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ARM: add IPI tracepoints

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The strings used to list IPIs in /proc/interrupts are reused for tracing
purposes.

While at it, prevent a negative ipinr from escaping the range check
in handle_IPI().

Link: http://lkml.kernel.org/p/1406318733-26754-4-git-send-email-nicolas.pitre@linaro.org

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Nicolas Pitre 2014-07-25 16:05:31 -04:00 committed by Steven Rostedt
parent f6d9804d14
commit 365ec7b173
1 changed files with 42 additions and 28 deletions
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70
arch/arm/kernel/smp.c
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@ -47,6 +47,9 @@
#include <asm/mach/arch.h>
#include <asm/mpu.h>
#define CREATE_TRACE_POINTS
#include <trace/events/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
@ -430,38 +433,15 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
}
}
static void (*smp_cross_call)(const struct cpumask *, unsigned int);
static void (*__smp_cross_call)(const struct cpumask *, unsigned int);
void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int))
{
if (!smp_cross_call)
smp_cross_call = fn;
if (!__smp_cross_call)
__smp_cross_call = fn;
}
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
smp_cross_call(mask, IPI_CALL_FUNC);
}
void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
{
smp_cross_call(mask, IPI_WAKEUP);
}
void arch_send_call_function_single_ipi(int cpu)
{
smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
}
#ifdef CONFIG_IRQ_WORK
void arch_irq_work_raise(void)
{
if (is_smp())
smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
}
#endif
static const char *ipi_types[NR_IPI] = {
static const char *ipi_types[NR_IPI] __tracepoint_string = {
#define S(x,s) [x] = s
S(IPI_WAKEUP, "CPU wakeup interrupts"),
S(IPI_TIMER, "Timer broadcast interrupts"),
@ -473,6 +453,12 @@ static const char *ipi_types[NR_IPI] = {
S(IPI_COMPLETION, "completion interrupts"),
};
static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
{
trace_ipi_raise(target, ipi_types[ipinr]);
__smp_cross_call(target, ipinr);
}
void show_ipi_list(struct seq_file *p, int prec)
{
unsigned int cpu, i;
@ -499,6 +485,29 @@ u64 smp_irq_stat_cpu(unsigned int cpu)
return sum;
}
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
smp_cross_call(mask, IPI_CALL_FUNC);
}
void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
{
smp_cross_call(mask, IPI_WAKEUP);
}
void arch_send_call_function_single_ipi(int cpu)
{
smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
}
#ifdef CONFIG_IRQ_WORK
void arch_irq_work_raise(void)
{
if (is_smp())
smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
}
#endif
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
void tick_broadcast(const struct cpumask *mask)
{
@ -556,8 +565,10 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
unsigned int cpu = smp_processor_id();
struct pt_regs *old_regs = set_irq_regs(regs);
if (ipinr < NR_IPI)
if ((unsigned)ipinr < NR_IPI) {
trace_ipi_entry(ipi_types[ipinr]);
__inc_irq_stat(cpu, ipi_irqs[ipinr]);
}
switch (ipinr) {
case IPI_WAKEUP:
@ -612,6 +623,9 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
cpu, ipinr);
break;
}
if ((unsigned)ipinr < NR_IPI)
trace_ipi_exit(ipi_types[ipinr]);
set_irq_regs(old_regs);
}