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=-2.4 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,USER_AGENT_SANE_1 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 2B529C43603 for ; Fri, 20 Dec 2019 19:11:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F0CDE206D3 for ; Fri, 20 Dec 2019 19:11:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="mPeiQp9y" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727509AbfLTTLY (ORCPT ); Fri, 20 Dec 2019 14:11:24 -0500 Received: from aserp2120.oracle.com ([141.146.126.78]:41334 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727394AbfLTTLX (ORCPT ); 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Fri, 20 Dec 2019 19:11:08 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xBKJALLZ041856; Fri, 20 Dec 2019 19:11:08 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3020.oracle.com with ESMTP id 2x13tjuuyh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 20 Dec 2019 19:11:07 +0000 Received: from abhmp0016.oracle.com (abhmp0016.oracle.com [141.146.116.22]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id xBKJB4xp008032; Fri, 20 Dec 2019 19:11:04 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 20 Dec 2019 11:11:04 -0800 Subject: Re: [PATCH v2] xen-pciback: optionally allow interrupt enable flag writes To: =?UTF-8?Q?Marek_Marczykowski-G=c3=b3recki?= , xen-devel@lists.xenproject.org Cc: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Simon Gaiser , Juergen Gross , Stefano Stabellini , YueHaibing , open list References: <20191219034941.19141-1-marmarek@invisiblethingslab.com> From: Boris Ostrovsky Message-ID: <4ed998e1-c8e6-a2c3-031a-9104c912cb76@oracle.com> Date: Fri, 20 Dec 2019 14:11:03 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.0 MIME-Version: 1.0 In-Reply-To: <20191219034941.19141-1-marmarek@invisiblethingslab.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9477 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=994 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-1912200143 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9477 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=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-1912200143 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/18/19 10:49 PM, Marek Marczykowski-Górecki wrote: > --- > drivers/xen/xen-pciback/conf_space.c | 35 ++++++++ > drivers/xen/xen-pciback/conf_space.h | 10 +++ > .../xen/xen-pciback/conf_space_capability.c | 88 +++++++++++++++++++ > drivers/xen/xen-pciback/conf_space_header.c | 19 ++++ > drivers/xen/xen-pciback/pci_stub.c | 66 ++++++++++++++ > drivers/xen/xen-pciback/pciback.h | 1 + > 6 files changed, 219 insertions(+) This also needs an update to Documentation/ABI/testing/sysfs-driver-pciback. > @@ -64,6 +64,7 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data) > int err; > u16 val; > struct pci_cmd_info *cmd = data; > + u16 cap_value; What is this for? > > dev_data = pci_get_drvdata(dev); > if (!pci_is_enabled(dev) && is_enable_cmd(value)) { > @@ -117,6 +118,24 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data) > pci_clear_mwi(dev); > } > > + if (dev_data && dev_data->allow_interrupt_control) { > + if (!(cmd->val & PCI_COMMAND_INTX_DISABLE) && > + (value & PCI_COMMAND_INTX_DISABLE)) { > + pci_intx(dev, 0); > + } else if ((cmd->val & PCI_COMMAND_INTX_DISABLE) && > + !(value & PCI_COMMAND_INTX_DISABLE)) { > + /* Do not allow enabling INTx together with MSI or MSI-X. */ > + switch (xen_pcibk_get_interrupt_type(dev)) { > + case INTERRUPT_TYPE_NONE: > + case INTERRUPT_TYPE_INTX: > + pci_intx(dev, 1); > + break; > + default: > + return PCIBIOS_SET_FAILED; > + } > + } Perhaps this is slightly easier to read: if (cmd->val ^ val)  &  PCI_COMMAND_INTX_DISABLE) {         if (value & PCI_COMMAND_INTX_DISABLE) {                 pci_intx(dev, 0);         } else {                 /* Do not allow enabling INTx together with MSI or MSI-X. */             switch (xen_pcibk_get_interrupt_type(dev)) {                 case INTERRUPT_TYPE_NONE:                 case INTERRUPT_TYPE_INTX:                     pci_intx(dev, 1);                     break;                 default:                     return PCIBIOS_SET_FAILED;             }        } } And also, if INTERRUPT_TYPE_INTX, aren't you already enabled? -boris 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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,USER_AGENT_SANE_1 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 B7DC4C43603 for ; Fri, 20 Dec 2019 19:11:33 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 89AB220866 for ; 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Fri, 20 Dec 2019 19:11:08 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xBKJALLZ041856; Fri, 20 Dec 2019 19:11:08 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3020.oracle.com with ESMTP id 2x13tjuuyh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 20 Dec 2019 19:11:07 +0000 Received: from abhmp0016.oracle.com (abhmp0016.oracle.com [141.146.116.22]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id xBKJB4xp008032; Fri, 20 Dec 2019 19:11:04 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 20 Dec 2019 11:11:04 -0800 To: =?UTF-8?Q?Marek_Marczykowski-G=c3=b3recki?= , xen-devel@lists.xenproject.org References: <20191219034941.19141-1-marmarek@invisiblethingslab.com> From: Boris Ostrovsky Message-ID: <4ed998e1-c8e6-a2c3-031a-9104c912cb76@oracle.com> Date: Fri, 20 Dec 2019 14:11:03 -0500 User-Agent: Mozilla/5.0 (X11; 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