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
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