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authorStephen Hemminger <stephen@networkplumber.org>2018-09-14 09:10:18 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-25 20:33:24 +0200
commitbfddabfa230452cea32aae82f9cd85ab22601acf (patch)
tree704cf589d9d5d29ffd837ec15217bba17a785ee2
parentae6935ed7d424ffa74d634da00767e7b03c98fd3 (diff)
downloadlinux-bfddabfa230452cea32aae82f9cd85ab22601acf.tar.bz2
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>
-rw-r--r--drivers/uio/uio.c24
-rw-r--r--include/linux/uio_driver.h1
2 files changed, 14 insertions, 11 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 0ffb324aa038..e601bd3fbae1 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -738,7 +738,8 @@ static int uio_mmap_physical(struct vm_area_struct *vma)
return -EINVAL;
vma->vm_ops = &uio_physical_vm_ops;
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ if (idev->info->mem[mi].memtype == UIO_MEM_PHYS)
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
/*
* We cannot use the vm_iomap_memory() helper here,
@@ -795,18 +796,19 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
}
switch (idev->info->mem[mi].memtype) {
- case UIO_MEM_PHYS:
- ret = uio_mmap_physical(vma);
- break;
- case UIO_MEM_LOGICAL:
- case UIO_MEM_VIRTUAL:
- ret = uio_mmap_logical(vma);
- break;
- default:
- ret = -EINVAL;
+ case UIO_MEM_IOVA:
+ case UIO_MEM_PHYS:
+ ret = uio_mmap_physical(vma);
+ break;
+ case UIO_MEM_LOGICAL:
+ case UIO_MEM_VIRTUAL:
+ ret = uio_mmap_logical(vma);
+ break;
+ default:
+ ret = -EINVAL;
}
-out:
+ out:
mutex_unlock(&idev->info_lock);
return ret;
}
diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h
index 6f8b68cd460f..a3cd7cb67a69 100644
--- a/include/linux/uio_driver.h
+++ b/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