ceph/src/spdk/dpdk/examples/performance-thread/common/lthread_diag_api.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2015 Intel Corporation
   3  */
   4 #ifndef LTHREAD_DIAG_API_H_
   5 #define LTHREAD_DIAG_API_H_
   6
   7 #ifdef __cplusplus
   8 extern "C" {
   9 #endif
  10
  11 #include <stdint.h>
  12 #include <inttypes.h>
  13
  14 /*
  15  * Enable diagnostics
  16  * 0 = conditionally compiled out
  17  * 1 = compiled in and maskable at run time, see below for details
  18  */
  19 #define LTHREAD_DIAG 0
  20
  21 /**
  22  *
  23  * @file lthread_diag_api.h
  24  *
  25  * @warning
  26  * @b EXPERIMENTAL: this API may change without prior notice
  27  *
  28  * lthread diagnostic interface
  29  *
  30  * If enabled via configuration file option ( tbd ) the lthread subsystem
  31  * can generate selected trace information, either RTE_LOG  (INFO) messages,
  32  * or else invoke a user supplied callback function when any of the events
  33  * listed below occur.
  34  *
  35  * Reporting of events can be selectively masked, the bit position in the
  36  * mask is determined by the corresponding event identifier listed below.
  37  *
  38  * Diagnostics are enabled by registering the callback function and mask
  39  * using the API lthread_diagnostic_enable().
  40  *
  41  * Various interesting parameters are passed to the callback, including the
  42  * time in cpu clks, the lthread id, the diagnostic event id, a user ref value,
  43  * event text string, object being traced, and two context dependent parameters
  44  * (p1 and p2). The meaning of the two parameters p1 and p2 depends on
  45  * the specific event.
  46  *
  47  * The events LT_DIAG_LTHREAD_CREATE, LT_DIAG_MUTEX_CREATE and
  48  * LT_DIAG_COND_CREATE are implicitly enabled if the event mask includes any of
  49  * the LT_DIAG_LTHREAD_XXX, LT_DIAG_MUTEX_XXX or LT_DIAG_COND_XXX events
  50  * respectively.
  51  *
  52  * These create events may also be included in the mask discreetly if it is
  53  * desired to monitor only create events.
  54  *
  55  * @param  time
  56  *  The time in cpu clks at which the event occurred
  57  *
  58  * @param  lthread
  59  *  The current lthread
  60  *
  61  * @param diag_event
  62  *  The diagnostic event id (bit position in the mask)
  63  *
  64  * @param  diag_ref
  65  *
  66  * For LT_DIAG_LTHREAD_CREATE, LT_DIAG_MUTEX_CREATE or LT_DIAG_COND_CREATE
  67  * this parameter is not used and set to 0.
  68  * All other events diag_ref contains the user ref value returned by the
  69  * callback function when lthread is created.
  70  *
  71  * The diag_ref values assigned to mutex and cond var can be retrieved
  72  * using the APIs lthread_mutex_diag_ref(), and lthread_cond_diag_ref()
  73  * respectively.
  74  *
  75  * @param p1
  76  *  see below
  77  *
  78  * @param p1
  79  *  see below
  80  *
  81  * @returns
  82  * For LT_DIAG_LTHREAD_CREATE, LT_DIAG_MUTEX_CREATE or LT_DIAG_COND_CREATE
  83  * expects a user diagnostic ref value that will be saved in the lthread, mutex
  84  * or cond var.
  85  *
  86  * For all other events return value is ignored.
  87  *
  88  *      LT_DIAG_SCHED_CREATE - Invoked when a scheduler is created
  89  *              p1 = the scheduler that was created
  90  *              p2 = not used
  91  *              return value will be ignored
  92  *
  93  *      LT_DIAG_SCHED_SHUTDOWN - Invoked when a shutdown request is received
  94  *              p1 = the scheduler to be shutdown
  95  *              p2 = not used
  96  *              return value will be ignored
  97  *
  98  *      LT_DIAG_LTHREAD_CREATE - Invoked when a thread is created
  99  *              p1 = the lthread that was created
 100  *              p2 = not used
 101  *              return value will be stored in the lthread
 102  *
 103  *      LT_DIAG_LTHREAD_EXIT - Invoked when a lthread exits
 104  *              p2 = 0 if the thread was already joined
 105  *              p2 = 1 if the thread was not already joined
 106  *              return val ignored
 107  *
 108  *      LT_DIAG_LTHREAD_JOIN - Invoked when a lthread exits
 109  *              p1 = the lthread that is being joined
 110  *              p2 = 0 if the thread was already exited
 111  *              p2 = 1 if the thread was not already exited
 112  *              return val ignored
 113  *
 114  *      LT_DIAG_LTHREAD_CANCELLED - Invoked when an lthread is cancelled
 115  *              p1 = not used
 116  *              p2 = not used
 117  *              return val ignored
 118  *
 119  *      LT_DIAG_LTHREAD_DETACH - Invoked when an lthread is detached
 120  *              p1 = not used
 121  *              p2 = not used
 122  *              return val ignored
 123  *
 124  *      LT_DIAG_LTHREAD_FREE - Invoked when an lthread is freed
 125  *              p1 = not used
 126  *              p2 = not used
 127  *              return val ignored
 128  *
 129  *      LT_DIAG_LTHREAD_SUSPENDED - Invoked when an lthread is suspended
 130  *              p1 = not used
 131  *              p2 = not used
 132  *              return val ignored
 133  *
 134  *      LT_DIAG_LTHREAD_YIELD - Invoked when an lthread explicitly yields
 135  *              p1 = not used
 136  *              p2 = not used
 137  *              return val ignored
 138  *
 139  *      LT_DIAG_LTHREAD_RESCHEDULED - Invoked when an lthread is rescheduled
 140  *              p1 = not used
 141  *              p2 = not used
 142  *              return val ignored
 143  *
 144  *      LT_DIAG_LTHREAD_RESUMED - Invoked when an lthread is resumed
 145  *              p1 = not used
 146  *              p2 = not used
 147  *              return val ignored
 148  *
 149  *      LT_DIAG_LTHREAD_AFFINITY - Invoked when an lthread is affinitised
 150  *              p1 = the destination lcore_id
 151  *              p2 = not used
 152  *              return val ignored
 153  *
 154  *      LT_DIAG_LTHREAD_TMR_START - Invoked when an lthread starts a timer
 155  *              p1 = address of timer node
 156  *              p2 = the timeout value
 157  *              return val ignored
 158  *
 159  *      LT_DIAG_LTHREAD_TMR_DELETE - Invoked when an lthread deletes a timer
 160  *              p1 = address of the timer node
 161  *              p2 = 0 the timer and the was successfully deleted
 162  *              p2 = not usee
 163  *              return val ignored
 164  *
 165  *      LT_DIAG_LTHREAD_TMR_EXPIRED - Invoked when an lthread timer expires
 166  *              p1 = address of scheduler the timer expired on
 167  *              p2 = the thread associated with the timer
 168  *              return val ignored
 169  *
 170  *      LT_DIAG_COND_CREATE - Invoked when a condition variable is created
 171  *              p1 = address of cond var that was created
 172  *              p2 = not used
 173  *              return diag ref value will be stored in the condition variable
 174  *
 175  *      LT_DIAG_COND_DESTROY - Invoked when a condition variable is destroyed
 176  *              p1 = not used
 177  *              p2 = not used
 178  *              return val ignored
 179  *
 180  *      LT_DIAG_COND_WAIT - Invoked when an lthread waits on a cond var
 181  *              p1 = the address of the condition variable
 182  *              p2 = not used
 183  *              return val ignored
 184  *
 185  *      LT_DIAG_COND_SIGNAL - Invoked when an lthread signals a cond var
 186  *              p1 = the address of the cond var
 187  *              p2 = the lthread that was signalled, or error code
 188  *              return val ignored
 189  *
 190  *      LT_DIAG_COND_BROADCAST - Invoked when an lthread broadcasts a cond var
 191  *              p1 = the address of the condition variable
 192  *              p2 = the lthread(s) that are signalled, or error code
 193  *
 194  *      LT_DIAG_MUTEX_CREATE - Invoked when a mutex is created
 195  *              p1 = address of muex
 196  *              p2 = not used
 197  *              return diag ref value will be stored in the mutex variable
 198  *
 199  *      LT_DIAG_MUTEX_DESTROY - Invoked when a mutex is destroyed
 200  *              p1 = address of mutex
 201  *              p2 = not used
 202  *              return val ignored
 203  *
 204  *      LT_DIAG_MUTEX_LOCK - Invoked when a mutex lock is obtained
 205  *              p1 = address of mutex
 206  *              p2 = function return value
 207  *              return val ignored
 208  *
 209  *      LT_DIAG_MUTEX_BLOCKED  - Invoked when an lthread blocks on a mutex
 210  *              p1 = address of mutex
 211  *              p2 = function return value
 212  *              return val ignored
 213  *
 214  *      LT_DIAG_MUTEX_TRYLOCK - Invoked when a mutex try lock is attempted
 215  *              p1 = address of mutex
 216  *              p2 = the function return value
 217  *              return val ignored
 218  *
 219  *      LT_DIAG_MUTEX_UNLOCKED - Invoked when a mutex is unlocked
 220  *              p1 = address of mutex
 221  *              p2 = the thread that was unlocked, or error code
 222  *              return val ignored
 223  */
 224 typedef uint64_t (*diag_callback) (uint64_t time, struct lthread *lt,
 225                                   int diag_event, uint64_t diag_ref,
 226                                 const char *text, uint64_t p1, uint64_t p2);
 227
 228 /*
 229  * Set user diagnostic callback and mask
 230  * If the callback function pointer is NULL the default
 231  * callback handler will be restored.
 232  */
 233 void lthread_diagnostic_enable(diag_callback cb, uint64_t diag_mask);
 234
 235 /*
 236  * Set diagnostic mask
 237  */
 238 void lthread_diagnostic_set_mask(uint64_t mask);
 239
 240 /*
 241  * lthread diagnostic callback
 242  */
 243 enum lthread_diag_ev {
 244         /* bits 0 - 14 lthread flag group */
 245         LT_DIAG_LTHREAD_CREATE,         /* 00 mask 0x00000001 */
 246         LT_DIAG_LTHREAD_EXIT,           /* 01 mask 0x00000002 */
 247         LT_DIAG_LTHREAD_JOIN,           /* 02 mask 0x00000004 */
 248         LT_DIAG_LTHREAD_CANCEL,         /* 03 mask 0x00000008 */
 249         LT_DIAG_LTHREAD_DETACH,         /* 04 mask 0x00000010 */
 250         LT_DIAG_LTHREAD_FREE,           /* 05 mask 0x00000020 */
 251         LT_DIAG_LTHREAD_SUSPENDED,      /* 06 mask 0x00000040 */
 252         LT_DIAG_LTHREAD_YIELD,          /* 07 mask 0x00000080 */
 253         LT_DIAG_LTHREAD_RESCHEDULED,    /* 08 mask 0x00000100 */
 254         LT_DIAG_LTHREAD_SLEEP,          /* 09 mask 0x00000200 */
 255         LT_DIAG_LTHREAD_RESUMED,        /* 10 mask 0x00000400 */
 256         LT_DIAG_LTHREAD_AFFINITY,       /* 11 mask 0x00000800 */
 257         LT_DIAG_LTHREAD_TMR_START,      /* 12 mask 0x00001000 */
 258         LT_DIAG_LTHREAD_TMR_DELETE,     /* 13 mask 0x00002000 */
 259         LT_DIAG_LTHREAD_TMR_EXPIRED,    /* 14 mask 0x00004000 */
 260         /* bits 15 - 19 conditional variable flag group */
 261         LT_DIAG_COND_CREATE,            /* 15 mask 0x00008000 */
 262         LT_DIAG_COND_DESTROY,           /* 16 mask 0x00010000 */
 263         LT_DIAG_COND_WAIT,              /* 17 mask 0x00020000 */
 264         LT_DIAG_COND_SIGNAL,            /* 18 mask 0x00040000 */
 265         LT_DIAG_COND_BROADCAST,         /* 19 mask 0x00080000 */
 266         /* bits 20 - 25 mutex flag group */
 267         LT_DIAG_MUTEX_CREATE,           /* 20 mask 0x00100000 */
 268         LT_DIAG_MUTEX_DESTROY,          /* 21 mask 0x00200000 */
 269         LT_DIAG_MUTEX_LOCK,             /* 22 mask 0x00400000 */
 270         LT_DIAG_MUTEX_TRYLOCK,          /* 23 mask 0x00800000 */
 271         LT_DIAG_MUTEX_BLOCKED,          /* 24 mask 0x01000000 */
 272         LT_DIAG_MUTEX_UNLOCKED,         /* 25 mask 0x02000000 */
 273         /* bits 26 - 27 scheduler flag group - 8 bits */
 274         LT_DIAG_SCHED_CREATE,           /* 26 mask 0x04000000 */
 275         LT_DIAG_SCHED_SHUTDOWN,         /* 27 mask 0x08000000 */
 276         LT_DIAG_EVENT_MAX
 277 };
 278
 279 #define LT_DIAG_ALL 0xffffffffffffffff
 280
 281
 282 /*
 283  * Display scheduler stats
 284  */
 285 void
 286 lthread_sched_stats_display(void);
 287
 288 /*
 289  * return the diagnostic ref val stored in a condition var
 290  */
 291 uint64_t
 292 lthread_cond_diag_ref(struct lthread_cond *c);
 293
 294 /*
 295  * return the diagnostic ref val stored in a mutex
 296  */
 297 uint64_t
 298 lthread_mutex_diag_ref(struct lthread_mutex *m);
 299
 300 #ifdef __cplusplus
 301 }
 302 #endif
 303
 304 #endif                          /* LTHREAD_DIAG_API_H_ */