1 /*- 2 * Copyright (c) 2020 Mellanox Technologies, Ltd. 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 #ifndef _LINUXKPI_LINUX_XARRAY_H_ 27 #define _LINUXKPI_LINUX_XARRAY_H_ 28 29 #include <linux/gfp.h> 30 #include <linux/radix-tree.h> 31 #include <linux/err.h> 32 #include <linux/kconfig.h> 33 34 #include <sys/lock.h> 35 #include <sys/mutex.h> 36 37 #define XA_LIMIT(min, max) \ 38 ({ CTASSERT((min) == 0); (uint32_t)(max); }) 39 40 #define XA_FLAGS_ALLOC (1U << 0) 41 #define XA_FLAGS_LOCK_IRQ (1U << 1) 42 #define XA_FLAGS_ALLOC1 (1U << 2) 43 44 #define XA_ERROR(x) \ 45 ERR_PTR(x) 46 47 #define xa_is_err(x) \ 48 IS_ERR(x) 49 50 #define xa_limit_32b XA_LIMIT(0, 0xFFFFFFFF) 51 52 #define XA_ASSERT_LOCKED(xa) mtx_assert(&(xa)->xa_lock, MA_OWNED) 53 #define xa_lock(xa) mtx_lock(&(xa)->xa_lock) 54 #define xa_unlock(xa) mtx_unlock(&(xa)->xa_lock) 55 56 struct xarray { 57 struct radix_tree_root xa_head; 58 struct mtx xa_lock; /* internal mutex */ 59 uint32_t xa_flags; /* see XA_FLAGS_XXX */ 60 }; 61 62 /* 63 * Extensible arrays API implemented as a wrapper 64 * around the radix tree implementation. 65 */ 66 void *xa_erase(struct xarray *, uint32_t); 67 void *xa_load(struct xarray *, uint32_t); 68 int xa_alloc(struct xarray *, uint32_t *, void *, uint32_t, gfp_t); 69 int xa_alloc_cyclic(struct xarray *, uint32_t *, void *, uint32_t, uint32_t *, gfp_t); 70 int xa_alloc_cyclic_irq(struct xarray *, uint32_t *, void *, uint32_t, uint32_t *, gfp_t); 71 int xa_insert(struct xarray *, uint32_t, void *, gfp_t); 72 void *xa_store(struct xarray *, uint32_t, void *, gfp_t); 73 void xa_init_flags(struct xarray *, uint32_t); 74 bool xa_empty(struct xarray *); 75 void xa_destroy(struct xarray *); 76 void *xa_next(struct xarray *, unsigned long *, bool); 77 78 #define xa_for_each(xa, index, entry) \ 79 for ((entry) = NULL, (index) = 0; \ 80 ((entry) = xa_next(xa, &index, (entry) != NULL)) != NULL; ) 81 82 /* 83 * Unlocked version of functions above. 84 */ 85 void *__xa_erase(struct xarray *, uint32_t); 86 int __xa_alloc(struct xarray *, uint32_t *, void *, uint32_t, gfp_t); 87 int __xa_alloc_cyclic(struct xarray *, uint32_t *, void *, uint32_t, uint32_t *, gfp_t); 88 int __xa_insert(struct xarray *, uint32_t, void *, gfp_t); 89 void *__xa_store(struct xarray *, uint32_t, void *, gfp_t); 90 bool __xa_empty(struct xarray *); 91 void *__xa_next(struct xarray *, unsigned long *, bool); 92 93 #define xa_store_irq(xa, index, ptr, gfp) \ 94 xa_store((xa), (index), (ptr), (gfp)) 95 96 #define xa_erase_irq(xa, index) \ 97 xa_erase((xa), (index)) 98 99 #define xa_lock_irq(xa) xa_lock(xa) 100 #define xa_unlock_irq(xa) xa_unlock(xa) 101 102 #define xa_lock_irqsave(xa, flags) \ 103 do { \ 104 xa_lock((xa)); \ 105 flags = 0; \ 106 } while (0) 107 108 #define xa_unlock_irqrestore(xa, flags) \ 109 do { \ 110 xa_unlock((xa)); \ 111 flags == 0; \ 112 } while (0) 113 114 static inline int 115 xa_err(void *ptr) 116 { 117 return (PTR_ERR_OR_ZERO(ptr)); 118 } 119 120 static inline void 121 xa_init(struct xarray *xa) 122 { 123 xa_init_flags(xa, 0); 124 } 125 126 static inline void * 127 xa_mk_value(unsigned long v) 128 { 129 unsigned long r = (v << 1) | 1; 130 131 return ((void *)r); 132 } 133 134 static inline bool 135 xa_is_value(const void *e) 136 { 137 unsigned long v = (unsigned long)e; 138 139 return (v & 1); 140 } 141 142 static inline unsigned long 143 xa_to_value(const void *e) 144 { 145 unsigned long v = (unsigned long)e; 146 147 return (v >> 1); 148 } 149 #endif /* _LINUXKPI_LINUX_XARRAY_H_ */ 150