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37 #ifndef __LIBCFS_TRACEFILE_H__
38 #define __LIBCFS_TRACEFILE_H__
40 #include "../../include/linux/libcfs/libcfs.h"
43 CFS_TCD_TYPE_PROC = 0,
47 } cfs_trace_buf_type_t;
49 /* trace file lock routines */
51 #define TRACEFILE_NAME_SIZE 1024
52 extern char cfs_tracefile[TRACEFILE_NAME_SIZE];
53 extern long long cfs_tracefile_size;
55 void libcfs_run_debug_log_upcall(char *file);
57 int cfs_tracefile_init_arch(void);
58 void cfs_tracefile_fini_arch(void);
60 void cfs_tracefile_read_lock(void);
61 void cfs_tracefile_read_unlock(void);
62 void cfs_tracefile_write_lock(void);
63 void cfs_tracefile_write_unlock(void);
65 int cfs_tracefile_dump_all_pages(char *filename);
66 void cfs_trace_debug_print(void);
67 void cfs_trace_flush_pages(void);
68 int cfs_trace_start_thread(void);
69 void cfs_trace_stop_thread(void);
70 int cfs_tracefile_init(int max_pages);
71 void cfs_tracefile_exit(void);
73 int cfs_trace_copyin_string(char *knl_buffer, int knl_buffer_nob,
74 const char __user *usr_buffer, int usr_buffer_nob);
75 int cfs_trace_copyout_string(char __user *usr_buffer, int usr_buffer_nob,
76 const char *knl_str, char *append);
77 int cfs_trace_allocate_string_buffer(char **str, int nob);
78 int cfs_trace_dump_debug_buffer_usrstr(void __user *usr_str, int usr_str_nob);
79 int cfs_trace_daemon_command(char *str);
80 int cfs_trace_daemon_command_usrstr(void __user *usr_str, int usr_str_nob);
81 int cfs_trace_set_debug_mb(int mb);
82 int cfs_trace_get_debug_mb(void);
84 void libcfs_debug_dumplog_internal(void *arg);
85 void libcfs_register_panic_notifier(void);
86 void libcfs_unregister_panic_notifier(void);
87 extern int libcfs_panic_in_progress;
88 int cfs_trace_max_debug_mb(void);
90 #define TCD_MAX_PAGES (5 << (20 - PAGE_CACHE_SHIFT))
91 #define TCD_STOCK_PAGES (TCD_MAX_PAGES)
92 #define CFS_TRACEFILE_SIZE (500 << 20)
94 #ifdef LUSTRE_TRACEFILE_PRIVATE
97 * Private declare for tracefile
99 #define TCD_MAX_PAGES (5 << (20 - PAGE_CACHE_SHIFT))
100 #define TCD_STOCK_PAGES (TCD_MAX_PAGES)
102 #define CFS_TRACEFILE_SIZE (500 << 20)
104 /* Size of a buffer for sprinting console messages if we can't get a page
106 #define CFS_TRACE_CONSOLE_BUFFER_SIZE 1024
108 union cfs_trace_data_union {
109 struct cfs_trace_cpu_data {
111 * Even though this structure is meant to be per-CPU, locking
112 * is needed because in some places the data may be accessed
113 * from other CPUs. This lock is directly used in trace_get_tcd
114 * and trace_put_tcd, which are called in libcfs_debug_vmsg2 and
115 * tcd_for_each_type_lock
118 unsigned long tcd_lock_flags;
121 * pages with trace records not yet processed by tracefiled.
123 struct list_head tcd_pages;
124 /* number of pages on ->tcd_pages */
125 unsigned long tcd_cur_pages;
128 * pages with trace records already processed by
129 * tracefiled. These pages are kept in memory, so that some
130 * portion of log can be written in the event of LBUG. This
131 * list is maintained in LRU order.
133 * Pages are moved to ->tcd_daemon_pages by tracefiled()
134 * (put_pages_on_daemon_list()). LRU pages from this list are
135 * discarded when list grows too large.
137 struct list_head tcd_daemon_pages;
138 /* number of pages on ->tcd_daemon_pages */
139 unsigned long tcd_cur_daemon_pages;
142 * Maximal number of pages allowed on ->tcd_pages and
143 * ->tcd_daemon_pages each.
144 * Always TCD_MAX_PAGES * tcd_pages_factor / 100 in current
147 unsigned long tcd_max_pages;
150 * preallocated pages to write trace records into. Pages from
151 * ->tcd_stock_pages are moved to ->tcd_pages by
152 * portals_debug_msg().
154 * This list is necessary, because on some platforms it's
155 * impossible to perform efficient atomic page allocation in a
156 * non-blockable context.
158 * Such platforms fill ->tcd_stock_pages "on occasion", when
159 * tracing code is entered in blockable context.
161 * trace_get_tage_try() tries to get a page from
162 * ->tcd_stock_pages first and resorts to atomic page
163 * allocation only if this queue is empty. ->tcd_stock_pages
164 * is replenished when tracing code is entered in blocking
165 * context (darwin-tracefile.c:trace_get_tcd()). We try to
166 * maintain TCD_STOCK_PAGES (40 by default) pages in this
167 * queue. Atomic allocation is only required if more than
168 * TCD_STOCK_PAGES pagesful are consumed by trace records all
169 * emitted in non-blocking contexts. Which is quite unlikely.
171 struct list_head tcd_stock_pages;
172 /* number of pages on ->tcd_stock_pages */
173 unsigned long tcd_cur_stock_pages;
175 unsigned short tcd_shutting_down;
176 unsigned short tcd_cpu;
177 unsigned short tcd_type;
178 /* The factors to share debug memory. */
179 unsigned short tcd_pages_factor;
181 char __pad[L1_CACHE_ALIGN(sizeof(struct cfs_trace_cpu_data))];
184 #define TCD_MAX_TYPES 8
185 extern union cfs_trace_data_union (*cfs_trace_data[TCD_MAX_TYPES])[NR_CPUS];
187 #define cfs_tcd_for_each(tcd, i, j) \
188 for (i = 0; cfs_trace_data[i] != NULL; i++) \
189 for (j = 0, ((tcd) = &(*cfs_trace_data[i])[j].tcd); \
190 j < num_possible_cpus(); \
191 j++, (tcd) = &(*cfs_trace_data[i])[j].tcd)
193 #define cfs_tcd_for_each_type_lock(tcd, i, cpu) \
194 for (i = 0; cfs_trace_data[i] && \
195 (tcd = &(*cfs_trace_data[i])[cpu].tcd) && \
196 cfs_trace_lock_tcd(tcd, 1); cfs_trace_unlock_tcd(tcd, 1), i++)
198 /* XXX nikita: this declaration is internal to tracefile.c and should probably
200 struct page_collection {
201 struct list_head pc_pages;
203 * if this flag is set, collect_pages() will spill both
204 * ->tcd_daemon_pages and ->tcd_pages to the ->pc_pages. Otherwise,
205 * only ->tcd_pages are spilled.
207 int pc_want_daemon_pages;
210 /* XXX nikita: this declaration is internal to tracefile.c and should probably
212 struct tracefiled_ctl {
213 struct completion tctl_start;
214 struct completion tctl_stop;
215 wait_queue_head_t tctl_waitq;
217 atomic_t tctl_shutdown;
221 * small data-structure for each page owned by tracefiled.
223 /* XXX nikita: this declaration is internal to tracefile.c and should probably
225 struct cfs_trace_page {
231 * linkage into one of the lists in trace_data_union or
234 struct list_head linkage;
236 * number of bytes used within this page
240 * cpu that owns this page
244 * type(context) of this page
249 void cfs_set_ptldebug_header(struct ptldebug_header *header,
250 struct libcfs_debug_msg_data *m,
251 unsigned long stack);
252 void cfs_print_to_console(struct ptldebug_header *hdr, int mask,
253 const char *buf, int len, const char *file,
256 int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking);
257 void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking);
259 extern char *cfs_trace_console_buffers[NR_CPUS][CFS_TCD_TYPE_MAX];
260 cfs_trace_buf_type_t cfs_trace_buf_idx_get(void);
263 cfs_trace_get_console_buffer(void)
265 unsigned int i = get_cpu();
266 unsigned int j = cfs_trace_buf_idx_get();
268 return cfs_trace_console_buffers[i][j];
271 static inline struct cfs_trace_cpu_data *
272 cfs_trace_get_tcd(void)
274 struct cfs_trace_cpu_data *tcd =
275 &(*cfs_trace_data[cfs_trace_buf_idx_get()])[get_cpu()].tcd;
277 cfs_trace_lock_tcd(tcd, 0);
283 cfs_trace_put_tcd (struct cfs_trace_cpu_data *tcd)
285 cfs_trace_unlock_tcd(tcd, 0);
290 int cfs_trace_refill_stock(struct cfs_trace_cpu_data *tcd, gfp_t gfp,
291 struct list_head *stock);
293 int cfs_tcd_owns_tage(struct cfs_trace_cpu_data *tcd,
294 struct cfs_trace_page *tage);
296 void cfs_trace_assertion_failed(const char *str,
297 struct libcfs_debug_msg_data *m);
299 /* ASSERTION that is safe to use within the debug system */
300 #define __LASSERT(cond) \
302 if (unlikely(!(cond))) { \
303 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_EMERG, NULL); \
304 cfs_trace_assertion_failed("ASSERTION("#cond") failed", \
309 #define __LASSERT_TAGE_INVARIANT(tage) \
311 __LASSERT(tage != NULL); \
312 __LASSERT(tage->page != NULL); \
313 __LASSERT(tage->used <= PAGE_CACHE_SIZE); \
314 __LASSERT(page_count(tage->page) > 0); \
317 #endif /* LUSTRE_TRACEFILE_PRIVATE */
319 #endif /* __LIBCFS_TRACEFILE_H__ */