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Date: Tue, 6 Dec 2022 13:58:13 +0800
From: Lei Rao <lei.rao@...el.com>
To: kbusch@...nel.org, axboe@...com, kch@...dia.com, hch@....de,
sagi@...mberg.me, alex.williamson@...hat.com, cohuck@...hat.com,
jgg@...pe.ca, yishaih@...dia.com,
shameerali.kolothum.thodi@...wei.com, kevin.tian@...el.com,
mjrosato@...ux.ibm.com, linux-kernel@...r.kernel.org,
linux-nvme@...ts.infradead.org, kvm@...r.kernel.org
Cc: eddie.dong@...el.com, yadong.li@...el.com, yi.l.liu@...el.com,
Konrad.wilk@...cle.com, stephen@...eticom.com, hang.yuan@...el.com,
Lei Rao <lei.rao@...el.com>
Subject: [RFC PATCH 2/5] nvme-vfio: add new vfio-pci driver for NVMe device
NVMe device has specific live migration implementation.
Add an specific VFIO PCI driver for NVMe device. Its
live migration support will be added in the subsequent
patches.
Signed-off-by: Lei Rao <lei.rao@...el.com>
Signed-off-by: Yadong Li <yadong.li@...el.com>
Signed-off-by: Chaitanya Kulkarni <kch@...dia.com>
Reviewed-by: Eddie Dong <eddie.dong@...el.com>
Reviewed-by: Hang Yuan <hang.yuan@...el.com>
---
drivers/vfio/pci/Kconfig | 2 +
drivers/vfio/pci/Makefile | 2 +
drivers/vfio/pci/nvme/Kconfig | 9 ++++
drivers/vfio/pci/nvme/Makefile | 3 ++
drivers/vfio/pci/nvme/nvme.c | 99 ++++++++++++++++++++++++++++++++++
5 files changed, 115 insertions(+)
create mode 100644 drivers/vfio/pci/nvme/Kconfig
create mode 100644 drivers/vfio/pci/nvme/Makefile
create mode 100644 drivers/vfio/pci/nvme/nvme.c
diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
index f9d0c908e738..fcd45144d3e3 100644
--- a/drivers/vfio/pci/Kconfig
+++ b/drivers/vfio/pci/Kconfig
@@ -59,4 +59,6 @@ source "drivers/vfio/pci/mlx5/Kconfig"
source "drivers/vfio/pci/hisilicon/Kconfig"
+source "drivers/vfio/pci/nvme/Kconfig"
+
endif
diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
index 24c524224da5..eddc8e889726 100644
--- 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_NVME_VFIO_PCI) += nvme/
diff --git a/drivers/vfio/pci/nvme/Kconfig b/drivers/vfio/pci/nvme/Kconfig
new file mode 100644
index 000000000000..c281fe154007
--- /dev/null
+++ b/drivers/vfio/pci/nvme/Kconfig
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config NVME_VFIO_PCI
+ tristate "VFIO support for NVMe PCI devices"
+ depends on VFIO_PCI_CORE
+ help
+ This provides generic VFIO PCI support for NVMe device
+ using the VFIO framework.
+
+ If you don't know what to do here, say N.
diff --git a/drivers/vfio/pci/nvme/Makefile b/drivers/vfio/pci/nvme/Makefile
new file mode 100644
index 000000000000..2f4a0ad3d9cf
--- /dev/null
+++ b/drivers/vfio/pci/nvme/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_NVME_VFIO_PCI) += nvme-vfio-pci.o
+nvme-vfio-pci-y := nvme.o
diff --git a/drivers/vfio/pci/nvme/nvme.c b/drivers/vfio/pci/nvme/nvme.c
new file mode 100644
index 000000000000..f1386d8a9287
--- /dev/null
+++ b/drivers/vfio/pci/nvme/nvme.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022, INTEL CORPORATION. All rights reserved
+ */
+
+#include <linux/device.h>
+#include <linux/eventfd.h>
+#include <linux/file.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+#include <linux/vfio.h>
+#include <linux/anon_inodes.h>
+#include <linux/kernel.h>
+#include <linux/vfio_pci_core.h>
+
+static int nvmevf_pci_open_device(struct vfio_device *core_vdev)
+{
+ struct vfio_pci_core_device *vdev =
+ container_of(core_vdev, struct vfio_pci_core_device, vdev);
+ int ret;
+
+ ret = vfio_pci_core_enable(vdev);
+ if (ret)
+ return ret;
+
+ vfio_pci_core_finish_enable(vdev);
+ return 0;
+}
+
+static const struct vfio_device_ops nvmevf_pci_ops = {
+ .name = "nvme-vfio-pci",
+ .init = vfio_pci_core_init_dev,
+ .release = vfio_pci_core_release_dev,
+ .open_device = nvmevf_pci_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,
+};
+
+static int nvmevf_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct vfio_pci_core_device *vdev;
+ int ret;
+
+ vdev = vfio_alloc_device(vfio_pci_core_device, vdev, &pdev->dev,
+ &nvmevf_pci_ops);
+ if (IS_ERR(vdev))
+ return PTR_ERR(vdev);
+
+ dev_set_drvdata(&pdev->dev, vdev);
+ ret = vfio_pci_core_register_device(vdev);
+ if (ret)
+ goto out_put_dev;
+
+ return 0;
+
+out_put_dev:
+ vfio_put_device(&vdev->vdev);
+ return ret;
+}
+
+static void nvmevf_pci_remove(struct pci_dev *pdev)
+{
+ struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev);
+
+ vfio_pci_core_unregister_device(vdev);
+ vfio_put_device(&vdev->vdev);
+}
+
+static const struct pci_device_id nvmevf_pci_table[] = {
+ /* Intel IPU NVMe Virtual Function */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x1457) },
+ {}
+};
+
+MODULE_DEVICE_TABLE(pci, nvmevf_pci_table);
+
+static struct pci_driver nvmevf_pci_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = nvmevf_pci_table,
+ .probe = nvmevf_pci_probe,
+ .remove = nvmevf_pci_remove,
+ .err_handler = &vfio_pci_core_err_handlers,
+ .driver_managed_dma = true,
+};
+
+module_pci_driver(nvmevf_pci_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Lei Rao <lei.rao@...el.com>");
+MODULE_DESCRIPTION("NVMe VFIO PCI - Generic VFIO PCI driver for NVMe");
--
2.34.1
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