From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753266AbeBZOKo (ORCPT ); Mon, 26 Feb 2018 09:10:44 -0500 Received: from mail-co1nam03on0063.outbound.protection.outlook.com ([104.47.40.63]:10240 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752652AbeBZOKj (ORCPT ); Mon, 26 Feb 2018 09:10:39 -0500 Authentication-Results: spf=pass (sender IP is 149.199.60.100) smtp.mailfrom=xilinx.com; vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=bestguesspass action=none header.from=xilinx.com; To: , CC: From: Bharat Kumar Gogada Subject: Multi MSI with multiple End Points Message-ID: Date: Mon, 26 Feb 2018 19:40:28 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US X-RCIS-Action: ALLOW X-TM-AS-Product-Ver: IMSS-7.1.0.1224-8.2.0.1013-23620.005 X-TM-AS-User-Approved-Sender: Yes;Yes X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:149.199.60.100;IPV:NLI;CTRY:US;EFV:NLI;SFV:NSPM;SFS:(10009020)(39380400002)(396003)(376002)(346002)(39860400002)(2980300002)(438002)(199004)(189003)(305945005)(5660300001)(3260700006)(36756003)(9786002)(356003)(65956001)(50466002)(106466001)(59450400001)(336011)(26005)(77096007)(186003)(65806001)(65826007)(6666003)(64126003)(5890100001)(8746002)(8936002)(81166006)(8676002)(81156014)(4326008)(31686004)(47776003)(63266004)(2906002)(36386004)(23676004)(67846002)(2486003)(106002)(58126008)(110136005)(478600001)(316002)(31696002)(107986001)(5001870100001);DIR:OUT;SFP:1101;SCL:1;SRVR:BLUPR0201MB1460;H:xsj-pvapsmtpgw02;FPR:;SPF:Pass;PTR:unknown-60-100.xilinx.com,xapps1.xilinx.com;A:1;MX:1;LANG:en; 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If we are programming hwirq as MSI data (hwirq being obtained from bitmap_find_next_zero_area, with number of zeroed bits being requested based on number of irq’s being requested). This results in 1st EP is given zero as hwirq, 2nd EP is given one as hwirq. If we use msi data to retrieve virq (use msi data as hwirq), Since as per PCI spec lower 2 bits of MSI data are modifiable for 2nd EP, if an interrupt is raised by 2nd EP on msi data zero, but this is already used by 1st EP, so the current EP’s interrupt will never be served. One way to deal with this issue is, using bit shift operations on hwriq before programming to msi data and at retrieving. Is there any other way to handle this ? Regards, Bharat This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. 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