1 /* 2 * Transport specific attributes. 3 * 4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 #ifndef SCSI_TRANSPORT_H 21 #define SCSI_TRANSPORT_H 22 23 #include <linux/transport_class.h> 24 #include <scsi/scsi_host.h> 25 #include <scsi/scsi_device.h> 26 27 struct scsi_transport_template { 28 /* the attribute containers */ 29 struct transport_container host_attrs; 30 struct transport_container target_attrs; 31 struct transport_container device_attrs; 32 33 /* 34 * If set, called from sysfs and legacy procfs rescanning code. 35 */ 36 int (*user_scan)(struct Scsi_Host *, uint, uint, uint); 37 38 /* The size of the specific transport attribute structure (a 39 * space of this size will be left at the end of the 40 * scsi_* structure */ 41 int device_size; 42 int device_private_offset; 43 int target_size; 44 int target_private_offset; 45 int host_size; 46 /* no private offset for the host; there's an alternative mechanism */ 47 48 /* 49 * True if the transport wants to use a host-based work-queue 50 */ 51 unsigned int create_work_queue : 1; 52 53 /* 54 * Allows a transport to override the default error handler. 55 */ 56 void (* eh_strategy_handler)(struct Scsi_Host *); 57 58 /* 59 * This is an optional routine that allows the transport to become 60 * involved when a scsi io timer fires. The return value tells the 61 * timer routine how to finish the io timeout handling: 62 * EH_HANDLED: I fixed the error, please complete the command 63 * EH_RESET_TIMER: I need more time, reset the timer and 64 * begin counting again 65 * EH_NOT_HANDLED Begin normal error recovery 66 */ 67 enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *); 68 }; 69 70 #define transport_class_to_shost(tc) \ 71 dev_to_shost((tc)->dev) 72 73 74 /* Private area maintenance. The driver requested allocations come 75 * directly after the transport class allocations (if any). The idea 76 * is that you *must* call these only once. The code assumes that the 77 * initial values are the ones the transport specific code requires */ 78 static inline void 79 scsi_transport_reserve_target(struct scsi_transport_template * t, int space) 80 { 81 BUG_ON(t->target_private_offset != 0); 82 t->target_private_offset = ALIGN(t->target_size, sizeof(void *)); 83 t->target_size = t->target_private_offset + space; 84 } 85 static inline void 86 scsi_transport_reserve_device(struct scsi_transport_template * t, int space) 87 { 88 BUG_ON(t->device_private_offset != 0); 89 t->device_private_offset = ALIGN(t->device_size, sizeof(void *)); 90 t->device_size = t->device_private_offset + space; 91 } 92 static inline void * 93 scsi_transport_target_data(struct scsi_target *starget) 94 { 95 struct Scsi_Host *shost = dev_to_shost(&starget->dev); 96 return (u8 *)starget->starget_data 97 + shost->transportt->target_private_offset; 98 99 } 100 static inline void * 101 scsi_transport_device_data(struct scsi_device *sdev) 102 { 103 struct Scsi_Host *shost = sdev->host; 104 return (u8 *)sdev->sdev_data 105 + shost->transportt->device_private_offset; 106 } 107 108 #endif /* SCSI_TRANSPORT_H */ 109