Re: [Xen-devel] [PATCH v3 6/9] xen/gntdev: Make private routines/structures accessible

[Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>]

On 06/13/2018 04:38 AM, Boris Ostrovsky wrote:
> On 06/12/2018 09:41 AM, Oleksandr Andrushchenko wrote:
> > From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> >
> > This is in preparation for adding support of DMA buffer
> > functionality: make map/unmap related code and structures, used
> > privately by gntdev, ready for dma-buf extension, which will re-use
> > these. Rename corresponding structures as those become non-private
> > to gntdev now.
> >
> > Signed-off-by: Oleksandr Andrushchenko 
> > <oleksandr_andrushchenko@xxxxxxxx>
> > ---
> >   drivers/xen/gntdev-common.h |  86 +++++++++++++++++++++++
> >   drivers/xen/gntdev.c        | 132 ++++++++++++------------------------
> >   2 files changed, 128 insertions(+), 90 deletions(-)
> >   create mode 100644 drivers/xen/gntdev-common.h
> >
> > diff --git a/drivers/xen/gntdev-common.h b/drivers/xen/gntdev-common.h
> > new file mode 100644
> > index 000000000000..7a9845a6bee9
> > --- /dev/null
> > +++ b/drivers/xen/gntdev-common.h
> > @@ -0,0 +1,86 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +
> > +/*
> > + * Common functionality of grant device.
> > + *
> > + * Copyright (c) 2006-2007, D G Murray.
> > + *           (c) 2009 Gerd Hoffmann <kraxel@xxxxxxxxxx>
> > + *           (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
> > + */
> > +
> > +#ifndef _GNTDEV_COMMON_H
> > +#define _GNTDEV_COMMON_H
> > +
> > +#include <linux/mm.h>
> > +#include <linux/mman.h>
> > +#include <linux/mmu_notifier.h>
> > +#include <linux/types.h>
> > +
> > +struct gntdev_priv {
> > +    /* maps with visible offsets in the file descriptor */
> > +    struct list_head maps;
> > +    /* maps that are not visible; will be freed on munmap.
> > +     * Only populated if populate_freeable_maps == 1 */
>
> Since you are touching this code please fix comment style.
I saw that while running checkpatch, but was not sure if I have to touch
those as they seemed to be not related to the change itself.
But I'll make sure all the comments are consistent.
> > +    struct list_head freeable_maps;
> > +    /* lock protects maps and freeable_maps */
> > +    struct mutex lock;
> > +    struct mm_struct *mm;
> > +    struct mmu_notifier mn;
> > +
> > +#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
> > +    /* Device for which DMA memory is allocated. */
> > +    struct device *dma_dev;
> > +#endif
> > +};
>
> With that fixed,
>
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Thank you,
Oleksandr

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