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
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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 #if defined(__linux__)
43 #include "linux/linux-tracefile.h"
44 #elif defined(__WINNT__)
45 #include "winnt/winnt-tracefile.h"
47 #error Unsupported operating system.
50 /* trace file lock routines */
52 #define TRACEFILE_NAME_SIZE 1024
53 extern char tracefile[TRACEFILE_NAME_SIZE];
54 extern long long tracefile_size;
56 extern void libcfs_run_debug_log_upcall(char *file);
58 int tracefile_init_arch(void);
59 void tracefile_fini_arch(void);
61 void tracefile_read_lock(void);
62 void tracefile_read_unlock(void);
63 void tracefile_write_lock(void);
64 void tracefile_write_unlock(void);
66 int tracefile_dump_all_pages(char *filename);
67 void trace_debug_print(void);
68 void trace_flush_pages(void);
69 int trace_start_thread(void);
70 void trace_stop_thread(void);
71 int tracefile_init(int max_pages);
72 void tracefile_exit(void);
76 int trace_copyin_string(char *knl_buffer, int knl_buffer_nob,
77 const char *usr_buffer, int usr_buffer_nob);
78 int trace_copyout_string(char *usr_buffer, int usr_buffer_nob,
79 const char *knl_str, char *append);
80 int trace_allocate_string_buffer(char **str, int nob);
81 void trace_free_string_buffer(char *str, int nob);
82 int trace_dump_debug_buffer_usrstr(void *usr_str, int usr_str_nob);
83 int trace_daemon_command(char *str);
84 int trace_daemon_command_usrstr(void *usr_str, int usr_str_nob);
85 int trace_set_debug_mb(int mb);
86 int trace_set_debug_mb_usrstr(void *usr_str, int usr_str_nob);
87 int trace_get_debug_mb(void);
89 extern void libcfs_debug_dumplog_internal(void *arg);
90 extern void libcfs_register_panic_notifier(void);
91 extern void libcfs_unregister_panic_notifier(void);
92 extern int libcfs_panic_in_progress;
93 extern int trace_max_debug_mb(void);
95 #define TCD_MAX_PAGES (5 << (20 - CFS_PAGE_SHIFT))
96 #define TCD_STOCK_PAGES (TCD_MAX_PAGES)
97 #define TRACEFILE_SIZE (500 << 20)
99 #ifdef LUSTRE_TRACEFILE_PRIVATE
102 * Private declare for tracefile
104 #define TCD_MAX_PAGES (5 << (20 - CFS_PAGE_SHIFT))
105 #define TCD_STOCK_PAGES (TCD_MAX_PAGES)
107 #define TRACEFILE_SIZE (500 << 20)
109 /* Size of a buffer for sprinting console messages if we can't get a page
111 #define TRACE_CONSOLE_BUFFER_SIZE 1024
113 union trace_data_union {
114 struct trace_cpu_data {
116 * Even though this structure is meant to be per-CPU, locking
117 * is needed because in some places the data may be accessed
118 * from other CPUs. This lock is directly used in trace_get_tcd
119 * and trace_put_tcd, which are called in libcfs_debug_vmsg2 and
120 * tcd_for_each_type_lock
123 unsigned long tcd_lock_flags;
126 * pages with trace records not yet processed by tracefiled.
128 struct list_head tcd_pages;
129 /* number of pages on ->tcd_pages */
130 unsigned long tcd_cur_pages;
133 * pages with trace records already processed by
134 * tracefiled. These pages are kept in memory, so that some
135 * portion of log can be written in the event of LBUG. This
136 * list is maintained in LRU order.
138 * Pages are moved to ->tcd_daemon_pages by tracefiled()
139 * (put_pages_on_daemon_list()). LRU pages from this list are
140 * discarded when list grows too large.
142 struct list_head tcd_daemon_pages;
143 /* number of pages on ->tcd_daemon_pages */
144 unsigned long tcd_cur_daemon_pages;
147 * Maximal number of pages allowed on ->tcd_pages and
148 * ->tcd_daemon_pages each.
149 * Always TCD_MAX_PAGES * tcd_pages_factor / 100 in current
152 unsigned long tcd_max_pages;
155 * preallocated pages to write trace records into. Pages from
156 * ->tcd_stock_pages are moved to ->tcd_pages by
157 * portals_debug_msg().
159 * This list is necessary, because on some platforms it's
160 * impossible to perform efficient atomic page allocation in a
161 * non-blockable context.
163 * Such platforms fill ->tcd_stock_pages "on occasion", when
164 * tracing code is entered in blockable context.
166 * trace_get_tage_try() tries to get a page from
167 * ->tcd_stock_pages first and resorts to atomic page
168 * allocation only if this queue is empty. ->tcd_stock_pages
169 * is replenished when tracing code is entered in blocking
170 * context (darwin-tracefile.c:trace_get_tcd()). We try to
171 * maintain TCD_STOCK_PAGES (40 by default) pages in this
172 * queue. Atomic allocation is only required if more than
173 * TCD_STOCK_PAGES pagesful are consumed by trace records all
174 * emitted in non-blocking contexts. Which is quite unlikely.
176 struct list_head tcd_stock_pages;
177 /* number of pages on ->tcd_stock_pages */
178 unsigned long tcd_cur_stock_pages;
180 unsigned short tcd_shutting_down;
181 unsigned short tcd_cpu;
182 unsigned short tcd_type;
183 /* The factors to share debug memory. */
184 unsigned short tcd_pages_factor;
186 char __pad[L1_CACHE_ALIGN(sizeof(struct trace_cpu_data))];
189 #define TCD_MAX_TYPES 8
190 extern union trace_data_union (*trace_data[TCD_MAX_TYPES])[NR_CPUS];
192 #define tcd_for_each(tcd, i, j) \
193 for (i = 0; trace_data[i] != NULL; i++) \
194 for (j = 0, ((tcd) = &(*trace_data[i])[j].tcd); \
195 j < num_possible_cpus(); j++, (tcd) = &(*trace_data[i])[j].tcd)
197 #define tcd_for_each_type_lock(tcd, i, cpu) \
198 for (i = 0; trace_data[i] && \
199 (tcd = &(*trace_data[i])[cpu].tcd) && \
200 trace_lock_tcd(tcd); trace_unlock_tcd(tcd), i++)
202 /* XXX nikita: this declaration is internal to tracefile.c and should probably
204 struct page_collection {
205 struct list_head pc_pages;
207 * spin-lock protecting ->pc_pages. It is taken by smp_call_function()
208 * call-back functions. XXX nikita: Which is horrible: all processors
209 * receive NMI at the same time only to be serialized by this
210 * lock. Probably ->pc_pages should be replaced with an array of
211 * NR_CPUS elements accessed locklessly.
215 * if this flag is set, collect_pages() will spill both
216 * ->tcd_daemon_pages and ->tcd_pages to the ->pc_pages. Otherwise,
217 * only ->tcd_pages are spilled.
219 int pc_want_daemon_pages;
222 /* XXX nikita: this declaration is internal to tracefile.c and should probably
224 struct tracefiled_ctl {
225 struct completion tctl_start;
226 struct completion tctl_stop;
227 cfs_waitq_t tctl_waitq;
229 atomic_t tctl_shutdown;
233 * small data-structure for each page owned by tracefiled.
235 /* XXX nikita: this declaration is internal to tracefile.c and should probably
243 * linkage into one of the lists in trace_data_union or
246 struct list_head linkage;
248 * number of bytes used within this page
252 * cpu that owns this page
256 * type(context) of this page
261 extern void set_ptldebug_header(struct ptldebug_header *header,
262 int subsys, int mask, const int line,
263 unsigned long stack);
264 extern void print_to_console(struct ptldebug_header *hdr, int mask, const char *buf,
265 int len, const char *file, const char *fn);
267 extern int trace_lock_tcd(struct trace_cpu_data *tcd);
268 extern void trace_unlock_tcd(struct trace_cpu_data *tcd);
271 * trace_buf_type_t, trace_buf_idx_get() and trace_console_buffers[][]
272 * are not public libcfs API; they should be defined in
273 * platform-specific tracefile include files
274 * (see, for example, linux-tracefile.h).
277 extern char *trace_console_buffers[NR_CPUS][TCD_TYPE_MAX];
278 extern trace_buf_type_t trace_buf_idx_get(void);
281 trace_get_console_buffer(void)
283 return trace_console_buffers[cfs_get_cpu()][trace_buf_idx_get()];
287 trace_put_console_buffer(char *buffer)
292 extern union trace_data_union (*trace_data[TCD_MAX_TYPES])[NR_CPUS];
294 static inline struct trace_cpu_data *
297 struct trace_cpu_data *tcd =
298 &(*trace_data[trace_buf_idx_get()])[cfs_get_cpu()].tcd;
306 trace_put_tcd (struct trace_cpu_data *tcd)
308 trace_unlock_tcd(tcd);
313 int trace_refill_stock(struct trace_cpu_data *tcd, int gfp,
314 struct list_head *stock);
317 int tcd_owns_tage(struct trace_cpu_data *tcd, struct trace_page *tage);
319 extern void trace_assertion_failed(const char *str, const char *fn,
320 const char *file, int line);
322 /* ASSERTION that is safe to use within the debug system */
323 #define __LASSERT(cond) \
325 if (unlikely(!(cond))) { \
326 trace_assertion_failed("ASSERTION("#cond") failed", \
327 __FUNCTION__, __FILE__, __LINE__); \
331 #define __LASSERT_TAGE_INVARIANT(tage) \
333 __LASSERT(tage != NULL); \
334 __LASSERT(tage->page != NULL); \
335 __LASSERT(tage->used <= CFS_PAGE_SIZE); \
336 __LASSERT(cfs_page_count(tage->page) > 0); \
339 #endif /* LUSTRE_TRACEFILE_PRIVATE */
341 #endif /* __LIBCFS_TRACEFILE_H__ */