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vfio: platform: probe to devices on the platform bus

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Driver to bind to Linux platform devices, and callbacks to discover their
resources to be used by the main VFIO PLATFORM code.

Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
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>
This commit is contained in:
Antonios Motakis 2015-03-16 14:08:43 -06:00 • committed by Alex Williamson
commit 9df85aaa43
2 changed files with 104 additions and 0 deletions
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103
drivers/vfio/platform/vfio_platform.c Normal file
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@ -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);

1
include/uapi/linux/vfio.h
View file

@ -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 */
};