1 // SPDX-License-Identifier: GPL-2.0-or-later
6  *  arch/powerpc/kernel/rtas.c, and arch/powerpc/platforms/pseries/smp.c
17 #define pr_fmt(fmt)     "pseries-hotplug-cpu: " fmt
28 #include <asm/rtas.h>
44  * Record the CPU ids used on each nodes.
45  * Protected by cpu_add_remove_lock.
88 	systemcfg->processorCount--;  in pseries_cpu_disable()
111  * the cpu-offline. Here we wait for long enough to allow the cpu in question
112  * to self-destroy so that the cpu-offline thread can send the CPU_DEAD
115  * OTOH, pseries_cpu_offline_self() is called by the @cpu when it wants to
116  * self-destruct.
144 	paca_ptrs[cpu]->cpu_start = 0;  in pseries_cpu_die()
148  * find_cpu_id_range - found a linear ranger of @nthreads free CPU ids.
161 	int rc = -ENOSPC;  in find_cpu_id_range()
164 		return -ENOMEM;  in find_cpu_id_range()
221 	intserv = of_get_property(np, "ibm,ppc-interrupt-server#s", &len);  in pseries_add_processor()
228 		return -ENOMEM;  in pseries_add_processor()
231 	 * Fetch from the DT nodes read by dlpar_configure_connector() the NUMA  in pseries_add_processor()
264 	/* Record the newly used CPU ids for the associate node. */  in pseries_add_processor()
274 		pr_warn("Reusing free CPU ids %d-%d from another node\n",  in pseries_add_processor()
275 			cpu, cpu + nthreads - 1);  in pseries_add_processor()
293  * the hard id in the paca(s) to -1 to be consistent with boot time
294  * convention for non-present cpus.
303 	intserv = of_get_property(np, "ibm,ppc-interrupt-server#s", &len);  in pseries_remove_processor()
317 			set_hard_smp_processor_id(cpu, -1);  in pseries_remove_processor()
318 			update_numa_cpu_lookup_table(cpu, -1);  in pseries_remove_processor()
336 	intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);  in dlpar_offline_cpu()
338 		return -EINVAL;  in dlpar_offline_cpu()
353 			 * device_offline() will return -EBUSY (via cpu_down()) if there  in dlpar_offline_cpu()
361 				rc = -EBUSY;  in dlpar_offline_cpu()
392 	intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);  in dlpar_online_cpu()
394 		return -EINVAL;  in dlpar_online_cpu()
445 		rc = of_property_read_u32(child, "ibm,my-drc-index",  in dlpar_cpu_exists()
468 	info = of_find_property(parent, "ibm,drc-info", NULL);  in drc_info_valid_index()
474 	/* First value of ibm,drc-info is number of drc-info records */  in drc_info_valid_index()
507 	if (of_property_present(parent, "ibm,drc-info"))  in valid_cpu_drc_index()
510 	/* Note that the format of the ibm,drc-indexes array is  in valid_cpu_drc_index()
511 	 * the number of entries in the array followed by the array  in valid_cpu_drc_index()
518 		rc = of_property_read_u32_index(parent, "ibm,drc-indexes",  in valid_cpu_drc_index()
537 	 * This device node is unattached but may have siblings; open-code the  in pseries_cpuhp_attach_nodes()
540 	for (of_changeset_init(&cs); dn != NULL; dn = dn->sibling) {  in pseries_cpuhp_attach_nodes()
562 		return -ENODEV;  in dlpar_cpu_add()
568 		return -EINVAL;  in dlpar_cpu_add()
574 		return -EINVAL;  in dlpar_cpu_add()
582 		return -EINVAL;  in dlpar_cpu_add()
587 		pr_warn("Failed call to configure-connector, drc index: %x\n",  in dlpar_cpu_add()
591 		return -EINVAL;  in dlpar_cpu_add()
695 		return -EINVAL;  in dlpar_cpu_remove()
730 		rc = of_property_read_u32(dn, "ibm,my-drc-index", &my_index);  in cpu_drc_index_to_dn()
750 		return -ENODEV;  in dlpar_cpu_remove_by_index()
763 	drc_index = be32_to_cpu(hp_elog->_drc_u.drc_index);  in dlpar_cpu()
767 	switch (hp_elog->action) {  in dlpar_cpu()
769 		if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_INDEX) {  in dlpar_cpu()
773 			 * device to UNISOLATE is a no-op, but the hypervisor can  in dlpar_cpu()
780 			rc = -EINVAL;  in dlpar_cpu()
783 		if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_INDEX)  in dlpar_cpu()
786 			rc = -EINVAL;  in dlpar_cpu()
789 		pr_err("Invalid action (%d) specified\n", hp_elog->action);  in dlpar_cpu()
790 		rc = -EINVAL;  in dlpar_cpu()
807 		return -EINVAL;  in dlpar_cpu_probe()
822 		return -EINVAL;  in dlpar_cpu_release()
824 	rc = of_property_read_u32(dn, "ibm,my-drc-index", &drc_index);  in dlpar_cpu_release()
827 		return -EINVAL;  in dlpar_cpu_release()
846 		err = pseries_add_processor(rd->dn);  in pseries_smp_notifier()
849 		pseries_remove_processor(rd->dn);  in pseries_smp_notifier()
868 		printk(KERN_INFO "CPU Hotplug not supported by firmware "  in pseries_cpu_hotplug_init()
869 				"- disabling.\n");  in pseries_cpu_hotplug_init()
873 	smp_ops->cpu_offline_self = pseries_cpu_offline_self;  in pseries_cpu_hotplug_init()
874 	smp_ops->cpu_disable = pseries_cpu_disable;  in pseries_cpu_hotplug_init()
875 	smp_ops->cpu_die = pseries_cpu_die;  in pseries_cpu_hotplug_init()
892 				return -ENOMEM;  in pseries_dlpar_init()