From: Michael Ellerman <mpe@ellerman.id.au>
To: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
maddy@linux.vnet.ibm.com, anju@linux.vnet.ibm.com
Subject: Re: [PATCH v2] powerpc/kernel/sysfs: Export ldbar spr to sysfs
Date: Wed, 01 Nov 2017 11:50:04 +1100 [thread overview]
Message-ID: <87h8ue960z.fsf@concordia.ellerman.id.au> (raw)
In-Reply-To: <1509466547-761-1-git-send-email-anju@linux.vnet.ibm.com>
Anju T Sudhakar <anju@linux.vnet.ibm.com> writes:
> Add ldbar spr to sysfs. The spr will hold thread level In-Memory Collection (IMC)
> counter configuration data.
This is missing any justification for why we would want to expose this,
and in particular why we would make it *writable*.
cheers
> 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, 0600, 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);
>
> --
> 2.7.4
next prev parent reply other threads:[~2017-11-01 0:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-31 16:15 [PATCH v2] powerpc/kernel/sysfs: Export ldbar spr to sysfs Anju T Sudhakar
2017-11-01 0:50 ` Michael Ellerman [this message]
2017-11-07 12:06 ` Anju T Sudhakar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87h8ue960z.fsf@concordia.ellerman.id.au \
--to=mpe@ellerman.id.au \
--cc=anju@linux.vnet.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=maddy@linux.vnet.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).