linux-kernel - Re: [PATCH v2 12/15] powerpc/85xx: add time base sync support for e6500

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Date:	Tue, 23 Apr 2013 19:04:06 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Zhao Chenhui <chenhui.zhao@...escale.com>
CC:	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 12/15] powerpc/85xx: add time base sync support for
 e6500

On 04/19/2013 05:47:45 AM, Zhao Chenhui wrote:
> From: Chen-Hui Zhao <chenhui.zhao@...escale.com>
> 
> For e6500, two threads in one core share one time base. Just need
> to do time base sync on first thread of one core, and skip it on
> the other thread.
> 
> Signed-off-by: Zhao Chenhui <chenhui.zhao@...escale.com>
> Signed-off-by: Li Yang <leoli@...escale.com>
> Signed-off-by: Andy Fleming <afleming@...escale.com>
> ---
>  arch/powerpc/platforms/85xx/smp.c |   52  
> +++++++++++++++++++++++++++++++-----
>  1 files changed, 44 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/85xx/smp.c  
> b/arch/powerpc/platforms/85xx/smp.c
> index 74d8cde..5f3eee3 100644
> --- a/arch/powerpc/platforms/85xx/smp.c
> +++ b/arch/powerpc/platforms/85xx/smp.c
> @@ -26,6 +26,7 @@
>  #include <asm/cacheflush.h>
>  #include <asm/dbell.h>
>  #include <asm/fsl_guts.h>
> +#include <asm/cputhreads.h>
> 
>  #include <sysdev/fsl_soc.h>
>  #include <sysdev/mpic.h>
> @@ -45,6 +46,7 @@ static u64 timebase;
>  static int tb_req;
>  static int tb_valid;
>  static u32 cur_booting_core;
> +static bool rcpmv2;
> 
>  #ifdef CONFIG_PPC_E500MC
>  /* get a physical mask of online cores and booting core */
> @@ -53,26 +55,40 @@ static inline u32 get_phy_cpu_mask(void)
>  	u32 mask;
>  	int cpu;
> 
> -	mask = 1 << cur_booting_core;
> -	for_each_online_cpu(cpu)
> -		mask |= 1 << get_hard_smp_processor_id(cpu);
> +	if (smt_capable()) {
> +		/* two threads in one core share one time base */
> +		mask = 1 << cpu_core_index_of_thread(cur_booting_core);
> +		for_each_online_cpu(cpu)
> +			mask |= 1 << cpu_core_index_of_thread(
> +					get_hard_smp_processor_id(cpu));
> +	} else {
> +		mask = 1 << cur_booting_core;
> +		for_each_online_cpu(cpu)
> +			mask |= 1 << get_hard_smp_processor_id(cpu);
> +	}

Where is smt_capable defined()?  I assume somewhere in the patchset but  
it's a pain to search 12 patches...

Is this really about whether we're SMT-capable or whether we have rcpm  
v2?

-Scott
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