linux-kernel - Re: [PATCH v5 4/7] scsi: libsas: Use new workqueue to run sas event and disco event

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Date:   Fri, 15 Dec 2017 13:20:40 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Jason Yan <yanaijie@...wei.com>, martin.petersen@...cle.com,
        jejb@...ux.vnet.ibm.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        john.garry@...wei.com, zhaohongjiang@...wei.com, hare@...e.com,
        dan.j.williams@...el.com, jthumshirn@...e.de,
        Raj.Dinesh@...rosemi.com, hch@....de, huangdaode@...ilicon.com,
        chenxiang66@...ilicon.com, xiyou.wangcong@...il.com,
        Yijing Wang <wangyijing@...wei.com>,
        Ewan Milne <emilne@...hat.com>, Tomas Henzl <thenzl@...hat.com>
Subject: Re: [PATCH v5 4/7] scsi: libsas: Use new workqueue to run sas event
 and disco event

On 12/08/2017 10:42 AM, Jason Yan wrote:
> Now all libsas works are queued to scsi host workqueue,
> include sas event work post by LLDD and sas discovery
> work, and a sas hotplug flow may be divided into several
> works, e.g libsas receive a PORTE_BYTES_DMAED event,
> currently we process it as following steps:
> sas_form_port  --- run in work in shost workq
> 	sas_discover_domain  --- run in another work in shost workq
> 		...
> 		sas_probe_devices  --- run in new work in shost workq
> We found during hot-add a device, libsas may need run several
> works in same workqueue to add device in system, the process is
> not atomic, it may interrupt by other sas event works, like
> PHYE_LOSS_OF_SIGNAL.
> 
> This patch is preparation of execute libsas sas event in sync. We need
> to use different workqueue to run sas event and disco event. Otherwise
> the work will be blocked for waiting another chained work in the same
> workqueue.
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> CC: John Garry <john.garry@...wei.com>
> CC: Johannes Thumshirn <jthumshirn@...e.de>
> CC: Ewan Milne <emilne@...hat.com>
> CC: Christoph Hellwig <hch@....de>
> CC: Tomas Henzl <thenzl@...hat.com>
> CC: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Jason Yan <yanaijie@...wei.com>
> ---
>  drivers/scsi/libsas/sas_discover.c |  2 +-
>  drivers/scsi/libsas/sas_event.c    |  6 +++---
>  drivers/scsi/libsas/sas_init.c     | 18 ++++++++++++++++++
>  include/scsi/libsas.h              |  3 +++
>  4 files changed, 25 insertions(+), 4 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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