-#ifndef __PORTALS_TRACEFILE_H
-#define __PORTALS_TRACEFILE_H
+#ifndef __LIBCFS_TRACEFILE_H__
+#define __LIBCFS_TRACEFILE_H__
+
+#include <libcfs/libcfs.h>
+
+/* trace file lock routines */
+
+int tracefile_init_arch(void);
+void tracefile_fini_arch(void);
+
+void tracefile_read_lock(void);
+void tracefile_read_unlock(void);
+void tracefile_write_lock(void);
+void tracefile_write_unlock(void);
int tracefile_dump_all_pages(char *filename);
void trace_debug_print(void);
int trace_dk(struct file *file, const char *buffer, unsigned long count,
void *data);
-#endif /* __PORTALS_TRACEFILE_H */
+extern void libcfs_debug_dumplog_internal(void *arg);
+extern void libcfs_register_panic_notifier(void);
+extern void libcfs_unregister_panic_notifier(void);
+extern int libcfs_panic_in_progress;
+
+#ifdef LUSTRE_TRACEFILE_PRIVATE
+/*
+ * Private declare for tracefile
+ */
+#define TCD_MAX_PAGES (5 << (20 - CFS_PAGE_SHIFT))
+#define TCD_STOCK_PAGES (TCD_MAX_PAGES)
+
+#define TRACEFILE_SIZE (500 << 20)
+
+/* Size of a buffer for sprinting console messages to in IRQ context (no
+ * logging in IRQ context) */
+#define TRACE_CONSOLE_BUFFER_SIZE 1024
+
+union trace_data_union {
+ struct trace_cpu_data {
+ /*
+ * pages with trace records not yet processed by tracefiled.
+ */
+ struct list_head tcd_pages;
+ /* number of pages on ->tcd_pages */
+ unsigned long tcd_cur_pages;
+
+ /*
+ * pages with trace records already processed by
+ * tracefiled. These pages are kept in memory, so that some
+ * portion of log can be written in the event of LBUG. This
+ * list is maintained in LRU order.
+ *
+ * Pages are moved to ->tcd_daemon_pages by tracefiled()
+ * (put_pages_on_daemon_list()). LRU pages from this list are
+ * discarded when list grows too large.
+ */
+ struct list_head tcd_daemon_pages;
+ /* number of pages on ->tcd_daemon_pages */
+ unsigned long tcd_cur_daemon_pages;
+
+ /*
+ * Maximal number of pages allowed on ->tcd_pages and
+ * ->tcd_daemon_pages each. Always TCD_MAX_PAGES in current
+ * implementation.
+ */
+ unsigned long tcd_max_pages;
+
+ /*
+ * preallocated pages to write trace records into. Pages from
+ * ->tcd_stock_pages are moved to ->tcd_pages by
+ * portals_debug_msg().
+ *
+ * This list is necessary, because on some platforms it's
+ * impossible to perform efficient atomic page allocation in a
+ * non-blockable context.
+ *
+ * Such platforms fill ->tcd_stock_pages "on occasion", when
+ * tracing code is entered in blockable context.
+ *
+ * trace_get_tage_try() tries to get a page from
+ * ->tcd_stock_pages first and resorts to atomic page
+ * allocation only if this queue is empty. ->tcd_stock_pages
+ * is replenished when tracing code is entered in blocking
+ * context (darwin-tracefile.c:trace_get_tcd()). We try to
+ * maintain TCD_STOCK_PAGES (40 by default) pages in this
+ * queue. Atomic allocation is only required if more than
+ * TCD_STOCK_PAGES pagesful are consumed by trace records all
+ * emitted in non-blocking contexts. Which is quite unlikely.
+ */
+ struct list_head tcd_stock_pages;
+ /* number of pages on ->tcd_stock_pages */
+ unsigned long tcd_cur_stock_pages;
+
+ int tcd_shutting_down;
+ int tcd_cpu;
+ } tcd;
+ char __pad[SMP_CACHE_BYTES];
+};
+
+/* XXX nikita: this declaration is internal to tracefile.c and should probably
+ * be moved there */
+struct page_collection {
+ struct list_head pc_pages;
+ /*
+ * spin-lock protecting ->pc_pages. It is taken by smp_call_function()
+ * call-back functions. XXX nikita: Which is horrible: all processors
+ * receive NMI at the same time only to be serialized by this
+ * lock. Probably ->pc_pages should be replaced with an array of
+ * NR_CPUS elements accessed locklessly.
+ */
+ spinlock_t pc_lock;
+ /*
+ * if this flag is set, collect_pages() will spill both
+ * ->tcd_daemon_pages and ->tcd_pages to the ->pc_pages. Otherwise,
+ * only ->tcd_pages are spilled.
+ */
+ int pc_want_daemon_pages;
+};
+
+/* XXX nikita: this declaration is internal to tracefile.c and should probably
+ * be moved there */
+struct tracefiled_ctl {
+ struct completion tctl_start;
+ struct completion tctl_stop;
+ cfs_waitq_t tctl_waitq;
+ pid_t tctl_pid;
+ atomic_t tctl_shutdown;
+};
+
+/*
+ * small data-structure for each page owned by tracefiled.
+ */
+/* XXX nikita: this declaration is internal to tracefile.c and should probably
+ * be moved there */
+struct trace_page {
+ /*
+ * page itself
+ */
+ cfs_page_t *page;
+ /*
+ * linkage into one of the lists in trace_data_union or
+ * page_collection
+ */
+ struct list_head linkage;
+ /*
+ * number of bytes used within this page
+ */
+ unsigned int used;
+ /*
+ * cpu that owns this page
+ */
+ int cpu;
+};
+
+extern void set_ptldebug_header(struct ptldebug_header *header,
+ int subsys, int mask, const int line,
+ unsigned long stack);
+extern void print_to_console(struct ptldebug_header *hdr, int mask, const char *buf,
+ int len, const char *file, const char *fn);
+
+extern struct trace_cpu_data *trace_get_tcd(void);
+extern void trace_put_tcd(struct trace_cpu_data *tcd);
+extern char *trace_get_console_buffer(void);
+extern void trace_put_console_buffer(char *buffer);
+
+extern void trace_call_on_all_cpus(void (*fn)(void *arg), void *arg);
+
+int trace_refill_stock(struct trace_cpu_data *tcd, int gfp,
+ struct list_head *stock);
+
+
+int tcd_owns_tage(struct trace_cpu_data *tcd, struct trace_page *tage);
+
+extern void trace_assertion_failed(const char *str, const char *fn,
+ const char *file, int line);
+
+/* ASSERTION that is safe to use within the debug system */
+#define __LASSERT(cond) \
+({ \
+ if (unlikely(!(cond))) { \
+ trace_assertion_failed("ASSERTION("#cond") failed", \
+ __FUNCTION__, __FILE__, __LINE__); \
+ } \
+})
+
+#define __LASSERT_TAGE_INVARIANT(tage) \
+({ \
+ __LASSERT(tage != NULL); \
+ __LASSERT(tage->page != NULL); \
+ __LASSERT(tage->used <= CFS_PAGE_SIZE); \
+ __LASSERT(cfs_page_count(tage->page) > 0); \
+})
+
+#endif /* LUSTRE_TRACEFILE_PRIVATE */
+
+#endif /* __LIBCFS_TRACEFILE_H__ */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff