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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/include/scsi/scsi_transport.h
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/* SPDX-License-Identifier: GPL-2.0-only */

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/* 

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 *  Transport specific attributes.

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 *

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 *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.

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 */

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#ifndef SCSI_TRANSPORT_H

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#define SCSI_TRANSPORT_H

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#include <linux/transport_class.h>

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#include <linux/blkdev.h>

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#include <linux/bug.h>

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#include <scsi/scsi_host.h>

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#include <scsi/scsi_device.h>

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struct scsi_transport_template {

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	/* the attribute containers */

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	struct transport_container host_attrs;

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	struct transport_container target_attrs;

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	struct transport_container device_attrs;

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	/*

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	 * If set, called from sysfs and legacy procfs rescanning code.

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	 */

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	int (*user_scan)(struct Scsi_Host *, uint, uint, u64);

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	/* The size of the specific transport attribute structure (a

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	 * space of this size will be left at the end of the

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	 * scsi_* structure */

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	int	device_size;

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	int	device_private_offset;

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	int	target_size;

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	int	target_private_offset;

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	int	host_size;

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	/* no private offset for the host; there's an alternative mechanism */

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	/*

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	 * True if the transport wants to use a host-based work-queue

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	 */

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	unsigned int create_work_queue : 1;

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	/*

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	 * Allows a transport to override the default error handler.

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	 */

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	void (* eh_strategy_handler)(struct Scsi_Host *);

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};

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#define transport_class_to_shost(tc) \

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	dev_to_shost((tc)->parent)

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/* Private area maintenance. The driver requested allocations come

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 * directly after the transport class allocations (if any).  The idea

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 * is that you *must* call these only once.  The code assumes that the

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 * initial values are the ones the transport specific code requires */

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static inline void

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scsi_transport_reserve_target(struct scsi_transport_template * t, int space)

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{

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	BUG_ON(t->target_private_offset != 0);

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	t->target_private_offset = ALIGN(t->target_size, sizeof(void *));

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	t->target_size = t->target_private_offset + space;

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}

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static inline void

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scsi_transport_reserve_device(struct scsi_transport_template * t, int space)

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{

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	BUG_ON(t->device_private_offset != 0);

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	t->device_private_offset = ALIGN(t->device_size, sizeof(void *));

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	t->device_size = t->device_private_offset + space;

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}

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static inline void *

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scsi_transport_target_data(struct scsi_target *starget)

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{

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	struct Scsi_Host *shost = dev_to_shost(&starget->dev);

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	return (u8 *)starget->starget_data

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		+ shost->transportt->target_private_offset;

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}

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static inline void *

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scsi_transport_device_data(struct scsi_device *sdev)

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{

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	struct Scsi_Host *shost = sdev->host;

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	return (u8 *)sdev->sdev_data

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		+ shost->transportt->device_private_offset;

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}

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void scsi_init_limits(struct Scsi_Host *shost, struct queue_limits *lim);

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#endif /* SCSI_TRANSPORT_H */

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