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authorMathieu Poirier <mathieu.poirier@linaro.org>2016-02-18 03:52:02 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-02-21 01:11:01 +0300
commit17534ceb835a1a96eb921a2a80df168723d6570a (patch)
tree6cbfd344150ab19190bf415ef4c328ccbf9dcf3d /include/linux/coresight-pmu.h
parent0bcbf2e30ff2271b54f54c8697a185f7d86ec6e4 (diff)
downloadlinux-17534ceb835a1a96eb921a2a80df168723d6570a.tar.xz
coresight: introducing a global trace ID function
TraceID values have to be unique for all tracers and consistent between drivers and user space. As such introducing a central function to be used whenever a traceID value is required. The patch also account for data traceIDs, which are usually I(N) + 1. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/coresight-pmu.h')
-rw-r--r--include/linux/coresight-pmu.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/coresight-pmu.h b/include/linux/coresight-pmu.h
index 6c5386b23b10..7d410260661b 100644
--- a/include/linux/coresight-pmu.h
+++ b/include/linux/coresight-pmu.h
@@ -19,9 +19,21 @@
#define _LINUX_CORESIGHT_PMU_H
#define CORESIGHT_ETM_PMU_NAME "cs_etm"
+#define CORESIGHT_ETM_PMU_SEED 0x10
/* ETMv3.5/PTM's ETMCR config bit */
#define ETM_OPT_CYCACC 12
#define ETM_OPT_TS 28
+static inline int coresight_get_trace_id(int cpu)
+{
+ /*
+ * A trace ID of value 0 is invalid, so let's start at some
+ * random value that fits in 7 bits and go from there. Since
+ * the common convention is to have data trace IDs be I(N) + 1,
+ * set instruction trace IDs as a function of the CPU number.
+ */
+ return (CORESIGHT_ETM_PMU_SEED + (cpu * 2));
+}
+
#endif