129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2013 - Virtual Open Systems
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* Author: Antonios Motakis <a.motakis@virtualopensystems.com>
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/vfio.h>
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#include <linux/pm_runtime.h>
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#include <linux/platform_device.h>
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#include "vfio_platform_private.h"
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#define DRIVER_VERSION "0.10"
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#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
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#define DRIVER_DESC "VFIO for platform devices - User Level meta-driver"
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static bool reset_required = true;
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module_param(reset_required, bool, 0444);
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MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)");
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/* probing devices from the linux platform bus */
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static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
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int num)
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{
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struct platform_device *dev = (struct platform_device *) vdev->opaque;
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return platform_get_mem_or_io(dev, num);
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}
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static int get_platform_irq(struct vfio_platform_device *vdev, int i)
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{
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struct platform_device *pdev = (struct platform_device *) vdev->opaque;
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return platform_get_irq_optional(pdev, i);
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}
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static int vfio_platform_init_dev(struct vfio_device *core_vdev)
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{
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struct vfio_platform_device *vdev =
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container_of(core_vdev, struct vfio_platform_device, vdev);
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struct platform_device *pdev = to_platform_device(core_vdev->dev);
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vdev->opaque = (void *) pdev;
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vdev->name = pdev->name;
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vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
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vdev->get_resource = get_platform_resource;
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vdev->get_irq = get_platform_irq;
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vdev->reset_required = reset_required;
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return vfio_platform_init_common(vdev);
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}
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static const struct vfio_device_ops vfio_platform_ops;
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static int vfio_platform_probe(struct platform_device *pdev)
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{
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struct vfio_platform_device *vdev;
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int ret;
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vdev = vfio_alloc_device(vfio_platform_device, vdev, &pdev->dev,
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&vfio_platform_ops);
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if (IS_ERR(vdev))
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return PTR_ERR(vdev);
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ret = vfio_register_group_dev(&vdev->vdev);
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if (ret)
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goto out_put_vdev;
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pm_runtime_enable(&pdev->dev);
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dev_set_drvdata(&pdev->dev, vdev);
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return 0;
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out_put_vdev:
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vfio_put_device(&vdev->vdev);
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return ret;
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}
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static void vfio_platform_release_dev(struct vfio_device *core_vdev)
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{
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struct vfio_platform_device *vdev =
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container_of(core_vdev, struct vfio_platform_device, vdev);
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vfio_platform_release_common(vdev);
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}
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static int vfio_platform_remove(struct platform_device *pdev)
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{
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struct vfio_platform_device *vdev = dev_get_drvdata(&pdev->dev);
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vfio_unregister_group_dev(&vdev->vdev);
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pm_runtime_disable(vdev->device);
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vfio_put_device(&vdev->vdev);
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return 0;
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}
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static const struct vfio_device_ops vfio_platform_ops = {
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.name = "vfio-platform",
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.init = vfio_platform_init_dev,
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.release = vfio_platform_release_dev,
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.open_device = vfio_platform_open_device,
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.close_device = vfio_platform_close_device,
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.ioctl = vfio_platform_ioctl,
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.read = vfio_platform_read,
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.write = vfio_platform_write,
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.mmap = vfio_platform_mmap,
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.bind_iommufd = vfio_iommufd_physical_bind,
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.unbind_iommufd = vfio_iommufd_physical_unbind,
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.attach_ioas = vfio_iommufd_physical_attach_ioas,
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.detach_ioas = vfio_iommufd_physical_detach_ioas,
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};
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static struct platform_driver vfio_platform_driver = {
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.probe = vfio_platform_probe,
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.remove = vfio_platform_remove,
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.driver = {
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.name = "vfio-platform",
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},
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.driver_managed_dma = true,
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};
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module_platform_driver(vfio_platform_driver);
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MODULE_VERSION(DRIVER_VERSION);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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