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Message-ID: <20150225204436.421.33930@quantum>
Date: Wed, 25 Feb 2015 12:44:36 -0800
From: Mike Turquette <mturquette@...aro.org>
To: Stephen Boyd <sboyd@...eaurora.org>,
"Stephen Boyd" <sboyd@...eaurora.org>
Cc: linux-kernel@...r.kernel.org,
"Steven Rostedt" <rostedt@...dmis.org>
Subject: Re: [PATCH v2] clk: Add tracepoints for hardware operations
Quoting Stephen Boyd (2015-02-02 14:37:41)
> 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 <rostedt@...dmis.org>
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
Applied to clk-next.
Thanks,
Mike
> ---
>
> Changes since v1:
> * Fixed missing trace_*_complete() tracepoints
>
> Note this is based on another patch titled "clk: Missing
> set_phase op is an error"
>
> drivers/clk/clk.c | 56 ++++++++++---
> include/trace/events/clk.h | 198 +++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 244 insertions(+), 10 deletions(-)
> create mode 100644 include/trace/events/clk.h
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 670c8c86ce9f..3ffadce9a0c2 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);
> }
>
> @@ -901,12 +911,16 @@ static int clk_core_prepare(struct clk_core *clk)
> if (ret)
> return ret;
>
> - if (clk->ops->prepare) {
> + trace_clk_prepare(clk);
> +
> + if (clk->ops->prepare)
> ret = clk->ops->prepare(clk->hw);
> - if (ret) {
> - clk_core_unprepare(clk->parent);
> - return ret;
> - }
> +
> + trace_clk_prepare_complete(clk);
> +
> + if (ret) {
> + clk_core_unprepare(clk->parent);
> + return ret;
> }
> }
>
> @@ -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);
> }
>
> @@ -1008,12 +1026,16 @@ static int clk_core_enable(struct clk_core *clk)
> if (ret)
> return ret;
>
> - if (clk->ops->enable) {
> + trace_clk_enable(clk);
> +
> + if (clk->ops->enable)
> ret = clk->ops->enable(clk->hw);
> - if (ret) {
> - clk_core_disable(clk->parent);
> - return ret;
> - }
> +
> + trace_clk_enable_complete(clk);
> +
> + if (ret) {
> + clk_core_disable(clk->parent);
> + return ret;
> }
> }
>
> @@ -1438,10 +1460,14 @@ static int __clk_set_parent(struct clk_core *clk, struct clk_core *parent,
>
> old_parent = __clk_set_parent_before(clk, parent);
>
> + trace_clk_set_parent(clk, parent);
> +
> /* change clock input source */
> if (parent && clk->ops->set_parent)
> ret = clk->ops->set_parent(clk->hw, p_index);
>
> + trace_clk_set_parent_complete(clk, parent);
> +
> if (ret) {
> flags = clk_enable_lock();
> clk_reparent(clk, old_parent);
> @@ -1665,6 +1691,7 @@ static void clk_change_rate(struct clk_core *clk)
>
> if (clk->new_parent && clk->new_parent != clk->parent) {
> old_parent = __clk_set_parent_before(clk, clk->new_parent);
> + trace_clk_set_parent(clk, clk->new_parent);
>
> if (clk->ops->set_rate_and_parent) {
> skip_set_rate = true;
> @@ -1675,12 +1702,17 @@ static void clk_change_rate(struct clk_core *clk)
> clk->ops->set_parent(clk->hw, clk->new_parent_index);
> }
>
> + trace_clk_set_parent_complete(clk, clk->new_parent);
> __clk_set_parent_after(clk, clk->new_parent, old_parent);
> }
>
> + trace_clk_set_rate(clk, clk->new_rate);
> +
> 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)
> @@ -2083,9 +2115,13 @@ 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)
> ret = clk->core->ops->set_phase(clk->core->hw, degrees);
>
> + trace_clk_set_phase_complete(clk->core, degrees);
> +
> if (!ret)
> clk->core->phase = degrees;
>
> 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>
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
--
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