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 #include <xen/interface/event_channel.h> 19 #include <xen/grant_table.h> 20 21 struct gntdev_dmabuf_priv; 22 23 struct gntdev_priv { 24 /* Maps with visible offsets in the file descriptor. */ 25 struct list_head maps; 26 /* 27 * Maps that are not visible; will be freed on munmap. 28 * Only populated if populate_freeable_maps == 1 29 */ 30 struct list_head freeable_maps; 31 /* lock protects maps and freeable_maps. */ 32 struct mutex lock; 33 struct mm_struct *mm; 34 struct mmu_notifier mn; 35 36 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC 37 /* Device for which DMA memory is allocated. */ 38 struct device *dma_dev; 39 #endif 40 41 #ifdef CONFIG_XEN_GNTDEV_DMABUF 42 struct gntdev_dmabuf_priv *dmabuf_priv; 43 #endif 44 }; 45 46 struct gntdev_unmap_notify { 47 int flags; 48 /* Address relative to the start of the gntdev_grant_map. */ 49 int addr; 50 int event; 51 }; 52 53 struct gntdev_grant_map { 54 struct list_head next; 55 struct vm_area_struct *vma; 56 int index; 57 int count; 58 int flags; 59 refcount_t users; 60 struct gntdev_unmap_notify notify; 61 struct ioctl_gntdev_grant_ref *grants; 62 struct gnttab_map_grant_ref *map_ops; 63 struct gnttab_unmap_grant_ref *unmap_ops; 64 struct gnttab_map_grant_ref *kmap_ops; 65 struct gnttab_unmap_grant_ref *kunmap_ops; 66 bool *being_removed; 67 struct page **pages; 68 unsigned long pages_vm_start; 69 70 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC 71 /* 72 * If dmabuf_vaddr is not NULL then this mapping is backed by DMA 73 * capable memory. 74 */ 75 76 struct device *dma_dev; 77 /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */ 78 int dma_flags; 79 void *dma_vaddr; 80 dma_addr_t dma_bus_addr; 81 /* Needed to avoid allocation in gnttab_dma_free_pages(). */ 82 xen_pfn_t *frames; 83 #endif 84 85 /* Number of live grants */ 86 atomic_t live_grants; 87 /* Needed to avoid allocation in __unmap_grant_pages */ 88 struct gntab_unmap_queue_data unmap_data; 89 }; 90 91 struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count, 92 int dma_flags); 93 94 void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add); 95 96 void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map); 97 98 bool gntdev_account_mapped_pages(int count); 99 100 int gntdev_map_grant_pages(struct gntdev_grant_map *map); 101 102 #endif 103