diff options
| author | njl <njl@FreeBSD.org> | 2007-03-26 18:03:29 +0000 |
|---|---|---|
| committer | njl <njl@FreeBSD.org> | 2007-03-26 18:03:29 +0000 |
| commit | 4933ca0aa02fff68e3e30186b454ed25d7d926fb (patch) | |
| tree | 38a5baa5f3b7261150b7178ed80307e7f2bd65c9 /sys/contrib | |
| parent | 3cb53690e0c2c81ed3b336133bf003c7b3173abf (diff) | |
| download | FreeBSD-src-4933ca0aa02fff68e3e30186b454ed25d7d926fb.zip FreeBSD-src-4933ca0aa02fff68e3e30186b454ed25d7d926fb.tar.gz | |
Add an interface for drivers to be notified of changes to CPU frequency.
cpufreq_pre_change is called before the change, giving each driver a chance
to revoke the change. cpufreq_post_change provides the results of the
change (success or failure). cpufreq_levels_changed gives the unit number
of the cpufreq device whose number of available levels has changed. Hook
in all the drivers I could find that needed it.
* TSC: update TSC frequency value. When the available levels change, take the
highest possible level and notify the timecounter set_cputicker() of that
freq. This gets rid of the "calcru: runtime went backwards" messages.
* identcpu: updates the sysctl hw.clockrate value
* Profiling: if profiling is active when the clock changes, let the user
know the results may be inaccurate.
Reviewed by: bde, phk
MFC after: 1 month
Diffstat (limited to 'sys/contrib')
| -rw-r--r-- | sys/contrib/altq/altq/altq_subr.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sys/contrib/altq/altq/altq_subr.c b/sys/contrib/altq/altq/altq_subr.c index 0b4d22d..fb6b91c 100644 --- a/sys/contrib/altq/altq/altq_subr.c +++ b/sys/contrib/altq/altq/altq_subr.c @@ -74,6 +74,9 @@ #if __FreeBSD__ < 3 #include "opt_cpu.h" /* for FreeBSD-2.2.8 to get i586_ctr_freq */ #endif +#include <sys/bus.h> +#include <sys/cpu.h> +#include <sys/eventhandler.h> #include <machine/clock.h> #endif #if defined(__i386__) @@ -898,6 +901,22 @@ extern u_int64_t cycles_per_usec; /* alpha cpu clock frequency */ extern u_int64_t cpu_tsc_freq; #endif /* __alpha__ */ +#if (__FreeBSD_version >= 700035) +/* Update TSC freq with the value indicated by the caller. */ +static void +tsc_freq_changed(void *arg, const struct cf_level *level, int status) +{ + /* If there was an error during the transition, don't do anything. */ + if (status != 0) + return; + + /* Total setting for this level gives the new frequency in MHz. */ + machclk_freq = level->total_set.freq * 1000000; +} +EVENTHANDLER_DEFINE(cpufreq_post_change, tsc_freq_changed, NULL, + EVENTHANDLER_PRI_ANY); +#endif /* __FreeBSD_version >= 700035 */ + void init_machclk(void) { |
