uio: introduce UIO_MEM_IOVA

Introduce the concept of mapping physical memory locations that
are normal memory. The new type UIO_MEM_IOVA are similar to
existing UIO_MEM_PHYS but the backing memory is not marked as uncached.

Also, indent related switch to the currently used style.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/uio/uio.c

@@ -738,6 +738,7 @@ static int uio_mmap_physical(struct vm_area_struct *vma)
 		return -EINVAL;
 
 	vma->vm_ops = &uio_physical_vm_ops;
+	if (idev->info->mem[mi].memtype == UIO_MEM_PHYS)
 		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 
 	/*
@@ -795,6 +796,7 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
 	}
 
 	switch (idev->info->mem[mi].memtype) {
+	case UIO_MEM_IOVA:
 	case UIO_MEM_PHYS:
 		ret = uio_mmap_physical(vma);
 		break;
@@ -806,7 +808,7 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
 		ret = -EINVAL;
 	}
 
-out:
+ out:
 	mutex_unlock(&idev->info_lock);
 	return ret;
 }

include/linux/uio_driver.h

@@ -133,6 +133,7 @@ extern void uio_event_notify(struct uio_info *info);
 #define UIO_MEM_PHYS	1
 #define UIO_MEM_LOGICAL	2
 #define UIO_MEM_VIRTUAL 3
+#define UIO_MEM_IOVA	4
 
 /* defines for uio_port->porttype */
 #define UIO_PORT_NONE	0