1 /**************************************************************************/
2 /* ---------------------------------------------------------------------- */
3 /* Copyright (C) 2006 - 2008 FRESCOR consortium partners: */
5 /* Universidad de Cantabria, SPAIN */
6 /* University of York, UK */
7 /* Scuola Superiore Sant'Anna, ITALY */
8 /* Kaiserslautern University, GERMANY */
9 /* Univ. Politécnica Valencia, SPAIN */
10 /* Czech Technical University in Prague, CZECH REPUBLIC */
12 /* Thales Communication S.A. FRANCE */
13 /* Visual Tools S.A. SPAIN */
14 /* Rapita Systems Ltd UK */
17 /* See http://www.frescor.org for a link to partners' websites */
19 /* FRESCOR project (FP6/2005/IST/5-034026) is funded */
20 /* in part by the European Union Sixth Framework Programme */
21 /* The European Union is not liable of any use that may be */
22 /* made of this code. */
25 /* This file is part of AQCPU (Aquosa CPU) */
27 /* FWP is free software; you can redistribute it and/or modify it */
28 /* under terms of the GNU General Public License as published by the */
29 /* Free Software Foundation; either version 2, or (at your option) any */
30 /* later version. FWP is distributed in the hope that it will be */
31 /* useful, but WITHOUT ANY WARRANTY; without even the implied warranty */
32 /* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU */
33 /* General Public License for more details. You should have received a */
34 /* copy of the GNU General Public License along with FWP; see file */
35 /* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, */
36 /* Cambridge, MA 02139, USA. */
38 /* As a special exception, including AQCPU header files in a file, */
39 /* instantiating FWP generics or templates, or linking other files */
40 /* with FWP objects to produce an executable application, does not */
41 /* by itself cause the resulting executable application to be covered */
42 /* by the GNU General Public License. This exception does not */
43 /* however invalidate any other reasons why the executable file might be */
44 /* covered by the GNU Public License. */
45 /**************************************************************************/
47 #include <fra_generic.h>
49 #include "aquosa/qres_lib.h"
50 #include "aqcpu_contract.h"
52 UL_LOG_CUST(ulogd_fra_aqcpu);
53 //ul_log_domain_t ulogd_fra_aqcpu = {UL_LOGL_MSG, "fra_aqcpu"};
55 static int aqcpu_initialized = 0; /* initialization flag */
58 * Test whether Aquosa Cpu modue is initialized
60 static inline int aqcpu_is_initialized()
62 return (aqcpu_initialized == 1);
67 static int aqcpu_create_vres(fres_vres_t *vres, void *priv)
69 aqcpu_params_t cpu_params;
73 /* get aqcpu params from contract */
74 get_aqcpu_params(vres, &cpu_params);
76 rv = qres_create_server(&cpu_params, &sid);
78 return qos_rv_int(rv);
81 printf("Created AQCPU VRES(sid=%d period=%lld us, budget=%lld us)\n",
82 sid, cpu_params.P, cpu_params.Q);
83 if ((vres->priv = malloc(sizeof(qres_sid_t)))) {
84 memcpy(vres->priv, &sid, sizeof(qres_sid_t));
91 * aqcpu_cancel_vres(), cancels vres
93 * The thread bound to the vres are unbound, and so, detached from their
94 * AQuoSA resource reservation servers and continue their execution according
95 * to the standard Linux scheduler policies.
98 static int aqcpu_cancel_vres(fres_vres_t *vres, void *priv)
107 memcpy(&sid, vres->priv, sizeof(qres_sid_t));
109 qrv = qres_destroy_server(sid);
111 return qos_rv_int(qrv);
113 printf("Canceled AQCPU VRES(sid=%d)\n",sid);
119 /* aqcpu_vres_change(), change some parameters of a vres
121 * In fact, since that AQuoSA call doesn't deal with _its_ Q_min (budget_min
122 * for in FRSH semantic) parameter all the renegotiation will be accepted but
123 * the new temporal behaviour is not guaranteed!
124 * Obviously this is a bug and should/will be corrected in AQuoSA as soon as
128 int aqcpu_change_vres(fres_vres_t *vres, void *priv)
130 aqcpu_params_t cpu_params;
138 memcpy(&sid, vres->priv, sizeof(qres_sid_t));
140 /* get aqcpu params from contract */
141 get_aqcpu_params(vres, &cpu_params);
144 qrv = qres_set_params(sid, &cpu_params);
146 ul_logmsg("AQCPU VRES(sid=%d) params changed(period=%lld us,"
147 "budget=%lld us)\n",sid, cpu_params.P,cpu_params.Q);
152 static struct fres_allocator aqcpu_allocator = {
153 .res_type = FRSH_RT_PROCESSOR,
154 .res_id = 0, /* CPU ID 0 */
155 .create_vres = aqcpu_create_vres,
156 .cancel_vres = aqcpu_cancel_vres,
157 .change_vres = aqcpu_change_vres,
162 * installed as an exit handler (with 'atexit()') by the initialization
163 * code... For now it only calls the cleanup function of the AQuoSA
166 static inline void aqcpu_cleanup_wrapper() {
171 * aqcpu_fra_init(), initialize FRSH for the calling process
173 * Must be called before starting using the framework.
174 * No FRSH call will be successful if this routine is not invoked
176 * Note that no BACKGROUND is created and negotiated and the caller thread
177 * is bound to no BACKGROUND vres, since no way is provided in order of
178 * specifying the contract label and get back the vres id!
180 * Note also that, since in this implementation the threads/processes with
181 * backgound contracts are left into the default Linux scheduler hands' and
182 * not attached to any AQuoSA server, while we're violating what D-AC2v1
183 * (pag. 14) says, we achieve exactly the same behaviour!!
185 * possible return values:
187 * FRSH_ERR_ALREADY_INITIALIZED
188 * FRSH_ERR_INTERNAL_ERROR (something, different from the previous case, gone wrong)
190 int aqcpu_fra_init(void)
195 if ((qrv = qres_init()) != QOS_OK) {
200 if ((rv = fra_register(&aqcpu_allocator))) {
205 /* install the cleanup function of th AQuoSA framework as an exit
206 * handler function (quite futile but, for now, it's sufficent) */
207 if (atexit(aqcpu_cleanup_wrapper))
208 return(FRSH_ERR_INTERNAL_ERROR);
210 aqcpu_initialized = 1;
220 return qos_rv_int(rv);