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 /* lock protects maps and freeable_maps. */ 27 struct mutex lock; 28 29 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC 30 /* Device for which DMA memory is allocated. */ 31 struct device *dma_dev; 32 #endif 33 34 #ifdef CONFIG_XEN_GNTDEV_DMABUF 35 struct gntdev_dmabuf_priv *dmabuf_priv; 36 #endif 37 }; 38 39 struct 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 46 struct gntdev_grant_map { 47 struct mmu_interval_notifier notifier; 48 struct list_head next; 49 struct vm_area_struct *vma; 50 int index; 51 int count; 52 int flags; 53 refcount_t users; 54 struct gntdev_unmap_notify notify; 55 struct ioctl_gntdev_grant_ref *grants; 56 struct gnttab_map_grant_ref *map_ops; 57 struct gnttab_unmap_grant_ref *unmap_ops; 58 struct gnttab_map_grant_ref *kmap_ops; 59 struct gnttab_unmap_grant_ref *kunmap_ops; 60 bool *being_removed; 61 struct page **pages; 62 unsigned long pages_vm_start; 63 64 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC 65 /* 66 * If dmabuf_vaddr is not NULL then this mapping is backed by DMA 67 * capable memory. 68 */ 69 70 struct device *dma_dev; 71 /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */ 72 int dma_flags; 73 void *dma_vaddr; 74 dma_addr_t dma_bus_addr; 75 /* Needed to avoid allocation in gnttab_dma_free_pages(). */ 76 xen_pfn_t *frames; 77 #endif 78 79 /* Number of live grants */ 80 atomic_t live_grants; 81 /* Needed to avoid allocation in __unmap_grant_pages */ 82 struct gntab_unmap_queue_data unmap_data; 83 }; 84 85 struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count, 86 int dma_flags); 87 88 void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add); 89 90 void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map); 91 92 bool gntdev_test_page_count(unsigned int count); 93 94 int gntdev_map_grant_pages(struct gntdev_grant_map *map); 95 96 #endif 97