LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Michael Ellerman <mpe@ellerman.id.au>
To: Kajol Jain <kjain@linux.ibm.com>,
	acme@kernel.org, linuxppc-dev@lists.ozlabs.org,
	sukadev@linux.vnet.ibm.com
Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
	anju@linux.vnet.ibm.com, maddy@linux.vnet.ibm.com,
	ravi.bangoria@linux.ibm.com, peterz@infradead.org,
	yao.jin@linux.intel.com, ak@linux.intel.com, jolsa@kernel.org,
	kan.liang@linux.intel.com, jmario@redhat.com,
	alexander.shishkin@linux.intel.com, mingo@kernel.org,
	paulus@ozlabs.org, namhyung@kernel.org, mpetlan@redhat.com,
	gregkh@linuxfoundation.org, benh@kernel.crashing.org,
	mamatha4@linux.vnet.ibm.com, mark.rutland@arm.com,
	tglx@linutronix.de, kjain@linux.ibm.com
Subject: Re: [PATCH v7 5/5] powerpc/hv-24x7: Update post_mobility_fixup() to handle migration
Date: Wed, 29 Apr 2020 21:37:12 +1000
Message-ID: <877dxyfrpz.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <20200327063642.26175-6-kjain@linux.ibm.com>

Kajol Jain <kjain@linux.ibm.com> writes:
> Function 'read_sys_info_pseries()' is added to get system parameter
> values like number of sockets and chips per socket.
> and it gets these details via rtas_call with token
> "PROCESSOR_MODULE_INFO".
>
> Incase lpar migrate from one system to another, system
> parameter details like chips per sockets or number of sockets might
> change. So, it needs to be re-initialized otherwise, these values
> corresponds to previous system values.
> This patch adds a call to 'read_sys_info_pseries()' from
> 'post-mobility_fixup()' to re-init the physsockets and physchips values.
>
> Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
> ---
>  arch/powerpc/platforms/pseries/mobility.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c
> index b571285f6c14..226accd6218b 100644
> --- a/arch/powerpc/platforms/pseries/mobility.c
> +++ b/arch/powerpc/platforms/pseries/mobility.c
> @@ -371,6 +371,18 @@ void post_mobility_fixup(void)
>  	/* Possibly switch to a new RFI flush type */
>  	pseries_setup_rfi_flush();
>  
> +	/*
> +	 * Incase lpar migrate from one system to another, system

In case an LPAR migrates

> +	 * parameter details like chips per sockets and number of sockets
> +	 * might change. So, it needs to be re-initialized otherwise these
                             ^                                       ^
                             they need                               the
> +	 * values corresponds to previous system.
                  ^
                  will correspond to the

> +	 * Here, adding a call to read_sys_info_pseries() declared in

Adding is the wrong tense in a comment. When someone reads the comment
the code has already been added. Past tense would be right, but really
the comment shouldn't say what you did, it should say why.

> +	 * platforms/pseries/pseries.h to re-init the physsockets and
> +	 * physchips value.

Call read_sys_info_pseries() to reinitialise the values.

> +	 */
> +	if (IS_ENABLED(CONFIG_HV_PERF_CTRS) && IS_ENABLED(CONFIG_PPC_RTAS))
> +		read_sys_info_pseries();

The RTAS check is not needed. pseries always selects RTAS.

You shouldn't need the IS_ENABLED() check here though, do it with an
empty version in the header when CONFIG_HV_PERF_CTRS is not enabled.

cheers

  parent reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-27  6:36 [PATCH v7 0/5] powerpc/hv-24x7: Expose chip/sockets info to add json file metric support for the hv_24x7 socket/chip level events Kajol Jain
2020-03-27  6:36 ` [PATCH v7 1/5] powerpc/perf/hv-24x7: Fix inconsistent output values incase multiple hv-24x7 events run Kajol Jain
2020-04-29  8:56   ` Madhavan Srinivasan
2020-03-27  6:36 ` [PATCH v7 2/5] powerpc/hv-24x7: Add rtas call in hv-24x7 driver to get processor details Kajol Jain
2020-04-29  8:02   ` Madhavan Srinivasan
2020-04-29 11:31   ` Michael Ellerman
2020-05-06  9:53     ` kajoljain
2020-03-27  6:36 ` [PATCH v7 3/5] powerpc/hv-24x7: Add sysfs files inside hv-24x7 device to show " Kajol Jain
2020-04-29  9:08   ` Madhavan Srinivasan
2020-04-29 11:32   ` Michael Ellerman
2020-04-29 11:33     ` Michael Ellerman
2020-03-27  6:36 ` [PATCH v7 4/5] Documentation/ABI: Add ABI documentation for chips and sockets Kajol Jain
2020-03-27  6:36 ` [PATCH v7 5/5] powerpc/hv-24x7: Update post_mobility_fixup() to handle migration Kajol Jain
2020-04-29  9:10   ` Madhavan Srinivasan
2020-04-29 11:37   ` Michael Ellerman [this message]
2020-05-05  6:57     ` kajoljain
2020-05-05  7:05       ` Michael Ellerman

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=877dxyfrpz.fsf@mpe.ellerman.id.au \
    --to=mpe@ellerman.id.au \
    --cc=acme@kernel.org \
    --cc=ak@linux.intel.com \
    --cc=alexander.shishkin@linux.intel.com \
    --cc=anju@linux.vnet.ibm.com \
    --cc=benh@kernel.crashing.org \
    --cc=gregkh@linuxfoundation.org \
    --cc=jmario@redhat.com \
    --cc=jolsa@kernel.org \
    --cc=kan.liang@linux.intel.com \
    --cc=kjain@linux.ibm.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-perf-users@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=maddy@linux.vnet.ibm.com \
    --cc=mamatha4@linux.vnet.ibm.com \
    --cc=mark.rutland@arm.com \
    --cc=mingo@kernel.org \
    --cc=mpetlan@redhat.com \
    --cc=namhyung@kernel.org \
    --cc=paulus@ozlabs.org \
    --cc=peterz@infradead.org \
    --cc=ravi.bangoria@linux.ibm.com \
    --cc=sukadev@linux.vnet.ibm.com \
    --cc=tglx@linutronix.de \
    --cc=yao.jin@linux.intel.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

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lkml.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lkml.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lkml.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lkml.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lkml.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lkml.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lkml.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lkml.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lkml.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lkml.kernel.org/lkml/9 lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lkml.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git