1 // SPDX-License-Identifier: GPL-2.0-or-later
22 #include <linux/cpu.h>
42 #include <asm/text-patching.h>
49  * The Primary thread of each non-boot processor was started from the OF client
54 /* Query where a cpu is now.  Return codes #defined in plpar_wrappers.h */
62 			"Firmware doesn't support query-cpu-stopped-state\n");  in smp_query_cpu_stopped()
69 		       "RTAS query-cpu-stopped-state failed: %i\n", status);  in smp_query_cpu_stopped()
77  * smp_startup_cpu() - start the given cpu
84  *	0	- failure
85  *	1	- success
101 	/* Check to see if the CPU out of FW already for kexec */  in smp_startup_cpu()
108 	 * If the RTAS start-cpu token does not exist then presume the  in smp_startup_cpu()
109 	 * cpu is already spinning.  in smp_startup_cpu()
117 		printk(KERN_ERR "start-cpu failed: %i\n", status);  in smp_startup_cpu()
124 static void smp_setup_cpu(int cpu)  in smp_setup_cpu()  argument
128 	else if (cpu != boot_cpuid)  in smp_setup_cpu()
132 		vpa_init(cpu);  in smp_setup_cpu()
134 	cpumask_clear_cpu(cpu, of_spin_mask);  in smp_setup_cpu()
137 static int smp_pSeries_kick_cpu(int nr)  in smp_pSeries_kick_cpu()  argument
139 	if (nr < 0 || nr >= nr_cpu_ids)  in smp_pSeries_kick_cpu()
140 		return -EINVAL;  in smp_pSeries_kick_cpu()
142 	if (!smp_startup_cpu(nr))  in smp_pSeries_kick_cpu()
143 		return -ENOENT;  in smp_pSeries_kick_cpu()
147 	 * cpu_start field to become non-zero After we set cpu_start,  in smp_pSeries_kick_cpu()
150 	paca_ptrs[nr]->cpu_start = 1;  in smp_pSeries_kick_cpu()
155 static int pseries_smp_prepare_cpu(int cpu)  in pseries_smp_prepare_cpu()  argument
158 		return xive_smp_prepare_cpu(cpu);  in pseries_smp_prepare_cpu()
163 static void (*ic_cause_ipi)(int cpu) __ro_after_init;
166 static void dbell_or_ic_cause_ipi(int cpu)  in dbell_or_ic_cause_ipi()  argument
168 	if (doorbell_try_core_ipi(cpu))  in dbell_or_ic_cause_ipi()
171 	ic_cause_ipi(cpu);  in dbell_or_ic_cause_ipi()
174 static int pseries_cause_nmi_ipi(int cpu)  in pseries_cause_nmi_ipi()  argument
178 	if (cpu == NMI_IPI_ALL_OTHERS) {  in pseries_cause_nmi_ipi()
181 		if (cpu < 0) {  in pseries_cause_nmi_ipi()
182 			WARN_ONCE(true, "incorrect cpu parameter %d", cpu);  in pseries_cause_nmi_ipi()
186 		hwcpu = get_hard_smp_processor_id(cpu);  in pseries_cause_nmi_ipi()
238 	ic_cause_ipi = smp_ops->cause_ipi;  in pSeries_smp_probe()
239 	smp_ops->cause_ipi = dbell_or_ic_cause_ipi;  in pSeries_smp_probe()
258 	pr_debug(" -> smp_init_pSeries()\n");  in smp_init_pseries()
267 	 * query-cpu-stopped-state.  in smp_init_pseries()
281 	pr_debug(" <- smp_init_pSeries()\n");  in smp_init_pseries()