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 26 struct scsi_transport_template { 27 /* the attribute containers */ 28 struct transport_container host_attrs; 29 struct transport_container target_attrs; 30 struct transport_container device_attrs; 31 32 /* The size of the specific transport attribute structure (a 33 * space of this size will be left at the end of the 34 * scsi_* structure */ 35 int device_size; 36 int device_private_offset; 37 int target_size; 38 int target_private_offset; 39 int host_size; 40 /* no private offset for the host; there's an alternative mechanism */ 41 42 /* 43 * True if the transport wants to use a host-based work-queue 44 */ 45 unsigned int create_work_queue : 1; 46 }; 47 48 #define transport_class_to_shost(tc) \ 49 dev_to_shost((tc)->dev) 50 51 52 /* Private area maintenance. The driver requested allocations come 53 * directly after the transport class allocations (if any). The idea 54 * is that you *must* call these only once. The code assumes that the 55 * initial values are the ones the transport specific code requires */ 56 static inline void 57 scsi_transport_reserve_target(struct scsi_transport_template * t, int space) 58 { 59 BUG_ON(t->target_private_offset != 0); 60 t->target_private_offset = ALIGN(t->target_size, sizeof(void *)); 61 t->target_size = t->target_private_offset + space; 62 } 63 static inline void 64 scsi_transport_reserve_device(struct scsi_transport_template * t, int space) 65 { 66 BUG_ON(t->device_private_offset != 0); 67 t->device_private_offset = ALIGN(t->device_size, sizeof(void *)); 68 t->device_size = t->device_private_offset + space; 69 } 70 static inline void * 71 scsi_transport_target_data(struct scsi_target *starget) 72 { 73 struct Scsi_Host *shost = dev_to_shost(&starget->dev); 74 return (u8 *)starget->starget_data 75 + shost->transportt->target_private_offset; 76 77 } 78 static inline void * 79 scsi_transport_device_data(struct scsi_device *sdev) 80 { 81 struct Scsi_Host *shost = sdev->host; 82 return (u8 *)sdev->sdev_data 83 + shost->transportt->device_private_offset; 84 } 85 86 #endif /* SCSI_TRANSPORT_H */ 87