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greybus: tracing: add module traces

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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>
This commit is contained in:
Alex Elder 2016-05-23 23:05:31 -05:00 committed by Greg Kroah-Hartman
parent 1f79046bd7
commit 5451ea0e99
2 changed files with 62 additions and 0 deletions
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53
drivers/staging/greybus/greybus_trace.h
View file

@ -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),

9
drivers/staging/greybus/module.c
View file

@ -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);
}