[PATCH v4 04/10] coresight: etm-perf: update to handle configuration selection

Mike Leach mike.leach at linaro.org
Thu Jan 28 12:09:30 EST 2021


Loaded coresight configurations are registered in the cs_etm\cs_config sub
directory. This extends the etm-perf code to handle these registrations,
and the cs_syscfg driver to perform the registration on load.

Signed-off-by: Mike Leach <mike.leach at linaro.org>
---
 .../hwtracing/coresight/coresight-config.h    |   5 +-
 .../hwtracing/coresight/coresight-etm-perf.c  | 164 +++++++++++++++---
 .../hwtracing/coresight/coresight-etm-perf.h  |   8 +
 .../hwtracing/coresight/coresight-syscfg.c    |  13 +-
 4 files changed, 166 insertions(+), 24 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-config.h b/drivers/hwtracing/coresight/coresight-config.h
index 9d66e0071f38..98380b496046 100644
--- a/drivers/hwtracing/coresight/coresight-config.h
+++ b/drivers/hwtracing/coresight/coresight-config.h
@@ -154,7 +154,8 @@ struct cscfg_config_feat_ref {
  * @nr_presets:	Number of sets of presets supplied by this configuration.
  * @nr_total_params: Sum of all parameters declared by used features
  * @presets:	Array of preset values.
- *
+ * @id_ea:	Extended attribute for perf configid value
+ * @event_ea:	Extended attribute for perf event value
  */
 struct cscfg_config_desc {
 	const char *name;
@@ -165,6 +166,8 @@ struct cscfg_config_desc {
 	int nr_presets;
 	int nr_total_params;
 	const u64 *presets; /* nr_presets * nr_total_params */
+	struct dev_ext_attribute *id_ea;
+	struct dev_ext_attribute *event_ea;
 };
 
 /**
diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
index a608081bd446..e270bb1e0f7d 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.c
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
@@ -18,8 +18,10 @@
 #include <linux/types.h>
 #include <linux/workqueue.h>
 
+#include "coresight-config.h"
 #include "coresight-etm-perf.h"
 #include "coresight-priv.h"
+#include "coresight-syscfg.h"
 
 static struct pmu etm_pmu;
 static bool etm_perf_up;
@@ -32,8 +34,13 @@ PMU_FORMAT_ATTR(cycacc,		"config:" __stringify(ETM_OPT_CYCACC));
 PMU_FORMAT_ATTR(contextid,	"config:" __stringify(ETM_OPT_CTXTID));
 PMU_FORMAT_ATTR(timestamp,	"config:" __stringify(ETM_OPT_TS));
 PMU_FORMAT_ATTR(retstack,	"config:" __stringify(ETM_OPT_RETSTK));
+/* preset - if sink ID is used as a configuration selector */
+PMU_FORMAT_ATTR(preset,		"config:0-3");
 /* Sink ID - same for all ETMs */
 PMU_FORMAT_ATTR(sinkid,		"config2:0-31");
+/* config ID - set if a system configuration is selected */
+PMU_FORMAT_ATTR(configid,	"config2:32-63");
+
 
 static struct attribute *etm_config_formats_attr[] = {
 	&format_attr_cycacc.attr,
@@ -41,6 +48,8 @@ static struct attribute *etm_config_formats_attr[] = {
 	&format_attr_timestamp.attr,
 	&format_attr_retstack.attr,
 	&format_attr_sinkid.attr,
+	&format_attr_preset.attr,
+	&format_attr_configid.attr,
 	NULL,
 };
 
@@ -58,9 +67,29 @@ static const struct attribute_group etm_pmu_sinks_group = {
 	.attrs  = etm_config_sinks_attr,
 };
 
+static struct attribute *etm_config_cscfg_attr[] = {
+	NULL,
+};
+
+static const struct attribute_group etm_pmu_cscfg_group = {
+	.name   = "configurations",
+	.attrs  = etm_config_cscfg_attr,
+};
+
+static struct attribute *etm_config_events_attr[] = {
+	NULL,
+};
+
+static const struct attribute_group etm_pmu_events_group = {
+	.name   = "events",
+	.attrs  = etm_config_events_attr,
+};
+
 static const struct attribute_group *etm_pmu_attr_groups[] = {
 	&etm_pmu_format_group,
 	&etm_pmu_sinks_group,
+	&etm_pmu_cscfg_group,
+	&etm_pmu_events_group,
 	NULL,
 };
 
@@ -219,7 +248,7 @@ 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) {
+	if (event->attr.config2 & GENMASK_ULL(31, 0)) {
 		id = (u32)event->attr.config2;
 		sink = coresight_get_sink_by_id(id);
 	}
@@ -537,21 +566,17 @@ static ssize_t etm_perf_sink_name_show(struct device *dev,
 	return scnprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)(ea->var));
 }
 
-int etm_perf_add_symlink_sink(struct coresight_device *csdev)
+int etm_perf_add_symlink_group(struct device *dev,
+			       struct dev_ext_attribute **ext_attr,
+			       const char *name,
+			       const char *group_name)
 {
-	int ret;
+	struct dev_ext_attribute *ea;
 	unsigned long hash;
-	const char *name;
+	int ret;
 	struct device *pmu_dev = etm_pmu.dev;
-	struct device *dev = &csdev->dev;
-	struct dev_ext_attribute *ea;
 
-	if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
-	    csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
-		return -EINVAL;
-
-	if (csdev->ea != NULL)
-		return -EINVAL;
+	*ext_attr = NULL;
 
 	if (!etm_perf_up)
 		return -EPROBE_DEFER;
@@ -560,7 +585,6 @@ int etm_perf_add_symlink_sink(struct coresight_device *csdev)
 	if (!ea)
 		return -ENOMEM;
 
-	name = dev_name(dev);
 	/* See function coresight_get_sink_by_id() to know where this is used */
 	hash = hashlen_hash(hashlen_string(NULL, name));
 
@@ -574,31 +598,127 @@ int etm_perf_add_symlink_sink(struct coresight_device *csdev)
 	ea->var = (unsigned long *)hash;
 
 	ret = sysfs_add_file_to_group(&pmu_dev->kobj,
-				      &ea->attr.attr, "sinks");
-
+				      &ea->attr.attr, group_name);
 	if (!ret)
-		csdev->ea = ea;
-
+		*ext_attr = ea;
 	return ret;
 }
 
-void etm_perf_del_symlink_sink(struct coresight_device *csdev)
+int etm_perf_add_symlink_sink(struct coresight_device *csdev)
+{
+	const char *name;
+	struct device *dev = &csdev->dev;
+
+	if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
+	    csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
+		return -EINVAL;
+
+	if (csdev->ea != NULL)
+		return -EINVAL;
+
+	name = dev_name(dev);
+	return etm_perf_add_symlink_group(dev, &csdev->ea, name, "sinks");
+}
+
+void etm_perf_del_symlink_group(struct dev_ext_attribute *ea, const char *group_name)
 {
 	struct device *pmu_dev = etm_pmu.dev;
-	struct dev_ext_attribute *ea = csdev->ea;
 
+	sysfs_remove_file_from_group(&pmu_dev->kobj,
+				     &ea->attr.attr, group_name);
+}
+
+void etm_perf_del_symlink_sink(struct coresight_device *csdev)
+{
 	if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
 	    csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
 		return;
 
-	if (!ea)
+	if (!csdev->ea)
 		return;
 
-	sysfs_remove_file_from_group(&pmu_dev->kobj,
-				     &ea->attr.attr, "sinks");
+	etm_perf_del_symlink_group(csdev->ea, "sinks");
 	csdev->ea = NULL;
 }
 
+/* string to contain the attribute value */
+#define CSCFG_EVENT_STR_SIZE	32
+
+static ssize_t etm_perf_cscfg_event_show(struct device *dev,
+					 struct device_attribute *dattr,
+					 char *buf)
+{
+	struct dev_ext_attribute *ea;
+
+	ea = container_of(dattr, struct dev_ext_attribute, attr);
+	return scnprintf(buf, PAGE_SIZE, "%s\n", (const char *)(ea->var));
+}
+
+static int etm_perf_add_cscfg_event(struct device *dev, struct cscfg_config_desc *cs_cfg)
+{
+	struct dev_ext_attribute *ea;
+	unsigned long hash;
+	int ret;
+	struct device *pmu_dev = etm_pmu.dev;
+
+	ea = devm_kzalloc(dev, sizeof(*ea), GFP_KERNEL);
+	if (!ea)
+		return -ENOMEM;
+
+	hash = (unsigned long)cs_cfg->id_ea->var;
+
+	sysfs_attr_init(&ea->attr.attr);
+	ea->attr.attr.name = devm_kstrdup(dev, cs_cfg->name, GFP_KERNEL);
+	if (!ea->attr.attr.name)
+		return -ENOMEM;
+
+	/*
+	 * attribute value is "configid=<hash>".
+	 * this will be what perf evaluates when the config name is used
+	 * on the command line.
+	 */
+	ea->var = devm_kzalloc(dev, CSCFG_EVENT_STR_SIZE, GFP_KERNEL);
+	if (!ea->var)
+		return -ENOMEM;
+
+	scnprintf(ea->var, CSCFG_EVENT_STR_SIZE, "configid=0x%lx", hash);
+	ea->attr.attr.mode = 0444;
+	ea->attr.show = etm_perf_cscfg_event_show;
+
+	ret = sysfs_add_file_to_group(&pmu_dev->kobj,
+				      &ea->attr.attr, "events");
+	if (!ret)
+		cs_cfg->event_ea = ea;
+	return ret;
+}
+
+int etm_perf_add_symlink_cscfg(struct device *dev, struct cscfg_config_desc *cs_cfg)
+{
+	int err;
+
+	if (cs_cfg->id_ea != NULL)
+		return 0;
+
+	err = etm_perf_add_symlink_group(dev, &cs_cfg->id_ea,
+					 cs_cfg->name, "configurations");
+
+	if (!err)
+		err = etm_perf_add_cscfg_event(dev, cs_cfg);
+
+	return err;
+}
+
+void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *cs_cfg)
+{
+	if (!cs_cfg->id_ea)
+		return;
+
+	etm_perf_del_symlink_group(cs_cfg->id_ea, "configurations");
+	etm_perf_del_symlink_group(cs_cfg->event_ea, "events");
+	cs_cfg->id_ea = NULL;
+	cs_cfg->event_ea = NULL;
+}
+
 int __init etm_perf_init(void)
 {
 	int ret;
diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.h b/drivers/hwtracing/coresight/coresight-etm-perf.h
index 29d90dfeba31..3646a3837a0b 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.h
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.h
@@ -11,6 +11,7 @@
 #include "coresight-priv.h"
 
 struct coresight_device;
+struct cscfg_config_desc;
 
 /*
  * In both ETMv3 and v4 the maximum number of address comparator implentable
@@ -69,6 +70,9 @@ static inline void *etm_perf_sink_config(struct perf_output_handle *handle)
 		return data->snk_config;
 	return NULL;
 }
+int etm_perf_add_symlink_cscfg(struct device *dev,
+			       struct cscfg_config_desc *cscfg_desc);
+void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *cscfg_desc);
 #else
 static inline int etm_perf_symlink(struct coresight_device *csdev, bool link)
 { return -EINVAL; }
@@ -79,6 +83,10 @@ static inline void *etm_perf_sink_config(struct perf_output_handle *handle)
 {
 	return NULL;
 }
+int etm_perf_add_symlink_cscfg(struct device *dev,
+			       struct cscfg_config_desc *cscfg_desc)
+{ return -EINVAL; }
+void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *cscfg_desc) {}
 
 #endif /* CONFIG_CORESIGHT */
 
diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c
index 4b8e4e35e3e7..a070f135eca3 100644
--- a/drivers/hwtracing/coresight/coresight-syscfg.c
+++ b/drivers/hwtracing/coresight/coresight-syscfg.c
@@ -7,6 +7,7 @@
 #include <linux/platform_device.h>
 
 #include "coresight-config.h"
+#include "coresight-etm-perf.h"
 #include "coresight-syscfg.h"
 
 /*
@@ -100,6 +101,7 @@ static int cscfg_add_csdev_cfg(struct coresight_device *csdev,
 			dev_cfg->feats[dev_cfg->nr_feat++] = feat;
 		}
 	}
+
 	/* if matched features, add config to device.*/
 	if (dev_cfg) {
 		mutex_lock(&cscfg_csdev_mutex);
@@ -290,8 +292,12 @@ static int cscfg_load_config(struct cscfg_config_desc *cfg_desc)
 	if (err)
 		return err;
 
-	list_add(&cfg_desc->item, &cscfg_mgr->data.config_desc_list);
+	/* add config to perf fs to allow selection */
+	err = etm_perf_add_symlink_cscfg(to_device_cscfg(), cfg_desc);
+	if (err)
+		return err;
 
+	list_add(&cfg_desc->item, &cscfg_mgr->data.config_desc_list);
 	return 0;
 }
 
@@ -517,7 +523,12 @@ int cscfg_create_device(void)
 
 void cscfg_clear_device(void)
 {
+	struct cscfg_config_desc *cfg_desc;
+
 	mutex_lock(&cscfg_mutex);
+	list_for_each_entry(cfg_desc, &cscfg_mgr->data.config_desc_list, item) {
+		etm_perf_del_symlink_cscfg(cfg_desc);
+	}
 	device_unregister(to_device_cscfg());
 	mutex_unlock(&cscfg_mutex);
 }
-- 
2.17.1




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