diff options
| author | Patrick Rudolph <patrick.rudolph@9elements.com> | 2020-07-26 14:23:37 +0200 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-11-22 22:31:40 +0000 |
| commit | b01ac7e26453677318776885d4ab870f59553ae6 (patch) | |
| tree | 8cc66d66f6135a56c857c86397caa6e35e856096 /src/arch | |
| parent | 44cfde02d5d694a6f0eced12333d2350acb498d1 (diff) | |
cpu/intel/common: Fill cpu voltage in SMBIOS tables
Introduce a weak function to let the platform code provide the processor
voltage in 100mV units.
Implement the function on Intel platforms using the MSR_PERF_STATUS msr.
On other platforms the processor voltage still reads as unknown.
Tested on Intel CFL. The CPU voltage is correctly advertised.
Change-Id: I31a7efcbeede50d986a1c096a4a59a316e09f825
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43904
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/smbios.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/arch/x86/smbios.c b/src/arch/x86/smbios.c index dc676cf141..da77284d37 100644 --- a/src/arch/x86/smbios.c +++ b/src/arch/x86/smbios.c @@ -493,6 +493,12 @@ unsigned int __weak smbios_cache_conf_operation_mode(u8 level) return SMBIOS_CACHE_OP_MODE_UNKNOWN; /* Unknown */ } +/* Returns the processor voltage in 100mV units */ +unsigned int __weak smbios_cpu_get_voltage(void) +{ + return 0; /* Unknown */ +} + static size_t get_number_of_caches(struct cpuid_result res_deterministic_cache) { size_t max_logical_cpus_sharing_cache = 0; @@ -595,6 +601,7 @@ static int smbios_write_type3(unsigned long *current, int handle) static int smbios_write_type4(unsigned long *current, int handle) { + unsigned int cpu_voltage; struct cpuid_result res; struct smbios_type4 *t = (struct smbios_type4 *)*current; int len = sizeof(struct smbios_type4); @@ -686,6 +693,9 @@ static int smbios_write_type4(unsigned long *current, int handle) } } t->processor_characteristics = characteristics | smbios_processor_characteristics(); + cpu_voltage = smbios_cpu_get_voltage(); + if (cpu_voltage > 0) + t->voltage = 0x80 | cpu_voltage; *current += len; return len; |