*/
bool __read_mostly tracing_selftest_disabled;
+/* Pipe tracepoints to printk */
+struct trace_iterator *tracepoint_print_iter;
+int tracepoint_printk;
+
/* For tracers that don't implement custom flags */
static struct tracer_opt dummy_tracer_opt[] = {
{ }
static int __init stop_trace_on_warning(char *str)
{
- __disable_trace_on_warning = 1;
+ if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0))
+ __disable_trace_on_warning = 1;
return 1;
}
-__setup("traceoff_on_warning=", stop_trace_on_warning);
+__setup("traceoff_on_warning", stop_trace_on_warning);
static int __init boot_alloc_snapshot(char *str)
{
}
__setup("trace_clock=", set_trace_boot_clock);
+static int __init set_tracepoint_printk(char *str)
+{
+ if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0))
+ tracepoint_printk = 1;
+ return 1;
+}
+__setup("tp_printk", set_tracepoint_printk);
unsigned long long ns2usecs(cycle_t nsec)
{
return ret;
}
+/* TODO add a seq_buf_to_buffer() */
static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt)
{
int len;
- if (s->len <= s->readpos)
+ if (trace_seq_used(s) <= s->seq.readpos)
return -EBUSY;
- len = s->len - s->readpos;
+ len = trace_seq_used(s) - s->seq.readpos;
if (cnt > len)
cnt = len;
- memcpy(buf, s->buffer + s->readpos, cnt);
+ memcpy(buf, s->buffer + s->seq.readpos, cnt);
- s->readpos += cnt;
+ s->seq.readpos += cnt;
return cnt;
}
pr_warning("** trace_printk() being used. Allocating extra memory. **\n");
pr_warning("** **\n");
pr_warning("** This means that this is a DEBUG kernel and it is **\n");
- pr_warning("** unsafe for produciton use. **\n");
+ pr_warning("** unsafe for production use. **\n");
pr_warning("** **\n");
pr_warning("** If you see this message and you are not debugging **\n");
pr_warning("** the kernel, report this immediately to your vendor! **\n");
goto out;
}
- len = vsnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args);
- if (len > TRACE_BUF_SIZE)
- goto out;
+ len = vscnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args);
local_save_flags(flags);
size = sizeof(*entry) + len + 1;
entry = ring_buffer_event_data(event);
entry->ip = ip;
- memcpy(&entry->buf, tbuffer, len);
- entry->buf[len] = '\0';
+ memcpy(&entry->buf, tbuffer, len + 1);
if (!call_filter_check_discard(call, entry, buffer, event)) {
__buffer_unlock_commit(buffer, event);
ftrace_trace_stack(buffer, flags, 6, pc);
static void print_lat_help_header(struct seq_file *m)
{
- seq_puts(m, "# _------=> CPU# \n");
- seq_puts(m, "# / _-----=> irqs-off \n");
- seq_puts(m, "# | / _----=> need-resched \n");
- seq_puts(m, "# || / _---=> hardirq/softirq \n");
- seq_puts(m, "# ||| / _--=> preempt-depth \n");
- seq_puts(m, "# |||| / delay \n");
- seq_puts(m, "# cmd pid ||||| time | caller \n");
- seq_puts(m, "# \\ / ||||| \\ | / \n");
+ seq_puts(m, "# _------=> CPU# \n"
+ "# / _-----=> irqs-off \n"
+ "# | / _----=> need-resched \n"
+ "# || / _---=> hardirq/softirq \n"
+ "# ||| / _--=> preempt-depth \n"
+ "# |||| / delay \n"
+ "# cmd pid ||||| time | caller \n"
+ "# \\ / ||||| \\ | / \n");
}
static void print_event_info(struct trace_buffer *buf, struct seq_file *m)
static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m)
{
print_event_info(buf, m);
- seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n");
- seq_puts(m, "# | | | | |\n");
+ seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"
+ "# | | | | |\n");
}
static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m)
{
print_event_info(buf, m);
- seq_puts(m, "# _-----=> irqs-off\n");
- seq_puts(m, "# / _----=> need-resched\n");
- seq_puts(m, "# | / _---=> hardirq/softirq\n");
- seq_puts(m, "# || / _--=> preempt-depth\n");
- seq_puts(m, "# ||| / delay\n");
- seq_puts(m, "# TASK-PID CPU# |||| TIMESTAMP FUNCTION\n");
- seq_puts(m, "# | | | |||| | |\n");
+ seq_puts(m, "# _-----=> irqs-off\n"
+ "# / _----=> need-resched\n"
+ "# | / _---=> hardirq/softirq\n"
+ "# || / _--=> preempt-depth\n"
+ "# ||| / delay\n"
+ "# TASK-PID CPU# |||| TIMESTAMP FUNCTION\n"
+ "# | | | |||| | |\n");
}
void
event = ftrace_find_event(entry->type);
if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
- if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
- if (!trace_print_lat_context(iter))
- goto partial;
- } else {
- if (!trace_print_context(iter))
- goto partial;
- }
+ if (iter->iter_flags & TRACE_FILE_LAT_FMT)
+ trace_print_lat_context(iter);
+ else
+ trace_print_context(iter);
}
+ if (trace_seq_has_overflowed(s))
+ return TRACE_TYPE_PARTIAL_LINE;
+
if (event)
return event->funcs->trace(iter, sym_flags, event);
- if (!trace_seq_printf(s, "Unknown type %d\n", entry->type))
- goto partial;
+ trace_seq_printf(s, "Unknown type %d\n", entry->type);
- return TRACE_TYPE_HANDLED;
-partial:
- return TRACE_TYPE_PARTIAL_LINE;
+ return trace_handle_return(s);
}
static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
entry = iter->ent;
- if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
- if (!trace_seq_printf(s, "%d %d %llu ",
- entry->pid, iter->cpu, iter->ts))
- goto partial;
- }
+ if (trace_flags & TRACE_ITER_CONTEXT_INFO)
+ trace_seq_printf(s, "%d %d %llu ",
+ entry->pid, iter->cpu, iter->ts);
+
+ if (trace_seq_has_overflowed(s))
+ return TRACE_TYPE_PARTIAL_LINE;
event = ftrace_find_event(entry->type);
if (event)
return event->funcs->raw(iter, 0, event);
- if (!trace_seq_printf(s, "%d ?\n", entry->type))
- goto partial;
+ trace_seq_printf(s, "%d ?\n", entry->type);
- return TRACE_TYPE_HANDLED;
-partial:
- return TRACE_TYPE_PARTIAL_LINE;
+ return trace_handle_return(s);
}
static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
entry = iter->ent;
if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
- SEQ_PUT_HEX_FIELD_RET(s, entry->pid);
- SEQ_PUT_HEX_FIELD_RET(s, iter->cpu);
- SEQ_PUT_HEX_FIELD_RET(s, iter->ts);
+ SEQ_PUT_HEX_FIELD(s, entry->pid);
+ SEQ_PUT_HEX_FIELD(s, iter->cpu);
+ SEQ_PUT_HEX_FIELD(s, iter->ts);
+ if (trace_seq_has_overflowed(s))
+ return TRACE_TYPE_PARTIAL_LINE;
}
event = ftrace_find_event(entry->type);
return ret;
}
- SEQ_PUT_FIELD_RET(s, newline);
+ SEQ_PUT_FIELD(s, newline);
- return TRACE_TYPE_HANDLED;
+ return trace_handle_return(s);
}
static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
entry = iter->ent;
if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
- SEQ_PUT_FIELD_RET(s, entry->pid);
- SEQ_PUT_FIELD_RET(s, iter->cpu);
- SEQ_PUT_FIELD_RET(s, iter->ts);
+ SEQ_PUT_FIELD(s, entry->pid);
+ SEQ_PUT_FIELD(s, iter->cpu);
+ SEQ_PUT_FIELD(s, iter->ts);
+ if (trace_seq_has_overflowed(s))
+ return TRACE_TYPE_PARTIAL_LINE;
}
event = ftrace_find_event(entry->type);
{
enum print_line_t ret;
- if (iter->lost_events &&
- !trace_seq_printf(&iter->seq, "CPU:%d [LOST %lu EVENTS]\n",
- iter->cpu, iter->lost_events))
- return TRACE_TYPE_PARTIAL_LINE;
+ if (iter->lost_events) {
+ trace_seq_printf(&iter->seq, "CPU:%d [LOST %lu EVENTS]\n",
+ iter->cpu, iter->lost_events);
+ if (trace_seq_has_overflowed(&iter->seq))
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
if (iter->trace && iter->trace->print_line) {
ret = iter->trace->print_line(iter);
{
if (!ftrace_is_dead())
return;
- seq_printf(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n");
- seq_printf(m, "# MAY BE MISSING FUNCTION EVENTS\n");
+ seq_puts(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n"
+ "# MAY BE MISSING FUNCTION EVENTS\n");
}
#ifdef CONFIG_TRACER_MAX_TRACE
static void show_snapshot_main_help(struct seq_file *m)
{
- seq_printf(m, "# echo 0 > snapshot : Clears and frees snapshot buffer\n");
- seq_printf(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n");
- seq_printf(m, "# Takes a snapshot of the main buffer.\n");
- seq_printf(m, "# echo 2 > snapshot : Clears snapshot buffer (but does not allocate or free)\n");
- seq_printf(m, "# (Doesn't have to be '2' works with any number that\n");
- seq_printf(m, "# is not a '0' or '1')\n");
+ seq_puts(m, "# echo 0 > snapshot : Clears and frees snapshot buffer\n"
+ "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n"
+ "# Takes a snapshot of the main buffer.\n"
+ "# echo 2 > snapshot : Clears snapshot buffer (but does not allocate or free)\n"
+ "# (Doesn't have to be '2' works with any number that\n"
+ "# is not a '0' or '1')\n");
}
static void show_snapshot_percpu_help(struct seq_file *m)
{
- seq_printf(m, "# echo 0 > snapshot : Invalid for per_cpu snapshot file.\n");
+ seq_puts(m, "# echo 0 > snapshot : Invalid for per_cpu snapshot file.\n");
#ifdef CONFIG_RING_BUFFER_ALLOW_SWAP
- seq_printf(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n");
- seq_printf(m, "# Takes a snapshot of the main buffer for this cpu.\n");
+ seq_puts(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n"
+ "# Takes a snapshot of the main buffer for this cpu.\n");
#else
- seq_printf(m, "# echo 1 > snapshot : Not supported with this kernel.\n");
- seq_printf(m, "# Must use main snapshot file to allocate.\n");
+ seq_puts(m, "# echo 1 > snapshot : Not supported with this kernel.\n"
+ "# Must use main snapshot file to allocate.\n");
#endif
- seq_printf(m, "# echo 2 > snapshot : Clears this cpu's snapshot buffer (but does not allocate)\n");
- seq_printf(m, "# (Doesn't have to be '2' works with any number that\n");
- seq_printf(m, "# is not a '0' or '1')\n");
+ seq_puts(m, "# echo 2 > snapshot : Clears this cpu's snapshot buffer (but does not allocate)\n"
+ "# (Doesn't have to be '2' works with any number that\n"
+ "# is not a '0' or '1')\n");
}
static void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter)
{
if (iter->tr->allocated_snapshot)
- seq_printf(m, "#\n# * Snapshot is allocated *\n#\n");
+ seq_puts(m, "#\n# * Snapshot is allocated *\n#\n");
else
- seq_printf(m, "#\n# * Snapshot is freed *\n#\n");
+ seq_puts(m, "#\n# * Snapshot is freed *\n#\n");
- seq_printf(m, "# Snapshot commands:\n");
+ seq_puts(m, "# Snapshot commands:\n");
if (iter->cpu_file == RING_BUFFER_ALL_CPUS)
show_snapshot_main_help(m);
else
if (!t)
return 0;
- seq_printf(m, "%s", t->name);
+ seq_puts(m, t->name);
if (t->next)
seq_putc(m, ' ');
else
goto out;
}
+ trace_seq_init(&iter->seq);
+
/*
* We make a copy of the current tracer to avoid concurrent
* changes on it while we are reading.
trace_access_lock(iter->cpu_file);
while (trace_find_next_entry_inc(iter) != NULL) {
enum print_line_t ret;
- int len = iter->seq.len;
+ int save_len = iter->seq.seq.len;
ret = print_trace_line(iter);
if (ret == TRACE_TYPE_PARTIAL_LINE) {
/* don't print partial lines */
- iter->seq.len = len;
+ iter->seq.seq.len = save_len;
break;
}
if (ret != TRACE_TYPE_NO_CONSUME)
trace_consume(iter);
- if (iter->seq.len >= cnt)
+ if (trace_seq_used(&iter->seq) >= cnt)
break;
/*
/* Now copy what we have to the user */
sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
- if (iter->seq.readpos >= iter->seq.len)
+ if (iter->seq.seq.readpos >= trace_seq_used(&iter->seq))
trace_seq_init(&iter->seq);
/*
tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter)
{
size_t count;
+ int save_len;
int ret;
/* Seq buffer is page-sized, exactly what we need. */
for (;;) {
- count = iter->seq.len;
+ save_len = iter->seq.seq.len;
ret = print_trace_line(iter);
- count = iter->seq.len - count;
- if (rem < count) {
- rem = 0;
- iter->seq.len -= count;
+
+ if (trace_seq_has_overflowed(&iter->seq)) {
+ iter->seq.seq.len = save_len;
break;
}
+
+ /*
+ * This should not be hit, because it should only
+ * be set if the iter->seq overflowed. But check it
+ * anyway to be safe.
+ */
if (ret == TRACE_TYPE_PARTIAL_LINE) {
- iter->seq.len -= count;
+ iter->seq.seq.len = save_len;
+ break;
+ }
+
+ count = trace_seq_used(&iter->seq) - save_len;
+ if (rem < count) {
+ rem = 0;
+ iter->seq.seq.len = save_len;
break;
}
/* Copy the data into the page, so we can start over. */
ret = trace_seq_to_buffer(&iter->seq,
page_address(spd.pages[i]),
- iter->seq.len);
+ trace_seq_used(&iter->seq));
if (ret < 0) {
__free_page(spd.pages[i]);
break;
}
spd.partial[i].offset = 0;
- spd.partial[i].len = iter->seq.len;
+ spd.partial[i].len = trace_seq_used(&iter->seq);
trace_seq_init(&iter->seq);
}
cnt = ring_buffer_read_events_cpu(trace_buf->buffer, cpu);
trace_seq_printf(s, "read events: %ld\n", cnt);
- count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);
+ count = simple_read_from_buffer(ubuf, count, ppos,
+ s->buffer, trace_seq_used(s));
kfree(s);
seq_printf(m, "%ps:", (void *)ip);
- seq_printf(m, "snapshot");
+ seq_puts(m, "snapshot");
if (count == -1)
- seq_printf(m, ":unlimited\n");
+ seq_puts(m, ":unlimited\n");
else
seq_printf(m, ":count=%ld\n", count);
int ret;
/* Paranoid: Make sure the parent is the "instances" directory */
- parent = hlist_entry(inode->i_dentry.first, struct dentry, d_alias);
+ parent = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
if (WARN_ON_ONCE(parent != trace_instance_dir))
return -ENOENT;
int ret;
/* Paranoid: Make sure the parent is the "instances" directory */
- parent = hlist_entry(inode->i_dentry.first, struct dentry, d_alias);
+ parent = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
if (WARN_ON_ONCE(parent != trace_instance_dir))
return -ENOENT;
trace_printk_seq(struct trace_seq *s)
{
/* Probably should print a warning here. */
- if (s->len >= TRACE_MAX_PRINT)
- s->len = TRACE_MAX_PRINT;
+ if (s->seq.len >= TRACE_MAX_PRINT)
+ s->seq.len = TRACE_MAX_PRINT;
+
+ /*
+ * More paranoid code. Although the buffer size is set to
+ * PAGE_SIZE, and TRACE_MAX_PRINT is 1000, this is just
+ * an extra layer of protection.
+ */
+ if (WARN_ON_ONCE(s->seq.len >= s->seq.size))
+ s->seq.len = s->seq.size - 1;
/* should be zero ended, but we are paranoid. */
- s->buffer[s->len] = 0;
+ s->buffer[s->seq.len] = 0;
printk(KERN_TRACE "%s", s->buffer);
return ret;
}
+void __init trace_init(void)
+{
+ if (tracepoint_printk) {
+ tracepoint_print_iter =
+ kmalloc(sizeof(*tracepoint_print_iter), GFP_KERNEL);
+ if (WARN_ON(!tracepoint_print_iter))
+ tracepoint_printk = 0;
+ }
+ tracer_alloc_buffers();
+ init_ftrace_syscalls();
+ trace_event_init();
+}
+
__init static int clear_boot_tracer(void)
{
/*
return 0;
}
-early_initcall(tracer_alloc_buffers);
fs_initcall(tracer_init_debugfs);
late_initcall(clear_boot_tracer);
projects / cascardo / linux.git / blobdiff