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Be sure to register with cpufreq(4). On systems that only supported

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throttling, neglecting to do this kept the sysctls from appearing.
Attach an acpi_throttle device to each CPU that supports it.
Don't add a device if the P_BLK is invalid or if _PTC is not present.
This removes extraneous probe/attach failure messages on some machines.
Make the cpu throttle state local to the softc to account for partial
successes when changing the clock rate on MP machines.
This commit is contained in:
Nate Lawson 2005-02-13 05:34:52 +00:00
parent 8b39b8ce63
commit 3bd74b84f5
1 changed files with 36 additions and 9 deletions
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43
sys/dev/acpica/acpi_throttle.c
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@ -60,6 +60,7 @@ struct acpi_throttle_softc {
uint32_t cpu_p_blk_len; /* P_BLK length (must be 6). */
struct resource *cpu_p_cnt; /* Throttling control register */
int cpu_p_type; /* Resource type for cpu_p_cnt. */
uint32_t cpu_thr_state; /* Current throttle setting. */
};
#define THR_GET_REG(reg) \
@ -87,7 +88,6 @@ struct acpi_throttle_softc {
static uint32_t cpu_duty_offset; /* Offset in P_CNT of throttle val. */
static uint32_t cpu_duty_width; /* Bit width of throttle value. */
static uint32_t cpu_throttle_state; /* Current throttle setting. */
static int thr_rid; /* Driver-wide resource id. */
static int thr_quirks; /* Indicate any hardware bugs. */
@ -127,19 +127,37 @@ DRIVER_MODULE(acpi_throttle, cpu, acpi_throttle_driver, acpi_throttle_devclass,
static void
acpi_throttle_identify(driver_t *driver, device_t parent)
{
ACPI_BUFFER buf;
ACPI_HANDLE handle;
ACPI_OBJECT *obj;
/* Make sure we're not being doubly invoked. */
if (device_find_child(parent, "acpi_throttle", 0) != NULL)
if (device_find_child(parent, "acpi_throttle", -1) != NULL)
return;
/* Check for a valid duty width and parent CPU type. */
if (acpi_get_handle(parent) == NULL)
handle = acpi_get_handle(parent);
if (handle == NULL)
return;
if (AcpiGbl_FADT->DutyWidth == 0 ||
acpi_get_type(parent) != ACPI_TYPE_PROCESSOR)
return;
if (BUS_ADD_CHILD(parent, 0, "acpi_throttle", 0) == NULL)
device_printf(parent, "acpi_throttle: add child failed\n");
/*
* Add a child if there's a non-NULL P_BLK and correct length, or
* if the _PTC method is present.
*/
buf.Pointer = NULL;
buf.Length = ACPI_ALLOCATE_BUFFER;
if (ACPI_FAILURE(AcpiEvaluateObject(handle, NULL, NULL, &buf)))
return;
obj = (ACPI_OBJECT *)buf.Pointer;
if ((obj->Processor.PblkAddress && obj->Processor.PblkLength >= 4) ||
ACPI_SUCCESS(AcpiEvaluateObject(handle, "_PTC", NULL, NULL))) {
if (BUS_ADD_CHILD(parent, 0, "acpi_throttle", -1) == NULL)
device_printf(parent, "add throttle child failed\n");
}
AcpiOsFree(obj);
}
static int
@ -157,6 +175,7 @@ acpi_throttle_attach(device_t dev)
ACPI_BUFFER buf;
ACPI_OBJECT *obj;
ACPI_STATUS status;
int error;
sc = device_get_softc(dev);
sc->cpu_dev = dev;
@ -179,7 +198,14 @@ acpi_throttle_attach(device_t dev)
if (device_get_unit(dev) == 0)
acpi_throttle_quirks(sc);
return (acpi_throttle_evaluate(sc));
/* Attempt to attach the actual throttling register. */
error = acpi_throttle_evaluate(sc);
if (error)
return (error);
/* Everything went ok, register with cpufreq(4). */
cpufreq_register(dev);
return (0);
}
static int
@ -337,7 +363,7 @@ acpi_thr_set(device_t dev, const struct cf_setting *set)
return (EINVAL);
/* If we're at this setting, don't bother applying it again. */
if (speed == cpu_throttle_state)
if (speed == sc->cpu_thr_state)
return (0);
/* Get the current P_CNT value and disable throttling */
@ -357,7 +383,7 @@ acpi_thr_set(device_t dev, const struct cf_setting *set)
p_cnt |= CPU_P_CNT_THT_EN;
THR_SET_REG(sc->cpu_p_cnt, p_cnt);
}
cpu_throttle_state = speed;
sc->cpu_thr_state = speed;
return (0);
}
@ -375,6 +401,7 @@ acpi_thr_get(device_t dev, struct cf_setting *set)
/* Get the current throttling setting from P_CNT. */
p_cnt = THR_GET_REG(sc->cpu_p_cnt);
clk_val = (p_cnt >> cpu_duty_offset) & (CPU_MAX_SPEED - 1);
sc->cpu_thr_state = clk_val;
memset(set, CPUFREQ_VAL_UNKNOWN, sizeof(*set));
set->freq = CPU_SPEED_PERCENT(clk_val);