1 /* 2 * Copyright (c) 2013-2016 François Tigeot 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUX_IDR_H_ 28 #define _LINUX_IDR_H_ 29 30 #include <sys/idr.h> 31 32 MALLOC_DECLARE(M_IDR); 33 34 #define IDA_CHUNK_SIZE 128 /* 128 bytes per chunk */ 35 #define IDA_BITMAP_LONGS (IDA_CHUNK_SIZE / sizeof(long) - 1) 36 #define IDA_BITMAP_BITS (IDA_BITMAP_LONGS * sizeof(long) * 8) 37 38 struct ida_bitmap { 39 long nr_busy; 40 unsigned long bitmap[IDA_BITMAP_LONGS]; 41 }; 42 43 struct ida { 44 struct idr idr; 45 struct ida_bitmap *free_bitmap; 46 }; 47 48 static inline void 49 ida_init(struct ida *ida) 50 { 51 idr_init(&ida->idr); 52 } 53 54 static inline void 55 ida_simple_remove(struct ida *ida, unsigned int id) 56 { 57 idr_remove(&ida->idr, id); 58 } 59 60 static inline void 61 ida_remove(struct ida *ida, int id) 62 { 63 idr_remove(&ida->idr, id); 64 } 65 66 static inline void 67 ida_destroy(struct ida *ida) 68 { 69 idr_destroy(&ida->idr); 70 if (ida->free_bitmap != NULL) { 71 /* kfree() is a linux macro! Work around the cpp pass */ 72 (kfree)(ida->free_bitmap, M_IDR); 73 } 74 } 75 76 static inline int 77 ida_simple_get(struct ida *ida, unsigned int start, unsigned int end, gfp_t gfp_mask) 78 { 79 int id; 80 unsigned int lim; 81 82 if ((end == 0) || (end > 0x80000000)) 83 lim = 0x80000000; 84 else 85 lim = end - 1; 86 87 idr_preload(gfp_mask); 88 id = idr_alloc(&ida->idr, NULL, start, lim, gfp_mask); 89 idr_preload_end(); 90 91 return id; 92 } 93 94 #endif /* _LINUX_IDR_H_ */ 95