mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
932d656217
Add UAPI and IOCTLs for dma-buf grant device driver extension: the extension allows userspace processes and kernel modules to use Xen backed dma-buf implementation. With this extension grant references to the pages of an imported dma-buf can be exported for other domain use and grant references coming from a foreign domain can be converted into a local dma-buf for local export. Implement basic initialization and stubs for Xen DMA buffers' support. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
/*
|
|
* Common functionality of grant device.
|
|
*
|
|
* Copyright (c) 2006-2007, D G Murray.
|
|
* (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
|
|
* (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_dmabuf_priv;
|
|
|
|
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
|
|
*/
|
|
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
|
|
|
|
#ifdef CONFIG_XEN_GNTDEV_DMABUF
|
|
struct gntdev_dmabuf_priv *dmabuf_priv;
|
|
#endif
|
|
};
|
|
|
|
struct gntdev_unmap_notify {
|
|
int flags;
|
|
/* Address relative to the start of the gntdev_grant_map. */
|
|
int addr;
|
|
int event;
|
|
};
|
|
|
|
struct gntdev_grant_map {
|
|
struct list_head next;
|
|
struct vm_area_struct *vma;
|
|
int index;
|
|
int count;
|
|
int flags;
|
|
refcount_t users;
|
|
struct gntdev_unmap_notify notify;
|
|
struct ioctl_gntdev_grant_ref *grants;
|
|
struct gnttab_map_grant_ref *map_ops;
|
|
struct gnttab_unmap_grant_ref *unmap_ops;
|
|
struct gnttab_map_grant_ref *kmap_ops;
|
|
struct gnttab_unmap_grant_ref *kunmap_ops;
|
|
struct page **pages;
|
|
unsigned long pages_vm_start;
|
|
|
|
#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
|
|
/*
|
|
* If dmabuf_vaddr is not NULL then this mapping is backed by DMA
|
|
* capable memory.
|
|
*/
|
|
|
|
struct device *dma_dev;
|
|
/* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
|
|
int dma_flags;
|
|
void *dma_vaddr;
|
|
dma_addr_t dma_bus_addr;
|
|
/* Needed to avoid allocation in gnttab_dma_free_pages(). */
|
|
xen_pfn_t *frames;
|
|
#endif
|
|
};
|
|
|
|
struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
|
|
int dma_flags);
|
|
|
|
void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add);
|
|
|
|
void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
|
|
|
|
bool gntdev_account_mapped_pages(int count);
|
|
|
|
int gntdev_map_grant_pages(struct gntdev_grant_map *map);
|
|
|
|
#endif
|