xref: /illumos-gate/usr/src/uts/common/tnf/trace_init.c (revision 7c478bd9)
1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate  * Copyright 1994-2003 Sun Microsystems, Inc.  All rights reserved.
24*7c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate  */
26*7c478bd9Sstevel@tonic-gate 
27*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
28*7c478bd9Sstevel@tonic-gate 
29*7c478bd9Sstevel@tonic-gate /*
30*7c478bd9Sstevel@tonic-gate  * Includes
31*7c478bd9Sstevel@tonic-gate  */
32*7c478bd9Sstevel@tonic-gate 
33*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
34*7c478bd9Sstevel@tonic-gate #include <sys/param.h>
35*7c478bd9Sstevel@tonic-gate #include <sys/debug.h>
36*7c478bd9Sstevel@tonic-gate #include <sys/tnf.h>
37*7c478bd9Sstevel@tonic-gate #include <sys/thread.h>
38*7c478bd9Sstevel@tonic-gate #include <sys/dtrace.h>
39*7c478bd9Sstevel@tonic-gate 
40*7c478bd9Sstevel@tonic-gate #include "tnf_buf.h"
41*7c478bd9Sstevel@tonic-gate #include "tnf_types.h"
42*7c478bd9Sstevel@tonic-gate #include "tnf_trace.h"
43*7c478bd9Sstevel@tonic-gate 
44*7c478bd9Sstevel@tonic-gate #ifndef NPROBE
45*7c478bd9Sstevel@tonic-gate 
46*7c478bd9Sstevel@tonic-gate /*
47*7c478bd9Sstevel@tonic-gate  * Globals
48*7c478bd9Sstevel@tonic-gate  */
49*7c478bd9Sstevel@tonic-gate 
50*7c478bd9Sstevel@tonic-gate size_t tnf_trace_file_size = TNF_TRACE_FILE_DEFAULT;
51*7c478bd9Sstevel@tonic-gate 
52*7c478bd9Sstevel@tonic-gate /*
53*7c478bd9Sstevel@tonic-gate  * tnf_trace_on
54*7c478bd9Sstevel@tonic-gate  */
55*7c478bd9Sstevel@tonic-gate void
tnf_trace_on(void)56*7c478bd9Sstevel@tonic-gate tnf_trace_on(void)
57*7c478bd9Sstevel@tonic-gate {
58*7c478bd9Sstevel@tonic-gate 	TNFW_B_UNSET_STOPPED(tnfw_b_state);
59*7c478bd9Sstevel@tonic-gate 	tnf_tracing_active = 1;
60*7c478bd9Sstevel@tonic-gate 	dtrace_vtime_enable_tnf();
61*7c478bd9Sstevel@tonic-gate 	/* Enable system call tracing for all processes */
62*7c478bd9Sstevel@tonic-gate 	set_all_proc_sys();
63*7c478bd9Sstevel@tonic-gate }
64*7c478bd9Sstevel@tonic-gate 
65*7c478bd9Sstevel@tonic-gate /*
66*7c478bd9Sstevel@tonic-gate  * tnf_trace_off
67*7c478bd9Sstevel@tonic-gate  */
68*7c478bd9Sstevel@tonic-gate void
tnf_trace_off(void)69*7c478bd9Sstevel@tonic-gate tnf_trace_off(void)
70*7c478bd9Sstevel@tonic-gate {
71*7c478bd9Sstevel@tonic-gate 	TNFW_B_SET_STOPPED(tnfw_b_state);
72*7c478bd9Sstevel@tonic-gate 	dtrace_vtime_disable_tnf();
73*7c478bd9Sstevel@tonic-gate 	tnf_tracing_active = 0;
74*7c478bd9Sstevel@tonic-gate 	/* System call tracing is automatically disabled */
75*7c478bd9Sstevel@tonic-gate }
76*7c478bd9Sstevel@tonic-gate 
77*7c478bd9Sstevel@tonic-gate /*
78*7c478bd9Sstevel@tonic-gate  * tnf_trace_init
79*7c478bd9Sstevel@tonic-gate  * 	Not reentrant: only called from tnf_allocbuf(), which is
80*7c478bd9Sstevel@tonic-gate  *	single-threaded.
81*7c478bd9Sstevel@tonic-gate  */
82*7c478bd9Sstevel@tonic-gate void
tnf_trace_init(void)83*7c478bd9Sstevel@tonic-gate tnf_trace_init(void)
84*7c478bd9Sstevel@tonic-gate {
85*7c478bd9Sstevel@tonic-gate 	int stopped;
86*7c478bd9Sstevel@tonic-gate 	tnf_ops_t *ops;
87*7c478bd9Sstevel@tonic-gate 
88*7c478bd9Sstevel@tonic-gate 	ASSERT(tnf_buf != NULL);
89*7c478bd9Sstevel@tonic-gate 	ASSERT(!tnf_tracing_active);
90*7c478bd9Sstevel@tonic-gate 
91*7c478bd9Sstevel@tonic-gate 	stopped = tnfw_b_state & TNFW_B_STOPPED;
92*7c478bd9Sstevel@tonic-gate 
93*7c478bd9Sstevel@tonic-gate 	/*
94*7c478bd9Sstevel@tonic-gate 	 * Initialize the buffer
95*7c478bd9Sstevel@tonic-gate 	 */
96*7c478bd9Sstevel@tonic-gate 	tnfw_b_init_buffer(tnf_buf, tnf_trace_file_size);
97*7c478bd9Sstevel@tonic-gate 
98*7c478bd9Sstevel@tonic-gate 	/*
99*7c478bd9Sstevel@tonic-gate 	 * Mark allocator running (not stopped). Luckily,
100*7c478bd9Sstevel@tonic-gate 	 * tnf_trace_alloc() first checks tnf_tracing_active, so no
101*7c478bd9Sstevel@tonic-gate 	 * trace data will be written.
102*7c478bd9Sstevel@tonic-gate 	 */
103*7c478bd9Sstevel@tonic-gate 	tnfw_b_state = TNFW_B_RUNNING;
104*7c478bd9Sstevel@tonic-gate 
105*7c478bd9Sstevel@tonic-gate 	/*
106*7c478bd9Sstevel@tonic-gate 	 * 1195835: Write out some tags now.  The stopped bit needs
107*7c478bd9Sstevel@tonic-gate 	 * to be clear while we do this.
108*7c478bd9Sstevel@tonic-gate 	 */
109*7c478bd9Sstevel@tonic-gate 	/* LINTED pointer cast may result in improper alignment */
110*7c478bd9Sstevel@tonic-gate 	if ((ops = (tnf_ops_t *)curthread->t_tnf_tpdp) != NULL) {
111*7c478bd9Sstevel@tonic-gate 		tnf_tag_data_t	*tag;
112*7c478bd9Sstevel@tonic-gate 		TNFW_B_POS	*pos;
113*7c478bd9Sstevel@tonic-gate 
114*7c478bd9Sstevel@tonic-gate 		ASSERT(!LOCK_HELD(&ops->busy));
115*7c478bd9Sstevel@tonic-gate 		LOCK_INIT_HELD(&ops->busy); /* XXX save a call */
116*7c478bd9Sstevel@tonic-gate 
117*7c478bd9Sstevel@tonic-gate 		tag = TAG_DATA(tnf_struct_type);
118*7c478bd9Sstevel@tonic-gate 		(void) tag->tag_desc(ops, tag);
119*7c478bd9Sstevel@tonic-gate 		tag = TAG_DATA(tnf_probe_type);
120*7c478bd9Sstevel@tonic-gate 		(void) tag->tag_desc(ops, tag);
121*7c478bd9Sstevel@tonic-gate 		tag = TAG_DATA(tnf_kernel_schedule);
122*7c478bd9Sstevel@tonic-gate 		(void) tag->tag_desc(ops, tag);
123*7c478bd9Sstevel@tonic-gate 
124*7c478bd9Sstevel@tonic-gate 		pos = &ops->wcb.tnfw_w_tag_pos;
125*7c478bd9Sstevel@tonic-gate 		TNFW_B_COMMIT(pos);
126*7c478bd9Sstevel@tonic-gate 		pos = &ops->wcb.tnfw_w_pos;
127*7c478bd9Sstevel@tonic-gate 		TNFW_B_ROLLBACK(pos);
128*7c478bd9Sstevel@tonic-gate 
129*7c478bd9Sstevel@tonic-gate 		LOCK_INIT_CLEAR(&ops->busy); /* XXX save a call */
130*7c478bd9Sstevel@tonic-gate 	}
131*7c478bd9Sstevel@tonic-gate 
132*7c478bd9Sstevel@tonic-gate 	/* Restore stopped bit */
133*7c478bd9Sstevel@tonic-gate 	tnfw_b_state |= stopped;
134*7c478bd9Sstevel@tonic-gate }
135*7c478bd9Sstevel@tonic-gate 
136*7c478bd9Sstevel@tonic-gate #endif /* NPROBE */
137