882 lines
19 KiB
C
882 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* pseries CPU Hotplug infrastructure.
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*
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* Split out from arch/powerpc/platforms/pseries/setup.c
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* arch/powerpc/kernel/rtas.c, and arch/powerpc/platforms/pseries/smp.c
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*
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* Peter Bergner, IBM March 2001.
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* Copyright (C) 2001 IBM.
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* Dave Engebretsen, Peter Bergner, and
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* Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
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* Plus various changes from other IBM teams...
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*
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* Copyright (C) 2006 Michael Ellerman, IBM Corporation
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*/
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#define pr_fmt(fmt) "pseries-hotplug-cpu: " fmt
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/sched.h> /* for idle_task_exit */
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#include <linux/sched/hotplug.h>
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#include <linux/cpu.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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#include <asm/firmware.h>
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#include <asm/machdep.h>
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#include <asm/vdso_datapage.h>
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#include <asm/xics.h>
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#include <asm/xive.h>
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#include <asm/plpar_wrappers.h>
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#include <asm/topology.h>
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#include "pseries.h"
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/* This version can't take the spinlock, because it never returns */
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static int rtas_stop_self_token = RTAS_UNKNOWN_SERVICE;
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/*
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* Record the CPU ids used on each nodes.
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* Protected by cpu_add_remove_lock.
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*/
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static cpumask_var_t node_recorded_ids_map[MAX_NUMNODES];
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static void rtas_stop_self(void)
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{
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static struct rtas_args args;
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local_irq_disable();
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BUG_ON(rtas_stop_self_token == RTAS_UNKNOWN_SERVICE);
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rtas_call_unlocked(&args, rtas_stop_self_token, 0, 1, NULL);
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panic("Alas, I survived.\n");
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}
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static void pseries_cpu_offline_self(void)
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{
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unsigned int hwcpu = hard_smp_processor_id();
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local_irq_disable();
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idle_task_exit();
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if (xive_enabled())
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xive_teardown_cpu();
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else
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xics_teardown_cpu();
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unregister_slb_shadow(hwcpu);
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rtas_stop_self();
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/* Should never get here... */
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BUG();
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for(;;);
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}
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static int pseries_cpu_disable(void)
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{
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int cpu = smp_processor_id();
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set_cpu_online(cpu, false);
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vdso_data->processorCount--;
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/*fix boot_cpuid here*/
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if (cpu == boot_cpuid)
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boot_cpuid = cpumask_any(cpu_online_mask);
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/* FIXME: abstract this to not be platform specific later on */
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if (xive_enabled())
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xive_smp_disable_cpu();
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else
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xics_migrate_irqs_away();
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cleanup_cpu_mmu_context();
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return 0;
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}
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/*
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* pseries_cpu_die: Wait for the cpu to die.
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* @cpu: logical processor id of the CPU whose death we're awaiting.
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*
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* This function is called from the context of the thread which is performing
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* the cpu-offline. Here we wait for long enough to allow the cpu in question
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* to self-destroy so that the cpu-offline thread can send the CPU_DEAD
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* notifications.
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*
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* OTOH, pseries_cpu_offline_self() is called by the @cpu when it wants to
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* self-destruct.
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*/
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static void pseries_cpu_die(unsigned int cpu)
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{
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int cpu_status = 1;
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unsigned int pcpu = get_hard_smp_processor_id(cpu);
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unsigned long timeout = jiffies + msecs_to_jiffies(120000);
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while (true) {
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cpu_status = smp_query_cpu_stopped(pcpu);
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if (cpu_status == QCSS_STOPPED ||
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cpu_status == QCSS_HARDWARE_ERROR)
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break;
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if (time_after(jiffies, timeout)) {
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pr_warn("CPU %i (hwid %i) didn't die after 120 seconds\n",
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cpu, pcpu);
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timeout = jiffies + msecs_to_jiffies(120000);
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}
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cond_resched();
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}
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if (cpu_status == QCSS_HARDWARE_ERROR) {
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pr_warn("CPU %i (hwid %i) reported error while dying\n",
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cpu, pcpu);
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}
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paca_ptrs[cpu]->cpu_start = 0;
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}
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/**
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* find_cpu_id_range - found a linear ranger of @nthreads free CPU ids.
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* @nthreads : the number of threads (cpu ids)
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* @assigned_node : the node it belongs to or NUMA_NO_NODE if free ids from any
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* node can be peek.
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* @cpu_mask: the returned CPU mask.
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*
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* Returns 0 on success.
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*/
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static int find_cpu_id_range(unsigned int nthreads, int assigned_node,
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cpumask_var_t *cpu_mask)
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{
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cpumask_var_t candidate_mask;
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unsigned int cpu, node;
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int rc = -ENOSPC;
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if (!zalloc_cpumask_var(&candidate_mask, GFP_KERNEL))
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return -ENOMEM;
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cpumask_clear(*cpu_mask);
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for (cpu = 0; cpu < nthreads; cpu++)
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cpumask_set_cpu(cpu, *cpu_mask);
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BUG_ON(!cpumask_subset(cpu_present_mask, cpu_possible_mask));
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/* Get a bitmap of unoccupied slots. */
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cpumask_xor(candidate_mask, cpu_possible_mask, cpu_present_mask);
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if (assigned_node != NUMA_NO_NODE) {
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/*
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* Remove free ids previously assigned on the other nodes. We
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* can walk only online nodes because once a node became online
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* it is not turned offlined back.
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*/
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for_each_online_node(node) {
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if (node == assigned_node)
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continue;
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cpumask_andnot(candidate_mask, candidate_mask,
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node_recorded_ids_map[node]);
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}
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}
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if (cpumask_empty(candidate_mask))
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goto out;
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while (!cpumask_empty(*cpu_mask)) {
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if (cpumask_subset(*cpu_mask, candidate_mask))
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/* Found a range where we can insert the new cpu(s) */
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break;
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cpumask_shift_left(*cpu_mask, *cpu_mask, nthreads);
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}
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if (!cpumask_empty(*cpu_mask))
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rc = 0;
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out:
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free_cpumask_var(candidate_mask);
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return rc;
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}
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/*
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* Update cpu_present_mask and paca(s) for a new cpu node. The wrinkle
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* here is that a cpu device node may represent multiple logical cpus
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* in the SMT case. We must honor the assumption in other code that
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* the logical ids for sibling SMT threads x and y are adjacent, such
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* that x^1 == y and y^1 == x.
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*/
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static int pseries_add_processor(struct device_node *np)
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{
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int len, nthreads, node, cpu, assigned_node;
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int rc = 0;
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cpumask_var_t cpu_mask;
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const __be32 *intserv;
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intserv = of_get_property(np, "ibm,ppc-interrupt-server#s", &len);
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if (!intserv)
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return 0;
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nthreads = len / sizeof(u32);
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if (!alloc_cpumask_var(&cpu_mask, GFP_KERNEL))
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return -ENOMEM;
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/*
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* Fetch from the DT nodes read by dlpar_configure_connector() the NUMA
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* node id the added CPU belongs to.
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*/
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node = of_node_to_nid(np);
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if (node < 0 || !node_possible(node))
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node = first_online_node;
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BUG_ON(node == NUMA_NO_NODE);
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assigned_node = node;
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cpu_maps_update_begin();
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rc = find_cpu_id_range(nthreads, node, &cpu_mask);
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if (rc && nr_node_ids > 1) {
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/*
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* Try again, considering the free CPU ids from the other node.
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*/
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node = NUMA_NO_NODE;
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rc = find_cpu_id_range(nthreads, NUMA_NO_NODE, &cpu_mask);
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}
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if (rc) {
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pr_err("Cannot add cpu %pOF; this system configuration"
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" supports %d logical cpus.\n", np, num_possible_cpus());
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goto out;
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}
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for_each_cpu(cpu, cpu_mask) {
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BUG_ON(cpu_present(cpu));
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set_cpu_present(cpu, true);
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set_hard_smp_processor_id(cpu, be32_to_cpu(*intserv++));
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}
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/* Record the newly used CPU ids for the associate node. */
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cpumask_or(node_recorded_ids_map[assigned_node],
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node_recorded_ids_map[assigned_node], cpu_mask);
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/*
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* If node is set to NUMA_NO_NODE, CPU ids have be reused from
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* another node, remove them from its mask.
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*/
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if (node == NUMA_NO_NODE) {
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cpu = cpumask_first(cpu_mask);
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pr_warn("Reusing free CPU ids %d-%d from another node\n",
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cpu, cpu + nthreads - 1);
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for_each_online_node(node) {
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if (node == assigned_node)
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continue;
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cpumask_andnot(node_recorded_ids_map[node],
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node_recorded_ids_map[node],
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cpu_mask);
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}
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}
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out:
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cpu_maps_update_done();
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free_cpumask_var(cpu_mask);
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return rc;
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}
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/*
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* Update the present map for a cpu node which is going away, and set
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* the hard id in the paca(s) to -1 to be consistent with boot time
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* convention for non-present cpus.
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*/
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static void pseries_remove_processor(struct device_node *np)
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{
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unsigned int cpu;
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int len, nthreads, i;
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const __be32 *intserv;
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u32 thread;
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intserv = of_get_property(np, "ibm,ppc-interrupt-server#s", &len);
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if (!intserv)
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return;
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nthreads = len / sizeof(u32);
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cpu_maps_update_begin();
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for (i = 0; i < nthreads; i++) {
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thread = be32_to_cpu(intserv[i]);
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for_each_present_cpu(cpu) {
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if (get_hard_smp_processor_id(cpu) != thread)
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continue;
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BUG_ON(cpu_online(cpu));
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set_cpu_present(cpu, false);
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set_hard_smp_processor_id(cpu, -1);
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update_numa_cpu_lookup_table(cpu, -1);
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break;
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}
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if (cpu >= nr_cpu_ids)
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printk(KERN_WARNING "Could not find cpu to remove "
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"with physical id 0x%x\n", thread);
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}
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cpu_maps_update_done();
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}
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static int dlpar_offline_cpu(struct device_node *dn)
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{
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int rc = 0;
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unsigned int cpu;
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int len, nthreads, i;
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const __be32 *intserv;
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u32 thread;
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intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
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if (!intserv)
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return -EINVAL;
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nthreads = len / sizeof(u32);
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cpu_maps_update_begin();
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for (i = 0; i < nthreads; i++) {
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thread = be32_to_cpu(intserv[i]);
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for_each_present_cpu(cpu) {
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if (get_hard_smp_processor_id(cpu) != thread)
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continue;
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if (!cpu_online(cpu))
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break;
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/*
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* device_offline() will return -EBUSY (via cpu_down()) if there
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* is only one CPU left. Check it here to fail earlier and with a
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* more informative error message, while also retaining the
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* cpu_add_remove_lock to be sure that no CPUs are being
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* online/offlined during this check.
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*/
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if (num_online_cpus() == 1) {
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pr_warn("Unable to remove last online CPU %pOFn\n", dn);
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rc = -EBUSY;
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goto out_unlock;
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}
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cpu_maps_update_done();
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rc = device_offline(get_cpu_device(cpu));
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if (rc)
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goto out;
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cpu_maps_update_begin();
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break;
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}
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if (cpu == num_possible_cpus()) {
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pr_warn("Could not find cpu to offline with physical id 0x%x\n",
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thread);
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}
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}
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out_unlock:
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cpu_maps_update_done();
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out:
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return rc;
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}
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static int dlpar_online_cpu(struct device_node *dn)
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{
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int rc = 0;
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unsigned int cpu;
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int len, nthreads, i;
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const __be32 *intserv;
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u32 thread;
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intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
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if (!intserv)
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return -EINVAL;
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nthreads = len / sizeof(u32);
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cpu_maps_update_begin();
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for (i = 0; i < nthreads; i++) {
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thread = be32_to_cpu(intserv[i]);
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for_each_present_cpu(cpu) {
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if (get_hard_smp_processor_id(cpu) != thread)
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continue;
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cpu_maps_update_done();
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find_and_online_cpu_nid(cpu);
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rc = device_online(get_cpu_device(cpu));
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if (rc) {
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dlpar_offline_cpu(dn);
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goto out;
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}
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cpu_maps_update_begin();
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break;
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}
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if (cpu == num_possible_cpus())
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printk(KERN_WARNING "Could not find cpu to online "
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"with physical id 0x%x\n", thread);
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}
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cpu_maps_update_done();
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out:
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return rc;
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}
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static bool dlpar_cpu_exists(struct device_node *parent, u32 drc_index)
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{
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struct device_node *child = NULL;
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u32 my_drc_index;
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bool found;
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int rc;
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/* Assume cpu doesn't exist */
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found = false;
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for_each_child_of_node(parent, child) {
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rc = of_property_read_u32(child, "ibm,my-drc-index",
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&my_drc_index);
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if (rc)
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continue;
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if (my_drc_index == drc_index) {
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of_node_put(child);
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found = true;
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break;
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}
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}
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return found;
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}
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static bool drc_info_valid_index(struct device_node *parent, u32 drc_index)
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{
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struct property *info;
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struct of_drc_info drc;
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const __be32 *value;
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u32 index;
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int count, i, j;
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info = of_find_property(parent, "ibm,drc-info", NULL);
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if (!info)
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return false;
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value = of_prop_next_u32(info, NULL, &count);
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/* First value of ibm,drc-info is number of drc-info records */
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if (value)
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value++;
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else
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return false;
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for (i = 0; i < count; i++) {
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if (of_read_drc_info_cell(&info, &value, &drc))
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return false;
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if (strncmp(drc.drc_type, "CPU", 3))
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break;
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if (drc_index > drc.last_drc_index)
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continue;
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index = drc.drc_index_start;
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for (j = 0; j < drc.num_sequential_elems; j++) {
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if (drc_index == index)
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return true;
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index += drc.sequential_inc;
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}
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}
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return false;
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}
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static bool valid_cpu_drc_index(struct device_node *parent, u32 drc_index)
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{
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bool found = false;
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int rc, index;
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if (of_find_property(parent, "ibm,drc-info", NULL))
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return drc_info_valid_index(parent, drc_index);
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/* Note that the format of the ibm,drc-indexes array is
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* the number of entries in the array followed by the array
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* of drc values so we start looking at index = 1.
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*/
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index = 1;
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while (!found) {
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u32 drc;
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rc = of_property_read_u32_index(parent, "ibm,drc-indexes",
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index++, &drc);
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if (rc)
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break;
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if (drc == drc_index)
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found = true;
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}
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return found;
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}
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static int pseries_cpuhp_attach_nodes(struct device_node *dn)
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{
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struct of_changeset cs;
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int ret;
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/*
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* This device node is unattached but may have siblings; open-code the
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* traversal.
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*/
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for (of_changeset_init(&cs); dn != NULL; dn = dn->sibling) {
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ret = of_changeset_attach_node(&cs, dn);
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if (ret)
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goto out;
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}
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ret = of_changeset_apply(&cs);
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out:
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of_changeset_destroy(&cs);
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return ret;
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}
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static ssize_t dlpar_cpu_add(u32 drc_index)
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{
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|
struct device_node *dn, *parent;
|
|
int rc, saved_rc;
|
|
|
|
pr_debug("Attempting to add CPU, drc index: %x\n", drc_index);
|
|
|
|
parent = of_find_node_by_path("/cpus");
|
|
if (!parent) {
|
|
pr_warn("Failed to find CPU root node \"/cpus\"\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (dlpar_cpu_exists(parent, drc_index)) {
|
|
of_node_put(parent);
|
|
pr_warn("CPU with drc index %x already exists\n", drc_index);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!valid_cpu_drc_index(parent, drc_index)) {
|
|
of_node_put(parent);
|
|
pr_warn("Cannot find CPU (drc index %x) to add.\n", drc_index);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = dlpar_acquire_drc(drc_index);
|
|
if (rc) {
|
|
pr_warn("Failed to acquire DRC, rc: %d, drc index: %x\n",
|
|
rc, drc_index);
|
|
of_node_put(parent);
|
|
return -EINVAL;
|
|
}
|
|
|
|
dn = dlpar_configure_connector(cpu_to_be32(drc_index), parent);
|
|
if (!dn) {
|
|
pr_warn("Failed call to configure-connector, drc index: %x\n",
|
|
drc_index);
|
|
dlpar_release_drc(drc_index);
|
|
of_node_put(parent);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = pseries_cpuhp_attach_nodes(dn);
|
|
|
|
/* Regardless we are done with parent now */
|
|
of_node_put(parent);
|
|
|
|
if (rc) {
|
|
saved_rc = rc;
|
|
pr_warn("Failed to attach node %pOFn, rc: %d, drc index: %x\n",
|
|
dn, rc, drc_index);
|
|
|
|
rc = dlpar_release_drc(drc_index);
|
|
if (!rc)
|
|
dlpar_free_cc_nodes(dn);
|
|
|
|
return saved_rc;
|
|
}
|
|
|
|
update_numa_distance(dn);
|
|
|
|
rc = dlpar_online_cpu(dn);
|
|
if (rc) {
|
|
saved_rc = rc;
|
|
pr_warn("Failed to online cpu %pOFn, rc: %d, drc index: %x\n",
|
|
dn, rc, drc_index);
|
|
|
|
rc = dlpar_detach_node(dn);
|
|
if (!rc)
|
|
dlpar_release_drc(drc_index);
|
|
|
|
return saved_rc;
|
|
}
|
|
|
|
pr_debug("Successfully added CPU %pOFn, drc index: %x\n", dn,
|
|
drc_index);
|
|
return rc;
|
|
}
|
|
|
|
static unsigned int pseries_cpuhp_cache_use_count(const struct device_node *cachedn)
|
|
{
|
|
unsigned int use_count = 0;
|
|
struct device_node *dn;
|
|
|
|
WARN_ON(!of_node_is_type(cachedn, "cache"));
|
|
|
|
for_each_of_cpu_node(dn) {
|
|
if (of_find_next_cache_node(dn) == cachedn)
|
|
use_count++;
|
|
}
|
|
|
|
for_each_node_by_type(dn, "cache") {
|
|
if (of_find_next_cache_node(dn) == cachedn)
|
|
use_count++;
|
|
}
|
|
|
|
return use_count;
|
|
}
|
|
|
|
static int pseries_cpuhp_detach_nodes(struct device_node *cpudn)
|
|
{
|
|
struct device_node *dn;
|
|
struct of_changeset cs;
|
|
int ret = 0;
|
|
|
|
of_changeset_init(&cs);
|
|
ret = of_changeset_detach_node(&cs, cpudn);
|
|
if (ret)
|
|
goto out;
|
|
|
|
dn = cpudn;
|
|
while ((dn = of_find_next_cache_node(dn))) {
|
|
if (pseries_cpuhp_cache_use_count(dn) > 1)
|
|
break;
|
|
|
|
ret = of_changeset_detach_node(&cs, dn);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
ret = of_changeset_apply(&cs);
|
|
out:
|
|
of_changeset_destroy(&cs);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t dlpar_cpu_remove(struct device_node *dn, u32 drc_index)
|
|
{
|
|
int rc;
|
|
|
|
pr_debug("Attempting to remove CPU %pOFn, drc index: %x\n",
|
|
dn, drc_index);
|
|
|
|
rc = dlpar_offline_cpu(dn);
|
|
if (rc) {
|
|
pr_warn("Failed to offline CPU %pOFn, rc: %d\n", dn, rc);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = dlpar_release_drc(drc_index);
|
|
if (rc) {
|
|
pr_warn("Failed to release drc (%x) for CPU %pOFn, rc: %d\n",
|
|
drc_index, dn, rc);
|
|
dlpar_online_cpu(dn);
|
|
return rc;
|
|
}
|
|
|
|
rc = pseries_cpuhp_detach_nodes(dn);
|
|
if (rc) {
|
|
int saved_rc = rc;
|
|
|
|
pr_warn("Failed to detach CPU %pOFn, rc: %d", dn, rc);
|
|
|
|
rc = dlpar_acquire_drc(drc_index);
|
|
if (!rc)
|
|
dlpar_online_cpu(dn);
|
|
|
|
return saved_rc;
|
|
}
|
|
|
|
pr_debug("Successfully removed CPU, drc index: %x\n", drc_index);
|
|
return 0;
|
|
}
|
|
|
|
static struct device_node *cpu_drc_index_to_dn(u32 drc_index)
|
|
{
|
|
struct device_node *dn;
|
|
u32 my_index;
|
|
int rc;
|
|
|
|
for_each_node_by_type(dn, "cpu") {
|
|
rc = of_property_read_u32(dn, "ibm,my-drc-index", &my_index);
|
|
if (rc)
|
|
continue;
|
|
|
|
if (my_index == drc_index)
|
|
break;
|
|
}
|
|
|
|
return dn;
|
|
}
|
|
|
|
static int dlpar_cpu_remove_by_index(u32 drc_index)
|
|
{
|
|
struct device_node *dn;
|
|
int rc;
|
|
|
|
dn = cpu_drc_index_to_dn(drc_index);
|
|
if (!dn) {
|
|
pr_warn("Cannot find CPU (drc index %x) to remove\n",
|
|
drc_index);
|
|
return -ENODEV;
|
|
}
|
|
|
|
rc = dlpar_cpu_remove(dn, drc_index);
|
|
of_node_put(dn);
|
|
return rc;
|
|
}
|
|
|
|
int dlpar_cpu(struct pseries_hp_errorlog *hp_elog)
|
|
{
|
|
u32 drc_index;
|
|
int rc;
|
|
|
|
drc_index = hp_elog->_drc_u.drc_index;
|
|
|
|
lock_device_hotplug();
|
|
|
|
switch (hp_elog->action) {
|
|
case PSERIES_HP_ELOG_ACTION_REMOVE:
|
|
if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_INDEX) {
|
|
rc = dlpar_cpu_remove_by_index(drc_index);
|
|
/*
|
|
* Setting the isolation state of an UNISOLATED/CONFIGURED
|
|
* device to UNISOLATE is a no-op, but the hypervisor can
|
|
* use it as a hint that the CPU removal failed.
|
|
*/
|
|
if (rc)
|
|
dlpar_unisolate_drc(drc_index);
|
|
}
|
|
else
|
|
rc = -EINVAL;
|
|
break;
|
|
case PSERIES_HP_ELOG_ACTION_ADD:
|
|
if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_INDEX)
|
|
rc = dlpar_cpu_add(drc_index);
|
|
else
|
|
rc = -EINVAL;
|
|
break;
|
|
default:
|
|
pr_err("Invalid action (%d) specified\n", hp_elog->action);
|
|
rc = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
unlock_device_hotplug();
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
|
|
|
|
static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
|
|
{
|
|
u32 drc_index;
|
|
int rc;
|
|
|
|
rc = kstrtou32(buf, 0, &drc_index);
|
|
if (rc)
|
|
return -EINVAL;
|
|
|
|
rc = dlpar_cpu_add(drc_index);
|
|
|
|
return rc ? rc : count;
|
|
}
|
|
|
|
static ssize_t dlpar_cpu_release(const char *buf, size_t count)
|
|
{
|
|
struct device_node *dn;
|
|
u32 drc_index;
|
|
int rc;
|
|
|
|
dn = of_find_node_by_path(buf);
|
|
if (!dn)
|
|
return -EINVAL;
|
|
|
|
rc = of_property_read_u32(dn, "ibm,my-drc-index", &drc_index);
|
|
if (rc) {
|
|
of_node_put(dn);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = dlpar_cpu_remove(dn, drc_index);
|
|
of_node_put(dn);
|
|
|
|
return rc ? rc : count;
|
|
}
|
|
|
|
#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
|
|
|
|
static int pseries_smp_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct of_reconfig_data *rd = data;
|
|
int err = 0;
|
|
|
|
switch (action) {
|
|
case OF_RECONFIG_ATTACH_NODE:
|
|
err = pseries_add_processor(rd->dn);
|
|
break;
|
|
case OF_RECONFIG_DETACH_NODE:
|
|
pseries_remove_processor(rd->dn);
|
|
break;
|
|
}
|
|
return notifier_from_errno(err);
|
|
}
|
|
|
|
static struct notifier_block pseries_smp_nb = {
|
|
.notifier_call = pseries_smp_notifier,
|
|
};
|
|
|
|
static int __init pseries_cpu_hotplug_init(void)
|
|
{
|
|
int qcss_tok;
|
|
unsigned int node;
|
|
|
|
#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
|
|
ppc_md.cpu_probe = dlpar_cpu_probe;
|
|
ppc_md.cpu_release = dlpar_cpu_release;
|
|
#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
|
|
|
|
rtas_stop_self_token = rtas_token("stop-self");
|
|
qcss_tok = rtas_token("query-cpu-stopped-state");
|
|
|
|
if (rtas_stop_self_token == RTAS_UNKNOWN_SERVICE ||
|
|
qcss_tok == RTAS_UNKNOWN_SERVICE) {
|
|
printk(KERN_INFO "CPU Hotplug not supported by firmware "
|
|
"- disabling.\n");
|
|
return 0;
|
|
}
|
|
|
|
smp_ops->cpu_offline_self = pseries_cpu_offline_self;
|
|
smp_ops->cpu_disable = pseries_cpu_disable;
|
|
smp_ops->cpu_die = pseries_cpu_die;
|
|
|
|
/* Processors can be added/removed only on LPAR */
|
|
if (firmware_has_feature(FW_FEATURE_LPAR)) {
|
|
for_each_node(node) {
|
|
if (!alloc_cpumask_var_node(&node_recorded_ids_map[node],
|
|
GFP_KERNEL, node))
|
|
return -ENOMEM;
|
|
|
|
/* Record ids of CPU added at boot time */
|
|
cpumask_copy(node_recorded_ids_map[node],
|
|
cpumask_of_node(node));
|
|
}
|
|
|
|
of_reconfig_notifier_register(&pseries_smp_nb);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
machine_arch_initcall(pseries, pseries_cpu_hotplug_init);
|