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arm: ipi raise/start/end tracing

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Add tracepoints for IPI raise events, and start and end of the
ipi handler.

Used to inspect the source of CPU wake-ups which are not already
traced - all other reasons for a CPU to wake-up are already
covered.

Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Jon Medhurst <tixy@linaro.org>
This commit is contained in:
Chris Redpath
2013-10-11 11:45:00 +01:00
committed by Jon Medhurst
parent 7b8e0b3f2a
commit 2353c1f800
3 changed files with 109 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/arm/kernel/smp.c
View File

@@ -46,6 +46,9 @@
#include <asm/virt.h>
#include <asm/mach/arch.h>
#define CREATE_TRACE_POINTS
#include <trace/events/arm-ipi.h>
/*
* as from 2.5, kernels no longer have an init_tasks structure
* so we need some other way of telling a new secondary core
@@ -604,6 +607,7 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
if (ipinr < NR_IPI)
__inc_irq_stat(cpu, ipi_irqs[ipinr]);
trace_arm_ipi_entry(ipinr);
switch (ipinr) {
case IPI_WAKEUP:
break;
@@ -643,6 +647,7 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
cpu, ipinr);
break;
}
trace_arm_ipi_exit(ipinr);
set_irq_regs(old_regs);
}

5
drivers/irqchip/irq-gic.c
View File

@@ -41,6 +41,7 @@
#include <linux/slab.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqchip/arm-gic.h>
#include <trace/events/arm-ipi.h>
#include <asm/irq.h>
#include <asm/exception.h>
@@ -649,8 +650,10 @@ void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
unsigned long map = 0;
/* Convert our logical CPU mask into a physical one. */
for_each_cpu(cpu, mask)
for_each_cpu(cpu, mask) {
trace_arm_ipi_send(irq, cpu);
map |= gic_cpu_map[cpu];
}
/*
* Ensure that stores to Normal memory are visible to the

100
include/trace/events/arm-ipi.h Normal file
View File

@@ -0,0 +1,100 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM arm-ipi
#if !defined(_TRACE_ARM_IPI_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_ARM_IPI_H
#include <linux/tracepoint.h>
#define show_arm_ipi_name(val) \
__print_symbolic(val, \
{ 0, "IPI_WAKEUP" }, \
{ 1, "IPI_TIMER" }, \
{ 2, "IPI_RESCHEDULE" }, \
{ 3, "IPI_CALL_FUNC" }, \
{ 4, "IPI_CALL_FUNC_SINGLE" }, \
{ 5, "IPI_CPU_STOP" }, \
{ 6, "IPI_COMPLETION" }, \
{ 7, "IPI_CPU_BACKTRACE" })
DECLARE_EVENT_CLASS(arm_ipi,
TP_PROTO(unsigned int ipi_nr),
TP_ARGS(ipi_nr),
TP_STRUCT__entry(
__field( unsigned int, ipi )
),
TP_fast_assign(
__entry->ipi = ipi_nr;
),
TP_printk("ipi=%u [action=%s]", __entry->ipi,
show_arm_ipi_name(__entry->ipi))
);
/**
* arm_ipi_entry - called in the arm-generic ipi handler immediately before
* entering ipi-type handler
* @ipi_nr: ipi number
*
* When used in combination with the arm_ipi_exit tracepoint
* we can determine the ipi handler runtine.
*/
DEFINE_EVENT(arm_ipi, arm_ipi_entry,
TP_PROTO(unsigned int ipi_nr),
TP_ARGS(ipi_nr)
);
/**
* arm_ipi_exit - called in the arm-generic ipi handler immediately
* after the ipi-type handler returns
* @ipi_nr: ipi number
*
* When used in combination with the arm_ipi_entry tracepoint
* we can determine the ipi handler runtine.
*/
DEFINE_EVENT(arm_ipi, arm_ipi_exit,
TP_PROTO(unsigned int ipi_nr),
TP_ARGS(ipi_nr)
);
/**
* arm_ipi_send - called as the ipi target mask is built, immediately
* before the register is written
* @ipi_nr: ipi number
* @dest: cpu to send to
*
* When used in combination with the arm_ipi_entry tracepoint
* we can determine the ipi raise to run latency.
*/
TRACE_EVENT(arm_ipi_send,
TP_PROTO(unsigned int ipi_nr, int dest),
TP_ARGS(ipi_nr, dest),
TP_STRUCT__entry(
__field( unsigned int, ipi )
__field( int , dest )
),
TP_fast_assign(
__entry->ipi = ipi_nr;
__entry->dest = dest;
),
TP_printk("dest=%d ipi=%u [action=%s]", __entry->dest,
__entry->ipi, show_arm_ipi_name(__entry->ipi))
);
#endif /* _TRACE_ARM_IPI_H */
/* This part must be outside protection */
#include <trace/define_trace.h>