linux-kernel - Re: [PATCH] add IRQ context simulation in mce-inject

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Message-ID: <4E76FFF9.9050308@linux.intel.com>
Date:	Mon, 19 Sep 2011 16:40:25 +0800
From:	Chen Gong <gong.chen@...ux.intel.com>
To:	"Chen, Gong" <gong.chen@...el.com>
CC:	"Kleen, Andi" <andi.kleen@...el.com>,
	"Huang, Ying" <ying.huang@...el.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] add IRQ context simulation in mce-inject

于 2011/9/19 16:34, Chen, Gong 写道:
> Current mce-inject can simulate some kinds of scenarios, such as
> one CPU working in process context, and other CPUs working in NMI
> context. To extend the coverage of test range, a new IRQ context
> for other CPUs is added.
>
> Signed-off-by: Chen Gong<gong.chen@...ux.intel.com>
> ---
>   arch/x86/include/asm/mce.h              |    1 +
>   arch/x86/kernel/cpu/mcheck/mce-inject.c |   34 +++++++++++++++++++++++++++---
>   2 files changed, 31 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
> index c9321f3..2490e8c 100644
> --- a/arch/x86/include/asm/mce.h
> +++ b/arch/x86/include/asm/mce.h
> @@ -54,6 +54,7 @@
>   #define MCJ_CTX_IRQ		2    /* inject context: IRQ */
>   #define MCJ_NMI_BROADCAST	4    /* do NMI broadcasting */
>   #define MCJ_EXCEPTION		8    /* raise as exception */
> +#define MCJ_IRQ_BRAODCAST	0x10 /* do IRQ broadcasting */
>
>   /* Fields are zero when not available */
>   struct mce {
> diff --git a/arch/x86/kernel/cpu/mcheck/mce-inject.c b/arch/x86/kernel/cpu/mcheck/mce-inject.c
> index 0ed633c..8f7a119 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce-inject.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce-inject.c
> @@ -17,6 +17,7 @@
>   #include<linux/kernel.h>
>   #include<linux/string.h>
>   #include<linux/fs.h>
> +#include<linux/preempt.h>
>   #include<linux/smp.h>
>   #include<linux/notifier.h>
>   #include<linux/kdebug.h>
> @@ -94,6 +95,18 @@ static int mce_raise_notify(struct notifier_block *self,
>   	return NOTIFY_STOP;
>   }
>
> +static void mce_irq_ipi(void *info)
> +{
> +	int cpu = smp_processor_id();
> +	struct mce *m =&__get_cpu_var(injectm);
> +
> +	if (cpumask_test_cpu(cpu, mce_inject_cpumask)&&
> +		m->inject_flags&  MCJ_EXCEPTION) {
> +		cpumask_clear_cpu(cpu, mce_inject_cpumask);
> +		raise_exception(m, NULL);
> +	}
> +}
> +
>   static struct notifier_block mce_raise_nb = {
>   	.notifier_call = mce_raise_notify,
>   	.priority = NMI_LOCAL_NORMAL_PRIOR,
> @@ -146,9 +159,10 @@ static void raise_mce(struct mce *m)
>   		return;
>
>   #ifdef CONFIG_X86_LOCAL_APIC
> -	if (m->inject_flags&  MCJ_NMI_BROADCAST) {
> +	if (m->inject_flags&  (MCJ_IRQ_BRAODCAST | MCJ_NMI_BROADCAST)) {
>   		unsigned long start;
>   		int cpu;
> +
>   		get_online_cpus();
>   		cpumask_copy(mce_inject_cpumask, cpu_online_mask);
>   		cpumask_clear_cpu(get_cpu(), mce_inject_cpumask);
> @@ -158,13 +172,25 @@ static void raise_mce(struct mce *m)
>   			    MCJ_CTX(mcpu->inject_flags) != MCJ_CTX_RANDOM)
>   				cpumask_clear_cpu(cpu, mce_inject_cpumask);
>   		}
> -		if (!cpumask_empty(mce_inject_cpumask))
> -			apic->send_IPI_mask(mce_inject_cpumask, NMI_VECTOR);
> +		if (!cpumask_empty(mce_inject_cpumask)) {
> +			if (m->inject_flags&  MCJ_IRQ_BRAODCAST) {
> +				/*
> +				 * don't wait because mce_irq_ipi is necessary
> +				 * to be sync with following raise_local
> +				 */
> +				preempt_disable();
> +				smp_call_function_many(mce_inject_cpumask,
> +					mce_irq_ipi, NULL, 0);
> +				preempt_enable();
> +			} else if (m->inject_flags&  MCJ_NMI_BROADCAST)
> +				apic->send_IPI_mask(mce_inject_cpumask,
> +						NMI_VECTOR);
> +		}
>   		start = jiffies;
>   		while (!cpumask_empty(mce_inject_cpumask)) {
>   			if (!time_before(jiffies, start + 2*HZ)) {
>   				printk(KERN_ERR
> -				"Timeout waiting for mce inject NMI %lx\n",
> +				"Timeout waiting for mce inject %lx\n",
>   					*cpumask_bits(mce_inject_cpumask));
>   				break;
>   			}
> -- 1.7.1
>
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My mailstop meets some trouble, please forgive me for sending this patch 
via outlook :-(

send
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