hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IC30P1 -------------------------------- In case that L2 msc components lose configure context after entering cpuidle powerdown state, refuse to enter powerdown state since L2 msc specified by user. When resctrl fs is released from kernel, MPAM driver would restore all MSC partition with default values and enable cpuidle powerdown state again. Signed-off-by: Zeng Heng <zengheng4@huawei.com> --- arch/arm64/kernel/mpam.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/mpam.c b/arch/arm64/kernel/mpam.c index d3ac3bfb5564..3f070cbab420 100644 --- a/arch/arm64/kernel/mpam.c +++ b/arch/arm64/kernel/mpam.c @@ -8,6 +8,7 @@ #include <linux/jump_label.h> #include <linux/percpu.h> #include <linux/crash_dump.h> +#include <linux/resctrl.h> DEFINE_STATIC_KEY_FALSE(arm64_mpam_has_hcr); DEFINE_STATIC_KEY_FALSE(mpam_enabled); @@ -18,9 +19,21 @@ static int mpam_pm_notifier(struct notifier_block *self, unsigned long cmd, void *v) { u64 regval; - int cpu = smp_processor_id(); + struct rdt_resource *r; + int i, cpu = smp_processor_id(); switch (cmd) { + case CPU_PM_ENTER: + if (!resctrl_mounted) + return NOTIFY_OK; + + for (i = 0; i < RDT_NUM_RESOURCES; i++) { + r = resctrl_arch_get_resource(i); + if (!r->invisible && r->is_volatile) + return NOTIFY_BAD; + } + + return NOTIFY_OK; case CPU_PM_EXIT: /* * Don't use mpam_thread_switch() as the system register -- 2.25.1