projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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> | |
| c3e9dda4 | 24 | #include <scsi/scsi_host.h> |
| 1da177e4 LT |
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; | |
| c3e9dda4 | 36 | int device_private_offset; |
| 1da177e4 | 37 | int target_size; |
| c3e9dda4 | 38 | int target_private_offset; |
| 1da177e4 | 39 | int host_size; |
| c3e9dda4 | 40 | /* no private offset for the host; there's an alternative mechanism */ |
| 1da177e4 LT |
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 | ||
| c3e9dda4 JB |
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 | ||
| 1da177e4 | 86 | #endif /* SCSI_TRANSPORT_H */ |