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 50 size_t tnf_trace_file_size = TNF_TRACE_FILE_DEFAULT; 51 52 /* 53 * tnf_trace_on 54 */ 55 void 56 tnf_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 */ 68 void 69 tnf_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 */ 82 void 83 tnf_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