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 * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
28 */
29
30 #ifndef _SYS_CLOCK_TICK_H
31 #define _SYS_CLOCK_TICK_H
32
33 #include <sys/types.h>
34 #include <sys/mutex.h>
35 #include <sys/cpuvar.h>
36 #include <sys/systm.h>
37 #include <sys/cyclic.h>
38
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42
43 #define CLOCK_TICK_NCPUS 32
44
45 /*
46 * Per-CPU structure to facilitate multi-threaded tick accounting.
47 *
48 * ct_lock
49 * Mutex for the structure. Used to lock the structure to pass
50 * arguments to the tick processing softint handler.
51 * ct_intr
52 * Tick processing softint handle. For parallelism, each CPU
53 * needs to have its own softint handle.
54 * ct_lbolt
55 * Copy of the lbolt at the time of tick scheduling.
56 * ct_pending
57 * Number of ticks to be processed by one invocation of the tick
58 * processing softint.
59 * ct_start
60 * First CPU to do tick processing for.
61 * ct_end
62 * Last CPU to do tick processing for.
63 * ct_scan
64 * CPU to start the tick processing from. Rotated every tick.
65 */
66 typedef struct clock_tick_cpu {
67 kmutex_t ct_lock;
68 ulong_t ct_intr;
69 clock_t ct_lbolt;
70 int ct_pending;
71 int ct_start;
72 int ct_end;
73 int ct_scan;
74 } clock_tick_cpu_t;
75
76 /*
77 * Per-set structure to facilitate multi-threaded tick accounting.
78 * clock_tick_lock protects this.
79 *
80 * ct_start
81 * First CPU to do tick processing for.
82 * ct_end
83 * Last CPU to do tick processing for.
84 * ct_scan
85 * CPU to start the tick processing from. Rotated every tick.
86 */
87 typedef struct clock_tick_set {
88 int ct_start;
89 int ct_end;
90 int ct_scan;
91 } clock_tick_set_t;
92
93 #define CLOCK_TICK_CPU_OFFLINE(cp) \
94 (((cp) != cpu_active) && ((cp)->cpu_next_onln == (cp)))
95
96 #define CLOCK_TICK_XCALL_SAFE(cp) \
97 CPU_IN_SET(clock_tick_online_cpuset, cp->cpu_id)
98
99 #define CLOCK_TICK_PROC_MAX 10
100
101 #ifdef _KERNEL
102 #pragma weak create_softint
103 extern ulong_t create_softint(uint_t, uint_t (*)(caddr_t, caddr_t),
104 caddr_t);
105 #pragma weak invoke_softint
106 extern void invoke_softint(processorid_t, ulong_t);
107 #pragma weak sync_softint
108 extern void sync_softint(cpuset_t);
109 extern void clock_tick(kthread_t *, int);
110 extern void membar_sync(void);
111
112 extern volatile int hires_tick;
113 #endif /* _KERNEL */
114
115 #ifdef __cplusplus
116 }
117 #endif
118
119 #endif /* _SYS_CLOCK_TICK_H */