123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144 |
- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (C) 2013 - Virtual Open Systems
- * Author: Antonios Motakis <[email protected]>
- */
- #include <linux/module.h>
- #include <linux/slab.h>
- #include <linux/vfio.h>
- #include <linux/pm_runtime.h>
- #include <linux/amba/bus.h>
- #include "vfio_platform_private.h"
- #define DRIVER_VERSION "0.10"
- #define DRIVER_AUTHOR "Antonios Motakis <[email protected]>"
- #define DRIVER_DESC "VFIO for AMBA devices - User Level meta-driver"
- /* probing devices from the AMBA bus */
- static struct resource *get_amba_resource(struct vfio_platform_device *vdev,
- int i)
- {
- struct amba_device *adev = (struct amba_device *) vdev->opaque;
- if (i == 0)
- return &adev->res;
- return NULL;
- }
- static int get_amba_irq(struct vfio_platform_device *vdev, int i)
- {
- struct amba_device *adev = (struct amba_device *) vdev->opaque;
- int ret = 0;
- if (i < AMBA_NR_IRQS)
- ret = adev->irq[i];
- /* zero is an unset IRQ for AMBA devices */
- return ret ? ret : -ENXIO;
- }
- static int vfio_amba_init_dev(struct vfio_device *core_vdev)
- {
- struct vfio_platform_device *vdev =
- container_of(core_vdev, struct vfio_platform_device, vdev);
- struct amba_device *adev = to_amba_device(core_vdev->dev);
- int ret;
- vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
- if (!vdev->name)
- return -ENOMEM;
- vdev->opaque = (void *) adev;
- vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
- vdev->get_resource = get_amba_resource;
- vdev->get_irq = get_amba_irq;
- vdev->reset_required = false;
- ret = vfio_platform_init_common(vdev);
- if (ret)
- kfree(vdev->name);
- return ret;
- }
- static const struct vfio_device_ops vfio_amba_ops;
- static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
- {
- struct vfio_platform_device *vdev;
- int ret;
- vdev = vfio_alloc_device(vfio_platform_device, vdev, &adev->dev,
- &vfio_amba_ops);
- if (IS_ERR(vdev))
- return PTR_ERR(vdev);
- ret = vfio_register_group_dev(&vdev->vdev);
- if (ret)
- goto out_put_vdev;
- pm_runtime_enable(&adev->dev);
- dev_set_drvdata(&adev->dev, vdev);
- return 0;
- out_put_vdev:
- vfio_put_device(&vdev->vdev);
- return ret;
- }
- static void vfio_amba_release_dev(struct vfio_device *core_vdev)
- {
- struct vfio_platform_device *vdev =
- container_of(core_vdev, struct vfio_platform_device, vdev);
- vfio_platform_release_common(vdev);
- kfree(vdev->name);
- vfio_free_device(core_vdev);
- }
- static void vfio_amba_remove(struct amba_device *adev)
- {
- struct vfio_platform_device *vdev = dev_get_drvdata(&adev->dev);
- vfio_unregister_group_dev(&vdev->vdev);
- pm_runtime_disable(vdev->device);
- vfio_put_device(&vdev->vdev);
- }
- static const struct vfio_device_ops vfio_amba_ops = {
- .name = "vfio-amba",
- .init = vfio_amba_init_dev,
- .release = vfio_amba_release_dev,
- .open_device = vfio_platform_open_device,
- .close_device = vfio_platform_close_device,
- .ioctl = vfio_platform_ioctl,
- .read = vfio_platform_read,
- .write = vfio_platform_write,
- .mmap = vfio_platform_mmap,
- };
- static const struct amba_id pl330_ids[] = {
- { 0, 0 },
- };
- MODULE_DEVICE_TABLE(amba, pl330_ids);
- static struct amba_driver vfio_amba_driver = {
- .probe = vfio_amba_probe,
- .remove = vfio_amba_remove,
- .id_table = pl330_ids,
- .drv = {
- .name = "vfio-amba",
- .owner = THIS_MODULE,
- },
- .driver_managed_dma = true,
- };
- module_amba_driver(vfio_amba_driver);
- MODULE_VERSION(DRIVER_VERSION);
- MODULE_LICENSE("GPL v2");
- MODULE_AUTHOR(DRIVER_AUTHOR);
- MODULE_DESCRIPTION(DRIVER_DESC);
|