linux-kernel - [PATCH v4 08/13] coresight: Interpret perf config with ATTR_CFG_GET

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Message-Id: <20251112-james-cs-syncfreq-v4-8-165ba21401dc@linaro.org>
Date: Wed, 12 Nov 2025 15:22:14 +0000
From: James Clark <james.clark@...aro.org>
To: Suzuki K Poulose <suzuki.poulose@....com>, 
 Mike Leach <mike.leach@...aro.org>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Jonathan Corbet <corbet@....net>, Leo Yan <leo.yan@....com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, 
 James Clark <james.clark@...aro.org>
Subject: [PATCH v4 08/13] coresight: Interpret perf config with
 ATTR_CFG_GET_FLD()

The "config:" string construction in format_attr_contextid_show() can be
removed because it either showed the existing context1 or context2
formats which have already been generated, so can be called themselves.

The other conversions are straightforward replacements.

Signed-off-by: James Clark <james.clark@...aro.org>
---
 drivers/hwtracing/coresight/coresight-etm-perf.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
index d19e2568a0d1..7272e758aebf 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.c
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
@@ -80,12 +80,11 @@ static ssize_t format_attr_contextid_show(struct device *dev,
 					  struct device_attribute *attr,
 					  char *page)
 {
-	int pid_fmt = ETM_OPT_CTXTID;
-
 #if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)
-	pid_fmt = is_kernel_in_hyp_mode() ? ETM_OPT_CTXTID2 : ETM_OPT_CTXTID;
+	if (is_kernel_in_hyp_mode())
+		return contextid2_show(dev, attr, page);
 #endif
-	return sprintf(page, "config:%d\n", pid_fmt);
+	return contextid1_show(dev, attr, page);
 }
 
 static struct device_attribute format_attr_contextid =
@@ -334,7 +333,7 @@ static bool sinks_compatible(struct coresight_device *a,
 static void *etm_setup_aux(struct perf_event *event, void **pages,
 			   int nr_pages, bool overwrite)
 {
-	u32 id, cfg_hash;
+	u32 sink_hash, cfg_hash;
 	int cpu = event->cpu;
 	cpumask_t *mask;
 	struct coresight_device *sink = NULL;
@@ -347,13 +346,12 @@ static void *etm_setup_aux(struct perf_event *event, void **pages,
 	INIT_WORK(&event_data->work, free_event_data);
 
 	/* First get the selected sink from user space. */
-	if (event->attr.config2 & GENMASK_ULL(31, 0)) {
-		id = (u32)event->attr.config2;
-		sink = user_sink = coresight_get_sink_by_id(id);
-	}
+	sink_hash = ATTR_CFG_GET_FLD(&event->attr, sinkid);
+	if (sink_hash)
+		sink = user_sink = coresight_get_sink_by_id(sink_hash);
 
 	/* check if user wants a coresight configuration selected */
-	cfg_hash = (u32)((event->attr.config2 & GENMASK_ULL(63, 32)) >> 32);
+	cfg_hash = ATTR_CFG_GET_FLD(&event->attr, configid);
 	if (cfg_hash) {
 		if (cscfg_activate_config(cfg_hash))
 			goto err;

-- 
2.34.1