freebsd-skq/sys/dev/hwpmc/hwpmc_x86.c
jkoshy 1fafbd1bb5 On x86 processors, turn off any 'INTERRUPT' capabilities on PMCs
if the CPU does not have its local APIC enabled.

MFC after:	3 days
2005-08-22 18:20:41 +00:00

190 lines
4.5 KiB
C

/*-
* Copyright (c) 2005, Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/pmc.h>
#include <sys/systm.h>
#include <machine/apicreg.h>
#include <machine/pmc_mdep.h>
#include <machine/md_var.h>
extern volatile lapic_t *lapic;
void
pmc_x86_lapic_enable_pmc_interrupt(void)
{
uint32_t value;
value = lapic->lvt_pcint;
value &= ~APIC_LVT_M;
lapic->lvt_pcint = value;
}
static struct pmc_mdep *
pmc_intel_initialize(void)
{
struct pmc_mdep *pmc_mdep;
enum pmc_cputype cputype;
int error, model;
KASSERT(strcmp(cpu_vendor, "GenuineIntel") == 0,
("[intel,%d] Initializing non-intel processor", __LINE__));
PMCDBG(MDP,INI,0, "intel-initialize cpuid=0x%x", cpu_id);
cputype = -1;
switch (cpu_id & 0xF00) {
#if defined(__i386__)
case 0x500: /* Pentium family processors */
cputype = PMC_CPU_INTEL_P5;
break;
case 0x600: /* Pentium Pro, Celeron, Pentium II & III */
switch ((cpu_id & 0xF0) >> 4) { /* model number field */
case 0x1:
cputype = PMC_CPU_INTEL_P6;
break;
case 0x3: case 0x5:
cputype = PMC_CPU_INTEL_PII;
break;
case 0x6:
cputype = PMC_CPU_INTEL_CL;
break;
case 0x7: case 0x8: case 0xA: case 0xB:
cputype = PMC_CPU_INTEL_PIII;
break;
case 0x9: case 0xD:
cputype = PMC_CPU_INTEL_PM;
break;
}
break;
#endif
#if defined(__i386__) || defined(__amd64__)
case 0xF00: /* P4 */
model = ((cpu_id & 0xF0000) >> 12) | ((cpu_id & 0xF0) >> 4);
if (model >= 0 && model <= 4) /* known models */
cputype = PMC_CPU_INTEL_PIV;
break;
}
#endif
if ((int) cputype == -1) {
printf("pmc: Unknown Intel CPU.\n");
return NULL;
}
MALLOC(pmc_mdep, struct pmc_mdep *, sizeof(struct pmc_mdep),
M_PMC, M_WAITOK|M_ZERO);
pmc_mdep->pmd_cputype = cputype;
pmc_mdep->pmd_nclass = 2;
pmc_mdep->pmd_classes[0].pm_class = PMC_CLASS_TSC;
pmc_mdep->pmd_classes[0].pm_caps = PMC_CAP_READ;
pmc_mdep->pmd_classes[0].pm_width = 64;
pmc_mdep->pmd_nclasspmcs[0] = 1;
error = 0;
switch (cputype) {
#if defined(__i386__) || defined(__amd64__)
/*
* Intel Pentium 4 Processors, and P4/EMT64 processors.
*/
case PMC_CPU_INTEL_PIV:
error = pmc_initialize_p4(pmc_mdep);
break;
#endif
#if defined(__i386__)
/*
* P6 Family Processors
*/
case PMC_CPU_INTEL_P6:
case PMC_CPU_INTEL_CL:
case PMC_CPU_INTEL_PII:
case PMC_CPU_INTEL_PIII:
case PMC_CPU_INTEL_PM:
error = pmc_initialize_p6(pmc_mdep);
break;
/*
* Intel Pentium PMCs.
*/
case PMC_CPU_INTEL_P5:
error = pmc_initialize_p5(pmc_mdep);
break;
#endif
default:
KASSERT(0,("[intel,%d] Unknown CPU type", __LINE__));
}
if (error) {
FREE(pmc_mdep, M_PMC);
pmc_mdep = NULL;
}
return pmc_mdep;
}
/*
* Machine dependent initialization for x86 class platforms.
*/
struct pmc_mdep *
pmc_md_initialize()
{
int i;
struct pmc_mdep *md;
/* determine the CPU kind */
md = NULL;
if (strcmp(cpu_vendor, "AuthenticAMD") == 0)
md = pmc_amd_initialize();
else if (strcmp(cpu_vendor, "GenuineIntel") == 0)
md = pmc_intel_initialize();
/* disallow sampling if we do not have an LAPIC */
if (md != NULL && lapic == NULL)
for (i = 1; i < md->pmd_nclass; i++)
md->pmd_classes[i].pm_caps &= ~PMC_CAP_INTERRUPT;
return md;
}