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_NOSYS, 56 SCSI_DH_DRIVER_MAX, 57 }; 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 75 #ifdef CONFIG_SCSI_DH 76 extern int scsi_dh_activate(struct request_queue *, activate_complete, void *); 77 extern int scsi_dh_attach(struct request_queue *, const char *); 78 extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t); 79 extern int scsi_dh_set_params(struct request_queue *, const char *); 80 #else 81 static inline int scsi_dh_activate(struct request_queue *req, 82 activate_complete fn, void *data) 83 { 84 fn(data, 0); 85 return 0; 86 } 87 static inline int scsi_dh_attach(struct request_queue *req, const char *name) 88 { 89 return SCSI_DH_NOSYS; 90 } 91 static inline const char *scsi_dh_attached_handler_name(struct request_queue *q, 92 gfp_t gfp) 93 { 94 return NULL; 95 } 96 static inline int scsi_dh_set_params(struct request_queue *req, const char *params) 97 { 98 return -SCSI_DH_NOSYS; 99 } 100 #endif 101