LXR linux/include/rdma/ib

   1/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
   2/*
   3 * Copyright (c) 2007 Cisco Systems.  All rights reserved.
   4 */
   5
   6#ifndef IB_UMEM_H
   7#define IB_UMEM_H
   8
   9#include <linux/list.h>
  10#include <linux/scatterlist.h>
  11#include <linux/workqueue.h>
  12#include <rdma/ib_verbs.h>
  13
  14struct ib_ucontext;
  15struct ib_umem_odp;
  16
  17struct ib_umem {
  18        struct ib_device       *ibdev;
  19        struct mm_struct       *owning_mm;
  20        size_t                  length;
  21        unsigned long           address;
  22        u32 writable : 1;
  23        u32 is_odp : 1;
  24        struct work_struct      work;
  25        struct sg_table sg_head;
  26        int             nmap;
  27        unsigned int    sg_nents;
  28};
  29
  30/* Returns the offset of the umem start relative to the first page. */
  31static inline int ib_umem_offset(struct ib_umem *umem)
  32{
  33        return umem->address & ~PAGE_MASK;
  34}
  35
  36static inline size_t ib_umem_num_pages(struct ib_umem *umem)
  37{
  38        return (ALIGN(umem->address + umem->length, PAGE_SIZE) -
  39                ALIGN_DOWN(umem->address, PAGE_SIZE)) >>
  40               PAGE_SHIFT;
  41}
  42
  43#ifdef CONFIG_INFINIBAND_USER_MEM
  44
  45struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr,
  46                            size_t size, int access);
  47void ib_umem_release(struct ib_umem *umem);
  48int ib_umem_page_count(struct ib_umem *umem);
  49int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
  50                      size_t length);
  51unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem,
  52                                     unsigned long pgsz_bitmap,
  53                                     unsigned long virt);
  54
  55#else /* CONFIG_INFINIBAND_USER_MEM */
  56
  57#include <linux/err.h>
  58
  59static inline struct ib_umem *ib_umem_get(struct ib_device *device,
  60                                          unsigned long addr, size_t size,
  61                                          int access)
  62{
  63        return ERR_PTR(-EINVAL);
  64}
  65static inline void ib_umem_release(struct ib_umem *umem) { }
  66static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
  67static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
  68                                    size_t length) {
  69        return -EINVAL;
  70}
  71static inline int ib_umem_find_best_pgsz(struct ib_umem *umem,
  72                                         unsigned long pgsz_bitmap,
  73                                         unsigned long virt) {
  74        return -EINVAL;
  75}
  76
  77#endif /* CONFIG_INFINIBAND_USER_MEM */
  78
  79#endif /* IB_UMEM_H */
  80