Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sys/devicestat.h
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1 /* 2 * Copyright (c) 1997, 1998, 1999 Kenneth D. Merry. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _DEVICESTAT_H 32 #define _DEVICESTAT_H 33 34 #include <sys/queue.h> 35 #include <sys/time.h> 36 37 #define DEVSTAT_NAME_LEN 16 38 39 /* 40 * ATTENTION: The devstat version below should be incremented any time a 41 * change is made in struct devstat, or any time a change is made in the 42 * enumerated types that struct devstat uses. (Only if those changes 43 * would require a recompile -- i.e. re-arranging the order of an 44 * enumerated type or something like that.) This version number is used by 45 * userland utilities to determine whether or not they are in sync with the 46 * kernel. 47 */ 48 #define DEVSTAT_VERSION 3 49 50 /* 51 * These flags specify which statistics features are supported or not 52 * supported by a particular device. The default is all statistics are 53 * supported. 54 */ 55 typedef enum { 56 DEVSTAT_ALL_SUPPORTED = 0x00, 57 DEVSTAT_NO_BLOCKSIZE = 0x01, 58 DEVSTAT_NO_ORDERED_TAGS = 0x02, 59 DEVSTAT_BS_UNAVAILABLE = 0x04 60 } devstat_support_flags; 61 62 typedef enum { 63 DEVSTAT_NO_DATA = 0x00, 64 DEVSTAT_READ = 0x01, 65 DEVSTAT_WRITE = 0x02 66 } devstat_trans_flags; 67 68 typedef enum { 69 DEVSTAT_TAG_SIMPLE = 0x00, 70 DEVSTAT_TAG_HEAD = 0x01, 71 DEVSTAT_TAG_ORDERED = 0x02, 72 DEVSTAT_TAG_NONE = 0x03 73 } devstat_tag_type; 74 75 typedef enum { 76 DEVSTAT_PRIORITY_MIN = 0x000, 77 DEVSTAT_PRIORITY_OTHER = 0x020, 78 DEVSTAT_PRIORITY_PASS = 0x030, 79 DEVSTAT_PRIORITY_FD = 0x040, 80 DEVSTAT_PRIORITY_WFD = 0x050, 81 DEVSTAT_PRIORITY_SA = 0x060, 82 DEVSTAT_PRIORITY_OCD = 0x070, 83 DEVSTAT_PRIORITY_WCD = 0x080, 84 DEVSTAT_PRIORITY_CD = 0x090, 85 DEVSTAT_PRIORITY_WD = 0x100, 86 DEVSTAT_PRIORITY_DA = 0x110, 87 DEVSTAT_PRIORITY_CCD = 0x120, 88 DEVSTAT_PRIORITY_MAX = 0xfff 89 } devstat_priority; 90 91 /* 92 * These types are intended to aid statistics gathering/display programs. 93 * The first 13 types (up to the 'target' flag) are identical numerically 94 * to the SCSI device type numbers. The next 3 types designate the device 95 * interface. Currently the choices are IDE, SCSI, and 'other'. The last 96 * flag specifies whether or not the given device is a passthrough device 97 * or not. If it is a passthrough device, the lower 4 bits specify which 98 * type of physical device lies under the passthrough device, and the next 99 * 4 bits specify the interface. 100 */ 101 typedef enum { 102 DEVSTAT_TYPE_DIRECT = 0x000, 103 DEVSTAT_TYPE_SEQUENTIAL = 0x001, 104 DEVSTAT_TYPE_PRINTER = 0x002, 105 DEVSTAT_TYPE_PROCESSOR = 0x003, 106 DEVSTAT_TYPE_WORM = 0x004, 107 DEVSTAT_TYPE_CDROM = 0x005, 108 DEVSTAT_TYPE_SCANNER = 0x006, 109 DEVSTAT_TYPE_OPTICAL = 0x007, 110 DEVSTAT_TYPE_CHANGER = 0x008, 111 DEVSTAT_TYPE_COMM = 0x009, 112 DEVSTAT_TYPE_ASC0 = 0x00a, 113 DEVSTAT_TYPE_ASC1 = 0x00b, 114 DEVSTAT_TYPE_STORARRAY = 0x00c, 115 DEVSTAT_TYPE_ENCLOSURE = 0x00d, 116 DEVSTAT_TYPE_FLOPPY = 0x00e, 117 DEVSTAT_TYPE_MASK = 0x00f, 118 DEVSTAT_TYPE_IF_SCSI = 0x010, 119 DEVSTAT_TYPE_IF_IDE = 0x020, 120 DEVSTAT_TYPE_IF_OTHER = 0x030, 121 DEVSTAT_TYPE_IF_MASK = 0x0f0, 122 DEVSTAT_TYPE_PASS = 0x100 123 } devstat_type_flags; 124 125 struct devstat { 126 STAILQ_ENTRY(devstat) dev_links; 127 u_int32_t device_number; /* 128 * Devstat device 129 * number. 130 */ 131 char device_name[DEVSTAT_NAME_LEN]; 132 int unit_number; 133 u_int64_t bytes_written; /* 134 * Total bytes written 135 * to a device. 136 */ 137 u_int64_t bytes_read; /* 138 * Total bytes read 139 * from a device. 140 */ 141 u_int64_t num_reads; /* 142 * Total number of 143 * read requests to 144 * the device. 145 */ 146 u_int64_t num_writes; /* 147 * Total number of 148 * write requests to 149 * the device. 150 */ 151 u_int64_t num_other; /* 152 * Total number of 153 * transactions that 154 * don't read or write 155 * data. 156 */ 157 int32_t busy_count; /* 158 * Total number of 159 * transactions 160 * outstanding for 161 * the device. 162 */ 163 u_int32_t block_size; /* Block size, bytes */ 164 u_int64_t tag_types[3]; /* 165 * The number of 166 * simple, ordered, 167 * and head of queue 168 * tags sent. 169 */ 170 struct timeval dev_creation_time; /* 171 * Time the device was 172 * created. 173 */ 174 struct timeval busy_time; /* 175 * Total amount of 176 * time drive has spent 177 * processing requests. 178 */ 179 struct timeval start_time; /* 180 * The time when 181 * busy_count was 182 * last == 0. Or, the 183 * start of the latest 184 * busy period. 185 */ 186 struct timeval last_comp_time; /* 187 * Last time a 188 * transaction was 189 * completed. 190 */ 191 192 devstat_support_flags flags; /* 193 * Which statistics 194 * are supported by a 195 * given device. 196 */ 197 devstat_type_flags device_type; /* Device type */ 198 devstat_priority priority; /* Controls list pos. */ 199 }; 200 201 #ifdef KERNEL 202 void devstat_add_entry(struct devstat *ds, const char *dev_name, 203 int unit_number, u_int32_t block_size, 204 devstat_support_flags flags, 205 devstat_type_flags device_type, 206 devstat_priority priority); 207 void devstat_remove_entry(struct devstat *ds); 208 void devstat_start_transaction(struct devstat *ds); 209 void devstat_end_transaction(struct devstat *ds, u_int32_t bytes, 210 devstat_tag_type tag_type, 211 devstat_trans_flags flags); 212 #endif 213 214 #endif /* _DEVICESTAT_H */
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