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arm64: debug: convert OS lock CPU hotplug notifier to new infrastructure
The arm64 debug monitor initialisation code uses a CPU hotplug notifier to clear the OS lock when CPUs come online. This patch converts the code to the new hotplug mechanism. Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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2 changed files with 7 additions and 24 deletions
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@ -132,36 +132,18 @@ NOKPROBE_SYMBOL(disable_debug_monitors);
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/*
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* OS lock clearing.
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*/
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static void clear_os_lock(void *unused)
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static int clear_os_lock(unsigned int cpu)
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{
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asm volatile("msr oslar_el1, %0" : : "r" (0));
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isb();
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return 0;
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}
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static int os_lock_notify(struct notifier_block *self,
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unsigned long action, void *data)
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{
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if ((action & ~CPU_TASKS_FROZEN) == CPU_ONLINE)
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clear_os_lock(NULL);
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return NOTIFY_OK;
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}
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static struct notifier_block os_lock_nb = {
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.notifier_call = os_lock_notify,
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};
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static int debug_monitors_init(void)
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{
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cpu_notifier_register_begin();
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/* Clear the OS lock. */
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on_each_cpu(clear_os_lock, NULL, 1);
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isb();
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/* Register hotplug handler. */
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__register_cpu_notifier(&os_lock_nb);
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cpu_notifier_register_done();
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return 0;
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return cpuhp_setup_state(CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
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"CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING",
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clear_os_lock, NULL);
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}
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postcore_initcall(debug_monitors_init);
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@ -45,6 +45,7 @@ enum cpuhp_state {
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CPUHP_AP_PERF_METAG_STARTING,
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CPUHP_AP_MIPS_OP_LOONGSON3_STARTING,
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CPUHP_AP_ARM_VFP_STARTING,
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CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
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CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING,
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CPUHP_AP_PERF_ARM_STARTING,
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CPUHP_AP_ARM_L2X0_STARTING,
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