vfio/platform: Provide a get_region_info op

Move it out of vfio_platform_ioctl() and re-indent it. Add it to all
platform drivers.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Reviewed-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/9-v2-2a9e24d62f1b+e10a-vfio_get_region_info_op_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex@shazbot.org>

4 files changed, 32 insertions, 22 deletions

diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
index 9f5c527baa8a..d600deaf23b6 100644
--- a/drivers/vfio/platform/vfio_amba.c
+++ b/drivers/vfio/platform/vfio_amba.c
@@ -115,6 +115,7 @@ static const struct vfio_device_ops vfio_amba_ops = {
 	.open_device	= vfio_platform_open_device,
 	.close_device	= vfio_platform_close_device,
 	.ioctl		= vfio_platform_ioctl,
+	.get_region_info = vfio_platform_ioctl_get_region_info,
 	.read		= vfio_platform_read,
 	.write		= vfio_platform_write,
 	.mmap		= vfio_platform_mmap,
diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
index 512533501eb7..0e85c914b651 100644
--- a/drivers/vfio/platform/vfio_platform.c
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -101,6 +101,7 @@ static const struct vfio_device_ops vfio_platform_ops = {
 	.open_device	= vfio_platform_open_device,
 	.close_device	= vfio_platform_close_device,
 	.ioctl		= vfio_platform_ioctl,
+	.get_region_info = vfio_platform_ioctl_get_region_info,
 	.read		= vfio_platform_read,
 	.write		= vfio_platform_write,
 	.mmap		= vfio_platform_mmap,
diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index 3bf1043cd795..3ebd50fb78fb 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -272,6 +272,34 @@ err_irq:
 }
 EXPORT_SYMBOL_GPL(vfio_platform_open_device);
 
+int vfio_platform_ioctl_get_region_info(struct vfio_device *core_vdev,
+					struct vfio_region_info __user *arg)
+{
+	struct vfio_platform_device *vdev =
+		container_of(core_vdev, struct vfio_platform_device, vdev);
+	struct vfio_region_info info;
+	unsigned long minsz;
+
+	minsz = offsetofend(struct vfio_region_info, offset);
+
+	if (copy_from_user(&info, arg, minsz))
+		return -EFAULT;
+
+	if (info.argsz < minsz)
+		return -EINVAL;
+
+	if (info.index >= vdev->num_regions)
+		return -EINVAL;
+
+	/* map offset to the physical address  */
+	info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index);
+	info.size = vdev->regions[info.index].size;
+	info.flags = vdev->regions[info.index].flags;
+
+	return copy_to_user(arg, &info, minsz) ? -EFAULT : 0;
+}
+EXPORT_SYMBOL_GPL(vfio_platform_ioctl_get_region_info);
+
 long vfio_platform_ioctl(struct vfio_device *core_vdev,
 			 unsigned int cmd, unsigned long arg)
 {
@@ -300,28 +328,6 @@ long vfio_platform_ioctl(struct vfio_device *core_vdev,
 		return copy_to_user((void __user *)arg, &info, minsz) ?
 			-EFAULT : 0;
 
-	} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
-		struct vfio_region_info info;
-
-		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 (info.index >= vdev->num_regions)
-			return -EINVAL;
-
-		/* map offset to the physical address  */
-		info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index);
-		info.size = vdev->regions[info.index].size;
-		info.flags = vdev->regions[info.index].flags;
-
-		return copy_to_user((void __user *)arg, &info, minsz) ?
-			-EFAULT : 0;
-
 	} else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
 		struct vfio_irq_info info;
 
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
index 8d8fab516849..a6008320e77b 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -85,6 +85,8 @@ int vfio_platform_open_device(struct vfio_device *core_vdev);
 void vfio_platform_close_device(struct vfio_device *core_vdev);
 long vfio_platform_ioctl(struct vfio_device *core_vdev,
 			 unsigned int cmd, unsigned long arg);
+int vfio_platform_ioctl_get_region_info(struct vfio_device *core_vdev,
+					struct vfio_region_info __user *arg);
 ssize_t vfio_platform_read(struct vfio_device *core_vdev,
 			   char __user *buf, size_t count,
 			   loff_t *ppos);