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ACPI: Enable MSR (FixedHW) support for T-States

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Add throttling control via MSR when T-states uses
the FixHW Control Status registers.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Li Shaohua <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Zhao Yakui 2007-11-15 17:06:36 +08:00 committed by Len Brown
parent 0ac3c57131
commit f79f06ab9f
2 changed files with 73 additions and 4 deletions
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3
arch/x86/kernel/acpi/processor.c
View file

@ -49,6 +49,9 @@ static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c)
if (cpu_has(c, X86_FEATURE_EST))
buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;
if (cpu_has(c, X86_FEATURE_ACPI))
buf[2] |= ACPI_PDC_T_FFH;
obj->type = ACPI_TYPE_BUFFER;
obj->buffer.length = 12;
obj->buffer.pointer = (u8 *) buf;

74
drivers/acpi/processor_throttling.c
View file

@ -393,6 +393,74 @@ static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
return 0;
}
#ifdef CONFIG_X86
static int acpi_throttling_rdmsr(struct acpi_processor *pr,
acpi_integer * value)
{
struct cpuinfo_x86 *c;
u64 msr_high, msr_low;
unsigned int cpu;
u64 msr = 0;
int ret = -1;
cpu = pr->id;
c = &cpu_data(cpu);
if ((c->x86_vendor != X86_VENDOR_INTEL) ||
!cpu_has(c, X86_FEATURE_ACPI)) {
printk(KERN_ERR PREFIX
"HARDWARE addr space,NOT supported yet\n");
} else {
msr_low = 0;
msr_high = 0;
rdmsr_on_cpu(cpu, MSR_IA32_THERM_CONTROL,
(u32 *)&msr_low , (u32 *) &msr_high);
msr = (msr_high << 32) | msr_low;
*value = (acpi_integer) msr;
ret = 0;
}
return ret;
}
static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value)
{
struct cpuinfo_x86 *c;
unsigned int cpu;
int ret = -1;
u64 msr;
cpu = pr->id;
c = &cpu_data(cpu);
if ((c->x86_vendor != X86_VENDOR_INTEL) ||
!cpu_has(c, X86_FEATURE_ACPI)) {
printk(KERN_ERR PREFIX
"HARDWARE addr space,NOT supported yet\n");
} else {
msr = value;
wrmsr_on_cpu(cpu, MSR_IA32_THERM_CONTROL,
msr & 0xffffffff, msr >> 32);
ret = 0;
}
return ret;
}
#else
static int acpi_throttling_rdmsr(struct acpi_processor *pr,
acpi_integer * value)
{
printk(KERN_ERR PREFIX
"HARDWARE addr space,NOT supported yet\n");
return -1;
}
static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value)
{
printk(KERN_ERR PREFIX
"HARDWARE addr space,NOT supported yet\n");
return -1;
}
#endif
static int acpi_read_throttling_status(struct acpi_processor *pr,
acpi_integer *value)
{
@ -417,8 +485,7 @@ static int acpi_read_throttling_status(struct acpi_processor *pr,
ret = 0;
break;
case ACPI_ADR_SPACE_FIXED_HARDWARE:
printk(KERN_ERR PREFIX
"HARDWARE addr space,NOT supported yet\n");
ret = acpi_throttling_rdmsr(pr, value);
break;
default:
printk(KERN_ERR PREFIX "Unknown addr space %d\n",
@ -451,8 +518,7 @@ static int acpi_write_throttling_state(struct acpi_processor *pr,
ret = 0;
break;
case ACPI_ADR_SPACE_FIXED_HARDWARE:
printk(KERN_ERR PREFIX
"HARDWARE addr space,NOT supported yet\n");
ret = acpi_throttling_wrmsr(pr, value);
break;
default:
printk(KERN_ERR PREFIX "Unknown addr space %d\n",