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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 B7AD3C43331 for ; Sat, 28 Mar 2020 07:09:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 786A42072F for ; Sat, 28 Mar 2020 07:09:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585379340; bh=cipgCIDBEEhfK2JjCpfAj7xHv97dJn2WDWEFijWO1fk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=hKPST+Vx+m9EjLxPBhkt//zdxQX2HVFsoje7TUI0CWoNcjdbPbRiKIQuQqBafAv6M YyJgcjMov1bgv7Dooz7XtBrjEgHrjbwPmjHw1aLAeGzaDGBK4bfiXtIQFBvqqeLRBo tct5P2I9KPIOzCRaEZZ2kQyUcSbWplk85TMAI5OI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725937AbgC1HI7 (ORCPT ); Sat, 28 Mar 2020 03:08:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:57794 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725372AbgC1HI7 (ORCPT ); Sat, 28 Mar 2020 03:08:59 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C135020714; Sat, 28 Mar 2020 07:08:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585379337; bh=cipgCIDBEEhfK2JjCpfAj7xHv97dJn2WDWEFijWO1fk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=UcbeFYLqKG2QvF2aRR7TSt/muS6wb5KC7GSvrVZB5E0Xz6FSXbym2UEYiyxX9JEUn Zl1O608YoxzQeVXi+LmFn8ELftma5Sw+oomU7ZWOCURWNQ+XUrbnwtSYW0EXkTuXBW aicGyZBTxsX7VBceEKljS+Au6xIuwufCa3Asm3Mk= Date: Sat, 28 Mar 2020 08:08:53 +0100 From: Greg KH To: John Donnelly Cc: linux-usb@vger.kernel.org Subject: Re: ehci-pci : WARNING: CPU: 0 PID: 347 at kernel/dma/direct.c:34 Message-ID: <20200328070853.GA3643170@kroah.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Fri, Mar 27, 2020 at 11:11:33PM -0500, John Donnelly wrote: > > Hi, > > I am seeing this WARNING event with iommu=off when booting a DL380 server with a 5.4.17 kernel. > > > > [ 7.292703] ehci-pci 0000:00:1a.0: swiotlb buffer is full (sz: 8 bytes), total 0 (slots), used 0 (slots) > [ 7.309834] ehci-pci 0000:00:1a.0: overflow 0x0000000a1c8f9a60+8 of DMA mask ffffffff bus limit 0 > [ 7.325937] ------------[ cut here ]------------ So your system really wants the iommu enabled, I would stick with doing that :) thanks, greg k-h