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_ARM_MVEBU_COHERENCY, 106 CPUHP_AP_MICROCODE_LOADER, 107 CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING, 108 CPUHP_AP_PERF_X86_STARTING, 109 CPUHP_AP_PERF_X86_AMD_IBS_STARTING, 110 CPUHP_AP_PERF_X86_CQM_STARTING, 111 CPUHP_AP_PERF_X86_CSTATE_STARTING, 112 CPUHP_AP_PERF_XTENSA_STARTING, 113 CPUHP_AP_MIPS_OP_LOONGSON3_STARTING, 114 CPUHP_AP_ARM_SDEI_STARTING, 115 CPUHP_AP_ARM_VFP_STARTING, 116 CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING, 117 CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING, 118 CPUHP_AP_PERF_ARM_ACPI_STARTING, 119 CPUHP_AP_PERF_ARM_STARTING, 120 CPUHP_AP_ARM_L2X0_STARTING, 121 CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING, 122 CPUHP_AP_ARM_ARCH_TIMER_STARTING, 123 CPUHP_AP_ARM_GLOBAL_TIMER_STARTING, 124 CPUHP_AP_JCORE_TIMER_STARTING, 125 CPUHP_AP_ARM_TWD_STARTING, 126 CPUHP_AP_QCOM_TIMER_STARTING, 127 CPUHP_AP_TEGRA_TIMER_STARTING, 128 CPUHP_AP_ARMADA_TIMER_STARTING, 129 CPUHP_AP_MARCO_TIMER_STARTING, 130 CPUHP_AP_MIPS_GIC_TIMER_STARTING, 131 CPUHP_AP_ARC_TIMER_STARTING, 132 CPUHP_AP_RISCV_TIMER_STARTING, 133 CPUHP_AP_CSKY_TIMER_STARTING, 134 CPUHP_AP_HYPERV_TIMER_STARTING, 135 CPUHP_AP_KVM_STARTING, 136 CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING, 137 CPUHP_AP_KVM_ARM_VGIC_STARTING, 138 CPUHP_AP_KVM_ARM_TIMER_STARTING, 139 /* Must be the last timer callback */ 140 CPUHP_AP_DUMMY_TIMER_STARTING, 141 CPUHP_AP_ARM_XEN_STARTING, 142 CPUHP_AP_ARM_KVMPV_STARTING, 143 CPUHP_AP_ARM_CORESIGHT_STARTING, 144 CPUHP_AP_ARM64_ISNDEP_STARTING, 145 CPUHP_AP_SMPCFD_DYING, 146 CPUHP_AP_X86_TBOOT_DYING, 147 CPUHP_AP_ARM_CACHE_B15_RAC_DYING, 148 CPUHP_AP_ONLINE, 149 CPUHP_TEARDOWN_CPU, 150 CPUHP_AP_ONLINE_IDLE, 151 CPUHP_AP_SMPBOOT_THREADS, 152 CPUHP_AP_X86_VDSO_VMA_ONLINE, 153 CPUHP_AP_IRQ_AFFINITY_ONLINE, 154 CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS, 155 CPUHP_AP_X86_INTEL_EPB_ONLINE, 156 CPUHP_AP_PERF_ONLINE, 157 CPUHP_AP_PERF_X86_ONLINE, 158 CPUHP_AP_PERF_X86_UNCORE_ONLINE, 159 CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE, 160 CPUHP_AP_PERF_X86_AMD_POWER_ONLINE, 161 CPUHP_AP_PERF_X86_RAPL_ONLINE, 162 CPUHP_AP_PERF_X86_CQM_ONLINE, 163 CPUHP_AP_PERF_X86_CSTATE_ONLINE, 164 CPUHP_AP_PERF_S390_CF_ONLINE, 165 CPUHP_AP_PERF_S390_SF_ONLINE, 166 CPUHP_AP_PERF_ARM_CCI_ONLINE, 167 CPUHP_AP_PERF_ARM_CCN_ONLINE, 168 CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE, 169 CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE, 170 CPUHP_AP_PERF_ARM_HISI_L3_ONLINE, 171 CPUHP_AP_PERF_ARM_L2X0_ONLINE, 172 CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE, 173 CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE, 174 CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE, 175 CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE, 176 CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE, 177 CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE, 178 CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE, 179 CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE, 180 CPUHP_AP_WATCHDOG_ONLINE, 181 CPUHP_AP_WORKQUEUE_ONLINE, 182 CPUHP_AP_RCUTREE_ONLINE, 183 CPUHP_AP_BASE_CACHEINFO_ONLINE, 184 CPUHP_AP_ONLINE_DYN, 185 CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30, 186 CPUHP_AP_X86_HPET_ONLINE, 187 CPUHP_AP_X86_KVM_CLK_ONLINE, 188 CPUHP_AP_ACTIVE, 189 CPUHP_ONLINE, 190 }; 191 192 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke, 193 int (*startup)(unsigned int cpu), 194 int (*teardown)(unsigned int cpu), bool multi_instance); 195 196 int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name, 197 bool invoke, 198 int (*startup)(unsigned int cpu), 199 int (*teardown)(unsigned int cpu), 200 bool multi_instance); 201 /** 202 * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks 203 * @state: The state for which the calls are installed 204 * @name: Name of the callback (will be used in debug output) 205 * @startup: startup callback function 206 * @teardown: teardown callback function 207 * 208 * Installs the callback functions and invokes the startup callback on 209 * the present cpus which have already reached the @state. 210 */ 211 static inline int cpuhp_setup_state(enum cpuhp_state state, 212 const char *name, 213 int (*startup)(unsigned int cpu), 214 int (*teardown)(unsigned int cpu)) 215 { 216 return __cpuhp_setup_state(state, name, true, startup, teardown, false); 217 } 218 219 static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state, 220 const char *name, 221 int (*startup)(unsigned int cpu), 222 int (*teardown)(unsigned int cpu)) 223 { 224 return __cpuhp_setup_state_cpuslocked(state, name, true, startup, 225 teardown, false); 226 } 227 228 /** 229 * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the 230 * callbacks 231 * @state: The state for which the calls are installed 232 * @name: Name of the callback. 233 * @startup: startup callback function 234 * @teardown: teardown callback function 235 * 236 * Same as @cpuhp_setup_state except that no calls are executed are invoked 237 * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n. 238 */ 239 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state, 240 const char *name, 241 int (*startup)(unsigned int cpu), 242 int (*teardown)(unsigned int cpu)) 243 { 244 return __cpuhp_setup_state(state, name, false, startup, teardown, 245 false); 246 } 247 248 static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state, 249 const char *name, 250 int (*startup)(unsigned int cpu), 251 int (*teardown)(unsigned int cpu)) 252 { 253 return __cpuhp_setup_state_cpuslocked(state, name, false, startup, 254 teardown, false); 255 } 256 257 /** 258 * cpuhp_setup_state_multi - Add callbacks for multi state 259 * @state: The state for which the calls are installed 260 * @name: Name of the callback. 261 * @startup: startup callback function 262 * @teardown: teardown callback function 263 * 264 * Sets the internal multi_instance flag and prepares a state to work as a multi 265 * instance callback. No callbacks are invoked at this point. The callbacks are 266 * invoked once an instance for this state are registered via 267 * @cpuhp_state_add_instance or @cpuhp_state_add_instance_nocalls. 268 */ 269 static inline int cpuhp_setup_state_multi(enum cpuhp_state state, 270 const char *name, 271 int (*startup)(unsigned int cpu, 272 struct hlist_node *node), 273 int (*teardown)(unsigned int cpu, 274 struct hlist_node *node)) 275 { 276 return __cpuhp_setup_state(state, name, false, 277 (void *) startup, 278 (void *) teardown, true); 279 } 280 281 int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node, 282 bool invoke); 283 int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state, 284 struct hlist_node *node, bool invoke); 285 286 /** 287 * cpuhp_state_add_instance - Add an instance for a state and invoke startup 288 * callback. 289 * @state: The state for which the instance is installed 290 * @node: The node for this individual state. 291 * 292 * Installs the instance for the @state and invokes the startup callback on 293 * the present cpus which have already reached the @state. The @state must have 294 * been earlier marked as multi-instance by @cpuhp_setup_state_multi. 295 */ 296 static inline int cpuhp_state_add_instance(enum cpuhp_state state, 297 struct hlist_node *node) 298 { 299 return __cpuhp_state_add_instance(state, node, true); 300 } 301 302 /** 303 * cpuhp_state_add_instance_nocalls - Add an instance for a state without 304 * invoking the startup callback. 305 * @state: The state for which the instance is installed 306 * @node: The node for this individual state. 307 * 308 * Installs the instance for the @state The @state must have been earlier 309 * marked as multi-instance by @cpuhp_setup_state_multi. 310 */ 311 static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state, 312 struct hlist_node *node) 313 { 314 return __cpuhp_state_add_instance(state, node, false); 315 } 316 317 static inline int 318 cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state, 319 struct hlist_node *node) 320 { 321 return __cpuhp_state_add_instance_cpuslocked(state, node, false); 322 } 323 324 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke); 325 void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke); 326 327 /** 328 * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown 329 * @state: The state for which the calls are removed 330 * 331 * Removes the callback functions and invokes the teardown callback on 332 * the present cpus which have already reached the @state. 333 */ 334 static inline void cpuhp_remove_state(enum cpuhp_state state) 335 { 336 __cpuhp_remove_state(state, true); 337 } 338 339 /** 340 * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking 341 * teardown 342 * @state: The state for which the calls are removed 343 */ 344 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state) 345 { 346 __cpuhp_remove_state(state, false); 347 } 348 349 static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state) 350 { 351 __cpuhp_remove_state_cpuslocked(state, false); 352 } 353 354 /** 355 * cpuhp_remove_multi_state - Remove hotplug multi state callback 356 * @state: The state for which the calls are removed 357 * 358 * Removes the callback functions from a multi state. This is the reverse of 359 * cpuhp_setup_state_multi(). All instances should have been removed before 360 * invoking this function. 361 */ 362 static inline void cpuhp_remove_multi_state(enum cpuhp_state state) 363 { 364 __cpuhp_remove_state(state, false); 365 } 366 367 int __cpuhp_state_remove_instance(enum cpuhp_state state, 368 struct hlist_node *node, bool invoke); 369 370 /** 371 * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke 372 * the teardown callback 373 * @state: The state from which the instance is removed 374 * @node: The node for this individual state. 375 * 376 * Removes the instance and invokes the teardown callback on the present cpus 377 * which have already reached the @state. 378 */ 379 static inline int cpuhp_state_remove_instance(enum cpuhp_state state, 380 struct hlist_node *node) 381 { 382 return __cpuhp_state_remove_instance(state, node, true); 383 } 384 385 /** 386 * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state 387 * without invoking the reatdown callback 388 * @state: The state from which the instance is removed 389 * @node: The node for this individual state. 390 * 391 * Removes the instance without invoking the teardown callback. 392 */ 393 static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state, 394 struct hlist_node *node) 395 { 396 return __cpuhp_state_remove_instance(state, node, false); 397 } 398 399 #ifdef CONFIG_SMP 400 void cpuhp_online_idle(enum cpuhp_state state); 401 #else 402 static inline void cpuhp_online_idle(enum cpuhp_state state) { } 403 #endif 404 405 #endif 406