1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __CPUHOTPLUG_H 3 #define __CPUHOTPLUG_H 4 5 #include <linux/types.h> 6 7 /* 8 * CPU-up CPU-down 9 * 10 * BP AP BP AP 11 * 12 * OFFLINE OFFLINE 13 * | ^ 14 * v | 15 * BRINGUP_CPU->AP_OFFLINE BRINGUP_CPU <- AP_IDLE_DEAD (idle thread/play_dead) 16 * | AP_OFFLINE 17 * v (IRQ-off) ,---------------^ 18 * AP_ONLNE | (stop_machine) 19 * | TEARDOWN_CPU <- AP_ONLINE_IDLE 20 * | ^ 21 * v | 22 * AP_ACTIVE AP_ACTIVE 23 */ 24 25 enum cpuhp_state { 26 CPUHP_INVALID = -1, 27 CPUHP_OFFLINE = 0, 28 CPUHP_CREATE_THREADS, 29 CPUHP_PERF_PREPARE, 30 CPUHP_PERF_X86_PREPARE, 31 CPUHP_PERF_X86_AMD_UNCORE_PREP, 32 CPUHP_PERF_POWER, 33 CPUHP_PERF_SUPERH, 34 CPUHP_X86_HPET_DEAD, 35 CPUHP_X86_APB_DEAD, 36 CPUHP_X86_MCE_DEAD, 37 CPUHP_VIRT_NET_DEAD, 38 CPUHP_SLUB_DEAD, 39 CPUHP_MM_WRITEBACK_DEAD, 40 CPUHP_MM_VMSTAT_DEAD, 41 CPUHP_SOFTIRQ_DEAD, 42 CPUHP_NET_MVNETA_DEAD, 43 CPUHP_CPUIDLE_DEAD, 44 CPUHP_ARM64_FPSIMD_DEAD, 45 CPUHP_ARM_OMAP_WAKE_DEAD, 46 CPUHP_IRQ_POLL_DEAD, 47 CPUHP_BLOCK_SOFTIRQ_DEAD, 48 CPUHP_ACPI_CPUDRV_DEAD, 49 CPUHP_S390_PFAULT_DEAD, 50 CPUHP_BLK_MQ_DEAD, 51 CPUHP_FS_BUFF_DEAD, 52 CPUHP_PRINTK_DEAD, 53 CPUHP_MM_MEMCQ_DEAD, 54 CPUHP_PERCPU_CNT_DEAD, 55 CPUHP_RADIX_DEAD, 56 CPUHP_PAGE_ALLOC_DEAD, 57 CPUHP_NET_DEV_DEAD, 58 CPUHP_PCI_XGENE_DEAD, 59 CPUHP_IOMMU_INTEL_DEAD, 60 CPUHP_LUSTRE_CFS_DEAD, 61 CPUHP_AP_ARM_CACHE_B15_RAC_DEAD, 62 CPUHP_PADATA_DEAD, 63 CPUHP_WORKQUEUE_PREP, 64 CPUHP_POWER_NUMA_PREPARE, 65 CPUHP_HRTIMERS_PREPARE, 66 CPUHP_PROFILE_PREPARE, 67 CPUHP_X2APIC_PREPARE, 68 CPUHP_SMPCFD_PREPARE, 69 CPUHP_RELAY_PREPARE, 70 CPUHP_SLAB_PREPARE, 71 CPUHP_MD_RAID5_PREPARE, 72 CPUHP_RCUTREE_PREP, 73 CPUHP_CPUIDLE_COUPLED_PREPARE, 74 CPUHP_POWERPC_PMAC_PREPARE, 75 CPUHP_POWERPC_MMU_CTX_PREPARE, 76 CPUHP_XEN_PREPARE, 77 CPUHP_XEN_EVTCHN_PREPARE, 78 CPUHP_ARM_SHMOBILE_SCU_PREPARE, 79 CPUHP_SH_SH3X_PREPARE, 80 CPUHP_NET_FLOW_PREPARE, 81 CPUHP_TOPOLOGY_PREPARE, 82 CPUHP_NET_IUCV_PREPARE, 83 CPUHP_ARM_BL_PREPARE, 84 CPUHP_TRACE_RB_PREPARE, 85 CPUHP_MM_ZS_PREPARE, 86 CPUHP_MM_ZSWP_MEM_PREPARE, 87 CPUHP_MM_ZSWP_POOL_PREPARE, 88 CPUHP_KVM_PPC_BOOK3S_PREPARE, 89 CPUHP_ZCOMP_PREPARE, 90 CPUHP_TIMERS_PREPARE, 91 CPUHP_MIPS_SOC_PREPARE, 92 CPUHP_BP_PREPARE_DYN, 93 CPUHP_BP_PREPARE_DYN_END = CPUHP_BP_PREPARE_DYN + 20, 94 CPUHP_BRINGUP_CPU, 95 CPUHP_AP_IDLE_DEAD, 96 CPUHP_AP_OFFLINE, 97 CPUHP_AP_SCHED_STARTING, 98 CPUHP_AP_RCUTREE_DYING, 99 CPUHP_AP_CPU_PM_STARTING, 100 CPUHP_AP_IRQ_GIC_STARTING, 101 CPUHP_AP_IRQ_HIP04_STARTING, 102 CPUHP_AP_IRQ_ARMADA_XP_STARTING, 103 CPUHP_AP_IRQ_BCM2836_STARTING, 104 CPUHP_AP_IRQ_MIPS_GIC_STARTING, 105 CPUHP_AP_IRQ_RISCV_STARTING, 106 CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING, 107 CPUHP_AP_ARM_MVEBU_COHERENCY, 108 CPUHP_AP_MICROCODE_LOADER, 109 CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING, 110 CPUHP_AP_PERF_X86_STARTING, 111 CPUHP_AP_PERF_X86_AMD_IBS_STARTING, 112 CPUHP_AP_PERF_X86_CQM_STARTING, 113 CPUHP_AP_PERF_X86_CSTATE_STARTING, 114 CPUHP_AP_PERF_XTENSA_STARTING, 115 CPUHP_AP_MIPS_OP_LOONGSON3_STARTING, 116 CPUHP_AP_ARM_SDEI_STARTING, 117 CPUHP_AP_ARM_VFP_STARTING, 118 CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING, 119 CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING, 120 CPUHP_AP_PERF_ARM_ACPI_STARTING, 121 CPUHP_AP_PERF_ARM_STARTING, 122 CPUHP_AP_ARM_L2X0_STARTING, 123 CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING, 124 CPUHP_AP_ARM_ARCH_TIMER_STARTING, 125 CPUHP_AP_ARM_GLOBAL_TIMER_STARTING, 126 CPUHP_AP_JCORE_TIMER_STARTING, 127 CPUHP_AP_ARM_TWD_STARTING, 128 CPUHP_AP_QCOM_TIMER_STARTING, 129 CPUHP_AP_TEGRA_TIMER_STARTING, 130 CPUHP_AP_ARMADA_TIMER_STARTING, 131 CPUHP_AP_MARCO_TIMER_STARTING, 132 CPUHP_AP_MIPS_GIC_TIMER_STARTING, 133 CPUHP_AP_ARC_TIMER_STARTING, 134 CPUHP_AP_RISCV_TIMER_STARTING, 135 CPUHP_AP_CSKY_TIMER_STARTING, 136 CPUHP_AP_HYPERV_TIMER_STARTING, 137 CPUHP_AP_KVM_STARTING, 138 CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING, 139 CPUHP_AP_KVM_ARM_VGIC_STARTING, 140 CPUHP_AP_KVM_ARM_TIMER_STARTING, 141 /* Must be the last timer callback */ 142 CPUHP_AP_DUMMY_TIMER_STARTING, 143 CPUHP_AP_ARM_XEN_STARTING, 144 CPUHP_AP_ARM_KVMPV_STARTING, 145 CPUHP_AP_ARM_CORESIGHT_STARTING, 146 CPUHP_AP_ARM_CORESIGHT_CTI_STARTING, 147 CPUHP_AP_ARM64_ISNDEP_STARTING, 148 CPUHP_AP_SMPCFD_DYING, 149 CPUHP_AP_X86_TBOOT_DYING, 150 CPUHP_AP_ARM_CACHE_B15_RAC_DYING, 151 CPUHP_AP_ONLINE, 152 CPUHP_TEARDOWN_CPU, 153 CPUHP_AP_ONLINE_IDLE, 154 CPUHP_AP_SMPBOOT_THREADS, 155 CPUHP_AP_X86_VDSO_VMA_ONLINE, 156 CPUHP_AP_IRQ_AFFINITY_ONLINE, 157 CPUHP_AP_BLK_MQ_ONLINE, 158 CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS, 159 CPUHP_AP_X86_INTEL_EPB_ONLINE, 160 CPUHP_AP_PERF_ONLINE, 161 CPUHP_AP_PERF_X86_ONLINE, 162 CPUHP_AP_PERF_X86_UNCORE_ONLINE, 163 CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE, 164 CPUHP_AP_PERF_X86_AMD_POWER_ONLINE, 165 CPUHP_AP_PERF_X86_RAPL_ONLINE, 166 CPUHP_AP_PERF_X86_CQM_ONLINE, 167 CPUHP_AP_PERF_X86_CSTATE_ONLINE, 168 CPUHP_AP_PERF_S390_CF_ONLINE, 169 CPUHP_AP_PERF_S390_SF_ONLINE, 170 CPUHP_AP_PERF_ARM_CCI_ONLINE, 171 CPUHP_AP_PERF_ARM_CCN_ONLINE, 172 CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE, 173 CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE, 174 CPUHP_AP_PERF_ARM_HISI_L3_ONLINE, 175 CPUHP_AP_PERF_ARM_L2X0_ONLINE, 176 CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE, 177 CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE, 178 CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE, 179 CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE, 180 CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE, 181 CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE, 182 CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE, 183 CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE, 184 CPUHP_AP_WATCHDOG_ONLINE, 185 CPUHP_AP_WORKQUEUE_ONLINE, 186 CPUHP_AP_RCUTREE_ONLINE, 187 CPUHP_AP_BASE_CACHEINFO_ONLINE, 188 CPUHP_AP_ONLINE_DYN, 189 CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30, 190 CPUHP_AP_X86_HPET_ONLINE, 191 CPUHP_AP_X86_KVM_CLK_ONLINE, 192 CPUHP_AP_ACTIVE, 193 CPUHP_ONLINE, 194 }; 195 196 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke, 197 int (*startup)(unsigned int cpu), 198 int (*teardown)(unsigned int cpu), bool multi_instance); 199 200 int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name, 201 bool invoke, 202 int (*startup)(unsigned int cpu), 203 int (*teardown)(unsigned int cpu), 204 bool multi_instance); 205 /** 206 * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks 207 * @state: The state for which the calls are installed 208 * @name: Name of the callback (will be used in debug output) 209 * @startup: startup callback function 210 * @teardown: teardown callback function 211 * 212 * Installs the callback functions and invokes the startup callback on 213 * the present cpus which have already reached the @state. 214 */ 215 static inline int cpuhp_setup_state(enum cpuhp_state state, 216 const char *name, 217 int (*startup)(unsigned int cpu), 218 int (*teardown)(unsigned int cpu)) 219 { 220 return __cpuhp_setup_state(state, name, true, startup, teardown, false); 221 } 222 223 static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state, 224 const char *name, 225 int (*startup)(unsigned int cpu), 226 int (*teardown)(unsigned int cpu)) 227 { 228 return __cpuhp_setup_state_cpuslocked(state, name, true, startup, 229 teardown, false); 230 } 231 232 /** 233 * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the 234 * callbacks 235 * @state: The state for which the calls are installed 236 * @name: Name of the callback. 237 * @startup: startup callback function 238 * @teardown: teardown callback function 239 * 240 * Same as @cpuhp_setup_state except that no calls are executed are invoked 241 * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n. 242 */ 243 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state, 244 const char *name, 245 int (*startup)(unsigned int cpu), 246 int (*teardown)(unsigned int cpu)) 247 { 248 return __cpuhp_setup_state(state, name, false, startup, teardown, 249 false); 250 } 251 252 static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state, 253 const char *name, 254 int (*startup)(unsigned int cpu), 255 int (*teardown)(unsigned int cpu)) 256 { 257 return __cpuhp_setup_state_cpuslocked(state, name, false, startup, 258 teardown, false); 259 } 260 261 /** 262 * cpuhp_setup_state_multi - Add callbacks for multi state 263 * @state: The state for which the calls are installed 264 * @name: Name of the callback. 265 * @startup: startup callback function 266 * @teardown: teardown callback function 267 * 268 * Sets the internal multi_instance flag and prepares a state to work as a multi 269 * instance callback. No callbacks are invoked at this point. The callbacks are 270 * invoked once an instance for this state are registered via 271 * @cpuhp_state_add_instance or @cpuhp_state_add_instance_nocalls. 272 */ 273 static inline int cpuhp_setup_state_multi(enum cpuhp_state state, 274 const char *name, 275 int (*startup)(unsigned int cpu, 276 struct hlist_node *node), 277 int (*teardown)(unsigned int cpu, 278 struct hlist_node *node)) 279 { 280 return __cpuhp_setup_state(state, name, false, 281 (void *) startup, 282 (void *) teardown, true); 283 } 284 285 int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node, 286 bool invoke); 287 int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state, 288 struct hlist_node *node, bool invoke); 289 290 /** 291 * cpuhp_state_add_instance - Add an instance for a state and invoke startup 292 * callback. 293 * @state: The state for which the instance is installed 294 * @node: The node for this individual state. 295 * 296 * Installs the instance for the @state and invokes the startup callback on 297 * the present cpus which have already reached the @state. The @state must have 298 * been earlier marked as multi-instance by @cpuhp_setup_state_multi. 299 */ 300 static inline int cpuhp_state_add_instance(enum cpuhp_state state, 301 struct hlist_node *node) 302 { 303 return __cpuhp_state_add_instance(state, node, true); 304 } 305 306 /** 307 * cpuhp_state_add_instance_nocalls - Add an instance for a state without 308 * invoking the startup callback. 309 * @state: The state for which the instance is installed 310 * @node: The node for this individual state. 311 * 312 * Installs the instance for the @state The @state must have been earlier 313 * marked as multi-instance by @cpuhp_setup_state_multi. 314 */ 315 static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state, 316 struct hlist_node *node) 317 { 318 return __cpuhp_state_add_instance(state, node, false); 319 } 320 321 static inline int 322 cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state, 323 struct hlist_node *node) 324 { 325 return __cpuhp_state_add_instance_cpuslocked(state, node, false); 326 } 327 328 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke); 329 void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke); 330 331 /** 332 * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown 333 * @state: The state for which the calls are removed 334 * 335 * Removes the callback functions and invokes the teardown callback on 336 * the present cpus which have already reached the @state. 337 */ 338 static inline void cpuhp_remove_state(enum cpuhp_state state) 339 { 340 __cpuhp_remove_state(state, true); 341 } 342 343 /** 344 * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking 345 * teardown 346 * @state: The state for which the calls are removed 347 */ 348 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state) 349 { 350 __cpuhp_remove_state(state, false); 351 } 352 353 static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state) 354 { 355 __cpuhp_remove_state_cpuslocked(state, false); 356 } 357 358 /** 359 * cpuhp_remove_multi_state - Remove hotplug multi state callback 360 * @state: The state for which the calls are removed 361 * 362 * Removes the callback functions from a multi state. This is the reverse of 363 * cpuhp_setup_state_multi(). All instances should have been removed before 364 * invoking this function. 365 */ 366 static inline void cpuhp_remove_multi_state(enum cpuhp_state state) 367 { 368 __cpuhp_remove_state(state, false); 369 } 370 371 int __cpuhp_state_remove_instance(enum cpuhp_state state, 372 struct hlist_node *node, bool invoke); 373 374 /** 375 * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke 376 * the teardown callback 377 * @state: The state from which the instance is removed 378 * @node: The node for this individual state. 379 * 380 * Removes the instance and invokes the teardown callback on the present cpus 381 * which have already reached the @state. 382 */ 383 static inline int cpuhp_state_remove_instance(enum cpuhp_state state, 384 struct hlist_node *node) 385 { 386 return __cpuhp_state_remove_instance(state, node, true); 387 } 388 389 /** 390 * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state 391 * without invoking the reatdown callback 392 * @state: The state from which the instance is removed 393 * @node: The node for this individual state. 394 * 395 * Removes the instance without invoking the teardown callback. 396 */ 397 static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state, 398 struct hlist_node *node) 399 { 400 return __cpuhp_state_remove_instance(state, node, false); 401 } 402 403 #ifdef CONFIG_SMP 404 void cpuhp_online_idle(enum cpuhp_state state); 405 #else 406 static inline void cpuhp_online_idle(enum cpuhp_state state) { } 407 #endif 408 409 #endif 410