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authorAlexei Starovoitov <ast@fb.com>2016-09-01 18:37:24 -0700
committerDavid S. Miller <davem@davemloft.net>2016-09-02 10:46:44 -0700
commitaa6a5f3cb2b2edc5b9aab0b4fdfdfa9c3b5096a8 (patch)
tree8cf03de3cadf8e080094e1d1c671ada0d85d1ec2 /kernel
parentfdc15d388d600d5a1599e14c700af105a5b60761 (diff)
perf, bpf: add perf events core support for BPF_PROG_TYPE_PERF_EVENT programs
Allow attaching BPF_PROG_TYPE_PERF_EVENT programs to sw and hw perf events via overflow_handler mechanism. When program is attached the overflow_handlers become stacked. The program acts as a filter. Returning zero from the program means that the normal perf_event_output handler will not be called and sampling event won't be stored in the ring buffer. The overflow_handler_context==NULL is an additional safety check to make sure programs are not attached to hw breakpoints and watchdog in case other checks (that prevent that now anyway) get accidentally relaxed in the future. The program refcnt is incremented in case perf_events are inhereted when target task is forked. Similar to kprobe and tracepoint programs there is no ioctl to detach the program or swap already attached program. The user space expected to close(perf_event_fd) like it does right now for kprobe+bpf. That restriction simplifies the code quite a bit. The invocation of overflow_handler in __perf_event_overflow() is now done via READ_ONCE, since that pointer can be replaced when the program is attached while perf_event itself could have been active already. There is no need to do similar treatment for event->prog, since it's assigned only once before it's accessed. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/core.c89
1 files changed, 88 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 3cfabdf7b942..85bf4c37911f 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7022,7 +7022,7 @@ static int __perf_event_overflow(struct perf_event *event,
irq_work_queue(&event->pending);
}
- event->overflow_handler(event, data, regs);
+ READ_ONCE(event->overflow_handler)(event, data, regs);
if (*perf_event_fasync(event) && event->pending_kill) {
event->pending_wakeup = 1;
@@ -7637,11 +7637,83 @@ static void perf_event_free_filter(struct perf_event *event)
ftrace_profile_free_filter(event);
}
+#ifdef CONFIG_BPF_SYSCALL
+static void bpf_overflow_handler(struct perf_event *event,
+ struct perf_sample_data *data,
+ struct pt_regs *regs)
+{
+ struct bpf_perf_event_data_kern ctx = {
+ .data = data,
+ .regs = regs,
+ };
+ int ret = 0;
+
+ preempt_disable();
+ if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1))
+ goto out;
+ rcu_read_lock();
+ ret = BPF_PROG_RUN(event->prog, (void *)&ctx);
+ rcu_read_unlock();
+out:
+ __this_cpu_dec(bpf_prog_active);
+ preempt_enable();
+ if (!ret)
+ return;
+
+ event->orig_overflow_handler(event, data, regs);
+}
+
+static int perf_event_set_bpf_handler(struct perf_event *event, u32 prog_fd)
+{
+ struct bpf_prog *prog;
+
+ if (event->overflow_handler_context)
+ /* hw breakpoint or kernel counter */
+ return -EINVAL;
+
+ if (event->prog)
+ return -EEXIST;
+
+ prog = bpf_prog_get_type(prog_fd, BPF_PROG_TYPE_PERF_EVENT);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ event->prog = prog;
+ event->orig_overflow_handler = READ_ONCE(event->overflow_handler);
+ WRITE_ONCE(event->overflow_handler, bpf_overflow_handler);
+ return 0;
+}
+
+static void perf_event_free_bpf_handler(struct perf_event *event)
+{
+ struct bpf_prog *prog = event->prog;
+
+ if (!prog)
+ return;
+
+ WRITE_ONCE(event->overflow_handler, event->orig_overflow_handler);
+ event->prog = NULL;
+ bpf_prog_put(prog);
+}
+#else
+static int perf_event_set_bpf_handler(struct perf_event *event, u32 prog_fd)
+{
+ return -EOPNOTSUPP;
+}
+static void perf_event_free_bpf_handler(struct perf_event *event)
+{
+}
+#endif
+
static int perf_event_set_bpf_prog(struct perf_event *event, u32 prog_fd)
{
bool is_kprobe, is_tracepoint;
struct bpf_prog *prog;
+ if (event->attr.type == PERF_TYPE_HARDWARE ||
+ event->attr.type == PERF_TYPE_SOFTWARE)
+ return perf_event_set_bpf_handler(event, prog_fd);
+
if (event->attr.type != PERF_TYPE_TRACEPOINT)
return -EINVAL;
@@ -7682,6 +7754,8 @@ static void perf_event_free_bpf_prog(struct perf_event *event)
{
struct bpf_prog *prog;
+ perf_event_free_bpf_handler(event);
+
if (!event->tp_event)
return;
@@ -8998,6 +9072,19 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
if (!overflow_handler && parent_event) {
overflow_handler = parent_event->overflow_handler;
context = parent_event->overflow_handler_context;
+#ifdef CONFIG_BPF_SYSCALL
+ if (overflow_handler == bpf_overflow_handler) {
+ struct bpf_prog *prog = bpf_prog_inc(parent_event->prog);
+
+ if (IS_ERR(prog)) {
+ err = PTR_ERR(prog);
+ goto err_ns;
+ }
+ event->prog = prog;
+ event->orig_overflow_handler =
+ parent_event->orig_overflow_handler;
+ }
+#endif
}
if (overflow_handler) {