From 7dde51767ca5339ed33109056d92fdca05d56d8d Mon Sep 17 00:00:00 2001 From: Suzuki K Poulose Date: Mon, 5 Apr 2021 17:42:49 +0100 Subject: [PATCH] perf: aux: Add CoreSight PMU buffer formats CoreSight PMU supports aux-buffer for the ETM tracing. The trace generated by the ETM (associated with individual CPUs, like Intel PT) is captured by a separate IP (CoreSight TMC-ETR/ETF until now). The TMC-ETR applies formatting of the raw ETM trace data, as it can collect traces from multiple ETMs, with the TraceID to indicate the source of a given trace packet. Arm Trace Buffer Extension is new "sink" IP, attached to individual CPUs and thus do not provide additional formatting, like TMC-ETR. Additionally, a system could have both TRBE *and* TMC-ETR for the trace collection. e.g, TMC-ETR could be used as a single trace buffer to collect data from multiple ETMs to correlate the traces from different CPUs. It is possible to have a perf session where some events end up collecting the trace in TMC-ETR while the others in TRBE. Thus we need a way to identify the type of the trace for each AUX record. Define the trace formats exported by the CoreSight PMU. We don't define the flags following the "ETM" as this information is available to the user when issuing the session. What is missing is the additional formatting applied by the "sink" which is decided at the runtime and the user may not have a control on. So we define : - CORESIGHT format (indicates the Frame format) - RAW format (indicates the format of the source) The default value is CORESIGHT format for all the records (i,e == 0). Add the RAW format for others that use raw format. Cc: Peter Zijlstra Cc: Mike Leach Cc: Mathieu Poirier Cc: Leo Yan Cc: Anshuman Khandual Reviewed-by: Mike Leach Signed-off-by: Suzuki K Poulose Link: https://lore.kernel.org/r/20210405164307.1720226-3-suzuki.poulose@arm.com Signed-off-by: Mathieu Poirier --- include/uapi/linux/perf_event.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index f006eea..63971ea 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -1162,6 +1162,10 @@ enum perf_callchain_context { #define PERF_AUX_FLAG_COLLISION 0x08 /* sample collided with another */ #define PERF_AUX_FLAG_PMU_FORMAT_TYPE_MASK 0xff00 /* PMU specific trace format type */ +/* CoreSight PMU AUX buffer formats */ +#define PERF_AUX_FLAG_CORESIGHT_FORMAT_CORESIGHT 0x0000 /* Default for backward compatibility */ +#define PERF_AUX_FLAG_CORESIGHT_FORMAT_RAW 0x0100 /* Raw format of the source */ + #define PERF_FLAG_FD_NO_GROUP (1UL << 0) #define PERF_FLAG_FD_OUTPUT (1UL << 1) #define PERF_FLAG_PID_CGROUP (1UL << 2) /* pid=cgroup id, per-cpu mode only */ -- 2.7.4