[PATCH v7 2/7] cpufreq:acpi:x86: Adjust the acpi-cpufreq.c code to work with common boost solution

Lukasz Majewski
2013-08-13T10:08:20Z

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
callback.

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

---
Changes for v7:
- Remove superfluous acpi_cpufreq_driver.boost_supported = false at
acpi_cpufreq_boost_init()

Changes for v6:
- Perform acpi_cpufreq_boost_init initialization before cpufreq_driver
registration
- Compile store_boost() only when CONFIG_X86_ACPI_CPUFREQ_CPB defined
- Use boost_enabled flag defined at acpi_cpufreq_driver to store information
about boost state
- Instead of using cpufreq_set_boost_enabled(), modify the boost_enable in
the acpi driver code

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 | 86 ++++++++++++++--------------------------
1 file changed, 29 insertions(+), 57 deletions(-)

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 9b5d1b1..4400b89 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)
@@ -133,49 +132,16 @@ 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;
-
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");

- 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);
+ return 0;
}

-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);
@@ -186,15 +152,32 @@ static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
cpufreq_freq_attr_ro(freqdomain_cpus);

#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
+static ssize_t store_boost(const char *buf, size_t count)
+{
+ int ret;
+ unsigned long val = 0;
+
+ if (!acpi_cpufreq_driver.boost_supported)
+ return -EINVAL;
+
+ ret = kstrtoul(buf, 10, &val);
+ if (ret || (val > 1))
+ return -EINVAL;
+
+ _store_boost((int) val);
+
+ return count;
+}
+
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_enabled);
}

static struct freq_attr cpb = __ATTR(cpb, 0644, show_cpb, store_cpb);
@@ -582,7 +565,7 @@ 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_enabled, cpumask);
break;

case CPU_DOWN_PREPARE:
@@ -937,6 +920,7 @@ static struct cpufreq_driver acpi_cpufreq_driver = {
.resume = acpi_cpufreq_resume,
.name = "acpi-cpufreq",
.attr = acpi_cpufreq_attr,
+ .set_boost = _store_boost,
};

static void __init acpi_cpufreq_boost_init(void)
@@ -947,33 +931,22 @@ static void __init acpi_cpufreq_boost_init(void)
if (!msrs)
return;

- boost_supported = true;
- boost_enabled = boost_state(0);
-
+ acpi_cpufreq_driver.boost_supported = true;
+ acpi_cpufreq_driver.boost_enabled = 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_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);

@@ -1015,12 +988,11 @@ static int __init acpi_cpufreq_init(void)
*iter = &cpb;
}
#endif
+ acpi_cpufreq_boost_init();

ret = cpufreq_register_driver(&acpi_cpufreq_driver);
if (ret)
free_acpi_perf_data();
- else
- acpi_cpufreq_boost_init();

return ret;
}
--
1.7.10.4