diff options
| -rw-r--r-- | drivers/vfio/platform/vfio_platform.c | 103 | ||||
| -rw-r--r-- | include/uapi/linux/vfio.h | 1 |
2 files changed, 104 insertions, 0 deletions
diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c new file mode 100644 index 000000000000..cef645c83996 --- /dev/null +++ b/drivers/vfio/platform/vfio_platform.c @@ -0,0 +1,103 @@ +/* + * Copyright (C) 2013 - Virtual Open Systems + * Author: Antonios Motakis <a.motakis@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/module.h> +#include <linux/slab.h> +#include <linux/vfio.h> +#include <linux/platform_device.h> + +#include "vfio_platform_private.h" + +#define DRIVER_VERSION "0.10" +#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>" +#define DRIVER_DESC "VFIO for platform devices - User Level meta-driver" + +/* probing devices from the linux platform bus */ + +static struct resource *get_platform_resource(struct vfio_platform_device *vdev, + int num) +{ + struct platform_device *dev = (struct platform_device *) vdev->opaque; + int i; + + for (i = 0; i < dev->num_resources; i++) { + struct resource *r = &dev->resource[i]; + + if (resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) { + if (!num) + return r; + + num--; + } + } + return NULL; +} + +static int get_platform_irq(struct vfio_platform_device *vdev, int i) +{ + struct platform_device *pdev = (struct platform_device *) vdev->opaque; + + return platform_get_irq(pdev, i); +} + +static int vfio_platform_probe(struct platform_device *pdev) +{ + struct vfio_platform_device *vdev; + int ret; + + vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); + if (!vdev) + return -ENOMEM; + + vdev->opaque = (void *) pdev; + vdev->name = pdev->name; + vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM; + vdev->get_resource = get_platform_resource; + vdev->get_irq = get_platform_irq; + + ret = vfio_platform_probe_common(vdev, &pdev->dev); + if (ret) + kfree(vdev); + + return ret; +} + +static int vfio_platform_remove(struct platform_device *pdev) +{ + struct vfio_platform_device *vdev; + + vdev = vfio_platform_remove_common(&pdev->dev); + if (vdev) { + kfree(vdev); + return 0; + } + + return -EINVAL; +} + +static struct platform_driver vfio_platform_driver = { + .probe = vfio_platform_probe, + .remove = vfio_platform_remove, + .driver = { + .name = "vfio-platform", + .owner = THIS_MODULE, + }, +}; + +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 82889c30f4f5..ea9514b6bb5c 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -160,6 +160,7 @@ 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 */ }; |