91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Header file for SCSI device handler infrastructure.
|
|
*
|
|
* Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu>
|
|
*
|
|
* Copyright IBM Corporation, 2007
|
|
* Authors:
|
|
* Chandra Seetharaman <sekharan@us.ibm.com>
|
|
* Mike Anderson <andmike@linux.vnet.ibm.com>
|
|
*/
|
|
|
|
#include <scsi/scsi_device.h>
|
|
|
|
enum {
|
|
SCSI_DH_OK = 0,
|
|
/*
|
|
* device errors
|
|
*/
|
|
SCSI_DH_DEV_FAILED, /* generic device error */
|
|
SCSI_DH_DEV_TEMP_BUSY,
|
|
SCSI_DH_DEV_UNSUPP, /* device handler not supported */
|
|
SCSI_DH_DEVICE_MAX, /* max device blkerr definition */
|
|
|
|
/*
|
|
* transport errors
|
|
*/
|
|
SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1,
|
|
SCSI_DH_CONN_FAILURE,
|
|
SCSI_DH_TRANSPORT_MAX, /* max transport blkerr definition */
|
|
|
|
/*
|
|
* driver and generic errors
|
|
*/
|
|
SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1, /* generic error */
|
|
SCSI_DH_INVALID_IO,
|
|
SCSI_DH_RETRY, /* retry the req, but not immediately */
|
|
SCSI_DH_IMM_RETRY, /* immediately retry the req */
|
|
SCSI_DH_TIMED_OUT,
|
|
SCSI_DH_RES_TEMP_UNAVAIL,
|
|
SCSI_DH_DEV_OFFLINED,
|
|
SCSI_DH_NOMEM,
|
|
SCSI_DH_NOSYS,
|
|
SCSI_DH_DRIVER_MAX,
|
|
};
|
|
|
|
typedef void (*activate_complete)(void *, int);
|
|
struct scsi_device_handler {
|
|
/* Used by the infrastructure */
|
|
struct list_head list; /* list of scsi_device_handlers */
|
|
|
|
/* Filled by the hardware handler */
|
|
struct module *module;
|
|
const char *name;
|
|
enum scsi_disposition (*check_sense)(struct scsi_device *,
|
|
struct scsi_sense_hdr *);
|
|
int (*attach)(struct scsi_device *);
|
|
void (*detach)(struct scsi_device *);
|
|
int (*activate)(struct scsi_device *, activate_complete, void *);
|
|
blk_status_t (*prep_fn)(struct scsi_device *, struct request *);
|
|
int (*set_params)(struct scsi_device *, const char *);
|
|
void (*rescan)(struct scsi_device *);
|
|
};
|
|
|
|
#ifdef CONFIG_SCSI_DH
|
|
extern int scsi_dh_activate(struct request_queue *, activate_complete, void *);
|
|
extern int scsi_dh_attach(struct request_queue *, const char *);
|
|
extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t);
|
|
extern int scsi_dh_set_params(struct request_queue *, const char *);
|
|
#else
|
|
static inline int scsi_dh_activate(struct request_queue *req,
|
|
activate_complete fn, void *data)
|
|
{
|
|
fn(data, 0);
|
|
return 0;
|
|
}
|
|
static inline int scsi_dh_attach(struct request_queue *req, const char *name)
|
|
{
|
|
return SCSI_DH_NOSYS;
|
|
}
|
|
static inline const char *scsi_dh_attached_handler_name(struct request_queue *q,
|
|
gfp_t gfp)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline int scsi_dh_set_params(struct request_queue *req, const char *params)
|
|
{
|
|
return -SCSI_DH_NOSYS;
|
|
}
|
|
#endif
|