#include <linux/fs.h>
#include <linux/kprobes.h>
#include <linux/writeback.h>
+#include <linux/splice.h>
#include <linux/stacktrace.h>
#include <linux/ring_buffer.h>
#include <linux/irqflags.h>
#include "trace.h"
+#include "trace_output.h"
#define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE)
-unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX;
+unsigned long __read_mostly tracing_max_latency;
unsigned long __read_mostly tracing_thresh;
+/*
+ * We need to change this state when a selftest is running.
+ * A selftest will lurk into the ring-buffer to count the
+ * entries inserted during the selftest although some concurrent
+ * insertions into the ring-buffer such as ftrace_printk could occurred
+ * at the same time, giving false positive or negative results.
+ */
+static bool __read_mostly tracing_selftest_running;
+
+/*
+ * If a tracer is running, we do not want to run SELFTEST.
+ */
+static bool __read_mostly tracing_selftest_disabled;
+
+/* For tracers that don't implement custom flags */
+static struct tracer_opt dummy_tracer_opt[] = {
+ { }
+};
+
+static struct tracer_flags dummy_tracer_flags = {
+ .val = 0,
+ .opts = dummy_tracer_opt
+};
+
+static int dummy_set_flag(u32 old_flags, u32 bit, int set)
+{
+ return 0;
+}
+
+/*
+ * Kill all tracing for good (never come back).
+ * It is initialized to 1 but will turn to zero if the initialization
+ * of the tracer is successful. But that is the only place that sets
+ * this back to zero.
+ */
+int tracing_disabled = 1;
+
static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled);
static inline void ftrace_disable_cpu(void)
preempt_enable();
}
-static cpumask_t __read_mostly tracing_buffer_mask;
+static cpumask_var_t __read_mostly tracing_buffer_mask;
#define for_each_tracing_cpu(cpu) \
- for_each_cpu_mask(cpu, tracing_buffer_mask)
+ for_each_cpu(cpu, tracing_buffer_mask)
+
+/*
+ * ftrace_dump_on_oops - variable to dump ftrace buffer on oops
+ *
+ * If there is an oops (or kernel panic) and the ftrace_dump_on_oops
+ * is set, then ftrace_dump is called. This will output the contents
+ * of the ftrace buffers to the console. This is very useful for
+ * capturing traces that lead to crashes and outputing it to a
+ * serial console.
+ *
+ * It is default off, but you can enable it with either specifying
+ * "ftrace_dump_on_oops" in the kernel command line, or setting
+ * /proc/sys/kernel/ftrace_dump_on_oops to true.
+ */
+int ftrace_dump_on_oops;
+
+static int tracing_set_tracer(const char *buf);
+
+#define BOOTUP_TRACER_SIZE 100
+static char bootup_tracer_buf[BOOTUP_TRACER_SIZE] __initdata;
+static char *default_bootup_tracer;
-static int tracing_disabled = 1;
+static int __init set_ftrace(char *str)
+{
+ strncpy(bootup_tracer_buf, str, BOOTUP_TRACER_SIZE);
+ default_bootup_tracer = bootup_tracer_buf;
+ return 1;
+}
+__setup("ftrace=", set_ftrace);
+
+static int __init set_ftrace_dump_on_oops(char *str)
+{
+ ftrace_dump_on_oops = 1;
+ return 1;
+}
+__setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops);
long
ns2usecs(cycle_t nsec)
/* tracer_enabled is used to toggle activation of a tracer */
static int tracer_enabled = 1;
-/* function tracing enabled */
-int ftrace_function_enabled;
+/**
+ * tracing_is_enabled - return tracer_enabled status
+ *
+ * This function is used by other tracers to know the status
+ * of the tracer_enabled flag. Tracers may use this function
+ * to know if it should enable their features when starting
+ * up. See irqsoff tracer for an example (start_irqsoff_tracer).
+ */
+int tracing_is_enabled(void)
+{
+ return tracer_enabled;
+}
/*
* trace_buf_size is the size in bytes that is allocated
/* trace_wait is a waitqueue for tasks blocked on trace_poll */
static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
-/* trace_flags holds iter_ctrl options */
-unsigned long trace_flags = TRACE_ITER_PRINT_PARENT;
+/* 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_wake_up - wake up tasks waiting for trace input
return nsecs / 1000;
}
-/*
- * TRACE_ITER_SYM_MASK masks the options in trace_flags that
- * control the output of kernel symbols.
- */
-#define TRACE_ITER_SYM_MASK \
- (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
-
/* These must match the bit postions in trace_iterator_flags */
static const char *trace_options[] = {
"print-parent",
"stacktrace",
"sched-tree",
"ftrace_printk",
+ "ftrace_preempt",
+ "branch",
+ "annotate",
+ "userstacktrace",
+ "sym-userobj",
+ "printk-msg-only",
+ "context-info",
NULL
};
memcpy(data->comm, tsk->comm, TASK_COMM_LEN);
data->pid = tsk->pid;
- data->uid = tsk->uid;
+ data->uid = task_uid(tsk);
data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
data->policy = tsk->policy;
data->rt_priority = tsk->rt_priority;
tracing_record_cmdline(current);
}
-/**
- * trace_seq_printf - 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_printf(struct trace_seq *s, const char *fmt, ...)
-{
- int len = (PAGE_SIZE - 1) - s->len;
- va_list ap;
- int ret;
-
- if (!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)
- 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.
- */
-static int
-trace_seq_puts(struct trace_seq *s, const char *str)
-{
- int len = strlen(str);
-
- if (len > ((PAGE_SIZE - 1) - s->len))
- return 0;
-
- memcpy(s->buffer + s->len, str, len);
- s->len += len;
-
- return len;
-}
-
-static int
-trace_seq_putc(struct trace_seq *s, unsigned char c)
-{
- if (s->len >= (PAGE_SIZE - 1))
- return 0;
-
- s->buffer[s->len++] = c;
-
- return 1;
-}
-
-static int
-trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
-{
- if (len > ((PAGE_SIZE - 1) - s->len))
- return 0;
-
- memcpy(s->buffer + s->len, mem, len);
- s->len += len;
-
- return len;
-}
-
-#define MAX_MEMHEX_BYTES 8
-#define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1)
-
-static int
-trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
-{
- unsigned char hex[HEX_CHARS];
- unsigned char *data = mem;
- int i, j;
-
-#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);
-}
-
static void
trace_seq_reset(struct trace_seq *s)
{
return cnt;
}
+ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt)
+{
+ int len;
+ void *ret;
+
+ if (s->len <= s->readpos)
+ return -EBUSY;
+
+ len = s->len - s->readpos;
+ if (cnt > len)
+ cnt = len;
+ ret = memcpy(buf, s->buffer + s->readpos, cnt);
+ if (!ret)
+ return -EFAULT;
+
+ s->readpos += len;
+ return cnt;
+}
+
static void
trace_print_seq(struct seq_file *m, struct trace_seq *s)
{
ftrace_enable_cpu();
- WARN_ON_ONCE(ret);
+ WARN_ON_ONCE(ret && ret != -EAGAIN);
__update_max_tr(tr, tsk, cpu);
__raw_spin_unlock(&ftrace_max_lock);
return -1;
}
+ /*
+ * When this gets called we hold the BKL which means that
+ * preemption is disabled. Various trace selftests however
+ * need to disable and enable preemption for successful tests.
+ * So we drop the BKL here and grab it after the tests again.
+ */
+ unlock_kernel();
mutex_lock(&trace_types_lock);
+
+ tracing_selftest_running = true;
+
for (t = trace_types; t; t = t->next) {
if (strcmp(type->name, t->name) == 0) {
/* already found */
}
}
+ if (!type->set_flag)
+ type->set_flag = &dummy_set_flag;
+ if (!type->flags)
+ type->flags = &dummy_tracer_flags;
+ else
+ if (!type->flags->opts)
+ type->flags->opts = dummy_tracer_opt;
+
#ifdef CONFIG_FTRACE_STARTUP_TEST
- if (type->selftest) {
+ if (type->selftest && !tracing_selftest_disabled) {
struct tracer *saved_tracer = current_trace;
struct trace_array *tr = &global_trace;
- int saved_ctrl = tr->ctrl;
int i;
+
/*
* Run a selftest on this tracer.
* Here we reset the trace buffer, and set the current
* internal tracing to verify that everything is in order.
* If we fail, we do not register this tracer.
*/
- for_each_tracing_cpu(i) {
+ for_each_tracing_cpu(i)
tracing_reset(tr, i);
- }
+
current_trace = type;
- tr->ctrl = 0;
/* the test is responsible for initializing and enabling */
pr_info("Testing tracer %s: ", type->name);
ret = type->selftest(type, tr);
/* the test is responsible for resetting too */
current_trace = saved_tracer;
- tr->ctrl = saved_ctrl;
if (ret) {
printk(KERN_CONT "FAILED!\n");
goto out;
}
/* Only reset on passing, to avoid touching corrupted buffers */
- for_each_tracing_cpu(i) {
+ for_each_tracing_cpu(i)
tracing_reset(tr, i);
- }
+
printk(KERN_CONT "PASSED\n");
}
#endif
max_tracer_type_len = len;
out:
+ tracing_selftest_running = false;
mutex_unlock(&trace_types_lock);
+ if (ret || !default_bootup_tracer)
+ goto out_unlock;
+
+ if (strncmp(default_bootup_tracer, type->name, BOOTUP_TRACER_SIZE))
+ goto out_unlock;
+
+ printk(KERN_INFO "Starting tracer '%s'\n", type->name);
+ /* Do we want this tracer to start on bootup? */
+ tracing_set_tracer(type->name);
+ default_bootup_tracer = NULL;
+ /* disable other selftests, since this will break it. */
+ tracing_selftest_disabled = 1;
+#ifdef CONFIG_FTRACE_STARTUP_TEST
+ printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n",
+ type->name);
+#endif
+
+ out_unlock:
+ lock_kernel();
return ret;
}
found:
*t = (*t)->next;
+
+ if (type == current_trace && tracer_enabled) {
+ tracer_enabled = 0;
+ tracing_stop();
+ if (current_trace->stop)
+ current_trace->stop(&global_trace);
+ current_trace = &nop_trace;
+ }
+
if (strlen(type->name) != max_tracer_type_len)
goto out;
ftrace_enable_cpu();
}
+void tracing_reset_online_cpus(struct trace_array *tr)
+{
+ int cpu;
+
+ tr->time_start = ftrace_now(tr->cpu);
+
+ for_each_online_cpu(cpu)
+ tracing_reset(tr, cpu);
+}
+
#define SAVED_CMDLINES 128
static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
static unsigned map_cmdline_to_pid[SAVED_CMDLINES];
cmdline_idx = 0;
}
+static int trace_stop_count;
+static DEFINE_SPINLOCK(tracing_start_lock);
+
+/**
+ * ftrace_off_permanent - disable all ftrace code permanently
+ *
+ * This should only be called when a serious anomally has
+ * been detected. This will turn off the function tracing,
+ * ring buffers, and other tracing utilites. It takes no
+ * locks and can be called from any context.
+ */
+void ftrace_off_permanent(void)
+{
+ tracing_disabled = 1;
+ ftrace_stop();
+ tracing_off_permanent();
+}
+
+/**
+ * tracing_start - quick start of the tracer
+ *
+ * If tracing is enabled but was stopped by tracing_stop,
+ * this will start the tracer back up.
+ */
+void tracing_start(void)
+{
+ struct ring_buffer *buffer;
+ unsigned long flags;
+
+ if (tracing_disabled)
+ return;
+
+ spin_lock_irqsave(&tracing_start_lock, flags);
+ if (--trace_stop_count) {
+ if (trace_stop_count < 0) {
+ /* Someone screwed up their debugging */
+ WARN_ON_ONCE(1);
+ trace_stop_count = 0;
+ }
+ goto out;
+ }
+
+
+ buffer = global_trace.buffer;
+ if (buffer)
+ ring_buffer_record_enable(buffer);
+
+ buffer = max_tr.buffer;
+ if (buffer)
+ ring_buffer_record_enable(buffer);
+
+ ftrace_start();
+ out:
+ spin_unlock_irqrestore(&tracing_start_lock, flags);
+}
+
+/**
+ * tracing_stop - quick stop of the tracer
+ *
+ * Light weight way to stop tracing. Use in conjunction with
+ * tracing_start.
+ */
+void tracing_stop(void)
+{
+ struct ring_buffer *buffer;
+ unsigned long flags;
+
+ ftrace_stop();
+ spin_lock_irqsave(&tracing_start_lock, flags);
+ if (trace_stop_count++)
+ goto out;
+
+ buffer = global_trace.buffer;
+ if (buffer)
+ ring_buffer_record_disable(buffer);
+
+ buffer = max_tr.buffer;
+ if (buffer)
+ ring_buffer_record_disable(buffer);
+
+ out:
+ spin_unlock_irqrestore(&tracing_start_lock, flags);
+}
+
void trace_stop_cmdline_recording(void);
static void trace_save_cmdline(struct task_struct *tsk)
spin_unlock(&trace_cmdline_lock);
}
-static char *trace_find_cmdline(int pid)
+char *trace_find_cmdline(int pid)
{
char *cmdline = "<...>";
unsigned map;
entry->preempt_count = pc & 0xff;
entry->pid = (tsk) ? tsk->pid : 0;
+ entry->tgid = (tsk) ? tsk->tgid : 0;
entry->flags =
#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
(irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
(need_resched() ? TRACE_FLAG_NEED_RESCHED : 0);
}
+struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
+ unsigned char type,
+ unsigned long len,
+ unsigned long flags, int pc)
+{
+ struct ring_buffer_event *event;
+
+ event = ring_buffer_lock_reserve(tr->buffer, len);
+ if (event != NULL) {
+ struct trace_entry *ent = ring_buffer_event_data(event);
+
+ tracing_generic_entry_update(ent, flags, pc);
+ ent->type = type;
+ }
+
+ return event;
+}
+static void ftrace_trace_stack(struct trace_array *tr,
+ unsigned long flags, int skip, int pc);
+static void ftrace_trace_userstack(struct trace_array *tr,
+ unsigned long flags, int pc);
+
+void trace_buffer_unlock_commit(struct trace_array *tr,
+ struct ring_buffer_event *event,
+ unsigned long flags, int pc)
+{
+ ring_buffer_unlock_commit(tr->buffer, event);
+
+ ftrace_trace_stack(tr, flags, 6, pc);
+ ftrace_trace_userstack(tr, flags, pc);
+ trace_wake_up();
+}
+
void
-trace_function(struct trace_array *tr, struct trace_array_cpu *data,
+trace_function(struct trace_array *tr,
unsigned long ip, unsigned long parent_ip, unsigned long flags,
int pc)
{
struct ring_buffer_event *event;
struct ftrace_entry *entry;
- unsigned long irq_flags;
/* If we are reading the ring buffer, don't trace */
if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
return;
- event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
- &irq_flags);
+ event = trace_buffer_lock_reserve(tr, TRACE_FN, sizeof(*entry),
+ flags, pc);
if (!event)
return;
entry = ring_buffer_event_data(event);
- tracing_generic_entry_update(&entry->ent, flags, pc);
- entry->ent.type = TRACE_FN;
entry->ip = ip;
entry->parent_ip = parent_ip;
- ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+ ring_buffer_unlock_commit(tr->buffer, event);
}
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+static void __trace_graph_entry(struct trace_array *tr,
+ struct ftrace_graph_ent *trace,
+ unsigned long flags,
+ int pc)
+{
+ struct ring_buffer_event *event;
+ struct ftrace_graph_ent_entry *entry;
+
+ if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
+ return;
+
+ event = trace_buffer_lock_reserve(&global_trace, TRACE_GRAPH_ENT,
+ sizeof(*entry), flags, pc);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ entry->graph_ent = *trace;
+ ring_buffer_unlock_commit(global_trace.buffer, event);
+}
+
+static void __trace_graph_return(struct trace_array *tr,
+ struct ftrace_graph_ret *trace,
+ unsigned long flags,
+ int pc)
+{
+ struct ring_buffer_event *event;
+ struct ftrace_graph_ret_entry *entry;
+
+ if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
+ return;
+
+ event = trace_buffer_lock_reserve(&global_trace, TRACE_GRAPH_RET,
+ sizeof(*entry), flags, pc);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ entry->ret = *trace;
+ ring_buffer_unlock_commit(global_trace.buffer, event);
+}
+#endif
+
void
ftrace(struct trace_array *tr, struct trace_array_cpu *data,
unsigned long ip, unsigned long parent_ip, unsigned long flags,
int pc)
{
if (likely(!atomic_read(&data->disabled)))
- trace_function(tr, data, ip, parent_ip, flags, pc);
+ trace_function(tr, ip, parent_ip, flags, pc);
+}
+
+static void __ftrace_trace_stack(struct trace_array *tr,
+ unsigned long flags,
+ int skip, int pc)
+{
+#ifdef CONFIG_STACKTRACE
+ struct ring_buffer_event *event;
+ struct stack_entry *entry;
+ struct stack_trace trace;
+
+ event = trace_buffer_lock_reserve(tr, TRACE_STACK,
+ sizeof(*entry), flags, pc);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ memset(&entry->caller, 0, sizeof(entry->caller));
+
+ trace.nr_entries = 0;
+ trace.max_entries = FTRACE_STACK_ENTRIES;
+ trace.skip = skip;
+ trace.entries = entry->caller;
+
+ save_stack_trace(&trace);
+ ring_buffer_unlock_commit(tr->buffer, event);
+#endif
}
static void ftrace_trace_stack(struct trace_array *tr,
- struct trace_array_cpu *data,
unsigned long flags,
int skip, int pc)
+{
+ if (!(trace_flags & TRACE_ITER_STACKTRACE))
+ return;
+
+ __ftrace_trace_stack(tr, flags, skip, pc);
+}
+
+void __trace_stack(struct trace_array *tr,
+ unsigned long flags,
+ int skip, int pc)
+{
+ __ftrace_trace_stack(tr, flags, skip, pc);
+}
+
+static void ftrace_trace_userstack(struct trace_array *tr,
+ unsigned long flags, int pc)
{
#ifdef CONFIG_STACKTRACE
struct ring_buffer_event *event;
- struct stack_entry *entry;
+ struct userstack_entry *entry;
struct stack_trace trace;
- unsigned long irq_flags;
- if (!(trace_flags & TRACE_ITER_STACKTRACE))
+ if (!(trace_flags & TRACE_ITER_USERSTACKTRACE))
return;
- event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
- &irq_flags);
+ event = trace_buffer_lock_reserve(tr, TRACE_USER_STACK,
+ sizeof(*entry), flags, pc);
if (!event)
return;
entry = ring_buffer_event_data(event);
- tracing_generic_entry_update(&entry->ent, flags, pc);
- entry->ent.type = TRACE_STACK;
memset(&entry->caller, 0, sizeof(entry->caller));
trace.nr_entries = 0;
trace.max_entries = FTRACE_STACK_ENTRIES;
- trace.skip = skip;
+ trace.skip = 0;
trace.entries = entry->caller;
- save_stack_trace(&trace);
- ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+ save_stack_trace_user(&trace);
+ ring_buffer_unlock_commit(tr->buffer, event);
#endif
}
-void __trace_stack(struct trace_array *tr,
- struct trace_array_cpu *data,
- unsigned long flags,
- int skip)
+void __trace_userstack(struct trace_array *tr, unsigned long flags)
{
- ftrace_trace_stack(tr, data, flags, skip, preempt_count());
+ ftrace_trace_userstack(tr, flags, preempt_count());
}
static void
-ftrace_trace_special(void *__tr, void *__data,
+ftrace_trace_special(void *__tr,
unsigned long arg1, unsigned long arg2, unsigned long arg3,
int pc)
{
struct ring_buffer_event *event;
- struct trace_array_cpu *data = __data;
struct trace_array *tr = __tr;
struct special_entry *entry;
- unsigned long irq_flags;
- event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
- &irq_flags);
+ event = trace_buffer_lock_reserve(tr, TRACE_SPECIAL,
+ sizeof(*entry), 0, pc);
if (!event)
return;
entry = ring_buffer_event_data(event);
- tracing_generic_entry_update(&entry->ent, 0, pc);
- entry->ent.type = TRACE_SPECIAL;
entry->arg1 = arg1;
entry->arg2 = arg2;
entry->arg3 = arg3;
- ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
- ftrace_trace_stack(tr, data, irq_flags, 4, pc);
-
- trace_wake_up();
+ trace_buffer_unlock_commit(tr, event, 0, pc);
}
void
__trace_special(void *__tr, void *__data,
unsigned long arg1, unsigned long arg2, unsigned long arg3)
{
- ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count());
+ ftrace_trace_special(__tr, arg1, arg2, arg3, preempt_count());
}
void
tracing_sched_switch_trace(struct trace_array *tr,
- struct trace_array_cpu *data,
struct task_struct *prev,
struct task_struct *next,
unsigned long flags, int pc)
{
struct ring_buffer_event *event;
struct ctx_switch_entry *entry;
- unsigned long irq_flags;
- event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
- &irq_flags);
+ event = trace_buffer_lock_reserve(tr, TRACE_CTX,
+ sizeof(*entry), flags, pc);
if (!event)
return;
entry = ring_buffer_event_data(event);
- tracing_generic_entry_update(&entry->ent, flags, pc);
- entry->ent.type = TRACE_CTX;
entry->prev_pid = prev->pid;
entry->prev_prio = prev->prio;
entry->prev_state = prev->state;
entry->next_prio = next->prio;
entry->next_state = next->state;
entry->next_cpu = task_cpu(next);
- ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
- ftrace_trace_stack(tr, data, flags, 5, pc);
+ trace_buffer_unlock_commit(tr, event, flags, pc);
}
void
tracing_sched_wakeup_trace(struct trace_array *tr,
- struct trace_array_cpu *data,
struct task_struct *wakee,
struct task_struct *curr,
unsigned long flags, int pc)
{
struct ring_buffer_event *event;
struct ctx_switch_entry *entry;
- unsigned long irq_flags;
- event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
- &irq_flags);
+ event = trace_buffer_lock_reserve(tr, TRACE_WAKE,
+ sizeof(*entry), flags, pc);
if (!event)
return;
entry = ring_buffer_event_data(event);
- tracing_generic_entry_update(&entry->ent, flags, pc);
- entry->ent.type = TRACE_WAKE;
entry->prev_pid = curr->pid;
entry->prev_prio = curr->prio;
entry->prev_state = curr->state;
entry->next_prio = wakee->prio;
entry->next_state = wakee->state;
entry->next_cpu = task_cpu(wakee);
- ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
- ftrace_trace_stack(tr, data, flags, 6, pc);
-
- trace_wake_up();
+ trace_buffer_unlock_commit(tr, event, flags, pc);
}
void
{
struct trace_array *tr = &global_trace;
struct trace_array_cpu *data;
+ unsigned long flags;
int cpu;
int pc;
- if (tracing_disabled || !tr->ctrl)
+ if (tracing_disabled)
return;
pc = preempt_count();
- preempt_disable_notrace();
+ local_irq_save(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
- if (likely(!atomic_read(&data->disabled)))
- ftrace_trace_special(tr, data, arg1, arg2, arg3, pc);
+ if (likely(atomic_inc_return(&data->disabled) == 1))
+ ftrace_trace_special(tr, arg1, arg2, arg3, pc);
- preempt_enable_notrace();
+ atomic_dec(&data->disabled);
+ local_irq_restore(flags);
}
-#ifdef CONFIG_FUNCTION_TRACER
-static void
-function_trace_call(unsigned long ip, unsigned long parent_ip)
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+int trace_graph_entry(struct ftrace_graph_ent *trace)
{
struct trace_array *tr = &global_trace;
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
- int cpu, resched;
+ int cpu;
int pc;
- if (unlikely(!ftrace_function_enabled))
- return;
+ if (!ftrace_trace_task(current))
+ return 0;
- pc = preempt_count();
- resched = need_resched();
- preempt_disable_notrace();
- local_save_flags(flags);
+ if (!ftrace_graph_addr(trace->func))
+ return 0;
+
+ local_irq_save(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
-
- if (likely(disabled == 1))
- trace_function(tr, data, ip, parent_ip, flags, pc);
-
+ if (likely(disabled == 1)) {
+ pc = preempt_count();
+ __trace_graph_entry(tr, trace, flags, pc);
+ }
+ /* Only do the atomic if it is not already set */
+ if (!test_tsk_trace_graph(current))
+ set_tsk_trace_graph(current);
atomic_dec(&data->disabled);
- if (resched)
- preempt_enable_no_resched_notrace();
- else
- preempt_enable_notrace();
-}
+ local_irq_restore(flags);
-static struct ftrace_ops trace_ops __read_mostly =
-{
- .func = function_trace_call,
-};
-
-void tracing_start_function_trace(void)
-{
- ftrace_function_enabled = 0;
- register_ftrace_function(&trace_ops);
- if (tracer_enabled)
- ftrace_function_enabled = 1;
+ return 1;
}
-void tracing_stop_function_trace(void)
+void trace_graph_return(struct ftrace_graph_ret *trace)
{
- ftrace_function_enabled = 0;
- unregister_ftrace_function(&trace_ops);
+ struct trace_array *tr = &global_trace;
+ struct trace_array_cpu *data;
+ unsigned long flags;
+ long disabled;
+ int cpu;
+ int pc;
+
+ local_irq_save(flags);
+ cpu = raw_smp_processor_id();
+ data = tr->data[cpu];
+ disabled = atomic_inc_return(&data->disabled);
+ if (likely(disabled == 1)) {
+ pc = preempt_count();
+ __trace_graph_return(tr, trace, flags, pc);
+ }
+ if (!trace->depth)
+ clear_tsk_trace_graph(current);
+ atomic_dec(&data->disabled);
+ local_irq_restore(flags);
}
-#endif
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
enum trace_file_type {
TRACE_FILE_LAT_FMT = 1,
+ TRACE_FILE_ANNOTATE = 2,
};
-static void trace_iterator_increment(struct trace_iterator *iter, int cpu)
+static void trace_iterator_increment(struct trace_iterator *iter)
{
/* Don't allow ftrace to trace into the ring buffers */
ftrace_disable_cpu();
}
/* Find the next real entry, without updating the iterator itself */
-static struct trace_entry *
-find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts)
+struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
+ int *ent_cpu, u64 *ent_ts)
{
return __find_next_entry(iter, ent_cpu, ent_ts);
}
iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts);
if (iter->ent)
- trace_iterator_increment(iter, iter->cpu);
+ trace_iterator_increment(iter);
return iter->ent ? iter : NULL;
}
atomic_inc(&trace_record_cmdline_disabled);
- /* let the tracer grab locks here if needed */
- if (current_trace->start)
- current_trace->start(iter);
-
if (*pos != iter->pos) {
iter->ent = NULL;
iter->cpu = 0;
static void s_stop(struct seq_file *m, void *p)
{
- struct trace_iterator *iter = m->private;
-
atomic_dec(&trace_record_cmdline_disabled);
-
- /* let the tracer release locks here if needed */
- if (current_trace && current_trace == iter->trace && iter->trace->stop)
- iter->trace->stop(iter);
-
mutex_unlock(&trace_types_lock);
}
-#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
-
-static 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;
-}
-
static void print_lat_help_header(struct seq_file *m)
{
seq_puts(m, "# _------=> CPU# \n");
seq_puts(m, "\n");
}
-static void
-lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
+static void test_cpu_buff_start(struct trace_iterator *iter)
{
- int hardirq, softirq;
- char *comm;
-
- comm = trace_find_cmdline(entry->pid);
-
- trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid);
- trace_seq_printf(s, "%3d", cpu);
- trace_seq_printf(s, "%c%c",
- (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
- (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.',
- ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.'));
-
- hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
- softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
- if (hardirq && softirq) {
- trace_seq_putc(s, 'H');
- } else {
- if (hardirq) {
- trace_seq_putc(s, 'h');
- } else {
- if (softirq)
- trace_seq_putc(s, 's');
- else
- trace_seq_putc(s, '.');
- }
- }
-
- if (entry->preempt_count)
- trace_seq_printf(s, "%x", entry->preempt_count);
- else
- trace_seq_puts(s, ".");
-}
-
-unsigned long preempt_mark_thresh = 100;
-
-static void
-lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
- unsigned long rel_usecs)
-{
- trace_seq_printf(s, " %4lldus", abs_usecs);
- if (rel_usecs > preempt_mark_thresh)
- trace_seq_puts(s, "!: ");
- else if (rel_usecs > 1)
- trace_seq_puts(s, "+: ");
- else
- trace_seq_puts(s, " : ");
-}
-
-static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
-
-/*
- * The message is supposed to contain an ending newline.
- * If the printing stops prematurely, try to add a newline of our own.
- */
-void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
-{
- struct trace_entry *ent;
- struct trace_field_cont *cont;
- bool ok = true;
+ struct trace_seq *s = &iter->seq;
- ent = peek_next_entry(iter, iter->cpu, NULL);
- if (!ent || ent->type != TRACE_CONT) {
- trace_seq_putc(s, '\n');
+ if (!(trace_flags & TRACE_ITER_ANNOTATE))
return;
- }
- do {
- cont = (struct trace_field_cont *)ent;
- if (ok)
- ok = (trace_seq_printf(s, "%s", cont->buf) > 0);
-
- ftrace_disable_cpu();
-
- if (iter->buffer_iter[iter->cpu])
- ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
- else
- ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL);
-
- ftrace_enable_cpu();
+ if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
+ return;
- ent = peek_next_entry(iter, iter->cpu, NULL);
- } while (ent && ent->type == TRACE_CONT);
+ if (cpumask_test_cpu(iter->cpu, iter->started))
+ return;
- if (!ok)
- trace_seq_putc(s, '\n');
+ cpumask_set_cpu(iter->cpu, iter->started);
+ trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu);
}
-static enum print_line_t
-print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
+static enum print_line_t print_lat_fmt(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
- struct trace_entry *next_entry;
- unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
+ struct trace_event *event;
struct trace_entry *entry = iter->ent;
- unsigned long abs_usecs;
- unsigned long rel_usecs;
- u64 next_ts;
- char *comm;
- int S, T;
- int i;
- unsigned state;
-
- if (entry->type == TRACE_CONT)
- return TRACE_TYPE_HANDLED;
-
- next_entry = find_next_entry(iter, NULL, &next_ts);
- if (!next_entry)
- next_ts = iter->ts;
- rel_usecs = ns2usecs(next_ts - iter->ts);
- abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
-
- if (verbose) {
- comm = trace_find_cmdline(entry->pid);
- trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]"
- " %ld.%03ldms (+%ld.%03ldms): ",
- comm,
- entry->pid, cpu, entry->flags,
- entry->preempt_count, trace_idx,
- ns2usecs(iter->ts),
- abs_usecs/1000,
- abs_usecs % 1000, rel_usecs/1000,
- rel_usecs % 1000);
- } else {
- lat_print_generic(s, entry, cpu);
- lat_print_timestamp(s, abs_usecs, rel_usecs);
- }
- switch (entry->type) {
- case TRACE_FN: {
- struct ftrace_entry *field;
- trace_assign_type(field, entry);
+ test_cpu_buff_start(iter);
- seq_print_ip_sym(s, field->ip, sym_flags);
- trace_seq_puts(s, " (");
- seq_print_ip_sym(s, field->parent_ip, sym_flags);
- trace_seq_puts(s, ")\n");
- break;
- }
- case TRACE_CTX:
- case TRACE_WAKE: {
- struct ctx_switch_entry *field;
-
- trace_assign_type(field, entry);
-
- T = field->next_state < sizeof(state_to_char) ?
- state_to_char[field->next_state] : 'X';
-
- state = field->prev_state ?
- __ffs(field->prev_state) + 1 : 0;
- S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X';
- comm = trace_find_cmdline(field->next_pid);
- trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
- field->prev_pid,
- field->prev_prio,
- S, entry->type == TRACE_CTX ? "==>" : " +",
- field->next_cpu,
- field->next_pid,
- field->next_prio,
- T, comm);
- break;
- }
- case TRACE_SPECIAL: {
- struct special_entry *field;
-
- trace_assign_type(field, entry);
+ event = ftrace_find_event(entry->type);
- trace_seq_printf(s, "# %ld %ld %ld\n",
- field->arg1,
- field->arg2,
- field->arg3);
- break;
+ if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+ if (!trace_print_lat_context(iter))
+ goto partial;
}
- case TRACE_STACK: {
- struct stack_entry *field;
- trace_assign_type(field, entry);
+ if (event)
+ return event->latency_trace(iter, sym_flags);
- for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
- if (i)
- trace_seq_puts(s, " <= ");
- seq_print_ip_sym(s, field->caller[i], sym_flags);
- }
- trace_seq_puts(s, "\n");
- break;
- }
- case TRACE_PRINT: {
- struct print_entry *field;
-
- trace_assign_type(field, entry);
+ if (!trace_seq_printf(s, "Unknown type %d\n", entry->type))
+ goto partial;
- seq_print_ip_sym(s, field->ip, sym_flags);
- trace_seq_printf(s, ": %s", field->buf);
- if (entry->flags & TRACE_FLAG_CONT)
- trace_seq_print_cont(s, iter);
- break;
- }
- default:
- trace_seq_printf(s, "Unknown type %d\n", entry->type);
- }
return TRACE_TYPE_HANDLED;
+partial:
+ return TRACE_TYPE_PARTIAL_LINE;
}
static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
struct trace_seq *s = &iter->seq;
unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
struct trace_entry *entry;
- unsigned long usec_rem;
- unsigned long long t;
- unsigned long secs;
- char *comm;
- int ret;
- int S, T;
- int i;
+ struct trace_event *event;
entry = iter->ent;
- if (entry->type == TRACE_CONT)
- return TRACE_TYPE_HANDLED;
-
- comm = trace_find_cmdline(iter->ent->pid);
-
- t = ns2usecs(iter->ts);
- usec_rem = do_div(t, 1000000ULL);
- secs = (unsigned long)t;
-
- ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- ret = trace_seq_printf(s, "[%03d] ", iter->cpu);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- switch (entry->type) {
- case TRACE_FN: {
- struct ftrace_entry *field;
-
- trace_assign_type(field, entry);
-
- ret = seq_print_ip_sym(s, field->ip, sym_flags);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- if ((sym_flags & TRACE_ITER_PRINT_PARENT) &&
- field->parent_ip) {
- ret = trace_seq_printf(s, " <-");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- ret = seq_print_ip_sym(s,
- field->parent_ip,
- sym_flags);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
- ret = trace_seq_printf(s, "\n");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- case TRACE_CTX:
- case TRACE_WAKE: {
- struct ctx_switch_entry *field;
-
- trace_assign_type(field, entry);
-
- S = field->prev_state < sizeof(state_to_char) ?
- state_to_char[field->prev_state] : 'X';
- T = field->next_state < sizeof(state_to_char) ?
- state_to_char[field->next_state] : 'X';
- ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n",
- field->prev_pid,
- field->prev_prio,
- S,
- entry->type == TRACE_CTX ? "==>" : " +",
- field->next_cpu,
- field->next_pid,
- field->next_prio,
- T);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- case TRACE_SPECIAL: {
- struct special_entry *field;
+ test_cpu_buff_start(iter);
- trace_assign_type(field, entry);
+ event = ftrace_find_event(entry->type);
- ret = trace_seq_printf(s, "# %ld %ld %ld\n",
- field->arg1,
- field->arg2,
- field->arg3);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
+ if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+ if (!trace_print_context(iter))
+ goto partial;
}
- case TRACE_STACK: {
- struct stack_entry *field;
- trace_assign_type(field, entry);
-
- for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
- if (i) {
- ret = trace_seq_puts(s, " <= ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
- ret = seq_print_ip_sym(s, field->caller[i],
- sym_flags);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
- ret = trace_seq_puts(s, "\n");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- case TRACE_PRINT: {
- struct print_entry *field;
+ if (event)
+ return event->trace(iter, sym_flags);
- trace_assign_type(field, entry);
+ if (!trace_seq_printf(s, "Unknown type %d\n", entry->type))
+ goto partial;
- seq_print_ip_sym(s, field->ip, sym_flags);
- trace_seq_printf(s, ": %s", field->buf);
- if (entry->flags & TRACE_FLAG_CONT)
- trace_seq_print_cont(s, iter);
- break;
- }
- }
return TRACE_TYPE_HANDLED;
+partial:
+ return TRACE_TYPE_PARTIAL_LINE;
}
static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
struct trace_entry *entry;
- int ret;
- int S, T;
+ struct trace_event *event;
entry = iter->ent;
- if (entry->type == TRACE_CONT)
- return TRACE_TYPE_HANDLED;
-
- ret = trace_seq_printf(s, "%d %d %llu ",
- entry->pid, iter->cpu, iter->ts);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- switch (entry->type) {
- case TRACE_FN: {
- struct ftrace_entry *field;
-
- trace_assign_type(field, entry);
-
- ret = trace_seq_printf(s, "%x %x\n",
- field->ip,
- field->parent_ip);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- case TRACE_CTX:
- case TRACE_WAKE: {
- struct ctx_switch_entry *field;
-
- trace_assign_type(field, entry);
-
- S = field->prev_state < sizeof(state_to_char) ?
- state_to_char[field->prev_state] : 'X';
- T = field->next_state < sizeof(state_to_char) ?
- state_to_char[field->next_state] : 'X';
- if (entry->type == TRACE_WAKE)
- S = '+';
- ret = trace_seq_printf(s, "%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);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
+ if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+ if (!trace_seq_printf(s, "%d %d %llu ",
+ entry->pid, iter->cpu, iter->ts))
+ goto partial;
}
- case TRACE_SPECIAL:
- case TRACE_STACK: {
- struct special_entry *field;
- trace_assign_type(field, entry);
+ event = ftrace_find_event(entry->type);
+ if (event)
+ return event->raw(iter, 0);
- ret = trace_seq_printf(s, "# %ld %ld %ld\n",
- field->arg1,
- field->arg2,
- field->arg3);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- case TRACE_PRINT: {
- struct print_entry *field;
+ if (!trace_seq_printf(s, "%d ?\n", entry->type))
+ goto partial;
- trace_assign_type(field, entry);
-
- trace_seq_printf(s, "# %lx %s", field->ip, field->buf);
- if (entry->flags & TRACE_FLAG_CONT)
- trace_seq_print_cont(s, iter);
- break;
- }
- }
return TRACE_TYPE_HANDLED;
+partial:
+ return TRACE_TYPE_PARTIAL_LINE;
}
-#define SEQ_PUT_FIELD_RET(s, x) \
-do { \
- if (!trace_seq_putmem(s, &(x), sizeof(x))) \
- return 0; \
-} while (0)
-
-#define SEQ_PUT_HEX_FIELD_RET(s, x) \
-do { \
- BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \
- if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \
- return 0; \
-} while (0)
-
static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
unsigned char newline = '\n';
struct trace_entry *entry;
- int S, T;
+ struct trace_event *event;
entry = iter->ent;
- if (entry->type == TRACE_CONT)
- return TRACE_TYPE_HANDLED;
+ 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_RET(s, entry->pid);
- SEQ_PUT_HEX_FIELD_RET(s, iter->cpu);
- SEQ_PUT_HEX_FIELD_RET(s, iter->ts);
+ event = ftrace_find_event(entry->type);
+ if (event) {
+ enum print_line_t ret = event->hex(iter, 0);
+ if (ret != TRACE_TYPE_HANDLED)
+ return ret;
+ }
- switch (entry->type) {
- case TRACE_FN: {
- struct ftrace_entry *field;
+ SEQ_PUT_FIELD_RET(s, newline);
- trace_assign_type(field, entry);
+ return TRACE_TYPE_HANDLED;
+}
- SEQ_PUT_HEX_FIELD_RET(s, field->ip);
- SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
- break;
- }
- case TRACE_CTX:
- case TRACE_WAKE: {
- struct ctx_switch_entry *field;
-
- trace_assign_type(field, entry);
-
- S = field->prev_state < sizeof(state_to_char) ?
- state_to_char[field->prev_state] : 'X';
- T = field->next_state < sizeof(state_to_char) ?
- state_to_char[field->next_state] : 'X';
- if (entry->type == TRACE_WAKE)
- S = '+';
- 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);
- break;
- }
- case TRACE_SPECIAL:
- case TRACE_STACK: {
- struct special_entry *field;
+static enum print_line_t 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);
+ trace_assign_type(field, entry);
- SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
- SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
- SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
- break;
- }
- }
- SEQ_PUT_FIELD_RET(s, newline);
+ ret = trace_seq_printf(s, "%s", field->buf);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
{
struct trace_seq *s = &iter->seq;
struct trace_entry *entry;
+ struct trace_event *event;
entry = iter->ent;
- if (entry->type == TRACE_CONT)
- return TRACE_TYPE_HANDLED;
-
- SEQ_PUT_FIELD_RET(s, entry->pid);
- SEQ_PUT_FIELD_RET(s, entry->cpu);
- SEQ_PUT_FIELD_RET(s, iter->ts);
-
- switch (entry->type) {
- case TRACE_FN: {
- struct ftrace_entry *field;
-
- trace_assign_type(field, entry);
-
- SEQ_PUT_FIELD_RET(s, field->ip);
- SEQ_PUT_FIELD_RET(s, field->parent_ip);
- break;
- }
- case TRACE_CTX: {
- struct ctx_switch_entry *field;
-
- trace_assign_type(field, entry);
-
- 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);
- break;
+ 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);
}
- case TRACE_SPECIAL:
- case TRACE_STACK: {
- struct special_entry *field;
- trace_assign_type(field, entry);
-
- SEQ_PUT_FIELD_RET(s, field->arg1);
- SEQ_PUT_FIELD_RET(s, field->arg2);
- SEQ_PUT_FIELD_RET(s, field->arg3);
- break;
- }
- }
- return 1;
+ event = ftrace_find_event(entry->type);
+ return event ? event->binary(iter, 0) : TRACE_TYPE_HANDLED;
}
static int trace_empty(struct trace_iterator *iter)
return ret;
}
+ if (iter->ent->type == TRACE_PRINT &&
+ trace_flags & TRACE_ITER_PRINTK &&
+ trace_flags & TRACE_ITER_PRINTK_MSGONLY)
+ return print_printk_msg_only(iter);
+
if (trace_flags & TRACE_ITER_BIN)
return print_bin_fmt(iter);
return print_raw_fmt(iter);
if (iter->iter_flags & TRACE_FILE_LAT_FMT)
- return print_lat_fmt(iter, iter->idx, iter->cpu);
+ return print_lat_fmt(iter);
return print_trace_fmt(iter);
}
seq_printf(m, "# tracer: %s\n", iter->trace->name);
seq_puts(m, "#\n");
}
- if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
+ if (iter->trace && iter->trace->print_header)
+ iter->trace->print_header(m);
+ else if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
/* print nothing if the buffers are empty */
if (trace_empty(iter))
return 0;
iter->trace = current_trace;
iter->pos = -1;
+ /* Notify the tracer early; before we stop tracing. */
+ if (iter->trace && iter->trace->open)
+ iter->trace->open(iter);
+
+ /* Annotate start of buffers if we had overruns */
+ if (ring_buffer_overruns(iter->tr->buffer))
+ iter->iter_flags |= TRACE_FILE_ANNOTATE;
+
+
for_each_tracing_cpu(cpu) {
iter->buffer_iter[cpu] =
m->private = iter;
/* stop the trace while dumping */
- if (iter->tr->ctrl) {
- tracer_enabled = 0;
- ftrace_function_enabled = 0;
- }
-
- if (iter->trace && iter->trace->open)
- iter->trace->open(iter);
+ tracing_stop();
mutex_unlock(&trace_types_lock);
iter->trace->close(iter);
/* reenable tracing if it was previously enabled */
- if (iter->tr->ctrl) {
- tracer_enabled = 1;
- /*
- * It is safe to enable function tracing even if it
- * isn't used
- */
- ftrace_function_enabled = 1;
- }
+ tracing_start();
mutex_unlock(&trace_types_lock);
seq_release(inode, file);
/*
* Only trace on a CPU if the bitmask is set:
*/
-static cpumask_t tracing_cpumask = CPU_MASK_ALL;
-
-/*
- * When tracing/tracing_cpu_mask is modified then this holds
- * the new bitmask we are about to install:
- */
-static cpumask_t tracing_cpumask_new;
+static cpumask_var_t tracing_cpumask;
/*
* The tracer itself will not take this lock, but still we want
size_t count, loff_t *ppos)
{
int err, cpu;
+ cpumask_var_t tracing_cpumask_new;
+
+ if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL))
+ return -ENOMEM;
mutex_lock(&tracing_cpumask_update_lock);
err = cpumask_parse_user(ubuf, count, tracing_cpumask_new);
if (err)
goto err_unlock;
- raw_local_irq_disable();
+ local_irq_disable();
__raw_spin_lock(&ftrace_max_lock);
for_each_tracing_cpu(cpu) {
/*
* Increase/decrease the disabled counter if we are
* about to flip a bit in the cpumask:
*/
- if (cpu_isset(cpu, tracing_cpumask) &&
- !cpu_isset(cpu, tracing_cpumask_new)) {
+ if (cpumask_test_cpu(cpu, tracing_cpumask) &&
+ !cpumask_test_cpu(cpu, tracing_cpumask_new)) {
atomic_inc(&global_trace.data[cpu]->disabled);
}
- if (!cpu_isset(cpu, tracing_cpumask) &&
- cpu_isset(cpu, tracing_cpumask_new)) {
+ if (!cpumask_test_cpu(cpu, tracing_cpumask) &&
+ cpumask_test_cpu(cpu, tracing_cpumask_new)) {
atomic_dec(&global_trace.data[cpu]->disabled);
}
}
__raw_spin_unlock(&ftrace_max_lock);
- raw_local_irq_enable();
+ local_irq_enable();
- tracing_cpumask = tracing_cpumask_new;
+ cpumask_copy(tracing_cpumask, tracing_cpumask_new);
mutex_unlock(&tracing_cpumask_update_lock);
+ free_cpumask_var(tracing_cpumask_new);
return count;
err_unlock:
mutex_unlock(&tracing_cpumask_update_lock);
+ free_cpumask_var(tracing_cpumask);
return err;
}
};
static ssize_t
-tracing_iter_ctrl_read(struct file *filp, char __user *ubuf,
+tracing_trace_options_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
+ int i;
char *buf;
int r = 0;
int len = 0;
- int i;
+ u32 tracer_flags = current_trace->flags->val;
+ struct tracer_opt *trace_opts = current_trace->flags->opts;
- /* calulate max size */
+
+ /* calculate max size */
for (i = 0; trace_options[i]; i++) {
len += strlen(trace_options[i]);
len += 3; /* "no" and space */
}
+ /*
+ * Increase the size with names of options specific
+ * of the current tracer.
+ */
+ for (i = 0; trace_opts[i].name; i++) {
+ len += strlen(trace_opts[i].name);
+ len += 3; /* "no" and space */
+ }
+
/* +2 for \n and \0 */
buf = kmalloc(len + 2, GFP_KERNEL);
if (!buf)
r += sprintf(buf + r, "no%s ", trace_options[i]);
}
- r += sprintf(buf + r, "\n");
- WARN_ON(r >= len + 2);
+ for (i = 0; trace_opts[i].name; i++) {
+ if (tracer_flags & trace_opts[i].bit)
+ r += sprintf(buf + r, "%s ",
+ trace_opts[i].name);
+ else
+ r += sprintf(buf + r, "no%s ",
+ trace_opts[i].name);
+ }
+
+ r += sprintf(buf + r, "\n");
+ WARN_ON(r >= len + 2);
+
+ r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+
+ kfree(buf);
+
+ return r;
+}
+
+/* Try to assign a tracer specific option */
+static int set_tracer_option(struct tracer *trace, char *cmp, int neg)
+{
+ struct tracer_flags *trace_flags = trace->flags;
+ struct tracer_opt *opts = NULL;
+ int ret = 0, i = 0;
+ int len;
+
+ for (i = 0; trace_flags->opts[i].name; i++) {
+ opts = &trace_flags->opts[i];
+ len = strlen(opts->name);
- r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+ if (strncmp(cmp, opts->name, len) == 0) {
+ ret = trace->set_flag(trace_flags->val,
+ opts->bit, !neg);
+ break;
+ }
+ }
+ /* Not found */
+ if (!trace_flags->opts[i].name)
+ return -EINVAL;
- kfree(buf);
+ /* Refused to handle */
+ if (ret)
+ return ret;
- return r;
+ if (neg)
+ trace_flags->val &= ~opts->bit;
+ else
+ trace_flags->val |= opts->bit;
+
+ return 0;
}
static ssize_t
-tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf,
+tracing_trace_options_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
char buf[64];
char *cmp = buf;
int neg = 0;
+ int ret;
int i;
if (cnt >= sizeof(buf))
break;
}
}
- /*
- * If no option could be set, return an error:
- */
- if (!trace_options[i])
- return -EINVAL;
+
+ /* If no option could be set, test the specific tracer options */
+ if (!trace_options[i]) {
+ ret = set_tracer_option(current_trace, cmp, neg);
+ if (ret)
+ return ret;
+ }
filp->f_pos += cnt;
static struct file_operations tracing_iter_fops = {
.open = tracing_open_generic,
- .read = tracing_iter_ctrl_read,
- .write = tracing_iter_ctrl_write,
+ .read = tracing_trace_options_read,
+ .write = tracing_trace_options_write,
};
static const char readme_msg[] =
"# echo sched_switch > /debug/tracing/current_tracer\n"
"# cat /debug/tracing/current_tracer\n"
"sched_switch\n"
- "# cat /debug/tracing/iter_ctrl\n"
+ "# cat /debug/tracing/trace_options\n"
"noprint-parent nosym-offset nosym-addr noverbose\n"
- "# echo print-parent > /debug/tracing/iter_ctrl\n"
+ "# echo print-parent > /debug/tracing/trace_options\n"
"# echo 1 > /debug/tracing/tracing_enabled\n"
"# cat /debug/tracing/trace > /tmp/trace.txt\n"
"echo 0 > /debug/tracing/tracing_enabled\n"
tracing_ctrl_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
- struct trace_array *tr = filp->private_data;
char buf[64];
int r;
- r = sprintf(buf, "%ld\n", tr->ctrl);
+ r = sprintf(buf, "%u\n", tracer_enabled);
return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}
val = !!val;
mutex_lock(&trace_types_lock);
- if (tr->ctrl ^ val) {
- if (val)
+ if (tracer_enabled ^ val) {
+ if (val) {
tracer_enabled = 1;
- else
+ if (current_trace->start)
+ current_trace->start(tr);
+ tracing_start();
+ } else {
tracer_enabled = 0;
-
- tr->ctrl = val;
-
- if (current_trace && current_trace->ctrl_update)
- current_trace->ctrl_update(tr);
+ tracing_stop();
+ if (current_trace->stop)
+ current_trace->stop(tr);
+ }
}
mutex_unlock(&trace_types_lock);
return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}
-static ssize_t
-tracing_set_trace_write(struct file *filp, const char __user *ubuf,
- size_t cnt, loff_t *ppos)
+int tracer_init(struct tracer *t, struct trace_array *tr)
+{
+ tracing_reset_online_cpus(tr);
+ return t->init(tr);
+}
+
+static int tracing_set_tracer(const char *buf)
{
struct trace_array *tr = &global_trace;
struct tracer *t;
- char buf[max_tracer_type_len+1];
- int i;
- size_t ret;
-
- ret = cnt;
-
- if (cnt > max_tracer_type_len)
- cnt = max_tracer_type_len;
-
- if (copy_from_user(&buf, ubuf, cnt))
- return -EFAULT;
-
- buf[cnt] = 0;
-
- /* strip ending whitespace. */
- for (i = cnt - 1; i > 0 && isspace(buf[i]); i--)
- buf[i] = 0;
+ int ret = 0;
mutex_lock(&trace_types_lock);
for (t = trace_types; t; t = t->next) {
if (t == current_trace)
goto out;
+ trace_branch_disable();
if (current_trace && current_trace->reset)
current_trace->reset(tr);
current_trace = t;
- if (t->init)
- t->init(tr);
+ if (t->init) {
+ ret = tracer_init(t, tr);
+ if (ret)
+ goto out;
+ }
+ trace_branch_enable(tr);
out:
mutex_unlock(&trace_types_lock);
- if (ret > 0)
- filp->f_pos += ret;
+ return ret;
+}
+
+static ssize_t
+tracing_set_trace_write(struct file *filp, const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ char buf[max_tracer_type_len+1];
+ int i;
+ size_t ret;
+ int err;
+
+ ret = cnt;
+
+ if (cnt > max_tracer_type_len)
+ cnt = max_tracer_type_len;
+
+ if (copy_from_user(&buf, ubuf, cnt))
+ return -EFAULT;
+
+ buf[cnt] = 0;
+
+ /* strip ending whitespace. */
+ for (i = cnt - 1; i > 0 && isspace(buf[i]); i--)
+ buf[i] = 0;
+
+ err = tracing_set_tracer(buf);
+ if (err)
+ return err;
+
+ filp->f_pos += ret;
return ret;
}
if (!iter)
return -ENOMEM;
+ if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) {
+ kfree(iter);
+ return -ENOMEM;
+ }
+
mutex_lock(&trace_types_lock);
+
+ /* trace pipe does not show start of buffer */
+ cpumask_setall(iter->started);
+
iter->tr = &global_trace;
iter->trace = current_trace;
filp->private_data = iter;
{
struct trace_iterator *iter = file->private_data;
+ free_cpumask_var(iter->started);
kfree(iter);
atomic_dec(&tracing_reader);
}
}
-/*
- * Consumer reader.
- */
-static ssize_t
-tracing_read_pipe(struct file *filp, char __user *ubuf,
- size_t cnt, loff_t *ppos)
+/* Must be called with trace_types_lock mutex held. */
+static int tracing_wait_pipe(struct file *filp)
{
struct trace_iterator *iter = filp->private_data;
- ssize_t sret;
-
- /* return any leftover data */
- sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
- if (sret != -EBUSY)
- return sret;
-
- trace_seq_reset(&iter->seq);
-
- mutex_lock(&trace_types_lock);
- if (iter->trace->read) {
- sret = iter->trace->read(iter, filp, ubuf, cnt, ppos);
- if (sret)
- goto out;
- }
-waitagain:
- sret = 0;
while (trace_empty(iter)) {
if ((filp->f_flags & O_NONBLOCK)) {
- sret = -EAGAIN;
- goto out;
+ return -EAGAIN;
}
/*
iter->tr->waiter = NULL;
if (signal_pending(current)) {
- sret = -EINTR;
- goto out;
+ return -EINTR;
}
if (iter->trace != current_trace)
- goto out;
+ return 0;
/*
* We block until we read something and tracing is disabled.
continue;
}
+ return 1;
+}
+
+/*
+ * Consumer reader.
+ */
+static ssize_t
+tracing_read_pipe(struct file *filp, char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ struct trace_iterator *iter = filp->private_data;
+ ssize_t sret;
+
+ /* return any leftover data */
+ sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
+ if (sret != -EBUSY)
+ return sret;
+
+ trace_seq_reset(&iter->seq);
+
+ mutex_lock(&trace_types_lock);
+ if (iter->trace->read) {
+ sret = iter->trace->read(iter, filp, ubuf, cnt, ppos);
+ if (sret)
+ goto out;
+ }
+
+waitagain:
+ sret = tracing_wait_pipe(filp);
+ if (sret <= 0)
+ goto out;
+
/* stop when tracing is finished */
- if (trace_empty(iter))
+ if (trace_empty(iter)) {
+ sret = 0;
goto out;
+ }
if (cnt >= PAGE_SIZE)
cnt = PAGE_SIZE - 1;
iter->seq.len = len;
break;
}
-
- trace_consume(iter);
+ if (ret != TRACE_TYPE_NO_CONSUME)
+ trace_consume(iter);
if (iter->seq.len >= cnt)
break;
return sret;
}
+static void tracing_pipe_buf_release(struct pipe_inode_info *pipe,
+ struct pipe_buffer *buf)
+{
+ __free_page(buf->page);
+}
+
+static void tracing_spd_release_pipe(struct splice_pipe_desc *spd,
+ unsigned int idx)
+{
+ __free_page(spd->pages[idx]);
+}
+
+static struct pipe_buf_operations tracing_pipe_buf_ops = {
+ .can_merge = 0,
+ .map = generic_pipe_buf_map,
+ .unmap = generic_pipe_buf_unmap,
+ .confirm = generic_pipe_buf_confirm,
+ .release = tracing_pipe_buf_release,
+ .steal = generic_pipe_buf_steal,
+ .get = generic_pipe_buf_get,
+};
+
+static size_t
+tracing_fill_pipe_page(struct page *pages, size_t rem,
+ struct trace_iterator *iter)
+{
+ size_t count;
+ int ret;
+
+ /* Seq buffer is page-sized, exactly what we need. */
+ for (;;) {
+ count = iter->seq.len;
+ ret = print_trace_line(iter);
+ count = iter->seq.len - count;
+ if (rem < count) {
+ rem = 0;
+ iter->seq.len -= count;
+ break;
+ }
+ if (ret == TRACE_TYPE_PARTIAL_LINE) {
+ iter->seq.len -= count;
+ break;
+ }
+
+ trace_consume(iter);
+ rem -= count;
+ if (!find_next_entry_inc(iter)) {
+ rem = 0;
+ iter->ent = NULL;
+ break;
+ }
+ }
+
+ return rem;
+}
+
+static ssize_t tracing_splice_read_pipe(struct file *filp,
+ loff_t *ppos,
+ struct pipe_inode_info *pipe,
+ size_t len,
+ unsigned int flags)
+{
+ struct page *pages[PIPE_BUFFERS];
+ struct partial_page partial[PIPE_BUFFERS];
+ struct trace_iterator *iter = filp->private_data;
+ struct splice_pipe_desc spd = {
+ .pages = pages,
+ .partial = partial,
+ .nr_pages = 0, /* This gets updated below. */
+ .flags = flags,
+ .ops = &tracing_pipe_buf_ops,
+ .spd_release = tracing_spd_release_pipe,
+ };
+ ssize_t ret;
+ size_t rem;
+ unsigned int i;
+
+ mutex_lock(&trace_types_lock);
+
+ if (iter->trace->splice_read) {
+ ret = iter->trace->splice_read(iter, filp,
+ ppos, pipe, len, flags);
+ if (ret)
+ goto out_err;
+ }
+
+ ret = tracing_wait_pipe(filp);
+ if (ret <= 0)
+ goto out_err;
+
+ if (!iter->ent && !find_next_entry_inc(iter)) {
+ ret = -EFAULT;
+ goto out_err;
+ }
+
+ /* Fill as many pages as possible. */
+ for (i = 0, rem = len; i < PIPE_BUFFERS && rem; i++) {
+ pages[i] = alloc_page(GFP_KERNEL);
+ if (!pages[i])
+ break;
+
+ rem = tracing_fill_pipe_page(pages[i], rem, iter);
+
+ /* Copy the data into the page, so we can start over. */
+ ret = trace_seq_to_buffer(&iter->seq,
+ page_address(pages[i]),
+ iter->seq.len);
+ if (ret < 0) {
+ __free_page(pages[i]);
+ break;
+ }
+ partial[i].offset = 0;
+ partial[i].len = iter->seq.len;
+
+ trace_seq_reset(&iter->seq);
+ }
+
+ mutex_unlock(&trace_types_lock);
+
+ spd.nr_pages = i;
+
+ return splice_to_pipe(pipe, &spd);
+
+out_err:
+ mutex_unlock(&trace_types_lock);
+
+ return ret;
+}
+
static ssize_t
tracing_entries_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
char buf[64];
int r;
- r = sprintf(buf, "%lu\n", tr->entries);
+ r = sprintf(buf, "%lu\n", tr->entries >> 10);
return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}
unsigned long val;
char buf[64];
int ret, cpu;
- struct trace_array *tr = filp->private_data;
if (cnt >= sizeof(buf))
return -EINVAL;
mutex_lock(&trace_types_lock);
- if (tr->ctrl) {
- cnt = -EBUSY;
- pr_info("ftrace: please disable tracing"
- " before modifying buffer size\n");
- goto out;
- }
+ tracing_stop();
/* disable all cpu buffers */
for_each_tracing_cpu(cpu) {
atomic_inc(&max_tr.data[cpu]->disabled);
}
+ /* value is in KB */
+ val <<= 10;
+
if (val != global_trace.entries) {
ret = ring_buffer_resize(global_trace.buffer, val);
if (ret < 0) {
atomic_dec(&max_tr.data[cpu]->disabled);
}
+ tracing_start();
max_tr.entries = global_trace.entries;
mutex_unlock(&trace_types_lock);
int ret;
va_list args;
va_start(args, fmt);
- ret = trace_vprintk(0, fmt, args);
+ ret = trace_vprintk(0, -1, fmt, args);
va_end(args);
return ret;
}
{
char *buf;
char *end;
- struct trace_array *tr = &global_trace;
- if (!tr->ctrl || tracing_disabled)
+ if (tracing_disabled)
return -EINVAL;
if (cnt > TRACE_BUF_SIZE)
.open = tracing_open_pipe,
.poll = tracing_poll_pipe,
.read = tracing_read_pipe,
+ .splice_read = tracing_splice_read_pipe,
.release = tracing_release_pipe,
};
#ifdef CONFIG_DYNAMIC_FTRACE
+int __weak ftrace_arch_read_dyn_info(char *buf, int size)
+{
+ return 0;
+}
+
static ssize_t
-tracing_read_long(struct file *filp, char __user *ubuf,
+tracing_read_dyn_info(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
+ static char ftrace_dyn_info_buffer[1024];
+ static DEFINE_MUTEX(dyn_info_mutex);
unsigned long *p = filp->private_data;
- char buf[64];
+ char *buf = ftrace_dyn_info_buffer;
+ int size = ARRAY_SIZE(ftrace_dyn_info_buffer);
int r;
- r = sprintf(buf, "%ld\n", *p);
+ mutex_lock(&dyn_info_mutex);
+ r = sprintf(buf, "%ld ", *p);
- return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+ r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r);
+ buf[r++] = '\n';
+
+ r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+
+ mutex_unlock(&dyn_info_mutex);
+
+ return r;
}
-static struct file_operations tracing_read_long_fops = {
+static struct file_operations tracing_dyn_info_fops = {
.open = tracing_open_generic,
- .read = tracing_read_long,
+ .read = tracing_read_dyn_info,
};
#endif
if (!entry)
pr_warning("Could not create debugfs 'tracing_enabled' entry\n");
- entry = debugfs_create_file("iter_ctrl", 0644, d_tracer,
+ entry = debugfs_create_file("trace_options", 0644, d_tracer,
NULL, &tracing_iter_fops);
if (!entry)
- pr_warning("Could not create debugfs 'iter_ctrl' entry\n");
+ pr_warning("Could not create debugfs 'trace_options' entry\n");
entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer,
NULL, &tracing_cpumask_fops);
pr_warning("Could not create debugfs "
"'trace_pipe' entry\n");
- entry = debugfs_create_file("trace_entries", 0644, d_tracer,
+ entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer,
&global_trace, &tracing_entries_fops);
if (!entry)
pr_warning("Could not create debugfs "
- "'trace_entries' entry\n");
+ "'buffer_size_kb' entry\n");
entry = debugfs_create_file("trace_marker", 0220, d_tracer,
NULL, &tracing_mark_fops);
#ifdef CONFIG_DYNAMIC_FTRACE
entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer,
&ftrace_update_tot_cnt,
- &tracing_read_long_fops);
+ &tracing_dyn_info_fops);
if (!entry)
pr_warning("Could not create debugfs "
"'dyn_ftrace_total_info' entry\n");
return 0;
}
-int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
+int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args)
{
static DEFINE_SPINLOCK(trace_buf_lock);
static char trace_buf[TRACE_BUF_SIZE];
struct ring_buffer_event *event;
struct trace_array *tr = &global_trace;
struct trace_array_cpu *data;
- struct print_entry *entry;
- unsigned long flags, irq_flags;
int cpu, len = 0, size, pc;
+ struct print_entry *entry;
+ unsigned long irq_flags;
- if (!tr->ctrl || tracing_disabled)
+ if (tracing_disabled || tracing_selftest_running)
return 0;
pc = preempt_count();
if (unlikely(atomic_read(&data->disabled)))
goto out;
- spin_lock_irqsave(&trace_buf_lock, flags);
+ pause_graph_tracing();
+ spin_lock_irqsave(&trace_buf_lock, irq_flags);
len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
len = min(len, TRACE_BUF_SIZE-1);
trace_buf[len] = 0;
size = sizeof(*entry) + len + 1;
- event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags);
+ event = trace_buffer_lock_reserve(tr, TRACE_PRINT, size, irq_flags, pc);
if (!event)
goto out_unlock;
entry = ring_buffer_event_data(event);
- tracing_generic_entry_update(&entry->ent, flags, pc);
- entry->ent.type = TRACE_PRINT;
entry->ip = ip;
+ entry->depth = depth;
memcpy(&entry->buf, trace_buf, len);
entry->buf[len] = 0;
- ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+ ring_buffer_unlock_commit(tr->buffer, event);
out_unlock:
- spin_unlock_irqrestore(&trace_buf_lock, flags);
-
+ spin_unlock_irqrestore(&trace_buf_lock, irq_flags);
+ unpause_graph_tracing();
out:
preempt_enable_notrace();
return 0;
va_start(ap, fmt);
- ret = trace_vprintk(ip, fmt, ap);
+ ret = trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
va_end(ap);
return ret;
}
EXPORT_SYMBOL_GPL(__ftrace_printk);
+int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap)
+{
+ if (!(trace_flags & TRACE_ITER_PRINTK))
+ return 0;
+
+ return trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
+}
+EXPORT_SYMBOL_GPL(__ftrace_vprintk);
+
static int trace_panic_handler(struct notifier_block *this,
unsigned long event, void *unused)
{
- ftrace_dump();
+ if (ftrace_dump_on_oops)
+ ftrace_dump();
return NOTIFY_OK;
}
{
switch (val) {
case DIE_OOPS:
- ftrace_dump();
+ if (ftrace_dump_on_oops)
+ ftrace_dump();
break;
default:
break;
* it if we decide to change what log level the ftrace dump
* should be at.
*/
-#define KERN_TRACE KERN_INFO
+#define KERN_TRACE KERN_EMERG
static void
trace_printk_seq(struct trace_seq *s)
trace_seq_reset(s);
}
-
void ftrace_dump(void)
{
static DEFINE_SPINLOCK(ftrace_dump_lock);
/* use static because iter can be a bit big for the stack */
static struct trace_iterator iter;
- static cpumask_t mask;
static int dump_ran;
unsigned long flags;
int cnt = 0, cpu;
dump_ran = 1;
/* No turning back! */
+ tracing_off();
ftrace_kill();
for_each_tracing_cpu(cpu) {
atomic_inc(&global_trace.data[cpu]->disabled);
}
+ /* don't look at user memory in panic mode */
+ trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
+
printk(KERN_TRACE "Dumping ftrace buffer:\n");
iter.tr = &global_trace;
* and then release the locks again.
*/
- cpus_clear(mask);
-
while (!trace_empty(&iter)) {
if (!cnt)
{
struct trace_array_cpu *data;
int i;
+ int ret = -ENOMEM;
- /* TODO: make the number of buffers hot pluggable with CPUS */
- tracing_buffer_mask = cpu_possible_map;
+ if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL))
+ goto out;
+
+ if (!alloc_cpumask_var(&tracing_cpumask, GFP_KERNEL))
+ goto out_free_buffer_mask;
+ cpumask_copy(tracing_buffer_mask, cpu_possible_mask);
+ cpumask_copy(tracing_cpumask, cpu_all_mask);
+
+ /* TODO: make the number of buffers hot pluggable with CPUS */
global_trace.buffer = ring_buffer_alloc(trace_buf_size,
TRACE_BUFFER_FLAGS);
if (!global_trace.buffer) {
printk(KERN_ERR "tracer: failed to allocate ring buffer!\n");
WARN_ON(1);
- return 0;
+ goto out_free_cpumask;
}
global_trace.entries = ring_buffer_size(global_trace.buffer);
+
#ifdef CONFIG_TRACER_MAX_TRACE
max_tr.buffer = ring_buffer_alloc(trace_buf_size,
TRACE_BUFFER_FLAGS);
printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n");
WARN_ON(1);
ring_buffer_free(global_trace.buffer);
- return 0;
+ goto out_free_cpumask;
}
max_tr.entries = ring_buffer_size(max_tr.buffer);
WARN_ON(max_tr.entries != global_trace.entries);
trace_init_cmdlines();
register_tracer(&nop_trace);
+ current_trace = &nop_trace;
#ifdef CONFIG_BOOT_TRACER
register_tracer(&boot_tracer);
- current_trace = &boot_tracer;
- current_trace->init(&global_trace);
-#else
- current_trace = &nop_trace;
#endif
-
/* All seems OK, enable tracing */
- global_trace.ctrl = tracer_enabled;
tracing_disabled = 0;
atomic_notifier_chain_register(&panic_notifier_list,
&trace_panic_notifier);
register_die_notifier(&trace_die_notifier);
+ ret = 0;
+
+out_free_cpumask:
+ free_cpumask_var(tracing_cpumask);
+out_free_buffer_mask:
+ free_cpumask_var(tracing_buffer_mask);
+out:
+ return ret;
+}
+
+__init static int clear_boot_tracer(void)
+{
+ /*
+ * The default tracer at boot buffer is an init section.
+ * This function is called in lateinit. If we did not
+ * find the boot tracer, then clear it out, to prevent
+ * later registration from accessing the buffer that is
+ * about to be freed.
+ */
+ if (!default_bootup_tracer)
+ return 0;
+
+ printk(KERN_INFO "ftrace bootup tracer '%s' not registered.\n",
+ default_bootup_tracer);
+ default_bootup_tracer = NULL;
return 0;
}
+
early_initcall(tracer_alloc_buffers);
fs_initcall(tracer_init_debugfs);
+late_initcall(clear_boot_tracer);
git.openpandora.org / pandora-kernel.git / blobdiff