This source file includes following definitions.
- ib_umem_offset
- ib_umem_num_pages
- ib_umem_get
- ib_umem_release
- ib_umem_page_count
- ib_umem_copy_from
- ib_umem_find_best_pgsz
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33 #ifndef IB_UMEM_H
34 #define IB_UMEM_H
35
36 #include <linux/list.h>
37 #include <linux/scatterlist.h>
38 #include <linux/workqueue.h>
39 #include <rdma/ib_verbs.h>
40
41 struct ib_ucontext;
42 struct ib_umem_odp;
43
44 struct ib_umem {
45 struct ib_device *ibdev;
46 struct mm_struct *owning_mm;
47 size_t length;
48 unsigned long address;
49 u32 writable : 1;
50 u32 is_odp : 1;
51 struct work_struct work;
52 struct sg_table sg_head;
53 int nmap;
54 unsigned int sg_nents;
55 };
56
57
58 static inline int ib_umem_offset(struct ib_umem *umem)
59 {
60 return umem->address & ~PAGE_MASK;
61 }
62
63 static inline size_t ib_umem_num_pages(struct ib_umem *umem)
64 {
65 return (ALIGN(umem->address + umem->length, PAGE_SIZE) -
66 ALIGN_DOWN(umem->address, PAGE_SIZE)) >>
67 PAGE_SHIFT;
68 }
69
70 #ifdef CONFIG_INFINIBAND_USER_MEM
71
72 struct ib_umem *ib_umem_get(struct ib_udata *udata, unsigned long addr,
73 size_t size, int access, int dmasync);
74 void ib_umem_release(struct ib_umem *umem);
75 int ib_umem_page_count(struct ib_umem *umem);
76 int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
77 size_t length);
78 unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem,
79 unsigned long pgsz_bitmap,
80 unsigned long virt);
81
82 #else
83
84 #include <linux/err.h>
85
86 static inline struct ib_umem *ib_umem_get(struct ib_udata *udata,
87 unsigned long addr, size_t size,
88 int access, int dmasync)
89 {
90 return ERR_PTR(-EINVAL);
91 }
92 static inline void ib_umem_release(struct ib_umem *umem) { }
93 static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
94 static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
95 size_t length) {
96 return -EINVAL;
97 }
98 static inline int ib_umem_find_best_pgsz(struct ib_umem *umem,
99 unsigned long pgsz_bitmap,
100 unsigned long virt) {
101 return -EINVAL;
102 }
103
104 #endif
105
106 #endif