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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_H12#define _GNTDEV_COMMON_H13 14#include <linux/mm.h>15#include <linux/mman.h>16#include <linux/mmu_notifier.h>17#include <linux/types.h>18#include <xen/interface/event_channel.h>19#include <xen/grant_table.h>20 21struct gntdev_dmabuf_priv;22 23struct gntdev_priv {24 /* Maps with visible offsets in the file descriptor. */25 struct list_head maps;26 /* lock protects maps and freeable_maps. */27 struct mutex lock;28 29#ifdef CONFIG_XEN_GRANT_DMA_ALLOC30 /* Device for which DMA memory is allocated. */31 struct device *dma_dev;32#endif33 34#ifdef CONFIG_XEN_GNTDEV_DMABUF35 struct gntdev_dmabuf_priv *dmabuf_priv;36#endif37};38 39struct gntdev_unmap_notify {40 int flags;41 /* Address relative to the start of the gntdev_grant_map. */42 int addr;43 evtchn_port_t event;44};45 46struct gntdev_grant_map {47 atomic_t in_use;48 struct mmu_interval_notifier notifier;49 bool notifier_init;50 struct list_head next;51 int index;52 int count;53 int flags;54 refcount_t users;55 struct gntdev_unmap_notify notify;56 struct ioctl_gntdev_grant_ref *grants;57 struct gnttab_map_grant_ref *map_ops;58 struct gnttab_unmap_grant_ref *unmap_ops;59 struct gnttab_map_grant_ref *kmap_ops;60 struct gnttab_unmap_grant_ref *kunmap_ops;61 bool *being_removed;62 struct page **pages;63 unsigned long pages_vm_start;64 65#ifdef CONFIG_XEN_GRANT_DMA_ALLOC66 /*67 * If dmabuf_vaddr is not NULL then this mapping is backed by DMA68 * capable memory.69 */70 71 struct device *dma_dev;72 /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */73 int dma_flags;74 void *dma_vaddr;75 dma_addr_t dma_bus_addr;76 /* Needed to avoid allocation in gnttab_dma_free_pages(). */77 xen_pfn_t *frames;78#endif79 80 /* Number of live grants */81 atomic_t live_grants;82 /* Needed to avoid allocation in __unmap_grant_pages */83 struct gntab_unmap_queue_data unmap_data;84};85 86struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,87 int dma_flags);88 89void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add);90 91void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);92 93bool gntdev_test_page_count(unsigned int count);94 95int gntdev_map_grant_pages(struct gntdev_grant_map *map);96 97#endif98