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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2013-08-07 13:02:53 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-13 00:46:51 +0200 |
| commit | 7294151d0592e0ff48c61fca9fd7c93d613134da (patch) | |
| tree | 0f47ae996e2811f92f7c430d93cbae6acf8ccd47 | |
| parent | mm: make generic_access_phys available for modules (diff) | |
| download | linux-7294151d0592e0ff48c61fca9fd7c93d613134da.tar.xz linux-7294151d0592e0ff48c61fca9fd7c93d613134da.zip | |
uio: provide vm access to UIO_MEM_PHYS maps
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>
| -rw-r--r-- | drivers/uio/uio.c | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 3b96f18593b3..c4279b2234ac 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; |