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de49fc0d99
This patch forms the common skeleton code for platform devices support with VFIO. This will include the core functionality of VFIO_PLATFORM, however binding to the device and discovering the device resources will be done with the help of a separate file where any Linux platform bus specific code will reside. This will allow us to implement support for also discovering AMBA devices and their resources, but still reuse a large part of the VFIO_PLATFORM implementation. Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com> [Baptiste Reynal: added includes in vfio_platform_private.h] Signed-off-by: Baptiste Reynal <b.reynal@virtualopensystems.com> Reviewed-by: Eric Auger <eric.auger@linaro.org> Tested-by: Eric Auger <eric.auger@linaro.org> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/iommu.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/vfio.h>
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#include "vfio_platform_private.h"
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static void vfio_platform_release(void *device_data)
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{
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module_put(THIS_MODULE);
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}
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static int vfio_platform_open(void *device_data)
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{
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if (!try_module_get(THIS_MODULE))
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return -ENODEV;
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return 0;
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}
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static long vfio_platform_ioctl(void *device_data,
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unsigned int cmd, unsigned long arg)
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{
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if (cmd == VFIO_DEVICE_GET_INFO)
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return -EINVAL;
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else if (cmd == VFIO_DEVICE_GET_REGION_INFO)
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return -EINVAL;
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else if (cmd == VFIO_DEVICE_GET_IRQ_INFO)
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return -EINVAL;
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else if (cmd == VFIO_DEVICE_SET_IRQS)
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return -EINVAL;
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else if (cmd == VFIO_DEVICE_RESET)
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return -EINVAL;
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return -ENOTTY;
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}
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static ssize_t vfio_platform_read(void *device_data, char __user *buf,
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size_t count, loff_t *ppos)
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{
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return -EINVAL;
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}
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static ssize_t vfio_platform_write(void *device_data, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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return -EINVAL;
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}
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static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma)
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{
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return -EINVAL;
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}
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static const struct vfio_device_ops vfio_platform_ops = {
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.name = "vfio-platform",
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.open = vfio_platform_open,
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.release = vfio_platform_release,
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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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};
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int vfio_platform_probe_common(struct vfio_platform_device *vdev,
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struct device *dev)
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{
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struct iommu_group *group;
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int ret;
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if (!vdev)
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return -EINVAL;
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group = iommu_group_get(dev);
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if (!group) {
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pr_err("VFIO: No IOMMU group for device %s\n", vdev->name);
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return -EINVAL;
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}
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ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev);
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if (ret) {
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iommu_group_put(group);
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(vfio_platform_probe_common);
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struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
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{
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struct vfio_platform_device *vdev;
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vdev = vfio_del_group_dev(dev);
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if (vdev)
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iommu_group_put(dev->iommu_group);
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return vdev;
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}
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EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
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