121 lines
3.9 KiB
C
121 lines
3.9 KiB
C
/*
|
|
* Transport specific attributes.
|
|
*
|
|
* Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#ifndef SCSI_TRANSPORT_H
|
|
#define SCSI_TRANSPORT_H
|
|
|
|
#include <linux/transport_class.h>
|
|
#include <scsi/scsi_host.h>
|
|
#include <scsi/scsi_device.h>
|
|
|
|
struct scsi_transport_template {
|
|
/* the attribute containers */
|
|
struct transport_container host_attrs;
|
|
struct transport_container target_attrs;
|
|
struct transport_container device_attrs;
|
|
|
|
/*
|
|
* If set, called from sysfs and legacy procfs rescanning code.
|
|
*/
|
|
int (*user_scan)(struct Scsi_Host *, uint, uint, uint);
|
|
|
|
/* The size of the specific transport attribute structure (a
|
|
* space of this size will be left at the end of the
|
|
* scsi_* structure */
|
|
int device_size;
|
|
int device_private_offset;
|
|
int target_size;
|
|
int target_private_offset;
|
|
int host_size;
|
|
/* no private offset for the host; there's an alternative mechanism */
|
|
|
|
/*
|
|
* True if the transport wants to use a host-based work-queue
|
|
*/
|
|
unsigned int create_work_queue : 1;
|
|
|
|
/*
|
|
* Allows a transport to override the default error handler.
|
|
*/
|
|
void (* eh_strategy_handler)(struct Scsi_Host *);
|
|
|
|
/*
|
|
* This is an optional routine that allows the transport to become
|
|
* involved when a scsi io timer fires. The return value tells the
|
|
* timer routine how to finish the io timeout handling:
|
|
* EH_HANDLED: I fixed the error, please complete the command
|
|
* EH_RESET_TIMER: I need more time, reset the timer and
|
|
* begin counting again
|
|
* EH_NOT_HANDLED Begin normal error recovery
|
|
*/
|
|
enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
|
|
|
|
/*
|
|
* Used as callback for the completion of i_t_nexus request
|
|
* for target drivers.
|
|
*/
|
|
int (* it_nexus_response)(struct Scsi_Host *, u64, int);
|
|
|
|
/*
|
|
* Used as callback for the completion of task management
|
|
* request for target drivers.
|
|
*/
|
|
int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int);
|
|
};
|
|
|
|
#define transport_class_to_shost(tc) \
|
|
dev_to_shost((tc)->parent)
|
|
|
|
|
|
/* Private area maintenance. The driver requested allocations come
|
|
* directly after the transport class allocations (if any). The idea
|
|
* is that you *must* call these only once. The code assumes that the
|
|
* initial values are the ones the transport specific code requires */
|
|
static inline void
|
|
scsi_transport_reserve_target(struct scsi_transport_template * t, int space)
|
|
{
|
|
BUG_ON(t->target_private_offset != 0);
|
|
t->target_private_offset = ALIGN(t->target_size, sizeof(void *));
|
|
t->target_size = t->target_private_offset + space;
|
|
}
|
|
static inline void
|
|
scsi_transport_reserve_device(struct scsi_transport_template * t, int space)
|
|
{
|
|
BUG_ON(t->device_private_offset != 0);
|
|
t->device_private_offset = ALIGN(t->device_size, sizeof(void *));
|
|
t->device_size = t->device_private_offset + space;
|
|
}
|
|
static inline void *
|
|
scsi_transport_target_data(struct scsi_target *starget)
|
|
{
|
|
struct Scsi_Host *shost = dev_to_shost(&starget->dev);
|
|
return (u8 *)starget->starget_data
|
|
+ shost->transportt->target_private_offset;
|
|
|
|
}
|
|
static inline void *
|
|
scsi_transport_device_data(struct scsi_device *sdev)
|
|
{
|
|
struct Scsi_Host *shost = sdev->host;
|
|
return (u8 *)sdev->sdev_data
|
|
+ shost->transportt->device_private_offset;
|
|
}
|
|
|
|
#endif /* SCSI_TRANSPORT_H */
|