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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 /*
38  * XXX: Should really be SPECNAMELEN
39  */
40 #define DEVSTAT_NAME_LEN  16
41
42 /*
43  * device name for the mmap device
44  */
45 #define DEVSTAT_DEVICE_NAME "devstat"
46
47 /*
48  * ATTENTION:  The devstat version below should be incremented any time a
49  * change is made in struct devstat, or any time a change is made in the
50  * enumerated types that struct devstat uses.  (Only if those changes
51  * would require a recompile -- i.e. re-arranging the order of an
52  * enumerated type or something like that.)  This version number is used by
53  * userland utilities to determine whether or not they are in sync with the
54  * kernel.
55  */
56 #define DEVSTAT_VERSION    6
57
58 /*
59  * These flags specify which statistics features are supported or not
60  * supported by a particular device.  The default is all statistics are
61  * supported.
62  */
63 typedef enum {
64         DEVSTAT_ALL_SUPPORTED   = 0x00,
65         DEVSTAT_NO_BLOCKSIZE    = 0x01,
66         DEVSTAT_NO_ORDERED_TAGS = 0x02,
67         DEVSTAT_BS_UNAVAILABLE  = 0x04
68 } devstat_support_flags;
69
70 typedef enum {
71         DEVSTAT_NO_DATA = 0x00,
72         DEVSTAT_READ    = 0x01,
73         DEVSTAT_WRITE   = 0x02,
74         DEVSTAT_FREE    = 0x03
75 } devstat_trans_flags;
76 #define DEVSTAT_N_TRANS_FLAGS   4
77
78 typedef enum {
79         DEVSTAT_TAG_SIMPLE      = 0x00,
80         DEVSTAT_TAG_HEAD        = 0x01,
81         DEVSTAT_TAG_ORDERED     = 0x02,
82         DEVSTAT_TAG_NONE        = 0x03
83 } devstat_tag_type;
84
85 typedef enum {
86         DEVSTAT_PRIORITY_MIN    = 0x000,
87         DEVSTAT_PRIORITY_OTHER  = 0x020,
88         DEVSTAT_PRIORITY_PASS   = 0x030,
89         DEVSTAT_PRIORITY_FD     = 0x040,
90         DEVSTAT_PRIORITY_WFD    = 0x050,
91         DEVSTAT_PRIORITY_TAPE   = 0x060,
92         DEVSTAT_PRIORITY_CD     = 0x090,
93         DEVSTAT_PRIORITY_DISK   = 0x110,
94         DEVSTAT_PRIORITY_ARRAY  = 0x120,
95         DEVSTAT_PRIORITY_MAX    = 0xfff
96 } devstat_priority;
97
98 /*
99  * These types are intended to aid statistics gathering/display programs.
100  * The first 13 types (up to the 'target' flag) are identical numerically
101  * to the SCSI device type numbers.  The next 3 types designate the device
102  * interface.  Currently the choices are IDE, SCSI, and 'other'.  The last
103  * flag specifies whether or not the given device is a passthrough device
104  * or not.  If it is a passthrough device, the lower 4 bits specify which
105  * type of physical device lies under the passthrough device, and the next
106  * 4 bits specify the interface.
107  */
108 typedef enum {
109         DEVSTAT_TYPE_DIRECT     = 0x000,
110         DEVSTAT_TYPE_SEQUENTIAL = 0x001,
111         DEVSTAT_TYPE_PRINTER    = 0x002,
112         DEVSTAT_TYPE_PROCESSOR  = 0x003,
113         DEVSTAT_TYPE_WORM       = 0x004,
114         DEVSTAT_TYPE_CDROM      = 0x005,
115         DEVSTAT_TYPE_SCANNER    = 0x006,
116         DEVSTAT_TYPE_OPTICAL    = 0x007,
117         DEVSTAT_TYPE_CHANGER    = 0x008,
118         DEVSTAT_TYPE_COMM       = 0x009,
119         DEVSTAT_TYPE_ASC0       = 0x00a,
120         DEVSTAT_TYPE_ASC1       = 0x00b,
121         DEVSTAT_TYPE_STORARRAY  = 0x00c,
122         DEVSTAT_TYPE_ENCLOSURE  = 0x00d,
123         DEVSTAT_TYPE_FLOPPY     = 0x00e,
124         DEVSTAT_TYPE_MASK       = 0x00f,
125         DEVSTAT_TYPE_IF_SCSI    = 0x010,
126         DEVSTAT_TYPE_IF_IDE     = 0x020,
127         DEVSTAT_TYPE_IF_OTHER   = 0x030,
128         DEVSTAT_TYPE_IF_MASK    = 0x0f0,
129         DEVSTAT_TYPE_PASS       = 0x100
130 } devstat_type_flags;
131
132 /*
133  * XXX: Next revision should add
134  *      off_t           offset[DEVSTAT_N_TRANS_FLAGS];
135  * XXX: which should contain the offset of the last completed transfer.
136  */
137 struct devstat {
138         /* Internal house-keeping fields */
139         u_int                   sequence0;           /* Update sequence# */
140         int                     allocated;           /* Allocated entry */
141         u_int                   start_count;         /* started ops */
142         u_int                   end_count;           /* completed ops */
143         struct bintime          busy_from;           /*
144                                                       * busy time unaccounted
145                                                       * for since this time
146                                                       */
147         STAILQ_ENTRY(devstat)   dev_links;
148         u_int32_t               device_number;       /*
149                                                       * Devstat device
150                                                       * number.
151                                                       */
152         char                    device_name[DEVSTAT_NAME_LEN];
153         int                     unit_number;
154         u_int64_t               bytes[DEVSTAT_N_TRANS_FLAGS];
155         u_int64_t               operations[DEVSTAT_N_TRANS_FLAGS];
156         struct bintime          duration[DEVSTAT_N_TRANS_FLAGS];
157         struct bintime          busy_time;
158         struct bintime          creation_time;       /* 
159                                                       * Time the device was
160                                                       * created.
161                                                       */
162         u_int32_t               block_size;          /* Block size, bytes */
163         u_int64_t               tag_types[3];        /*
164                                                       * The number of
165                                                       * simple, ordered, 
166                                                       * and head of queue 
167                                                       * tags sent.
168                                                       */
169         devstat_support_flags   flags;               /*
170                                                       * Which statistics
171                                                       * are supported by a 
172                                                       * given device.
173                                                       */
174         devstat_type_flags      device_type;         /* Device type */
175         devstat_priority        priority;            /* Controls list pos. */
176         const void              *id;                 /*
177                                                       * Identification for
178                                                       * GEOM nodes
179                                                       */
180         u_int                   sequence1;           /* Update sequence# */
181 };
182
183 STAILQ_HEAD(devstatlist, devstat);
184
185 #ifdef _KERNEL
186 struct bio;
187
188 struct devstat *devstat_new_entry(const void *dev_name, int unit_number,
189                                   u_int32_t block_size,
190                                   devstat_support_flags flags,
191                                   devstat_type_flags device_type,
192                                   devstat_priority priority);
193
194 void devstat_remove_entry(struct devstat *ds);
195 void devstat_start_transaction(struct devstat *ds, struct bintime *now);
196 void devstat_start_transaction_bio(struct devstat *ds, struct bio *bp);
197 void devstat_end_transaction(struct devstat *ds, u_int32_t bytes, 
198                              devstat_tag_type tag_type,
199                              devstat_trans_flags flags,
200                              struct bintime *now, struct bintime *then);
201 void devstat_end_transaction_bio(struct devstat *ds, struct bio *bp);
202 #endif
203
204 #endif /* _DEVICESTAT_H */