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Subject[PATCH 5/5] cpufreq: Add support for actual freq
Date
From: Borislav Petkov <borislav.petkov@amd.com>

Modify the scaling_cur_freq interface to show the actual core frequency
when boosting is supported and enabled on the core.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
---
arch/x86/kernel/cpu/cpufreq/powernow-k8.c | 18 ++++++++++++++++++
drivers/cpufreq/cpufreq.c | 9 ++++++++-
include/linux/cpufreq.h | 1 +
3 files changed, 27 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index f411250..a36a18c 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -58,6 +58,8 @@ static int cpu_family = CPU_OPTERON;
static bool cpb_capable, cpb_disabled;
static struct msr __percpu *msrs;

+static bool can_aperf_mperf;
+
static struct cpufreq_driver cpufreq_amd64_driver;

#ifndef CONFIG_SMP
@@ -1465,6 +1467,18 @@ static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)

define_one_freq_rw(cpb);

+static ssize_t show_actual_freq(struct cpufreq_policy *policy, char *buf)
+{
+ unsigned long freq;
+
+ if (can_aperf_mperf)
+ freq = cpufreq_get_measured_perf(policy, policy->cpu);
+ else
+ freq = policy->cur;
+
+ return sprintf(buf, "%lu\n", freq);
+}
+
static struct freq_attr *powernow_k8_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
&cpb,
@@ -1478,6 +1492,7 @@ static struct cpufreq_driver cpufreq_amd64_driver = {
.init = powernowk8_cpu_init,
.exit = __devexit_p(powernowk8_cpu_exit),
.get = powernowk8_get,
+ .cur_freq = show_actual_freq,
.name = "powernow-k8",
.owner = THIS_MODULE,
.attr = powernow_k8_attr,
@@ -1531,6 +1546,9 @@ static int __cpuinit powernowk8_init(void)
printk(KERN_CONT "on.\n");
}

+ if (boot_cpu_has(X86_FEATURE_APERFMPERF))
+ can_aperf_mperf = true;
+
return cpufreq_register_driver(&cpufreq_amd64_driver);
}

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 6bfea8d..bf34307 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -457,7 +457,14 @@ show_one(cpuinfo_max_freq, cpuinfo.max_freq);
show_one(cpuinfo_transition_latency, cpuinfo.transition_latency);
show_one(scaling_min_freq, min);
show_one(scaling_max_freq, max);
-show_one(scaling_cur_freq, cur);
+
+static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf)
+{
+ if (cpufreq_driver->cur_freq)
+ return cpufreq_driver->cur_freq(policy, buf);
+
+ return sprintf(buf, "%u\n", policy->cur);
+}

static int __cpufreq_set_policy(struct cpufreq_policy *data,
struct cpufreq_policy *policy);
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index c8d731c..5744312 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -237,6 +237,7 @@ struct cpufreq_driver {
int (*exit) (struct cpufreq_policy *policy);
int (*suspend) (struct cpufreq_policy *policy, pm_message_t pmsg);
int (*resume) (struct cpufreq_policy *policy);
+ ssize_t (*cur_freq) (struct cpufreq_policy *policy, char *buf);
struct freq_attr **attr;
};

--
1.7.0


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