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, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 563F4C433E3 for ; Mon, 13 Jul 2020 13:14:35 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (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 22D72206F4 for ; Mon, 13 Jul 2020 13:14:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 22D72206F4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id F3A3888902; Mon, 13 Jul 2020 13:14:34 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NTRxRiDt+6kQ; Mon, 13 Jul 2020 13:14:34 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id 64707888F0; Mon, 13 Jul 2020 13:14:34 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 469EBC0888; Mon, 13 Jul 2020 13:14:34 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 73DEDC0733 for ; Mon, 13 Jul 2020 13:14:32 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 6A35F888FB for ; Mon, 13 Jul 2020 13:14:32 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 95cTrVFR4vvy for ; Mon, 13 Jul 2020 13:14:31 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) by hemlock.osuosl.org (Postfix) with ESMTPS id D870E888F0 for ; Mon, 13 Jul 2020 13:14:30 +0000 (UTC) Received: by theia.8bytes.org (Postfix, from userid 1000) id 9B18D36B; Mon, 13 Jul 2020 15:14:27 +0200 (CEST) Date: Mon, 13 Jul 2020 15:14:26 +0200 From: Joerg Roedel To: Robin Murphy Subject: Re: [PATCH 2/2] iommu/dma: Avoid SAC address trick for PCIe devices Message-ID: <20200713131426.GQ27672@8bytes.org> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, jonathan.lemon@gmail.com, dwmw2@infradead.org, hch@lst.de, linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Wed, Jul 08, 2020 at 12:32:42PM +0100, Robin Murphy wrote: > As for the intel-iommu implementation, relegate the opportunistic > attempt to allocate a SAC address to the domain of conventional PCI > devices only, to avoid it increasingly causing far more performance > issues than possible benefits on modern PCI Express systems. > > Signed-off-by: Robin Murphy > --- > drivers/iommu/dma-iommu.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c > index 4959f5df21bd..0ff124f16ad4 100644 > --- a/drivers/iommu/dma-iommu.c > +++ b/drivers/iommu/dma-iommu.c > @@ -426,7 +426,8 @@ static dma_addr_t iommu_dma_alloc_iova(struct iommu_domain *domain, > dma_limit = min(dma_limit, (u64)domain->geometry.aperture_end); > > /* Try to get PCI devices a SAC address */ > - if (dma_limit > DMA_BIT_MASK(32) && dev_is_pci(dev)) > + if (dma_limit > DMA_BIT_MASK(32) && > + dev_is_pci(dev) && !pci_is_pcie(to_pci_dev(dev))) > iova = alloc_iova_fast(iovad, iova_len, > DMA_BIT_MASK(32) >> shift, false); > Unfortunatly this patch causes XHCI initialization failures on my AMD Ryzen system. I will remove both from the IOMMU tree for now. I guess the XHCI chip in my system does not support full 64bit dma addresses and needs a quirk or something like that. But until this is resolved its better to not change the IOVA allocation behavior. Regards, Joerg _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu