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      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 */
    119