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 /**************************************************************************/
49 * @author Martin Molnar <molnam1@fel.cvut.cz>
50 * @date Wed Feb 18 16:21:01 2009
59 #include <fra_generic.h>
61 #include "aquosa/qres_lib.h"
62 #include "aqcpu_contract.h"
64 UL_LOG_CUST(ulogd_fra_aqcpu);
65 //ul_log_domain_t ulogd_fra_aqcpu = {UL_LOGL_MSG, "fra_aqcpu"};
67 static int aqcpu_initialized = 0; /* initialization flag */
70 * Test whether Aquosa Cpu modue is initialized
72 static inline int aqcpu_is_initialized()
74 return (aqcpu_initialized == 1);
79 static int aqcpu_create_vres(fres_vres_t *vres, void *priv)
81 aqcpu_params_t cpu_params;
85 /* get aqcpu params from contract */
86 get_aqcpu_params(vres, &cpu_params);
88 rv = qres_create_server(&cpu_params, &sid);
90 return qos_rv_int(rv);
93 printf("Created AQCPU VRES(sid=%d period=%lld us, budget=%lld us)\n",
94 sid, cpu_params.P, cpu_params.Q);
95 if ((vres->priv = malloc(sizeof(qres_sid_t)))) {
96 memcpy(vres->priv, &sid, sizeof(qres_sid_t));
103 * aqcpu_cancel_vres(), cancels vres
105 * The thread bound to the vres are unbound, and so, detached from their
106 * AQuoSA resource reservation servers and continue their execution according
107 * to the standard Linux scheduler policies.
110 static int aqcpu_cancel_vres(fres_vres_t *vres, void *priv)
119 memcpy(&sid, vres->priv, sizeof(qres_sid_t));
121 qrv = qres_destroy_server(sid);
123 return qos_rv_int(qrv);
125 printf("Canceled AQCPU VRES(sid=%d)\n",sid);
131 /* aqcpu_vres_change(), change some parameters of a vres
133 * In fact, since that AQuoSA call doesn't deal with _its_ Q_min (budget_min
134 * for in FRSH semantic) parameter all the renegotiation will be accepted but
135 * the new temporal behaviour is not guaranteed!
136 * Obviously this is a bug and should/will be corrected in AQuoSA as soon as
140 int aqcpu_change_vres(fres_vres_t *vres, void *priv)
142 aqcpu_params_t cpu_params;
150 memcpy(&sid, vres->priv, sizeof(qres_sid_t));
152 /* get aqcpu params from contract */
153 get_aqcpu_params(vres, &cpu_params);
156 qrv = qres_set_params(sid, &cpu_params);
158 ul_logmsg("AQCPU VRES(sid=%d) params changed(period=%lld us,"
159 "budget=%lld us)\n",sid, cpu_params.P,cpu_params.Q);
164 static struct fres_allocator aqcpu_allocator = {
165 .res_type = FRSH_RT_PROCESSOR,
166 .res_id = 0, /* CPU ID 0 */
167 .create_vres = aqcpu_create_vres,
168 .cancel_vres = aqcpu_cancel_vres,
169 .change_vres = aqcpu_change_vres,
174 * installed as an exit handler (with 'atexit()') by the initialization
175 * code... For now it only calls the cleanup function of the AQuoSA
178 static inline void aqcpu_cleanup_wrapper() {
183 * aqcpu_fra_init(), initialize FRSH for the calling process
185 * Must be called before starting using the framework.
186 * No FRSH call will be successful if this routine is not invoked
188 * Note that no BACKGROUND is created and negotiated and the caller thread
189 * is bound to no BACKGROUND vres, since no way is provided in order of
190 * specifying the contract label and get back the vres id!
192 * Note also that, since in this implementation the threads/processes with
193 * backgound contracts are left into the default Linux scheduler hands' and
194 * not attached to any AQuoSA server, while we're violating what D-AC2v1
195 * (pag. 14) says, we achieve exactly the same behaviour!!
197 * possible return values:
199 * FRSH_ERR_ALREADY_INITIALIZED
200 * FRSH_ERR_INTERNAL_ERROR (something, different from the previous case, gone wrong)
202 int aqcpu_fra_init(void)
207 if ((qrv = qres_init()) != QOS_OK) {
212 if ((rv = fra_register(&aqcpu_allocator))) {
217 /* install the cleanup function of th AQuoSA framework as an exit
218 * handler function (quite futile but, for now, it's sufficent) */
219 if (atexit(aqcpu_cleanup_wrapper))
220 return(FRSH_ERR_INTERNAL_ERROR);
222 aqcpu_initialized = 1;
232 return qos_rv_int(rv);