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soc: qcom: msm_perf: Optionally compile out hotplug tunables

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If msm_performance module and some other module with the
core hotplug capability (like core_ctl) co-exist and
both of them try to hotplug the cores system inconsistencies
can occur. To avoid such behavior sysfs nodes needed for hotplug
support in msm_performance module are compiled out.

Change-Id: I25e8404ce0581e718d6b55cd0e1f5c7da8e92db5
Signed-off-by: Prachee Ramsinghani <pracheer@codeaurora.org>
This commit is contained in:
Prachee Ramsinghani 2015-03-12 18:09:11 +05:30 • committed by David Keitel
parent ad20b57ffb
commit 010aa5bd7c
2 changed files with 16 additions and 2 deletions
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10
drivers/soc/qcom/Kconfig
View file

@ -475,6 +475,16 @@ config MSM_PERFORMANCE
It ensures that no more than a user specified number of CPUs stay
online at any given point in time.
config MSM_PERFORMANCE_HOTPLUG_ON
bool "Hotplug functionality through msm_performance turned on"
depends on MSM_PERFORMANCE
default y
help
If some other core-control driver is present turn off the core-control
capability of msm_performance driver. Setting this flag to false will
compile out the nodes needed for core-control functionality through
msm_performance.
endif # ARCH_QCOM
config MSM_SUBSYSTEM_RESTART

8
drivers/soc/qcom/msm_performance.c
View file

@ -204,7 +204,9 @@ static const struct kernel_param_ops param_ops_max_cpus = {
.get = get_max_cpus,
};
#ifdef CONFIG_MSM_PERFORMANCE_HOTPLUG_ON
device_param_cb(max_cpus, &param_ops_max_cpus, NULL, 0644);
#endif
static int set_managed_cpus(const char *buf, const struct kernel_param *kp)
{
@ -287,9 +289,11 @@ static int get_managed_online_cpus(char *buf, const struct kernel_param *kp)
static const struct kernel_param_ops param_ops_managed_online_cpus = {
.get = get_managed_online_cpus,
};
device_param_cb(managed_online_cpus, &param_ops_managed_online_cpus,
NULL, 0444);
#ifdef CONFIG_MSM_PERFORMANCE_HOTPLUG_ON
device_param_cb(managed_online_cpus, &param_ops_managed_online_cpus,
NULL, 0444);
#endif
/*
* Userspace sends cpu#:min_freq_value to vote for min_freq_value as the new
* scaling_min. To withdraw its vote it needs to enter cpu#:0