[RFC PATCH 04/31] cpufreq: make turbo settings to be configurable

[Oleksandr Tyshchenko <olekstysh@gmail.com>]

From: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>

This settings is not needed for some architectures.
So make it to be configurable and use it for x86
architecture.

This is a rebased version of the original patch:
https://lists.xen.org/archives/html/xen-devel/2014-11/msg00942.html

Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
CC: Jan Beulich <jbeulich@suse.com>
CC: Andrew Cooper <andrew.cooper3@citrix.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Julien Grall <julien.grall@linaro.org>
---
 xen/arch/x86/Kconfig          |  1 +
 xen/drivers/cpufreq/Kconfig   |  3 +++
 xen/drivers/cpufreq/utility.c | 11 ++++++++++-
 xen/drivers/pm/stat.c         |  6 ++++++
 xen/include/xen/cpufreq.h     |  6 ++++++
 5 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig
index 86c8eca..c1eac1d 100644
--- a/xen/arch/x86/Kconfig
+++ b/xen/arch/x86/Kconfig
@@ -24,6 +24,7 @@ config X86
 	select NUMA
 	select VGA
 	select HAS_PM
+	select HAS_CPU_TURBO
 
 config ARCH_DEFCONFIG
 	string
diff --git a/xen/drivers/cpufreq/Kconfig b/xen/drivers/cpufreq/Kconfig
index cce80f4..427ea2a 100644
--- a/xen/drivers/cpufreq/Kconfig
+++ b/xen/drivers/cpufreq/Kconfig
@@ -1,3 +1,6 @@
 
 config HAS_CPUFREQ
 	bool
+
+config HAS_CPU_TURBO
+	bool
diff --git a/xen/drivers/cpufreq/utility.c b/xen/drivers/cpufreq/utility.c
index a687e5a..25bf983 100644
--- a/xen/drivers/cpufreq/utility.c
+++ b/xen/drivers/cpufreq/utility.c
@@ -209,7 +209,9 @@ int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 {
     unsigned int min_freq = ~0;
     unsigned int max_freq = 0;
+#ifdef CONFIG_HAS_CPU_TURBO
     unsigned int second_max_freq = 0;
+#endif
     unsigned int i;
 
     for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
@@ -221,6 +223,7 @@ int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
         if (freq > max_freq)
             max_freq = freq;
     }
+#ifdef CONFIG_HAS_CPU_TURBO
     for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
         unsigned int freq = table[i].frequency;
         if (freq == CPUFREQ_ENTRY_INVALID || freq == max_freq)
@@ -234,9 +237,13 @@ int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
         printk("max_freq: %u    second_max_freq: %u\n",
                max_freq, second_max_freq);
 
+    policy->cpuinfo.second_max_freq = second_max_freq;
+#else /* !CONFIG_HAS_CPU_TURBO */
+    if (cpufreq_verbose)
+        printk("max_freq: %u\n", max_freq);
+#endif /* CONFIG_HAS_CPU_TURBO */
     policy->min = policy->cpuinfo.min_freq = min_freq;
     policy->max = policy->cpuinfo.max_freq = max_freq;
-    policy->cpuinfo.second_max_freq = second_max_freq;
 
     if (policy->min == ~0)
         return -EINVAL;
@@ -390,6 +397,7 @@ int cpufreq_driver_getavg(unsigned int cpu, unsigned int flag)
     return policy->cur;
 }
 
+#ifdef CONFIG_HAS_CPU_TURBO
 int cpufreq_update_turbo(int cpuid, int new_state)
 {
     struct cpufreq_policy *policy;
@@ -430,6 +438,7 @@ int cpufreq_get_turbo_status(int cpuid)
     policy = per_cpu(cpufreq_cpu_policy, cpuid);
     return policy && policy->turbo == CPUFREQ_TURBO_ENABLED;
 }
+#endif /* CONFIG_HAS_CPU_TURBO */
 
 /*********************************************************************
  *                 POLICY                                            *
diff --git a/xen/drivers/pm/stat.c b/xen/drivers/pm/stat.c
index 2dbde1c..133e64d 100644
--- a/xen/drivers/pm/stat.c
+++ b/xen/drivers/pm/stat.c
@@ -290,7 +290,11 @@ static int get_cpufreq_para(struct xen_sysctl_pm_op *op)
             &op->u.get_para.u.ondemand.sampling_rate,
             &op->u.get_para.u.ondemand.up_threshold);
     }
+#ifdef CONFIG_HAS_CPU_TURBO
     op->u.get_para.turbo_enabled = cpufreq_get_turbo_status(op->cpuid);
+#else
+    op->u.get_para.turbo_enabled = 0;
+#endif
 
     return ret;
 }
@@ -473,6 +477,7 @@ int do_pm_op(struct xen_sysctl_pm_op *op)
         break;
     }
 
+#ifdef CONFIG_HAS_CPU_TURBO
     case XEN_SYSCTL_pm_op_enable_turbo:
     {
         ret = cpufreq_update_turbo(op->cpuid, CPUFREQ_TURBO_ENABLED);
@@ -484,6 +489,7 @@ int do_pm_op(struct xen_sysctl_pm_op *op)
         ret = cpufreq_update_turbo(op->cpuid, CPUFREQ_TURBO_DISABLED);
         break;
     }
+#endif /* CONFIG_HAS_CPU_TURBO */
 
     default:
         printk("not defined sub-hypercall @ do_pm_op\n");
diff --git a/xen/include/xen/cpufreq.h b/xen/include/xen/cpufreq.h
index 30c70c9..2e0c16a 100644
--- a/xen/include/xen/cpufreq.h
+++ b/xen/include/xen/cpufreq.h
@@ -39,7 +39,9 @@ extern struct acpi_cpufreq_data *cpufreq_drv_data[NR_CPUS];
 
 struct cpufreq_cpuinfo {
     unsigned int        max_freq;
+#ifdef CONFIG_HAS_CPU_TURBO
     unsigned int        second_max_freq;    /* P1 if Turbo Mode is on */
+#endif
     unsigned int        min_freq;
     unsigned int        transition_latency; /* in 10^(-9) s = nanoseconds */
 };
@@ -72,9 +74,11 @@ struct cpufreq_policy {
 
     bool_t              resume; /* flag for cpufreq 1st run
                                  * S3 wakeup, hotplug cpu, etc */
+#ifdef CONFIG_HAS_CPU_TURBO
     s8                  turbo;  /* tristate flag: 0 for unsupported
                                  * -1 for disable, 1 for enabled
                                  * See CPUFREQ_TURBO_* below for defines */
+#endif
     bool_t              aperf_mperf; /* CPU has APERF/MPERF MSRs */
 };
 DECLARE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_policy);
@@ -138,8 +142,10 @@ extern int cpufreq_driver_getavg(unsigned int cpu, unsigned int flag);
 #define CPUFREQ_TURBO_UNSUPPORTED   0
 #define CPUFREQ_TURBO_ENABLED       1
 
+#ifdef CONFIG_HAS_CPU_TURBO
 extern int cpufreq_update_turbo(int cpuid, int new_state);
 extern int cpufreq_get_turbo_status(int cpuid);
+#endif
 
 static __inline__ int 
 __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
-- 
2.7.4


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