diff options
Diffstat (limited to 'drivers/infiniband/hw/hfi1/mmu_rb.h')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/mmu_rb.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/mmu_rb.h b/drivers/infiniband/hw/hfi1/mmu_rb.h new file mode 100644 index 000000000..be85537d2 --- /dev/null +++ b/drivers/infiniband/hw/hfi1/mmu_rb.h @@ -0,0 +1,103 @@ +/* + * 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 + +#include "hfi.h" + +struct mmu_rb_node { + unsigned long addr; + 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. + */ +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); +}; + +struct mmu_rb_handler { + struct mmu_notifier mn; + struct rb_root_cached root; + void *ops_arg; + spinlock_t lock; /* protect the RB tree */ + struct mmu_rb_ops *ops; + struct list_head lru_list; + struct work_struct del_work; + struct list_head del_list; + struct workqueue_struct *wq; +}; + +int hfi1_mmu_rb_register(void *ops_arg, + 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); +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 */ |