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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by SJ5PEPF000001CF.mail.protection.outlook.com (10.167.242.43) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.159.10 via Frontend Transport; Tue, 23 Jun 2026 13:10:05 +0000 Received: from localhost (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Tue, 23 Jun 2026 08:10:05 -0500 From: Nathan Lynch To: Karim Manaouil CC: , , , , Subject: Re: SDXI on AMD EPYC (in relation to =?utf-8?Q?Nathan=E2=80=99s?= SDXI dmaengine patchset) In-Reply-To: <20260623103204.qvmd5luse4vmhwl3@wrangler> References: <20260623103204.qvmd5luse4vmhwl3@wrangler> Date: Tue, 23 Jun 2026 08:10:04 -0500 Message-ID: <875x39ies3.fsf@amd.com> Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001CF:EE_|DM4PR12MB6591:EE_ X-MS-Office365-Filtering-Correlation-Id: 920114a0-3870-4718-4ce1-08ded128be9f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|23010399003|376014|36860700016|1800799024|11063799006|56012099006|6133799003|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: jzh9EJ4D2x2J4k1MVSLHWgOSldolUj1Rh0BbBlynRjFbE7ai6n6QAVHM4fra8I3bNLZDGWpUxA14LqXdH/5+9t/m87SD5fauybkBYjTRI0T/KkiXbZ53ceKrh4hjl+wm+Wt9r62Ctxqaha94IxtocfLtCsbHzP2O2/nidfUCWOs5obcAJy1yYnPKQggOFZYFDMUBUx/qPFDqh7wFTsidPLeX+SDCgnyl5zN/Y40IVG4vBr6t632MUOvhaZQV+unPLb0OwJksRXj4GNU7bJ49unBUveF0GumssI5SLqEtqVJ467NTR/c5qceail2rEiOKJwLYIzahRwfTJrekz8mg82k4568AzuqEDsQjPzegkzs0lTaVKwwU1DaSkUFaemrnGGpEYJEwt84QeViKqTzw5VMHqLw42TbDCBoK7qRc8qskdGfY4wH2AWerZHAlxaK4 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jun 2026 13:10:05.9091 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 920114a0-3870-4718-4ce1-08ded128be9f 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001CF.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6591 Karim Manaouil writes: > > I have a dual-socket AMD EPYC 9004 in the lab (I pasted /proc/cpuinfo at > the end) and I wanted to see if I can get the SDXI series from Nathan [2] > to work on them, as this will open the door for me to experiment more on > AMD hardware. > > I don't know if these CPUs are equipped with these accelerators or not. > lspci is showing these devices (four on each NUMA node): > > # lspci | grep SDXI > 06:00.1 System peripheral: Advanced Micro Devices, Inc. [AMD] SDXI > 21:00.1 System peripheral: Advanced Micro Devices, Inc. [AMD] SDXI > 41:00.1 System peripheral: Advanced Micro Devices, Inc. [AMD] SDXI > 64:00.1 System peripheral: Advanced Micro Devices, Inc. [AMD] SDXI > 81:00.1 System peripheral: Advanced Micro Devices, Inc. [AMD] SDXI > a3:00.1 System peripheral: Advanced Micro Devices, Inc. [AMD] SDXI > c1:00.1 System peripheral: Advanced Micro Devices, Inc. [AMD] SDXI > e1:00.1 System peripheral: Advanced Micro Devices, Inc. [AMD] SDXI > > All of them have these PCI specs > > vendor=0x1022 > device=0x14dc > class=0x088000 > subsystem_vendor=0x1458 > subsystem_device=0x1000 > BARs= BAR0/1 512 KiB prefetchable > BAR2/3 512 KiB prefetchable > > Class 0x088000 is: > base class 0x08 System peripheral > subclass 0x80 Other system peripheral > > However, the PCI device class does not actually match the class from > Nathan's patchset [2]: > > +#define PCI_CLASS_ACCELERATOR_SDXI 0x120100 > > +static const struct pci_device_id sdxi_id_table[] = { > + { PCI_DEVICE_CLASS(PCI_CLASS_ACCELERATOR_SDXI, 0xffffff) }, > + { } > +}; > > So these functions appear to be exposed as generic system peripherals > (base class 0x08, subclass 0x80) rather than as SDXI processing > accelerators (base class 0x12, subclass 0x01). > > Do you know whether these AMD 1022:14dc on this platform are actually > SDXI accelerators? Afraid I don't have any information about these devices. The driver isn't intended to support them.