linux-kernel - Re: [PATCH v3] powerpc/kernel/sysfs: Export ldbar spr to sysfs

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Date:   Thu, 9 Nov 2017 18:17:24 +0530
From:   Anju T Sudhakar <anju@...ux.vnet.ibm.com>
To:     mpe@...erman.id.au
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        maddy@...ux.vnet.ibm.com
Subject: Re: [PATCH v3] powerpc/kernel/sysfs: Export ldbar spr to sysfs

Hi,

Kindly ignore this patch, I send a wrong version. Will send out the 
right one.


Thanks,

Anju


On Thursday 09 November 2017 05:43 PM, Anju T Sudhakar wrote:
> Add ldbar spr to sysfs. The spr holds thread level In-Memory Collection (IMC)
> counter configuration data. Exposing this will help to understand the current
> configuration of thread-level counters in the system.
> Primarily, Bit 0 of ldbar says whether the counters are enabled or not.
> And bit 1 indicates the mode (if 0-Accumulation Mode/if 1-Trace Mode).
>
> Signed-off-by: Anju T Sudhakar <anju@...ux.vnet.ibm.com>
> ---
>   arch/powerpc/kernel/sysfs.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
>
> diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
> index 4437c70..f8caee0 100644
> --- a/arch/powerpc/kernel/sysfs.c
> +++ b/arch/powerpc/kernel/sysfs.c
> @@ -485,6 +485,7 @@ SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
>   SYSFS_SPRSETUP(purr, SPRN_PURR);
>   SYSFS_SPRSETUP(spurr, SPRN_SPURR);
>   SYSFS_SPRSETUP(pir, SPRN_PIR);
> +SYSFS_SPRSETUP(ldbar, SPRN_LDBAR);
>
>   /*
>     Lets only enable read for phyp resources and
> @@ -492,6 +493,7 @@ SYSFS_SPRSETUP(pir, SPRN_PIR);
>     Lets be conservative and default to pseries.
>   */
>   static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
> +static DEVICE_ATTR(ldbar, 0400, show_ldbar, store_ldbar);
>   static DEVICE_ATTR(spurr, 0400, show_spurr, NULL);
>   static DEVICE_ATTR(purr, 0400, show_purr, store_purr);
>   static DEVICE_ATTR(pir, 0400, show_pir, NULL);
> @@ -757,6 +759,9 @@ static int register_cpu_online(unsigned int cpu)
>   			device_create_file(s, &pmc_attrs[i]);
>
>   #ifdef CONFIG_PPC64
> +	if (cpu_has_feature(CPU_FTR_ARCH_300))
> +		device_create_file(s, &dev_attr_ldbar);
> +
>   	if (cpu_has_feature(CPU_FTR_MMCRA))
>   		device_create_file(s, &dev_attr_mmcra);
>
> @@ -842,6 +847,9 @@ static int unregister_cpu_online(unsigned int cpu)
>   			device_remove_file(s, &pmc_attrs[i]);
>
>   #ifdef CONFIG_PPC64
> +	if (cpu_has_feature(CPU_FTR_ARCH_300))
> +		device_remove_file(s, &dev_attr_ldbar);
> +
>   	if (cpu_has_feature(CPU_FTR_MMCRA))
>   		device_remove_file(s, &dev_attr_mmcra);
>