linux-kernel - [PATCHv7 14/26] vfio/platform: return info for bound device

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Date:	Tue, 23 Sep 2014 16:46:13 +0200
From:	Antonios Motakis <a.motakis@...tualopensystems.com>
To:	alex.williamson@...hat.com, kvmarm@...ts.cs.columbia.edu,
	iommu@...ts.linux-foundation.org
Cc:	tech@...tualopensystems.com, kvm@...r.kernel.org,
	christoffer.dall@...aro.org, will.deacon@....com,
	kim.phillips@...escale.com, eric.auger@...aro.org,
	marc.zyngier@....com,
	Antonios Motakis <a.motakis@...tualopensystems.com>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCHv7 14/26] 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 <a.motakis@...tualopensystems.com>
---
 drivers/vfio/platform/vfio_platform_common.c | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index 07d02dc..ba5edfd 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -43,10 +43,27 @@ 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)
-- 
1.8.3.2

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