| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | /* |
| 27 | * Maps that are not visible; will be freed on munmap. |
| 28 | * Only populated if populate_freeable_maps == 1 |
| 29 | */ |
| 30 | struct list_head freeable_maps; |
| 31 | /* lock protects maps and freeable_maps. */ |
| 32 | struct mutex lock; |
| 33 | struct mm_struct *mm; |
| 34 | struct mmu_notifier mn; |
| 35 | |
| 36 | #ifdef CONFIG_XEN_GRANT_DMA_ALLOC |
| 37 | /* Device for which DMA memory is allocated. */ |
| 38 | struct device *dma_dev; |
| 39 | #endif |
| 40 | |
| 41 | #ifdef CONFIG_XEN_GNTDEV_DMABUF |
| 42 | struct gntdev_dmabuf_priv *dmabuf_priv; |
| 43 | #endif |
| 44 | }; |
| 45 | |
| 46 | struct gntdev_unmap_notify { |
| 47 | int flags; |
| 48 | /* Address relative to the start of the gntdev_grant_map. */ |
| 49 | int addr; |
| 50 | int event; |
| 51 | }; |
| 52 | |
| 53 | struct gntdev_grant_map { |
| 54 | struct list_head next; |
| 55 | struct vm_area_struct *vma; |
| 56 | int index; |
| 57 | int count; |
| 58 | int flags; |
| 59 | refcount_t users; |
| 60 | struct gntdev_unmap_notify notify; |
| 61 | struct ioctl_gntdev_grant_ref *grants; |
| 62 | struct gnttab_map_grant_ref *map_ops; |
| 63 | struct gnttab_unmap_grant_ref *unmap_ops; |
| 64 | struct gnttab_map_grant_ref *kmap_ops; |
| 65 | struct gnttab_unmap_grant_ref *kunmap_ops; |
| 66 | bool *being_removed; |
| 67 | struct page **pages; |
| 68 | unsigned long pages_vm_start; |
| 69 | |
| 70 | #ifdef CONFIG_XEN_GRANT_DMA_ALLOC |
| 71 | /* |
| 72 | * If dmabuf_vaddr is not NULL then this mapping is backed by DMA |
| 73 | * capable memory. |
| 74 | */ |
| 75 | |
| 76 | struct device *dma_dev; |
| 77 | /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */ |
| 78 | int dma_flags; |
| 79 | void *dma_vaddr; |
| 80 | dma_addr_t dma_bus_addr; |
| 81 | /* Needed to avoid allocation in gnttab_dma_free_pages(). */ |
| 82 | xen_pfn_t *frames; |
| 83 | #endif |
| 84 | |
| 85 | /* Number of live grants */ |
| 86 | atomic_t live_grants; |
| 87 | /* Needed to avoid allocation in __unmap_grant_pages */ |
| 88 | struct gntab_unmap_queue_data unmap_data; |
| 89 | }; |
| 90 | |
| 91 | struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count, |
| 92 | int dma_flags); |
| 93 | |
| 94 | void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add); |
| 95 | |
| 96 | void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map); |
| 97 | |
| 98 | bool gntdev_account_mapped_pages(int count); |
| 99 | |
| 100 | int gntdev_map_grant_pages(struct gntdev_grant_map *map); |
| 101 | |
| 102 | #endif |