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sched: walt: use the is_cpu_allowed tracehook to restrict cpus

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is_cpu_allowed is critical to select_fallback_rq, select_task_rq,
and __migrate_task, to ensure that only valid cpus are chosen for
the execution of a task.

Register for the trace hook, and restrict cpus selected by is_cpu_allowed
to non-halted cpus.

Change-Id: I72b2e90230603a8f97ce1da7014d72c0ebdee97e
Signed-off-by: Stephen Dickey <quic_dickey@quicinc.com>
This commit is contained in:
Stephen Dickey 2022-01-10 14:17:03 -08:00 committed by Rishabh Bhatnagar
parent 4d68dcf27d
commit dcc31fca0c
1 changed files with 11 additions and 1 deletions
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12
kernel/sched/walt/walt.c
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@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2016-2022, The Linux Foundation. All rights reserved.
* Copyright (c) 2016-2021, The Linux Foundation. All rights reserved.
* Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <linux/syscore_ops.h>
@ -4244,6 +4245,14 @@ static void android_rvh_rto_next_cpu(void *unused,
}
}
static void android_rvh_is_cpu_allowed(void *unused, int cpu, bool *allowed)
{
if (unlikely(walt_disabled))
return;
*allowed = !cpumask_test_cpu(cpu, cpu_halt_mask);
}
static void register_walt_hooks(void)
{
register_trace_android_rvh_wake_up_new_task(android_rvh_wake_up_new_task, NULL);
@ -4274,6 +4283,7 @@ static void register_walt_hooks(void)
register_trace_android_rvh_set_cpus_allowed_ptr_locked(
android_rvh_set_cpus_allowed_ptr_locked, NULL);
register_trace_android_rvh_rto_next_cpu(android_rvh_rto_next_cpu, NULL);
register_trace_android_rvh_is_cpu_allowed(android_rvh_is_cpu_allowed, NULL);
}
atomic64_t walt_irq_work_lastq_ws;