freebsd/sys/cam/cam_xpt.h

/*-
 * Data structures and definitions for dealing with the 
 * Common Access Method Transport (xpt) layer.
 *
 * Copyright (c) 1997 Justin T. Gibbs.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification, immediately at the beginning of the file.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#ifndef _CAM_CAM_XPT_H
#define _CAM_CAM_XPT_H 1

/* Forward Declarations */
union ccb;
struct cam_periph;
struct cam_sim;

/*
 * Definition of a CAM path.  Paths are created from bus, target, and lun ids
 * via xpt_create_path and allow for reference to devices without recurring
 * lookups in the edt.
 */
struct cam_path;

/* Path functions */

#ifdef _KERNEL

/*
 * Definition of an async handler callback block.  These are used to add
 * SIMs and peripherals to the async callback lists.
 */
struct async_node {
	SLIST_ENTRY(async_node)	links;
	u_int32_t	event_enable;	/* Async Event enables */
	void		(*callback)(void *arg, u_int32_t code,
				    struct cam_path *path, void *args);
	void		*callback_arg;
};

SLIST_HEAD(async_list, async_node);
SLIST_HEAD(periph_list, cam_periph);

#if defined(CAM_DEBUG_FLAGS) && !defined(CAMDEBUG)
#error "You must have options CAMDEBUG to use options CAM_DEBUG_FLAGS"
#endif

/*
 * In order to enable the CAM_DEBUG_* options, the user must have CAMDEBUG
 * enabled.  Also, the user must have either none, or all of CAM_DEBUG_BUS,
 * CAM_DEBUG_TARGET, and CAM_DEBUG_LUN specified.
 */
#if defined(CAM_DEBUG_BUS) || defined(CAM_DEBUG_TARGET) \
    || defined(CAM_DEBUG_LUN)
#ifdef CAMDEBUG
#if !defined(CAM_DEBUG_BUS) || !defined(CAM_DEBUG_TARGET) \
    || !defined(CAM_DEBUG_LUN)
#error "You must define all or none of CAM_DEBUG_BUS, CAM_DEBUG_TARGET \
        and CAM_DEBUG_LUN"
#endif /* !CAM_DEBUG_BUS || !CAM_DEBUG_TARGET || !CAM_DEBUG_LUN */
#else /* !CAMDEBUG */
#error "You must use options CAMDEBUG if you use the CAM_DEBUG_* options"
#endif /* CAMDEBUG */
#endif /* CAM_DEBUG_BUS || CAM_DEBUG_TARGET || CAM_DEBUG_LUN */

void			xpt_action(union ccb *new_ccb);
void			xpt_action_default(union ccb *new_ccb);
union ccb		*xpt_alloc_ccb(void);
union ccb		*xpt_alloc_ccb_nowait(void);
void			xpt_free_ccb(union ccb *free_ccb);
void			xpt_setup_ccb(struct ccb_hdr *ccb_h,
				      struct cam_path *path,
				      u_int32_t priority);
void			xpt_merge_ccb(union ccb *master_ccb,
				      union ccb *slave_ccb);
cam_status		xpt_create_path(struct cam_path **new_path_ptr,
					struct cam_periph *perph,
					path_id_t path_id,
					target_id_t target_id, lun_id_t lun_id);
cam_status		xpt_create_path_unlocked(struct cam_path **new_path_ptr,
					struct cam_periph *perph,
					path_id_t path_id,
					target_id_t target_id, lun_id_t lun_id);
int			xpt_getattr(char *buf, size_t len, const char *attr,
				    struct cam_path *path);
void			xpt_free_path(struct cam_path *path);
void			xpt_path_counts(struct cam_path *path, uint32_t *bus_ref,
					uint32_t *periph_ref, uint32_t *target_ref,
					uint32_t *device_ref);
int			xpt_path_comp(struct cam_path *path1,
				      struct cam_path *path2);
void			xpt_print_path(struct cam_path *path);
void			xpt_print(struct cam_path *path, const char *fmt, ...);
int			xpt_path_string(struct cam_path *path, char *str,
					size_t str_len);
path_id_t		xpt_path_path_id(struct cam_path *path);
target_id_t		xpt_path_target_id(struct cam_path *path);
lun_id_t		xpt_path_lun_id(struct cam_path *path);
int			xpt_path_legacy_ata_id(struct cam_path *path);
struct cam_sim		*xpt_path_sim(struct cam_path *path);
struct cam_periph	*xpt_path_periph(struct cam_path *path);
void			xpt_async(u_int32_t async_code, struct cam_path *path,
				  void *async_arg);
void			xpt_rescan(union ccb *ccb);
void			xpt_hold_boot(void);
void			xpt_release_boot(void);
void			xpt_lock_buses(void);
void			xpt_unlock_buses(void);
cam_status		xpt_register_async(int event, ac_callback_t *cbfunc,
					   void *cbarg, struct cam_path *path);
cam_status		xpt_compile_path(struct cam_path *new_path,
					 struct cam_periph *perph,
					 path_id_t path_id,
					 target_id_t target_id,
					 lun_id_t lun_id);

void			xpt_release_path(struct cam_path *path);

#endif /* _KERNEL */

#endif /* _CAM_CAM_XPT_H */