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2020 16:48:48 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs02n1.mediatek.inc (172.21.101.77) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 14 Jul 2020 16:48:46 +0800 Received: from [172.21.77.33] (172.21.77.33) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 14 Jul 2020 16:48:46 +0800 Message-ID: <1594716527.22878.28.camel@mtkswgap22> Subject: RE: [PATCH v3] scsi: ufs: Cleanup completed request without interrupt notification From: Stanley Chu To: Avri Altman CC: "linux-scsi@vger.kernel.org" , "martin.petersen@oracle.com" , "alim.akhtar@samsung.com" , "jejb@linux.ibm.com" , "bvanassche@acm.org" , "beanhuo@micron.com" , "asutoshd@codeaurora.org" , "cang@codeaurora.org" , "matthias.bgg@gmail.com" , "linux-mediatek@lists.infradead.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "kuohong.wang@mediatek.com" , "peter.wang@mediatek.com" , "chun-hung.wu@mediatek.com" , "andy.teng@mediatek.com" , "chaotian.jing@mediatek.com" , "cc.chou@mediatek.com" Date: Tue, 14 Jul 2020 16:48:47 +0800 In-Reply-To: References: <20200706132113.21096-1-stanley.chu@mediatek.com> <1594517160.10600.33.camel@mtkswgap22> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N Content-Transfer-Encoding: base64 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org SGkgQXZyaSwNCg0KU29ycnkgZm9yIHRoZSBsYXRlIHJlc3BvbnNlLg0KDQpPbiBTdW4sIDIwMjAt MDctMTIgYXQgMTA6MDQgKzAwMDAsIEF2cmkgQWx0bWFuIHdyb3RlOg0KPiANCj4gPiANCj4gPiBI aSBBdnJpLA0KPiA+IA0KPiA+IE9uIFRodSwgMjAyMC0wNy0wOSBhdCAwODozMSArMDAwMCwgQXZy aSBBbHRtYW4gd3JvdGU6DQo+ID4gPiA+DQo+ID4gPiA+IElmIHNvbWVob3cgbm8gaW50ZXJydXB0 IG5vdGlmaWNhdGlvbiBpcyByYWlzZWQgZm9yIGEgY29tcGxldGVkIHJlcXVlc3QNCj4gPiA+ID4g YW5kIGl0cyBkb29yYmVsbCBiaXQgaXMgY2xlYXJlZCBieSBob3N0LCBVRlMgZHJpdmVyIG5lZWRz 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<1594716527.22878.28.camel@mtkswgap22> Subject: RE: [PATCH v3] scsi: ufs: Cleanup completed request without interrupt notification From: Stanley Chu To: Avri Altman Date: Tue, 14 Jul 2020 16:48:47 +0800 In-Reply-To: References: <20200706132113.21096-1-stanley.chu@mediatek.com> <1594517160.10600.33.camel@mtkswgap22> X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200714_044907_780690_E8EBA53A X-CRM114-Status: GOOD ( 35.79 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "linux-scsi@vger.kernel.org" , "martin.petersen@oracle.com" , "andy.teng@mediatek.com" , "jejb@linux.ibm.com" , "chun-hung.wu@mediatek.com" , "kuohong.wang@mediatek.com" , "linux-kernel@vger.kernel.org" , "cc.chou@mediatek.com" , "cang@codeaurora.org" , "linux-mediatek@lists.infradead.org" , "peter.wang@mediatek.com" , "alim.akhtar@samsung.com" , "matthias.bgg@gmail.com" , "asutoshd@codeaurora.org" , "chaotian.jing@mediatek.com" , "bvanassche@acm.org" , "linux-arm-kernel@lists.infradead.org" , "beanhuo@micron.com" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Hi Avri, Sorry for the late response. On Sun, 2020-07-12 at 10:04 +0000, Avri Altman wrote: > > > > > Hi Avri, > > > > On Thu, 2020-07-09 at 08:31 +0000, Avri Altman wrote: > > > > > > > > If somehow no interrupt notification is raised for a completed request > > > > and its doorbell bit is cleared by host, UFS driver needs to cleanup > > > > its outstanding bit in ufshcd_abort(). > > > Theoretically, this case is already accounted for - > > > See line 6407: a proper error is issued and eventually outstanding req is > > cleared. > > > > > > Can you go over the scenario you are attending line by line, > > > And explain why ufshcd_abort does not account for it? > > > > Sure. > > > > If a request using tag N is completed by UFS device without interrupt > > notification till timeout happens, ufshcd_abort() will be invoked. > > > > Since request completion flow is not executed, current status may be > > > > - Tag N in hba->outstanding_reqs is set > > - Tag N in doorbell register is not set > > > > In this case, ufshcd_abort() flow would be > > > > - This log is printed: "ufshcd_abort: cmd was completed, but without a > > notifying intr, tag = N" > > - This log is printed: "ufshcd_abort: Device abort task at tag N" > > - If hba->req_abort_skip is zero, QUERY_TASK command is sent > > - Device responds "UPIU_TASK_MANAGEMENT_FUNC_COMPL" > > - This log is printed: "ufshcd_abort: cmd at tag N not pending in the > > device." > > - Doorbell tells that tag N is not set, so the driver goes to label > > "out" with this log printed: "ufshcd_abort: cmd at tag %d successfully > > cleared from DB." > > - In label "out" section, no cleanup will be made, and then ufshcd_abort > > exits > > - This request will be re-queued to request queue by SCSI timeout > > handler > > > > Now, Inconsistent state shows-up: A request is "re-queued" but its > > corresponding resource in UFS layer is not cleared, below flow will > > trigger bad things, > > > > - A new request with tag M is finished > > - Interrupt is raised and ufshcd_transfer_req_compl() found both tag N > > and M can process the completion flow > > - The post-processing flow for tag N will be executed while its request > > is still alive > > > > I am sorry that below messages are only for old kernel in non-blk-mq > > case. However above scenario will also trigger bad thing in blk-mq case. > > Ok. Thanks. > > > > > > > > > > > > > > Otherwise, system may crash by below abnormal flow: > > > > > > > > After this request is requeued by SCSI layer with its > > > > outstanding bit set, the next completed request will trigger > > > > ufshcd_transfer_req_compl() to handle all "completed outstanding > > > > bits". In this time, the "abnormal outstanding bit" will be detected > > > > and the "requeued request" will be chosen to execute request > > > > post-processing flow. This is wrong and blk_finish_request() will > > > > BUG_ON because this request is still "alive". > > > > > > > > It is worth mentioning that before ufshcd_abort() cleans the timed-out > > > > request, driver need to check again if this request is really not > > > > handled by __ufshcd_transfer_req_compl() yet because it may be > > > > possible that the interrupt comes very lately before the cleaning. > > > What do you mean? Why checking the outstanding reqs isn't enough? > > > > > > > > > > > Signed-off-by: Stanley Chu > > > > --- > > > > drivers/scsi/ufs/ufshcd.c | 9 +++++++-- > > > > 1 file changed, 7 insertions(+), 2 deletions(-) > > > > > > > > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c > > > > index 8603b07045a6..f23fb14df9f6 100644 > > > > --- a/drivers/scsi/ufs/ufshcd.c > > > > +++ b/drivers/scsi/ufs/ufshcd.c > > > > @@ -6462,7 +6462,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd) > > > > /* command completed already */ > > > > dev_err(hba->dev, "%s: cmd at tag %d successfully cleared > > from > > > > DB.\n", > > > > __func__, tag); > > > > - goto out; > > > > + goto cleanup; > > > But you've arrived here only if (!(test_bit(tag, &hba->outstanding_reqs))) - > > > See line 6400. > > > > > > > } else { > > > > dev_err(hba->dev, > > > > "%s: no response from device. tag = %d, err %d\n", > > > > @@ -6496,9 +6496,14 @@ static int ufshcd_abort(struct scsi_cmnd *cmd) > > > > goto out; > > > > } > > > > > > > > +cleanup: > > > > + spin_lock_irqsave(host->host_lock, flags); > > > > + if (!test_bit(tag, &hba->outstanding_reqs)) { > Is this needed? it was already checked in line 6439. > I am worried about the case that interrupt comes very lately. For example, if interrupt finally comes while ufshcd_abort() is handling this command, then probably this command may be completed first by interrupt handler. In this case, ufshcd_abort() shall not clear this command again. In contrast, if ufshcd_abort() clears this command first, then interrupt shall not complete it. Thus here checking hba->outstanding_req with host lock held is required to prevent above racing. Thanks, Stanley Chu _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1514CC433E6 for ; Tue, 14 Jul 2020 08:50:50 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DB37221927 for ; 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bh=vnbU38YH1fLWZ3HM1C/sYvZdgYd9jxLvr3eoKT0+obM=; b=CeMkR8gaz97ktebcZOfMScpiZiYEL8ViFxBqbs2kvvq2VV2GQMtVjBE6hdfWffvoTfRfJbd4SVnwjVTpaVpRE10hgixtSTmxoXVJkhHrgBXdMsoEbw9PSEvWO1Cst3MCCy4YGSRZkyU+ILnBIo1/3/VLqK3KBdabyjJSqtutY2A=; X-UUID: ee9c708786b641918ff2cca24897c9a0-20200714 Received: from mtkcas68.mediatek.inc [(172.29.94.19)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLS) with ESMTP id 1726160556; Tue, 14 Jul 2020 00:49:03 -0800 Received: from MTKMBS02N1.mediatek.inc (172.21.101.77) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 14 Jul 2020 01:48:59 -0700 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs02n1.mediatek.inc (172.21.101.77) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 14 Jul 2020 16:48:46 +0800 Received: from [172.21.77.33] (172.21.77.33) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 14 Jul 2020 16:48:46 +0800 Message-ID: <1594716527.22878.28.camel@mtkswgap22> Subject: RE: [PATCH v3] scsi: ufs: Cleanup completed request without interrupt notification From: Stanley Chu To: Avri Altman Date: Tue, 14 Jul 2020 16:48:47 +0800 In-Reply-To: References: <20200706132113.21096-1-stanley.chu@mediatek.com> <1594517160.10600.33.camel@mtkswgap22> X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200714_044907_780690_E8EBA53A X-CRM114-Status: GOOD ( 35.79 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "linux-scsi@vger.kernel.org" , "martin.petersen@oracle.com" , "andy.teng@mediatek.com" , "jejb@linux.ibm.com" , "chun-hung.wu@mediatek.com" , "kuohong.wang@mediatek.com" , "linux-kernel@vger.kernel.org" , "cc.chou@mediatek.com" , "cang@codeaurora.org" , "linux-mediatek@lists.infradead.org" , "peter.wang@mediatek.com" , "alim.akhtar@samsung.com" , "matthias.bgg@gmail.com" , "asutoshd@codeaurora.org" , "chaotian.jing@mediatek.com" , "bvanassche@acm.org" , "linux-arm-kernel@lists.infradead.org" , "beanhuo@micron.com" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Avri, Sorry for the late response. On Sun, 2020-07-12 at 10:04 +0000, Avri Altman wrote: > > > > > Hi Avri, > > > > On Thu, 2020-07-09 at 08:31 +0000, Avri Altman wrote: > > > > > > > > If somehow no interrupt notification is raised for a completed request > > > > and its doorbell bit is cleared by host, UFS driver needs to cleanup > > > > its outstanding bit in ufshcd_abort(). > > > Theoretically, this case is already accounted for - > > > See line 6407: a proper error is issued and eventually outstanding req is > > cleared. > > > > > > Can you go over the scenario you are attending line by line, > > > And explain why ufshcd_abort does not account for it? > > > > Sure. > > > > If a request using tag N is completed by UFS device without interrupt > > notification till timeout happens, ufshcd_abort() will be invoked. > > > > Since request completion flow is not executed, current status may be > > > > - Tag N in hba->outstanding_reqs is set > > - Tag N in doorbell register is not set > > > > In this case, ufshcd_abort() flow would be > > > > - This log is printed: "ufshcd_abort: cmd was completed, but without a > > notifying intr, tag = N" > > - This log is printed: "ufshcd_abort: Device abort task at tag N" > > - If hba->req_abort_skip is zero, QUERY_TASK command is sent > > - Device responds "UPIU_TASK_MANAGEMENT_FUNC_COMPL" > > - This log is printed: "ufshcd_abort: cmd at tag N not pending in the > > device." > > - Doorbell tells that tag N is not set, so the driver goes to label > > "out" with this log printed: "ufshcd_abort: cmd at tag %d successfully > > cleared from DB." > > - In label "out" section, no cleanup will be made, and then ufshcd_abort > > exits > > - This request will be re-queued to request queue by SCSI timeout > > handler > > > > Now, Inconsistent state shows-up: A request is "re-queued" but its > > corresponding resource in UFS layer is not cleared, below flow will > > trigger bad things, > > > > - A new request with tag M is finished > > - Interrupt is raised and ufshcd_transfer_req_compl() found both tag N > > and M can process the completion flow > > - The post-processing flow for tag N will be executed while its request > > is still alive > > > > I am sorry that below messages are only for old kernel in non-blk-mq > > case. However above scenario will also trigger bad thing in blk-mq case. > > Ok. Thanks. > > > > > > > > > > > > > > Otherwise, system may crash by below abnormal flow: > > > > > > > > After this request is requeued by SCSI layer with its > > > > outstanding bit set, the next completed request will trigger > > > > ufshcd_transfer_req_compl() to handle all "completed outstanding > > > > bits". In this time, the "abnormal outstanding bit" will be detected > > > > and the "requeued request" will be chosen to execute request > > > > post-processing flow. This is wrong and blk_finish_request() will > > > > BUG_ON because this request is still "alive". > > > > > > > > It is worth mentioning that before ufshcd_abort() cleans the timed-out > > > > request, driver need to check again if this request is really not > > > > handled by __ufshcd_transfer_req_compl() yet because it may be > > > > possible that the interrupt comes very lately before the cleaning. > > > What do you mean? Why checking the outstanding reqs isn't enough? > > > > > > > > > > > Signed-off-by: Stanley Chu > > > > --- > > > > drivers/scsi/ufs/ufshcd.c | 9 +++++++-- > > > > 1 file changed, 7 insertions(+), 2 deletions(-) > > > > > > > > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c > > > > index 8603b07045a6..f23fb14df9f6 100644 > > > > --- a/drivers/scsi/ufs/ufshcd.c > > > > +++ b/drivers/scsi/ufs/ufshcd.c > > > > @@ -6462,7 +6462,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd) > > > > /* command completed already */ > > > > dev_err(hba->dev, "%s: cmd at tag %d successfully cleared > > from > > > > DB.\n", > > > > __func__, tag); > > > > - goto out; > > > > + goto cleanup; > > > But you've arrived here only if (!(test_bit(tag, &hba->outstanding_reqs))) - > > > See line 6400. > > > > > > > } else { > > > > dev_err(hba->dev, > > > > "%s: no response from device. tag = %d, err %d\n", > > > > @@ -6496,9 +6496,14 @@ static int ufshcd_abort(struct scsi_cmnd *cmd) > > > > goto out; > > > > } > > > > > > > > +cleanup: > > > > + spin_lock_irqsave(host->host_lock, flags); > > > > + if (!test_bit(tag, &hba->outstanding_reqs)) { > Is this needed? it was already checked in line 6439. > I am worried about the case that interrupt comes very lately. For example, if interrupt finally comes while ufshcd_abort() is handling this command, then probably this command may be completed first by interrupt handler. In this case, ufshcd_abort() shall not clear this command again. In contrast, if ufshcd_abort() clears this command first, then interrupt shall not complete it. Thus here checking hba->outstanding_req with host lock held is required to prevent above racing. Thanks, Stanley Chu _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel