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1/*
2 * rpc.h - RPC related operations
3 *
4 * Authors Mohamed Karaoui (2015)
5 *         Alain Greiner (2016)
6 *
7 * Copyright (c) UPMC Sorbonne Universites
8 *
9 * This file is part of ALMOS-MK.
10 *
11 * ALMOS-MK is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2.0 of the License.
14 *
15 * ALMOS-MK is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with ALMOS-MK; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#ifndef _RPC_H_
26#define _RPC_H_
27
28#include <errno.h>
29#include <types.h>
30#include <bits.h>
31#include <atomic.h>
32#include <spinlock.h>
33#include <remote_fifo.h>
34#include <kernel_config.h>
35
36/**********************************************************************************/
37/**************  structures for Remote Procedure Calls ****************************/
38/**********************************************************************************/
39
40/***********************************************************************************
41 *  This enum defines all RPC indexes (must be consistent with array in rpc.c)
42 **********************************************************************************/
43
44typedef enum
45{
46    RPC_PMEM_GET_PAGES         = 0,
47    RPC_PROCESS_PID_ALLOC      = 1,
48    RPC_PROCESS_MIGRATE        = 2,
49    RPC_THREAD_USER_CREATE     = 3,
50    RPC_VFAT_ALLOC_FAT_ENTRY   = 4,
51    RPC_VFAT_CLUSTER_COUNT     = 5,
52    RPC_VFS_LOOKUP_CHILD       = 6,
53    RPC_MAX_INDEX              = 7
54}
55rpc_index_t;
56
57/***********************************************************************************
58 *  This structure defines the RPC descriptor
59 **********************************************************************************/
60
61typedef struct rpc_desc_s
62{
63        rpc_index_t       index;      // index of requested RPC service
64        volatile uint32_t response;   // response valid when 0
65    uint64_t          args[7];    // input/output arguments buffer
66}
67rpc_desc_t;
68
69/***********************************************************************************
70 *  This structure defines the RPC fifo, the associated light lock,
71 *  and the intrumentation counter.
72 **********************************************************************************/
73
74typedef struct rpc_fifo_s
75{
76        spinlock_t lock;          // spinlock for the readers
77        uint64_t          count;  // total number of received RPCs (instrumentation)
78        remote_fifo_t     fifo;   // embedded remote fifo
79}
80rpc_fifo_t;
81
82
83/**********************************************************************************/
84/******* Generic functions supporting RPCs : client side **************************/
85/**********************************************************************************/
86
87/***********************************************************************************
88 * This blocking function executes on the client core.
89 * It puts one RPC extended pointer in the remote fifo.
90 * It sends an IPI if fifo is empty, and waits until RPC response available.
91 * The RPC descriptor must be allocated in the caller's stack
92 * and initialised by the caller.  Exit with a Panic message if remote fifo
93 * is still full after (CONFIG_RPC_PUT_MAX_ITERATIONS) retries.
94 * @ cxy   : server cluster identifier
95 * @ desc  : local pointer on RPC descriptor in client cluster
96 **********************************************************************************/
97void rpc_send_sync( cxy_t        cxy,   
98                    rpc_desc_t * desc );
99
100/***********************************************************************************
101 * This non blocking function is called by the scheduler of the client core
102 * to detect RPC completion. 
103 * @ ptr   : local pointer on the RPC descriptor in client cluster.
104 * @ return true if the client thread must resume (RPC completed).
105 **********************************************************************************/
106static bool_t rpc_callback( void * ptr );
107
108
109
110/**********************************************************************************/
111/******* Generic functions supporting RPCs : server side **************************/
112/**********************************************************************************/
113
114/***********************************************************************************
115 * This function initialises the local RPC fifo and the lock protecting readers.
116 * The number of slots is defined by the CONFIG_REMOTE_FIFO_SLOTS parameter.
117 * Each slot contains an extended pointer on the RPC descriptor.
118 * @ rf     : pointer on the local RPC fifo.
119 **********************************************************************************/
120void rpc_fifo_init( rpc_fifo_t * rf );
121
122/***********************************************************************************
123 * This function is the entry point for RPC handling on the server side.
124 * It can be executed by any thread running (in kernel mode) on any CPU.
125 * It first checks the CPU private RPC fifo, an then the cluster shared RPC fifo.
126 * It calls the rpc_activate_thread() function to activate a dedicated RPC thread,
127 * after registration of the selected RPC fifo in the selected thread descriptor.
128 * @ returns true if at least one RPC found / false otherwise.
129 **********************************************************************************/
130bool_t rpc_check();
131
132/***********************************************************************************
133 * This function contains the loop to execute all pending RPCs on the server side.
134 * It should be called with irq disabled and after light lock acquisition.
135 * @ rpc_fifo  : pointer on the local RPC fifo
136 * @ returns 0 if success
137 **********************************************************************************/
138error_r rpc_execute_all( rpc_fifo_t * rpc_fifo );
139
140/***********************************************************************************
141 * This function is acting as a demultiplexor on the server side.
142 * Depending on the RPC index stored in the RPC descriptor,
143 * it calls the relevant rpc_*_server() function.
144 * @ xptr : extended pointer on the RPC descriptor.
145 **********************************************************************************/
146void rpc_handle( xptr_t * xp );
147
148/**********************************************************************************
149 * This function activates one RPC thread to handle the pending RPC(s) contained
150 * in one RPC fifo (shared or private). It is called by any thread detecting
151 * a non-empty RPC fifo.
152 * It gets the first free RPC thread from the free-list, or creates a new one
153 * if the RPC thread free-list associated to the current cpu is empty.
154 * Finally, the calling thread immediately switches to the RPC thread.
155 * @ rpc_fifo : pointer on the non-empty RPC fifo.
156 * @ return 0 if success / return ENOMEM if error.
157 **********************************************************************************/
158error_t rpc_activate_thread( rpc_fifo_t * rpc_fifo );
159
160/***********************************************************************************
161 * This function defines the infinite loop executed by each RPC thread.
162 **********************************************************************************/
163void * rpc_thread();
164
165/**********************************************************************************
166 * This call-back function must be registered in the RPC thread descriptor.
167 * It is executed by the scheduler when the thread makes a sched_sleep() call,
168 * when the "before_sleep" field in thread descriptor is not NULL.
169 * It releases the light lock and print a debug message.
170 * @ thread  : local pointer on thread.
171 **********************************************************************************/
172void rpc_before_sleep( thread_t * thread );
173
174/**********************************************************************************
175 * This call-back function must be registered in the RPC thread descriptor.
176 * It is executed by the scheduler when the thread makes a wakeup(),
177 * when the "after_wakeup" field in thread descriptor is not NULL.
178 * It print a debug message.
179 * @ thread  : local pointer on thread.
180 **********************************************************************************/
181void rpc_after_wakeup( thread_t * thread );
182
183/**********************************************************************************/
184/******* Marshalling functions attached to the various RPCs ***********************/
185/**********************************************************************************/
186
187/***********************************************************************************
188 * The RPC_PMEM_GET_PAGES allocates one or several pages in a remote cluster,
189 * and returns the PPN of the first allocated page.
190 * @ cxy     : server cluster identifier
191 * @ order   : [in]  ln2( number of requested pages )
192 * @ status  : [out] error status (0 if success)
193 * @ ppn     : [out] first physical page number
194 **********************************************************************************/
195void rpc_pmem_get_pages_client( cxy_t      cxy,
196                                uint32_t   order,
197                                uint32_t * status,
198                                uint32_t * ppn );
199
200void rpc_pmem_get_pages_server( xptr_t xp );
201
202/***********************************************************************************
203 * The RPC_PROCESS_PID_ALLOC allocates one new PID in a remote cluster, registers
204 * the new process in the remote cluster, and returns the PID, and an error code.
205 * @ cxy     : server cluster identifier.
206 * @ process : [in]  pointer on process descriptor in client cluster.
207 * @ status  : [out] error status (0 if success).
208 * @ pid     : [out] new process identifier.
209 **********************************************************************************/
210void rpc_process_pid_alloc_client( cxy_t       cxy,
211                                   process_t * process,
212                                   error_t   * status,
213                                   pid_t     * pid );
214
215void rpc_process_pid_alloc_server( xptr_t xp );
216
217/***********************************************************************************
218 * The RPC_PROCESS_MIGRATE creates a process descriptor copy, in a remote cluster
219 * and initializes if from information found in the reference process descriptor.
220 * This remote cluster becomes the new reference cluster.
221 * @ cxy     : server cluster identifier.
222 * @ xp_ref  : [in]  extended pointer on reference process descriptor.
223 * @ status  : [out] error status (0 if success).
224 **********************************************************************************/
225void rpc_process_migrate_client( cxy_t       cxy,
226                                 xptr_t      xp_ref,
227                                 error_t   * status );
228
229void rpc_process_migrate_server( xptr_t xp );
230
231/***********************************************************************************
232 * The RPC_VFS_LOOKUP_CHILD returns in the lpr structure information on the
233 * the inode identified by the dentry name and the lkp structure.
234 * @ cxy     : server cluster identifier
235 * @ lkp     : [in]   pointer on input structure in client cluster
236 * @ name    : [in]   dentry name
237 * @ lpr     : [out]  pointer on output structure in client cluster
238 **********************************************************************************/
239void rpc_vfs_lookup_child_client( cxy_t                    cxy,
240                                  vfs_lookup_t          *  lkp,
241                                  char                  *  name,
242                                  vfs_lookup_response_t *  lpr );
243
244void rpc_vfs_lookup_child_server( xptr_t xp );
245
246/***********************************************************************************
247 * The RPC_THREAD_USER_CREATE creates an user thread in the server cluster,
248 * as specified by the pthread_attr_t argument. It returns an extended pointer
249 * on the thread descriptor in server cluster and an error code.
250 * @ cxy     : server cluster identifier.
251 * @ attr    : [in]   pointer on pthread_attr_t in client cluster.
252 * @ error   : [out] error status (0 if success).
253 * @ thread  : [out] extended pointer on thread descriptor.
254 **********************************************************************************/
255void rpc_thread_user_create_client( cxy_t             cxy,
256                                    pthread_attr_t *  attr,
257                                    error_t        *  error,
258                                    xptr_t         *  new_thread );
259
260void rpc_thread_user_create_server( xptr_t xp );
261
262
263
264#endif
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