vfio/pds: Initial support for pds VFIO driver

This is the initial framework for the new pds-vfio-pci device driver.
This does the very basics of registering the PDS PCI device and
configuring it as a VFIO PCI device.

With this change, the VF device can be bound to the pds-vfio-pci driver
on the host and presented to the VM as an ethernet VF.

Signed-off-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20230807205755.29579-3-brett.creeley@amd.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
index 24c5242..45167be 100644 (file)
--- a/drivers/vfio/pci/Makefile
+++ b/drivers/vfio/pci/Makefile
@@ -11,3 +11,5 @@ obj-$(CONFIG_VFIO_PCI) += vfio-pci.o
 obj-$(CONFIG_MLX5_VFIO_PCI)           += mlx5/
 
 obj-$(CONFIG_HISI_ACC_VFIO_PCI) += hisilicon/
+
+obj-$(CONFIG_PDS_VFIO_PCI) += pds/

diff --git a/drivers/vfio/pci/pds/Makefile b/drivers/vfio/pci/pds/Makefile
new file mode 100644 (file)
index 0000000..e5e53a6
--- /dev/null
+++ b/drivers/vfio/pci/pds/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2023 Advanced Micro Devices, Inc.
+
+obj-$(CONFIG_PDS_VFIO_PCI) += pds-vfio-pci.o
+
+pds-vfio-pci-y := \
+       pci_drv.o       \
+       vfio_dev.o

diff --git a/drivers/vfio/pci/pds/pci_drv.c b/drivers/vfio/pci/pds/pci_drv.c
new file mode 100644 (file)
index 0000000..4670ddd
--- /dev/null
+++ b/drivers/vfio/pci/pds/pci_drv.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+#include <linux/vfio.h>
+
+#include <linux/pds/pds_core_if.h>
+
+#include "vfio_dev.h"
+
+#define PDS_VFIO_DRV_DESCRIPTION       "AMD/Pensando VFIO Device Driver"
+#define PCI_VENDOR_ID_PENSANDO         0x1dd8
+
+static int pds_vfio_pci_probe(struct pci_dev *pdev,
+                             const struct pci_device_id *id)
+{
+       struct pds_vfio_pci_device *pds_vfio;
+       int err;
+
+       pds_vfio = vfio_alloc_device(pds_vfio_pci_device, vfio_coredev.vdev,
+                                    &pdev->dev, pds_vfio_ops_info());
+       if (IS_ERR(pds_vfio))
+               return PTR_ERR(pds_vfio);
+
+       dev_set_drvdata(&pdev->dev, &pds_vfio->vfio_coredev);
+
+       err = vfio_pci_core_register_device(&pds_vfio->vfio_coredev);
+       if (err)
+               goto out_put_vdev;
+
+       return 0;
+
+out_put_vdev:
+       vfio_put_device(&pds_vfio->vfio_coredev.vdev);
+       return err;
+}
+
+static void pds_vfio_pci_remove(struct pci_dev *pdev)
+{
+       struct pds_vfio_pci_device *pds_vfio = pds_vfio_pci_drvdata(pdev);
+
+       vfio_pci_core_unregister_device(&pds_vfio->vfio_coredev);
+       vfio_put_device(&pds_vfio->vfio_coredev.vdev);
+}
+
+static const struct pci_device_id pds_vfio_pci_table[] = {
+       { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_PENSANDO, 0x1003) }, /* Ethernet VF */
+       { 0, }
+};
+MODULE_DEVICE_TABLE(pci, pds_vfio_pci_table);
+
+static struct pci_driver pds_vfio_pci_driver = {
+       .name = KBUILD_MODNAME,
+       .id_table = pds_vfio_pci_table,
+       .probe = pds_vfio_pci_probe,
+       .remove = pds_vfio_pci_remove,
+       .driver_managed_dma = true,
+};
+
+module_pci_driver(pds_vfio_pci_driver);
+
+MODULE_DESCRIPTION(PDS_VFIO_DRV_DESCRIPTION);
+MODULE_AUTHOR("Brett Creeley <brett.creeley@amd.com>");
+MODULE_LICENSE("GPL");

diff --git a/drivers/vfio/pci/pds/vfio_dev.c b/drivers/vfio/pci/pds/vfio_dev.c
new file mode 100644 (file)
index 0000000..6d7ff1e
--- /dev/null
+++ b/drivers/vfio/pci/pds/vfio_dev.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#include <linux/vfio.h>
+#include <linux/vfio_pci_core.h>
+
+#include "vfio_dev.h"
+
+struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev)
+{
+       struct vfio_pci_core_device *core_device = dev_get_drvdata(&pdev->dev);
+
+       return container_of(core_device, struct pds_vfio_pci_device,
+                           vfio_coredev);
+}
+
+static int pds_vfio_init_device(struct vfio_device *vdev)
+{
+       struct pds_vfio_pci_device *pds_vfio =
+               container_of(vdev, struct pds_vfio_pci_device,
+                            vfio_coredev.vdev);
+       struct pci_dev *pdev = to_pci_dev(vdev->dev);
+       int err, vf_id;
+
+       vf_id = pci_iov_vf_id(pdev);
+       if (vf_id < 0)
+               return vf_id;
+
+       err = vfio_pci_core_init_dev(vdev);
+       if (err)
+               return err;
+
+       pds_vfio->vf_id = vf_id;
+
+       return 0;
+}
+
+static int pds_vfio_open_device(struct vfio_device *vdev)
+{
+       struct pds_vfio_pci_device *pds_vfio =
+               container_of(vdev, struct pds_vfio_pci_device,
+                            vfio_coredev.vdev);
+       int err;
+
+       err = vfio_pci_core_enable(&pds_vfio->vfio_coredev);
+       if (err)
+               return err;
+
+       vfio_pci_core_finish_enable(&pds_vfio->vfio_coredev);
+
+       return 0;
+}
+
+static const struct vfio_device_ops pds_vfio_ops = {
+       .name = "pds-vfio",
+       .init = pds_vfio_init_device,
+       .release = vfio_pci_core_release_dev,
+       .open_device = pds_vfio_open_device,
+       .close_device = vfio_pci_core_close_device,
+       .ioctl = vfio_pci_core_ioctl,
+       .device_feature = vfio_pci_core_ioctl_feature,
+       .read = vfio_pci_core_read,
+       .write = vfio_pci_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,
+};
+
+const struct vfio_device_ops *pds_vfio_ops_info(void)
+{
+       return &pds_vfio_ops;
+}

diff --git a/drivers/vfio/pci/pds/vfio_dev.h b/drivers/vfio/pci/pds/vfio_dev.h
new file mode 100644 (file)
index 0000000..a4d4b65
--- /dev/null
+++ b/drivers/vfio/pci/pds/vfio_dev.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#ifndef _VFIO_DEV_H_
+#define _VFIO_DEV_H_
+
+#include <linux/pci.h>
+#include <linux/vfio_pci_core.h>
+
+struct pds_vfio_pci_device {
+       struct vfio_pci_core_device vfio_coredev;
+
+       int vf_id;
+};
+
+const struct vfio_device_ops *pds_vfio_ops_info(void);
+struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev);
+
+#endif /* _VFIO_DEV_H_ */