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Patch add idr (#56)
* 增加了idr模块 * 增加了IDR模块,并尝试覆盖上一个错误版本. * 增加了IDR模块 * 修改了test-idr.c文件 * 进一步完善函数注释 * 更新idr文档同时修改了test-idr的错误 * 将lz4库改为使用系统的clz函数 * idr和test-idr O1 * bugfix: 修复测试用例中的移位问题 * 修正问题 Signed-off-by: guanjinquan <1666320330@qq.com> Co-authored-by: fslongjin <longjin@RinGoTek.cn>
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@ -1,8 +1,16 @@
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#pragma GCC push_options
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#pragma GCC optimize("O1")
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#include <common/errno.h>
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#include <common/spinlock.h>
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#if ARCH(I386) || ARCH(X86_64)
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#include <arch/x86_64/math/bitcount.h>
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#else
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#error Arch not supported.
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#endif
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/**
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* idr: 基于radix-tree的ID-pointer的数据结构
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* 主要功能:
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@ -33,17 +41,17 @@
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#define MAX_ID_MASK (MAX_ID_BIT - 1)
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// IDR可能最大的层次 以及 IDR预分配空间的最大限制
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#define MAX_LEVEL (MAX_ID_SHIFT + IDR_BITS - 1) / IDR_BITS
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#define MAX_LEVEL ((MAX_ID_SHIFT + IDR_BITS - 1) / IDR_BITS)
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#define IDR_FREE_MAX (MAX_LEVEL << 1)
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// 给定layer, 计算完全64叉树的大小
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#define TREE_SIZE(layer) ((layer >= 0) ? (1ull << ((layer + 1) * IDR_BITS)) : 1)
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// 计算最后(最低位)一个1的位置 (注意使用64位的版本)
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#define __lowbit_id(x) ((x) ? (__builtin_ctzll(x)) : -1)
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#define __lowbit_id(x) ((x) ? (__ctzll(x)) : -1)
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// 计算最前(最高位)一个1的位置 (注意使用64位的版本)
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#define __mostbit_id(x) ((x) ? (__builtin_clzll(x)) : -1)
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#define __mostbit_id(x) ((x) ? (63 - __clzll(x)) : -1)
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// radix-tree 节点定义
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struct idr_layer
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@ -61,14 +69,11 @@ struct idr
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struct idr_layer *free_list;
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int id_free_cnt;
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spinlock_t lock;
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};
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}__attribute__((aligned(8)));
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#define DECLARE_IDR(name) \
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struct idr name = {0}; \
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name.top = (NULL); \
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name.free_list = (NULL); \
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name.id_free_cnt = (0); \
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spin_init(&name.lock);
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idr_init(&(name));
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#define DECLARE_IDR_LAYER(name) \
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struct idr_layer name = {0}; \
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@ -77,17 +82,43 @@ struct idr
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/**
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* 对外函数声明
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**/
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int idr_pre_get(struct idr *idp, gfp_t gfp_mask);
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int idr_get_new(struct idr *idp, void *ptr, int *id);
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void idr_remove(struct idr *idp, int id);
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int idr_preload(struct idr *idp, gfp_t gfp_mask);
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int idr_alloc(struct idr *idp, void *ptr, int *id);
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void *idr_remove(struct idr *idp, int id);
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void idr_remove_all(struct idr *idp);
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void idr_destroy(struct idr *idp);
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void *idr_find(struct idr *idp, int id);
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void *idr_find_next(struct idr *idp, int start_id);
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void *idr_find_next_getid(struct idr *idp, int start_id, int *nextid);
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void *idr_find_next_getid(struct idr *idp, int64_t start_id, int *nextid);
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int idr_replace_get_old(struct idr *idp, void *ptr, int id, void **oldptr);
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int idr_replace(struct idr *idp, void *ptr, int id);
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void idr_init(struct idr *idp);
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bool idr_empty(struct idr *idp);
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bool idr_count(struct idr *idp, int id);
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/**
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* 对外宏:遍历idr两种方式:
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* 1. 从第一个元素开始遍历
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* 2. 从某一个id开始遍历
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*/
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/**
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* @brief 第一种遍历方式: 从第一个元素开始遍历
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* @param idp idr指针
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* @param id 遍历的id,你不需要初始化这个id,因为它每一次都是从最小已分配的id开始遍历
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* @param ptr 数据指针(entry),你不需要初始化这个指针
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*/
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#define for_each_idr_entry(idp, id, ptr) \
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for (id = -1, ptr = idr_find_next_getid(idp, id, &id); ptr != NULL || !idr_count(idp, id); ptr = idr_find_next_getid(idp, id, &id))
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/**
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* @brief 第二种遍历方式: 从某一个id开始遍历
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* @param idp idr指针
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* @param id 遍历的id,你需要初始化这个id(请你设置为你要从哪一个id开始遍历,遍历过程将会包括这个id)
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* @param ptr 数据指针(entry),你不需要初始化这个指针
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*/
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#define for_each_idr_entry_continue(idp, id, ptr) \
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for (ptr = idr_find_next_getid(idp, id - 1, &id); ptr != NULL || !idr_count(idp, id); ptr = idr_find_next_getid(idp, id, &id))
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/**
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* ida: 基于IDR实现的ID分配器
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@ -132,8 +163,11 @@ struct ida
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* 对外函数声明
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*/
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void ida_init(struct ida *ida_p);
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int ida_pre_get(struct ida *ida_p, gfp_t gfp_mask);
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int ida_get_new(struct ida *ida_p, int *p_id);
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bool ida_empty(struct ida *ida_p);
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int ida_preload(struct ida *ida_p, gfp_t gfp_mask);
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int ida_alloc(struct ida *ida_p, int *p_id);
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bool ida_count(struct ida *ida_p, int id);
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void ida_remove(struct ida *ida_p, int id);
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void ida_destroy(struct ida *ida_p);
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void ida_destroy(struct ida *ida_p);
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#pragma GCC pop_options
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