LXR linux/drivers/vfio/platform/vfio

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2013 - Virtual Open Systems
   4 * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
   5 */
   6
   7#include <linux/module.h>
   8#include <linux/slab.h>
   9#include <linux/vfio.h>
  10#include <linux/amba/bus.h>
  11
  12#include "vfio_platform_private.h"
  13
  14#define DRIVER_VERSION  "0.10"
  15#define DRIVER_AUTHOR   "Antonios Motakis <a.motakis@virtualopensystems.com>"
  16#define DRIVER_DESC     "VFIO for AMBA devices - User Level meta-driver"
  17
  18/* probing devices from the AMBA bus */
  19
  20static struct resource *get_amba_resource(struct vfio_platform_device *vdev,
  21                                          int i)
  22{
  23        struct amba_device *adev = (struct amba_device *) vdev->opaque;
  24
  25        if (i == 0)
  26                return &adev->res;
  27
  28        return NULL;
  29}
  30
  31static int get_amba_irq(struct vfio_platform_device *vdev, int i)
  32{
  33        struct amba_device *adev = (struct amba_device *) vdev->opaque;
  34        int ret = 0;
  35
  36        if (i < AMBA_NR_IRQS)
  37                ret = adev->irq[i];
  38
  39        /* zero is an unset IRQ for AMBA devices */
  40        return ret ? ret : -ENXIO;
  41}
  42
  43static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
  44{
  45        struct vfio_platform_device *vdev;
  46        int ret;
  47
  48        vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
  49        if (!vdev)
  50                return -ENOMEM;
  51
  52        vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
  53        if (!vdev->name) {
  54                kfree(vdev);
  55                return -ENOMEM;
  56        }
  57
  58        vdev->opaque = (void *) adev;
  59        vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
  60        vdev->get_resource = get_amba_resource;
  61        vdev->get_irq = get_amba_irq;
  62        vdev->parent_module = THIS_MODULE;
  63        vdev->reset_required = false;
  64
  65        ret = vfio_platform_probe_common(vdev, &adev->dev);
  66        if (ret) {
  67                kfree(vdev->name);
  68                kfree(vdev);
  69        }
  70
  71        return ret;
  72}
  73
  74static int vfio_amba_remove(struct amba_device *adev)
  75{
  76        struct vfio_platform_device *vdev;
  77
  78        vdev = vfio_platform_remove_common(&adev->dev);
  79        if (vdev) {
  80                kfree(vdev->name);
  81                kfree(vdev);
  82                return 0;
  83        }
  84
  85        return -EINVAL;
  86}
  87
  88static const struct amba_id pl330_ids[] = {
  89        { 0, 0 },
  90};
  91
  92MODULE_DEVICE_TABLE(amba, pl330_ids);
  93
  94static struct amba_driver vfio_amba_driver = {
  95        .probe = vfio_amba_probe,
  96        .remove = vfio_amba_remove,
  97        .id_table = pl330_ids,
  98        .drv = {
  99                .name = "vfio-amba",
 100                .owner = THIS_MODULE,
 101        },
 102};
 103
 104module_amba_driver(vfio_amba_driver);
 105
 106MODULE_VERSION(DRIVER_VERSION);
 107MODULE_LICENSE("GPL v2");
 108MODULE_AUTHOR(DRIVER_AUTHOR);
 109MODULE_DESCRIPTION(DRIVER_DESC);
 110