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authorAlex Elder <elder@linaro.org>2016-05-24 04:05:31 (GMT)
committerGreg Kroah-Hartman <gregkh@google.com>2016-05-27 05:37:19 (GMT)
commit5451ea0e99cb7d58cbf90c7785cb50cc322a4434 (patch)
treed2f234e099db0eeb91e426f8732e41776899ffb9 /drivers
parent1f79046bd73abf5cc1dc5ad1f817a7851496ae0c (diff)
downloadlinux-5451ea0e99cb7d58cbf90c7785cb50cc322a4434.tar.xz
greybus: tracing: add module traces
Define a new gb_module trace point event class, used to trace events associated with the module abstraction. Define four basic trace points for this--creation time, drop of last reference, before registring interfaces and after de-registering them. Signed-off-by: Alex Elder <elder@linaro.org> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/staging/greybus/greybus_trace.h53
-rw-r--r--drivers/staging/greybus/module.c9
2 files changed, 62 insertions, 0 deletions
diff --git a/drivers/staging/greybus/greybus_trace.h b/drivers/staging/greybus/greybus_trace.h
index cbbc959..ecf2253 100644
--- a/drivers/staging/greybus/greybus_trace.h
+++ b/drivers/staging/greybus/greybus_trace.h
@@ -156,6 +156,59 @@ DEFINE_OPERATION_EVENT(gb_operation_put_active);
#undef DEFINE_OPERATION_EVENT
+DECLARE_EVENT_CLASS(gb_module,
+
+ TP_PROTO(struct gb_module *module),
+
+ TP_ARGS(module),
+
+ TP_STRUCT__entry(
+ __field(int, hd_bus_id)
+ __field(u8, module_id)
+ __field(u8, num_interfaces)
+ __field(bool, disconnected)
+ ),
+
+ TP_fast_assign(
+ __entry->hd_bus_id = module->hd->bus_id;
+ __entry->module_id = module->module_id;
+ __entry->disconnected = module->disconnected;
+ ),
+
+ TP_printk("greybus: hd_bus_id=%d module_id=%hhu disconnected=%u",
+ __entry->hd_bus_id, __entry->module_id, __entry->disconnected)
+);
+
+#define DEFINE_MODULE_EVENT(name) \
+ DEFINE_EVENT(gb_module, name, \
+ TP_PROTO(struct gb_module *module), \
+ TP_ARGS(module))
+
+/*
+ * Occurs after a new module is successfully created, before
+ * creating any of its interfaces.
+ */
+DEFINE_MODULE_EVENT(gb_module_create);
+
+/*
+ * Occurs after the last reference to a module has been dropped.
+ */
+DEFINE_MODULE_EVENT(gb_module_release);
+
+/*
+ * Occurs after a module is successfully created, before registering
+ * any of its interfaces.
+ */
+DEFINE_MODULE_EVENT(gb_module_add);
+
+/*
+ * Occurs when a module is deleted, before deregistering its
+ * interfaces.
+ */
+DEFINE_MODULE_EVENT(gb_module_del);
+
+#undef DEFINE_MODULE_EVENT
+
DECLARE_EVENT_CLASS(gb_host_device,
TP_PROTO(struct gb_host_device *hd),
diff --git a/drivers/staging/greybus/module.c b/drivers/staging/greybus/module.c
index ea58954..c56b988 100644
--- a/drivers/staging/greybus/module.c
+++ b/drivers/staging/greybus/module.c
@@ -9,6 +9,7 @@
#include "greybus.h"
+#include "greybus_trace.h"
static ssize_t eject_store(struct device *dev,
struct device_attribute *attr,
@@ -77,6 +78,8 @@ static void gb_module_release(struct device *dev)
{
struct gb_module *module = to_gb_module(dev);
+ trace_gb_module_release(module);
+
kfree(module);
}
@@ -109,6 +112,8 @@ struct gb_module *gb_module_create(struct gb_host_device *hd, u8 module_id,
device_initialize(&module->dev);
dev_set_name(&module->dev, "%d-%u", hd->bus_id, module_id);
+ trace_gb_module_create(module);
+
for (i = 0; i < num_interfaces; ++i) {
intf = gb_interface_create(module, module_id + i);
if (!intf) {
@@ -215,6 +220,8 @@ int gb_module_add(struct gb_module *module)
return ret;
}
+ trace_gb_module_add(module);
+
for (i = 0; i < module->num_interfaces; ++i)
gb_module_register_interface(module->interfaces[i]);
@@ -229,6 +236,8 @@ void gb_module_del(struct gb_module *module)
for (i = 0; i < module->num_interfaces; ++i)
gb_module_deregister_interface(module->interfaces[i]);
+ trace_gb_module_del(module);
+
device_del(&module->dev);
}