The Design and Implementation of the FreeBSD Operating System, Second Edition
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: src/sys/sys/devicestat.h,v 1.9 1999/12/29 04:24:39 peter Exp $
   29  */
   30 
   31 #ifndef _SYS_DEVICESTAT_H_
   32 #define _SYS_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    4
   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_FREE    = 0x03
   67 } devstat_trans_flags;
   68 
   69 typedef enum {
   70         DEVSTAT_TAG_SIMPLE      = 0x00,
   71         DEVSTAT_TAG_HEAD        = 0x01,
   72         DEVSTAT_TAG_ORDERED     = 0x02,
   73         DEVSTAT_TAG_NONE        = 0x03
   74 } devstat_tag_type;
   75 
   76 typedef enum {
   77         DEVSTAT_PRIORITY_MIN    = 0x000,
   78         DEVSTAT_PRIORITY_OTHER  = 0x020,
   79         DEVSTAT_PRIORITY_PASS   = 0x030,
   80         DEVSTAT_PRIORITY_FD     = 0x040,
   81         DEVSTAT_PRIORITY_WFD    = 0x050,
   82         DEVSTAT_PRIORITY_TAPE   = 0x060,
   83         DEVSTAT_PRIORITY_CD     = 0x090,
   84         DEVSTAT_PRIORITY_DISK   = 0x110,
   85         DEVSTAT_PRIORITY_ARRAY  = 0x120,
   86         DEVSTAT_PRIORITY_MAX    = 0xfff
   87 } devstat_priority;
   88 
   89 /*
   90  * These types are intended to aid statistics gathering/display programs.
   91  * The first 13 types (up to the 'target' flag) are identical numerically
   92  * to the SCSI device type numbers.  The next 3 types designate the device
   93  * interface.  Currently the choices are IDE, SCSI, and 'other'.  The last
   94  * flag specifies whether or not the given device is a passthrough device
   95  * or not.  If it is a passthrough device, the lower 4 bits specify which
   96  * type of physical device lies under the passthrough device, and the next
   97  * 4 bits specify the interface.
   98  */
   99 typedef enum {
  100         DEVSTAT_TYPE_DIRECT     = 0x000,
  101         DEVSTAT_TYPE_SEQUENTIAL = 0x001,
  102         DEVSTAT_TYPE_PRINTER    = 0x002,
  103         DEVSTAT_TYPE_PROCESSOR  = 0x003,
  104         DEVSTAT_TYPE_WORM       = 0x004,
  105         DEVSTAT_TYPE_CDROM      = 0x005,
  106         DEVSTAT_TYPE_SCANNER    = 0x006,
  107         DEVSTAT_TYPE_OPTICAL    = 0x007,
  108         DEVSTAT_TYPE_CHANGER    = 0x008,
  109         DEVSTAT_TYPE_COMM       = 0x009,
  110         DEVSTAT_TYPE_ASC0       = 0x00a,
  111         DEVSTAT_TYPE_ASC1       = 0x00b,
  112         DEVSTAT_TYPE_STORARRAY  = 0x00c,
  113         DEVSTAT_TYPE_ENCLOSURE  = 0x00d,
  114         DEVSTAT_TYPE_FLOPPY     = 0x00e,
  115         DEVSTAT_TYPE_MASK       = 0x00f,
  116         DEVSTAT_TYPE_IF_SCSI    = 0x010,
  117         DEVSTAT_TYPE_IF_IDE     = 0x020,
  118         DEVSTAT_TYPE_IF_OTHER   = 0x030,
  119         DEVSTAT_TYPE_IF_MASK    = 0x0f0,
  120         DEVSTAT_TYPE_PASS       = 0x100
  121 } devstat_type_flags;
  122 
  123 struct devstat {
  124         STAILQ_ENTRY(devstat)   dev_links;
  125         u_int32_t               device_number;       /*
  126                                                       * Devstat device
  127                                                       * number.
  128                                                       */
  129         char                    device_name[DEVSTAT_NAME_LEN];
  130         int                     unit_number;
  131         u_int64_t               bytes_read;          /*
  132                                                       * Total bytes read
  133                                                       * from a device.
  134                                                       */
  135         u_int64_t               bytes_written;       /*
  136                                                       * Total bytes written
  137                                                       * to a device.
  138                                                       */
  139         u_int64_t               bytes_freed;         /*
  140                                                       * Total bytes freed
  141                                                       * from a device.
  142                                                       */
  143         u_int64_t               num_reads;           /*
  144                                                       * Total number of
  145                                                       * read requests to 
  146                                                       * the device.
  147                                                       */
  148         u_int64_t               num_writes;          /*
  149                                                       * Total number of
  150                                                       * write requests to 
  151                                                       * the device.
  152                                                       */
  153         u_int64_t               num_frees;           /*
  154                                                       * Total number of
  155                                                       * free requests to 
  156                                                       * the device.
  157                                                       */
  158         u_int64_t               num_other;           /*
  159                                                       * Total number of
  160                                                       * transactions that 
  161                                                       * don't read or write 
  162                                                       * data.
  163                                                       */
  164         int32_t                 busy_count;          /*
  165                                                       * Total number of 
  166                                                       * transactions
  167                                                       * outstanding for 
  168                                                       * the device. 
  169                                                       */
  170         u_int32_t               block_size;          /* Block size, bytes */
  171         u_int64_t               tag_types[3];        /*
  172                                                       * The number of
  173                                                       * simple, ordered, 
  174                                                       * and head of queue 
  175                                                       * tags sent.
  176                                                       */
  177         struct timeval          dev_creation_time;   /* 
  178                                                       * Time the device was
  179                                                       * created.
  180                                                       */
  181         struct timeval          busy_time;           /*
  182                                                       * Total amount of
  183                                                       * time drive has spent 
  184                                                       * processing requests.
  185                                                       */
  186         struct timeval          start_time;          /*
  187                                                       * The time when
  188                                                       * busy_count was 
  189                                                       * last == 0.  Or, the
  190                                                       * start of the latest 
  191                                                       * busy period.
  192                                                       */
  193         struct timeval          last_comp_time;      /*
  194                                                       * Last time a
  195                                                       * transaction was 
  196                                                       * completed.
  197                                                       */
  198 
  199         devstat_support_flags   flags;               /*
  200                                                       * Which statistics
  201                                                       * are supported by a 
  202                                                       * given device.
  203                                                       */
  204         devstat_type_flags      device_type;         /* Device type */
  205         devstat_priority        priority;            /* Controls list pos. */
  206 };
  207 
  208 #ifdef _KERNEL
  209 struct buf;
  210 void devstat_add_entry(struct devstat *ds, const char *dev_name, 
  211                        int unit_number, u_int32_t block_size,
  212                        devstat_support_flags flags,
  213                        devstat_type_flags device_type,
  214                        devstat_priority priority);
  215 void devstat_remove_entry(struct devstat *ds);
  216 void devstat_start_transaction(struct devstat *ds);
  217 void devstat_end_transaction(struct devstat *ds, u_int32_t bytes, 
  218                              devstat_tag_type tag_type,
  219                              devstat_trans_flags flags);
  220 void devstat_end_transaction_buf(struct devstat *ds, struct buf *);
  221 #endif
  222 
  223 #endif /* !_SYS_DEVICESTAT_H_ */

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