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 atomic_t in_use; 48 struct mmu_interval_notifier notifier; 49 bool notifier_init; 50 struct list_head next; 51 int index; 52 int count; 53 int flags; 54 refcount_t users; 55 struct gntdev_unmap_notify notify; 56 struct ioctl_gntdev_grant_ref *grants; 57 struct gnttab_map_grant_ref *map_ops; 58 struct gnttab_unmap_grant_ref *unmap_ops; 59 struct gnttab_map_grant_ref *kmap_ops; 60 struct gnttab_unmap_grant_ref *kunmap_ops; 61 bool *being_removed; 62 struct page **pages; 63 unsigned long pages_vm_start; 64 65 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC 66 /* 67 * If dmabuf_vaddr is not NULL then this mapping is backed by DMA 68 * capable memory. 69 */ 70 71 struct device *dma_dev; 72 /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */ 73 int dma_flags; 74 void *dma_vaddr; 75 dma_addr_t dma_bus_addr; 76 /* Needed to avoid allocation in gnttab_dma_free_pages(). */ 77 xen_pfn_t *frames; 78 #endif 79 80 /* Number of live grants */ 81 atomic_t live_grants; 82 /* Needed to avoid allocation in __unmap_grant_pages */ 83 struct gntab_unmap_queue_data unmap_data; 84 }; 85 86 struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count, 87 int dma_flags); 88 89 void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add); 90 91 void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map); 92 93 bool gntdev_test_page_count(unsigned int count); 94 95 int gntdev_map_grant_pages(struct gntdev_grant_map *map); 96 97 #endif 98