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1/* SPDX-License-Identifier: GPL-2.0-or-later */2/*3 * Header file for SCSI device handler infrastructure.4 *5 * Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu>6 *7 * Copyright IBM Corporation, 20078 * Authors:9 * Chandra Seetharaman <sekharan@us.ibm.com>10 * Mike Anderson <andmike@linux.vnet.ibm.com>11 */12 13#include <scsi/scsi_device.h>14 15enum {16 SCSI_DH_OK = 0,17 /*18 * device errors19 */20 SCSI_DH_DEV_FAILED, /* generic device error */21 SCSI_DH_DEV_TEMP_BUSY,22 SCSI_DH_DEV_UNSUPP, /* device handler not supported */23 SCSI_DH_DEVICE_MAX, /* max device blkerr definition */24 25 /*26 * transport errors27 */28 SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1,29 SCSI_DH_CONN_FAILURE,30 SCSI_DH_TRANSPORT_MAX, /* max transport blkerr definition */31 32 /*33 * driver and generic errors34 */35 SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1, /* generic error */36 SCSI_DH_INVALID_IO,37 SCSI_DH_RETRY, /* retry the req, but not immediately */38 SCSI_DH_IMM_RETRY, /* immediately retry the req */39 SCSI_DH_TIMED_OUT,40 SCSI_DH_RES_TEMP_UNAVAIL,41 SCSI_DH_DEV_OFFLINED,42 SCSI_DH_NOMEM,43 SCSI_DH_NOSYS,44 SCSI_DH_DRIVER_MAX,45};46 47typedef void (*activate_complete)(void *, int);48struct scsi_device_handler {49 /* Used by the infrastructure */50 struct list_head list; /* list of scsi_device_handlers */51 52 /* Filled by the hardware handler */53 struct module *module;54 const char *name;55 enum scsi_disposition (*check_sense)(struct scsi_device *,56 struct scsi_sense_hdr *);57 int (*attach)(struct scsi_device *);58 void (*detach)(struct scsi_device *);59 int (*activate)(struct scsi_device *, activate_complete, void *);60 blk_status_t (*prep_fn)(struct scsi_device *, struct request *);61 int (*set_params)(struct scsi_device *, const char *);62 void (*rescan)(struct scsi_device *);63};64 65#ifdef CONFIG_SCSI_DH66extern int scsi_dh_activate(struct request_queue *, activate_complete, void *);67extern int scsi_dh_attach(struct request_queue *, const char *);68extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t);69extern int scsi_dh_set_params(struct request_queue *, const char *);70#else71static inline int scsi_dh_activate(struct request_queue *req,72 activate_complete fn, void *data)73{74 fn(data, 0);75 return 0;76}77static inline int scsi_dh_attach(struct request_queue *req, const char *name)78{79 return SCSI_DH_NOSYS;80}81static inline const char *scsi_dh_attached_handler_name(struct request_queue *q,82 gfp_t gfp)83{84 return NULL;85}86static inline int scsi_dh_set_params(struct request_queue *req, const char *params)87{88 return -SCSI_DH_NOSYS;89}90#endif91