linux-kernel - Re: [PATCH] sparc32: refactor smp boot

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Date:	Mon, 04 Jun 2012 12:18:12 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	"David S. Miller" <davem@...emloft.net>, tglx@...utronix.de,
	peterz@...radead.org, paulmck@...ux.vnet.ibm.com,
	rusty@...tcorp.com.au, mingo@...nel.org, yong.zhang0@...il.com,
	akpm@...ux-foundation.org, vatsa@...ux.vnet.ibm.com, rjw@...k.pl,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	nikunj@...ux.vnet.ibm.com, vapier@...too.org, konrad@...sler.com,
	tkhai@...dex.ru, sparclinux@...r.kernel.org
Subject: Re: [PATCH] sparc32: refactor smp boot

On 06/04/2012 02:47 AM, Sam Ravnborg wrote:

> From 531d9c538fc60c15363890768ea416897853d6af Mon Sep 17 00:00:00 2001
> From: Sam Ravnborg <sam@...nborg.org>
> Date: Sun, 3 Jun 2012 23:08:18 +0200
> Subject: [PATCH] sparc32: refactor smp boot
> 
> Introduce a common smp_callin() function to call
> from trampoline_32.S.
> Add platform specific functions to handle the
> platform details.
> 
> This is in preparation for a patch that will
> unify the smp boot stuff for all architectures.
> sparc32 was significantly different to warrant
> this patch in preparation.
> 
> Signed-off-by: Sam Ravnborg <sam@...nborg.org>
> ---
> 
> Hi Srivatsa.
> 
> This should address all your comemnts (thanks!).
> I assume you will include this patch in your serie.
> 


Of course, thanks for your work!

As soon as the Xen problem gets sorted out (patch 5), I will send out
a v2 including your patch and addressing all the comments received
so far.

> diff --git a/arch/sparc/kernel/sun4d_smp.c b/arch/sparc/kernel/sun4d_smp.c

> index ddaea31..c9eb82f 100644
> --- a/arch/sparc/kernel/sun4d_smp.c
> +++ b/arch/sparc/kernel/sun4d_smp.c
> @@ -50,10 +50,9 @@ static inline void show_leds(int cpuid)
>  			      "i" (ASI_M_CTL));
>  }
> 
> -void __cpuinit smp4d_callin(void)
> +void __cpuinit sun4d_cpu_pre_starting(void *arg)
>  {
>  	int cpuid = hard_smp_processor_id();
> -	unsigned long flags;
> 
>  	/* Show we are alive */
>  	cpu_leds[cpuid] = 0x6;
> @@ -61,26 +60,20 @@ void __cpuinit smp4d_callin(void)
> 
>  	/* Enable level15 interrupt, disable level14 interrupt for now */
>  	cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
> +}
> 
> -	local_ops->cache_all();
> -	local_ops->tlb_all();
> +void __cpuinit sun4d_cpu_pre_online(void *arg)
> +{
> +	unsigned long flags;
> +	int cpuid;
> 
> -	notify_cpu_starting(cpuid);
> -	/*
> -	 * Unblock the master CPU _only_ when the scheduler state
> +	cpuid = hard_smp_processor_id();
> +
> +	/* Unblock the master CPU _only_ when the scheduler state
>  	 * of all secondary CPUs will be up-to-date, so after
>  	 * the SMP initialization the master will be just allowed
>  	 * to call the scheduler code.
>  	 */


Looks like you forgot to update this comment.
Its ok, I'll update your patch and include it in the series.

Regards,
Srivatsa S. Bhat

> -	/* Get our local ticker going. */
> -	register_percpu_ce(cpuid);
> -
> -	calibrate_delay();
> -	smp_store_cpu_info(cpuid);
> -	local_ops->cache_all();
> -	local_ops->tlb_all();
> -
> -	/* Allow master to continue. */
>  	sun4d_swap((unsigned long *)&cpu_callin_map[cpuid], 1);
>  	local_ops->cache_all();
>  	local_ops->tlb_all();
> @@ -106,16 +99,12 @@ void __cpuinit smp4d_callin(void)
>  	local_ops->cache_all();
>  	local_ops->tlb_all();
> 
> -	local_irq_enable();	/* We don't allow PIL 14 yet */
> -
>  	while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
>  		barrier();
> 
>  	spin_lock_irqsave(&sun4d_imsk_lock, flags);
>  	cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
>  	spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
> -	set_cpu_online(cpuid, true);
> -
>  }
> 


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