From dabedc318e21306c280b8ec11173cbbdbb4d98df Mon Sep 17 00:00:00 2001 From: Antonios Motakis Date: Mon, 16 Mar 2015 14:08:46 -0600 Subject: [PATCH] vfio/platform: return info for bound device 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 enables the VFIO_DEVICE_GET_INFO ioctl call. Signed-off-by: Antonios Motakis [Baptiste Reynal: added include in vfio_platform_common.c] Signed-off-by: Baptiste Reynal Reviewed-by: Eric Auger Tested-by: Eric Auger Signed-off-by: Alex Williamson --- drivers/vfio/platform/vfio_platform_common.c | 24 +++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c index 34d023bdda163..c2f853a3b3dd3 100644 --- a/drivers/vfio/platform/vfio_platform_common.c +++ b/drivers/vfio/platform/vfio_platform_common.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include "vfio_platform_private.h" @@ -38,10 +39,27 @@ static int vfio_platform_open(void *device_data) static long vfio_platform_ioctl(void *device_data, unsigned int cmd, unsigned long arg) { - if (cmd == VFIO_DEVICE_GET_INFO) - return -EINVAL; + struct vfio_platform_device *vdev = device_data; + unsigned long minsz; + + if (cmd == VFIO_DEVICE_GET_INFO) { + struct vfio_device_info info; + + minsz = offsetofend(struct vfio_device_info, num_irqs); + + if (copy_from_user(&info, (void __user *)arg, minsz)) + return -EFAULT; + + if (info.argsz < minsz) + return -EINVAL; + + info.flags = vdev->flags; + info.num_regions = 0; + info.num_irqs = 0; + + return copy_to_user((void __user *)arg, &info, minsz); - else if (cmd == VFIO_DEVICE_GET_REGION_INFO) + } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) return -EINVAL; else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) -- 2.39.5