LXR linux/drivers/infiniband/hw/hfi1/mmu

   1/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
   2/*
   3 * Copyright(c) 2020 Cornelis Networks, Inc.
   4 * Copyright(c) 2016 Intel Corporation.
   5 */
   6
   7#ifndef _HFI1_MMU_RB_H
   8#define _HFI1_MMU_RB_H
   9
  10#include "hfi.h"
  11
  12struct mmu_rb_node {
  13        unsigned long addr;
  14        unsigned long len;
  15        unsigned long __last;
  16        struct rb_node node;
  17        struct mmu_rb_handler *handler;
  18        struct list_head list;
  19};
  20
  21/*
  22 * NOTE: filter, insert, invalidate, and evict must not sleep.  Only remove is
  23 * allowed to sleep.
  24 */
  25struct mmu_rb_ops {
  26        bool (*filter)(struct mmu_rb_node *node, unsigned long addr,
  27                       unsigned long len);
  28        int (*insert)(void *ops_arg, struct mmu_rb_node *mnode);
  29        void (*remove)(void *ops_arg, struct mmu_rb_node *mnode);
  30        int (*invalidate)(void *ops_arg, struct mmu_rb_node *node);
  31        int (*evict)(void *ops_arg, struct mmu_rb_node *mnode,
  32                     void *evict_arg, bool *stop);
  33};
  34
  35struct mmu_rb_handler {
  36        struct mmu_notifier mn;
  37        struct rb_root_cached root;
  38        void *ops_arg;
  39        spinlock_t lock;        /* protect the RB tree */
  40        struct mmu_rb_ops *ops;
  41        struct list_head lru_list;
  42        struct work_struct del_work;
  43        struct list_head del_list;
  44        struct workqueue_struct *wq;
  45};
  46
  47int hfi1_mmu_rb_register(void *ops_arg,
  48                         struct mmu_rb_ops *ops,
  49                         struct workqueue_struct *wq,
  50                         struct mmu_rb_handler **handler);
  51void hfi1_mmu_rb_unregister(struct mmu_rb_handler *handler);
  52int hfi1_mmu_rb_insert(struct mmu_rb_handler *handler,
  53                       struct mmu_rb_node *mnode);
  54void hfi1_mmu_rb_evict(struct mmu_rb_handler *handler, void *evict_arg);
  55void hfi1_mmu_rb_remove(struct mmu_rb_handler *handler,
  56                        struct mmu_rb_node *mnode);
  57bool hfi1_mmu_rb_remove_unless_exact(struct mmu_rb_handler *handler,
  58                                     unsigned long addr, unsigned long len,
  59                                     struct mmu_rb_node **rb_node);
  60
  61#endif /* _HFI1_MMU_RB_H */
  62