ACPI: Enable MSR (FixedHW) support for T-States
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>
diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index f4b5f7d..c26c61f 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -393,6 +393,74 @@
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 @@
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 @@
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",
