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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BFFB4C77B78 for ; Thu, 4 May 2023 12:18:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=fMMKmWA1GbNVRg0ppv75PCa1LJ0y3fS9oCSNPyqeRMg=; b=mzYf8mqP0X1h6D 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h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BbXzNdxPcjGO34B7zdhv5ZWV5LEvN4cjVh12sq63EG4=; b=gidcvKR34gSCuMExONQ/hoZeB7yA4R21fm8dEKWYTtLk12+qhgdKn5O64FHHon4Ietr048 sIzqcN2vI5BaGcVvvttZ2zcUS60QFP/zTe1eS4mSYOIQR6UzeQ2adPWHwZ62wldOHNgWO8 NlEdi+1+0/wtUEG+zeM+GzOQ7OYXqdyE9qtq5tIsIxfURI/dY30YWzzPgpu7xPXa4ouOak H+jNesa6nG8RXFrJhE/y4yMXGUaQaWtJ1HlI+ZWifoN128UjQUcBC884O8jQu5x84T3FLi Wcescvn/jI+mVr25fMnWqjHOn7OQxrrU9hq7kNMEinNP0gxS+TlVSYkM9ShgZA== Date: Thu, 4 May 2023 14:17:50 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , Yixun Lan , , , , , , , "yonghui.yu" Subject: Re: [PATCH v1 4/5] mtd: rawnand: meson: clear OOB buffer before read Message-ID: <20230504141750.107fb1aa@xps-13> In-Reply-To: <805dea68-8a40-a52a-ad7c-b2e9cd3d05a8@sberdevices.ru> References: <20230412061700.1492474-1-AVKrasnov@sberdevices.ru> <20230418152505.72fc16da@xps-13> <15a6e415-1489-a81f-fc8f-2372678ad2cb@sberdevices.ru> <5e4b395e-bf9d-0123-a0f2-2b378d950b29@sberdevices.ru> <20230502115913.78012d98@xps-13> <2274b432-d1a9-b3cf-4f7b-08c4a4c580b5@sberdevices.ru> <20230502132745.14349770@xps-13> <2b2f5cb4-84f7-65f6-13b2-42f965503023@sberdevices.ru> <20230502141703.29f0bc30@xps-13> <91cb8e19-e782-b847-8d2b-22580c371c34@sberdevices.ru> <20230502150553.65fdeb7f@xps-13> <8996d53c-54ff-6a37-e08b-95cae0629703@sberdevices.ru> <20230503100342.63215058@xps-13> <805dea68-8a40-a52a-ad7c-b2e9cd3d05a8@sberdevices.ru> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230504_051800_117084_B4EA50FE X-CRM114-Status: GOOD ( 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Martin Blumenstingl , Jianxin Pan , Yixun Lan , , , , , , , "yonghui.yu" Subject: Re: [PATCH v1 4/5] mtd: rawnand: meson: clear OOB buffer before read Message-ID: <20230504141750.107fb1aa@xps-13> In-Reply-To: <805dea68-8a40-a52a-ad7c-b2e9cd3d05a8@sberdevices.ru> References: <20230412061700.1492474-1-AVKrasnov@sberdevices.ru> <20230418152505.72fc16da@xps-13> <15a6e415-1489-a81f-fc8f-2372678ad2cb@sberdevices.ru> <5e4b395e-bf9d-0123-a0f2-2b378d950b29@sberdevices.ru> <20230502115913.78012d98@xps-13> <2274b432-d1a9-b3cf-4f7b-08c4a4c580b5@sberdevices.ru> <20230502132745.14349770@xps-13> <2b2f5cb4-84f7-65f6-13b2-42f965503023@sberdevices.ru> <20230502141703.29f0bc30@xps-13> <91cb8e19-e782-b847-8d2b-22580c371c34@sberdevices.ru> <20230502150553.65fdeb7f@xps-13> <8996d53c-54ff-6a37-e08b-95cae0629703@sberdevices.ru> <20230503100342.63215058@xps-13> <805dea68-8a40-a52a-ad7c-b2e9cd3d05a8@sberdevices.ru> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) 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From: Miquel Raynal To: Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , Yixun Lan , , , , , , , "yonghui.yu" Subject: Re: [PATCH v1 4/5] mtd: rawnand: meson: clear OOB buffer before read Message-ID: <20230504141750.107fb1aa@xps-13> In-Reply-To: <805dea68-8a40-a52a-ad7c-b2e9cd3d05a8@sberdevices.ru> References: <20230412061700.1492474-1-AVKrasnov@sberdevices.ru> <20230418152505.72fc16da@xps-13> <15a6e415-1489-a81f-fc8f-2372678ad2cb@sberdevices.ru> <5e4b395e-bf9d-0123-a0f2-2b378d950b29@sberdevices.ru> <20230502115913.78012d98@xps-13> <2274b432-d1a9-b3cf-4f7b-08c4a4c580b5@sberdevices.ru> <20230502132745.14349770@xps-13> <2b2f5cb4-84f7-65f6-13b2-42f965503023@sberdevices.ru> <20230502141703.29f0bc30@xps-13> <91cb8e19-e782-b847-8d2b-22580c371c34@sberdevices.ru> <20230502150553.65fdeb7f@xps-13> <8996d53c-54ff-6a37-e08b-95cae0629703@sberdevices.ru> <20230503100342.63215058@xps-13> 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-0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48300 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229806AbjEDMR7 (ORCPT ); Thu, 4 May 2023 08:17:59 -0400 Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AB4DD5FD3 for ; Thu, 4 May 2023 05:17:55 -0700 (PDT) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id 8A30CE0009; Thu, 4 May 2023 12:17:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1683202674; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BbXzNdxPcjGO34B7zdhv5ZWV5LEvN4cjVh12sq63EG4=; b=gidcvKR34gSCuMExONQ/hoZeB7yA4R21fm8dEKWYTtLk12+qhgdKn5O64FHHon4Ietr048 sIzqcN2vI5BaGcVvvttZ2zcUS60QFP/zTe1eS4mSYOIQR6UzeQ2adPWHwZ62wldOHNgWO8 NlEdi+1+0/wtUEG+zeM+GzOQ7OYXqdyE9qtq5tIsIxfURI/dY30YWzzPgpu7xPXa4ouOak H+jNesa6nG8RXFrJhE/y4yMXGUaQaWtJ1HlI+ZWifoN128UjQUcBC884O8jQu5x84T3FLi Wcescvn/jI+mVr25fMnWqjHOn7OQxrrU9hq7kNMEinNP0gxS+TlVSYkM9ShgZA== Date: Thu, 4 May 2023 14:17:50 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , Yixun Lan , , , , , , , "yonghui.yu" Subject: Re: [PATCH v1 4/5] mtd: rawnand: meson: clear OOB buffer before read Message-ID: <20230504141750.107fb1aa@xps-13> In-Reply-To: <805dea68-8a40-a52a-ad7c-b2e9cd3d05a8@sberdevices.ru> References: <20230412061700.1492474-1-AVKrasnov@sberdevices.ru> <20230418152505.72fc16da@xps-13> <15a6e415-1489-a81f-fc8f-2372678ad2cb@sberdevices.ru> <5e4b395e-bf9d-0123-a0f2-2b378d950b29@sberdevices.ru> <20230502115913.78012d98@xps-13> <2274b432-d1a9-b3cf-4f7b-08c4a4c580b5@sberdevices.ru> <20230502132745.14349770@xps-13> <2b2f5cb4-84f7-65f6-13b2-42f965503023@sberdevices.ru> <20230502141703.29f0bc30@xps-13> <91cb8e19-e782-b847-8d2b-22580c371c34@sberdevices.ru> <20230502150553.65fdeb7f@xps-13> <8996d53c-54ff-6a37-e08b-95cae0629703@sberdevices.ru> <20230503100342.63215058@xps-13> <805dea68-8a40-a52a-ad7c-b2e9cd3d05a8@sberdevices.ru> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Arseniy, avkrasnov@sberdevices.ru wrote on Thu, 4 May 2023 14:37:45 +0300: > On 03.05.2023 13:23, Arseniy Krasnov wrote: > >=20 > >=20 > > On 03.05.2023 11:03, Miquel Raynal wrote: =20 > >> Hi Arseniy, > >> > >> avkrasnov@sberdevices.ru wrote on Tue, 2 May 2023 19:13:38 +0300: > >> =20 > >>> On 02.05.2023 16:05, Miquel Raynal wrote: =20 > >>>> Hi Arseniy, > >>>> > >>>> avkrasnov@sberdevices.ru wrote on Tue, 2 May 2023 15:24:09 +0300: > >>>> =20 > >>>>> On 02.05.2023 15:17, Miquel Raynal wrote: =20 > >>>>>> Hi Arseniy, > >>>>>> > >>>>>> Richard, your input is welcome below :-) > >>>>>> =20 > >>>>>>>>>>>>>> I just checked JFFS2 mount/umount again, here is what i se= e: > >>>>>>>>>>>>>> 0) First attempt to mount JFFS2. > >>>>>>>>>>>>>> 1) It writes OOB to page N (i'm using raw write). It is cl= eanmarker value 0x85 0x19 0x03 0x20. Mount is done. > >>>>>>>>>>>>>> 2) Umount JFFS2. Done. > >>>>>>>>>>>>>> 3) Second attempt to mount JFFS2. > >>>>>>>>>>>>>> 4) It reads OOB from page N (i'm using raw read). Value is= 0x85 0x19 0x03 0x20. Done. > >>>>>>>>>>>>>> 5) It reads page N in ECC mode, and i get: > >>>>>>>>>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0 jffs2: mtd->read(0x100 bytes from= N) returned ECC error > >>>>>>>>>>>>>> 6) Mount failed. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> We already had problem which looks like this on another de= vice. Solution was to use OOB area which is > >>>>>>>>>>>>>> not covered by ECC for JFFS2 cleanmarkers. =20 > >>>>>>>>>>>> > >>>>>>>>>>>> ok, so there is not ECC parity bytes and mtd->read() returns= ECC error. > >>>>>>>>>>>> does it have to use raw write/read on step 1) and 4)? > >>>>>>>>>>>> =20 > >>>>>>>>>>> > >>>>>>>>>>> If i'm using non raw access to OOB, for example write OOB (us= er bytes) in ECC mode, then > >>>>>>>>>>> steps 1) and 4) and 5) passes ok, but write to this page will= be impossible (for example JFFS2 > >>>>>>>>>>> writes to such pages later) - we can't update ECC codes prope= rly without erasing whole page. > >>>>>>>>>>> Write operation will be done without problem, but read will t= rigger ECC errors due to broken > >>>>>>>>>>> ECC codes. > >>>>>>>>>>> > >>>>>>>>>>> In general problem that we discuss is that in current impleme= ntation data and OOB conflicts > >>>>>>>>>>> with each other by sharing same ECC codes, these ECC codes co= uld be written only once (without > >>>>>>>>>>> erasing), while data and OOB has different callbacks to acces= s and thus supposed to work > >>>>>>>>>>> separately. =20 > >>>>>>>>>> > >>>>>>>>>> The fact that there might be helpers just for writing OOB area= s or just > >>>>>>>>>> in-band areas are optimizations. NAND pages are meant to be wr= itten a > >>>>>>>>>> single time, no matter what portion you write. In some cases, = it is > >>>>>>>>>> possible to perform subpage writes if the chip supports it. Pa= ges may > >>>>>>>>>> be split into several areas which cover a partial in-band area= *and* a > >>>>>>>>>> partial OOB area. If you write into the in-band *or* out-of-ba= nd areas > >>>>>>>>>> of a given subpage, you *cannot* write the other part later wi= thout =20 > >>>>>>>>> > >>>>>>>>> Thanks for details! So in case of JFFS2 it looks like strange, = that it tries > >>>>>>>>> to write page after writing clean markers to it before? In the = old vendor's > >>>>>>>>> driver OOB write callback is suppressed by return 0 always and = JFFS2 works > >>>>>>>>> correctly. =20 > >>>>>>>> > >>>>>>>> Can you point the code you're mentioning? (both what JFFS2 which= looks > >>>>>>>> strange to you and the old vendor hack) =20 > >>>>>>> > >>>>>>> Here is version of the old vendor's driver: > >>>>>>> > >>>>>>> https://github.com/kszaq/linux-amlogic/blob/master_new_amports/dr= ivers/amlogic/nand/nand/aml_nand.c#L3260 > >>>>>>> > >>>>>>> In my version there is no BUG() there, but it is same driver for = the same chip. > >>>>>>> > >>>>>>> About JFFS2 - i didn't check its source code, but what I can see = using printk(), is that it first > >>>>>>> tries to write cleanmarker using OOB write callback. Then later i= t tries to write to this page, so > >>>>>>> may be it is unexpected behaviour of JFFS2? =20 > >>>>>> > >>>>>> TBH I am not knowledgeable about JFFS2, maybe Richard can help her= e. > >>>>>> > >>>>>> Are you sure you flash is recognized by JFFS2 as being a NAND devi= ce? > >>>>>> Did you enable CONFIG_JFFS2_FS_WRITEBUFFER correctly? Because > >>>>>> cleanmarker seem to be discarded when using a NAND device, and > >>>>>> recognizing the device as a NAND device requires the above option = to be > >>>>>> set apparently. =20 > >>>>> > >>>>> Yes, I have > >>>>> > >>>>> CONFIG_JFFS2_FS_WRITEBUFFER=3Dy > >>>>> > >>>>> And i see, that jffs2_mark_erased_block() calls jffs2_cleanmarker_o= ob() which checks that we have MTD_NANDFLASH. This > >>>>> check is true, so then jffs2_write_nand_cleanmarker() is called and= there is OOB write in it. So I see opposite thing: > >>>>> cleanmarkers are not discarded with NAND device. =20 > >>>> > >>>> Excellent. So when cleanmarker_size =3D=3D 0, it means there is no > >>>> cleanmarker. But if it is a NAND device, we write the marker anyway. > >>>> > >>>> Well I guess it used to work on old controllers using a Hamming ECC > >>>> engine not protecting any user OOB bytes, so writing the clean marke= rs > >>>> would simply not lead to ECC bytes being produced/written. Or it mig= ht > >>>> have worked as well on controller drivers not enabling the ECC engine > >>>> when performing OOB-only writes. It also requires the chip to be old > >>>> enough to support multiple writes on the same (sub)page as long as t= he > >>>> written bits do not overlap? =20 > >>> > >>> Yes, with controller which supports such modes there will be no probl= em here! > >>> What i see, is that this controller doesn't support multiple writes t= o the > >>> same page in ECC mode(e.g. it can't update ECC correctly). =20 > >> > >> I don't think this is a controller limitation. The NAND chip cannot > >> write ECC bytes a first time and then overwrite other ECC bytes, that > >> cannot work. The fact that we write ECC bytes in the first place is > >> because the ECC engine covers the free OOB bytes used by JFFS2 to write > >> its cleanmarkers. > >> =20 > >>> So in v2 i've added > >>> patch which moves OOB out of ECC area, thus JFFS2 driver will work co= rrectly. =20 > >> > >> I am sorry but the above sentence is not clear to me. I believe you > >> meant the free OOB bytes are moved outside of the area protected by the > >> ECC engine. In this case I guess it should be fine. =20 > >=20 > > Exactly, free bytes which are reported by OOB layout callbacks were mov= ed out of > > ECC area. > > =20 > >> =20 > >>> So for me main question here is: > >>> > >>> How JFFS2 should work with controllers where we can't update data and= OOB > >>> independently? Driver of this filesystem knows nothing about this fea= tures of > >>> the controller. > >>> > >>> Or JFFS2 works incorrectly in my case when it tries to call write pag= e callback > >>> after calling write OOB callback (IIUC it is better to ask Richard as= You mentioned above). > >>> > >>> Or may be it is better to suppress OOB write callback (or set it to N= ULL) in this > >>> driver as in vendor's driver? =20 > >> > >> I would assume using the unprotected free OOB bytes to store the > >> cleanmarkers should work. But that's a bit fragile and very filesystem > >> oriented. I don't like this much. But on the other side JFFS2 is > >> legacy, you should use UBI (which does not play with OOB areas) :-) =20 > >=20 > > Problem here is that we can't use UBI in this case, because it does not= support > > small fs images. So the only way to make JFFS2 work is to move free OOB= bytes to > > non protected area. Otherwise i think we have strange situation that JF= FS2 can't > > work correctly on specific type on NAND controller. We already had same= problem > > on another NAND controller, and solution was to move OOB free bytes no = non-protected > > area: > >=20 > > https://lore.kernel.org/all/20230329114240.378722-1-mmkurbanov@sberdevi= ces.ru/ > >=20 > > Thanks, Arseniy =20 >=20 > Upd: may be i can add option for this driver, which makes JFFS2 work corr= ectly on this chip. > This feature suppresses OOB writes as in old driver. By default it is dis= abled and OOB is > ECC protected(current behaviour), if enabled - it prints WARN_ONCE() and = always returns 0. > What do You think? >=20 > Or may be add an option, which moves free bytes of OOB to ECC non-protect= ed area and it is disabled > by default. I prefer having a single ooblayout where we expose unprotected user OOB bytes only. As of today, the only upstream user of user OOB bytes is JFFS2 anyway. Thanks, Miqu=C3=A8l