/* * 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_sem); 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_bputs_msg_only(struct trace_iterator *iter){ struct trace_seq *s = &iter->seq; struct trace_entry *entry = iter->ent; struct bputs_entry *field; int ret; trace_assign_type(field, entry); ret = trace_seq_puts(s, field->str); if (!ret) return TRACE_TYPE_PARTIAL_LINE; return TRACE_TYPE_HANDLED;} 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_puts(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. */inttrace_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. */inttrace_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;}EXPORT_SYMBOL(trace_seq_putc); 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 NULL; 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, const 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, first = 1; 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 (!first && delim) trace_seq_puts(p, delim); else first = 0; trace_seq_puts(p, str); } /* check for left over flags */ if (flags) { if (!first && 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 (ret == (const char *)(p->buffer + p->len)) trace_seq_printf(p, "0x%lx", val); trace_seq_putc(p, 0); return ret;}EXPORT_SYMBOL(ftrace_print_symbols_seq); #if BITS_PER_LONG == 32const char *ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val, const struct trace_print_flags_u64 *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 (ret == (const char *)(p->buffer + p->len)) trace_seq_printf(p, "0x%llx", val); trace_seq_putc(p, 0); return ret;}EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);#endif const char *ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len){ int i; const char *ret = p->buffer + p->len; for (i = 0; i < buf_len; i++) trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]); trace_seq_putc(p, 0); return ret;}EXPORT_SYMBOL(ftrace_print_hex_seq); int ftrace_raw_output_prep(struct trace_iterator *iter, struct trace_event *trace_event){ struct ftrace_event_call *event; struct trace_seq *s = &iter->seq; struct trace_seq *p = &iter->tmp_seq; struct trace_entry *entry; int ret; event = container_of(trace_event, struct ftrace_event_call, event); entry = iter->ent; if (entry->type != event->event.type) { WARN_ON_ONCE(1); return TRACE_TYPE_UNHANDLED; } trace_seq_init(p); ret = trace_seq_printf(s, "%s: ", ftrace_event_name(event)); if (!ret) return TRACE_TYPE_PARTIAL_LINE; return 0;}EXPORT_SYMBOL(ftrace_raw_output_prep); static int ftrace_output_raw(struct trace_iterator *iter, char *name, char *fmt, va_list ap){ struct trace_seq *s = &iter->seq; int ret; ret = trace_seq_printf(s, "%s: ", name); if (!ret) return TRACE_TYPE_PARTIAL_LINE; ret = trace_seq_vprintf(s, fmt, ap); if (!ret) return TRACE_TYPE_PARTIAL_LINE; return TRACE_TYPE_HANDLED;} int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...){ va_list ap; int ret; va_start(ap, fmt); ret = ftrace_output_raw(iter, name, fmt, ap); va_end(ap); return ret;}EXPORT_SYMBOL_GPL(ftrace_output_call); #ifdef CONFIG_KRETPROBESstatic 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;}#elsestatic inline const char *kretprobed(const char *name){ return name;}#endif /* CONFIG_KRETPROBES */ static intseq_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); Lines 1–500 of 1502. 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/* * 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_sem); 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_bputs_msg_only(struct trace_iterator *iter) { struct trace_seq *s = &iter->seq; struct trace_entry *entry = iter->ent; struct bputs_entry *field; int ret; trace_assign_type(field, entry); ret = trace_seq_puts(s, field->str); if (!ret) return TRACE_TYPE_PARTIAL_LINE; return TRACE_TYPE_HANDLED; } 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_puts(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; } EXPORT_SYMBOL(trace_seq_putc); 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 NULL; 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, const 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, first = 1; 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 (!first && delim) trace_seq_puts(p, delim); else first = 0; trace_seq_puts(p, str); } /* check for left over flags */ if (flags) { if (!first && 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 (ret == (const char *)(p->buffer + p->len)) trace_seq_printf(p, "0x%lx", val); trace_seq_putc(p, 0); return ret; } EXPORT_SYMBOL(ftrace_print_symbols_seq); #if BITS_PER_LONG == 32 const char * ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val, const struct trace_print_flags_u64 *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 (ret == (const char *)(p->buffer + p->len)) trace_seq_printf(p, "0x%llx", val); trace_seq_putc(p, 0); return ret; } EXPORT_SYMBOL(ftrace_print_symbols_seq_u64); #endif const char * ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len) { int i; const char *ret = p->buffer + p->len; for (i = 0; i < buf_len; i++) trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]); trace_seq_putc(p, 0); return ret; } EXPORT_SYMBOL(ftrace_print_hex_seq); int ftrace_raw_output_prep(struct trace_iterator *iter, struct trace_event *trace_event) { struct ftrace_event_call *event; struct trace_seq *s = &iter->seq; struct trace_seq *p = &iter->tmp_seq; struct trace_entry *entry; int ret; event = container_of(trace_event, struct ftrace_event_call, event); entry = iter->ent; if (entry->type != event->event.type) { WARN_ON_ONCE(1); return TRACE_TYPE_UNHANDLED; } trace_seq_init(p); ret = trace_seq_printf(s, "%s: ", ftrace_event_name(event)); if (!ret) return TRACE_TYPE_PARTIAL_LINE; return 0; } EXPORT_SYMBOL(ftrace_raw_output_prep); static int ftrace_output_raw(struct trace_iterator *iter, char *name, char *fmt, va_list ap) { struct trace_seq *s = &iter->seq; int ret; ret = trace_seq_printf(s, "%s: ", name); if (!ret) return TRACE_TYPE_PARTIAL_LINE; ret = trace_seq_vprintf(s, fmt, ap); if (!ret) return TRACE_TYPE_PARTIAL_LINE; return TRACE_TYPE_HANDLED; } int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...) { va_list ap; int ret; va_start(ap, fmt); ret = ftrace_output_raw(iter, name, fmt, ap); va_end(ap); return ret; } EXPORT_SYMBOL_GPL(ftrace_output_call); #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);