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=-8.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 956CEC5DF60 for ; Thu, 7 Nov 2019 09:53:24 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4CC842084D for ; Thu, 7 Nov 2019 09:53:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=xenosoft.de header.i=@xenosoft.de header.b="kyTPdZC7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4CC842084D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=xenosoft.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D5ADE6B000A; Thu, 7 Nov 2019 04:53:23 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id D0C336B000C; Thu, 7 Nov 2019 04:53:23 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id BDD276B000D; Thu, 7 Nov 2019 04:53:23 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id A21F96B000A for ; Thu, 7 Nov 2019 04:53:23 -0500 (EST) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id 60BB1181AEF1A for ; Thu, 7 Nov 2019 09:53:23 +0000 (UTC) X-FDA: 76129018686.10.drink99_3a8c9b4122e45 X-HE-Tag: drink99_3a8c9b4122e45 X-Filterd-Recvd-Size: 9403 Received: from mo4-p01-ob.smtp.rzone.de (mo4-p01-ob.smtp.rzone.de [85.215.255.53]) by imf08.hostedemail.com (Postfix) with ESMTP for ; Thu, 7 Nov 2019 09:53:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1573120400; s=strato-dkim-0002; d=xenosoft.de; h=In-Reply-To:Date:Message-ID:From:References:Cc:To:Subject: X-RZG-CLASS-ID:X-RZG-AUTH:From:Subject:Sender; bh=trwx3J088ifMSXDlrnn6C1GkVE/t8HLHXAAVx/62/F8=; b=kyTPdZC7fX8WlaHbK1Nfz/mkO9uOLCIgS5gVS7ARlCVbAdLZAdfjV1hren3IXOLlzQ NZZq+lsTmsEAXTxmmTXAFI4zASRcDp2mejTMUVCQcJ2grUMVcjwu8GoYr/t/JHPpsuEa gFuUw4vrWLqgsiN3Z59Butx/GHaIKT0wFxHZxKEn/9T4R+CwmT2CxKcxBO0/Lfxt0cHd wkXd8PXpHKHzY0M0liDEOFhJfWb0iHaZxQ2Ztb16qClo2fexcAAQqKk2602t3eII/nCS mlakg81W3UrLLVmLjmdGXjOChzUVyhyDwzfiUrmcL2AAHGFu7l6PZLeZn4xPQtft1cVG I2cA== X-RZG-AUTH: ":L2QefEenb+UdBJSdRCXu93KJ1bmSGnhMdmOod1DhGM4l4Hio94KKxRySfLxnHfJ+Dkjp5DdBJSrwuuqxvPhWJ4neaR1DEPK76ZrzkovbziPV9Q==" X-RZG-CLASS-ID: mo00 Received: from [IPv6:2a02:8109:89c0:ebfc:5146:21ae:8547:c1e0] by smtp.strato.de (RZmta 44.29.0 AUTH) with ESMTPSA id q007c8vA79rB0Ct (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (curve secp521r1 with 521 ECDH bits, eq. 15360 bits RSA)) (Client did not present a certificate); Thu, 7 Nov 2019 10:53:11 +0100 (CET) Subject: Re: Bug 205201 - overflow of DMA mask and bus mask To: Christoph Hellwig Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Benjamin Herrenschmidt , paulus@samba.org, darren@stevens-zone.net, "contact@a-eon.com" , rtd2@xtra.co.nz, mad skateman , Rob Herring , linuxppc-dev References: <20181213112511.GA4574@lst.de> <008c981e-bdd2-21a7-f5f7-c57e4850ae9a@xenosoft.de> <20190103073622.GA24323@lst.de> <71A251A5-FA06-4019-B324-7AED32F7B714@xenosoft.de> <1b0c5c21-2761-d3a3-651b-3687bb6ae694@xenosoft.de> <3504ee70-02de-049e-6402-2d530bf55a84@xenosoft.de> <46025f1b-db20-ac23-7dcd-10bc43bbb6ee@xenosoft.de> <20191105162856.GA15402@lst.de> From: Christian Zigotzky Message-ID: <2f3c81bd-d498-066a-12c0-0a7715cda18f@xenosoft.de> Date: Thu, 7 Nov 2019 10:53:10 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20191105162856.GA15402@lst.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: de-DE Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 05 November 2019 at 5:28 pm, Christoph Hellwig wrote: > On Tue, Nov 05, 2019 at 08:56:27AM +0100, Christian Zigotzky wrote: >> Hi All, >> >> We still have DMA problems with some PCI devices. Since the PowerPC up= dates >> 4.21-1 [1] we need to decrease the RAM to 3500MB (mem=3D3500M) if we w= ant to >> work with our PCI devices. The FSL P5020 and P5040 have these problems >> currently. >> >> Error message: >> >> [=C2=A0=C2=A0 25.654852] bttv 1000:04:05.0: overflow 0x00000000fe07700= 0+4096 of DMA >> mask ffffffff bus mask df000000 >> >> All 5.x Linux kernels can't initialize a SCSI PCI card anymore so boot= ing >> of a Linux userland isn't possible. >> >> PLEASE check the DMA changes in the PowerPC updates 4.21-1 [1]. The ke= rnel >> 4.20 works with all PCI devices without limitation of RAM. > Can you send me the .config and a dmesg? And in the meantime try the > patch below? > > --- > >From 4d659b7311bd4141fdd3eeeb80fa2d7602ea01d4 Mon Sep 17 00:00:00 2001 > From: Nicolas Saenz Julienne > Date: Fri, 18 Oct 2019 13:00:43 +0200 > Subject: dma-direct: check for overflows on 32 bit DMA addresses > > As seen on the new Raspberry Pi 4 and sta2x11's DMA implementation it i= s > possible for a device configured with 32 bit DMA addresses and a partia= l > DMA mapping located at the end of the address space to overflow. It > happens when a higher physical address, not DMAable, is translated to > it's DMA counterpart. > > For example the Raspberry Pi 4, configurable up to 4 GB of memory, has > an interconnect capable of addressing the lower 1 GB of physical memory > with a DMA offset of 0xc0000000. It transpires that, any attempt to > translate physical addresses higher than the first GB will result in an > overflow which dma_capable() can't detect as it only checks for > addresses bigger then the maximum allowed DMA address. > > Fix this by verifying in dma_capable() if the DMA address range provide= d > is at any point lower than the minimum possible DMA address on the bus. > > Signed-off-by: Nicolas Saenz Julienne > --- > include/linux/dma-direct.h | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h > index adf993a3bd58..6ad9e9ea7564 100644 > --- a/include/linux/dma-direct.h > +++ b/include/linux/dma-direct.h > @@ -3,6 +3,7 @@ > #define _LINUX_DMA_DIRECT_H 1 > =20 > #include > +#include /* for min_low_pfn */ > #include > =20 > #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA > @@ -27,6 +28,13 @@ static inline bool dma_capable(struct device *dev, d= ma_addr_t addr, size_t size) > if (!dev->dma_mask) > return false; > =20 > +#ifndef CONFIG_ARCH_DMA_ADDR_T_64BIT > + /* Check if DMA address overflowed */ > + if (min(addr, addr + size - 1) < > + __phys_to_dma(dev, (phys_addr_t)(min_low_pfn << PAGE_SHIFT))) > + return false; > +#endif > + > return addr + size - 1 <=3D > min_not_zero(*dev->dma_mask, dev->bus_dma_mask); > } Hello Christoph, Thanks a lot for your patch! Unfortunately this patch doesn't solve the=20 issue. Error messages: [=C2=A0=C2=A0=C2=A0 6.041163] bttv: driver version 0.9.19 loaded [=C2=A0=C2=A0=C2=A0 6.041167] bttv: using 8 buffers with 2080k (520 pages= ) each for capture [=C2=A0=C2=A0=C2=A0 6.041559] bttv: Bt8xx card found (0) [=C2=A0=C2=A0=C2=A0 6.041609] bttv: 0: Bt878 (rev 17) at 1000:04:05.0, ir= q: 19,=20 latency: 128, mmio: 0xc20001000 [=C2=A0=C2=A0=C2=A0 6.041622] bttv: 0: using: Typhoon TView RDS + FM Ster= eo / KNC1 TV=20 Station RDS [card=3D53,insmod option] [=C2=A0=C2=A0=C2=A0 6.042216] bttv: 0: tuner type=3D5 [=C2=A0=C2=A0=C2=A0 6.111994] bttv: 0: audio absent, no audio device foun= d! [=C2=A0=C2=A0=C2=A0 6.176425] bttv: 0: Setting PLL: 28636363 =3D> 3546895= 0 (needs up to=20 100ms) [=C2=A0=C2=A0=C2=A0 6.200005] bttv: PLL set ok [=C2=A0=C2=A0=C2=A0 6.209351] bttv: 0: registered device video0 [=C2=A0=C2=A0=C2=A0 6.211576] bttv: 0: registered device vbi0 [=C2=A0=C2=A0=C2=A0 6.214897] bttv: 0: registered device radio0 [=C2=A0 114.218806] bttv 1000:04:05.0: overflow 0x00000000ff507000+4096 o= f=20 DMA mask ffffffff bus mask df000000 [=C2=A0 114.218848] Modules linked in: rfcomm bnep tuner_simple tuner_typ= es=20 tea5767 tuner tda7432 tvaudio msp3400 bttv tea575x tveeprom=20 videobuf_dma_sg videobuf_core rc_core videodev mc btusb btrtl btbcm=20 btintel bluetooth uio_pdrv_genirq uio ecdh_generic ecc [=C2=A0 114.219012] [c0000001ecddf720] [80000000008ff6e8]=20 .buffer_prepare+0x150/0x268 [bttv] [=C2=A0 114.219029] [c0000001ecddf860] [80000000008fff6c]=20 .bttv_qbuf+0x50/0x64 [bttv] ----- Trace: [=C2=A0 462.783184] Call Trace: [=C2=A0 462.783187] [c0000001c6c67420] [c0000000000b3358]=20 .report_addr+0xb8/0xc0 (unreliable) [=C2=A0 462.783192] [c0000001c6c67490] [c0000000000b351c]=20 .dma_direct_map_page+0xf0/0x128 [=C2=A0 462.783195] [c0000001c6c67530] [c0000000000b35b0]=20 .dma_direct_map_sg+0x5c/0xac [=C2=A0 462.783205] [c0000001c6c675e0] [8000000000862e88]=20 .__videobuf_iolock+0x660/0x6d8 [videobuf_dma_sg] [=C2=A0 462.783220] [c0000001c6c676b0] [8000000000854274]=20 .videobuf_iolock+0x98/0xb4 [videobuf_core] [=C2=A0 462.783271] [c0000001c6c67720] [80000000008686e8]=20 .buffer_prepare+0x150/0x268 [bttv] [=C2=A0 462.783276] [c0000001c6c677c0] [8000000000854afc]=20 .videobuf_qbuf+0x2b8/0x428 [videobuf_core] [=C2=A0 462.783288] [c0000001c6c67860] [8000000000868f6c]=20 .bttv_qbuf+0x50/0x64 [bttv] [=C2=A0 462.783383] [c0000001c6c678e0] [80000000007bf208] .v4l_qbuf+0x54/= 0x60=20 [videodev] [=C2=A0 462.783402] [c0000001c6c67970] [80000000007c1eac]=20 .__video_do_ioctl+0x30c/0x3f8 [videodev] [=C2=A0 462.783421] [c0000001c6c67a80] [80000000007c3c08]=20 .video_usercopy+0x18c/0x3dc [videodev] [=C2=A0 462.783440] [c0000001c6c67c00] [80000000007bb14c]=20 .v4l2_ioctl+0x60/0x78 [videodev] [=C2=A0 462.783460] [c0000001c6c67c90] [80000000007d3c48]=20 .v4l2_compat_ioctl32+0x9b4/0x1850 [videodev] [=C2=A0 462.783468] [c0000001c6c67d70] [c0000000001ad9cc]=20 .__se_compat_sys_ioctl+0x284/0x127c [=C2=A0 462.783473] [c0000001c6c67e20] [c00000000000067c] system_call+0x6= 0/0x6c [=C2=A0 462.783475] Instruction dump: [=C2=A0 462.783477] 40fe0044 60000000 892255d0 2f890000 40fe0020 3c82ffc5= =20 39200001 60000000 [=C2=A0 462.783483] 38842029 992255d0 485ad0d9 60000000 <0fe00000> 382100= 70=20 e8010010 7c0803a6 [=C2=A0 462.783490] ---[ end trace b677d4a00458e277 ]--- ----- dmesg fsl p5040: https://bugzilla.kernel.org/attachment.cgi?id=3D285813 Kernel 5.4-rc6 config for the Cyrus+ board and for the QEMU ppce500=20 board (CPU: P5040 and P5020):=20 https://bugzilla.kernel.org/attachment.cgi?id=3D285815 Bug report: https://bugzilla.kernel.org/show_bug.cgi?id=3D205201 Thanks for your help, Christian