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Subject[PATCH 11/11] mlx5-vfio-pci: add new vfio_pci driver for mlx5 devices
Date
This is the initial step for adding vendor specific vfio_pci driver for
mlx5 devices. mlx5_vfio_pci use vfio_pci_core to register to the VFIO
subsystem and also to implement the basic functionality of a pci device.

It will also extend this basic functionality and add mlx5 specific logic
for various features (such as live migration, for example).

Note: Although we've created the mlx5-vfio-pci.ko, the binding to
vfio-pci.ko will still work as before. It's fully backward compatible.
Of course, the extended vendor functionality will not exist in case one
will bind the device to the generic vfio_pci.ko.

Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
---
drivers/vfio/pci/Kconfig | 9 +++
drivers/vfio/pci/Makefile | 3 +
drivers/vfio/pci/mlx5_vfio_pci.c | 130 +++++++++++++++++++++++++++++++
3 files changed, 142 insertions(+)
create mode 100644 drivers/vfio/pci/mlx5_vfio_pci.c

diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
index 384d06661f30..9cdef46dd299 100644
--- a/drivers/vfio/pci/Kconfig
+++ b/drivers/vfio/pci/Kconfig
@@ -48,3 +48,12 @@ config VFIO_PCI_IGD
and LPC bridge config space.

To enable Intel IGD assignment through vfio-pci, say Y.
+
+config MLX5_VFIO_PCI
+ tristate "VFIO support for MLX5 PCI devices"
+ depends on VFIO_PCI_CORE && MLX5_CORE
+ help
+ This provides a generic PCI support for MLX5 devices using the VFIO
+ framework.
+
+ If you don't know what to do here, say N.
diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
index ddba4759cde7..a0df9c2a4bd9 100644
--- a/drivers/vfio/pci/Makefile
+++ b/drivers/vfio/pci/Makefile
@@ -2,9 +2,12 @@

obj-$(CONFIG_VFIO_PCI_CORE) += vfio-pci-core.o
obj-$(CONFIG_VFIO_PCI) += vfio-pci.o
+obj-$(CONFIG_MLX5_VFIO_PCI) += mlx5-vfio-pci.o

vfio-pci-core-y := vfio_pci_core.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o
vfio-pci-core-$(CONFIG_S390) += vfio_pci_zdev.o

vfio-pci-y := vfio_pci.o
vfio-pci-$(CONFIG_VFIO_PCI_IGD) += vfio_pci_igd.o
+
+mlx5-vfio-pci-y := mlx5_vfio_pci.o
diff --git a/drivers/vfio/pci/mlx5_vfio_pci.c b/drivers/vfio/pci/mlx5_vfio_pci.c
new file mode 100644
index 000000000000..0153682a3d3f
--- /dev/null
+++ b/drivers/vfio/pci/mlx5_vfio_pci.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, Mellanox Technologies. All rights reserved.
+ * Author: Max Gurtovoy <mgurtovoy@nvidia.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/device.h>
+#include <linux/eventfd.h>
+#include <linux/file.h>
+#include <linux/interrupt.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/pci.h>
+#include <linux/pm_runtime.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <linux/sched/mm.h>
+#include <linux/mlx5/driver.h>
+
+#include <linux/vfio_pci_core.h>
+
+static int mlx5_vfio_pci_open(struct vfio_device *core_vdev)
+{
+ struct vfio_pci_core_device *vdev =
+ container_of(core_vdev, struct vfio_pci_core_device, vdev);
+ int ret;
+
+ lockdep_assert_held(&core_vdev->reflck->lock);
+
+ ret = vfio_pci_core_enable(vdev);
+ if (ret)
+ return ret;
+
+ /* TODO: register migration region here for capable devices */
+
+ vfio_pci_core_finish_enable(vdev);
+
+ return 0;
+}
+
+static const struct vfio_device_ops mlx5_vfio_pci_ops = {
+ .name = "mlx5-vfio-pci",
+ .open = mlx5_vfio_pci_open,
+ .release = vfio_pci_core_release,
+ .ioctl = vfio_pci_core_ioctl,
+ .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,
+ .reflck_attach = vfio_pci_core_reflck_attach,
+};
+
+static int mlx5_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct vfio_pci_core_device *vdev;
+ int ret;
+
+ vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+ if (!vdev)
+ return -ENOMEM;
+
+ ret = vfio_pci_core_register_device(vdev, pdev, &mlx5_vfio_pci_ops);
+ if (ret)
+ goto out_free;
+
+ dev_set_drvdata(&pdev->dev, vdev);
+ return 0;
+
+out_free:
+ kfree(vdev);
+ return ret;
+}
+
+static void mlx5_vfio_pci_remove(struct pci_dev *pdev)
+{
+ struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev);
+
+ vfio_pci_core_unregister_device(vdev);
+ kfree(vdev);
+}
+
+static const struct pci_device_id mlx5_vfio_pci_table[] = {
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_MELLANOX, 0x101b) }, /* ConnectX-6 */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_MELLANOX, 0x101c) }, /* ConnectX-6 VF */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_MELLANOX, 0x101d) }, /* ConnectX-6 Dx */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_MELLANOX, 0x101e) }, /* ConnectX Family mlx5Gen Virtual Function */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_MELLANOX, 0x101f) }, /* ConnectX-6 LX */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_MELLANOX, 0x1021) }, /* ConnectX-7 */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_MELLANOX, 0xa2d2) }, /* BlueField integrated ConnectX-5 network controller */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_MELLANOX, 0xa2d3) }, /* BlueField integrated ConnectX-5 network controller VF */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_MELLANOX, 0xa2d6) }, /* BlueField-2 integrated ConnectX-6 Dx network controller */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_MELLANOX, 0xa2dc) }, /* BlueField-3 integrated ConnectX-7 network controller */
+ { 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, mlx5_vfio_pci_table);
+
+static struct pci_driver mlx5_vfio_pci_driver = {
+ .name = "mlx5-vfio-pci",
+ .id_table = mlx5_vfio_pci_table,
+ .probe = mlx5_vfio_pci_probe,
+ .remove = mlx5_vfio_pci_remove,
+#ifdef CONFIG_PCI_IOV
+ .sriov_configure = vfio_pci_core_sriov_configure,
+#endif
+ .err_handler = &vfio_pci_core_err_handlers,
+};
+
+static void __exit mlx5_vfio_pci_cleanup(void)
+{
+ pci_unregister_driver(&mlx5_vfio_pci_driver);
+}
+
+static int __init mlx5_vfio_pci_init(void)
+{
+ return pci_register_driver(&mlx5_vfio_pci_driver);
+}
+
+module_init(mlx5_vfio_pci_init);
+module_exit(mlx5_vfio_pci_cleanup);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Max Gurtovoy <mgurtovoy@nvidia.com>");
+MODULE_DESCRIPTION("MLX5 VFIO PCI - User Level meta-driver for MLX5 device family");
--
2.21.0
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