/* * trace_output.c * * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> * */ #include <linux/module.h> #include <linux/mutex.h> #include <linux/ftrace.h> #include "trace_output.h" /* must be a power of 2 */ #define EVENT_HASHSIZE 128 DECLARE_RWSEM(trace_event_mutex); DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq); EXPORT_PER_CPU_SYMBOL(ftrace_event_seq); static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly; static int next_event_type = __TRACE_LAST_TYPE + 1; int trace_print_seq(struct seq_file *m, struct trace_seq *s) { int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; int ret; ret = seq_write(m, s->buffer, len); /* * Only reset this buffer if we successfully wrote to the * seq_file buffer. */ if (!ret) trace_seq_init(s); return ret; } enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter) { struct trace_seq *s = &iter->seq; struct trace_entry *entry = iter->ent; struct bprint_entry *field; int ret; trace_assign_type(field, entry); ret = trace_seq_bprintf(s, field->fmt, field->buf); if (!ret) return TRACE_TYPE_PARTIAL_LINE; return TRACE_TYPE_HANDLED; } enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter) { struct trace_seq *s = &iter->seq; struct trace_entry *entry = iter->ent; struct print_entry *field; int ret; trace_assign_type(field, entry); ret = trace_seq_printf(s, "%s", field->buf); if (!ret) return TRACE_TYPE_PARTIAL_LINE; return TRACE_TYPE_HANDLED; } /** * trace_seq_printf - sequence printing of trace information * @s: trace sequence descriptor * @fmt: printf format string * * It returns 0 if the trace oversizes the buffer's free * space, 1 otherwise. * * The tracer may use either sequence operations or its own * copy to user routines. To simplify formating of a trace * trace_seq_printf is used to store strings into a special * buffer (@s). Then the output may be either used by * the sequencer or pulled into another buffer. */ int trace_seq_printf(struct trace_seq *s, const char *fmt, ...) { int len = (PAGE_SIZE - 1) - s->len; va_list ap; int ret; if (s->full || !len) return 0; va_start(ap, fmt); ret = vsnprintf(s->buffer + s->len, len, fmt, ap); va_end(ap); /* If we can't write it all, don't bother writing anything */ if (ret >= len) { s->full = 1; return 0; } s->len += ret; return 1; } EXPORT_SYMBOL_GPL(trace_seq_printf); /** * trace_seq_vprintf - sequence printing of trace information * @s: trace sequence descriptor * @fmt: printf format string * * The tracer may use either sequence operations or its own * copy to user routines. To simplify formating of a trace * trace_seq_printf is used to store strings into a special * buffer (@s). Then the output may be either used by * the sequencer or pulled into another buffer. */ int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args) { int len = (PAGE_SIZE - 1) - s->len; int ret; if (s->full || !len) return 0; ret = vsnprintf(s->buffer + s->len, len, fmt, args); /* If we can't write it all, don't bother writing anything */ if (ret >= len) { s->full = 1; return 0; } s->len += ret; return len; } EXPORT_SYMBOL_GPL(trace_seq_vprintf); int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary) { int len = (PAGE_SIZE - 1) - s->len; int ret; if (s->full || !len) return 0; ret = bstr_printf(s->buffer + s->len, len, fmt, binary); /* If we can't write it all, don't bother writing anything */ if (ret >= len) { s->full = 1; return 0; } s->len += ret; return len; } /** * trace_seq_puts - trace sequence printing of simple string * @s: trace sequence descriptor * @str: simple string to record * * The tracer may use either the sequence operations or its own * copy to user routines. This function records a simple string * into a special buffer (@s) for later retrieval by a sequencer * or other mechanism. */ int trace_seq_puts(struct trace_seq *s, const char *str) { int len = strlen(str); if (s->full) return 0; if (len > ((PAGE_SIZE - 1) - s->len)) { s->full = 1; return 0; } memcpy(s->buffer + s->len, str, len); s->len += len; return len; } int trace_seq_putc(struct trace_seq *s, unsigned char c) { if (s->full) return 0; if (s->len >= (PAGE_SIZE - 1)) { s->full = 1; return 0; } s->buffer[s->len++] = c; return 1; } int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len) { if (s->full) return 0; if (len > ((PAGE_SIZE - 1) - s->len)) { s->full = 1; return 0; } memcpy(s->buffer + s->len, mem, len); s->len += len; return len; } int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len) { unsigned char hex[HEX_CHARS]; const unsigned char *data = mem; int i, j; if (s->full) return 0; #ifdef __BIG_ENDIAN for (i = 0, j = 0; i < len; i++) { #else for (i = len-1, j = 0; i >= 0; i--) { #endif hex[j++] = hex_asc_hi(data[i]); hex[j++] = hex_asc_lo(data[i]); } hex[j++] = ' '; return trace_seq_putmem(s, hex, j); } void *trace_seq_reserve(struct trace_seq *s, size_t len) { void *ret; if (s->full) return 0; if (len > ((PAGE_SIZE - 1) - s->len)) { s->full = 1; return NULL; } ret = s->buffer + s->len; s->len += len; return ret; } int trace_seq_path(struct trace_seq *s, struct path *path) { unsigned char *p; if (s->full) return 0; if (s->len >= (PAGE_SIZE - 1)) { s->full = 1; return 0; } p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len); if (!IS_ERR(p)) { p = mangle_path(s->buffer + s->len, p, "\n"); if (p) { s->len = p - s->buffer; return 1; } } else { s->buffer[s->len++] = '?'; return 1; } s->full = 1; return 0; } const char * ftrace_print_flags_seq(struct trace_seq *p, const char *delim, unsigned long flags, const struct trace_print_flags *flag_array) { unsigned long mask; const char *str; const char *ret = p->buffer + p->len; int i; for (i = 0; flag_array[i].name && flags; i++) { mask = flag_array[i].mask; if ((flags & mask) != mask) continue; str = flag_array[i].name; flags &= ~mask; if (p->len && delim) trace_seq_puts(p, delim); trace_seq_puts(p, str); } /* check for left over flags */ if (flags) { if (p->len && delim) trace_seq_puts(p, delim); trace_seq_printf(p, "0x%lx", flags); } trace_seq_putc(p, 0); return ret; } EXPORT_SYMBOL(ftrace_print_flags_seq); const char * ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val, const struct trace_print_flags *symbol_array) { int i; const char *ret = p->buffer + p->len; for (i = 0; symbol_array[i].name; i++) { if (val != symbol_array[i].mask) continue; trace_seq_puts(p, symbol_array[i].name); break; } if (!p->len) trace_seq_printf(p, "0x%lx", val); trace_seq_putc(p, 0); return ret; } EXPORT_SYMBOL(ftrace_print_symbols_seq); #ifdef CONFIG_KRETPROBES static inline const char *kretprobed(const char *name) { static const char tramp_name[] = "kretprobe_trampoline"; int size = sizeof(tramp_name); if (strncmp(tramp_name, name, size) == 0) return "[unknown/kretprobe'd]"; return name; } #else static inline const char *kretprobed(const char *name) { return name; } #endif /* CONFIG_KRETPROBES */ static int seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) { #ifdef CONFIG_KALLSYMS char str[KSYM_SYMBOL_LEN]; const char *name; kallsyms_lookup(address, NULL, NULL, NULL, str); name = kretprobed(str); return trace_seq_printf(s, fmt, name); #endif return 1; } static int seq_print_sym_offset(struct trace_seq *s, const char *fmt, unsigned long address) { #ifdef CONFIG_KALLSYMS char str[KSYM_SYMBOL_LEN]; const char *name; sprint_symbol(str, address); name = kretprobed(str); return trace_seq_printf(s, fmt, name); #endif return 1; } #ifndef CONFIG_64BIT # define IP_FMT "%08lx" #else # define IP_FMT "%016lx" #endif int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, unsigned long ip, unsigned long sym_flags) { struct file *file = NULL; unsigned long vmstart = 0; int ret = 1; if (s->full) return 0; if (mm) { const struct vm_area_struct *vma; down_read(&mm->mmap_sem); vma = find_vma(mm, ip); if (vma) { file = vma->vm_file; vmstart = vma->vm_start; } if (file) { ret = trace_seq_path(s, &file->f_path); if (ret) ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart); } up_read(&mm->mmap_sem); } if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) ret = trace_seq_printf(s, " <" IP_FMT ">", ip); return ret; } int seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s, unsigned long sym_flags) { struct mm_struct *mm = NULL; int ret = 1; unsigned int i; if (trace_flags & TRACE_ITER_SYM_USEROBJ) { struct task_struct *task; /* * we do the lookup on the thread group leader, * since individual threads might have already quit! */ rcu_read_lock(); task = find_task_by_vpid(entry->tgid); if (task) mm = get_task_mm(task); rcu_read_unlock(); } for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { unsigned long ip = entry->caller[i]; if (ip == ULONG_MAX || !ret) break; if (ret) ret = trace_seq_puts(s, " => "); if (!ip) { if (ret) ret = trace_seq_puts(s, "??"); if (ret) ret = trace_seq_puts(s, "\n"); continue; } if (!ret) break; if (ret) ret = seq_print_user_ip(s, mm, ip, sym_flags); ret = trace_seq_puts(s, "\n"); } if (mm) mmput(mm); return ret; } int seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) { int ret; if (!ip) return trace_seq_printf(s, "0"); if (sym_flags & TRACE_ITER_SYM_OFFSET) ret = seq_print_sym_offset(s, "%s", ip); else ret = seq_print_sym_short(s, "%s", ip); if (!ret) return 0; if (sym_flags & TRACE_ITER_SYM_ADDR) ret = trace_seq_printf(s, " <" IP_FMT ">", ip); return ret; } /** * trace_print_lat_fmt - print the irq, preempt and lockdep fields * @s: trace seq struct to write to * @entry: The trace entry field from the ring buffer * * Prints the generic fields of irqs off, in hard or softirq, preempt * count and lock depth. */ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) { int hardirq, softirq; int ret; hardirq = entry->flags & TRACE_FLAG_HARDIRQ; softirq = entry->flags & TRACE_FLAG_SOFTIRQ; if (!trace_seq_printf(s, "%c%c%c", (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.', (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.', (hardirq && softirq) ? 'H' : hardirq ? 'h' : softirq ? 's' : '.')) return 0; if (entry->preempt_count) ret = trace_seq_printf(s, "%x", entry->preempt_count); else ret = trace_seq_putc(s, '.'); if (!ret) return 0; if (entry->lock_depth < 0) return trace_seq_putc(s, '.'); return trace_seq_printf(s, "%d", entry->lock_depth); } static int lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) { char comm[TASK_COMM_LEN]; trace_find_cmdline(entry->pid, comm); if (!trace_seq_printf(s, "%8.8s-%-5d %3d", comm, entry->pid, cpu)) return 0; return trace_print_lat_fmt(s, entry); } static unsigned long preempt_mark_thresh = 100; static int lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, unsigned long rel_usecs) { return trace_seq_printf(s, " %4lldus%c: ", abs_usecs, rel_usecs > preempt_mark_thresh ? '!' : rel_usecs > 1 ? '+' : ' '); } int trace_print_context(struct trace_iterator *iter) { struct trace_seq *s = &iter->seq; struct trace_entry *entry = iter->ent; unsigned long long t = ns2usecs(iter->ts); unsigned long usec_rem = do_div(t, USEC_PER_SEC); unsigned long secs = (unsigned long)t; char comm[TASK_COMM_LEN]; trace_find_cmdline(entry->pid, comm); return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ", comm, entry->pid, iter->cpu, secs, usec_rem); } int trace_print_lat_context(struct trace_iterator *iter) { u64 next_ts; int ret; struct trace_seq *s = &iter->seq; struct trace_entry *entry = iter->ent, *next_entry = trace_find_next_entry(iter, NULL, &next_ts); unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); unsigned long rel_usecs; if (!next_entry) next_ts = iter->ts; rel_usecs = ns2usecs(next_ts - iter->ts); if (verbose) { char comm[TASK_COMM_LEN]; trace_find_cmdline(entry->pid, comm); ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]" " %ld.%03ldms (+%ld.%03ldms): ", comm, entry->pid, iter->cpu, entry->flags, entry->preempt_count, iter->idx, ns2usecs(iter->ts), abs_usecs / USEC_PER_MSEC, abs_usecs % USEC_PER_MSEC, rel_usecs / USEC_PER_MSEC, rel_usecs % USEC_PER_MSEC); } else { ret = lat_print_generic(s, entry, iter->cpu); if (ret) ret = lat_print_timestamp(s, abs_usecs, rel_usecs); } return ret; } static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; static int task_state_char(unsigned long state) { int bit = state ? __ffs(state) + 1 : 0; return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?'; } /** * ftrace_find_event - find a registered event * @type: the type of event to look for * * Returns an event of type @type otherwise NULL * Called with trace_event_read_lock() held. */ struct trace_event *ftrace_find_event(int type) { struct trace_event *event; struct hlist_node *n; unsigned key; key = type & (EVENT_HASHSIZE - 1); hlist_for_each_entry(event, n, &event_hash[key], node) { if (event->type == type) return event; } return NULL; } static LIST_HEAD(ftrace_event_list); static int trace_search_list(struct list_head **list) { struct trace_event *e; int last = __TRACE_LAST_TYPE; if (list_empty(&ftrace_event_list)) { *list = &ftrace_event_list; return last + 1; } /* * We used up all possible max events, * lets see if somebody freed one. */ list_for_each_entry(e, &ftrace_event_list, list) { if (e->type != last + 1) break; last++; } /* Did we used up all 65 thousand events??? */ if ((last + 1) > FTRACE_MAX_EVENT) return 0; *list = &e->list; return last + 1; } void trace_event_read_lock(void) { down_read(&trace_event_mutex); } void trace_event_read_unlock(void) { up_read(&trace_event_mutex); } /** * register_ftrace_event - register output for an event type * @event: the event type to register * * Event types are stored in a hash and this hash is used to * find a way to print an event. If the @event->type is set * then it will use that type, otherwise it will assign a * type to use. * * If you assign your own type, please make sure it is added * to the trace_type enum in trace.h, to avoid collisions * with the dynamic types. * * Returns the event type number or zero on error. */ int register_ftrace_event(struct trace_event *event) { unsigned key; int ret = 0; down_write(&trace_event_mutex); if (WARN_ON(!event)) goto out; INIT_LIST_HEAD(&event->list); if (!event->type) { struct list_head *list = NULL; if (next_event_type > FTRACE_MAX_EVENT) { event->type = trace_search_list(&list); if (!event->type) goto out; } else { event->type = next_event_type++; list = &ftrace_event_list; } if (WARN_ON(ftrace_find_event(event->type))) goto out; list_add_tail(&event->list, list); } else if (event->type > __TRACE_LAST_TYPE) { printk(KERN_WARNING "Need to add type to trace.h\n"); WARN_ON(1); goto out; } else { /* Is this event already used */ if (ftrace_find_event(event->type)) goto out; } if (event->trace == NULL) event->trace = trace_nop_print; if (event->raw == NULL) event->raw = trace_nop_print; if (event->hex == NULL) event->hex = trace_nop_print; if (event->binary == NULL) event->binary = trace_nop_print; key = event->type & (EVENT_HASHSIZE - 1); hlist_add_head(&event->node, &event_hash[key]); ret = event->type; out: up_write(&trace_event_mutex); return ret; } EXPORT_SYMBOL_GPL(register_ftrace_event); /* * Used by module code with the trace_event_mutex held for write. */ int __unregister_ftrace_event(struct trace_event *event) { hlist_del(&event->node); list_del(&event->list); return 0; } /** * unregister_ftrace_event - remove a no longer used event * @event: the event to remove */ int unregister_ftrace_event(struct trace_event *event) { down_write(&trace_event_mutex); __unregister_ftrace_event(event); up_write(&trace_event_mutex); return 0; } EXPORT_SYMBOL_GPL(unregister_ftrace_event); /* * Standard events */ enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags) { return TRACE_TYPE_HANDLED; } /* TRACE_FN */ static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags) { struct ftrace_entry *field; struct trace_seq *s = &iter->seq; trace_assign_type(field, iter->ent); if (!seq_print_ip_sym(s, field->ip, flags)) goto partial; if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) { if (!trace_seq_printf(s, " <-")) goto partial; if (!seq_print_ip_sym(s, field->parent_ip, flags)) goto partial; } if (!trace_seq_printf(s, "\n")) goto partial; return TRACE_TYPE_HANDLED; partial: return TRACE_TYPE_PARTIAL_LINE; } static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags) { struct ftrace_entry *field; trace_assign_type(field, iter->ent); if (!trace_seq_printf(&iter->seq, "%lx %lx\n", field->ip, field->parent_ip)) return TRACE_TYPE_PARTIAL_LINE; return TRACE_TYPE_HANDLED; } static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags) { struct ftrace_entry *field; struct trace_seq *s = &iter->seq; trace_assign_type(field, iter->ent); SEQ_PUT_HEX_FIELD_RET(s, field->ip); SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); return TRACE_TYPE_HANDLED; } static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags) { struct ftrace_entry *field; struct trace_seq *s = &iter->seq; trace_assign_type(field, iter->ent); SEQ_PUT_FIELD_RET(s, field->ip); SEQ_PUT_FIELD_RET(s, field->parent_ip); return TRACE_TYPE_HANDLED; } static struct trace_event trace_fn_event = { .type = TRACE_FN, .trace = trace_fn_trace, .raw = trace_fn_raw, .hex = trace_fn_hex, .binary = trace_fn_bin, }; /* TRACE_CTX an TRACE_WAKE */ static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, char *delim) { struct ctx_switch_entry *field; char comm[TASK_COMM_LEN]; int S, T; trace_assign_type(field, iter->ent); T = task_state_char(field->next_state); S = task_state_char(field->prev_state); trace_find_cmdline(field->next_pid, comm); if (!trace_seq_printf(&iter->seq, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", field->prev_pid, field->prev_prio, S, delim, field->next_cpu, field->next_pid, field->next_prio, T, comm)) return TRACE_TYPE_PARTIAL_LINE; return TRACE_TYPE_HANDLED; } static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags) { return trace_ctxwake_print(iter, "==>"); } static enum print_line_t trace_wake_print(struct trace_iterator *iter, int flags) { return trace_ctxwake_print(iter, " +"); } static int trace_ctxwake_raw(struct trace_iterator *iter, char S) { struct ctx_switch_entry *field; int T; trace_assign_type(field, iter->ent); if (!S) S = task_state_char(field->prev_state); T = task_state_char(field->next_state); if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", field->prev_pid, field->prev_prio, S, field->next_cpu, field->next_pid, field->next_prio, T)) return TRACE_TYPE_PARTIAL_LINE; return TRACE_TYPE_HANDLED; } static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags) { return trace_ctxwake_raw(iter, 0); } static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags) { return trace_ctxwake_raw(iter, '+'); } static int trace_ctxwake_hex(struct trace_iterator *iter, char S) { struct ctx_switch_entry *field; struct trace_seq *s = &iter->seq; int T; trace_assign_type(field, iter->ent); if (!S) S = task_state_char(field->prev_state); T = task_state_char(field->next_state); SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); SEQ_PUT_HEX_FIELD_RET(s, S); SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); SEQ_PUT_HEX_FIELD_RET(s, T); return TRACE_TYPE_HANDLED; } static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags) { return trace_ctxwake_hex(iter, 0); } static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags) { return trace_ctxwake_hex(iter, '+'); } static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, int flags) { struct ctx_switch_entry *field; struct trace_seq *s = &iter->seq; trace_assign_type(field, iter->ent); SEQ_PUT_FIELD_RET(s, field->prev_pid); SEQ_PUT_FIELD_RET(s, field->prev_prio); SEQ_PUT_FIELD_RET(s, field->prev_state); SEQ_PUT_FIELD_RET(s, field->next_pid); SEQ_PUT_FIELD_RET(s, field->next_prio); SEQ_PUT_FIELD_RET(s, field->next_state); return TRACE_TYPE_HANDLED; } static struct trace_event trace_ctx_event = { .type = TRACE_CTX, .trace = trace_ctx_print, .raw = trace_ctx_raw, .hex = trace_ctx_hex, .binary = trace_ctxwake_bin, }; static struct trace_event trace_wake_event = { .type = TRACE_WAKE, .trace = trace_wake_print, .raw = trace_wake_raw, .hex = trace_wake_hex, .binary = trace_ctxwake_bin, }; /* TRACE_SPECIAL */ static enum print_line_t trace_special_print(struct trace_iterator *iter, int flags) { struct special_entry *field; trace_assign_type(field, iter->ent); if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n", field->arg1, field->arg2, field->arg3)) return TRACE_TYPE_PARTIAL_LINE; return TRACE_TYPE_HANDLED; } static enum print_line_t trace_special_hex(struct trace_iterator *iter, int flags) { struct special_entry *field; struct trace_seq *s = &iter->seq; trace_assign_type(field, iter->ent); SEQ_PUT_HEX_FIELD_RET(s, field->arg1); SEQ_PUT_HEX_FIELD_RET(s, field->arg2); SEQ_PUT_HEX_FIELD_RET(s, field->arg3); return TRACE_TYPE_HANDLED; } static enum print_line_t trace_special_bin(struct trace_iterator *iter, int flags) { struct special_entry *field; struct trace_seq *s = &iter->seq; trace_assign_type(field, iter->ent); SEQ_PUT_FIELD_RET(s, field->arg1); SEQ_PUT_FIELD_RET(s, field->arg2); SEQ_PUT_FIELD_RET(s, field->arg3); return TRACE_TYPE_HANDLED; } static struct trace_event trace_special_event = { .type = TRACE_SPECIAL, .trace = trace_special_print, .raw = trace_special_print, .hex = trace_special_hex, .binary = trace_special_bin, }; /* TRACE_STACK */ static enum print_line_t trace_stack_print(struct trace_iterator *iter, int flags) { struct stack_entry *field; struct trace_seq *s = &iter->seq; int i; trace_assign_type(field, iter->ent); if (!trace_seq_puts(s, "<stack trace>\n")) goto partial; for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { if (!field->caller[i] || (field->caller[i] == ULONG_MAX)) break; if (!trace_seq_puts(s, " => ")) goto partial; if (!seq_print_ip_sym(s, field->caller[i], flags)) goto partial; if (!trace_seq_puts(s, "\n")) goto partial; } return TRACE_TYPE_HANDLED; partial: return TRACE_TYPE_PARTIAL_LINE; } static struct trace_event trace_stack_event = { .type = TRACE_STACK, .trace = trace_stack_print, .raw = trace_special_print, .hex = trace_special_hex, .binary = trace_special_bin, }; /* TRACE_USER_STACK */ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, int flags) { struct userstack_entry *field; struct trace_seq *s = &iter->seq; trace_assign_type(field, iter->ent); if (!trace_seq_puts(s, "<user stack trace>\n")) goto partial; if (!seq_print_userip_objs(field, s, flags)) goto partial; return TRACE_TYPE_HANDLED; partial: return TRACE_TYPE_PARTIAL_LINE; } static struct trace_event trace_user_stack_event = { .type = TRACE_USER_STACK, .trace = trace_user_stack_print, .raw = trace_special_print, .hex = trace_special_hex, .binary = trace_special_bin, }; /* TRACE_BPRINT */ static enum print_line_t trace_bprint_print(struct trace_iterator *iter, int flags) { struct trace_entry *entry = iter->ent; struct trace_seq *s = &iter->seq; struct bprint_entry *field; trace_assign_type(field, entry); if (!seq_print_ip_sym(s, field->ip, flags)) goto partial; if (!trace_seq_puts(s, ": ")) goto partial; if (!trace_seq_bprintf(s, field->fmt, field->buf)) goto partial; return TRACE_TYPE_HANDLED; partial: return TRACE_TYPE_PARTIAL_LINE; } static enum print_line_t trace_bprint_raw(struct trace_iterator *iter, int flags) { struct bprint_entry *field; struct trace_seq *s = &iter->seq; trace_assign_type(field, iter->ent); if (!trace_seq_printf(s, ": %lx : ", field->ip)) goto partial; if (!trace_seq_bprintf(s, field->fmt, field->buf)) goto partial; return TRACE_TYPE_HANDLED; partial: return TRACE_TYPE_PARTIAL_LINE; } static struct trace_event trace_bprint_event = { .type = TRACE_BPRINT, .trace = trace_bprint_print, .raw = trace_bprint_raw, }; /* TRACE_PRINT */ static enum print_line_t trace_print_print(struct trace_iterator *iter, int flags) { struct print_entry *field; struct trace_seq *s = &iter->seq; trace_assign_type(field, iter->ent); if (!seq_print_ip_sym(s, field->ip, flags)) goto partial; if (!trace_seq_printf(s, ": %s", field->buf)) goto partial; return TRACE_TYPE_HANDLED; partial: return TRACE_TYPE_PARTIAL_LINE; } static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags) { struct print_entry *field; trace_assign_type(field, iter->ent); if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf)) goto partial; return TRACE_TYPE_HANDLED; partial: return TRACE_TYPE_PARTIAL_LINE; } static struct trace_event trace_print_event = { .type = TRACE_PRINT, .trace = trace_print_print, .raw = trace_print_raw, }; static struct trace_event *events[] __initdata = { &trace_fn_event, &trace_ctx_event, &trace_wake_event, &trace_special_event, &trace_stack_event, &trace_user_stack_event, &trace_bprint_event, &trace_print_event, NULL }; __init static int init_events(void) { struct trace_event *event; int i, ret; for (i = 0; events[i]; i++) { event = events[i]; ret = register_ftrace_event(event); if (!ret) { printk(KERN_WARNING "event %d failed to register\n", event->type); WARN_ON_ONCE(1); } } return 0; } device_initcall(init_events);