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authorAlexei Starovoitov <ast@fb.com>2016-04-06 18:43:27 -0700
committerDavid S. Miller <davem@davemloft.net>2016-04-07 21:04:26 -0400
commit9940d67c93b5bb7ddcf862b41b1847cb728186c4 (patch)
treee5b9a36df5bc8bde9b7435cda796d2cefe686e45
parent9fd82b610ba3351f05a59c3e9117cfefe82f7751 (diff)
bpf: support bpf_get_stackid() and bpf_perf_event_output() in tracepoint programs
needs two wrapper functions to fetch 'struct pt_regs *' to convert tracepoint bpf context into kprobe bpf context to reuse existing helper functions Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/bpf.h1
-rw-r--r--kernel/bpf/stackmap.c2
-rw-r--r--kernel/trace/bpf_trace.c42
3 files changed, 43 insertions, 2 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 21ee41b92e8a..198f6ace70ec 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -160,6 +160,7 @@ struct bpf_array {
#define MAX_TAIL_CALL_CNT 32
u64 bpf_tail_call(u64 ctx, u64 r2, u64 index, u64 r4, u64 r5);
+u64 bpf_get_stackid(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
void bpf_fd_array_map_clear(struct bpf_map *map);
bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 499d9e933f8e..35114725cf30 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -116,7 +116,7 @@ free_smap:
return ERR_PTR(err);
}
-static u64 bpf_get_stackid(u64 r1, u64 r2, u64 flags, u64 r4, u64 r5)
+u64 bpf_get_stackid(u64 r1, u64 r2, u64 flags, u64 r4, u64 r5)
{
struct pt_regs *regs = (struct pt_regs *) (long) r1;
struct bpf_map *map = (struct bpf_map *) (long) r2;
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 3e5ebe3254d2..413ec5614180 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -340,12 +340,52 @@ static struct bpf_prog_type_list kprobe_tl = {
.type = BPF_PROG_TYPE_KPROBE,
};
+static u64 bpf_perf_event_output_tp(u64 r1, u64 r2, u64 index, u64 r4, u64 size)
+{
+ /*
+ * r1 points to perf tracepoint buffer where first 8 bytes are hidden
+ * from bpf program and contain a pointer to 'struct pt_regs'. Fetch it
+ * from there and call the same bpf_perf_event_output() helper
+ */
+ u64 ctx = *(long *)r1;
+
+ return bpf_perf_event_output(ctx, r2, index, r4, size);
+}
+
+static const struct bpf_func_proto bpf_perf_event_output_proto_tp = {
+ .func = bpf_perf_event_output_tp,
+ .gpl_only = true,
+ .ret_type = RET_INTEGER,
+ .arg1_type = ARG_PTR_TO_CTX,
+ .arg2_type = ARG_CONST_MAP_PTR,
+ .arg3_type = ARG_ANYTHING,
+ .arg4_type = ARG_PTR_TO_STACK,
+ .arg5_type = ARG_CONST_STACK_SIZE,
+};
+
+static u64 bpf_get_stackid_tp(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5)
+{
+ u64 ctx = *(long *)r1;
+
+ return bpf_get_stackid(ctx, r2, r3, r4, r5);
+}
+
+static const struct bpf_func_proto bpf_get_stackid_proto_tp = {
+ .func = bpf_get_stackid_tp,
+ .gpl_only = true,
+ .ret_type = RET_INTEGER,
+ .arg1_type = ARG_PTR_TO_CTX,
+ .arg2_type = ARG_CONST_MAP_PTR,
+ .arg3_type = ARG_ANYTHING,
+};
+
static const struct bpf_func_proto *tp_prog_func_proto(enum bpf_func_id func_id)
{
switch (func_id) {
case BPF_FUNC_perf_event_output:
+ return &bpf_perf_event_output_proto_tp;
case BPF_FUNC_get_stackid:
- return NULL;
+ return &bpf_get_stackid_proto_tp;
default:
return tracing_func_proto(func_id);
}