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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY 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 D94D2C17441 for ; Wed, 13 Nov 2019 02:27:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B2A5C222D4 for ; Wed, 13 Nov 2019 02:27:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="fIg0/UHb" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727774AbfKMC1b (ORCPT ); Tue, 12 Nov 2019 21:27:31 -0500 Received: from userp2120.oracle.com ([156.151.31.85]:36402 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727556AbfKMC1a (ORCPT ); Tue, 12 Nov 2019 21:27:30 -0500 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xAD2PAsN040558; Wed, 13 Nov 2019 02:27:22 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=to : cc : subject : from : references : date : in-reply-to : message-id : mime-version : content-type; s=corp-2019-08-05; bh=IgQK/jgcaBafwKBfKW4igsisY1VK1bwzHjPq8iG4ra4=; b=fIg0/UHbhZ5D5dw1UucEUyqtCwpnG7xOWcN/8Mi6dNU1liyTWxQkg07nghGoaNkjXIQ6 KaCmFX6CV43uVA+DYhZgXtpz/bbhzEersxdmbk7P7VwbadSWqQPBa1d5d+cQYzTXw1Eo kYt+ZPfG5yN49bYjEslgsNE/75D2LfpCrJ0hR3ElLPauA5aBTZituBiSuYNjNDrgm4mO fjeQEOaQ/scacvW+fPCfj7mJNJQJ5aLJ8DzmqxbLZPaS4YMdiBwRuYEiUK8A7rhJlcqb +11WpXrff52+7saIxaxnowOLXt8HSjtbDEqML4+K2NcOKlC3gjFBihynjK/PJI91yDKG gw== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2120.oracle.com with ESMTP id 2w5p3qrvq5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 13 Nov 2019 02:27:21 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xAD2MlAn190431; Wed, 13 Nov 2019 02:27:21 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3030.oracle.com with ESMTP id 2w7khmf6be-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 13 Nov 2019 02:27:21 +0000 Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id xAD2RFBE025245; Wed, 13 Nov 2019 02:27:15 GMT Received: from ca-mkp.ca.oracle.com (/10.159.214.123) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 12 Nov 2019 18:27:15 -0800 To: Kars de Jong Cc: "James E.J. Bottomley" , linux-scsi@vger.kernel.org, linux-m68k@vger.kernel.org, "Martin K. Petersen" , schmitzmic@gmail.com, fthain@telegraphics.com.au Subject: Re: [PATCH v2] zorro_esp: Limit DMA transfers to 65536 bytes (except on Fastlane) From: "Martin K. Petersen" Organization: Oracle Corporation References: <1573414513.3230.4.camel@linux.ibm.com> <20191112175523.23145-1-jongk@linux-m68k.org> Date: Tue, 12 Nov 2019 21:27:12 -0500 In-Reply-To: <20191112175523.23145-1-jongk@linux-m68k.org> (Kars de Jong's message of "Tue, 12 Nov 2019 18:55:23 +0100") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9439 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=856 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1910280000 definitions=main-1911130018 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9439 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=928 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1910280000 definitions=main-1911130018 Sender: linux-m68k-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org Kars, > When using this driver on a Blizzard 1260, there were failures > whenever DMA transfers from the SCSI bus to memory of 65535 bytes were > followed by a DMA transfer of 1 byte. This caused the byte at offset > 65535 to be overwritten with 0xff. The Blizzard hardware can't handle > single byte DMA transfers. Applied to 5.5/scsi-queue, thanks! -- Martin K. Petersen Oracle Linux Engineering