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Fix support for _PDC by using the proper version/length format for the

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buffer.  Also, reference the Intel document where the _PDC values were
found.  This now supports ACPI-assisted SpeedStep on my borrowed T42.
This commit is contained in:
Nate Lawson 2005-04-10 19:07:08 +00:00
parent 4b61852d3d
commit bce9288570
2 changed files with 24 additions and 3 deletions
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25
sys/dev/acpica/acpi_cpu.c
View File

@ -247,7 +247,8 @@ static int
acpi_cpu_attach(device_t dev)
{
ACPI_BUFFER buf;
ACPI_OBJECT *obj;
ACPI_OBJECT arg, *obj;
ACPI_OBJECT_LIST arglist;
struct pcpu *pcpu_data;
struct acpi_cpu_softc *sc;
struct acpi_softc *acpi_sc;
@ -255,6 +256,7 @@ acpi_cpu_attach(device_t dev)
u_int features;
int cpu_id, drv_count, i;
driver_t **drivers;
uint32_t cap_set[3];
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
@ -295,6 +297,7 @@ acpi_cpu_attach(device_t dev)
* Before calling any CPU methods, collect child driver feature hints
* and notify ACPI of them.
*/
sc->cpu_features = 0;
if (devclass_get_drivers(acpi_cpu_devclass, &drivers, &drv_count) == 0) {
for (i = 0; i < drv_count; i++) {
if (ACPI_GET_FEATURES(drivers[i], &features) == 0)
@ -302,8 +305,24 @@ acpi_cpu_attach(device_t dev)
}
free(drivers, M_TEMP);
}
if (sc->cpu_features)
acpi_SetInteger(sc->cpu_dev, "_PDC", sc->cpu_features);
/*
* CPU capabilities are specified as a buffer of 32-bit integers:
* revision, count, and one or more capabilities. The revision of
* "1" is not specified anywhere but seems to match Linux. We should
* also support _OSC here.
*/
if (sc->cpu_features) {
arglist.Pointer = &arg;
arglist.Count = 1;
arg.Type = ACPI_TYPE_BUFFER;
arg.Buffer.Length = sizeof(cap_set);
arg.Buffer.Pointer = (uint8_t *)cap_set;
cap_set[0] = 1; /* revision */
cap_set[1] = 1; /* number of capabilities integers */
cap_set[2] = sc->cpu_features;
AcpiEvaluateObject(sc->cpu_handle, "_PDC", &arglist, NULL);
}
/*
* Probe for Cx state support. If it isn't present, free up unused

2
sys/dev/acpica/acpivar.h
View File

@ -168,6 +168,8 @@ extern struct mtx acpi_mutex;
/*
* Various features and capabilities for the acpi_get_features() method.
* In particular, these are used for the ACPI 3.0 _PDC and _OSC methods.
* See the Intel document titled "Processor Driver Capabilities Bit
* Definitions", number 302223-002.
*/
#define ACPI_CAP_PERF_MSRS (1 << 0) /* Intel SpeedStep PERF_CTL MSRs */
#define ACPI_CAP_C1_IO_HALT (1 << 1) /* Intel C1 "IO then halt" sequence */