[PATCH v6 04/10] coresight: etm-perf: update to handle configuration selection
Mike Leach
mike.leach at linaro.org
Fri Apr 9 11:37:16 BST 2021
Loaded coresight configurations are registered in the cs_etm\events 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>
Reviewed-by: Mathieu Poirier <mathieu.poirier at linaro.org>
---
.../hwtracing/coresight/coresight-config.h | 2 +
.../hwtracing/coresight/coresight-etm-perf.c | 134 ++++++++++++++----
.../hwtracing/coresight/coresight-etm-perf.h | 8 ++
.../hwtracing/coresight/coresight-syscfg.c | 11 ++
4 files changed, 127 insertions(+), 28 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-config.h b/drivers/hwtracing/coresight/coresight-config.h
index 5a39cbbc38a4..0667581822c1 100644
--- a/drivers/hwtracing/coresight/coresight-config.h
+++ b/drivers/hwtracing/coresight/coresight-config.h
@@ -126,6 +126,7 @@ struct cscfg_feature_desc {
* @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.
+ * @event_ea: Extended attribute for perf event value
*
*/
struct cscfg_config_desc {
@@ -137,6 +138,7 @@ struct cscfg_config_desc {
int nr_presets;
int nr_total_params;
const u64 *presets; /* nr_presets * nr_total_params */
+ 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 15310c72f89f..26b4bca156aa 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;
@@ -57,8 +59,13 @@ PMU_FORMAT_ATTR(contextid1, "config:" __stringify(ETM_OPT_CTXTID));
PMU_FORMAT_ATTR(contextid2, "config:" __stringify(ETM_OPT_CTXTID2));
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");
+
/*
* contextid always traces the "PID". The PID is in CONTEXTIDR_EL1
@@ -88,6 +95,8 @@ 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,
};
@@ -105,9 +114,19 @@ static const struct attribute_group etm_pmu_sinks_group = {
.attrs = etm_config_sinks_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_events_group,
NULL,
};
@@ -286,7 +305,7 @@ 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 = user_sink = coresight_get_sink_by_id(id);
}
@@ -658,68 +677,127 @@ 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)
+static struct dev_ext_attribute *
+etm_perf_add_symlink_group(struct device *dev, 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;
if (!etm_perf_up)
- return -EPROBE_DEFER;
+ return ERR_PTR(-EPROBE_DEFER);
ea = devm_kzalloc(dev, sizeof(*ea), GFP_KERNEL);
if (!ea)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
- name = dev_name(dev);
- /* See function coresight_get_sink_by_id() to know where this is used */
+ /*
+ * If this function is called adding a sink then the hash is used for
+ * sink selection - see function coresight_get_sink_by_id().
+ * If adding a configuration then the hash is used for selection in
+ * cscfg_activate_config()
+ */
hash = hashlen_hash(hashlen_string(NULL, name));
sysfs_attr_init(&ea->attr.attr);
ea->attr.attr.name = devm_kstrdup(dev, name, GFP_KERNEL);
if (!ea->attr.attr.name)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
ea->attr.attr.mode = 0444;
- ea->attr.show = etm_perf_sink_name_show;
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;
+ return ret ? ERR_PTR(ret) : ea;
+}
- return ret;
+int etm_perf_add_symlink_sink(struct coresight_device *csdev)
+{
+ const char *name;
+ struct device *dev = &csdev->dev;
+ int err = 0;
+
+ 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);
+ csdev->ea = etm_perf_add_symlink_group(dev, name, "sinks");
+ if (IS_ERR(csdev->ea)) {
+ err = PTR_ERR(csdev->ea);
+ csdev->ea = NULL;
+ } else
+ csdev->ea->attr.show = etm_perf_sink_name_show;
+
+ return err;
}
-void etm_perf_del_symlink_sink(struct coresight_device *csdev)
+static 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;
}
+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, "configid=0x%lx\n", (unsigned long)(ea->var));
+}
+
+int etm_perf_add_symlink_cscfg(struct device *dev, struct cscfg_config_desc *config_desc)
+{
+ int err = 0;
+
+ if (config_desc->event_ea != NULL)
+ return 0;
+
+ config_desc->event_ea = etm_perf_add_symlink_group(dev, config_desc->name, "events");
+
+ /* set the show function to the custom cscfg event */
+ if (!IS_ERR(config_desc->event_ea))
+ config_desc->event_ea->attr.show = etm_perf_cscfg_event_show;
+ else {
+ err = PTR_ERR(config_desc->event_ea);
+ config_desc->event_ea = NULL;
+ }
+
+ return err;
+}
+
+void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *config_desc)
+{
+ if (!config_desc->event_ea)
+ return;
+
+ etm_perf_del_symlink_group(config_desc->event_ea, "events");
+ config_desc->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..ba617fe2217e 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 *config_desc);
+void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *config_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 *config_desc)
+{ return -EINVAL; }
+void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *config_desc) {}
#endif /* CONFIG_CORESIGHT */
diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c
index c7f48d6b48f5..e35f8c0ac2f8 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"
/*
@@ -276,6 +277,11 @@ static int cscfg_load_config(struct cscfg_config_desc *config_desc)
if (err)
return err;
+ /* add config to perf fs to allow selection */
+ err = etm_perf_add_symlink_cscfg(cscfg_device(), config_desc);
+ if (err)
+ return err;
+
list_add(&config_desc->item, &cscfg_mgr->config_desc_list);
return 0;
}
@@ -508,7 +514,12 @@ static int cscfg_create_device(void)
static void cscfg_clear_device(void)
{
+ struct cscfg_config_desc *cfg_desc;
+
mutex_lock(&cscfg_mutex);
+ list_for_each_entry(cfg_desc, &cscfg_mgr->config_desc_list, item) {
+ etm_perf_del_symlink_cscfg(cfg_desc);
+ }
device_unregister(cscfg_device());
mutex_unlock(&cscfg_mutex);
}
--
2.17.1
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