file mode 100644 index 0000000..b9686b0
--- /dev/null
+++ b/drivers/vfio/vfio_platform.c
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis<a.mota...@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include<linux/device.h>
+#include<linux/eventfd.h>
+#include<linux/interrupt.h>
+#include<linux/iommu.h>
+#include<linux/module.h>
+#include<linux/mutex.h>
+#include<linux/notifier.h>
+#include<linux/pm_runtime.h>
+#include<linux/slab.h>
+#include<linux/types.h>
+#include<linux/uaccess.h>
+#include<linux/vfio.h>
+
+#define DRIVER_VERSION "0.1"
+#define DRIVER_AUTHOR "Antonios Motakis<a.mota...@virtualopensystems.com>"
+#define DRIVER_DESC "VFIO Device Tree devices - User Level meta-driver"
+
+struct vfio_platform_device {
+ struct platform_device *pdev;
+};
+
+static void vfio_platform_release(void *device_data) {
+ module_put(THIS_MODULE);
+}
+
+static int vfio_platform_open(void *device_data) {
+ if (!try_module_get(THIS_MODULE))
+ return -ENODEV;
+
+ return 0;
+}
+
+static long vfio_platform_ioctl(void *device_data,
+ unsigned int cmd, unsigned long arg) {
+ struct vfio_platform_device *vdev = device_data;
+ unsigned long minsz;
+
+ if (cmd == VFIO_DEVICE_GET_INFO) {
+ struct vfio_device_info info;
+
+ minsz = offsetofend(struct vfio_device_info, num_irqs);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz< minsz)
+ return -EINVAL;
+
+ info.flags = VFIO_DEVICE_FLAGS_PLATFORM;
+ info.num_regions = 0;
+ info.num_irqs = 0;
+
+ return copy_to_user((void __user *)arg,&info, minsz);
+
+ } else if (cmd == VFIO_DEVICE_GET_REGION_INFO)
+ return -EINVAL;
+
+ else if (cmd == VFIO_DEVICE_GET_IRQ_INFO)
+ return -EINVAL;
+
+ else if (cmd == VFIO_DEVICE_SET_IRQS)
+ return -EINVAL;
+
+ else if (cmd == VFIO_DEVICE_RESET)
+ return -EINVAL;
+
+ return -ENOTTY;
+}
+
+static ssize_t vfio_platform_read(void *device_data, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ return 0;
+}
+
+static ssize_t vfio_platform_write(void *device_data, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ return 0;
+}
+
+static int vfio_platform_mmap(void *device_data, struct vm_area_struct
+*vma) {
+ return -EINVAL;
+}
+
+static const struct vfio_device_ops vfio_platform_ops = {
+ .name = "vfio-platform",
+ .open = vfio_platform_open,
+ .release = vfio_platform_release,
+ .ioctl = vfio_platform_ioctl,
+ .read = vfio_platform_read,
+ .write = vfio_platform_write,
+ .mmap = vfio_platform_mmap,
+};
+
+static int vfio_platform_probe(struct platform_device *pdev) {
+ struct vfio_platform_device *vdev;
+ struct iommu_group *group;
+ int ret;
+
+ group = iommu_group_get(&pdev->dev);
+ if (!group) {
+ pr_err("VFIO: No IOMMU group for device %s\n", pdev->name);
+ return -EINVAL;
+ }
+
+ vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+ if (!vdev) {
+ iommu_group_put(group);
+ return -ENOMEM;
+ }
+
+ vdev->pdev = pdev;
+
+ ret = vfio_add_group_dev(&pdev->dev,&vfio_platform_ops, vdev);
+ if (ret) {
+ iommu_group_put(group);
+ kfree(vdev);
+ }
+
+ return ret;
+}
+
+static int vfio_platform_remove(struct platform_device *pdev) {
+ struct vfio_platform_device *vdev;
+
+ vdev = vfio_del_group_dev(&pdev->dev);
+ if (!vdev)
+ return -EINVAL;
+
+ iommu_group_put(pdev->dev.iommu_group);
+ kfree(vdev);
+
+ return 0;
+}
+
+static const struct of_device_id vfio_platform_match[] = {
+ /* Before this series can be applied, we shall implement a better
+ * mechanism to bind the module to any device. For now add the
+ * compatible property to the dtb of the devices we want to use. */
+ {
+ .compatible = "vfio",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, vfio_platform_match);
+
+static struct platform_driver vfio_platform_driver = {
+ .probe = vfio_platform_probe,
+ .remove = vfio_platform_remove,
+ .driver = {
+ .name = "vfio-platform",
+ .owner = THIS_MODULE,
+ .of_match_table = vfio_platform_match,
+ },
+};
+
+module_platform_driver(vfio_platform_driver);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index
284ff24..8d7434d 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -147,6 +147,7 @@ struct vfio_device_info {
__u32 flags;
#define VFIO_DEVICE_FLAGS_RESET (1<< 0) /* Device supports reset */
#define VFIO_DEVICE_FLAGS_PCI (1<< 1) /* vfio-pci device */
+#define VFIO_DEVICE_FLAGS_PLATFORM (1<< 2) /* vfio-platform device */
__u32 num_regions; /* Max region index + 1 */
__u32 num_irqs; /* Max IRQ index + 1 */
};
--
1.8.1.2
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