[PATCH v2 2/3] cpufreq:acpi:x86: Adjust the acpi-cpufreq.c code to work with common boost solution

Lukasz Majewski
2013-06-11T09:03:27Z

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.
Global flags (boost_enabled and boost_supported) were replaced with boost_en
flag and low_level_boost pointer presence at cpufreq driver structure.

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

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

---
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 | 72 +++++++++++++++-------------------------
1 file changed, 26 insertions(+), 46 deletions(-)

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 11b8b4b..a15c999 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -80,7 +80,6 @@ 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)
@@ -133,20 +132,11 @@ 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)
{
- int ret;
- unsigned long val = 0;
-
- if (!boost_supported)
- return -EINVAL;
-
- ret = kstrtoul(buf, 10, &val);
- if (ret || (val > 1))
- return -EINVAL;
-
- if ((val && boost_enabled) || (!val && !boost_enabled))
- return count;
+ if ((val && acpi_cpufreq_driver.boost_en) ||
+ (!val && !acpi_cpufreq_driver.boost_en))
+ return 0;

get_online_cpus();

@@ -154,38 +144,39 @@ static ssize_t _store_boost(const char *buf, size_t count)

put_online_cpus();

- boost_enabled = val;
+ acpi_cpufreq_driver.boost_en = val;
pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis");

- return count;
+ return 0;
}

-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)
{
- return _store_boost(buf, count);
-}
+ int ret;
+ unsigned long val = 0;

-static ssize_t show_global_boost(struct kobject *kobj,
- struct attribute *attr, char *buf)
-{
- return sprintf(buf, "%u\n", boost_enabled);
-}
+ if (!acpi_cpufreq_driver.low_level_boost)
+ return -EINVAL;
+
+ ret = kstrtoul(buf, 10, &val);
+ if (ret || (val > 1))
+ return -EINVAL;

-static struct global_attr global_boost = __ATTR(boost, 0644,
- show_global_boost,
- store_global_boost);
+ _store_boost((int) val);
+
+ return count;
+}

#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);
+ 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", acpi_cpufreq_driver.boost_en);
}

static struct freq_attr cpb = __ATTR(cpb, 0644, show_cpb, store_cpb);
@@ -571,7 +562,7 @@ 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(acpi_cpufreq_driver.boost_en, cpumask);
break;

case CPU_DOWN_PREPARE:
@@ -930,33 +921,22 @@ static void __init acpi_cpufreq_boost_init(void)
if (!msrs)
return;

- boost_supported = true;
- boost_enabled = boost_state(0);
+ acpi_cpufreq_driver.low_level_boost = &_store_boost;
+ acpi_cpufreq_driver.boost_en = boost_state(0);

get_online_cpus();

/* Force all MSRs to the same value */
- boost_set_msrs(boost_enabled, cpu_online_mask);
+ boost_set_msrs(acpi_cpufreq_driver.boost_en, 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 (sysfs_create_file(cpufreq_global_kobject, &(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)
{
- sysfs_remove_file(cpufreq_global_kobject, &(global_boost.attr));
-
if (msrs) {
unregister_cpu_notifier(&boost_nb);

--
1.7.10.4