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49e62e0d96
It is currently fairly difficult to follow what clk_rate_request are issued, and how they have been modified once done. Indeed, there's multiple paths that can be taken, some functions are recursive and will just forward the request to its parent, etc. Adding a lot of debug prints is just not very convenient, so let's add trace events for the clock requests, one before they are submitted and one after they are returned. That way we can simply toggle the tracing on without modifying the kernel code and without affecting performances or the kernel logs too much. Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://lore.kernel.org/r/20221018-clk-rate-request-tracing-v2-2-5170b363c413@cerno.tech Signed-off-by: Stephen Boyd <sboyd@kernel.org>
313 lines
6.2 KiB
C
313 lines
6.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
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*/
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM clk
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#if !defined(_TRACE_CLK_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_CLK_H
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#include <linux/tracepoint.h>
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struct clk_core;
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DECLARE_EVENT_CLASS(clk,
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TP_PROTO(struct clk_core *core),
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TP_ARGS(core),
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TP_STRUCT__entry(
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__string( name, core->name )
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),
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TP_fast_assign(
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__assign_str(name, core->name);
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),
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TP_printk("%s", __get_str(name))
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);
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DEFINE_EVENT(clk, clk_enable,
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TP_PROTO(struct clk_core *core),
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TP_ARGS(core)
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);
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DEFINE_EVENT(clk, clk_enable_complete,
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TP_PROTO(struct clk_core *core),
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TP_ARGS(core)
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);
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DEFINE_EVENT(clk, clk_disable,
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TP_PROTO(struct clk_core *core),
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TP_ARGS(core)
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);
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DEFINE_EVENT(clk, clk_disable_complete,
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TP_PROTO(struct clk_core *core),
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TP_ARGS(core)
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);
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DEFINE_EVENT(clk, clk_prepare,
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TP_PROTO(struct clk_core *core),
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TP_ARGS(core)
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);
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DEFINE_EVENT(clk, clk_prepare_complete,
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TP_PROTO(struct clk_core *core),
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TP_ARGS(core)
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);
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DEFINE_EVENT(clk, clk_unprepare,
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TP_PROTO(struct clk_core *core),
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TP_ARGS(core)
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);
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DEFINE_EVENT(clk, clk_unprepare_complete,
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TP_PROTO(struct clk_core *core),
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TP_ARGS(core)
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);
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DECLARE_EVENT_CLASS(clk_rate,
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TP_PROTO(struct clk_core *core, unsigned long rate),
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TP_ARGS(core, rate),
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TP_STRUCT__entry(
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__string( name, core->name )
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__field(unsigned long, rate )
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),
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TP_fast_assign(
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__assign_str(name, core->name);
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__entry->rate = rate;
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),
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TP_printk("%s %lu", __get_str(name), (unsigned long)__entry->rate)
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);
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DEFINE_EVENT(clk_rate, clk_set_rate,
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TP_PROTO(struct clk_core *core, unsigned long rate),
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TP_ARGS(core, rate)
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);
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DEFINE_EVENT(clk_rate, clk_set_rate_complete,
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TP_PROTO(struct clk_core *core, unsigned long rate),
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TP_ARGS(core, rate)
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);
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DEFINE_EVENT(clk_rate, clk_set_min_rate,
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TP_PROTO(struct clk_core *core, unsigned long rate),
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TP_ARGS(core, rate)
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);
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DEFINE_EVENT(clk_rate, clk_set_max_rate,
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TP_PROTO(struct clk_core *core, unsigned long rate),
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TP_ARGS(core, rate)
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);
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DECLARE_EVENT_CLASS(clk_rate_range,
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TP_PROTO(struct clk_core *core, unsigned long min, unsigned long max),
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TP_ARGS(core, min, max),
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TP_STRUCT__entry(
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__string( name, core->name )
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__field(unsigned long, min )
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__field(unsigned long, max )
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),
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TP_fast_assign(
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__assign_str(name, core->name);
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__entry->min = min;
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__entry->max = max;
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),
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TP_printk("%s min %lu max %lu", __get_str(name),
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(unsigned long)__entry->min,
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(unsigned long)__entry->max)
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);
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DEFINE_EVENT(clk_rate_range, clk_set_rate_range,
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TP_PROTO(struct clk_core *core, unsigned long min, unsigned long max),
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TP_ARGS(core, min, max)
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);
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DECLARE_EVENT_CLASS(clk_parent,
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TP_PROTO(struct clk_core *core, struct clk_core *parent),
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TP_ARGS(core, parent),
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TP_STRUCT__entry(
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__string( name, core->name )
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__string( pname, parent ? parent->name : "none" )
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),
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TP_fast_assign(
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__assign_str(name, core->name);
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__assign_str(pname, parent ? parent->name : "none");
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),
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TP_printk("%s %s", __get_str(name), __get_str(pname))
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);
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DEFINE_EVENT(clk_parent, clk_set_parent,
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TP_PROTO(struct clk_core *core, struct clk_core *parent),
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TP_ARGS(core, parent)
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);
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DEFINE_EVENT(clk_parent, clk_set_parent_complete,
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TP_PROTO(struct clk_core *core, struct clk_core *parent),
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TP_ARGS(core, parent)
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);
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DECLARE_EVENT_CLASS(clk_phase,
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TP_PROTO(struct clk_core *core, int phase),
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TP_ARGS(core, phase),
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TP_STRUCT__entry(
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__string( name, core->name )
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__field( int, phase )
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),
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TP_fast_assign(
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__assign_str(name, core->name);
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__entry->phase = phase;
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),
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TP_printk("%s %d", __get_str(name), (int)__entry->phase)
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);
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DEFINE_EVENT(clk_phase, clk_set_phase,
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TP_PROTO(struct clk_core *core, int phase),
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TP_ARGS(core, phase)
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);
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DEFINE_EVENT(clk_phase, clk_set_phase_complete,
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TP_PROTO(struct clk_core *core, int phase),
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TP_ARGS(core, phase)
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);
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DECLARE_EVENT_CLASS(clk_duty_cycle,
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TP_PROTO(struct clk_core *core, struct clk_duty *duty),
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TP_ARGS(core, duty),
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TP_STRUCT__entry(
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__string( name, core->name )
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__field( unsigned int, num )
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__field( unsigned int, den )
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),
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TP_fast_assign(
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__assign_str(name, core->name);
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__entry->num = duty->num;
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__entry->den = duty->den;
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),
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TP_printk("%s %u/%u", __get_str(name), (unsigned int)__entry->num,
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(unsigned int)__entry->den)
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);
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DEFINE_EVENT(clk_duty_cycle, clk_set_duty_cycle,
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TP_PROTO(struct clk_core *core, struct clk_duty *duty),
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TP_ARGS(core, duty)
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);
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DEFINE_EVENT(clk_duty_cycle, clk_set_duty_cycle_complete,
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TP_PROTO(struct clk_core *core, struct clk_duty *duty),
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TP_ARGS(core, duty)
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);
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DECLARE_EVENT_CLASS(clk_rate_request,
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TP_PROTO(struct clk_rate_request *req),
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TP_ARGS(req),
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TP_STRUCT__entry(
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__string( name, req->core ? req->core->name : "none")
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__string( pname, req->best_parent_hw ? clk_hw_get_name(req->best_parent_hw) : "none" )
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__field(unsigned long, min )
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__field(unsigned long, max )
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__field(unsigned long, prate )
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),
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TP_fast_assign(
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__assign_str(name, req->core ? req->core->name : "none");
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__assign_str(pname, req->best_parent_hw ? clk_hw_get_name(req->best_parent_hw) : "none");
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__entry->min = req->min_rate;
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__entry->max = req->max_rate;
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__entry->prate = req->best_parent_rate;
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),
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TP_printk("%s min %lu max %lu, parent %s (%lu)", __get_str(name),
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(unsigned long)__entry->min,
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(unsigned long)__entry->max,
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__get_str(pname),
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(unsigned long)__entry->prate)
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);
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DEFINE_EVENT(clk_rate_request, clk_rate_request_start,
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TP_PROTO(struct clk_rate_request *req),
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TP_ARGS(req)
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);
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DEFINE_EVENT(clk_rate_request, clk_rate_request_done,
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TP_PROTO(struct clk_rate_request *req),
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TP_ARGS(req)
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);
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#endif /* _TRACE_CLK_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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