2  * pseries CPU Hotplug infrastructure.
25 #include <linux/cpu.h>
69 enum cpu_state_vals get_cpu_current_state(int cpu)  in get_cpu_current_state()  argument
71 	return per_cpu(current_state, cpu);  in get_cpu_current_state()
74 void set_cpu_current_state(int cpu, enum cpu_state_vals state)  in set_cpu_current_state()  argument
76 	per_cpu(current_state, cpu) = state;  in set_cpu_current_state()
79 enum cpu_state_vals get_preferred_offline_state(int cpu)  in get_preferred_offline_state()  argument
81 	return per_cpu(preferred_offline_state, cpu);  in get_preferred_offline_state()
84 void set_preferred_offline_state(int cpu, enum cpu_state_vals state)  in set_preferred_offline_state()  argument
86 	per_cpu(preferred_offline_state, cpu) = state;  in set_preferred_offline_state()
89 void set_default_offline_state(int cpu)  in set_default_offline_state()  argument
91 	per_cpu(preferred_offline_state, cpu) = default_offline_state;  in set_default_offline_state()
102 	printk("cpu %u (hwid %u) Ready to die...\n",  in rtas_stop_self()
111 	unsigned int cpu = smp_processor_id();  in pseries_mach_cpu_die()  local
119 	if (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) {  in pseries_mach_cpu_die()
120 		set_cpu_current_state(cpu, CPU_STATE_INACTIVE);  in pseries_mach_cpu_die()
130 		while (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) {  in pseries_mach_cpu_die()
138 		if (get_preferred_offline_state(cpu) == CPU_STATE_ONLINE) {  in pseries_mach_cpu_die()
151 	WARN_ON(get_preferred_offline_state(cpu) != CPU_STATE_OFFLINE);  in pseries_mach_cpu_die()
153 	set_cpu_current_state(cpu, CPU_STATE_OFFLINE);  in pseries_mach_cpu_die()
164 	int cpu = smp_processor_id();  in pseries_cpu_disable()  local
166 	set_cpu_online(cpu, false);  in pseries_cpu_disable()
170 	if (cpu == boot_cpuid)  in pseries_cpu_disable()
179  * pseries_cpu_die: Wait for the cpu to die.
180  * @cpu: logical processor id of the CPU whose death we're awaiting.
183  * the cpu-offline. Here we wait for long enough to allow the cpu in question
184  * to self-destroy so that the cpu-offline thread can send the CPU_DEAD
187  * OTOH, pseries_mach_cpu_die() is called by the @cpu when it wants to
190 static void pseries_cpu_die(unsigned int cpu)  in pseries_cpu_die()  argument
194 	unsigned int pcpu = get_hard_smp_processor_id(cpu);  in pseries_cpu_die()
196 	if (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) {  in pseries_cpu_die()
199 			if (get_cpu_current_state(cpu) == CPU_STATE_INACTIVE) {  in pseries_cpu_die()
205 	} else if (get_preferred_offline_state(cpu) == CPU_STATE_OFFLINE) {  in pseries_cpu_die()
217 		printk("Querying DEAD? cpu %i (%i) shows %i\n",  in pseries_cpu_die()
218 		       cpu, pcpu, cpu_status);  in pseries_cpu_die()
226 	paca[cpu].cpu_start = 0;  in pseries_cpu_die()
230  * Update cpu_present_mask and paca(s) for a new cpu node.  The wrinkle
231  * here is that a cpu device node may represent up to two logical cpus
238 	unsigned int cpu;  in pseries_add_processor()  local
264 		printk(KERN_ERR "Cannot add cpu %s; this system configuration"  in pseries_add_processor()
272 			/* Found a range where we can insert the new cpu(s) */  in pseries_add_processor()
284 	for_each_cpu(cpu, tmp) {  in pseries_add_processor()
285 		BUG_ON(cpu_present(cpu));  in pseries_add_processor()
286 		set_cpu_present(cpu, true);  in pseries_add_processor()
287 		set_hard_smp_processor_id(cpu, *intserv++);  in pseries_add_processor()
298  * Update the present map for a cpu node which is going away, and set
304 	unsigned int cpu;  in pseries_remove_processor()  local
316 		for_each_present_cpu(cpu) {  in pseries_remove_processor()
317 			if (get_hard_smp_processor_id(cpu) != intserv[i])  in pseries_remove_processor()
319 			BUG_ON(cpu_online(cpu));  in pseries_remove_processor()
320 			set_cpu_present(cpu, false);  in pseries_remove_processor()
321 			set_hard_smp_processor_id(cpu, -1);  in pseries_remove_processor()
324 		if (cpu >= nr_cpu_ids)  in pseries_remove_processor()
325 			printk(KERN_WARNING "Could not find cpu to remove "  in pseries_remove_processor()
373 	int cpu;  in pseries_cpu_hotplug_init()  local
381 			printk(KERN_INFO "CPU Hotplug not supported on "  in pseries_cpu_hotplug_init()
388 	qcss_tok = rtas_token("query-cpu-stopped-state");  in pseries_cpu_hotplug_init()
392 		printk(KERN_INFO "CPU Hotplug not supported by firmware "  in pseries_cpu_hotplug_init()
407 			for_each_online_cpu(cpu)  in pseries_cpu_hotplug_init()
408 				set_default_offline_state(cpu);  in pseries_cpu_hotplug_init()