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-rw-r--r--kernel/trace/Makefile4
-rw-r--r--kernel/trace/ftrace.c40
-rw-r--r--kernel/trace/power-traces.c1
-rw-r--r--kernel/trace/ring_buffer.c40
-rw-r--r--kernel/trace/trace.c8
-rw-r--r--kernel/trace/trace_event_perf.c4
-rw-r--r--kernel/trace/trace_kprobe.c4
-rw-r--r--kernel/trace/trace_seq.c2
-rw-r--r--kernel/trace/trace_syscalls.c4
-rw-r--r--kernel/trace/trace_uprobe.c2
10 files changed, 81 insertions, 28 deletions
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 979ccde26720..98f26588255e 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -3,11 +3,11 @@
ifdef CONFIG_FUNCTION_TRACER
ORIG_CFLAGS := $(KBUILD_CFLAGS)
-KBUILD_CFLAGS = $(subst -pg,,$(ORIG_CFLAGS))
+KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS))
ifdef CONFIG_FTRACE_SELFTEST
# selftest needs instrumentation
-CFLAGS_trace_selftest_dynamic.o = -pg
+CFLAGS_trace_selftest_dynamic.o = $(CC_FLAGS_FTRACE)
obj-y += trace_selftest_dynamic.o
endif
endif
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index fcc0e7052a79..5a2e0b53af30 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1059,6 +1059,12 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
static struct pid * const ftrace_swapper_pid = &init_struct_pid;
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+static int ftrace_graph_active;
+#else
+# define ftrace_graph_active 0
+#endif
+
#ifdef CONFIG_DYNAMIC_FTRACE
static struct ftrace_ops *removed_ops;
@@ -2041,8 +2047,12 @@ static int ftrace_check_record(struct dyn_ftrace *rec, int enable, int update)
if (!ftrace_rec_count(rec))
rec->flags = 0;
else
- /* Just disable the record (keep REGS state) */
- rec->flags &= ~FTRACE_FL_ENABLED;
+ /*
+ * Just disable the record, but keep the ops TRAMP
+ * and REGS states. The _EN flags must be disabled though.
+ */
+ rec->flags &= ~(FTRACE_FL_ENABLED | FTRACE_FL_TRAMP_EN |
+ FTRACE_FL_REGS_EN);
}
return FTRACE_UPDATE_MAKE_NOP;
@@ -2688,24 +2698,36 @@ static int ftrace_shutdown(struct ftrace_ops *ops, int command)
static void ftrace_startup_sysctl(void)
{
+ int command;
+
if (unlikely(ftrace_disabled))
return;
/* Force update next time */
saved_ftrace_func = NULL;
/* ftrace_start_up is true if we want ftrace running */
- if (ftrace_start_up)
- ftrace_run_update_code(FTRACE_UPDATE_CALLS);
+ if (ftrace_start_up) {
+ command = FTRACE_UPDATE_CALLS;
+ if (ftrace_graph_active)
+ command |= FTRACE_START_FUNC_RET;
+ ftrace_startup_enable(command);
+ }
}
static void ftrace_shutdown_sysctl(void)
{
+ int command;
+
if (unlikely(ftrace_disabled))
return;
/* ftrace_start_up is true if ftrace is running */
- if (ftrace_start_up)
- ftrace_run_update_code(FTRACE_DISABLE_CALLS);
+ if (ftrace_start_up) {
+ command = FTRACE_DISABLE_CALLS;
+ if (ftrace_graph_active)
+ command |= FTRACE_STOP_FUNC_RET;
+ ftrace_run_update_code(command);
+ }
}
static cycle_t ftrace_update_time;
@@ -5558,12 +5580,12 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
if (ftrace_enabled) {
- ftrace_startup_sysctl();
-
/* we are starting ftrace again */
if (ftrace_ops_list != &ftrace_list_end)
update_ftrace_function();
+ ftrace_startup_sysctl();
+
} else {
/* stopping ftrace calls (just send to ftrace_stub) */
ftrace_trace_function = ftrace_stub;
@@ -5590,8 +5612,6 @@ static struct ftrace_ops graph_ops = {
ASSIGN_OPS_HASH(graph_ops, &global_ops.local_hash)
};
-static int ftrace_graph_active;
-
int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace)
{
return 0;
diff --git a/kernel/trace/power-traces.c b/kernel/trace/power-traces.c
index 1c71382b283d..eb4220a132ec 100644
--- a/kernel/trace/power-traces.c
+++ b/kernel/trace/power-traces.c
@@ -13,5 +13,6 @@
#define CREATE_TRACE_POINTS
#include <trace/events/power.h>
+EXPORT_TRACEPOINT_SYMBOL_GPL(suspend_resume);
EXPORT_TRACEPOINT_SYMBOL_GPL(cpu_idle);
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 96079180de3d..5040d44fe5a3 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -445,7 +445,10 @@ int ring_buffer_print_page_header(struct trace_seq *s)
struct rb_irq_work {
struct irq_work work;
wait_queue_head_t waiters;
+ wait_queue_head_t full_waiters;
bool waiters_pending;
+ bool full_waiters_pending;
+ bool wakeup_full;
};
/*
@@ -527,6 +530,10 @@ static void rb_wake_up_waiters(struct irq_work *work)
struct rb_irq_work *rbwork = container_of(work, struct rb_irq_work, work);
wake_up_all(&rbwork->waiters);
+ if (rbwork->wakeup_full) {
+ rbwork->wakeup_full = false;
+ wake_up_all(&rbwork->full_waiters);
+ }
}
/**
@@ -551,9 +558,11 @@ int ring_buffer_wait(struct ring_buffer *buffer, int cpu, bool full)
* data in any cpu buffer, or a specific buffer, put the
* caller on the appropriate wait queue.
*/
- if (cpu == RING_BUFFER_ALL_CPUS)
+ if (cpu == RING_BUFFER_ALL_CPUS) {
work = &buffer->irq_work;
- else {
+ /* Full only makes sense on per cpu reads */
+ full = false;
+ } else {
if (!cpumask_test_cpu(cpu, buffer->cpumask))
return -ENODEV;
cpu_buffer = buffer->buffers[cpu];
@@ -562,7 +571,10 @@ int ring_buffer_wait(struct ring_buffer *buffer, int cpu, bool full)
while (true) {
- prepare_to_wait(&work->waiters, &wait, TASK_INTERRUPTIBLE);
+ if (full)
+ prepare_to_wait(&work->full_waiters, &wait, TASK_INTERRUPTIBLE);
+ else
+ prepare_to_wait(&work->waiters, &wait, TASK_INTERRUPTIBLE);
/*
* The events can happen in critical sections where
@@ -584,7 +596,10 @@ int ring_buffer_wait(struct ring_buffer *buffer, int cpu, bool full)
* that is necessary is that the wake up happens after
* a task has been queued. It's OK for spurious wake ups.
*/
- work->waiters_pending = true;
+ if (full)
+ work->full_waiters_pending = true;
+ else
+ work->waiters_pending = true;
if (signal_pending(current)) {
ret = -EINTR;
@@ -613,7 +628,10 @@ int ring_buffer_wait(struct ring_buffer *buffer, int cpu, bool full)
schedule();
}
- finish_wait(&work->waiters, &wait);
+ if (full)
+ finish_wait(&work->full_waiters, &wait);
+ else
+ finish_wait(&work->waiters, &wait);
return ret;
}
@@ -1228,6 +1246,7 @@ rb_allocate_cpu_buffer(struct ring_buffer *buffer, int nr_pages, int cpu)
init_completion(&cpu_buffer->update_done);
init_irq_work(&cpu_buffer->irq_work.work, rb_wake_up_waiters);
init_waitqueue_head(&cpu_buffer->irq_work.waiters);
+ init_waitqueue_head(&cpu_buffer->irq_work.full_waiters);
bpage = kzalloc_node(ALIGN(sizeof(*bpage), cache_line_size()),
GFP_KERNEL, cpu_to_node(cpu));
@@ -2799,6 +2818,8 @@ static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
static __always_inline void
rb_wakeups(struct ring_buffer *buffer, struct ring_buffer_per_cpu *cpu_buffer)
{
+ bool pagebusy;
+
if (buffer->irq_work.waiters_pending) {
buffer->irq_work.waiters_pending = false;
/* irq_work_queue() supplies it's own memory barriers */
@@ -2810,6 +2831,15 @@ rb_wakeups(struct ring_buffer *buffer, struct ring_buffer_per_cpu *cpu_buffer)
/* irq_work_queue() supplies it's own memory barriers */
irq_work_queue(&cpu_buffer->irq_work.work);
}
+
+ pagebusy = cpu_buffer->reader_page == cpu_buffer->commit_page;
+
+ if (!pagebusy && cpu_buffer->irq_work.full_waiters_pending) {
+ cpu_buffer->irq_work.wakeup_full = true;
+ cpu_buffer->irq_work.full_waiters_pending = false;
+ /* irq_work_queue() supplies it's own memory barriers */
+ irq_work_queue(&cpu_buffer->irq_work.work);
+ }
}
/**
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 3c8913bac204..bcfa2add6dda 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3355,12 +3355,12 @@ tracing_cpumask_read(struct file *filp, char __user *ubuf,
mutex_lock(&tracing_cpumask_update_lock);
- len = cpumask_scnprintf(mask_str, count, tr->tracing_cpumask);
- if (count - len < 2) {
+ len = snprintf(mask_str, count, "%*pb\n",
+ cpumask_pr_args(tr->tracing_cpumask));
+ if (len >= count) {
count = -EINVAL;
goto out_err;
}
- len += sprintf(mask_str + len, "\n");
count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1);
out_err:
@@ -4941,7 +4941,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
*fpos += written;
out_unlock:
- for (i = 0; i < nr_pages; i++){
+ for (i = nr_pages - 1; i >= 0; i--) {
kunmap_atomic(map_page[i]);
put_page(pages[i]);
}
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 4b9c114ee9de..6fa484de2ba1 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -261,7 +261,7 @@ void perf_trace_del(struct perf_event *p_event, int flags)
}
void *perf_trace_buf_prepare(int size, unsigned short type,
- struct pt_regs *regs, int *rctxp)
+ struct pt_regs **regs, int *rctxp)
{
struct trace_entry *entry;
unsigned long flags;
@@ -280,6 +280,8 @@ void *perf_trace_buf_prepare(int size, unsigned short type,
if (*rctxp < 0)
return NULL;
+ if (regs)
+ *regs = this_cpu_ptr(&__perf_regs[*rctxp]);
raw_data = this_cpu_ptr(perf_trace_buf[*rctxp]);
/* zero the dead bytes from align to not leak stack to user */
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index c1c6655847c8..ed998fbf09ce 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1148,7 +1148,7 @@ kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs)
size = ALIGN(__size + sizeof(u32), sizeof(u64));
size -= sizeof(u32);
- entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
+ entry = perf_trace_buf_prepare(size, call->event.type, NULL, &rctx);
if (!entry)
return;
@@ -1179,7 +1179,7 @@ kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
size = ALIGN(__size + sizeof(u32), sizeof(u64));
size -= sizeof(u32);
- entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
+ entry = perf_trace_buf_prepare(size, call->event.type, NULL, &rctx);
if (!entry)
return;
diff --git a/kernel/trace/trace_seq.c b/kernel/trace/trace_seq.c
index f8b45d8792f9..e694c9f9efa4 100644
--- a/kernel/trace/trace_seq.c
+++ b/kernel/trace/trace_seq.c
@@ -120,7 +120,7 @@ void trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
__trace_seq_init(s);
- seq_buf_bitmask(&s->seq, maskp, nmaskbits);
+ seq_buf_printf(&s->seq, "%*pb", nmaskbits, maskp);
if (unlikely(seq_buf_has_overflowed(&s->seq))) {
s->seq.len = save_len;
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index c6ee36fcbf90..f97f6e3a676c 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -574,7 +574,7 @@ static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id)
size -= sizeof(u32);
rec = (struct syscall_trace_enter *)perf_trace_buf_prepare(size,
- sys_data->enter_event->event.type, regs, &rctx);
+ sys_data->enter_event->event.type, NULL, &rctx);
if (!rec)
return;
@@ -647,7 +647,7 @@ static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
size -= sizeof(u32);
rec = (struct syscall_trace_exit *)perf_trace_buf_prepare(size,
- sys_data->exit_event->event.type, regs, &rctx);
+ sys_data->exit_event->event.type, NULL, &rctx);
if (!rec)
return;
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 5f0eba9e5e6b..7dc1c8abecd6 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -1111,7 +1111,7 @@ static void __uprobe_perf_func(struct trace_uprobe *tu,
if (hlist_empty(head))
goto out;
- entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
+ entry = perf_trace_buf_prepare(size, call->event.type, NULL, &rctx);
if (!entry)
goto out;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.