97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/*
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* SPDX-FileCopyrightText: Copyright (c) 2020-22 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __NV_HASH_H__
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#define __NV_HASH_H__
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#include "conftest.h"
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#include "nv-list-helpers.h"
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/hash.h>
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#if defined(NV_LINUX_STRINGHASH_H_PRESENT)
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#include <linux/stringhash.h> /* full_name_hash() */
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#else
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#include <linux/dcache.h>
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#endif
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#if (NV_FULL_NAME_HASH_ARGUMENT_COUNT == 3)
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#define nv_string_hash(_str) full_name_hash(NULL, _str, strlen(_str))
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#else
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#define nv_string_hash(_str) full_name_hash(_str, strlen(_str))
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#endif
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/**
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* This naive hashtable was introduced by commit d9b482c8ba19 (v3.7, 2012-10-31).
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* To support older kernels import necessary functionality from
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* <linux/hashtable.h>.
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*/
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#define NV_HASH_SIZE(name) (ARRAY_SIZE(name))
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#define NV_HASH_BITS(name) ilog2(NV_HASH_SIZE(name))
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/* Use hash_32 when possible to allow for fast 32bit hashing in 64bit kernels. */
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#define NV_HASH_MIN(val, bits) \
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(sizeof(val) <= 4 ? hash_32(val, bits) : hash_long(val, bits))
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#define NV_DECLARE_HASHTABLE(name, bits) \
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struct hlist_head name[1 << (bits)]
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static inline void _nv_hash_init(struct hlist_head *ht, unsigned int sz)
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{
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unsigned int i;
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for (i = 0; i < sz; i++)
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{
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INIT_HLIST_HEAD(&ht[i]);
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}
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}
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/**
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* nv_hash_init - initialize a hash table
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* @hashtable: hashtable to be initialized
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*/
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#define nv_hash_init(hashtable) _nv_hash_init(hashtable, NV_HASH_SIZE(hashtable))
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/**
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* nv_hash_add - add an object to a hashtable
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* @hashtable: hashtable to add to
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* @node: the &struct hlist_node of the object to be added
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* @key: the key of the object to be added
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*/
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#define nv_hash_add(hashtable, node, key) \
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hlist_add_head(node, &hashtable[NV_HASH_MIN(key, NV_HASH_BITS(hashtable))])
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/**
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* nv_hash_for_each_possible - iterate over all possible objects hashing to the
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* same bucket
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* @name: hashtable to iterate
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* @obj: the type * to use as a loop cursor for each entry
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* @member: the name of the hlist_node within the struct
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* @key: the key of the objects to iterate over
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*/
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#define nv_hash_for_each_possible(name, obj, member, key) \
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hlist_for_each_entry(obj, &name[NV_HASH_MIN(key, NV_HASH_BITS(name))], member)
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#endif // __NV_HASH_H__
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