linux-kernel - [PATCH 06/10] perf tools: Add functionality to communicate with the openCSD decoder

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Date:   Fri, 15 Dec 2017 09:44:55 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     acme@...nel.org
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        adrian.hunter@...el.com, mike.leach@....com,
        suzuki.poulosi@....com, tor@...com, jolsa@...hat.com,
        mathieu.poirier@...aro.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 06/10] perf tools: Add functionality to communicate with the openCSD decoder

This patch adds functions to communicate with the openCSD trace decoder,
more specifically to access program memory, fetch trace packets and
reset the decoder.

Co-authored-by: Tor Jeremiassen <tor@...com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 60 +++++++++++++++++++++++++
 tools/perf/util/cs-etm-decoder/cs-etm-decoder.h |  9 ++++
 2 files changed, 69 insertions(+)

diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
index 57b020b0b36f..1fb01849f1c7 100644
--- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
@@ -45,6 +45,66 @@ struct cs_etm_decoder {
 	struct cs_etm_packet packet_buffer[MAX_BUFFER];
 };
 
+static u32
+cs_etm_decoder__mem_access(const void *context,
+			   const ocsd_vaddr_t address,
+			   const ocsd_mem_space_acc_t mem_space __maybe_unused,
+			   const u32 req_size,
+			   u8 *buffer)
+{
+	struct cs_etm_decoder *decoder = (struct cs_etm_decoder *) context;
+
+	return decoder->mem_access(decoder->data,
+				   address,
+				   req_size,
+				   buffer);
+}
+
+int cs_etm_decoder__add_mem_access_cb(struct cs_etm_decoder *decoder,
+				      u64 start, u64 end,
+				      cs_etm_mem_cb_type cb_func)
+{
+	decoder->mem_access = cb_func;
+
+	if (ocsd_dt_add_callback_mem_acc(decoder->dcd_tree, start, end,
+					 OCSD_MEM_SPACE_ANY,
+					 cs_etm_decoder__mem_access, decoder))
+		return -1;
+
+	return 0;
+}
+
+int cs_etm_decoder__reset(struct cs_etm_decoder *decoder)
+{
+	ocsd_datapath_resp_t dp_ret;
+
+	dp_ret = ocsd_dt_process_data(decoder->dcd_tree, OCSD_OP_RESET,
+				      0, 0, NULL, NULL);
+	if (OCSD_DATA_RESP_IS_FATAL(dp_ret))
+		return -1;
+
+	return 0;
+}
+
+int cs_etm_decoder__get_packet(struct cs_etm_decoder *decoder,
+			       struct cs_etm_packet *packet)
+{
+	if (!decoder || !packet)
+		return -EINVAL;
+
+	/* Nothing to do, might as well just return */
+	if (decoder->packet_count == 0)
+		return 0;
+
+	*packet = decoder->packet_buffer[decoder->head];
+
+	decoder->head = (decoder->head + 1) & (MAX_BUFFER - 1);
+
+	decoder->packet_count--;
+
+	return 1;
+}
+
 static void cs_etm_decoder__gen_etmv4_config(struct cs_etm_trace_params *params,
 					     ocsd_etmv4_cfg *config)
 {
diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h
index a1e9b0ac5965..3d2e6205d186 100644
--- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h
@@ -93,4 +93,13 @@ cs_etm_decoder__new(int num_cpu,
 
 void cs_etm_decoder__free(struct cs_etm_decoder *decoder);
 
+int cs_etm_decoder__add_mem_access_cb(struct cs_etm_decoder *decoder,
+				      u64 start, u64 end,
+				      cs_etm_mem_cb_type cb_func);
+
+int cs_etm_decoder__get_packet(struct cs_etm_decoder *decoder,
+			       struct cs_etm_packet *packet);
+
+int cs_etm_decoder__reset(struct cs_etm_decoder *decoder);
+
 #endif /* INCLUDE__CS_ETM_DECODER_H__ */
-- 
2.7.4