perf, bpf: allow bpf programs attach to tracepoints

introduce BPF_PROG_TYPE_TRACEPOINT program type and allow it to be attached
to the perf tracepoint handler, which will copy the arguments into
the per-cpu buffer and pass it to the bpf program as its first argument.
The layout of the fields can be discovered by doing
'cat /sys/kernel/debug/tracing/events/sched/sched_switch/format'
prior to the compilation of the program with exception that first 8 bytes
are reserved and not accessible to the program. This area is used to store
the pointer to 'struct pt_regs' which some of the bpf helpers will use:
+---------+
| 8 bytes | hidden 'struct pt_regs *' (inaccessible to bpf program)
+---------+
| N bytes | static tracepoint fields defined in tracepoint/format (bpf readonly)
+---------+
| dynamic | __dynamic_array bytes of tracepoint (inaccessible to bpf yet)
+---------+

Not that all of the fields are already dumped to user space via perf ring buffer
and broken application access it directly without consulting tracepoint/format.
Same rule applies here: static tracepoint fields should only be accessed
in a format defined in tracepoint/format. The order of fields and
field sizes are not an ABI.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 19 insertions, 5 deletions

diff --git a/include/trace/perf.h b/include/trace/perf.h
index 77cd9043b7e4..a182306eefd7 100644
--- a/include/trace/perf.h
+++ b/include/trace/perf.h
@@ -34,6 +34,7 @@ perf_trace_##call(void *__data, proto)					\
         struct trace_event_call *event_call = __data;                   \
         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
         struct trace_event_raw_##call *entry;                           \
+        struct bpf_prog *prog = event_call->prog;                       \
         struct pt_regs *__regs;                                         \
         u64 __count = 1;                                                \
         struct task_struct *__task = NULL;                              \
@@ -45,7 +46,7 @@ perf_trace_##call(void *__data, proto)					\
         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
                                                                         \
         head = this_cpu_ptr(event_call->perf_events);                   \
-        if (__builtin_constant_p(!__task) && !__task &&                 \
+        if (!prog && __builtin_constant_p(!__task) && !__task &&        \
                                 hlist_empty(head))                      \
                 return;                                                 \
                                                                         \
@@ -63,6 +64,13 @@ perf_trace_##call(void *__data, proto)					\
                                                                         \
         { assign; }                                                     \
                                                                         \
+        if (prog) {                                                     \
+                *(struct pt_regs **)entry = __regs;                     \
+                if (!trace_call_bpf(prog, entry) || hlist_empty(head)) { \
+                        perf_swevent_put_recursion_context(rctx);       \
+                        return;                                         \
+                }                                                       \
+        }                                                               \
         perf_trace_buf_submit(entry, __entry_size, rctx,                \
                               event_call->event.type, __count, __regs,  \
                               head, __task);                            \
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 23917bb47bf3..70eda5aeb304 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -92,6 +92,7 @@ enum bpf_prog_type {
         BPF_PROG_TYPE_KPROBE,
         BPF_PROG_TYPE_SCHED_CLS,
         BPF_PROG_TYPE_SCHED_ACT,
+        BPF_PROG_TYPE_TRACEPOINT,
 };
 
 #define BPF_PSEUDO_MAP_FD       1
diff --git a/kernel/events/core.c b/kernel/events/core.c
index d8512883c0a0..e5ffe97d6166 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6725,12 +6725,13 @@ int perf_swevent_get_recursion_context(void)
 }
 EXPORT_SYMBOL_GPL(perf_swevent_get_recursion_context);
 
-inline void perf_swevent_put_recursion_context(int rctx)
+void perf_swevent_put_recursion_context(int rctx)
 {
         struct swevent_htable *swhash = this_cpu_ptr(&swevent_htable);
 
         put_recursion_context(swhash->recursion, rctx);
 }
+EXPORT_SYMBOL_GPL(perf_swevent_put_recursion_context);
 
 void ___perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
 {
@@ -7106,6 +7107,7 @@ static void perf_event_free_filter(struct perf_event *event)
 
 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_TRACEPOINT)
@@ -7114,15 +7116,18 @@ static int perf_event_set_bpf_prog(struct perf_event *event, u32 prog_fd)
         if (event->tp_event->prog)
                 return -EEXIST;
 
-        if (!(event->tp_event->flags & TRACE_EVENT_FL_UKPROBE))
-                /* bpf programs can only be attached to u/kprobes */
+        is_kprobe = event->tp_event->flags & TRACE_EVENT_FL_UKPROBE;
+        is_tracepoint = event->tp_event->flags & TRACE_EVENT_FL_TRACEPOINT;
+        if (!is_kprobe && !is_tracepoint)
+                /* bpf programs can only be attached to u/kprobe or tracepoint */
                 return -EINVAL;
 
         prog = bpf_prog_get(prog_fd);
         if (IS_ERR(prog))
                 return PTR_ERR(prog);
 
-        if (prog->type != BPF_PROG_TYPE_KPROBE) {
+        if ((is_kprobe && prog->type != BPF_PROG_TYPE_KPROBE) ||
+            (is_tracepoint && prog->type != BPF_PROG_TYPE_TRACEPOINT)) {
                 /* valid fd, but invalid bpf program type */
                 bpf_prog_put(prog);
                 return -EINVAL;