1/* SPDX-License-Identifier: GPL-2.0-only */
 2/* 
 3 *  Transport specific attributes.
 4 *
 5 *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
 6 */
 7#ifndef SCSI_TRANSPORT_H
 8#define SCSI_TRANSPORT_H
 9
10#include <linux/transport_class.h>
11#include <linux/blkdev.h>
12#include <linux/bug.h>
13#include <scsi/scsi_host.h>
14#include <scsi/scsi_device.h>
15
16struct scsi_transport_template {
17	/* the attribute containers */
18	struct transport_container host_attrs;
19	struct transport_container target_attrs;
20	struct transport_container device_attrs;
21
22	/*
23	 * If set, called from sysfs and legacy procfs rescanning code.
24	 */
25	int (*user_scan)(struct Scsi_Host *, uint, uint, u64);
26
27	/* The size of the specific transport attribute structure (a
28	 * space of this size will be left at the end of the
29	 * scsi_* structure */
30	int	device_size;
31	int	device_private_offset;
32	int	target_size;
33	int	target_private_offset;
34	int	host_size;
35	/* no private offset for the host; there's an alternative mechanism */
36
37	/*
38	 * True if the transport wants to use a host-based work-queue
39	 */
40	unsigned int create_work_queue : 1;
41
42	/*
43	 * Allows a transport to override the default error handler.
44	 */
45	void (* eh_strategy_handler)(struct Scsi_Host *);
46};
47
48#define transport_class_to_shost(tc) \
49	dev_to_shost((tc)->parent)
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 */
56static inline void
57scsi_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}
63static inline void
64scsi_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}
70static inline void *
71scsi_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}
78static inline void *
79scsi_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
86void scsi_init_limits(struct Scsi_Host *shost, struct queue_limits *lim);
87
88#endif /* SCSI_TRANSPORT_H */

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/* 
 3 *  Transport specific attributes.
 4 *
 5 *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
 6 */
 7#ifndef SCSI_TRANSPORT_H
 8#define SCSI_TRANSPORT_H
 9
10#include <linux/transport_class.h>
11#include <linux/blkdev.h>
12#include <linux/bug.h>
13#include <scsi/scsi_host.h>
14#include <scsi/scsi_device.h>
15
16struct scsi_transport_template {
17	/* the attribute containers */
18	struct transport_container host_attrs;
19	struct transport_container target_attrs;
20	struct transport_container device_attrs;
21
22	/*
23	 * If set, called from sysfs and legacy procfs rescanning code.
24	 */
25	int (*user_scan)(struct Scsi_Host *, uint, uint, u64);
26
27	/* The size of the specific transport attribute structure (a
28	 * space of this size will be left at the end of the
29	 * scsi_* structure */
30	int	device_size;
31	int	device_private_offset;
32	int	target_size;
33	int	target_private_offset;
34	int	host_size;
35	/* no private offset for the host; there's an alternative mechanism */
36
37	/*
38	 * True if the transport wants to use a host-based work-queue
39	 */
40	unsigned int create_work_queue : 1;
41
42	/*
43	 * Allows a transport to override the default error handler.
44	 */
45	void (* eh_strategy_handler)(struct Scsi_Host *);
46};
47
48#define transport_class_to_shost(tc) \
49	dev_to_shost((tc)->parent)
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 */
56static inline void
57scsi_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}
63static inline void
64scsi_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}
70static inline void *
71scsi_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}
78static inline void *
79scsi_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
86void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q);
87
88#endif /* SCSI_TRANSPORT_H */