From: John Garry <john.garry@huawei.com>
To: chenxiang <chenxiang66@hisilicon.com>, <jejb@linux.ibm.com>,
<martin.petersen@oracle.com>
Cc: <linux-scsi@vger.kernel.org>, <linuxarm@huawei.com>
Subject: Re: [PATCH 13/15] scsi: hisi_sas: Keep controller active between ISR of phyup and the event being processed
Date: Mon, 13 Dec 2021 10:44:13 +0000 [thread overview]
Message-ID: <eda21591-d691-f892-8ca5-0f5b3d49f496@huawei.com> (raw)
In-Reply-To: <1637117108-230103-14-git-send-email-chenxiang66@hisilicon.com>
On 17/11/2021 02:45, chenxiang wrote:
> From: Xiang Chen<chenxiang66@hisilicon.com>
>
> It is possible that controller may be suspended between ISR of phyup
> and the event being processed, then it can't ensure controller is
> active when processing the phyup event which will cause issues.
> To avoid the issue, add pm_runtime_get_noresume() in ISR of phyup
> and pm_runtime_put_sync() in the work handler exit of a new event
> HISI_PHYE_PHY_UP_PM which is called in v3 hw as runtime PM is
> only supported for v3 hw.
Please consider this rewrite:
It is possible that the controller may become suspended between
processing a phyup interrupt and the event being processed by libsas. As
such, we can't ensure that the controller is active when processing the
phyup event - this may cause the phyup event to be lost or other issues.
To avoid any possible issues, add pm_runtime_get_noresume() in the phyup
interrupt handler and pm_runtime_put_sync() in the work handler exit to
ensure that we stay always active. Since we only want
pm_runtime_get_noresume() called for v3 hw, signal this will a new
event, HISI_PHYE_PHY_UP_PM.
Thanks,
John
next prev parent reply other threads:[~2021-12-13 10:44 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-17 2:44 [PATCH 00/15] Add runtime PM support for libsas chenxiang
2021-11-17 2:44 ` [PATCH 01/15] libsas: Don't always drain event workqueue for HA resume chenxiang
2021-11-17 4:14 ` Bart Van Assche
2021-11-17 5:06 ` Bart Van Assche
2021-11-17 2:44 ` [PATCH 02/15] Revert "scsi: hisi_sas: Filter out new PHY up events during suspend" chenxiang
2021-12-13 10:31 ` John Garry
2021-12-15 7:20 ` chenxiang (M)
2021-11-17 2:44 ` [PATCH 03/15] scsi/block PM: Always set request queue runtime active in blk_post_runtime_resume() chenxiang
2021-11-17 4:58 ` Bart Van Assche
2021-11-17 2:44 ` [PATCH 04/15] scsi: libsas: Add spin_lock/unlock() to protect asd_sas_port->phy_list chenxiang
2021-11-17 2:44 ` [PATCH 05/15] scsi: hisi_sas: Fix some issues related to asd_sas_port->phy_list chenxiang
2021-11-17 2:44 ` [PATCH 06/15] scsi: mvsas: Add spin_lock/unlock() to protect asd_sas_port->phy_list chenxiang
2021-11-17 2:45 ` [PATCH 07/15] scsi: libsas: Send event PORTE_BROADCAST_RCVD for valid ports chenxiang
2021-12-13 11:02 ` John Garry
2021-12-15 7:25 ` chenxiang (M)
2021-11-17 2:45 ` [PATCH 08/15] scsi: hisi_sas: Add more prink for runtime suspend/resume chenxiang
2021-12-13 10:34 ` John Garry
2021-12-15 7:26 ` chenxiang (M)
2021-12-13 10:35 ` John Garry
2021-12-15 7:26 ` chenxiang (M)
2021-11-17 2:45 ` [PATCH 09/15] scsi: libsas: Resume sas host before sending SMP IOs chenxiang
2021-12-13 11:12 ` John Garry
2021-12-15 8:00 ` chenxiang (M)
2021-11-17 2:45 ` [PATCH 10/15] scsi: libsas: Add a flag SAS_HA_RESUMING of sas_ha chenxiang
2021-12-13 11:17 ` John Garry
2021-12-15 7:34 ` chenxiang (M)
2021-11-17 2:45 ` [PATCH 11/15] scsi: libsas: Refactor out sas_queue_deferred_work() chenxiang
2021-12-13 11:20 ` John Garry
2021-12-15 7:59 ` chenxiang (M)
2021-11-17 2:45 ` [PATCH 12/15] scsi: libsas: Defer works of new phys during suspend chenxiang
2021-11-17 2:45 ` [PATCH 13/15] scsi: hisi_sas: Keep controller active between ISR of phyup and the event being processed chenxiang
2021-12-13 10:44 ` John Garry [this message]
2021-12-15 7:57 ` chenxiang (M)
2021-11-17 2:45 ` [PATCH 14/15] scsi: libsas: Keep sas host active until finished some work chenxiang
2021-12-14 12:34 ` John Garry
2021-12-15 7:46 ` chenxiang (M)
2021-11-17 2:45 ` [PATCH 15/15] scsi: hisi_sas: Use autosuspend for SAS controller chenxiang
2021-12-13 10:50 ` John Garry
2021-12-15 7:52 ` chenxiang (M)
2021-11-19 4:04 ` [PATCH 00/15] Add runtime PM support for libsas Martin K. Petersen
2021-11-23 6:01 ` chenxiang (M)
2021-12-14 11:52 ` John Garry
2021-12-15 7:56 ` chenxiang (M)
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