usr/src/uts/common/sys/strft.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #ifndef _SYS_STRFT_H
  27 #define _SYS_STRFT_H
  28
  29 #ifdef  __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 /*
  34  * The flow trace subsystem is used to trace the flow of STREAMS messages
  35  * through a stream.
  36  *
  37  * WARNING: this is a private subsystem and subject to change at any time!
  38  */
  39
  40 #include <sys/time.h>
  41 #include <sys/types.h>
  42 #include <sys/stream.h>
  43
  44 /*
  45  * Some evnt defines, values 0..N are reserved for internal use,
  46  * (N+1)..0x1FFF are available for arbitrary module/drvier use,
  47  * 0x8000 (RD/WR q marker) and 0x4000 (thread cs marker) are or'ed
  48  * flag bits reserved for internal use.
  49  */
  50 #define FTEV_MASK       0x1FFF
  51 #define FTEV_ISWR       0x8000
  52 #define FTEV_CS         0x4000
  53 #define FTEV_PS         0x2000
  54
  55 #define FTEV_QMASK      0x1F00
  56
  57 #define FTEV_ALLOCMASK  0x1FF8
  58 #define FTEV_ALLOCB     0x0000
  59 #define FTEV_ESBALLOC   0x0001
  60 #define FTEV_DESBALLOC  0x0002
  61 #define FTEV_ESBALLOCA  0x0003
  62 #define FTEV_DESBALLOCA 0x0004
  63 #define FTEV_ALLOCBIG   0x0005
  64 #define FTEV_ALLOCBW    0x0006
  65 #define FTEV_BCALLOCB   0x0007
  66 #define FTEV_FREEB      0x0008
  67 #define FTEV_DUPB       0x0009
  68 #define FTEV_COPYB      0x000A
  69
  70 #define FTEV_CALLER     0x000F
  71
  72 #define FTEV_PUT        0x0100
  73 #define FTEV_PUTQ       0x0105
  74 #define FTEV_GETQ       0x0106
  75 #define FTEV_RMVQ       0x0107
  76 #define FTEV_INSQ       0x0108
  77 #define FTEV_PUTBQ      0x0109
  78 #define FTEV_FLUSHQ     0x010A
  79 #define FTEV_PUTNEXT    0x010D
  80 #define FTEV_RWNEXT     0x010E
  81
  82 #define FTBLK_EVNTS     9
  83 #define FTSTK_DEPTH     15
  84
  85 /*
  86  * Stack information for each flow trace event; recorded when str_ftstack
  87  * is non-zero.
  88  */
  89 typedef struct ftstk {
  90         uint_t          fs_depth;
  91         pc_t            fs_stk[FTSTK_DEPTH];
  92 } ftstk_t;
  93
  94 /*
  95  * Data structure that contains the timestamp, module/driver name, next
  96  * module/driver name, optional callstack, event and event data (not certain
  97  * as to its use yet: RSF).  There is one per event.  Every time str_ftevent()
  98  * is called, one of the indices is filled in with this data.
  99  */
 100 typedef struct ftevnt {
 101         hrtime_t        ts;             /* event timestamp, per gethrtime() */
 102         char            *mid;           /* module/driver name */
 103         char            *midnext;       /* next module/driver name */
 104         ushort_t        evnt;           /* FTEV_* value above */
 105         ushort_t        data;           /* event data */
 106         ftstk_t         *stk;           /* optional event callstack */
 107 } ftevnt_t;
 108
 109 /*
 110  * A linked list of ftevnt arrays.
 111  */
 112 typedef struct ftblk {
 113         struct ftblk *nxt;      /* next ftblk (or NULL if none) */
 114         int ix;                 /* index of next free ev[] */
 115         struct ftevnt ev[FTBLK_EVNTS];
 116 } ftblk_t;
 117
 118 /*
 119  * The flow trace header (start of event list).  It consists of the
 120  *      current writable block (tail)
 121  *      a hash value (for recovering trace information)
 122  *      The last thread to process an event
 123  *      The last cpu to process an event
 124  *      The start of the list
 125  * This structure is attached to a dblk, and traces a message through
 126  * a flow.
 127  */
 128 typedef struct fthdr {
 129         struct ftblk *tail;
 130         uint_t hash;            /* accumulated hash value (sum of mid's) */
 131         void *thread;
 132         int cpu_seqid;
 133         struct ftblk first;
 134 } fthdr_t;
 135
 136 #ifdef _KERNEL
 137
 138 struct datab;
 139
 140 extern void str_ftevent(fthdr_t *, void *, ushort_t, ushort_t);
 141 extern void str_ftfree(struct datab *);
 142 extern int str_ftnever, str_ftstack;
 143
 144 /*
 145  * Allocate flow-trace information and record an allocation event.
 146  */
 147 #define STR_FTALLOC(hpp, e, d) {                                        \
 148         if (str_ftnever == 0) {                                         \
 149                 fthdr_t *_hp = *(hpp);                                  \
 150                                                                         \
 151                 ASSERT(_hp == NULL);                                    \
 152                 _hp = kmem_cache_alloc(fthdr_cache, KM_NOSLEEP);        \
 153                 if ((*hpp = _hp) != NULL) {                             \
 154                         _hp->tail = &_hp->first;                        \
 155                         _hp->hash = 0;                                  \
 156                         _hp->thread = curthread;                        \
 157                         _hp->cpu_seqid = CPU->cpu_seqid;                \
 158                         _hp->first.nxt = NULL;                          \
 159                         _hp->first.ix = 0;                              \
 160                         str_ftevent(_hp, caller(), (e), (d));           \
 161                 }                                                       \
 162         }                                                               \
 163 }
 164
 165 /*
 166  * Add a flow-trace event to the passed-in mblk_t and any other mblk_t's
 167  * chained off of b_cont.
 168  */
 169 #define STR_FTEVENT_MSG(mp, p, e, d) {                                  \
 170         if (str_ftnever == 0) {                                         \
 171                 mblk_t *_mp;                                            \
 172                 fthdr_t *_hp;                                           \
 173                                                                         \
 174                 for (_mp = (mp); _mp != NULL; _mp = _mp->b_cont) {      \
 175                         if ((_hp = DB_FTHDR(_mp)) != NULL)              \
 176                                 str_ftevent(_hp, (p), (e), (d));        \
 177                 }                                                       \
 178         }                                                               \
 179 }
 180
 181 /*
 182  * Add a flow-trace event to *just* the passed-in mblk_t.
 183  */
 184 #define STR_FTEVENT_MBLK(mp, p, e, d) {                                 \
 185         if (str_ftnever == 0) {                                         \
 186                 fthdr_t *_hp;                                           \
 187                                                                         \
 188                 if ((mp) != NULL && ((_hp = DB_FTHDR(mp)) != NULL))     \
 189                         str_ftevent(_hp, (p), (e), (d));                \
 190         }                                                               \
 191 }
 192
 193 #endif /* _KERNEL */
 194
 195 #ifdef  __cplusplus
 196 }
 197 #endif
 198
 199 #endif  /* _SYS_STRFT_H */