projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1a59d1b8 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| a6a8d9f8 CS |
2 | /* |
| 3 | * Header file for SCSI device handler infrastruture. | |
| 4 | * | |
| 5 | * Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu> | |
| 6 | * | |
| a6a8d9f8 CS |
7 | * Copyright IBM Corporation, 2007 |
| 8 | * 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 | ||
| 15 | enum { | |
| 16 | SCSI_DH_OK = 0, | |
| 17 | /* | |
| 18 | * device errors | |
| 19 | */ | |
| 20 | SCSI_DH_DEV_FAILED, /* generic device error */ | |
| 21 | SCSI_DH_DEV_TEMP_BUSY, | |
| b6ff1b14 | 22 | SCSI_DH_DEV_UNSUPP, /* device handler not supported */ |
| a6a8d9f8 CS |
23 | SCSI_DH_DEVICE_MAX, /* max device blkerr definition */ |
| 24 | ||
| 25 | /* | |
| 26 | * transport errors | |
| 27 | */ | |
| 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 errors | |
| 34 | */ | |
| 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, | |
| 43394c67 | 42 | SCSI_DH_NOMEM, |
| a6a8d9f8 CS |
43 | SCSI_DH_NOSYS, |
| 44 | SCSI_DH_DRIVER_MAX, | |
| 45 | }; | |
| ee14c674 CH |
46 | |
| 47 | typedef void (*activate_complete)(void *, int); | |
| 48 | struct 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 | int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *); | |
| 56 | int (*attach)(struct scsi_device *); | |
| 57 | void (*detach)(struct scsi_device *); | |
| 58 | int (*activate)(struct scsi_device *, activate_complete, void *); | |
| 4c1cb67c | 59 | blk_status_t (*prep_fn)(struct scsi_device *, struct request *); |
| ee14c674 | 60 | int (*set_params)(struct scsi_device *, const char *); |
| d3d32891 | 61 | void (*rescan)(struct scsi_device *); |
| ee14c674 CH |
62 | }; |
| 63 | ||
| 086b91d0 | 64 | #ifdef CONFIG_SCSI_DH |
| 3ae31f6a | 65 | extern int scsi_dh_activate(struct request_queue *, activate_complete, void *); |
| ae11b1b3 | 66 | extern int scsi_dh_attach(struct request_queue *, const char *); |
| 7e8a74b1 | 67 | extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t); |
| 18ee70c9 | 68 | extern int scsi_dh_set_params(struct request_queue *, const char *); |
| fe9233fb | 69 | #else |
| 3ae31f6a CS |
70 | static inline int scsi_dh_activate(struct request_queue *req, |
| 71 | activate_complete fn, void *data) | |
| fe9233fb | 72 | { |
| 3ae31f6a | 73 | fn(data, 0); |
| fe9233fb CS |
74 | return 0; |
| 75 | } | |
| ae11b1b3 HR |
76 | static inline int scsi_dh_attach(struct request_queue *req, const char *name) |
| 77 | { | |
| 78 | return SCSI_DH_NOSYS; | |
| 79 | } | |
| 7e8a74b1 MS |
80 | static inline const char *scsi_dh_attached_handler_name(struct request_queue *q, |
| 81 | gfp_t gfp) | |
| 82 | { | |
| 83 | return NULL; | |
| 84 | } | |
| 18ee70c9 CS |
85 | static inline int scsi_dh_set_params(struct request_queue *req, const char *params) |
| 86 | { | |
| 87 | return -SCSI_DH_NOSYS; | |
| 88 | } | |
| fe9233fb | 89 | #endif |