1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see [sun.com URL with a
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
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #ifndef __LIBCFS_TRACEFILE_H__
38 #define __LIBCFS_TRACEFILE_H__
40 #include <libcfs/libcfs.h>
42 /* trace file lock routines */
44 #define TRACEFILE_NAME_SIZE 1024
45 extern char tracefile[TRACEFILE_NAME_SIZE];
46 extern long long tracefile_size;
48 int tracefile_init_arch(void);
49 void tracefile_fini_arch(void);
51 void tracefile_read_lock(void);
52 void tracefile_read_unlock(void);
53 void tracefile_write_lock(void);
54 void tracefile_write_unlock(void);
56 int tracefile_dump_all_pages(char *filename);
57 void trace_debug_print(void);
58 void trace_flush_pages(void);
59 int trace_start_thread(void);
60 void trace_stop_thread(void);
61 int tracefile_init(int max_pages);
62 void tracefile_exit(void);
66 int trace_copyin_string(char *knl_buffer, int knl_buffer_nob,
67 const char *usr_buffer, int usr_buffer_nob);
68 int trace_copyout_string(char *usr_buffer, int usr_buffer_nob,
69 const char *knl_str, char *append);
70 int trace_allocate_string_buffer(char **str, int nob);
71 void trace_free_string_buffer(char *str, int nob);
72 int trace_dump_debug_buffer_usrstr(void *usr_str, int usr_str_nob);
73 int trace_daemon_command(char *str);
74 int trace_daemon_command_usrstr(void *usr_str, int usr_str_nob);
75 int trace_set_debug_mb(int mb);
76 int trace_set_debug_mb_usrstr(void *usr_str, int usr_str_nob);
77 int trace_get_debug_mb(void);
79 extern void libcfs_debug_dumplog_internal(void *arg);
80 extern void libcfs_register_panic_notifier(void);
81 extern void libcfs_unregister_panic_notifier(void);
82 extern int libcfs_panic_in_progress;
83 extern int trace_max_debug_mb(void);
85 #define TCD_MAX_PAGES (5 << (20 - CFS_PAGE_SHIFT))
86 #define TCD_STOCK_PAGES (TCD_MAX_PAGES)
87 #define TRACEFILE_SIZE (500 << 20)
89 #ifdef LUSTRE_TRACEFILE_PRIVATE
92 * Private declare for tracefile
94 #define TCD_MAX_PAGES (5 << (20 - CFS_PAGE_SHIFT))
95 #define TCD_STOCK_PAGES (TCD_MAX_PAGES)
97 #define TRACEFILE_SIZE (500 << 20)
99 /* Size of a buffer for sprinting console messages if we can't get a page
101 #define TRACE_CONSOLE_BUFFER_SIZE 1024
103 union trace_data_union {
104 struct trace_cpu_data {
106 * pages with trace records not yet processed by tracefiled.
108 struct list_head tcd_pages;
109 /* number of pages on ->tcd_pages */
110 unsigned long tcd_cur_pages;
113 * pages with trace records already processed by
114 * tracefiled. These pages are kept in memory, so that some
115 * portion of log can be written in the event of LBUG. This
116 * list is maintained in LRU order.
118 * Pages are moved to ->tcd_daemon_pages by tracefiled()
119 * (put_pages_on_daemon_list()). LRU pages from this list are
120 * discarded when list grows too large.
122 struct list_head tcd_daemon_pages;
123 /* number of pages on ->tcd_daemon_pages */
124 unsigned long tcd_cur_daemon_pages;
127 * Maximal number of pages allowed on ->tcd_pages and
128 * ->tcd_daemon_pages each.
129 * Always TCD_MAX_PAGES * tcd_pages_factor / 100 in current
132 unsigned long tcd_max_pages;
135 * preallocated pages to write trace records into. Pages from
136 * ->tcd_stock_pages are moved to ->tcd_pages by
137 * portals_debug_msg().
139 * This list is necessary, because on some platforms it's
140 * impossible to perform efficient atomic page allocation in a
141 * non-blockable context.
143 * Such platforms fill ->tcd_stock_pages "on occasion", when
144 * tracing code is entered in blockable context.
146 * trace_get_tage_try() tries to get a page from
147 * ->tcd_stock_pages first and resorts to atomic page
148 * allocation only if this queue is empty. ->tcd_stock_pages
149 * is replenished when tracing code is entered in blocking
150 * context (darwin-tracefile.c:trace_get_tcd()). We try to
151 * maintain TCD_STOCK_PAGES (40 by default) pages in this
152 * queue. Atomic allocation is only required if more than
153 * TCD_STOCK_PAGES pagesful are consumed by trace records all
154 * emitted in non-blocking contexts. Which is quite unlikely.
156 struct list_head tcd_stock_pages;
157 /* number of pages on ->tcd_stock_pages */
158 unsigned long tcd_cur_stock_pages;
160 unsigned short tcd_shutting_down;
161 unsigned short tcd_cpu;
162 unsigned short tcd_type;
163 /* The factors to share debug memory. */
164 unsigned short tcd_pages_factor;
166 char __pad[L1_CACHE_ALIGN(sizeof(struct trace_cpu_data))];
169 #define TCD_MAX_TYPES 8
170 extern union trace_data_union (*trace_data[TCD_MAX_TYPES])[NR_CPUS];
172 #define tcd_for_each(tcd, i, j) \
173 for (i = 0; trace_data[i] != NULL; i++) \
174 for (j = 0, ((tcd) = &(*trace_data[i])[j].tcd); \
175 j < num_possible_cpus(); j++, (tcd) = &(*trace_data[i])[j].tcd)
177 #define tcd_for_each_type_lock(tcd, i) \
178 for (i = 0; trace_data[i] && \
179 (tcd = &(*trace_data[i])[smp_processor_id()].tcd) && \
180 trace_lock_tcd(tcd); trace_unlock_tcd(tcd), i++)
182 /* XXX nikita: this declaration is internal to tracefile.c and should probably
184 struct page_collection {
185 struct list_head pc_pages;
187 * spin-lock protecting ->pc_pages. It is taken by smp_call_function()
188 * call-back functions. XXX nikita: Which is horrible: all processors
189 * receive NMI at the same time only to be serialized by this
190 * lock. Probably ->pc_pages should be replaced with an array of
191 * NR_CPUS elements accessed locklessly.
195 * if this flag is set, collect_pages() will spill both
196 * ->tcd_daemon_pages and ->tcd_pages to the ->pc_pages. Otherwise,
197 * only ->tcd_pages are spilled.
199 int pc_want_daemon_pages;
202 /* XXX nikita: this declaration is internal to tracefile.c and should probably
204 struct tracefiled_ctl {
205 struct completion tctl_start;
206 struct completion tctl_stop;
207 cfs_waitq_t tctl_waitq;
209 atomic_t tctl_shutdown;
213 * small data-structure for each page owned by tracefiled.
215 /* XXX nikita: this declaration is internal to tracefile.c and should probably
223 * linkage into one of the lists in trace_data_union or
226 struct list_head linkage;
228 * number of bytes used within this page
232 * cpu that owns this page
236 * type(context) of this page
241 extern void set_ptldebug_header(struct ptldebug_header *header,
242 int subsys, int mask, const int line,
243 unsigned long stack);
244 extern void print_to_console(struct ptldebug_header *hdr, int mask, const char *buf,
245 int len, const char *file, const char *fn);
247 extern struct trace_cpu_data *trace_get_tcd(void);
248 extern void trace_put_tcd(struct trace_cpu_data *tcd);
249 extern int trace_lock_tcd(struct trace_cpu_data *tcd);
250 extern void trace_unlock_tcd(struct trace_cpu_data *tcd);
251 extern char *trace_get_console_buffer(void);
252 extern void trace_put_console_buffer(char *buffer);
254 extern void trace_call_on_all_cpus(void (*fn)(void *arg), void *arg);
256 int trace_refill_stock(struct trace_cpu_data *tcd, int gfp,
257 struct list_head *stock);
260 int tcd_owns_tage(struct trace_cpu_data *tcd, struct trace_page *tage);
262 extern void trace_assertion_failed(const char *str, const char *fn,
263 const char *file, int line);
265 /* ASSERTION that is safe to use within the debug system */
266 #define __LASSERT(cond) \
268 if (unlikely(!(cond))) { \
269 trace_assertion_failed("ASSERTION("#cond") failed", \
270 __FUNCTION__, __FILE__, __LINE__); \
274 #define __LASSERT_TAGE_INVARIANT(tage) \
276 __LASSERT(tage != NULL); \
277 __LASSERT(tage->page != NULL); \
278 __LASSERT(tage->used <= CFS_PAGE_SIZE); \
279 __LASSERT(cfs_page_count(tage->page) > 0); \
282 #endif /* LUSTRE_TRACEFILE_PRIVATE */
284 #endif /* __LIBCFS_TRACEFILE_H__ */