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// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
* Copyright 2013-2016 Freescale Semiconductor Inc.
* Copyright 2016-2017,2019-2020 NXP
*/
#include <linux/device.h>
#include <linux/iommu.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/vfio.h>
#include <linux/fsl/mc.h>
#include "vfio_fsl_mc_private.h"
static struct fsl_mc_driver vfio_fsl_mc_driver;
static int vfio_fsl_mc_open(void *device_data)
{
if (!try_module_get(THIS_MODULE))
return -ENODEV;
return 0;
}
static void vfio_fsl_mc_release(void *device_data)
{
module_put(THIS_MODULE);
}
static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
unsigned long arg)
{
switch (cmd) {
case VFIO_DEVICE_GET_INFO:
{
return -ENOTTY;
}
case VFIO_DEVICE_GET_REGION_INFO:
{
return -ENOTTY;
}
case VFIO_DEVICE_GET_IRQ_INFO:
{
return -ENOTTY;
}
case VFIO_DEVICE_SET_IRQS:
{
return -ENOTTY;
}
case VFIO_DEVICE_RESET:
{
return -ENOTTY;
}
default:
return -ENOTTY;
}
}
static ssize_t vfio_fsl_mc_read(void *device_data, char __user *buf,
size_t count, loff_t *ppos)
{
return -EINVAL;
}
static ssize_t vfio_fsl_mc_write(void *device_data, const char __user *buf,
size_t count, loff_t *ppos)
{
return -EINVAL;
}
static int vfio_fsl_mc_mmap(void *device_data, struct vm_area_struct *vma)
{
return -EINVAL;
}
static const struct vfio_device_ops vfio_fsl_mc_ops = {
.name = "vfio-fsl-mc",
.open = vfio_fsl_mc_open,
.release = vfio_fsl_mc_release,
.ioctl = vfio_fsl_mc_ioctl,
.read = vfio_fsl_mc_read,
.write = vfio_fsl_mc_write,
.mmap = vfio_fsl_mc_mmap,
};
static int vfio_fsl_mc_bus_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct vfio_fsl_mc_device *vdev = container_of(nb,
struct vfio_fsl_mc_device, nb);
struct device *dev = data;
struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
struct fsl_mc_device *mc_cont = to_fsl_mc_device(mc_dev->dev.parent);
if (action == BUS_NOTIFY_ADD_DEVICE &&
vdev->mc_dev == mc_cont) {
mc_dev->driver_override = kasprintf(GFP_KERNEL, "%s",
vfio_fsl_mc_ops.name);
if (!mc_dev->driver_override)
dev_warn(dev, "VFIO_FSL_MC: Setting driver override for device in dprc %s failed\n",
dev_name(&mc_cont->dev));
else
dev_info(dev, "VFIO_FSL_MC: Setting driver override for device in dprc %s\n",
dev_name(&mc_cont->dev));
} else if (action == BUS_NOTIFY_BOUND_DRIVER &&
vdev->mc_dev == mc_cont) {
struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(dev->driver);
if (mc_drv && mc_drv != &vfio_fsl_mc_driver)
dev_warn(dev, "VFIO_FSL_MC: Object %s bound to driver %s while DPRC bound to vfio-fsl-mc\n",
dev_name(dev), mc_drv->driver.name);
}
return 0;
}
static int vfio_fsl_mc_init_device(struct vfio_fsl_mc_device *vdev)
{
struct fsl_mc_device *mc_dev = vdev->mc_dev;
int ret;
/* Non-dprc devices share mc_io from parent */
if (!is_fsl_mc_bus_dprc(mc_dev)) {
struct fsl_mc_device *mc_cont = to_fsl_mc_device(mc_dev->dev.parent);
mc_dev->mc_io = mc_cont->mc_io;
return 0;
}
vdev->nb.notifier_call = vfio_fsl_mc_bus_notifier;
ret = bus_register_notifier(&fsl_mc_bus_type, &vdev->nb);
if (ret)
return ret;
/* open DPRC, allocate a MC portal */
ret = dprc_setup(mc_dev);
if (ret) {
dev_err(&mc_dev->dev, "VFIO_FSL_MC: Failed to setup DPRC (%d)\n", ret);
goto out_nc_unreg;
}
ret = dprc_scan_container(mc_dev, false);
if (ret) {
dev_err(&mc_dev->dev, "VFIO_FSL_MC: Container scanning failed (%d)\n", ret);
goto out_dprc_cleanup;
}
return 0;
out_dprc_cleanup:
dprc_remove_devices(mc_dev, NULL, 0);
dprc_cleanup(mc_dev);
out_nc_unreg:
bus_unregister_notifier(&fsl_mc_bus_type, &vdev->nb);
vdev->nb.notifier_call = NULL;
return ret;
}
static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
{
struct iommu_group *group;
struct vfio_fsl_mc_device *vdev;
struct device *dev = &mc_dev->dev;
int ret;
group = vfio_iommu_group_get(dev);
if (!group) {
dev_err(dev, "VFIO_FSL_MC: No IOMMU group\n");
return -EINVAL;
}
vdev = devm_kzalloc(dev, sizeof(*vdev), GFP_KERNEL);
if (!vdev) {
ret = -ENOMEM;
goto out_group_put;
}
vdev->mc_dev = mc_dev;
ret = vfio_add_group_dev(dev, &vfio_fsl_mc_ops, vdev);
if (ret) {
dev_err(dev, "VFIO_FSL_MC: Failed to add to vfio group\n");
goto out_group_put;
}
ret = vfio_fsl_mc_init_device(vdev);
if (ret)
goto out_group_dev;
return 0;
out_group_dev:
vfio_del_group_dev(dev);
out_group_put:
vfio_iommu_group_put(group, dev);
return ret;
}
static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
{
struct vfio_fsl_mc_device *vdev;
struct device *dev = &mc_dev->dev;
vdev = vfio_del_group_dev(dev);
if (!vdev)
return -EINVAL;
if (is_fsl_mc_bus_dprc(mc_dev)) {
dprc_remove_devices(mc_dev, NULL, 0);
dprc_cleanup(mc_dev);
}
if (vdev->nb.notifier_call)
bus_unregister_notifier(&fsl_mc_bus_type, &vdev->nb);
vfio_iommu_group_put(mc_dev->dev.iommu_group, dev);
return 0;
}
static struct fsl_mc_driver vfio_fsl_mc_driver = {
.probe = vfio_fsl_mc_probe,
.remove = vfio_fsl_mc_remove,
.driver = {
.name = "vfio-fsl-mc",
.owner = THIS_MODULE,
},
};
static int __init vfio_fsl_mc_driver_init(void)
{
return fsl_mc_driver_register(&vfio_fsl_mc_driver);
}
static void __exit vfio_fsl_mc_driver_exit(void)
{
fsl_mc_driver_unregister(&vfio_fsl_mc_driver);
}
module_init(vfio_fsl_mc_driver_init);
module_exit(vfio_fsl_mc_driver_exit);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("VFIO for FSL-MC devices - User Level meta-driver");
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