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uio: provide vm access to UIO_MEM_PHYS maps

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commit 7294151d05 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>
This commit is contained in:
Uwe Kleine-König
2013-08-07 13:02:53 +02:00
committed by Greg Kroah-Hartman
parent f80d1c35d8
commit 5fa25ee0bd
1 changed files with 17 additions and 9 deletions
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26
drivers/uio/uio.c
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@@ -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;