[PATCH 33/43] perf tools: Add functionality to communicate with the openCSD decoder

From: Arnaldo Carvalho de Melo
Date: Tue Jan 23 2018 - 08:18:07 EST


From: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>

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@xxxxxx>
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Kim Phillips <kim.phillips@xxxxxxx>
Cc: Mike Leach <mike.leach@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Suzuki Poulouse <suzuki.poulose@xxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1516211539-5166-7-git-send-email-mathieu.poirier@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
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__ */
--
2.14.3