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/* $OpenBSD: pctrctl.c,v 1.2 1996/08/14 03:02:52 dm Exp $ */
/*
* Pentium performance counter driver for OpenBSD.
* Author: David Mazieres <dm@lcs.mit.edu>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <machine/cpu.h>
#include <machine/pctr.h>
char *progname;
char *pctr_name[] = {
"Data read", /* 0 */
"Data write",
"Data TLB miss",
"Data read miss",
"Data write miss",
"Write (hit) to M or E state lines",
"Data cache lines written back",
"Data cache snoops",
"Data cache snoop hits", /* 8 */
"Memory accesses in both pipes",
"Bank conflicts",
"Misaligned data memory references",
"Code read",
"Code TLB miss",
"Code cache miss",
"Any segment register load",
NULL, /* 0x10 */
NULL,
"Branches",
"BTB hits",
"Taken branch or BTB hit",
"Pipeline flushes",
"Instructions executed",
"Instructions executed in the V-pipe",
"Bus utilization (clocks)", /* 0x18 */
"Pipeline stalled by write backup",
"Pipeline stalled by data memory read",
"Pipeline stalled by write to E or M line",
"Locked bus cycle",
"I/O read or write cycle",
"Noncacheable memory references",
"AGI (Address Generation Interlock)",
NULL, /* 0x20 */
NULL,
"Floating-point operations",
"Breakpoint 0 match",
"Breakpoint 1 match",
"Breakpoint 2 match",
"Breakpoint 3 match",
"Hardware interupts",
"Data read or data write", /* 0x28 */
"Data read miss or data write miss",
};
static const int pctr_name_size = (sizeof (pctr_name) / sizeof (char *));
/* Print all possible counter functions */
static void
list (void)
{
int i;
printf ("Hardware counter event types:\n");
for (i = 0; i < pctr_name_size; i++)
printf (" %02x %s\n", i, pctr_name[i] ? pctr_name[i] : "invalid");
}
/* Print status of counters */
static void
readst (void)
{
int fd, i;
struct pctrst st;
fd = open (_PATH_PCTR, O_RDONLY);
if (fd < 0) {
perror (_PATH_PCTR);
exit (1);
}
if (ioctl (fd, PCIOCRD, &st) < 0) {
perror ("PCIOCRD");
exit (1);
}
close (fd);
for (i = 0; i < PCTR_NUM; i++)
printf (" ctr%d = %16qd [%c%c%c %02x (%s)]\n", i, st.pctr_hwc[i],
(st.pctr_fn[i] & P5CTR_C) ? 'c' : 'e',
(st.pctr_fn[i] & P5CTR_U) ? 'u' : '-',
(st.pctr_fn[i] & P5CTR_K) ? 'k' : '-',
(st.pctr_fn[i] & 0x3f),
(((st.pctr_fn[i] & 0x3f) < pctr_name_size
&& pctr_name[st.pctr_fn[i] & 0x3f])
? pctr_name[st.pctr_fn[i] & 0x3f] : "invalid"));
printf (" tsc = %16qd\n idl = %16qd\n", st.pctr_tsc, st.pctr_idl);
}
static void
setctr (int ctr, u_int val)
{
int fd;
fd = open (_PATH_PCTR, O_WRONLY);
if (fd < 0) {
perror (_PATH_PCTR);
exit (1);
}
if (ioctl (fd, PCIOCS0 + ctr, &val) < 0) {
perror ("PCIOCSn");
exit (1);
}
close (fd);
}
static void
usage (void)
{
fprintf (stderr,
"usage: %s [-l | -s ctr [selstr] evtype]\n"
" -l list event types\n"
" -s set counter <ctr> to monitor events of type <evtype>\n"
" <selstr> = [e|c][u][k] (default euk)\n"
" e - count number of events\n"
" c - count number of cycles\n"
" u - count events in user mode (ring 3)\n"
" k - count events in kernel mode (rings 0-2)\n",
progname);
exit (1);
}
int
main (int argc, char **argv)
{
int fd;
u_int ctr;
char *cp;
u_short fn;
pctrval id = __cpuid ();
if (__hasp6ctr (id)) {
fprintf (stderr, "Pentium Pro not supported\n");
exit (1);
}
if (progname = strrchr (argv[0], '/'))
progname++;
else
progname = argv[0];
if (argc <= 1)
readst ();
else if (argc == 2 && !strcmp (argv[1], "-l"))
list ();
else if (!strcmp (argv[1], "-s") && argc >= 4) {
if (argc > 5)
usage ();
ctr = atoi (argv[2]);
if (ctr >= PCTR_NUM)
usage ();
if (argc == 5) {
fn = strtoul (argv[4], NULL, 16);
if (fn & ~0x3f)
usage ();
for (cp = argv[3]; *cp; cp++) {
switch (*cp) {
case 'c':
fn |= P5CTR_C;
break;
case 'e':
fn &= ~P5CTR_C;
break;
case 'k':
fn |= P5CTR_K;
break;
case 'u':
fn |= P5CTR_U;
break;
default:
usage ();
}
}
}
else {
fn = strtoul (argv[3], NULL, 16);
if (fn & ~0x3f)
usage ();
fn |= P5CTR_K | P5CTR_U;
}
setctr (ctr, fn);
}
else
usage ();
return 0;
}
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