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From: Steven Rostedt <rostedt@goodmis.org>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>,
	Ingo Molnar <mingo@redhat.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linaro-kernel@lists.linaro.org
Subject: Re: [PATCH v2 3/5] ARM: add IPI tracepoints
Date: Wed, 6 Aug 2014 15:51:06 -0400	[thread overview]
Message-ID: <20140806155106.138201e7@gandalf.local.home> (raw)
In-Reply-To: <1406318733-26754-4-git-send-email-nicolas.pitre@linaro.org>

Russell,

Can you give me your Acked-by for this, and I can pull it through my
tree?

Thanks,

-- Steve


On Fri, 25 Jul 2014 16:05:31 -0400
Nicolas Pitre <nicolas.pitre@linaro.org> 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>
> ---
>  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);
>  }
>  


WARNING: multiple messages have this Message-ID
From: rostedt@goodmis.org (Steven Rostedt)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 3/5] ARM: add IPI tracepoints
Date: Wed, 6 Aug 2014 15:51:06 -0400	[thread overview]
Message-ID: <20140806155106.138201e7@gandalf.local.home> (raw)
In-Reply-To: <1406318733-26754-4-git-send-email-nicolas.pitre@linaro.org>

Russell,

Can you give me your Acked-by for this, and I can pull it through my
tree?

Thanks,

-- Steve


On Fri, 25 Jul 2014 16:05:31 -0400
Nicolas Pitre <nicolas.pitre@linaro.org> 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>
> ---
>  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);
>  }
>  

  parent reply	other threads:[~2014-08-06 19:51 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-25 20:05 [PATCH v2 0/5] generic IPI tracing Nicolas Pitre
2014-07-25 20:05 ` Nicolas Pitre
2014-07-25 20:05 ` [PATCH v2 1/5] tracing: Do not do anything special with tracepoint_string when tracing is disabled Nicolas Pitre
2014-07-25 20:05   ` Nicolas Pitre
2014-08-08  2:35   ` Steven Rostedt
2014-08-08  2:35     ` Steven Rostedt
2014-08-08  3:05     ` Nicolas Pitre
2014-08-08  3:05       ` Nicolas Pitre
2014-07-25 20:05 ` [PATCH v2 2/5] tracepoint: add generic tracepoint definitions for IPI tracing Nicolas Pitre
2014-07-25 20:05   ` Nicolas Pitre
2014-07-25 20:05 ` [PATCH v2 3/5] ARM: add IPI tracepoints Nicolas Pitre
2014-07-25 20:05   ` Nicolas Pitre
2014-07-28  5:34   ` Daniel Lezcano
2014-07-28  5:34     ` Daniel Lezcano
2014-08-06 19:51   ` Steven Rostedt [this message]
2014-08-06 19:51     ` Steven Rostedt
2014-07-25 20:05 ` [PATCH v2 4/5] ARM64: " Nicolas Pitre
2014-07-25 20:05   ` Nicolas Pitre
2014-08-06 19:52   ` Steven Rostedt
2014-08-06 19:52     ` Steven Rostedt
2014-08-06 20:28     ` Nicolas Pitre
2014-08-06 20:28       ` Nicolas Pitre
2014-08-07  9:18     ` Will Deacon
2014-08-07  9:18       ` Will Deacon
2014-08-07 15:18       ` Steven Rostedt
2014-08-07 15:18         ` Steven Rostedt
2014-07-25 20:05 ` [PATCH v2 5/5] X86: " Nicolas Pitre
2014-07-25 20:05   ` Nicolas Pitre
2014-08-07 15:33   ` Steven Rostedt
2014-08-07 15:33     ` Steven Rostedt

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