diff options
Diffstat (limited to 'sys/compat/linuxkpi/common/include/linux/idr.h')
| -rw-r--r-- | sys/compat/linuxkpi/common/include/linux/idr.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/idr.h b/sys/compat/linuxkpi/common/include/linux/idr.h new file mode 100644 index 000000000000..535d8ce07fb4 --- /dev/null +++ b/sys/compat/linuxkpi/common/include/linux/idr.h @@ -0,0 +1,162 @@ +/*- + * 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. + */ +#ifndef _LINUXKPI_LINUX_IDR_H_ +#define _LINUXKPI_LINUX_IDR_H_ + +#include <sys/param.h> +#include <sys/lock.h> +#include <sys/limits.h> +#include <sys/mutex.h> + +#include <linux/radix-tree.h> +#include <linux/gpf.h> +#include <linux/types.h> + +#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_min(struct ida *ida, unsigned int min, gfp_t gfp) +{ + return (ida_simple_get(ida, min, UINT_MAX, gfp)); +} + +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 /* _LINUXKPI_LINUX_IDR_H_ */ |