From: Bart Van Assche <bvanassche@acm.org>
To: Can Guo <cang@codeaurora.org>,
asutoshd@codeaurora.org, nguyenb@codeaurora.org,
hongwus@codeaurora.org, linux-scsi@vger.kernel.org,
kernel-team@android.com
Cc: Stanley Chu <stanley.chu@mediatek.com>,
Alim Akhtar <alim.akhtar@samsung.com>,
Avri Altman <avri.altman@wdc.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Bean Huo <beanhuo@micron.com>, Jaegeuk Kim <jaegeuk@kernel.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Kiwoong Kim <kwmad.kim@samsung.com>,
Satya Tangirala <satyat@google.com>,
open list <linux-kernel@vger.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-arm-kernel@lists.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>
Subject: Re: [PATCH v1 2/3] scsi: ufs: Optimize host lock on transfer requests send/compl paths
Date: Mon, 28 Jun 2021 15:58:15 -0700 [thread overview]
Message-ID: <c31185f5-e816-937d-25ac-1657b6111ff8@acm.org> (raw)
In-Reply-To: <1621845419-14194-3-git-send-email-cang@codeaurora.org>
On 5/24/21 1:36 AM, Can Guo wrote:
> Current UFS IRQ handler is completely wrapped by host lock, and because
> ufshcd_send_command() is also protected by host lock, when IRQ handler
> fires, not only the CPU running the IRQ handler cannot send new requests,
> the rest CPUs can neither. Move the host lock wrapping the IRQ handler into
> specific branches, i.e., ufshcd_uic_cmd_compl(), ufshcd_check_errors(),
> ufshcd_tmc_handler() and ufshcd_transfer_req_compl(). Meanwhile, to further
> reduce occpuation of host lock in ufshcd_transfer_req_compl(), host lock is
> no longer required to call __ufshcd_transfer_req_compl(). As per test, the
> optimization can bring considerable gain to random read/write performance.
Hi Can,
Since this patch has been applied on the AOSP kernel we see 100%
reproducible lockups appearing on multiple test setups. Examples of call
traces:
blk_execute_rq()
__scsi_execute()
sd_sync_cache()
sd_suspend_common()
sd_suspend_system()
scsi_bus_suspend()
__device_suspend()
blk_execute_rq()
__scsi_execute()
ufshcd_clear_ua_wlun()
ufshcd_err_handling_unprepare()
ufshcd_err_handler()
process_one_work()
Reverting this patch and the next patch from this series solved the
lockups. Do you prefer to revert this patch or do you perhaps want us to
test a potential fix?
Thanks,
Bart.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-06-28 23:00 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1621845419-14194-1-git-send-email-cang@codeaurora.org>
2021-05-24 8:36 ` [PATCH v1 2/3] scsi: ufs: Optimize host lock on transfer requests send/compl paths Can Guo
2021-05-24 20:10 ` Bart Van Assche
[not found] ` <d4ff8e1a-f368-6720-798a-a2a31a4d41fb@codeaurora.org>
2021-05-25 8:24 ` Avri Altman
2021-05-28 7:30 ` Avri Altman
[not found] ` <0cfbf580e340073ff972be493a59dbe7@codeaurora.org>
2021-05-25 16:40 ` Bart Van Assche
2021-05-31 16:04 ` Bean Huo
2021-06-03 0:18 ` Bart Van Assche
2021-06-03 2:54 ` Stanley Chu
2021-06-17 2:49 ` Bart Van Assche
2021-06-28 22:58 ` Bart Van Assche [this message]
[not found] ` <464097469b09752ce4ebb38c08f1a94a@codeaurora.org>
2021-07-01 15:57 ` Bart Van Assche
2021-05-24 8:36 ` [PATCH v1 3/3] scsi: ufs: Utilize Transfer Request List Completion Notification Register Can Guo
2021-05-31 16:05 ` Bean Huo
2021-06-03 2:54 ` Stanley Chu
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