It's useful to have tracepoints around operations that change the
hardware state so that we can debug clock hardware performance
and operations. Four basic types of events are supported: on/off
events for enable, disable, prepare, unprepare that only record
an event and a clock name, rate changing events for
clk_set_{min_,max_}rate{_range}(), phase changing events for
clk_set_phase() and parent changing events for clk_set_parent().
Cc: Steven Rostedt <rost...@goodmis.org>
Signed-off-by: Stephen Boyd <sb...@codeaurora.org>
---
drivers/clk/clk.c | 32 ++++++++
include/trace/events/clk.h | 198 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 230 insertions(+)
create mode 100644 include/trace/events/clk.h
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index a29daf9edea4..271c3fe71277 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -22,6 +22,9 @@
#include <linux/init.h>
#include <linux/sched.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/clk.h>
+
#include "clk.h"
static DEFINE_SPINLOCK(enable_lock);
@@ -448,10 +451,12 @@ static void clk_unprepare_unused_subtree(struct clk_core
*clk)
return;
if (clk_core_is_prepared(clk)) {
+ trace_clk_unprepare(clk);
if (clk->ops->unprepare_unused)
clk->ops->unprepare_unused(clk->hw);
else if (clk->ops->unprepare)
clk->ops->unprepare(clk->hw);
+ trace_clk_unprepare_complete(clk);
}
}
@@ -478,10 +483,12 @@ static void clk_disable_unused_subtree(struct clk_core
*clk)
* back to .disable
*/
if (clk_core_is_enabled(clk)) {
+ trace_clk_disable(clk);
if (clk->ops->disable_unused)
clk->ops->disable_unused(clk->hw);
else if (clk->ops->disable)
clk->ops->disable(clk->hw);
+ trace_clk_disable_complete(clk);
}
unlock_out:
@@ -861,9 +868,12 @@ static void clk_core_unprepare(struct clk_core *clk)
WARN_ON(clk->enable_count > 0);
+ trace_clk_unprepare(clk);
+
if (clk->ops->unprepare)
clk->ops->unprepare(clk->hw);
+ trace_clk_unprepare_complete(clk);
clk_core_unprepare(clk->parent);
}
@@ -901,6 +911,8 @@ static int clk_core_prepare(struct clk_core *clk)
if (ret)
return ret;
+ trace_clk_prepare(clk);
+
if (clk->ops->prepare) {
ret = clk->ops->prepare(clk->hw);
if (ret) {
@@ -908,6 +920,8 @@ static int clk_core_prepare(struct clk_core *clk)
return ret;
}
}
+
+ trace_clk_prepare_complete(clk);
}
clk->prepare_count++;
@@ -953,9 +967,13 @@ static void clk_core_disable(struct clk_core *clk)
if (--clk->enable_count > 0)
return;
+ trace_clk_disable(clk);
+
if (clk->ops->disable)
clk->ops->disable(clk->hw);
+ trace_clk_disable_complete(clk);
+
clk_core_disable(clk->parent);
}
@@ -1008,6 +1026,7 @@ static int clk_core_enable(struct clk_core *clk)
if (ret)
return ret;
+ trace_clk_enable(clk);
if (clk->ops->enable) {
ret = clk->ops->enable(clk->hw);
if (ret) {
@@ -1015,6 +1034,7 @@ static int clk_core_enable(struct clk_core *clk)
return ret;
}
}
+ trace_clk_enable_complete(clk);
}
clk->enable_count++;
@@ -1383,6 +1403,8 @@ static struct clk_core *__clk_set_parent_before(struct
clk_core *clk,
unsigned long flags;
struct clk_core *old_parent = clk->parent;
+ trace_clk_set_parent(clk, parent);
+
/*
* Migrate prepare state between parents and prevent race with
* clk_enable().
@@ -1427,6 +1449,8 @@ static void __clk_set_parent_after(struct clk_core *core,
clk_core_disable(old_parent);
clk_core_unprepare(old_parent);
}
+
+ trace_clk_set_parent_complete(core, parent);
}
static int __clk_set_parent(struct clk_core *clk, struct clk_core *parent,
@@ -1663,6 +1687,8 @@ static void clk_change_rate(struct clk_core *clk)
else if (clk->parent)
best_parent_rate = clk->parent->rate;
+ trace_clk_set_rate(clk, clk->new_rate);
+
if (clk->new_parent && clk->new_parent != clk->parent) {
old_parent = __clk_set_parent_before(clk, clk->new_parent);
@@ -1681,6 +1707,8 @@ static void clk_change_rate(struct clk_core *clk)
if (!skip_set_rate && clk->ops->set_rate)
clk->ops->set_rate(clk->hw, clk->new_rate, best_parent_rate);
+ trace_clk_set_rate_complete(clk, clk->new_rate);
+
clk->rate = clk_recalc(clk, best_parent_rate);
if (clk->notifier_count && old_rate != clk->rate)
@@ -2081,6 +2109,8 @@ int clk_set_phase(struct clk *clk, int degrees)
clk_prepare_lock();
+ trace_clk_set_phase(clk->core, degrees);
+
if (!clk->core->ops->set_phase)
goto out_unlock;
@@ -2090,6 +2120,8 @@ int clk_set_phase(struct clk *clk, int degrees)
clk->core->phase = degrees;
out_unlock:
+ trace_clk_set_phase_complete(clk->core, degrees);
+
clk_prepare_unlock();
out:
diff --git a/include/trace/events/clk.h b/include/trace/events/clk.h
new file mode 100644
index 000000000000..758607226bfd
--- /dev/null
+++ b/include/trace/events/clk.h
@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM clk
+
+#if !defined(_TRACE_CLK_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_CLK_H
+
+#include <linux/tracepoint.h>
+
+struct clk_core;
+
+DECLARE_EVENT_CLASS(clk,
+
+ TP_PROTO(struct clk_core *core),
+
+ TP_ARGS(core),
+
+ TP_STRUCT__entry(
+ __string( name, core->name )
+ ),
+
+ TP_fast_assign(
+ __assign_str(name, core->name);
+ ),
+
+ TP_printk("%s", __get_str(name))
+);
+
+DEFINE_EVENT(clk, clk_enable,
+
+ TP_PROTO(struct clk_core *core),
+
+ TP_ARGS(core)
+);
+
+DEFINE_EVENT(clk, clk_enable_complete,
+
+ TP_PROTO(struct clk_core *core),
+
+ TP_ARGS(core)
+);
+
+DEFINE_EVENT(clk, clk_disable,
+
+ TP_PROTO(struct clk_core *core),
+
+ TP_ARGS(core)
+);
+
+DEFINE_EVENT(clk, clk_disable_complete,
+
+ TP_PROTO(struct clk_core *core),
+
+ TP_ARGS(core)
+);
+
+DEFINE_EVENT(clk, clk_prepare,
+
+ TP_PROTO(struct clk_core *core),
+
+ TP_ARGS(core)
+);
+
+DEFINE_EVENT(clk, clk_prepare_complete,
+
+ TP_PROTO(struct clk_core *core),
+
+ TP_ARGS(core)
+);
+
+DEFINE_EVENT(clk, clk_unprepare,
+
+ TP_PROTO(struct clk_core *core),
+
+ TP_ARGS(core)
+);
+
+DEFINE_EVENT(clk, clk_unprepare_complete,
+
+ TP_PROTO(struct clk_core *core),
+
+ TP_ARGS(core)
+);
+
+DECLARE_EVENT_CLASS(clk_rate,
+
+ TP_PROTO(struct clk_core *core, unsigned long rate),
+
+ TP_ARGS(core, rate),
+
+ TP_STRUCT__entry(
+ __string( name, core->name )
+ __field(unsigned long, rate )
+ ),
+
+ TP_fast_assign(
+ __assign_str(name, core->name);
+ __entry->rate = rate;
+ ),
+
+ TP_printk("%s %lu", __get_str(name), (unsigned long)__entry->rate)
+);
+
+DEFINE_EVENT(clk_rate, clk_set_rate,
+
+ TP_PROTO(struct clk_core *core, unsigned long rate),
+
+ TP_ARGS(core, rate)
+);
+
+DEFINE_EVENT(clk_rate, clk_set_rate_complete,
+
+ TP_PROTO(struct clk_core *core, unsigned long rate),
+
+ TP_ARGS(core, rate)
+);
+
+DECLARE_EVENT_CLASS(clk_parent,
+
+ TP_PROTO(struct clk_core *core, struct clk_core *parent),
+
+ TP_ARGS(core, parent),
+
+ TP_STRUCT__entry(
+ __string( name, core->name )
+ __string( pname, parent->name )
+ ),
+
+ TP_fast_assign(
+ __assign_str(name, core->name);
+ __assign_str(pname, parent->name);
+ ),
+
+ TP_printk("%s %s", __get_str(name), __get_str(pname))
+);
+
+DEFINE_EVENT(clk_parent, clk_set_parent,
+
+ TP_PROTO(struct clk_core *core, struct clk_core *parent),
+
+ TP_ARGS(core, parent)
+);
+
+DEFINE_EVENT(clk_parent, clk_set_parent_complete,
+
+ TP_PROTO(struct clk_core *core, struct clk_core *parent),
+
+ TP_ARGS(core, parent)
+);
+
+DECLARE_EVENT_CLASS(clk_phase,
+
+ TP_PROTO(struct clk_core *core, int phase),
+
+ TP_ARGS(core, phase),
+
+ TP_STRUCT__entry(
+ __string( name, core->name )
+ __field( int, phase )
+ ),
+
+ TP_fast_assign(
+ __assign_str(name, core->name);
+ __entry->phase = phase;
+ ),
+
+ TP_printk("%s %d", __get_str(name), (int)__entry->phase)
+);
+
+DEFINE_EVENT(clk_phase, clk_set_phase,
+
+ TP_PROTO(struct clk_core *core, int phase),
+
+ TP_ARGS(core, phase)
+);
+
+DEFINE_EVENT(clk_phase, clk_set_phase_complete,
+
+ TP_PROTO(struct clk_core *core, int phase),
+
+ TP_ARGS(core, phase)
+);
+
+#endif /* _TRACE_CLK_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
--
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a Linux Foundation Collaborative Project
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