/*- * Copyright (c) 2010 Isilon Systems, Inc. * Copyright (c) 2010 iX Systems, Inc. * Copyright (c) 2010 Panasas, Inc. * Copyright (c) 2013-2016 Mellanox Technologies, Ltd. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice unmodified, this list of conditions, and the following * disclaimer. * 2. 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. * * $FreeBSD$ */ #ifndef _LINUX_IDR_H_ #define _LINUX_IDR_H_ #include #include #include #include #define IDR_BITS 5 #define IDR_SIZE (1 << IDR_BITS) #define IDR_MASK (IDR_SIZE - 1) #define MAX_ID_SHIFT ((sizeof(int) * NBBY) - 1) #define MAX_ID_BIT (1U << MAX_ID_SHIFT) #define MAX_ID_MASK (MAX_ID_BIT - 1) #define MAX_LEVEL (MAX_ID_SHIFT + IDR_BITS - 1) / IDR_BITS #define MAX_IDR_SHIFT (sizeof(int)*8 - 1) #define MAX_IDR_BIT (1U << MAX_IDR_SHIFT) #define MAX_IDR_MASK (MAX_IDR_BIT - 1) struct idr_layer { unsigned long bitmap; struct idr_layer *ary[IDR_SIZE]; }; struct idr { struct mtx lock; struct idr_layer *top; struct idr_layer *free; int layers; int next_cyclic_id; }; /* NOTE: It is the applications responsibility to destroy the IDR */ #define DEFINE_IDR(name) \ struct idr name; \ SYSINIT(name##_idr_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, \ idr_init, &(name)) /* NOTE: It is the applications responsibility to destroy the IDA */ #define DEFINE_IDA(name) \ struct ida name; \ SYSINIT(name##_ida_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, \ ida_init, &(name)) void idr_preload(gfp_t gfp_mask); void idr_preload_end(void); void *idr_find(struct idr *idp, int id); void *idr_get_next(struct idr *idp, int *nextid); bool idr_is_empty(struct idr *idp); int idr_pre_get(struct idr *idp, gfp_t gfp_mask); int idr_get_new(struct idr *idp, void *ptr, int *id); int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id); void *idr_replace(struct idr *idp, void *ptr, int id); void *idr_remove(struct idr *idp, int id); void idr_remove_all(struct idr *idp); void idr_destroy(struct idr *idp); void idr_init(struct idr *idp); int idr_alloc(struct idr *idp, void *ptr, int start, int end, gfp_t); int idr_alloc_cyclic(struct idr *idp, void *ptr, int start, int end, gfp_t); int idr_for_each(struct idr *idp, int (*fn)(int id, void *p, void *data), void *data); #define idr_for_each_entry(idp, entry, id) \ for ((id) = 0; ((entry) = idr_get_next(idp, &(id))) != NULL; ++(id)) #define IDA_CHUNK_SIZE 128 /* 128 bytes per chunk */ #define IDA_BITMAP_LONGS (IDA_CHUNK_SIZE / sizeof(long) - 1) #define IDA_BITMAP_BITS (IDA_BITMAP_LONGS * sizeof(long) * 8) struct ida_bitmap { long nr_busy; unsigned long bitmap[IDA_BITMAP_LONGS]; }; struct ida { struct idr idr; struct ida_bitmap *free_bitmap; }; int ida_pre_get(struct ida *ida, gfp_t gfp_mask); int ida_get_new_above(struct ida *ida, int starting_id, int *p_id); void ida_remove(struct ida *ida, int id); void ida_destroy(struct ida *ida); void ida_init(struct ida *ida); int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end, gfp_t gfp_mask); void ida_simple_remove(struct ida *ida, unsigned int id); static inline void ida_free(struct ida *ida, int id) { ida_remove(ida, id); } static inline int ida_get_new(struct ida *ida, int *p_id) { return (ida_get_new_above(ida, 0, p_id)); } static inline int ida_alloc_max(struct ida *ida, unsigned int max, gfp_t gfp) { return (ida_simple_get(ida, 0, max, gfp)); } static inline int ida_alloc(struct ida *ida, gfp_t gfp) { return (ida_alloc_max(ida, ~0u, gfp)); } static inline bool ida_is_empty(struct ida *ida) { return (idr_is_empty(&ida->idr)); } #endif /* _LINUX_IDR_H_ */