From 5fa25ee0bde3ad47e99e9877313a36a9ace95b72 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>
Date: Wed, 7 Aug 2013 13:02:53 +0200
Subject: uio: provide vm access to UIO_MEM_PHYS maps
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commit 7294151d0592e0ff48c61fca9fd7c93d613134da upstream.
This makes it possible to let gdb access mappings of the process that is
being debugged.
uio_mmap_logical was moved and uio_vm_ops renamed to group related code
and differentiate to new stuff.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/uio/uio.c | 26 +++++++++++++++++---------
1 file changed, 17 insertions(+), 9 deletions(-)
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index b645c47501b4..bcdcb4c2132c 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -630,12 +630,26 @@ static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
return 0;
}
-static const struct vm_operations_struct uio_vm_ops = {
+static const struct vm_operations_struct uio_logical_vm_ops = {
.open = uio_vma_open,
.close = uio_vma_close,
.fault = uio_vma_fault,
};
+static int uio_mmap_logical(struct vm_area_struct *vma)
+{
+ vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
+ vma->vm_ops = &uio_logical_vm_ops;
+ uio_vma_open(vma);
+ return 0;
+}
+
+static const struct vm_operations_struct uio_physical_vm_ops = {
+#ifdef CONFIG_HAVE_IOREMAP_PROT
+ .access = generic_access_phys,
+#endif
+};
+
static int uio_mmap_physical(struct vm_area_struct *vma)
{
struct uio_device *idev = vma->vm_private_data;
@@ -643,6 +657,8 @@ static int uio_mmap_physical(struct vm_area_struct *vma)
if (mi < 0)
return -EINVAL;
+ vma->vm_ops = &uio_physical_vm_ops;
+
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
return remap_pfn_range(vma,
@@ -652,14 +668,6 @@ static int uio_mmap_physical(struct vm_area_struct *vma)
vma->vm_page_prot);
}
-static int uio_mmap_logical(struct vm_area_struct *vma)
-{
- vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
- vma->vm_ops = &uio_vm_ops;
- uio_vma_open(vma);
- return 0;
-}
-
static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
{
struct uio_listener *listener = filep->private_data;
--
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