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_DEBUG_OBJ_DEAD, 40 CPUHP_MM_WRITEBACK_DEAD, 41 CPUHP_MM_VMSTAT_DEAD, 42 CPUHP_SOFTIRQ_DEAD, 43 CPUHP_NET_MVNETA_DEAD, 44 CPUHP_CPUIDLE_DEAD, 45 CPUHP_ARM64_FPSIMD_DEAD, 46 CPUHP_ARM_OMAP_WAKE_DEAD, 47 CPUHP_IRQ_POLL_DEAD, 48 CPUHP_BLOCK_SOFTIRQ_DEAD, 49 CPUHP_ACPI_CPUDRV_DEAD, 50 CPUHP_S390_PFAULT_DEAD, 51 CPUHP_BLK_MQ_DEAD, 52 CPUHP_FS_BUFF_DEAD, 53 CPUHP_PRINTK_DEAD, 54 CPUHP_MM_MEMCQ_DEAD, 55 CPUHP_PERCPU_CNT_DEAD, 56 CPUHP_RADIX_DEAD, 57 CPUHP_PAGE_ALLOC_DEAD, 58 CPUHP_NET_DEV_DEAD, 59 CPUHP_PCI_XGENE_DEAD, 60 CPUHP_IOMMU_INTEL_DEAD, 61 CPUHP_LUSTRE_CFS_DEAD, 62 CPUHP_AP_ARM_CACHE_B15_RAC_DEAD, 63 CPUHP_PADATA_DEAD, 64 CPUHP_WORKQUEUE_PREP, 65 CPUHP_POWER_NUMA_PREPARE, 66 CPUHP_HRTIMERS_PREPARE, 67 CPUHP_PROFILE_PREPARE, 68 CPUHP_X2APIC_PREPARE, 69 CPUHP_SMPCFD_PREPARE, 70 CPUHP_RELAY_PREPARE, 71 CPUHP_SLAB_PREPARE, 72 CPUHP_MD_RAID5_PREPARE, 73 CPUHP_RCUTREE_PREP, 74 CPUHP_CPUIDLE_COUPLED_PREPARE, 75 CPUHP_POWERPC_PMAC_PREPARE, 76 CPUHP_POWERPC_MMU_CTX_PREPARE, 77 CPUHP_XEN_PREPARE, 78 CPUHP_XEN_EVTCHN_PREPARE, 79 CPUHP_ARM_SHMOBILE_SCU_PREPARE, 80 CPUHP_SH_SH3X_PREPARE, 81 CPUHP_NET_FLOW_PREPARE, 82 CPUHP_TOPOLOGY_PREPARE, 83 CPUHP_NET_IUCV_PREPARE, 84 CPUHP_ARM_BL_PREPARE, 85 CPUHP_TRACE_RB_PREPARE, 86 CPUHP_MM_ZS_PREPARE, 87 CPUHP_MM_ZSWP_MEM_PREPARE, 88 CPUHP_MM_ZSWP_POOL_PREPARE, 89 CPUHP_KVM_PPC_BOOK3S_PREPARE, 90 CPUHP_ZCOMP_PREPARE, 91 CPUHP_TIMERS_PREPARE, 92 CPUHP_MIPS_SOC_PREPARE, 93 CPUHP_BP_PREPARE_DYN, 94 CPUHP_BP_PREPARE_DYN_END = CPUHP_BP_PREPARE_DYN + 20, 95 CPUHP_BRINGUP_CPU, 96 CPUHP_AP_IDLE_DEAD, 97 CPUHP_AP_OFFLINE, 98 CPUHP_AP_SCHED_STARTING, 99 CPUHP_AP_RCUTREE_DYING, 100 CPUHP_AP_CPU_PM_STARTING, 101 CPUHP_AP_IRQ_GIC_STARTING, 102 CPUHP_AP_IRQ_HIP04_STARTING, 103 CPUHP_AP_IRQ_ARMADA_XP_STARTING, 104 CPUHP_AP_IRQ_BCM2836_STARTING, 105 CPUHP_AP_IRQ_MIPS_GIC_STARTING, 106 CPUHP_AP_IRQ_RISCV_STARTING, 107 CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING, 108 CPUHP_AP_ARM_MVEBU_COHERENCY, 109 CPUHP_AP_MICROCODE_LOADER, 110 CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING, 111 CPUHP_AP_PERF_X86_STARTING, 112 CPUHP_AP_PERF_X86_AMD_IBS_STARTING, 113 CPUHP_AP_PERF_X86_CQM_STARTING, 114 CPUHP_AP_PERF_X86_CSTATE_STARTING, 115 CPUHP_AP_PERF_XTENSA_STARTING, 116 CPUHP_AP_MIPS_OP_LOONGSON3_STARTING, 117 CPUHP_AP_ARM_SDEI_STARTING, 118 CPUHP_AP_ARM_VFP_STARTING, 119 CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING, 120 CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING, 121 CPUHP_AP_PERF_ARM_ACPI_STARTING, 122 CPUHP_AP_PERF_ARM_STARTING, 123 CPUHP_AP_ARM_L2X0_STARTING, 124 CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING, 125 CPUHP_AP_ARM_ARCH_TIMER_STARTING, 126 CPUHP_AP_ARM_GLOBAL_TIMER_STARTING, 127 CPUHP_AP_JCORE_TIMER_STARTING, 128 CPUHP_AP_ARM_TWD_STARTING, 129 CPUHP_AP_QCOM_TIMER_STARTING, 130 CPUHP_AP_TEGRA_TIMER_STARTING, 131 CPUHP_AP_ARMADA_TIMER_STARTING, 132 CPUHP_AP_MARCO_TIMER_STARTING, 133 CPUHP_AP_MIPS_GIC_TIMER_STARTING, 134 CPUHP_AP_ARC_TIMER_STARTING, 135 CPUHP_AP_RISCV_TIMER_STARTING, 136 CPUHP_AP_CLINT_TIMER_STARTING, 137 CPUHP_AP_CSKY_TIMER_STARTING, 138 CPUHP_AP_HYPERV_TIMER_STARTING, 139 CPUHP_AP_KVM_STARTING, 140 CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING, 141 CPUHP_AP_KVM_ARM_VGIC_STARTING, 142 CPUHP_AP_KVM_ARM_TIMER_STARTING, 143 /* Must be the last timer callback */ 144 CPUHP_AP_DUMMY_TIMER_STARTING, 145 CPUHP_AP_ARM_XEN_STARTING, 146 CPUHP_AP_ARM_CORESIGHT_STARTING, 147 CPUHP_AP_ARM_CORESIGHT_CTI_STARTING, 148 CPUHP_AP_ARM64_ISNDEP_STARTING, 149 CPUHP_AP_SMPCFD_DYING, 150 CPUHP_AP_X86_TBOOT_DYING, 151 CPUHP_AP_ARM_CACHE_B15_RAC_DYING, 152 CPUHP_AP_ONLINE, 153 CPUHP_TEARDOWN_CPU, 154 CPUHP_AP_ONLINE_IDLE, 155 CPUHP_AP_SMPBOOT_THREADS, 156 CPUHP_AP_X86_VDSO_VMA_ONLINE, 157 CPUHP_AP_IRQ_AFFINITY_ONLINE, 158 CPUHP_AP_BLK_MQ_ONLINE, 159 CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS, 160 CPUHP_AP_X86_INTEL_EPB_ONLINE, 161 CPUHP_AP_PERF_ONLINE, 162 CPUHP_AP_PERF_X86_ONLINE, 163 CPUHP_AP_PERF_X86_UNCORE_ONLINE, 164 CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE, 165 CPUHP_AP_PERF_X86_AMD_POWER_ONLINE, 166 CPUHP_AP_PERF_X86_RAPL_ONLINE, 167 CPUHP_AP_PERF_X86_CQM_ONLINE, 168 CPUHP_AP_PERF_X86_CSTATE_ONLINE, 169 CPUHP_AP_PERF_S390_CF_ONLINE, 170 CPUHP_AP_PERF_S390_SF_ONLINE, 171 CPUHP_AP_PERF_ARM_CCI_ONLINE, 172 CPUHP_AP_PERF_ARM_CCN_ONLINE, 173 CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE, 174 CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE, 175 CPUHP_AP_PERF_ARM_HISI_L3_ONLINE, 176 CPUHP_AP_PERF_ARM_L2X0_ONLINE, 177 CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE, 178 CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE, 179 CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE, 180 CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE, 181 CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE, 182 CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE, 183 CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE, 184 CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE, 185 CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE, 186 CPUHP_AP_WATCHDOG_ONLINE, 187 CPUHP_AP_WORKQUEUE_ONLINE, 188 CPUHP_AP_RCUTREE_ONLINE, 189 CPUHP_AP_BASE_CACHEINFO_ONLINE, 190 CPUHP_AP_ONLINE_DYN, 191 CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30, 192 CPUHP_AP_X86_HPET_ONLINE, 193 CPUHP_AP_X86_KVM_CLK_ONLINE, 194 CPUHP_AP_ACTIVE, 195 CPUHP_ONLINE, 196 }; 197 198 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke, 199 int (*startup)(unsigned int cpu), 200 int (*teardown)(unsigned int cpu), bool multi_instance); 201 202 int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name, 203 bool invoke, 204 int (*startup)(unsigned int cpu), 205 int (*teardown)(unsigned int cpu), 206 bool multi_instance); 207 /** 208 * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks 209 * @state: The state for which the calls are installed 210 * @name: Name of the callback (will be used in debug output) 211 * @startup: startup callback function 212 * @teardown: teardown callback function 213 * 214 * Installs the callback functions and invokes the startup callback on 215 * the present cpus which have already reached the @state. 216 */ 217 static inline int cpuhp_setup_state(enum cpuhp_state state, 218 const char *name, 219 int (*startup)(unsigned int cpu), 220 int (*teardown)(unsigned int cpu)) 221 { 222 return __cpuhp_setup_state(state, name, true, startup, teardown, false); 223 } 224 225 static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state, 226 const char *name, 227 int (*startup)(unsigned int cpu), 228 int (*teardown)(unsigned int cpu)) 229 { 230 return __cpuhp_setup_state_cpuslocked(state, name, true, startup, 231 teardown, false); 232 } 233 234 /** 235 * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the 236 * callbacks 237 * @state: The state for which the calls are installed 238 * @name: Name of the callback. 239 * @startup: startup callback function 240 * @teardown: teardown callback function 241 * 242 * Same as @cpuhp_setup_state except that no calls are executed are invoked 243 * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n. 244 */ 245 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state, 246 const char *name, 247 int (*startup)(unsigned int cpu), 248 int (*teardown)(unsigned int cpu)) 249 { 250 return __cpuhp_setup_state(state, name, false, startup, teardown, 251 false); 252 } 253 254 static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state, 255 const char *name, 256 int (*startup)(unsigned int cpu), 257 int (*teardown)(unsigned int cpu)) 258 { 259 return __cpuhp_setup_state_cpuslocked(state, name, false, startup, 260 teardown, false); 261 } 262 263 /** 264 * cpuhp_setup_state_multi - Add callbacks for multi state 265 * @state: The state for which the calls are installed 266 * @name: Name of the callback. 267 * @startup: startup callback function 268 * @teardown: teardown callback function 269 * 270 * Sets the internal multi_instance flag and prepares a state to work as a multi 271 * instance callback. No callbacks are invoked at this point. The callbacks are 272 * invoked once an instance for this state are registered via 273 * @cpuhp_state_add_instance or @cpuhp_state_add_instance_nocalls. 274 */ 275 static inline int cpuhp_setup_state_multi(enum cpuhp_state state, 276 const char *name, 277 int (*startup)(unsigned int cpu, 278 struct hlist_node *node), 279 int (*teardown)(unsigned int cpu, 280 struct hlist_node *node)) 281 { 282 return __cpuhp_setup_state(state, name, false, 283 (void *) startup, 284 (void *) teardown, true); 285 } 286 287 int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node, 288 bool invoke); 289 int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state, 290 struct hlist_node *node, bool invoke); 291 292 /** 293 * cpuhp_state_add_instance - Add an instance for a state and invoke startup 294 * callback. 295 * @state: The state for which the instance is installed 296 * @node: The node for this individual state. 297 * 298 * Installs the instance for the @state and invokes the startup callback on 299 * the present cpus which have already reached the @state. The @state must have 300 * been earlier marked as multi-instance by @cpuhp_setup_state_multi. 301 */ 302 static inline int cpuhp_state_add_instance(enum cpuhp_state state, 303 struct hlist_node *node) 304 { 305 return __cpuhp_state_add_instance(state, node, true); 306 } 307 308 /** 309 * cpuhp_state_add_instance_nocalls - Add an instance for a state without 310 * invoking the startup callback. 311 * @state: The state for which the instance is installed 312 * @node: The node for this individual state. 313 * 314 * Installs the instance for the @state The @state must have been earlier 315 * marked as multi-instance by @cpuhp_setup_state_multi. 316 */ 317 static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state, 318 struct hlist_node *node) 319 { 320 return __cpuhp_state_add_instance(state, node, false); 321 } 322 323 static inline int 324 cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state, 325 struct hlist_node *node) 326 { 327 return __cpuhp_state_add_instance_cpuslocked(state, node, false); 328 } 329 330 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke); 331 void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke); 332 333 /** 334 * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown 335 * @state: The state for which the calls are removed 336 * 337 * Removes the callback functions and invokes the teardown callback on 338 * the present cpus which have already reached the @state. 339 */ 340 static inline void cpuhp_remove_state(enum cpuhp_state state) 341 { 342 __cpuhp_remove_state(state, true); 343 } 344 345 /** 346 * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking 347 * teardown 348 * @state: The state for which the calls are removed 349 */ 350 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state) 351 { 352 __cpuhp_remove_state(state, false); 353 } 354 355 static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state) 356 { 357 __cpuhp_remove_state_cpuslocked(state, false); 358 } 359 360 /** 361 * cpuhp_remove_multi_state - Remove hotplug multi state callback 362 * @state: The state for which the calls are removed 363 * 364 * Removes the callback functions from a multi state. This is the reverse of 365 * cpuhp_setup_state_multi(). All instances should have been removed before 366 * invoking this function. 367 */ 368 static inline void cpuhp_remove_multi_state(enum cpuhp_state state) 369 { 370 __cpuhp_remove_state(state, false); 371 } 372 373 int __cpuhp_state_remove_instance(enum cpuhp_state state, 374 struct hlist_node *node, bool invoke); 375 376 /** 377 * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke 378 * the teardown callback 379 * @state: The state from which the instance is removed 380 * @node: The node for this individual state. 381 * 382 * Removes the instance and invokes the teardown callback on the present cpus 383 * which have already reached the @state. 384 */ 385 static inline int cpuhp_state_remove_instance(enum cpuhp_state state, 386 struct hlist_node *node) 387 { 388 return __cpuhp_state_remove_instance(state, node, true); 389 } 390 391 /** 392 * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state 393 * without invoking the reatdown callback 394 * @state: The state from which the instance is removed 395 * @node: The node for this individual state. 396 * 397 * Removes the instance without invoking the teardown callback. 398 */ 399 static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state, 400 struct hlist_node *node) 401 { 402 return __cpuhp_state_remove_instance(state, node, false); 403 } 404 405 #ifdef CONFIG_SMP 406 void cpuhp_online_idle(enum cpuhp_state state); 407 #else 408 static inline void cpuhp_online_idle(enum cpuhp_state state) { } 409 #endif 410 411 #endif 412