cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vfio_amba.c (2351B)

      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->reset_required = false;
     63
     64	ret = vfio_platform_probe_common(vdev, &adev->dev);
     65	if (ret) {
     66		kfree(vdev->name);
     67		kfree(vdev);
     68		return ret;
     69	}
     70
     71	dev_set_drvdata(&adev->dev, vdev);
     72	return 0;
     73}
     74
     75static void vfio_amba_remove(struct amba_device *adev)
     76{
     77	struct vfio_platform_device *vdev = dev_get_drvdata(&adev->dev);
     78
     79	vfio_platform_remove_common(vdev);
     80	kfree(vdev->name);
     81	kfree(vdev);
     82}
     83
     84static const struct amba_id pl330_ids[] = {
     85	{ 0, 0 },
     86};
     87
     88MODULE_DEVICE_TABLE(amba, pl330_ids);
     89
     90static struct amba_driver vfio_amba_driver = {
     91	.probe = vfio_amba_probe,
     92	.remove = vfio_amba_remove,
     93	.id_table = pl330_ids,
     94	.drv = {
     95		.name = "vfio-amba",
     96		.owner = THIS_MODULE,
     97	},
     98	.driver_managed_dma = true,
     99};
    100
    101module_amba_driver(vfio_amba_driver);
    102
    103MODULE_VERSION(DRIVER_VERSION);
    104MODULE_LICENSE("GPL v2");
    105MODULE_AUTHOR(DRIVER_AUTHOR);
    106MODULE_DESCRIPTION(DRIVER_DESC);