From nobody Mon Jun 29 21:04:52 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C1BCC433EF for ; Wed, 2 Feb 2022 15:15:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241541AbiBBPPr (ORCPT ); Wed, 2 Feb 2022 10:15:47 -0500 Received: from mail-bn7nam10on2040.outbound.protection.outlook.com ([40.107.92.40]:21799 "EHLO NAM10-BN7-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S229758AbiBBPPq (ORCPT ); Wed, 2 Feb 2022 10:15:46 -0500 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=nR+IdV3g3kbSmEtRGhtoyZycA28QvnPLjM2aICjb8dyPe9tBZMki0jwJZyYXJfTfSmIrkIB+8UpH8O9PpSY+C3MppT2Mf0VSnxD8gWvl5at8eixqsLj2kyb47hreQfMBxVjnCW5SsuL6vIRjFtk7rYQJZ0nrEAPt2x22HtzxGLSH8GFhmONuxI1fMSb8s+MS/TpTBTg0L3fP3RCQGo04XfNq8HXJ2YFIzT38hm/89PR2ObviJfBInjM5WIPKpbeBqSx2uZS5XW3z9yh5LenBHm22nZXQaLJbeH+rKGTQTmKePt2vPmSMAvrIg0xTV1xoofxfPKPtSoDj2Ei3yv8pHQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=CFEn0UUnaUvIrAwe2SsbLn28fGMHteelCuGN/CViotY=; b=go/rKBifldCbcyJRIbiuVtgr+Ik80jLE696iPcjmi53Mcphui+8iPsbo5Qe+awRAuoHNNwjayaylu5cJwZAF3QYiWWXT1wFpCxpcLBkham8nnXaBB+982p263nzMR+F5eLlV2TnzUeIORsSWBTfz7xPn1qI6cqr5SUjMDDaStIY1jSzCnZ8fOhyyeCEYA2ih5F0/YqvVcPE1kPsF1GBJWn9S6+AlAq7cTR3Z4MuYWO9oqfVvQv4WHewHJpFWDXJJgyhGWkk8pDrMz0Y/54mscGaFt8oaZVy/ImE8fX+/Jc7T2WIzlQa6zSALyJxPcO3P7daCaBk5TLNE7feFuvZyhw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=CFEn0UUnaUvIrAwe2SsbLn28fGMHteelCuGN/CViotY=; b=n+90alCJcS8qj/x4xLQ6yqIDeJoSJpK+N8yjjEbkTcueDVsU9ilvIe/I6Ji5xZcUPBQCPGAkrIbFhycNSdJJ5TXUeArYnRfUJnok/QqmqT9YDdldGCN/HsUi1b//iK9u+2IUTtHapfDg9yn54ETCIbmt0GSB/Ssf9Xqucgb8/Vk= Received: from CO1PR15CA0067.namprd15.prod.outlook.com (2603:10b6:101:20::11) by DM5PR1201MB0219.namprd12.prod.outlook.com (2603:10b6:4:56::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4930.15; Wed, 2 Feb 2022 15:15:43 +0000 Received: from CO1NAM11FT050.eop-nam11.prod.protection.outlook.com (2603:10b6:101:20:cafe::73) by CO1PR15CA0067.outlook.office365.com (2603:10b6:101:20::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4951.12 via Frontend Transport; Wed, 2 Feb 2022 15:15:42 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; Received: from SATLEXMB04.amd.com (165.204.84.17) by CO1NAM11FT050.mail.protection.outlook.com (10.13.174.79) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.4951.12 via Frontend Transport; Wed, 2 Feb 2022 15:15:42 +0000 Received: from sanjuamdntb2.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.18; Wed, 2 Feb 2022 09:15:38 -0600 From: Sanjay R Mehta To: CC: , , , , , , , , Sanjay R Mehta Subject: [PATCH v2 1/2] dmaengine: ptdma: fix concurrency issue with multiple dma transfer Date: Wed, 2 Feb 2022 09:14:39 -0600 Message-ID: <1643814880-3882-2-git-send-email-Sanju.Mehta@amd.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1643814880-3882-1-git-send-email-Sanju.Mehta@amd.com> References: <1643814880-3882-1-git-send-email-Sanju.Mehta@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: f8681760-4db6-4865-259a-08d9e65ee125 X-MS-TrafficTypeDiagnostic: DM5PR1201MB0219:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230001)(4636009)(46966006)(40470700004)(36840700001)(86362001)(82310400004)(81166007)(356005)(40460700003)(36860700001)(8936002)(8676002)(70586007)(70206006)(4326008)(54906003)(316002)(6916009)(5660300002)(26005)(16526019)(36756003)(2616005)(426003)(47076005)(83380400001)(336012)(508600001)(7696005)(2906002)(186003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Feb 2022 15:15:42.6383 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f8681760-4db6-4865-259a-08d9e65ee125 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT050.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR1201MB0219 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Sanjay R Mehta The command should be submitted only if the engine is idle, for this, the next available descriptor is checked and set the flag to false in case the descriptor is non-empty. Signed-off-by: Sanjay R Mehta --- drivers/dma/ptdma/ptdma-dmaengine.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/dma/ptdma/ptdma-dmaengine.c b/drivers/dma/ptdma/ptdma-= dmaengine.c index c9e52f6..e38dca4 100644 --- a/drivers/dma/ptdma/ptdma-dmaengine.c +++ b/drivers/dma/ptdma/ptdma-dmaengine.c @@ -233,9 +233,14 @@ static void pt_issue_pending(struct dma_chan *dma_chan) struct pt_dma_chan *chan =3D to_pt_chan(dma_chan); struct pt_dma_desc *desc; unsigned long flags; + bool engine_is_idle =3D true; =20 spin_lock_irqsave(&chan->vc.lock, flags); =20 + desc =3D pt_next_dma_desc(chan); + if (desc) + engine_is_idle =3D false; + vchan_issue_pending(&chan->vc); =20 desc =3D pt_next_dma_desc(chan); @@ -243,7 +248,7 @@ static void pt_issue_pending(struct dma_chan *dma_chan) spin_unlock_irqrestore(&chan->vc.lock, flags); =20 /* If there was nothing active, start processing */ - if (desc) + if (engine_is_idle) pt_cmd_callback(desc, 0); } =20 --=20 2.7.4 From nobody Mon Jun 29 21:04:52 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26D37C433FE for ; Wed, 2 Feb 2022 15:15:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229758AbiBBPPx (ORCPT ); Wed, 2 Feb 2022 10:15:53 -0500 Received: from mail-dm6nam11on2053.outbound.protection.outlook.com ([40.107.223.53]:17367 "EHLO NAM11-DM6-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S239404AbiBBPPv (ORCPT ); Wed, 2 Feb 2022 10:15:51 -0500 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=OqjYOqFh8JSXQJ9Mj+Eaw6BGZ2e8RT6VYqG47WvQ/zj/qRyyGNOarfoYsKuqN1cSpELki6R1sc92q72HtVYdAuJJYi5iUxbZilH8KJ8V20cR442TxCH+VDmm7qut4egxYmEgbcyPbHIwUKxT5YVbm48w/6DOxpfejFJuBzcfbiMNhEDZ2KBMosiNmTlTOtBF+h9StRQQGJR/J/9bU+utT0UI/XkjdP+tQqrQxeW1Yd1EMwoL7EfwtA9rRTYswe3DWBjR/+LoXZcvLDEDbRB4rKvCqLzlfTQJGLZ+C3fzEY1nFFo9OV2xyHvi76kwYnc9afsb/DDtCj7MpmS2+AmEgA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=ICvFwPO+MqgZci5I82ZuvqG2YUix/dEwATteDntxTDE=; b=gF87/89RN9OMZXscvoBiqzggwRebVpLW3wQf172cAiPKIJqxCu0UDx/ixGfRGMosbB2APIkiGJqO5Ndu7AWs3Xn2+CCqpKsetnptUFkH2ItwwKH6QoYsbplteQo3DffYwhRJwX6ffxaCAY6bvNzSh8S8Q2/M3iwYATICV5xDV8tiiHmJTbxpqZ1BWwLCHTIAMiGdJ5Gymq5utObX/274O4uEMSqkHetmBRS6lOgIxTSK5Mt8im1lfvN7V45nvrIvbqF0d2yZcmGGw9DK/OsJjKrxL+/U1tMk+1wU3v9bxn45WgBT4NabvITJtqDq1pO9637FIp02f4b25SqE5dhuDQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ICvFwPO+MqgZci5I82ZuvqG2YUix/dEwATteDntxTDE=; b=cby0a78c3i2u20sK+SyXoh1Hm5/sRuK3XAV5C1CcaWNkcuxbKvJfKcaVuU65AJuw/AqtI4d9FvwOogb6N+AWbJ3qZGkaOVg+amNfZECcxMEmBOtNmdNaAkU3cVtr5AF5P+BKxfksHkYuUy/IQI1NbnmQOfKfzF8D7ecP2SKjibU= Received: from MWHPR08CA0043.namprd08.prod.outlook.com (2603:10b6:300:c0::17) by BYAPR12MB3608.namprd12.prod.outlook.com (2603:10b6:a03:de::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4951.12; Wed, 2 Feb 2022 15:15:48 +0000 Received: from CO1NAM11FT008.eop-nam11.prod.protection.outlook.com (2603:10b6:300:c0:cafe::42) by MWHPR08CA0043.outlook.office365.com (2603:10b6:300:c0::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4951.12 via Frontend Transport; Wed, 2 Feb 2022 15:15:48 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; Received: from SATLEXMB04.amd.com (165.204.84.17) by CO1NAM11FT008.mail.protection.outlook.com (10.13.175.191) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.4951.12 via Frontend Transport; Wed, 2 Feb 2022 15:15:48 +0000 Received: from sanjuamdntb2.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.18; Wed, 2 Feb 2022 09:15:44 -0600 From: Sanjay R Mehta To: CC: , , , , , , , , Sanjay R Mehta Subject: [PATCH v2 2/2] dmaengine: ptdma: handle the cases based on DMA is complete Date: Wed, 2 Feb 2022 09:14:40 -0600 Message-ID: <1643814880-3882-3-git-send-email-Sanju.Mehta@amd.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1643814880-3882-1-git-send-email-Sanju.Mehta@amd.com> References: <1643814880-3882-1-git-send-email-Sanju.Mehta@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 063375ad-e584-450a-7846-08d9e65ee497 X-MS-TrafficTypeDiagnostic: BYAPR12MB3608:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:3044; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230001)(4636009)(36840700001)(46966006)(40470700004)(81166007)(82310400004)(356005)(8676002)(2906002)(8936002)(83380400001)(7696005)(6666004)(4326008)(36860700001)(26005)(336012)(186003)(36756003)(426003)(16526019)(47076005)(70206006)(5660300002)(316002)(70586007)(40460700003)(508600001)(2616005)(6916009)(86362001)(54906003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Feb 2022 15:15:48.4363 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 063375ad-e584-450a-7846-08d9e65ee497 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT008.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB3608 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Sanjay R Mehta There is a need to segregate the cases when DMA is complete or not. In case if DMA is already complete there is no need to handle it again and gracefully exit from the function. Signed-off-by: Sanjay R Mehta --- drivers/dma/ptdma/ptdma-dmaengine.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/drivers/dma/ptdma/ptdma-dmaengine.c b/drivers/dma/ptdma/ptdma-= dmaengine.c index e38dca4..91b93e8 100644 --- a/drivers/dma/ptdma/ptdma-dmaengine.c +++ b/drivers/dma/ptdma/ptdma-dmaengine.c @@ -100,12 +100,17 @@ static struct pt_dma_desc *pt_handle_active_desc(stru= ct pt_dma_chan *chan, spin_lock_irqsave(&chan->vc.lock, flags); =20 if (desc) { - if (desc->status !=3D DMA_ERROR) - desc->status =3D DMA_COMPLETE; - - dma_cookie_complete(tx_desc); - dma_descriptor_unmap(tx_desc); - list_del(&desc->vd.node); + if (desc->status !=3D DMA_COMPLETE) { + if (desc->status !=3D DMA_ERROR) + desc->status =3D DMA_COMPLETE; + + dma_cookie_complete(tx_desc); + dma_descriptor_unmap(tx_desc); + list_del(&desc->vd.node); + } else { + /* Don't handle it twice */ + tx_desc =3D NULL; + } } =20 desc =3D pt_next_dma_desc(chan); --=20 2.7.4