diff options
| author | Zhao Yakui <yakui.zhao@intel.com> | 2007-11-15 10:06:36 +0100 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-11-17 03:46:25 +0100 |
| commit | f79f06ab9f86d7203006d2ec8992ac80df36a34e (patch) | |
| tree | e7436b83e6315c1c28dd6cbe7fac6c0decd4ecea /drivers/acpi | |
| parent | ACPI: Get throttling info from BIOS only after evaluating _PDC (diff) | |
| download | linux-f79f06ab9f86d7203006d2ec8992ac80df36a34e.tar.xz linux-f79f06ab9f86d7203006d2ec8992ac80df36a34e.zip | |
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>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/processor_throttling.c | 74 |
1 files changed, 70 insertions, 4 deletions
diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c index f4b5f7d5dbe6..c26c61fb36c3 100644 --- a/drivers/acpi/processor_throttling.c +++ b/drivers/acpi/processor_throttling.c @@ -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", |