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If we are unable to obtain a frequency list from either ACPI or the static

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tables, then attempt to build a simple list containing just the high and
low frequencies based on the current CPU frequency calculated during boot
and the contents of the MSR.

MFC after:	1 month
This commit is contained in:
jhb 2008-08-23 12:53:42 +00:00
parent d4ceeb8daa
commit ca3f42bc92
1 changed files with 88 additions and 1 deletions
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89
sys/i386/cpufreq/est.c
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@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <sys/systm.h>
#include "cpufreq_if.h"
#include <machine/clock.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
@ -71,6 +72,7 @@ typedef struct {
struct est_softc {
device_t dev;
int acpi_settings;
int msr_settings;
freq_info *freq_list;
};
@ -898,6 +900,7 @@ static int est_detach(device_t parent);
static int est_get_info(device_t dev);
static int est_acpi_info(device_t dev, freq_info **freqs);
static int est_table_info(device_t dev, uint64_t msr, freq_info **freqs);
static int est_msr_info(device_t dev, uint64_t msr, freq_info **freqs);
static freq_info *est_get_current(freq_info *freq_list);
static int est_settings(device_t dev, struct cf_setting *sets, int *count);
static int est_set(device_t dev, const struct cf_setting *set);
@ -1035,7 +1038,7 @@ est_detach(device_t dev)
struct est_softc *sc;
sc = device_get_softc(dev);
if (sc->acpi_settings)
if (sc->acpi_settings || sc->msr_settings)
free(sc->freq_list, M_DEVBUF);
#endif
return (ENXIO);
@ -1060,6 +1063,8 @@ est_get_info(device_t dev)
error = est_table_info(dev, msr, &sc->freq_list);
if (error)
error = est_acpi_info(dev, &sc->freq_list);
if (error)
error = est_msr_info(dev, msr, &sc->freq_list);
if (error) {
printf(
@ -1165,6 +1170,88 @@ est_table_info(device_t dev, uint64_t msr, freq_info **freqs)
return (0);
}
static int
bus_speed_ok(int bus)
{
switch (bus) {
case 100:
case 133:
case 333:
return (1);
default:
return (0);
}
}
/*
* Flesh out a simple rate table containing the high and low frequencies
* based on the current clock speed and the upper 32 bits of the MSR.
*/
static int
est_msr_info(device_t dev, uint64_t msr, freq_info **freqs)
{
struct est_softc *sc;
freq_info *fp;
int bus, freq, volts;
uint16_t id;
/* Figure out the bus clock. */
freq = tsc_freq / 1000000;
id = msr >> 32;
bus = freq / (id >> 8);
device_printf(dev, "Guessed bus clock (high) of %d MHz\n", bus);
if (!bus_speed_ok(bus)) {
/* We may be running on the low frequency. */
id = msr >> 48;
bus = freq / (id >> 8);
device_printf(dev, "Guessed bus clock (low) of %d MHz\n", bus);
if (!bus_speed_ok(bus))
return (EOPNOTSUPP);
/* Calculate high frequency. */
id = msr >> 32;
freq = ((id >> 8) & 0xff) * bus;
}
/* Fill out a new freq table containing just the high and low freqs. */
sc = device_get_softc(dev);
fp = malloc(sizeof(freq_info) * 3, M_DEVBUF, M_WAITOK | M_ZERO);
/* First, the high frequency. */
volts = id & 0xff;
if (volts != 0) {
volts <<= 4;
volts += 700;
}
fp[0].freq = freq;
fp[0].volts = volts;
fp[0].id16 = id;
fp[0].power = CPUFREQ_VAL_UNKNOWN;
device_printf(dev, "Guessed high setting of %d MHz @ %d Mv\n", freq,
volts);
/* Second, the low frequency. */
id = msr >> 48;
freq = ((id >> 8) & 0xff) * bus;
volts = id & 0xff;
if (volts != 0) {
volts <<= 4;
volts += 700;
}
fp[1].freq = freq;
fp[1].volts = volts;
fp[1].id16 = id;
fp[1].power = CPUFREQ_VAL_UNKNOWN;
device_printf(dev, "Guessed low setting of %d MHz @ %d Mv\n", freq,
volts);
/* Table is already terminated due to M_ZERO. */
sc->msr_settings = TRUE;
*freqs = fp;
return (0);
}
static void
est_get_id16(uint16_t *id16_p)
{