4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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
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
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_LNET
38 #define LUSTRE_TRACEFILE_PRIVATE
40 #include "../../../include/linux/libcfs/libcfs.h"
41 #include "../tracefile.h"
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 */
50 char *cfs_trace_console_buffers
[NR_CPUS
][CFS_TCD_TYPE_MAX
];
52 static DECLARE_RWSEM(cfs_tracefile_sem
);
54 int cfs_tracefile_init_arch(void)
58 struct cfs_trace_cpu_data
*tcd
;
60 /* initialize trace_data */
61 memset(cfs_trace_data
, 0, sizeof(cfs_trace_data
));
62 for (i
= 0; i
< CFS_TCD_TYPE_MAX
; i
++) {
64 kmalloc(sizeof(union cfs_trace_data_union
) *
65 num_possible_cpus(), GFP_KERNEL
);
66 if (!cfs_trace_data
[i
])
71 /* arch related info initialized */
72 cfs_tcd_for_each(tcd
, i
, j
) {
73 spin_lock_init(&tcd
->tcd_lock
);
74 tcd
->tcd_pages_factor
= pages_factor
[i
];
79 for (i
= 0; i
< num_possible_cpus(); i
++)
80 for (j
= 0; j
< 3; j
++) {
81 cfs_trace_console_buffers
[i
][j
] =
82 kmalloc(CFS_TRACE_CONSOLE_BUFFER_SIZE
,
85 if (!cfs_trace_console_buffers
[i
][j
])
92 cfs_tracefile_fini_arch();
93 printk(KERN_ERR
"lnet: Not enough memory\n");
97 void cfs_tracefile_fini_arch(void)
102 for (i
= 0; i
< num_possible_cpus(); i
++)
103 for (j
= 0; j
< 3; j
++) {
104 kfree(cfs_trace_console_buffers
[i
][j
]);
105 cfs_trace_console_buffers
[i
][j
] = NULL
;
108 for (i
= 0; cfs_trace_data
[i
]; i
++) {
109 kfree(cfs_trace_data
[i
]);
110 cfs_trace_data
[i
] = NULL
;
114 void cfs_tracefile_read_lock(void)
116 down_read(&cfs_tracefile_sem
);
119 void cfs_tracefile_read_unlock(void)
121 up_read(&cfs_tracefile_sem
);
124 void cfs_tracefile_write_lock(void)
126 down_write(&cfs_tracefile_sem
);
129 void cfs_tracefile_write_unlock(void)
131 up_write(&cfs_tracefile_sem
);
134 cfs_trace_buf_type_t
cfs_trace_buf_idx_get(void)
137 return CFS_TCD_TYPE_IRQ
;
138 else if (in_softirq())
139 return CFS_TCD_TYPE_SOFTIRQ
;
141 return CFS_TCD_TYPE_PROC
;
145 * The walking argument indicates the locking comes from all tcd types
146 * iterator and we must lock it and dissable local irqs to avoid deadlocks
147 * with other interrupt locks that might be happening. See LU-1311
150 int cfs_trace_lock_tcd(struct cfs_trace_cpu_data
*tcd
, int walking
)
151 __acquires(&tcd
->tc_lock
)
153 __LASSERT(tcd
->tcd_type
< CFS_TCD_TYPE_MAX
);
154 if (tcd
->tcd_type
== CFS_TCD_TYPE_IRQ
)
155 spin_lock_irqsave(&tcd
->tcd_lock
, tcd
->tcd_lock_flags
);
156 else if (tcd
->tcd_type
== CFS_TCD_TYPE_SOFTIRQ
)
157 spin_lock_bh(&tcd
->tcd_lock
);
158 else if (unlikely(walking
))
159 spin_lock_irq(&tcd
->tcd_lock
);
161 spin_lock(&tcd
->tcd_lock
);
165 void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data
*tcd
, int walking
)
166 __releases(&tcd
->tcd_lock
)
168 __LASSERT(tcd
->tcd_type
< CFS_TCD_TYPE_MAX
);
169 if (tcd
->tcd_type
== CFS_TCD_TYPE_IRQ
)
170 spin_unlock_irqrestore(&tcd
->tcd_lock
, tcd
->tcd_lock_flags
);
171 else if (tcd
->tcd_type
== CFS_TCD_TYPE_SOFTIRQ
)
172 spin_unlock_bh(&tcd
->tcd_lock
);
173 else if (unlikely(walking
))
174 spin_unlock_irq(&tcd
->tcd_lock
);
176 spin_unlock(&tcd
->tcd_lock
);
180 cfs_set_ptldebug_header(struct ptldebug_header
*header
,
181 struct libcfs_debug_msg_data
*msgdata
,
184 struct timespec64 ts
;
186 ktime_get_real_ts64(&ts
);
188 header
->ph_subsys
= msgdata
->msg_subsys
;
189 header
->ph_mask
= msgdata
->msg_mask
;
190 header
->ph_cpu_id
= smp_processor_id();
191 header
->ph_type
= cfs_trace_buf_idx_get();
192 /* y2038 safe since all user space treats this as unsigned, but
193 * will overflow in 2106 */
194 header
->ph_sec
= (u32
)ts
.tv_sec
;
195 header
->ph_usec
= ts
.tv_nsec
/ NSEC_PER_USEC
;
196 header
->ph_stack
= stack
;
197 header
->ph_pid
= current
->pid
;
198 header
->ph_line_num
= msgdata
->msg_line
;
199 header
->ph_extern_pid
= 0;
204 dbghdr_to_err_string(struct ptldebug_header
*hdr
)
206 switch (hdr
->ph_subsys
) {
211 return "LustreError";
216 dbghdr_to_info_string(struct ptldebug_header
*hdr
)
218 switch (hdr
->ph_subsys
) {
227 void cfs_print_to_console(struct ptldebug_header
*hdr
, int mask
,
228 const char *buf
, int len
, const char *file
,
231 char *prefix
= "Lustre", *ptype
= NULL
;
233 if ((mask
& D_EMERG
) != 0) {
234 prefix
= dbghdr_to_err_string(hdr
);
236 } else if ((mask
& D_ERROR
) != 0) {
237 prefix
= dbghdr_to_err_string(hdr
);
239 } else if ((mask
& D_WARNING
) != 0) {
240 prefix
= dbghdr_to_info_string(hdr
);
241 ptype
= KERN_WARNING
;
242 } else if ((mask
& (D_CONSOLE
| libcfs_printk
)) != 0) {
243 prefix
= dbghdr_to_info_string(hdr
);
247 if ((mask
& D_CONSOLE
) != 0) {
248 printk("%s%s: %.*s", ptype
, prefix
, len
, buf
);
250 printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype
, prefix
,
251 hdr
->ph_pid
, hdr
->ph_extern_pid
, file
, hdr
->ph_line_num
,
257 int cfs_trace_max_debug_mb(void)
259 int total_mb
= (totalram_pages
>> (20 - PAGE_SHIFT
));
261 return max(512, (total_mb
* 80) / 100);