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/* 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>
#include <xen/interface/event_channel.h>
#include <xen/grant_table.h>
struct gntdev_dmabuf_priv;
struct gntdev_priv {
/* Maps with visible offsets in the file descriptor. */
struct list_head maps;
/* lock protects maps and freeable_maps. */
struct mutex lock;
#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;
evtchn_port_t event;
};
struct gntdev_grant_map {
atomic_t in_use;
struct mmu_interval_notifier notifier;
bool notifier_init;
struct list_head next;
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;
bool *being_removed;
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
/* Number of live grants */
atomic_t live_grants;
/* Needed to avoid allocation in __unmap_grant_pages */
struct gntab_unmap_queue_data unmap_data;
};
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_test_page_count(unsigned int count);
int gntdev_map_grant_pages(struct gntdev_grant_map *map);
#endif
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