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[fs/lustre-release.git] / libcfs / libcfs / tracefile.h
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 #ifndef __LIBCFS_TRACEFILE_H__
38 #define __LIBCFS_TRACEFILE_H__
39
40 #include <libcfs/libcfs.h>
41
42 typedef enum {
43         CFS_TCD_TYPE_PROC = 0,
44         CFS_TCD_TYPE_SOFTIRQ,
45         CFS_TCD_TYPE_IRQ,
46         CFS_TCD_TYPE_MAX
47 } cfs_trace_buf_type_t;
48
49 /* trace file lock routines */
50
51 #define TRACEFILE_NAME_SIZE 1024
52 extern char      cfs_tracefile[TRACEFILE_NAME_SIZE];
53 extern long long cfs_tracefile_size;
54
55 extern char lnet_upcall[1024];
56 /**
57  * The path of debug log dump upcall script.
58  */
59 extern char lnet_debug_log_upcall[1024];
60
61 extern void libcfs_run_debug_log_upcall(char *file);
62
63 int  cfs_tracefile_init_arch(void);
64 void cfs_tracefile_fini_arch(void);
65
66 void cfs_tracefile_read_lock(void);
67 void cfs_tracefile_read_unlock(void);
68 void cfs_tracefile_write_lock(void);
69 void cfs_tracefile_write_unlock(void);
70
71 int cfs_tracefile_dump_all_pages(char *filename);
72 void cfs_trace_debug_print(void);
73 void cfs_trace_flush_pages(void);
74 int cfs_trace_start_thread(void);
75 void cfs_trace_stop_thread(void);
76 int cfs_tracefile_init(int max_pages);
77 void cfs_tracefile_exit(void);
78
79
80
81 int cfs_trace_copyin_string(char *knl_buffer, int knl_buffer_nob,
82                             const char __user *usr_buffer, int usr_buffer_nob);
83 int cfs_trace_copyout_string(char __user *usr_buffer, int usr_buffer_nob,
84                              const char *knl_str, char *append);
85 int cfs_trace_allocate_string_buffer(char **str, int nob);
86 void cfs_trace_free_string_buffer(char *str, int nob);
87 int cfs_trace_dump_debug_buffer_usrstr(void __user *usr_str, int usr_str_nob);
88 int cfs_trace_daemon_command(char *str);
89 int cfs_trace_daemon_command_usrstr(void __user *usr_str, int usr_str_nob);
90 int cfs_trace_set_debug_mb(int mb);
91 int cfs_trace_set_debug_mb_usrstr(void __user *usr_str, int usr_str_nob);
92 int cfs_trace_get_debug_mb(void);
93
94 extern void libcfs_debug_dumplog_internal(void *arg);
95 extern void libcfs_register_panic_notifier(void);
96 extern void libcfs_unregister_panic_notifier(void);
97 extern int  libcfs_panic_in_progress;
98 extern int  cfs_trace_max_debug_mb(void);
99
100 extern struct mutex cfs_trace_thread_mutex;
101 extern struct rw_semaphore cfs_tracefile_sem;
102
103 #define TCD_MAX_PAGES (5 << (20 - PAGE_CACHE_SHIFT))
104 #define TCD_STOCK_PAGES (TCD_MAX_PAGES)
105 #define CFS_TRACEFILE_SIZE (500 << 20)
106
107 #ifdef LUSTRE_TRACEFILE_PRIVATE
108
109 /*
110  * Private declare for tracefile
111  */
112 #define TCD_MAX_PAGES (5 << (20 - PAGE_CACHE_SHIFT))
113 #define TCD_STOCK_PAGES (TCD_MAX_PAGES)
114
115 #define CFS_TRACEFILE_SIZE (500 << 20)
116
117 /* Size of a buffer for sprinting console messages if we can't get a page
118  * from system */
119 #define CFS_TRACE_CONSOLE_BUFFER_SIZE   1024
120
121 union cfs_trace_data_union {
122         struct cfs_trace_cpu_data {
123                 /*
124                  * Even though this structure is meant to be per-CPU, locking
125                  * is needed because in some places the data may be accessed
126                  * from other CPUs. This lock is directly used in trace_get_tcd
127                  * and trace_put_tcd, which are called in libcfs_debug_vmsg2 and
128                  * tcd_for_each_type_lock
129                  */
130                 spinlock_t              tcd_lock;
131                 unsigned long           tcd_lock_flags;
132
133                 /*
134                  * pages with trace records not yet processed by tracefiled.
135                  */
136                 struct list_head        tcd_pages;
137                 /* number of pages on ->tcd_pages */
138                 unsigned long           tcd_cur_pages;
139
140                 /*
141                  * pages with trace records already processed by
142                  * tracefiled. These pages are kept in memory, so that some
143                  * portion of log can be written in the event of LBUG. This
144                  * list is maintained in LRU order.
145                  *
146                  * Pages are moved to ->tcd_daemon_pages by tracefiled()
147                  * (put_pages_on_daemon_list()). LRU pages from this list are
148                  * discarded when list grows too large.
149                  */
150                 struct list_head        tcd_daemon_pages;
151                 /* number of pages on ->tcd_daemon_pages */
152                 unsigned long           tcd_cur_daemon_pages;
153
154                 /*
155                  * Maximal number of pages allowed on ->tcd_pages and
156                  * ->tcd_daemon_pages each.
157                  * Always TCD_MAX_PAGES * tcd_pages_factor / 100 in current
158                  * implementation.
159                  */
160                 unsigned long           tcd_max_pages;
161
162                 /*
163                  * preallocated pages to write trace records into. Pages from
164                  * ->tcd_stock_pages are moved to ->tcd_pages by
165                  * portals_debug_msg().
166                  *
167                  * This list is necessary, because on some platforms it's
168                  * impossible to perform efficient atomic page allocation in a
169                  * non-blockable context.
170                  *
171                  * Such platforms fill ->tcd_stock_pages "on occasion", when
172                  * tracing code is entered in blockable context.
173                  *
174                  * trace_get_tage_try() tries to get a page from
175                  * ->tcd_stock_pages first and resorts to atomic page
176                  * allocation only if this queue is empty. ->tcd_stock_pages
177                  * is replenished when tracing code is entered in blocking
178                  * context (darwin-tracefile.c:trace_get_tcd()). We try to
179                  * maintain TCD_STOCK_PAGES (40 by default) pages in this
180                  * queue. Atomic allocation is only required if more than
181                  * TCD_STOCK_PAGES pagesful are consumed by trace records all
182                  * emitted in non-blocking contexts. Which is quite unlikely.
183                  */
184                 struct list_head        tcd_stock_pages;
185                 /* number of pages on ->tcd_stock_pages */
186                 unsigned long           tcd_cur_stock_pages;
187
188                 unsigned short          tcd_shutting_down;
189                 unsigned short          tcd_cpu;
190                 unsigned short          tcd_type;
191                 /* The factors to share debug memory. */
192                 unsigned short          tcd_pages_factor;
193         } tcd;
194         char __pad[L1_CACHE_ALIGN(sizeof(struct cfs_trace_cpu_data))];
195 };
196
197 #define TCD_MAX_TYPES      8
198 extern union cfs_trace_data_union (*cfs_trace_data[TCD_MAX_TYPES])[NR_CPUS];
199
200 #define cfs_tcd_for_each(tcd, i, j)                                       \
201     for (i = 0; cfs_trace_data[i] != NULL; i++)                           \
202         for (j = 0, ((tcd) = &(*cfs_trace_data[i])[j].tcd);               \
203              j < num_possible_cpus();                                     \
204              j++, (tcd) = &(*cfs_trace_data[i])[j].tcd)
205
206 #define cfs_tcd_for_each_type_lock(tcd, i, cpu)                           \
207     for (i = 0; cfs_trace_data[i] &&                                      \
208          (tcd = &(*cfs_trace_data[i])[cpu].tcd) &&                        \
209          cfs_trace_lock_tcd(tcd, 1); cfs_trace_unlock_tcd(tcd, 1), i++)
210
211 /* XXX nikita: this declaration is internal to tracefile.c and should probably
212  * be moved there */
213 struct page_collection {
214         struct list_head        pc_pages;
215         /*
216          * if this flag is set, collect_pages() will spill both
217          * ->tcd_daemon_pages and ->tcd_pages to the ->pc_pages. Otherwise,
218          * only ->tcd_pages are spilled.
219          */
220         int                     pc_want_daemon_pages;
221 };
222
223 /* XXX nikita: this declaration is internal to tracefile.c and should probably
224  * be moved there */
225 struct tracefiled_ctl {
226         struct completion       tctl_start;
227         struct completion       tctl_stop;
228         wait_queue_head_t       tctl_waitq;
229         pid_t                   tctl_pid;
230         atomic_t                tctl_shutdown;
231 };
232
233 /*
234  * small data-structure for each page owned by tracefiled.
235  */
236 /* XXX nikita: this declaration is internal to tracefile.c and should probably
237  * be moved there */
238 struct cfs_trace_page {
239         /*
240          * page itself
241          */
242         struct page             *page;
243         /*
244          * linkage into one of the lists in trace_data_union or
245          * page_collection
246          */
247         struct list_head        linkage;
248         /*
249          * number of bytes used within this page
250          */
251         unsigned int            used;
252         /*
253          * cpu that owns this page
254          */
255         unsigned short          cpu;
256         /*
257          * type(context) of this page
258          */
259         unsigned short          type;
260 };
261
262 extern void cfs_set_ptldebug_header(struct ptldebug_header *header,
263                                     struct libcfs_debug_msg_data *m,
264                                     unsigned long stack);
265 extern void cfs_print_to_console(struct ptldebug_header *hdr, int mask,
266                                  const char *buf, int len, const char *file,
267                                  const char *fn);
268
269 extern int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking);
270 extern void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking);
271
272 extern char *cfs_trace_console_buffers[NR_CPUS][CFS_TCD_TYPE_MAX];
273 extern cfs_trace_buf_type_t cfs_trace_buf_idx_get(void);
274
275 static inline char *cfs_trace_get_console_buffer(void)
276 {
277         unsigned int i = get_cpu();
278         unsigned int j = cfs_trace_buf_idx_get();
279
280         return cfs_trace_console_buffers[i][j];
281 }
282
283 static inline void
284 cfs_trace_put_console_buffer(char *buffer)
285 {
286         put_cpu();
287 }
288
289 static inline struct cfs_trace_cpu_data *cfs_trace_get_tcd(void)
290 {
291         struct cfs_trace_cpu_data *tcd =
292                 &(*cfs_trace_data[cfs_trace_buf_idx_get()])[get_cpu()].tcd;
293
294         cfs_trace_lock_tcd(tcd, 0);
295
296         return tcd;
297 }
298
299 static inline void cfs_trace_put_tcd(struct cfs_trace_cpu_data *tcd)
300 {
301         cfs_trace_unlock_tcd(tcd, 0);
302         put_cpu();
303 }
304
305 int cfs_trace_refill_stock(struct cfs_trace_cpu_data *tcd, gfp_t gfp,
306                                 struct list_head *stock);
307
308
309 int cfs_tcd_owns_tage(struct cfs_trace_cpu_data *tcd,
310                       struct cfs_trace_page *tage);
311
312 extern void cfs_trace_assertion_failed(const char *str,
313                                        struct libcfs_debug_msg_data *m);
314
315 /* ASSERTION that is safe to use within the debug system */
316 #define __LASSERT(cond)                                                 \
317 do {                                                                    \
318         if (unlikely(!(cond))) {                                        \
319                 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_EMERG, NULL);     \
320                 cfs_trace_assertion_failed("ASSERTION("#cond") failed", \
321                                            &msgdata);                   \
322         }                                                               \
323 } while (0)
324
325 #define __LASSERT_TAGE_INVARIANT(tage)                                  \
326 do {                                                                    \
327         __LASSERT(tage != NULL);                                        \
328         __LASSERT(tage->page != NULL);                                  \
329         __LASSERT(tage->used <= PAGE_CACHE_SIZE);                         \
330         __LASSERT(page_count(tage->page) > 0);                      \
331 } while (0)
332
333 #endif  /* LUSTRE_TRACEFILE_PRIVATE */
334
335 #endif /* __LIBCFS_TRACEFILE_H__ */