[PATCH 2/2] perf/imx_ddr: Dump AXI ID filter info to userspace

From: Joakim Zhang <qiangqing.zhang@nxp.com>
To: "will@kernel.org" <will@kernel.org>,
	"mark.rutland@arm.com" <mark.rutland@arm.com>,
	"robin.murphy@arm.com" <robin.murphy@arm.com>
Cc: Frank Li <frank.li@nxp.com>, dl-linux-imx <linux-imx@nxp.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	Joakim Zhang <qiangqing.zhang@nxp.com>
Subject: [PATCH 2/2] perf/imx_ddr: Dump AXI ID filter info to userspace
Date: Mon, 4 Nov 2019 07:09:24 +0000	[thread overview]
Message-ID: <20191104070616.29834-2-qiangqing.zhang@nxp.com> (raw)
In-Reply-To: <20191104070616.29834-1-qiangqing.zhang@nxp.com>

caps/filter indicates whether HW supports AXI ID filter or not.
caps/enhanced_filter indicates whether HW supports enhanced AXI ID filter
or not.

Users can check filter features from userspace with these attributions.

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
---
 drivers/perf/fsl_imx8_ddr_perf.c | 59 ++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c
index 3bbf806209a6..6db484251950 100644
--- a/drivers/perf/fsl_imx8_ddr_perf.c
+++ b/drivers/perf/fsl_imx8_ddr_perf.c
@@ -84,6 +84,64 @@ struct ddr_pmu {
 	int id;
 };
 
+enum ddr_perf_filter_capabilities {
+	PERF_CAP_AXI_ID_FILTER = 0,
+	PERF_CAP_AXI_ID_FILTER_ENHANCED,
+	PERF_CAP_AXI_ID_FEAT_MAX,
+};
+
+static int ddr_perf_filter_feat_caps[PERF_CAP_AXI_ID_FEAT_MAX] = {
+	[PERF_CAP_AXI_ID_FILTER] = DDR_CAP_AXI_ID_FILTER,
+	[PERF_CAP_AXI_ID_FILTER_ENHANCED] = DDR_CAP_AXI_ID_FILTER_ENHANCED,
+};
+
+static u32 ddr_perf_filter_cap_get(struct ddr_pmu *pmu, int cap)
+{
+	switch (cap) {
+	case PERF_CAP_AXI_ID_FILTER:
+		return !!(pmu->devtype_data->quirks);
+	case PERF_CAP_AXI_ID_FILTER_ENHANCED:
+		return (pmu->devtype_data->quirks ==
+			ddr_perf_filter_feat_caps[cap]);
+	}
+
+	WARN(1, "unknown filter cap %d\n", cap);
+
+	return 0;
+}
+
+static ssize_t ddr_perf_filter_cap_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct ddr_pmu *pmu = dev_get_drvdata(dev);
+	struct dev_ext_attribute *ea =
+		container_of(attr, struct dev_ext_attribute, attr);
+	int cap = (long)ea->var;
+
+	return snprintf(buf, PAGE_SIZE, "%u\n",
+			ddr_perf_filter_cap_get(pmu, cap));
+}
+
+#define PERF_EXT_ATTR_ENTRY(_name, _func, _var)				\
+	(&((struct dev_ext_attribute[]) {				\
+		{ __ATTR(_name, 0444, _func, NULL), (void *)_var }	\
+	})[0].attr.attr)
+
+#define PERF_FILTER_EXT_ATTR_ENTRY(_name, _var)				\
+	PERF_EXT_ATTR_ENTRY(_name, ddr_perf_filter_cap_show, _var)
+
+static struct attribute *ddr_perf_filter_cap_attr[] = {
+	PERF_FILTER_EXT_ATTR_ENTRY(filter, PERF_CAP_AXI_ID_FILTER),
+	PERF_FILTER_EXT_ATTR_ENTRY(enhanced_filter, PERF_CAP_AXI_ID_FILTER_ENHANCED),
+	NULL,
+};
+
+static struct attribute_group ddr_perf_filter_cap_attr_group = {
+	.name = "caps",
+	.attrs = ddr_perf_filter_cap_attr,
+};
+
 static ssize_t ddr_perf_cpumask_show(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
@@ -181,6 +239,7 @@ static const struct attribute_group *attr_groups[] = {
 	&ddr_perf_events_attr_group,
 	&ddr_perf_format_attr_group,
 	&ddr_perf_cpumask_attr_group,
+	&ddr_perf_filter_cap_attr_group,
 	NULL,
 };
 
-- 
2.17.1


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