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kern_cpu.c (232793) kern_cpu.c (264984)
1/*-
2 * Copyright (c) 2004-2007 Nate Lawson (SDG)
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
1/*-
2 * Copyright (c) 2004-2007 Nate Lawson (SDG)
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/kern/kern_cpu.c 232793 2012-03-10 18:56:16Z mav $");
28__FBSDID("$FreeBSD: head/sys/kern/kern_cpu.c 264984 2014-04-26 20:27:54Z scottl $");
29
30#include <sys/param.h>
31#include <sys/bus.h>
32#include <sys/cpu.h>
33#include <sys/eventhandler.h>
34#include <sys/kernel.h>
35#include <sys/lock.h>
36#include <sys/malloc.h>

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263#ifdef SMP
264 /*
265 * If still booting and secondary CPUs not started yet, don't allow
266 * changing the frequency until they're online. This is because we
267 * can't switch to them using sched_bind() and thus we'd only be
268 * switching the main CPU. XXXTODO: Need to think more about how to
269 * handle having different CPUs at different frequencies.
270 */
29
30#include <sys/param.h>
31#include <sys/bus.h>
32#include <sys/cpu.h>
33#include <sys/eventhandler.h>
34#include <sys/kernel.h>
35#include <sys/lock.h>
36#include <sys/malloc.h>

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263#ifdef SMP
264 /*
265 * If still booting and secondary CPUs not started yet, don't allow
266 * changing the frequency until they're online. This is because we
267 * can't switch to them using sched_bind() and thus we'd only be
268 * switching the main CPU. XXXTODO: Need to think more about how to
269 * handle having different CPUs at different frequencies.
270 */
271 if (mp_ncpus > 1 && !smp_active) {
271 if (mp_ncpus > 1 && !smp_started) {
272 device_printf(dev, "rejecting change, SMP not started yet\n");
273 error = ENXIO;
274 goto out;
275 }
276#endif /* SMP */
277
278 /*
279 * If the requested level has a lower priority, don't allow

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272 device_printf(dev, "rejecting change, SMP not started yet\n");
273 error = ENXIO;
274 goto out;
275 }
276#endif /* SMP */
277
278 /*
279 * If the requested level has a lower priority, don't allow

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