linux-kernel - [PATCH 2/3] perf/arm-cmn: Add support for model specific parameters

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Message-Id: <20240126221215.1537377-3-ilkka@os.amperecomputing.com>
Date: Fri, 26 Jan 2024 14:12:14 -0800
From: Ilkka Koskinen <ilkka@...amperecomputing.com>
To: Robin Murphy <robin.murphy@....com>,
	Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>
Cc: Ilkka Koskinen <ilkka@...amperecomputing.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] perf/arm-cmn: Add support for model specific parameters

Newer models have slightly different parameter fields or may introduce
completely new ones. Thus, prepare for it by making also the parameters
model specific.

Signed-off-by: Ilkka Koskinen <ilkka@...amperecomputing.com>
---
 drivers/perf/arm-cmn.c | 45 +++++++++++++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 93eb47ea7e25..dc6370396ad0 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -628,6 +628,7 @@ struct arm_cmn_event_attr {
 
 struct arm_cmn_format_attr {
 	struct device_attribute attr;
+	enum cmn_model model;
 	u64 field;
 	int config;
 };
@@ -1265,29 +1266,44 @@ static ssize_t arm_cmn_format_show(struct device *dev,
 	return sysfs_emit(buf, "config%d:%d-%d\n", fmt->config, lo, hi);
 }
 
-#define _CMN_FORMAT_ATTR(_name, _cfg, _fld)				\
+static umode_t arm_cmn_format_attr_is_visible(struct kobject *kobj,
+					      struct attribute *attr,
+					      int unused)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct arm_cmn *cmn = to_cmn(dev_get_drvdata(dev));
+	struct arm_cmn_format_attr *fmt = container_of(attr, typeof(*fmt), attr.attr);
+
+	if (!(fmt->model & arm_cmn_model(cmn)))
+		return 0;
+
+	return attr->mode;
+}
+
+#define _CMN_FORMAT_ATTR(_model, _name, _cfg, _fld)			\
 	(&((struct arm_cmn_format_attr[]) {{				\
 		.attr = __ATTR(_name, 0444, arm_cmn_format_show, NULL),	\
+		.model = _model,					\
 		.config = _cfg,						\
 		.field = _fld,						\
 	}})[0].attr.attr)
-#define CMN_FORMAT_ATTR(_name, _fld)	_CMN_FORMAT_ATTR(_name, 0, _fld)
+#define CMN_FORMAT_ATTR(_model, _name, _fld)	_CMN_FORMAT_ATTR(_model, _name, 0, _fld)
 
 static struct attribute *arm_cmn_format_attrs[] = {
-	CMN_FORMAT_ATTR(type, CMN_CONFIG_TYPE),
-	CMN_FORMAT_ATTR(eventid, CMN_CONFIG_EVENTID),
-	CMN_FORMAT_ATTR(occupid, CMN_CONFIG_OCCUPID),
-	CMN_FORMAT_ATTR(bynodeid, CMN_CONFIG_BYNODEID),
-	CMN_FORMAT_ATTR(nodeid, CMN_CONFIG_NODEID),
+	CMN_FORMAT_ATTR(CMN_ANY, type, CMN_CONFIG_TYPE),
+	CMN_FORMAT_ATTR(CMN_ANY, eventid, CMN_CONFIG_EVENTID),
+	CMN_FORMAT_ATTR(CMN_ANY, occupid, CMN_CONFIG_OCCUPID),
+	CMN_FORMAT_ATTR(CMN_ANY, bynodeid, CMN_CONFIG_BYNODEID),
+	CMN_FORMAT_ATTR(CMN_ANY, nodeid, CMN_CONFIG_NODEID),
 
-	CMN_FORMAT_ATTR(wp_dev_sel, CMN_CONFIG_WP_DEV_SEL),
-	CMN_FORMAT_ATTR(wp_chn_sel, CMN_CONFIG_WP_CHN_SEL),
-	CMN_FORMAT_ATTR(wp_grp, CMN_CONFIG_WP_GRP),
-	CMN_FORMAT_ATTR(wp_exclusive, CMN_CONFIG_WP_EXCLUSIVE),
-	CMN_FORMAT_ATTR(wp_combine, CMN_CONFIG_WP_COMBINE),
+	CMN_FORMAT_ATTR(CMN_ANY, wp_dev_sel, CMN_CONFIG_WP_DEV_SEL),
+	CMN_FORMAT_ATTR(CMN_ANY, wp_chn_sel, CMN_CONFIG_WP_CHN_SEL),
+	CMN_FORMAT_ATTR(CMN_ANY, wp_grp, CMN_CONFIG_WP_GRP),
+	CMN_FORMAT_ATTR(CMN_ANY, wp_exclusive, CMN_CONFIG_WP_EXCLUSIVE),
+	CMN_FORMAT_ATTR(CMN_ANY, wp_combine, CMN_CONFIG_WP_COMBINE),
 
-	_CMN_FORMAT_ATTR(wp_val, 1, CMN_CONFIG1_WP_VAL),
-	_CMN_FORMAT_ATTR(wp_mask, 2, CMN_CONFIG2_WP_MASK),
+	_CMN_FORMAT_ATTR(CMN_ANY, wp_val, 1, CMN_CONFIG1_WP_VAL),
+	_CMN_FORMAT_ATTR(CMN_ANY, wp_mask, 2, CMN_CONFIG2_WP_MASK),
 
 	NULL
 };
@@ -1295,6 +1311,7 @@ static struct attribute *arm_cmn_format_attrs[] = {
 static const struct attribute_group arm_cmn_format_attrs_group = {
 	.name = "format",
 	.attrs = arm_cmn_format_attrs,
+	.is_visible = arm_cmn_format_attr_is_visible,
 };
 
 static ssize_t arm_cmn_cpumask_show(struct device *dev,
-- 
2.40.1