155190f88SBenjamin Herrenschmidt /* 255190f88SBenjamin Herrenschmidt * SMP support for PowerNV machines. 355190f88SBenjamin Herrenschmidt * 455190f88SBenjamin Herrenschmidt * Copyright 2011 IBM Corp. 555190f88SBenjamin Herrenschmidt * 655190f88SBenjamin Herrenschmidt * This program is free software; you can redistribute it and/or 755190f88SBenjamin Herrenschmidt * modify it under the terms of the GNU General Public License 855190f88SBenjamin Herrenschmidt * as published by the Free Software Foundation; either version 955190f88SBenjamin Herrenschmidt * 2 of the License, or (at your option) any later version. 1055190f88SBenjamin Herrenschmidt */ 1155190f88SBenjamin Herrenschmidt 1255190f88SBenjamin Herrenschmidt #include <linux/kernel.h> 1355190f88SBenjamin Herrenschmidt #include <linux/module.h> 1455190f88SBenjamin Herrenschmidt #include <linux/sched.h> 15ef8bd77fSIngo Molnar #include <linux/sched/hotplug.h> 1655190f88SBenjamin Herrenschmidt #include <linux/smp.h> 1755190f88SBenjamin Herrenschmidt #include <linux/interrupt.h> 1855190f88SBenjamin Herrenschmidt #include <linux/delay.h> 1955190f88SBenjamin Herrenschmidt #include <linux/init.h> 2055190f88SBenjamin Herrenschmidt #include <linux/spinlock.h> 2155190f88SBenjamin Herrenschmidt #include <linux/cpu.h> 2255190f88SBenjamin Herrenschmidt 2355190f88SBenjamin Herrenschmidt #include <asm/irq.h> 2455190f88SBenjamin Herrenschmidt #include <asm/smp.h> 2555190f88SBenjamin Herrenschmidt #include <asm/paca.h> 2655190f88SBenjamin Herrenschmidt #include <asm/machdep.h> 2755190f88SBenjamin Herrenschmidt #include <asm/cputable.h> 2855190f88SBenjamin Herrenschmidt #include <asm/firmware.h> 2955190f88SBenjamin Herrenschmidt #include <asm/vdso_datapage.h> 3055190f88SBenjamin Herrenschmidt #include <asm/cputhreads.h> 3155190f88SBenjamin Herrenschmidt #include <asm/xics.h> 32243e2511SBenjamin Herrenschmidt #include <asm/xive.h> 3314a43e69SBenjamin Herrenschmidt #include <asm/opal.h> 34f2038911SPreeti U Murthy #include <asm/runlatch.h> 352751b628SAnton Blanchard #include <asm/code-patching.h> 36d4e58e59SMichael Neuling #include <asm/dbell.h> 37755563bcSPaul Mackerras #include <asm/kvm_ppc.h> 38755563bcSPaul Mackerras #include <asm/ppc-opcode.h> 39a7cd88daSGautham R. Shenoy #include <asm/cpuidle.h> 404145f358SBalbir Singh #include <asm/kexec.h> 414145f358SBalbir Singh #include <asm/reg.h> 4255190f88SBenjamin Herrenschmidt 4355190f88SBenjamin Herrenschmidt #include "powernv.h" 4455190f88SBenjamin Herrenschmidt 45344eb010SBenjamin Herrenschmidt #ifdef DEBUG 46344eb010SBenjamin Herrenschmidt #include <asm/udbg.h> 47344eb010SBenjamin Herrenschmidt #define DBG(fmt...) udbg_printf(fmt) 48344eb010SBenjamin Herrenschmidt #else 49344eb010SBenjamin Herrenschmidt #define DBG(fmt...) 50344eb010SBenjamin Herrenschmidt #endif 51344eb010SBenjamin Herrenschmidt 52061d19f2SPaul Gortmaker static void pnv_smp_setup_cpu(int cpu) 5355190f88SBenjamin Herrenschmidt { 545080332cSMichael Neuling /* 555080332cSMichael Neuling * P9 workaround for CI vector load (see traps.c), 565080332cSMichael Neuling * enable the corresponding HMI interrupt 575080332cSMichael Neuling */ 585080332cSMichael Neuling if (pvr_version_is(PVR_POWER9)) 595080332cSMichael Neuling mtspr(SPRN_HMEER, mfspr(SPRN_HMEER) | PPC_BIT(17)); 605080332cSMichael Neuling 61243e2511SBenjamin Herrenschmidt if (xive_enabled()) 62243e2511SBenjamin Herrenschmidt xive_smp_setup_cpu(); 63243e2511SBenjamin Herrenschmidt else if (cpu != boot_cpuid) 6455190f88SBenjamin Herrenschmidt xics_setup_cpu(); 6555190f88SBenjamin Herrenschmidt } 6655190f88SBenjamin Herrenschmidt 67e51df2c1SAnton Blanchard static int pnv_smp_kick_cpu(int nr) 6814a43e69SBenjamin Herrenschmidt { 6976d98ab4SSantosh Sivaraj unsigned int pcpu; 702751b628SAnton Blanchard unsigned long start_here = 712751b628SAnton Blanchard __pa(ppc_function_entry(generic_secondary_smp_init)); 7214a43e69SBenjamin Herrenschmidt long rc; 73e4d54f71SStewart Smith uint8_t status; 7414a43e69SBenjamin Herrenschmidt 75c642af9cSSantosh Sivaraj if (nr < 0 || nr >= nr_cpu_ids) 76f8d0d5dcSSantosh Sivaraj return -EINVAL; 7714a43e69SBenjamin Herrenschmidt 7876d98ab4SSantosh Sivaraj pcpu = get_hard_smp_processor_id(nr); 79b2b48584SBenjamin Herrenschmidt /* 80e4d54f71SStewart Smith * If we already started or OPAL is not supported, we just 81b2b48584SBenjamin Herrenschmidt * kick the CPU via the PACA 8214a43e69SBenjamin Herrenschmidt */ 83d2e60075SNicholas Piggin if (paca_ptrs[nr]->cpu_start || !firmware_has_feature(FW_FEATURE_OPAL)) 84b2b48584SBenjamin Herrenschmidt goto kick; 85b2b48584SBenjamin Herrenschmidt 86b2b48584SBenjamin Herrenschmidt /* 87b2b48584SBenjamin Herrenschmidt * At this point, the CPU can either be spinning on the way in 88b2b48584SBenjamin Herrenschmidt * from kexec or be inside OPAL waiting to be started for the 89b2b48584SBenjamin Herrenschmidt * first time. OPAL v3 allows us to query OPAL to know if it 90b2b48584SBenjamin Herrenschmidt * has the CPUs, so we do that 91b2b48584SBenjamin Herrenschmidt */ 92b2b48584SBenjamin Herrenschmidt rc = opal_query_cpu_status(pcpu, &status); 93b2b48584SBenjamin Herrenschmidt if (rc != OPAL_SUCCESS) { 94e4d54f71SStewart Smith pr_warn("OPAL Error %ld querying CPU %d state\n", rc, nr); 95b2b48584SBenjamin Herrenschmidt return -ENODEV; 96b2b48584SBenjamin Herrenschmidt } 97b2b48584SBenjamin Herrenschmidt 98b2b48584SBenjamin Herrenschmidt /* 99b2b48584SBenjamin Herrenschmidt * Already started, just kick it, probably coming from 100b2b48584SBenjamin Herrenschmidt * kexec and spinning 101b2b48584SBenjamin Herrenschmidt */ 102b2b48584SBenjamin Herrenschmidt if (status == OPAL_THREAD_STARTED) 103b2b48584SBenjamin Herrenschmidt goto kick; 104b2b48584SBenjamin Herrenschmidt 105b2b48584SBenjamin Herrenschmidt /* 106b2b48584SBenjamin Herrenschmidt * Available/inactive, let's kick it 107b2b48584SBenjamin Herrenschmidt */ 108b2b48584SBenjamin Herrenschmidt if (status == OPAL_THREAD_INACTIVE) { 109e4d54f71SStewart Smith pr_devel("OPAL: Starting CPU %d (HW 0x%x)...\n", nr, pcpu); 11014a43e69SBenjamin Herrenschmidt rc = opal_start_cpu(pcpu, start_here); 1114ea9008bSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS) { 112e4d54f71SStewart Smith pr_warn("OPAL Error %ld starting CPU %d\n", rc, nr); 1134ea9008bSBenjamin Herrenschmidt return -ENODEV; 1144ea9008bSBenjamin Herrenschmidt } 115b2b48584SBenjamin Herrenschmidt } else { 116b2b48584SBenjamin Herrenschmidt /* 117b2b48584SBenjamin Herrenschmidt * An unavailable CPU (or any other unknown status) 118b2b48584SBenjamin Herrenschmidt * shouldn't be started. It should also 119b2b48584SBenjamin Herrenschmidt * not be in the possible map but currently it can 120b2b48584SBenjamin Herrenschmidt * happen 121b2b48584SBenjamin Herrenschmidt */ 122b2b48584SBenjamin Herrenschmidt pr_devel("OPAL: CPU %d (HW 0x%x) is unavailable" 123b2b48584SBenjamin Herrenschmidt " (status %d)...\n", nr, pcpu, status); 124b2b48584SBenjamin Herrenschmidt return -ENODEV; 12514a43e69SBenjamin Herrenschmidt } 126e4d54f71SStewart Smith 127b2b48584SBenjamin Herrenschmidt kick: 12814a43e69SBenjamin Herrenschmidt return smp_generic_kick_cpu(nr); 12914a43e69SBenjamin Herrenschmidt } 13014a43e69SBenjamin Herrenschmidt 131344eb010SBenjamin Herrenschmidt #ifdef CONFIG_HOTPLUG_CPU 132344eb010SBenjamin Herrenschmidt 133344eb010SBenjamin Herrenschmidt static int pnv_smp_cpu_disable(void) 134344eb010SBenjamin Herrenschmidt { 135344eb010SBenjamin Herrenschmidt int cpu = smp_processor_id(); 136344eb010SBenjamin Herrenschmidt 137344eb010SBenjamin Herrenschmidt /* This is identical to pSeries... might consolidate by 138344eb010SBenjamin Herrenschmidt * moving migrate_irqs_away to a ppc_md with default to 139344eb010SBenjamin Herrenschmidt * the generic fixup_irqs. --BenH. 140344eb010SBenjamin Herrenschmidt */ 141344eb010SBenjamin Herrenschmidt set_cpu_online(cpu, false); 142344eb010SBenjamin Herrenschmidt vdso_data->processorCount--; 143344eb010SBenjamin Herrenschmidt if (cpu == boot_cpuid) 144344eb010SBenjamin Herrenschmidt boot_cpuid = cpumask_any(cpu_online_mask); 145243e2511SBenjamin Herrenschmidt if (xive_enabled()) 146243e2511SBenjamin Herrenschmidt xive_smp_disable_cpu(); 147243e2511SBenjamin Herrenschmidt else 148344eb010SBenjamin Herrenschmidt xics_migrate_irqs_away(); 149344eb010SBenjamin Herrenschmidt return 0; 150344eb010SBenjamin Herrenschmidt } 151344eb010SBenjamin Herrenschmidt 152344eb010SBenjamin Herrenschmidt static void pnv_smp_cpu_kill_self(void) 153344eb010SBenjamin Herrenschmidt { 154344eb010SBenjamin Herrenschmidt unsigned int cpu; 155755563bcSPaul Mackerras unsigned long srr1, wmask; 156344eb010SBenjamin Herrenschmidt 157344eb010SBenjamin Herrenschmidt /* Standard hot unplug procedure */ 1582525db04SNicholas Piggin /* 1592525db04SNicholas Piggin * This hard disables local interurpts, ensuring we have no lazy 1602525db04SNicholas Piggin * irqs pending. 1612525db04SNicholas Piggin */ 1622525db04SNicholas Piggin WARN_ON(irqs_disabled()); 1632525db04SNicholas Piggin hard_irq_disable(); 1642525db04SNicholas Piggin WARN_ON(lazy_irq_pending()); 1652525db04SNicholas Piggin 166344eb010SBenjamin Herrenschmidt idle_task_exit(); 167344eb010SBenjamin Herrenschmidt current->active_mm = NULL; /* for sanity */ 168344eb010SBenjamin Herrenschmidt cpu = smp_processor_id(); 169344eb010SBenjamin Herrenschmidt DBG("CPU%d offline\n", cpu); 170344eb010SBenjamin Herrenschmidt generic_set_cpu_dead(cpu); 171344eb010SBenjamin Herrenschmidt smp_wmb(); 172344eb010SBenjamin Herrenschmidt 173755563bcSPaul Mackerras wmask = SRR1_WAKEMASK; 174755563bcSPaul Mackerras if (cpu_has_feature(CPU_FTR_ARCH_207S)) 175755563bcSPaul Mackerras wmask = SRR1_WAKEMASK_P8; 176755563bcSPaul Mackerras 177344eb010SBenjamin Herrenschmidt while (!generic_check_cpu_restart(cpu)) { 17853c656c4SPaul Mackerras /* 17953c656c4SPaul Mackerras * Clear IPI flag, since we don't handle IPIs while 18053c656c4SPaul Mackerras * offline, except for those when changing micro-threading 18153c656c4SPaul Mackerras * mode, which are handled explicitly below, and those 18253c656c4SPaul Mackerras * for coming online, which are handled via 18353c656c4SPaul Mackerras * generic_check_cpu_restart() calls. 18453c656c4SPaul Mackerras */ 18553c656c4SPaul Mackerras kvmppc_set_host_ipi(cpu, 0); 18677b54e9fSShreyas B. Prabhu 187a7cd88daSGautham R. Shenoy srr1 = pnv_cpu_offline(cpu); 188e2186023SMichael Ellerman 1892525db04SNicholas Piggin WARN_ON(lazy_irq_pending()); 1902525db04SNicholas Piggin 19156548fc0SPaul Mackerras /* 19256548fc0SPaul Mackerras * If the SRR1 value indicates that we woke up due to 19356548fc0SPaul Mackerras * an external interrupt, then clear the interrupt. 19456548fc0SPaul Mackerras * We clear the interrupt before checking for the 19556548fc0SPaul Mackerras * reason, so as to avoid a race where we wake up for 19656548fc0SPaul Mackerras * some other reason, find nothing and clear the interrupt 19756548fc0SPaul Mackerras * just as some other cpu is sending us an interrupt. 19856548fc0SPaul Mackerras * If we returned from power7_nap as a result of 19956548fc0SPaul Mackerras * having finished executing in a KVM guest, then srr1 20056548fc0SPaul Mackerras * contains 0. 20156548fc0SPaul Mackerras */ 20253c656c4SPaul Mackerras if (((srr1 & wmask) == SRR1_WAKEEE) || 2032525db04SNicholas Piggin ((srr1 & wmask) == SRR1_WAKEHVI)) { 204243e2511SBenjamin Herrenschmidt if (cpu_has_feature(CPU_FTR_ARCH_300)) { 205243e2511SBenjamin Herrenschmidt if (xive_enabled()) 206243e2511SBenjamin Herrenschmidt xive_flush_interrupt(); 2079b256714SBenjamin Herrenschmidt else 208243e2511SBenjamin Herrenschmidt icp_opal_flush_interrupt(); 209243e2511SBenjamin Herrenschmidt } else 210d6a4f709SPaul Mackerras icp_native_flush_interrupt(); 211755563bcSPaul Mackerras } else if ((srr1 & wmask) == SRR1_WAKEHDBELL) { 212755563bcSPaul Mackerras unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); 213755563bcSPaul Mackerras asm volatile(PPC_MSGCLR(%0) : : "r" (msg)); 2144145f358SBalbir Singh } else if ((srr1 & wmask) == SRR1_WAKERESET) { 2154145f358SBalbir Singh irq_set_pending_from_srr1(srr1); 2164145f358SBalbir Singh /* Does not return */ 21756548fc0SPaul Mackerras } 2184145f358SBalbir Singh 21953c656c4SPaul Mackerras smp_mb(); 220e2186023SMichael Ellerman 2214145f358SBalbir Singh /* 2224145f358SBalbir Singh * For kdump kernels, we process the ipi and jump to 2234145f358SBalbir Singh * crash_ipi_callback 2244145f358SBalbir Singh */ 2254145f358SBalbir Singh if (kdump_in_progress()) { 2264145f358SBalbir Singh /* 2274145f358SBalbir Singh * If we got to this point, we've not used 2284145f358SBalbir Singh * NMI's, otherwise we would have gone 2294145f358SBalbir Singh * via the SRR1_WAKERESET path. We are 2304145f358SBalbir Singh * using regular IPI's for waking up offline 2314145f358SBalbir Singh * threads. 2324145f358SBalbir Singh */ 2334145f358SBalbir Singh struct pt_regs regs; 2344145f358SBalbir Singh 2354145f358SBalbir Singh ppc_save_regs(®s); 2364145f358SBalbir Singh crash_ipi_callback(®s); 2374145f358SBalbir Singh /* Does not return */ 2384145f358SBalbir Singh } 2394145f358SBalbir Singh 240e2186023SMichael Ellerman if (cpu_core_split_required()) 241e2186023SMichael Ellerman continue; 242e2186023SMichael Ellerman 24353c656c4SPaul Mackerras if (srr1 && !generic_check_cpu_restart(cpu)) 2442525db04SNicholas Piggin DBG("CPU%d Unexpected exit while offline srr1=%lx!\n", 2452525db04SNicholas Piggin cpu, srr1); 2462525db04SNicholas Piggin 247344eb010SBenjamin Herrenschmidt } 2489b256714SBenjamin Herrenschmidt 249344eb010SBenjamin Herrenschmidt DBG("CPU%d coming online...\n", cpu); 250344eb010SBenjamin Herrenschmidt } 251344eb010SBenjamin Herrenschmidt 252344eb010SBenjamin Herrenschmidt #endif /* CONFIG_HOTPLUG_CPU */ 253344eb010SBenjamin Herrenschmidt 254d70a54e2SGreg Kurz static int pnv_cpu_bootable(unsigned int nr) 255d70a54e2SGreg Kurz { 256d70a54e2SGreg Kurz /* 257d70a54e2SGreg Kurz * Starting with POWER8, the subcore logic relies on all threads of a 258d70a54e2SGreg Kurz * core being booted so that they can participate in split mode 259d70a54e2SGreg Kurz * switches. So on those machines we ignore the smt_enabled_at_boot 260d70a54e2SGreg Kurz * setting (smt-enabled on the kernel command line). 261d70a54e2SGreg Kurz */ 262d70a54e2SGreg Kurz if (cpu_has_feature(CPU_FTR_ARCH_207S)) 263d70a54e2SGreg Kurz return 1; 264d70a54e2SGreg Kurz 265d70a54e2SGreg Kurz return smp_generic_cpu_bootable(nr); 266d70a54e2SGreg Kurz } 267d70a54e2SGreg Kurz 268243e2511SBenjamin Herrenschmidt static int pnv_smp_prepare_cpu(int cpu) 269243e2511SBenjamin Herrenschmidt { 270243e2511SBenjamin Herrenschmidt if (xive_enabled()) 271243e2511SBenjamin Herrenschmidt return xive_smp_prepare_cpu(cpu); 272243e2511SBenjamin Herrenschmidt return 0; 273243e2511SBenjamin Herrenschmidt } 274243e2511SBenjamin Herrenschmidt 27545b21cfeSMichael Ellerman /* Cause IPI as setup by the interrupt controller (xics or xive) */ 27645b21cfeSMichael Ellerman static void (*ic_cause_ipi)(int cpu); 27745b21cfeSMichael Ellerman 278b866cc21SNicholas Piggin static void pnv_cause_ipi(int cpu) 279b866cc21SNicholas Piggin { 280b866cc21SNicholas Piggin if (doorbell_try_core_ipi(cpu)) 281b866cc21SNicholas Piggin return; 282b866cc21SNicholas Piggin 28345b21cfeSMichael Ellerman ic_cause_ipi(cpu); 284b866cc21SNicholas Piggin } 285b866cc21SNicholas Piggin 2866b3edefeSNicholas Piggin static void pnv_p9_dd1_cause_ipi(int cpu) 2876b3edefeSNicholas Piggin { 2886b3edefeSNicholas Piggin int this_cpu = get_cpu(); 2896b3edefeSNicholas Piggin 2906b3edefeSNicholas Piggin /* 2916b3edefeSNicholas Piggin * POWER9 DD1 has a global addressed msgsnd, but for now we restrict 2926b3edefeSNicholas Piggin * IPIs to same core, because it requires additional synchronization 2936b3edefeSNicholas Piggin * for inter-core doorbells which we do not implement. 2946b3edefeSNicholas Piggin */ 2956b3edefeSNicholas Piggin if (cpumask_test_cpu(cpu, cpu_sibling_mask(this_cpu))) 2966b3edefeSNicholas Piggin doorbell_global_ipi(cpu); 2976b3edefeSNicholas Piggin else 29845b21cfeSMichael Ellerman ic_cause_ipi(cpu); 2996b3edefeSNicholas Piggin 3006b3edefeSNicholas Piggin put_cpu(); 3016b3edefeSNicholas Piggin } 3026b3edefeSNicholas Piggin 303243e2511SBenjamin Herrenschmidt static void __init pnv_smp_probe(void) 304243e2511SBenjamin Herrenschmidt { 305243e2511SBenjamin Herrenschmidt if (xive_enabled()) 306243e2511SBenjamin Herrenschmidt xive_smp_probe(); 307243e2511SBenjamin Herrenschmidt else 308243e2511SBenjamin Herrenschmidt xics_smp_probe(); 309b866cc21SNicholas Piggin 3106b3edefeSNicholas Piggin if (cpu_has_feature(CPU_FTR_DBELL)) { 31145b21cfeSMichael Ellerman ic_cause_ipi = smp_ops->cause_ipi; 31245b21cfeSMichael Ellerman WARN_ON(!ic_cause_ipi); 31345b21cfeSMichael Ellerman 3146b3edefeSNicholas Piggin if (cpu_has_feature(CPU_FTR_ARCH_300)) { 3156b3edefeSNicholas Piggin if (cpu_has_feature(CPU_FTR_POWER9_DD1)) 3166b3edefeSNicholas Piggin smp_ops->cause_ipi = pnv_p9_dd1_cause_ipi; 3176b3edefeSNicholas Piggin else 3186b3edefeSNicholas Piggin smp_ops->cause_ipi = doorbell_global_ipi; 3196b3edefeSNicholas Piggin } else { 320b866cc21SNicholas Piggin smp_ops->cause_ipi = pnv_cause_ipi; 3216b3edefeSNicholas Piggin } 322b866cc21SNicholas Piggin } 323243e2511SBenjamin Herrenschmidt } 324243e2511SBenjamin Herrenschmidt 325e36d0a2eSNicholas Piggin static int pnv_system_reset_exception(struct pt_regs *regs) 326e36d0a2eSNicholas Piggin { 327e36d0a2eSNicholas Piggin if (smp_handle_nmi_ipi(regs)) 328e36d0a2eSNicholas Piggin return 1; 329e36d0a2eSNicholas Piggin return 0; 330e36d0a2eSNicholas Piggin } 331e36d0a2eSNicholas Piggin 332e36d0a2eSNicholas Piggin static int pnv_cause_nmi_ipi(int cpu) 333e36d0a2eSNicholas Piggin { 334e36d0a2eSNicholas Piggin int64_t rc; 335e36d0a2eSNicholas Piggin 336e36d0a2eSNicholas Piggin if (cpu >= 0) { 337ee03b9b4SNicholas Piggin int h = get_hard_smp_processor_id(cpu); 338ee03b9b4SNicholas Piggin 339ee03b9b4SNicholas Piggin if (opal_check_token(OPAL_QUIESCE)) 340ee03b9b4SNicholas Piggin opal_quiesce(QUIESCE_HOLD, h); 341ee03b9b4SNicholas Piggin 342ee03b9b4SNicholas Piggin rc = opal_signal_system_reset(h); 343ee03b9b4SNicholas Piggin 344ee03b9b4SNicholas Piggin if (opal_check_token(OPAL_QUIESCE)) 345ee03b9b4SNicholas Piggin opal_quiesce(QUIESCE_RESUME, h); 346ee03b9b4SNicholas Piggin 347e36d0a2eSNicholas Piggin if (rc != OPAL_SUCCESS) 348e36d0a2eSNicholas Piggin return 0; 349e36d0a2eSNicholas Piggin return 1; 350e36d0a2eSNicholas Piggin 351e36d0a2eSNicholas Piggin } else if (cpu == NMI_IPI_ALL_OTHERS) { 352e36d0a2eSNicholas Piggin bool success = true; 353e36d0a2eSNicholas Piggin int c; 354e36d0a2eSNicholas Piggin 355ee03b9b4SNicholas Piggin if (opal_check_token(OPAL_QUIESCE)) 356ee03b9b4SNicholas Piggin opal_quiesce(QUIESCE_HOLD, -1); 357e36d0a2eSNicholas Piggin 358e36d0a2eSNicholas Piggin /* 359e36d0a2eSNicholas Piggin * We do not use broadcasts (yet), because it's not clear 360e36d0a2eSNicholas Piggin * exactly what semantics Linux wants or the firmware should 361e36d0a2eSNicholas Piggin * provide. 362e36d0a2eSNicholas Piggin */ 363e36d0a2eSNicholas Piggin for_each_online_cpu(c) { 364e36d0a2eSNicholas Piggin if (c == smp_processor_id()) 365e36d0a2eSNicholas Piggin continue; 366e36d0a2eSNicholas Piggin 367e36d0a2eSNicholas Piggin rc = opal_signal_system_reset( 368e36d0a2eSNicholas Piggin get_hard_smp_processor_id(c)); 369e36d0a2eSNicholas Piggin if (rc != OPAL_SUCCESS) 370e36d0a2eSNicholas Piggin success = false; 371e36d0a2eSNicholas Piggin } 372ee03b9b4SNicholas Piggin 373ee03b9b4SNicholas Piggin if (opal_check_token(OPAL_QUIESCE)) 374ee03b9b4SNicholas Piggin opal_quiesce(QUIESCE_RESUME, -1); 375ee03b9b4SNicholas Piggin 376e36d0a2eSNicholas Piggin if (success) 377e36d0a2eSNicholas Piggin return 1; 378e36d0a2eSNicholas Piggin 379e36d0a2eSNicholas Piggin /* 380e36d0a2eSNicholas Piggin * Caller will fall back to doorbells, which may pick 381e36d0a2eSNicholas Piggin * up the remainders. 382e36d0a2eSNicholas Piggin */ 383e36d0a2eSNicholas Piggin } 384e36d0a2eSNicholas Piggin 385e36d0a2eSNicholas Piggin return 0; 386e36d0a2eSNicholas Piggin } 387e36d0a2eSNicholas Piggin 38855190f88SBenjamin Herrenschmidt static struct smp_ops_t pnv_smp_ops = { 389b866cc21SNicholas Piggin .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */ 390b866cc21SNicholas Piggin .cause_ipi = NULL, /* Filled at runtime by pnv_smp_probe() */ 391c64af645SNicholas Piggin .cause_nmi_ipi = NULL, 392243e2511SBenjamin Herrenschmidt .probe = pnv_smp_probe, 393243e2511SBenjamin Herrenschmidt .prepare_cpu = pnv_smp_prepare_cpu, 39414a43e69SBenjamin Herrenschmidt .kick_cpu = pnv_smp_kick_cpu, 39555190f88SBenjamin Herrenschmidt .setup_cpu = pnv_smp_setup_cpu, 396d70a54e2SGreg Kurz .cpu_bootable = pnv_cpu_bootable, 397344eb010SBenjamin Herrenschmidt #ifdef CONFIG_HOTPLUG_CPU 398344eb010SBenjamin Herrenschmidt .cpu_disable = pnv_smp_cpu_disable, 399344eb010SBenjamin Herrenschmidt .cpu_die = generic_cpu_die, 400344eb010SBenjamin Herrenschmidt #endif /* CONFIG_HOTPLUG_CPU */ 40155190f88SBenjamin Herrenschmidt }; 40255190f88SBenjamin Herrenschmidt 40355190f88SBenjamin Herrenschmidt /* This is called very early during platform setup_arch */ 40455190f88SBenjamin Herrenschmidt void __init pnv_smp_init(void) 40555190f88SBenjamin Herrenschmidt { 406e36d0a2eSNicholas Piggin if (opal_check_token(OPAL_SIGNAL_SYSTEM_RESET)) { 407e36d0a2eSNicholas Piggin ppc_md.system_reset_exception = pnv_system_reset_exception; 408e36d0a2eSNicholas Piggin pnv_smp_ops.cause_nmi_ipi = pnv_cause_nmi_ipi; 409e36d0a2eSNicholas Piggin } 41055190f88SBenjamin Herrenschmidt smp_ops = &pnv_smp_ops; 41155190f88SBenjamin Herrenschmidt 412344eb010SBenjamin Herrenschmidt #ifdef CONFIG_HOTPLUG_CPU 413344eb010SBenjamin Herrenschmidt ppc_md.cpu_die = pnv_smp_cpu_kill_self; 4144145f358SBalbir Singh #ifdef CONFIG_KEXEC_CORE 4154145f358SBalbir Singh crash_wake_offline = 1; 4164145f358SBalbir Singh #endif 417344eb010SBenjamin Herrenschmidt #endif 41855190f88SBenjamin Herrenschmidt } 419