1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2012, Intel Corporation.
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 "../../../include/linux/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[CFS_TCD_TYPE_MAX] = {
45 80, /* 80% pages for CFS_TCD_TYPE_PROC */
46 10, /* 10% pages for CFS_TCD_TYPE_SOFTIRQ */
47 10 /* 10% pages for CFS_TCD_TYPE_IRQ */
48 };
49
50 char *cfs_trace_console_buffers[NR_CPUS][CFS_TCD_TYPE_MAX];
51
52 struct rw_semaphore cfs_tracefile_sem;
53
cfs_tracefile_init_arch(void)54 int cfs_tracefile_init_arch(void)
55 {
56 int i;
57 int j;
58 struct cfs_trace_cpu_data *tcd;
59
60 init_rwsem(&cfs_tracefile_sem);
61
62 /* initialize trace_data */
63 memset(cfs_trace_data, 0, sizeof(cfs_trace_data));
64 for (i = 0; i < CFS_TCD_TYPE_MAX; i++) {
65 cfs_trace_data[i] =
66 kmalloc(sizeof(union cfs_trace_data_union) *
67 num_possible_cpus(), GFP_KERNEL);
68 if (cfs_trace_data[i] == NULL)
69 goto out;
70
71 }
72
73 /* arch related info initialized */
74 cfs_tcd_for_each(tcd, i, j) {
75 spin_lock_init(&tcd->tcd_lock);
76 tcd->tcd_pages_factor = pages_factor[i];
77 tcd->tcd_type = i;
78 tcd->tcd_cpu = j;
79 }
80
81 for (i = 0; i < num_possible_cpus(); i++)
82 for (j = 0; j < 3; j++) {
83 cfs_trace_console_buffers[i][j] =
84 kmalloc(CFS_TRACE_CONSOLE_BUFFER_SIZE,
85 GFP_KERNEL);
86
87 if (cfs_trace_console_buffers[i][j] == NULL)
88 goto out;
89 }
90
91 return 0;
92
93 out:
94 cfs_tracefile_fini_arch();
95 printk(KERN_ERR "lnet: Not enough memory\n");
96 return -ENOMEM;
97 }
98
cfs_tracefile_fini_arch(void)99 void cfs_tracefile_fini_arch(void)
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 (cfs_trace_console_buffers[i][j] != NULL) {
107 kfree(cfs_trace_console_buffers[i][j]);
108 cfs_trace_console_buffers[i][j] = NULL;
109 }
110
111 for (i = 0; cfs_trace_data[i] != NULL; i++) {
112 kfree(cfs_trace_data[i]);
113 cfs_trace_data[i] = NULL;
114 }
115 }
116
cfs_tracefile_read_lock(void)117 void cfs_tracefile_read_lock(void)
118 {
119 down_read(&cfs_tracefile_sem);
120 }
121
cfs_tracefile_read_unlock(void)122 void cfs_tracefile_read_unlock(void)
123 {
124 up_read(&cfs_tracefile_sem);
125 }
126
cfs_tracefile_write_lock(void)127 void cfs_tracefile_write_lock(void)
128 {
129 down_write(&cfs_tracefile_sem);
130 }
131
cfs_tracefile_write_unlock(void)132 void cfs_tracefile_write_unlock(void)
133 {
134 up_write(&cfs_tracefile_sem);
135 }
136
cfs_trace_buf_idx_get(void)137 cfs_trace_buf_type_t cfs_trace_buf_idx_get(void)
138 {
139 if (in_irq())
140 return CFS_TCD_TYPE_IRQ;
141 else if (in_softirq())
142 return CFS_TCD_TYPE_SOFTIRQ;
143 else
144 return CFS_TCD_TYPE_PROC;
145 }
146
147 /*
148 * The walking argument indicates the locking comes from all tcd types
149 * iterator and we must lock it and dissable local irqs to avoid deadlocks
150 * with other interrupt locks that might be happening. See LU-1311
151 * for details.
152 */
cfs_trace_lock_tcd(struct cfs_trace_cpu_data * tcd,int walking)153 int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
154 __acquires(&tcd->tc_lock)
155 {
156 __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
157 if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
158 spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags);
159 else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
160 spin_lock_bh(&tcd->tcd_lock);
161 else if (unlikely(walking))
162 spin_lock_irq(&tcd->tcd_lock);
163 else
164 spin_lock(&tcd->tcd_lock);
165 return 1;
166 }
167
cfs_trace_unlock_tcd(struct cfs_trace_cpu_data * tcd,int walking)168 void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
169 __releases(&tcd->tcd_lock)
170 {
171 __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
172 if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
173 spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags);
174 else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
175 spin_unlock_bh(&tcd->tcd_lock);
176 else if (unlikely(walking))
177 spin_unlock_irq(&tcd->tcd_lock);
178 else
179 spin_unlock(&tcd->tcd_lock);
180 }
181
cfs_tcd_owns_tage(struct cfs_trace_cpu_data * tcd,struct cfs_trace_page * tage)182 int cfs_tcd_owns_tage(struct cfs_trace_cpu_data *tcd,
183 struct cfs_trace_page *tage)
184 {
185 /*
186 * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
187 * from here: this will lead to infinite recursion.
188 */
189 return tcd->tcd_cpu == tage->cpu;
190 }
191
192 void
cfs_set_ptldebug_header(struct ptldebug_header * header,struct libcfs_debug_msg_data * msgdata,unsigned long stack)193 cfs_set_ptldebug_header(struct ptldebug_header *header,
194 struct libcfs_debug_msg_data *msgdata,
195 unsigned long stack)
196 {
197 struct timeval tv;
198
199 do_gettimeofday(&tv);
200
201 header->ph_subsys = msgdata->msg_subsys;
202 header->ph_mask = msgdata->msg_mask;
203 header->ph_cpu_id = smp_processor_id();
204 header->ph_type = cfs_trace_buf_idx_get();
205 header->ph_sec = (__u32)tv.tv_sec;
206 header->ph_usec = tv.tv_usec;
207 header->ph_stack = stack;
208 header->ph_pid = current->pid;
209 header->ph_line_num = msgdata->msg_line;
210 header->ph_extern_pid = 0;
211 return;
212 }
213
214 static char *
dbghdr_to_err_string(struct ptldebug_header * hdr)215 dbghdr_to_err_string(struct ptldebug_header *hdr)
216 {
217 switch (hdr->ph_subsys) {
218
219 case S_LND:
220 case S_LNET:
221 return "LNetError";
222 default:
223 return "LustreError";
224 }
225 }
226
227 static char *
dbghdr_to_info_string(struct ptldebug_header * hdr)228 dbghdr_to_info_string(struct ptldebug_header *hdr)
229 {
230 switch (hdr->ph_subsys) {
231
232 case S_LND:
233 case S_LNET:
234 return "LNet";
235 default:
236 return "Lustre";
237 }
238 }
239
cfs_print_to_console(struct ptldebug_header * hdr,int mask,const char * buf,int len,const char * file,const char * fn)240 void cfs_print_to_console(struct ptldebug_header *hdr, int mask,
241 const char *buf, int len, const char *file,
242 const char *fn)
243 {
244 char *prefix = "Lustre", *ptype = NULL;
245
246 if ((mask & D_EMERG) != 0) {
247 prefix = dbghdr_to_err_string(hdr);
248 ptype = KERN_EMERG;
249 } else if ((mask & D_ERROR) != 0) {
250 prefix = dbghdr_to_err_string(hdr);
251 ptype = KERN_ERR;
252 } else if ((mask & D_WARNING) != 0) {
253 prefix = dbghdr_to_info_string(hdr);
254 ptype = KERN_WARNING;
255 } else if ((mask & (D_CONSOLE | libcfs_printk)) != 0) {
256 prefix = dbghdr_to_info_string(hdr);
257 ptype = KERN_INFO;
258 }
259
260 if ((mask & D_CONSOLE) != 0) {
261 printk("%s%s: %.*s", ptype, prefix, len, buf);
262 } else {
263 printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix,
264 hdr->ph_pid, hdr->ph_extern_pid, file, hdr->ph_line_num,
265 fn, len, buf);
266 }
267 return;
268 }
269
cfs_trace_max_debug_mb(void)270 int cfs_trace_max_debug_mb(void)
271 {
272 int total_mb = (totalram_pages >> (20 - PAGE_SHIFT));
273
274 return max(512, (total_mb * 80)/100);
275 }
276