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authorAntonios Motakis <a.motakis@virtualopensystems.com>2015-03-16 14:08:46 -0600
committerAlex Williamson <alex.williamson@redhat.com>2015-03-16 14:08:46 -0600
commit2e8567bbb536cfc7336f8f105ef43adc98b9c156 (patch)
tree4e722fdc5fa85b2e022b9bfcf1bb9f9aa9529200
parentb13329adc2cd6c613ffd95b681a0d4cbd399939f (diff)
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@virtualopensystems.com> [Baptiste Reynal: added include in vfio_platform_common.c] 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>
-rw-r--r--drivers/vfio/platform/vfio_platform_common.c24
1 files changed, 21 insertions, 3 deletions
diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index 34d023bdda16..c2f853a3b3dd 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -18,6 +18,7 @@
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/types.h>
+#include <linux/uaccess.h>
#include <linux/vfio.h>
#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)