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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