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PM: cpufreq: powernv/tracing: Move powernv_throttle trace event

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As the trace event powernv_throttle is only used by the powernv code, move
it to a separate include file and have that code directly enable it.

Trace events can take up around 5K of memory when they are defined
regardless if they are used or not. It wastes memory to have them defined
in configurations where the tracepoint is not used.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/20250612145407.906308844@goodmis.org
Fixes: 0306e481d479a ("cpufreq: powernv/tracing: Add powernv_throttle tracepoint")
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2025-06-12 10:53:11 -04:00 committed by Steven Rostedt (Google)
parent 06cc77a63f
commit 647fe16b46
5 changed files with 48 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/cpufreq/Makefile
View File

@ -21,6 +21,7 @@ obj-$(CONFIG_CPUFREQ_VIRT) += virtual-cpufreq.o
# Traces
CFLAGS_amd-pstate-trace.o := -I$(src)
CFLAGS_powernv-cpufreq.o := -I$(src)
amd_pstate-y := amd-pstate.o amd-pstate-trace.o
##################################################################################

4
drivers/cpufreq/powernv-cpufreq.c
View File

@ -21,7 +21,6 @@
#include <linux/string_choices.h>
#include <linux/cpu.h>
#include <linux/hashtable.h>
#include <trace/events/power.h>
#include <asm/cputhreads.h>
#include <asm/firmware.h>
@ -30,6 +29,9 @@
#include <asm/opal.h>
#include <linux/timer.h>
#define CREATE_TRACE_POINTS
#include "powernv-trace.h"
#define POWERNV_MAX_PSTATES_ORDER 8
#define POWERNV_MAX_PSTATES (1UL << (POWERNV_MAX_PSTATES_ORDER))
#define PMSR_PSAFE_ENABLE (1UL << 30)

44
drivers/cpufreq/powernv-trace.h Normal file
View File

@ -0,0 +1,44 @@
/* SPDX-License-Identifier: GPL-2.0 */
#if !defined(_POWERNV_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
#define _POWERNV_TRACE_H
#include <linux/cpufreq.h>
#include <linux/tracepoint.h>
#include <linux/trace_events.h>
#undef TRACE_SYSTEM
#define TRACE_SYSTEM power
TRACE_EVENT(powernv_throttle,
TP_PROTO(int chip_id, const char *reason, int pmax),
TP_ARGS(chip_id, reason, pmax),
TP_STRUCT__entry(
__field(int, chip_id)
__string(reason, reason)
__field(int, pmax)
),
TP_fast_assign(
__entry->chip_id = chip_id;
__assign_str(reason);
__entry->pmax = pmax;
),
TP_printk("Chip %d Pmax %d %s", __entry->chip_id,
__entry->pmax, __get_str(reason))
);
#endif /* _POWERNV_TRACE_H */
/* This part must be outside protection */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH .
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE powernv-trace
#include <trace/define_trace.h>

22
include/trace/events/power.h
View File

@ -99,28 +99,6 @@ DEFINE_EVENT(psci_domain_idle, psci_domain_idle_exit,
TP_ARGS(cpu_id, state, s2idle)
);
TRACE_EVENT(powernv_throttle,
TP_PROTO(int chip_id, const char *reason, int pmax),
TP_ARGS(chip_id, reason, pmax),
TP_STRUCT__entry(
__field(int, chip_id)
__string(reason, reason)
__field(int, pmax)
),
TP_fast_assign(
__entry->chip_id = chip_id;
__assign_str(reason);
__entry->pmax = pmax;
),
TP_printk("Chip %d Pmax %d %s", __entry->chip_id,
__entry->pmax, __get_str(reason))
);
TRACE_EVENT(pstate_sample,
TP_PROTO(u32 core_busy,

1
kernel/trace/power-traces.c
View File

@ -17,5 +17,4 @@
EXPORT_TRACEPOINT_SYMBOL_GPL(suspend_resume);
EXPORT_TRACEPOINT_SYMBOL_GPL(cpu_idle);
EXPORT_TRACEPOINT_SYMBOL_GPL(cpu_frequency);
EXPORT_TRACEPOINT_SYMBOL_GPL(powernv_throttle);