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/* $OpenBSD: pctr.c,v 1.21 2006/09/19 11:06:33 jsg Exp $ */
/*
* Pentium performance counter driver for OpenBSD.
* Copyright 1996 David Mazieres <dm@lcs.mit.edu>.
*
* Modification and redistribution in source and binary forms is
* permitted provided that due credit is given to the author and the
* OpenBSD project by leaving this copyright notice intact.
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/ioccom.h>
#include <sys/systm.h>
#include <machine/cputypes.h>
#include <machine/psl.h>
#include <machine/pctr.h>
#include <machine/cpu.h>
#include <machine/specialreg.h>
pctrval pctr_idlcnt; /* Gets incremented in locore.s */
/* Pull in the cpuid values from locore.s */
extern int cpu_id;
extern int cpu_feature;
extern char cpu_vendor[];
int pctr_isintel;
#define usetsc (cpu_feature & CPUID_TSC)
#define usep5ctr (pctr_isintel && (((cpu_id >> 8) & 15) == 5) && \
(((cpu_id >> 4) & 15) > 0))
#define usep6ctr (pctr_isintel && ((cpu_id >> 8) & 15) == 6)
void pctrattach(int);
int pctropen(dev_t, int, int, struct proc *);
int pctrclose(dev_t, int, int, struct proc *);
int pctrioctl(dev_t, u_long, caddr_t, int, struct proc *);
int p5ctrsel(int fflag, u_int cmd, u_int fn);
static __inline void p5ctrrd(struct pctrst *st);
int p6ctrsel(int fflag, u_int cmd, u_int fn);
static __inline void p6ctrrd(struct pctrst *st);
void
pctrattach(int num)
{
if (num > 1)
return;
pctr_isintel = (strcmp(cpu_vendor, "GenuineIntel") == 0);
if (usep6ctr)
/* Enable RDTSC and RDPMC instructions from user-level. */
__asm __volatile ("movl %%cr4,%%eax\n"
"\tandl %0,%%eax\n"
"\torl %1,%%eax\n"
"\tmovl %%eax,%%cr4"
:: "i" (~CR4_TSD), "i" (CR4_PCE) : "eax");
else if (usetsc)
/* Enable RDTSC instruction from user-level. */
__asm __volatile ("movl %%cr4,%%eax\n"
"\tandl %0,%%eax\n"
"\tmovl %%eax,%%cr4"
:: "i" (~CR4_TSD) : "eax");
if (usep6ctr)
printf("pctr: 686-class user-level performance counters enabled\n");
else if (usep5ctr)
printf("pctr: 586-class performance counters and user-level cycle counter enabled\n");
else if (usetsc)
printf("pctr: user-level cycle counter enabled\n");
else
printf("pctr: no performance counters in CPU\n");
}
int
pctropen(dev_t dev, int oflags, int devtype, struct proc *p)
{
if (minor(dev))
return ENXIO;
return 0;
}
int
pctrclose(dev_t dev, int oflags, int devtype, struct proc *p)
{
return 0;
}
int
p5ctrsel(int fflag, u_int cmd, u_int fn)
{
pctrval msr11;
int msr;
int shift;
cmd -= PCIOCS0;
if (cmd > 1)
return EINVAL;
msr = P5MSR_CTR0 + cmd;
shift = cmd ? 0x10 : 0;
if (!(fflag & FWRITE))
return EPERM;
if (fn >= 0x200)
return EINVAL;
msr11 = rdmsr(P5MSR_CTRSEL);
msr11 &= ~(0x1ffLL << shift);
msr11 |= fn << shift;
wrmsr(P5MSR_CTRSEL, msr11);
wrmsr(msr, 0);
return 0;
}
static __inline void
p5ctrrd(struct pctrst *st)
{
u_int msr11;
msr11 = rdmsr(P5MSR_CTRSEL);
st->pctr_fn[0] = msr11 & 0xffff;
st->pctr_fn[1] = msr11 >> 16;
__asm __volatile("cli");
st->pctr_tsc = rdtsc();
st->pctr_hwc[0] = rdmsr(P5MSR_CTR0);
st->pctr_hwc[1] = rdmsr(P5MSR_CTR1);
__asm __volatile("sti");
}
int
p6ctrsel(int fflag, u_int cmd, u_int fn)
{
int msrsel, msrval;
cmd -= PCIOCS0;
if (cmd > 1)
return EINVAL;
msrsel = P6MSR_CTRSEL0 + cmd;
msrval = P6MSR_CTR0 + cmd;
if (!(fflag & FWRITE))
return EPERM;
if (fn & 0x380000)
return EINVAL;
wrmsr(msrval, 0);
wrmsr(msrsel, fn);
wrmsr(msrval, 0);
return 0;
}
static __inline void
p6ctrrd(struct pctrst *st)
{
st->pctr_fn[0] = rdmsr(P6MSR_CTRSEL0);
st->pctr_fn[1] = rdmsr(P6MSR_CTRSEL1);
__asm __volatile("cli");
st->pctr_tsc = rdtsc();
st->pctr_hwc[0] = rdpmc(0);
st->pctr_hwc[1] = rdpmc(1);
__asm __volatile("sti");
}
int
pctrioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct proc *p)
{
switch (cmd) {
case PCIOCRD:
{
struct pctrst *st = (void *)data;
if (usep6ctr)
p6ctrrd(st);
else if (usep5ctr)
p5ctrrd(st);
else {
bzero(st, sizeof(*st));
if (usetsc)
st->pctr_tsc = rdtsc();
}
st->pctr_idl = pctr_idlcnt;
return 0;
}
case PCIOCS0:
case PCIOCS1:
if (usep6ctr)
return p6ctrsel(fflag, cmd, *(u_int *) data);
if (usep5ctr)
return p5ctrsel(fflag, cmd, *(u_int *) data);
return ENODEV;
default:
return EINVAL;
}
}
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