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[fs/lustre-release.git] / libcfs / libcfs / linux / linux-tracefile.c
1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=8:tabstop=8:
3  *
4  * GPL HEADER START
5  *
6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 only,
10  * as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License version 2 for more details (a copy is included
16  * in the LICENSE file that accompanied this code).
17  *
18  * You should have received a copy of the GNU General Public License
19  * version 2 along with this program; If not, see
20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
21  *
22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23  * CA 95054 USA or visit www.sun.com if you need additional information or
24  * have any questions.
25  *
26  * GPL HEADER END
27  */
28 /*
29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
30  * Use is subject to license terms.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  */
36
37 #define DEBUG_SUBSYSTEM S_LNET
38 #define LUSTRE_TRACEFILE_PRIVATE
39
40 #include <libcfs/libcfs.h>
41 #include "tracefile.h"
42
43 /* percents to share the total debug memory for each type */
44 static unsigned int pages_factor[TCD_TYPE_MAX] = {
45         80,  /* 80% pages for TCD_TYPE_PROC */
46         10,  /* 10% pages for TCD_TYPE_SOFTIRQ */
47         10   /* 10% pages for TCD_TYPE_IRQ */
48 };
49
50 char *trace_console_buffers[NR_CPUS][TCD_TYPE_MAX];
51
52 struct rw_semaphore tracefile_sem;
53
54 int tracefile_init_arch()
55 {
56         int    i;
57         int    j;
58         struct trace_cpu_data *tcd;
59
60         init_rwsem(&tracefile_sem);
61
62         /* initialize trace_data */
63         memset(trace_data, 0, sizeof(trace_data));
64         for (i = 0; i < TCD_TYPE_MAX; i++) {
65                 trace_data[i]=kmalloc(sizeof(union trace_data_union)*NR_CPUS,
66                                                           GFP_KERNEL);
67                 if (trace_data[i] == NULL)
68                         goto out;
69
70         }
71
72         /* arch related info initialized */
73         tcd_for_each(tcd, i, j) {
74                 spin_lock_init(&tcd->tcd_lock);
75                 tcd->tcd_pages_factor = pages_factor[i];
76                 tcd->tcd_type = i;
77                 tcd->tcd_cpu = j;
78         }
79
80         for (i = 0; i < num_possible_cpus(); i++)
81                 for (j = 0; j < 3; j++) {
82                         trace_console_buffers[i][j] =
83                                 kmalloc(TRACE_CONSOLE_BUFFER_SIZE,
84                                         GFP_KERNEL);
85
86                         if (trace_console_buffers[i][j] == NULL)
87                                 goto out;
88                 }
89
90         return 0;
91
92 out:
93         tracefile_fini_arch();
94         printk(KERN_ERR "lnet: No enough memory\n");
95         return -ENOMEM;
96
97 }
98
99 void tracefile_fini_arch()
100 {
101         int    i;
102         int    j;
103
104         for (i = 0; i < num_possible_cpus(); i++)
105                 for (j = 0; j < 3; j++)
106                         if (trace_console_buffers[i][j] != NULL) {
107                                 kfree(trace_console_buffers[i][j]);
108                                 trace_console_buffers[i][j] = NULL;
109                         }
110
111         for (i = 0; trace_data[i] != NULL; i++) {
112                 kfree(trace_data[i]);
113                 trace_data[i] = NULL;
114         }
115
116         fini_rwsem(&tracefile_sem);
117 }
118
119 void tracefile_read_lock()
120 {
121         down_read(&tracefile_sem);
122 }
123
124 void tracefile_read_unlock()
125 {
126         up_read(&tracefile_sem);
127 }
128
129 void tracefile_write_lock()
130 {
131         down_write(&tracefile_sem);
132 }
133
134 void tracefile_write_unlock()
135 {
136         up_write(&tracefile_sem);
137 }
138
139 trace_buf_type_t
140 trace_buf_idx_get()
141 {
142         if (in_irq())
143                 return TCD_TYPE_IRQ;
144         else if (in_softirq())
145                 return TCD_TYPE_SOFTIRQ;
146         else
147                 return TCD_TYPE_PROC;
148 }
149
150 int trace_lock_tcd(struct trace_cpu_data *tcd)
151 {
152         __LASSERT(tcd->tcd_type < TCD_TYPE_MAX);
153
154         spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags);
155
156         return 1;
157 }
158
159 void trace_unlock_tcd(struct trace_cpu_data *tcd)
160 {
161         __LASSERT(tcd->tcd_type < TCD_TYPE_MAX);
162
163         spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags);
164 }
165
166 int tcd_owns_tage(struct trace_cpu_data *tcd, struct trace_page *tage)
167 {
168         /*
169          * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
170          * from here: this will lead to infinite recursion.
171          */
172         return tcd->tcd_cpu == tage->cpu;
173 }
174
175 void
176 set_ptldebug_header(struct ptldebug_header *header, int subsys, int mask,
177                     const int line, unsigned long stack)
178 {
179         struct timeval tv;
180
181         do_gettimeofday(&tv);
182
183         header->ph_subsys = subsys;
184         header->ph_mask = mask;
185         header->ph_cpu_id = smp_processor_id();
186         header->ph_sec = (__u32)tv.tv_sec;
187         header->ph_usec = tv.tv_usec;
188         header->ph_stack = stack;
189         header->ph_pid = current->pid;
190         header->ph_line_num = line;
191 #if defined(__arch_um__) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,20))
192         header->ph_extern_pid = current->thread.extern_pid;
193 #elif defined(__arch_um__) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
194         header->ph_extern_pid = current->thread.mode.tt.extern_pid;
195 #else
196         header->ph_extern_pid = 0;
197 #endif
198         return;
199 }
200
201 void print_to_console(struct ptldebug_header *hdr, int mask, const char *buf,
202                              int len, const char *file, const char *fn)
203 {
204         char *prefix = "Lustre", *ptype = NULL;
205
206         if ((mask & D_EMERG) != 0) {
207                 prefix = "LustreError";
208                 ptype = KERN_EMERG;
209         } else if ((mask & D_ERROR) != 0) {
210                 prefix = "LustreError";
211                 ptype = KERN_ERR;
212         } else if ((mask & D_WARNING) != 0) {
213                 prefix = "Lustre";
214                 ptype = KERN_WARNING;
215         } else if ((mask & (D_CONSOLE | libcfs_printk)) != 0) {
216                 prefix = "Lustre";
217                 ptype = KERN_INFO;
218         }
219
220         if ((mask & D_CONSOLE) != 0) {
221                 printk("%s%s: %.*s", ptype, prefix, len, buf);
222         } else {
223                 printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix, hdr->ph_pid,
224                        hdr->ph_extern_pid, file, hdr->ph_line_num, fn, len, buf);
225         }
226         return;
227 }
228
229 int trace_max_debug_mb(void)
230 {
231         int  total_mb = (num_physpages >> (20 - CFS_PAGE_SHIFT));
232         
233         return MAX(512, (total_mb * 80)/100);
234 }