1/*	$NetBSD: iostat.h,v 1.12 2019/05/22 08:47:02 hannken Exp $	*/
  2
  3/*-
  4 * Copyright (c) 1996, 1997, 2004, 2009 The NetBSD Foundation, Inc.
  5 * All rights reserved.
  6 *
  7 * This code is derived from software contributed to The NetBSD Foundation
  8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
  9 * NASA Ames Research Center.
 10 *
 11 * Redistribution and use in source and binary forms, with or without
 12 * modification, are permitted provided that the following conditions
 13 * are met:
 14 * 1. Redistributions of source code must retain the above copyright
 15 *    notice, this list of conditions and the following disclaimer.
 16 * 2. Redistributions in binary form must reproduce the above copyright
 17 *    notice, this list of conditions and the following disclaimer in the
 18 *    documentation and/or other materials provided with the distribution.
 19 *
 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 23 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 30 * POSSIBILITY OF SUCH DAMAGE.
 31 */
 32
 33#ifndef _SYS_IOSTAT_H_
 34#define _SYS_IOSTAT_H_
 35
 36/*
 37 * Disk device structures.
 38 */
 39
 40#include <sys/time.h>
 41#include <sys/queue.h>
 42
 43#define	IOSTATNAMELEN	16
 44
 45/* types of drives we can have */
 46#define IOSTAT_DISK	0
 47#define IOSTAT_TAPE	1
 48#define IOSTAT_NFS	2
 49
 50/* The following structure is 64-bit alignment safe */
 51struct io_sysctl {
 52	char		name[IOSTATNAMELEN];
 53	int32_t		busy;
 54	int32_t		type;
 55	u_int64_t	xfer;
 56	u_int64_t	seek;
 57	u_int64_t	bytes;
 58	u_int32_t	attachtime_sec;
 59	u_int32_t	attachtime_usec;
 60	u_int32_t	timestamp_sec;
 61	u_int32_t	timestamp_usec;
 62	u_int32_t	time_sec;
 63	u_int32_t	time_usec;
 64	/* New separate read/write stats */
 65	u_int64_t	rxfer;
 66	u_int64_t	rbytes;
 67	u_int64_t	wxfer;
 68	u_int64_t	wbytes;
 69	/*
 70	 * New queue stats
 71	 * accumulated wait time (iostat_wait .. iostat_busy)
 72	 * accumulated wait sum (wait time * count)
 73	 * accumulated busy sum (busy time * count)
 74	 */
 75	u_int32_t	wait_sec;
 76	u_int32_t	wait_usec;
 77	u_int32_t	waitsum_sec;
 78	u_int32_t	waitsum_usec;
 79	u_int32_t	busysum_sec;
 80	u_int32_t	busysum_usec;
 81};
 82
 83/*
 84 * Structure for keeping the in-kernel drive stats - these are linked
 85 * together in drivelist.
 86 */
 87
 88struct io_stats {
 89	char		io_name[IOSTATNAMELEN];  /* device name */
 90	void		*io_parent; /* pointer to what we are attached to */
 91	int		io_type;   /* type of device the state belong to */
 92	int		io_busy;	/* busy counter */
 93	int		io_wait;	/* wait counter */
 94	u_int64_t	io_rxfer;	/* total number of read transfers */
 95	u_int64_t	io_wxfer;	/* total number of write transfers */
 96	u_int64_t	io_seek;	/* total independent seek operations */
 97	u_int64_t	io_rbytes;	/* total bytes read */
 98	u_int64_t	io_wbytes;	/* total bytes written */
 99	struct timeval	io_attachtime;	/* time disk was attached */
100	struct timeval	io_timestamp;	/* timestamp of last unbusy */
101	struct timeval	io_busystamp;	/* timestamp of last busy */
102	struct timeval	io_waitstamp;	/* timestamp of last wait */
103	struct timeval	io_busysum;	/* accumulated wait * time */
104	struct timeval	io_waitsum;	/* accumulated busy * time */
105	struct timeval	io_busytime;	/* accumlated time busy */
106	struct timeval	io_waittime;	/* accumlated time waiting */
107	TAILQ_ENTRY(io_stats) io_link;
108};
109
110/*
111 * drivelist_head is defined here so that user-land has access to it.
112 */
113TAILQ_HEAD(iostatlist_head, io_stats);	/* the iostatlist is a TAILQ */
114
115#ifdef _KERNEL
116void	iostat_init(void);
117void	iostat_wait(struct io_stats *);
118void	iostat_busy(struct io_stats *);
119void	iostat_unbusy(struct io_stats *, long, int);
120bool	iostat_isbusy(struct io_stats *);
121struct io_stats *iostat_find(const char *);
122struct io_stats *iostat_alloc(int32_t, void *, const char *);
123void	iostat_free(struct io_stats *);
124void	iostat_rename(struct io_stats *, const char *);
125void	iostat_seek(struct io_stats *);
126#endif
127
128#endif /* _SYS_IOSTAT_H_ */