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, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 1994-2003 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29/*
30 * Includes
31 */
32
33#include <sys/types.h>
34#include <sys/param.h>
35#include <sys/debug.h>
36#include <sys/tnf.h>
37#include <sys/thread.h>
38#include <sys/dtrace.h>
39
40#include "tnf_buf.h"
41#include "tnf_types.h"
42#include "tnf_trace.h"
43
44#ifndef NPROBE
45
46/*
47 * Globals
48 */
49
50size_t tnf_trace_file_size = TNF_TRACE_FILE_DEFAULT;
51
52/*
53 * tnf_trace_on
54 */
55void
56tnf_trace_on(void)
57{
58	TNFW_B_UNSET_STOPPED(tnfw_b_state);
59	tnf_tracing_active = 1;
60	dtrace_vtime_enable_tnf();
61	/* Enable system call tracing for all processes */
62	set_all_proc_sys();
63}
64
65/*
66 * tnf_trace_off
67 */
68void
69tnf_trace_off(void)
70{
71	TNFW_B_SET_STOPPED(tnfw_b_state);
72	dtrace_vtime_disable_tnf();
73	tnf_tracing_active = 0;
74	/* System call tracing is automatically disabled */
75}
76
77/*
78 * tnf_trace_init
79 * 	Not reentrant: only called from tnf_allocbuf(), which is
80 *	single-threaded.
81 */
82void
83tnf_trace_init(void)
84{
85	int stopped;
86	tnf_ops_t *ops;
87
88	ASSERT(tnf_buf != NULL);
89	ASSERT(!tnf_tracing_active);
90
91	stopped = tnfw_b_state & TNFW_B_STOPPED;
92
93	/*
94	 * Initialize the buffer
95	 */
96	tnfw_b_init_buffer(tnf_buf, tnf_trace_file_size);
97
98	/*
99	 * Mark allocator running (not stopped). Luckily,
100	 * tnf_trace_alloc() first checks tnf_tracing_active, so no
101	 * trace data will be written.
102	 */
103	tnfw_b_state = TNFW_B_RUNNING;
104
105	/*
106	 * 1195835: Write out some tags now.  The stopped bit needs
107	 * to be clear while we do this.
108	 */
109	/* LINTED pointer cast may result in improper alignment */
110	if ((ops = (tnf_ops_t *)curthread->t_tnf_tpdp) != NULL) {
111		tnf_tag_data_t	*tag;
112		TNFW_B_POS	*pos;
113
114		ASSERT(!LOCK_HELD(&ops->busy));
115		LOCK_INIT_HELD(&ops->busy); /* XXX save a call */
116
117		tag = TAG_DATA(tnf_struct_type);
118		(void) tag->tag_desc(ops, tag);
119		tag = TAG_DATA(tnf_probe_type);
120		(void) tag->tag_desc(ops, tag);
121		tag = TAG_DATA(tnf_kernel_schedule);
122		(void) tag->tag_desc(ops, tag);
123
124		pos = &ops->wcb.tnfw_w_tag_pos;
125		TNFW_B_COMMIT(pos);
126		pos = &ops->wcb.tnfw_w_pos;
127		TNFW_B_ROLLBACK(pos);
128
129		LOCK_INIT_CLEAR(&ops->busy); /* XXX save a call */
130	}
131
132	/* Restore stopped bit */
133	tnfw_b_state |= stopped;
134}
135
136#endif /* NPROBE */
137