On Mon, 2013-09-30 at 17:28 +0200, Antonios Motakis wrote:
> A VFIO userspace driver will start by opening the VFIO device
> that corresponds to an IOMMU group, and will use the ioctl interface
> to get the basic device info, such as number of memory regions and
> interrupts, and their properties.
>
> This patch implements the IOCTLs:
> - VFIO_DEVICE_GET_INFO
> - VFIO_DEVICE_GET_REGION_INFO
> - VFIO_DEVICE_GET_IRQ_INFO
>
> Signed-off-by: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/vfio/vfio_platform.c | 60 ++++++++++++++++++++++++++++++++++++++------
> 1 file changed, 53 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/vfio/vfio_platform.c b/drivers/vfio/vfio_platform.c
> index b9686b0..a0abcfa 100644
> --- a/drivers/vfio/vfio_platform.c
> +++ b/drivers/vfio/vfio_platform.c
> @@ -28,6 +28,10 @@
> #include <linux/types.h>
> #include <linux/uaccess.h>
> #include <linux/vfio.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
>
> #define DRIVER_VERSION "0.1"
> #define DRIVER_AUTHOR "Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>"
> @@ -54,10 +58,13 @@ static long vfio_platform_ioctl(void *device_data,
> unsigned int cmd, unsigned long arg)
> {
> struct vfio_platform_device *vdev = device_data;
> + struct device_node *of_node = vdev->pdev->dev.of_node;
> unsigned long minsz;
>
> if (cmd == VFIO_DEVICE_GET_INFO) {
> struct vfio_device_info info;
> + struct resource res;
> + int cnt = 0;
>
> minsz = offsetofend(struct vfio_device_info, num_irqs);
>
> @@ -68,18 +75,57 @@ static long vfio_platform_ioctl(void *device_data,
> return -EINVAL;
>
> info.flags = VFIO_DEVICE_FLAGS_PLATFORM;
> - info.num_regions = 0;
> - info.num_irqs = 0;
> +
> + while (!of_address_to_resource(of_node, cnt, &res))
> + cnt++;
> +
> + info.num_regions = cnt;
> +
> + info.num_irqs = of_irq_count(of_node);
>
> return copy_to_user((void __user *)arg, &info, minsz);
>
> - } else if (cmd == VFIO_DEVICE_GET_REGION_INFO)
> - return -EINVAL;
> + } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
> + struct vfio_region_info info;
> + struct resource res;
>
> - else if (cmd == VFIO_DEVICE_GET_IRQ_INFO)
> - return -EINVAL;
> + minsz = offsetofend(struct vfio_region_info, offset);
> +
> + if (copy_from_user(&info, (void __user *)arg, minsz))
> + return -EFAULT;
> +
> + if (info.argsz < minsz)
> + return -EINVAL;
> +
> + if(of_address_to_resource(of_node, info.index, &res))
> + return -EINVAL;
> +
> + info.offset = res.start; /* map phys addr with offset */
> + info.size = resource_size(&res);
> + info.flags = 0;
> +
> + return copy_to_user((void __user *)arg, &info, minsz);
> +
> + } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
> + struct vfio_irq_info info;
> + struct resource res;
> +
> + minsz = offsetofend(struct vfio_irq_info, count);
> +
> + if (copy_from_user(&info, (void __user *)arg, minsz))
> + return -EFAULT;
> +
> + if (info.argsz < minsz)
> + return -EINVAL;
> +
> + of_irq_to_resource(of_node, info.index, &res);
> +
> + info.flags = 0;
> + info.count = 1;
> +
> + return copy_to_user((void __user *)arg, &info, minsz);
>
> - else if (cmd == VFIO_DEVICE_SET_IRQS)
> + } else if (cmd == VFIO_DEVICE_SET_IRQS)
> return -EINVAL;
>
> else if (cmd == VFIO_DEVICE_RESET)
I notice all the open firmware calls here and I'm curious, will all
platform devices be making use of open firmware? I don't know if this
is synonymous with device tree or not. Thanks,
Alex
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