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| author | Huang Rui <ray.huang@amd.com> | 2015-08-27 16:07:38 +0800 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2015-08-27 07:53:19 -0700 |
| commit | 1ed32160dba643e61504b334f45b002198c88254 (patch) | |
| tree | 57fd52b4175d960c2c778c78015cd619d8d50fd6 /drivers/hwmon/fam15h_power.c | |
| parent | 5aeb5d205e122b70742df94a7d51a3502f1a8277 (diff) | |
| download | linux-1ed32160dba643e61504b334f45b002198c88254.tar.gz linux-1ed32160dba643e61504b334f45b002198c88254.tar.bz2 linux-1ed32160dba643e61504b334f45b002198c88254.zip | |
hwmon: (fam15h_power) Add ratio of Tsample to the PTSC period
This patch adds a member (cpu_pwr_sample_ratio) of fam15h_power_data,
that represents the ratio of compute unit power accumulator sample
period to the PTSC counter period.
Tsample: compute unit power accumulator sample period
Tref: the performance timestamp counter period
PTSC: performance timestamp counter
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/fam15h_power.c')
| -rw-r--r-- | drivers/hwmon/fam15h_power.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c index 41174903009c..e80ee23b62d3 100644 --- a/drivers/hwmon/fam15h_power.c +++ b/drivers/hwmon/fam15h_power.c @@ -46,6 +46,7 @@ struct fam15h_power_data { unsigned int tdp_to_watts; unsigned int base_tdp; unsigned int processor_pwr_watts; + unsigned int cpu_pwr_sample_ratio; }; static ssize_t show_power(struct device *dev, @@ -188,7 +189,7 @@ static int fam15h_power_resume(struct pci_dev *pdev) static void fam15h_power_init_data(struct pci_dev *f4, struct fam15h_power_data *data) { - u32 val; + u32 val, eax, ebx, ecx, edx; u64 tmp; pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val); @@ -209,6 +210,19 @@ static void fam15h_power_init_data(struct pci_dev *f4, /* convert to microWatt */ data->processor_pwr_watts = (tmp * 15625) >> 10; + + cpuid(0x80000007, &eax, &ebx, &ecx, &edx); + + /* CPUID Fn8000_0007:EDX[12] indicates to support accumulated power */ + if (!(edx & BIT(12))) + return; + + /* + * determine the ratio of the compute unit power accumulator + * sample period to the PTSC counter period by executing CPUID + * Fn8000_0007:ECX + */ + data->cpu_pwr_sample_ratio = ecx; } static int fam15h_power_probe(struct pci_dev *pdev, |