From 90d05ca371755ba0ef76303e87522613ffc71d74 Mon Sep 17 00:00:00 2001
From: Andre Przywara <andre.przywara@amd.com>
Date: Tue, 4 Sep 2012 08:28:08 +0000
Subject: [PATCH] --- yaml --- r: 328718 b: refs/heads/master c:
 11269ff506888a06b19c8c7a3297114f30673973 h: refs/heads/master v: v3

---
 [refs]                               |  2 +-
 trunk/drivers/cpufreq/Kconfig.x86    | 12 ++++++++
 trunk/drivers/cpufreq/acpi-cpufreq.c | 46 ++++++++++++++++++++++++++--
 3 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index da669b16e87f..4b6c54181e9a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 615b7300717b9ad5c23d1f391843484fe30f6c12
+refs/heads/master: 11269ff506888a06b19c8c7a3297114f30673973
diff --git a/trunk/drivers/cpufreq/Kconfig.x86 b/trunk/drivers/cpufreq/Kconfig.x86
index b36ca1f68bff..934854ae5eb4 100644
--- a/trunk/drivers/cpufreq/Kconfig.x86
+++ b/trunk/drivers/cpufreq/Kconfig.x86
@@ -33,6 +33,18 @@ config X86_ACPI_CPUFREQ
 
 	  If in doubt, say N.
 
+config X86_ACPI_CPUFREQ_CPB
+	default y
+	bool "Legacy cpb sysfs knob support for AMD CPUs"
+	depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
+	help
+	  The powernow-k8 driver used to provide a sysfs knob called "cpb"
+	  to disable the Core Performance Boosting feature of AMD CPUs. This
+	  file has now been superseeded by the more generic "boost" entry.
+
+	  By enabling this option the acpi_cpufreq driver provides the old
+	  entry in addition to the new boost ones, for compatibility reasons.
+
 config ELAN_CPUFREQ
 	tristate "AMD Elan SC400 and SC410"
 	select CPU_FREQ_TABLE
diff --git a/trunk/drivers/cpufreq/acpi-cpufreq.c b/trunk/drivers/cpufreq/acpi-cpufreq.c
index dffa7af1db71..0d048f6a2b23 100644
--- a/trunk/drivers/cpufreq/acpi-cpufreq.c
+++ b/trunk/drivers/cpufreq/acpi-cpufreq.c
@@ -133,8 +133,7 @@ static void boost_set_msrs(bool enable, const struct cpumask *cpumask)
 	wrmsr_on_cpus(cpumask, msr_addr, msrs);
 }
 
-static ssize_t store_global_boost(struct kobject *kobj, struct attribute *attr,
-				  const char *buf, size_t count)
+static ssize_t _store_boost(const char *buf, size_t count)
 {
 	int ret;
 	unsigned long val = 0;
@@ -161,6 +160,12 @@ static ssize_t store_global_boost(struct kobject *kobj, struct attribute *attr,
 	return count;
 }
 
+static ssize_t store_global_boost(struct kobject *kobj, struct attribute *attr,
+				  const char *buf, size_t count)
+{
+	return _store_boost(buf, count);
+}
+
 static ssize_t show_global_boost(struct kobject *kobj,
 				 struct attribute *attr, char *buf)
 {
@@ -171,6 +176,21 @@ static struct global_attr global_boost = __ATTR(boost, 0644,
 						show_global_boost,
 						store_global_boost);
 
+#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
+static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
+			 size_t count)
+{
+	return _store_boost(buf, count);
+}
+
+static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
+{
+	return sprintf(buf, "%u\n", boost_enabled);
+}
+
+static struct freq_attr cpb = __ATTR(cpb, 0644, show_cpb, store_cpb);
+#endif
+
 static int check_est_cpu(unsigned int cpuid)
 {
 	struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
@@ -889,6 +909,7 @@ static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
 
 static struct freq_attr *acpi_cpufreq_attr[] = {
 	&cpufreq_freq_attr_scaling_available_freqs,
+	NULL,	/* this is a placeholder for cpb, do not remove */
 	NULL,
 };
 
@@ -960,6 +981,27 @@ static int __init acpi_cpufreq_init(void)
 	if (ret)
 		return ret;
 
+#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
+	/* this is a sysfs file with a strange name and an even stranger
+	 * semantic - per CPU instantiation, but system global effect.
+	 * Lets enable it only on AMD CPUs for compatibility reasons and
+	 * only if configured. This is considered legacy code, which
+	 * will probably be removed at some point in the future.
+	 */
+	if (check_amd_hwpstate_cpu(0)) {
+		struct freq_attr **iter;
+
+		pr_debug("adding sysfs entry for cpb\n");
+
+		for (iter = acpi_cpufreq_attr; *iter != NULL; iter++)
+			;
+
+		/* make sure there is a terminator behind it */
+		if (iter[1] == NULL)
+			*iter = &cpb;
+	}
+#endif
+
 	ret = cpufreq_register_driver(&acpi_cpufreq_driver);
 	if (ret)
 		free_acpi_perf_data();