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,
35 SCSI_DH_DEV_UNSUPP, /* device handler not supported */
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_NOMEM,
56 SCSI_DH_NOSYS,
57 SCSI_DH_DRIVER_MAX,
58 };
59
60 typedef void (*activate_complete)(void *, int);
61 struct scsi_device_handler {
62 /* Used by the infrastructure */
63 struct list_head list; /* list of scsi_device_handlers */
64
65 /* Filled by the hardware handler */
66 struct module *module;
67 const char *name;
68 int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
69 int (*attach)(struct scsi_device *);
70 void (*detach)(struct scsi_device *);
71 int (*activate)(struct scsi_device *, activate_complete, void *);
72 int (*prep_fn)(struct scsi_device *, struct request *);
73 int (*set_params)(struct scsi_device *, const char *);
74 void (*rescan)(struct scsi_device *);
75 };
76
77 #ifdef CONFIG_SCSI_DH
78 extern int scsi_dh_activate(struct request_queue *, activate_complete, void *);
79 extern int scsi_dh_attach(struct request_queue *, const char *);
80 extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t);
81 extern int scsi_dh_set_params(struct request_queue *, const char *);
82 #else
scsi_dh_activate(struct request_queue * req,activate_complete fn,void * data)83 static inline int scsi_dh_activate(struct request_queue *req,
84 activate_complete fn, void *data)
85 {
86 fn(data, 0);
87 return 0;
88 }
scsi_dh_attach(struct request_queue * req,const char * name)89 static inline int scsi_dh_attach(struct request_queue *req, const char *name)
90 {
91 return SCSI_DH_NOSYS;
92 }
scsi_dh_attached_handler_name(struct request_queue * q,gfp_t gfp)93 static inline const char *scsi_dh_attached_handler_name(struct request_queue *q,
94 gfp_t gfp)
95 {
96 return NULL;
97 }
scsi_dh_set_params(struct request_queue * req,const char * params)98 static inline int scsi_dh_set_params(struct request_queue *req, const char *params)
99 {
100 return -SCSI_DH_NOSYS;
101 }
102 #endif
103