Add sysctl_usec_to_sbintime and sysctl_msec_to_sbintime.

These functions are used to present a sbintime_t as either a number of
microseconds or a number of milliseconds respectively.

Sponsored by: Netflix

2 files changed, 86 insertions, 0 deletions

diff --git a/sys/kern/kern_sysctl.c b/sys/kern/kern_sysctl.c
index 13d05189d52d..879e4d652a5e 100644
--- a/sys/kern/kern_sysctl.c
+++ b/sys/kern/kern_sysctl.c
@@ -1692,6 +1692,53 @@ retry:
 }
 
 /*
+ * Based on on sysctl_handle_int() convert microseconds to a sbintime.
+ */
+int
+sysctl_usec_to_sbintime(SYSCTL_HANDLER_ARGS)
+{
+	int error;
+	int64_t tt;
+	sbintime_t sb;
+
+	tt = *(int64_t *)arg1;
+	sb = ustosbt(tt);
+
+	error = sysctl_handle_64(oidp, &sb, 0, req);
+	if (error || !req->newptr)
+		return (error);
+
+	tt = sbttous(sb);
+	*(int64_t *)arg1 = tt;
+
+	return (0);
+}
+
+/*
+ * Based on on sysctl_handle_int() convert milliseconds to a sbintime.
+ */
+int
+sysctl_msec_to_sbintime(SYSCTL_HANDLER_ARGS)
+{
+	int error;
+	int64_t tt;
+	sbintime_t sb;
+
+	tt = *(int64_t *)arg1;
+	sb = mstosbt(tt);
+
+	error = sysctl_handle_64(oidp, &sb, 0, req);
+	if (error || !req->newptr)
+		return (error);
+
+	tt = sbttoms(sb);
+	*(int64_t *)arg1 = tt;
+
+	return (0);
+}
+
+
+/*
  * Transfer functions to/from kernel space.
  * XXX: rather untested at this point
  */
diff --git a/sys/sys/sysctl.h b/sys/sys/sysctl.h
index 8264f681bcc0..843b6e623cc6 100644
--- a/sys/sys/sysctl.h
+++ b/sys/sys/sysctl.h
@@ -216,6 +216,9 @@ int sysctl_handle_counter_u64_array(SYSCTL_HANDLER_ARGS);
 int sysctl_handle_uma_zone_max(SYSCTL_HANDLER_ARGS);
 int sysctl_handle_uma_zone_cur(SYSCTL_HANDLER_ARGS);
 
+int sysctl_msec_to_sbintime(SYSCTL_HANDLER_ARGS);
+int sysctl_usec_to_sbintime(SYSCTL_HANDLER_ARGS);
+
 int sysctl_dpcpu_int(SYSCTL_HANDLER_ARGS);
 int sysctl_dpcpu_long(SYSCTL_HANDLER_ARGS);
 int sysctl_dpcpu_quad(SYSCTL_HANDLER_ARGS);
@@ -799,6 +802,42 @@ TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
 	    NULL);							\
 })
 
+/* OID expressing a sbintime_t as microseconds */
+#define	SYSCTL_SBINTIME_USEC(parent, nbr, name, access, ptr, descr)	\
+	SYSCTL_OID(parent, nbr, name,					\
+	    CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access),	\
+	    (ptr), 0, sysctl_usec_to_sbintime, "Q", descr);		\
+	CTASSERT(((access) & CTLTYPE) == 0 ||				\
+	    ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S64)
+#define	SYSCTL_ADD_SBINTIME_USEC(ctx, parent, nbr, name, access, ptr, descr) \
+({									\
+	sbintime_t *__ptr = (ptr);					\
+	CTASSERT(((access) & CTLTYPE) == 0 ||				\
+	    ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S64);		\
+	sysctl_add_oid(ctx, parent, nbr, name,				\
+	    CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access),	\
+	    __ptr, 0, sysctl_usec_to_sbintime, "Q", __DESCR(descr),	\
+	    NULL);							\
+})
+
+/* OID expressing a sbintime_t as milliseconds */
+#define	SYSCTL_SBINTIME_MSEC(parent, nbr, name, access, ptr, descr)	\
+	SYSCTL_OID(parent, nbr, name,					\
+	    CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access),	\
+	    (ptr), 0, sysctl_msec_to_sbintime, "Q", descr);		\
+	CTASSERT(((access) & CTLTYPE) == 0 ||				\
+	    ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S64)
+#define	SYSCTL_ADD_SBINTIME_MSEC(ctx, parent, nbr, name, access, ptr, descr) \
+({									\
+	sbintime_t *__ptr = (ptr);					\
+	CTASSERT(((access) & CTLTYPE) == 0 ||				\
+	    ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S64);		\
+	sysctl_add_oid(ctx, parent, nbr, name,				\
+	    CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access),	\
+	    __ptr, 0, sysctl_msec_to_sbintime, "Q", __DESCR(descr),	\
+	    NULL);							\
+})
+
 /*
  * A macro to generate a read-only sysctl to indicate the presence of optional
  * kernel features.