147 lines
3.5 KiB
C
147 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/amba/bus.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 AMBA devices - User Level meta-driver"
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/* probing devices from the AMBA bus */
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static struct resource *get_amba_resource(struct vfio_platform_device *vdev,
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int i)
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{
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struct amba_device *adev = (struct amba_device *) vdev->opaque;
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if (i == 0)
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return &adev->res;
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return NULL;
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}
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static int get_amba_irq(struct vfio_platform_device *vdev, int i)
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{
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struct amba_device *adev = (struct amba_device *) vdev->opaque;
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int ret = 0;
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if (i < AMBA_NR_IRQS)
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ret = adev->irq[i];
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/* zero is an unset IRQ for AMBA devices */
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return ret ? ret : -ENXIO;
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}
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static int vfio_amba_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 amba_device *adev = to_amba_device(core_vdev->dev);
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int ret;
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vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
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if (!vdev->name)
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return -ENOMEM;
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vdev->opaque = (void *) adev;
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vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
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vdev->get_resource = get_amba_resource;
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vdev->get_irq = get_amba_irq;
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vdev->reset_required = false;
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ret = vfio_platform_init_common(vdev);
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if (ret)
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kfree(vdev->name);
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return ret;
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}
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static const struct vfio_device_ops vfio_amba_ops;
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static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
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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, &adev->dev,
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&vfio_amba_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(&adev->dev);
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dev_set_drvdata(&adev->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_amba_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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kfree(vdev->name);
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}
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static void vfio_amba_remove(struct amba_device *adev)
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{
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struct vfio_platform_device *vdev = dev_get_drvdata(&adev->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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}
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static const struct vfio_device_ops vfio_amba_ops = {
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.name = "vfio-amba",
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.init = vfio_amba_init_dev,
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.release = vfio_amba_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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};
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static const struct amba_id pl330_ids[] = {
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{ 0, 0 },
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};
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MODULE_DEVICE_TABLE(amba, pl330_ids);
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static struct amba_driver vfio_amba_driver = {
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.probe = vfio_amba_probe,
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.remove = vfio_amba_remove,
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.id_table = pl330_ids,
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.drv = {
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.name = "vfio-amba",
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.owner = THIS_MODULE,
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},
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.driver_managed_dma = true,
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};
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module_amba_driver(vfio_amba_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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