Refactor Xen Support for Intel Turbo Boost

Refactor the existing code that supports the Intel Turbo feature to
move all the driver specific bits in the cpufreq driver.  Create
a tri-state interface for the Turbo feature that can distinguish
amongst enabled Turbo, disabled Turbo, and processors that don't
support Turbo at all.

Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com>

2 files changed, 25 insertions, 31 deletions

diff --git a/xen/drivers/cpufreq/cpufreq_ondemand.c b/xen/drivers/cpufreq/cpufreq_ondemand.c
index 5728a8fbaf..dd4f6c45c1 100644
--- a/xen/drivers/cpufreq/cpufreq_ondemand.c
+++ b/xen/drivers/cpufreq/cpufreq_ondemand.c
@@ -58,9 +58,6 @@ static struct dbs_tuners {
 
 static struct timer dbs_timer[NR_CPUS];
 
-/* Turbo Mode */
-static int turbo_detected = 0;
-
 int write_ondemand_sampling_rate(unsigned int sampling_rate)
 {
     if ( (sampling_rate > MAX_SAMPLING_RATE / MICROSECS(1)) ||
@@ -111,10 +108,6 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
 
     policy = this_dbs_info->cur_policy;
     max = policy->max;
-    if (turbo_detected && !this_dbs_info->turbo_enabled) {
-        if (max > policy->cpuinfo.second_max_freq)
-            max = policy->cpuinfo.second_max_freq;
-    }
 
     if (unlikely(policy->resume)) {
         __cpufreq_driver_target(policy, max,CPUFREQ_RELATION_H);
@@ -276,7 +269,6 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event)
             } else
                 dbs_tuners_ins.sampling_rate = usr_sampling_rate;
         }
-        this_dbs_info->turbo_enabled = 1;
         dbs_timer_init(this_dbs_info);
 
         break;
@@ -353,13 +345,6 @@ struct cpufreq_governor cpufreq_gov_dbs = {
 
 static int __init cpufreq_gov_dbs_init(void)
 {
-#ifdef CONFIG_X86
-    unsigned int eax = cpuid_eax(6);
-    if ( eax & 0x2 ) {
-        turbo_detected = 1;
-        printk(XENLOG_INFO "Turbo Mode detected!\n");
-    }
-#endif
     return cpufreq_register_governor(&cpufreq_gov_dbs);
 }
 __initcall(cpufreq_gov_dbs_init);
@@ -404,19 +389,3 @@ void cpufreq_dbs_timer_resume(void)
         }
     }
 }
-
-void cpufreq_dbs_enable_turbo(int cpuid)
-{
-    per_cpu(cpu_dbs_info, cpuid).turbo_enabled = 1;
-}
-
-void cpufreq_dbs_disable_turbo(int cpuid)
-{
-    per_cpu(cpu_dbs_info, cpuid).turbo_enabled = 0;
-}
-
-unsigned int cpufreq_dbs_get_turbo_status(int cpuid)
-{
-    return turbo_detected && per_cpu(cpu_dbs_info, cpuid).turbo_enabled;
-}
-
diff --git a/xen/drivers/cpufreq/utility.c b/xen/drivers/cpufreq/utility.c
index c730df951f..612f7e0919 100644
--- a/xen/drivers/cpufreq/utility.c
+++ b/xen/drivers/cpufreq/utility.c
@@ -394,6 +394,31 @@ int cpufreq_driver_getavg(unsigned int cpu, unsigned int flag)
     return policy->cur;
 }
 
+void cpufreq_enable_turbo(int cpuid)
+{
+    struct cpufreq_policy *policy;
+
+    policy = cpufreq_cpu_policy[cpuid];
+    if (policy->turbo != CPUFREQ_TURBO_UNSUPPORTED)
+        policy->turbo = CPUFREQ_TURBO_ENABLED;
+}
+
+void cpufreq_disable_turbo(int cpuid)
+{
+    struct cpufreq_policy *policy;
+
+    policy = cpufreq_cpu_policy[cpuid];
+    if (policy->turbo != CPUFREQ_TURBO_UNSUPPORTED)
+        policy->turbo = CPUFREQ_TURBO_DISABLED;
+}
+
+int cpufreq_get_turbo_status(int cpuid)
+{
+    struct cpufreq_policy *policy;
+
+    policy = cpufreq_cpu_policy[cpuid];
+    return policy->turbo;
+}
 
 /*********************************************************************
  *                 POLICY                                            *