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