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Fri, 20 Sep 2024 15:35:05 -0700 From: Zhi Wang To: , CC: , , , , , , , , , , , , , , , , , , , Subject: [RFC 12/13] vfio/cxl: VFIO variant driver for QEMU CXL accel device Date: Fri, 20 Sep 2024 15:34:45 -0700 Message-ID: <20240920223446.1908673-13-zhiw@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240920223446.1908673-1-zhiw@nvidia.com> References: <20240920223446.1908673-1-zhiw@nvidia.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9D3:EE_|MN0PR12MB5788:EE_ X-MS-Office365-Filtering-Correlation-Id: b602c0b5-eaa5-4c8f-3421-08dcd9c48464 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|82310400026|376014|1800799024|36860700013; X-Microsoft-Antispam-Message-Info: UnuJ4auzK0KCUzTxLahkH4nblPEkaAQwevxzn3jJ6pKocSeCicS/KQqVqlHNu7NxX+L+eFM5mhesUqGl7sk19clkOSspDB6dWd1JesWZ2Au6PjicKIgAwiPycPMzjLLDnLMf3mtPnZyXOsPnamvki+JFKyEVduqVsWehmo9NcLKzTVpUJqYhnXRTtZcY0ITaeFK6MrJCa0b50Lp+q/lyz0j3louNaRoWPPs/F2NEwlDH9/kAVcaN6FcX64EQfqh5vp+FDlZFIzoEFmx9AJ81BRWLhqN2yzJFF3O9Sj7L6WfUFkFB0D6r3S5SLmZOjsfNd3cCXiEdYIFeYzdQ1ygPXnfPdZvuqBwVze8aV5jaMFmp4UrIWxFM4Enxzcgl5/v6XLome63Oj49chVMfJK7azSlGhBMbLAzhtXTiyytacJuK5rHmXSd0FbRv+Z+CswYqaSOE9Ih00ujt8vHE6/ygJeKq9folAfRai3ok99Q6ipx9Eyoz1miVLEpZCy8sXGVlhXe1Guug+cK1CH4vxvMz2KvlGa2jDtPNTHj2oYIlhSUA+C3L0JKXwcvm3d7owHKoMgZkWcCGEhlpadSKrW+kouIF77RIoxeieTZ4BRuOnNX+NxO2M0KhsHFgxz2BOX114mTjFAV/LhYFkjh07mqSqfUZn7YcMvwrKDlxlZDb/5JJ06iO35mSYIfmqWehlYE4o3PGsUx/jpMhjBWUTjwKYvGu3Rzsrm4vf48xSOIEs74XBmDj4fc/MsQufhO0rg/5VemNMOSgEatjDlYW0rWxR/T0KbMW+qMOe4GFZN0P9e/BgPzgl2C+Y0/JJvMqnnXZJG/3mQjOoshlU8kBeISu7IGG5x9KbbPYW4x+Y6DMcvKxu1STp06v/bblnJ6nYU6tJK54cfpjm1bcmAMDZUExifv0srGtkSUuQilIeZ1GN6q/RS5oADTgpyDnK9rvjZhGo9jEJHHIHjMsstr5nIl4pyvUSpUA9badviyoVS1QtjOw26AXgFR0YT6gd+ZMHWwCWXSPCFjXJkqKMsevRiSCMEvtPQsg9vss/pDkZoQo53B02ainTn+Ku4k4htmNOY33uWVpaMVT/H4pwyIQtt2tHdeBk/J2cpvb3kRp4WcL8VGXENprCYiviPL94OcBGJaBsvcJsexvG/+QKNqCPJVsbjoi2BnqWY5rm4KHtoIO5CqWB+pgwxKRp4KB+4eoBh1mqXjpV/L05Xz+ckqf3S+nlqmrlNxTFHZESy9hAm+qHDxigd1Yfax5kdBiqiOUDKuSSSK27/T2XkVLDykJv3C/HI19TmA1KJYQsuHTuPWzaKU+6jxdn2wcp4Ou1Yr/OpR+SxZ6o4ZCOs31jb6//v50DbN6wwX4u+x7zgs5hYDrgw+vCXxWv1S7lQEjo3fFm8SD+JOwdh8kNvMefWan2dpVFQfd6IuQH3AGXPgDUIAbzSpr29abhtgk2x+y9Z627RqN X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(7416014)(82310400026)(376014)(1800799024)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Sep 2024 22:35:23.6338 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b602c0b5-eaa5-4c8f-3421-08dcd9c48464 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000E9D3.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB5788 To demostrate the VFIO CXL core, a VFIO variant driver for QEMU CXL accel device is introduced, so that people to test can try the patches. This patch is not meant to be merged. Signed-off-by: Zhi Wang --- drivers/vfio/pci/Kconfig | 2 + drivers/vfio/pci/Makefile | 2 + drivers/vfio/pci/cxl-accel/Kconfig | 6 ++ drivers/vfio/pci/cxl-accel/Makefile | 3 + drivers/vfio/pci/cxl-accel/main.c | 116 ++++++++++++++++++++++++++++ 5 files changed, 129 insertions(+) create mode 100644 drivers/vfio/pci/cxl-accel/Kconfig create mode 100644 drivers/vfio/pci/cxl-accel/Makefile create mode 100644 drivers/vfio/pci/cxl-accel/main.c diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig index 2196e79b132b..9eebce09ffa2 100644 --- a/drivers/vfio/pci/Kconfig +++ b/drivers/vfio/pci/Kconfig @@ -75,4 +75,6 @@ source "drivers/vfio/pci/nvgrace-gpu/Kconfig" source "drivers/vfio/pci/qat/Kconfig" +source "drivers/vfio/pci/cxl-accel/Kconfig" + endmenu diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile index b51221b94b0b..03293b52c5e3 100644 --- a/drivers/vfio/pci/Makefile +++ b/drivers/vfio/pci/Makefile @@ -22,3 +22,5 @@ obj-$(CONFIG_VIRTIO_VFIO_PCI) += virtio/ obj-$(CONFIG_NVGRACE_GPU_VFIO_PCI) += nvgrace-gpu/ obj-$(CONFIG_QAT_VFIO_PCI) += qat/ + +obj-$(CONFIG_CXL_ACCEL_VFIO_PCI) += cxl-accel/ diff --git a/drivers/vfio/pci/cxl-accel/Kconfig b/drivers/vfio/pci/cxl-accel/Kconfig new file mode 100644 index 000000000000..c3c9d7ec7fa4 --- /dev/null +++ b/drivers/vfio/pci/cxl-accel/Kconfig @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0-only +config CXL_ACCEL_VFIO_PCI + tristate "VFIO support for the QEMU CXL accel device" + select VFIO_CXL_CORE + help + If you don't know what to do here, say N. diff --git a/drivers/vfio/pci/cxl-accel/Makefile b/drivers/vfio/pci/cxl-accel/Makefile new file mode 100644 index 000000000000..20f190482cc9 --- /dev/null +++ b/drivers/vfio/pci/cxl-accel/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_CXL_ACCEL_VFIO_PCI) += cxl-accel-vfio-pci.o +cxl-accel-vfio-pci-y := main.o diff --git a/drivers/vfio/pci/cxl-accel/main.c b/drivers/vfio/pci/cxl-accel/main.c new file mode 100644 index 000000000000..1672fb9d9232 --- /dev/null +++ b/drivers/vfio/pci/cxl-accel/main.c @@ -0,0 +1,116 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved + */ + +#include +#include + +struct cxl_device { + struct vfio_pci_core_device core_device; +}; + +static int cxl_open_device(struct vfio_device *vdev) +{ + struct vfio_pci_core_device *core_dev = + container_of(vdev, struct vfio_pci_core_device, vdev); + struct resource res; + int ret; + + /* Provide the device infomation to the kernel CXL core.*/ + /* Device DPA */ + res = DEFINE_RES_MEM(0, SZ_256M); + vfio_cxl_core_set_resource(core_dev, res, CXL_ACCEL_RES_DPA); + + /* Device RAM */ + res = DEFINE_RES_MEM_NAMED(0, SZ_256M, "ram"); + vfio_cxl_core_set_resource(core_dev, res, CXL_ACCEL_RES_RAM); + + /* The expected size of the CXL region to be created */ + vfio_cxl_core_set_region_size(core_dev, SZ_256M); + vfio_cxl_core_set_driver_hdm_cap(core_dev); + + /* Initailize the CXL device and enable the vfio-pci-core */ + ret = vfio_cxl_core_enable(core_dev); + if (ret) + return ret; + + vfio_cxl_core_finish_enable(core_dev); + + return 0; +} + +static const struct vfio_device_ops cxl_core_ops = { + .name = "cxl-vfio-pci", + .init = vfio_pci_core_init_dev, + .release = vfio_pci_core_release_dev, + .open_device = cxl_open_device, + .close_device = vfio_cxl_core_close_device, + .ioctl = vfio_pci_core_ioctl, + .device_feature = vfio_pci_core_ioctl_feature, + .read = vfio_cxl_core_read, + .write = vfio_cxl_core_write, + .mmap = vfio_pci_core_mmap, + .request = vfio_pci_core_request, + .match = vfio_pci_core_match, + .bind_iommufd = vfio_iommufd_physical_bind, + .unbind_iommufd = vfio_iommufd_physical_unbind, + .attach_ioas = vfio_iommufd_physical_attach_ioas, + .detach_ioas = vfio_iommufd_physical_detach_ioas, +}; + +static int cxl_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + const struct vfio_device_ops *ops = &cxl_core_ops; + struct cxl_device *cxl_device; + int ret; + + cxl_device = vfio_alloc_device(cxl_device, core_device.vdev, + &pdev->dev, ops); + if (IS_ERR(cxl_device)) + return PTR_ERR(cxl_device); + + dev_set_drvdata(&pdev->dev, &cxl_device->core_device); + + ret = vfio_pci_core_register_device(&cxl_device->core_device); + if (ret) + goto out_put_vdev; + + return ret; + +out_put_vdev: + vfio_put_device(&cxl_device->core_device.vdev); + return ret; +} + +static void cxl_remove(struct pci_dev *pdev) +{ + struct vfio_pci_core_device *core_device = dev_get_drvdata(&pdev->dev); + + vfio_pci_core_unregister_device(core_device); + vfio_put_device(&core_device->vdev); +} + +static const struct pci_device_id cxl_vfio_pci_table[] = { + { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0xd94) }, + {} +}; + +MODULE_DEVICE_TABLE(pci, cxl_vfio_pci_table); + +static struct pci_driver cxl_vfio_pci_driver = { + .name = KBUILD_MODNAME, + .id_table = cxl_vfio_pci_table, + .probe = cxl_probe, + .remove = cxl_remove, + .err_handler = &vfio_pci_core_err_handlers, + .driver_managed_dma = true, +}; + +module_pci_driver(cxl_vfio_pci_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Zhi Wang "); +MODULE_DESCRIPTION("VFIO variant driver for QEMU CXL accel device"); +MODULE_IMPORT_NS(CXL);