[PATCH v8 02/18] vfio: platform: probe to devices on the platform bus

[PATCH v8 02/18] vfio: platform: probe to devices on the platform bus

[Antonios Motakis]

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-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
---
 drivers/vfio/platform/vfio_platform.c | 107 ++++++++++++++++++++++++++++++++++
 include/uapi/linux/vfio.h             |   1 +
 2 files changed, 108 insertions(+)
 create mode 100644 drivers/vfio/platform/vfio_platform.c

diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
new file mode 100644
index 0000000..baeb7da
--- /dev/null
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
+ *
+ * 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/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>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+
+#include "vfio_platform_private.h"
+
+#define DRIVER_VERSION  "0.8"
+#define DRIVER_AUTHOR   "Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>"
+#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)) {
+			num--;
+
+			if (!num)
+				return r;
+		}
+	}
+	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)
+{
+	return vfio_platform_remove_common(&pdev->dev);
+}
+
+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 111b5e8..aca6d3e 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -158,6 +158,7 @@ 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 */
 };
-- 
2.1.1

Re: [PATCH v8 02/18] vfio: platform: probe to devices on the platform bus

[Alex Williamson]

On Mon, 2014-10-13 at 15:10 +0200, Antonios Motakis wrote:
> 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-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
> ---
>  drivers/vfio/platform/vfio_platform.c | 107 ++++++++++++++++++++++++++++++++++
>  include/uapi/linux/vfio.h             |   1 +
>  2 files changed, 108 insertions(+)
>  create mode 100644 drivers/vfio/platform/vfio_platform.c
> 
> diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
> new file mode 100644
> index 0000000..baeb7da
> --- /dev/null
> +++ b/drivers/vfio/platform/vfio_platform.c
> @@ -0,0 +1,107 @@
> +/*
> + * Copyright (C) 2013 - Virtual Open Systems
> + * Author: Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
> + *
> + * 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/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>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +#include <linux/irq.h>
> +
> +#include "vfio_platform_private.h"
> +
> +#define DRIVER_VERSION  "0.8"
> +#define DRIVER_AUTHOR   "Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>"
> +#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)) {
> +			num--;
> +
> +			if (!num)
> +				return r;

Has this been tested?  What happens when we call this with num = 0?

> +		}
> +	}
> +	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)
> +{
> +	return vfio_platform_remove_common(&pdev->dev);
> +}
> +
> +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 111b5e8..aca6d3e 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -158,6 +158,7 @@ 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 */
>  };

Re: [PATCH v8 02/18] vfio: platform: probe to devices on the platform bus

[Eric Auger]

On 10/21/2014 06:17 PM, Alex Williamson wrote:
> On Mon, 2014-10-13 at 15:10 +0200, Antonios Motakis wrote:
>> 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-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
>> ---
>>  drivers/vfio/platform/vfio_platform.c | 107 ++++++++++++++++++++++++++++++++++
>>  include/uapi/linux/vfio.h             |   1 +
>>  2 files changed, 108 insertions(+)
>>  create mode 100644 drivers/vfio/platform/vfio_platform.c
>>
>> diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
>> new file mode 100644
>> index 0000000..baeb7da
>> --- /dev/null
>> +++ b/drivers/vfio/platform/vfio_platform.c
>> @@ -0,0 +1,107 @@
>> +/*
>> + * Copyright (C) 2013 - Virtual Open Systems
>> + * Author: Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
>> + *
>> + * 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/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>
>> +#include <linux/io.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/irq.h>
>> +
>> +#include "vfio_platform_private.h"
>> +
>> +#define DRIVER_VERSION  "0.8"
>> +#define DRIVER_AUTHOR   "Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>"
>> +#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)) {
>> +			num--;
>> +
>> +			if (!num)
>> +				return r;
> 
> Has this been tested?  What happens when we call this with num = 0?
Yep. I confirm I enter that case with my xgmac where the IORESOURCE_MEM
is the 1st resource. I Just ended to the same cause ;-)

Best Regards

Eric
> 
>> +		}
>> +	}
>> +	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)
>> +{
>> +	return vfio_platform_remove_common(&pdev->dev);
>> +}
>> +
>> +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 111b5e8..aca6d3e 100644
>> --- a/include/uapi/linux/vfio.h
>> +++ b/include/uapi/linux/vfio.h
>> @@ -158,6 +158,7 @@ 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 */
>>  };
> 
> 
> 

Re: [PATCH v8 02/18] vfio: platform: probe to devices on the platform bus

[Antonios Motakis]

On Tue, Oct 21, 2014 at 6:37 PM, Eric Auger <eric.auger-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> wrote:
> On 10/21/2014 06:17 PM, Alex Williamson wrote:
>> On Mon, 2014-10-13 at 15:10 +0200, Antonios Motakis wrote:
>>> 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-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
>>> ---
>>>  drivers/vfio/platform/vfio_platform.c | 107 ++++++++++++++++++++++++++++++++++
>>>  include/uapi/linux/vfio.h             |   1 +
>>>  2 files changed, 108 insertions(+)
>>>  create mode 100644 drivers/vfio/platform/vfio_platform.c
>>>
>>> diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
>>> new file mode 100644
>>> index 0000000..baeb7da
>>> --- /dev/null
>>> +++ b/drivers/vfio/platform/vfio_platform.c
>>> @@ -0,0 +1,107 @@
>>> +/*
>>> + * Copyright (C) 2013 - Virtual Open Systems
>>> + * Author: Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
>>> + *
>>> + * 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/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>
>>> +#include <linux/io.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/irq.h>
>>> +
>>> +#include "vfio_platform_private.h"
>>> +
>>> +#define DRIVER_VERSION  "0.8"
>>> +#define DRIVER_AUTHOR   "Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>"
>>> +#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)) {
>>> +                    num--;
>>> +
>>> +                    if (!num)
>>> +                            return r;
>>
>> Has this been tested?  What happens when we call this with num = 0?
> Yep. I confirm I enter that case with my xgmac where the IORESOURCE_MEM
> is the 1st resource. I Just ended to the same cause ;-)

Right, num-- should be after the check, or we miss one region.

>
> Best Regards
>
> Eric
>>
>>> +            }
>>> +    }
>>> +    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)
>>> +{
>>> +    return vfio_platform_remove_common(&pdev->dev);
>>> +}
>>> +
>>> +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 111b5e8..aca6d3e 100644
>>> --- a/include/uapi/linux/vfio.h
>>> +++ b/include/uapi/linux/vfio.h
>>> @@ -158,6 +158,7 @@ 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 */
>>>  };
>>
>>
>>
>



-- 
Antonios Motakis
Virtual Open Systems

[PATCH v8 04/18] vfio: amba: VFIO support for AMBA devices

[Antonios Motakis]

Add support for discovering AMBA devices with VFIO and handle them
similarly to Linux platform devices.

Signed-off-by: Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
---
 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..b16a40d
--- /dev/null
+++ b/drivers/vfio/platform/vfio_amba.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
+ *
+ * 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  "0.8"
+#define DRIVER_AUTHOR   "Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>"
+#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 aca6d3e..1a5986c 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 */
 };
-- 
2.1.1