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 /* Free instances of struct gntdev_copy_batch. */ 30 struct gntdev_copy_batch *batch; 31 struct mutex batch_lock; 32 33 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC 34 /* Device for which DMA memory is allocated. */ 35 struct device *dma_dev; 36 #endif 37 38 #ifdef CONFIG_XEN_GNTDEV_DMABUF 39 struct gntdev_dmabuf_priv *dmabuf_priv; 40 #endif 41 }; 42 43 struct gntdev_unmap_notify { 44 int flags; 45 /* Address relative to the start of the gntdev_grant_map. */ 46 int addr; 47 evtchn_port_t event; 48 }; 49 50 struct gntdev_grant_map { 51 atomic_t in_use; 52 struct mmu_interval_notifier notifier; 53 bool notifier_init; 54 struct list_head next; 55 int index; 56 int count; 57 int flags; 58 refcount_t users; 59 struct gntdev_unmap_notify notify; 60 struct ioctl_gntdev_grant_ref *grants; 61 struct gnttab_map_grant_ref *map_ops; 62 struct gnttab_unmap_grant_ref *unmap_ops; 63 struct gnttab_map_grant_ref *kmap_ops; 64 struct gnttab_unmap_grant_ref *kunmap_ops; 65 bool *being_removed; 66 struct page **pages; 67 unsigned long pages_vm_start; 68 69 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC 70 /* 71 * If dmabuf_vaddr is not NULL then this mapping is backed by DMA 72 * capable memory. 73 */ 74 75 struct device *dma_dev; 76 /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */ 77 int dma_flags; 78 void *dma_vaddr; 79 dma_addr_t dma_bus_addr; 80 /* Needed to avoid allocation in gnttab_dma_free_pages(). */ 81 xen_pfn_t *frames; 82 #endif 83 84 /* Number of live grants */ 85 atomic_t live_grants; 86 /* Needed to avoid allocation in __unmap_grant_pages */ 87 struct gntab_unmap_queue_data unmap_data; 88 }; 89 90 struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count, 91 int dma_flags); 92 93 void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add); 94 95 void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map); 96 97 bool gntdev_test_page_count(unsigned int count); 98 99 int gntdev_map_grant_pages(struct gntdev_grant_map *map); 100 101 #endif 102