linux-kernel - RE: [EXT] [PATCH v1 5/5] scsi: ufs: Complete pending requests in host reset and restore path

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Date:   Wed, 13 Nov 2019 22:04:03 +0000
From:   "Bean Huo (beanhuo)" <beanhuo@...ron.com>
To:     Can Guo <cang@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "nguyenb@...eaurora.org" <nguyenb@...eaurora.org>,
        "rnayak@...eaurora.org" <rnayak@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        "saravanak@...gle.com" <saravanak@...gle.com>,
        "salyzyn@...gle.com" <salyzyn@...gle.com>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] [PATCH v1 5/5] scsi: ufs: Complete pending requests in host
 reset and restore path

> 
> In UFS host reset and restore path, before probe, we stop and start the host
> controller once. After host controller is stopped, the pending requests, if any,
> are cleared from the doorbell, but no completion IRQ would be raised due to the
> hba is stopped.
> These pending requests shall be completed along with the first NOP_OUT
> command(as it is the first command which can raise a transfer completion
> IRQ) sent during probe.

Hi, Can
I am not sure for this point, because there is HW/SW device reset before or after host reset/restore.
Device HW/SW reset also will clear the pended tasks in device side. That will be better.
I think Qcom platform already enabled HW reset.

//Bean

> Since the OCSs of these pending requests are not SUCCESS(because they are not
> yet literally finished), their UPIUs shall be dumped. When there are multiple
> pending requests, the UPIU dump can be overwhelming and may lead to stability
> issues because it is in atomic context.
> Therefore, before probe, complete these pending requests right after host
> controller is stopped.