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.gnu.org/licenses/gpl-2.0.html
19 *
20 * GPL HEADER END
21 */
22 /*
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
25 *
26 * Copyright (c) 2012, Intel Corporation.
27 */
28 /*
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
31 */
32
33 #define DEBUG_SUBSYSTEM S_LNET
34 #define LUSTRE_TRACEFILE_PRIVATE
35
36 #include "../../../include/linux/libcfs/libcfs.h"
37 #include "../tracefile.h"
38
39 /* percents to share the total debug memory for each type */
40 static unsigned int pages_factor[CFS_TCD_TYPE_MAX] = {
41 80, /* 80% pages for CFS_TCD_TYPE_PROC */
42 10, /* 10% pages for CFS_TCD_TYPE_SOFTIRQ */
43 10 /* 10% pages for CFS_TCD_TYPE_IRQ */
44 };
45
46 char *cfs_trace_console_buffers[NR_CPUS][CFS_TCD_TYPE_MAX];
47
48 static DECLARE_RWSEM(cfs_tracefile_sem);
49
cfs_tracefile_init_arch(void)50 int cfs_tracefile_init_arch(void)
51 {
52 int i;
53 int j;
54 struct cfs_trace_cpu_data *tcd;
55
56 /* initialize trace_data */
57 memset(cfs_trace_data, 0, sizeof(cfs_trace_data));
58 for (i = 0; i < CFS_TCD_TYPE_MAX; i++) {
59 cfs_trace_data[i] =
60 kmalloc(sizeof(union cfs_trace_data_union) *
61 num_possible_cpus(), GFP_KERNEL);
62 if (!cfs_trace_data[i])
63 goto out;
64 }
65
66 /* arch related info initialized */
67 cfs_tcd_for_each(tcd, i, j) {
68 spin_lock_init(&tcd->tcd_lock);
69 tcd->tcd_pages_factor = pages_factor[i];
70 tcd->tcd_type = i;
71 tcd->tcd_cpu = j;
72 }
73
74 for (i = 0; i < num_possible_cpus(); i++)
75 for (j = 0; j < 3; j++) {
76 cfs_trace_console_buffers[i][j] =
77 kmalloc(CFS_TRACE_CONSOLE_BUFFER_SIZE,
78 GFP_KERNEL);
79
80 if (!cfs_trace_console_buffers[i][j])
81 goto out;
82 }
83
84 return 0;
85
86 out:
87 cfs_tracefile_fini_arch();
88 printk(KERN_ERR "lnet: Not enough memory\n");
89 return -ENOMEM;
90 }
91
cfs_tracefile_fini_arch(void)92 void cfs_tracefile_fini_arch(void)
93 {
94 int i;
95 int j;
96
97 for (i = 0; i < num_possible_cpus(); i++)
98 for (j = 0; j < 3; j++) {
99 kfree(cfs_trace_console_buffers[i][j]);
100 cfs_trace_console_buffers[i][j] = NULL;
101 }
102
103 for (i = 0; cfs_trace_data[i]; i++) {
104 kfree(cfs_trace_data[i]);
105 cfs_trace_data[i] = NULL;
106 }
107 }
108
cfs_tracefile_read_lock(void)109 void cfs_tracefile_read_lock(void)
110 {
111 down_read(&cfs_tracefile_sem);
112 }
113
cfs_tracefile_read_unlock(void)114 void cfs_tracefile_read_unlock(void)
115 {
116 up_read(&cfs_tracefile_sem);
117 }
118
cfs_tracefile_write_lock(void)119 void cfs_tracefile_write_lock(void)
120 {
121 down_write(&cfs_tracefile_sem);
122 }
123
cfs_tracefile_write_unlock(void)124 void cfs_tracefile_write_unlock(void)
125 {
126 up_write(&cfs_tracefile_sem);
127 }
128
cfs_trace_buf_idx_get(void)129 enum cfs_trace_buf_type cfs_trace_buf_idx_get(void)
130 {
131 if (in_irq())
132 return CFS_TCD_TYPE_IRQ;
133 if (in_softirq())
134 return CFS_TCD_TYPE_SOFTIRQ;
135 return CFS_TCD_TYPE_PROC;
136 }
137
138 /*
139 * The walking argument indicates the locking comes from all tcd types
140 * iterator and we must lock it and dissable local irqs to avoid deadlocks
141 * with other interrupt locks that might be happening. See LU-1311
142 * for details.
143 */
cfs_trace_lock_tcd(struct cfs_trace_cpu_data * tcd,int walking)144 int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
145 __acquires(&tcd->tc_lock)
146 {
147 __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
148 if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
149 spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags);
150 else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
151 spin_lock_bh(&tcd->tcd_lock);
152 else if (unlikely(walking))
153 spin_lock_irq(&tcd->tcd_lock);
154 else
155 spin_lock(&tcd->tcd_lock);
156 return 1;
157 }
158
cfs_trace_unlock_tcd(struct cfs_trace_cpu_data * tcd,int walking)159 void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
160 __releases(&tcd->tcd_lock)
161 {
162 __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
163 if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
164 spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags);
165 else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
166 spin_unlock_bh(&tcd->tcd_lock);
167 else if (unlikely(walking))
168 spin_unlock_irq(&tcd->tcd_lock);
169 else
170 spin_unlock(&tcd->tcd_lock);
171 }
172
173 void
cfs_set_ptldebug_header(struct ptldebug_header * header,struct libcfs_debug_msg_data * msgdata,unsigned long stack)174 cfs_set_ptldebug_header(struct ptldebug_header *header,
175 struct libcfs_debug_msg_data *msgdata,
176 unsigned long stack)
177 {
178 struct timespec64 ts;
179
180 ktime_get_real_ts64(&ts);
181
182 header->ph_subsys = msgdata->msg_subsys;
183 header->ph_mask = msgdata->msg_mask;
184 header->ph_cpu_id = smp_processor_id();
185 header->ph_type = cfs_trace_buf_idx_get();
186 /* y2038 safe since all user space treats this as unsigned, but
187 * will overflow in 2106
188 */
189 header->ph_sec = (u32)ts.tv_sec;
190 header->ph_usec = ts.tv_nsec / NSEC_PER_USEC;
191 header->ph_stack = stack;
192 header->ph_pid = current->pid;
193 header->ph_line_num = msgdata->msg_line;
194 header->ph_extern_pid = 0;
195 }
196
197 static char *
dbghdr_to_err_string(struct ptldebug_header * hdr)198 dbghdr_to_err_string(struct ptldebug_header *hdr)
199 {
200 switch (hdr->ph_subsys) {
201 case S_LND:
202 case S_LNET:
203 return "LNetError";
204 default:
205 return "LustreError";
206 }
207 }
208
209 static char *
dbghdr_to_info_string(struct ptldebug_header * hdr)210 dbghdr_to_info_string(struct ptldebug_header *hdr)
211 {
212 switch (hdr->ph_subsys) {
213 case S_LND:
214 case S_LNET:
215 return "LNet";
216 default:
217 return "Lustre";
218 }
219 }
220
cfs_print_to_console(struct ptldebug_header * hdr,int mask,const char * buf,int len,const char * file,const char * fn)221 void cfs_print_to_console(struct ptldebug_header *hdr, int mask,
222 const char *buf, int len, const char *file,
223 const char *fn)
224 {
225 char *prefix = "Lustre", *ptype = NULL;
226
227 if ((mask & D_EMERG) != 0) {
228 prefix = dbghdr_to_err_string(hdr);
229 ptype = KERN_EMERG;
230 } else if ((mask & D_ERROR) != 0) {
231 prefix = dbghdr_to_err_string(hdr);
232 ptype = KERN_ERR;
233 } else if ((mask & D_WARNING) != 0) {
234 prefix = dbghdr_to_info_string(hdr);
235 ptype = KERN_WARNING;
236 } else if ((mask & (D_CONSOLE | libcfs_printk)) != 0) {
237 prefix = dbghdr_to_info_string(hdr);
238 ptype = KERN_INFO;
239 }
240
241 if ((mask & D_CONSOLE) != 0) {
242 printk("%s%s: %.*s", ptype, prefix, len, buf);
243 } else {
244 printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix,
245 hdr->ph_pid, hdr->ph_extern_pid, file, hdr->ph_line_num,
246 fn, len, buf);
247 }
248 }
249
cfs_trace_max_debug_mb(void)250 int cfs_trace_max_debug_mb(void)
251 {
252 int total_mb = (totalram_pages >> (20 - PAGE_SHIFT));
253
254 return max(512, (total_mb * 80) / 100);
255 }
256