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sched/walt: wait for cpufreq policies

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walt_update_cluster_topology requires the availability
of the cpufreq policies.  These are not available
immediately after insmoding walt, and this causes a
crash through SCHED_BUG_ON.

Register for the cpufreq notifier for POLICY creation,
and init the second half of walt init after the
policy creation for all cpus.

Change-Id: If1af62a4991f3226bd0b661f5a5e419ceea3817a
Signed-off-by: Stephen Dickey <dickey@codeaurora.org>
This commit is contained in:
Stephen Dickey 2021-01-19 15:55:31 -08:00 committed by Rishabh Bhatnagar
parent 0390d12e5d
commit 43cd57a2f2
1 changed files with 49 additions and 1 deletions
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50
kernel/sched/walt/walt.c
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@ -4149,11 +4149,15 @@ static int walt_init_stop_handler(void *data)
return 0;
}
static int walt_module_init(void)
static void walt_init(void)
{
struct ctl_table_header *hdr;
static atomic_t already_inited = ATOMIC_INIT(0);
int i;
if (atomic_cmpxchg(&already_inited, 0, 1))
return;
walt_tunables();
sched_init_ops();
@ -4179,6 +4183,50 @@ static int walt_module_init(void)
i = match_string(sched_feat_names, __SCHED_FEAT_NR, "TTWU_QUEUE");
static_key_disable_cpuslocked(&sched_feat_keys[i]);
sysctl_sched_features &= ~(1UL << i);
}
static bool are_cpufreq_policies_available(void)
{
int cpu;
for_each_possible_cpu(cpu) {
if (!cpufreq_cpu_get_raw(cpu))
return false;
}
return true;
}
struct work_struct walt_cpufreq_policy_work;
static int walt_cpufreq_notifier_cb(struct notifier_block *nb,
unsigned long action,
void *data)
{
if (are_cpufreq_policies_available())
schedule_work(&walt_cpufreq_policy_work);
return 0;
}
static struct notifier_block walt_cpufreq_notifier_block = {
.notifier_call = walt_cpufreq_notifier_cb
};
static void walt_wq_cpufreq_policy_update(struct work_struct *work)
{
walt_init();
cpufreq_unregister_notifier(&walt_cpufreq_notifier_block, CPUFREQ_POLICY_NOTIFIER);
}
static int walt_module_init(void)
{
INIT_WORK(&walt_cpufreq_policy_work, walt_wq_cpufreq_policy_update);
cpufreq_register_notifier(&walt_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
if (are_cpufreq_policies_available())
walt_init();
return 0;
}