diff options
Diffstat (limited to 'drivers/infiniband/hw/hfi1/mmu_rb.h')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/mmu_rb.h | 91 |
1 files changed, 35 insertions, 56 deletions
diff --git a/drivers/infiniband/hw/hfi1/mmu_rb.h b/drivers/infiniband/hw/hfi1/mmu_rb.h index f04cec1e99d1..3fa50dd64db6 100644 --- a/drivers/infiniband/hw/hfi1/mmu_rb.h +++ b/drivers/infiniband/hw/hfi1/mmu_rb.h @@ -1,49 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ /* + * Copyright(c) 2020 Cornelis Networks, Inc. * Copyright(c) 2016 Intel Corporation. - * - * This file is provided under a dual BSD/GPLv2 license. When using or - * redistributing this file, you may do so under either license. - * - * GPL LICENSE SUMMARY - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of version 2 of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * BSD LICENSE - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * - Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * - Neither the name of Intel Corporation nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * */ + #ifndef _HFI1_MMU_RB_H #define _HFI1_MMU_RB_H @@ -54,35 +14,54 @@ struct mmu_rb_node { unsigned long len; unsigned long __last; struct rb_node node; + struct mmu_rb_handler *handler; struct list_head list; + struct kref refcount; }; -/* - * NOTE: filter, insert, invalidate, and evict must not sleep. Only remove is - * allowed to sleep. - */ +/* filter and evict must not sleep. Only remove is allowed to sleep. */ struct mmu_rb_ops { bool (*filter)(struct mmu_rb_node *node, unsigned long addr, unsigned long len); - int (*insert)(void *ops_arg, struct mmu_rb_node *mnode); void (*remove)(void *ops_arg, struct mmu_rb_node *mnode); - int (*invalidate)(void *ops_arg, struct mmu_rb_node *node); int (*evict)(void *ops_arg, struct mmu_rb_node *mnode, void *evict_arg, bool *stop); }; -int hfi1_mmu_rb_register(void *ops_arg, struct mm_struct *mm, - struct mmu_rb_ops *ops, +struct mmu_rb_handler { + /* + * struct mmu_notifier is 56 bytes, and spinlock_t is 4 bytes, so + * they fit together in one cache line. mn is relatively rarely + * accessed, so co-locating the spinlock with it achieves much of + * the cacheline contention reduction of giving the spinlock its own + * cacheline without the overhead of doing so. + */ + struct mmu_notifier mn; + spinlock_t lock; /* protect the RB tree */ + + /* Begin on a new cachline boundary here */ + struct rb_root_cached root ____cacheline_aligned_in_smp; + void *ops_arg; + const struct mmu_rb_ops *ops; + struct list_head lru_list; + struct work_struct del_work; + struct list_head del_list; + struct workqueue_struct *wq; + void *free_ptr; +}; + +int hfi1_mmu_rb_register(void *ops_arg, + const struct mmu_rb_ops *ops, struct workqueue_struct *wq, struct mmu_rb_handler **handler); void hfi1_mmu_rb_unregister(struct mmu_rb_handler *handler); int hfi1_mmu_rb_insert(struct mmu_rb_handler *handler, struct mmu_rb_node *mnode); +void hfi1_mmu_rb_release(struct kref *refcount); + void hfi1_mmu_rb_evict(struct mmu_rb_handler *handler, void *evict_arg); -void hfi1_mmu_rb_remove(struct mmu_rb_handler *handler, - struct mmu_rb_node *mnode); -bool hfi1_mmu_rb_remove_unless_exact(struct mmu_rb_handler *handler, - unsigned long addr, unsigned long len, - struct mmu_rb_node **rb_node); +struct mmu_rb_node *hfi1_mmu_rb_get_first(struct mmu_rb_handler *handler, + unsigned long addr, + unsigned long len); #endif /* _HFI1_MMU_RB_H */ |