void *, int); | |
60 | struct scsi_device_handler { | |
61 | /* Used by the infrastructure */ | |
62 | struct list_head list; /* list of scsi_device_handlers */ | |
63 | ||
64 | /* Filled by the hardware handler */ | |
65 | struct module *module; | |
66 | const char *name; | |
67 | int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *); | |
68 | int (*attach)(struct scsi_device *); | |
69 | void (*detach)(struct scsi_device *); | |
70 | int (*activate)(struct scsi_device *, activate_complete, void *); | |
71 | int (*prep_fn)(struct scsi_device *, struct request *); | |
72 | int (*set_params)(struct scsi_device *, const char *); | |
73 | }; | |
74 | ||
086b91d0 | 75 | #ifdef CONFIG_SCSI_DH |
3ae31f6a | 76 | extern int scsi_dh_activate(struct request_queue *, activate_complete, void *); |
ae11b1b3 | 77 | extern int scsi_dh_attach(struct request_queue *, const char *); |
7e8a74b1 | 78 | extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t); |
18ee70c9 | 79 | extern int scsi_dh_set_params(struct request_queue *, const char *); |
fe9233fb | 80 | #else |
3ae31f6a CS |
81 | static inline int scsi_dh_activate(struct request_queue *req, |
82 | activate_complete fn, void *data) | |
fe9233fb | 83 | { |
3ae31f6a | 84 | fn(data, 0); |
fe9233fb CS |
85 | return 0; |
86 | } | |
ae11b1b3 HR |
87 | static inline int scsi_dh_attach(struct request_queue *req, const char *name) |
88 | { | |
89 | return SCSI_DH_NOSYS; | |
90 | } | |
7e8a74b1 MS |
91 | static inline const char *scsi_dh_attached_handler_name(struct request_queue *q, |
92 | gfp_t gfp) | |
93 | { | |
94 | return NULL; | |
95 | } | |
18ee70c9 CS |
96 | static inline int scsi_dh_set_params(struct request_queue *req, const char *params) |
97 | { | |
98 | return -SCSI_DH_NOSYS; | |
99 | } | |
fe9233fb | 100 | #endif |