From mboxrd@z Thu Jan  1 00:00:00 1970
From: tixy@linaro.org (Jon Medhurst (Tixy))
Date: Tue, 09 Apr 2013 18:28:43 +0100
Subject: [PATCH v4 15/15] ARM: vexpress: Select multi-cluster SMP
 operation if required
In-Reply-To: <alpine.LFD.2.03.1304090829590.1171@syhkavp.arg>
References: <1360041732-17936-1-git-send-email-nicolas.pitre@linaro.org>
 <1360041732-17936-16-git-send-email-nicolas.pitre@linaro.org>
 <20130405224819.GB14308@quad.lixom.net>
 <alpine.LFD.2.03.1304060943370.1171@syhkavp.arg>
 <1365412211.3384.16.camel@linaro1.home>
 <alpine.LFD.2.03.1304090135590.1171@syhkavp.arg>
 <1365487246.3292.3.camel@computer5.home>
 <alpine.LFD.2.03.1304090829590.1171@syhkavp.arg>
Message-ID: <1365528523.3434.105.camel@linaro1.home>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Tue, 2013-04-09 at 12:34 -0400, Nicolas Pitre wrote:
> On Tue, 9 Apr 2013, Jon Medhurst (Tixy) wrote:
> 
> > On Tue, 2013-04-09 at 01:41 -0400, Nicolas Pitre wrote:
> > > > Do the changes to the above mcpm files want to be in a separate patch as
> > > > it's generic ARM code, not vexpress specific?
> > > 
> > > Well, since it was so trivial I didn't do it, but the split might be a 
> > > good idea nevertheless.  So I inserted the following patch in the 
> > > series, and corresponding changes are now removed from the patch above.  
> > > What do you think?
> > 
> > Looks fine. 
> 
> May I add your ACK?

Yes,
Acked-by: Jon Medhurst <tixy@linaro.org>

> > Did you miss my other comment about smp_ops not looking like they were 
> > getting set in the case of mcpm_smp_set_ops not getting called?
> 
> You are right.  See my change to #14/15 to fix that.
> 
> The VExpress patch now becomes this (only change is the return value):
> 
> Author: Jon Medhurst <tixy@linaro.org>
> Date:   Wed Jan 30 09:12:55 2013 +0000
> 
>     ARM: vexpress: Select multi-cluster SMP operation if required
>     
>     Signed-off-by: Jon Medhurst <tixy@linaro.org>
>     Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
>     Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
>     Acked-by: Pawel Moll <pawel.moll@arm.com>
> 
> diff --git a/arch/arm/mach-vexpress/core.h b/arch/arm/mach-vexpress/core.h
> index f134cd4a85..bde4374ab6 100644
> --- a/arch/arm/mach-vexpress/core.h
> +++ b/arch/arm/mach-vexpress/core.h
> @@ -6,6 +6,8 @@
>  
>  void vexpress_dt_smp_map_io(void);
>  
> +bool vexpress_smp_init_ops(void);
> +
>  extern struct smp_operations	vexpress_smp_ops;
>  
>  extern void vexpress_cpu_die(unsigned int cpu);
> diff --git a/arch/arm/mach-vexpress/platsmp.c b/arch/arm/mach-vexpress/platsmp.c
> index dc1ace55d5..f31a7af712 100644
> --- a/arch/arm/mach-vexpress/platsmp.c
> +++ b/arch/arm/mach-vexpress/platsmp.c
> @@ -12,9 +12,11 @@
>  #include <linux/errno.h>
>  #include <linux/smp.h>
>  #include <linux/io.h>
> +#include <linux/of.h>
>  #include <linux/of_fdt.h>
>  #include <linux/vexpress.h>
>  
> +#include <asm/mcpm_entry.h>
>  #include <asm/smp_scu.h>
>  #include <asm/mach/map.h>
>  
> @@ -203,3 +205,21 @@ struct smp_operations __initdata vexpress_smp_ops = {
>  	.cpu_die		= vexpress_cpu_die,
>  #endif
>  };
> +
> +bool __init vexpress_smp_init_ops(void)
> +{
> +#ifdef CONFIG_MCPM
> +	/*
> +	 * The best way to detect a multi-cluster configuration at the moment
> +	 * is to look for the presence of a CCI in the system.
> +	 * Override the default vexpress_smp_ops if so.
> +	 */
> +	struct device_node *node;
> +	node = of_find_compatible_node(NULL, NULL, "arm,cci");
> +	if (node && of_device_is_available(node)) {
> +		mcpm_smp_set_ops();
> +		return true;
> +	}
> +#endif
> +	return false;
> +}
> diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c
> index 915683cb67..16b42c10e0 100644
> --- a/arch/arm/mach-vexpress/v2m.c
> +++ b/arch/arm/mach-vexpress/v2m.c
> @@ -476,6 +476,7 @@ static const char * const v2m_dt_match[] __initconst = {
>  DT_MACHINE_START(VEXPRESS_DT, "ARM-Versatile Express")
>  	.dt_compat	= v2m_dt_match,
>  	.smp		= smp_ops(vexpress_smp_ops),
> +	.smp_init	= smp_init_ops(vexpress_smp_init_ops),
>  	.map_io		= v2m_dt_map_io,
>  	.init_early	= v2m_dt_init_early,
>  	.init_irq	= irqchip_init,
> 
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