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Groups > linux.kernel > #1523838
| From | Kirti Wankhede <kwankhede@nvidia.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v14 02/22] vfio: VFIO based driver for Mediated devices |
| Date | 2016-11-16 22:00 +0100 |
| Message-ID | <sEftg-7M4-29@gated-at.bofh.it> (permalink) |
| References | <sEfjz-7Ip-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
vfio_mdev driver registers with mdev core driver.
mdev core driver creates mediated device and calls probe routine of
vfio_mdev driver for each device.
Probe routine of vfio_mdev driver adds mediated device to VFIO core module
This driver forms a shim layer that pass through VFIO devices operations
to vendor driver for mediated devices.
Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Neo Jia <cjia@nvidia.com>
Reviewed-by: Jike Song <jike.song@intel.com>
Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Change-Id: I583f4734752971d3d112324d69e2508c88f359ec
---
drivers/vfio/mdev/Kconfig | 7 ++
drivers/vfio/mdev/Makefile | 1 +
drivers/vfio/mdev/mdev_core.c | 13 +++-
drivers/vfio/mdev/vfio_mdev.c | 148 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 168 insertions(+), 1 deletion(-)
create mode 100644 drivers/vfio/mdev/vfio_mdev.c
diff --git a/drivers/vfio/mdev/Kconfig b/drivers/vfio/mdev/Kconfig
index 258481d65ebd..424ddebee55d 100644
--- a/drivers/vfio/mdev/Kconfig
+++ b/drivers/vfio/mdev/Kconfig
@@ -7,3 +7,10 @@ config VFIO_MDEV
Provides a framework to virtualize devices.
If you don't know what do here, say N.
+
+config VFIO_MDEV_DEVICE
+ tristate "VFIO driver for Mediated devices"
+ depends on VFIO && VFIO_MDEV
+ default n
+ help
+ VFIO based driver for Mediated devices.
diff --git a/drivers/vfio/mdev/Makefile b/drivers/vfio/mdev/Makefile
index 31bc04801d94..fa2d5ea466ee 100644
--- a/drivers/vfio/mdev/Makefile
+++ b/drivers/vfio/mdev/Makefile
@@ -2,3 +2,4 @@
mdev-y := mdev_core.o mdev_sysfs.o mdev_driver.o
obj-$(CONFIG_VFIO_MDEV) += mdev.o
+obj-$(CONFIG_VFIO_MDEV_DEVICE) += vfio_mdev.o
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 613e8a8a3b2a..be1ee89ee917 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -354,7 +354,18 @@ int mdev_device_remove(struct device *dev, bool force_remove)
static int __init mdev_init(void)
{
- return mdev_bus_register();
+ int ret;
+
+ ret = mdev_bus_register();
+
+ /*
+ * Attempt to load known vfio_mdev. This gives us a working environment
+ * without the user needing to explicitly load vfio_mdev driver.
+ */
+ if (!ret)
+ request_module_nowait("vfio_mdev");
+
+ return ret;
}
static void __exit mdev_exit(void)
diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
new file mode 100644
index 000000000000..ffc36758cb84
--- /dev/null
+++ b/drivers/vfio/mdev/vfio_mdev.c
@@ -0,0 +1,148 @@
+/*
+ * VFIO based driver for Mediated device
+ *
+ * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+ * Author: Neo Jia <cjia@nvidia.com>
+ * Kirti Wankhede <kwankhede@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/vfio.h>
+#include <linux/mdev.h>
+
+#include "mdev_private.h"
+
+#define DRIVER_VERSION "0.1"
+#define DRIVER_AUTHOR "NVIDIA Corporation"
+#define DRIVER_DESC "VFIO based driver for Mediated device"
+
+static int vfio_mdev_open(void *device_data)
+{
+ struct mdev_device *mdev = device_data;
+ struct parent_device *parent = mdev->parent;
+ int ret;
+
+ if (unlikely(!parent->ops->open))
+ return -EINVAL;
+
+ if (!try_module_get(THIS_MODULE))
+ return -ENODEV;
+
+ ret = parent->ops->open(mdev);
+ if (ret)
+ module_put(THIS_MODULE);
+
+ return ret;
+}
+
+static void vfio_mdev_release(void *device_data)
+{
+ struct mdev_device *mdev = device_data;
+ struct parent_device *parent = mdev->parent;
+
+ if (likely(parent->ops->release))
+ parent->ops->release(mdev);
+
+ module_put(THIS_MODULE);
+}
+
+static long vfio_mdev_unlocked_ioctl(void *device_data,
+ unsigned int cmd, unsigned long arg)
+{
+ struct mdev_device *mdev = device_data;
+ struct parent_device *parent = mdev->parent;
+
+ if (unlikely(!parent->ops->ioctl))
+ return -EINVAL;
+
+ return parent->ops->ioctl(mdev, cmd, arg);
+}
+
+static ssize_t vfio_mdev_read(void *device_data, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct mdev_device *mdev = device_data;
+ struct parent_device *parent = mdev->parent;
+
+ if (unlikely(!parent->ops->read))
+ return -EINVAL;
+
+ return parent->ops->read(mdev, buf, count, ppos);
+}
+
+static ssize_t vfio_mdev_write(void *device_data, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct mdev_device *mdev = device_data;
+ struct parent_device *parent = mdev->parent;
+
+ if (unlikely(!parent->ops->write))
+ return -EINVAL;
+
+ return parent->ops->write(mdev, buf, count, ppos);
+}
+
+static int vfio_mdev_mmap(void *device_data, struct vm_area_struct *vma)
+{
+ struct mdev_device *mdev = device_data;
+ struct parent_device *parent = mdev->parent;
+
+ if (unlikely(!parent->ops->mmap))
+ return -EINVAL;
+
+ return parent->ops->mmap(mdev, vma);
+}
+
+static const struct vfio_device_ops vfio_mdev_dev_ops = {
+ .name = "vfio-mdev",
+ .open = vfio_mdev_open,
+ .release = vfio_mdev_release,
+ .ioctl = vfio_mdev_unlocked_ioctl,
+ .read = vfio_mdev_read,
+ .write = vfio_mdev_write,
+ .mmap = vfio_mdev_mmap,
+};
+
+int vfio_mdev_probe(struct device *dev)
+{
+ struct mdev_device *mdev = to_mdev_device(dev);
+
+ return vfio_add_group_dev(dev, &vfio_mdev_dev_ops, mdev);
+}
+
+void vfio_mdev_remove(struct device *dev)
+{
+ vfio_del_group_dev(dev);
+}
+
+struct mdev_driver vfio_mdev_driver = {
+ .name = "vfio_mdev",
+ .probe = vfio_mdev_probe,
+ .remove = vfio_mdev_remove,
+};
+
+static int __init vfio_mdev_init(void)
+{
+ return mdev_register_driver(&vfio_mdev_driver, THIS_MODULE);
+}
+
+static void __exit vfio_mdev_exit(void)
+{
+ mdev_unregister_driver(&vfio_mdev_driver);
+}
+
+module_init(vfio_mdev_init)
+module_exit(vfio_mdev_exit)
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
--
2.7.0
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[PATCH v14 00/22] Add Mediated device support Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 21:50 +0100
[PATCH v14 11/22] vfio iommu: Add blocking notifier to notify DMA_UNMAP Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 21:50 +0100
Re: [PATCH v14 11/22] vfio iommu: Add blocking notifier to notify DMA_UNMAP Alex Williamson <alex.williamson@redhat.com> - 2016-11-17 01:10 +0100
Re: [PATCH v14 11/22] vfio iommu: Add blocking notifier to notify DMA_UNMAP Jike Song <jike.song@intel.com> - 2016-11-17 04:00 +0100
Re: [PATCH v14 11/22] vfio iommu: Add blocking notifier to notify DMA_UNMAP Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-17 06:00 +0100
[PATCH v14 18/22] vfio: Define device_api strings Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 21:50 +0100
[PATCH v14 09/22] vfio iommu type1: Add task structure to vfio_dma Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 21:50 +0100
Re: [PATCH v14 09/22] vfio iommu type1: Add task structure to vfio_dma Alexey Kardashevskiy <aik@ozlabs.ru> - 2016-11-17 06:50 +0100
Re: [PATCH v14 09/22] vfio iommu type1: Add task structure to vfio_dma Alex Williamson <alex.williamson@redhat.com> - 2016-11-17 07:20 +0100
Re: [PATCH v14 09/22] vfio iommu type1: Add task structure to vfio_dma Alexey Kardashevskiy <aik@ozlabs.ru> - 2016-11-17 07:50 +0100
Re: [PATCH v14 09/22] vfio iommu type1: Add task structure to vfio_dma Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-17 07:30 +0100
[PATCH v14 07/22] vfio iommu type1: Update argument of vaddr_get_pfn() Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 21:50 +0100
[PATCH v14 20/22] docs: Sysfs ABI for mediated device framework Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 21:50 +0100
[PATCH v14 13/22] vfio: Introduce common function to add capabilities Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 21:50 +0100
Re: [Qemu-devel] [PATCH v14 13/22] vfio: Introduce common function to add capabilities Auger Eric <eric.auger@redhat.com> - 2016-11-21 12:10 +0100
[PATCH v14 01/22] vfio: Mediated device Core driver Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 21:50 +0100
[PATCH v14 03/22] vfio: Rearrange functions to get vfio_group from dev Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 22:00 +0100
[PATCH v14 08/22] vfio iommu type1: Add find_iommu_group() function Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 22:00 +0100
Re: [PATCH v14 08/22] vfio iommu type1: Add find_iommu_group() function Auger Eric <eric.auger@redhat.com> - 2016-11-21 12:30 +0100
Re: [PATCH v14 08/22] vfio iommu type1: Add find_iommu_group() function Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-21 13:00 +0100
Re: [PATCH v14 08/22] vfio iommu type1: Add find_iommu_group() function Auger Eric <eric.auger@redhat.com> - 2016-11-21 13:50 +0100
[PATCH v14 02/22] vfio: VFIO based driver for Mediated devices Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 22:00 +0100
[PATCH v14 12/22] vfio: Add notifier callback to parent's ops structure of mdev Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 22:00 +0100
Re: [PATCH v14 12/22] vfio: Add notifier callback to parent's ops structure of mdev Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-17 06:10 +0100
Re: [PATCH v14 12/22] vfio: Add notifier callback to parent's ops structure of mdev Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-17 06:10 +0100
Re: [PATCH v14 12/22] vfio: Add notifier callback to parent's ops structure of mdev Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-17 18:30 +0100
Re: [PATCH v14 12/22] vfio: Add notifier callback to parent's ops structure of mdev Alex Williamson <alex.williamson@redhat.com> - 2016-11-17 18:40 +0100
Re: [PATCH v14 12/22] vfio: Add notifier callback to parent's ops structure of mdev Jike Song <jike.song@intel.com> - 2016-11-17 18:40 +0100
Re: [PATCH v14 12/22] vfio: Add notifier callback to parent's ops structure of mdev Alex Williamson <alex.williamson@redhat.com> - 2016-11-17 19:00 +0100
[PATCH v14 04/22] vfio: Common function to increment container_users Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-16 22:00 +0100
Re: [PATCH v14 00/22] Add Mediated device support Alex Williamson <alex.williamson@redhat.com> - 2016-11-17 22:30 +0100
Re: [PATCH v14 00/22] Add Mediated device support Neo Jia <cjia@nvidia.com> - 2016-11-17 23:20 +0100
Re: [PATCH v14 00/22] Add Mediated device support Kirti Wankhede <kwankhede@nvidia.com> - 2016-11-18 03:10 +0100
Re: [Qemu-devel] [PATCH v14 00/22] Add Mediated device support Jike Song <jike.song@intel.com> - 2016-11-18 03:30 +0100
RE: [PATCH v14 00/22] Add Mediated device support "Tian, Kevin" <kevin.tian@intel.com> - 2016-11-18 00:30 +0100
Re: [PATCH v14 00/22] Add Mediated device support Alex Williamson <alex.williamson@redhat.com> - 2016-11-18 01:00 +0100
Re: [PATCH v14 00/22] Add Mediated device support Zhenyu Wang <zhenyuw@linux.intel.com> - 2016-11-18 10:30 +0100
Re: [PATCH v14 00/22] Add Mediated device support Alex Williamson <alex.williamson@redhat.com> - 2016-11-18 16:50 +0100
Re: [PATCH v14 00/22] Add Mediated device support Daniel Vetter <daniel@ffwll.ch> - 2016-11-18 17:20 +0100
Re: [PATCH v14 00/22] Add Mediated device support Alex Williamson <alex.williamson@redhat.com> - 2016-11-18 18:00 +0100
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