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Add a kern.timecounter.tc sysctl tree that contains the mask,

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frequency, quality and current value of each available time counter.

At the moment all of these are read-only, but it might make sense to
make some of these read-write in the future.

MFC after:	3 months
This commit is contained in:
dwmalone 2006-06-16 20:29:05 +00:00
parent d37c93f028
commit 2e1fa1a727
1 changed files with 40 additions and 0 deletions
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40
sys/kern/kern_tc.c
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@ -97,6 +97,7 @@ SYSCTL_PROC(_kern, KERN_BOOTTIME, boottime, CTLTYPE_STRUCT|CTLFLAG_RD,
NULL, 0, sysctl_kern_boottime, "S,timeval", "System boottime");
SYSCTL_NODE(_kern, OID_AUTO, timecounter, CTLFLAG_RW, 0, "");
SYSCTL_NODE(_kern_timecounter, OID_AUTO, tc, CTLFLAG_RW, 0, "");
static int timestepwarnings;
SYSCTL_INT(_kern_timecounter, OID_AUTO, stepwarnings, CTLFLAG_RW,
@ -133,6 +134,26 @@ sysctl_kern_boottime(SYSCTL_HANDLER_ARGS)
return SYSCTL_OUT(req, &boottime, sizeof(boottime));
}
static int
sysctl_kern_timecounter_get(SYSCTL_HANDLER_ARGS)
{
u_int ncount;
struct timecounter *tc = arg1;
ncount = tc->tc_get_timecount(tc);
return sysctl_handle_int(oidp, &ncount, sizeof(ncount), req);
}
static int
sysctl_kern_timecounter_freq(SYSCTL_HANDLER_ARGS)
{
u_int64_t freq;
struct timecounter *tc = arg1;
freq = tc->tc_frequency;
return sysctl_handle_int(oidp, &freq, sizeof(freq), req);
}
/*
* Return the difference between the timehands' counter value now and what
* was when we copied it to the timehands' offset_count.
@ -309,6 +330,7 @@ void
tc_init(struct timecounter *tc)
{
u_int u;
struct sysctl_oid *tc_root;
u = tc->tc_frequency / tc->tc_counter_mask;
/* XXX: We need some margin here, 10% is a guess */
@ -329,6 +351,24 @@ tc_init(struct timecounter *tc)
tc->tc_next = timecounters;
timecounters = tc;
/*
* Set up sysctl tree for this counter.
*/
tc_root = SYSCTL_ADD_NODE(NULL,
SYSCTL_STATIC_CHILDREN(_kern_timecounter_tc), OID_AUTO, tc->tc_name,
CTLFLAG_RW, 0, "timecounter description");
SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
"mask", CTLFLAG_RD, &(tc->tc_counter_mask), 0,
"mask for implemented bits");
SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
"counter", CTLTYPE_UINT | CTLFLAG_RD, tc, sizeof(*tc),
sysctl_kern_timecounter_get, "IU", "current timecounter value");
SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
"frequency", CTLTYPE_QUAD | CTLFLAG_RD, tc, sizeof(*tc),
sysctl_kern_timecounter_freq, "IU", "timecounter frequency");
SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
"quality", CTLFLAG_RD, &(tc->tc_quality), 0,
"goodness of time counter");
/*
* Never automatically use a timecounter with negative quality.
* Even though we run on the dummy counter, switching here may be