[PATCH 04/19] perf intel-pt: Add lookahead callback

[Adrian Hunter]

Add a callback function to enable the decoder to lookahead at subsequent
trace buffers. This will be used to implement a "fast forward" facility
which will be needed to support efficient time interval filtering.

Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 ++
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.h | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index 9eb778f9c911..13123b195083 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -104,6 +104,7 @@ struct intel_pt_decoder {
 			 uint64_t *insn_cnt_ptr, uint64_t *ip, uint64_t to_ip,
 			 uint64_t max_insn_cnt, void *data);
 	bool (*pgd_ip)(uint64_t ip, void *data);
+	int (*lookahead)(void *data, intel_pt_lookahead_cb_t cb, void *cb_data);
 	void *data;
 	struct intel_pt_state state;
 	const unsigned char *buf;
@@ -233,6 +234,7 @@ struct intel_pt_decoder *intel_pt_decoder_new(struct intel_pt_params *params)
 	decoder->get_trace          = params->get_trace;
 	decoder->walk_insn          = params->walk_insn;
 	decoder->pgd_ip             = params->pgd_ip;
+	decoder->lookahead          = params->lookahead;
 	decoder->data               = params->data;
 	decoder->return_compression = params->return_compression;
 	decoder->branch_enable      = params->branch_enable;
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
index 6a61773dc44b..de36254c6ac9 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
@@ -102,12 +102,15 @@ struct intel_pt_buffer {
 	uint64_t trace_nr;
 };
 
+typedef int (*intel_pt_lookahead_cb_t)(struct intel_pt_buffer *, void *);
+
 struct intel_pt_params {
 	int (*get_trace)(struct intel_pt_buffer *buffer, void *data);
 	int (*walk_insn)(struct intel_pt_insn *intel_pt_insn,
 			 uint64_t *insn_cnt_ptr, uint64_t *ip, uint64_t to_ip,
 			 uint64_t max_insn_cnt, void *data);
 	bool (*pgd_ip)(uint64_t ip, void *data);
+	int (*lookahead)(void *data, intel_pt_lookahead_cb_t cb, void *cb_data);
 	void *data;
 	bool return_compression;
 	bool branch_enable;
-- 
2.17.1