/* 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> 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 { 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_test_page_count(unsigned int count); int gntdev_map_grant_pages(struct gntdev_grant_map *map); #endif