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| author | Mahesh Sivasubramanian <msivasub@codeaurora.org> | 2014-09-18 20:33:55 -0600 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-22 11:16:19 -0700 |
| commit | d0aebd3840defccb664c1628970be6c00957166a (patch) | |
| tree | 31cf7f6a854432d9c9b935ac3ada44b51193cbbb /arch/arm64/kernel | |
| parent | ee5580ee55c8e787a227076c8c6bbc77f63aa8cf (diff) | |
ARM64: smp: Prevent cluster LPM modes when pending IPIs on cluster CPUs
LPM modes can fail if there is a pending IPI interrupt at GIC CPU
interface. On some usecases frequent failure of LPM modes can
cause power and performance degradation. Hence, prevent cluster
low power modes when there is a pending IPI on cluster CPUs.
Change-Id: Id8a0ac24e4867ef824e0a6f11d989f1e1a2b0e93
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>
[satyap: trivial merge conflict resolution]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/smp.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 6afe10641a93..08e78e47be95 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -484,6 +484,16 @@ acpi_parse_gic_cpu_interface(struct acpi_subtable_header *header, void (*__smp_cross_call)(const struct cpumask *, unsigned int); DEFINE_PER_CPU(bool, pending_ipi); +void smp_cross_call_common(const struct cpumask *cpumask, unsigned int func) +{ + unsigned int cpu; + + for_each_cpu(cpu, cpumask) + per_cpu(pending_ipi, cpu) = true; + + __smp_cross_call(cpumask, func); +} + /* * Enumerate the possible CPU set from the device tree and build the * cpu logical map array containing MPIDR values related to logical @@ -683,17 +693,17 @@ u64 smp_irq_stat_cpu(unsigned int cpu) void arch_send_call_function_ipi_mask(const struct cpumask *mask) { - smp_cross_call(mask, IPI_CALL_FUNC); + smp_cross_call_common(mask, IPI_CALL_FUNC); } void arch_send_call_function_single_ipi(int cpu) { - smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC); + smp_cross_call_common(cpumask_of(cpu), IPI_CALL_FUNC); } void arch_send_wakeup_ipi_mask(const struct cpumask *mask) { - smp_cross_call(mask, IPI_WAKEUP); + smp_cross_call_common(mask, IPI_WAKEUP); } #ifdef CONFIG_IRQ_WORK @@ -759,7 +769,7 @@ static void smp_send_all_cpu_backtrace(void) pr_info("\nsending IPI to all other CPUs:\n"); if (!cpumask_empty(&backtrace_mask)) - smp_cross_call(&backtrace_mask, IPI_CPU_BACKTRACE); + smp_cross_call_common(&backtrace_mask, IPI_CPU_BACKTRACE); /* Wait for up to 10 seconds for all other CPUs to do the backtrace */ for (i = 0; i < 10 * 1000; i++) { @@ -867,13 +877,13 @@ void handle_IPI(int ipinr, struct pt_regs *regs) void smp_send_reschedule(int cpu) { BUG_ON(cpu_is_offline(cpu)); - smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE); + smp_cross_call_common(cpumask_of(cpu), IPI_RESCHEDULE); } #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST void tick_broadcast(const struct cpumask *mask) { - smp_cross_call(mask, IPI_TIMER); + smp_cross_call_common(mask, IPI_TIMER); } #endif @@ -887,7 +897,7 @@ void smp_send_stop(void) cpumask_copy(&mask, cpu_online_mask); cpumask_clear_cpu(smp_processor_id(), &mask); - smp_cross_call(&mask, IPI_CPU_STOP); + smp_cross_call_common(&mask, IPI_CPU_STOP); } /* Wait up to one second for other CPUs to stop */ |