Add support for discovering AMBA devices with VFIO and handle them similarly to Linux platform devices.
Signed-off-by: Antonios Motakis <a.mota...@virtualopensystems.com> --- drivers/vfio/platform/vfio_amba.c | 108 ++++++++++++++++++++++++++++++++++++++ include/uapi/linux/vfio.h | 1 + 2 files changed, 109 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..e8c5e1a --- /dev/null +++ b/drivers/vfio/platform/vfio_amba.c @@ -0,0 +1,108 @@ +/* + * 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. + */ + +#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 "0.7" +#define DRIVER_AUTHOR "Antonios Motakis <a.mota...@virtualopensystems.com>" +#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; + + 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]; + + return 0; +} + +static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id) +{ + + struct vfio_platform_device *vdev; + int ret; + + vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); + if (!vdev) + return -ENOMEM; + + vdev->opaque = (void *) adev; + vdev->name = "vfio-amba-dev"; + vdev->flags = VFIO_DEVICE_FLAGS_AMBA; + vdev->get_resource = get_amba_resource; + vdev->get_irq = get_amba_irq; + + ret = vfio_platform_probe_common(vdev, &adev->dev); + if (ret) + kfree(vdev); + + return ret; +} + +static int vfio_amba_remove(struct amba_device *adev) +{ + return vfio_platform_remove_common(&adev->dev); +} + +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); diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index b022a25..72f121f 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -159,6 +159,7 @@ struct vfio_device_info { #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 */ +#define VFIO_DEVICE_FLAGS_AMBA (1 << 3) /* vfio-amba device */ __u32 num_regions; /* Max region index + 1 */ __u32 num_irqs; /* Max IRQ index + 1 */ }; -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html