source: trunk/kernel/kern/cluster.h @ 50

Last change on this file since 50 was 50, checked in by alain, 5 years ago

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1/*
2 * cluster.h - Cluster-Manager definition
3 *
4 * authors  Ghassan Almaless (2008,2009,2010,2011,2012)
5 *          Mohamed Lamine Karaoui (2015)
6 *          Alain Greiner (2016,2017)
7 *
8 * Copyright (c) UPMC Sorbonne Universites
9 *
10 * This file is part of ALMOS-MKH.
11 *
12 * ALMOS-MKH is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; version 2.0 of the License.
15 *
16 * ALMOS-MKH is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
23 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26#ifndef _CLUSTER_H_
27#define _CLUSTER_H_
28
29#include <kernel_config.h>
30#include <hal_types.h>
31#include <bits.h>
32#include <spinlock.h>
33#include <readlock.h>
34#include <remote_barrier.h>
35#include <list.h>
36#include <xlist.h>
37#include <dqdt.h>
38#include <kmem.h>
39#include <hal_atomic.h>
40#include <ppm.h>
41#include <kcm.h>
42#include <khm.h>
43#include <rpc.h>
44#include <core.h>
45#include <process.h>
46
47/**** Forward declarations  ****/
48
49struct core_s;
50struct process_s;
51
52
53/*******************************************************************************************
54 * This structure defines the process manager, that is part of the cluster manager.
55 * For any process P, the process descriptor is replicated in all clusters containing
56 * at least one thread of process P, but only the "reference" cluster descriptor contains
57 * the reference (complete) GPT, VSL, and FDT structures.
58 * The "owner" cluster K is in charge to allocate a lpid (local process index),
59 * to the owned processes, and to register the "reference" cluster for these processes.
60 *
61 * Warning : the "owner" cluster, and the "reference" cluster can be different clusters.
62 *
63 * The process manager of a cluster K maintains three structures:
64 * 1) The pref_tbl[] is an array indexed by lpid. There is one entry per owned process.
65 *    Each entry contains an extended pointer on the reference process descriptor.
66 *
67 * 2) The local_root is the root of the local list of process descriptors in cluster K.
68 *    A process descriptor P is present in K, as soon as P has a thread in cluster K.
69 *
70 * 3) The copies_root[] array is indexed by lpid. There is one entry per owned process,
71 *    and each each entry contains the root of the xlist of copies for this process.
72 ******************************************************************************************/
73
74typedef struct process_manager_s
75{
76        xptr_t            pref_tbl[CONFIG_MAX_PROCESS_PER_CLUSTER];  /*! reference  process   */
77        spinlock_t        pref_lock;              /*! lock protecting lpid allocation/release */
78    uint32_t          pref_nr;                /*! number of processes owned by cluster    */
79
80    xlist_entry_t     local_root;             /*! root of list of process in cluster      */
81    remote_spinlock_t local_lock;             /*! lock protecting access to local list    */
82    uint32_t          local_nr;               /*! number of process in cluster            */
83
84    xlist_entry_t     copies_root[CONFIG_MAX_PROCESS_PER_CLUSTER];  /*! roots of lists    */
85    remote_spinlock_t copies_lock[CONFIG_MAX_PROCESS_PER_CLUSTER];  /*! one lock per list */
86    uint32_t          copies_nr[CONFIG_MAX_PROCESS_PER_CLUSTER];    /*! number of copies  */
87}
88pmgr_t;
89
90/*******************************************************************************************
91 * This structure defines a cluster manager.
92 * It contains both global platform information, and cluster specific resources
93 * managed by the local kernel instance.
94 ******************************************************************************************/
95
96typedef struct cluster_s
97{
98        spinlock_t        kcm_lock;        /*! local, protect creation of KCM allocators      */
99
100    // global parameters
101
102        uint32_t          paddr_width;     /*! numer of bits in physical address              */
103    uint32_t          x_width;         /*! number of bits to code x_size  (can be 0)      */
104    uint32_t          y_width;         /*! number of bits to code y_size  (can be 0)      */
105        uint32_t          x_size;          /*! number of clusters in a row    (can be 1)      */
106        uint32_t          y_size;          /*! number of clusters in a column (can be 1)      */
107        cxy_t             io_cxy;          /*! io cluster identifier                          */
108    uint32_t          dqdt_root_level; /*! index of root node in dqdt_tbl[]               */
109
110    // local parameters
111
112        uint32_t          cores_nr;        /*! number of cores in cluster                     */
113    uint32_t          cores_in_kernel; /*! number of cores currently in kernel mode       */
114
115        core_t            core_tbl[CONFIG_MAX_LOCAL_CORES];         /*! embedded cores        */
116
117        ppm_t             ppm;             /*! embedded kernel page manager                   */
118        khm_t             khm;             /*! embedded kernel heap manager                   */
119        kcm_t             kcm;             /*! embedded kernel cache manager (for KCMs)       */
120
121    kcm_t           * kcm_tbl[KMEM_TYPES_NR];         /*! pointers on allocated KCMs      */
122
123    uint32_t          ram_size;        /*! physical memory size                           */
124    uint32_t          ram_base;        /*! physical memory base (local address)           */
125
126        rpc_fifo_t        rpc_fifo;        /*! cluster RPC fifo (shared)                      */
127        list_entry_t      devlist;         /*! root of list of devices in cluster             */
128
129    int32_t           pages_var;       /*! pages number increment from last DQQT update   */
130    int32_t           threads_var;     /*! threads number increment from last DQDT update */
131
132        dqdt_node_t       dqdt_tbl[CONFIG_MAX_DQDT_DEPTH];     /*! embedded DQDT nodes        */
133
134    pmgr_t            pmgr;            /*! embedded process manager                       */
135}
136cluster_t;
137
138/******************************************************************************************
139 * This global variable is allocated in the kernel_init.c file.
140 * There is one cluster_manager per cluster, with the same local address,
141 * but different content, in all clusters containing a kernel instance.
142 *****************************************************************************************/
143
144extern cluster_t cluster_manager;
145
146/******************************************************************************************
147 * This macro returns a local pointer on the local cluster manager.
148 *****************************************************************************************/
149
150#define LOCAL_CLUSTER    (&cluster_manager)
151
152/******************************************************************************************
153 * This generic function initialises the local cluster manager from information found
154 * in the local boot-info structure. It initializes the following local resources:
155 * - the global platform parameters,
156 * - the specific cluster parameters,
157 * - the lock protecting KCM creation,
158 * - the local DQDT nodes,
159 * - the PPM, KHM, and KCM allocators,
160 * - the local core descriptors,
161 * - the local RPC FIFO,
162 * - the process manager.
163 * It does NOT initialise the local device descriptors.
164 ******************************************************************************************
165 * @ info : pointer on the local boot_info_t structure build by the bootloader.
166 *****************************************************************************************/
167error_t cluster_init( boot_info_t * info );
168
169/******************************************************************************************
170 * This function checks the validity of a cluster identifier. TODO useful ??? [AG]
171 ******************************************************************************************
172 * @ cxy    : cluster identifier to be checked.
173 * @ returns true if the identified cluster does not exist.
174 *****************************************************************************************/
175bool_t cluster_is_undefined( cxy_t cxy );
176
177/******************************************************************************************
178 * This function register sysfs information in cluster TODO ???  [AG]
179 *****************************************************************************************/
180void cluster_sysfs_register();
181
182
183/*****************************************************************************************/
184/***************   Process Management Operations   ***************************************/
185/*****************************************************************************************/
186
187/******************************************************************************************
188 * This function returns an extended pointer on the reference process descriptor
189 * from the process PID. This PID can be be different from the calling thread process.
190 * It can be called by any thread running in any cluster,
191 ******************************************************************************************
192 * @ pid  : process identifier.
193 * @ return extended pointer on reference process if success / return XPTR_NULL if error.
194 *****************************************************************************************/
195xptr_t cluster_get_reference_process_from_pid( pid_t pid );
196
197/******************************************************************************************
198 * This function allocates a new PID in local cluster, that becomes the process owner.
199 * It registers the process descriptor extended pointer in the local processs manager
200 * pref_tbl[] array. This function is called by the rpc_process_alloc_pid() function for
201 * remote registration, or by the process_init_create() function for local registration.
202 ******************************************************************************************
203 * @ process    : [in]  extended pointer on the process descriptor.
204 * @ pid        : [out] allocated PID.
205 * @ return 0 if success / return EAGAIN if no PID slot available
206 *****************************************************************************************/
207error_t cluster_pid_alloc( xptr_t    process_xp,
208                           pid_t   * pid );
209
210/******************************************************************************************
211 * This function removes a PID from the local process manager pref_tbl[] array.
212 * It checks that removed process is owned by the local cluster and the lpid is legal.
213 * No memory is released by this function.
214 ******************************************************************************************
215 * @ pid        : allocated PID.
216 *****************************************************************************************/
217void cluster_pid_release( pid_t  pid );
218
219/******************************************************************************************
220 * This function returns a pointer on the local process descriptor from the PID.
221 * It uses the RPC
222 * to create a local process descriptor copy if it does not exist yet.
223 ******************************************************************************************
224 * @ pid     : searched process identifier.
225 * @ returns process descriptor pointer if found / returns NULL if not found.
226 *****************************************************************************************/
227struct process_s * cluster_get_local_process_from_pid( pid_t pid );
228
229/******************************************************************************************
230 * This function registers a local process descriptor in the process manager local_list.
231 ******************************************************************************************
232 * @ process     : pointer on local process descriptor.
233 *****************************************************************************************/
234void cluster_process_local_link( struct process_s * process );
235
236/******************************************************************************************
237 * This function removes a local process descriptor from the process manager local_list.
238 ******************************************************************************************
239 * @ process     : pointer on local process descriptor.
240 *****************************************************************************************/
241void cluster_process_local_unlink( struct process_s * process );
242
243/******************************************************************************************
244 * This function registers a local process descriptor in the owner process manager
245 * copies_list, that can be in a remote cluster.
246 ******************************************************************************************
247 * @ process     : pointer on local process descriptor.
248 *****************************************************************************************/
249void cluster_process_copies_link( struct process_s * process );
250
251/******************************************************************************************
252 * This function removes a local process descriptor from the owner process manager
253 * copies_list, that can be in a remote cluster.
254 ******************************************************************************************
255 * @ process     : pointer on local process descriptor.
256 *****************************************************************************************/
257void cluster_process_copies_unlink( struct process_s * process );
258
259
260
261/*****************************************************************************************/
262/***************   Cores Management Operations   *****************************************/
263/*****************************************************************************************/
264
265/******************************************************************************************
266 * This function increments the "cores_in_kernel" variable in cluster descriptor.
267 *****************************************************************************************/
268void cluster_core_kernel_enter();
269
270/******************************************************************************************
271 * This function decrements the "cores_in_kernel" variable in cluster descriptor.
272 *****************************************************************************************/
273void cluster_core_kernel_exit();
274
275/******************************************************************************************
276 * This function returns the core local index that has the lowest usage in local cluster.
277 *****************************************************************************************/
278lid_t cluster_select_local_core();
279
280#endif  /* _CLUSTER_H_ */
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