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Subject[PATCH v2 12/17] coresight: trbe: Add a helper to fetch cpudata from perf handle
Date
Add a helper to get the CPU specific data for TRBE instance, from
a given perf handle. This also adds extra checks to make sure that
the event associated with the handle is "bound" to the CPU and is
active on the TRBE.

Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
drivers/hwtracing/coresight/coresight-trbe.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
index 983dd5039e52..797d978f9fa7 100644
--- a/drivers/hwtracing/coresight/coresight-trbe.c
+++ b/drivers/hwtracing/coresight/coresight-trbe.c
@@ -268,6 +268,15 @@ static unsigned long trbe_snapshot_offset(struct perf_output_handle *handle)
return buf->nr_pages * PAGE_SIZE;
}

+static inline struct trbe_cpudata *
+trbe_handle_to_cpudata(struct perf_output_handle *handle)
+{
+ struct trbe_buf *buf = etm_perf_sink_config(handle);
+
+ BUG_ON(!buf || !buf->cpudata);
+ return buf->cpudata;
+}
+
/*
* TRBE Limit Calculation
*
@@ -533,8 +542,7 @@ static enum trbe_fault_action trbe_get_fault_act(struct perf_output_handle *hand
{
int ec = get_trbe_ec(trbsr);
int bsc = get_trbe_bsc(trbsr);
- struct trbe_buf *buf = etm_perf_sink_config(handle);
- struct trbe_cpudata *cpudata = buf->cpudata;
+ struct trbe_cpudata *cpudata = trbe_handle_to_cpudata(handle);

WARN_ON(is_trbe_running(trbsr));
if (is_trbe_trg(trbsr) || is_trbe_abort(trbsr))
--
2.24.1
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