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 19 struct gntdev_dmabuf_priv; 20 21 struct gntdev_priv { 22 /* Maps with visible offsets in the file descriptor. */ 23 struct list_head maps; 24 /* 25 * Maps that are not visible; will be freed on munmap. 26 * Only populated if populate_freeable_maps == 1 27 */ 28 struct list_head freeable_maps; 29 /* lock protects maps and freeable_maps. */ 30 struct mutex lock; 31 struct mm_struct *mm; 32 struct mmu_notifier mn; 33 34 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC 35 /* Device for which DMA memory is allocated. */ 36 struct device *dma_dev; 37 #endif 38 39 #ifdef CONFIG_XEN_GNTDEV_DMABUF 40 struct gntdev_dmabuf_priv *dmabuf_priv; 41 #endif 42 }; 43 44 struct gntdev_unmap_notify { 45 int flags; 46 /* Address relative to the start of the gntdev_grant_map. */ 47 int addr; 48 int event; 49 }; 50 51 struct gntdev_grant_map { 52 struct list_head next; 53 struct vm_area_struct *vma; 54 int index; 55 int count; 56 int flags; 57 refcount_t users; 58 struct gntdev_unmap_notify notify; 59 struct ioctl_gntdev_grant_ref *grants; 60 struct gnttab_map_grant_ref *map_ops; 61 struct gnttab_unmap_grant_ref *unmap_ops; 62 struct gnttab_map_grant_ref *kmap_ops; 63 struct gnttab_unmap_grant_ref *kunmap_ops; 64 struct page **pages; 65 unsigned long pages_vm_start; 66 67 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC 68 /* 69 * If dmabuf_vaddr is not NULL then this mapping is backed by DMA 70 * capable memory. 71 */ 72 73 struct device *dma_dev; 74 /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */ 75 int dma_flags; 76 void *dma_vaddr; 77 dma_addr_t dma_bus_addr; 78 /* Needed to avoid allocation in gnttab_dma_free_pages(). */ 79 xen_pfn_t *frames; 80 #endif 81 }; 82 83 struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count, 84 int dma_flags); 85 86 void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add); 87 88 void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map); 89 90 bool gntdev_account_mapped_pages(int count); 91 92 int gntdev_map_grant_pages(struct gntdev_grant_map *map); 93 94 #endif 95