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Wed, 31 May 2023 06:48:06 -0500 Received: from SATLEXMB04.amd.com (10.181.40.145) by SATLEXMB07.amd.com (10.181.41.45) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Wed, 31 May 2023 04:48:05 -0700 Received: from xhdipdslab41.xilinx.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server id 15.1.2375.34 via Frontend Transport; Wed, 31 May 2023 06:48:03 -0500 From: Nipun Gupta To: , , CC: , , , , , Nipun Gupta Subject: [PATCH] cdx: add support for driver managed dma Date: Wed, 31 May 2023 17:17:59 +0530 Message-ID: <20230531114759.6173-1-nipun.gupta@amd.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT080:EE_|SJ2PR12MB8784:EE_ X-MS-Office365-Filtering-Correlation-Id: 1986f9a1-e180-428b-aefe-08db61cce65e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: fwqoYEa9v3Zzk3Yr/QslIWQwmd3Q98a/taJ2teD49vopR4gFFfxxcpJZDnrMJYy11uU+a/i3McYKWq6a5ihgVmlaBiOsP6Azi+mA+JLYyRBQMHlerp3qxyonxhPL6CBcGIDCKQ9fp6robFw+lSQRD1F0WWezk3JAZ2ocyoBYAXT3mKzIhJHYvtk1X16AUsk29C0RN/ylooqaoCfkI96Qq2AJxwye0C+PHDVtcEyk1Yk3QfjAqqCT28mXUE4Dls17SuPhjN38VntZmzPuLTwHjA8Df/f/mgGLqGUc0mcYt87Usv6kAlHxGtUSBjNQM8EfKZgZmRXkQ5wI2wL8M+BxqL/H/fw8nyo9NfbEHpy+paVypi29Gk0C2A5UkG2x6fAzlSPK6uwD6VRL6itqfz/aqqIRuhXifSlg+Sf3k/QK6Nayg6hgdhVDyvknZ5Jp+qeiwBgB/hb3deJTkeGrGaA1ZiZsOwLnBipqZwrinoVeec4sBloPdT5DJ1zvPZmAsvnhtbq/b4565KkNk7mqGLyoEBzzDGDQvg0BelkKQLWLvMbiS+NYL5fnqWajMEJIDCfL1CExz0CQZSjU65Yd7Z9LfWHBHLIkosCgO1IPlVjnWN7aK+yOvsgrUUVTmAdSiY2eewLSmSeXicXByIbAySibop6MPKdIY9WmFd6HghPDlOGF5+3mG1bfry4+uij0iWXx2AVDqhL7zvCGzYJM/3W375oqplN63ozcMp3GsYWaHgd7N7w7ABbNVNNACgMkO9c2yRdnFhYcfxVNM/aiR3BqkA== 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:(13230028)(4636009)(346002)(396003)(39860400002)(136003)(376002)(451199021)(40470700004)(46966006)(36840700001)(4326008)(44832011)(8676002)(8936002)(86362001)(316002)(41300700001)(70586007)(70206006)(110136005)(5660300002)(2906002)(54906003)(478600001)(6666004)(82740400003)(356005)(81166007)(82310400005)(40460700003)(40480700001)(47076005)(186003)(1076003)(26005)(36756003)(36860700001)(2616005)(336012)(426003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 May 2023 11:48:06.7682 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1986f9a1-e180-428b-aefe-08db61cce65e 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: CO1NAM11FT080.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8784 X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE, T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1767410405174330725?= X-GMAIL-MSGID: =?utf-8?q?1767410405174330725?= The devices on cdx could be bound to drivers with the device DMA managed by kernel drivers or user-space applications. As multiple devices can be placed in the same IOMMU group, the DMA on these devices must either be entirely under kernel control or userspace control. driver_managed_dma flag should be set by the driver which assigns the devices to be controlled by user-space. Signed-off-by: Nipun Gupta Suggested-by: Alex Williamson --- drivers/cdx/cdx.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/cdx/cdx.c b/drivers/cdx/cdx.c index 38511fd36325..d2cad4c670a0 100644 --- a/drivers/cdx/cdx.c +++ b/drivers/cdx/cdx.c @@ -62,6 +62,8 @@ #include #include #include +#include +#include #include "cdx.h" /* Default DMA mask for devices on a CDX bus */ @@ -257,6 +259,7 @@ static void cdx_shutdown(struct device *dev) static int cdx_dma_configure(struct device *dev) { + struct cdx_driver *cdx_drv = to_cdx_driver(dev->driver); struct cdx_device *cdx_dev = to_cdx_device(dev); u32 input_id = cdx_dev->req_id; int ret; @@ -267,9 +270,23 @@ static int cdx_dma_configure(struct device *dev) return ret; } + if (!ret && !cdx_drv->driver_managed_dma) { + ret = iommu_device_use_default_domain(dev); + if (ret) + arch_teardown_dma_ops(dev); + } + return 0; } +static void cdx_dma_cleanup(struct device *dev) +{ + struct cdx_driver *cdx_drv = to_cdx_driver(dev->driver); + + if (!cdx_drv->driver_managed_dma) + iommu_device_unuse_default_domain(dev); +} + /* show configuration fields */ #define cdx_config_attr(field, format_string) \ static ssize_t \ @@ -405,6 +422,7 @@ struct bus_type cdx_bus_type = { .remove = cdx_remove, .shutdown = cdx_shutdown, .dma_configure = cdx_dma_configure, + .dma_cleanup = cdx_dma_cleanup, .bus_groups = cdx_bus_groups, .dev_groups = cdx_dev_groups, };