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 12 struct 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 struct kref refcount; 20 }; 21 22 /* filter and evict must not sleep. Only remove is allowed to sleep. */ 23 struct mmu_rb_ops { 24 bool (*filter)(struct mmu_rb_node *node, unsigned long addr, 25 unsigned long len); 26 void (*remove)(void *ops_arg, struct mmu_rb_node *mnode); 27 int (*evict)(void *ops_arg, struct mmu_rb_node *mnode, 28 void *evict_arg, bool *stop); 29 }; 30 31 struct mmu_rb_handler { 32 /* 33 * struct mmu_notifier is 56 bytes, and spinlock_t is 4 bytes, so 34 * they fit together in one cache line. mn is relatively rarely 35 * accessed, so co-locating the spinlock with it achieves much of 36 * the cacheline contention reduction of giving the spinlock its own 37 * cacheline without the overhead of doing so. 38 */ 39 struct mmu_notifier mn; 40 spinlock_t lock; /* protect the RB tree */ 41 42 /* Begin on a new cachline boundary here */ 43 struct rb_root_cached root ____cacheline_aligned_in_smp; 44 void *ops_arg; 45 struct mmu_rb_ops *ops; 46 struct list_head lru_list; 47 struct work_struct del_work; 48 struct list_head del_list; 49 struct workqueue_struct *wq; 50 void *free_ptr; 51 }; 52 53 int hfi1_mmu_rb_register(void *ops_arg, 54 struct mmu_rb_ops *ops, 55 struct workqueue_struct *wq, 56 struct mmu_rb_handler **handler); 57 void hfi1_mmu_rb_unregister(struct mmu_rb_handler *handler); 58 int hfi1_mmu_rb_insert(struct mmu_rb_handler *handler, 59 struct mmu_rb_node *mnode); 60 void hfi1_mmu_rb_release(struct kref *refcount); 61 62 void hfi1_mmu_rb_evict(struct mmu_rb_handler *handler, void *evict_arg); 63 struct mmu_rb_node *hfi1_mmu_rb_get_first(struct mmu_rb_handler *handler, 64 unsigned long addr, 65 unsigned long len); 66 67 #endif /* _HFI1_MMU_RB_H */ 68