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Add support for _PDC/_OSC by advertising that we support direct access to

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the PERF_CTL/STS MSRs via the new acpi_get_features() method.  This should
allow newer systems to use SpeedStep.
This commit is contained in:
Nate Lawson 2005-04-04 15:51:13 +00:00
parent b29224c2a0
commit 15785fbe81
2 changed files with 26 additions and 7 deletions
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22
sys/i386/cpufreq/est.c
View File

@ -40,6 +40,10 @@ __FBSDID("$FreeBSD$");
#include "cpufreq_if.h"
#include <machine/md_var.h>
#include <contrib/dev/acpica/acpi.h>
#include <dev/acpica/acpivar.h>
#include "acpi_if.h"
/* Status/control registers (from the IA-32 System Programming Guide). */
#define MSR_PERF_STATUS 0x198
#define MSR_PERF_CTL 0x199
@ -532,6 +536,7 @@ static cpu_info ESTprocs[] = {
};
static void est_identify(driver_t *driver, device_t parent);
static int est_features(driver_t *driver, u_int *features);
static int est_probe(device_t parent);
static int est_attach(device_t parent);
static int est_detach(device_t parent);
@ -557,6 +562,10 @@ static device_method_t est_methods[] = {
DEVMETHOD(cpufreq_drv_get, est_get),
DEVMETHOD(cpufreq_drv_type, est_type),
DEVMETHOD(cpufreq_drv_settings, est_settings),
/* ACPI interface */
DEVMETHOD(acpi_get_features, est_features),
{0, 0}
};
@ -569,9 +578,19 @@ static driver_t est_driver = {
static devclass_t est_devclass;
DRIVER_MODULE(est, cpu, est_driver, est_devclass, 0, 0);
static int
est_features(driver_t *driver, u_int *features)
{
/* Notify the ACPI CPU that we support direct access to MSRs */
*features = ACPI_CAP_PERF_MSRS;
return (0);
}
static void
est_identify(driver_t *driver, device_t parent)
{
device_t child;
u_int p[4];
/* Make sure we're not being doubly invoked. */
@ -591,7 +610,8 @@ est_identify(driver_t *driver, device_t parent)
* We add a child for each CPU since settings must be performed
* on each CPU in the SMP case.
*/
if (BUS_ADD_CHILD(parent, 0, "est", -1) == NULL)
child = BUS_ADD_CHILD(parent, 0, "est", -1);
if (child == NULL)
device_printf(parent, "add est child failed\n");
}

11
sys/modules/cpufreq/Makefile
View File

@ -8,13 +8,12 @@ WARNS?= 2
SRCS= ichss.c
SRCS+= bus_if.h cpufreq_if.h device_if.h pci_if.h
.if ${MACHINE} == "i386"
.if ${MACHINE} == "i386" || ${MACHINE} == "amd64"
.PATH: ${.CURDIR}/../../i386/cpufreq
CFLAGS+= -I${.CURDIR}/../../contrib/dev/acpica
SRCS+= acpi_if.h opt_acpi.h
SRCS+= est.c p4tcc.c powernow.c
.endif
.if ${MACHINE} == "amd64"
.PATH: ${.CURDIR}/../../i386/cpufreq
SRCS+= powernow.c
.endif
.include <bsd.kmod.mk>