[deliverable/linux.git] / include / scsi / scsi_transport.h

/* 
 *  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);
};

#define transport_class_to_shost(tc) \
	dev_to_shost((tc)->dev)


/* 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 */
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>
a9b73202	25	#include <scsi/scsi_device.h>
1da177e4 LT	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
5c44cd2a	33	/*
e02f3f59	34	* If set, called from sysfs and legacy procfs rescanning code.
5c44cd2a	35	*/
e02f3f59	36	int (user_scan)(struct Scsi_Host , uint, uint, uint);
5c44cd2a	37
1da177e4 LT	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;
c3e9dda4	42	int device_private_offset;
1da177e4	43	int target_size;
c3e9dda4	44	int target_private_offset;
1da177e4	45	int host_size;
c3e9dda4	46	/* no private offset for the host; there's an alternative mechanism */
1da177e4 LT	47
	48	/*
	49	* True if the transport wants to use a host-based work-queue
	50	*/
	51	unsigned int create_work_queue : 1;
c829c394	52
9227c33d CH	53	/*
	54	* Allows a transport to override the default error handler.
	55	*/
	56	void (* eh_strategy_handler)(struct Scsi_Host *);
	57
c829c394 JS	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 *);
2c47f9ef FT	68
	69	/*
	70	* Used as callback for the completion of i_t_nexus request
	71	* for target drivers.
	72	*/
	73	int (* it_nexus_response)(struct Scsi_Host *, u64, int);
1da177e4 LT	74	};
	75
	76	#define transport_class_to_shost(tc) \
	77	dev_to_shost((tc)->dev)
	78
	79
c3e9dda4 JB	80	/* Private area maintenance. The driver requested allocations come
	81	* directly after the transport class allocations (if any). The idea
	82	* is that you must call these only once. The code assumes that the
	83	* initial values are the ones the transport specific code requires */
	84	static inline void
	85	scsi_transport_reserve_target(struct scsi_transport_template * t, int space)
	86	{
	87	BUG_ON(t->target_private_offset != 0);
	88	t->target_private_offset = ALIGN(t->target_size, sizeof(void *));
	89	t->target_size = t->target_private_offset + space;
	90	}
	91	static inline void
	92	scsi_transport_reserve_device(struct scsi_transport_template * t, int space)
	93	{
	94	BUG_ON(t->device_private_offset != 0);
	95	t->device_private_offset = ALIGN(t->device_size, sizeof(void *));
	96	t->device_size = t->device_private_offset + space;
	97	}
	98	static inline void *
	99	scsi_transport_target_data(struct scsi_target *starget)
	100	{
	101	struct Scsi_Host *shost = dev_to_shost(&starget->dev);
	102	return (u8 *)starget->starget_data
	103	+ shost->transportt->target_private_offset;
	104
	105	}
	106	static inline void *
	107	scsi_transport_device_data(struct scsi_device *sdev)
	108	{
	109	struct Scsi_Host *shost = sdev->host;
	110	return (u8 *)sdev->sdev_data
	111	+ shost->transportt->device_private_offset;
	112	}
	113
1da177e4	114	#endif /* SCSI_TRANSPORT_H */