[PATCH v5 3/7] cpufreq:acpi:x86: Adjust the acpi-cpufreq.c code to work with common boost solution

[Lukasz Majewski <l.majewski@samsung.com>]

The Intel's hardware based boost solution driver has been changed to cooperate with
common cpufreq boost framework.

The global sysfs boost attribute entry code (/sys/devices/system/cpu/cpufreq/boost)
has been moved to a core cpufreq code. This attribute is now only visible,
when cpufreq driver supports it.

The _store_boost() function has been redesigned to be used as set_boost_freq
callback.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>

---
Changes for v5:
- Remove acpi-cpufreq's boost_enabled global flag and reuse one defined at
  cpufreq core

Changes for v4:
- add _store_boost to acpi_cpufreq_driver structure

Changes for v3:
- Bring back boost_enabled as a global flag
- Move boost_supported to cpufreq_driver structure

Changes for v2:
- Replace boost_enabled and boost_supported global flags with proper entries
  at struct cpufreq_driver.
- Removal of struct cpufreq_boost

 drivers/cpufreq/acpi-cpufreq.c |   69 ++++++++++++----------------------------
 1 file changed, 21 insertions(+), 48 deletions(-)

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 3926402..113a928 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -81,7 +81,6 @@ static struct acpi_processor_performance __percpu *acpi_perf_data;
 static struct cpufreq_driver acpi_cpufreq_driver;
 
 static unsigned int acpi_pstate_strict;
-static bool boost_enabled, boost_supported;
 static struct msr __percpu *msrs;
 
 static bool boost_state(unsigned int cpu)
@@ -134,49 +133,33 @@ static void boost_set_msrs(bool enable, const struct cpumask *cpumask)
 	wrmsr_on_cpus(cpumask, msr_addr, msrs);
 }
 
-static ssize_t _store_boost(const char *buf, size_t count)
+static int _store_boost(int val)
+{
+	get_online_cpus();
+	boost_set_msrs(val, cpu_online_mask);
+	put_online_cpus();
+	pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis");
+
+	return 0;
+}
+
+static ssize_t store_boost(const char *buf, size_t count)
 {
 	int ret;
 	unsigned long val = 0;
 
-	if (!boost_supported)
+	if (!acpi_cpufreq_driver.boost_supported)
 		return -EINVAL;
 
 	ret = kstrtoul(buf, 10, &val);
 	if (ret || (val > 1))
 		return -EINVAL;
 
-	if ((val && boost_enabled) || (!val && !boost_enabled))
-		return count;
-
-	get_online_cpus();
-
-	boost_set_msrs(val, cpu_online_mask);
-
-	put_online_cpus();
-
-	boost_enabled = val;
-	pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis");
+	_store_boost((int) val);
 
 	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)
-{
-	return sprintf(buf, "%u\n", boost_enabled);
-}
-
-static struct global_attr global_boost = __ATTR(boost, 0644,
-						show_global_boost,
-						store_global_boost);
-
 static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
 {
 	struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
@@ -190,12 +173,12 @@ cpufreq_freq_attr_ro(freqdomain_cpus);
 static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
 			 size_t count)
 {
-	return _store_boost(buf, count);
+	return store_boost(buf, count);
 }
 
 static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
 {
-	return sprintf(buf, "%u\n", boost_enabled);
+	return sprintf(buf, "%u\n", cpufreq_boost_enabled());
 }
 
 static struct freq_attr cpb = __ATTR(cpb, 0644, show_cpb, store_cpb);
@@ -583,7 +566,7 @@ static int boost_notify(struct notifier_block *nb, unsigned long action,
 	switch (action) {
 	case CPU_UP_PREPARE:
 	case CPU_UP_PREPARE_FROZEN:
-		boost_set_msrs(boost_enabled, cpumask);
+		boost_set_msrs(cpufreq_boost_enabled(), cpumask);
 		break;
 
 	case CPU_DOWN_PREPARE:
@@ -943,6 +926,7 @@ static struct cpufreq_driver acpi_cpufreq_driver = {
 	.name		= "acpi-cpufreq",
 	.owner		= THIS_MODULE,
 	.attr		= acpi_cpufreq_attr,
+	.enable_boost   = _store_boost,
 };
 
 static void __init acpi_cpufreq_boost_init(void)
@@ -953,33 +937,22 @@ static void __init acpi_cpufreq_boost_init(void)
 		if (!msrs)
 			return;
 
-		boost_supported = true;
-		boost_enabled = boost_state(0);
+		cpufreq_set_boost_enabled(boost_state(0));
+		acpi_cpufreq_driver.boost_supported = true;
 
 		get_online_cpus();
 
 		/* Force all MSRs to the same value */
-		boost_set_msrs(boost_enabled, cpu_online_mask);
+		boost_set_msrs(cpufreq_boost_enabled(), cpu_online_mask);
 
 		register_cpu_notifier(&boost_nb);
 
 		put_online_cpus();
-	} else
-		global_boost.attr.mode = 0444;
-
-	/* We create the boost file in any case, though for systems without
-	 * hardware support it will be read-only and hardwired to return 0.
-	 */
-	if (cpufreq_sysfs_create_file(&(global_boost.attr)))
-		pr_warn(PFX "could not register global boost sysfs file\n");
-	else
-		pr_debug("registered global boost sysfs file\n");
+	}
 }
 
 static void __exit acpi_cpufreq_boost_exit(void)
 {
-	cpufreq_sysfs_remove_file(&(global_boost.attr));
-
 	if (msrs) {
 		unregister_cpu_notifier(&boost_nb);
 
-- 
1.7.10.4