Add support for discovering AMBA devices with VFIO and handle them
similarly to Linux platform devices.
Signed-off-by: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>
---
drivers/vfio/platform/vfio_amba.c | 129 ++++++++++++++++++++++++++++++++++++++
1 file changed, 129 insertions(+)
create mode 100644 drivers/vfio/platform/vfio_amba.c
diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
new file mode 100644
index 0000000..9fc0ae6
--- /dev/null
+++ b/drivers/vfio/platform/vfio_amba.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#include <linux/device.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>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/amba/bus.h>
+
+#include "vfio_platform_private.h"
+
+#define DRIVER_VERSION "0.6"
+#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>"
+#define DRIVER_DESC "VFIO for AMBA devices - User Level meta-driver"
+
+/* probing devices from the AMBA bus */
+
+static struct resource* get_amba_resource(struct vfio_platform_device *vdev,
+ int i)
+{
+ struct amba_device *adev = (struct amba_device *) vdev->opaque;
+
+ if (i == 0)
+ return &adev->res;
+ else
+ return NULL;
+}
+
+static int get_amba_irq(struct vfio_platform_device *vdev, int i)
+{
+ struct amba_device *adev = (struct amba_device *) vdev->opaque;
+
+ if (i < AMBA_NR_IRQS)
+ return adev->irq[i];
+ else
+ return 0;
+}
+
+static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
+{
+
+ struct vfio_platform_device *vdev;
+ struct iommu_group *group;
+ int ret;
+
+ group = iommu_group_get(&adev->dev);
+ if (!group) {
+ pr_err("VFIO: No IOMMU group for amba device with id%d\n",
+ adev->periphid);
+ return -EINVAL;
+ }
+
+ vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+ if (!vdev) {
+ iommu_group_put(group);
+ return -ENOMEM;
+ }
+
+ vdev->opaque = (void *) adev;
+ vdev->get_resource = get_amba_resource;
+ vdev->get_irq = get_amba_irq;
+ vdev->name = "AMBA device";
+
+ ret = vfio_add_group_dev(&adev->dev, &vfio_platform_ops, vdev);
+ if (ret) {
+ iommu_group_put(group);
+ kfree(vdev);
+ }
+
+ return ret;
+}
+
+static int vfio_amba_remove(struct amba_device *adev)
+{
+
+ struct vfio_platform_device *vdev;
+
+ vdev = vfio_del_group_dev(&adev->dev);
+ if (!vdev)
+ return -EINVAL;
+
+ iommu_group_put(adev->dev.iommu_group);
+ kfree(vdev);
+
+ return 0;
+}
+
+static struct amba_id pl330_ids[] = {
+ { 0, 0 },
+};
+
+MODULE_DEVICE_TABLE(amba, pl330_ids);
+
+static struct amba_driver vfio_amba_driver = {
+ .probe = vfio_amba_probe,
+ .remove = vfio_amba_remove,
+ .id_table = pl330_ids,
+ .drv = {
+ .name = "vfio-amba",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_amba_driver(vfio_amba_driver);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
--
1.8.3.2
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