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 /* lock protects maps and freeable_maps. */ 25 struct mutex lock; 26 27 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC 28 /* Device for which DMA memory is allocated. */ 29 struct device *dma_dev; 30 #endif 31 32 #ifdef CONFIG_XEN_GNTDEV_DMABUF 33 struct gntdev_dmabuf_priv *dmabuf_priv; 34 #endif 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 { 45 struct mmu_interval_notifier notifier; 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_test_page_count(unsigned int count); 85 86 int gntdev_map_grant_pages(struct gntdev_grant_map *map); 87 88 #endif 89