[mirror_ubuntu-hirsute-kernel.git] / drivers / xen / gntdev-common.h

/* 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;
	/* 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;
	int event;
};

struct gntdev_grant_map {
	struct mmu_interval_notifier notifier;
	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
Commit	Line	Data
1d314567 OA	1	/* SPDX-License-Identifier: GPL-2.0 */
	2
	3	/*
	4	* Common functionality of grant device.
	5	*
	6	* Copyright (c) 2006-2007, D G Murray.
	7	* (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
	8	* (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
	9	*/
	10
	11	#ifndef _GNTDEV_COMMON_H
	12	#define _GNTDEV_COMMON_H
	13
	14	#include <linux/mm.h>
	15	#include <linux/mman.h>
	16	#include <linux/mmu_notifier.h>
	17	#include <linux/types.h>
	18
932d6562 OA	19	struct gntdev_dmabuf_priv;
932d6562 OA	20
1d314567 OA	21	struct gntdev_priv {
	22	/* Maps with visible offsets in the file descriptor. */
	23	struct list_head maps;
1d314567 OA	24	/* lock protects maps and freeable_maps. */
1d314567 OA	25	struct mutex lock;
1d314567 OA	26
	27	#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
	28	/* Device for which DMA memory is allocated. */
	29	struct device *dma_dev;
	30	#endif
932d6562 OA	31
	32	#ifdef CONFIG_XEN_GNTDEV_DMABUF
	33	struct gntdev_dmabuf_priv *dmabuf_priv;
	34	#endif
1d314567 OA	35	};
	36
	37	struct gntdev_unmap_notify {
	38	int flags;
	39	/* Address relative to the start of the gntdev_grant_map. */
	40	int addr;
	41	int event;
	42	};
	43
	44	struct gntdev_grant_map {
d3eeb1d7	45	struct mmu_interval_notifier notifier;
1d314567 OA	46	struct list_head next;
	47	struct vm_area_struct *vma;
	48	int index;
	49	int count;
	50	int flags;
	51	refcount_t users;
	52	struct gntdev_unmap_notify notify;
	53	struct ioctl_gntdev_grant_ref *grants;
	54	struct gnttab_map_grant_ref *map_ops;
	55	struct gnttab_unmap_grant_ref *unmap_ops;
	56	struct gnttab_map_grant_ref *kmap_ops;
	57	struct gnttab_unmap_grant_ref *kunmap_ops;
	58	struct page **pages;
	59	unsigned long pages_vm_start;
	60
	61	#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
	62	/*
	63	* If dmabuf_vaddr is not NULL then this mapping is backed by DMA
	64	* capable memory.
	65	*/
	66
	67	struct device *dma_dev;
	68	/* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
	69	int dma_flags;
	70	void *dma_vaddr;
	71	dma_addr_t dma_bus_addr;
	72	/* Needed to avoid allocation in gnttab_dma_free_pages(). */
	73	xen_pfn_t *frames;
	74	#endif
	75	};
	76
	77	struct gntdev_grant_map gntdev_alloc_map(struct gntdev_priv priv, int count,
	78	int dma_flags);
	79
	80	void gntdev_add_map(struct gntdev_priv priv, struct gntdev_grant_map add);
	81
	82	void gntdev_put_map(struct gntdev_priv priv, struct gntdev_grant_map map);
	83
	84	bool gntdev_account_mapped_pages(int count);
	85
	86	int gntdev_map_grant_pages(struct gntdev_grant_map *map);
	87
	88	#endif