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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
commitb4b7ff4b08e691656c9d77c758fc355833128ac0 (patch)
tree82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /kernel/trace/trace.c
parent35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff)
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r--kernel/trace/trace.c470
1 files changed, 299 insertions, 171 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 6e7940867..87fb9801b 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -100,8 +100,6 @@ static DEFINE_PER_CPU(bool, trace_cmdline_save);
*/
static int tracing_disabled = 1;
-DEFINE_PER_CPU(int, ftrace_cpu_disabled);
-
cpumask_var_t __read_mostly tracing_buffer_mask;
/*
@@ -214,12 +212,10 @@ __setup("alloc_snapshot", boot_alloc_snapshot);
static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata;
-static char *trace_boot_options __initdata;
static int __init set_trace_boot_options(char *str)
{
strlcpy(trace_boot_options_buf, str, MAX_TRACER_SIZE);
- trace_boot_options = trace_boot_options_buf;
return 0;
}
__setup("trace_options=", set_trace_boot_options);
@@ -250,6 +246,19 @@ unsigned long long ns2usecs(cycle_t nsec)
return nsec;
}
+/* trace_flags holds trace_options default values */
+#define TRACE_DEFAULT_FLAGS \
+ (FUNCTION_DEFAULT_FLAGS | \
+ TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | \
+ TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | \
+ TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE | \
+ TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS)
+
+/* trace_options that are only supported by global_trace */
+#define TOP_LEVEL_TRACE_FLAGS (TRACE_ITER_PRINTK | \
+ TRACE_ITER_PRINTK_MSGONLY | TRACE_ITER_RECORD_CMD)
+
+
/*
* The global_trace is the descriptor that holds the tracing
* buffers for the live tracing. For each CPU, it contains
@@ -262,7 +271,9 @@ unsigned long long ns2usecs(cycle_t nsec)
* pages for the buffer for that CPU. Each CPU has the same number
* of pages allocated for its buffer.
*/
-static struct trace_array global_trace;
+static struct trace_array global_trace = {
+ .trace_flags = TRACE_DEFAULT_FLAGS,
+};
LIST_HEAD(ftrace_trace_arrays);
@@ -468,11 +479,29 @@ static inline void trace_access_lock_init(void)
#endif
-/* trace_flags holds trace_options default values */
-unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
- TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME |
- TRACE_ITER_GRAPH_TIME | TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE |
- TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS | TRACE_ITER_FUNCTION;
+#ifdef CONFIG_STACKTRACE
+static void __ftrace_trace_stack(struct ring_buffer *buffer,
+ unsigned long flags,
+ int skip, int pc, struct pt_regs *regs);
+static inline void ftrace_trace_stack(struct trace_array *tr,
+ struct ring_buffer *buffer,
+ unsigned long flags,
+ int skip, int pc, struct pt_regs *regs);
+
+#else
+static inline void __ftrace_trace_stack(struct ring_buffer *buffer,
+ unsigned long flags,
+ int skip, int pc, struct pt_regs *regs)
+{
+}
+static inline void ftrace_trace_stack(struct trace_array *tr,
+ struct ring_buffer *buffer,
+ unsigned long flags,
+ int skip, int pc, struct pt_regs *regs)
+{
+}
+
+#endif
static void tracer_tracing_on(struct trace_array *tr)
{
@@ -518,7 +547,7 @@ int __trace_puts(unsigned long ip, const char *str, int size)
int alloc;
int pc;
- if (!(trace_flags & TRACE_ITER_PRINTK))
+ if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
return 0;
pc = preempt_count();
@@ -548,7 +577,7 @@ int __trace_puts(unsigned long ip, const char *str, int size)
entry->buf[size] = '\0';
__buffer_unlock_commit(buffer, event);
- ftrace_trace_stack(buffer, irq_flags, 4, pc);
+ ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL);
return size;
}
@@ -568,7 +597,7 @@ int __trace_bputs(unsigned long ip, const char *str)
int size = sizeof(struct bputs_entry);
int pc;
- if (!(trace_flags & TRACE_ITER_PRINTK))
+ if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
return 0;
pc = preempt_count();
@@ -588,7 +617,7 @@ int __trace_bputs(unsigned long ip, const char *str)
entry->str = str;
__buffer_unlock_commit(buffer, event);
- ftrace_trace_stack(buffer, irq_flags, 4, pc);
+ ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL);
return 1;
}
@@ -834,34 +863,18 @@ unsigned long nsecs_to_usecs(unsigned long nsecs)
return nsecs / 1000;
}
+/*
+ * TRACE_FLAGS is defined as a tuple matching bit masks with strings.
+ * It uses C(a, b) where 'a' is the enum name and 'b' is the string that
+ * matches it. By defining "C(a, b) b", TRACE_FLAGS becomes a list
+ * of strings in the order that the enums were defined.
+ */
+#undef C
+#define C(a, b) b
+
/* These must match the bit postions in trace_iterator_flags */
static const char *trace_options[] = {
- "print-parent",
- "sym-offset",
- "sym-addr",
- "verbose",
- "raw",
- "hex",
- "bin",
- "block",
- "stacktrace",
- "trace_printk",
- "ftrace_preempt",
- "branch",
- "annotate",
- "userstacktrace",
- "sym-userobj",
- "printk-msg-only",
- "context-info",
- "latency-format",
- "sleep-time",
- "graph-time",
- "record-cmd",
- "overwrite",
- "disable_on_free",
- "irq-info",
- "markers",
- "function-trace",
+ TRACE_FLAGS
NULL
};
@@ -1204,13 +1217,17 @@ static inline int run_tracer_selftest(struct tracer *type)
}
#endif /* CONFIG_FTRACE_STARTUP_TEST */
+static void add_tracer_options(struct trace_array *tr, struct tracer *t);
+
+static void __init apply_trace_boot_options(void);
+
/**
* register_tracer - register a tracer with the ftrace system.
* @type - the plugin for the tracer
*
* Register a new plugin tracer.
*/
-int register_tracer(struct tracer *type)
+int __init register_tracer(struct tracer *type)
{
struct tracer *t;
int ret = 0;
@@ -1253,6 +1270,7 @@ int register_tracer(struct tracer *type)
type->next = trace_types;
trace_types = type;
+ add_tracer_options(&global_trace, type);
out:
tracing_selftest_running = false;
@@ -1268,6 +1286,9 @@ int register_tracer(struct tracer *type)
/* Do we want this tracer to start on bootup? */
tracing_set_tracer(&global_trace, type->name);
default_bootup_tracer = NULL;
+
+ apply_trace_boot_options();
+
/* disable other selftests, since this will break it. */
tracing_selftest_disabled = true;
#ifdef CONFIG_FTRACE_STARTUP_TEST
@@ -1671,23 +1692,16 @@ __buffer_unlock_commit(struct ring_buffer *buffer, struct ring_buffer_event *eve
ring_buffer_unlock_commit(buffer, event);
}
-static inline void
-__trace_buffer_unlock_commit(struct ring_buffer *buffer,
- struct ring_buffer_event *event,
- unsigned long flags, int pc)
+void trace_buffer_unlock_commit(struct trace_array *tr,
+ struct ring_buffer *buffer,
+ struct ring_buffer_event *event,
+ unsigned long flags, int pc)
{
__buffer_unlock_commit(buffer, event);
- ftrace_trace_stack(buffer, flags, 6, pc);
+ ftrace_trace_stack(tr, buffer, flags, 6, pc, NULL);
ftrace_trace_userstack(buffer, flags, pc);
}
-
-void trace_buffer_unlock_commit(struct ring_buffer *buffer,
- struct ring_buffer_event *event,
- unsigned long flags, int pc)
-{
- __trace_buffer_unlock_commit(buffer, event, flags, pc);
-}
EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit);
static struct ring_buffer *temp_buffer;
@@ -1729,22 +1743,15 @@ trace_current_buffer_lock_reserve(struct ring_buffer **current_rb,
}
EXPORT_SYMBOL_GPL(trace_current_buffer_lock_reserve);
-void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
- struct ring_buffer_event *event,
- unsigned long flags, int pc)
-{
- __trace_buffer_unlock_commit(buffer, event, flags, pc);
-}
-EXPORT_SYMBOL_GPL(trace_current_buffer_unlock_commit);
-
-void trace_buffer_unlock_commit_regs(struct ring_buffer *buffer,
+void trace_buffer_unlock_commit_regs(struct trace_array *tr,
+ struct ring_buffer *buffer,
struct ring_buffer_event *event,
unsigned long flags, int pc,
struct pt_regs *regs)
{
__buffer_unlock_commit(buffer, event);
- ftrace_trace_stack_regs(buffer, flags, 0, pc, regs);
+ ftrace_trace_stack(tr, buffer, flags, 6, pc, regs);
ftrace_trace_userstack(buffer, flags, pc);
}
EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit_regs);
@@ -1766,10 +1773,6 @@ trace_function(struct trace_array *tr,
struct ring_buffer_event *event;
struct ftrace_entry *entry;
- /* If we are reading the ring buffer, don't trace */
- if (unlikely(__this_cpu_read(ftrace_cpu_disabled)))
- return;
-
event = trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry),
flags, pc);
if (!event)
@@ -1873,24 +1876,17 @@ static void __ftrace_trace_stack(struct ring_buffer *buffer,
}
-void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
- int skip, int pc, struct pt_regs *regs)
+static inline void ftrace_trace_stack(struct trace_array *tr,
+ struct ring_buffer *buffer,
+ unsigned long flags,
+ int skip, int pc, struct pt_regs *regs)
{
- if (!(trace_flags & TRACE_ITER_STACKTRACE))
+ if (!(tr->trace_flags & TRACE_ITER_STACKTRACE))
return;
__ftrace_trace_stack(buffer, flags, skip, pc, regs);
}
-void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
- int skip, int pc)
-{
- if (!(trace_flags & TRACE_ITER_STACKTRACE))
- return;
-
- __ftrace_trace_stack(buffer, flags, skip, pc, NULL);
-}
-
void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
int pc)
{
@@ -1929,7 +1925,7 @@ ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc)
struct userstack_entry *entry;
struct stack_trace trace;
- if (!(trace_flags & TRACE_ITER_USERSTACKTRACE))
+ if (!(global_trace.trace_flags & TRACE_ITER_USERSTACKTRACE))
return;
/*
@@ -2173,7 +2169,7 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
memcpy(entry->buf, tbuffer, sizeof(u32) * len);
if (!call_filter_check_discard(call, entry, buffer, event)) {
__buffer_unlock_commit(buffer, event);
- ftrace_trace_stack(buffer, flags, 6, pc);
+ ftrace_trace_stack(tr, buffer, flags, 6, pc, NULL);
}
out:
@@ -2225,7 +2221,7 @@ __trace_array_vprintk(struct ring_buffer *buffer,
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);
+ ftrace_trace_stack(&global_trace, buffer, flags, 6, pc, NULL);
}
out:
preempt_enable_notrace();
@@ -2246,7 +2242,7 @@ int trace_array_printk(struct trace_array *tr,
int ret;
va_list ap;
- if (!(trace_flags & TRACE_ITER_PRINTK))
+ if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
return 0;
va_start(ap, fmt);
@@ -2261,7 +2257,7 @@ int trace_array_printk_buf(struct ring_buffer *buffer,
int ret;
va_list ap;
- if (!(trace_flags & TRACE_ITER_PRINTK))
+ if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
return 0;
va_start(ap, fmt);
@@ -2602,7 +2598,7 @@ static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file
void
print_trace_header(struct seq_file *m, struct trace_iterator *iter)
{
- unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
+ unsigned long sym_flags = (global_trace.trace_flags & TRACE_ITER_SYM_MASK);
struct trace_buffer *buf = iter->trace_buffer;
struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu);
struct tracer *type = iter->trace;
@@ -2664,20 +2660,22 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
static void test_cpu_buff_start(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
+ struct trace_array *tr = iter->tr;
- if (!(trace_flags & TRACE_ITER_ANNOTATE))
+ if (!(tr->trace_flags & TRACE_ITER_ANNOTATE))
return;
if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
return;
- if (cpumask_test_cpu(iter->cpu, iter->started))
+ if (iter->started && cpumask_test_cpu(iter->cpu, iter->started))
return;
if (per_cpu_ptr(iter->trace_buffer->data, iter->cpu)->skipped_entries)
return;
- cpumask_set_cpu(iter->cpu, iter->started);
+ if (iter->started)
+ cpumask_set_cpu(iter->cpu, iter->started);
/* Don't print started cpu buffer for the first entry of the trace */
if (iter->idx > 1)
@@ -2687,8 +2685,9 @@ static void test_cpu_buff_start(struct trace_iterator *iter)
static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
- unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
+ unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK);
struct trace_entry *entry;
struct trace_event *event;
@@ -2698,7 +2697,7 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
event = ftrace_find_event(entry->type);
- if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+ if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
if (iter->iter_flags & TRACE_FILE_LAT_FMT)
trace_print_lat_context(iter);
else
@@ -2718,13 +2717,14 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
struct trace_entry *entry;
struct trace_event *event;
entry = iter->ent;
- if (trace_flags & TRACE_ITER_CONTEXT_INFO)
+ if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO)
trace_seq_printf(s, "%d %d %llu ",
entry->pid, iter->cpu, iter->ts);
@@ -2742,6 +2742,7 @@ static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
unsigned char newline = '\n';
struct trace_entry *entry;
@@ -2749,7 +2750,7 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
entry = iter->ent;
- if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+ if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
SEQ_PUT_HEX_FIELD(s, entry->pid);
SEQ_PUT_HEX_FIELD(s, iter->cpu);
SEQ_PUT_HEX_FIELD(s, iter->ts);
@@ -2771,13 +2772,14 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
struct trace_entry *entry;
struct trace_event *event;
entry = iter->ent;
- if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+ if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
SEQ_PUT_FIELD(s, entry->pid);
SEQ_PUT_FIELD(s, iter->cpu);
SEQ_PUT_FIELD(s, iter->ts);
@@ -2826,6 +2828,8 @@ int trace_empty(struct trace_iterator *iter)
/* Called with trace_event_read_lock() held. */
enum print_line_t print_trace_line(struct trace_iterator *iter)
{
+ struct trace_array *tr = iter->tr;
+ unsigned long trace_flags = tr->trace_flags;
enum print_line_t ret;
if (iter->lost_events) {
@@ -2871,6 +2875,7 @@ enum print_line_t print_trace_line(struct trace_iterator *iter)
void trace_latency_header(struct seq_file *m)
{
struct trace_iterator *iter = m->private;
+ struct trace_array *tr = iter->tr;
/* print nothing if the buffers are empty */
if (trace_empty(iter))
@@ -2879,13 +2884,15 @@ void trace_latency_header(struct seq_file *m)
if (iter->iter_flags & TRACE_FILE_LAT_FMT)
print_trace_header(m, iter);
- if (!(trace_flags & TRACE_ITER_VERBOSE))
+ if (!(tr->trace_flags & TRACE_ITER_VERBOSE))
print_lat_help_header(m);
}
void trace_default_header(struct seq_file *m)
{
struct trace_iterator *iter = m->private;
+ struct trace_array *tr = iter->tr;
+ unsigned long trace_flags = tr->trace_flags;
if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
return;
@@ -3230,7 +3237,7 @@ static int tracing_open(struct inode *inode, struct file *file)
iter = __tracing_open(inode, file, false);
if (IS_ERR(iter))
ret = PTR_ERR(iter);
- else if (trace_flags & TRACE_ITER_LATENCY_FMT)
+ else if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
iter->iter_flags |= TRACE_FILE_LAT_FMT;
}
@@ -3477,7 +3484,7 @@ static int tracing_trace_options_show(struct seq_file *m, void *v)
trace_opts = tr->current_trace->flags->opts;
for (i = 0; trace_options[i]; i++) {
- if (trace_flags & (1 << i))
+ if (tr->trace_flags & (1 << i))
seq_printf(m, "%s\n", trace_options[i]);
else
seq_printf(m, "no%s\n", trace_options[i]);
@@ -3542,7 +3549,7 @@ int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set)
int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
{
/* do nothing if flag is already set */
- if (!!(trace_flags & mask) == !!enabled)
+ if (!!(tr->trace_flags & mask) == !!enabled)
return 0;
/* Give the tracer a chance to approve the change */
@@ -3551,9 +3558,9 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
return -EINVAL;
if (enabled)
- trace_flags |= mask;
+ tr->trace_flags |= mask;
else
- trace_flags &= ~mask;
+ tr->trace_flags &= ~mask;
if (mask == TRACE_ITER_RECORD_CMD)
trace_event_enable_cmd_record(enabled);
@@ -3565,8 +3572,10 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
#endif
}
- if (mask == TRACE_ITER_PRINTK)
+ if (mask == TRACE_ITER_PRINTK) {
trace_printk_start_stop_comm(enabled);
+ trace_printk_control(enabled);
+ }
return 0;
}
@@ -3577,6 +3586,7 @@ static int trace_set_options(struct trace_array *tr, char *option)
int neg = 0;
int ret = -ENODEV;
int i;
+ size_t orig_len = strlen(option);
cmp = strstrip(option);
@@ -3600,9 +3610,36 @@ static int trace_set_options(struct trace_array *tr, char *option)
mutex_unlock(&trace_types_lock);
+ /*
+ * If the first trailing whitespace is replaced with '\0' by strstrip,
+ * turn it back into a space.
+ */
+ if (orig_len > strlen(option))
+ option[strlen(option)] = ' ';
+
return ret;
}
+static void __init apply_trace_boot_options(void)
+{
+ char *buf = trace_boot_options_buf;
+ char *option;
+
+ while (true) {
+ option = strsep(&buf, ",");
+
+ if (!option)
+ break;
+
+ if (*option)
+ trace_set_options(&global_trace, option);
+
+ /* Put back the comma to allow this to be called again */
+ if (buf)
+ *(buf - 1) = ',';
+ }
+}
+
static ssize_t
tracing_trace_options_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
@@ -4297,11 +4334,8 @@ int tracing_update_buffers(void)
struct trace_option_dentry;
-static struct trace_option_dentry *
-create_trace_option_files(struct trace_array *tr, struct tracer *tracer);
-
static void
-destroy_trace_option_files(struct trace_option_dentry *topts);
+create_trace_option_files(struct trace_array *tr, struct tracer *tracer);
/*
* Used to clear out the tracer before deletion of an instance.
@@ -4320,20 +4354,13 @@ static void tracing_set_nop(struct trace_array *tr)
tr->current_trace = &nop_trace;
}
-static void update_tracer_options(struct trace_array *tr, struct tracer *t)
+static void add_tracer_options(struct trace_array *tr, struct tracer *t)
{
- static struct trace_option_dentry *topts;
-
/* Only enable if the directory has been created already. */
if (!tr->dir)
return;
- /* Currently, only the top instance has options */
- if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL))
- return;
-
- destroy_trace_option_files(topts);
- topts = create_trace_option_files(tr, t);
+ create_trace_option_files(tr, t);
}
static int tracing_set_tracer(struct trace_array *tr, const char *buf)
@@ -4402,7 +4429,6 @@ static int tracing_set_tracer(struct trace_array *tr, const char *buf)
free_snapshot(tr);
}
#endif
- update_tracer_options(tr, t);
#ifdef CONFIG_TRACER_MAX_TRACE
if (t->use_max_tr && !had_max_tr) {
@@ -4522,6 +4548,8 @@ out:
return ret;
}
+#ifdef CONFIG_TRACER_MAX_TRACE
+
static ssize_t
tracing_max_lat_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
@@ -4536,6 +4564,8 @@ tracing_max_lat_write(struct file *filp, const char __user *ubuf,
return tracing_nsecs_write(filp->private_data, ubuf, cnt, ppos);
}
+#endif
+
static int tracing_open_pipe(struct inode *inode, struct file *filp)
{
struct trace_array *tr = inode->i_private;
@@ -4569,7 +4599,7 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
/* trace pipe does not show start of buffer */
cpumask_setall(iter->started);
- if (trace_flags & TRACE_ITER_LATENCY_FMT)
+ if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
iter->iter_flags |= TRACE_FILE_LAT_FMT;
/* Output in nanoseconds only if we are using a clock in nanoseconds. */
@@ -4626,11 +4656,13 @@ static int tracing_release_pipe(struct inode *inode, struct file *file)
static unsigned int
trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table)
{
+ struct trace_array *tr = iter->tr;
+
/* Iterators are static, they should be filled or empty */
if (trace_buffer_iter(iter, iter->cpu_file))
return POLLIN | POLLRDNORM;
- if (trace_flags & TRACE_ITER_BLOCK)
+ if (tr->trace_flags & TRACE_ITER_BLOCK)
/*
* Always select as readable when in blocking mode
*/
@@ -5047,7 +5079,7 @@ tracing_free_buffer_release(struct inode *inode, struct file *filp)
struct trace_array *tr = inode->i_private;
/* disable tracing ? */
- if (trace_flags & TRACE_ITER_STOP_ON_FREE)
+ if (tr->trace_flags & TRACE_ITER_STOP_ON_FREE)
tracer_tracing_off(tr);
/* resize the ring buffer to 0 */
tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS);
@@ -5080,7 +5112,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
if (tracing_disabled)
return -EINVAL;
- if (!(trace_flags & TRACE_ITER_MARKERS))
+ if (!(tr->trace_flags & TRACE_ITER_MARKERS))
return -EINVAL;
if (cnt > TRACE_BUF_SIZE)
@@ -5435,12 +5467,14 @@ static const struct file_operations tracing_thresh_fops = {
.llseek = generic_file_llseek,
};
+#ifdef CONFIG_TRACER_MAX_TRACE
static const struct file_operations tracing_max_lat_fops = {
.open = tracing_open_generic,
.read = tracing_max_lat_read,
.write = tracing_max_lat_write,
.llseek = generic_file_llseek,
};
+#endif
static const struct file_operations set_tracer_fops = {
.open = tracing_open_generic,
@@ -6132,13 +6166,6 @@ tracing_init_tracefs_percpu(struct trace_array *tr, long cpu)
#include "trace_selftest.c"
#endif
-struct trace_option_dentry {
- struct tracer_opt *opt;
- struct tracer_flags *flags;
- struct trace_array *tr;
- struct dentry *entry;
-};
-
static ssize_t
trace_options_read(struct file *filp, char __user *ubuf, size_t cnt,
loff_t *ppos)
@@ -6191,14 +6218,51 @@ static const struct file_operations trace_options_fops = {
.llseek = generic_file_llseek,
};
+/*
+ * In order to pass in both the trace_array descriptor as well as the index
+ * to the flag that the trace option file represents, the trace_array
+ * has a character array of trace_flags_index[], which holds the index
+ * of the bit for the flag it represents. index[0] == 0, index[1] == 1, etc.
+ * The address of this character array is passed to the flag option file
+ * read/write callbacks.
+ *
+ * In order to extract both the index and the trace_array descriptor,
+ * get_tr_index() uses the following algorithm.
+ *
+ * idx = *ptr;
+ *
+ * As the pointer itself contains the address of the index (remember
+ * index[1] == 1).
+ *
+ * Then to get the trace_array descriptor, by subtracting that index
+ * from the ptr, we get to the start of the index itself.
+ *
+ * ptr - idx == &index[0]
+ *
+ * Then a simple container_of() from that pointer gets us to the
+ * trace_array descriptor.
+ */
+static void get_tr_index(void *data, struct trace_array **ptr,
+ unsigned int *pindex)
+{
+ *pindex = *(unsigned char *)data;
+
+ *ptr = container_of(data - *pindex, struct trace_array,
+ trace_flags_index);
+}
+
static ssize_t
trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt,
loff_t *ppos)
{
- long index = (long)filp->private_data;
+ void *tr_index = filp->private_data;
+ struct trace_array *tr;
+ unsigned int index;
char *buf;
- if (trace_flags & (1 << index))
+ get_tr_index(tr_index, &tr, &index);
+
+ if (tr->trace_flags & (1 << index))
buf = "1\n";
else
buf = "0\n";
@@ -6210,11 +6274,14 @@ static ssize_t
trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt,
loff_t *ppos)
{
- struct trace_array *tr = &global_trace;
- long index = (long)filp->private_data;
+ void *tr_index = filp->private_data;
+ struct trace_array *tr;
+ unsigned int index;
unsigned long val;
int ret;
+ get_tr_index(tr_index, &tr, &index);
+
ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
if (ret)
return ret;
@@ -6298,21 +6365,39 @@ create_trace_option_file(struct trace_array *tr,
}
-static struct trace_option_dentry *
+static void
create_trace_option_files(struct trace_array *tr, struct tracer *tracer)
{
struct trace_option_dentry *topts;
+ struct trace_options *tr_topts;
struct tracer_flags *flags;
struct tracer_opt *opts;
int cnt;
+ int i;
if (!tracer)
- return NULL;
+ return;
flags = tracer->flags;
if (!flags || !flags->opts)
- return NULL;
+ return;
+
+ /*
+ * If this is an instance, only create flags for tracers
+ * the instance may have.
+ */
+ if (!trace_ok_for_array(tracer, tr))
+ return;
+
+ for (i = 0; i < tr->nr_topts; i++) {
+ /*
+ * Check if these flags have already been added.
+ * Some tracers share flags.
+ */
+ if (tr->topts[i].tracer->flags == tracer->flags)
+ return;
+ }
opts = flags->opts;
@@ -6321,27 +6406,27 @@ create_trace_option_files(struct trace_array *tr, struct tracer *tracer)
topts = kcalloc(cnt + 1, sizeof(*topts), GFP_KERNEL);
if (!topts)
- return NULL;
-
- for (cnt = 0; opts[cnt].name; cnt++)
- create_trace_option_file(tr, &topts[cnt], flags,
- &opts[cnt]);
-
- return topts;
-}
-
-static void
-destroy_trace_option_files(struct trace_option_dentry *topts)
-{
- int cnt;
+ return;
- if (!topts)
+ tr_topts = krealloc(tr->topts, sizeof(*tr->topts) * (tr->nr_topts + 1),
+ GFP_KERNEL);
+ if (!tr_topts) {
+ kfree(topts);
return;
+ }
- for (cnt = 0; topts[cnt].opt; cnt++)
- tracefs_remove(topts[cnt].entry);
+ tr->topts = tr_topts;
+ tr->topts[tr->nr_topts].tracer = tracer;
+ tr->topts[tr->nr_topts].topts = topts;
+ tr->nr_topts++;
- kfree(topts);
+ for (cnt = 0; opts[cnt].name; cnt++) {
+ create_trace_option_file(tr, &topts[cnt], flags,
+ &opts[cnt]);
+ WARN_ONCE(topts[cnt].entry == NULL,
+ "Failed to create trace option: %s",
+ opts[cnt].name);
+ }
}
static struct dentry *
@@ -6354,21 +6439,26 @@ create_trace_option_core_file(struct trace_array *tr,
if (!t_options)
return NULL;
- return trace_create_file(option, 0644, t_options, (void *)index,
- &trace_options_core_fops);
+ return trace_create_file(option, 0644, t_options,
+ (void *)&tr->trace_flags_index[index],
+ &trace_options_core_fops);
}
-static __init void create_trace_options_dir(struct trace_array *tr)
+static void create_trace_options_dir(struct trace_array *tr)
{
struct dentry *t_options;
+ bool top_level = tr == &global_trace;
int i;
t_options = trace_options_init_dentry(tr);
if (!t_options)
return;
- for (i = 0; trace_options[i]; i++)
- create_trace_option_core_file(tr, trace_options[i], i);
+ for (i = 0; trace_options[i]; i++) {
+ if (top_level ||
+ !((1 << i) & TOP_LEVEL_TRACE_FLAGS))
+ create_trace_option_core_file(tr, trace_options[i], i);
+ }
}
static ssize_t
@@ -6435,7 +6525,7 @@ allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size
{
enum ring_buffer_flags rb_flags;
- rb_flags = trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0;
+ rb_flags = tr->trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0;
buf->tr = tr;
@@ -6505,6 +6595,30 @@ static void free_trace_buffers(struct trace_array *tr)
#endif
}
+static void init_trace_flags_index(struct trace_array *tr)
+{
+ int i;
+
+ /* Used by the trace options files */
+ for (i = 0; i < TRACE_FLAGS_MAX_SIZE; i++)
+ tr->trace_flags_index[i] = i;
+}
+
+static void __update_tracer_options(struct trace_array *tr)
+{
+ struct tracer *t;
+
+ for (t = trace_types; t; t = t->next)
+ add_tracer_options(tr, t);
+}
+
+static void update_tracer_options(struct trace_array *tr)
+{
+ mutex_lock(&trace_types_lock);
+ __update_tracer_options(tr);
+ mutex_unlock(&trace_types_lock);
+}
+
static int instance_mkdir(const char *name)
{
struct trace_array *tr;
@@ -6530,6 +6644,8 @@ static int instance_mkdir(const char *name)
if (!alloc_cpumask_var(&tr->tracing_cpumask, GFP_KERNEL))
goto out_free_tr;
+ tr->trace_flags = global_trace.trace_flags;
+
cpumask_copy(tr->tracing_cpumask, cpu_all_mask);
raw_spin_lock_init(&tr->start_lock);
@@ -6555,6 +6671,8 @@ static int instance_mkdir(const char *name)
}
init_tracer_tracefs(tr, tr->dir);
+ init_trace_flags_index(tr);
+ __update_tracer_options(tr);
list_add(&tr->list, &ftrace_trace_arrays);
@@ -6580,6 +6698,7 @@ static int instance_rmdir(const char *name)
struct trace_array *tr;
int found = 0;
int ret;
+ int i;
mutex_lock(&trace_types_lock);
@@ -6602,9 +6721,14 @@ static int instance_rmdir(const char *name)
tracing_set_nop(tr);
event_trace_del_tracer(tr);
ftrace_destroy_function_files(tr);
- debugfs_remove_recursive(tr->dir);
+ tracefs_remove_recursive(tr->dir);
free_trace_buffers(tr);
+ for (i = 0; i < tr->nr_topts; i++) {
+ kfree(tr->topts[i].topts);
+ }
+ kfree(tr->topts);
+
kfree(tr->name);
kfree(tr);
@@ -6666,6 +6790,8 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
trace_create_file("tracing_on", 0644, d_tracer,
tr, &rb_simple_fops);
+ create_trace_options_dir(tr);
+
#ifdef CONFIG_TRACER_MAX_TRACE
trace_create_file("tracing_max_latency", 0644, d_tracer,
&tr->max_latency, &tracing_max_lat_fops);
@@ -6721,7 +6847,9 @@ struct dentry *tracing_init_dentry(void)
if (tr->dir)
return NULL;
- if (WARN_ON(!debugfs_initialized()))
+ if (WARN_ON(!tracefs_initialized()) ||
+ (IS_ENABLED(CONFIG_DEBUG_FS) &&
+ WARN_ON(!debugfs_initialized())))
return ERR_PTR(-ENODEV);
/*
@@ -6861,11 +6989,7 @@ static __init int tracer_init_tracefs(void)
create_trace_instances(d_tracer);
- create_trace_options_dir(&global_trace);
-
- /* If the tracer was started via cmdline, create options for it here */
- if (global_trace.current_trace != &nop_trace)
- update_tracer_options(&global_trace, global_trace.current_trace);
+ update_tracer_options(&global_trace);
return 0;
}
@@ -6964,6 +7088,7 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
/* use static because iter can be a bit big for the stack */
static struct trace_iterator iter;
static atomic_t dump_running;
+ struct trace_array *tr = &global_trace;
unsigned int old_userobj;
unsigned long flags;
int cnt = 0, cpu;
@@ -6993,10 +7118,10 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
}
- old_userobj = trace_flags & TRACE_ITER_SYM_USEROBJ;
+ old_userobj = tr->trace_flags & TRACE_ITER_SYM_USEROBJ;
/* don't look at user memory in panic mode */
- trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
+ tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
switch (oops_dump_mode) {
case DUMP_ALL:
@@ -7059,7 +7184,7 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
printk(KERN_TRACE "---------------------------------\n");
out_enable:
- trace_flags |= old_userobj;
+ tr->trace_flags |= old_userobj;
for_each_tracing_cpu(cpu) {
atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
@@ -7074,6 +7199,12 @@ __init static int tracer_alloc_buffers(void)
int ring_buf_size;
int ret = -ENOMEM;
+ /*
+ * Make sure we don't accidently add more trace options
+ * than we have bits for.
+ */
+ BUILD_BUG_ON(TRACE_ITER_LAST_BIT > TRACE_FLAGS_MAX_SIZE);
+
if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL))
goto out;
@@ -7132,6 +7263,8 @@ __init static int tracer_alloc_buffers(void)
ftrace_init_global_array_ops(&global_trace);
+ init_trace_flags_index(&global_trace);
+
register_tracer(&nop_trace);
/* All seems OK, enable tracing */
@@ -7148,12 +7281,7 @@ __init static int tracer_alloc_buffers(void)
INIT_LIST_HEAD(&global_trace.events);
list_add(&global_trace.list, &ftrace_trace_arrays);
- while (trace_boot_options) {
- char *option;
-
- option = strsep(&trace_boot_options, ",");
- trace_set_options(&global_trace, option);
- }
+ apply_trace_boot_options();
register_snapshot_cmd();