From: David Gibson <david@gibson.dropbear.id.au>
To: Daniel Henrique Barboza <danielhb413@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 2/2] hotplug-cpu.c: set UNISOLATE on dlpar_cpu_remove() failure
Date: Mon, 19 Apr 2021 14:02:18 +1000 [thread overview]
Message-ID: <YH0AyoAxLuLsWLUI@yekko.fritz.box> (raw)
In-Reply-To: <20210416210216.380291-3-danielhb413@gmail.com>
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On Fri, Apr 16, 2021 at 06:02:16PM -0300, Daniel Henrique Barboza wrote:
> The RTAS set-indicator call, when attempting to UNISOLATE a DRC that is
> already UNISOLATED or CONFIGURED, returns RTAS_OK and does nothing else
> for both QEMU and phyp. This gives us an opportunity to use this
> behavior to signal the hypervisor layer when an error during device
> removal happens, allowing it to do a proper error handling, while not
> breaking QEMU/phyp implementations that don't have this support.
>
> This patch introduces this idea by unisolating all CPU DRCs that failed
> to be removed by dlpar_cpu_remove_by_index(), when handling the
> PSERIES_HP_ELOG_ID_DRC_INDEX event. This is being done for this event
> only because its the only CPU removal event QEMU uses, and there's no
> need at this moment to add this mechanism for phyp only code.
>
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
except...
> ---
> arch/powerpc/platforms/pseries/hotplug-cpu.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
> index 12cbffd3c2e3..ed66895c2f51 100644
> --- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
> +++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
> @@ -802,8 +802,15 @@ int dlpar_cpu(struct pseries_hp_errorlog *hp_elog)
> case PSERIES_HP_ELOG_ACTION_REMOVE:
> if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_COUNT)
> rc = dlpar_cpu_remove_by_count(count);
> - else if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_INDEX)
> + else if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_INDEX) {
> rc = dlpar_cpu_remove_by_index(drc_index);
> + /* Setting the isolation state of an UNISOLATED/CONFIGURED
> + * device to UNISOLATE is a no-op, but the hypervison can
typo here s/hypervison/hypervisor/
> + * use it as a hint that the cpu removal failed.
> + */
> + if (rc)
> + dlpar_unisolate_drc(drc_index);
> + }
> else
> rc = -EINVAL;
> break;
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2021-04-19 4:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-16 21:02 [PATCH 0/2] pseries: UNISOLATE DRCs to signal device removal error Daniel Henrique Barboza
2021-04-16 21:02 ` [PATCH 1/2] dlpar.c: introduce dlpar_unisolate_drc() Daniel Henrique Barboza
2021-04-19 4:01 ` David Gibson
2021-04-16 21:02 ` [PATCH 2/2] hotplug-cpu.c: set UNISOLATE on dlpar_cpu_remove() failure Daniel Henrique Barboza
2021-04-19 4:02 ` David Gibson [this message]
2021-04-19 12:48 ` Michael Ellerman
2021-04-19 13:13 ` Daniel Henrique Barboza
2021-04-20 3:57 ` Michael Ellerman
2021-04-19 3:59 ` [PATCH 0/2] pseries: UNISOLATE DRCs to signal device removal error David Gibson
2021-04-21 13:08 ` Michael Ellerman
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