From: "Gautham R. Shenoy" <e...@linux.vnet.ibm.com> Create a helper routine that can return the cpu-frequency for the corresponding pstate_id.
Also, cache the values of the pstate_max, pstate_min and pstate_nominal and nr_pstates in a static structure so that they can be reused in the future to perform any validations. Signed-off-by: Gautham R. Shenoy <e...@linux.vnet.ibm.com> --- drivers/cpufreq/powernv-cpufreq.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c index 345501e..d0a8dee 100644 --- a/drivers/cpufreq/powernv-cpufreq.c +++ b/drivers/cpufreq/powernv-cpufreq.c @@ -37,6 +37,15 @@ static DEFINE_PER_CPU(struct mutex, freq_switch_lock); #define POWERNV_MAX_PSTATES 256 static struct cpufreq_frequency_table powernv_freqs[POWERNV_MAX_PSTATES+1]; +struct powernv_pstate_info { + int pstate_min_id; + int pstate_max_id; + int pstate_nominal_id; + int nr_pstates; +}; + +static struct powernv_pstate_info powernv_pstate_info; + /* * Initialize the freq table based on data obtained @@ -106,9 +115,28 @@ static int init_powernv_pstates(void) powernv_freqs[i].driver_data = 0; powernv_freqs[i].frequency = CPUFREQ_TABLE_END; + powernv_pstate_info.pstate_min_id = pstate_min; + powernv_pstate_info.pstate_max_id = pstate_max; + powernv_pstate_info.pstate_nominal_id = pstate_nominal; + powernv_pstate_info.nr_pstates = nr_pstates; + return 0; } +/** + * Returns the cpu frequency corresponding to the pstate_id. + */ +static unsigned int pstate_id_to_freq(int pstate_id) +{ + int i; + + i = powernv_pstate_info.pstate_max_id - pstate_id; + + BUG_ON(i >= powernv_pstate_info.nr_pstates || i < 0); + WARN_ON(powernv_freqs[i].driver_data != pstate_id); + return powernv_freqs[i].frequency; +} + static struct freq_attr *powernv_cpu_freq_attr[] = { &cpufreq_freq_attr_scaling_available_freqs, NULL, -- 1.8.3.1 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev