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35 #ifndef __LIBCFS_TRACEFILE_H__
36 #define __LIBCFS_TRACEFILE_H__
38 #include <libcfs/libcfs.h>
40 #if defined(__linux__)
41 #include "linux/linux-tracefile.h"
42 #elif defined(__WINNT__)
43 #include "winnt/winnt-tracefile.h"
45 #error Unsupported operating system.
48 /* trace file lock routines */
50 #define TRACEFILE_NAME_SIZE 1024
51 extern char cfs_tracefile[TRACEFILE_NAME_SIZE];
52 extern long long cfs_tracefile_size;
54 extern void libcfs_run_debug_log_upcall(char *file);
56 int cfs_tracefile_init_arch(void);
57 void cfs_tracefile_fini_arch(void);
59 void cfs_tracefile_read_lock(void);
60 void cfs_tracefile_read_unlock(void);
61 void cfs_tracefile_write_lock(void);
62 void cfs_tracefile_write_unlock(void);
64 int cfs_tracefile_dump_all_pages(char *filename);
65 void cfs_trace_debug_print(void);
66 void cfs_trace_flush_pages(void);
67 int cfs_trace_start_thread(void);
68 void cfs_trace_stop_thread(void);
69 int cfs_tracefile_init(int max_pages);
70 void cfs_tracefile_exit(void);
74 int cfs_trace_copyin_string(char *knl_buffer, int knl_buffer_nob,
75 const char *usr_buffer, int usr_buffer_nob);
76 int cfs_trace_copyout_string(char *usr_buffer, int usr_buffer_nob,
77 const char *knl_str, char *append);
78 int cfs_trace_allocate_string_buffer(char **str, int nob);
79 void cfs_trace_free_string_buffer(char *str, int nob);
80 int cfs_trace_dump_debug_buffer_usrstr(void *usr_str, int usr_str_nob);
81 int cfs_trace_daemon_command(char *str);
82 int cfs_trace_daemon_command_usrstr(void *usr_str, int usr_str_nob);
83 int cfs_trace_set_debug_mb(int mb);
84 int cfs_trace_set_debug_mb_usrstr(void *usr_str, int usr_str_nob);
85 int cfs_trace_get_debug_mb(void);
87 extern void libcfs_debug_dumplog_internal(void *arg);
88 extern void libcfs_register_panic_notifier(void);
89 extern void libcfs_unregister_panic_notifier(void);
90 extern int libcfs_panic_in_progress;
91 extern int cfs_trace_max_debug_mb(void);
93 #define TCD_MAX_PAGES (5 << (20 - CFS_PAGE_SHIFT))
94 #define TCD_STOCK_PAGES (TCD_MAX_PAGES)
95 #define CFS_TRACEFILE_SIZE (500 << 20)
97 #ifdef LUSTRE_TRACEFILE_PRIVATE
100 * Private declare for tracefile
102 #define TCD_MAX_PAGES (5 << (20 - CFS_PAGE_SHIFT))
103 #define TCD_STOCK_PAGES (TCD_MAX_PAGES)
105 #define CFS_TRACEFILE_SIZE (500 << 20)
107 /* Size of a buffer for sprinting console messages if we can't get a page
109 #define CFS_TRACE_CONSOLE_BUFFER_SIZE 1024
111 union cfs_trace_data_union {
112 struct cfs_trace_cpu_data {
114 * Even though this structure is meant to be per-CPU, locking
115 * is needed because in some places the data may be accessed
116 * from other CPUs. This lock is directly used in trace_get_tcd
117 * and trace_put_tcd, which are called in libcfs_debug_vmsg2 and
118 * tcd_for_each_type_lock
121 unsigned long tcd_lock_flags;
124 * pages with trace records not yet processed by tracefiled.
126 cfs_list_t tcd_pages;
127 /* number of pages on ->tcd_pages */
128 unsigned long tcd_cur_pages;
131 * pages with trace records already processed by
132 * tracefiled. These pages are kept in memory, so that some
133 * portion of log can be written in the event of LBUG. This
134 * list is maintained in LRU order.
136 * Pages are moved to ->tcd_daemon_pages by tracefiled()
137 * (put_pages_on_daemon_list()). LRU pages from this list are
138 * discarded when list grows too large.
140 cfs_list_t tcd_daemon_pages;
141 /* number of pages on ->tcd_daemon_pages */
142 unsigned long tcd_cur_daemon_pages;
145 * Maximal number of pages allowed on ->tcd_pages and
146 * ->tcd_daemon_pages each.
147 * Always TCD_MAX_PAGES * tcd_pages_factor / 100 in current
150 unsigned long tcd_max_pages;
153 * preallocated pages to write trace records into. Pages from
154 * ->tcd_stock_pages are moved to ->tcd_pages by
155 * portals_debug_msg().
157 * This list is necessary, because on some platforms it's
158 * impossible to perform efficient atomic page allocation in a
159 * non-blockable context.
161 * Such platforms fill ->tcd_stock_pages "on occasion", when
162 * tracing code is entered in blockable context.
164 * trace_get_tage_try() tries to get a page from
165 * ->tcd_stock_pages first and resorts to atomic page
166 * allocation only if this queue is empty. ->tcd_stock_pages
167 * is replenished when tracing code is entered in blocking
168 * context (darwin-tracefile.c:trace_get_tcd()). We try to
169 * maintain TCD_STOCK_PAGES (40 by default) pages in this
170 * queue. Atomic allocation is only required if more than
171 * TCD_STOCK_PAGES pagesful are consumed by trace records all
172 * emitted in non-blocking contexts. Which is quite unlikely.
174 cfs_list_t tcd_stock_pages;
175 /* number of pages on ->tcd_stock_pages */
176 unsigned long tcd_cur_stock_pages;
178 unsigned short tcd_shutting_down;
179 unsigned short tcd_cpu;
180 unsigned short tcd_type;
181 /* The factors to share debug memory. */
182 unsigned short tcd_pages_factor;
184 char __pad[CFS_L1_CACHE_ALIGN(sizeof(struct cfs_trace_cpu_data))];
187 #define TCD_MAX_TYPES 8
188 extern union cfs_trace_data_union (*cfs_trace_data[TCD_MAX_TYPES])[CFS_NR_CPUS];
190 #define cfs_tcd_for_each(tcd, i, j) \
191 for (i = 0; cfs_trace_data[i] != NULL; i++) \
192 for (j = 0, ((tcd) = &(*cfs_trace_data[i])[j].tcd); \
193 j < cfs_num_possible_cpus(); \
194 j++, (tcd) = &(*cfs_trace_data[i])[j].tcd)
196 #define cfs_tcd_for_each_type_lock(tcd, i, cpu) \
197 for (i = 0; cfs_trace_data[i] && \
198 (tcd = &(*cfs_trace_data[i])[cpu].tcd) && \
199 cfs_trace_lock_tcd(tcd, 1); cfs_trace_unlock_tcd(tcd, 1), i++)
201 /* XXX nikita: this declaration is internal to tracefile.c and should probably
203 struct page_collection {
206 * spin-lock protecting ->pc_pages. It is taken by smp_call_function()
207 * call-back functions. XXX nikita: Which is horrible: all processors
208 * receive NMI at the same time only to be serialized by this
209 * lock. Probably ->pc_pages should be replaced with an array of
210 * NR_CPUS elements accessed locklessly.
214 * if this flag is set, collect_pages() will spill both
215 * ->tcd_daemon_pages and ->tcd_pages to the ->pc_pages. Otherwise,
216 * only ->tcd_pages are spilled.
218 int pc_want_daemon_pages;
221 /* XXX nikita: this declaration is internal to tracefile.c and should probably
223 struct tracefiled_ctl {
224 struct completion tctl_start;
225 struct completion tctl_stop;
226 cfs_waitq_t tctl_waitq;
228 cfs_atomic_t tctl_shutdown;
232 * small data-structure for each page owned by tracefiled.
234 /* XXX nikita: this declaration is internal to tracefile.c and should probably
236 struct cfs_trace_page {
242 * linkage into one of the lists in trace_data_union or
247 * number of bytes used within this page
251 * cpu that owns this page
255 * type(context) of this page
260 extern void cfs_set_ptldebug_header(struct ptldebug_header *header,
261 struct libcfs_debug_msg_data *m,
262 unsigned long stack);
263 extern void cfs_print_to_console(struct ptldebug_header *hdr, int mask,
264 const char *buf, int len, const char *file,
267 extern int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking);
268 extern void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking);
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 *cfs_trace_console_buffers[CFS_NR_CPUS][CFS_TCD_TYPE_MAX];
278 extern cfs_trace_buf_type_t cfs_trace_buf_idx_get(void);
281 cfs_trace_get_console_buffer(void)
283 unsigned int i = cfs_get_cpu();
284 unsigned int j = cfs_trace_buf_idx_get();
286 return cfs_trace_console_buffers[i][j];
290 cfs_trace_put_console_buffer(char *buffer)
295 static inline struct cfs_trace_cpu_data *
296 cfs_trace_get_tcd(void)
298 struct cfs_trace_cpu_data *tcd =
299 &(*cfs_trace_data[cfs_trace_buf_idx_get()])[cfs_get_cpu()].tcd;
301 cfs_trace_lock_tcd(tcd, 0);
307 cfs_trace_put_tcd (struct cfs_trace_cpu_data *tcd)
309 cfs_trace_unlock_tcd(tcd, 0);
314 int cfs_trace_refill_stock(struct cfs_trace_cpu_data *tcd, int gfp,
318 int cfs_tcd_owns_tage(struct cfs_trace_cpu_data *tcd,
319 struct cfs_trace_page *tage);
321 extern void cfs_trace_assertion_failed(const char *str,
322 struct libcfs_debug_msg_data *m);
324 /* ASSERTION that is safe to use within the debug system */
325 #define __LASSERT(cond) \
327 if (unlikely(!(cond))) { \
328 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_EMERG, NULL); \
329 cfs_trace_assertion_failed("ASSERTION("#cond") failed", \
334 #define __LASSERT_TAGE_INVARIANT(tage) \
336 __LASSERT(tage != NULL); \
337 __LASSERT(tage->page != NULL); \
338 __LASSERT(tage->used <= CFS_PAGE_SIZE); \
339 __LASSERT(cfs_page_count(tage->page) > 0); \
342 #endif /* LUSTRE_TRACEFILE_PRIVATE */
344 #endif /* __LIBCFS_TRACEFILE_H__ */