source: trunk/kernel/libk/grdxt.h @ 646

Last change on this file since 646 was 635, checked in by alain, 5 years ago

This version is a major evolution: The physical memory allocators,
defined in the kmem.c, ppm.c, and kcm.c files have been modified
to support remote accesses. The RPCs that were previously user
to allocate physical memory in a remote cluster have been removed.
This has been done to cure a dead-lock in case of concurrent page-faults.

This version 2.2 has been tested on a (4 clusters / 2 cores per cluster)
TSAR architecture, for both the "sort" and the "fft" applications.
File size: 10.2 KB
Line 
1/*
2 * grdxt.h - Three-levels Generic Radix-tree definition.
3 *
4 * Authors  Alain Greiner (2016,2017,2018,2019)
5 *
6 * Copyright  UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#ifndef _GRDXT_H_
25#define _GRDXT_H_
26
27#include <hal_kernel_types.h>
28
29/*******************************************************************************************
30 * This structure defines a three levels radix-tree descriptor.
31 * The key is split in three fields : ix1 (MSB) / ix2 / ix3 (LSB) to index the first,
32 * second and third level arrays respectively.
33 * The pointers on the registered items are stored in the third level arrays.
34 * The number or bits for each field are parameters for the grdxt_init() function.
35 * Memory for the first level array is allocated by the grdxt_init() function.
36 * Memory for the second and third levels arrays is dynamically allocated by the
37 * grdxt_insert() function and is only released by grdxt_destroy().
38 * This structure is entirely contained in one single cluster, but to allow any thread
39 * to access it, two sets of access functions are defined:
40 * - local threads can use access function using local pointers.
41 * - remote threads must use the access functions using extended pointers.
42 ******************************************************************************************
43 * When it is used by the mapper implementing the file cache:
44 * - the key is the page index in file.
45 * - the registered value is a local pointer on the page descriptor.
46 ******************************************************************************************/
47
48typedef struct grdxt_s
49{
50        void          ** root;           /*! pointer on first level array of pointers         */
51        uint32_t         ix1_width;      /*! number of bits for first level array index       */
52        uint32_t         ix2_width;      /*! number of bits for second level array index      */
53    uint32_t         ix3_width;      /*! number of bits for third level array index       */
54}
55grdxt_t;
56
57////////////////////////////////////////////////////////////////////////////////////////////
58//                       Local access functions
59////////////////////////////////////////////////////////////////////////////////////////////
60
61/*******************************************************************************************
62 * This function initialises the radix-tree descriptor,
63 * It must be called by a local thread.
64 * and allocates memory for the first level array of pointers.
65 *******************************************************************************************
66 * @ rt        : pointer on the radix-tree descriptor.
67 * @ ix1_width : number of bits in ix1 field
68 * @ ix2_width : number of bits in ix2 field
69 * @ ix3_width : number of bits in ix3 field
70 * @ returns 0 if success / returns ENOMEM if no more memory.     
71 ******************************************************************************************/
72error_t grdxt_init( grdxt_t  * rt,
73                    uint32_t   ix1_width,
74                    uint32_t   ix2_width,
75                    uint32_t   ix3_width );
76
77/*******************************************************************************************
78 * This function releases all memory allocated to the radix-tree infrastructure.
79 * It must be called by a local thread.
80 * A warning message is printed on the kernel TXT0 if the radix tree is not empty.
81 *******************************************************************************************
82 * @ rt      : pointer on the radix-tree descriptor.
83 ******************************************************************************************/
84void grdxt_destroy( grdxt_t * rt );
85
86/*******************************************************************************************
87 * This function insert a new item in the radix-tree.
88 * It must be called by a local thread.
89 * It dynamically allocates memory for new second and third level arrays if required.
90 *******************************************************************************************
91 * @ rt      : pointer on the radix-tree descriptor.
92 * @ key     : key value.
93 * @ value   : pointer on item to be registered in radix-tree.
94 * @ returns 0 if success / returns -1 if no memory, or illegal key.
95 ******************************************************************************************/
96error_t grdxt_insert( grdxt_t  * rt,
97                      uint32_t   key,
98                      void     * value );
99
100/*******************************************************************************************
101 * This function removes an item identified by its key from the radix tree,
102 * It must be called by a local thread.
103 * and returns a pointer on the removed item. No memory is released.
104 *******************************************************************************************
105 * @ rt      : pointer on the radix-tree descriptor.
106 * @ key     : key value.
107 * @ returns pointer on removed item if success / returns NULL if failure.
108 ******************************************************************************************/
109void * grdxt_remove( grdxt_t  * rt,
110                     uint32_t   key );
111
112/*******************************************************************************************
113 * This function returns to a local client, a local pointer on the item identified
114 * It must be called by a local thread.
115 * by the <key> argument, from the radix tree identified by the <rt> local pointer.
116 *******************************************************************************************
117 * @ rt      : local pointer on the radix-tree descriptor.
118 * @ key     : key value.
119 * @ returns a local pointer on found item if success / returns NULL if failure.
120 ******************************************************************************************/
121void * grdxt_lookup( grdxt_t  * rt, 
122                     uint32_t   key );
123
124/*******************************************************************************************
125 * This function scan all radix-tree entries in increasing key order, starting from
126 * It must be called by a local thread.
127 * the value defined by the <key> argument, and return a pointer on the first valid
128 * registered item, and the found item key value.
129 *******************************************************************************************
130 * @ rt         : pointer on the radix-tree descriptor.
131 * @ start_key  : key starting value for the scan.
132 * @ found_key  : [out] buffer for found key value.
133 * @ return pointer on first valid item if found / return NULL if not found.
134 ******************************************************************************************/
135void * grdxt_get_first( grdxt_t  * rt,
136                        uint32_t   start_key,
137                        uint32_t * found_key );
138
139////////////////////////////////////////////////////////////////////////////////////////////
140//                       Remote access functions
141////////////////////////////////////////////////////////////////////////////////////////////
142
143/*******************************************************************************************
144 * This function insert a new item in a - possibly remote - radix tree.
145 * It dynamically allocates memory for new second and third level arrays if required.
146 *******************************************************************************************
147 * @ rt_xp   : extended pointer on the radix-tree descriptor.
148 * @ key     : key value.
149 * @ value   : pointer on item to be registered in radix-tree.
150 * @ returns 0 if success / returns -1 if no memory, or illegal key.
151 ******************************************************************************************/
152error_t grdxt_remote_insert( xptr_t     rt_xp,
153                             uint32_t   key,
154                             void     * value );
155
156/*******************************************************************************************
157 * This function removes an item identified by its key from a - possibly remote - radix
158 * tree, and returns a local pointer on the removed item. No memory is released.
159 *******************************************************************************************
160 * @ rt_xp   : pointer on the radix-tree descriptor.
161 * @ key     : key value.
162 * @ returns local pointer on removed item if success / returns NULL if failure.
163 ******************************************************************************************/
164void * grdxt_remote_remove( xptr_t    rt_xp,
165                            uint32_t  key );
166
167/*******************************************************************************************
168 * This function returns to a - possibly remote - client, an extended pointer
169 * on the item identified by the <key> argument, from the radix tree identified by
170 * the <rt_xp> remote pointer.
171 *******************************************************************************************
172 * @ rt_xp   : extended pointer on the radix-tree descriptor.
173 * @ key     : key value.
174 * @ returns an extended pointer on found item if success / returns XPTR_NULL if failure.
175 ******************************************************************************************/
176xptr_t grdxt_remote_lookup( xptr_t     rt_xp, 
177                            uint32_t   key );
178
179/*******************************************************************************************
180 * This function displays the current content of a possibly remote radix_tree.
181 *******************************************************************************************
182 * @ rt      : extended pointer on the radix-tree descriptor.
183 * @ string  : radix tree identifier.
184 ******************************************************************************************/
185void grdxt_remote_display( xptr_t    rt_xp,
186                           char    * string );
187
188#endif  /* _GRDXT_H_ */
189
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