usr/src/uts/common/sys/clock_tick.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 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _SYS_CLOCK_TICK_H
  28 #define _SYS_CLOCK_TICK_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include <sys/types.h>
  33 #include <sys/mutex.h>
  34 #include <sys/cpuvar.h>
  35 #include <sys/systm.h>
  36 #include <sys/cyclic.h>
  37
  38 #ifdef  __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 #define CLOCK_TICK_NCPUS        32
  43
  44 /*
  45  * Per-CPU structure to facilitate multi-threaded tick accounting.
  46  *
  47  * ct_lock
  48  *      Mutex for the structure. Used to lock the structure to pass
  49  *      arguments to the tick processing softint handler.
  50  * ct_intr
  51  *      Tick processing softint handle. For parallelism, each CPU
  52  *      needs to have its own softint handle.
  53  * ct_lbolt
  54  *      Copy of the lbolt at the time of tick scheduling.
  55  * ct_pending
  56  *      Number of ticks to be processed by one invocation of the tick
  57  *      processing softint.
  58  * ct_start
  59  *      First CPU to do tick processing for.
  60  * ct_end
  61  *      Last CPU to do tick processing for.
  62  * ct_scan
  63  *      CPU to start the tick processing from. Rotated every tick.
  64  */
  65 typedef struct clock_tick_cpu {
  66         kmutex_t                ct_lock;
  67         ulong_t                 ct_intr;
  68         clock_t                 ct_lbolt;
  69         int                     ct_pending;
  70         int                     ct_start;
  71         int                     ct_end;
  72         int                     ct_scan;
  73 } clock_tick_cpu_t;
  74
  75 /*
  76  * Per-set structure to facilitate multi-threaded tick accounting.
  77  * clock_tick_lock protects this.
  78  *
  79  * ct_start
  80  *      First CPU to do tick processing for.
  81  * ct_end
  82  *      Last CPU to do tick processing for.
  83  * ct_scan
  84  *      CPU to start the tick processing from. Rotated every tick.
  85  */
  86 typedef struct clock_tick_set {
  87         int                     ct_start;
  88         int                     ct_end;
  89         int                     ct_scan;
  90 } clock_tick_set_t;
  91
  92 #define CLOCK_TICK_CPU_OFFLINE(cp)      \
  93         (((cp) != cpu_active) && ((cp)->cpu_next_onln == (cp)))
  94
  95 #define CLOCK_TICK_XCALL_SAFE(cp)       \
  96                 CPU_IN_SET(clock_tick_online_cpuset, cp->cpu_id)
  97
  98 #define CLOCK_TICK_PROC_MAX             10
  99
 100 #ifdef  _KERNEL
 101 #pragma weak            create_softint
 102 extern ulong_t          create_softint(uint_t, uint_t (*)(caddr_t, caddr_t),
 103                                 caddr_t);
 104 #pragma weak            invoke_softint
 105 extern void             invoke_softint(processorid_t, ulong_t);
 106 #pragma weak            sync_softint
 107 extern void             sync_softint(cpuset_t);
 108 extern void             clock_tick(kthread_t *, int);
 109 extern void             membar_sync(void);
 110
 111 extern int              hires_tick;
 112 #endif  /* _KERNEL */
 113
 114 #ifdef  __cplusplus
 115 }
 116 #endif
 117
 118 #endif /* _SYS_CLOCK_TICK_H */