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 "aquosa/qsup_lib.h"
64 #include "aqcpu_contract.h"
66 UL_LOG_CUST(ulogd_fra_aqcpu);
67 //ul_log_domain_t ulogd_fra_aqcpu = {UL_LOGL_MSG, "fra_aqcpu"};
69 static int aqcpu_initialized = 0; /* initialization flag */
72 * Test whether Aquosa Cpu modue is initialized
74 static inline int aqcpu_is_initialized()
76 return (aqcpu_initialized == 1);
81 static int aqcpu_create_vres(fres_vres_t *vres, void *priv)
83 aqcpu_params_t cpu_params;
87 /* get aqcpu params from contract */
88 get_aqcpu_params(vres, &cpu_params);
90 rv = qres_create_server(&cpu_params, &sid);
92 return qos_rv_int(rv);
95 printf("Created AQCPU VRES(sid=%d period=%lld us, budget=%lld us)\n",
96 sid, cpu_params.P, cpu_params.Q);
97 if ((vres->priv = malloc(sizeof(qres_sid_t)))) {
98 memcpy(vres->priv, &sid, sizeof(qres_sid_t));
105 * aqcpu_cancel_vres(), cancels vres
107 * The thread bound to the vres are unbound, and so, detached from their
108 * AQuoSA resource reservation servers and continue their execution according
109 * to the standard Linux scheduler policies.
112 static int aqcpu_cancel_vres(fres_vres_t *vres, void *priv)
121 memcpy(&sid, vres->priv, sizeof(qres_sid_t));
123 qrv = qres_destroy_server(sid);
125 return qos_rv_int(qrv);
127 printf("Canceled AQCPU VRES(sid=%d)\n",sid);
133 /* aqcpu_vres_change(), change some parameters of a vres
135 * In fact, since that AQuoSA call doesn't deal with _its_ Q_min (budget_min
136 * for in FRSH semantic) parameter all the renegotiation will be accepted but
137 * the new temporal behaviour is not guaranteed!
138 * Obviously this is a bug and should/will be corrected in AQuoSA as soon as
142 int aqcpu_change_vres(fres_vres_t *vres, void *priv)
144 aqcpu_params_t cpu_params;
152 memcpy(&sid, vres->priv, sizeof(qres_sid_t));
154 /* get aqcpu params from contract */
155 get_aqcpu_params(vres, &cpu_params);
158 qrv = qres_set_params(sid, &cpu_params);
160 ul_logmsg("AQCPU VRES(sid=%d) params changed(period=%lld us,"
161 "budget=%lld us)\n",sid, cpu_params.P,cpu_params.Q);
166 static struct fres_allocator aqcpu_allocator = {
167 .res_type = FRSH_RT_PROCESSOR,
168 .res_id = 0, /* CPU ID 0 */
169 .create_vres = aqcpu_create_vres,
170 .cancel_vres = aqcpu_cancel_vres,
171 .change_vres = aqcpu_change_vres,
176 * installed as an exit handler (with 'atexit()') by the initialization
177 * code... For now it only calls the cleanup function of the AQuoSA
180 static inline void aqcpu_cleanup_wrapper() {
185 * aqcpu_fra_init(), initialize FRSH for the calling process
187 * Must be called before starting using the framework.
188 * No FRSH call will be successful if this routine is not invoked
190 * Note that no BACKGROUND is created and negotiated and the caller thread
191 * is bound to no BACKGROUND vres, since no way is provided in order of
192 * specifying the contract label and get back the vres id!
194 * Note also that, since in this implementation the threads/processes with
195 * backgound contracts are left into the default Linux scheduler hands' and
196 * not attached to any AQuoSA server, while we're violating what D-AC2v1
197 * (pag. 14) says, we achieve exactly the same behaviour!!
199 * possible return values:
201 * FRSH_ERR_ALREADY_INITIALIZED
202 * FRSH_ERR_INTERNAL_ERROR (something, different from the previous case, gone wrong)
204 int aqcpu_fra_init(void)
209 if ((qrv = qres_init()) != QOS_OK) {
214 if ((rv = fra_register(&aqcpu_allocator))) {
219 /* install the cleanup function of th AQuoSA framework as an exit
220 * handler function (quite futile but, for now, it's sufficent) */
221 if (atexit(aqcpu_cleanup_wrapper))
222 return(FRSH_ERR_INTERNAL_ERROR);
224 aqcpu_initialized = 1;
234 return qos_rv_int(rv);
237 int fra_CPU_bind_thread
238 (const fres_vres_t *vres,
239 const fosa_thread_id_t thread)
242 qres_sid_t sid = *((qres_sid_t*)vres->priv);
244 if ((qrv = qres_attach_thread(sid, thread.linux_pid,
245 thread.linux_tid)) != QOS_OK)
253 int fra_CPU_unbind_thread(const fosa_thread_id_t thread)
258 if (qres_get_sid(thread.linux_pid, thread.linux_tid, &sid) != QOS_OK)
261 if ((qrv = qres_detach_thread(sid, thread.linux_pid,
262 thread.linux_tid)) != QOS_OK)
270 int fra_CPU_get_usage
271 (const fres_vres_t *vres,
272 fosa_rel_time_t *spent)
274 qres_sid_t sid = *((qres_sid_t*)vres->priv);
275 qres_time_t exec_budget;
279 return FRSH_ERR_BAD_ARGUMENT;
281 rv = qres_get_exec_time(sid, &exec_budget, NULL);
282 if (rv != QOS_OK) return EINVAL;
284 *spent = fosa_usec_to_rel_time(exec_budget);
289 int fra_CPU_get_job_usage
290 (const fres_vres_t *vres,
291 fosa_rel_time_t *spent)
293 qres_sid_t sid = *((qres_sid_t*)vres->priv);
294 qres_params_t q_params;
295 qres_time_t curr_budget;
299 return FRSH_ERR_BAD_ARGUMENT;
301 rv = qres_get_params(sid, &q_params);
302 if (rv != QOS_OK) return EINVAL;
303 rv = qres_get_curr_budget(sid, &curr_budget);
304 if (rv != QOS_OK) return EINVAL;
306 *spent = fosa_usec_to_rel_time(q_params.Q - curr_budget);
311 int fra_CPU_get_remaining_budget
312 (const fres_vres_t *vres,
313 fosa_rel_time_t *budget)
315 qres_sid_t sid = *((qres_sid_t*)vres->priv);
316 qres_time_t curr_budget;
320 return FRSH_ERR_BAD_ARGUMENT;
322 rv = qres_get_curr_budget(sid, &curr_budget);
323 if (rv != QOS_OK) return EINVAL;
325 *budget = fosa_usec_to_rel_time(curr_budget);
330 int fra_CPU_set_spare_bandwidth(fres_vres_t *vres)
332 qres_sid_t fake_sid = (qres_sid_t) -1;
333 aqcpu_params_t cpu_params;
336 /* get aqcpu params from contract */
337 get_aqcpu_params(vres, &cpu_params);
340 /* reserve CPU bandwidth for feedback */
341 rv = qsup_reserve_spare(r2bw(cpu_params.Q, cpu_params.P));
342 if (rv != QOS_OK) return qos_rv_int(rv);
344 printf("Created AQCPU spare (period=%lld us, budget=%lld us)\n",
345 cpu_params.P, cpu_params.Q);
346 if ((vres->priv = malloc(sizeof(qres_sid_t)))) {
347 memcpy(vres->priv, &fake_sid, sizeof(qres_sid_t));
353 int fra_CPU_get_desired_budget
355 frsh_rel_time_t *p_budget_out)
357 qres_sid_t sid = *((qres_sid_t*)vres->priv);
358 qres_params_t q_params;
362 return FRSH_ERR_BAD_ARGUMENT;
364 rv = qres_get_params(sid, &q_params);
365 if (rv != QOS_OK) return EINVAL;
367 *p_budget_out = fosa_usec_to_rel_time(q_params.Q);
372 int fra_CPU_set_desired_budget
374 fosa_rel_time_t *p_budget_in)
376 qres_sid_t sid = *((qres_sid_t*)vres->priv);
377 qres_params_t q_params;
381 return FRSH_ERR_BAD_ARGUMENT;
383 rv = qres_get_params(sid, &q_params);
384 if (rv != QOS_OK) return EINVAL;
386 q_params.Q = fosa_rel_time_to_usec(*p_budget_in);
388 rv = qres_set_params(sid, &q_params);
389 if (rv != QOS_OK) return EINVAL;
394 int fra_CPU_get_actual_budget
396 fosa_rel_time_t *budget)
398 qres_sid_t sid = *((qres_sid_t*)vres->priv);
399 qres_time_t appr_budget;
403 return FRSH_ERR_BAD_ARGUMENT;
405 rv = qres_get_appr_budget(sid, &appr_budget);
406 if (rv != QOS_OK) return EINVAL;
408 *budget = fosa_usec_to_rel_time(appr_budget);