![Thomas Renninger](/assets/img/avatar_default.png)
Having four variables for the same thing: idle_halt, idle_nomwait, force_mwait and boot_option_idle_overrides is rather confusing and unnecessary complex. if idle= boot param is passed, only set up one variable: boot_option_idle_overrides Introduces following functional changes/fixes: - intel_idle driver does not register if any idle=xy boot param is passed. - processor_idle.c will also not register a cpuidle driver and get active if idle=halt is passed. Before a cpuidle driver with one (C1, halt) state got registered Now the default_idle function will be used which finally uses the same idle call to enter sleep state (safe_halt()), but without registering a whole cpuidle driver. That means idle= param will always avoid cpuidle drivers to register with one exception (same behavior as before): idle=nomwait may still register acpi_idle cpuidle driver, but C1 will not use mwait, but hlt. This can be a workaround for IO based deeper sleep states where C1 mwait causes problems. Signed-off-by: Thomas Renninger <trenn@suse.de> cc: x86@kernel.org Signed-off-by: Len Brown <len.brown@intel.com>
351 lines
8.2 KiB
C
351 lines
8.2 KiB
C
/*
|
|
* Copyright (C) 2005 Intel Corporation
|
|
* Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
|
|
*
|
|
* Alex Chiang <achiang@hp.com>
|
|
* - Unified x86/ia64 implementations
|
|
* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
|
|
* - Added _PDC for platforms with Intel CPUs
|
|
*/
|
|
#include <linux/dmi.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <acpi/acpi_drivers.h>
|
|
#include <acpi/processor.h>
|
|
|
|
#include "internal.h"
|
|
|
|
#define PREFIX "ACPI: "
|
|
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
|
|
ACPI_MODULE_NAME("processor_core");
|
|
|
|
static int set_no_mwait(const struct dmi_system_id *id)
|
|
{
|
|
printk(KERN_NOTICE PREFIX "%s detected - "
|
|
"disabling mwait for CPU C-states\n", id->ident);
|
|
boot_option_idle_override = IDLE_NOMWAIT;
|
|
return 0;
|
|
}
|
|
|
|
static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
|
|
{
|
|
set_no_mwait, "Extensa 5220", {
|
|
DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
|
|
DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
|
|
{},
|
|
};
|
|
|
|
#ifdef CONFIG_SMP
|
|
static int map_lapic_id(struct acpi_subtable_header *entry,
|
|
u32 acpi_id, int *apic_id)
|
|
{
|
|
struct acpi_madt_local_apic *lapic =
|
|
(struct acpi_madt_local_apic *)entry;
|
|
|
|
if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
|
|
return 0;
|
|
|
|
if (lapic->processor_id != acpi_id)
|
|
return 0;
|
|
|
|
*apic_id = lapic->id;
|
|
return 1;
|
|
}
|
|
|
|
static int map_x2apic_id(struct acpi_subtable_header *entry,
|
|
int device_declaration, u32 acpi_id, int *apic_id)
|
|
{
|
|
struct acpi_madt_local_x2apic *apic =
|
|
(struct acpi_madt_local_x2apic *)entry;
|
|
|
|
if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
|
|
return 0;
|
|
|
|
if (device_declaration && (apic->uid == acpi_id)) {
|
|
*apic_id = apic->local_apic_id;
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int map_lsapic_id(struct acpi_subtable_header *entry,
|
|
int device_declaration, u32 acpi_id, int *apic_id)
|
|
{
|
|
struct acpi_madt_local_sapic *lsapic =
|
|
(struct acpi_madt_local_sapic *)entry;
|
|
|
|
if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
|
|
return 0;
|
|
|
|
if (device_declaration) {
|
|
if ((entry->length < 16) || (lsapic->uid != acpi_id))
|
|
return 0;
|
|
} else if (lsapic->processor_id != acpi_id)
|
|
return 0;
|
|
|
|
*apic_id = (lsapic->id << 8) | lsapic->eid;
|
|
return 1;
|
|
}
|
|
|
|
static int map_madt_entry(int type, u32 acpi_id)
|
|
{
|
|
unsigned long madt_end, entry;
|
|
static struct acpi_table_madt *madt;
|
|
static int read_madt;
|
|
int apic_id = -1;
|
|
|
|
if (!read_madt) {
|
|
if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
|
|
(struct acpi_table_header **)&madt)))
|
|
madt = NULL;
|
|
read_madt++;
|
|
}
|
|
|
|
if (!madt)
|
|
return apic_id;
|
|
|
|
entry = (unsigned long)madt;
|
|
madt_end = entry + madt->header.length;
|
|
|
|
/* Parse all entries looking for a match. */
|
|
|
|
entry += sizeof(struct acpi_table_madt);
|
|
while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
|
|
struct acpi_subtable_header *header =
|
|
(struct acpi_subtable_header *)entry;
|
|
if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
|
|
if (map_lapic_id(header, acpi_id, &apic_id))
|
|
break;
|
|
} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
|
|
if (map_x2apic_id(header, type, acpi_id, &apic_id))
|
|
break;
|
|
} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
|
|
if (map_lsapic_id(header, type, acpi_id, &apic_id))
|
|
break;
|
|
}
|
|
entry += header->length;
|
|
}
|
|
return apic_id;
|
|
}
|
|
|
|
static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
|
|
{
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
union acpi_object *obj;
|
|
struct acpi_subtable_header *header;
|
|
int apic_id = -1;
|
|
|
|
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
|
|
goto exit;
|
|
|
|
if (!buffer.length || !buffer.pointer)
|
|
goto exit;
|
|
|
|
obj = buffer.pointer;
|
|
if (obj->type != ACPI_TYPE_BUFFER ||
|
|
obj->buffer.length < sizeof(struct acpi_subtable_header)) {
|
|
goto exit;
|
|
}
|
|
|
|
header = (struct acpi_subtable_header *)obj->buffer.pointer;
|
|
if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
|
|
map_lapic_id(header, acpi_id, &apic_id);
|
|
} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
|
|
map_lsapic_id(header, type, acpi_id, &apic_id);
|
|
}
|
|
|
|
exit:
|
|
if (buffer.pointer)
|
|
kfree(buffer.pointer);
|
|
return apic_id;
|
|
}
|
|
|
|
int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
|
|
{
|
|
int i;
|
|
int apic_id = -1;
|
|
|
|
apic_id = map_mat_entry(handle, type, acpi_id);
|
|
if (apic_id == -1)
|
|
apic_id = map_madt_entry(type, acpi_id);
|
|
if (apic_id == -1)
|
|
return apic_id;
|
|
|
|
for_each_possible_cpu(i) {
|
|
if (cpu_physical_id(i) == apic_id)
|
|
return i;
|
|
}
|
|
return -1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_get_cpuid);
|
|
#endif
|
|
|
|
static bool processor_physically_present(acpi_handle handle)
|
|
{
|
|
int cpuid, type;
|
|
u32 acpi_id;
|
|
acpi_status status;
|
|
acpi_object_type acpi_type;
|
|
unsigned long long tmp;
|
|
union acpi_object object = { 0 };
|
|
struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
|
|
|
|
status = acpi_get_type(handle, &acpi_type);
|
|
if (ACPI_FAILURE(status))
|
|
return false;
|
|
|
|
switch (acpi_type) {
|
|
case ACPI_TYPE_PROCESSOR:
|
|
status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
|
|
if (ACPI_FAILURE(status))
|
|
return false;
|
|
acpi_id = object.processor.proc_id;
|
|
break;
|
|
case ACPI_TYPE_DEVICE:
|
|
status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
|
|
if (ACPI_FAILURE(status))
|
|
return false;
|
|
acpi_id = tmp;
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
|
|
cpuid = acpi_get_cpuid(handle, type, acpi_id);
|
|
|
|
if ((cpuid == -1) && (num_possible_cpus() > 1))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void acpi_set_pdc_bits(u32 *buf)
|
|
{
|
|
buf[0] = ACPI_PDC_REVISION_ID;
|
|
buf[1] = 1;
|
|
|
|
/* Enable coordination with firmware's _TSD info */
|
|
buf[2] = ACPI_PDC_SMP_T_SWCOORD;
|
|
|
|
/* Twiddle arch-specific bits needed for _PDC */
|
|
arch_acpi_set_pdc_bits(buf);
|
|
}
|
|
|
|
static struct acpi_object_list *acpi_processor_alloc_pdc(void)
|
|
{
|
|
struct acpi_object_list *obj_list;
|
|
union acpi_object *obj;
|
|
u32 *buf;
|
|
|
|
/* allocate and initialize pdc. It will be used later. */
|
|
obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
|
|
if (!obj_list) {
|
|
printk(KERN_ERR "Memory allocation error\n");
|
|
return NULL;
|
|
}
|
|
|
|
obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
|
|
if (!obj) {
|
|
printk(KERN_ERR "Memory allocation error\n");
|
|
kfree(obj_list);
|
|
return NULL;
|
|
}
|
|
|
|
buf = kmalloc(12, GFP_KERNEL);
|
|
if (!buf) {
|
|
printk(KERN_ERR "Memory allocation error\n");
|
|
kfree(obj);
|
|
kfree(obj_list);
|
|
return NULL;
|
|
}
|
|
|
|
acpi_set_pdc_bits(buf);
|
|
|
|
obj->type = ACPI_TYPE_BUFFER;
|
|
obj->buffer.length = 12;
|
|
obj->buffer.pointer = (u8 *) buf;
|
|
obj_list->count = 1;
|
|
obj_list->pointer = obj;
|
|
|
|
return obj_list;
|
|
}
|
|
|
|
/*
|
|
* _PDC is required for a BIOS-OS handshake for most of the newer
|
|
* ACPI processor features.
|
|
*/
|
|
static int
|
|
acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
|
|
if (boot_option_idle_override == IDLE_NOMWAIT) {
|
|
/*
|
|
* If mwait is disabled for CPU C-states, the C2C3_FFH access
|
|
* mode will be disabled in the parameter of _PDC object.
|
|
* Of course C1_FFH access mode will also be disabled.
|
|
*/
|
|
union acpi_object *obj;
|
|
u32 *buffer = NULL;
|
|
|
|
obj = pdc_in->pointer;
|
|
buffer = (u32 *)(obj->buffer.pointer);
|
|
buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
|
|
|
|
}
|
|
status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
|
|
|
|
if (ACPI_FAILURE(status))
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Could not evaluate _PDC, using legacy perf. control.\n"));
|
|
|
|
return status;
|
|
}
|
|
|
|
void acpi_processor_set_pdc(acpi_handle handle)
|
|
{
|
|
struct acpi_object_list *obj_list;
|
|
|
|
if (arch_has_acpi_pdc() == false)
|
|
return;
|
|
|
|
obj_list = acpi_processor_alloc_pdc();
|
|
if (!obj_list)
|
|
return;
|
|
|
|
acpi_processor_eval_pdc(handle, obj_list);
|
|
|
|
kfree(obj_list->pointer->buffer.pointer);
|
|
kfree(obj_list->pointer);
|
|
kfree(obj_list);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
|
|
|
|
static acpi_status
|
|
early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
|
|
{
|
|
if (processor_physically_present(handle) == false)
|
|
return AE_OK;
|
|
|
|
acpi_processor_set_pdc(handle);
|
|
return AE_OK;
|
|
}
|
|
|
|
void __init acpi_early_processor_set_pdc(void)
|
|
{
|
|
/*
|
|
* Check whether the system is DMI table. If yes, OSPM
|
|
* should not use mwait for CPU-states.
|
|
*/
|
|
dmi_check_system(processor_idle_dmi_table);
|
|
|
|
acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX,
|
|
early_init_pdc, NULL, NULL, NULL);
|
|
acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL);
|
|
}
|