From 1b9278cc989bd23a4e620f1b58d624819ca8e1c0 Mon Sep 17 00:00:00 2001
From: glebius <glebius@FreeBSD.org>
Date: Tue, 4 Mar 2014 14:49:05 +0000
Subject: Merge r261796 from head:   While it isn't too late and
 kvm_read_zpcpu() function isn't yet used   outside libkvm(3), change its
 order of arguments, so that it is the   same as in kvm_read(). Merge r261805
 from head:   Add kvm_getncpus() to obtain mp_ncpus.

---
 lib/libkvm/kvm.h         |  3 ++-
 lib/libkvm/kvm_getpcpu.3 | 10 ++++++++--
 lib/libkvm/kvm_pcpu.c    | 14 ++++++++++++--
 3 files changed, 22 insertions(+), 5 deletions(-)

(limited to 'lib/libkvm')

diff --git a/lib/libkvm/kvm.h b/lib/libkvm/kvm.h
index d2ee8fa..d697795 100644
--- a/lib/libkvm/kvm.h
+++ b/lib/libkvm/kvm.h
@@ -77,6 +77,7 @@ char	 *kvm_geterr(kvm_t *);
 char	 *kvm_getfiles(kvm_t *, int, int, int *);
 int	  kvm_getloadavg(kvm_t *, double [], int);
 int	  kvm_getmaxcpu(kvm_t *);
+int	  kvm_getncpus(kvm_t *);
 void	 *kvm_getpcpu(kvm_t *, int);
 uint64_t  kvm_counter_u64_fetch(kvm_t *, u_long);
 struct kinfo_proc *
@@ -88,7 +89,7 @@ kvm_t	 *kvm_open
 kvm_t	 *kvm_openfiles
 	    (const char *, const char *, const char *, int, char *);
 ssize_t	  kvm_read(kvm_t *, unsigned long, void *, size_t);
-ssize_t	  kvm_read_zpcpu(kvm_t *, void *, u_long, size_t, int);
+ssize_t	  kvm_read_zpcpu(kvm_t *, unsigned long, void *, size_t, int);
 ssize_t	  kvm_write(kvm_t *, unsigned long, const void *, size_t);
 __END_DECLS
 
diff --git a/lib/libkvm/kvm_getpcpu.3 b/lib/libkvm/kvm_getpcpu.3
index 4087f1c..13192c2 100644
--- a/lib/libkvm/kvm_getpcpu.3
+++ b/lib/libkvm/kvm_getpcpu.3
@@ -28,7 +28,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd April 11, 2013
+.Dd February 12, 2014
 .Dt KVM_GETPCPU 3
 .Os
 .Sh NAME
@@ -47,10 +47,12 @@
 .Fn kvm_dpcpu_setcpu "kvm_t *kd" "u_int cpu"
 .Ft int
 .Fn kvm_getmaxcpu "kvm_t *kd"
+.Ft int
+.Fn kvm_getncpus "kvm_t *kd"
 .Ft void *
 .Fn kvm_getpcpu "kvm_t *kd" "int cpu"
 .Ft ssize_t
-.Fn kvm_read_zpcpu "kvm_t *kd" "void *buf" "u_long base" "size_t size" "int cpu"
+.Fn kvm_read_zpcpu "kvm_t *kd" "u_long base" "void *buf" "size_t size" "int cpu"
 .Ft uint64_t
 .Fn kvm_counter_u64_fetch "kvm_t *kd" "u_long base"
 .Sh DESCRIPTION
@@ -73,6 +75,10 @@ The
 function returns the maximum number of CPUs supported by the kernel.
 .Pp
 The
+.Fn kvm_getncpus
+function returns the current number of CPUs in the kernel.
+.Pp
+The
 .Fn kvm_getpcpu
 function returns a buffer holding the per-CPU data for a single CPU.
 This buffer is described by the
diff --git a/lib/libkvm/kvm_pcpu.c b/lib/libkvm/kvm_pcpu.c
index 2d7fb41..662566a 100644
--- a/lib/libkvm/kvm_pcpu.c
+++ b/lib/libkvm/kvm_pcpu.c
@@ -173,6 +173,16 @@ kvm_getmaxcpu(kvm_t *kd)
 	return (maxcpu);
 }
 
+int
+kvm_getncpus(kvm_t *kd)
+{
+
+	if (mp_ncpus == 0)
+		if (_kvm_pcpu_init(kd) < 0)
+			return (-1);
+	return (mp_ncpus);
+}
+
 static int
 _kvm_dpcpu_setcpu(kvm_t *kd, u_int cpu, int report_error)
 {
@@ -306,7 +316,7 @@ kvm_dpcpu_setcpu(kvm_t *kd, u_int cpu)
  * Obtain a per-CPU copy for given cpu from UMA_ZONE_PCPU allocation.
  */
 ssize_t
-kvm_read_zpcpu(kvm_t *kd, void *buf, u_long base, size_t size, int cpu)
+kvm_read_zpcpu(kvm_t *kd, u_long base, void *buf, size_t size, int cpu)
 {
 
 	return (kvm_read(kd, (uintptr_t)(base + sizeof(struct pcpu) * cpu),
@@ -327,7 +337,7 @@ kvm_counter_u64_fetch(kvm_t *kd, u_long base)
 
 	r = 0;
 	for (int i = 0; i < mp_ncpus; i++) {
-		if (kvm_read_zpcpu(kd, &c, base, sizeof(c), i) != sizeof(c))
+		if (kvm_read_zpcpu(kd, base, &c, sizeof(c), i) != sizeof(c))
 			return (0);
 		r += c;
 	}
-- 
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