Messages in this thread | | | Date | Mon, 28 Jul 2014 07:34:50 +0200 | From | Daniel Lezcano <> | Subject | Re: [PATCH v2 3/5] ARM: add IPI tracepoints |
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On 07/25/2014 10:05 PM, Nicolas Pitre wrote: > 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(). > > Signed-off-by: Nicolas Pitre <nico@linaro.org> > Acked-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> --- > arch/arm/kernel/smp.c | 70 ++++++++++++++++++++++++++++++--------------------- > 1 file changed, 42 insertions(+), 28 deletions(-) > > diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c > index 7c4fada440..9388a3d479 100644 > --- a/arch/arm/kernel/smp.c > +++ b/arch/arm/kernel/smp.c > @@ -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; > -} > - > -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); > + if (!__smp_cross_call) > + __smp_cross_call = fn; > } > > -#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); > } > >
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