linux-kernel - [PATCH v2 12/17] coresight: trbe: Add a helper to fetch cpudata from perf handle

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Date:   Tue, 21 Sep 2021 14:41:16 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, maz@...nel.org,
        catalin.marinas@....com, mark.rutland@....com, james.morse@....com,
        anshuman.khandual@....com, leo.yan@...aro.org,
        mike.leach@...aro.org, mathieu.poirier@...aro.org, will@...nel.org,
        lcherian@...vell.com, coresight@...ts.linaro.org,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v2 12/17] coresight: trbe: Add a helper to fetch cpudata from perf handle

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@....com>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Leo Yan <leo.yan@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....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