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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 #ifndef get_cpu
44 #define get_cpu() smp_processor_id()
45 #define put_cpu() do { } while (0)
46 #endif
47
48 /* three types of trace_data in linux */
49 enum {
50         TCD_TYPE_PROC = 0,
51         TCD_TYPE_SOFTIRQ,
52         TCD_TYPE_IRQ,
53         TCD_TYPE_MAX
54 };
55
56 /* percents to share the total debug memory for each type */
57 static unsigned int pages_factor[TCD_TYPE_MAX] = {
58         80,  /* 80% pages for TCD_TYPE_PROC */
59         10,  /* 10% pages for TCD_TYPE_SOFTIRQ */
60         10   /* 10% pages for TCD_TYPE_IRQ */
61 };
62
63 char *trace_console_buffers[NR_CPUS][3];
64
65 struct rw_semaphore tracefile_sem;
66
67 int tracefile_init_arch()
68 {
69         int    i;
70         int    j;
71         struct trace_cpu_data *tcd;
72
73         init_rwsem(&tracefile_sem);
74
75         /* initialize trace_data */
76         memset(trace_data, 0, sizeof(trace_data));
77         for (i = 0; i < TCD_TYPE_MAX; i++) {
78                 trace_data[i]=kmalloc(sizeof(union trace_data_union)*NR_CPUS,
79                                                           GFP_KERNEL);
80                 if (trace_data[i] == NULL)
81                         goto out;
82
83         }
84
85         /* arch related info initialized */
86         tcd_for_each(tcd, i, j) {
87                 spin_lock_init(&tcd->tcd_lock);
88                 tcd->tcd_pages_factor = pages_factor[i];
89                 tcd->tcd_type = i;
90                 tcd->tcd_cpu = j;
91         }
92
93         for (i = 0; i < num_possible_cpus(); i++)
94                 for (j = 0; j < 3; j++) {
95                         trace_console_buffers[i][j] =
96                                 kmalloc(TRACE_CONSOLE_BUFFER_SIZE,
97                                         GFP_KERNEL);
98
99                         if (trace_console_buffers[i][j] == NULL)
100                                 goto out;
101                 }
102
103         return 0;
104
105 out:
106         tracefile_fini_arch();
107         printk(KERN_ERR "lnet: No enough memory\n");
108         return -ENOMEM;
109
110 }
111
112 void tracefile_fini_arch()
113 {
114         int    i;
115         int    j;
116
117         for (i = 0; i < num_possible_cpus(); i++)
118                 for (j = 0; j < 3; j++)
119                         if (trace_console_buffers[i][j] != NULL) {
120                                 kfree(trace_console_buffers[i][j]);
121                                 trace_console_buffers[i][j] = NULL;
122                         }
123
124         for (i = 0; trace_data[i] != NULL; i++) {
125                 kfree(trace_data[i]);
126                 trace_data[i] = NULL;
127         }
128
129         fini_rwsem(&tracefile_sem);
130 }
131
132 void tracefile_read_lock()
133 {
134         down_read(&tracefile_sem);
135 }
136
137 void tracefile_read_unlock()
138 {
139         up_read(&tracefile_sem);
140 }
141
142 void tracefile_write_lock()
143 {
144         down_write(&tracefile_sem);
145 }
146
147 void tracefile_write_unlock()
148 {
149         up_write(&tracefile_sem);
150 }
151
152 char *
153 trace_get_console_buffer(void)
154 {
155         int  cpu = get_cpu();
156         int  idx;
157
158         if (in_irq()) {
159                 idx = 0;
160         } else if (in_softirq()) {
161                 idx = 1;
162         } else {
163                 idx = 2;
164         }
165
166         return trace_console_buffers[cpu][idx];
167 }
168
169 void
170 trace_put_console_buffer(char *buffer)
171 {
172         put_cpu();
173 }
174
175 struct trace_cpu_data *
176 trace_get_tcd(void)
177 {
178         struct trace_cpu_data *tcd;
179         int cpu;
180
181         cpu = get_cpu();
182         if (in_irq())
183                 tcd = &(*trace_data[TCD_TYPE_IRQ])[cpu].tcd;
184         else if (in_softirq())
185                 tcd = &(*trace_data[TCD_TYPE_SOFTIRQ])[cpu].tcd;
186         else
187                 tcd = &(*trace_data[TCD_TYPE_PROC])[cpu].tcd;
188
189         trace_lock_tcd(tcd);
190
191         return tcd;
192 }
193
194 void
195 trace_put_tcd (struct trace_cpu_data *tcd)
196 {
197         trace_unlock_tcd(tcd);
198
199         put_cpu();
200 }
201
202 int trace_lock_tcd(struct trace_cpu_data *tcd)
203 {
204         __LASSERT(tcd->tcd_type < TCD_TYPE_MAX);
205
206         spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags);
207
208         return 1;
209 }
210
211 void trace_unlock_tcd(struct trace_cpu_data *tcd)
212 {
213         __LASSERT(tcd->tcd_type < TCD_TYPE_MAX);
214
215         spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags);
216 }
217
218 int tcd_owns_tage(struct trace_cpu_data *tcd, struct trace_page *tage)
219 {
220         /*
221          * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
222          * from here: this will lead to infinite recursion.
223          */
224         return tcd->tcd_cpu == tage->cpu;
225 }
226
227 void
228 set_ptldebug_header(struct ptldebug_header *header, int subsys, int mask,
229                     const int line, unsigned long stack)
230 {
231         struct timeval tv;
232
233         do_gettimeofday(&tv);
234
235         header->ph_subsys = subsys;
236         header->ph_mask = mask;
237         header->ph_cpu_id = smp_processor_id();
238         header->ph_sec = (__u32)tv.tv_sec;
239         header->ph_usec = tv.tv_usec;
240         header->ph_stack = stack;
241         header->ph_pid = current->pid;
242         header->ph_line_num = line;
243 #if defined(__arch_um__) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,20))
244         header->ph_extern_pid = current->thread.extern_pid;
245 #elif defined(__arch_um__) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
246         header->ph_extern_pid = current->thread.mode.tt.extern_pid;
247 #else
248         header->ph_extern_pid = 0;
249 #endif
250         return;
251 }
252
253 void print_to_console(struct ptldebug_header *hdr, int mask, const char *buf,
254                              int len, const char *file, const char *fn)
255 {
256         char *prefix = "Lustre", *ptype = NULL;
257
258         if ((mask & D_EMERG) != 0) {
259                 prefix = "LustreError";
260                 ptype = KERN_EMERG;
261         } else if ((mask & D_ERROR) != 0) {
262                 prefix = "LustreError";
263                 ptype = KERN_ERR;
264         } else if ((mask & D_WARNING) != 0) {
265                 prefix = "Lustre";
266                 ptype = KERN_WARNING;
267         } else if ((mask & (D_CONSOLE | libcfs_printk)) != 0) {
268                 prefix = "Lustre";
269                 ptype = KERN_INFO;
270         }
271
272         if ((mask & D_CONSOLE) != 0) {
273                 printk("%s%s: %.*s", ptype, prefix, len, buf);
274         } else {
275                 printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix, hdr->ph_pid,
276                        hdr->ph_extern_pid, file, hdr->ph_line_num, fn, len, buf);
277         }
278         return;
279 }
280
281 int trace_max_debug_mb(void)
282 {
283         int  total_mb = (num_physpages >> (20 - CFS_PAGE_SHIFT));
284         
285         return MAX(512, (total_mb * 80)/100);
286 }